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We are looking for a Quality Assurance Analyst in one of the world's leading energy companies with more than a 100,000 employees and contractors located in over 50 countries around the world. Their large, in-house IT organization consists of 6,000 professionals supporting an array of business lines, plants, refineries, manufacturing sites, internal and external business partners.
The Quality Assurance Analyst role will be responsible to development test cases based on functional requirements. This role will also be responsible for tracking and validating test cases. The Software Assurance Analyst is also expected to execute test cases, log defects, and/or triage existing defects to ensure software releases and updates are flawless. The Software Quality Analyst may build and execute automated test scripts. The ideal candidate has the ability to;


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Headphone Deals
Jabra Elite Active 65T Edition is engineered for true wireless music, calls, and sport, and features a secure-fitting design for enhanced in-ear stability when you're Active, customizable equalizer, integrated motion sensor, and up to 15 hours battery life 5 hours in the earbuds, and an extra 10 hours from the included, pocket friendly charging case. This product version offers a Free 3-month subscription to Music Unlimited.
Warranty:90 Day Warranty
- TRUE WIRELESS EARBUDS FOR AN ACTIVE LIFESTYLE Wherever your day takes you, whatever your activity, it won't get in the way of enjoying sports, music, and calls; The Elite Active 65t are secure fitting earbuds that provide dependable in-ear stability
- PERSONALIZE YOUR SOUND: Whether you're using these as Apple earbuds, Samsung earbuds or more, you can listen to your music the way you want to hear it, by personalizing your sound on the Jabra Sound+ app. Earbuds are Apple and Android compatible
- NO AUDIO DROPOUTS With Jabra's 3rd generation true wireless stability, you can take calls and listen to music without worry about audio dropouts; And there are no pesky wires getting in the way of your workout
- UP TO 15 HOURS OF USE With up to 5 hours of battery on a single charge, and up to 15 hours in total with the included pocket-friendly charging case, your listening needs are met from the start of the day to its end with these earbuds
Packaging:Non-Retail (Bulk Packaging)
What you get:One [1] Jabra Elite 65tOne [1] Charging caseOne [1] Micro USB cableSix [6] Silicon ear-gelsOne [1] Card
The Jabra UC Voice 750 Light is a corded headset designed specifically for Unified Communications deployments. The UC Voice 750 Light is ideal for the office professional who often uses UC voice applications. It features a lightweight design for maximum comfort all day long.
The UC Voice 750 Light features superior sound clarity for softphone calls, conference calls, live presentations, and other multimedia applications. The microphone includes a noise reduction feature, ensuring that the recipient cannot hear background noise from the speaker's surroundings. This makes the headset suitable for use in louder office environments.
The Jabra UC Voice 750 Light has a flexible boom tip arm to ensure the ideal microphone placement.
The lightweight design makes the headset portable for professionals working from different locations and like all Jabra UC Voice 750 headsets, the UC Voice 750 Light comes with its own travel pouch and is easy to carry.
The Jabra UC Voice 750 Light is certified and optimized with all leading Unified Communications platforms. Simply connect the headset to the computer and it is ready to use.1 The intuitive call-control unit attached to the cord allows for fast user adoption.
Warranty:30 Day Warranty
- Monaural or binaural design
- Crystal clear wideband sound
- Padding on the headband for optimal comfort
- Adjustable speaker chambers for optimal coupling to the ear
- Ultra-soft and comfortable leatherette ear cushions
- Flexible boom arm tip for easy microphone adjustment
- Microphone with a superior noise-reduction feature
- Intuitive call-control unit for fast user adoption
- Plug-and-play USB connectivity
What you get:One [1] Jabra UC Voice 750 Noise Canceling USB Office Headset - Mono or Duo
The result of nearly 70 years of audio expertise from Onkyo, combined with Steve Harris' uncompromising sonic standards, has produced the ED-PH0N3S - on-ear headphones that deliver even-handed power and detail at all frequencies.
Fitted with two customized 40mm titanium drivers they convey stunning clarity in the mid and high-frequency ranges. Just as importantly, their unique ported bass sub-chambers help create a beautifully deep, muscular bottom-end response.
The pure silver coating on the plug and selected thick-gauge signal cables help ensure an accurate signal transition from the source to the driver. The non-detachable cable delivers an uninterrupted sound.
Q: Why are these headphones good for Rock and Metal?
A: With total involvement from Steve Harris these headphones are balanced for clean highs and lows but also for the all-important space in the mid-range to best display the dynamics and complexities of rock and metal music.
Q: What are the benefits of Titanium drive units?
A: Titanium is one of the strongest, lightest metals on earth which gives an ultra-clean and highly accurate sound; a major requirement that Steve demanded before he would put the band's name to them.
Q: Why the Silver contacts and not the commonly-used Gold?
A: Silver is the best conductor and does not influence the sound having any sonic character of its own. The cables are high-performance multi-strand conductors with a fabric cover to further protect the signal.
Technical Specifications
- Driver Type - Dynamic (Titanium coated diaphragm)
- Driver Size - 40mm
- Freq. Response - 10Hz – 27kHz
- Weight - 245g
- Max Input Power - 800mW
- Pressure Level - 105dB/mW
- Impedance - 32 Ohms
- Cable Length - 1.6m
- Plug Type - 3.5mm
- Supplied Adapter - 1/4 inch (6.35mm)
Warranty:1 Year Warranty
- Two customized 40mm titanium drivers that convey stunning clarity in the mid and high-frequencies
- Thick-gauge signal cables help ensure an accurate signal transition from the source to driver
- Beautifully deep, muscular bottom-end response
What you get:One [1] ED-PH0N3S Maiden Audio Headphones
One [1] 1/4 inch (6.35mm) adapter
Samsung Level On Premium Stereo Headphones
A true balance of beauty, performance, and convenience - the new Samsung Level On folding stereo headphones offer outstanding sound fidelity in a compact, on-the-ear design with foldable earpieces for convenient storage in transit. Designed with a modern, active lifestyle in mind, Level On is the perfect companion for your Samsung Galaxy smartphone or tablet.
Premium Sound from Samsung
Like all Samsung Level products, the Level On headphones were designed with audio quality first, delivering exceptional, full-range sound via large 40mm Drivers and advanced Dual Diaphragm technology. Combine this with ultra-soft, sound isolating earpads and the Level On produces rich, high-definition audio for a crystal-clear, natural tone no matter the musical selection or volume level.
In-Line Controls
Adjust the volume, pause/play, advance to the next track and control phone functionality from the convenient in-line, multifunction remote. S-Voice enabled for easy touch and talk phone operation.
Samsung Style
Designed to complement Samsung Galaxy smart devices, the Level On strikes the same balance between edge and elegance, presenting a fashion-forward look that is sure to get you noticed.
Ready to Go?
Included with your Level On headphones, you'll find a premium carrying case, detachable 3.5mm stereo cable with integrated remote and an airplane adapter.
Move Easily
When you are done listening, the innovative fold-up design, detachable audio cable and convenient custom fit carrying case make storing and transporting these headphones a snap.
Refined Streamlined Design
Inspired by minimal, organic elements from nature, the Level On's modern finishes, metal and chrome details and premium, soft-touch ear, and head pads give it a high-end--yet high-tech style.
Ergonomic and Comfortable
Designed to maximize listening comfort, the Level On is great for long flights or an evening of music. The ultra-soft noise isolation ear cushions and padded headband work with the lightly-tensioned frame for a fatigue-free listening experience.
Warranty:1 Year Warranty
- 40mm Dual Diaphragm audio for natural, clear sound
- S-Voice technology
- Folding design
- In-line remote control with volume adjust, play/pause, and skip functions.
What you get:One [1] On-Ear Headphones
One [1] Premium Carrying Case
One [1] Detachable 3.5pi Cable with Integrated Remote and Airplane Adapter
The Logitech G933 Artemis Spectrum is a wireless gaming headset worthy of serious audio fans. Designed for multiple platform compatibility, these gaming headphones are perfect for PCs, PS3s, PS4s, the Xbox One and any TV with powered USB or RCA audio output. The advanced Pro-G audio drivers deliver expansive cinematic 7.1 surround sound for lifelike in-game spatial awareness. This unique feature allows you to hear enemies sneaking around behind you as well as special ability cues, immersive environments, and inspiring gaming soundtracks with optimal sound precision.
