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Electronic Structure of LK-99

arxiv.org

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Re: Electronic Structure of LK-99

#341

Post by r2_pilot »

yetihehe wrote: post #287
xorbax wrote: post #286

Earlier quoted context omitted.

I think I'd ask you what I'd ask L/K - why do you think it works? They're experimentalists: they didn't find the material from first principles, they appear to have made it and decided to continue. So did you make the engine and notice it's efficiency, or did you find it using first principles where no one else did?

> So did you make the engine and notice it's efficiency, or did you find it using first principles where no one else did? I found it from first principles, I still don't know why no one else thought about it, but it requires sort of splitting and reversing a normal stirling engine inside-out. Since then I've found several attempts at going in that directions which I took, but no one connected all those pieces yet as…

I suggest designing it in CAD and possibly sending it to be metal 3d-printed, which would be cheaper than a whole garage(I feel your pain on not having space... my carport is currently saturated with my business's equipment and I'd really like to build a proper workshop). In addition to less metal shavings around, you'll have access to different geometry which may help your design.

Re: Electronic Structure of LK-99

#342

Post by kuschku »

itsoktocry wrote: post #318
xvector wrote: post #213

Earlier quoted context omitted.

Impact of superconductors: https://threadreaderapp.com/thread/1685088625187495936.html

"1970: Superconducting trains to go from New York to LA in 20 minutes!" 50+ years later the US has how many high speed trains, of any kind?

Well, Shanghai has some, Japan is building some, and if this discovery is real, Germany might as well revive their Transrapid project (which built the shanghai one).

Re: Electronic Structure of LK-99

#343

Post by stabbles »

montecarl wrote: post #224
NotSuspicious wrote: post #72

One of the things that has most pissed me off about these papers is that VASP is proprietary and requires a license to use.

Some context on VASP from someone who worked with it for about 10 years. VASP is a very common projector augmented wave (PAW) planewave DFT program in the solid state physics/chemistry community. I used it for about 10 years when I was doing computational chemistry. It is distributed as a tarball of FORTRAN90 files, so in some sense all researchers that use it have access to the source code. The research group I was…

How about Quantum Espresso [1] and CP2K [2]? They're both open source

[1] https://www.quantum-espresso.org/ [2] https://www.cp2k.org/

Re: Electronic Structure of LK-99

#344

Post by evergreener »

samhuk wrote: post #282

My ultimate take-away about LK-99 since the start has been that, even if it doesn't turn out to be a holy-grail or whatever, the novel ideas behind the material are incredibly interesting. The idea of causing tiny (~0.5%) crystal lattice shrinkage with cuprate percolation is a really interesting idea. So far, only huge pressures or very low temperatures (i.e. Physics) have been used to cause that shrinkage, therefore…

Is there an intuitive explanation of why shrinkage of a material is beneficial for superconductivity. Naive question, particles physicist by training.

Re: Electronic Structure of LK-99

#345

Post by swat535 »

throwawaylinux wrote: post #218
jacquesm wrote: post #209

Earlier quoted context omitted.

Jeffbee in the 1947 edition: The most interesting phenomenon revealed so far is that the solid state electronics people and the rocket fanatics people draw on the same limited global pool of credulity, such that TinkererNews cannot be flooded with both transistor worship and moon travel speculation at the same time. Seriously: if it doesn't interest you, you could simply refrain from commenting and even reading. This…

Despite the the "strictly no jesting on the super serious hacker news" rule, I think it was just a joke. I wouldn't let it get to you too much. I thought it was pretty funny.

Honestly I don’t find those kind of comments particularly valuable on HN. It derails the topic from a meaningful discussion and the whole thing devolves into a Reddit troll fest. All you need to do is glimpse at the replies it spawned to confirm it. This is why I assume it was heavily downvoted.

Re: Electronic Structure of LK-99

#346

Post by coldpie »

DoreenMichele wrote: post #55
mrleinad wrote: post #51

Earlier quoted context omitted.

Next is that UFOs are real

Unidentified Flying Objects are absolutely real, though the newer cool kid term is UAP. (From the internet: UAP stands for "unidentified anomalous phenomena." ) It's flying saucers carrying aliens from another planet that's controversial and up for debate.

> It's flying saucers carrying aliens from another planet that's controversial and up for debate.

No, it isn't. There's some people out there stuck down in a conspiracy hole, but there is no real debate.

Re: Electronic Structure of LK-99

#347

Post by deelowe »

PuffinBlue wrote: post #306
feoren wrote: post #276

Earlier quoted context omitted.

From my perspective, LK-99 is by far the most likely to be an actual serious technological breakthrough. If it's real, it would be a breakthrough on the level of the discovery of electricity, the lens, the transistor, or the laser. One of those era-defining bottlenecks in the Civilization technology tree. GPT-4 is a nice iterative improvement over previous work, and a culmination of decades of research. It's not anyw…

Regarding fusion - have you seen Helion’s approach? [0] It seems their approach removes many of the issues with Tokamak or Laser Pulsed fusion. It also reduces most of the feedstock issues with the two part fuel breeding approach. Their approach seems easier to be optimistic about. [0] https://youtu.be/_bDXXWQxK38

https://www.youtube.com/watch?v=3vUPhsFoniw

Be careful with real engineering. Many speculate he's doing paid content between this and spinlaunch.

Re: Electronic Structure of LK-99

#348

Post by hgomersall »

Valgrim wrote: post #75
SamPatt wrote: post #47

Earlier quoted context omitted.

The least interesting phenomenon revealed so far is that HN is split into a group who are entertained by watching and discussing emerging tech / science news, and a second group who are entertained by disparaging the first. I enjoy watching floating rocks and talking to computers.

Same with me, it gives me the same feeling of "Living in a science fiction world" that I once felt when cell phones or Google maps came out. Of course even tough I still use both profusely every day, the feeling of novelty wore out. I expect the same will happen with this.

I spent most of my youth through the 80s and 90s thinking technology was a bit shit. Computers worked until they ground to a halt with lots of whirring and crunching; we had enormous flat TVs that had terrible pictures; you could store an album of music just about if you jumped through annoying hoops to write it to a disc; MP3 appeared and disappointed because flash memory was limited to 16MB at a sensible price... Then slowly but surely the future happened, until it was suddenly apparent that technology was now outstripping our imagination in many areas. The problem we have now is that society is way behind where it needs to be to make proper use of the tech we have, whilst other areas are woefully underserved by tech at all. We simultaneously have an abundance of tech and not enough engineers to roll it out (whilst struggling with the societal implications of some aspects). Exciting times indeed.

Re: Electronic Structure of LK-99

#350

Post by pests »

pjc50 wrote: post #292
vesinisa wrote: post #26

Earlier quoted context omitted.

Just curious, how did you find Covid "exciting"? Making lots of money on the bear market?

mRNA vaccines are a huge discovery, not quite as powerful as room temperature superconductors but still up there in terms of impact on humanity. And encountered a very different kind of skepticism while ultimately turning out to be not only real but widely deployed with great speed.

Haven't mRNA vaccines been in development for over a decade though?
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