201–209 of 209 posts
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As someone familiar with DFT, that is arbitrage opportunity:)
Do it! Put your money where your mouth is and get ez $ (and help shape a more accurate estimate!)
e: oh wow holy crap manifold has a lot more liquidity than when I last checked in, sold for an easy profit now that I think it has returned to a more reasonable probability
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Does anyone know if there's a way to ensure those "particular Cu substitutions" happen at the correct atomic sites? Or I guess what's the way forward in terms of synthesizing
If you figure out how to ensure it gets dropped at the higher energy subsitution site, you would get a nobel prize as well.
Man, I'm feeling stronger about LK-99 being it. This paper is theoretical and she finds that particular Cu substitutions onto specific Pb atomic sites are key to enabling a band structure that is usually linked to high Tc superconductors. What this means for the more practical minded is that the synthesis of superconducting LK-99 is not trivial and you need to make the appropriate substitutional alloy for this to wor…
If this could be simulated, can you help me understand why we couldn't have used simulation to find promising SC materials to investigate further earlier? Are there just too many permutations to investigate? It seems to my own naive self that if LK99 is the real deal, we mostly just got lucky finding it.
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Can anyone explain what this means in relation to the ability to synthesize it in superconducting form? Is there a way to force the Cu to the correct site? Or is looking for a new material with similar properties the way forward
I’m currently in a Twitter space with some accounts who know more about this process and this question was answered a few minutes ago. To summarize: no one has yet found a way to “steer” which sites get Cu and which ones don’t. This paper simultaneously makes LK-99 look like the real deal but also points out there may be more, or much more work, to reliably direct the replacement. Someone in the space said “if you fi…
Better yet, do something like a microwave oven tuned to Lead’s resonant frequency to encourage all the sites to be in the higher energy state as the crystal structure is forming.
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There are linear scaling DFT codes but they’re not available under open source licensing, only a strange license: https://onetep.org/
What the fuck? Linear scaling DFT is something way more impactful than room-temperature superconductors. What's next? "Hey, I've used my FTL spaceship to verify the material at those friendly alien's library"? The fact that there has been no Nobel prize and we didn't spend a week around the web arguing "yes, it works!", "no, didn't work for me", "yes, I verified it!" highly implies that the site is trying to say some…
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musicians often use them to generate distortion, which is purely an electrical phenomenon. germanium components tend to filter high frequencies and don't clip as sharply as silicon, generating tonal effects that can't really be replicated. but mostly, a lot of early guitar pedals used germanium components, and so they are associated with prestigious historic guitar players. here's a video demonstration. silicon first…
> generating tonal effects that can't really be replicated. Seems my headphones can replicate it judging from hearing the audio. Am I missing something?
Guitarists today still use tube amps and germanium transistors (in guitar pedals) for two reasons. The first is that most guitar amps back in the day used tubes (mostly) and the early guitar pedals used Germanium. Guitarists wanted to sound like the earlier musicians that used that technology [1] so they want to use that technology to achieve a certain tone with their instrument. The generation after them wanted to sound like them, so that means old tech for them, too! Repeat until today.
The second reason is that an electric guitar is a combination of a physical and electrical system, and the distortion that is essentially synonymous with electric guitars [2] comes from pushing an amplifier out of its “intended” linear regime [3] into the nonlinear regime where it stops amplifying and starts clipping the signal. The way this nonlinear regime varies with the choice of tubes and transistors, but in general you can’t really replicate one with the other. These unique non linearities impact both the output sound and, most importantly to me as a player, the way the amplifier responds to my physical technique (e.g., how the sound varies with how hard I hit a string). I have played solid state amps that aim to emulate tube amps, and to me the biggest difference isn’t the sound but that physical response. I haven’t played the top of the line modeling amps, but this has been my main problem with the practice amps I’ve tried. As a result, if I’m not playing in my bedroom (pushing a tube amp to distort at apartment friendly volumes is hard), I play through a tube amp. The differences between silicon and germanium transistors are similar, but more subtle and I’m someone who owns a lot of pedals and is constantly switching them out to fit my mood.
[1] an interesting counter example is that the Beatles used early solid state amps on at least some albums
[2] Plenty of people play “clean” without distortion, but if you spend time on guitar forums, you see a lot of beginners who ask a question of the form “I just got my first electric guitar, why doesn’t it sound like an electric guitar?”
[3] Early on the goal was to produce high headroom amps that didn’t distort, but this was very challenging. Rock musicians latched on to the distorted sound and then that became a design feature in later amps. However, if you try to make like a 59 Bassman distort, you have to play it loud enough to kill someone. You can also achieve distortion in other ways, e.g. clipping diodes, but that’s not really germane to this discussion.
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There are linear scaling DFT codes but they’re not available under open source licensing, only a strange license: https://onetep.org/
What the fuck? Linear scaling DFT is something way more impactful than room-temperature superconductors. What's next? "Hey, I've used my FTL spaceship to verify the material at those friendly alien's library"? The fact that there has been no Nobel prize and we didn't spend a week around the web arguing "yes, it works!", "no, didn't work for me", "yes, I verified it!" highly implies that the site is trying to say some…
https://www.3ds.com/fileadmin/PRODUCTS-SERVICES/BIOVIA/PDF/b...