Gamers have the flexibility to play for up to 12 hours without lighting or 8 hours with default lighting thanks to a lag-free 2.4Ghz wireless connection. You can also use the included analog cable with mobile devices or console controllers to play without using battery power. Additionally, the personalized gaming experience is enhanced by the customizable RGB lighting, swappable backlit custom tags, and 3 programmable G-keys to assign macros for complex game commands. The preset onboard equalizer and custom audio profiles let you personalize your sound to your specifications. Listen to music, games, and movies with audio preferences set to your standards.
The system requirements for the Logitech G933 Artemis Spectrum gaming headset include Windows 10, Windows 8.1, Windows 8, Windows 7, the PS4, the Xbox One, or the Xbox 360. An internet connection is required for Logitech Gaming Software installation as well as a USB port, a 3.5mm audio port, or RCA audio output ports. The 7.1 surround sound, lighting configuration, and G-key programming require Logitech Gaming Software. In the box, you'll find the Logitech G933 Artemis Spectrum Performance Gaming Headset, a 3.5mm analog cable w/ audio controls, an RCA to 3.5mm cable, a 3.5mm to 2.5mm audio adapter, a USB data/charging cable, a USB powered wireless mix adapter, and custom tags (left/right). This product has a wireless range of 15 meters indoors and 20 meters outdoors (which may vary with environmental conditions).
Frequency response - 20 Hz - 20 KHz
Ships in Brown Box. Brand New unit. Ships with all Original Logitech Accessories.
NOTE: USB adapter and rechargeable battery are located inside the earcup. On the outside of each earcup panel, you should see a small "Remove Panel" label with an arrow.
Warranty:1 Year Warranty
- SUPERIOR SOUND PERFORMANCE: The advanced Pro-GTM audio drivers deliver incredible audio with stereo, 7.1 Dolby Surround, or 7.1 DTS Headphone: X Surround Sound
- MULTI-PLATFORM COMPATIBILITY: This is the perfect headset for all of your devices, including PCs, PS3s, PS4s, the Xbox One and any TV with powered USB or RCA audio output and is also compatible to mac OS X 10.10 or later
- 2.4GHz WIRELESS OR WIRED CONNECTION: Get up to 12 hours of wireless battery life without lighting or 8 hours with default lighting on a lag-free wireless connection. This is also available with analog cable connections for unlimited connectivity
- MULTIPLE SOURCE AUDIO MIXING: Plug in up to three devices (1 USB and 2 analogs) to answer calls and play music while gaming
- FULLY CUSTOMIZABLE: Enjoy a seamless, personalized gaming experience with customizable RGB lighting, swappable backlit custom tags, and 3 programmable G-keys to assign macros for complex game commands
Packaging:Non-Retail (Bulk Packaging)
What you get:One [1] Logitech G933 Performance Gaming Headset - Black OR Snow White
One [1] Logitech 3.5mm analog cable with audio controls
One [1] Logitech RCA to 3.5mm cable
One [1] Logitech USB data/charging cable (located inside the earcup)
One [1] Logitech USB powered wireless mix adapter
- Up to 8 hours of battery life for when you're on the go
- With Fast Fuel, a 5-minute charge gives you 2 hours of playback when the battery is low
- Flex-Form cable provides all-day comfort with easy purse and pocket portability
- Take calls, control your music, and activate Siri with RemoteTalk
Warranty:30 Day Warranty
- Perfect wireless companion for you to experience authentic, clear sound throughout your day with up to 8 hours of battery life
- Take calls, control your music and activate Siri with RemoteTalk. With Fast Fuel, a 5-minute charge gives you 2 hours of playback when the battery is low
- Variety of ear tip options offer personalized comfort and secure-fit wingtips provide stability
- Magnetic earbuds keep your earphones tangle-free and easily coil up for compact portability
- Comes with BeatsX earphones, removable secure-fit wingtips, eartips with four size options, lightning to USB-A charging cable and quick start guide
Packaging:Non-Retail (Bulk Packaging)
What you get:One [1] BeatsX earphones
Eight [8] eartips with four size options
One [1] Lightning to USB-A charging cable
One [1] quick start guide
One [1] warranty card
Comprising a pair of wireless earphones styled in black, the Beats by Dr. Dre Powerbeats3 power onward for up to 12 hours off a single charge. In a pinch, you can charge their on-board Lithium-Ion battery for five minutes to give you one hour of playing time. They feature secure-fit earhooks and a sweat- and water-resistant design optimized for workouts in particular, and life in general. The presence of Apple's proprietary W1 chip makes the process of pairing as painless as placing the product in proximity to your phone and powering it on. They can simultaneously pair with your Apple Watch, iPad, and Mac, provided you have an iCloud account, the proper operating systems, and all of the aforementioned products. The Powerbeats3's ergonomic design ensures a clear and dynamic sound, while the microphone and RemoteTalk function allow you to answer calls, play music, adjust volume, and talk to Siri from time to time. The earphones come with an included charging cable, a carrying case, and four sets of eartips to fit any shape of the ear.
Condition:A Grade Refurbished
Warranty:30 Day Warranty
- Bluetooth Wireless Pairing
- Apple W1 Chip for Quick Pairing
- Simultaneous Pairing with iOS Devices
- Secure Wingtips
- RemoteTalk Controls Music, Calls & Siri
- Built-In Rechargeable Battery
- 12-Hour Battery Life
- 5-Minute Charge for 1 Hour of Play
Packaging:Non-Retail (Bulk Packaging)
What you get:One [1] Headphones
Three [3] Sizes Ear Buds
One [1] Charging Cable
Solid, Powerful
Suitable for headphones ranging from 16 to 150 Ohms, the A3 is potent enough to drive all but the most power hungry headphones. Use the low gain setting with high sensitivity IEMs, or switch it to high gain for full size headphones.
Audiophile Grade Design
The A3 offers superior sound quality through expertly selected components and design. Its pre-amplifier section is based on the TI OPA1642, with excellent layering, midrange resolution, and high frequency extension. The power amplifier section relies on the AD8397 for great bass control and smooth drive characteristics.
Sophisticated Bass Boost
A fully discrete bass boost circuit increases output by 3.5dB at 60Hz, producing a gentle swell of low end energy that preserves the overall sound field. The bass boost circuit is completely bypass when off to ensure low noise floor and purity of sound quality.
The A3 is handsome with an all aluminum body and chassis. Not only is it solid and sturdy, it also provides superior shielding from EM interference. A knurled volume knob is mated to a smooth turning ALPS potentiometer. Toggle switches are used for enhanced reliability and are easier to operate. A 1400mAh internal battery powers the A3 for up to 16 hours of use.
Product Specifications:
- Audio Input: 3.5 mm stereo Jack
- Headphone output: 3.5 mm stereo Jack
- Drive ability: 16 - 150 Ohm
- Power input: recommend DC5V 1A
- Battery Capacity: 1400 mAh
- Battery Life: 16 hrs
- Charging Time: 4 hrs
- THD: 0.004% (1 kHz)
- Output Impedance: 0.2 ohm
- Frequency Response: 20 Hz - 20 kHz
- Weight: 92 g
Warranty:1 Year Warranty
- Hi-Res Audio Certified Titanium Edition FiiO A3 - Unlease power and audio quality for headphones ranging from 16 to 150 Ohms. Gain switch for matching output to headphone power needs.
- Renowned sound quality through expertly selected components and design, utilizing OPA1642 preamp and AD8397 amp section.
- Fully discrete bass boost circuit increases output by 3.5dB at 60Hz, with bypass when off.
- Handsome all aluminum body and chassis is sturdy and shielding against EM interference.1400mAh internal battery powers for up to 16 hours of use.
What you get:One [1] FiiO A3 Portable Headphone Amplifier
A Headset for Gamers: Experience everything from the big booms to whisper-quiet warnings in stunning 7.1 virtual surround sound and chat with friends through the hidden, noise-canceling microphones.
With the Headset Companion App, download custom audio modes created exclusively for PlayStation 4 systems by developers that are specifically tuned to enhance the audio in your favorite games./p>
Designed with PlayStation VR in mind: Explore the incredible worlds of VR with a headset to be worn comfortably along with PlayStation VR./p>
Warranty:30 Day Warranty
- high fidelity 7.1 virtual Surround sound
- Vita/PC Gold wireless stereo headset
- noise-canceling microphone
- With the headset companion App, listen to both game audio and chat audio simultaneously
- Use the sound/chat button to adjust volume of game audio vs. chat audio
What you get:One [1] Sony Interactive Entertainment Gold Wls Headset - PlayStation 4
Please note: These units are Manufacturer Refurbished. Item Is In Excellent Condition. Device may show some light scuffs or marks from handling.
