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Understanding Fault Characteristics of Inverter-Based Distributed Energy Resources
Keller, J.; Kroposki, B.
This report discusses issues and provides solutions for dealing with fault current contributions from inverter-based distributed energy resources.
Understanding Fault Characteristics And Sediment Depth For Geothermal...
of primarily E-W directed extension along N-NNW striking normal faults. Water well drilling on the eastern slopes of the Wassuk Range, west of the city of Hawthorne, Nevada...
Selected growth and interaction characteristics of seafloor faults in the central Mississippi Canyon Offshore Continental Shelf (OCS) area, northern Gulf of Mexico
Wegner, Scott Ashley
The characteristics of some shallow faults in the Gulf of Mexico interpreted to be active are poorly understood. A better understanding of these faults will increase our understanding of formerly and presently active geologic processes in the Gulf...
Evaluation of faulting characteristics and ground acceleration associated with recent movement along the Meers Fault, Southwestern Oklahoma
Burrell, Richard Dennis
Recent studies have shown that a 27 km section of the Meers Fault was reactivated during Holocene time. Although these studies have proven the occurrence of recent fault activity, many basic characteristics of the faulting remain unresolved...
Characteristics of Wind Turbines Under Normal and Fault Conditions: Preprint
Muljadi, E.; Butterfield, C. P.; Parsons, B.; Ellis, A.
This paper investigates the characteristics of a variable-speed wind turbine connected to a stiff or weak grid under normal and fault conditions and the role of reactive power compensation.
Frictional characteristics of serpentinite from the Motagua fault zone in Guatemala: an experimental studyĀ
Dengo, Carlos Arturo
of the requirement for the degree of MASTER OF SCIENCE December 1978 Mad or Subjec' . " Geology FRICTIONAL CHARACTERISTIC OF SERPENTINITF. FRON THE I", OTAGUA FAULT ZONE Ili GUATENALA: AN EXPERIMENTAL STUDY A Thesis by CARLOS ARTURO DFNGO App", oved... strike-slip, seismogenic faults warrants a systematic i nvesti ga tion to determine ho v it". frictional characteristics may afreet slip along the fault. Five locations aiong the fault zone were sampled to investigate the sliding !rode as a function...
Understanding Fault Characteristics And Sediment Depth For Geothermal
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Characteristics of displacement transfer zones associated with thrust faults / by Arthur Francis Xavier O'KeefeĀ
O'Keefe, Arthur Francis Xavier
CHARAC 'ERZSTZCS OF DZSPLACENENT TRANSFER 'ZONES ASSOCIATED WI H THRUST FAULTS A Thesis by ARTHUR FRANCIS XAVIER O&HEEFE Submitted to the Graduate College of Texas AlkM University in partial fulfillment of the requirement for the degree... of NASTER OF SCIENCE August 1990 Idaho or Subrent: Geology CHARACTERISTICS QF DISPLACEMENT TRANSFER ZONES ASSOCIATED NITS THRUST FAULTS A Thesis by ARTHUR FRANCIS XAVIER 0 'KEEFE Approved ss to style and content by: (Co-chairman of' Commi. tee...
The characteristics of arcing faults in 480-volt power distribution systems
Shih, Yu?
December 1994 Major Subject: Electrical Engineering THE CHARACTERISTICS OF ARCING FAULTS IN 480-VOLT POWER DISTRIBUTION SYSTEMS A Thesis by YU SHI Submitted to Texas ARM University in partial fulfillment of the requirements for the degree... of MASTER OF SCIENCE Approved as to style and content by: B. Don Russell (Chair of Committee) . M. Hua g (Member) , 24 . Yurt (Member) M. Kezunovic (Member) A. D. Patton (Head of Department) December 1994 Major Subject; Electrical Engineering...
Evaluation of faulting characteristics and ground acceleration associated with recent movement along the Meers Fault, Southwestern OklahomaĀ
Burrell, Richard Dennis
Exposures. 14 Diagram illustrating the effects of the Meers Fault scarp on stream channel pathways. 16 Tors on the western side of Elk Mountain, 17 Tors in Wichita Mountains known as Twin Rocks . . . 10 Tor Analysis Log utilized during fteld... and the adjacent petroleum rich Anadarko Basin. Moody and Hill (1956) identified the presence of a scarp along a section of the Meers Fault which deforms Quaternary deposits during a study of wrench fault tectonics. However, it was not until further observations...
A comparison of the characteristic currents method with IEC, ANSI/IEEE, and dynamic simulation procedures for fault calculations
Halpin, S.M. [Mississippi State Univ., MS (United States). Dept. of Electrical and Computer Engineering; Parise, G. [Univ. of Rome La Sapienza (Italy). Electrical Engineering Dept.
Comparisons of fault calculation procedures are presented in this paper. The primary method considered in this paper is the characteristic currents method. This calculation procedure has been discussed at length in previous work. It is the purpose of this work to present the extension of the previous work to the general case and compare results obtained using this method with results obtained with methods designed to follow recognized ANSI/IEEE and IEC Standards. Complete time-domain simulation is used as the basis for these comparisons. Sample calculations for a system containing multiple induction and synchronous machines are provided for demonstration purposes.
Beyond Availability: Towards a Deeper Understanding of Machine Failure Characteristics in Large Distributed Systems
Gibbons, Phillip B.
Beyond Availability: Towards a Deeper Understanding of Machine Failure Characteristics in Large, availability research has reached a point where properties beyond these initial findings become impor- tant for designing highly available distributed systems. Using several case studies, we further show that our design
NU-MineBench: Understanding the Performance and Scalability Characteristics of Data Mining Algorithms
Choudhary, Alok
NU-MineBench: Understanding the Performance and Scalability Characteristics of Data Mining Clara. CA - 95052 firstname.lastname@example.com Abstract Data mining has become one of the most essential and distributed systems have provided abundant venues for improving the performance of data mining algorithms
Characteristics of displacement transfer zones associated with thrust faults / by Arthur Francis Xavier O'Keefe
O'Keefe, Arthur Francis Xavier
back limb fault and then develops into s. drag fold on the underlying plate. The lower thrust dies by losing displacement until it becomes a fore-limb . hrust in a mino" anticline which plunges out under . he higher thrust (Figure 2). drag olo... is compared with two physical models developed by Gardner and Spang (1973). Their fi. st model involves a conical fold in the upper plate of the lowez- thzust with the point of the cone at the termination of the higher thrust . The fold then opens along...
Understanding I/O workload characteristics of a Peta-scale storage system
Kim, Youngjae [ORNL; Gunasekaran, Raghul [ORNL
Understanding workload characteristics is critical for optimizing and improving the performance of current systems and software, and architecting new storage systems based on observed workload patterns. In this paper, we characterize the I/O workloads of scientific applications of one of the world s fastest high performance computing (HPC) storage cluster, Spider, at the Oak Ridge Leadership Computing Facility (OLCF). OLCF flagship petascale simulation platform, Titan, and other large HPC clusters, in total over 250 thousands compute cores, depend on Spider for their I/O needs. We characterize the system utilization, the demands of reads and writes, idle time, storage space utilization, and the distribution of read requests to write requests for the Peta-scale Storage Systems. From this study, we develop synthesized workloads, and we show that the read and write I/O bandwidth usage as well as the inter-arrival time of requests can be modeled as a Pareto distribution. We also study the I/O load imbalance problems using I/O performance data collected from the Spider storage system.
Internal structure of the Kern Canyon Fault, California: a deeply exhumed strike-slip fault
Neal, Leslie Ann
Deformation and mineral alteration adjacent to a 2 km long segment of the Kern Canyon fault near Lake Isabella, California are studied to characterize the internal structure of the fault zone and to understand the development of fault structure...
Microfracture fabric of the Punchbowl fault zone, San Andreas System, California
Wilson, Jennifer Elizabeth
The origin of fault zone structure is not completely understood. On the basis of mechanistic models of faulting, the characteristic internal structure of faults may largely be established early during growth of the fault, or it may develop...
Ronald C. Surdam
An anomalous velocity model was constructed for the Wind River Basin (WRB) based on {approx}2000 mi of 2-D seismic data and 175 sonic logs, for a total of 132,000 velocity/depth profiles. Ten cross sections were constructed through the model coincident with known gas fields. In each cross section, an intense, anomalously slow velocity domain coincided with the gas-productive rock/fluid interval. The anomalous velocity model: (1) Easily isolates gas-charged rock/fluid systems characterized by anomalously slow velocities and water-rich rock/fluid systems characterized by normal velocities; and (2) Delineates the regional velocity inversion surface, which is characterized by steepening of the Ro/depth gradient, a significant increase in capillary displacement pressure, a significant change in formation water composition, and acceleration of the reaction rate of smectite-to-illite diagenesis in mixed-layer clays. Gas chimneys are observed as topographic highs on the regional velocity inversion surface. Beneath the surface are significant fluid-flow compartments, which have a gas-charge in the fluid phase and are isolated from meteoric water recharge. Water-rich domains may occur within regional gas-charged compartments, but are not being recharged from the meteoric water system (i.e., trapped water). The WRB is divided into at least two regionally prominent fluid-flow compartments separated by the velocity inversion surface: a water-dominated upper compartment likely under strong meteoric water drive and a gas-charged, anomalously pressured lower compartment. Judging from cross sections, numerous gas-charged subcompartments occur within the regional compartment. Their geometries and boundaries are controlled by faults and low-permeability rocks. Commercial gas production results when a reservoir interval characterized by enhanced porosity/permeability intersects one of these gas-charged subcompartments. The rock/fluid characteristics of the Rocky Mountain Laramide Basins (RMLB) described in this work determine the potential for significant, relatively unconventional, so-called ''basin-center'' hydrocarbon accumulations. If such accumulations occur, they will be characterized by the following critical attributes: (1) Location beneath a regional velocity inversion surface that typically is associated with low-permeability lithologies; (2) Anomalous pressure, both over- and underpressure, and when, less commonly, they appear to be normally pressured, they are not in contact with the meteoric water system; (3) A significant gas component in the regional multiphase fluid-flow system (water-gas-oil) that occurs beneath the regional velocity inversion surface; (4) Domains of intense gas charge (i.e., high gas saturation) within the regional multiphase fluid-flow system; (5) Compartmentalization of the rock/fluid system to a far greater extent beneath the regional velocity inversion surface than above it (i.e., convection of fluids across the regional velocity inversion surface is reduced or eliminated depending on the nature of the capillary properties of the low-permeability rocks associated with the inversion surface); (6) Commercial gas accumulations occurring at the intersection of reservoir intervals characterized by enhanced porosity and permeability and gas-charged domains; (7) Productive intersections of reservoir intervals and gas-charged domains, which are controlled by the structural, stratigraphic, and diagenetic elements affecting the rock/fluid system; and (8) No apparent meteoric water connection with the gas accumulations and gas columns up to several thousand feet in height. Because some of these critical attributes are not associated with conventional hydrocarbon accumulations, a new set of diagnostic tools are required in order to explore for and exploit these types of gas prospects efficiently and effectively. Some of these new diagnostic tools have been discussed in this report; other have been described elsewhere. In order to maximize risk reduction, it is recommended when exploring for these types of gas accu
Fault Analysis at a Wind Power Plant for One Year of Observation: Preprint
Muljadi, E.; Mills, Z.; Foster, R.; Conto, J.; Ellis, A.
This paper analyzes the fault characteristics observed at a wind power plant, and the behavior of the wind power plant under fault events.
Attal, M., and Lav, 2006, Changes of bedload characteristics along the Marsyandi River (central Nepal): Implications for understanding hillslope sediment supply, sediment load evolution along fluvial networks, and denudation in active orogenic belts, in W
(central Nepal): Implications for understanding hillslope sediment supply, sediment load evolution along of bedload characteristics along the Marsyandi River (central Nepal): Implications for understanding (Himalayas of central Nepal), and also in sediment source material from hillslopes (landslides, moraines
Understanding peculiarities in the optoelectronic characteristics of light emitting diodes based on (In,Ga)N/GaN nanowires
Musolino, M., E-mail: firstname.lastname@example.com; Tahraoui, A.; Limbach, F.; Lõhnemann, J.; Jahn, U.; Brandt, O.; Geelhaar, L.; Riechert, H. [Paul-Drude-Institut f³r Festk÷rperelektronik, Hausvogteiplatz 5¢7, D-10117 Berlin (Germany)
We investigate the effect of the p-type top contact on the optoelectronic characteristics of light emitting diodes (LEDs) based on (In,Ga)N/GaN nanowire (NW) ensembles grown by molecular beam epitaxy on Si substrates. We compare devices fabricated with either Ni/Au or indium tin oxide (ITO) top contact. The NW-LEDs with ITO exhibit a number density of NWs emitting electroluminescence about ten times higher, significantly lower turn-on voltage and series resistance, and a relative external quantum efficiency more than one order of magnitude higher than the sample with Ni/Au. These results show that limitations in the performance of such devices reported so far can be overcome by improving the p-type top-contact.
Physiochemical Evidence of Faulting Processes and Modeling of Fluid in Evolving Fault Systems in Southern California
Boles, James [Professor
Our study targets recent (Plio-Pleistocene) faults and young (Tertiary) petroleum fields in southern California. Faults include the Refugio Fault in the Transverse Ranges, the Ellwood Fault in the Santa Barbara Channel, and most recently the Newport- Inglewood in the Los Angeles Basin. Subsurface core and tubing scale samples, outcrop samples, well logs, reservoir properties, pore pressures, fluid compositions, and published structural-seismic sections have been used to characterize the tectonic/diagenetic history of the faults. As part of the effort to understand the diagenetic processes within these fault zones, we have studied analogous processes of rapid carbonate precipitation (scaling) in petroleum reservoir tubing and manmade tunnels. From this, we have identified geochemical signatures in carbonate that characterize rapid CO2 degassing. These data provide constraints for finite element models that predict fluid pressures, multiphase flow patterns, rates and patterns of deformation, subsurface temperatures and heat flow, and geochemistry associated with large fault systems.
Experimental characterization of faults on low-voltage systems
Ahmed, Jubayer
was to simulate a con- trolled arcing fault. Hence, the arcgap was maintained constant for a particular test. A tungsten welding rod was used as the electrode because it does not melt easily. This test was performed on a. single-phase system with 240 volts... better understanding of the problem. These arcing faults and high impedance and incipient faults constitute the previously mentioned low-current faults. Journal model is IEEE Transactions on Power Delivery. Although these problems have been...
Numerical modeling of gas migration into and through faulted sand reservoirs in Pabst Field (Main Pass East Block 259), northern Gulf of MexicoĀ
Li, Yuqian
The further exploration and development of Pabst Gas Field with faulted sand reservoirs require an understanding of the properties and roles of faults, particularly Low Throw near Vertical Faults (LTNVFs), in gas migration and accumulation at a...
Numerical modeling of gas migration into and through faulted sand reservoirs in Pabst Field (Main Pass East Block 259), northern Gulf of Mexico
Li, Yuqian
The further exploration and development of Pabst Gas Field with faulted sand reservoirs require an understanding of the properties and roles of faults, particularly Low Throw near Vertical Faults (LTNVFs), in gas migration and accumulation at a...
Photovoltaic ground fault and blind spot electrical simulations.
Flicker, Jack David; Johnson, Jay
Ground faults in photovoltaic (PV) systems pose a fire and shock hazard. To mitigate these risks, AC-isolated, DC grounded PV systems in the United States use Ground Fault Protection Devices (GFPDs), e.g., fuses, to de-energize the PV system when there is a ground fault. Recently the effectiveness of these protection devices has come under question because multiple fires have started when ground faults went undetected. In order to understand the limitations of fuse-based ground fault protection in PV systems, analytical and numerical simulations of different ground faults were performed. The numerical simulations were conducted with Simulation Program with Integrated Circuit Emphasis (SPICE) using a circuit model of the PV system which included the modules, wiring, switchgear, grounded or ungrounded components, and the inverter. The derivation of the SPICE model and the results of parametric fault current studies are provided with varying array topologies, fuse sizes, and fault impedances. Closed-form analytical approximations for GFPD currents from faults to the grounded current carrying conductor-known as %E2%80%9Cblind spot%E2%80%9D ground faults-are derived to provide greater understanding of the influence of array impedances on fault currents. The behavior of the array during various ground faults is studied for a range of ground fault fuse sizes to determine if reducing the size of the fuse improves ground fault detection sensitivity. The results of the simulations show that reducing the amperage rating of the protective fuse does increase fault current detection sensitivity without increasing the likelihood of nuisance trips to a degree. Unfortunately, this benefit reaches a limit as fuses become smaller and their internal resistance increases to the point of becoming a major element in the fault current circuit.
Coordinated Fault Tolerance for High-Performance Computing
Dongarra, Jack; Bosilca, George; et al.
Our work to meet our goal of end-to-end fault tolerance has focused on two areas: (1) improving fault tolerance in various software currently available and widely used throughout the HEC domain and (2) using fault information exchange and coordination to achieve holistic, systemwide fault tolerance and understanding how to design and implement interfaces for integrating fault tolerance features for multiple layers of the software stackŚfrom the application, math libraries, and programming language runtime to other common system software such as jobs schedulers, resource managers, and monitoring tools.
Mechanical Models of Fault-Related Folding
Johnson, A. M.
The subject of the proposed research is fault-related folding and ground deformation. The results are relevant to oil-producing structures throughout the world, to understanding of damage that has been observed along and near earthquake ruptures, and to earthquake-producing structures in California and other tectonically-active areas. The objectives of the proposed research were to provide both a unified, mechanical infrastructure for studies of fault-related foldings and to present the results in computer programs that have graphical users interfaces (GUIs) so that structural geologists and geophysicists can model a wide variety of fault-related folds (FaRFs).
Analysis of the growth of strike-slip faults using effective medium theory
Aydin, A.; Berryman, J.G.
Increases in the dimensions of strike-slip faults including fault length, thickness of fault rock and the surrounding damage zone collectively provide quantitative definition of fault growth and are commonly measured in terms of the maximum fault slip. The field observations indicate that a common mechanism for fault growth in the brittle upper crust is fault lengthening by linkage and coalescence of neighboring fault segments or strands, and fault rock-zone widening into highly fractured inner damage zone via cataclastic deformation. The most important underlying mechanical reason in both cases is prior weakening of the rocks surrounding a fault's core and between neighboring fault segments by faulting-related fractures. In this paper, using field observations together with effective medium models, we analyze the reduction in the effective elastic properties of rock in terms of density of the fault-related brittle fractures and fracture intersection angles controlled primarily by the splay angles. Fracture densities or equivalent fracture spacing values corresponding to the vanishing Young's, shear, and quasi-pure shear moduli were obtained by extrapolation from the calculated range of these parameters. The fracture densities or the equivalent spacing values obtained using this method compare well with the field data measured along scan lines across the faults in the study area. These findings should be helpful for a better understanding of the fracture density/spacing distribution around faults and the transition from discrete fracturing to cataclastic deformation associated with fault growth and the related instabilities.
Fault tolerant pulse synchronizationĀ
Deconda, Keerthi
FFC n=4 orig alg n=4 ft alg n=7 orig alg n=7 ft alg n=10 orig alg n=10 ft alg 24 (a) n=4, f=1. (b) n=7, f=2. Fig. 5: Convergence Time with No Jump faults. 0 50 100 150 200 250 70 100 250 500 Tim e to co nv erg e FFC orig alg: no faults... orig alg: NoJump faults ft alg:NoJump faults 0 50 100 150 200 250 300 350 400 450 70 100 250 500 Tim e to co nv erg e FFC orig alg: no faults orig alg: NoJump faults ft alg:NoJump faults 25 (c) n=10, f=3. Fig. 5 (Continued) Fig. 5(a...
Acceleration and evolution of faults: An example from the Hunter MountainPanamint Valley fault zone, Eastern California
Amelung, Falk
: R.D. van der Hilst Keywords: geodesy fault evolution InSAR rock mechanics Western United States assumes a monotonic increase in slip rate with time as the fault matures and straightens. The rate. However, before this can be realized, we need to better understand the various sources for discrepancies
Characterizing fault-plume intersection probability for geologic carbon sequestration risk assessment
Jordan, Preston D.; Oldenburg, Curtis M.; Nicot, Jean-Philippe
Leakage of CO{sub 2} out of the designated storage region via faults is a widely recognized concern for geologic carbon sequestration. The probability of such leakage can be separated into the probability of a plume encountering a fault and the probability of flow along such a fault. In the absence of deterministic fault location information, the first probability can be calculated from regional fault population statistics and modeling of the plume shape and size. In this study, fault statistical parameters were measured or estimated for WESTCARB's Phase III pilot test injection in the San Joaquin Valley, California. Combining CO{sub 2} plume model predictions with estimated fault characteristics resulted in a 3% probability that the CO{sub 2} plume will encounter a fault fully offsetting the 180 m (590 ft) thick seal. The probability of leakage is lower, likely much lower, as faults with this offset are probably low-permeability features in this area.
Fibre bundle framework for unitary quantum fault tolerance
Daniel Gottesman; Lucy Liuxuan Zhang
We introduce a differential geometric framework for describing families of quantum error-correcting codes and for understanding quantum fault tolerance. This work unifies the notion of topological fault tolerance with fault tolerance in other kinds of quantum error-correcting codes. In particular, we use fibre bundles with a natural flat projective connection to study the transformation of codewords under unitary fault-tolerant evolutions. We show that the fault-tolerant logical operations are given by the monodromy group for either of two bundles, both of which have flat projective connections. As concrete realizations of the general framework, we construct the bundles explicitly for two examples of fault-tolerant families of operations, the qudit transversal gates and the string operators in the toric code.
Fault simulation and test generation for small delay faults
Qiu, Wangqi
Delay faults are an increasingly important test challenge. Traditional delay fault models are incomplete in that they model only a subset of delay defect behaviors. To solve this problem, a more realistic delay fault model has been developed which...
Knezev, Maja
are triggered. Protection system consisting of protection relays and circuit breakers (CBs) will operate in order to de-energize faulted line. Different Intelligent Electronic Devices (IEDs) located in substations for the purpose of monitoring... in the control center by an operator who will mark fault event in a spreadsheet and inform other staff responsible for dealing with fault analysis and repair such as protection group or maintenance respectively. Protective relaying staff will be ready...
Knezev, Maja
are triggered. Protection system consisting of protection relays and circuit breakers (CBs) will operate in order to de-energize faulted line. Different Intelligent Electronic Devices (IEDs) located in substations for the purpose of monitoring... in the control center by an operator who will mark fault event in a spreadsheet and inform other staff responsible for dealing with fault analysis and repair such as protection group or maintenance respectively. Protective relaying staff will be ready...
Understanding S-shaped current-voltage characteristics of organic solar cells: Direct measurement of potential distributions by scanning Kelvin probe
Saive, Rebecca, E-mail: firstname.lastname@example.com; Kowalsky, Wolfgang [InnovationLab GmbH, 69115 Heidelberg (Germany) [InnovationLab GmbH, 69115 Heidelberg (Germany); Institut f³r Hochfrequenztechnik, TU Braunschweig, 38106 Braunschweig (Germany); Kirchhoff-Institute for Physics, Heidelberg University, 69120 Heidelberg (Germany); Mueller, Christian [InnovationLab GmbH, 69115 Heidelberg (Germany) [InnovationLab GmbH, 69115 Heidelberg (Germany); Kirchhoff-Institute for Physics, Heidelberg University, 69120 Heidelberg (Germany); Schinke, Janusz; Lovrincic, Robert [InnovationLab GmbH, 69115 Heidelberg (Germany) [InnovationLab GmbH, 69115 Heidelberg (Germany); Institut f³r Hochfrequenztechnik, TU Braunschweig, 38106 Braunschweig (Germany)
We present a comparison of the potential distribution along the cross section of bilayer poly(3-hexylthiophene)/1-(3-methoxycarbonyl)propyl-1-phenyl[6,6]C61 (P3HT/PCBM) solar cells, which show normal and anomalous, S-shaped current-voltage (IV) characteristics. We expose the cross sections of the devices with a focussed ion beam and measure them with scanning Kelvin probe microscopy. We find that in the case of S-shaped IV-characteristics, there is a huge potential drop at the PCBM/Al top contact, which does not occur in solar cells with normal IV-characteristics. This behavior confirms the assumption that S-shaped curves are caused by hindered charge transport at interfaces.
Post-Cretaceous faulting at head of Mississippi embayment
Nelson, W.J. (Illinois State Geological Survey, Champaign, IL (United States)); Harrison, R.W. (Geological Survey, Reston, VA (United States))
Recent mapping in southernmost Illinois and southeastern Missouri has revealed numerous faults that displace Cretaceous and Tertiary strata. Units as young as the Pliocene-Pleistocene( ) Mounds Gravel are deformed; some faults possibly displace Quaternary sediments. The faults strike northeast, dip nearly vertically, and exhibit characteristics of dextral strike-slip. Pull-apart grabens occur along right-stepping fault strands, they contain chaotically jumbled blocks of Paleozoic, Cretaceous and Tertiary rocks downdropped as much as 800 m relative to wall rocks. Faults at the head of the Mississippi embayment probably originated during Cambrian rifting (Reelfoot rift) and have a long, complex history of reactivation under different stress fields. Some faults are on strike with faults in the New Madrid seismic zone. Kinematics of post-Cretaceous displacements fit the contemporary stress regime of ENE-WSW compression. Similar fault orientations and kinematics, as well as close proximity, suggest a close link between faulting at the head of the embayment and ongoing tectonism in the New Madrid seismic zone.
Farrington, R.B.; Pruett, J.C. Jr.
A fault detecting apparatus and method are provided for use with an active solar system. The apparatus provides an indication as to whether one or more predetermined faults have occurred in the solar system. The apparatus includes a plurality of sensors, each sensor being used in determining whether a predetermined condition is present. The outputs of the sensors are combined in a pre-established manner in accordance with the kind of predetermined faults to be detected. Indicators communicate with the outputs generated by combining the sensor outputs to give the user of the solar system and the apparatus an indication as to whether a predetermined fault has occurred. Upon detection and indication of any predetermined fault, the user can take appropriate corrective action so that the overall reliability and efficiency of the active solar system are increased.
Transition-fault test generation
Cobb, Bradley Douglas
. One way to detect these timing defects is to apply test patterns to the integrated circuit that are generated using the transition-fault model. Unfortunately, industry's current transition-fault test generation schemes produce test sets that are too...
Fault tolerant linear actuator
Tesar, Delbert
In varying embodiments, the fault tolerant linear actuator of the present invention is a new and improved linear actuator with fault tolerance and positional control that may incorporate velocity summing, force summing, or a combination of the two. In one embodiment, the invention offers a velocity summing arrangement with a differential gear between two prime movers driving a cage, which then drives a linear spindle screw transmission. Other embodiments feature two prime movers driving separate linear spindle screw transmissions, one internal and one external, in a totally concentric and compact integrated module.
Computer hardware fault administration
Archer, Charles J. (Rochester, MN); Megerian, Mark G. (Rochester, MN); Ratterman, Joseph D. (Rochester, MN); Smith, Brian E. (Rochester, MN)
Computer hardware fault administration carried out in a parallel computer, where the parallel computer includes a plurality of compute nodes. The compute nodes are coupled for data communications by at least two independent data communications networks, where each data communications network includes data communications links connected to the compute nodes. Typical embodiments carry out hardware fault administration by identifying a location of a defective link in the first data communications network of the parallel computer and routing communications data around the defective link through the second data communications network of the parallel computer.
Analysis of Fault Permeability Using Mapping and Flow Modeling, Hickory Sandstone Aquifer, Central Texas
Nieto Camargo, Jorge E., E-mail: email@example.com; Jensen, Jerry L., E-mail: email@example.com [University of Calgary, Department of Chemical and Petroleum Engineering (Canada)
Reservoir compartments, typical targets for infill well locations, are commonly created by faults that may reduce permeability. A narrow fault may consist of a complex assemblage of deformation elements that result in spatially variable and anisotropic permeabilities. We report on the permeability structure of a km-scale fault sampled through drilling a faulted siliciclastic aquifer in central Texas. Probe and whole-core permeabilities, serial CAT scans, and textural and structural data from the selected core samples are used to understand permeability structure of fault zones and develop predictive models of fault zone permeability. Using numerical flow simulation, it is possible to predict permeability anisotropy associated with faults and evaluate the effect of individual deformation elements in the overall permeability tensor. We found relationships between the permeability of the host rock and those of the highly deformed (HD) fault-elements according to the fault throw. The lateral continuity and predictable permeability of the HD fault elements enhance capability for estimating the effects of subseismic faulting on fluid flow in low-shale reservoirs.
Fault Tolerant Quantum Filtering and Fault Detection for Quantum Systems
Qing Gao; Daoyi Dong; Ian R. Petersen
This paper aims to determine the fault tolerant quantum filter and fault detection equation for a class of open quantum systems coupled to laser fields and subject to stochastic faults. In order to analyze open quantum systems where the system dynamics involve both classical and quantum random variables, a quantum-classical probability space model is developed. Using a reference probability approach, a fault tolerant quantum filter and a fault detection equation are simultaneously derived for this class of open quantum systems. An example of two-level open quantum systems subject to Poisson-type faults is presented to illustrate the proposed method. These results have the potential to lead to a new fault tolerant control theory for quantum systems.
A frequency weighted approach to robust fault reconstruction and F. Crusca
Aldeen, Mohammad
is based on shaping the map from disturbance inputs to the fault es- timation error through frequency, these disturbances are assumed to be the output of a filter (with the previously mentioned frequency characteristicsA frequency weighted approach to robust fault reconstruction C.P. Tan and F. Crusca and M. Aldeen
Archer, Charles Jens (Rochester, MN); Pinnow, Kurt Walter (Rochester, MN); Ratterman, Joseph D. (Rochester, MN); Smith, Brian Edward (Rochester, MN)
An apparatus and program product check for nodal faults in a row of nodes by causing each node in the row to concurrently communicate with its adjacent neighbor nodes in the row. The communications are analyzed to determine a presence of a faulty node or connection.
Archer, Charles Jens (Rochester, MN); Pinnow, Kurt Walter (Rochester, MN); Ratterman, Joseph D. (Rochester, MN); Smith, Brian Edward (Rochester, MN)
An apparatus, program product and method check for nodal faults in a row of nodes by causing each node in the row to concurrently communicate with its adjacent neighbor nodes in the row. The communications are analyzed to determine a presence of a faulty node or connection.
Stress and fault rock controls on fault zone hydrology, Coso...
rock controls on fault zone hydrology, Coso geothermal field, CA Abstract In crystalline rock of the Coso Geothermal Field, CA, fractures are the primary source of permeability....
Electrical faults modeling of the photovoltaic generator Wail Rezgui1
Boyer, Edmond
energy by the photovoltaic phenomena. So, the degradation of these two factors means the presenceElectrical faults modeling of the photovoltaic generator Wail Rezgui1 , Le'la-Hayet Mouss1 , Kinza presented a new methodology for the mathematical modeling of the photovoltaic generator's characteristics
Fault interaction near Hollister, California
Mavko, G.M.
A numerical model is used to study fault stress slip near Hollister, California. The geometrically complex system of interacting faults, including the San Andreas, Calaveras, Sargent, and Busch faults, is approximated with a two-dimensional distribution of short planar fault segments in an elastic medium. The steady stress and slip rate are simulated by specifying frictional strength and stepping the remote stress ahead in time. The resulting computed fault stress is roughly proportional to the observed spatial density of small earthquakes, suggesting that the distinction between segments characterized by earthquakes and those with aseismic creep results, in part, from geometry. A nonsteady simulation is made by introducing, in addition, stress drops for individual moderate earthquakes. A close fit of observed creep with calculated slip on the Calaveras and San Andreas faults suggests that many changes in creep rate (averaged over several months) are caused by local moderate earthquakes. In particular, a 3-year creep lag preceding the August 6, 1979, Coyote Lake earthquake on the Calaveras fault seems to have been a direct result of the November 28, 1974, Thanksgiving Day earthquake on the Busch fault. Computed lags in slip rate preceding some other moderate earthquakes in the area are also due to earlier earthquakes. Although the response of the upper 1 km of the fault zone may cause some individual creep events and introduce delays in others, the long-term rate appears to reflect deep slip.
Darmann, Francis Anthony
A fault current limiter (FCL) includes a series of high permeability posts for collectively define a core for the FCL. A DC coil, for the purposes of saturating a portion of the high permeability posts, surrounds the complete structure outside of an enclosure in the form of a vessel. The vessel contains a dielectric insulation medium. AC coils, for transporting AC current, are wound on insulating formers and electrically interconnected to each other in a manner such that the senses of the magnetic field produced by each AC coil in the corresponding high permeability core are opposing. There are insulation barriers between phases to improve dielectric withstand properties of the dielectric medium.
Broader source: Energy.gov (indexed) [DOE]
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Observer-based fault detection for nuclear reactors
Li, Qing, 1972-
This is a study of fault detection for nuclear reactor systems. Basic concepts are derived from fundamental theories on system observers. Different types of fault- actuator fault, sensor fault, and system dynamics fault ...
