25 ms·
Flux Pinning in sample of LK-99?
- skecpical222 3y agoThe sample most probably sticks to a flexible membrane above the magnet (to something like a transparent contact lens - one can even clearly recognize a round circumference on the magnet plate surrounding the green junk).
- bhaney 3y ago[flagged]
- satvikpendem 3y agoI've seen people saying this on Twitter and elsewhere, where are we back from?
- sph 3y agoBack to annoy us with inane Twitterisms, I reckon.
- alchemist1e9 3y agoIt is kinda funny once you get used to it. When there is bad news they say “it’s so over” and good news “we’re so back”. The emotional rollercoaster on LK-99 is pretty intense and these phrases capture that for people. I get it at this point.
- kzrdude 3y agoSo it's the same as the Bob Ross memes of "Ruined", then :)
- phist_mcgee 3y agoIt's a relief valve for crowd mania. Humans really love to communicate in jokes, especially when those are in-jokes.
- Werewolf255 3y agoX-isms
- beowulfey 3y agoLife on twitter teeters on the edge separating intense excitement and horrific despair, and “we are back” means we’ve switched from one side to the other again
- _0ffh 3y agoIt's a split meme that refers to the emotional rollercoaster of a prolonged uncertain situation whenever news come in. Its two parts are "It's so over" when there's bad news and "We're so back" when there's good news.
- jacquesm 3y agoI wished they would keep it on Twitter and elsewhere and not bring that crap to HN.
- joquarky 3y agoWhile I agree with your sentiment, the phrase "we're back" is at least as old as the film (1988) Coming to America, probably older.
- shawabawa3 3y agoThis is basically proof of room temperature superconductivity correct? (Of course assuming it isn't a hoax)
- dmitrybrant 3y agoAssuming everything in the video is real, the only remaining question is: what is the actual temperature of that sample? If all of this checks out, then it's a new era.
- jiggawatts 3y agoSuch tiny samples warm up to room temperature very quickly, on the order of a few seconds. In my experience, it's not possible to make such small pieces of YBCO superconductor levitate, they warm up too fast.
- topynate 3y agoNo frost on the sample either. The only way I can think of to fake this in camera is to make the "sample" out of a strong magnet, and make the "magnet" a hollow shell concealing a chilled piece of YBCO!
- incrudible 3y agoYou would be surprised what can be achieved with bit of nylon string and an appropriate camera setup. If this is a most groundbreaking discovery, why waste all that screen resolution on the backdrop?
- wesleychen 3y agoI think because the minimum focus distance for most phone cameras is around 8 inches so they have to film kind of far away or else it will go blurry.
- anonymousiam 3y ago
- kzrdude 3y agoNitter: https://nitter.net/Andercot/status/1687740396691185664 https://nitter.net/Andercot/status/1687740396691185664
- kzrdude 3y agoAlternative video link here, but it's in chinese so no idea if it gives any more information about the source: https://news.ycombinator.com/item?id=37010498 https://news.ycombinator.com/item?id=37010498
- deleted 3y ago[deleted]
- yorwba 3y agoThe video is watermarked 炼丹师阿翔 (Alchemist Axiang), which is also the username of the Douyin video, so I think that's the closest to the original source we can get. (The tweet claims Bilibili as the source, but it was apparently a live stream and 炼丹师阿翔's Bilibili account currently only has a previous video without full levitation. https://bilibili.com/video/BV1sM4y1H7MX https://bilibili.com/video/BV1sM4y1H7MX )
- Kiro 3y agoOT but why do I need to press "enable this playback" and reload the page to view the clip? What does it do?
- meibo 3y agoBecause they want to avoid sending your IP to Twitter if you aren't going to watch the video, and the way to do that without JS is to only render the video embed if you actually request it.
- deleted 3y ago[deleted]
- trashburger 3y agoHLS is a way to serve a video in chunks over HTTP. It's how livestreams are implemented in most places. Twitter serves videos in HLS chunks, but Nitter doesn't want to proxy it to you because videos take a lot of bandwidth. In order to let you choose whether you want to connect to Twitter servers, it first asks you whether you want to enable playback.
- deleted 3y ago[deleted]
- amelius 3y agoCan anyone explain if the specimen was found through rigorous research or just sheer luck? Because it is starting to seem like it's the latter.