Fine-tuned acoustic design delivers an exceptional listening experience
Optimal ergonomic design for all-day comfort
Variety of Ear tip options provide individualized fit for noise isolation
Tangle-free flat cable and magnetic ear buds offer easy portability
Take calls, control your music, and activate Siri with remote Talk
Condition:Manufacturer Refurbished
Warranty:30 Day Warranty
Features:Please see description
Packaging:Non-Retail (Bulk Packaging)
What you get:One [1] Headphones
Go all out with the Jaybird X3 Wireless Headphones! These earbuds are designed to be tiny but packed to the brim with functionality, unbeatable comfort, and incredible sound quality.
The 3rd incarnation in Jaybird's X series, these are the culmination of the company's sports earbud innovations. Smaller than ever, the X3 has a longer battery life, better sound, and a more secure fit. The in-ear speaker design has been significantly reduced by 20% and houses an enhanced 6mm driver for subtle lows and a booming bass. The smaller frame is more convenient to handle and offers a comfortable fit for different ear sizes. The earbuds can even be worn underneath a helmet. The frame is made from sandblasted, injection-molded metal for heavy-duty durability and a sleek style that does not affect Bluetooth signal strength. Additionally, the hydrophobic nano-coating makes the whole earbud waterproof, preventing sweat, snow, and rain from affecting your soundtrip! The X3 serves as a reliable partner for athletes and savvy business travelers who are always on the go. Be ready to answer an important call anywhere with confidence!
A wide variety of customized fit options are already included inside the box. The patented silicone ear fins (S, M, L) keep the buds securely inside your ear or can be used to hang them over the top. Lift the cord off your neck for a comfortable workout experience! Additionally, the Comply memory foam ear tips are designed to provide maximum noise isolation and comfort. They lock in the headphone for a super secure fit, whether you're on a calm jog or riding an MTB trail.
Also, the MySound app allows you to customize every aspect of your sound: from the rumbling lows to the sweetest highs! Customize every detail with the easy-to-understand interface. Compatible with iOS 9+ and Android 4.4+, your customized presets save directly onto the X3 buds, carrying them over to any music device or streaming service/app you use. Listen to the way you want to or discover how your favorite athletes and artists enjoy their music through their custom sound profiles. Also, the Multipoint function allows you to simultaneously pair and connect the X3 buds to two different Bluetooth devices. Listen to your music through your laptop while still answering calls on your phone with the bud controller. You can also share your music with ease, as two separate buds can connect to the same Bluetooth device, eliminating the need to share earphones. You can even connect to your smartwatch and leave your smartphone at home!
With 8 hours of battery life, the Jaybird X3 is just as ready as you are for an exciting adventure! Run wild and stop worrying about your sound quality. The X3 has got you covered.
Warranty:One Year Warranty
- MINI WIRELESS BUDS – The X3 Headphones by Jaybird are designed to be as small as possible without sacrificing performance and looks
- UNIVERSAL SECURE FIT –The patented silicone ear fins securely attach to the top and back/lower surface areas of the ear for a snug fit, locking the earbuds in during workouts and intense physical activities. Includes multiple sizes of silicon and Comply tips for maximum noise isolation, fit, and comfort
- SWEAT-PROOF – Built to last with a sleek yet rugged design, the X3 Headphones are great for sports, workouts, and all weather conditions. Their hydrophobic nano-coating will keep moisture away, whether it's sweat, rain, or snow
- LONG BATTERY LIFE – Don't let a low battery interrupt your day. The X3 has a 8-hour battery life. 15 minutes of charging gives you a full hour of playtime, so you'll always be ready for anything. Operation : Operating: 32º F - 113º F (0º C - 45º C . Storage: 14º F - 122º F (-10º C - 50º C)
- PERSONALIZED SOUNDS – The MySound App allows you to tweak and customize the sound of your X3 headphones for a personalized experience, and save them for later as a profile
Packaging:Open Box (Retail)
What you get:
- One [1] Jaybird X3 Wireless Earbud Headphones - Black / Green (Size M Ear fins preinstalled)
- Two [2] Pairs of Secure-Fit Ear Fins (S, L)
- Two [2] Pairs of Silicone ear tips (S, L)
- Three [3] Pairs of isolation foam ear tips (S, M, L)
- Two [2] Cord Clips
- One [1] Shirt Clip
- One [1] USB Charging Cable
- One [1] Carrying bag
These headphones are refurbished and are shipped in bulk packaging.The Powerbeats3 by Beats by Dr. Dre power onward for up to 12 hours off a single charge. In a pinch, you can charge their on-board Lithium-Ion battery for five minutes to give you one hour of playing time. They feature secure-fit earhooks and a sweat- and water-resistant design optimized for workouts in particular, and life in general.
The presence of Apple's proprietary W1 chip makes the process of pairing as painless as placing the product in proximity to your phone and powering it on. They can simultaneously pair with your Apple Watch, iPad, and Mac, provided you have an iCloud account, the proper operating systems, and all of the aforementioned products.
The ergonomic design ensures a clear and dynamic sound, while the microphone and RemoteTalk function allow you to answer calls, play music, adjust volume, and talk to Siri from time to time. The earphones come with an included charging cable, a carrying case, and four sets of eartips to fit any shape of ear.
Apple W1 Chip
Beats and Apple are changing the way you listen to music with the introduction of Apple W1 technology in Powerbeats3 Wireless. Incorporating the incredible W1 chip brings seamless setup and switching for your Apple devices, amazing battery life and 5-minute Fast Fuel charging.
Up To 12 Hours Of Battery Life
Keep the hours of training coming as Powerbeats3 Wireless are now powered for the long haul with the efficiency of the Apple W1 technology, which brings 12 hours of battery life, 5-minute Fast Fuel, and seamless setup and switching for your Apple devices.
Sweat & Water Resistant
Rain, sweat or shine-these water resistant earphones push you further and handle tough training.
Condition:Grade A Refurbished
Warranty:30 Day Warranty
- Connect via Class 1 Bluetooth® with your device for wireless workout freedom
- Up to 12 hours of battery life to power through multiple workouts
- With Fast Fuel, a 5-minute charge gives you 1 hour of playback when battery is low
- Sweat and water resistance to handle tough training
- Flexible, secure-fit earhooks maximize comfort and stability
- Dynamic, high-performance sound pushes you to the next level
- Take calls, control your music and activate Siri with RemoteTalk
Packaging:Non-Retail (Bulk Packaging)
What you get:One [1] Headset with New Ear Gels in Multiple Sizes
One [1] USB Charger
The Jaybird Sport Bluetooth buds deliver superior audio performance (music & calls) rivaling the best in wired headphones. Patented secure-fit for ultra comfort, ready for anything you can dish out on the trail, on the streets, in the gym or on the slopes.
Listen to music and take calls wirelessly with the Jaybird Freedom F5 Wireless Headphones. With a lightweight design, ergonomic ear tips, and 8 hours of play time on a full charge, these headphones give you everything you need to listen to your favorite songs the way they were meant to be heard. Wear the headphones to class, the office, the gym, or anywhere in between. No matter where you go, these headphones will stay comfortable and secure. Your Jaybird Headphones are available is Black, Gold, Blue or Red.
The Evolution Of Wireless Sound
The smallest wireless buds ever, with insanely big sound in a stunning patented secure-fit sweat-proof, ultra-comfort metal design.
Power Your Passion
Obsess with bringing music to your active life, enhancing the athletic experience and elevating your adventures.
Micro-Sized, Premium Metal Buds
In-ear sport Bluetooth buds have traditionally used all plastic materials, as metal inhibits signal performance. The innovative engineering and miniaturization has re-invented the manufacturing process, using high-quality injection molded metal parts creating stunning fashionable accents with a premium iconic feel — without affecting signal performance. The all-metal housing has the added benefit of removing distortion resulting in an incredible sound never before heard in a wireless in-ear bud.
Upgrade Your Ride
That perfect song – sets fire to your soul and liberates your workout which elevates everything you do. From the trails to the streets, Freedom delivers.
