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Is there any physics theory that depicts our universe as $2+1$ dimensional?
I heard that black holes seem to suggest that the world might be $2+1$ dimensional, so I am curious whether such theory exists?
Just for curiosity.
Is there any physics theory that depicts our universe as $2+1$ dimensional?
I heard that black holes seem to suggest that the world might be $2+1$ dimensional, so I am curious whether such theory exists?
Just for curiosity.
You've probably come across the holographic principle: see http://en.wikipedia.org/wiki/Holographic_principle for details.
The idea is that because the entropy of a black hole is proportional to the area of the event horizon, this means all the information about the black hole is present on the event horizon, and this has dimension 2+1D. However I don't think this should be taken to mean that our universe is 2+1 dimensional.
Having said that, there are ideas from the more fringe areas of physics that at a very small scale/high energy the universe may be 1+1 dimensional. For example causal dynamical triangulation (http://en.wikipedia.org/wiki/Causal_dynamical_triangulation) seems to show 2D behaviour at very small scales.
There is an idea from string theory called the AdS/CFT correspondence (http://en.wikipedia.org/wiki/AdS/CFT_correspondence) that physics in an n dimensional gravity theory can be encoded by a n-1 dimensional bounding surface. However this doesn't mean our world is 2+1D, but rather that our physics can be represented by a theory in 4+1D.
I personally haven't heard of one, but then again I haven't heard much.
First thing, are you sure that it's two you want? Or four? Because by relativity et al, our universe is 4D. Go into string theory, it becomes 10/11/26 D.
I think you may have misinterpreted the rubber-sheet explanation of gravity in general relativity as a theory. The 2D rubber sheet is only a way for us to imagine gravity acting, since it bends space. We can easily imagine a 2D sheet bending into the third dimension, as we live in a 3D world (3 macroscopic spatial dimensions, ti be exact). What's actually happening; a 3D bit of space bending into the fourth dimension, is not that easy to imagine. Possibly impossible to imagine. So the 2D-rubber-sheet-and-rock is just a visual aid.
On a side note, the reason I doubt that there is any such theory is this:


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All Aboard! Last call for the Black River Western. This vintage train is used for tours now.
It's said that in mid to late September, from September 15-28, a deadly comet will hit this very earth and destroy it. I'm here to tell you, that it won't happen, I won't let it happen. I will fly up into the atmosphere and stop it from hitting us. The comet was as prophesied on Youtube just a few months ago, when you look up at the sky and see nothing at all, you'll know it was really me, the one that saved us all. While we wait for this comet to come, feel free to browse my art and decorate your home to celebrate your life. Your Welcome. http://www.MikeSavad.com My name is Mike Savad, I create one of a kind creations. Photo realistic is what people think of first. There are many themes, flowers, porches, and local...
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subset: commoncrawl