Hussein, Khalid
Citation Information: Originator: Earth Science &Observation Center (ESOC), CIRES, University of Colorado at Boulder Originator: Colorado Geological Survey (CGS) Publication Date: 2012 Title: Regional Faults Edition: First Publication Information: Publication Place: Earth Science & Observation Center, Cooperative Institute for Research in Environmental Science, University of Colorado, Boulder Publisher: Earth Science &Observation Center (ESOC), CIRES, University of Colorado at Boulder Description: This layer contains the regional faults of Colorado Spatial Domain: Extent: Top: 4543192.100000 m Left: 144385.020000 m Right: 754585.020000 m Bottom: 4094592.100000 m Contact Information: Contact Organization: Earth Science &Observation Center (ESOC), CIRES, University of Colorado at Boulder Contact Person: Khalid Hussein Address: CIRES, Ekeley Building Earth Science & Observation Center (ESOC) 216 UCB City: Boulder State: CO Postal Code: 80309-0216 Country: USA Contact Telephone: 303-492-6782 Spatial Reference Information: Coordinate System: Universal Transverse Mercator (UTM) WGSÆ1984 Zone 13N False Easting: 500000.00000000 False Northing: 0.00000000 Central Meridian: -105.00000000 Scale Factor: 0.99960000 Latitude of Origin: 0.00000000 Linear Unit: Meter Datum: World Geodetic System 1984 (WGS Æ984) Prime Meridian: Greenwich Angular Unit: Degree Digital Form: Format Name: Shape file
Pry, Samuel
to do so. For example, an eclipse of the sun might cause a "rustic" to wonder while it would not have such an effect on an astronomer. According to Aquinas, the reason the rustic wonders at the eclipse while the astronomer does not is the latter... ". . . when [God] chooses [to] produc[e] certain effects to which secondary causes do not extend We can apply the insights of Aquinas' understanding of the miraculous to Augustine's earlier definition as follows. According to Aquinas a miracle is "unusual...
Synchronized sampling improves fault location
Kezunovic, M. [Texas A and M Univ., College Station, TX (United States)] [Texas A and M Univ., College Station, TX (United States); Perunicic, B. [Lamar Univ., Beaumont, TX (United States)] [Lamar Univ., Beaumont, TX (United States)
Transmission line faults must be located accurately to allow maintenance crews to arrive at the scene and repair the faulted section as soon as possible. Rugged terrain and geographical layout cause some sections of power transmission lines to be difficult to reach. In the past, a variety of fault location algorithms were introduced as either an add-on feature in protective relays or stand-alone implementation in fault locators. In both cases, the measurements of current and voltages were taken at one terminal of a transmission line only. Under such conditions, it may become difficult to determine the fault location accurately, since data from other transmission line ends are required for more precise computations. In the absence of data from the other end, existing algorithms have accuracy problems under several circumstances, such as varying switching and loading conditions, fault infeed from the other end, and random value of fault resistance. Most of the one-end algorithms were based on estimation of voltage and current phasors. The need to estimate phasors introduces additional difficulty in high-speed tripping situations where the algorithms may not be fast enough in determining fault location accurately before the current signals disappear due to the relay operation and breaker opening. This article introduces a unique concept of high-speed fault location that can be implemented either as a simple add-on to the digital fault recorders (DFRs) or as a stand-alone new relaying function. This advanced concept is based on the use of voltage and current samples that are synchronously taken at both ends of a transmission line. This sampling technique can be made readily available in some new DFR designs incorporating receivers for accurate sampling clock synchronization using the satellite Global Positioning System (GPS).
Abstract Due to reduction in device feature size and supply voltage, the sensitivity to radiation induced transient faults of
Marculescu, Diana
, the protection from radiation induced transient faults has become as important as other product characteristics to radiation induced transient faults of digital systems increases dramatically. In this paper, we present two targeting radiation hardening leading up to 80% SER reduction when applied to a subset of ISCAS'89
Automated Fault Location In Smart Distribution SystemsĀ
Lotfifard, Saeed
............................................................................................................................ 88 x LIST OF FIGURES Page Figure 1 Multiple possible fault location estimation for a fault at node A ........................ 7 Figure 2 Simple faulted network model [1] ® [2011] IEEE ............................................ 40 Figure 3... Types C and D voltage sags for different phases [51] ® [2003] IEEE .............. 42 Figure 4 Rf estimation procedure [1] ® [2011] IEEE ...................................................... 45 Figure 5 Flow chart of the fault location algorithm [1...
Hot Pot Detail - Evidence of Quaternary Faulting
DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]
Lane, Michael
Compilation of published data, field observations and photo interpretation relevant to Quaternary faulting at Hot Pot.
Hot Pot Detail - Evidence of Quaternary Faulting
Lane, Michael
Compilation of published data, field observations and photo interpretation relevant to Quaternary faulting at Hot Pot.
Jha, Kamal N. (Bethel Park, PA)
An arc fault detection system for use on ungrounded or high-resistance-grounded power distribution systems is provided which can be retrofitted outside electrical switchboard circuits having limited space constraints. The system includes a differential current relay that senses a current differential between current flowing from secondary windings located in a current transformer coupled to a power supply side of a switchboard, and a total current induced in secondary windings coupled to a load side of the switchboard. When such a current differential is experienced, a current travels through a operating coil of the differential current relay, which in turn opens an upstream circuit breaker located between the switchboard and a power supply to remove the supply of power to the switchboard.
Jha, K.N.
An arc fault detection system for use on ungrounded or high-resistance-grounded power distribution systems is provided which can be retrofitted outside electrical switchboard circuits having limited space constraints. The system includes a differential current relay that senses a current differential between current flowing from secondary windings located in a current transformer coupled to a power supply side of a switchboard, and a total current induced in secondary windings coupled to a load side of the switchboard. When such a current differential is experienced, a current travels through a operating coil of the differential current relay, which in turn opens an upstream circuit breaker located between the switchboard and a power supply to remove the supply of power to the switchboard. 1 fig.
Fault-tolerant rotary actuator
Tesar, Delbert
A fault-tolerant actuator module, in a single containment shell, containing two actuator subsystems that are either asymmetrically or symmetrically laid out is provided. Fault tolerance in the actuators of the present invention is achieved by the employment of dual sets of equal resources. Dual resources are integrated into single modules, with each having the external appearance and functionality of a single set of resources.
Development of Characterization Technology for Fault Zone Hydrology
Karasaki, Kenzi
TECHNOLOGY FOR FAULT ZONE HYDROLOGY Kenzi Karasaki Lawrencefor characterizing the hydrology of fault zones, recognizingstructure of faults to hydrology, that it still may be
active fault diagnosis: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Harrold, Mary Jean 453 Fault Tolerant Control with Additive Compensation for Faults in an Automotive Damper Physics Websites Summary: Fault Tolerant Control with Additive...
Passive fault current limiting device
Evans, Daniel J. (Wheeling, IL); Cha, Yung S. (Darien, IL)
A passive current limiting device and isolator is particularly adapted for use at high power levels for limiting excessive currents in a circuit in a fault condition such as an electrical short. The current limiting device comprises a magnetic core wound with two magnetically opposed, parallel connected coils of copper, a high temperature superconductor or other electrically conducting material, and a fault element connected in series with one of the coils. Under normal operating conditions, the magnetic flux density produced by the two coils cancel each other. Under a fault condition, the fault element is triggered to cause an imbalance in the magnetic flux density between the two coils which results in an increase in the impedance in the coils. While the fault element may be a separate current limiter, switch, fuse, bimetal strip or the like, it preferably is a superconductor current limiter conducting one-half of the current load compared to the same limiter wired to carry the total current of the circuit. The major voltage during a fault condition is in the coils wound on the common core in a preferred embodiment.
Passive fault current limiting device
Evans, D.J.; Cha, Y.S.
A passive current limiting device and isolator is particularly adapted for use at high power levels for limiting excessive currents in a circuit in a fault condition such as an electrical short. The current limiting device comprises a magnetic core wound with two magnetically opposed, parallel connected coils of copper, a high temperature superconductor or other electrically conducting material, and a fault element connected in series with one of the coils. Under normal operating conditions, the magnetic flux density produced by the two coils cancel each other. Under a fault condition, the fault element is triggered to cause an imbalance in the magnetic flux density between the two coils which results in an increase in the impedance in the coils. While the fault element may be a separate current limiter, switch, fuse, bimetal strip or the like, it preferably is a superconductor current limiter conducting one-half of the current load compared to the same limiter wired to carry the total current of the circuit. The major voltage during a fault condition is in the coils wound on the common core in a preferred embodiment. 6 figs.
Coordinated Fault-Tolerance for High-Performance Computing Final Project Report
Panda, Dhabaleswar Kumar [The Ohio State University; Beckman, Pete
With the Coordinated Infrastructure for Fault Tolerance Systems (CIFTS, as the original project came to be called) project, our aim has been to understand and tackle the following broad research questions, the answers to which will help the HEC community analyze and shape the direction of research in the field of fault tolerance and resiliency on future high-end leadership systems. #15; Will availability of global fault information, obtained by fault information exchange between the different HEC software on a system, allow individual system software to better detect, diagnose, and adaptively respond to faults? If fault-awareness is raised throughout the system through fault information exchange, is it possible to get all system software working together to provide a more comprehensive end-to-end fault management on the system? #15; What are the missing fault-tolerance features that widely used HEC system software lacks today that would inhibit such software from taking advantage of systemwide global fault information? #15; What are the practical limitations of a systemwide approach for end-to-end fault management based on fault awareness and coordination? #15; What mechanisms, tools, and technologies are needed to bring about fault awareness and coordination of responses on a leadership-class system? #15; What standards, outreach, and community interaction are needed for adoption of the concept of fault awareness and coordination for fault management on future systems? Keeping our overall objectives in mind, the CIFTS team has taken a parallel fourfold approach. #15; Our central goal was to design and implement a light-weight, scalable infrastructure with a simple, standardized interface to allow communication of fault-related information through the system and facilitate coordinated responses. This work led to the development of the Fault Tolerance Backplane (FTB) publish-subscribe API specification, together with a reference implementation and several experimental implementations on top of existing publish-subscribe tools. #15; We enhanced the intrinsic fault tolerance capabilities representative implementations of a variety of key HPC software subsystems and integrated them with the FTB. Targeting software subsystems included: MPI communication libraries, checkpoint/restart libraries, resource managers and job schedulers, and system monitoring tools. #15; Leveraging the aforementioned infrastructure, as well as developing and utilizing additional tools, we have examined issues associated with expanded, end-to-end fault response from both system and application viewpoints. From the standpoint of system operations, we have investigated log and root cause analysis, anomaly detection and fault prediction, and generalized notification mechanisms. Our applications work has included libraries for fault-tolerance linear algebra, application frameworks for coupled multiphysics applications, and external frameworks to support the monitoring and response for general applications. #15; Our final goal was to engage the high-end computing community to increase awareness of tools and issues around coordinated end-to-end fault management.
Bisectional fault detection system
Archer, Charles Jens (Rochester, MN); Pinnow, Kurt Walter (Rochester, MN); Ratterman, Joseph D. (Rochester, MN); Smith, Brian Edward (Rochester, MN)
An apparatus, program product and method logically divide a group of nodes and causes node pairs comprising a node from each section to communicate. Results from the communications may be analyzed to determine performance characteristics, such as bandwidth and proper connectivity.
Condition Assessment and Fault Prognostics of Microelectromechanical Systems
Paris-Sud XI, Universitķ de
monitoring, Condition assessment, Fault detection, Fault diagnostics, Fault prognostics. Corresponding, batteries, etc.) to complete machines (wind turbines, electrical motors, machining tools, etc.). SeveralCondition Assessment and Fault Prognostics of Microelectromechanical Systems K. Medjaher , H. Skima
Sensor Fault Detection and Isolation System
Yang, Cheng-Ken
The purpose of this research is to develop a Fault Detection and Isolation (FDI) system which is capable to diagnosis multiple sensor faults in nonlinear cases. In order to lead this study closer to real world applications in oil industries...
A Rectilinear-Monotone Polygonal Fault Block Model for Fault-Tolerant Minimal Routing
Wang, Dajin
]. In rectangular model, all faulty nodes are grouped in dis- jointed, rectangular areas, called fault blocksA Rectilinear-Monotone Polygonal Fault Block Model for Fault-Tolerant Minimal Routing in Mesh Dajin Wang, Member, IEEE Abstract--We propose a new fault block model, Minimal-Connected-Component (MCC
Final Project Report: Self-Correcting Controls for VAV System Faults Filter/Fan/Coil and VAV Box Sections
Brambley, Michael R.; Fernandez, Nicholas; Wang, Weimin; Cort, Katherine A.; Cho, Heejin; Ngo, Hung; Goddard, James K.
This report addresses original research by the Pacific Northwest National Laboratory for the California Institute for Energy and Environment on self-correcting controls for variable-air-volume (VAV) heating, ventilating and air-conditioning systems and focuses specifically on air handling and VAV box components of the air side of the system. A complete set of faults for these components was compiled and a fault mode analysis performed to understand the detectable symptoms of the faults and the chain of causation. A set of 26 algorithms was developed to facilitate the automatic correction of these faults in typical commercial VAV systems. These algorithms include training tests that are used during commissioning to develop models of normal system operation, passive diagnostics used to detect the symptoms of faults, proactive diagnostics used to diagnose the cause of a fault, and finally fault correction algorithms. Ten of the twenty six algorithms were implemented in a prototype software package that interfaces with a test bed facility at PNNL's Richland, WA, laboratory. Measurement bias faults were instigated in the supply-air temperature sensor and the supply-air flow meter to test the algorithms developed. The algorithms as implemented in the laboratory software correctly detected, diagnosed and corrected these faults. Finally, an economic and impact assessment was performed for the State of California for deployment of self-correcting controls. Assuming 15% HVAC energy savings and a modeled deployment profile, 3.1-5.8 TBu of energy savings are possible by year 15.
A short circuit study is performed to determine the maximum fault current that the system protective devices, transformers, and interconnections would he subject to in event of a three phase, phase-to-phase, or phase-to-ground fault. Generally, the short circuit study provides the worst case fault current levels at each bus or connection point of the system.
High temperature superconducting fault current limiter
Hull, J.R.
A fault current limiter for an electrical circuit is disclosed. The fault current limiter includes a high temperature superconductor in the electrical circuit. The high temperature superconductor is cooled below its critical temperature to maintain the superconducting electrical properties during operation as the fault current limiter. 15 figs.
High temperature superconducting fault current limiter
Hull, John R. (Hinsdale, IL)
A fault current limiter (10) for an electrical circuit (14). The fault current limiter (10) includes a high temperature superconductor (12) in the electrical circuit (14). The high temperature superconductor (12) is cooled below its critical temperature to maintain the superconducting electrical properties during operation as the fault current limiter (10).
Using Fault Model Enforcement to Improve Availability
instead that a new approach, called fault model enforcement, that maps actual faults to expected faults on a constellation of interconnected systems--a typical example is cluster-based systems [4]. Traditional database centers around a set of closely guarded racks and data closets woven together by intricate networks
Using Fault Model Enforcement to Improve Availability
Martin, Richard P.
that a new approach, called fault model enforcement, that maps actual faults to expected faults on a constellation of interconnected systems--a typical example is cluster-based systems [4]. Traditional database centers around a set of closely guarded racks and data closets woven together by intricate networks
Cell boundary fault detection system
Archer, Charles Jens (Rochester, MN); Pinnow, Kurt Walter (Rochester, MN); Ratterman, Joseph D. (Rochester, MN); Smith, Brian Edward (Rochester, MN)
An apparatus and program product determine a nodal fault along the boundary, or face, of a computing cell. Nodes on adjacent cell boundaries communicate with each other, and the communications are analyzed to determine if a node or connection is faulty.
Software Fault Diagnosis Peter Zoeteweij
Zoeteweij, Peter
Lab, Faculty of Electrical Engineering, Mathematics, and Computer Science, Delft University-to-day basis is constantly growing. Combined with a practically constant rate of faults per line of code in the software development cycle, which aim at exposing such discrepancies. In this context, automated diagnosis
Development of a bridge fault extractor tool
Bhat, Nandan D.
as interlayer faults. An example of an intralayer fault is a bridge between two adjacent metal1 lines. An example of an interlayer fault is a short between overlapping polysilicon and metal1 lines. The rest of this thesis is organized as follows: Chapter 2... between two adjacent 6 metal1 lines. An example of an interlayer fault is a short between overlapping polysilicon and metal1 lines. A recent survey of fault extractors describes their different features [15]. Some tools such as VLASIC [16] attempt...
Thoughts Regarding the Dimensions of Faults at Rainier and Aqueduct Mesas, Nye County, Nevada, Based on Surface and Underground Mapping
Drellack, S.L.; Prothro, L.B.; Townsend, M.J.; Townsend, D.R.
The geologic setting and history, along with observations through 50 years of detailed geologic field work, show that large-displacement (i.e., greater than 30 meters of displacement) syn- to post-volcanic faults are rare in the Rainier Mesa area. Faults observed in tunnels and drill holes are mostly tight, with small displacements (most less than 1.5 meters) and small associated damage zones. Faults are much more abundant in the zeolitized tuffs than in the overlying vitric tuffs, and there is little evidence that faults extend downward from the tuff section through the argillic paleocolluvium into pre-Tertiary rocks. The differences in geomechanical characteristics of the various tuff lithologies at Rainier Mesa suggest that most faults on Rainer Mesa are limited to the zeolitic units sandwiched between the overlying vitric bedded tuffs and the underlying pre-Tertiary units (lower carbonate aquifer¢3, lower clastic confining unit¢1, and Mesozoic granite confining unit).
The detection of high impedance faults using random fault behavior
Carswell, Patrick Wayne
In response to an Electric Power Research Institute (EPRI) request for pro- posed solutions for the detection of high impedance faults, the Hughes Aircraft Corporation developed a detection technique based solely on the level of the third harmonic current... for proposed solutions from EPRI that brought the Hughes technique, Power Technologies Incorporated (PTI) proposed a technique which statistically monitors the first, third, and fifth harmonics of current to make a, determination as to the presence of a high...
Development of secondary faults between en echelon, oblique-slip faults: examples from basement controlled, small-fault systems in the Llano Uplift of central Texas
Hedgcoxe, Howard Reiffert
correspond to the NE trending set of faults and the secondary antithetic faults corre- spond to the N to NNE set (Figure 12). Fractures, represented by the dashed lines in Figure 12, occur in direct association with the primary and secondary faults...DEVELOPMENT OF SECONDARY FAULTS BETWEEN EN ECHELON, OBLIQUE-SLIP FAULTS: EXAMPLES FROM BASEMENT CONTROLLED, SMALL-FAULT SYSTEMS IN THE LLANO UPLIFT OF CENTRAL TEXAS A Thesis by HOWARD REIFFERT HEDGCOXE Submitted to the Graduate College...
Fault prophet : a fault injection tool for large scale computer systems
Tchwella, Tal
In this thesis, I designed and implemented a fault injection tool, to study the impact of soft errors for large scale systems. Fault injection is used as a mechanism to simulate soft errors, measure the output variability ...
Realistic fault modeling and quality test generation of combined delay faultsĀ
Thadhlani, Ajaykumar A
With increasing operating speed and shrinking technology, timing defects in integrated circuits are becoming increasingly important. The well established stuck-at-fault model is not sufficient because it is a static fault ...
Collateral damage: Evolution with displacement of fracture distribution and secondary fault strands in fault damage zones
Savage, Heather M.; Brodsky, Emily E.
E. McCallum (1999), Reservoir damage around faults: OutcropSkar (2005), Controls on damage zone asymmetry of a normal2007), The evolution of the damage zone with fault growth in
The effects of lithology and initial fault angle in physical models of fault-propagation folds
McLain, Christopher Thomas
Experimentally deformed physical rock models are used to examine the effects of changing mechanical stratigraphy and initial fault angle on the development of fault-propagation folds over a flat-ramp-flat thrust geometry. This study also...
Collateral damage: Evolution with displacement of fracture distribution and secondary fault strands in fault damage zones
Savage, Heather M.; Brodsky, Emily E.
8 m fault 14 m fault Lonewolf Wadi Araba Carboneras Caletasiltstone, conglomerate Wadi As Sir Limestone gneiss schistFaulkner et al. , 2003], and Wadi Araba [Du Bernard et al. ,
Fault-tolerant dynamic task graph scheduling
Kurt, Mehmet C.; Krishnamoorthy, Sriram; Agrawal, Kunal; Agrawal, Gagan
In this paper, we present an approach to fault tolerant execution of dynamic task graphs scheduled using work stealing. In particular, we focus on selective and localized recovery of tasks in the presence of soft faults. We elicit from the user the basic task graph structure in terms of successor and predecessor relationships. The work stealing-based algorithm to schedule such a task graph is augmented to enable recovery when the data and meta-data associated with a task get corrupted. We use this redundancy, and the knowledge of the task graph structure, to selectively recover from faults with low space and time overheads. We show that the fault tolerant design retains the essential properties of the underlying work stealing-based task scheduling algorithm, and that the fault tolerant execution is asymptotically optimal when task re-execution is taken into account. Experimental evaluation demonstrates the low cost of recovery under various fault scenarios.
Automated Fault Location In Smart Distribution Systems
Lotfifard, Saeed
Quality Meters (PQM), are installed to capture harmonics and certain disturbances for analyzing the power quality indices. Digital Protective Relays are utilized to detect occurrence of the faults and isolate faulted section as fast as possible. Digital... Protective Relays) use synchronous methods [28]. Therefore, if the available data is provided by RTUs, fault location methods that operate based on direct comparison of the input samples cannot be 17 utilized. However, if the data could be gathered from...
Detachment Faulting & Geothermal Resources - Pearl Hot Spring...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
Faulting & Geothermal Resources - Pearl Hot Spring, NV Conducting a 3D Converted Shear Wave Project to Reduce Exploration Risk at Wister, CA Crump Geyser: High Precision...
Towards Fault-Tolerant Digital Microfluidic Lab-on-Chip: Defects, Fault Modeling, Testing, and Reconfiguration
Chakrabarty, Krishnendu
Towards Fault-Tolerant Digital Microfluidic Lab-on-Chip: Defects, Fault Modeling, Testing, NC 27708, USA Abstract Dependability is an important attribute for microfluidic lab-on-chip devices microfluidic lab-on-chip systems. Defects are related to logical fault models that can be viewed not only
Contribution of Identified Active Faults to Near Fault Seismic Hazard in the Flinders Ranges
Sandiford, Mike
Somerville1 , Peggy Quijada1 , Hong Kie Thio1 , Mike Sandiford2 and Mark Quigley2 1. URS Corporation estimates of fault slip rate from Quigley et al. (2006) to quantify the seismic activity rate on the faults of these models was used in conjunction with the active fault model. Quigley et al. (2006) identified a system
A fault location approach for fuzzy fault section estimation on radial distribution feeders
Andoh, Kwame Sarpong
was involved in the fault was evaluated using the event-phase possibility values and line section phase topology information. The fault distance algorithm was used to eliminate sections of the feeder that were not likely to be possible faulted section...
Shallow faults mapped with seismic reflections: Lost River Fault, Idaho
Mubarik, Ali; Miller, Richard D.; Steeples, Don W.
stations 132 and 160. Total bedrock dis?lace- ment interpreted along this seismic survey line is approxa- mately 6 m, representing 4 to 6 times more displacement than is observed on either the common offset refraction section or at the surface..., vol. A, U.S. Geological Survey Open-file Report 85-290, 182-194, 1985. Crone, A. J., and M. N. Macbette, Surface faulting accompa- nying the Borah Peak earthquake, central Idaho, Geology, 12, 664-667, 1984. Crone, A. J., M. N. Macbette, M. G...
Accurate resistive bridge fault modeling, simulation, and test generationĀ
Sar-Dessai, Vijay Ramesh
Resistive bridging faults in CMOS combinational circuits are studied in this work. Bridging faults are modeled using HSPICE circuit simulation of the various types of bridging faults that can occur in CMOS combinational ...
Earthquake behavior and structure of oceanic transform faults
Roland, Emily Carlson
Oceanic transform faults that accommodate strain at mid-ocean ridge offsets represent a unique environment for studying fault mechanics. Here, I use seismic observations and models to explore how fault structure affects ...
Low-cost motor drive embedded fault diagnosis systems
Akin, Bilal
Electric motors are used widely in industrial manufacturing plants. Bearing faults, insulation faults, and rotor faults are the major causes of electric motor failures. Based on the line current analysis, this dissertation mainly deals with the low...
Accurate resistive bridge fault modeling, simulation, and test generation
Sar-Dessai, Vijay Ramesh
Resistive bridging faults in CMOS combinational circuits are studied in this work. Bridging faults are modeled using HSPICE circuit simulation of the various types of bridging faults that can occur in CMOS combinational circuits. The results...
Off-fault Damage Associated with a Localized Bend in the North Branch San Gabriel Fault, California
Becker, Andrew 1987-
Structures within very large displacement, mature fault zones, such as the North Branch San Gabriel Fault (NBSGF), are the product of a complex combination of processes. Off-fault damage within a damage zone and first-order geometric asperities...
Improving Distribution System Reliability Through Risk-base Doptimization of Fault Management and Improved Computer-based Fault Location
Dong, Yimai
)Æs regulation on power quality. Optimization in fault management tasks has the potential of improving system reliability by reducing the duration and scale of outages caused by faults through fast fault isolation and service restoration. The research reported...
An algorithm for faulted phase and feeder selection under high impedance fault conditions
Benner, Carl Lee
proximate lines served by the same substation. Because of this signal propagation, a fault will be detected simultaneously on the faulted line and possibly several other lines served by the substation. Since it would not be plausible for a utility company... to deenergize the entire area served by a substation due to a high impedance fault on one lateral, a technique is needed to discriminate the faulted line from neighboring healthy feeders and healthy phases of the faulted feeder. Such a technique would also...
active fault segments: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Fault activation Kuzmanov, Georgi 140 Early stage evolution of growth faults: 3D seismic insights from the Levant Basin, Eastern Mediterranean Materials Science Websites...
Modeling and Measurement Constraints in Fault Diagnostics for HVAC Systems
Najafi, Massieh
in Fault Diagnostics for HVAC Systems Massieh Najafi 1 ,tools for determining HVAC diagnostics, methods todetect faults in HVAC systems are still generally
Fault-tolerant TCP mechanismsĀ
Satapati, Suresh Kumar
point (TSAPs). In BSD, a service access point is a TCP socket identified by an IP address and port number, A TCP based fault-tolerant service is realized by replicating a server program onto one or more hosts and by having all replicas bind... backup sends the SEQUENCE NUMBER of the segment it recently sent. Since the primary server doesn't exist, the client does not acknowledge. The TCP on backup server keeps retransmitting the same segment, which can be counted to initiate a...
Fault Controlled | Open Energy Information
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Spatial analysis of hypocenter to fault relationships for determining fault process zone width in Japan.
Arnold, Bill Walter; Roberts, Barry L.; McKenna, Sean Andrew; Coburn, Timothy C. (Abilene Christian University, Abilene, TX)
Preliminary investigation areas (PIA) for a potential repository of high-level radioactive waste must be evaluated by NUMO with regard to a number of qualifying factors. One of these factors is related to earthquakes and fault activity. This study develops a spatial statistical assessment method that can be applied to the active faults in Japan to perform such screening evaluations. This analysis uses the distribution of seismicity near faults to define the width of the associated process zone. This concept is based on previous observations of aftershock earthquakes clustered near active faults and on the assumption that such seismic activity is indicative of fracturing and associated impacts on bedrock integrity. Preliminary analyses of aggregate data for all of Japan confirmed that the frequency of earthquakes is higher near active faults. Data used in the analysis were obtained from NUMO and consist of three primary sources: (1) active fault attributes compiled in a spreadsheet, (2) earthquake hypocenter data, and (3) active fault locations. Examination of these data revealed several limitations with regard to the ability to associate fault attributes from the spreadsheet to locations of individual fault trace segments. In particular, there was no direct link between attributes of the active faults in the spreadsheet and the active fault locations in the GIS database. In addition, the hypocenter location resolution in the pre-1983 data was less accurate than for later data. These pre-1983 hypocenters were eliminated from further analysis.
Optimized Fault Location Final Project Report
Engineering Research Center Optimized Fault Location Concurrent Technologies Corporation Final Project Report by the Concurrent Technologies Corporation (CTC) and the Power Systems Engineering Research Center (PSERC). NeitherOptimized Fault Location Final Project Report Power Systems Engineering Research Center A National
Sensor Fault Diagnosis Using Principal Component AnalysisĀ
Sharifi, Mahmoudreza
The purpose of this research is to address the problem of fault diagnosis of sensors which measure a set of direct redundant variables. This study proposes: 1. A method for linear senor fault diagnosis 2. An analysis of isolability and detectability...
Sensor Fault Diagnosis Using Principal Component Analysis
Sharifi, Mahmoudreza
The purpose of this research is to address the problem of fault diagnosis of sensors which measure a set of direct redundant variables. This study proposes: 1. A method for linear senor fault diagnosis 2. An analysis of isolability and detectability...
Povinelli, Richard J.
INDUCTION MOTOR FAULT DIAGNOSTIC AND MONITORING METHODS by Aderiano M. da Silva, B.S. A Thesis;i Abstract Induction motors are used worldwide as the "workhorse" in industrial applications material. However, induction motor faults can be detected in an initial stage in order to prevent
Self-triggering superconducting fault current limiter
Yuan, Xing (Albany, NY); Tekletsadik, Kasegn (Rexford, NY)
A modular and scaleable Matrix Fault Current Limiter (MFCL) that functions as a "variable impedance" device in an electric power network, using components made of superconducting and non-superconducting electrically conductive materials. The matrix fault current limiter comprises a fault current limiter module that includes a superconductor which is electrically coupled in parallel with a trigger coil, wherein the trigger coil is magnetically coupled to the superconductor. The current surge doing a fault within the electrical power network will cause the superconductor to transition to its resistive state and also generate a uniform magnetic field in the trigger coil and simultaneously limit the voltage developed across the superconductor. This results in fast and uniform quenching of the superconductors, significantly reduces the burnout risk associated with non-uniformity often existing within the volume of superconductor materials. The fault current limiter modules may be electrically coupled together to form various "n" (rows).times."m" (columns) matrix configurations.
The Starr fault system of southeastern Ohio
Brannock, M.C. (Qauker State Corp., Belpre, OH (United States))
The Starr fault system is a series of east-west-trending faults located in southeastern Ohio. This fault system was discovered by mapping the anomalous sedimentary sequence of the [open quotes]Big Lime[close quotes]. The Big Lime is a driller's term for the stratigraphic section that includes the Lower Devonian Onondaga through Middle Silurian Lockport formations. The use of trend-surface analysis identified the probable fault orientation, which was then verified by seismic. The system is a series of high-angle faults, originating in the Precambrian, that occur along a narrow corridor traversing several townships. Analysis of the sedimentary section preserved by faulting indicates fault movement after the deposition of the Bass Island Formation, which was followed by a regional unconformity that removed the Bass Islands and a part of the upper Salina Formation. The Onondaga subsequently was deposited, masking fault movement evidence in the shallower formations. Some minor movement occurred later, as evidenced by the expansion in the Devonian shale sequence. The geometry of the fault system and other data suggest a pattern similar to the Albio-Scipio field of southern Michigan. A group of wells were drilled to test the Ordovician Trenton and Black River formations to determine the existence of secondary dolomite, which could be a potential reservoir. Secondary dolomite was encountered, but no commercial hydrocarbons were found in either the Trenton or Black River. Other formations produced hydrocarbons and water from fractured zones that were not known for this behavior. Other probable fault systems in southern Ohio, identified by using the same mapping techniques, may provide deeper targets for future drilling.
Crossing Active Faults on the Sakhalin II Onshore Pipeline Route: Analysis Methodology and Basic Design
Vitali, Luigino [Snamprogetti-Saipem, Via Toniolo, 1, 61032 Fano, Luigino (Italy); Mattiozzi, Pierpaolo [Snamprogetti-Saipem, Via Toniolo, 1, 61032 Fano (Italy)
Twin oil (20 and 24 inch) and gas (20 and 48 inch) pipeline systems stretching 800 km are being constructed to connect offshore hydrocarbon deposits from the Sakhalin II concession in the North to an LNG plant and oil export terminal in the South of Sakhalin island. The onshore pipeline route follows a regional fault zone and crosses individual active faults at 19 locations. Sakhalin Energy, Design and Construction companies took significant care to ensure the integrity of the pipelines, should large seismic induced ground movements occur during the Operational life of the facilities. Complex investigations including the identification of the active faults, their precise location, their particular displacement values and assessment of the fault kinematics were carried out to provide input data for unique design solutions. Lateral and reverse offset displacements of 5.5 and 4.5 m respectively were determined as the single-event values for the design level earthquake (DLE)--the 1000-year return period event. Within the constraints of a pipeline route largely fixed, the underground pipeline fault crossing design was developed to define the optimum routing which would minimize stresses and strain using linepipe materials which had been ordered prior to the completion of detailed design, and to specify requirements for pipe trenching shape, materials, drainage system, etc. This Paper describes the steps followed to formulate the concept of the special trenches and the analytical characteristics of the Model.