Sport + Fashion
Elegant sand-blasted metal accents in vibrant colors become an extension of your personality and style, while also being more rugged than ever, bringing your music to wherever you play.
The headphones reinvented audio for sport, with the smallest ever wireless buds and an incredible patented universal over/under secure ear-fit system.
My Sound
Customize your sound to the way you want to hear your music. Your own sound profile is then saved on your Freedom buds no matter what music device they're paired with or what music service you use. No more complaints of too much or not enough bass – you're now in control.
8 Hours Of Playtime
Revolutionary on-the-go charging for truly infinite battery life. 4 hours on the buds + 4 hours on the included charging clip means you never have to stop — you can listen while you charge!
Warranty:One Year Warranty
- 8 hours of playtime on a single charge
- Comfortable, ergonomic ear tips
- Inline mic for calls
- Remote gives you complete control of you music and calls
- Wireless music and calls with complete remote controls
- Patented micro-sized premiummetal buds
- Patented secure-fit with enhanced comfort earfins
- My sound app (customize your sound settings and save them to your buds)
What you get:One [1] Pair of Jaybird Freedom F5 In-Ear Premium Wireless Headphones
Your Powerbeats3 by Beats by Dr. Dre power onward for up to 12 hours off a single charge. In a pinch, you can charge their on-board Lithium-Ion battery for five minutes to give you one hour of playing time. They feature secure-fit ear hooks and a sweat- and water-resistant design optimized for workouts in particular, and life in general.
The presence of Apple's proprietary W1 chip makes the process of pairing as painless as placing the product in proximity to your phone and powering it on. They can simultaneously pair with your Apple Watch, iPad, and Mac, provided you have an iCloud account, the proper operating systems, and all of the aforementioned products.
The ergonomic design ensures a clear and dynamic sound, while the microphone and Remote Talk function allow you to answer calls, play music, adjust volume, and talk to Siri from time to time.
The earphones come with an included charging cable and ear tips to fit any shape of ear.
Condition:Grade A Refurbished
Warranty:90 Day Warranty
- Connect via Class 1 Bluetooth® with your device for wireless workout freedom
- Up to 12 hours of battery life to power through multiple workouts
- With Fast Fuel, a 5-minute charge gives you 1 hour of playback when battery is low
- Sweat and water resistance to handle tough training
- Flexible, secure-fit earhooks maximize comfort and stability
- Dynamic, high-performance sound pushes you to the next level
- Take calls, control your music and activate Siri with RemoteTalk
Packaging:Non-Retail (Bulk Packaging)
What you get:
One [1] Beats by Dr. Dre Powerbeats³ Wireless In-Ear Headphones
One [1] Charging cable
One [1] Eartips
Designed for sound, tuned for emotion
The Solo2 has arrived. Beats' most popular headphone has been redesigned from the inside out. With updated and improved acoustics, the Solo2 lets you feel your music with a wider range of sound and enhanced clarity. Streamlined, lightweight, and durable, this compact headphone is more comfortable than ever. Take your music with you wherever you go, with the Solo2.
Feel a new kind of sound
Immerse yourself in an emotional experience. The Solo2 has a more dynamic, wider range of sound, with a clarity that will bring you closer to what the artist intended. Whether you're into hip-hop, heavy metal, jazz or electronic, you will feel the higher fidelity sound in your Solo2 .
Custom comfort
Engineered for comfort. Starting at the center of the flexible headband, the frame of the headphone has been curved like never before, giving the Solo2 a custom-fit feeling. The earcups have been ergonomically angled out to complete this natural fit, with pivots for optimal comfort and sound delivery. Finally, with their premium material, the earcups help dissipate heat and minimize sound leakage.
Streamlined design
Think luxury sports car. The Solo2 boasts a streamlined aesthetic with fast flowing curves and no visible screws. Disciplined decisions in engineering and material selection have created a more durable headphone that is equipped for extended use. Easily foldable, this premium headphone is ready for your life on the go.
Please note: This unit ships with an AUX Cable that does NOT include a remote or Mic. Only Audio.
Warranty:30 Day Warranty
- Connectivity Technology: Wired
- Fine-tuned acoustics for clarity, breadth and balance
- Streamlined design for a custom-fit
- Durable and foldable so you can take them on-the-go
Packaging:Non-Retail (Bulk Packaging)
What you get:One [1] Beats Solo2 Wired On-Ear Headphone - Black
Please note: Ships without the retail packaging to save on shipping. You will receive everything shown in the first picture. A headset is in new condition and includes all original accessories.
Reliable Call Clarity, Indoors and Out
Focus On What You're Saying—Not Where You're Saying It
From bustling city streets to the corner café, some of life's most important calls happen in the most unexpected places. Our cutting edge noise-canceling and WindSmart technology work together to eliminate disruptive background noise, wherever you are. Your voice sounds clear and professional as you seamlessly transition between environments, inside or out. Now anywhere is a great place to talk.
Eliminate background noise like the wind with six layers of exclusive WindSmart technology.
Cancel disruptive sounds like traffic or chatter with four-mic noise canceling.
Rigorously tested for all-day stability and comfort.
Roam farther with extended Bluetooth range up to 98 feet/30 meters.
Smart, Helpful Sensors
Designed for non-stop days, every detail simplifies mobile communications; from caller ID to voice control to smart audio routing. Voyager 5200 automatically detects whether or not it's being worn, directing call audio where you expect to hear it.
Made for the Real World
Four microphones work together with exclusive Windsmart technology to eliminate disruptive noise and outsmart the wind. The P2i nano-coating protects it from humidity, sweat, and water splashes (IPX4). Now you can turn anyplace into a perfect workplace.
Portable Power Option
Recharge on the go with the Voyager 5200 charging case and docking stand (sold separately) and get up to 14 extra hours of power (that's two full back-up charges).
Productivity App
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Warranty:One Year Warranty
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Packaging:Non-Retail (Bulk Packaging)
What you get:One [1] Plantronics VOYAGER 5200 Bluetooth Headset
One [1] Micro USB Charge Cable
One [1] Car Charger Adapter
One [1] S, M, L Eartips
One [1] User Manual
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Private Equity Profile
In the last 3 years, Beringea has invested in 5 companies.
Beringea's most common sectors for investment are internet software and services (14%) and business services (9%). The Firm's most common investment types include growth capital (53%) and venture (31%). In total, Beringea has invested in 9 US states and 3 different countries. Its largest (disclosed) acquisition occurred in 2013 when it acquired Young Innovations for $314M.
In the last 3 years, Beringea has exited 6 companies. The Firm's most common exit type is trade sale (75%). Beringea's largest (disclosed) exit occurred in 2019 when it sold Ranir for $750M.
Join Mergr to view Beringea's full profile and discover more middle-market private equity firms just like it.
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M&A Total Activity93
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Heating system with vapour compressor heat pump and vertical U-tube ground heat exchanger
Małgorzata Hanuszkiewicz-Drapała
Jan Składzień
Archives of Thermodynamics | 2010 | No 4 October
Heat pump
Ground heat exchanger
Heating system
Numerical modelling
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In the paper a heating system with a vapour compressor heat pump and vertical U-tube ground heat exchanger for small residential house is considered. A mathematical model of the system: heated object - vapour compressor heat pump - ground heat exchanger is presented shortly. The system investigated is equipped, apart from the heat pump, with the additional conventional source of heat. The processes taking place in the analyzed system are of unsteady character. The model consists of three elements; the first containing the calculation model of the space to be heated, the second - the vertical U-tube ground heat exchanger with the adjoining area of the ground. The equations for the elements of vapour compressor heat pump form the third element of the general model. The period of one heating season is taken into consideration. The results of calculations for two variants of the ground heat exchanger are presented and compared. These results concern variable in time parameters at particular points of the system and energy consumption during the heating season. This paper presents the mutual influence of the ground heat exchanger subsystem, elements of vapour compressor heat pump and heated space.