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For as long as there is limited overs cricket - of ten, twenty or fifty overs - there will remain the Sri Lankan spinners' mid-innings choke
I think South Africa is going to destroy the weak Pakistani bating lind up.. their batsmans have struggled throughout the tournment.. Facing such a strong bowling line up of South Africa.. i don't think they could win..so my money is on South Africa..
Trent Bridge again for South Africa and with Pak's spin they could be in trouble.
Anyone know the odds on the Sf/Pak game?
None of the books I use have it listed yet.
south africa or west indies should lift the cup.
I hate to see it in the hands of the pakis or the lankans. they dont deserve it
Can't see us making it past SA. Even with the choke factor. Our batting is sure to crumble even if our bowling gives us a chance.
Forever 63* at the SCG
Winner of the 4th Cricket Web Battrick Cup
SL and WI both making it makes our two losses look slightly less awful I suppose.
WWCC - Loyaulte Mi Lie
"People make me happy.. not places.. people"
"When a man is tired of London, he is tired of life." - Samuel Johnson
"Hope is the fuel of progress and fear is the prison in which you put yourself" - Tony Benn
#408. Sixty three not out forever.
Hope SL pick Maharoof for the semi. We might have a chance of getting a boundary or two if he bats in the last 5 overs.
they haven't sort out their bating yet.. their two main batsmans Malik and Misbah are out of form.. South Africa's bowling line up and fielding has been the best in this tournment.. they managed to defend their lowest total in the world cup and if they perform like that.. Pakistan's weak batting will colapes under 100 runs..
My favorite teams are West Indies, Sri Lanka and Pakistan.. but i don't think any of them are as good as South Africa.. so as much as i like any of those teams to win it.. but South Africa has the most chance..
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Sunday, November 02, 2003COLUMBIA, S.C. (November 2, 2003) - The Buccaneer women's tennis team concluded play at the 2003 Southern Intercollegiate Tournament hosted by the University of South Carolina Sunday. East Tennessee State women's tennis team finished first in one doubles flight and third in another. Buccaneer doubles team of Mariya Ilyina (Kyiv, Ukraine) and Sylwia Ziolkowska (Warsaw, Poland) defeated the pair of Aguilar and Nezerok of Armstrong Atlantic University 8-4 to win the B2 doubles flight. The pair of Jewel Aldea (Charleston, S.C.) and Courtney McInnis (Waterboro, Maine) also won their final doubles match of the tournament to take third place. In singles competition, the Buccaneers won two of their seven backdraws matches. This marks the end of fall tournament action for the women's tennis team. "Overall, we played well in this tournament, and it was a good end to the fall tournament season," said head coach Steve Brooks. The Buccaneers will now begin preparing for their regular season which begins with the VCU quad tournament January 31 and February 1. Sunday's Results Singles A1 - Sylwia Ziolkowska (ETSU) def. Lindsey Hess (UNC - Wilmington) 0-6, 6-3, 6-2 A2 - Rogers def. Jewel Aldea (ETSU) 6-2, 6-1 B1 - Mariya Ilyina (ETSU) def. Koulechova w/d B2 - Koon def. Courtney McInnis (ETSU) 6-4, 6-2 C1 - Popac def. Gemma Halim (ETSU) 6-4, 6-3 C2 - Bankhead def. Aimee Villavicincia (ETSU) 7-6 (3), 7-5 C3 - Wilson def. Shelly Van Clare (ETSU) 6-2, 6-1 Doubles B2 - Ilyina/Ziolkowska (ETSU) def. Alejandra Aguilar/Nezerok (Armstrong Atlantic) 8-4 C1 - Halim/Villaviacencio (ETSU) def. Turner/Whisenhunt (Wofford) w/d C2 - Aldea/McInnis (ETSU) def. Clark/Morris (UNCC) 8-4
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Test drive our new responsive website, which will go live on Tuesday, Sept 8th
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updated February, 2013


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Bullfrogs and Buddies in North Kansas City
On September 21, I traveled with Buddy Bison kids from Winnwood Elementary School in North Kansas City, Missouri to Smithville Lake. U.S. Army Corps Ranger Jim taught the kids about the purpose of the lake as a recreation area, a water source, and a wildlife habitat.
We went on a hike and got to see some of the amphibians that live around the lake. The kids even touched a real-life bull frog! The best part about places like Smithville Lake is that they give everyone the opportunity to get away from the city and back to nature.