Fault-Tolerant CCM Middleware for Embedded Adaptive Dependability (MEAD)
Narasimhan, Priya
Fault-Tolerant CCM Middleware for Embedded Adaptive Dependability (MEAD) Real-Time Fault Narasimhan Carnegie Mellon University CCM Workshop, Nashville, TN December 10, 2003 #12;12/11/2003 Page 2 Model precursor to a real-time fault tolerant CCM Ł Real-Time Fault Tolerant CORBA Standard RFP launched
Statistical Fault Detection for Parallel Applications with AutomaDeD
Bronevetsky, G; Laguna, I; Bagchi, S; de Supinski, B R; Ahn, D; Schulz, M
Today's largest systems have over 100,000 cores, with million-core systems expected over the next few years. The large component count means that these systems fail frequently and often in very complex ways, making them difficult to use and maintain. While prior work on fault detection and diagnosis has focused on faults that significantly reduce system functionality, the wide variety of failure modes in modern systems makes them likely to fail in complex ways that impair system performance but are difficult to detect and diagnose. This paper presents AutomaDeD, a statistical tool that models the timing behavior of each application task and tracks its behavior to identify any abnormalities. If any are observed, AutomaDeD can immediately detect them and report to the system administrator the task where the problem began. This identification of the fault's initial manifestation can provide administrators with valuable insight into the fault's root causes, making it significantly easier and cheaper for them to understand and repair it. Our experimental evaluation shows that AutomaDeD detects a wide range of faults immediately after they occur 80% of the time, with a low false-positive rate. Further, it identifies weaknesses of the current approach that motivate future research.
1. Detect ground faults in PV arrays mounted on the roofs of 2. Interrupt the fault current
Johnson, Eric E.
1. Detect ground faults in PV arrays mounted on the roofs of dwellings 2. Interrupt the fault current 3. Indicate that a ground fault had occurred 4. Disconnect the faulted part of the PV array 5. "Crowbar" (short-circuit) the PV array The original GFPD prototype was developed in two versions that were
Structure of the eastern Red Rocks and Wind Ridge thrust faults, Wyoming: how a thrust fault gains displacement along strikeĀ
Huntsman, Brent Stanley
OF FIELD MAPPING Methods . Thrust Faults . The Wind Ridge Thrust Fault System The Red Rocks Thrust Fault System CLAY MODEL STUDIES Purpose and Description Model Results DISCUSSION OF RESULTS Kinematics of the Red Rocks Thrust Fault Termination... . Kinematics of the Southern Wind Ridge Thrust Fault . . . A Conceptual Model of the Red Rocks Thrust Fault Termination Implications of the Red Rocks Fault Termination . . . . . . Page V1 V11 1X X1 X11 7 9 17 18 18 21 24 27 35 35 38 49 49...
Fault Tolerant Control using Cartesian Genetic Programming
Fernandez, Thomas
Fault Tolerant Control using Cartesian Genetic Programming Yoshikazu Hirayama University of York]: Robotics-- Sensors; F.2.2 [Analysis of Algorithms and Problem Complexity]: Nonnumerical Algorithms and Problems General Terms Algorithms, Reliability Keywords cartesian genetic programming, evolutionary
The report provides an overview of what the Smart Grid is and what is being done to define and implement it. The electric industry is preparing to undergo a transition from a centralized, producer-controlled network to a decentralized, user-interactive one. Not only will the technology involved in the electric grid change, but the entire business model of the industry will change too. A major objective of the report is to identify the changes that the Smart Grid will bring about so that industry participants can be prepared to face them. A concise overview of the development of the Smart Grid is provided. It presents an understanding of what the Smart Grid is, what new business opportunities or risks might come about due to its introduction, and what activities are already taking place regarding defining or implementing the Smart Grid. This report will be of interest to the utility industry, energy service providers, aggregators, and regulators. It will also be of interest to home/building automation vendors, information technology vendors, academics, consultants, and analysts. The scope of the report includes an overview of the Smart Grid which identifies the main components of the Smart Grid, describes its characteristics, and describes how the Smart Grid differs from the current electric grid. The overview also identifies the key concepts involved in the transition to the Smart Grid and explains why a Smart Grid is needed by identifying the deficiencies of the current grid and the need for new investment. The report also looks at the impact of the Smart Grid, identifying other industries which have gone through a similar transition, identifying the overall benefits of the Smart Grid, and discussing the impact of the Smart Grid on industry participants. Furthermore, the report looks at current activities to implement the Smart Grid including utility projects, industry collaborations, and government initiatives. Finally, the report takes a look at key technology providers involved in the Smart Grid and provides profiles on them including contact information, company overviews, technology reviews, and key Smart Grid activities.
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Protecting America And BWXT Pantex, LLC BWXT Pantex And Department of Energy National Nuclear Security Administration Pantex Site Office MEMORANDUM OF UNDERSTANDING This...
Microscopic feather fractures in the faulting process
Conrad, Robert Eugene
. Naximum compressive stress trajectories in a photoelastic model are shown by solid lines. Short lines are drawn on isoclinics in crossed polarized light at 10' intervals of rotation. Load axis is N-S. stress (o'I) trajectories curve near the fault..., maximum compressive stress, trajectories to a two dimensional during sliding along (dashed lines) in a cylindrical specimen reduced elastic problem. (b) Expected ol trajectories a fault. crack by shear along the crack surfaces (Bieniawski, 1967...
Understanding Availability Ranjita Bhagwan
Savage, Stefan
Understanding Availability Ranjita Bhagwan , Stefan Savage Ī , and Geoffrey M. Voelker of peer-to-peer systems: What does it mean when we say "availability" and how does this understanding not capture the complex time- varying nature of availability in today's peer-to-peer environments. Further, we
Fault Detection and Load Distribution for the Wind Farm Challenge
Borchehrsen, Anders B.; Larsen, Jesper A.; Stoustrup, Jakob
In this paper a fault detection system and a fault tolerant controller for a wind farm model. The wind farm model used is the one proposed as a public challenge. In the model three types of faults are introduced to a wind farm consisting of nine turbines. A fault detection system designed, by taking advantage of the fact that within a wind farm several wind turbines will be operating under all most identical conditions. The turbines are then grouped, and then turbines within each group are used to generate residuals for turbines in the group. The generated residuals are then evaluated using dynamical cumulative sum. The designed fault detection system is cable of detecting all three fault types occurring in the model. But there is room for improving the fault detection in some areas. To take advantage of the fault detection system a fault tolerant controller for the wind farm has been designed. The fault tolerant controller is a dispatch controller which is estimating the possible power at each individual turbine and then setting the reference accordingly. The fault tolerant controller has been compared to a reference controller. And the comparison shows that the fault tolerant controller performance better in all measures. The fault detection and a fault tolerant controller has been designed, and based on the simulated results the overall performance of the wind farm is improved on all measures. Thereby this is a step towards improving the overall performance of current and future wind farms.
Collateral damage: Evolution with displacement of fracture distribution and secondary fault strands in fault
Savage, Heather M.
Collateral damage: Evolution with displacement of fracture distribution and secondary fault strands in fault damage zones Heather M. Savage1,2 and Emily E. Brodsky1 Received 22 April 2010; revised 10 of fracture distributions as a function of displacement to determine whether damage around small and large
Fault-tolerant Sensor Network based on Fault Evaluation Matrix and Compensation for Intermittent Observation
Fault-tolerant Sensor Network based on Fault Evaluation Matrix and Compensation for Intermittent-tolerant sensor network configuration problem for a target navigation. A sensor network system consists of many sensor nodes and its network connections. Each sensor node can exchange information by wireless
Measuring and Modeling Fault Density for Plume-Fault Encounter Probability Estimation
Jordan, P.D.; Oldenburg, C.M.; Nicot, J.-P.
Emission of carbon dioxide from fossil-fueled power generation stations contributes to global climate change. Storage of this carbon dioxide within the pores of geologic strata (geologic carbon storage) is one approach to mitigating the climate change that would otherwise occur. The large storage volume needed for this mitigation requires injection into brine-filled pore space in reservoir strata overlain by cap rocks. One of the main concerns of storage in such rocks is leakage via faults. In the early stages of site selection, site-specific fault coverages are often not available. This necessitates a method for using available fault data to develop an estimate of the likelihood of injected carbon dioxide encountering and migrating up a fault, primarily due to buoyancy. Fault population statistics provide one of the main inputs to calculate the encounter probability. Previous fault population statistics work is shown to be applicable to areal fault density statistics. This result is applied to a case study in the southern portion of the San Joaquin Basin with the result that the probability of a carbon dioxide plume from a previously planned injection had a 3% chance of encountering a fully seal offsetting fault.
A photoelastic study of slip on an artificial fault in a multilayered medium
Coyne, John Christopher
to understand the processes associated with the generation of earthquakes, a knowledge of the physical parameters governing the resistance to slip along pr e- existing faults is required. The significance and location of these phenomena must be determined so.../Displacement Curve Homogeneous Nodel Idealized Force/Displacement Curve Principal Stress Trajectories and Maximum Shear Stress Contours Homogeneous Model, Stage I Principal Stress Trajectories and Maximum Shear Stress Contours Homogeneous Model, Stage II Farce...
Fault Locating, Prediction and Protection (FLPPS)
Yinger, Robert, J.; Venkata, S., S.; Centeno, Virgilio
One of the main objectives of this DOE-sponsored project was to reduce customer outage time. Fault location, prediction, and protection are the most important aspects of fault management for the reduction of outage time. In the past most of the research and development on power system faults in these areas has focused on transmission systems, and it is not until recently with deregulation and competition that research on power system faults has begun to focus on the unique aspects of distribution systems. This project was planned with three Phases, approximately one year per phase. The first phase of the project involved an assessment of the state-of-the-art in fault location, prediction, and detection as well as the design, lab testing, and field installation of the advanced protection system on the SCE Circuit of the Future located north of San Bernardino, CA. The new feeder automation scheme, with vacuum fault interrupters, will limit the number of customers affected by the fault. Depending on the fault location, the substation breaker might not even trip. Through the use of fast communications (fiber) the fault locations can be determined and the proper fault interrupting switches opened automatically. With knowledge of circuit loadings at the time of the fault, ties to other circuits can be closed automatically to restore all customers except the faulted section. This new automation scheme limits outage time and increases reliability for customers. The second phase of the project involved the selection, modeling, testing and installation of a fault current limiter on the Circuit of the Future. While this project did not pay for the installation and testing of the fault current limiter, it did perform the evaluation of the fault current limiter and its impacts on the protection system of the Circuit of the Future. After investigation of several fault current limiters, the Zenergy superconducting, saturable core fault current limiter was selected for installation. Because of some testing problems with the Zenergy fault current limiter, installation was delayed until early 2009 with it being put into operation on March 6, 2009. A malfunction of the FCL controller caused the DC power supply to the superconducting magnet to be turned off. This inserted the FCL impedance into the circuit while it was in normal operation causing a voltage resonance condition. While these voltages never reached a point where damage would occur on customer equipment, steps were taken to insure this would not happen again. The FCL was reenergized with load on December 18, 2009. A fault was experienced on the circuit with the FCL in operation on January 14, 2010. The FCL operated properly and reduced the fault current by about 8%, what was expected from tests and modeling. As of the end of the project, the FCL was still in operation on the circuit. The third phase of the project involved the exploration of several advanced protection ideas that might be at a state where they could be applied to the Circuit of the Future and elsewhere in the SCE electrical system. Based on the work done as part of the literature review and survey, as well as a number of internal meetings with engineering staff at SCE, a number of ideas were compiled. These ideas were then evaluated for applicability and ability to be applied on the Circuit of the Future in the time remaining for the project. Some of these basic ideas were implemented on the circuit including measurement of power quality before and after the FCL. It was also decided that we would take what was learned as part of the Circuit of the Future work and extend it to the next generation circuit protection for SCE. Also at this time, SCE put in a proposal to the DOE for the Irvine Smart Grid Demonstration using ARRA funding. SCE was successful in obtaining funding for this proposal, so it was felt that exploration of new protection schemes for this Irvine Smart Grid Demonstration would be a good use of the project resources. With this in mind, a protection system that uses fault interrupting switches, hi
Nuclear power plant fault-diagnosis using artificial neural networks
Kim, Keehoon; Aljundi, T.L.; Bartlett, E.B.
Artificial neural networks (ANNs) have been applied to various fields due to their fault and noise tolerance and generalization characteristics. As an application to nuclear engineering, we apply neural networks to the early recognition of nuclear power plant operational transients. If a transient or accident occurs, the network will advise the plant operators in a timely manner. More importantly, we investigate the ability of the network to provide a measure of the confidence level in its diagnosis. In this research an ANN is trained to diagnose the status of the San Onofre Nuclear Generation Station using data obtained from the plant's training simulator. Stacked generalization is then applied to predict the error in the ANN diagnosis. The data used consisted of 10 scenarios that include typical design basis accidents as well as less severe transients. The results show that the trained network is capable of diagnosing all 10 instabilities as well as providing a measure of the level of confidence in its diagnoses.
Faulted joints: kinematics, displacementlength scaling relations and criteria for their identication
Engelder, Terry
and kinematics based on two sets of joints, pinnate joints and fault striations, reveal that some mesoscale faults (i.e., faults without linked fault segments) at the mesoscale: ¬neoformed faults║ which form
Robust Condition Monitoring and Fault Diagnosis of Variable Speed Induction Motor Drives
Choi, Seungdeog
The main types of faults studied in the literature are commonly categorized as electrical faults and mechanical faults. In addition to well known faults, the performance of a diagnostic algorithm and its operational reliability in harsh environments...
A Hybrid Model Based and Statistical Fault Diagnosis System for Industrial Process
Lin, Chen-Han
This thesis presents a hybrid model based and statistical fault diagnosis system, which applied on the nonlinear three-tank model. The purpose of fault diagnosis is generating and analyzing the residual to find out the fault occurrence. This fault...
Understanding Crude Oil Prices
Hamilton, James Douglas
2004. ōOPECÆs Optimal Crude Oil Price,ö Energy Policy 32(2),percent change in real oil price. Figure 3. Price of crude023 Understanding Crude Oil Prices James D. Hamilton June
Understanding Blood Pressure Ę Monitorathomewithadigitalmonitor. Ę Useleftarmwithcorrectsizecuff. Ę Avoidcaffeine,alcohol,andtobacco. Steps to Follow FOR AN ACCURATE MEASUREMENT Blood pressure is the measurement of the force of blood on the walls of the arteries. Bottom number = Diastolic (force between heart beats) Top
Watson, Andrew
UNDERSTANDING HOME RENOVATION DECISIONS - A Research Project - Background to Our Research Energy to renovate their homes. We're interested in energy efficiency, but in all other efficient renova/ons can lower energy bills, improve comfort by reducing dra
Building Decision Trees for Characteristic Ellipsoid Method to Monitor Power System Transient Behaviors
Ma, Jian; Diao, Ruisheng; Makarov, Yuri V.; Etingov, Pavel V.; Zhou, Ning; Dagle, Jeffery E.
The characteristic ellipsoid is a new method to monitor the dynamics of power systems. Decision trees (DTs) play an important role in applying the characteristic ellipsoid method to system operation and analysis. This paper presents the idea and initial results of building DTs for detecting transient dynamic events using the characteristic ellipsoid method. The objective is to determine fault types, fault locations and clearance time in the system using decision trees based on ellipsoids of system transient responses. The New England 10-machine 39-bus system is used for running dynamic simulations to generate a sufficiently large number of transient events in different system configurations. Comprehensive transient simulations considering three fault types, two fault clearance times and different fault locations were conducted in the study. Bus voltage magnitudes and monitored reactive and active power flows are recorded as the phasor measurements to calculate characteristic ellipsoids whose volume, eccentricity, center and projection of the longest axis are used as indices to build decision trees. The DT performances are tested and compared by considering different sets of PMU locations. The proposed method demonstrates that the characteristic ellipsoid method is a very efficient and promising tool to monitor power system dynamic behaviors.
Two-phase unsaturated flow at Yucca Mountain, Nevada - A Report on Current Understanding
Pruess, K.
The U.S. civilian nuclear waste program is unique in its focus on disposal of high-level wastes in the unsaturated zone (UZ), above the water table. The potential repository site currently under investigation is located in a semi-arid region of the southwestern U.S. at Yucca Mountain, Nevada. The geology of the site consists of layered sequences of faulted, fractured, and bedded tuffs. The groundwater table is approximately 600 m beneath the land surface, while the proposed repository horizon is at a nominal depth of approximately 375 m. In this kind of environment, two-phase flow is not just a localized perturbation to natural conditions, as in the saturated zone, but is the predominant mode of water and gas flow. The purpose of this report is to review the current understanding of gas and water flow, and mass transport, in the unique hydrogeologic environment of Yucca Mountain. Characteristics of the Yucca Mountain site are examined, and concepts and mathematical modeling approaches are described for variably saturated flow in thick unsaturated zones of fractured rock. The paper includes a brief summary of the disposal concept and repository design, as developed by a team of engineering contractors to the U.S. Department of Energy (DOE), with strong participation from the DOE National Laboratories.
Synthesis and evaluation of fault-tolerant quantum computer architectures
Cross, Andrew W. (Andrew William), 1979-
Fault-tolerance is the cornerstone of practical, large-scale quantum computing, pushed into its prominent position with heroic theoretical efforts. The fault-tolerance threshold, which is the component failure probability ...
Wickerhauser, M. Victor
two photo detectors. The distances are the distance from the actual position of the OPU such surface faults. The core idea is not to rely on sensor information during the fault. The sensor signals
Observations on the capability of the Criner fault, southern Oklahoma
Williamson, Shawn Collin
of the present study suggest that the Criner fault is an old tectonic feature with a deceptively youthful geomorphic appearance. Differential erosion has likely exhumed the Criner fault-line scarp in the resistant Ordovician limestone of the Criner Hills...
Design and analysis of a fault tolerant network processor
Desai, Shaishav A
This thesis investigates the effect of transient faults on a processor and proposes on-chip fault tolerant design techniques to improve its reliability. The target processor is a general 32-bit, four stage pipeline, dual context RISC style design...
Frictional properties of faults: from observation on the
Winfree, Erik
Frictional properties of faults: from observation on the Longitudinal Valley Fault, Taiwan myself lucky to do what I love and to wake up every day, happy and excited about the day to come
East-west faults due to planetary contraction
Beuthe, Mikael
Contraction, expansion and despinning have been common in the past evolution of Solar System bodies. These processes deform the lithosphere until it breaks along faults. The type and orientation of faults are usually determined under the assumption of a constant lithospheric thickness, but lithospheric thinning can occur at the equator or at the poles due either to latitudinal variation in solar insolation or to localized tidal dissipation. Using thin elastic shells with variable thickness, I show that the equatorial thinning of the lithosphere transforms the homogeneous and isotropic fault pattern caused by contraction/expansion into a pattern of faults striking east-west, preferably formed in the equatorial region. By contrast, lithospheric thickness variations only weakly affect the despinning faulting pattern consisting of equatorial strike-slip faults and polar normal faults. If contraction is added to despinning, the despinning pattern first shifts to thrust faults striking north-south and then to thrus...
New approach to the fault location problem using synchronized sampling
Mrkic, Jasna
This thesis presents a new approach to solving the problem of fault location on a transmission line using synchronized data from both ends of the line. The synchronized phase voltage and current samples taken during the fault transient are used...
VCSEL fault location apparatus and method
Keeler, Gordon A. (Albuquerque, NM); Serkland, Darwin K. (Albuquerque, NM)
An apparatus for locating a fault within an optical fiber is disclosed. The apparatus, which can be formed as a part of a fiber-optic transmitter or as a stand-alone instrument, utilizes a vertical-cavity surface-emitting laser (VCSEL) to generate a test pulse of light which is coupled into an optical fiber under test. The VCSEL is subsequently reconfigured by changing a bias voltage thereto and is used as a resonant-cavity photodetector (RCPD) to detect a portion of the test light pulse which is reflected or scattered from any fault within the optical fiber. A time interval .DELTA.t between an instant in time when the test light pulse is generated and the time the reflected or scattered portion is detected can then be used to determine the location of the fault within the optical fiber.
Fault seal analysis of Okan and Meren fields, Nigeria
Eisenberg, R.A. [Chevron Petroleum Technology Co., La Habra, CA (United States); Brenneman, R.J. [Chevron Overseas Petroleum Co., San Ramon, CA (United States); Adeogba, A.A. [Chevron Nigeria Ltd., Lagos (Nigeria)
The sealing capacity and the dynamic seal behavior of faults between juxtaposed reservoirs were analyzed for Okan and Meren fields, offshore Nigeria. In both fields correlations were found between reservoir performance, juxtaposed fluid types, oil geochemistry, interpreted fluid contact relationships, fault sealing/leaking condition, and calculated smear gouge ratios. Integration of these data has been invaluable in quantifying fault seal risk and may effect depletion strategies for fault-juxtaposed reservoirs within these fields. Fault plane sections defined reservoir juxtapositions and aided visualization of potential cross-fault spill points. Smear gouge ratios calculated from E-logs were used to estimate the composition of fault-gouge materials between the juxtaposed reservoirs. These tools augmented interpretation of seal/nonseal character based on fluid contact relationships in proved reservoirs and, in addition, were used to quantify fault seal risk of untested fault-dependent closures in Okan. The results of these analyses were then used to interpret production-induced fault seal breakdown within the G-sands and also to risk seal integrity of fault dependent closures within the untested O-sands in an adjacent, upthrown fault block. Within this fault block the presence of potential fault intersection leak points and large areas of sand/sand juxtaposition with high smear gouge ratios (low sealing potential) limits potential reserves within the O-sand package. In Meren Field the E- and G-sands are juxtaposed, on different pressure decline, geochemically distinct, and are characterized by low smear gouge ratios. In contrast, specific G- and H-sands, juxtaposed across the same fault, contain similar OOWCs and are characterized by high smear gouge ratios. The cross-sealing and/or cross-leaking nature of compartment boundaries at Meren is related to fault displacement variation and the composition of displaced stratigraphy.
Detachment Faulting & Geothermal Resources- Pearl Hot Spring, NV
Broader source: Energy.gov [DOE]
Detachment Faulting & Geothermal Resources - Pearl Hot Spring, NV presentation at the April 2013 peer review meeting held in Denver, Colorado.
Experimental wrench faulting at confining pressure
Bartlett, Wendy Louise
along the precut, resembling the "flower or palm tree" structure noted by Sylvester and Smith (1976), in the Salton Sea area, California. The bounding fault above the down-dropped block dips at a lower angle to the forcing block-veneer interface than..., the oeometries, ori- gins, and sequence of development of structural elements comprising the fault zones. Specimens (2. 8 or 3. 4 x 3. 4 x 9. 4 cm) are loaded parallel to their longest dimension, at an average displacement rate -3 -1 of 7. 3 x 10 cm sec...
Boyer, Edmond
1 UNSUPERVISED CLUSTERING FOR FAULT DIAGNOSIS IN NUCLEAR POWER PLANT COMPONENTS Piero Baraldi1 of prototypical behaviors. Its performance is tested with respect to an artificial case study and then applied on transients originated by different faults in the pressurizer of a nuclear power reactor. Key Words: Fault
On Distributed Fault-Tolerant Detection in Wireless Sensor Networks
Huang, Yinlun
On Distributed Fault-Tolerant Detection in Wireless Sensor Networks Xuanwen Luo, Student Member problems for distributed fault-tolerant detection in wireless sensor networks: 1) how to address both it possible to perform energy- efficient fault-tolerant detection in a wireless sensor network. Index Terms
Outlier Detection Rules for Fault Detection in Solar Photovoltaic Arrays
Lehman, Brad
, MPPT of the PV inverters, high fault impedance, or degradation of solar cells [1]. Without proper fault Abstract-- Solar photovoltaic (PV) arrays are unique power sources that may have uncleared fault current when utilizing conventional overcurrent protection devices. To monitor the PV operation and detect
A Parametric Spectral Estimator for Faults Detection in Induction Machines
Boyer, Edmond
since their frequency resolution is limited and additional post-processing algorithms are required of bearing faults. Index Terms--Induction machine, faults detection, bearing faults, stator current that avoids the use of extra sensors since the stator currents are usually available and inexpensive
RISž-M-2311 AUTOMATIC FAULT TREE CONSTRUCTION WITH RIKKE A COMPENDIUM OF EXAMPLES, VOLUME I BASIC MODELS J.R. Taylor Abstract. Examples of automatically constructed fault trees are given. In this first are intended to illustrate the prin- ciples of fault tree construction using the RIKKE failure analysis system
Ris-M-2311 AUTOMATIC FAULT TREE CONSTRUCTION WITH RIKKE
Ris°-M-2311 Vol. 2 AUTOMATIC FAULT TREE CONSTRUCTION WITH RIKKE A COMPENDIUM OF EXAMPLES. VOLUME 2. CONTROL AND SAFETY LOOPS. J.R. Taylor Abstract. This second volume describes the construction of fault In this volume, examples of HIKKE fault tree construction including loops are given. The principles involved were
Statistical estimation of multiple faults in aircraft gas turbine engines
Ray, Asok
415 Statistical estimation of multiple faults in aircraft gas turbine engines S Sarkar, C Rao of multiple faults in aircraft gas-turbine engines, based on a statistical pattern recognition tool called commercial aircraft engine. Keywords: aircraft propulsion, gas turbine engines, multiple fault estimation
Identifying Security Fault Reports via Text Mining Michael Gegick, 2
Young, R. Michael
Identifying Security Fault Reports via Text Mining 1 Michael Gegick, 2 Pete Rotella, 1 Tao Xie 1 contains fault reports (FRs) collected from various sources such as development teams, test teams, and end-users. Software or security engineers manually analyze the FRs to label the subset of FRs that are security fault
Diverse neural net solutions to a fault diagnosis problem \\Lambda
Sharkey, Amanda
Abstract The development of a neural net system for fault diagnosis in a mar┬Ł ine diesel engine system solution to a problem of fault diagnosis in a four┬Łstroke marine diesel engine; that of early to recognise faults in simulated data from a diesel engine; specifically to classify combustion condition
Understanding Forage Quality Analysis
Stokes, Sandra R.; Prostko, Eric P.
Understanding Forage Quality Analysis Sandra R. Stokes and Eric P. Prostko* L-5198 3-98 M any dairy producers in Texas do not have the land to grow their own forages. Consequent- ly, they rely on both local and out-of-state farmers for supplies...
An algorithm for faulted phase and feeder selection under high impedance fault conditionsĀ
Benner, Carl Lee
. One method based on increases in third and fifth harmonic symmetrical current components under high impedance fault conditions has been proposed by Balser et. Journal model is IEEE Transactions on Power Delivery. al, of Power Technologies Inc [1...
Realistic fault modeling and quality test generation of combined delay faults
Thadhlani, Ajaykumar A
coupled lines. To cope up with these realistic testing problems, it is necessary to model the circuit defects by considering the capacitively coupling between lines. This needs a better fault model which can incorporate the local defects (such...
Seismoelectric Imaging of a Shallow Fault System Employing Fault Guided Waves
Cohrs, Frelynn Joseph Reese
Independent sets of reflection seismic and seismoelectric data were collected, processed, and interpreted with the aim of generating and studying guided waves within a fault zone. While seismic surveys have recently been utilized to investigate...
Clay fabric intensity in natural and artificial fault gouges: Implications for brittle fault zone processes and sedimentary
Clay fabric intensity in natural and artificial fault gouges: Implications for brittle fault zone processes and sedimentary basin clay fabric evolution Samuel H. Haines,1 Ben A. van der Pluijm,1 Matt J intensity measurements using X-ray texture goniometry on 22 natural clay-rich fault gouges from low
We develop a microprocessor design that tolerates hard faults, including fabrication defects and in-field faults,
Sorin, Daniel J.
1 Abstract We develop a microprocessor design that tolerates hard faults, including fabrication defects and in-field faults, by leveraging existing microprocessor redundancy. To do this, we must: detect FDUs with hard faults. In our reliable microprocessor design, we use DIVA dynamic verification
Thermal anomaly near the Aigio fault, Gulf of Corinth, Greece, maybe due to convection below the fault
Thermal anomaly near the Aigio fault, Gulf of Corinth, Greece, maybe due to convection below intersecting the active Aigio fault, Corinth Rift, Greece. The heat flow is 53 mW/m2 , indicating of Corinth, Greece, maybe due to convection below the fault, Geophys. Res. Lett., 34, L06314, doi:10
Fault Tolerant CORBASpecification, OMG document: ptc/20000404
Roma "La Sapienza", UniversitÓ di
Fault Tolerant CORBASpecification, V1.0 OMG document: ptc/2000Ł04Ł04 replaces draft adopted specification ptc/2000Ł03Ł04 and submission document orbos/00Ł01Ł19 This document is an OMG Final Adopted in the finalization phase. Comments on the content of this document are welcomed, and should be directed to issues
All row, planar fault detection system
Archer, Charles Jens; Pinnow, Kurt Walter; Ratterman, Joseph D; Smith, Brian Edward
An apparatus, program product and method for detecting nodal faults may simultaneously cause designated nodes of a cell to communicate with all nodes adjacent to each of the designated nodes. Furthermore, all nodes along the axes of the designated nodes are made to communicate with their adjacent nodes, and the communications are analyzed to determine if a node or connection is faulty.
Multi-directional fault detection system
Archer, Charles Jens (Rochester, MN); Pinnow, Kurt Walter (Rochester, MN); Ratterman, Joseph D. (Rochester, MN); Smith, Brian Edward (Rochester, MN)
An apparatus, program product and method checks for nodal faults in a group of nodes comprising a center node and all adjacent nodes. The center node concurrently communicates with the immediately adjacent nodes in three dimensions. The communications are analyzed to determine a presence of a faulty node or connection.
Multi-directional fault detection system
Archer, Charles Jens; Pinnow, Kurt Walter; Ratterman, Joseph D.; Smith, Brian Edward
An apparatus, program product and method checks for nodal faults in a group of nodes comprising a center node and all adjacent nodes. The center node concurrently communicates with the immediately adjacent nodes in three dimensions. The communications are analyzed to determine a presence of a faulty node or connection.
Global Trajectory Planning for Fault Tolerant Manipulators
. Khosla Department of Electrical and Computer Engineering and The Robotics Institute, Carnegie Mellon attribute of robot manipulators in a growing range of applications such as space missions, nuclear waste retrieval, and medical robot┬Ł ics. This trend has spawned a research effort in fault toler┬Ł ant robotics
Fault-tolerant, Universal Adiabatic Quantum Computation
Ari Mizel
Quantum computation has revolutionary potential for speeding computational tasks such as factoring and simulating quantum systems, but the task of constructing a quantum computer is daunting. Adiabatic quantum computation and other ``hands-off" approaches relieve the need for rapid, precise pulsing to control the system, inspiring at least one high-profile effort to realize a hands-off quantum computing device. But is hands-off incompatible with fault-tolerant? Concerted effort and many innovative ideas have not resolved this question but have instead deepened it, linking it to fundamental problems in quantum complexity theory. Here we present a hands-off approach that is provably (a) capable of scalable universal quantum computation in a non-degenerate ground state and (b) fault-tolerant against an analogue of the usual local stochastic fault model. A satisfying physical and numerical argument indicates that (c) it is also fault-tolerant against thermal excitation below a threshold temperature independent of the computation size.
54 MAY | 2012 Gearbox Fault Detection
Kusiak, Andrew
, research in fault identification and condition monitoring is war- ranted. In this study, detecting wind of a test wind turbine. The gearbox was retested at the Dynamometer Test Facility (DTF) at NREL. To retest the gearbox, the complete nacelle, and the drive train of the test wind turbine were installed at the DTF
Fault-tolerant quantum computation by anyons
A. Yu. Kitaev
A two-dimensional quantum system with anyonic excitations can be considered as a quantum computer. Unitary transformations can be performed by moving the excitations around each other. Measurements can be performed by joining excitations in pairs and observing the result of fusion. Such computation is fault-tolerant by its physical nature.
Fault-Tolerant Spanners: Better and Simpler
Dinitz, Michael
A natural requirement of many distributed structures is fault-tolerance: after some failures, whatever remains from the structure should still be effective for whatever remains from the network. In this paper we examine spanners of general graphs that are tolerant to vertex failures, and significantly improve their dependence on the number of faults $r$, for all stretch bounds. For stretch $k \\geq 3$ we design a simple transformation that converts every $k$-spanner construction with at most $f(n)$ edges into an $r$-fault-tolerant $k$-spanner construction with at most $O(r^3 \\log n) \\cdot f(2n/r)$ edges. Applying this to standard greedy spanner constructions gives $r$-fault tolerant $k$-spanners with $\\tilde O(r^{2} n^{1+\\frac{2}{k+1}})$ edges. The previous construction by Chechik, Langberg, Peleg, and Roddity [STOC 2009] depends similarly on $n$ but exponentially on $r$ (approximately like $k^r$). For the case $k=2$ and unit-length edges, an $O(r \\log n)$-approximation algorithm is known from recent work of D...
Probabilistic model of fault detection in quantum circuits
Anindita Banerjee; Anirban Pathak
It is shown that the fault testing for quantum circuits does not follow conventional classical techniques. If probabilistic gate like Hadamard gate is included in a circuit then the classical notion of test vector is shown to fail. We have reported several new and distinguishing features of quantum fault and also presented a general methodology for detection of functional faults in a quantum circuit. The technique can generate test vectors for detection of different kinds of fault. Specific examples are given and time complexity of the proposed quantum fault detection algorithm is reported.