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Utilization of the horizontal ground heat exchanger in the heating and cooling system of a residential building
Małgorzata Hanuszkiewicz-Drapała
Tomasz Bury
Archives of Thermodynamics | 2016 | No 1
heat pump
ground heat exchanger
heating system
numerical modelling
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This paper presents the results of thermodynamic analyses of a system using a horizontal ground heat exchanger to cool a residential building in summer and heat it in the autumn-winter period. The main heating device is a vapour compression heat pump with the ground as the lower heat source. The aim of the analyses is to examine the impact of heat supply to the ground in the summer period, when the building is cooled, on the operation of the heating system equipped with a heat pump in the next heating season, including electricity consumption. The processes occurring in cooling and heating systems have an unsteady nature. The main results of the calculations are among others the time-dependent values of heat fluxes extracted from or transferred to the ground heat exchanger, the fluxes of heat generated by the heat pump and supplied to the heated building by an additional heat source, the parameters in characteristic points of the systems, the temperature distributions in the ground and the driving electricity consumption in the period under analysis. The paper presents results of analysis of cumulative primary energy consumption of the analyzed systems and cumulative emissions of harmful substances. Słowa kluczowe
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Determinants of the experts evaluation of journals in economic sciences
Jacek Osiewalski
Anna Osiewalska
Nauka | 2017 | No 1
| 125-141
multiple regression statistical model
model reduction
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In 2015 an important part of the official evaluation of Polish scientific journals was left to experts' judgement. In this paper we try to establish which observable factors (with available data) are closely related to the outcome of experts' evaluation of Polish journals in economic sciences. Using the multiple regression statistical model we show that only 5 variables (out of 17) significantly explain almost 50% of the empirical variance of the experts' evaluation. The determinants of particular interest, not entering the formal criteria and not related to the impact on global science, are: the number of citations mainly in Polish journals and the affiliation with the Polish Academy of Sciences.
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Modeling of the internal combustion engine cooling system
Zbigniew Kneba
Archives of Thermodynamics | 2019 | vol. 40 | No 3
Combustion engine
Cooling system
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The article concerns computer modelling of processes in cooling systems of internal combustion engines. Modelling objectives and existing commercial programs are presented. It also describes Author's own method of binding graphs used to describe phenomena in the cooling system of a spark ignition engine. The own model has been verified by tests on the engine dynamometer. An example of using a commercial program for experimental modelling of an installation containing a heat accumulator is presented.
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A new method for system modelling and pattern classification
L. Rutkowski
Bulletin of the Polish Academy of Sciences: Technical Sciences | 2004 | vol. 52 | No 1
| 11-24
system modelling
pattern classification
neuro-fuzzy systems
flexible parameters
generalized triangular norms
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Abstract. In this paper we present a new class of neuro-fuzzy systems designed for system modelling and pattern classi.cation. Our approach is characterized by automatic determination of fuzzy inference in the process of learning. Moreover, we introduce several .exibility concepts in the design of neuro-fuzzy systems. The method presented in the paper is characterized by high accuracy which outperforms previous techniques applied for system modelling and pattern classi.cation.
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Numerical analysis of momentum transfer processes in a mechanically agitated air – biophase – liquid system
Monika Musiał
Magdalena Cudak
Joanna Karcz
Chemical and Process Engineering | 2017 | vol. 38 | No 3
numerical modelling
momentum transfer
gas – solid – liquid system
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The results of numerical computations concerning momentum transfer processes in an air – biophase – liquid system agitated in a bioreactor equipped with baffles and a Smith turbine (CD 6 impeller) are presented in this paper. The effect of sucrose concentration on the distributions of the velocity of the continuous phase, gas hold-up and the size of gas bubbles in the system was analysed. Simulation results were presented in the form of the contours of the analysed magnitudes. The effect of sucrose concentration on the averaged values (i.e. determined on the basis of local values) of gas hold-up and gas bubbles size was evaluated. The results of the numerical computations of gas hold-up were compared with our own experimental data.
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Modelling of a hybrid culture system with a stationary layer of liquid perfluorochemical applied as oxygen carrier
Maciej Pilarek
Katarzyna Dąbkowska
Chemical and Process Engineering | 2016 | vol. 37 | No 1 March
liquid perfluorochemical (fluorocarbon)
liquid gas carrier
mathematical modelling
cell/tissue culture
hybrid culture system
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A mathematical model of a hybrid culture system supported with a stationary layer of liquid perfluorochemical (PFC) as a source of O2 for cells which grow in the aqueous phase of culture medium has been developed and discussed. The two-substrate Monod kinetics without inhibition effects, i.e. the Tsao-Hanson equation, has been assumed to characterise the biomass growth. The Damköhler number which relates the growth rate to the mass transfer effects has been used to appraise the regime (i.e. diffusion-limited or kinetics) of the whole process. The proposed model predicted accurately previously published data on the submerged batch cultures of Nicotiana tabacum BY-2 heterotrophic cells performed in a culture system supported with a stationary layer of hydrophobic perfluorodecalin as a liquid O2 carrier. Estimated values of the parameters of the model showed that the process proceeded in the kinetics regime and the growth kinetics, not the effects of the mass transfer between aqueous phase and liquid PFC, had essential influence on the growth of biomass.
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Control and optimisation of photovoltaic water pumping system using sliding mode
L. Zarour
K. Abed
M. Hacil
A. Borni
Bulletin of the Polish Academy of Sciences: Technical Sciences | 2019 | 67 | No. 3
photovoltaic pumping system modelling
maximum power point
sliding mode control
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A sliding mode controller for the photovoltaic pumping system has been proposed in this paper. This system is composed of a photovoltaic generator supplying a three-phase permanent magnet synchronous motor coupled to a centrifugal pump through a three-phase voltage inverter. The objective of this study is to minimise the number of regulators and apply the sliding mode control by exploiting the specification of the field oriented control scheme (FOC). The first regulator is used to force the photovoltaic generator to operate at the maximum power point, while the second is used to provide the field oriented control to improve the system performance.The whole system is analysed and its mathematical model is done. Matlab is used to validate the performance and robustness of the proposed control strategy.
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Numerical modelling of ozonation process with respect to bromate formation. Part I – Model development
Urszula Olsińska
Chemical and Process Engineering | 2019 | vol. 40 | No 1
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The paper focuses on the modelling of bromate formation. An axial dispersion model was proposed to integrate the non-ideal mixing, mass-transfer and a kinetic model that links ozone decomposition reactions fromthe Tomiyasu, Fukutomi and Gordon (TFG) ozone decaymodelwith direct and indirect bromide oxidation reactions, oxidation of natural organicmatter and its reactionswith aqueous bromine. To elucidate the role of ammonia an additional set of reactions leading to bromamine formation, oxidation and disproportionation was incorporated in the kinetic model. Sensitivity analysis was conducted to obtain information on reliability of the reaction rate constants used and to simplify the model.
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Tradition, modernity and deposit modelling problems
Edyta Sermet
Jerzy Górecki
Marek Nieć
Zeszyty Naukowe Instytutu Gospodarki Surowcami Mineralnymi Polskiej Akademii Nauk | 2017 | Nr 100
| 221–234
mineral deposits
geological modelling
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"Mineral deposit model", "deposit modelling" are the terms commonly used, although imprecise. This is often identified as the application of computerized methods to the elaboration and presentation of geological information, in particular for the mining design. Deposit modelling is the mode of presentation of deposit features, which in the meaning of the authors of such presentation, describes the deposit features between the points of observations as best as possible. Deposit modelling has a long history (XVI-XVII centuries), however such a term was not used. Varied methods of cartographic presentation of deposits and their features were proposed. The progress in the presentation of the deposit in space using isolines maps has led to the separation of methods of deposits geometrisation. Over time, a simple mathematical statistics method was used to describe the deposit parameters, followed by geostatistical methods. Some of them were however not commonly used as too troublesome. The computer based approach to the presentation of geological data has an unquestionable value but is accompanied by the possibility of inappropriate formalized and erroneous interpretations and a presentation as to whether the basic rules of geological knowledge were neglected. Deposits modeling is a conceptual task and cannot be fully automated.
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Numerical Simulation of Subsidence Caused by Roadway System
Piotr Polanin
Andrzej Kowalski
Andrzej Walentek
Archives of Mining Sciences | 2019 | vol. 64 | No 2
roadway system
numerical modeling
back analysis
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Exploitation of hard coal seams by roadway system is applied by two coal mines in southern Poland in Upper Silesian Basin. It is a secondary mining exploitation carries out in safety pillars of urban areas and shafts within mining areas of closed coal mines. Roadway system is the excavation process of gateways which are made in parallel order leaving coal pillars between them. An optimal width of coal pillar makes roadway stable and reduces subsidence of terrain surface. The article presents results of subsidence simulation caused by partial extraction using empirical and numerical methods on the example of one exploitation field of "Siltech" coal mine. The asymptotic state of subsidence was considered after mining ceased in the study area. In order to simulate of subsidence, numerical model of rock mass and model of Knothe-Budryk theory were calibrated. Simulation of vertical displacements in numerical method was carried out using RS3 program by Rocscience based on finite element method. The assumption was made that model of rock mass is transversely isotropic medium, in which panels were designed according to order of extraction of coal seams. The results of empirical and numerical methods were compared with measured values of subsidence at benchmarks along drawn lines (subsidence profiles).
