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

arxiv.org

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

#961

Post by Bombinator »

dmix wrote: post #771
mk_stjames wrote: post #735

This is obviously a quickly produced paper to get the finding out but.... I find there to be so much missing and so many things poorly worded or posed about their process that would have taken zero time to expound upon, it's infuriating. "All the reactions are carried out under 10^-2 Pa" OK, I know they mean 10^-2 of vacuum. But why not say that? "10^-2 Pa" isn't enough. Was this a full vacuum oven? Done in sealed qu…

What personal benefit does this gain someone to publish it so quickly? Is it just social media attention?

From what I understand it was discovered in 1999, hence LK99. Doesn't seem very quick to me in that case.

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

#962

Post by amai »

I believe this is the first paper on arxiv that links to www.bilibili.com:

Supplementary video 1：Meissner effect for sample 2.

https://www.bilibili.com/video/BV14p4y1V7kS/?spm_id_from=333... c8fec748481fb4b933932e80c

Supplementary video 2：Exclude ferromagnetism of sample 2.

https://www.bilibili.com/video/BV13k4y1G7i1/?buvid=XY81B1F84... A291&is_story_h5=false&mid=jLEqsyica5eHkvtMXQ2K1A%3D%3D&plat_id=193&share_from=ug c&share_medium=android&share_plat=android&share_source=QQ&share_tag=s_i&timestamp= 1690894807&unique_k=B6gawMH&up_id=7590247

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

#963

Post by justsomehnguy »

lyre-lyre wrote: post #890
lifthrasiir wrote: post #384

So what the heck has happened with LK-99 really? (Disclaimer: I'm no physicist nor chemist, but I have co-written a report on three LK-99 papers [1] and am tracking the Twitter discussion as much as I can. I also got some help from knowledgable friends---much thanks for proof-reading.) It turned out that LK folks were not talking about some stupid shit. Specifically they were one of the last believers of long-forgott…

There is a tendency to call any scientific work that came out of anywhere in the former USSR as "Russian". Nikolay Bogolyubov is probably at least as "Ukrainian" as "Russian": he grew up and went to university in Kyiv, became a member of the Academy of Sciences of the Ukrainian SSR, and now has a physics institute named after him in Kyiv (and another in Moscow) -> https://www.encyclopedia.com/science/dictionaries-the…

> Nikolay Bogolyubov was born on 21 August 1909 in Nizhny Novgorod, Russian Empire to Russian Orthodox Church priest and seminary teacher of theology, psychology and philosophy Nikolay Mikhaylovich Bogolyubov, and Olga Nikolayevna Bogolyubova, a teacher of music

By your logic Euler is Russian

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

#964

Post by marginalia_nu »

eastbound wrote: post #947
marginalia_nu wrote: post #671

Earlier quoted context omitted.

It's also worth mentioning that room temperature superconductor "discoveries" happen a lot, and have always turned out to be a disappointment. It's been considered to be within the same bermuda triangle of scientific vaporware that demarked by quantum computers performing useful tasks, fusion power generation, that sort of thing. Always just around the corner and dude trust me it totally works in my lab. It's basical…

Talking about fusion, isn’t the major part of the Tokamak plant in Cadarache in France, dedicated to cooling down the superconductors to zero temperatures? If we make a leap in room-temperature superconductors, do we also make a leap in fusion?

It would help with one (out of many) problems in that field, sure. Though it would likely depend quite a bit on the nature of the superconductors we're able to produce.

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

#965

Post by hanniabu »

shaftoe wrote: post #926
hanniabu wrote: post #918

Earlier quoted context omitted.

A breakthrough of this kind should be illegal to patent

Why do you think so?

Why do you not think so..... what if the internet was patented? What if copper was patented?

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

#966

Post by arif22 »

mk_stjames wrote: post #735

This is obviously a quickly produced paper to get the finding out but.... I find there to be so much missing and so many things poorly worded or posed about their process that would have taken zero time to expound upon, it's infuriating. "All the reactions are carried out under 10^-2 Pa" OK, I know they mean 10^-2 of vacuum. But why not say that? "10^-2 Pa" isn't enough. Was this a full vacuum oven? Done in sealed qu…

[flagged]

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

#967

Post by 9991 »

qnleigh wrote: post #263
Daneel_ wrote: post #29

Earlier quoted context omitted.

It’s difficult to rule out external factors - a badly attached probe could also result in zero resistance for example. Showing diamagnetism is one of the least error-prone ways to demonstrate the superconductor effect. That’s my understanding anyway.

That's right. The standard way to measure resistance without being sensitive to contact resistance is called the four-terminal method, see ( https://en.m.wikipedia.org/wiki/Four-terminal_sensing ). You drive a current using two outer wires, but then detect the voltage across the sample using a different pair of wires. You'll measure zero voltage if it's superconducting, since V=IR. Or if one of the probe wires became…

Magnetic fields can move the probes.

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

#968

Post by osigurdson »

mk_stjames wrote: post #735

This is obviously a quickly produced paper to get the finding out but.... I find there to be so much missing and so many things poorly worded or posed about their process that would have taken zero time to expound upon, it's infuriating. "All the reactions are carried out under 10^-2 Pa" OK, I know they mean 10^-2 of vacuum. But why not say that? "10^-2 Pa" isn't enough. Was this a full vacuum oven? Done in sealed qu…

Why isn't 10^-2 Pa enough? Clearly they mean absolute pressure. What would 10^-2 of vacuum mean?

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

#969

Post by WhiteNoiz3 »

httpz wrote: post #44
cypherpunks01 wrote: post #21

Why are folks trying to prove that this material is a superconductor in roundabout ways, like levitation, dimagnetism, etc? What is the reason they don't just test to see if electrical current flows without resistance? Surely there is something I am missing here.

With the current fabrication process, they're only getting a chunk with LK-99 particles sprinkled in. Since nobody yet knows how to fabricate a pure chunk of LK-99, it'll be hard to measure the true resistance of LK-99.

Maybe a dumb question, but could you grind them up and separate out the superconducty bits with a magnet or would that destroy the effect?

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

#970

Post by dcow »

happytiger wrote: post #901
Al-Khwarizmi wrote: post #798

Earlier quoted context omitted.

This is a quite biased view. As a non-Chinese scientist, I can attest that there is intense pressure to publish as many papers as possible pretty much everywhere , and this leads to a problem of bad research across the world. China may be among the worst offenders in this respect, but the particular thing the OP is asking about doesn't strike me as a Chinese-specific thing at all. I see non-Chinese scientists rushing…

China publishes more science research with fabricated peer-review than everyone else put together https://qz.com/978037/china-publishes-more-science-research-... I respectfully submit that you may be providing an anecdotal experience. It’s so bad that China’s courts have called for the death penalty for scientific fraud. https://www.statnews.com/2017/06/23/china-death-penalty-rese... Goodness me.

> The move, as Nature explained, groups clinical trial data fraud with counterfeiting so that “if the approved drug causes health problems, it can result in a 10-year prison term or the death penalty, in the case of severe or fatal consequences.”

To be fair, according to TFA the death penalty is only for clinical trials where the drug or procedure, due to faked or doctored data, causes severe or fatal consequences.

It actually seems pretty reasonable to me. You develop a drug that actually kills people but fake your data to show it saves lives. Then you make money while people start dying, essentially killing people because your career was more important than reality. I’d call that murder.

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