- gonehome 3y agoNo idea if accurate but there was this which is interesting: https://news.ycombinator.com/item?id=36996337 https://news.ycombinator.com/item?id=36996337 > “ Specifically they were one of the last believers of long-forgotten Russian theory of superconductivity, pioneered by Nikolay Bogolyubov. The accepted theory is entirely based on Cooper pairs, but this theory suggests that a sufficient constraint on electrons may allow superconductivity without actual Cooper pairs. This requires carefully positioned point defects in the crystalline structure, which contemporary scientists consider unlikely and such mode of SC was never formally categorized unlike type-I and type-II SC. Professor Tong-seek Chair (최동식) represented a regret about this status quo (in 90s, but still applies today) that this theory was largely forgotten without the proper assessment after the fall of USSR. It was also a very interesting twist that Iris Alexandria, "that Russian catgirl chemist", had an advisor who was a physicist-cum-biochemist studied this theory and as a result were so familiar with the theory that they were able to tell if replications follow the theoretical prediction.” So it might be an old hypothesis brought back?
- sidlls 3y agoA very large quantity of discoveries in science are a combination of "well, that's odd" and the "sheer luck" associated with the circumstances producing that statement. (This isn't a commentary on the truthfulness of the superconductor claims.)
- amelius 3y agoYes, but that doesn't answer the question ...
- mensetmanusman 3y agoYes it does, the answer is both, but with the caveat that there were people focused on rolling the dice of luck to search for this.
- progrus 3y ago[flagged]
- BasedAnon 3y ago[flagged]
- ImPostingOnHN 3y agothe actual room temperature superconductor was adrenochrome the whole time!
- BasedAnon 3y agoadrenochrome? chrome? metal? you know what else is a metal? lead! lead apatite? appetite? hunger? hungry for... metal???? i think you've cracked it
- progrus 3y agoYes, yes, this person gets it. Thank you.
- Waterluvian 3y agoI’d rather evoke “alchemy” if we’re going to reach for the non-scientific magic explanations.
- BasedAnon 3y agois it possible in theory that flux-pinning could occur without actually causing superconductivity? because LK-99 seems to be decoupling alot of properties we thought were coupled if I'm understanding correctly?
- traverseda 3y agoIt could be an entirely new hitherto unobserved phenomena, but that seems pretty unlikely. I think that having a bunch of tiny superconductors chunks separated by a regular conductor would explain a lot.
- jacquesm 3y agoThat would require 'new physics'. I think most of the weirdness stems from either (1) sample impurity, (2) an extreme form of that where the active bits are really tiny in a large chunk of inert stuff or stuff with its own electromagnetic properties or (3) being mistaken about it being a superconductor in the first place.
- semajian 3y agoIt's hard to imagine how this could be faked short of digital manipulation, and it seems implausible that it would be a known high TC superconductor because it would warm up too fast. Absent the former explantation, I'm starting to believe this is real. Also, it's not like all the author's are unknown hacks. Hyun Tak Kim has about 10k citations (Google scholar, which sometimes combines people who have the same name though) and authored a paper in scientific reports which got L&K interested in collaborating with him. The guy seems to know superconductivity so I'm feeling rather optimistic about this.
- stavros 3y ago> It's hard to imagine how this could be faked short of digital manipulation So, it's easy to imagine how this could be faked.
- semajian 3y agoWell, yes
- stavros 3y agoI'm holding a small basket until one of the reputable labs reproduces this. Anonymous videos on Twitter are a bit too anonymous for me.
- marcosdumay 3y agoI guess the point is, it can be a fabrication, it can be something very important, and it can't really be anything in between.
- ncr100 3y agoAlternatively, https://en.wikipedia.org/wiki/Pyrolytic_carbon https://en.wikipedia.org/wiki/Pyrolytic_carbon is discussed in the Twitter thread by the OP as a possible explanation of "not superconductivity" . . .
- 3y ago
- eugene3306 3y agoIs this material safe to handle? It feels like this thing soon will start appearing all over ebay and aliexpress
- naillo 3y agoWould that be legal, considering they have a patent (pending) for it? Not denying it won't appear anyway just curious
- deleted 3y ago[deleted]
- TheAceOfHearts 3y agoI'm not sure how it works, but this was the first result: > Patents are territorial and must be filed in each country where protection is sought. [0] https://www.stopfakes.gov/article?id=Is-My-US-Patent-Good-in-Other-Countries https://www.stopfakes.gov/article?id=Is-My-US-Patent-Good-in...
- jtwaleson 3y agoNot a patent attorney, but as far as I know: The patent is currently pending (as in, being evaluated to see if it will be granted). Once it is granted in one country it can be expanded to multiple countries within a couple of months, given that the first country is part of the Patent Cooperation Treaty. So if an invention is marked “patent pending”, you know you will have the risk of being sued by said company at some time in the future if you copy the invention.