A Comparison Between Data Mining Prediction Algorithms for Fault Detection(Case study: Ahanpishegan co.)
Amooee, Golriz; Bagheri-Dehnavi, Malihe
In the current competitive world, industrial companies seek to manufacture products of higher quality which can be achieved by increasing reliability, maintainability and thus the availability of products. On the other hand, improvement in products lifecycle is necessary for achieving high reliability. Typically, maintenance activities are aimed to reduce failures of industrial machinery and minimize the consequences of such failures. So the industrial companies try to improve their efficiency by using different fault detection techniques. One strategy is to process and analyze previous generated data to predict future failures. The purpose of this paper is to detect wasted parts using different data mining algorithms and compare the accuracy of these algorithms. A combination of thermal and physical characteristics has been used and the algorithms were implemented on Ahanpishegan's current data to estimate the availability of its produced parts. Keywords: Data Mining, Fault Detection, Availability, Predictio...
Combined expert system/neural networks method for process fault diagnosis
Reifman, J.; Wei, T.Y.C.
A two-level hierarchical approach for process fault diagnosis of an operating system employs a function-oriented approach at a first level and a component characteristic-oriented approach at a second level, where the decision-making procedure is structured in order of decreasing intelligence with increasing precision. At the first level, the diagnostic method is general and has knowledge of the overall process including a wide variety of plant transients and the functional behavior of the process components. An expert system classifies malfunctions by function to narrow the diagnostic focus to a particular set of possible faulty components that could be responsible for the detected functional misbehavior of the operating system. At the second level, the diagnostic method limits its scope to component malfunctions, using more detailed knowledge of component characteristics. Trained artificial neural networks are used to further narrow the diagnosis and to uniquely identify the faulty component by classifying the abnormal condition data as a failure of one of the hypothesized components through component characteristics. Once an anomaly is detected, the hierarchical structure is used to successively narrow the diagnostic focus from a function misbehavior, i.e., a function oriented approach, until the fault can be determined, i.e., a component characteristic-oriented approach. 9 figs.
Combined expert system/neural networks method for process fault diagnosis
Reifman, Jaques (Westchester, IL); Wei, Thomas Y. C. (Downers Grove, IL)
A two-level hierarchical approach for process fault diagnosis is an operating system employs a function-oriented approach at a first level and a component characteristic-oriented approach at a second level, where the decision-making procedure is structured in order of decreasing intelligence with increasing precision. At the first level, the diagnostic method is general and has knowledge of the overall process including a wide variety of plant transients and the functional behavior of the process components. An expert system classifies malfunctions by function to narrow the diagnostic focus to a particular set of possible faulty components that could be responsible for the detected functional misbehavior of the operating system. At the second level, the diagnostic method limits its scope to component malfunctions, using more detailed knowledge of component characteristics. Trained artificial neural networks are used to further narrow the diagnosis and to uniquely identify the faulty component by classifying the abnormal condition data as a failure of one of the hypothesized components through component characteristics. Once an anomaly is detected, the hierarchical structure is used to successively narrow the diagnostic focus from a function misbehavior, i.e., a function oriented approach, until the fault can be determined, i.e., a component characteristic-oriented approach.
Understanding Lustre Internals
Wang, Feiyi [ORNL; Oral, H Sarp [ORNL; Shipman, Galen M [ORNL; Drokin, Oleg [ORNL; Wang, Di [ORNL; Huang, He [ORNL
Lustre was initiated and funded, almost a decade ago, by the U.S. Department of Energy (DoE) Office of Science and National Nuclear Security Administration laboratories to address the need for an open source, highly-scalable, high-performance parallel filesystem on by then present and future supercomputing platforms. Throughout the last decade, it was deployed over numerous medium-to-large-scale supercomputing platforms and clusters, and it performed and met the expectations of the Lustre user community. As it stands at the time of writing this document, according to the Top500 list, 15 of the top 30 supercomputers in the world use Lustre filesystem. This report aims to present a streamlined overview on how Lustre works internally at reasonable details including relevant data structures, APIs, protocols and algorithms involved for Lustre version 1.6 source code base. More importantly, it tries to explain how various components interconnect with each other and function as a system. Portions of this report are based on discussions with Oak Ridge National Laboratory Lustre Center of Excellence team members and portions of it are based on our own understanding of how the code works. We, as the authors team bare all responsibilities for all errors and omissions in this document. We can only hope it helps current and future Lustre users and Lustre code developers as much as it helped us understanding the Lustre source code and its internal workings.
Completing fault models for abductive diagnosis
Knill, E. (Los Alamos National Lab., NM (United States)); Cox, P.T.; Pietrzykowski, T. (Technical Univ., NS (Canada))
In logic-based diagnosis, the consistency-based method is used to determine the possible sets of faulty devices. If the fault models of the devices are incomplete or nondeterministic, then this method does not necessarily yield abductive explanations of system behavior. Such explanations give additional information about faulty behavior and can be used for prediction. Unfortunately, system descriptions for the consistency-based method are often not suitable for abductive diagnosis. Methods for completing the fault models for abductive diagnosis have been suggested informally by Poole and by Cox et al. Here we formalize these methods by introducing a standard form for system descriptions. The properties of these methods are determined in relation to consistency-based diagnosis and compared to other ideas for integrating consistency-based and abductive diagnosis.
Stuck-at-fault test set compaction
Vanfickell, Jason Michael
of sltcp g(0. 5-ones~robo~, ~) Exc Bal, = 0. 25 ? of sites Figure 1. Formula for computation of the excitation balance Excitation balance is a metric computed for every detectable fault in the entire circuit. It is intended to provide a measure... Sigma ~ National Society of Collegiate Scholars Activities: ~ Texas A&M University Institute of Electrical and Electronic Engineers IT/Technology Chair and Webmaster, Fall 2003 ? Spring 2004 ~ Texas A&M University Student Engineers' Council...
Undulator Hall Air Temperature Fault Scenarios
Sevilla, J.; Welch, J.; /SLAC; ,
Recent experience indicates that the LCLS undulator segments must not, at any time following tuning, be allowed to change temperature by more than about {+-}2.5 C or the magnetic center will irreversibly shift outside of acceptable tolerances. This vulnerability raises a concern that under fault conditions the ambient temperature in the Undulator Hall might go outside of the safe range and potentially could require removal and retuning of all the segments. In this note we estimate changes that can be expected in the Undulator Hall air temperature for three fault scenarios: (1) System-wide power failure; (2) Heating Ventilation and Air Conditioning (HVAC) system shutdown; and (3) HVAC system temperature regulation fault. We find that for either a system-wide power failure or an HVAC system shutdown (with the technical equipment left on), the short-term temperature changes of the air would be modest due to the ability of the walls and floor to act as a heat ballast. No action would be needed to protect the undulator system in the event of a system-wide power failure. Some action to adjust the heat balance, in the case of the HVAC power failure with the equipment left on, might be desirable but is not required. On the other hand, a temperature regulation failure of the HVAC system can quickly cause large excursions in air temperature and prompt action would be required to avoid damage to the undulator system.
Fault Impacts on Solar Power Unit Reliability Ali M. Bazzi, Katherine A. Kim, Brian B. Johnson, Philip T. Krein, and Alejandro Dominguez-Garca
Liberzon, Daniel
reliability, solar power unit, reliability modeling procedure. I. INTRODUCTION Photovoltaic (PV) powerFault Impacts on Solar Power Unit Reliability Ali M. Bazzi, Katherine A. Kim, Brian B. Johnson a generalized reliability model of a solar power unit (SPU) based on physical characteristics including material
Pressure test data reveal reservoir barriers/faults
Hurd, J.D.
A review of transient pressure test data from an oil reservoir in Libya indicated not only the suspected fault barriers, but also the non-sealing portions of the faults. Extensive seismic data indicated much faulting, and directional trends had been interpreted to be generally northwest-southeast. The reservoir is a heterogeneous dolomite with average permeability of 40 to 50 md and contains neither natural fractures not stratification. Vertical displacement (throw) of each fault block is indicated to be within the range of the dolomite thickness, i.e., 40 to 180 ft. Therefore, when the fault throw is greater than reservoir thickness there is sealing, and when the throw is less than reservoir thickness the faults are non-sealing.
Similarity Matching Techniques for Fault Diagnosis in Automotive Infotainment Electronics
Kabir, Mashud
Fault diagnosis has become a very important area of research during the last decade due to the advancement of mechanical and electrical systems in industries. The automobile is a crucial field where fault diagnosis is given a special attention. Due to the increasing complexity and newly added features in vehicles, a comprehensive study has to be performed in order to achieve an appropriate diagnosis model. A diagnosis system is capable of identifying the faults of a system by investigating the observable effects (or symptoms). The system categorizes the fault into a diagnosis class and identifies a probable cause based on the supplied fault symptoms. Fault categorization and identification are done using similarity matching techniques. The development of diagnosis classes is done by making use of previous experience, knowledge or information within an application area. The necessary information used may come from several sources of knowledge, such as from system analysis. In this paper similarity matching tec...
Investigation of the Meers fault in southwestern Oklahoma
Luza, K.V.; Madole, R.F.; Crone, A.J.
The Meers fault is part of a major system of NW-trending faults that form the boundary between the Wichita Mountains and the Anadarko basin in southwestern Oklahoma. A portion of the Meers fault is exposed at the surface in northern Comanche County and strikes approximately N. 60/sup 0/ W. where it offsets Permian conglomerate and shale for at least 26 km. The scarp on the fault is consistently down to the south, with a maximum relief of 5 m near the center of the fault trace. Quaternary stratigraphic relationships and 10 /sup 14/C age dates constrain the age of the last movement of the Meers fault. The last movement postdates the Browns Creek Alluvium, late Pleistocene to early Holocene, and predates the East Cache Alluvium, 100 to 800 yr B.P. Fan alluvium, produced by the last fault movement, buried a soil that dates between 1400 and 1100 yr B.P. Two trenches excavated across the scarp near Canyon Creek document the near-surface deformation and provide some general information on recurrence. Trench 1 was excavated in the lower Holocene part of the Browns Creek Alluvium, and trench 2 was excavated in unnamed gravels thought to be upper Pleistocene. Flexing and warping was the dominant mode of deformation that produced the scarp. The stratigraphy in both trenches indicates one surface-faulting event, which implies a lengthy recurrence interval for surface faulting on this part of the fault. Organic-rich material from two samples that postdate the last fault movement yielded /sup 14/C ages between 1600 and 1300 yr B.P. These dates are in excellent agreement with the dates obtained from soils buried by the fault-related fan alluvium.
A Turing Machine Resisting Isolated Bursts Of Faults
Capuni, Ilir
We consider computations of a Turing machine under noise that causes consecutive violations of the machine's transition function. Given a constant upper bound B on the size of bursts of faults, we construct a Turing machine M(B) subject to faults that can simulate any fault-free machine under the condition that bursts are not closer to each other than V for an appropriate V = O(B^2).
(m,n)-Semirings and a Generalized Fault Tolerance Algebra of Systems
Syed Eqbal Alam; Shrisha Rao; Bijan Davvaz
We propose a new class of mathematical structures called (m,n)-semirings} (which generalize the usual semirings), and describe their basic properties. We also define partial ordering, and generalize the concepts of congruence, homomorphism, ideals, etc., for (m,n)-semirings. Following earlier work by Rao, we consider a system as made up of several components whose failures may cause it to fail, and represent the set of systems algebraically as an (m,n)-semiring. Based on the characteristics of these components we present a formalism to compare the fault tolerance behaviour of two systems using our framework of a partially ordered (m,n)-semiring.
Upper crustal faulting in an obliquely extending orogen, structural...
faulting in an obliquely extending orogen, structural control on permeability and production in the Coso Geothermal Field, eastern California Jump to: navigation, search OpenEI...
Active Fault Controls At High-Temperature Geothermal Sites- Prospectin...
the level of unrecognized active faults present in these areas. Analysis of low-sun-angle aerial photography acquired over the Needle Rocks, Astor Pass, Empire, and Lee...
Fault-tolerant distributed transactions for partitioned OLTP databases
Jones, Evan P. C. (Evan Philip Charles), 1981-
This thesis presents Dtxn, a fault-tolerant distributed transaction system designed specifically for building online transaction processing (OLTP) databases. Databases have traditionally been designed as general purpose ...
atera fault central: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
deformation and creep along the central section of the North Anatolian Fault (Turkey): InSAR observations Geosciences Websites Summary: Interseismic deformation and creep...
Checksum-Based Fault Tolerance for LU Factorization
Davies, Teresa
study of failures in high-performance computing systems. InFault tolerant high performance computing by a codingfor large-scale high- performance computing. In 2012
PV Arc Fault Detector Challenges Due to Module Frequency Response...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
This poster does not contain any proprietary or confidential information. Introduction PV system arc faults have led to a number of rooftop fires which have caused significant...
Dating of major normal fault systems using thermochronology-...
faults, timing of ductile mylonite formation and passage of rocks through the crystal-plastic to brittle transition, and multiple events of extensional unroofing. Here we...
GETHERMAL FIELD, CALIFORNIA Jump to: navigation, search OpenEI Reference LibraryAdd to library Conference Proceedings: MICRO-SEISMICITY, FAULT STRUCTURE AND HYDRAULIC...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
PHOTOVOLTAIC DC ARC FAULT DETECTOR TESTING AT SANDIA NATIONAL LABORATORIES Jay Johnson 1 , Birger Pahl 2 , Charles Luebke 2 , Tom Pier 2 , Theodore Miller 3 , Jason Strauch 1 ,...
Fault tolerant Quantum Information Processing with Holographic control
G. A. Paz-Silva; G. K. Brennen; J. Twamley
We present a fault-tolerant semi-global control strategy for universal quantum computers. We show that N-dimensional array of qubits where only (N-1)-dimensional addressing resolution is available is compatible with fault-tolerant universal quantum computation. What is more, we show that measurements and individual control of qubits are required only at the boundaries of the fault-tolerant computer, i.e. holographic fault-tolerant quantum computation. Our model alleviates the heavy physical conditions on current qubit candidates imposed by addressability requirements and represents an option to improve their scalability.
Fault Tolerant Evaluation of Continuous Selection Queries over Sensor Data
Lazaridis, Iosif; Han, Qi; Mehrotra, Sharad; Venkatasubramanian, Nalini
Evaluation of Continuous Selection Queries over Sensor Dataevaluation of continuous selection queries (CSQs) over sensor-sensor suffices and there is no Fault Tolerant Evaluation of
Aksaray And Ecemis Faults - Diapiric Salt Relationships- Relevance...
Aksaray And Ecemis Faults - Diapiric Salt Relationships- Relevance To The Hydrocarbon Exploration In The Tuz Golu (Salt Lake) Basin, Central Anatolia, Turkey Jump to: navigation,...
Wrench faulting and cavity concentration ; Dollarhide Field, Andrews County, Texas
Dygert, Todd Charles
structure map for the Devonian horizon 20 7. Seismic time slice taken at 1010 ms 8. Seismic line 190 9. Seismic line 108 10. Seismic line 40 22 25 27 11. Cross-sectional view of a wrench fault 31 12. Pure shear fault model for strike- slip.... The Clearfork horizon was mapped first since it was shallow, strong and continuous. The faults and Devonian horizon were interpreted simultaneously, Adjacent lines were interpreted together throughout the survey to insure consistent fault and horizon picks...
Fault simulation of combinational circuits based on critical path tracing
Burnett, Charles James
advantage of the computer's internal architecture and does not intelligently analyze the CUT. The deductive simulator traverses the good circuit to determine the value of each line. At the same time, every fault that causes a line to have a different... of the faults on a line within the circuit is detected for a given test vector, the line is marked as critical [10]. These faults that are detected are marked as covered. This very quickly gathers faults without direct simulation to the outputs, however...
Effects of Volcanism, Crustal Thickness, and Large Scale Faulting...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
of Volcanism, Crustal Thickness, and Large Scale Faulting on the Development and Evolution of Geothermal Systems: Collaborative Project in Chile Effects of Volcanism, Crustal...
automatic fault management: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Software Fault Diagnosis by Exploiting Application Signatures Xiaoning Ding - The Ohio - The Ohio State University ABSTRACT Application problem diagnosis in complex...
automatic fault tree: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Software Fault Diagnosis by Exploiting Application Signatures Xiaoning Ding - The Ohio - The Ohio State University ABSTRACT Application problem diagnosis in complex...
automatical adaptive fault: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Software Fault Diagnosis by Exploiting Application Signatures Xiaoning Ding - The Ohio - The Ohio State University ABSTRACT Application problem diagnosis in complex...
Recent earthquake sequences at Coso: Evidence for conjugate faulting...
of faulting along conjugate planes. We present results from analyzing an earthquake sequence occurring in 1998 and compare it with a similar sequence that occurred in 1996. The...
Recurrent faulting and petroleum accumulation, Cat Creek Anticline, central Montana
Nelson, W.J. (Illinois State Geological Survey, Champaign (United States))
The Cat Creek anticline, scene of central Montana's first significant oil discovery, is underlain by a south-dipping high-angle fault (Cat Creek fault) that has undergone several episodes of movement with opposite sense of displacement. Borehole data suggest that the Cat Creek fault originated as a normal fault during Proterozoic rifting concurrent with deposition of the Belt Supergroup. Reverse faulting took place in Late Cambrian time, and again near the end of the Devonian Period. The Devonian episode, coeval with the Antler orogeny, raised the southern block several hundred feet. The southern block remained high through Meramecian time, then began to subside. Post-Atokan, pre-Middle Jurassic normal faulting lowered the southern block as much as 1,500 ft. During the Laramide orogeny (latest Cretaceous-Eocene) the Cat Creek fault underwent as much as 4,000 ft of reverse displacement and a comparable amount of left-lateral displacement. The Cat Creek anticline is a fault-propagation fold; en echelon domes and listric normal faults developed along its crest in response to wrenching. Oil was generated mainly in organic-rich shales of the Heath Formation (upper Chesterian Series) and migrated upward along tectonic fractures into Pennsylvanian, Jurassic, and Cretaceous reservoir rocks in structural traps in en echelon domes. Production has been achieved only from those domes where structural closure was retained from Jurassic through Holocene time.
Direct dating of Eocene reverse faulting in northeastern Tibet using Ar-dating of fault clays and low-temperature thermochronometry
Direct dating of Eocene reverse faulting in northeastern Tibet using Ar-dating of fault clays fault of northeastern Tibet by dating several size fractions of fault gouge clay that represent variable Ma and continued until at least Middle Miocene time and that authigenic clay growth occurred
Treanmission Line Fault Location using Interoperability and Integration of Data and ModelĀ
Dutta, Papiya
, classify and locate transmission line faults using synchronous samples of voltages and currents captured during fault transients from both ends of the transmission line of interest. The method is tested for several faults simulated on IEEE 118 bus test...
Fault tolerant control of homopolar magnetic bearings and circular sensor arraysĀ
Li, Ming-Hsiu
Fault tolerant control can accommodate the component faults in a control system such as sensors, actuators, plants, etc. This dissertation presents two fault tolerant control schemes to accommodate the failures of power ...
A Comparison of Fault Detection Methods For a Transcritical Refrigeration System
Janecke, Alex Karl
pairings of four faults: over/undercharge, evaporator fouling, gas cooler fouling, and compressor valve leakage. This technique allows for low cost measurement and independent detection of individual faults even when multiple faults are present. Results...
Early Holocene and Late Pleistocene slip rates of the southern Dead Sea Fault determined from 10
Klinger, Yann
sites located along the Wadi Araba Fault (WAF) segment of the Dead Sea Fault are targeted on the DSF, focusing on the Wadi Araba Fault (WAF) segment (Figure 1b). The WAF strikes N12░E for about 160
Data-Based Monitoring and Fault-Tolerant Control of Nonlinear Processes
Chilin, David
with a fault in the heat input/removal actuator to vessel 2with a fault in the heat input/removal actuator to vessel 2with a fault in the heat input/removal actuator to vessel 2
Nuclear power plant fault-diagnosis using artificial neural networks
Kim, Keehoon; Aljundi, T.L.; Bartlett, E.B.
Artificial neural networks (ANNs) have been applied to various fields due to their fault and noise tolerance and generalization characteristics. As an application to nuclear engineering, we apply neural networks to the early recognition of nuclear power plant operational transients. If a transient or accident occurs, the network will advise the plant operators in a timely manner. More importantly, we investigate the ability of the network to provide a measure of the confidence level in its diagnosis. In this research an ANN is trained to diagnose the status of the San Onofre Nuclear Generation Station using data obtained from the plant`s training simulator. Stacked generalization is then applied to predict the error in the ANN diagnosis. The data used consisted of 10 scenarios that include typical design basis accidents as well as less severe transients. The results show that the trained network is capable of diagnosing all 10 instabilities as well as providing a measure of the level of confidence in its diagnoses.
Research on Fault Analysis and Fault-Tolerant Control of EV/HEV Powertrain
Brest, Universitķ de
power industries, interests in diagnostics and fault-tolerant control of nuclear power plants have been industrial systems. To achieve these goals, monitoring and supervision are embedded in the electrical energy, FTC has been implemented in sensible applications such as aerospace, nuclear power, automotive
Efficient Fault Tolerance: an Approach to Deal with Transient Faults in Multiprocessor Architectures
Firenze, Universit├Ā degli Studi di
, 36, 56126 Pisa, Italy ** IEI/CNR, Via S. Maria, 46, 56126 Pisa, Italy Abstract Dynamic error, while making efficient use of the available resources. To this end, dynamic error processing must is integrated with a mechanism for dynamic error processing in a complete fault tolerance strategy. Reliability
Lightweight storage and overlay networks for fault tolerance.
Oldfield, Ron A.
The next generation of capability-class, massively parallel processing (MPP) systems is expected to have hundreds of thousands to millions of processors, In such environments, it is critical to have fault-tolerance mechanisms, including checkpoint/restart, that scale with the size of applications and the percentage of the system on which the applications execute. For application-driven, periodic checkpoint operations, the state-of-the-art does not provide a scalable solution. For example, on today's massive-scale systems that execute applications which consume most of the memory of the employed compute nodes, checkpoint operations generate I/O that consumes nearly 80% of the total I/O usage. Motivated by this observation, this project aims to improve I/O performance for application-directed checkpoints through the use of lightweight storage architectures and overlay networks. Lightweight storage provide direct access to underlying storage devices. Overlay networks provide caching and processing capabilities in the compute-node fabric. The combination has potential to signifcantly reduce I/O overhead for large-scale applications. This report describes our combined efforts to model and understand overheads for application-directed checkpoints, as well as implementation and performance analysis of a checkpoint service that uses available compute nodes as a network cache for checkpoint operations.
Understanding Human Experience Henry Kautz
Kautz, Henry
Understanding Human Experience Henry Kautz One of the earliest goals of research in artificial intelligence was to create systems that can interpret and understand day to day human experience. Early work on the goal of building systems that understand human experience. Each of the previous barriers is weakened
A core-based assessment of the spatial relationship of small faults associated with a basement-controlled, large normal fault in the Hickory Sandstone
Graff, Mitchell C
Measures of Small Faults??????????????? Page iii v vi viii xiv 1 3 3 5 7 10 10 10 12 14 18 20 26 28 vii 4. ESTIMATING SMALL FAULT DISPLACEMENT USING FAULT GOUGE THICKNESS AND PROTOLITH TEXTURE??????????... 4.1 Previous Work... is proportional to mean?????????????????????. 26 Combined scatterplot of faults with known gouge thickness versus known displacement and faults with known gouge thickness versus estimated displacement????????????????????. Page 37 38 39 40 43 45 47 48...
SciTech Connect: Development of Asset Fault Signatures for Prognostic...
Office of Scientific and Technical Information (OSTI)
Development of Asset Fault Signatures for Prognostic and Health Management in the Nuclear Industry Citation Details In-Document Search Title: Development of Asset Fault Signatures...
Automatic Fault Characterization via Abnormality-Enhanced Classification
Bronevetsky, G; Laguna, I; de Supinski, B R
Enterprise and high-performance computing systems are growing extremely large and complex, employing hundreds to hundreds of thousands of processors and software/hardware stacks built by many people across many organizations. As the growing scale of these machines increases the frequency of faults, system complexity makes these faults difficult to detect and to diagnose. Current system management techniques, which focus primarily on efficient data access and query mechanisms, require system administrators to examine the behavior of various system services manually. Growing system complexity is making this manual process unmanageable: administrators require more effective management tools that can detect faults and help to identify their root causes. System administrators need timely notification when a fault is manifested that includes the type of fault, the time period in which it occurred and the processor on which it originated. Statistical modeling approaches can accurately characterize system behavior. However, the complex effects of system faults make these tools difficult to apply effectively. This paper investigates the application of classification and clustering algorithms to fault detection and characterization. We show experimentally that naively applying these methods achieves poor accuracy. Further, we design novel techniques that combine classification algorithms with information on the abnormality of application behavior to improve detection and characterization accuracy. Our experiments demonstrate that these techniques can detect and characterize faults with 65% accuracy, compared to just 5% accuracy for naive approaches.
The northwest extension of the Meers Fault in southwestern Oklahoma
Cetin, Hasan
+ t '+ + + ~et t 30 mt ~ 39 ~ 40 mt ~ 49 a 50 mt 59 060 m& 69 O20 mts29 26 26 ASZ ? ANNA SEISMIC ZONE ES ? ENOLA SWARM KRF ? KENTUCKY RIVER FAULT MF ? MEERS FAULT MU ? MONROE UPLIFT NM ? NEW MADRID NU ? NEMAHA UPLIFT PSD ? PIERRE, SOUTH DAKOTA WVF...
An Information Flow Model of Fault Detection Margaret C. Thompson ?
Massachusetts at Amherst, University of
not be practical. NonetheŁ less, Relay provides insight into testing and fault deŁ tection and suggests an approach and Computer Science Amherst, MA 01003 University of California Irvine, CA 92717 Abstract Relay is a model of how a fault causes a failure on execution of some test datum. This process begins with introduction
Fault Tolerant Oxygen Control of a Diesel Engine Air System
Paris-Sud XI, Universitķ de
Fault Tolerant Oxygen Control of a Diesel Engine Air System Rainer Nitsche Matthias Bitzer control problem of a Diesel engine air system having a jammed Exhaust Gas Recirculation (EGR) valve of the air system. Keywords: Fault tolerant control, Diesel engine, Air system, Model-based trajectory
All-to-all sequenced fault detection system
Archer, Charles Jens (Rochester, MN); Pinnow, Kurt Walter (Rochester, MN); Ratterman, Joseph D. (Rochester, MN); Smith, Brian Edward (Rochester, MN)
An apparatus, program product and method enable nodal fault detection by sequencing communications between all system nodes. A master node may coordinate communications between two slave nodes before sequencing to and initiating communications between a new pair of slave nodes. The communications may be analyzed to determine the nodal fault.
Fault Detection, Identification and Accommodation for an Electro-hydraulic
Yao, Bin
Fault Detection, Identification and Accommodation for an Electro-hydraulic System: An Adaptive in electro-hydraulic systems. It is well known fact that any realistic model of a hydraulic system suffers, such a scheme becomes a natural choice for designing robust fault detection algorithms for electro-hydraulic
Arcing fault in sub-distribution branch circuits
Parise, G.; Grasseli, U.; Luozzo, V. Di (Univ. di Roma, Rome (Italy). Dept. di Ingegneria Elettrica)
It's well known the importance of short-circuit current evaluation for the design of any power system. Every system is subject to faults, moreover short-circuits and ground faults can be expected in any point. Even if the maximum and minimum values are generally defined with reference at a bolted-fault, bolted short-circuits are rare and the fault usually involves arcing and burning; particularly the limit value of minimum short-circuit depends really on arcing-fault. In earlier experimental investigations into the functional simulation of insulation loss, in branch circuit conductors, the authors chose to normalize the arcing-fault simulation to be used in laboratory tests. This conventional simulation allows characterization of this intrinsically random phenomenon by means of a probabilistic approach, in order to define in statistical terms the expected short circuit value. The authors examine more closely the arcing-fault in the design of sub distribution branch-circuits as weak points of the installation. In fact, what they propose are straightforward criteria, whether in the structure of the system or in the coordination of protection, which afford a more rational control on arcing-fault.
Stator current demodulation for induction machine rotor faults diagnosis
Boyer, Edmond
with emphasis on stator current processing [1], [2]. It has been proven that mechanical and electrical faultsStator current demodulation for induction machine rotor faults diagnosis El Houssin El Bouchikhi of the stator currents. Hence, demodulation of the stator currents is of high interest for induction machines
Fuzzy Pattern Recognition Based Fault Diagnosis Rafik Bensaadi1
Boyer, Edmond
Fuzzy Pattern Recognition Based Fault Diagnosis Rafik Bensaadi1 , Leïla H. Mouss1 , Mohamed D in this paper the design of a Fuzzy Pattern Recognition System (FPRS) that solves, in real time, the main. Keywords: Diagnosis, fault detection, pattern recognition, fuzzy control, conjugate gradients, complex
Symbolic identification for fault detection in aircraft gas turbine engines
Ray, Asok
Symbolic identification for fault detection in aircraft gas turbine engines S Chakraborty, S Sarkar and computationally inexpensive technique of component-level fault detection in aircraft gas-turbine engines identification, gas turbine engines, language-theoretic analysis 1 INTRODUCTION The propulsion system of modern
Online Fault Detection and Tolerance for Photovoltaic Energy Harvesting Systems
Pedram, Massoud
and weather conditions (e.g., clouds), and the output power of PV systems is directly dependent on solar and mitigate the output power shortage under low levels of solar irradiance. Moreover, PV panels exhibit highly fault detection and tolerance. Our fault detection and tolerance technique reduces output power
Triassic/Jurassic faulting patterns of Conecuh Ridge, southwest Alabama
Hutley, J.K.
Two major fault systems influenced Jurassic structure and deposition on the Conecuh Ridge, southwest Alabama. Identification and dating of these fault systems are based on seismic-stratigraphic interpretation of a 7-township grid in Monroe and Conecuh Counties. Relative time of faulting is determined by fault geometry and by formation isopachs and isochrons. Smackover and Norphlet Formations, both Late Jurassic in age, are mappable seismic reflectors and are thus reliable for seismicstratigraphic dating. The earlier of the 2 fault systems is a series of horsts and grabens that trends northeast-southwest and is Late Triassic to Early Jurassic in age. The system formed in response to tensional stress associated with the opening of the Atlantic Ocean. The resulting topography was a series of northeast-southwest-trending ridges. Upper Triassic Eagle Mills and Jurassic Werner Formations were deposited in the grabens. The later fault system is also a series of horsts and grabens trending perpendicular to the first. This system was caused by tensional stress related to a pulse in the opening of the Gulf of Mexico. Faulting began in Early Jurassic and continued into Late Jurassic, becoming progressively younger basinward. At the basin margin, faulting produced a very irregular shoreline. Submerged horst blocks became centers for shoaling or carbonate buildups. Today, these blocks are exploration targets in southwest Alabama.
Using Reinforcement Learning for Proactive Network Fault Management
Shayman, Mark A.
fault management demands intelligent man┬Ł agement actions be taken by central manager or remote agents.g., alarms) which appear sequentially. For example, on the manager's side, polling devices randomly (orUsing Reinforcement Learning for Proactive Network Fault Management Qiming He, Mark A. Shayman
Development of Hydrologic Characterization Technology of Fault Zones
Karasaki, Kenzi; Onishi, Tiemi; Wu, Yu-Shu
Through an extensive literature survey we find that there is very limited amount of work on fault zone hydrology, particularly in the field using borehole testing. The common elements of a fault include a core, and damage zones. The core usually acts as a barrier to the flow across it, whereas the damage zone controls the flow either parallel to the strike or dip of a fault. In most of cases the damage zone isthe one that is controlling the flow in the fault zone and the surroundings. The permeability of damage zone is in the range of two to three orders of magnitude higher than the protolith. The fault core can have permeability up to seven orders of magnitude lower than the damage zone. The fault types (normal, reverse, and strike-slip) by themselves do not appear to be a clear classifier of the hydrology of fault zones. However, there still remains a possibility that other additional geologic attributes and scaling relationships can be used to predict or bracket the range of hydrologic behavior of fault zones. AMT (Audio frequency Magneto Telluric) and seismic reflection techniques are often used to locate faults. Geochemical signatures and temperature distributions are often used to identify flow domains and/or directions. ALSM (Airborne Laser Swath Mapping) or LIDAR (Light Detection and Ranging) method may prove to be a powerful tool for identifying lineaments in place of the traditional photogrammetry. Nonetheless not much work has been done to characterize the hydrologic properties of faults by directly testing them using pump tests. There are some uncertainties involved in analyzing pressure transients of pump tests: both low permeability and high permeability faults exhibit similar pressure responses. A physically based conceptual and numerical model is presented for simulating fluid and heat flow and solute transport through fractured fault zones using a multiple-continuum medium approach. Data from the Horonobe URL site are analyzed to demonstrate the proposed approach and to examine the flow direction and magnitude on both sides of a suspected fault. We describe a strategy for effective characterization of fault zone hydrology. We recommend conducting a long term pump test followed by a long term buildup test. We do not recommend isolating the borehole into too many intervals. We do recommend ensuring durability and redundancy for long term monitoring.