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A review of the numerical studies on planar and tubular Solid Oxide Fuel Cells within four EU projects of the 7th framework programme
P. Pianko-Oprych
Z. Jaworski
T. Zinko
M. Palus
Chemical and Process Engineering | 2018 | vol. 39 | No 4
Solid Oxide Fuel Cell
fuel cell system
Computational Fluid Dynamics
Finite Element Method
Process simulation
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The paper addresses the issues of quantification and understanding of Solid Oxide Fuel Cells (SOFC) based on numerical modelling carried out under four European, EU, research projects from the 7FP within the Fuel Cell and Hydrogen Joint Undertaking, FCH JU, activities. It is a short review of the main projects' achievements. The goal was to develop numerical analyses at a single cell and stack level. This information was integrated into a system model that was capable of predicting fuel cell phenomena and their effect on the system behaviour. Numerical results were analysed and favourably compared to experimental results obtained from the project partners. At the single SOFC level, a static model of the SOFC cell was developed to calculate output voltage and current density as functions of fuel utilisation, operational pressure and temperature. At the stack level, by improving fuel cell configuration inside the stack and optimising the operation conditions, thermal stresses were decreased and the lifetime of fuel cell systems increased. At the system level, different layouts have been evaluated at the steady-state and by dynamic simulations. Results showed that increasing the operation temperature and pressure improves the overall performance, while changes of the inlet gas compositions improve fuel cell performance.
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Modelling and Designing of Ultrasonic Welding Systems
Andrzej Milewski
Piotr Kluk
Witold Kardyś
Paweł Kogut
Archives of Acoustics | 2015 | vol. 40 | No 1
ultrasonic welding and cutting system
ultrasonic stack modelling and designing
digitally controlled ultrasonic power supply
ultrasonic stack e-diagnosis
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This article presents the main stages and challenges in modelling and designing of modern ultrasonic welding and cutting systems. First, the key components of such a system, such as an ultrasonic stack (con- sisting of a high power ultrasonic transducer and a sonotrode) and a digitally controlled ultrasonic power supply with precise control of the output power, have been considered. Next, a concept of measurement system for verification and validation of mathematical models of ultrasonic stacks and its components has been presented. Finally, a method of ultrasonic stack e-diagnosis based on ultrasonic transducer electrical impedance measurement during welding and cutting process has been described
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Thermodynamic Description of Ternary FE-B-X Systems. Part 4: FE-B-V
J. Miettinen
V.-V. Visuri
T. Fabritius
N. Milcheva
G. Vassilev
Archives of Metallurgy and Materials | 2019 | vol. 64 | No 2
phase diagrams
thermodynamic modelling
Fe-based systems
Fe-B-X systems thermodynamic database
Fe-B-V system
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Thermodynamic descriptions of the ternary Fe-B-V system and its binary sub-system B-V, are developed using experimental thermodynamic and phase equilibrium data from the literature. The thermodynamic parameters of the other binaries, Fe-V and Fe-B, are taken from earlier assessments slightly modifying the Fe-V description. The work is in the context of a new Fe-B-X (X = Cr, Ni, Mn, V, Si, Ti, C) database. The solution phases are described using substitutional solution model. The borides are treated as stoichiometric or semi-stoichiometric phases and described with two-sublattice models.
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Artificial Neural Network to the Control of the Parameters of the Heat Treatment Process of Casting
A. Bokota
A. Kulawik
J. Wróbel
Archives of Foundry Engineering | 2015 | No 1
Heat treatment
Moving heat source
Artificial neural network
Numerical modelling
System of the control of the heatingprocess
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In the paper the use of the artificial neural network to the control of the work of heat treating equipment for the long axisymmetric steel elements with variable diameters is presented. It is assumed that the velocity of the heat source is modified in the process and is in real time updated according to the current diameter. The measurement of the diameter is performed at a constant distance from the heat source (∆z = 0). The main task of the model is control the assumed values of temperature at constant parameters of the heat source such as radius and power. Therefore the parameter of the process controlled by the artificial neural network is the velocity of the heat source. The input data of the network are the values of temperature and the radius of the heated element. The learning, testing and validation sets were determined by using the equation of steady heat transfer process with a convective term. To verify the possibilities of the presented algorithm, based on the solve of the unsteady heat conduction with finite element method, a numerical simulation is performed. The calculations confirm the effectiveness of use of the presented solution, in order to obtain for example the constant depth of the heat affected zone for the geometrically variable hardened axisymmetric objects.
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Seismic crustal structure of the Bransfield Strait, West Antarctica
Tomasz Janik
Polish Polar Research | 1997 | vol. 18 | No 3-4
| 171-225
Bransfield Rift
crustal structure
seismic modelling
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Four Geodynamical Expeditions of the Polish Academy of Sciences carried through wide research seismic program in West Antarctica in 1979-1991. Three of these expeditions operated in the Bransfield Strait. The experiment of deep refraction and wide-angle reflection in West Antarctica focused on deep structure of the lithosphere, mainly of the Earth's crust. The network of deep seismic soundings (DSS) profiles covered all the Bransfield Strait. Five land stations on the South Shetland Islands, three stations on the Antarctic Peninsula and nine ocean bottom seismographs (OBS) recorded seismic waves, generated by explosions in a sea. The Bransfield Rift and the Bransfield Platform form a marginal basin against a volcanic arc of the South Shetland Islands. The paper presents new results of 2-D seismic modeling for network of five selected profiles. Four of them, ranging in lenght from 150 to 190 km, crossed main structures of the Bransfield Strait and the fifth, which connected the other ones and was 310 km long, ran along the Bransfield Rift. Two or three seismic models were presented for each profile. Finally, mutually corrected and controlled 2-D models of described profiles were constructed. They all presented spatial complex structure of the Earth's crust in a young rift of the Bransfield Strait, including extent of its main element i.e. anomalous high velocity body (HVB) (Vp > 7.4 km/s), detected in 10-30 km depth range except profile DSS-4 (southwest part of the Bransfield Strait). This inhomogeneity is interpreted as intrusion of the upper mantle (?asthenosphere) during stretching of the continental crust. The Moho discontinuity was found at depth 30-35 km, with velocities equal to about 8.1 km/s.
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Possibilities of using MineScape software to analyze the model of cutting ore deposit
Krzysztof Skrzypkowski
Waldemar Korzeniowski
Andrzej Gądek
Radosław Misiak
Zeszyty Naukowe Instytutu Gospodarki Surowcami Mineralnymi Polskiej Akademii Nauk | 2018 | Nr 103
model of ore deposit
cut of deposit
design of exploitation
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The contemporary underground mining of raw minerals is more and more associated with geological and mining software packages which support the work of designers from the moment of the exploration of a deposit, determination of its size and quality, geological, hydrogeological and tectonic conditions, by planning the development and cutting of the deposit. Production planning is one of the most important activities carried out in the course of a mining project, because it allows to set specific production results of a mine in relation to a time unit, and then allows for a verification of the degree of completion of the assumed plan. At present, computer-aided design is applicable to daily or long-term output planning taking deposit, qualitative, quantitative and cost constraints into account. In the article, selected forms of ore deposits were presented. On the basis of several dozen boreholes up to 300m in length, an exemplary fragment of the ore cutting model using computer-aided design of mining works was presented. By using modern computer software - ABB MineScape with modular construction, the possibilities of improving the process of development of future exploitation areas have been determined. In particular, the arrangement of boreholes, based on which ones the cross sections were made with, present the exemplary lithostratigraphic thickness of layers, including the location of discontinuous deformations in the form of faults, and an ore bearing zone. For the block model, resources with priority for metal N o. 1 and 2 were calculated. I n the last section of the article, the cutting idea for a shallow ore deposit has been presented. The degree of effective use of the deposit has been analysed for the room and pillar mining method.
