Successful room temperature ambient-pressure magnetic levitation of LK-99

Post by jliptzin » Fri, Aug 04, 2023, 4:29 AM UTC

marmakoide wrote: post #144

est wrote: post #92

So far lab replication efforts are: Two from HUST: https://www.bilibili.com/video/BV14p4y1V7kS/ https://www.bilibili.com/video/BV13k4y1G7i1/ One by USTC https://www.bilibili.com/video/BV1Ex4y1X7ix/ this tiny sample can stand on its pointy side. One by Qufu Normal University https://www.zhihu.com/zvideo/1669820225079070720 One with THU background but claims a personal project https://www.bilibili.com/video/BV14z4y1s7V…

I guess it's a mix of - It's a good opportunity to gain visibility by working something grabbing the news. 1st room temperature superconductor, that's big - (Under)graduate lab interns can be thrown onto any crash projects at will without much repercussion or resistance, boss is boss and should not be subject to questioning I did a post-doc in China, so that's my sample size N=1 piece of cheap opinion

Post by jchanimal » Fri, Aug 04, 2023, 4:30 AM UTC

TheSpiceIsLife wrote: post #150

someplaceguy wrote: post #141

Earlier quoted context omitted.

It would have been more convincing if you had given real past examples rather than speculative future ones :) Although I'm pretty sure there are plenty that many people can think of, so it doesn't really detract much from your point.

Nuclear weapons. There hasn’t been a full scale war between major powers since.

Post by depereo » Fri, Aug 04, 2023, 4:31 AM UTC

p1mrx wrote: post #186

HeartStrings wrote: post #166

Earlier quoted context omitted.

Is this actually true?

We would first need to build a superconducting track for the hover scooters (containing magnets) to ride on. Assuming we ever figure out how to mass produce the superconductor inexpensively. Perhaps if the track were arranged in a grid-like pattern, the scooter could use superconducting electromagnets to accelerate and steer.

Post by Vecr » Fri, Aug 04, 2023, 4:33 AM UTC

CSMastermind wrote: post #179

xvector wrote: post #143

Earlier quoted context omitted.

I'd go as to far as saying GPT-4 is capable of fairly complex reasoning, at least in my experience tossing complicated questions and situations at ChatGPT Plus.

When I was tutoring people in college for their computer science classes I was struck with how some people could do reasonably well on programming assignments and then when presented with anything even slightly novel would be completely unable to reason their way to a solution. A classic tell of this is people handling out of bounds errors in loops by trying to randomly add or subtract 1 from their for-loop parameter…

Post by SV_BubbleTime » Fri, Aug 04, 2023, 4:35 AM UTC

applied_heat wrote: post #193

voidmain wrote: post #145

Earlier quoted context omitted.

It's apparently hard to measure zero vs extremely low resistance with the two probe setup you are imagining (I guess because the probes and wires aren't superconducting, so most of the resistance in the circuit is not in the sample). The graphs I have seen are all made with a four probe setup [1], where a constant current is run through the outer probe pair and the voltage across the inner pair is measured. If the in…

That’s what he said. You inject a known current and measure the voltage drop across the item you want to measure the resistance of, and then use ohms law