Understanding Regional Economic Growth in IndiaUnderstanding Regional Economic Growth in India Understanding Regional Economic
Understanding Regional Economic Growth in IndiaUnderstanding Regional Economic Growth in India Understanding Regional Economic Growth in India* Jeffrey D. Sachs Director The Earth Institute at firstname.lastname@example.com Asian Economic Papers 1:3 ┬® 2002 The Earth Institute at Columbia University and the Massachusetts
Test generation and fault detection for VLSI PPL circuits
Amin, A.A.M.
The problem of design for testability of PPL logic circuits is addressed. A test-generation package was developed which utilizes the special features of PPL logic to generate high fault coverage test vectors at a reduced computational cost. The test strategy assumes that one of the scan design techniques is used. A new methodology for test-vectors compaction without compromising the fault coverage is also proposed. A fault-oriented test-generation algorithm combined with a heuristic test-generation algorithm are the essential ingredients of this package. The fault-oriented algorithm uses a modified D-algorithm which includes look-ahead features and a new seven-valued logic to improve the average speed of the test-generation process. Fault coverages in the 90% range were obtained using the test sequences generated by this package.
Boullier The fault zone geology 1 Fault zone geology: lessons from drilling through the Nojima and 1
Paris-Sud XI, Universit├® de
drilling through the Nojima and 1 Chelungpu faults 2 3 Anne-Marie Boullier email@example.com 8 9 Abstract 10 Several drilling projects have been conducted through significant topics 32 for future research, one of which was "fault zone drilling
Boullier The fault zone geology 1 Fault zone geology: lessons from drilling through the Nojima and 1
Boyer, Edmond
drilling through the Nojima and 1 Chelungpu faults 2 3 Anne-Marie Boullier email@example.com 8 9 Abstract 10 Several drilling projects have been conducted through was "fault zone drilling combined with surface-based 33 geophysical and geological
Rupture Dynamics of Strike-Slip Faults with Stepovers: From Conceptually Simplified to Realistically Complex Fault Systems
Liu, Zaifeng
, the Aksay double-bend in the Altyn Tagh fault, and its ability to stop the dynamic rupture. A detailed parameter-space study has been performed in the simplified model. From the single fault test, I find that the Positive Coulomb Stress (PCS) region...
Feb. 11, 2008 Advanced Fault Tolerance Solutions for High Performance Computing 1/47 Advanced Fault Tolerance Solutions
Engelmann, Christian
Feb. 11, 2008 Advanced Fault Tolerance Solutions for High Performance Computing 1/47 RAS RAS Advanced Fault Tolerance Solutions for High Performance Computing Christian Engelmann Oak Ridge National Solutions for High Performance Computing 2/47 Ę Nation's largest energy laboratory Ę Nation's largest
Final Technical Report Recovery Act: Online Nonintrusive Condition Monitoring and Fault Detection for Wind Turbines
Wei Qiao
The penetration of wind power has increased greatly over the last decade in the United States and across the world. The U.S. wind power industry installed 1,118 MW of new capacity in the first quarter of 2011 alone and entered the second quarter with another 5,600 MW under construction. By 2030, wind energy is expected to provide 20% of the U.S. electricity needs. As the number of wind turbines continues to grow, the need for effective condition monitoring and fault detection (CMFD) systems becomes increasingly important [3]. Online CMFD is an effective means of not only improving the reliability, capacity factor, and lifetime, but it also reduces the downtime, energy loss, and operation and maintenance (O&M) of wind turbines. The goal of this project is to develop novel online nonintrusive CMFD technologies for wind turbines. The proposed technologies use only the current measurements that have been used by the control and protection system of a wind turbine generator (WTG); no additional sensors or data acquisition devices are needed. Current signals are reliable and easily accessible from the ground without intruding on the wind turbine generators (WTGs) that are situated on high towers and installed in remote areas. Therefore, current-based CMFD techniques have great economic benefits and the potential to be adopted by the wind energy industry. Specifically, the following objectives and results have been achieved in this project: (1) Analyzed the effects of faults in a WTG on the generator currents of the WTG operating at variable rotating speed conditions from the perspective of amplitude and frequency modulations of the current measurements; (2) Developed effective amplitude and frequency demodulation methods for appropriate signal conditioning of the current measurements to improve the accuracy and reliability of wind turbine CMFD; (3) Developed a 1P-invariant power spectrum density (PSD) method for effective signature extraction of wind turbine faults with characteristic frequencies in the current or current demodulated signals, where 1P stands for the shaft rotating frequency of a WTG; (4) Developed a wavelet filter for effective signature extraction of wind turbine faults without characteristic frequencies in the current or current demodulated signals; (5) Developed an effective adaptive noise cancellation method as an alternative to the wavelet filter method for signature extraction of wind turbine faults without characteristic frequencies in the current or current demodulated signals; (6) Developed a statistical analysis-based impulse detection method for effective fault signature extraction and evaluation of WTGs based on the 1P-invariant PSD of the current or current demodulated signals; (7) Validated the proposed current-based wind turbine CMFD technologies through extensive computer simulations and experiments for small direct-drive WTGs without gearboxes; and (8) Showed, through extensive experiments for small direct-drive WTGs, that the performance of the proposed current-based wind turbine CMFD technologies is comparable to traditional vibration-based methods. The proposed technologies have been successfully applied for detection of major failures in blades, shafts, bearings, and generators of small direct-drive WTGs. The proposed technologies can be easily integrated into existing wind turbine control, protection, and monitoring systems and can be implemented remotely from the wind turbines being monitored. The proposed technologies provide an alternative to vibration-sensor-based CMFD. This will reduce the cost and hardware complexity of wind turbine CMFD systems. The proposed technologies can also be combined with vibration-sensor-based methods to improve the accuracy and reliability of wind turbine CMFD systems. When there are problems with sensors, the proposed technologies will ensure proper CMFD for the wind turbines, including their sensing systems. In conclusion, the proposed technologies offer an effective means to achieve condition-based smart maintenance for wind turbines and have a gre
Doppler characteristics of sea clutter.
Raynal, Ann Marie; Doerry, Armin Walter
Doppler radars can distinguish targets from clutter if the target's velocity along the radar line of sight is beyond that of the clutter. Some targets of interest may have a Doppler shift similar to that of clutter. The nature of sea clutter is different in the clutter and exo-clutter regions. This behavior requires special consideration regarding where a radar can expect to find sea-clutter returns in Doppler space and what detection algorithms are most appropriate to help mitigate false alarms and increase probability of detection of a target. This paper studies the existing state-of-the-art in the understanding of Doppler characteristics of sea clutter and scattering from the ocean to better understand the design and performance choices of a radar in differentiating targets from clutter under prevailing sea conditions.
Development of Characterization Technology for Fault Zone Hydrology
Karasaki, Kenzi; Onishi, Tiemi; Gasperikova, Erika; Goto, Junichi; Tsuchi, Hiroyuki; Miwa, Tadashi; Ueta, Keiichi; Kiho, Kenzo; MIyakawa, Kimio
Several deep trenches were cut, and a number of geophysical surveys were conducted across the Wildcat Fault in the hills east of Berkeley, California. The Wildcat Fault is believed to be a strike-slip fault and a member of the Hayward Fault System, with over 10 km of displacement. So far, three boreholes of ~;; 150m deep have been core-drilled and borehole geophysical logs were conducted. The rocks are extensively sheared and fractured; gouges were observed at several depths and a thick cataclasitic zone was also observed. While confirming some earlier, published conclusions from shallow observations about Wildcat, some unexpected findings were encountered. Preliminary analysis indicates that Wildcat near the field site consists of multiple faults. The hydraulic test data suggest the dual properties of the hydrologic structure of the fault zone. A fourth borehole is planned to penetrate the main fault believed to lie in-between the holes. The main philosophy behind our approach for the hydrologic characterization of such a complex fractured system is to let the system take its own average and monitor a long term behavior instead of collecting a multitude of data at small length and time scales, or at a discrete fracture scale and to ?up-scale,? which is extremely tenuous.
Opportunistic Transient-Fault Detection Mohamed A. Gomaa and T. N. Vijaykumar
Vijaykumar, T. N.
Opportunistic Transient-Fault Detection Mohamed A. Gomaa and T. N. Vijaykumar School of Electrical susceptibility of microprocessors to transient faults. Most current proposals for transient-fault detection use redundancy by exploiting reuse's implicit redundancy within the main thread for fault detection with vir
Locating hardware faults in a parallel computer
Archer, Charles J.; Megerian, Mark G.; Ratterman, Joseph D.; Smith, Brian E.
Locating hardware faults in a parallel computer, including defining within a tree network of the parallel computer two or more sets of non-overlapping test levels of compute nodes of the network that together include all the data communications links of the network, each non-overlapping test level comprising two or more adjacent tiers of the tree; defining test cells within each non-overlapping test level, each test cell comprising a subtree of the tree including a subtree root compute node and all descendant compute nodes of the subtree root compute node within a non-overlapping test level; performing, separately on each set of non-overlapping test levels, an uplink test on all test cells in a set of non-overlapping test levels; and performing, separately from the uplink tests and separately on each set of non-overlapping test levels, a downlink test on all test cells in a set of non-overlapping test levels.
Steps toward fault-tolerant quantum chemistry.
Taube, Andrew Garvin
Developing quantum chemistry programs on the coming generation of exascale computers will be a difficult task. The programs will need to be fault-tolerant and minimize the use of global operations. This work explores the use a task-based model that uses a data-centric approach to allocate work to different processes as it applies to quantum chemistry. After introducing the key problems that appear when trying to parallelize a complicated quantum chemistry method such as coupled-cluster theory, we discuss the implications of that model as it pertains to the computational kernel of a coupled-cluster program - matrix multiplication. Also, we discuss the extensions that would required to build a full coupled-cluster program using the task-based model. Current programming models for high-performance computing are fault-intolerant and use global operations. Those properties are unsustainable as computers scale to millions of CPUs; instead one must recognize that these systems will be hierarchical in structure, prone to constant faults, and global operations will be infeasible. The FAST-OS HARE project is introducing a scale-free computing model to address these issues. This model is hierarchical and fault-tolerant by design, allows for the clean overlap of computation and communication, reducing the network load, does not require checkpointing, and avoids the complexity of many HPC runtimes. Development of an algorithm within this model requires a change in focus from imperative programming to a data-centric approach. Quantum chemistry (QC) algorithms, in particular electronic structure methods, are an ideal test bed for this computing model. These methods describe the distribution of electrons in a molecule, which determine the properties of the molecule. The computational cost of these methods is high, scaling quartically or higher in the size of the molecule, which is why QC applications are major users of HPC resources. The complexity of these algorithms means that MPI alone is insufficient to achieve parallel scaling; QC developers have been forced to use alternative approaches to achieve scalability and would be receptive to radical shifts in the programming paradigm. Initial work in adapting the simplest QC method, Hartree-Fock, to this the new programming model indicates that the approach is beneficial for QC applications. However, the advantages to being able to scale to exascale computers are greatest for the computationally most expensive algorithms; within QC these are the high-accuracy coupled-cluster (CC) methods. Parallel coupledcluster programs are available, however they are based on the conventional MPI paradigm. Much of the effort is spent handling the complicated data dependencies between the various processors, especially as the size of the problem becomes large. The current paradigm will not survive the move to exascale computers. Here we discuss the initial steps toward designing and implementing a CC method within this model. First, we introduce the general concepts behind a CC method, focusing on the aspects that make these methods difficult to parallelize with conventional techniques. Then we outline what is the computational core of the CC method - a matrix multiply - within the task-based approach that the FAST-OS project is designed to take advantage of. Finally we outline the general setup to implement the simplest CC method in this model, linearized CC doubles (LinCC).
Self field triggered superconducting fault current limiter
Tekletsadik, Kasegn D. (Rexford, NY)
A superconducting fault current limiter array with a plurality of superconductor elements arranged in a meanding array having an even number of supconductors parallel to each other and arranged in a plane that is parallel to an odd number of the plurality of superconductors, where the odd number of supconductors are parallel to each other and arranged in a plane that is parallel to the even number of the plurality of superconductors, when viewed from a top view. The even number of superconductors are coupled at the upper end to the upper end of the odd number of superconductors. A plurality of lower shunt coils each coupled to the lower end of each of the even number of superconductors and a plurality of upper shunt coils each coupled to the upper end of each of the odd number of superconductors so as to generate a generally orthoganal uniform magnetic field during quenching using only the magenetic field generated by the superconductors.
Towards an Improved Understanding of Statistical Extrapolation for Wind
Manuel, Lance
29 April 2008; Revised 27 September 2008; Accepted 30 September 2008 WIND ENERGY Wind Energ. 2008; 11Towards an Improved Understanding of Statistical Extrapolation for Wind Turbine Extreme Loads the International Electrotechnical Com- mission standard for wind turbine design requires that characteristic loads
Understanding Japan's Role in a
Qian, Ning
Understanding Japan's Role in a Global Economy #12;Promoting Knowledge on Japan The Center Japan focused on understanding Japan's role in the global economy. Established in 1986 under... Ę Organizing conferences, workshops and seminars on topics related to Japan and the United States, and the role
Fault-tree construction and calculations on a microcomputer
Beckmann, Jeffery Linn
Figure 17 - Program Overview Screen Figure 18 ? Main Menu Screen Figure 19 ? Invalid Command Screen Figure 20 - First Usage of Disk Screen Figure 21 ? Fault-tree Name Screen Figure 22 - Invalid Fault-tree Name Screen Fi gure 23 ? TOP EVENT Label... to do? Fi gure 19. Inval i d Command Screen 53 CREATE - This command allows the user to build a new fault tree. After a CREATE command is entered, the system wi 1 1 display the screen in Figure 20. This question is asked in order to determine...
Visualization of stacking faults in fcc crystals in plastic deformations
Takeshi Kawasaki; Akira Onuki
Using molecular dynamics simulation, we investigate the dynamics of stacking faults in fcc crystals in uniaxial stretching in a Lennard-Jones binary mixture composed of 4096 particles in three dimensions. We visualize stacking faults using a disorder variable $D_j(t)$ for each particle $j$ constructed from local bond order parameters based on spherical harmonics (Steinhardt order parameters). Also introducing a method of bond breakage, we examine how stacking faults are formed and removed by collective particle motions. These processes are relevant in plasticity of fcc crystals.
Fault-tree construction and calculations on a microcomputerĀ
Beckmann, Jeffery Linn
Figure 17 - Program Overview Screen Figure 18 ? Main Menu Screen Figure 19 ? Invalid Command Screen Figure 20 - First Usage of Disk Screen Figure 21 ? Fault-tree Name Screen Figure 22 - Invalid Fault-tree Name Screen Fi gure 23 ? TOP EVENT Label... to do? Fi gure 19. Inval i d Command Screen 53 CREATE - This command allows the user to build a new fault tree. After a CREATE command is entered, the system wi 1 1 display the screen in Figure 20. This question is asked in order to determine...
Dynamic leakage of faults during differential depletion: Theory, models, and examples from the Niger delta
Watts, N.L.; Kaars Sijpestein, C.H.; Osai, L.N.; Okoli, O.C. (Shell Petroleum Development Co. of Nigeria, Lagos (Nigeria))
Previous studies of fault sealing have addressed possible fault leakage during secondary migration due to the effects of increased hydrocarbon-water capillary pressure, fracturing, or small-scale incremental fault movements. Of equal importance to production geologists is the failure and leakage of faults during field development due to differential depletion of adjacent fault blocks. This paper examines the unique problems associated with this dynamic leakage of faults. It is theoretically shown that the fault sealing mechanism, and the extent of the seal, directly influences the failure process which in turn results in a variety of favorable and unfavorable effects on field development. The qualitative models give considerable insight into such aspects as oil-column expansion and resaturation losses, interfault block aquifer support (with important implications to material balance calculations), possible leakage or spillage of oil across faults, and potential fault failure during (re)injection projects. Examples of dynamic fault leakage are presented from selected fields of the Niger delta.
Automated transmission line fault analysis using synchronized sampling at two ends
Kezunovic, M. [Texas A and M Univ., College Station, TX (United States)] [Texas A and M Univ., College Station, TX (United States); Perunicic, B. [Lamar Univ., Beaumont, TX (United States)] [Lamar Univ., Beaumont, TX (United States)
This paper introduces a new approach to fault analysis using synchronized sampling. A digital fault recorder with Global Positioning System (GPS) satellite receiver is the source of data for this approach. Fault analysis functions, such as fault detection, classification and location are implemented for a transmission line using synchronized samples from two ends of a line. This technique can be extremely fast, selective and accurate, providing fault analysis performance that can not easily be matched by other known techniques.
Automated transmission line fault analysis using synchronized sampling at two ends
Kezunovic, M. [Texas A and M Univ., College Station, TX (United States); Perunicic, B. [Lamar Univ., Beaumont, TX (United States)
This paper introduces a new approach to fault analysis using synchronized sampling. A digital fault recorder with Global Positioning System (GPS) satellite receiver is the source of data for this approach. Fault analysis functions, such as fault detection, classification and location are implemented for a transmission line using synchronized samples from two ends of a line. This technique can be extremely fast, selective and accurate, providing fault analysis performance that can not easily be matched by other known techniques.
C-testability of a ripple carry adder under multiple faults
Bommena, Manoher V.
. Fault Types IV FAULT SIMULATION AND EXPERIMENT . A. Physical Line Fault Simulation . 1. Layout 2. Simulation B. Functional Fault Simulation and Experiment . 1. Probability of Un-detection 2. Efficiency of the Test Vectors and Reduced Test V... RESULTS VI CONCLUSIONS AND RECOMMENDATIONS 9 10 12 18 18 19 22 27 27 Set . 30 REFERENCES 41 APPENDIX A APPENDIX B . Page APPENDIX C . I. IST OF TABLES TABLE Page I Expressions from the physical line fault simulation stage 24 II...
Characteristics of a Marine Stratocumulus to Cumulus Cloud Transition
Zapalac, Allison
The studies in this thesis aim to improve the overall understanding of the characteristics of the marine stratocumulus to shallow cumulus transition over the southeast Pacific Ocean. This study uses observations from CloudSat and CALIPSO satellite...
The paths and characteristics of real estate entrepreneurs
Kazmierski, Michael (Michael Anthony)
What paths have real estate entrepreneurs taken to establish their own firm? Also, what characteristics did they develop and utilize in the process? This thesis gives the unique opportunity to better understand the life ...
Capillary characteristics in microfluidic experiments and computational simulation
Das, Anusuya
Angiogenesis is crucial during many physiological processes, and is influenced by various biochemical and biomechanical factors. Models have proven useful in understanding the mechanisms of angiogenesis and the characteristics ...
On the characteristics of fault-induced rotor-dynamic bifurcations and nonlinear responses
Yang, Baozhong
and Poincare map of the response in (a) .........41 3.4 (a) Time history of a nonlinear time-delay model. (b) Corresponding phase portrait and Poincare map of the response in (a) .........42 3.5 Phase portrait and Poincare map of a fractal... reaction forces, which in turn could result in strong nonlinear responses including period-doubling bifurcation, quasi-periodic bifurcation, and even chaotic response [4,5]. Nonlinear dynamical states of quasi-periodic, fractal, and chaotic motions...
that incorporates geologic well data, three dimensional seismic data, geomechanical analysis, and well production been calculated based on available well data. Incorporation of geomechanical stresses allows the known geomechanical properties of the reservoir interval. Ultimately, this model highlights
Source characteristics of large deep earthquakes: Constraint on the faulting mechanism at great depths
Tibi, Rigobert
indicate significant energy dissipation due to heating and possible melt production. The 1991 Argentina the other known South American large deep events such as 1963 Peru, 1970 Colombia and 1994 Bolivia
anatolian fault zone: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
across the Mudurnu segment of the North Anatolian Fault Zone (NAFZ) in northwestern Turkey Ben-Zion, Yehuda 2 Velocity contrast across the 1944 rupture zone of the North...
An information model for inter-organizational fault Patricia Marcu
in the IT Infrastructure Library (ITIL) [2] and related frameworks in the area of IT service management (ITSM). But since ITIL and the related ITSM frameworks do not consider specific aspects of inter- organizational (fault
Melt generation, crystallization, and extraction beneath segmented oceanic transform faults
Gregg, Patricia M.
We examine mantle melting, fractional crystallization, and melt extraction beneath fast slipping, segmented oceanic transform fault systems. Three-dimensional mantle flow and thermal structures are calculated using a ...
Non-intrusive fault detection in reciprocating compressors
Schantz, Christopher James
This thesis presents a set of techniques for non-intrusive sensing and fault detection in reciprocating compressors driven by induction motors. The procedures developed here are "non-intrusive" because they rely only on ...
andreas fault system: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
system Sontag, Eduardo 23 The San Andreas Fault In The San Francisco Bay Area, California: A Geology Fieldtrip Guidebook To Selected Stops On Public Lands CiteSeer Summary:...
Detecting and tolerating Byzantine faults in database systems
Vandiver, Benjamin Mead, 1978-
This thesis describes the design, implementation, and evaluation of a replication scheme to handle Byzantine faults in transaction processing database systems. The scheme compares answers from queries and updates on multiple ...
Detecting and Tolerating Byzantine Faults in Database Systems
Vandiver, Benjamin Mead
This thesis describes the design, implementation, and evaluation of a replication scheme to handle Byzantine faults in transaction processing database systems. The scheme compares answers from queries and updates on multiple ...
Cryptic Faulting and Multi-Scale Geothermal Fluid Connections...
from Mt Resistivity Surveying Jump to: navigation, search OpenEI Reference LibraryAdd to library Conference Paper: Cryptic Faulting and Multi-Scale Geothermal Fluid Connections in...
Intersecting Fault Trends and Crustal-Scale Fluid Pathways Below...
3d Magnetotelluric Surveying Jump to: navigation, search OpenEI Reference LibraryAdd to library Conference Paper: Intersecting Fault Trends and Crustal-Scale Fluid Pathways Below...
THE EAST FLANK AND COSO WASH Jump to: navigation, search OpenEI Reference LibraryAdd to library Conference Proceedings: STRESS AND FAULTING IN THE COSO GEOTHERMAL FIELD: UPDATE...
arcing fault fires: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
stacking faults at a production-rate of few gmin. A guideline for controlling the number of layers of such FLG has also been suggested. Karmakar, Soumen; Lalla, Niranjan P;...
assembly line fault: Topics by E-print Network
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of fault data to verify that all elements of the protection system Siegel, Mel 190 Bucket brigades on in-tree assembly networks John J. Bartholdi III a,*, Donald D. Eisenstein...
Microgrid Fault Protection Based on Symmetrical and Differential Current Components
Microgrid Fault Protection Based on Symmetrical and Differential Current Components Prepared.........................................................................................8 2. AEP CERTS MICROGRID .........................................................................9 ........................................................................67 #12;3 Index of Figures Figure 1: Schematic representation of the AEP CERTS microgrid
Fault Tolerant WideArea Parallel Computing Jon B. Weissman
Weissman, Jon
hosts go down and get rebooted, and network faults where links go down. A single monolithic soluŁ tion not fit their assumptions, the maxim ``pay for what you need'' has been proposed as a guiding principle
Faults as potential hydrocarbon barriers, Arroyo Grande, California
Switek, Daniel Paul
Faulting in a sandstone introduces properties which are different from the country rock. Previous work has shown that these new properties can significantly impede the flow of hydrocarbons through the country rock. This thesis seeks to analyze...
Robust model-based fault diagnosis for chemical process systems
Rajaraman, Srinivasan
Fault detection and diagnosis have gained central importance in the chemical process industries over the past decade. This is due to several reasons, one of them being that copious amount of data is available from a large number of sensors...
Analysis of transmission system faults in the phase domain
Zhu, Jun
In order to maintain a continuous power suppply, nowadays relays in transmission systems are required to be able to deal with complicated faults involving non-conventional connections, which poses a challenge to the short circuit analysis...
Controls on Fault-Hosted Fluid Flow: Preliminary Results from...
Geothermal Field, CA Jump to: navigation, search OpenEI Reference LibraryAdd to library Conference Proceedings: Controls on Fault-Hosted Fluid Flow: Preliminary Results from the...
analysis fault reactivation: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
23 24 25 Next Page Last Page Topic Index 81 System level Analysis of Fault Effect in an Automotive Environment CiteSeer Summary: In the last years, new requirements in terms of...
Robust model-based fault diagnosis for chemical process systemsĀ
Rajaraman, Srinivasan
Fault detection and diagnosis have gained central importance in the chemical process industries over the past decade. This is due to several reasons, one of them being that copious amount of data is available from a large ...
Identifying Efficiency Degrading Faults in Split Air Conditioning Systems
Terrill, T. J.; Brown, M. L.; Cheyne, R. W. Jr.; Cousins, A. J.; Daniels, B. P.; Erb, K. L.; Garcia, P. A.; Leutermann, M. J.; Nel, A. J.; Robert, C. L.; Widger, S. B.; Williams, A. G.; Rasmussen, B. P.
Studies estimate that as much as 50% of packaged air conditioning systems operate in faulty conditions that degrade system efficiency. Common faults include: under- and over-charged systems (too much or too little refrigerant), faulty expansions...
Advances in understanding solar energy collection materials
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Understanding solar energy collection materials Advances in understanding solar energy collection materials A LANL team and collaborators have made advances in the understanding of...
Neural net application to transmission line fault detection and classification
Rikalo, Igor
. So far, several NN implementations for various fault diagnosis problems have been reported in the literature. A number of papers describing NN applications in pov er systems categorized in appropriate groups can be found in [19, 20]. 1. 3. Thesis... important issue for stable and reliable operation of pov;er systems. The main target of the fault analysis are circuit breaker and protection relay operations. The task of the analysis is to reach a conclusion about the current state of the electrical...
Two Similarity Measure Approaches to Whole Building Fault Diagnosis
Lin, G.; Claridge, D.
consumption in buildings using similarity measures. The method is referred to as the cosine similarity method if cosine similarity is adopted and is referred to as the Euclidean distance similarity method if Euclidean distance similarity is implemented.... Fig. 1 Block diagram for diagnosing abnormal energy consumption Step 1: Reference Control Change Library Determination Whole building fault diagnosis is different from component level fault diagnosis. It can only give a general clue, for example...
Mechanical properties and fabric of the Punchbowl fault zone, California
Chester, Frederick Michael
MECHANICAL PROPERIIES AND FABRIC OF THE PUiVCHBOlv'L FAULT ZONE, CALIFORNIA A Thesis by FREDERICK MICHAEL CHESTER Subm-', tted to the Graduate College of Texas ABM University in partial fulfillment of the requirements for the degree... of MASTER OF SCIENCE December 1983 Major Subject: Geology MECHANICAL PROPERTIES AND FABRIC OF THE PUNCHBOWL FAULT ZONE, CALIFORNIA A Thesis by FREDERICK MICHAEL CHESTER Approved as to sty1e and content by: on . . an airman o ommittee) Me1vin edman...
Analysis of faults using gravity methods in Mason County, Texas
Milligan, Michael Glen
Committee: Dr. D. A. Fahlquist Dr. B. Johnson The objective of this study is to determine the applicability of gravity profiling methods for determining the location and throw of a series of faults related to a structural graben in northern Mason County... profiles. For two faults with the best geologic control, the best-fit gravity models compared favorably with the the geologic model constructed by Randolph (1991) on the basis of surface mapping, structural control and well control. The gravity models...
The application of satellite time references to HVDC fault location
Dewe, M.B.; Sankar, S.; Arrillaga, J. (Univ. of Canterbury, Christchurch (New Zealand))
An HVdc fault location scheme is described which relies on very precise detection of the time of arrival of fault created surges at both ends of the line. Such detection is achieved by a very accurate data acquisition and processing system combined with the time reference signals provided by a global positioning system receiver. Extensive digital simulation is carried out to determine the voltage and current waveforms, to identify the main sources of error and suggest possible compensation techniques.
Occupancy Based Fault Detection on Building Level - a Feasibility Study
Tuip, B.; Houten, M.; Trcka, M.; Hensen, M.
-going commissioning and fault detection and diagnostics (FDD) has been performed to improve the current situation of building problems by comparing measured building performance with design predictions [Portland 2003]. For fault detection, different methods... conference on building commissioning, Portland Energy Conservation. Portland. 2003. Methods for automated and continuous commissioning of building systems. US department of commerce, Portland energy conservation inc. Schijndel, A.W.M. van, 2008...
Effective Date: MEMORANDUM OF UNDERSTANDING
Effective Date: MEMORANDUM OF UNDERSTANDING Between DEPARTMENT OF TRANSPORTATION FEDERAL AVIATION IN AVIATION AND SPACE TRANSPORTATION I. PURPOSE The Department of TransportatiodFederal Aviation Administration (FAA) and the National Aeronautics and Space Administration (NASA), hereinafter "the Parties
Understanding and Improving Software Productivity
Scacchi, Walt
Understanding and Improving Software Productivity Walt Scacchi Institute for Software Research;2 Introduction Ę What affects software productivity? Ł Software productivity has been one of the most studied aspects of software engineering Ł Goal: review sample of empirical studies of software productivity
Microcomputer applications of, and modifications to, the modular fault trees
Zimmerman, T.L.; Graves, N.L.; Payne, A.C. Jr.; Whitehead, D.W. [Sandia National Labs., Albuquerque, NM (United States)] [Sandia National Labs., Albuquerque, NM (United States)
The LaSalle Probabilistic Risk Assessment was the first major application of the modular logic fault trees after the IREP program. In the process of performing the analysis, many errors were discovered in the fault tree modules that led to difficulties in combining the modules to form the final system fault trees. These errors are corrected in the revised modules listed in this report. In addition, the application of the modules in terms of editing them and forming them into the system fault trees was inefficient. Originally, the editing had to be done line by line and no error checking was performed by the computer. This led to many typos and other logic errors in the construction of the modular fault tree files. Two programs were written to help alleviate this problem: (1) MODEDIT - This program allows an operator to retrieve a file for editing, edit the file for the plant specific application, perform some general error checking while the file is being modified, and store the file for later use, and (2) INDEX - This program checks that the modules that are supposed to form one fault tree all link up appropriately before the files are,loaded onto the mainframe computer. Lastly, the modules were not designed for relay type logic common in BWR designs but for solid state type logic. Some additional modules were defined for modeling relay logic, and an explanation and example of their use are included in this report.
High energy arcing fault fires in switchgear equipment : a literature review.
Nowlen, Steven Patrick; Brown, Jason W.; Wyant, Francis John
In power generating plants, switchgear provide a means to isolate and de-energize specific electrical components and buses in order to clear downstream faults, perform routine maintenance, and replace necessary electrical equipment. These protective devices may be categorized by the insulating medium, such as air or oil, and are typically specified by voltage classes, i.e. low, medium, and high voltage. Given their high energy content, catastrophic failure of switchgear by means of a high energy arcing fault (HEAF) may occur. An incident such as this may lead to an explosion and fire within the switchgear, directly impact adjacent components, and possibly render dependent electrical equipment inoperable. Historically, HEAF events have been poorly documented and discussed in little detail. Recent incidents involving switchgear components at nuclear power plants, however, were scrupulously investigated. The phenomena itself is only understood on a very elementary level from preliminary experiments and theories; though many have argued that these early experiments were inaccurate due to primitive instrumentation or poorly justified methodologies and thus require re-evaluation. Within the past two decades, however, there has been a resurgence of research that analyzes previous work and modern technology. Developing a greater understanding of the HEAF phenomena, in particular the affects on switchgear equipment and other associated switching components, would allow power generating industries to minimize and possibly prevent future occurrences, thereby reducing costs associated with repair and downtime. This report presents the findings of a literature review focused on arc fault studies for electrical switching equipment. The specific objective of this review was to assess the availability of the types of information needed to support development of improved treatment methods in fire Probabilistic Risk Assessment (PRA) for nuclear power plant applications.
The San Andreas Fault System Paul Withers Wallace RE, The San Andreas Fault System, California, USGS Professional Paper 1515,
Withers, Paul
mainland Mexico. The San Andreas fault is commonly referred to as the boundary between the Pacific is correlated with the local geological setting. CO2 lubrication, #12;increased pore pressure, and decreased
Abstract--A method for fault detection and isolation is proposed and applied to inverter faults in multi-phase drives. An
Boyer, Edmond
energy source, a five- leg inverter and a five-phase star-connected PMSM. It has to be noticed that all-magnet synchronous machine (PMSM) drive. The faults under consideration are: open-phase faults and open-switch faults
Unitary reflection groups for quantum fault tolerance
Michel Planat; Maurice R. Kibler
This paper explores the representation of quantum computing in terms of unitary reflections (unitary transformations that leave invariant a hyperplane of a vector space). The symmetries of qubit systems are found to be supported by Euclidean real reflections (i.e., Coxeter groups) or by specific imprimitive reflection groups, introduced (but not named) in a recent paper [Planat M and Jorrand Ph 2008, {\\it J Phys A: Math Theor} {\\bf 41}, 182001]. The automorphisms of multiple qubit systems are found to relate to some Clifford operations once the corresponding group of reflections is identified. For a short list, one may point out the Coxeter systems of type $B_3$ and $G_2$ (for single qubits), $D_5$ and $A_4$ (for two qubits), $E_7$ and $E_6$ (for three qubits), the complex reflection groups $G(2^l,2,5)$ and groups No 9 and 31 in the Shephard-Todd list. The relevant fault tolerant subsets of the Clifford groups (the Bell groups) are generated by the Hadamard gate, the $\\pi/4$ phase gate and an entangling (braid) gate [Kauffman L H and Lomonaco S J 2004 {\\it New J. of Phys.} {\\bf 6}, 134]. Links to the topological view of quantum computing, the lattice approach and the geometry of smooth cubic surfaces are discussed.
