People in plant physiology : 3 lane IP is an abomination, physiological relevance doubtful
People in material science : Here's an observation that lacks controls coupled to irrelevant literature through numerology.

— Iris (@iris_IGB) August 16, 2023

[IMG_3441.jpeg]

She XXed the following neat paper discussion afterwards

She's so perfect

https://twitter.com/iris_igb/status/1691900114581717203

Oh, in other news

https://twitter.com/iris_igb/status/1691855741232054337

BTFOing "Nature" ( journos)

https://twitter.com/iris_igb/status/1691840478189384097

The krillshot (soyentists BTFO)

https://twitter.com/iris_igb/status/1691787651748077863

@lain was asking about embedded stuff that can be fit into small spaces. I mentioned APE but I also wanted to mention this here as well :)

https://www.reddit.com/r/itrunsdoom/

https://knowyourmeme.com/memes/it-runs-doom

Found a really cool repo lurking the Github for good R cowtools. Looks really cool!

edit: turns out something similar was posted 8 days ago but I was not here so idc, take another L

https://rdrama.net/post/195134/its-over-for-futuristcels-marseyitsover-lk99

orange 'you glad you listened you didn't get hyped up' forum

Researchers seem to have solved the puzzle of LK-99. Scientific detective work has unearthed evidence that the material is not a superconductor, and clarified its actual properties.

The conclusion dashes hopes that LK-99 — a compound of copper, lead, phosphorus and oxygen — marked the discovery of the first superconductor that works at room temperature and ambient pressure. Instead, studies have shown that impurities in the material — in particular, copper sulfide — were responsible for the sharp drops in electrical resistivity and partial levitation over a magnet, which looked similar to properties exhibited by superconductors.

“I think things are pretty decisively settled at this point,” says Inna Vishik, a condensed-matter experimentalist at the University of California, Davis.

Claimed superconductor LK-99 is an online sensation — but replication efforts fall short

The LK-99 saga began in late July, when a team led by Sukbae Lee and Ji-Hoon Kim at the Quantum Energy Research Centre, a start-up firm in Seoul, published preprints1,2 claiming that LK-99 is a superconductor at normal pressure and temperatures up to at least 127 ºC (400 kelvin). All previously confirmed superconductors function only at extreme temperatures and pressures.

The extraordinary claim quickly grabbed the attention of the science-interested public and researchers, some of whom tried to replicate LK-99. Initial attempts did not see signs of room-temperature superconductivity, but were not conclusive. Now, after dozens of replication efforts, many experts are confidently saying that the evidence shows LK-99 is not a room-temperature superconductor. (Lee and Kim's team did not respond to Nature's request for comment.)

Accumulating evidence

The South Korean team based its claim on two of LK-99's properties: levitation above a magnet and abrupt drops in resistivity. But separate teams in Beijing, at Peking University3 and the Chinese Academy of Sciences4 (CAS), found mundane explanations for these phenomena.

Another study5, by US and European researchers, combined experimental and theoretical evidence to demonstrate how LK-99's structure made superconductivity infeasible. And other experimenters synthesized and studied pure samples6 of LK-99, erasing doubts about the material's structure and confirming that it is not a superconductor, but an insulator.

The only further confirmation would come from the Korean team sharing their samples, says Michael Fuhrer, a physicist at Monash University in Melbourne, Australia. “The burden's on them to convince everybody else,” he says.

Perhaps the most striking evidence for LK-99's superconductivity was a video taken by the Korean team that showed a coin-shaped sample of silvery material wobbling over a magnet. The team said the sample was levitating because of the Meissner effect — a hallmark of superconductivity in which a material expels magnetic fields. Multiple unverified videos of LK-99 levitating subsequently circulated on social media, but none of the researchers who initially tried to replicate the findings observed any levitation.