- mensetmanusman 3y agoIt is illegal in places that have rule of law. This is to create a risk reduction mechanism for investing in capital to make this at scale, which will cost on the order of $100-500M to scale for world use through trial and error. If IP is ignored, no business will invest in the initial experiments due to first mover disadvantage in game theory.
- m3kw9 3y agoIt didn’t pin, it bounces, if it was flux pinning it would not bounce when you push it down.
- jack_riminton 3y agoFlux pinning doesn’t mean it can withstand all forces it just means it will return to where it was
- traverseda 3y agoWhat about those Flux pinned maglev "trains" you see on YouTube?
- mcpackieh 3y agoWhat do you mean "what about?" them? Can you post a video of any of those that don't jiggle when poked?
- XorNot 3y agoThe idea of those (i.e. like this https://www.youtube.com/watch?v=AWojYBhvfjM&vl=en https://www.youtube.com/watch?v=AWojYBhvfjM&vl=en) is that they're an example of equi-potential behavior. The superconductor can move because it's staying at a consistent height. The video linked is also pretty good at showing similar behaviors to the sample of LK99 we see claimed in the video: the superconductor can wobble, shake and does return to it's original position (or tries to) - but it's got a lot more mass.
- jacquesm 3y agoAnd when you change the mass of the train the height of levitation changes.
- traverseda 3y agoYeah, it's jumping back to a fixed position which isn't how I thought the Meissner effect worked. Since this seems to be posted by someone reputable though it's weird they missed that.
- justicz 3y agoThe post just says the video came from BiliBili. Does anyone know the actual source? I want to believe but this video is suspicious.
- deleted 3y ago[deleted]
- est 3y agothe source is Chinese tiktok (douyin) https://www.douyin.com/video/7263715495256378659 https://www.douyin.com/video/7263715495256378659
- kzrdude 3y agoTo be considered a rumor > He posted on his personal social media, According to public information, he is an assistant engineer in the Department of Metallurgical Engineering and Materials of Wuhan University of Science and Technology, and is also a doctoral candidate at the school. https://nitter.net/songwenxuan6/status/1687850304803426306 https://nitter.net/songwenxuan6/status/1687850304803426306
- 38 3y agonon crap link: http://farside.link/twitter.com/andercot/status/1687740396691185664 http://farside.link/twitter.com/andercot/status/168774039669...
- deleted 3y ago[deleted]
- PUSH_AX 3y agoForgive me, I know little about these things, but what’s the relationship between this phenomenon and the quantum locking seen in other super conducting magnets, this looks as described as “pinned”, what would allow it to behave like the famous video of the magnets levitating around that circular track: https://youtu.be/Ws6AAhTw7RA https://youtu.be/Ws6AAhTw7RA
- marcosdumay 3y agoSuperconductors will resist moving at any direction where the magnetic flux gets weaker, stronger, or changes direction. That's why they get described as "pinned". Other diamagnets do that too, but in a decaying way that allows for movement. They usually rotate or move slowly sideways. No other kind of magnetism show similar behavior. They either attract or repel all the way in.
- keepamovin 3y agoWhat I like most about this development is that, suddenly, folks with "CEO " or "Founder " in their Twitter bio look uncool, while folks with "<hardscience>" in their twitter bio are uber cool. Note to pedants: yes yes, the Venn diagram has an intersection.
- naillo 3y agoPeople with <hardscience> in their bio have always been cooler
- fHr 3y agofacts
- kinlan 3y agoNow they're room temperature at ambient pressure.
- dilippkumar 3y agoMy measly single upvote is insufficient to express how hard I laughed at this. Bravo!
- keepamovin 3y agoThat is very clever!
- kinlan 3y agoAppreciate you both. :)
- malermeister 3y agoFolks with CEO or "Founder" in their bio have always looked uncool imo.
- phreeza 3y agoSomeone linked to this on the manifold market: https://imgur.io/a/AY1oaIO https://imgur.io/a/AY1oaIO it does look a bit weird to me but I am not expert enough to tell if this could be explained by optical/compression effects.
- incrudible 3y agoLooks unlike any compression artifact I have ever seen. Two remarkable discoveries in one video! Big, if true.
- arecurrence 3y agoIn the lk99 subreddit, a higher res video was posted https://www.douyin.com/video/7263715495256378659 https://www.douyin.com/video/7263715495256378659
- incrudible 3y agoThe most likely explanation: This is a speck of dirt on a string filmed as an attempt to manipulate the prediction markets.
