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The first room-temperature ambient-pressure superconductor?
601–610 of 906 posts
Re: The first room-temperature ambient-pressure superconductor?
#602Guys, even if everything in this paper is true, the material as it is might have limited applications. From what they show, the critical field and critical current seem very low. 2500 Oe is like 0.25 Tesla. Even REBCO at 77K is >1T. And 2500 Oe is not even at critical temperature but much lower. From skimming through the article I couldn't find the sample size of the current measurement to get the critical current de…
I'd use it for making my own SQUIDs[1], as a start. There are a number of experiments I want to do, and things I want to understand[2][3], and not having to have cryogenics keeping the detectors cold would be helpful.
I'd also like to use this for antennas, transmission lines, and tuned cavities.[4] There are a lot of things you could do at VLF frequencies[5] that require long, long wires... with lots of resistance, unless you have a defense budget, the resistance eats into efficiency. Superconductors could help deal with that.
[1] https://en.wikipedia.org/wiki/SQUID
[2] https://en.wikipedia.org/wiki/Aharonov%E2%80%93Bohm_effect
[3] https://en.wikipedia.org/wiki/Longitudinal_wave#Electromagne...
[4] https://en.wikipedia.org/wiki/Superconducting_radio_frequenc...
[5] https://en.wikipedia.org/wiki/Very_low_frequency#Amateur_use
Re: The first room-temperature ambient-pressure superconductor?
#603seems it already went thru some peer review here: http://journal.kci.go.kr/jkcgct/archive/articleView?artiId=A...
Published 3 months ago? How are we just hearing about this now?
Re: The first room-temperature ambient-pressure superconductor?
#604Earlier quoted context omitted.
They've just proven (if true of course) that it's possible at all. That is a massive, massive leap. And once it's possible, it won't be long until it's optimized. We've seen this everywhere -- transistors were once huge and now nanometers; solar cells have improved in every where; batteries are cheaper and better than ever.
I was with you on the first part. If this proves room-temperature/ambient-pressure is possible at all, that is huge. Not so sure about the "won't be long until it's optimized," though. There are a lot of examples where something seems perpetually 20 years away. I'd advise tempering the transistor-based optimism with just a skosh of fusion energy skepticism.
To be specific look at how long it has taken cuprate superconductors to find practical applications
https://en.wikipedia.org/wiki/Cuprate_superconductor
This was something that people said would change the world when I was in high school and it really hasn't. (For that matter, the fundamental physics is still not very well understood)
Re: The first room-temperature ambient-pressure superconductor?
#605Earlier quoted context omitted.
As long as you only want them to hover over a magnet...
I want them to have enough current passing through them in a rod shape that it will run the current against the Earth's magnetic field to cause vertical movement.
This gave me a giggle to think about - mind expanding on what you’re thinking of using movement scenario for?
Re: The first room-temperature ambient-pressure superconductor?
#606The graphs on page 3 are exactly what you would expect with a real superconductor. The current/voltage/temp relationship especially. In fact I don't see how you get graphs that look like that unless you either created a superconductor or are just blatantly making up the data. This could be enormous.
My first thought was “I really hope this is real and not someone having left the data collection software in simulation mode.” If this reproduces, it’s historic. If it doesn’t, it’s either cold fusion or faster-than-light neutrinos.
If this pans out, this is some 2044 Nobel Prize stuff
Re: The first room-temperature ambient-pressure superconductor?
#607Earlier quoted context omitted.
Superconductivity is not enough for a cpu that doesn't generate heat, you would need a cpu built of reversible logic gate. Thermodynamics requires that when you destroy a bit of information you generate at least 2.9×10−21 J. It's the Landauer's principle.
My understanding is that modern CMOS circuits dissipate around 1 pJ (10^-12) per bit, so even if we are limited by the Landauer's principle, it would still be a 9 orders of magnitude improvement. I would surely love a CPU that uses microwatts instead of hundreds of watts.
I apologize, I couldn't not resist to the occasion of being technically correct. I should also have stated that a superconductors based CPU would be incredibly cool figuratively and physically!
Re: The first room-temperature ambient-pressure superconductor?
#608Guys, even if everything in this paper is true, the material as it is might have limited applications. From what they show, the critical field and critical current seem very low. 2500 Oe is like 0.25 Tesla. Even REBCO at 77K is >1T. And 2500 Oe is not even at critical temperature but much lower. From skimming through the article I couldn't find the sample size of the current measurement to get the critical current de…
> it would be super cool
It would be super room temperature
Re: The first room-temperature ambient-pressure superconductor?
#609Earlier quoted context omitted.
> I assume the energy lost as heat occurs due to the "current" going into the and gate having "nowhere else to go" other than to dissapate as heat? Not quite, it's a thermodynamic principle that applies to any way you could possibly compute AND. Basically, the laws of physics are reversible, so your computation must be reversible too. There are 4 possible inputs to an AND gate, so to be reversible there must be 4 pos…
I think we're talking about the same thing, but I explained it absolutely terribly. If we "dump the other output" back into the power source, such as the battery, does that solve the problem of not implicitly dumping it into the environment? Or is it still destroying information?
I think that you could move those bits to destroy them somewhere else but what I got from pezezin post is that there are many order of improvement to achieve before that loss becomes significant enough to warrant the incredible complexity of shipping wasted bits to the heat sink.
Re: The first room-temperature ambient-pressure superconductor?
#610Earlier quoted context omitted.
My first thought was “I really hope this is real and not someone having left the data collection software in simulation mode.” If this reproduces, it’s historic. If it doesn’t, it’s either cold fusion or faster-than-light neutrinos.
If this pans out, this is some 2044 Nobel Prize stuff
If reproduced, it could be the 2023 Nobel (see the high Tc prize. Announced in March, awarded in October).
Verification can be very easy for this particular phenomenon.