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The influence of dimension of mining crib model filled by waste rock on the course of load – displacement characteristic
Krzysztof Skrzypkowski
Zeszyty Naukowe Instytutu Gospodarki Surowcami Mineralnymi Polskiej Akademii Nauk | 2017 | Nr 99
| 131–142
cooper ore
model testing
wooden cribs
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The analysis of changes in the mechanical properties of wooden mining cribs under the influence of different types of exploitation loads is the question for which deals with many domestic and abroad research centers deal with. High The high interest in this subject results from the increase of the conducted depth exploitation, which contributes to the increase in both the vertical pres-sure and the complexity of geological – mining conditions and in- the intensification of natural hazards. Another reason is the tendency of decreasing the thickness of the exploited ores deposits. Wooden crib support is used Both both in underground ore, hard coal and salt mining is used wooden crib support. Mining cribs with various configurations are especially useful for the reinforcement of excavations workings behind the front and for further strengthen of the crossings. In particular, additional reinforcement support in the form of wooden cribs (pile supporting), which shall be left empty or filled with waste rock is applied in the ore mining in places where found extended rooms or drifts are found or in places with degraded roof conditions, applies additional reinforcement support in the form of wooden cribs (pile supporting), which shall be left empty or filled with waste rock. During underground ex-ploitation is produced waste Waste rock, which comes from the access, prepar-atory excavations and from ongoing field of exploitation is produced during underground exploitation. In the case of the underground exploitation of cop-per ore, waste rock is used to fill voids after exploitation as rock stowing. It is also used for filling mining wooden cribs, as an artificial support and for harder transportation roads. This paper presents the results of the laboratory strength tests performed on models of four-point timber cribs, built with beams set horizontally, at the ge-ometrical scale of 1:10. In the laboratory research Research wooden cribs models with size 200 × 200 × 200 mm and 100 × 100 × 100 mm were used in the laboratory. The paper describes the maximum loading capacity of the cribs consisted consisting only of beams and filled with waste rocks. In addition, a vertical and appropriate strain of cribs at maximum force was shown. On the basis of laboratory research it was found that the use of the same number of timbers and the management of waste rocks, the filling of the four-point cribs with the waste rocks allowed several times to increase its support to be increased several times.
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Numerical modelling of ozonation process with respect to bromate formation. Part II – Model validation
Urszula Olsińska
Chemical and Process Engineering | 2019 | vol. 40 | No 1
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Validation results of a theoretical model that describes the formation of bromate during ozonation of bromide-containing natural waters are presented. An axial dispersion model integrating the nonideal mixing, mass-transfer and a kinetic model that links ozone decomposition reactions from the Tomiyasu, Fukutomi and Gordon ozone decay model with direct and indirect bromide oxidation reactions, oxidation of natural organicmatter and reactions of dissolved organics and aqueous bromine was verified. Themodel was successfully validated with results obtained both at a laboratory and a full scale. Its applicability to different water supply systems was approved.
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Steady state characteristics of a three-phase fluidized bed bioreactor with partial biomass recirculation
Szymon Skoneczny
Bolesław Tabiś
Chemical and Process Engineering | 2019 | vol. 40 | No 1
fluidized bed
mathematical modeling
steady states
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The paper presents modeling and simulation results of the operation of a three-phase fluidized bed bioreactorwith partial recirculation of biomass. The proposed quantitative description of the bioreactor takes into account biomass growth on inert carriers, microorganisms decay and interphase biomass transfer. Stationary characteristics of the bioreactor and local stability of steady-stateswere determined. The influence of microbiological growth kinetics on the multiplicity of steady-states was discussed. The relationship between biofilm growth and boundaries of fluidized bed existence was shown.
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Traces of Cultural Diffusion in the Anthroponymy of Poznan (16th–18thCentury)
Irena Sarnowska-Giefing
Onomastica | 2016 | No 60
| 107-118
cultural onomastics
onymic models and pattern
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The author analyses onymic practices of Poznań–based craftsmen forming guilds. In the names of the inhabitants of Poznań, which stabilised until the end of the 18th century, she seeks traces of the so-called cognomens, i.e. secondary personal designations granted to apprentices who were becoming masters. The names resulted from community acts of creation, which were of ludic nature. Referring to German onymic practices and pointing to the so-called Schleifnamen, the author discusses specific codes of European middle-class culture. She focuses on the transfer of models and patterns to Polish urban communities.
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Model reduction problem of linear discrete systems: Admissibles initial states
A. Abdelhak
M. Rachik
Archives of Control Sciences | 2019 | vol. 29 | No 1
linear discrete systems
model order reduction
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Given a linear discrete system with initial state x0 and output function yi , we investigate a low dimensional linear systemthat produces, with a tolerance index ǫ, the same output function when the initial state belongs to a specified set, called ǫ-admissible set, that we characterize by a finite number of inequalities. We also give an algorithm which allows us to determine an ǫ-admissible set.
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The use of brain activity neuroimaging in pedagogy — cognitive and research influences
Jolanta Zielińska
Rocznik Komisji Nauk Pedagogicznych | 2018 | No LXXI
| 73-82
cognitive processes
brain activity
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The complexity of the phenomena associated with the course of the cognitive processes that determine an efficient learning, excludes the possibility of collecting knowledge in other ways than neuronal-information. It excludes also possibilities of interpreting it, in other ways than with use of respectively formalized cognitive models. The presented paper is a kind of summary of the latest achievements in this field.
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The future of crude oil and hard coal in the aspect of Poland's energy security
Aurelia Rybak
Anna Manowska
Polityka Energetyczna - Energy Policy Journal | 2018 | vol. 21 | No 4
crude oil market
energy resources
ARIMA model
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The article presents a synthetic analysis of the crude oil market in Poland. As of today, this safety is provided mainly on the basis of native lignite and hard coal resources. However, the analysis of the hard coal market conducted by the authors indicates that the carried out mining restructuring (among others) led to an excessive reduction of mining volume and employment level in the hard coal mining sector. This led to a precedent situation when Poland became an importer of this energy carrier. In addition, the European Union's requirements for greenhouse gas emissions must be taken into account. In connection with the above, it is necessary to search for new energy sources or technologies that enable hard coal to meet the requirements. It is possible to apply the so-called clean coal technologies that allow the greenhouse gas emissions generated during coal combustion to be reduced. As of today, they are not used on a mass scale, because the use of this type of technology involves additional financial expenses. However, taking into account that technologies have been growing faster and faster, are modernized in a shorter time, making a breakthrough discovery took hundreds of years, now it is often a few months, clean coal technologies can become the optimal solution in the near future. It is also necessary to diversify the sources of obtaining imported energy carriers. The article describes coal and crude oil in terms of their mutual substitution. The article is a continuation of research conducted by the authors. Previous publications presented considerations on analogous topics related to natural gas and renewable energy sources. The crude oil market in Poland was analyzed and forecasts for oil extraction and the demand in the world and Poland by 2023 were presented. The SARIMA model was also created. The model made it possible to obtain oil an prices forecast.
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Three-dimensional modelling of the crustal structure in the contact zone between Antarctic Peninsula and South Pacific from seismic data
Piotr Środa
Polish Polar Research | 2001 | vol. 22 | No 2
| 129-146
Antarctic Peninsula
seismic modelling
crustal structure
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During four Polish Geodynamical Expeditions to West Antarctica between 1979 and 1991, seismic measurements were made along 21 deep refraction profiles in the Bransfield Strait and along the coastal area of Antarctic Peninsula using explosion sources. Recordings were made by 16 land stations and 8 ocean bottom seismometers. Good quality recordings were obtained up to about 250 km distance. This allowed a detailed study of the seismic wave field and crustal structure. Three-dimensional tomographic inversion was carried out using first arrivals from the complete data set including off-line recordings. As a result, we obtained a 3-D model of the P-wave velocity distribution in the study area. In the area adjacent to the Antarctic Peninsula coast, sedimentary cover of 0.2 to 3 km thickness was found, whereas in the shelf area and in the Bransfield Strait sedimentary basins with thickness from 5 to 8 km were observed. In the Bransfield Strait a high velocity body with Vp > 7.5 km/s was found at 12 km depth. The use of the off-line data allowed for determination of the horizontal extent of the body. The thickness of the crust varies from more than 35-40 km in the coastal area south of the Hero Fracture Zone to 30-35 km in the area of Bransfield Strait and South Shetland Islands and about 12 km in the Pacific Ocean NW of South Shetland Islands.
