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Andrew McCalip demonstrates synthesis of LK99

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Re: Andrew McCalip demonstrates synthesis of LK99

#221

Post by BaseballPhysics »

mycologos wrote: post #195
sanxiyn wrote: post #80

Earlier quoted context omitted.

World first replication was done by Iris Alexandra using her own accelerated process and there is no way Varda Space could have beaten her.

I don't understand why people are attaching any weight to Alexandra's claims. AFAIK, it's a pseudonymous account that has provided no evidence that couldn't be easily faked. You might object that the evidence provided by the non-pseudonymous scientists could also be faked, but the key distinction is that they're attaching real, professional identities to their claims. There are reputational consequences to making thi…

> I don't understand why people are attaching any weight to Alexandra's claims.

Confirmation bias is a hell of a drug.

Re: Andrew McCalip demonstrates synthesis of LK99

#223

Post by bee_rider »

svara wrote: post #161
anonylizard wrote: post #112

Earlier quoted context omitted.

This is simply what post-peer-review looks like. Instead of a few anonymous peer reviews, you get the entire planet to replicate. Moment you get something meaningful, publish it on arxiv. Quantity, not quality is king. Anomalies are drowned out by large samples. Questionable methods get mass debated in public. Scientists are dependent on public funding, why squander the biggest moment in pop science for literal decad…

> Questionable methods get mass debated in public. By people who don't know what they're talking about. You're seriously underestimating the level of expertise that it takes to professionally assess most research. It wouldn't be unusual for there to be a small handful of people with that ability in the world.

They say you don’t really understand something until you can teach it. I wonder to what extent “can I teach this to the general public, and do they care?” is an indicator of both understanding new results and also whether or not they really matter.

Of course, we’re often working on a tool to help make tools for other scientists, so that sort of thing is hard to explain to the general public, but ultimately it should terminate in some results that actually have obvious value to society in general.

Re: Andrew McCalip demonstrates synthesis of LK99

#224

Post by floxy »

ThePhysicist wrote: post #212

Honestly I don't see anything that would prove superconductivity in this video. If LK-99 is a type-II superconductor you should observe flux pinning i.e. you would be able to move the flake with a tweezer and it would be stuck in place as the magnetic flux lines are pinned to defects in the material. I haven't seen any details on the supposed properties of the material like the coherence length, but from the original…

There have been some people saying that LK-99 might only be superconducting in one dimension. Does anyone know how that (or even just 2-D/planar superconductivity) would effect the levitation of samples? For the 1-D case, maybe there would be issues in creating loops in the bulk material for persistent currents to flow in? It might be hard to make a Josephson junction unless you knew the orientation of the superconductivity direction? Has anybody studied this before? My intuition breaks down here.

Re: Andrew McCalip demonstrates synthesis of LK99

#225

Post by mholm »

tw1984 wrote: post #63
ssijak wrote: post #21

There is a Checz lab also documenting the process https://twitter.com/CondMatfyz

I am totally confused, it is documented in the original south korean paper, why anyone would want to rely on such second hand unverified info when first hand info from the original inventors are freely available to everyone?

It is documented fairly poorly in the South Korean paper. Not atrociously poorly, but enough that there's a fair bit of ambiguity, and several top labs have failed to replicate for this reason. When replication is this difficult, hundreds of labs doing experiments will give tremendous data on the principles behind what create the material, moreso than one lab repeating hundreds of small tweaks.

Re: Andrew McCalip demonstrates synthesis of LK99

#226

Post by SanderNL »

thepasswordis wrote: post #177
baq wrote: post #45

Earlier quoted context omitted.

It's jarring for us Euros (I dunno, ghosts of the war are still alive maybe?), but it's pretty normal stateside.

Are you saying Europeans dont have any national pride?

I think you would be hard pressed to find any Euro seriously and non-ironically proclaiming their country the best in the world. Then again, it's not unheard of.

It just sounds stupid here, because even when all of us combine we only ever so slightly pass the "regional power" mark. And we know it.

Re: Andrew McCalip demonstrates synthesis of LK99

#227

Post by marklubi »

ThePhysicist wrote: post #212

Honestly I don't see anything that would prove superconductivity in this video. If LK-99 is a type-II superconductor you should observe flux pinning i.e. you would be able to move the flake with a tweezer and it would be stuck in place as the magnetic flux lines are pinned to defects in the material. I haven't seen any details on the supposed properties of the material like the coherence length, but from the original…

[flagged]

Re: Andrew McCalip demonstrates synthesis of LK99

#228

Post by kjkjadksj »

anonylizard wrote: post #114
iamshs wrote: post #111

Earlier quoted context omitted.

All I see from US academics on Twitter are debates about this and that. Borderline annoying. This is the first result from mighty US capitalist machine meanwhile 3 Chinese labs have published pre prints and Russian replicated it in her kitchen.

This, its utterly shameful. Hot takes here, hot takes there, skepticism here, tell people to calm down there. Yet not a single replication! China has gone through multiple failed and successful replications so far. And the first US replication is from an amateur. If LK-99 works out, expect some congressmen to use this as a bludgeoning tool against the state of US public science.

To be fair, no one in the us has a grant to replicate something that came out this week. Its also the academic summer. A good amount of PIs are probably nowhere near their labs on vacation currently.

Re: Andrew McCalip demonstrates synthesis of LK99

#229

Post by jjoonathan »

marklubi wrote: post #227
ThePhysicist wrote: post #212

Honestly I don't see anything that would prove superconductivity in this video. If LK-99 is a type-II superconductor you should observe flux pinning i.e. you would be able to move the flake with a tweezer and it would be stuck in place as the magnetic flux lines are pinned to defects in the material. I haven't seen any details on the supposed properties of the material like the coherence length, but from the original…

[flagged]

Theranos raised $724 million using intentional deception.

LK99 is an incomplete paper that someone posted to arXiv.

Re: Andrew McCalip demonstrates synthesis of LK99

#230

Post by kjkjadksj »

toxik wrote: post #72
huijzer wrote: post #49

Earlier quoted context omitted.

> not a single big academic lab has managed to complete any sort of replication to date! They are still busy getting approvals from three layers of management and one group of lawyers.

Doesn’t ring true for me at all, academia is many things but if your supervisor is onboard, you can generally do anything.

Who can do anything? Things cost money and money is usually already earmarked for other things. The labs that can engage with this have both some sort of a slush fund or another account appropriate to charge these fishing expeditions to, and also a post doc who somehow has plenty of time on their hands to drop everything they are doing and validate a dubious result.
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