Half-baked levitation

Several red flags popped out to Derrick van Gennep, a former condensed-matter researcher at Harvard University in Cambridge, Massachusetts, who now works in finance but was intrigued by LK-99. In the video, the same edge of the sample seemed to stick to the magnet, and it seemed delicately balanced. By contrast, superconductors that levitate over magnets can be spun and even held upside-down. “None of those behaviors look like what we see in the LK-99 videos,” van Gennep says.

He thought LK-99's properties were more likely the result of ferromagnetism. So he constructed a pellet of compressed graphite shavings with iron filings glued to it. A video made by Van Gennep shows that his disc — made of non-superconducting, ferromagnetic materials — mimicked LK-99's behaviour.

On 7 August, the Peking University team reported that this “half-levitation” appeared in their LK-99 samples because of ferromagnetism. “It's exactly like an iron-filing experiment,” says Yuan Li, a condensed-matter physicist and study co-author. The pellet experiences a lifting force but it's not enough to levitate — only enough to balance on one end.

Li and his colleagues measured their sample's resistivity, and found no sign of superconductivity. But they couldn't explain the sharp resistivity drop seen by the Korean team.

Impure samples

In their preprint, the Korean authors note one particular temperature at which LK-99's showed a tenfold drop in resistivity, from about 0.02 ohms per centimetre to 0.002 ohms per cm. “They were very precise about it. 104.8ºC,” says Prashant Jain, a chemist at the University of Illinois Urbana–Champaign. “I was like, wait a minute, I know this temperature.”

The reaction that synthesizes LK-99 uses an unbalanced recipe: for every 1 part copper-doped lead phosphate crystal — pure LK-99 — it makes, it produces 17 parts copper and 5 parts sulfur. These leftovers lead to numerous impurities — especially copper sulfide, which the Korean team reported in its sample.

Jain, a copper-sulfide expert, remembered 104ºC as the temperature at which Cu2S undergoes a phase transition if exposed to air. Below that temperature, Cu2S's resistivity drops dramatically — a signal almost identical to LK-99's purported superconducting phase transition. “I was almost in disbelief that they missed it.” Jain published a preprint7 on the important confounding effect on 7 August.

The next day, the CAS team reported on the effects of Cu2S impurities in LK-99. “Different contents of Cu2S can be synthesized using different processes,” says Jianlin Luo, a CAS physicist. The researchers tested two samples — the first heated in a vacuum, which resulted in 5% Cu2S content, and the second in air, which gave 70% Cu2S content.

The first sample's resistivity increased relatively smoothly as it cooled, and appeared similar to samples from other replication attempts. But the second sample's resistivity plunged near 112 ºC (385K) — closely matching the Korean team's observations.

“That was the moment where I said, ‘Well, obviously, that's what made them think this was a superconductor,'” says Fuhrer. “The nail in the coffin was this copper sulfide thing.”

Making conclusive statements about LK-99's properties is difficult, because the material is finicky and samples contain varying impurities. “Even from our own growth, different batches will be slightly different,” says Li. But Li argues that samples that are close enough to the original are sufficient for checking whether LK-99 is a superconductor in ambient coniditions.

Crystal clear

With strong explanations for the resistivity drop and the half-levitation, many in the community were convinced that LK-99 was not a room-temperature superconductor. But mysteries lingered — namely, what were the material's actual properties?

Initial theoretical attempts using an approach called density functional theory (DFT) to predict LK-99's structure had hinted at interesting electronic signatures called ‘flat bands'. These are areas where the electrons move slowly and can be strongly correlated. In some cases, this behavior leads to superconductivity. But these calculations were based on unverified assumptions about LK-99's structure.

To better understand the material, the US–European group5 performed precision X-ray imaging of their samples to calculate LK-99's structure. Crucially, the imaging allowed them to make rigorous calculations that clarified the situation of the flat bands: they were not conducive to superconductivity. Instead, the flat bands in LK-99 came from strongly localized electrons, which cannot ‘hop' in the way a superconductor requires.