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Overview:The TL891 automated tape mini-library provides a low-cost high-performance reliable entry-level automated mass storage for departmental data management applications. It uses high-performance TZ89 tape drives for unsurpassed data integrity and high capacity. ??This product is ideal for data applications for DIGITAL systems platforms clusters an networks. The TL981 mini-library is supported via DIGITAL Storage Management software or third party application software on DIGITAL Alpha systems running DIGITAL UNIX Open VMS or Windows NT operating systems and VAX systems running Open VMS.
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Form Factor5.25" x 1H
PlatformPC, Unix
Dimensions(HxWxD)6.97 in x 17.02 in x 23.8 in
Weight48.51 lbs


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I like this idea: it's a iGoogle widget that keeps track of number of the days since you have performed some task. You enter the name of the task and it keeps Track of the time automatically.
I do not use iGoogle, and I don't want to start. Why not create an Autohotkey equivalent?
Hopefully the program will not take up too much processing power and memory.
Thanks! -Spanky


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"grandma's gift from me"
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Comments: My grandmother recently bought a coffee table and invited the family over to try it out. Considering that she is very delicate with her furniture, I ordered a mirrored glass coasters with her name engraved. When the day came, I presented the gift to her. She fell in love with them! ..and right away put the coasters to use . Thank you memorable gifts!


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By Frank MulliganMore Content NowThere are subtle indications that your perspective on Christmas may be Grinch-like. For instance, do you steadfastly maintain that elves are illegal immigrants?Other hints that your heart is Grinchily tiny when it comes to the Christmas season include the following:� You call the fire deptartment on people roasting chestnuts on an open fire.� Likewise on those decking the halls with boughs of holly � clearly a potential fire hazard.
Bloomberg News
The Delaware Department of Correction is currently conducting an emergency operations drill at the James T. Vaughn Correctional Center in
PREVIOUSLY REPORTED The Smyrna and Clayton Police departments announced in October the re-launch of the community...
The unprecedented hack of Sony Pictures which a U.S. official says is linked to North Korea may be the most damaging cyberattack ever inflicted on an American business.
U.S. officials are blaming North Korea for the�hack into Sony Pictures...
Uh oh! There it goes again -- that cabinet door that always bangs annoyingly or the almost-impossible-to-open drawer from Hell.
- Events Calendar


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The only names on this list are those that ring a bell with me. Thousands of people who were notable in their fields of endeavor, but unknown to me, have been excluded.
Dave Granlund cartoon about Christmas season.
Is there a room in your home that you tend to avoid? Chances are it's lacking in sufficient natural light. A dark room tends to...
Stephen Collins�has admitted to�
Former tennis pro�Martina Navratilova�married her longtime girlfriend, Russian model Julia...
Chicago Bears coach Marc Trestman ran through the faults he saw in his team during its latest loss and it sure sounded familiar.
By Laura Firszt, Networx
Starz has renewed the Golden Globe-nominated series�The Missing�for a second season, the network...
Five ways you can have fun this weekend:
- Events Calendar


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Anna Fenninger produced a measured performance to take second place in the opening Super G of the season. This was the HEAD World Cup Rebel's tenth World Cup podium in Super G in her career. With Lara Gut leading in the finish, Fenninger held her own against the time of the Swiss racer on her run. At the finish she had to settle for second with Niki Hosp in third after Lizz Goergl was disqualified after having been in second.
Fenninger is benefitting from the hard work that was put in during the summer by both herself and the development team. From three races on the World Cup she has now taken three top five results, this being the best to date. "It's getting better, but of course I'm happy," she explained after the race.
Fenninger had the fastest splits of all the racers at the top of the course. Despite starting at the back of the top seeds, when earlier start numbers had the better of the course, this was a great performance by Fenninger. "For now, I believe I am stronger in super g races than I am in downhill", she said. "In yesterday's downhill race I made too many mistakes. I managed to ski better today especially in the upper part. Unfortunately I lost speed and time in the bottom part. But overall being on the podium is a really good feeling."
With the Raptor course proving to be a gnarly and exciting yet turny course for its first public outing, clean lines and smooth runs were the name of the game. Fenninger used all her Giant Slalom skills to gain maximum benefit through the turny section of the course before the long gliding section into the finish.
Maria Hoefl-Riesch added another top ten result to her results list with eighth place while Ramona Siebenhofer produced a great performance to score her first World Cup points in Super G with 22nd from a start number of 35.
In the race for the Overall, Anna Fenninger is now in second spot after four races with Maria Hoefl-Riesch in third. Lara gut leads at the moment.
Next up is the Giant Slalom!
1. Lara Gut (SUI)
2. Anna Fenninger (AUT) HEAD
3. Niki Hosp (AUT)
8. Maria Hoefl-Riesch (GER) HEAD
22. Ramona Siebenhofer (AUT) HEAD
29. Julia Mancuso (USA) HEAD