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Household Tips For DIY Carpet Cleaning
Household Tips For DIY Carpet Cleaning
Living your carpets a great diy steam cleaning doesn't have to be difficult and here some suggestions that you can use to get your carpet cleaning done correctly.
Removing dog dirt from a carpet.
So you arrive down stairs in the morning to learn your young puppy dog has experienced "the squirts" at night time.
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Zhiyu Zhang, Hao Suo, Xiaoqi Zhao, and Chongfeng Guo
Photon. Res. 8(1) 32-38 (2020)
Yujin Chen, Yisheng Huang, Zhoubin Lin, and Yidong Huang
OSA Continuum 2(12) 3598-3603 (2019)
Ming Luo, Danyu Wu, Weizhong Li, Tao Zeng, Lei Zhou, Lingheng Meng, Xiang Li, and Shaohua Yu
J. Opt. Commun. Netw. 12(2) A204-A213 (2020)
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Holography in the 70s was expected to become a key-tool for analyzing a large diversity of industrial problems....
Retro-reflector corner cubes have been used for decades as back reflecting targets for laser and lidar alignment and...
Two hundred years after its invention, the Wollaston polarizing beamsplitter has a new and enticing competitor....


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Jayhawk Corner Cafe
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Topeka, KS 66603
Open Monday through Friday from 7:30 a.m. until 2:30 p.m., the Jayhawk Corner Cafe serves a fresh daily menu that includes an entree selection, vegetables, salad, homemade soup and dessert. Selections have include meatloaf, seasoned grilled chicken, beef brisket, grilled tandoori chicken, roasted turkey, chicken fried steak, barbeque pulled pork, and chicken enchiladas.
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Topeka Area Attractions
Great Overland Station
Topeka Scarecrows Professional Hockey
Kansas Museum of History
Sac and Fox Casino
Museum of the Kansas National Guard
Sports Center
Gage Park's Reinisch Rose Garden
Topeka Genealogical Society Library
Brown v. Board of Education
Curtis House


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Overview Hello there. Some of you may remember KLang. I decided that I should you know, actually work on it. Therefore, I present Triton/TritonLang. Triton is the continuation of KLang, a C++-styled programming language that compiles to Lua. I have no ETA on when it will be done as of the moment, but it is work in progress and I would possibly like to get feedback on my current project status. Hello, world! [Pseudocode] #include <io> int main() { io::info("Hello, world!"); return 0; } Advantages to Lua Headers/easily include libraries Statically and dynamically compiled libraries for programs C++-style syntax and easier OOP Helpful Links WIP Documentation GitHub Repository
OETF #14 - Open Hypertext Markup Language
Zen1th posted a topic in OpenEngineering Task ForceOHML is a markup language based on XML, it is a simpler, OC-graphics adapted version of HTML. Why OHML? It all started when i noticed that most network programs/libraries were either DNS system, or Website system. However it is very important to maintain an universal language for webpages. It is the first step of having a stable and universal "OCranet", which will follow with server and client implementations. Protocols, etc.. Document Versions OHML patch versions (1.0.1, 1.0.5, etc.) minor changes (more understandable descriptions, new optional arguments) can be asked in comments section, might get accepted, and when features are froze, set as a new minor version of OHML specifications. OHML minor versions (1.2, 1.1, 1.42) OHML major versions (2, 4, 5) are to be proposed in comments sections and feature froze. Once released they will replace the outdated data in this post. Tags Table about all tags and their (XML) arguments is available in png format, attached to this topic. Examples: Image: <image file="blabla.pic"></image> = "blabla.pic" showen as PIC (MineOS image) format Text: <text>Hello!</text> <text>World</text> Script:  Hyperlink: Show super duper news OHML v1.0.1 revision: Tags can now have optional arguments "x", "y", "width", "height" and "relative" The "relative" argument is for using relative positions, vertical at first, and horizontal at last, we can use "up" (default) or "bottom", put a ";" for splitting, and add the horizental value that can be "left" or "right". Relative positions works that if for example the value is "bottom;right", and if x = -5 and y = -5, the element Y will be at the most bottom point of the page (meaning that bottom for a page with elements not going after 10 for y, the bottom would be 10), added -5, which is equivalent of minus 5, and the element X will be at most-right point (generally viewport width) and will have minus 5. Meaning that for a viewport with size of 80, 25, it would go at 75, 20 OHML v1.0.2 revision: - Added new tag:

, allows to break line in any ohml tags. HREF format An HREF format defined in  tag can be relative or absolute. If a href starts with any supported protocol name followed by "://" (ex: ohtp://), the link is fully absolute and should be coutned as the same than if the user inputed it as a website. It's a normal URI Then, if a href starts with "/", it is relative to the website host (can be ohtp://test.com), so, the full path is: {WEBSITE HOST} + {HREF} Finally, starts with nothing above, it is relative and should be appended to the actual URL URI are in the same format than real ones which is "protocol://host(/page)" OHML, being a markup language, will not support any kind of dynamic coding like <if> statements, <print> statements, etc., dynamic coding is handled by


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As a reporter, I am subject to all manner of hyperbole from corporate executives wishing to put their companies in the best possible light. Which is why I figuratively rolled my eyes when Gerard Kleisterlee, the chairman of the Dutch company, Philips, told me last summer that their work in LED lighting would "change the world."
Lower power consumption, longer life, yes. But change the world in the grand sense? Please.
Based on a project now being introduced in Ghana, Mr. Kleisterlee may be right.
Philips has partnered with KITE, a not-for-profit Ghanaian organization, to bring artificial light to villages that have no electricity.
According to Harriette Amissah-Arthur, KITE's director, only 19 percent of rural areas have electricity. The rest use foul-smelling kerosene lamps to light their huts, which pollute, provide little light and are major fire hazards. In addition, the low light levels makes it difficult to see scorpions and snakes that make their way into people's homes at night.
As in any non-electrified society, life is defined by the sun; little is accomplished once it sets around 6 p.m. she said on the telephone from her office in Accra. And with children helping out with chores during daytime, it leaves little chance for them to study.
Philips developed three different products for the villagers: a solar-powered lantern, a reading light and a wind-up flashlight. The products work because they all use LEDs; their low power consumption means that the lantern charged during the day will light for seven hours. The flashlight's bulb will for all practical purposes never burn out, and the reading light's lower power consumption dramatically reduces the need to change batteries.
The products are costly — at $50 for the lantern, that represents two months' salary for many people. But Ms. Amissah-Arthur hopes to get tax relief from the government, which could cut the price by 40 percent.
KITE is not the only organization attempting to bring light to Africa. Lighting Africa, a World Bank initiative, is also working to bring low-cost illumination to the continent.
There is no doubt, according to Ms. Amissah-Arthur that the Philips initiative is changing peoples' lives. "People can now do things in the evening," she said. "If you could only see the joy these products bring the villagers. You look at their faces; you have to see it to believe it."
By Eric A. Taub
Source: New York Times


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He's the clear favourite to be named Hurler of the Year after a third successive nomination but Tipperary's Seamus Callanan has insisted he can be even better next year.
Thoughts in the Premier County are already turning to how they can push on in 2017 and launch a successful defence of their All-Ireland crown, something they failed to do in 2011 when they last defended the title.
It's good news for a start that Callanan reckons there'll be no retirements and he revealed that those who return next season will have a burning desire to improve.
"I still believe that there are more levels I can get to," said the prolific full-forward, who always believed he could reach the heights he has reached.
"Definitely, I always fully believed. Being an inter-county player is hard, you have a lot of commitments. A lot of hard work goes into it. It's basically a 12 months of the year thing. If you didn't believe you were good enough to do it then you wouldn't stay going year after year.
"I always fully believed there were levels that I could go to."
As for his Tipp colleagues, Callanan said they are a seasoned bunch who won't settle for fleeting success either.
"I think the panel is mature, we have been around long enough, we have seen enough of hurt at this stage, whereas we hadn't seen as much in 2010," said the Drom-Inch man.
"It is a place we don't want to go again. The league fixtures were made last week and just shows how the thing rolls on.
"We are going to be the team that is aimed at. So we will have to get to higher levels again. We can't be going out thinking that the performances of this year will be good enough again next year because they won't be.
"And a lot of other teams will be coming back hungry next year too. Kilkenny will be back hungrier than ever.
"In my mind, they are going to be the benchmark as they have been for years."
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