Unitary reflection groups for quantum fault tolerance
Planat, Michel
This paper explores the representation of quantum computing in terms of unitary reflections (unitary transformations that leaves invariant a hyperplane of a vector space). The symmetries of qubit systems are found to be supported by Euclidean real reflections (i.e., Coxeter groups) or by specific imprimitive reflection groups, introduced (but not named) in a recent paper [Planat M and Jorrand Ph 2008, J Phys A: Math Theor 41, 182001]. The automorphisms of multiple qubit systems are found to relate to some Clifford operations once the corresponding group of reflections is identified. For a short list, one may point out the Coxeter systems of type B3 and G2 (for single qubits), D5 and A4 (for two qubits), E7 and E6 (for three qubits), and the complex reflection groups G(2l, 2, 5). The relevant fault tolerant groups of reflections (the Bell groups) are generated, as subgroups of the Clifford groups, by the Hadamard gate, the $\\pi$/4 phase gate and an entangling (braid) gate [Kauffman L H and Lomonaco S J 2004 Ne...
Electrical and thermal finite element modeling of arc faults in photovoltaic bypass diodes.
Bower, Ward Isaac; Quintana, Michael A.; Johnson, Jay
Arc faults in photovoltaic (PV) modules have caused multiple rooftop fires. The arc generates a high-temperature plasma that ignites surrounding materials and subsequently spreads the fire to the building structure. While there are many possible locations in PV systems and PV modules where arcs could initiate, bypass diodes have been suspected of triggering arc faults in some modules. In order to understand the electrical and thermal phenomena associated with these events, a finite element model of a busbar and diode was created. Thermoelectrical simulations found Joule and internal diode heating from normal operation would not normally cause bypass diode or solder failures. However, if corrosion increased the contact resistance in the solder connection between the busbar and the diode leads, enough voltage potentially would be established to arc across micron-scale electrode gaps. Lastly, an analytical arc radiation model based on observed data was employed to predicted polymer ignition times. The model predicted polymer materials in the adjacent area of the diode and junction box ignite in less than 0.1 seconds.
Characteristic Evolution and Matching
Jeffrey Winicour
I review the development of numerical evolution codes for general relativity based upon the characteristic initial value problem. Progress is traced from the early stage of 1D feasibility studies to 2D axisymmetric codes that accurately simulate the oscillations and gravitational collapse of relativistic stars and to current 3D codes that provide pieces of a binary black spacetime. A prime application of characteristic evolution is to compute waveforms via Cauchy-characteristic matching, which is also reviewed.
Joint use of network analyzer and digital computer for simultaneous fault determinations
Kilmer, Robert Earl
" on the A, C. Network Calculator. 2. Depending upon the ty?e of faults, the networks are interconnected to satisi'y C . arke'. , equatrcns. Tc com- pletely satrsfy the equations for pecral ccmbrnations oi' fault , such as line-to-ground fault on ph- e a... networks to represent - simultan- eous line-to-ground fault on phase a at point C, and a line ? to-line fault between phases b and c at point D (a); and simultaneous line-to-ground faults on phases a and at points C and D (b). at two points, Fig. 1 b...
Preliminary Expected Performance Characteristics
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
capabilities. To facilitate discussion of the scientific impact and design optimization of such a lattice, this document describes the expected performance characteristics...
Evaluation of a Decoupling-Based Fault Detection and Diagnostic Technique - Part II: Field Evaluation and Application
Li, H.; Braun, J.
Existing methods addressing automated fault detection and diagnosis (FDD) for vapor compression air conditioning system have good performance for faults that occur individually, but they have difficulty in handling multiple-simultaneous faults...
Landscape Scale Impacts of Sea Level Rise and Elevation Changes Along the Matagorda Fault in Matagorda, Texas
Cline, Marie
Movement of growth faults, a type of normal fault which is formed during sedimentation and is characterized by having greater vertical thickness on the downthrown fault side, on barrier islands contributes to wetland losses. The opening objective...
USOSP Agreement MEMORANDUM OF UNDERSTANDING
Rutten, Rob
USO┬ŁSP Agreement USO ┬Ł SP MEMORANDUM OF UNDERSTANDING on UTRECHT ┬Ł STOCKHOLM ┬Ł OSLO COLLABORATION IN SOLAR PHYSICS CONSIDERING that ┬Ł the Solar Physics group of the Sterrekundig Instituut Utrecht, Faculteit Natuur- en Ster- renkunde, Utrecht University, Utrecht, The Netherlands (henceforth abbreviated
Children's Understanding of Animal MindsĀ
Collins, Timothy
This paper examines the development of childrenÆs understanding of animalsÆ minds and mental capabilities over two experiments. Experiment 1 modified standard false-belief and discrepant-desire tasks in two age-groups (3-4 and 7-8 years) to test...
Photobiology Research Understanding fundamental biological
of fuels and chemicals, and understanding electron transport for hybrid generation of solar fuels NREL Ę Characterization and engineering of redox enzymes and proteins for fuel production Ę Genetic and pathway engineering of model organisms to improve production of hydrogen and hydrocarbon fuels Ę Studies
Memorandum of Understanding between the
Doering, Tamara
Memorandum of Understanding between the Ministry of Education, Republic of China (Taiwan. Joint selection of scholars will be made by MOE and WUSTL before the end of March each year. 8) Costs and administration The total costs of each scholarship will be divided in the ratio 1:1 between MOE and WUSTL. MOE
Klippel, Alexander
-001- USING SPACE SYNTAX TO UNDERSTAND KNOWLEDGE ACQUISITION AND WAYFINDING IN INDOOR email@example.com Abstract It is critical to understand how characteristics of environment influence human acquisition descriptions of environments and predicating wayfinding behaviors. From the perspective of cognitive geography
Klippel, Alexander
USING SPACE SYNTAX TO UNDERSTAND KNOWLEDGE ACQUISITION AND WAYFINDING IN INDOOR ENVIRONMENTS Rui firstname.lastname@example.com Abstract It is critical to understand how characteristics of environment influence human acquisition descriptions of environments and predicating wayfinding behaviors. From the perspective of cognitive geography
Paris-Sud XI, Universitķ de
ADECENTRALIZED APPROACH TOWARDS AUTONOMOUS FAULT DETECTION IN WIRELESS STRUCTURAL HEALTH MONITORING structural health monitoring (SHM) systems may reduce the monitoring quality and, if remaining undetected : Autonomous fault detection, structural health monitoring, wireless sensor networks, smart sensors, analytical
A methodology for experimentally verifying simulation models for distribution transformer internal faults
Palmer-Buckle, Peter
Internal winding faults comprise 70-80% of modem transformer breakdown. In this era of deregulation, this phenomenon is likely to increase since loading transformers to their optimum capacity is becoming normal practice. These internal faults result...
The dynamics of oceanic transform faults : constraints from geophysical, geochemical, and geodynamical modeling
Gregg, Patricia Michelle Marie
Segmentation and crustal accretion at oceanic transform fault systems are investigated through a combination of geophysical data analysis and geodynamical and geochemical modeling. Chapter 1 examines the effect of fault ...
Slip on ridge transform faults : insights from earthquakes and laboratory experiments
Boettcher, Margaret S
The relatively simple tectonic environment of mid-ocean ridge transform fault (RTF) seismicity provides a unique opportunity for investigation of earthquake and faulting processes. We develop a scaling model that is complete ...
On strong fault tolerance (or strong Menger-connectivity) of multicomputer networksĀ
Oh, Eunseuk
As the size of networks increases continuously, dealing with networks with faulty nodes becomes unavoidable. In this dissertation, we introduce a new measure for network fault tolerance, the strong fault tolerance (or ...
Finite element analysis of elastic interaction of two en echelon overlapping faults
Leem, Junghun
The primary objective is the analysis of the elastic stress fields and prediction of incipient secondary faulting associated with the interaction of two overlapping, en echelon faults with a sense of stepover opposite to the sense of shear...
The structure and evolution of small-displacement strike-slip faults in porous sandstone
Schafer, Kirk Wyatt
The early-evolution of fault structure is inferred from analysis of detailed maps of portions of strike-slip faults with uniform displacements ranging from mm to decimeter in porous quartzose sandstone. Emphasis is on assessing the spatial...
Effects of burial history, rock ductility and recovery magnitude on inversion of normal faulted strata
Kuhle, Nathan John
Inversion of normal faults at different burial depths is studied using physical models constructed with rock and deformed at confining pressure. Models consist of a 1 cm thick limestone layer above a fault dipping 70░ in a rigid medium...
Initiation propagation and termination of elastodynamic ruptures associated with segmentation of faults and shaking
Shaw, Bruce E.
Initiation propagation and termination of elastodynamic ruptures associated with segmentation the initiation, propagation, and termination of ruptures and their relationship to fault geometry and shaking of terminations near fault ends; and persistent propagation directivity effects. Taking advantage of long
Advanced fault diagnosis techniques and their role in preventing cascading blackouts
Zhang, Nan
This dissertation studied new transmission line fault diagnosis approaches using new technologies and proposed a scheme to apply those techniques in preventing and mitigating cascading blackouts. The new fault diagnosis approaches are based on two...
Fault-tolerant Partial-resonant High-frequency AC-link Converters and Their Applications
Keyhani, Hamidreza
concerns in addition to voltage and current scalabilities. Moreover, fault tolerance of power converters is becoming more and more essential in many applications, such as aerospace and subsea systems. Fault tolerance involves the detection...
Impact of Installation Faults on Heat Pump Performance
Hourahan, Mr. Glenn [Air Conditioning Contractors of America, Arlington, VA; Baxter, Van D [ORNL
Numerous studies and surveys indicate that typically-installed HVAC equipment operate inefficiently and waste considerable energy due to varied installation errors (faults) such as improper refrigerant charge, incorrect airflow, oversized equipment, and leaky ducts. This article summarizes the results of a large United States (U.S.) experimental/analytical study (U.S. contribution to IEA HPP Annex 36) of the impact that different faults have on the performance of an air-source heat pump (ASHP) in a typical U.S. single-family house. It combines building effects, equipment effects, and climate effects in an evaluation of the faults impact on seasonal energy consumption through simulations of the house/ASHP pump system.
Detection of Rooftop Cooling Unit Faults Based on Electrical Measurements
Armstrong, Peter R.; Laughman, C R.; Leeb, S B.; Norford, L K.
Non-intrusive load monitoring (NILM) is accomplished by sampling voltage and current at high rates and reducing the resulting start transients or harmonic contents to concise ''signatures''. Changes in these signatures can be used to detect, and in many cases directly diagnose, equipment and component faults associated with roof-top cooling units. Use of the NILM for fault detection and diagnosis (FDD) is important because (1) it complements other FDD schemes that are based on thermo-fluid sensors and analyses and (2) it is minimally intrusive (one measuring point in the relatively protected confines of the control panel) and therefore inherently reliable. This paper describes changes in the power signatures of fans and compressors that were found, experimentally and theoretically, to be useful for fault detection.
Characteristic Evolution and Matching
Jeffrey Winicour
I review the development of numerical evolution codes for general relativity based upon the characteristic initial value problem. Progress in characteristic evolution is traced from the early stage of 1D feasibility studies to 2D axisymmetric codes that accurately simulate the oscillations and gravitational collapse of relativistic stars and to current 3D codes that provide pieces of a binary black hole spacetime. Cauchy codes have now been successful at simulating all aspects of the binary black hole problem inside an artificially constructed outer boundary. A prime application of characteristic evolution is to extend such simulations to null infinity where the waveform from the binary inspiral and merger can be unambiguously computed. This has now been accomplished by Cauchy-characteristic extraction, where data for the characteristic evolution is supplied by Cauchy data on an extraction worldtube inside the artificial outer boundary. The ultimate application of characteristic evolution is to eliminate the role of this outer boundary by constructing a global solution via Cauchy-characteristic matching. Progress in this direction is discussed.
Multi-sensor Wireless System for Fault Detection in Induction Motors
Tarkesh Esfahani, Ehsan
Rotor bar damage and Stator winding imbalance, in the fault3) Bearing damage 4) Stator winding imbalance [2]. These
Recognition criteria for young multiple surface ruptures along the Meers fault in southwestern Oklahoma
Westen, Diane Paula
fault planes in a stream cut exposure in young unconsolidated alluvium, and the possibility of segmentation based on changes in fault strike. The evidence suggests that abrupt, discrete stress-release events break the surface along different scarp-lines...) recognized the fault trace as a straight, continuous line cutting Permian sediments, remarkably fresh in appearance. He postulated that the fault was associated with intense orogenic movement of a deep-seated origin. Subsequent authors have associated...
Method of detecting the direction of arcing faults on power distribution feeders
Fernando, W. Anand Krisantha
lines served by the same substation, resulting in false indications on the other feeders, in the case of an arcing fault. Two primary methods of detecting directionality of power system faults exist, impedance relaying and traveling wave relaying... is of significant magnitude to cause a current reversal in the case of a reverse fault [18]. 2. Traveling Wave Relaying The need for more accurate and fast detection of fault and direction of very high voltage transmission lines, was the base of invention...
Induced seismicity within geologic carbon sequestration projects: Maximum earthquake magnitude and leakage potential from undetected faults
Mazzoldi, A.P.
data from reservoir and outcrop samples suggest a general decrease in fault-zone permeability with increasing shale
IEEE TRANSACTIONS ON POWER ELECTRONICS 1 A Fault-Tolerant Switching Scheme for an Isolated
Mazumder, Sudip K.
a model- reference adaptive system-based fault diagnosis algorithm for a VSI used as a PMSM drive system
Fault-Tolerant Quantum Computation via Exchange interactions
M. Mohseni; D. A. Lidar
Quantum computation can be performed by encoding logical qubits into the states of two or more physical qubits, and controlling a single effective exchange interaction and possibly a global magnetic field. This "encoded universality" paradigm offers potential simplifications in quantum computer design since it does away with the need to perform single-qubit rotations. Here we show that encoded universality schemes can be combined with quantum error correction. In particular, we show explicitly how to perform fault-tolerant leakage correction, thus overcoming the main obstacle to fault-tolerant encoded universality.
06241 Abstracts Collection Human Motion -Understanding, Modeling,
06241 Abstracts Collection Human Motion - Understanding, Modeling, Capture and Animation. 13th Summary Human Motion - Understanding, Modeling, Capture and Animation. 13th Workshop Reinhard Klette 06241 Human Motion - Understanding, Modeling, Capture and Animation. 13th Workshop "Theoretical
Mineralogical characterization of protolith and fault rocks from the SAFOD Main Hole
Mineralogical characterization of protolith and fault rocks from the SAFOD Main Hole John G. Solum influence is not yet fully known. Faults containing these mineralogical phases are prime candidates), Mineralogical characterization of protolith and fault rocks from the SAFOD Main Hole, Geophys. Res. Lett., 33, L
Modeling induction machine winding faults for diagnosis In Electrical Machines Diagnosis
Paris-Sud XI, Universitķ de
Chapter 2 Modeling induction machine winding faults for diagnosis In Electrical Machines Diagnosis of a winding fault situation, then the time available to the experimenter may vary from a few minutes to a few will see that the controls are perfectly free from imbalances induced by a stator insulation fault, whether
Induction Machine Fault Detection Enhancement Using a Stator Current High Resolution Spectrum
Paris-Sud XI, Universitķ de
into stator winding short circuit, broken rotor bar, broken end-ring, rotor eccentricity, bearing faultsInduction Machine Fault Detection Enhancement Using a Stator Current High Resolution Spectrum El-Fault detection in squirrel cage induction machines based on stator current spectrum has been widely investi gated
Shallow soil CO2 flow along the San Andreas and Calaveras Faults, California
Hilley, George
Shallow soil CO2 flow along the San Andreas and Calaveras Faults, California J. L. Lewicki,1,2 W. C soil CO2 survey along the San Andreas fault (SAF) in Parkfield, and the Calaveras fault (CF) in Hollister, California, in the context of spatial and temporal variability, origin, and transport of CO2
Late quaternary activity of the Laguna Salada fault in northern Baja California, Mexico
Mueller, Karl
northwest-striking dextral and oblique-slip faults. These include the Imperial, Cerro Prieto, Cucapa, Im- perial, and Cerro Prieto dextral faults. Re- straining stepovers along active dextral fault zones present in the Imperial and Mexicali Valleys include the Brawley and Cerro Pri- eto spreading centers (Fig
What about vulnerability to a fault attack of the Miller algorithm during an
Paris-Sud XI, Universit├® de
What about vulnerability to a fault attack of the Miller algorithm during an Identity Based is to analyse the weakness of the Miller algorithm when it undergoes a fault attack. We prove that the Miller algorithm is vulnerable to a fault attack which is valid in all coordinate systems, through the resolution
What About Vulnerability to a Fault Attack of the Miller's Algorithm During an
Paris-Sud XI, Universit├® de
What About Vulnerability to a Fault Attack of the Miller's Algorithm During an Identity Based of this article is to analyse the weakness of the Miller's algorithm when it undergoes a fault attack. We prove that the Miller's algorithm is vulnerable to a fault attack which is valid in all coordinate systems, through
State of the art analysis of online fault location on AC cables in underground transmission systems
Bak, Claus Leth
on transmission level fault location methods have been focused on overhead lines. Because of the very different- termine the fault location. Because only one end meas- urements are used, the algorithm is derived usingState of the art analysis of online fault location on AC cables in underground transmission systems
Detection and extraction of fault surfaces in 3D seismic data Israel Cohen1
Cohen, Israel
for seismic interpretation. INTRODUCTION Fault surfaces are common subterranean structures that are asso that are unrelated to faults. Furthermore, creating a consistent geological interpretation from large 3D-seismicDetection and extraction of fault surfaces in 3D seismic data Israel Cohen1 , Nicholas Coult2
Coulomb and viscous friction fault detection with application to a pneumatic actuator
Dunbar, William
Coulomb and viscous friction fault detection with application to a pneumatic actuator W.B. Dunbar of friction (fault) presented in this paper could facilitate the compensation of dry friction in high precision position- ing mechanisms. Moreover, a fault detection technique for monitoring dry friction would
Acoustic Emission, Cylinder Pressure and Vibration: A Multisensor Approach to Robust Fault Diagnosis \\Lambda
Sharkey, Amanda
of a diesel engine and 4 fault conditions, Artificial Neural Nets based on data from any one of these three and challenging task for Artificial Neural Nets (ANNs) is the on┬Łline fault dia┬Ł gnosis of a diesel engine. One way of meeting this challenge is to physically induce faults in a diesel engine, to collect data
Voltage grid support of DFIG wind turbines during grid faults Anca D. Hansen1
Voltage grid support of DFIG wind turbines during grid faults Anca D. Hansen1 , Gabriele Michalke2 Abstract The fault ride-through and grid support capabilities of the doubly fed induction generator (DFIG and their contribution to support the grid, i.e. to the voltage control in the power system, during grid faults
Oil and Gas CDT Bots in Rocks: Intelligent Rock Deformation for Fault Rock
Henderson, Gideon
Heriot-Watt University, Institute of Petroleum Engineering Supervisory Team Ę Dr Helen Lewis, Heriot://www.pet.hw.ac.uk/staff-directory/jimsomerville.htm Key Words Nano/Micro sensors; faults; fault zones; geomechanics; rock mechanics; rock deformation-deformed equivalent, a different lab-deformed example and a geomechanical simulation of a fault zone showing permanent
PWM Inverter-Fed Induction Motor-Based Electrical Vehicles Fault-Tolerant Control
Paris-Sud XI, Universitķ de
and particularly on the power inverter is rapidly increasing the concern over fault tolerance due to availability faults that could afflict a power inverter. Two common types of power converter faults that were. Several power inverter architecture based on some hardware redundancy have been suggested to add
HTP in Positive Characteristic HTP in Positive Characteristic
Shlapentokh, Alexandra
HTP in Positive Characteristic HTP in Positive Characteristic Alexandra Shlapentokh East Carolina University April 2012 #12;HTP in Positive Characteristic Prologue Outline 1 Prologue 2 Fields of Positive Function Fields of Positive Characteristic 7 p-th Powers #12;HTP in Positive Characteristic Prologue
This report, Housing Characteristics 1993, presents statistics about the energy-related characteristics of US households. These data were collected in the 1993 Residential Energy Consumption Survey (RECS) -- the ninth in a series of nationwide energy consumption surveys conducted since 1978 by the Energy Information Administration of the US Department of Energy. Over 7 thousand households were surveyed, representing 97 million households nationwide. A second report, to be released in late 1995, will present statistics on residential energy consumption and expenditures.
Memorandum of Understanding | Department of Energy
Broader source: Energy.gov (indexed) [DOE]
Between The Department Of The Navy And The Department of Energy And the Department of Agriculture Memorandum of Understanding Memorandum of understanding between DOE and NGLIA...
Vehicle Technologies Office Merit Review 2014: Understanding...
Office of Environmental Management (EM)
Understanding Protective Film Formation on Magnesium Alloys in Automotive Applications Vehicle Technologies Office Merit Review 2014: Understanding Protective Film Formation on...
Hermeneutics: From Textual Explication to Computer Understanding?
Mallery, John C.
Hermeneutics, a branch of continental European philosophy concerned with human understanding and the interpretation of written texts, offers insights that may contribute to the understanding of meaning, translation, ...
Structure of the eastern Red Rocks and Wind Ridge thrust faults, Wyoming: how a thrust fault gains displacement along strike
Huntsman, Brent Stanley
displacement along strike . . . . . . . . . . . . 56 Figure 17 Horizontal shortening 1n the direction of tectonic transport along strike of the Red Rocks fault with Elliot's ( 1976) line 60 F1gure 18: Shorten1ng along strike of precuts 1n clay model 2... with Elliot's ( 1976) line . 61 F1gure 19 The approx1mate position of the Red Rocks fault in O'Keefe's ( 1980) three end-member class1ficat1on of displacement transfer zones . . . . . . . . . . . . . . . . . . . 64 LIST OF TABLES Table 1: Stratigraphic...
Active Probing Approach for Fault Localization in Computer Networks*
Sethi, Adarshpal
to develop tools for performing fault localization. We discuss various design issues involved and propose architecture for building such a tool. We describe an algorithm for probe set selection for problem detection a wide range of activities involving network design and operation [7, 9, 17, 18]. Network monitoring can
Real Time Control Design for Mobile Robot Fault Tolerant Control.
Kuehnlenz, Kolja
Mobile Robot. Cristian Axenie Automation and Industrial Informatics Department Razvan Solea, Lecturer, Ph-time distributed control application with fault tolerance capabilities for differential wheeled mobile robots mobile robot the author has been able to develop a hierarchical software application that minimizes costs
Development and Application of Nonlinear PCA for Fault
Gorban, Alexander N.
Development and Application of Nonlinear PCA for Fault Diagnosis in Internal Combustion Engines Uwe to an Internal Combustion Engine Ę Conclusions and Future Challenges #12;Slide 3 Uwe Kruger Development Kruger School of Electronics, Electrical Engineering & Computer Science Ashby Building Stranmillis Road
Microstructures and Rheology of a Limestone-Shale Thrust FaultĀ
Wells, Rachel Kristen
thick calcite and shale shear zone suggest that calcite, not shale, controlled the rheology of the shear zone rocks. While shale deformed brittley, plasticity-induced fracturing in calcite resulted in ultrafine-grained (<1.0 ?m) fault rocks that deformed...
Wind Energy Conversion Systems Fault Diagnosis Using Wavelet Analysis
Paris-Sud XI, Universitķ de
Wind Energy Conversion Systems Fault Diagnosis Using Wavelet Analysis Elie Al-Ahmar1,2 , Mohamed El, induction generator, Discrete Wavelet Transform (DWT), failure diagnosis. I. Introduction Wind energy the condition of induction machines. Fig. 1. Worldwide growth of wind energy installed capacity [1]. 1 E. Al
anatolian fault turkey: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
anatolian fault turkey First Page Previous Page 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Next Page Last Page Topic Index 1 Morphology, displacement, and...
Principal Component Analysis for Fault Detection and Structure Health Monitoring
Paris-Sud XI, Universitķ de
Principal Component Analysis for Fault Detection and Structure Health Monitoring Nicolas Stoffels structure to ensure its health monitoring. The proposed approach is based on the PCA algorithm. Once PCA promptly and precisely [5]. FDI is also important in SHM (Structure Health Monitoring) because of aging
Combining Tools for the Verification of FaultTolerant Systems
Peleska, Jan - Fachbereich 3
and verification of faultŁtolerant systems according to the invent&verify paradigm. Our method is based on the CSP specifications (CSP process terms), refinement relations or combinations of these three description formalisms specification paradigms acŁ cording to the specific needs of each development step is essential to cope
Fault prediction in aircraft engines using Self-Organizing Maps
Paris-Sud XI, Universitķ de
Fault prediction in aircraft engines using Self- Organizing Maps Marie Cottrell1 , Patrice Gaubert1. Aircraft engines are designed to be used during several tens of years. Their maintenance is a challenging and costly task, for obvious security reasons. The goal is to ensure a proper operation of the engines
Influence of plastic deformation on bimaterial fault rupture directivity
Dmowska, Renata
Influence of plastic deformation on bimaterial fault rupture directivity Nora DeDontney,1 Elizabeth of the role of the stress state on the distribution of plastic deformation and the direction of preferred in determining the location of plastic deformation. For different orientations, plastic deformation can
Occupancy Based Fault Detection on Building Level - a Feasibility StudyĀ
Tuip, B.; Houten, M.; Trcka, M.; Hensen, M.
Occupancy based fault detection on building level ? a feasibility study B.G.C.C. Tuip BSc. dr.ir. M.A. v. Houten dr. Dipl.-Ing. M. Trcka prof.dr.ir. J.L.M. Hensen Unit Building Performance and Systems Eindhoven University of Technology...
Statistical Approaches to Fault Analysis in Multivariate Process Control
Ungar, Lyle H.
Statistical Approaches to Fault Analysis in Multivariate Process Control Richard D. De Veaux Lyle H Abstract After a brief review of some statistical approaches to multivariate process control, we present analysis or partial least squares to limit the number of latent variables to study. While using historical
Test Case Purification for Improving Fault Localization Jifeng Xuan
Test Case Purification for Improving Fault Localization Jifeng Xuan INRIA Lille - Nord Europe Lille on the execution trace of test cases. Failing test cases and their assertions form test oracles for the failing behavior of the system under analysis. In this paper, we propose a novel concept of spectrum driven test
A Tool for Efficient Fault Tree Analysis (extended version)
Vellekoop, Michel
, medical equipment, and power grids are dependable. Also, risk management is often required by law. Fault like system reliability and availability. This paper presents DFTCalc, a powerful tool for FTA the underlying state space small. 1 Introduction Risk analysis is a key feature in reliability engineering
and control, nuclear reactor safety systems and aircraft landing systems. For systems of failure in operations. For example a nuclear reactor shutdown system should fail at a rate which Abstract. A theory underlying application of automatic fault tree analysis to computer programs
A Low Overhead Fault Tolerant Coherence Protocol for CMP Architectures
Balasubramonian, Rajeev
, the reliability of electronic components is never perfect. Electronic components are subject to sev- eral types to deal with these faults to be able to build sufficiently reliable Chip Multi- processors (CMPs the interconnection network of a CMP, thus assuming that the network is no longer reliable. In particular, our pro
Fault properties from seismic Q M. H. Worthington1
Cambridge, University of
«cally concerned with the analysis and interpretation of some vertical seismic pro«ling (VSP) data from a holeFault properties from seismic Q M. H. Worthington1 and J. A. Hudson2 1 T. H. Huxley School of seismic Q from a North Sea vertical seismic pro«ling data set has revealed an abrupt increase
Module Placement for Fault-Tolerant Microfluidics-Based Biochips
Chakrabarty, Krishnendu
Module Placement for Fault-Tolerant Microfluidics-Based Biochips FEI SU and KRISHNENDU CHAKRABARTY Duke University Microfluidics-based biochips are soon expected to revolutionize clinical diagnosis, DNA sequencing, and other laboratory procedures involving molecular biology. Most microfluidic biochips today
Motion and evolution of the Chaochou Fault, Southern Taiwan
Hassler, Lauren E.
has been called the Chuchi Transfer Fault Zone (Lacombe et al., 2001). This boundary represents a major change in the character of seismicity in Taiwan. Although the nature of this boundary is not known, it may represent the southern extent of direct...
A Fault Model and Mutation Testing of Access Control Policies
Xie, Tao
A Fault Model and Mutation Testing of Access Control Policies Evan Martin and Tao Xie Dept (responses) against expected ones. Unfortunately, manual testing is tedious and few tools exist for automated in web applications. It controls which principals such as users or processes have access to which re
High voltage fault current limiter having immersed phase coils
Darmann, Francis Anthony
A fault current limiter including: a ferromagnetic circuit formed from a ferromagnetic material and including at least a first limb, and a second limb; a saturation mechanism surrounding a limb for magnetically saturating the ferromagnetic material; a phase coil wound around a second limb; a dielectric fluid surrounding the phase coil; a gaseous atmosphere surrounding the saturation mechanism.
Adaptive Fault Tolerance in Real Time Cloud Computing Sheheryar Malik
Paris-Sud XI, Universitķ de
Adaptive Fault Tolerance in Real Time Cloud Computing Sheheryar Malik Research Team OASIS firstname.lastname@example.com Abstract -- With the increasing demand and benefits of cloud computing infrastructure, real time computing can be performed on cloud infrastructure. A real time system can take advantage of intensive computing
Fault-Tolerant and Reliable Computation in Cloud Computing
Deng, Jing
Fault-Tolerant and Reliable Computation in Cloud Computing Jing Deng Scott C.-H. Huang Yunghsiang S, Taipei, 106 Taiwan. ¦ Intelligent Automation, Inc., Rockville, MD, USA. Abstract-- Cloud computing of scientific computation in cloud computing. We investigate a cloud selection strategy to decompose the matrix
Observability of Stuck-at-Faults with Differential Power Analysis
Boyer, Edmond
,flottes,firstname.lastname@example.com Abstract In this paper we propose an innovative method to test integrated circuits based on the use of the current consumed by the circuit during net transitions, it does not require observing primary outputs of the circuit and allows the test of hard-to-observe faults. Conversely to Iddq, this technique is not sensible
How to Generate Fault Trees from Causal In uence Diagrams
Ladkin, Peter B.
. 1 #12; Hydrocarbon in Steam in Catalyst in Vent 1 Vent 2 Product out Tank Pressure controller Handbook [VGRH81], written by some of the original developers of fault tree methodology in the nuclear; Explosion Pressure too high PRV 1 does not open PRV 2 does not open Valve failure Operator does not know
Permanent Magnets Synchronous Machines Faults Detection and Identification
Paris-Sud XI, Universit├® de
for permanent magnet synchronous machines (PMSM). Two main faults occurring on these machines are identified of the PMSM is devel- oped and simulated using Matlab Simulink. The model enables simulating nominal and faulty PMSM behavior, with several stages of degradation, and is supported by tests results. Specific
Thrust faulting in Temblor Range, Kern County, California
Simonson, R.R.
Surface and subsurface studies confirm the presence of overthrusting in the Temblor Range between Gonyer Canyon and Recruit Pass. In the subsurface, three wells have penetrated the Cree fault, the Hudbay Cree' No. 1 (7,300 ft), the Frantzen Oil Company Cree' No. 1 (5,865 ft) and the Arco Cree Fee' 1A well (5,915 ft). Below the fault, 25 to 35{degree} of westerly dips on the west flank of the sub-thrust Phelps anticline are encountered. The McDonald section below the fault is comprised of siliceous fractured shale which contains live oil and gas showings. A drill-stem test of the interval from 8,247 to 8,510 ft in the Frantzen well resulted in a recovery of 1,200 ft clean 34{degree} oil and 40 MCF per day gas. The shut in pressure was 3,430 lb, which is a normal hydrostatic pressure common to the producing structures in the southern San Joaquin Valley. The equivalent of this interval has produced over 7,000 bbl of oil in the Arco Cree' 1A well. The Arco Cree Fee' No. 1A well crossed the axis of the Phelps Anticline as indicated by good dipmeter and bottomed in Lower Zemorrian at 14,512 ft total depth. This well was not drilled deep enough to reach the Point of Rocks Sand and did not test the gas showings in the lower Miocene section. In the Gonyer Canyon area, subsurface evidence indicated conditions are similar to those in the Cree area because a large structure is present below a thrust fault. It is believed that significant accumulations will be found beneath thrust faults in the eastern part of the Temblor Range where conditions are similar to those that were instrumental in forming fields such as the Elk Hills, B. V. Hills, Belgian Anticline and others.
Characterization of Quaternary and suspected Quaternary faults, regional studies, Nevada and California
Anderson, R.E.; Bucknam, R.C.; Crone, A.J.; Haller, K.M.; Machette, M.N.; Personius, S.F.; Barnhard, T.P.; Cecil, M.J.; Dart, R.L.
