Actually, we don't know if there's exactly zero resistance, or just a resistance so low that it's below our detection limit in experiments. Thinking superconductivity as a BEC for electron pairs would probably lead to zero resistance, but I'm not an expert on those matters.
1.9 K is used because the superconductors can withstand a higher magnetic field (that is required in the system) at that temperature than at 4.2 K.
HTC technology is not available yet for applications like this. They are using conventional Sn3Ti (and NbTi to some extent) superconductors.
I'm not sure how the Wikipedia quote is relevant here. Although the wires in LHC are made of LTS materials, the materials still are type II superconductors.
The main reason to have large cooling capacity is a phenomenon called "quenching". The wires in the coils are actually made of really thin filaments of superconducting material inside a copper matrix. These filaments can (and do) go out of superconducting state because of a local problem, and at this small point there's naturally high ohmic heating. If the system can't respond quickly enough to lower the local temperature so that the superconducting state is restored, this point of normal state will start to spread at a high speed, causing more heating and boiling off the coolant quite expensively. So this is the reason why you need large cooling capacity and thermal conductivity.
For example:
[...] a problem that we have today, and that is the fact that every PC should have a decent graphics card. Why would a computer meant for browsing the Internet and reading email need a separate graphics card?
Stephane Rodrigues comments:
"I first gave a cursory look at BIFF. 1) Missing records: examples are 0x00EF and 0x01BA, just off the top of my head. 2) No specification: example is the OBJ record for a Forms Combobox," Rodriguez wrote. "Then I gave a cursory look at the Office Drawing specs. And, again, just a cursory look at it showed unspecified records." http://www.zdnet.com.au/news/software/soa/Microsoft-publishes-incomplete-OOXML-specs/0,130061733,339286057,00.htm
Without RTFA, I first thought he was talking about similar metallic taste than reported for example by the Russian "volunteers" clearing Chernobyl in 1986, as there's surely enough ionizing stuff out there (see for example the several astronaut reports of bright flashes during EVA, which are attributed to certain particles hitting the eye). However it seems that this case is about something much less interesting:(
Actually it's pretty simple to diagnose. The usual procedure for with non-POSTing computers is:
1. Unplug all the drives and generally strip the comp naked till you have only PSU, motherboard, CPU and its cooler connected. 2. Try to boot, you should get missing RAM error beep. 3. a) If absolutely nothing happens (fans don't spin etc), unplug power button wires and try to start the comp with a screw driver (eliminates faulty power switch on the case). If still nothing happens, most likely either the PSU or the mobo is dead. In this case the system should be tested outside the case, if there's a (rare) earthing problem with case.
b) If there are no error beeps, the PSU or the motherboard is likely faulty. This condition can happen when the CPU is dead or the cooler is uninstalled improperly (common sympton on Core 2 Duo systems), all these things can be quite easily checked if you have some spares available. Usually it's sensible to start with another PSU, as that's the most common culprit.
c) There's a missing RAM error. Try booting with one stick installed, if it now boots (or gives a missing graphics card error) try adding another stick (if there are more than one in the system), or proceed to step 4. If the comp won't boot with a stick of RAM in any of the slots, testing with a known good stick of RAM will resolve whether the original RAM or the mobo (or its RAM slots) are faulty.
4. Add the graphics card (if there's one). If it won't boot, the card is faulty. If it boots, start adding the rest of the components one by one, until the comp wont POST.
This simple sequence has worked for me every time (FYI, I keep a small labs worth of mainly old hardware running, although I have no formal training in the area).
Slashdot Mirror
Actually, we don't know if there's exactly zero resistance, or just a resistance so low that it's below our detection limit in experiments. Thinking superconductivity as a BEC for electron pairs would probably lead to zero resistance, but I'm not an expert on those matters.
1.9 K is used because the superconductors can withstand a higher magnetic field (that is required in the system) at that temperature than at 4.2 K.
HTC technology is not available yet for applications like this. They are using conventional Sn3Ti (and NbTi to some extent) superconductors. I'm not sure how the Wikipedia quote is relevant here. Although the wires in LHC are made of LTS materials, the materials still are type II superconductors. The main reason to have large cooling capacity is a phenomenon called "quenching". The wires in the coils are actually made of really thin filaments of superconducting material inside a copper matrix. These filaments can (and do) go out of superconducting state because of a local problem, and at this small point there's naturally high ohmic heating. If the system can't respond quickly enough to lower the local temperature so that the superconducting state is restored, this point of normal state will start to spread at a high speed, causing more heating and boiling off the coolant quite expensively. So this is the reason why you need large cooling capacity and thermal conductivity.
Here you go: http://www.ebuyer.com/product/114048
If a person is looking for an OS on Best Buy, she/he very likely has a clue on how to install it too.
Add speech-to-text to that.
Antineutron consists of 2 anti-down and 1 anti-up quarks.
Thanks to me, mollie II, with a blazing score of over 112, and I don't even speak the language :)
An arm and a leg, unofficial sources suggest.
$100k? How can you expect anyone to live on that? Where's the union when you need it the most?
Isn't that just called "marketing"?
Because you can doesn't mean that the average gamer can.
Maybe because it's pretty hard to share a computer, whereas you can play for example a racing game on shared screen with a console.
If the computer is not used for gaming, do you think the user would suddenly start buying games if there was a separate graphics in the computer?
Without RTFA, I first thought he was talking about similar metallic taste than reported for example by the Russian "volunteers" clearing Chernobyl in 1986, as there's surely enough ionizing stuff out there (see for example the several astronaut reports of bright flashes during EVA, which are attributed to certain particles hitting the eye). However it seems that this case is about something much less interesting :(
Actually it's pretty simple to diagnose. The usual procedure for with non-POSTing computers is:
1. Unplug all the drives and generally strip the comp naked till you have only PSU, motherboard, CPU and its cooler connected.
2. Try to boot, you should get missing RAM error beep.
3.
a) If absolutely nothing happens (fans don't spin etc), unplug power button wires and try to start the comp with a screw driver (eliminates faulty power switch on the case). If still nothing happens, most likely either the PSU or the mobo is dead. In this case the system should be tested outside the case, if there's a (rare) earthing problem with case.
b) If there are no error beeps, the PSU or the motherboard is likely faulty. This condition can happen when the CPU is dead or the cooler is uninstalled improperly (common sympton on Core 2 Duo systems), all these things can be quite easily checked if you have some spares available. Usually it's sensible to start with another PSU, as that's the most common culprit.
c) There's a missing RAM error. Try booting with one stick installed, if it now boots (or gives a missing graphics card error) try adding another stick (if there are more than one in the system), or proceed to step 4. If the comp won't boot with a stick of RAM in any of the slots, testing with a known good stick of RAM will resolve whether the original RAM or the mobo (or its RAM slots) are faulty.
4. Add the graphics card (if there's one). If it won't boot, the card is faulty. If it boots, start adding the rest of the components one by one, until the comp wont POST.
This simple sequence has worked for me every time (FYI, I keep a small labs worth of mainly old hardware running, although I have no formal training in the area).