- im3w1l 3y agoIt's possible that I misunderstand, but I think the title is a little inaccurate. Flux pinning goes beyond just levitation. In the embedded video we can see that the sample is not just levitating freely above the magnet, but it levitates above a certain fixed point. After gently poking the sample we can see it returning to its original position and orientation.
- deleted 3y ago[deleted]
- 2-718-281-828 3y ago[flagged]
- occam65 3y agoFunny you mention this. I've decided just today to begin a full week of no Twitter or YouTube. To keep myself on top of my addictions, rather than fully succumbed to them. Props to you for deleting your account and going all in.
- 2-718-281-828 3y agostay strong, bro, lots of twitter fan bois here
- fghorow 3y agoAn oddball question for the device physicists here: Assume for now (subject to verification, of course!) that this material is a non-Cooper-pair superconductor. Could one still build Josephson junctions -- and SQUIDs -- from this material? If the answer is "yes", it's going to make a whole lot of magnetotelluric geophysicists very, VERY happy.
- zakary 3y agoCan you explain what uses room temp squids and JJ’s would have for magnetotelluric geophysics?
- defrost 3y agoBetter cheaper faster ultrahigh magnetic sensing of magnetic flux and field across a broad dynamic range. Typical setups are networked fields of multiple axis sub nanotesla magnetic sensors with processing to reduce noise and subtract interference in order to extract a differential change across time and space to convert to a deep earth image. You know, the usual stuff. The essential principal is a fixed sensor (network) that records the diurnal (daily) magnetic flux and specifically locals for local 'drag' caused by local features (deep metal deposits, more generally volumes with varying magnetic properties).
- fghorow 3y agoNot to mention no more HUGE and HEAVY field coils to lug around and bury...
- lucubratory 3y ago1. This video is originally from an anonymous Douyin account. There is no verification that it is associated with a real replication attempt, from traditional academia or citizen science. There is a previous video on the channel showing the partial levitation more common to LK-99, but it likewise has no particular evidence it's not just a flake of pyrolitic graphite. It is claimed to be associated with a specific person but no evidence is provided. There is no reputation to be lost if this is a fake. 2. In the video, while the effect dynamics look quite good for flux pinning, there is some really concerning artifacting on the alleged LK-99 piece while it bounces. Specifically, it looks like it may be attached to a taut horizontal string that has then been edited out, but they didn't successfully rotoscope over the parts very close to the alleged LK-99 piece during specific moments. This could just be a compression artifact, I have never seen one like this but apparently this is a capture of a capture by the time we can access it, and I don't use Douyin or Bilibili so I wouldn't have a lot of familiarity with what their compression artifacts look like. Basically, I am pretty sceptical about this video in specific. I do think LK-99 is more likely than not at this point, but I also think it's more likely than not that this specific video is not real. I also think it's extremely likely that as LK-99's profile raises and VFX editors get more familiar with what exactly a real video should look like, convincing fakes are going to be produced and go viral. The most common way this happens is that the VFX artist does it as an exercise and shows a few people without ill intent, but the video is then reposted by other people a few times until it reaches a wide audience who has no chance of knowing its origin. However, there are some scammers/influencers who are good with VFX and can fake a video themselves. Basically, be a little bit careful about video, and things you should want are: the camera is moving around the piece and not static, the light changes during the video, the pieces themselves are moving, you see the pieces getting set up or finished later, and there's stuff moving all around the object to make strings less likely.
- cpleppert 3y agoI looked at the highest quality and the artifacting is just crazy here. There are no artifacts around the instrument at all, just on the supposedly levitating rock. The quality on this and the other video from the user looks like its very good so I don't really buy this. The context here is rather strange as well, the same user uploaded another video that no one would believe actually demonstrated the meissner effect. Its a very small magnet on just a piece of paper. Did the user try again with this video?
- xqcgrek2 3y agoThese grainy and blurry videos from China are simply not credible.
- macintux 3y agoMuch higher res version from the earlier thread: https://www.douyin.com/video/7263715495256378659 https://www.douyin.com/video/7263715495256378659
- skecpical222 3y ago[dead]
- throwaway98uw 3y ago[flagged]
- kimorpark 3y agoElsa zhou says the wust student denied he posted it so authenticity cannot be confirmed. Assume fake video 4 now
- amai 3y agoSo lk-99 is supposed to behave like a type-II superconductor? Is this expected for a room temperature superconductor?