On 14 August, a separate team, at the Max Planck Institute for Solid State Research in Stuttgart, Germany, reported6 synthesizing pure, single crystals of LK-99. Unlike previous synthesis attempts that relied on crucibles, the researchers used a technique called floating zone crystal growth that allowed them to avoid introducing sulfur into the reaction, eliminating the Cu2S impurities.

The result was a transparent purple crystal — pure LK-99, or Pb8.8Cu1.2P6O25. Separated from impurities, LK-99 is not a superconductor, but an insulator with a resistance in the millions of ohms — too high to run a standard conductivity test. It shows minor ferromagnetism and diamagnetism, but not enough for even partial levitation. “We therefore rule out the presence of superconductivity,” the team concluded.

The team suggests that the hints of superconductivity seen in LK-99 were attributable to Cu2S impurities, which are absent from their crystal. “This story is exactly showing why we need single crystals,” says Pascal Puphal, a specialist in crystal growth and the Max Planck physicist who led the study. “When we have single crystals, we can clearly study the intrinsic properties of a system.”

Lessons learned

Many researchers are reflecting on what they've learned from the summer's superconductivity sensation.

For Leslie Schoop, a solid-state chemist at Princeton University in New Jersey, who co-authored the flat-bands study, the lesson about premature calculations is clear. “Even before LK-99, I have been giving talks about how you need to be careful with DFT, and now I have the best story ever for my next summer school,” she says.

Jain points to the importance of old, often overlooked data — the crucial measurements that he relied on for the resistivity of Cu2S were published in 1951.

While some commentators have pointed to the LK-99 saga as a model for reproducibility in science, others say that it's an unusually swift resolution of a high-profile puzzle. “Often these things die this very slow death, where it's just the rumors and nobody can reproduce it,” says Fuhrer.

When copper oxide superconductors were discovered in 1986, researchers leapt to probe their properties. But nearly four decades later, there is still debate over the material's superconducting mechanism, says Vishik. Efforts to explain LK-99 came readily. “The detective work that wraps up all of the pieces of the original observation — I think that's really fantastic,” she says. “And it's relatively rare.”

doi: https://doi.org/10.1038/d41586-023-02585-7

tldr: no flying cars or someshit idk

for reference see any of the numerous posts here

https://rdrama.net/search/posts/?q=superconductor

Empress's identity REVEALED as Voksi the Bulgarian! Is it over for piracychads?

Reddit: https://old.reddit.com/r/CrackWatch/comments/15spn46/shipgraveyardsimulator2readnfoskidrow_response_to/

Empress's response (Reddit): https://old.reddit.com/r/CrackWatch/comments/15ssekk/empress_response_to_skidrow/

Linus will focus for a whole week now how to damage control this or disaster

You can buy a lot of potatoes with €1000.

Orange Site discussion

Highlights:

Chadmins are also banning everyone for saying they're leaving

What surprises me is that people think making a community specifically for illegal activity isn't a problem, and that they should only be called on their behaviour when a copyright holder notices them. There are plenty of places to go for piracy online, so what's the need to add a community for it here? Or are you people claiming a piracy community wasn't primarily intended for piracy?

https://lemmy.world/comment/2426956

Time to host my own instance. I disagree with this move.

https://lemmy.world/comment/2429393

The people whining are not the people that could face multimillion-dollar lawsuits over the issue. Like it or not, media companies are powerful and will go after websites seen as promoting piracy. Do what you reasonably have to do.

https://lemmy.world/comment/2426973

Oh no. Wtf. Do you know what's funny? I actually joined this instance from piracy subreddit.

I guess it's time to leave.

https://lemmy.world/comment/2425186

I don't think this was the right call. Don't have it hosted on here, fine. But defederated? I don't see how being federated would be an issue at all. Oh well guess i got to actively go seek them out now.