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Basically, to perform reflow soldering, solder paste is placed on a printed circuit board, and the components to be soldered is placed on top of the solder paste. When the oven heats the solder paste past the melting temperature, the solder paste melts and solders the component to the circuit board.
To control the oven's temperature, I created my own reflow toaster oven controller circuit. This circuit uses an ATmega32U4 microcontroller to monitor the oven's temperature using a thermocouple and AD595AQ, and then control the oven's heating element using a solid state relay. The controller features USB logging/debugging, USB bootloading, a graphic LCD display, and 3 buttons. The firmware features tweaking for all settings, manual temperature control, manual heating element control, and automatic temperature profile control (with a nice temperature history graph display). This circuit will plug into a wall outlet, and the oven will plug into this circuit, while the solid state relay basically acts as a switch between the wall outlet and the oven's heating element. Safety is the main design objective (but some things were limited by cost), and ease of use is the second objective.
Here is a demonstration video:
Some more key features:
- The thermocouple is rated to over 500 degrees Celcius. Soldering using my solder paste requires only up to maybe 250 degrees Celcius.
- The solid state relay is used because they can provide better control than mechanical relays, and they are more reliable. Mechanical relays can wear out because of their mechanical nature, and from internal sparks that occur during switching. I plan on switching the relay at 1 Hz, so this is important.
- The relay is rated for 240V and 25A so it should work with any typical toaster oven in any part of the world. The relay is cooled with a custom made aluminum heat sink and a small cooling fan.
- Everything on this circuit is powered from the wall outlet because I'm using a tiny USB charger as a built-in AC-to-DC converter. This is good since one cable powers everything. A computer is not required to operate it.
- A plastic cover is created to protect the circuit from things touching it accidentally. I can safely handle the circuit without getting shocked.
Included here (see bottom of this step) are all of the project files. This package contains the CadSoft EAGLE 5.11 schematic and PCB files, the PCB gerber files, the source code for the microcontroller firmware (including the bootloader), and some mechanical drawings for the heat sink and plastic shielding.
Great project! Thanks for publishing this project.
What USA product do you recommend to program the Atmega32U4-AU ? I will be using Debian linux.
arduino is really no different than a programmer. programmers run 40-80 $ or cheaper if you get a clone off ebay like me. it just takes some patience. the chip can be easily had from a supplier. I buy tons of atmel products so i just requested a sample so i can work with this. the 1284p is very similar to this chip and can be easily bootloaded (comes in dip 40). adapting the chip takes only a little extra time rearranging the connections.
also forgot to mention that the author mentioned using an atmel328p in place of the atmega32u4
Why every single tutorials here does NOT use Arduino as a controller for the oven? They all seem to be using customized circuits and non-Arduino-compatible chips (or those things I cannot program easily). Of course this tutorial is great, and I liked it!
(but I sadly cannot make one because I don't have access to the chip and cannot solder SMD parts with any of available methods without burning either my hand, the board, the chip or nearby components)
I need to get the code working for Arduino (Mega, UNO, Nano...) so I can reflow solder on my board without burning the chip or toasting the board.
p.s. If you can help me, can I get some help? (Sadly due to bad English my words can sound harsh. I really appologize)
This is what I need (don't mind the components; just make the code possible to work under UNO):
1. Switch between modes (lead paste and no-Pb paste)
2. When temperature doesn't go up or down (in 40 seconds), or if the door is opened, sound alarm (safety is a must)
3. Overcooking prevention
4. Timer function
5. Emergency shutdown button (cancels off any remaining job)
6. Warn user for inside temperature (because hot things and hands doesn't play nicely)