This report presents the results of geologic studies that help define the Quaternary history of selected faults in the region around Yucca Mountain, Nevada. These results are relevant to the seismic-design basis of a potential nuclear waste repository at Yucca Mountain. The relevancy is based, in part, on a need for additional geologic data that became apparent in ongoing studies that resulted in the identification of 51 relevant and potentially relevant individual and compound faults and fault zones in the 100-km-radius region around the Yucca Mountain site. Geologic data used to characterize the regional faults and fault zones as relevant or potentially relevant seismic sources includes age and displacement information, maximum fault lengths, and minimum distances between the fault and the Yucca Mountain site. For many of the regional faults, no paleoseismic field studies have previously been conducted, and age and displacement data are sparse to nonexistent. In November 1994, the Branch of Earthquake and Landslide Hazards entered into two Memoranda of Agreement with the Yucca Mountain Project Branch to conduct field reconnaissance, analysis, and interpretation of six relevant and six potentially relevant regional faults. This report describes the results of study of those faults exclusive of those in the Pahrump-Stewart Valley-Ash Meadows-Amargosa Valley areas. We also include results of a cursory study of faults on the west flank of the Specter Range and in the northern part of the Last Chance Range. A four-phase strategy was implemented for the field study.
Development of Asset Fault Signatures for Prognostic and Health Management in the Nuclear Industry
Vivek Agarwal; Nancy J. Lybeck; Randall Bickford; Richard Rusaw
Proactive online monitoring in the nuclear industry is being explored using the Electric Power Research InstituteÆs Fleet-Wide Prognostic and Health Management (FW-PHM) Suite software. The FW-PHM Suite is a set of web-based diagnostic and prognostic tools and databases that serves as an integrated health monitoring architecture. The FW-PHM Suite has four main modules: Diagnostic Advisor, Asset Fault Signature (AFS) Database, Remaining Useful Life Advisor, and Remaining Useful Life Database. This paper focuses on development of asset fault signatures to assess the health status of generator step-up generators and emergency diesel generators in nuclear power plants. Asset fault signatures describe the distinctive features based on technical examinations that can be used to detect a specific fault type. At the most basic level, fault signatures are comprised of an asset type, a fault type, and a set of one or more fault features (symptoms) that are indicative of the specified fault. The AFS Database is populated with asset fault signatures via a content development exercise that is based on the results of intensive technical research and on the knowledge and experience of technical experts. The developed fault signatures capture this knowledge and implement it in a standardized approach, thereby streamlining the diagnostic and prognostic process. This will support the automation of proactive online monitoring techniques in nuclear power plants to diagnose incipient faults, perform proactive maintenance, and estimate the remaining useful life of assets.
Generalized Standby-Sparing Techniques for Energy-Efficient Fault Tolerance in Multiprocessor Real-Time Systems
Aydin, Hakan
Generalized Standby-Sparing Techniques for Energy-Efficient Fault Tolerance in Multiprocessor Real-Sparing (SS) technique has been pre- viously explored to improve energy efficiency while providing fault faults, we develop energy-efficient fault tolerance techniques for real-time systems deploying
Commercial Buildings Characteristics, 1992
Not Available
Commercial Buildings Characteristics 1992 presents statistics about the number, type, and size of commercial buildings in the United States as well as their energy-related characteristics. These data are collected in the Commercial Buildings Energy Consumption Survey (CBECS), a national survey of buildings in the commercial sector. The 1992 CBECS is the fifth in a series conducted since 1979 by the Energy Information Administration. Approximately 6,600 commercial buildings were surveyed, representing the characteristics and energy consumption of 4.8 million commercial buildings and 67.9 billion square feet of commercial floorspace nationwide. Overall, the amount of commercial floorspace in the United States increased an average of 2.4 percent annually between 1989 and 1992, while the number of commercial buildings increased an average of 2.0 percent annually.
Integrated fault seal analysis and risk assessemt: Okan and Meren Fields, Nigeria
Eisenberg, R.A. [Chevron Petroleum Technology, Co., La Habra, CA (United States); Brenneman, R.J. [Chevron Overseas Petroleum Co., San Ramon, CA (United States); Adepoju, A.A. [Chevron Nigeria Ltd., Lagos (Nigeria)
Integration of production, geochemical, seismic, well log, and structural data provides important constraints on the sealing capacity and dynamic behavior of fault juxtaposed reservoirs in Okan and Meren fields, offshore Nigeria. Correlations were found between pressure decline histories, juxtaposed fluid types, oil composition, fluid contact relationships, fault sealing/leaking condition, and estimates of the composition of the fault gouge. Fault plane sections defined reservoir juxtapositions and potential cross-fault spill points. Smear gouge ratios calculated from E-logs were used to estimate the composition of fault-gouge materials between juxtaposed reservoirs. These tools augmented interpretation of seal/nonseal character in proved reservoirs and were used to quantify fault seal risk of untested, fault-dependent closures. In the Okan Field juxtapositions of the G-, H, L-, M, and O-sands were analyzed. Smear gouge ratios correlated to fluid contact relationships and pressure decline histories within these juxtaposed reservoirs empirically calibrate sealing potential. The results of these analyses were then used to interpret production-induced fault seal breakdown within the G-sands and to risk seal integrity of fault-dependent closures within the untested 0-sands in an adjacent, upthrown fault block. Within this fault block the presence of potential fault intersection leak points and large areas of sand/sand juxtaposition with high smear gouge ratios (low sealing potential) limits column heights and potential reserves within the O-sand package. In the Meren Field the E- and G-sands are juxtaposed, on different pressure decline, geochemically distinct, and are characterized by low smear gouge ratios. In contrast, the G- and H-sands, juxtaposed across the same fault, contain similar OOWCs and are characterized by high smear gouge ratios.
Integrated fault seal analysis and risk assessemt: Okan and Meren Fields, Nigeria
Eisenberg, R.A. (Chevron Petroleum Technology, Co., La Habra, CA (United States)); Brenneman, R.J. (Chevron Overseas Petroleum Co., San Ramon, CA (United States)); Adepoju, A.A. (Chevron Nigeria Ltd., Lagos (Nigeria))
Integration of production, geochemical, seismic, well log, and structural data provides important constraints on the sealing capacity and dynamic behavior of fault juxtaposed reservoirs in Okan and Meren fields, offshore Nigeria. Correlations were found between pressure decline histories, juxtaposed fluid types, oil composition, fluid contact relationships, fault sealing/leaking condition, and estimates of the composition of the fault gouge. Fault plane sections defined reservoir juxtapositions and potential cross-fault spill points. Smear gouge ratios calculated from E-logs were used to estimate the composition of fault-gouge materials between juxtaposed reservoirs. These tools augmented interpretation of seal/nonseal character in proved reservoirs and were used to quantify fault seal risk of untested, fault-dependent closures. In the Okan Field juxtapositions of the G-, H, L-, M, and O-sands were analyzed. Smear gouge ratios correlated to fluid contact relationships and pressure decline histories within these juxtaposed reservoirs empirically calibrate sealing potential. The results of these analyses were then used to interpret production-induced fault seal breakdown within the G-sands and to risk seal integrity of fault-dependent closures within the untested 0-sands in an adjacent, upthrown fault block. Within this fault block the presence of potential fault intersection leak points and large areas of sand/sand juxtaposition with high smear gouge ratios (low sealing potential) limits column heights and potential reserves within the O-sand package. In the Meren Field the E- and G-sands are juxtaposed, on different pressure decline, geochemically distinct, and are characterized by low smear gouge ratios. In contrast, the G- and H-sands, juxtaposed across the same fault, contain similar OOWCs and are characterized by high smear gouge ratios.
Understanding flavour at the LHC
Huge progress in flavour physics has been achieved by the two B-factories and the Tevatron experiments. This progress has, however, deepened the new physics flavour puzzle: If there is new physics at the TeV scale, why aren't flavour changing neutral current processes enhanced by orders of magnitude compared to the standard model predictions? The forthcoming ATLAS and CMS experiments can potentially solve this puzzle. Perhaps even more surprisingly, these experiments can potentially lead to progress in understanding the standard model flavour puzzle: Why is there smallness and hierarchy in the flavour parameters? Thus, a rich and informative flavour program is awaiting us not only in the flavour-dedicated LHCb experiment, but also in the high-pT ATLAS and CMS experiments.
Concrete Pavement Surface Characteristics
, Broom, Belt, Carpet) Shot Peened Exposed Aggregate Porous (Pervious) Concrete Milled HMA and SurfaceImproving Concrete Pavement Surface Characteristics Pooled Fund TPF-5(139) National Concrete do with this knowledge? #12;Better Design and Construction Practices for Texturing Concrete Pavement
Topological fault-tolerance in cluster state quantum computation
Robert Raussendorf; Jim Harrington; Kovid Goyal
We describe a fault-tolerant version of the one-way quantum computer using a cluster state in three spatial dimensions. Topologically protected quantum gates are realized by choosing appropriate boundary conditions on the cluster. We provide equivalence transformations for these boundary conditions that can be used to simplify fault-tolerant circuits and to derive circuit identities in a topological manner. The spatial dimensionality of the scheme can be reduced to two by converting one spatial axis of the cluster into time. The error threshold is 0.75% for each source in an error model with preparation, gate, storage and measurement errors. The operational overhead is poly-logarithmic in the circuit size.
Topological fault-tolerance in cluster state quantum computation
Raussendorf, R; Harrington, J; Goyal, Kovid; Harrington, Jim; Raussendorf, Robert
We describe a fault-tolerant version of the one-way quantum computer using a cluster state in three spatial dimensions. Topologically protected quantum gates are realized by choosing appropriate boundary conditions on the cluster. We provide equivalence transformations for these boundary conditions that can be used to simplify fault-tolerant circuits and to derive circuit identities in a topological manner. The spatial dimensionality of the scheme can be reduced to two by converting one spatial axis of the cluster into time. The error threshold is 0.75% for each source in an error model with preparation, gate, storage and measurement errors. The operational overhead is poly-logarithmic in the circuit size.
Mechanical properties and fabric of the Punchbowl fault zone, CaliforniaĀ
Chester, Frederick Michael
faults (DP10C) used in the Compression Tests. 88 22 Specimen configuration for Compression Tests. . 89 23 Specimen configuration for Shear Tests, . 92 LIST OF FIGURES (continued) FIGURE PAGE 24 Differential stress versus axial strai n... the motivation for establishing a program of earthquake-risk evaluation and prediction. One approach to earthquake-prediction (mechanistic approach of Higgs, 1 981 ) involves developing a sound understandi ng of the physical processes operative within...
Fault-tolerant quantum computing with color codes
Andrew J. Landahl; Jonas T. Anderson; Patrick R. Rice
We present and analyze protocols for fault-tolerant quantum computing using color codes. We present circuit-level schemes for extracting the error syndrome of these codes fault-tolerantly. We further present an integer-program-based decoding algorithm for identifying the most likely error given the syndrome. We simulated our syndrome extraction and decoding algorithms against three physically-motivated noise models using Monte Carlo methods, and used the simulations to estimate the corresponding accuracy thresholds for fault-tolerant quantum error correction. We also used a self-avoiding walk analysis to lower-bound the accuracy threshold for two of these noise models. We present and analyze two architectures for fault-tolerantly computing with these codes: one with 2D arrays of qubits are stacked atop each other and one in a single 2D substrate. Our analysis demonstrates that color codes perform slightly better than Kitaev's surface codes when circuit details are ignored. When these details are considered, we estimate that color codes achieve a threshold of 0.082(3)%, which is higher than the threshold of $1.3 \\times 10^{-5}$ achieved by concatenated coding schemes restricted to nearest-neighbor gates in two dimensions but lower than the threshold of 0.75% to 1.1% reported for the Kitaev codes subject to the same restrictions. Finally, because the behavior of our decoder's performance for two of the noise models we consider maps onto an order-disorder phase transition in the three-body random-bond Ising model in 2D and the corresponding random-plaquette gauge model in 3D, our results also answer the Nishimori conjecture for these models in the negative: the statistical-mechanical classical spin systems associated to the 4.8.8 color codes are counterintuitively more ordered at positive temperature than at zero temperature.
Fault-Tolerant Thresholds for Encoded Ancillae with Homogeneous Errors
Bryan Eastin
I describe a procedure for calculating thresholds for quantum computation as a function of error model given the availability of ancillae prepared in logical states with independent, identically distributed errors. The thresholds are determined via a simple counting argument performed on a single qubit of an infinitely large CSS code. I give concrete examples of thresholds thus achievable for both Steane and Knill style fault-tolerant implementations and investigate their relation to threshold estimates in the literature.
Minnesota, University of
LaCrescent CityofMorris LincolnCounty RiverRiderPublicTransitSystem ClayCounty Semcac WatonwanCounty Tri-CountyActionProgram,Inc RedLakeBandofChippewaIndians HubbardCounty BeckerCountyTransit Tri-ValleyOpportunityCouncil,Inc. Mille1 #12;2 #12;3 #12;4 #12;5 #12;6 #12;7 #12;8 #12;9 #12;10 County Population Characterist ics Future
Gravity and fault structures, Long Valley caldera, California
Carle, S.F.; Goldstein, N.E.
The main and catastrophic phase of eruption in Long Valley occurred 0.73 m.y. ago with the eruption of over 600 km/sup 3/ of rhyolitic magma. Subsequent collapse of the roof rocks produced a caldera which is now elliptical in shape, 32 km east-west by 17 km north-south. The caldera, like other large Quarternary silicic ash-flow volcanoes that have been studied by various workers, has a nearly coincident Bouguer gravity low. Earlier interpretations of the gravity anomaly have attributed the entire anomaly to lower density rocks filling the collapsed structure. However, on the basis of many additional gravity stations and supporting subsurface data from several new holes, a much more complex and accurate picture has emerged of caldera structure. From a three-dimensional inversion of the residual Bouguer gravity data we can resolve discontinuities that seem to correlate with extensions of pre-caldera faults into the caldera and faults associated with the ring fracture. Some of these faults are believed related to the present-day hydrothermal upflow zone and the zone of youngest volcanic activity within the caldera.
Superconducting fault current-limiter with variable shunt impedance
Llambes, Juan Carlos H; Xiong, Xuming
A superconducting fault current-limiter is provided, including a superconducting element configured to resistively or inductively limit a fault current, and one or more variable-impedance shunts electrically coupled in parallel with the superconducting element. The variable-impedance shunt(s) is configured to present a first impedance during a superconducting state of the superconducting element and a second impedance during a normal resistive state of the superconducting element. The superconducting element transitions from the superconducting state to the normal resistive state responsive to the fault current, and responsive thereto, the variable-impedance shunt(s) transitions from the first to the second impedance. The second impedance of the variable-impedance shunt(s) is a lower impedance than the first impedance, which facilitates current flow through the variable-impedance shunt(s) during a recovery transition of the superconducting element from the normal resistive state to the superconducting state, and thus, facilitates recovery of the superconducting element under load.
Understanding the Hydrologic Characteristics and Absorption Capacity of Bioretention Areas Kathryn Shepard
Arnold, Jonathan
of storm water best management practices. Available at http://cfpub.epa.gov/npdes storm events. REFERENCES Atlanta Regional Commission. 2001. Georgia storm water management manual Building, Room 2401 Historically, stormwater management has focused primarily on flood control
Effect of HVDC line faults on transient torsional torques of turbine-generator shafts
Shi, W. (Xi'an Jiaotong Univ. (China). Dept. of Electrical Engineering); Iravani, M.R. (Univ. of Toronto, Ontario (Canada). Dept. of Electrical Engineering)
This paper investigates the effects of HVdc line faults, line de-energization, and line re-energization on the transient torsional stresses of steam turbine-generator (T-G) units. The studies are conducted on a bipole HVdc system which connects a T-G set to a large ac system. The shaft transient stresses of the T-G set as a result of HVac line fault, fault clearing, and automatic reclosure are also determined when the HVdc transmission system is replaced by an equivalent double-line HVac system. The EMTDC program is used for the simulation studies. The studies conclude that transient shaft stresses as a result of HVdc line fault and its subsequent switching events are (1) significantly less severe than those of HVac faults and subsequent switchings, and (2) not sensitive to the fault location and disturbance duration.
The Nevada railroad system: Physical, operational, and accident characteristics
This report provides a description of the operational and physical characteristics of the Nevada railroad system. To understand the dynamics of the rail system, one must consider the system`s physical characteristics, routing, uses, interactions with other systems, and unique operational characteristics, if any. This report is presented in two parts. The first part is a narrative description of all mainlines and major branchlines of the Nevada railroad system. Each Nevada rail route is described, including the route`s physical characteristics, traffic type and volume, track conditions, and history. The second part of this study provides a more detailed analysis of Nevada railroad accident characteristics than was presented in the Preliminary Nevada Transportation Accident Characterization Study (DOE, 1990).
Fault Characterization using Induced Electric Currents Presumed to Undergo Anomalous Diffusion in Mason, Texas
Murphy, Blaine Cullen
FAULT CHARACTERIZATION USING INDUCED ELECTRIC CURRENTS PRESUMED TO UNDERGO ANOMALOUS DIFFUSION IN MASON, TEXAS A Thesis by BLAINE CULLEN MURPHY Submitted to the Office of Graduate and Professional Studies of Texas A&M University in partial... Blaine Cullen Murphy ABSTRACT A tensorial (9-component) controlled source electromagnetic survey over an oblique slip fault in Mason County, Texas was acquired and the data were analyzed in order to characterize the structure of the fault and observe...
Influence of faults on groundwater flow and transport at YuccaMountain, Nevada
Cohen, Andrew J.B.; Sitar, Nicholas
Numerical simulations of groundwater flow at Yucca Mountain, Nevada are used to investigate how faults influence groundwater flow pathways and regional-scale macrodispersion. The 3-D model has a unique grid block discretization that facilitates the accurate representation of the complex geologic structure present in faulted formations. Each hydrogeologic layer is discretized into a single layer of irregular and dipping grid blocks, and faults are discretized such that they are laterally continuous and varied in displacement varies along strike. In addition, the presence of altered fault zones is explicitly modeled, as appropriate. Simulations show that upward head gradients can be readily explained by the geometry of hydrogeologic layers, the variability of layer permeabilities, and the presence of permeable fault zones or faults with displacement only, not necessarily by upwelling from a deep aquifer. Large-scale macrodispersion results from the vertical and lateral diversion of flow near the contact of high- and low-permeability layers at faults, and from upward flow within high-permeability fault zones. Conversely, large-scale channeling can occur as a result of groundwater flow into areas with minimal fault displacement. Contaminants originating at the water table can flow in a direction significantly different from that of the water table gradient, and isolated zones of contaminants can occur at the water table downgradient. By conducting both 2-D and 3-D simulations, we show that the 2-D cross-sectional models traditionally used to examine flow in faulted formations may not be appropriate. In addition, the influence of a particular type of fault cannot be generalized; depending on the location where contaminants enter the saturated zone, faults may either enhance or inhibit vertical dispersion.
Performance Study of Enhanced Auto-Associative Neural Networks For Sensor Fault Detection
Najafi, M.; Culp, C.; Langari, R.
- INTRODUCTION When sensors malfunction, control systems become unreliable. Even with the most sophisticated instruments and control algorithms, a control decision based on faulty data will likely lead to incorrect control actions. ?Sensor Fault Detection...? is usually considered as a subset of fault detection. One of the well known approaches in Fault Detection is the model based approach in which a computational model is designed to predict the real system output while receiving the same input ([7], [8...
Fault Tolerance Techniques for Wireless Ad Hoc Sensor Networks Farinaz Koushanfar
poten- tial to provide inexpensive and pervasive bridge between physical and computational worlds and actuators that have significantly higher fault rates than the traditional semiconductor integrated circuits
Subsidence as factor in development of listric-faulted rollover anticlines, Gulf of Mexico basin
Padgham, J.B.
Syndepositional subsidence of deltaic clastics into finer grained sediments has long been recognized in the Gulf of Mexico basin. This subsidence influences the size and shape of typical listric-faulted rollover anticlines. Rollovers that form through loading, subsidence, and fault slip involve the compaction of faulted. This reduces the fault dip angle and changes the shape of the faulted limb. However, compaction cannot account for severe reductions in this angle. Based on conceptual models, photographs of a laboratory experiment, and current seismic interpretations, listric faults are depressed and flattened as new sedimentation presses underlying abnormally pressured shales, deforming them through flexure flow into ridges and synclines. Examples include a rollover formed through downthrown loading, and thick Pleistocene rollover limbs extended through massive loading. Through subsidence, fault dip azimuth was reversed in one case; in another, loading uniformly depressed tilted upthrown beds, forming a conveyor that supplied a growing downslope diapir. Synclinal and anticlinal curvature in many rollover limbs apparently results from compaction. Similar curvature was developed in computer models. A conceptual model of a rollover formed as a slump is compared to rollovers offshore Texas. It is suggested that shallow subsidence along the Brazos Ridge fault produced a broad, low-relief anticline, and that subsidence, not deep-seated uplift, flexed crestal beds to produce tension faults.
Coulomb stress accumulation along the San Andreas Fault system Bridget Smith and David Sandwell
Smith-Konter, Bridget
Coulomb stress accumulation along the San Andreas Fault system Bridget Smith and David Sandwell deformation, SCEC velocities, crustal stress Citation: Smith, B., and D. Sandwell, Coulomb stress accumulation
Regional fault pattern study - Sonam/Ajapa area offshore Western Niger Delta
Kanu, K.A.; Glass, J.E.; Okoro, P.C. [Chevron Nigeria Ltd., Lagos (Nigeria)] [and others
A total of 900 km{sup 2} of high quality 3-D data was used to interpret structural trends: an inner trend containing the Mefa, Meji and Ajapa oil fields and a younger outer trend containing the large Sonam condensate field. Each trend is bounded by a large, regional down-to-the-coast fault system on the northeast and its associated counter-regional fault to the southwest. Hydrocarbon accumulations are contained within rollover anticlines adjacent to the main seaward-dipping fault trends. However, our data shows that structural geometries within each trend are highly three-dimensional. Anticlinal end closure is achieved by changes in fault detachment level and displacement which generally occur near major fault junctions. Thus, significant accumulations are associated with first-order high-relief accommodation zones. In the absence of such first-order closure, we cannot rely upon the systems of relatively small faults that occur on seaward dipping flanks and in areas of crestal collapse. Detailed 3-D mapping, supported by drilling results, shows that such faults do not link strongly together, thereby allowing leakage of hydrocarbons mound fault tips and up relay ramps between faults.
Locating an active fault zone in Coso geothermal field by analyzing...
from microearthquake data Jump to: navigation, search OpenEI Reference LibraryAdd to library Conference Proceedings: Locating an active fault zone in Coso geothermal field by...
Fault-Tolerant Resynthesis with Dual-Output LUTs Ju-Yueh Lee1
He, Lei
utilization rate in real designs motivates us to utilize non-occupied SRAM bits of dual-output LUTs for fault
Wind Power Plant Enhancement with a Fault-Current Limiter: Preprint
Muljadi, E.; Gevorgian, V.; DeLaRosa, F.
This paper investigates the capability of a saturable core fault-current limiter to limit the short circuit current of different types of wind turbine generators.
Microsoft Word - GroundFaultSAND-rev7-JJ.doc
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
to describe analytically without transcendental equations, but the use of computer circuit simulations can describe the behavior of a PV system for a wide variety of fault...
HTP in Positive Characteristic HTP in Positive Characteristic
Shlapentokh, Alexandra
HTP in Positive Characteristic HTP in Positive Characteristic Alexandra Shlapentokh East Carolina University October 2007 #12;HTP in Positive Characteristic Table of Contents 1 A Brief History of Diophantine Diophantine Sets, Definitions and Models HTP over a Field vs. HTP over a Subring 3 A Brief History of HTP over
HTP in Positive Characteristic HTP in Positive Characteristic
Shlapentokh, Alexandra
HTP in Positive Characteristic HTP in Positive Characteristic Alexandra Shlapentokh East Carolina University November 2007 #12;HTP in Positive Characteristic Table of Contents 1 A Brief History are Done Diophantine Sets, Definitions and Models HTP over a Field vs. HTP over a Subring 3 A Brief History
Award ER25750: Coordinated Infrastructure for Fault Tolerance Systems Indiana University Final Report
Lumsdaine, Andrew
The main purpose of the Coordinated Infrastructure for Fault Tolerance in Systems initiative has been to conduct research with a goal of providing end-to-end fault tolerance on a systemwide basis for applications and other system software. While fault tolerance has been an integral part of most high-performance computing (HPC) system software developed over the past decade, it has been treated mostly as a collection of isolated stovepipes. Visibility and response to faults has typically been limited to the particular hardware and software subsystems in which they are initially observed. Little fault information is shared across subsystems, allowing little flexibility or control on a system-wide basis, making it practically impossible to provide cohesive end-to-end fault tolerance in support of scientific applications. As an example, consider faults such as communication link failures that can be seen by a network library but are not directly visible to the job scheduler, or consider faults related to node failures that can be detected by system monitoring software but are not inherently visible to the resource manager. If information about such faults could be shared by the network libraries or monitoring software, then other system software, such as a resource manager or job scheduler, could ensure that failed nodes or failed network links were excluded from further job allocations and that further diagnosis could be performed. As a founding member and one of the lead developers of the Open MPI project, our efforts over the course of this project have been focused on making Open MPI more robust to failures by supporting various fault tolerance techniques, and using fault information exchange and coordination between MPI and the HPC system software stack?from the application, numeric libraries, and programming language runtime to other common system components such as jobs schedulers, resource managers, and monitoring tools.
Understanding Educational Reforms: Physics Education Research
Colorado at Boulder, University of
Understanding Educational Reforms: Impacts of Physics Education Research Steven Pollock Physics Science Education Scientifically Theoretical frames Student concepts and engagement Curricular reforms
Memorandum of Understanding, Responsibilities of Federal Agencies...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
to Protect Migratory Birds September 12, 2013 DOE and the Department of the Interior's Fish and Wildlife Service (FWS) have entered into a Memorandum of Understanding (MOU)...
Memorandum of Understanding Regarding Transmission Siting on...
Took Effect Not Provided Legal Citation Not provided DOI Not Provided Check for DOI availability: http:crossref.org Online Internet link for Memorandum of Understanding Regarding...
Memorandum of Understanding Regarding Transmission Siting on...
Took Effect Not Provided Legal Citation Not provided DOI Not Provided Check for DOI availability: http:crossref.org Citation Federal Agencies. . Memorandum of Understanding...
Understanding Manufacturing Energy and Carbon Footprints, October...
Broader source: Energy.gov (indexed) [DOE]
More Documents & Publications Understanding the 2010 Manufacturing Energy and Carbon Footprints U.S. Manufacturing Energy Use and Greenhouse Gas Emissions Analysis Cement...
Project Profile: Helios: Understanding Solar Evolution through...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
Analytics Project Profile: Helios: Understanding Solar Evolution through Text Analytics Logo of SRI International. SRI International, under the Solar Energy Evolution and Diffusion...
Wafer characteristics via reflectometry
Sopori, Bhushan L. (Denver, CO)
Various exemplary methods (800, 900, 1000, 1100) are directed to determining wafer thickness and/or wafer surface characteristics. An exemplary method (900) includes measuring reflectance of a wafer and comparing the measured reflectance to a calculated reflectance or a reflectance stored in a database. Another exemplary method (800) includes positioning a wafer on a reflecting support to extend a reflectance range. An exemplary device (200) has an input (210), analysis modules (222-228) and optionally a database (230). Various exemplary reflectometer chambers (1300, 1400) include radiation sources positioned at a first altitudinal angle (1308, 1408) and at a second altitudinal angle (1312, 1412). An exemplary method includes selecting radiation sources positioned at various altitudinal angles. An exemplary element (1650, 1850) includes a first aperture (1654, 1854) and a second aperture (1658, 1858) that can transmit reflected radiation to a fiber and an imager, respectfully.
Cockade breccia: Product of mineralisation along dilational faults
Frenzel, Max; Woodcock, Nigel H.
ascent velocities on the order of 10-1 to 100 m/s are therefore necessary, if 235 the formation of cockade breccias is to be explained by bed fluidisation or suspension. 236 The critical question is now whether such high flow velocities can be attained... : a) involvement of a highly viscous and dense 204 (drilling fluid-like) fluid agitated by fault movement (shear fluidisation) and b) involvement of a 205 low viscosity fluid at high flow speeds. 206 If indeed highly viscous drilling-fluid like...
Waste Management Fault Tree Data Bank (WM): 1992 status report
Baughman, D.F.; Hang, P.; Townsend, C.S.
The Risk Assessment Methodology Group (RAM) of the Nuclear Process Safety Research Section (NPSR) maintains a compilation of incidents that have occurred in the Waste Management facilities. The Waste Management Fault Tree Data Bank (WM) contains more than 35,000 entries ranging from minor equipment malfunctions to incidents with significant potential for injury or contamination of personnel. This report documents the status of the WM data bank including: availability, training, source of data, search options, and usage, to which these data have been applied. Periodic updates to this memorandum are planned as additional data or applications are acquired.
An expert system for fault detection and diagnosis
Spasojevic, Predrag
to thank Dr. Ali Abur for his help in setting Eb1TP simulations. I would also lilre to thank Charles Fromen and Don Sevcik both with HLtrP Houston for providing invaluable expertise used in this thesis. TABLE OF CONTENTS CHAPTER Page INTRODUCTION . A... IV EXPERT SYSTEM DESIGN . . A. Introduction B. Rochester DFR Conversion C. EMTP Output File Conversion 46 46 47 54 vn1 CHAPTER Page VI D. Signal Analysis: MATI, AB . E. Fault Diagnosis: CLIPS F. Waveform Presentation: MATLAB G...
Fault Current Limiters (FCL) Fact Sheet | Department of Energy
Office of Environmental Management (EM)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742 33 1112011 Strategic Plan| Department of.pdf6-OPAMDepartment6 FY FactWindFault Current Limiters
Apex or Salient of Normal Fault | Open Energy Information
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are beingZealand Jump to:Ezfeedflag JumpID-fTriWildcatAntrim County, Michigan: EnergySalient of Normal Fault Jump to:
Detection and diagnosis of faults and energy monitoring of HVAC systems with least-intrusive power analysis
Luo, Dong, 1966-
Faults indicate degradation or sudden failure of equipment in a system. Widely existing in heating, ventilating, and air conditioning (HVAC) systems, faults always lead to inefficient energy consumption, undesirable indoor ...
Fault Current Calculation by The Least Squares Method Natthaphob Nimpitiwan, Student Member, IEEE, and Gerald T. Heydt, Fellow, IEEE
OF FAULT CURRENT Circuit breaker capability and configuration of protective relays that were previously relays, and their coordination. Systems must be able to withstand a certain limit of faults which also
Abstract-This paper investigates four different short circuit fault conditions which can occur for an inverter-fed perma-
Jantsch, Axel
for an inverter-fed perma- nent magnet synchronous motor (PMSM) with buried mag- nets. The fault conditions Condition #... Inverter PM machine (at steady state) N Short circuit fault conditions of a buried PMSM
A 2D Pseudodynamic Rupture Model Generator for Earthquakes on Geometrically Complex Faults
Dunham, Eric M.
A 2D Pseudodynamic Rupture Model Generator for Earthquakes on Geometrically Complex Faults complexity in the rupture process and resulting ground motion. We present a 2D kinematic rupture generator that emulates the strong dependence of earthquake source parameters on local fault geometry observed in dynamic
Establishment of the mathematical model for diagnosing the engine valve faults by genetic
Fernandez, Thomas
in a six- cylinders/four-stroke cycle diesel engine, i.e. normal condition, valve-tappet clearance and gas for diagnosing the faults occurring in rotor-bearing system, but current computer programs cannot easily distinguish the orbit shapes automatically. Likewise, when diagnosing the faults in a rolling-element bearing
Fault Detection Methodology for Caches in Reliable Modern VLSI Microprocessors based on Instruction Set
Kouroupetroglou, Georgios
, Professor #12;hardware defects that may occur during system operation by the increased soft error rateFault Detection Methodology for Caches in Reliable Modern VLSI Microprocessors based on Instruction-Based Self-Test (SBST) fault detection methodology for small embedded cache memories. The methodology
The FREEDM Architecture of Fault Tolerant Network Routing through Software Overlays
Mueller, Frank
) and Intelligent Fault Management devices have the appropri- ate data to make control decisions for microgridsThe FREEDM Architecture of Fault Tolerant Network Routing through Software Overlays Christopher firstname.lastname@example.com Abstract Control decisions of intelligent devices in critical infrastructure can have
Message-Efficient Byzantine Fault-Tolerant Broadcast in a Multi-Hop Wireless Sensor Network
Paris-Sud XI, Universitķ de
Message-Efficient Byzantine Fault-Tolerant Broadcast in a Multi-Hop Wireless Sensor Network Marin-marie.kermarrec, email@example.com Abstract We consider message-efficient broadcast tolerating Byzantine faults in a multi, and a single neighborhood contains at most t dishonest and collision-capable (bad) nodes, each with a message
Morphology, displacement, and slip rates along the North Anatolian Fault, Turkey
Hubert-Ferrari, Aur├®lia
Morphology, displacement, and slip rates along the North Anatolian Fault, Turkey Aure┬┤lia Hubert, Ayazaga, Istanbul, Turkey Received 29 January 2001; revised 8 January 2002; accepted 13 January 2002 the central and eastern North Anatolian Fault (NAF) in Turkey. The NAF total displacement is reevaluated using
Decentralized Fault Detection and Isolation in Wireless Structural Health Monitoring Systems using Analytical Redundancy
Stanford University
1/43 Decentralized Fault Detection and Isolation in Wireless Structural Health Monitoring Systems when deploying wireless sensor networks for long-term structural health monitoring (SHM) is the correct Fault detection and isolation, structural health monitoring, wireless sensing, smart structures
Oil and Gas CDT Predicting fault permeability at depth: incorporating natural
Henderson, Gideon
Oil and Gas CDT Predicting fault permeability at depth: incorporating natural permeability controls on fluid flow in oil and gas reservoirs. Fault zones are composed of many deformation elements will receive 20 weeks bespoke, residential training of broad relevance to the oil and gas industry: 10 weeks
Paris-Sud XI, Universitķ de
RELIABILITY ANALYSIS IN A FAULT TOLERANT CONTROL STRATEGY DEDICATED TO ACTIVE POWER FILTER P. WEBER reliability indicate the optimal structure. Keywords: Fault Tolerant Control, System Reliability, Active power control and nuclear power plant operation (Zhang and Jiang, 2003). Various studies on FTC are based
A Reconfigurable Motor for Experimental Emulation of Stator Winding Inter-Turn and Broken Bar Faults
Povinelli, Richard J.