p.p.s. I don't know why but my FTDI USB ISP programmer does never initialize anything correctly and ends up throwing "arvdude: device not ready".
Like the foil on the inside of the window looking in to the toaster oven.
It would be nice to have a bluetooth interface and program from an android device.
Kapton stencils here in 24 hrs for only $50.00 going down to 0.8mm pitch.
Hello mate, thanks for this your great project. Well done!!! I've buid a copy and struggling with one thing I can't get Manual temp mode working. I set any temterature and see PWM 65535/65535 but relay doesn't switch the heating element. Please note that auto mode and manual PWM mode works pretty well so relay wiring and heating element is ok. Any idea anybody?
Already sorted out. If someone of you experiences such issue there is possible solution:
It seems that "heat_set(cur_pwm);" is missing in the "void menu_manual_temp_ctrl()" part of "menus.c" => this causes that this particular part of the code works fine and calculates required PWM value but it actually doesn't say to heater hey mate turn on and this is your pwm value. Instead of this calculated cur_pwm is used just for writing on display.
Another issue I experienced is that when you are cooling down in final phase of auto curve too slowly (slower that expected temperature calculated using cooling step per sec set in the presets and time) you can pretty easily get this expected temperature value to negative numbers which causes that heater element is turned on even if you are actually trying to cool down.
I think I found a solution as well (not yet tried as I'm already off my workshop)
There is a upper limit to the duty cycle to avoid accidentally heating instead of cooling as a part of "RaflowToasterOven.c" but probably accidently this part of the code is commented.
I'll remove \\ from the beginning of the line and compile all the code again. Hopefully it will resolve this issue.
What about the reset line?
Also, what SPI speed are you using? It needs to be about 125 KHz until you write all the fuses.
For the controllers for your home oven there is one quite interesting in www.nelectronics.org. There are others also from drotek, www.drotek.fr.
I stumbled upon this post because I was using the AD595 for another application and was surprised by the degenerate square wave output. It turns out that the square wave disappears when you ground the positive terminal of the thermocouple. This may sound strange, but you can see the connection if you look closely at figure 1 in the AD595 Datasheet.
The only reason I know about this trick is because I'm building a controller for a Western Electric 1D2 pay phone and it requires 5VDC for the logic and 130VDC for the coin relay.
it'll look kind of ugly though
it doesn't help heat dissipation to the outside of the oven that much, if at all, so it's a net benefit.
In the end, it does help the oven heat faster, but the oven also cools slower. opening the oven door slightly will help it cool faster so that's not a problem
BTW, I am trying to repurpose 2 small appliances. I have a working coffee maker and a working toaster oven (both replaced with newer gifts). I like your project, but It's really not that useful for my needs. Just out of curiosity, do you have any other suggestions for reusing these appliances (or just taking out useful parts)?
If I can't come up with anything, I will donate them to either the Salvation Army or someone who wants them (and is willing to pay for shipping) - I posted this in the Q & A section the other day.
Would love to hear your ideas/feedback if you have any to share.
I can't really come up with any other projects with those things, if they are working, personally I would just keep using them, or donate them. Just don't trash them.
and sorry i try to speck ingles thank's
In your schematic I see the signals SCL and SDA on the cable connector and the processor. Do they go anywhere else? I'm asking because I can't find the pull-up resistors that are specified in the LCD and ATMEGA data sheets. If they aren't hiding on the page somewhere (this is why I really dislike 'disjoint' schematics), their absence may be why your I2C runs slowly.
My code activates the internal pull-up resistors of the ATmega, but maybe that is not enough? It's worked for other projects flawlessly before though.
Googling around suggests that internal pull-ups are generally too weak for high speed operation: http://wiki.nycresistor.com/wiki/Using_the_TWI/I2C_interface


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