A Reconfigurable Motor for Experimental Emulation of Stator Winding Inter-Turn and Broken Bar emulation of stator winding inter-turn and broken rotor bar faults, are presented in this paper such as stator windings or rotor bars when acquiring data from a knWi dinL lar Bearit faulty machine for fault
Detecting Intrusion Faults in Remotely Controlled Systems Salvatore Candido and Seth Hutchinson
Hutchinson, Seth
the design process. With this in mind, researchers have begun to address security issues specific to controlDetecting Intrusion Faults in Remotely Controlled Systems Salvatore Candido and Seth Hutchinson to a remote-controlled system (deemed an "intrusion fault" or "intrusion") despite attempts to conceal
Comparative analysis of electrical and mechanical fault signatures in induction motorsĀ
Venugopal, Arvind Madabushi
. . . . . . . . . . . . . . . . . . 83 3. Two Broken Rotor Bars . . . . . . . . . . . . . . . . . 88 4. Four Broken Rotor Bars . . . . . . . . . . . . . . . . . 103 C. Fault III: Air-Gap Eccentricity . . . . . . . . . . . . . . . . 114 1. Air-Gap Eccentricity - Case 1... . . . . . . . . . . . . . . 114 2. Air-Gap Eccentricity - Case 2 . . . . . . . . . . . . . . 125 D. Fault IV: Mechanical Imbalance . . . . . . . . . . . . . . . 136 E. Summary of the Comparison Based on the Load Levels . . 147 F. Summary of the Comparison Based on Motor Ratings...
Journal of Power Sources 165 (2007) 267278 A Bayesian network fault diagnostic system for proton
Sim§es, Marcelo Godoy
exchange membrane fuel cells Luis Alberto M. Riascosa,, Marcelo G. Simoesb, Paulo E. Miyagic a Federal considers the effects of different types of faults on a proton exchange membrane fuel cell model (PEMFC. ® 2006 Elsevier B.V. All rights reserved. Keywords: Bayesian networks; Fault diagnosis; Fuel cells 1
A Novel Wavelet Transform Based Transient Current Analysis for Fault Detectionand Localization *
Bhunia, Swarup
25.2 A Novel Wavelet Transform Based Transient Current Analysis for Fault Detectionand Localization. In this paper, we present a novel integrated method for fault detection and localization using wavelet transform based IDD waveform analysis. The time-frequency resolu- tion property of wavelet transform helps us
Modeling and Analysis of Safety-Critical Cyber Physical Systems using State/Event Fault Trees
Paris-Sud XI, Universitķ de
. Keywords: reliability modeling, risk analysis, attack trees, fault tree, State/Event Fault Tree 1 to their ability to capture qualitative and quantitative analysis aspects they can be seen as state of the art and it is not possible to do a quantitative analysis of them in case of statistical depend basic events. In [6] Kaiser et
Robust Codes for Fault Attack Resistant Cryptographic Konrad J. Kulikowski, Mark G. Karpovsky, Alexander Taubin
Karpovsky, Mark
Robust Codes for Fault Attack Resistant Cryptographic Hardware Konrad J. Kulikowski, Mark G algorithms are vulner- able to fault analysis attacks. To detect these attacks we propose an architec- ture by an attacker. Architectures based on these codes have fewer undetectable er- rors than linear codes
Shallow seismic reflection profile of the Meers fault, Comanche County, Oklahoma
Myers, Paul B.; Miller, Richard D.; Steeples, Don W.
.J., The Meers fault tectonic activity in south- western Oklahoma, U. S. Nuclear Regulatory Commission, NUREG ICR-4852, 1-25, A1-A25, 1987. McLean, R., and Stearns, D.W., Fault analysis in the Wichita Mountains [Abs. ], AAPG Bull. 67, 511-512, 1983. Miller...
An empirical study of faults in late propagation clone genealogies Liliane Barbour1
Zou, Ying
An empirical study of faults in late propagation clone genealogies Liliane Barbour1 , Foutse Khomh2 has an effect on the fault proneness of specific types of late propagation genealogies. Lastly, we can February 2012; Revised 21 January 2013; Accepted 15 March 2013 KEY WORDS: clone genealogies; late
An Empirical Study on the Fault-Proneness of Clone Migration in Clone Genealogies
Zou, Ying
An Empirical Study on the Fault-Proneness of Clone Migration in Clone Genealogies Shuai Xie1 genealogy. During the evolution of a clone group, developers may change the location of the code fragments the risk for faults in clone segments, clone groups, and clone genealogies from three long-lived software
On-line Fault Detection and Location for NoC Interconnects Cristian Grecu1
Pande, Partha Pratim
On-line Fault Detection and Location for NoC Interconnects Cristian Grecu1 , Andr├® Ivanov1 , Res-line fault detection and location in Network-on-chip (NoC) communication fabrics is introduced. This approachC-based chips. These factors motivated us to develop a method for concurrent error detection and location for No
Algorithms for Green Buildings: Learning-Based Techniques for Energy Prediction and Fault Diagnosis
Seshia, Sanjit A.
Algorithms for Green Buildings: Learning-Based Techniques for Energy Prediction and Fault Diagnosis on servers or to redistribute to lists, requires prior specific permission. #12;Algorithms for Green Buildings: Learning-Based Techniques for Energy Prediction and Fault Diagnosis Daniel Holcomb Wenchao Li
Treanmission Line Fault Location using Interoperability and Integration of Data and Model
Dutta, Papiya
. The second type is a sparse measurement based fault location scheme using phasor measurements from different substations located in the vicinity where the fault has occurred and can be applied if the measurements are not available from any of the line ends...
SEIF: Secure and Efficient Intrusion-Fault tolerant routing protocol for wireless sensor networks
Paris-Sud XI, Universitķ de
1 SEIF: Secure and Efficient Intrusion-Fault tolerant routing protocol for wireless sensor networks Informatique Algiers, Algeria Email: firstname.lastname@example.com Abstract--In wireless sensor networks, reliability network, Security, Intrusion tolerance, Fault tolerance, Secure routing. I. INTRODUCTION Wireless Sensor
System for detecting and limiting electrical ground faults within electrical devices
Gaubatz, Donald C. (Cupertino, CA)
An electrical ground fault detection and limitation system for employment with a nuclear reactor utilizing a liquid metal coolant. Elongate electromagnetic pumps submerged within the liquid metal coolant and electrical support equipment experiencing an insulation breakdown occasion the development of electrical ground fault current. Without some form of detection and control, these currents may build to damaging power levels to expose the pump drive components to liquid metal coolant such as sodium with resultant undesirable secondary effects. Such electrical ground fault currents are detected and controlled through the employment of an isolated power input to the pumps and with the use of a ground fault control conductor providing a direct return path from the affected components to the power source. By incorporating a resistance arrangement with the ground fault control conductor, the amount of fault current permitted to flow may be regulated to the extent that the reactor may remain in operation until maintenance may be performed, notwithstanding the existence of the fault. Monitors such as synchronous demodulators may be employed to identify and evaluate fault currents for each phase of a polyphase power, and control input to the submerged pump and associated support equipment.
Methodology for designing the fuzzy resolver for a radial distribution system fault locator
Li, Jun
The Power System Automation Lab at Texas A&M University developed a fault location scheme that can be used for radial distribution systems. When a fault occurs, the scheme executes three stages. In the first stage, all data measurements and system...
Fault Injection Based Assessment of Fail-Silence Provided by Process Duplication versus Internal Error Detection
Newcastle upon Tyne, University of
-basedarchitectures for providingfail-silent processes, Voltan and Chameleon ARMORs, are analyzed using fault injection. The goal with an ideal case of full duplication provided by Voltan. Rather than providing fault tolerance through redundant customized hardware, Voltan and Chameleon take the alternate approach of providing fail
XVII JORNADAS DE PARALELISMO--ALBACETE, SEPTIEMBRE 2006 1 A fault tolerant coherence protocol for CMP
Fernßndez Pascual, Ricardo
to be designed, several fault tolerant techniques must be used. Moreover, the reliability of electronic components is never perfect. Electronic components are subject to several types of failures due to a number to design new techniques to deal with these faults to be able to build sufficiently reliable Chip
A Smart Algorithm for the Diagnosis of Short-Circuit Faults in a Photovoltaic Generator
Paris-Sud XI, Universit├® de
A Smart Algorithm for the Diagnosis of Short-Circuit Faults in a Photovoltaic Generator Wail Rezgui observations distributed over classes is used for simulation purposes. Keywords--Photovoltaic generator, SVM, k-NN, short-circuit fault, smart classification, linear programming. NOMENCLATURE PV = Photovoltaic; SVM
A Regression Algorithm for the Smart Prognosis of a Reversed Polarity Fault in a Photovoltaic Generator
Paris-Sud XI, Universit├® de
A Regression Algorithm for the Smart Prognosis of a Reversed Polarity Fault in a Photovoltaic database containing sample data is used for simulation purposes. Keywords--Photovoltaic generator, SVR, k-NNR, reversed polarity fault, diagnosis, prognosis. NOMENCLATURE PV = Photovoltaic; SVM = Support Vector
A Probability Extension of PCA to Detect and Diagnose Sensor Faults in Air Handling Units
Li, Z.
Due to sensor faults, it is a challenge to successfully detect and diagnose component faults in HVAC systems. The Principal Component Analysis (PCA) method has become a popular method to tackle this problem in recent years, but PCA is not capable...
Electromagnetic detection of plate hydration due to bending faults at the Middle America Trench
Constable, Steve
images show that the extensive network of trench parallel normal faults penetrates the entire oceanic bending faults on the incoming oceanic plate of the Middle America Trench offshore Nicaragua have been observed to penetrate to mantle depths, suggesting a permeable pathway for hydration of the crust
Fault detection and isolation in aircraft gas turbine engines. Part 1: underlying concept
Ray, Asok
307 Fault detection and isolation in aircraft gas turbine engines. Part 1: underlying concept: aircraft propulsion, gas turbine engines, fault detection and isolation, statistical pattern recognition 1 INTRODUCTION Performance and reliability of aircraft gas turbine engines gradually deteriorate over the service
Christiaan J.J. Paredis and Pradeep K. Khosla, ``Designing Fault Tolerant Manipulators: How Many Degreesoffreedom?''
Degrees┬Łof┬Łfreedom?'' to appear in The International Journal of Robotics Research, 1996. Designing Fault design templates for spatial fault tolerant manipulators. In a second approach, both the Cartesian task in their robot designs (Wu et al. 1993). Reliability is also #12; 2 Christiaan J.J. Paredis and Pradeep K. Khosla
Action Models: A Reliability Modeling Formalism for Fault-Tolerant Distributed Computing Systems
Newcastle upon Tyne, University of
Action Models: A Reliability Modeling Formalism for Fault-Tolerant Distributed Computing Systems. Introduction Model-based evaluation of the reliability of distributed systems has traditionally required expert- proach to analyze the reliability of fault-tolerant distributed systems. More in particular, we want
Tertiary strike-slip faulting in southeastern Mongolia and implications for Asian tectonics
Johnson, Cari
Tertiary strike-slip faulting in southeastern Mongolia and implications for Asian tectonics L Geologic maps have long portrayed the Late CretaceousŁRecent geologic history of southeastern Mongolia of the East Gobi basin in southeastern Mongolia (Figs. 1 and 2). This corridor, the East Gobi Fault Zone (EGFZ
Can Fault Prediction Models and Metrics be Used for Vulnerability Prediction? Yonghee Shin and Laurie Williams
Young, R. Michael
Can Fault Prediction Models and Metrics be Used for Vulnerability Prediction? Yonghee Shin to prioritize security inspection and testing efforts may be better served by a prediction model that indicates commonalities that may allow development teams to use traditional fault prediction models and metrics
DFIG Driven Wind Turbine Grid Fault-Tolerance Using High-Order Sliding Mode Control
Boyer, Edmond
DFIG Driven Wind Turbine Grid Fault-Tolerance Using High-Order Sliding Mode Control Mohamed fault-tolerance of a doubly-fed induction generator- based wind turbine using high-order sliding mode mechanical stress on the drive train). Simulations using the NREL FAST code on a 1.5-MW wind turbine
Influence of Transcontinental arch on Cretaceous listric-normal faulting, west flank, Denver basin
Davis, T.L.
Seismic studies along the west flank of the Denver basin near Boulder and Greeley, Colorado illustrate the interrelationship between shallow listric-normal faulting in the Cretaceous and deeper basement-controlled faulting. Deeper fault systems, primarily associated with the Transcontinental arch, control the styles and causative mechanisms of listric-normal faulting that developed in the Cretaceous. Three major stratigraphic levels of listric-normal faulting occur in the Boulder-Greeley area. These tectonic sensitive intervals are present in the following Cretaceous formations: Laramie-Fox Hills-upper Pierre, middle Pierre Hygiene zone, and the Niobrara-Carlile-Greenhorn. Documentation of the listric-normal fault style reveals a Wattenberg high, a horst block or positive feature of the greater Transcontinental arch, was active in the east Boulder-Greeley area during Cretaceous time. Paleotectonic events associated with the Wattenberg high are traced through analysis of the listric-normal fault systems that occur in the area. These styles are important to recognize because of their stratigraphic and structural influence on Cretaceous petroleum reservoir systems in the Denver basin. Similar styles of listric-normal faulting occur in the Cretaceous in many Rocky Mountain foreland basins.
Characterization of the structure of faults in the Eocene Carrizo Formation near Gause, Milam County, Texas
Yilmaz, Ramazan
This study characterizes the structure and evolution of a series of excellently exposed, normal faults in a small quarry in the Eocene Carrizo Formation near the town of Gause, Milam County, Texas. The faults strike NE-SW and comprise a small...
Fault Evolution in Photovoltaic Array During Night-to-Day Transition
Lehman, Brad
amount of energy loss. For example, in UK domestic PV systems, the annual energy loss due to faults in PV Fault detection and protection in solar photovoltaic (PV) arrays are important tasks for improving PV at night when there is no solar irradiance. During sunrise, the irradiance on the PV array increases slowly
The 2010 Haiti earthquake: A complex fault pattern constrained by seismologic and tectonic observations
Brest, Universitķ de
The 2010 Haiti earthquake: A complex fault pattern constrained by seismologic and tectonic. [1] After the January 12, 2010, Haiti earthquake, we deployed a mainly offshore temporary network), The 2010 Haiti earthquake: A complex fault pattern constrained by seismologic and tectonic observations
Off-fault plasticity and earthquake rupture dynamics: 2. Effects of fluid saturation
Off-fault plasticity and earthquake rupture dynamics: 2. Effects of fluid saturation Robert C slip-weakening behavior is specified, and the off-fault material is described using an elastic-plastic poroelastoplastic materials with and without plastic dilation. During nondilatant undrained response near
Miocene faulting at plate tectonic velocity in the Himalaya of central Nepal
Miocene faulting at plate tectonic velocity in the Himalaya of central Nepal Matthew J. Kohna, Tri-Chandra Campus, Ghantaghar, Kathmandu, Nepal, United States Received 7 April 2004; received (MCT) and affiliated faults in central Nepal. Inferred rates were 1.5F0.9 cm/yr (Langtang Thrust, ~19
Hydrogeological aspects of fault zones on various scales in the Roer Valley Rift System
Bense, Victor
within fault zones has important implications for the modeling of groundwater flow in sedimentary aquifer; Groundwater flow; Unconsolidated sediments; The Netherlands 1. Introduction Numerous studies carried out, 1081 HV Amsterdam, The Netherlands Abstract The impact of faults on the groundwater flow system
REPLICATION AND FAULT-TOLERANCE IN THE ISIS SYSTEM t Kenneth P. Birman
Newhall, Tia
REPLICATION AND FAULT-TOLERANCE IN THE ISIS SYSTEM t Kenneth P. Birman Department of Computer Science Cornell University, Ithaca, New York ABSTRACT The ISIS system transforms abstract type. The performance of distributed fault-tolerant services runnin8 on this initial version of ISIS is found
Real-time fault detection and isolation in biological wastewater treatment plants
Real-time fault detection and isolation in biological wastewater treatment plants F. Baggiani and email@example.com Automatic fault detection is becoming increasingly important in wastewater treatment plant operation, given automation controllers, wastewater treatment INTRODUCTION Real-time monitoring is an increasingly important
Fault-Aware Flow Control and Multi-path Routing in Wireless Sensor Networks
Wu, Jie
Tong University, Shanghai, P. R. China College of Electronic and Electrical Engineering, Shanghai University, Pembroke, U.S.A. ČSchool of Computer Science, Colorado Technical University, Colorado Spring, CO, U of faults, and develop a leaky-path model. This model takes account of packet loss along fault
An On-line Method for Stator Fault Detection in Multi-phase PMSM Drives
Paris-Sud XI, Universit├® de
An On-line Method for Stator Fault Detection in Multi-phase PMSM Drives Fabien Meinguet*, Eric deals with an on-line fault detection method for multi-phase PMSM drives. The method is based an original method for detecting an abnormal asymmetrical behavior in five-phase PMSM drives and we apply
Bayesian network for the characterization of faults in a multivariate process
Paris-Sud XI, Universitķ de
Bayesian network for the characterization of faults in a multivariate process Sylvain VERRON of multivariate processes, we propose an original network structure allowing deciding if a fault is appeared in the process. More, this structure permits the identification of the variables that are responsible (root
Prasad, Sanjiva
MEMORANDUM OF UNDERSTANDING BETWEEN INDIAN INSTITUTE OF TECHNOLOGY AND BHEL REGARDING THE `THERMAL POWER PLANT ENGINEERING CHAIR' This Memorandum of Understanding (MoU) made on 25th day of august 1986 between Indian Institute of Technology, New Delhi (IITD) and M/s Bharat Heavy Electricals Limited, 18
Understanding Regional Economic Growth in India
Understanding Regional Economic Growth in India Jeffrey D. Sachs, Nirupam Bajpai and Ananthi Ramiah Papers #12;Understanding Regional Economic Growth in India Jeffrey D. Sachs Center for International Development (CID) Harvard University email@example.com This paper was prepared for the Asian Economic
Understanding complexity in the human brain
Gazzaniga, Michael
Understanding complexity in the human brain Danielle S. Bassett1 and Michael S. Gazzaniga2 1 the ultimate aim of neuroscientific enquiry is to gain an understanding of the brain and how its work- ings of mindŁbrain mechanisms if the cumulative findings from these neu- roscientific studies are coupled
Understanding the carbon and greenhouse gas balance
Understanding the carbon and greenhouse gas balance of forests in Britain Research Report #12;#12;Research Report Understanding the carbon and greenhouse gas balance of forests in Britain Forestry forest soil survey 29 3.5.2 Carbon storage in the main British forest soil types 30 3.5.3 Changes in soil
Distinguished Lecturer Series Understanding Climate Change
California at Davis, University of
Distinguished Lecturer Series Understanding Climate Change: Opportunities and Challenges for Data A Climate change is the defining environmental challenge facing our planet, yet there is considerable.Anew and transformative approach is required to understand the potential impact of climate change. Data driven approaches
Prasad, Sanjiva
MEMORANDUM OF UNDERSTANDING between MR. SULAIMAN MUTAWA and INDIAN INSTITUTE OF TECHNOLOG DELHI for creation of SULAIMAN MUTAWA Chair Professorship This memorandum of understanding (MoU) between Mr. Sulaiman Delhi. Objectives: The establishment of the Fellowships is expected to: 1. promote excellence
SHORT REVIEW Ecological genomics: understanding gene and
Kaufman, Glennis A.
SHORT REVIEW Ecological genomics: understanding gene and genome function in the natural environment MC Ungerer, LC Johnson and MA Herman Division of Biology, Ecological Genomics Institute, Kansas State University, Manhattan, KS, USA The field of ecological genomics seeks to understand the genetic mechanisms
Understanding the Effects of Marine Biodiversity
Stachowicz, Jay
and negative effects on herbivores. Recognizing that marine and terrestrial approaches to understandingUnderstanding the Effects of Marine Biodiversity on Communities and Ecosystems John J. Stachowicz,1 There is growing interest in the effects of changing marine biodi- versity on a variety of community properties
What We Do Understand of Colour Confinement
A. Di Giacomo; B. Lucini
The status of our understanding of confinement is reviewed. The evidence from lattice is that monopole condensation, or dual superconductivity, is at work. Confinement is an order-disorder transition. Different monopole species look equivalent, indicating that the symmetry of the disordered phase is more interesting that we understand.
Managing Technical Risk: Understanding Private Sector
action. Our study seeks to inform the decisions of both government managers and private entrepreneursApril 2000 Managing Technical Risk: Understanding Private Sector Decision Making on Early Stage 00-787 Managing Technical Risk Understanding Private Sector Decision Making on Early Stage Technology
Understanding Multi-Transputer Execution Susan Stepney
Stepney, Susan
of the execution of occam (2) programs. But even the static structure of an occam program is considerably more of the communication. Folds are used to control the amount of information being displayed. Once the static structure and understanding of occam programs. PAR router(...) mixer(...) worker(...) Susan Stepney. "Understanding Multi
Identification of critical stacking faults in thin-film CdTe solar cells
Yoo, Su-Hyun; Walsh, Aron, E-mail: firstname.lastname@example.com [Global E3 Institute, Department of Materials Science and Engineering, Yonsei University, Seoul 120-749 (Korea, Republic of); Centre for Sustainable Chemical Technologies and Department of Chemistry, University of Bath, Bath BA2 7AY (United Kingdom); Butler, Keith T. [Centre for Sustainable Chemical Technologies and Department of Chemistry, University of Bath, Bath BA2 7AY (United Kingdom); Soon, Aloysius [Global E3 Institute, Department of Materials Science and Engineering, Yonsei University, Seoul 120-749 (Korea, Republic of); Abbas, Ali; Walls, John M., E-mail: firstname.lastname@example.com [Centre for Renewable Energy Systems Technology, School of Electronic, Electrical and Systems Engineering, Loughborough University, Leicestershire LE11 3TU (United Kingdom)
Cadmium telluride (CdTe) is a p-type semiconductor used in thin-film solar cells. To achieve high light-to-electricity conversion, annealing in the presence of CdCl{sub 2} is essential, but the underlying mechanism is still under debate. Recent evidence suggests that a reduction in the high density of stacking faults in the CdTe grains is a key process that occurs during the chemical treatment. A range of stacking faults, including intrinsic, extrinsic, and twin boundary, are computationally investigated to identify the extended defects that limit performance. The low-energy faults are found to be electrically benign, while a number of higher energy faults, consistent with atomic-resolution micrographs, are predicted to be hole traps with fluctuations in the local electrostatic potential. It is expected that stacking faults will also be important for other thin-film photovoltaic technologies.
System and method for bearing fault detection using stator current noise cancellation
Zhou, Wei (Los Angeles, CA); Lu, Bin (Kenosha, WI); Habetler, Thomas G. (Snellville, GA); Harley, Ronald G. (Lawrenceville, GA); Theisen, Peter J. (West Bend, WI)
A system and method for detecting incipient mechanical motor faults by way of current noise cancellation is disclosed. The system includes a controller configured to detect indicia of incipient mechanical motor faults. The controller further includes a processor programmed to receive a baseline set of current data from an operating motor and define a noise component in the baseline set of current data. The processor is also programmed to repeatedly receive real-time operating current data from the operating motor and remove the noise component from the operating current data in real-time to isolate any fault components present in the operating current data. The processor is then programmed to generate a fault index for the operating current data based on any isolated fault components.
System and method for motor fault detection using stator current noise cancellation
Zhou, Wei (Los Angeles, CA); Lu, Bin (Kenosha, WI); Nowak, Michael P. (Menomonee Falls, WI); Dimino, Steven A. (Wauwatosa, WI)
A system and method for detecting incipient mechanical motor faults by way of current noise cancellation is disclosed. The system includes a controller configured to detect indicia of incipient mechanical motor faults. The controller further includes a processor programmed to receive a baseline set of current data from an operating motor and define a noise component in the baseline set of current data. The processor is also programmed to acquire at least on additional set of real-time operating current data from the motor during operation, redefine the noise component present in each additional set of real-time operating current data, and remove the noise component from the operating current data in real-time to isolate any fault components present in the operating current data. The processor is then programmed to generate a fault index for the operating current data based on any isolated fault components.
Unconventional modelling of faulted reservoirs: a case study
Goldthorpe, W.H.; Chow, Y.S.
An example is presented of detailed unconventional gridding of the North Rankin Field, which is a large, structurally complex gas-condensate field offshore Western Australia. A non-Cartesian areal grid was used with corner point geometry to approximate a generalized curvilinear coordinate system for the surface and interior of each reservoir unit. Coordinate lines in the vertical plane at any node in the grid were tilted where necessary to define sloping edges and sides of grid blocks. Thus, any sloping twisted surface could be modelled. To investigate possible communication across faults between different geological units, transmissibilities at faults were automatically calculated for any over-lapping cells and sensitivities made of the effect of varying these transmissibilities on well production, recovery factors, pressure decline and water encroachment. The model was solved with a fully implicit simulator using a Newton-Raphson iteration method for the non-linear equations and a variant of the Conjugate Gradient procedure with a preconditioning matrix for the linear equations.
Fault current limiter and alternating current circuit breaker
Boenig, H.J.
A solid-state circuit breaker and current limiter are disclosed for a load served by an alternating current source having a source impedance, the solid-state circuit breaker and current limiter comprising a thyristor bridge interposed between the alternating current source and the load, the thyristor bridge having four thyristor legs and four nodes, with a first node connected to the alternating current source, and a second node connected to the load. A coil is connected from a third node to a fourth node, the coil having an impedance of a value calculated to limit the current flowing therethrough to a predetermined value. Control means are connected to the thyristor legs for limiting the alternating current flow to the load under fault conditions to a predetermined level, and for gating the thyristor bridge under fault conditions to quickly reduce alternating current flowing therethrough to zero and thereafter to maintain the thyristor bridge in an electrically open condition preventing the alternating current from flowing therethrough for a predetermined period of time. 9 figs.
Restoration and testing of an HTS fault current controller
Waynert, J. A. (Joseph A.); Boenig, H. (Heinrich E.); Mielke, C. H. (Charles H.); Willis, J. O. (Jeffrey O.); Burley, B. L. (Burt L.)
A three-phase, 1200 A, 12.5 kV fault current controller using three HTS 4 mH coils, was built by industry and tested in 1999 at the Center Substation of Southern California Edison in Norwalk, CA. During the testing, it appeared that each of the three single-phase units had experienced a voltage breakdown, one externally and two internally. Los Alamos National Laboratory (LANL) was asked by DOE to restore the operation of the fault current controller provided the HTS coils had not been damaged during the initial substation tests. When the internally-failed coil vacuum vessels were opened it became evident that in these two vessels, a flashover had occurred at the high voltage bus section leading to the terminals of the superconducting coil. An investigation into the failure mechanism resulted in six possible causes for the flashover. Based on these causes, the high voltage bus was completely redesigned. Single-phase tests were successfully performed on the modified unit at a 13.7 kV LANL substation. This paper presents the postulated voltage flashover failure mechanisms, the new high voltage bus design which mitigates the failure mechanisms, the sequence of tests used to validate the new design, and finally, the results of variable load and short-circuit tests with the single-phase unit operating on the LANL 13.7 kV substation.
Fault-tolerant Holonomic Quantum Computation in Surface Codes
Yi-Cong Zheng; Todd A. Brun
We show that universal holonomic quantum computation (HQC) can be achieved fault-tolerantly by adiabatically deforming the gapped stabilizer Hamiltonian of the surface code, where quantum information is encoded in the degenerate ground space of the system Hamiltonian. We explicitly propose procedures to perform each logical operation, including logical state initialization, logical state measurement, logical CNOT, state injection and distillation,etc. In particular, adiabatic braiding of different types of holes on the surface leads to a topologically protected, non-Abelian geometric logical CNOT. Throughout the computation, quantum information is protected from both small perturbations and low weight thermal excitations by a constant energy gap, and is independent of the system size. Also the Hamiltonian terms have weight at most four during the whole process. The effect of thermal error propagation is considered during the adiabatic code deformation. With the help of active error correction, this scheme is fault-tolerant, in the sense that the computation time can be arbitrarily long for large enough lattice size. It is shown that the frequency of error correction and the physical resources needed can be greatly reduced by the constant energy gap.
Increasing fault resiliency in a message-passing environment.
Stearley, Jon R.; Riesen, Rolf E.; Laros, James H., III; Ferreira, Kurt Brian; Pedretti, Kevin Thomas Tauke; Oldfield, Ron A.; Kordenbrock, Todd (Hewlett-Packard Company); Brightwell, Ronald Brian
Petaflops systems will have tens to hundreds of thousands of compute nodes which increases the likelihood of faults. Applications use checkpoint/restart to recover from these faults, but even under ideal conditions, applications running on more than 30,000 nodes will likely spend more than half of their total run time saving checkpoints, restarting, and redoing work that was lost. We created a library that performs redundant computations on additional nodes allocated to the application. An active node and its redundant partner form a node bundle which will only fail, and cause an application restart, when both nodes in the bundle fail. The goal of this library is to learn whether this can be done entirely at the user level, what requirements this library places on a Reliability, Availability, and Serviceability (RAS) system, and what its impact on performance and run time is. We find that our redundant MPI layer library imposes a relatively modest performance penalty for applications, but that it greatly reduces the number of applications interrupts. This reduction in interrupts leads to huge savings in restart and rework time. For large-scale applications the savings compensate for the performance loss and the additional nodes required for redundant computations.
Mobility and coalescence of stacking fault tetrahedra in Cu
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
MartĒnez, Enrique; Uberuaga, Blas P.
Stacking fault tetrahedra (SFTs) are ubiquitous defects in face-centered cubic metals. They are produced during cold work plastic deformation, quenching experiments or under irradiation. From a dislocation point of view, the SFTs are comprised of a set of stair-rod dislocations at the (110) edges of a tetrahedron bounding triangular stacking faults. These defects are extremely stable, increasing their energetic stability as they grow in size. At the sizes visible within transmission electron microscope they appear nearly immobile. Contrary to common belief, we show in this report, using a combination of molecular dynamics and temperature accelerated dynamics, how small SFTs canmoreĀ╗diffuse by temporarily disrupting their structure through activated thermal events. More over, we demonstrate that the diffusivity of defective SFTs is several orders of magnitude higher than perfect SFTs, and can be even higher than isolated vacancies. Finally, we show how SFTs can coalesce, forming a larger defect in what is a new mechanism for the growth of these omnipresent defects.½Āless
Interseismic deformation and creep along the central section of the North Anatolian Fault (Turkey): InSAR observations
Fialko, Yuri
Interseismic deformation and creep along the central section of the North Anatolian Fault (Turkey the central section of the North Anatolian Fault (NAF) in Turkey using interferometric synthetic aperture along the central section of the North Anatolian Fault (Turkey): InSAR observations and implications
Interseismic deformation and creep along the central section of the North Anatolian Fault (Turkey): InSAR observations
Sandwell, David T.
Interseismic deformation and creep along the central section of the North Anatolian Fault (Turkey Anatolian Fault (NAF) in Turkey using interferometric synthetic aperture radar data from the Advanced Land Anatolian Fault (Turkey): InSAR observations and implications for rate-and-state friction properties, J
Sensor Fault-Tolerant Control of an Induction Motor Based Electric Vehicle Bekhera Tabbache1,2
Paris-Sud XI, Universitķ de
Sensor Fault-Tolerant Control of an Induction Motor Based Electric Vehicle Bekhe'ra Tabbache1://www.lbms.fr Keywords Electric Vehicle (EV), Induction motor, Sensor fault, Fault-tolerant control (FTC), Direct torque a reconfigurable direct torque control of an induction motor-based electric vehicle. The proposed strategy concerns