At this rate, you might as well as defederate from all instances. Cant be too careful.

https://lemmy.world/comment/2427348

Bootlicker [-8]

https://lemmy.world/comment/2427940

These communities are not even hosted on lemmy.world, this is an absurdly overreacted response. There were no signs of any legal trouble and I can't understand how lemmy.world specifically would be the target of such legal action. If you want to host an instance, you should do everything in your power to allow discussions on any topic, while in necessary cases disallowing direct posting/linking of illegal content. Instead, you chose to block a community that has long been known to avoid having any trouble with the moderators.

https://lemmy.world/comment/2421890

Doesn't matter if they are hosted here or not. The way federation works is that threads on different instances are cached locally.

We have NO issues with the people at db0 - we are just looking out for ourselves in a ‘better safe than sorry' fashion while we find out more. As mentioned in the OP we would like to unblock as soon as we know we can not get in any legal trouble. [chadmins]

https://lemmy.world/comment/2421890

What the absolute heck? What makes this place so good is that there's not people making idiot decisions at the top. This is an idiot decision. Plus side of the fediverse is vanishing.

https://lemmy.world/comment/2424687

Uh, @[email protected] … what's up with the banning going on in this thread? I noticed on a.lemmy.org that someone was labeled “banned” and their comment was simply “Ight, I'm out”

The mod note was “Let us help you”.

There are more similarly weak (spiteful?) bans that certainly don't seem to be at a standard for a ban. “Litterally 1984” was another one. Is that all it takes to be banned here?

Edit: Many (all?) the users I referenced as banned are now unbanned from the site, but now banned from this community.

https://lemmy.world/comment/2422473

Please make announcements on lemmy instead of exclusively on groomercord moving forward. That is the biggest issue here, the lack of public transparency. Such a decision affects all instances, not just lemmy.world and making it publicly known is important

This was a misunderstanding from one of the team members. It has since been discussed and will not happen again. Lemmy.World and this announcement community is our primary platform, [chadmin]

https://lemmy.world/comment/2421280

And once again we have people thinking that the instance owners would have to discuss everything they want to do with them and get the approval of everyone. It's already great that they're making announcements instead of doing it silently until people notice on their own. Plus, it's not hard to make an account elsewhere if you don't like it here. I doubt you're restricted to this single instance.

https://lemmy.world/comment/2424187

Ight, I'm out

https://lemmy.world/comment/2421940

Surely there is a discussion to be had around what is and isn't allowed, there are plenty of subreddits discussing piracy without dolirect links that are playing within the rules.

https://lemmy.world/comment/2420730

fricking heck, its time to leave lemmy.world, you are no better than reddit

Says the redditor

https://lemmy.world/comment/2422227

What is the legal theory being used here?

People chatting about piracy is now a crime in US? I thought the crime was uploading or downloading copyrighted content…

https://lemmy.world/comment/2421667

Lovely this happened because someone complained after being banned from the piracy instance for being a transphobic butthole.

https://lemmy.world/comment/2421151

Yea, I'm leaving. Not as a protest, I just want access to something without caring if devs like it or not.

All hail Piracy!

https://lemmy.world/comment/2421558

Well said! I think the entire LW community would prefer a heads up for major actions. It's understandable that piracy could lead to liability issues which none of us want. Thanks for giving us a run down.

https://lemmy.world/comment/2420912

Is it a liability when the discussion happened outside of lemmy.world?

https://lemmy.world/comment/2421575

Deleting lemmy now I guess as well [-3]

https://lemmy.world/comment/2424715

Wtf? I'm leaving.

Is there a way to migrate a community? [-3]

https://lemmy.world/comment/2428100

I'm sure this comment will receive plenty of hate, but I'm really struggling to understand why piracy seems to get so staunchly defended by seemingly everyone here. Piracy is stealing. It is morally wrong. We can argue all day about how it's a ‘victimless crime' or how media conglomerates are greedy and deserve it, but at the end of the day there's nothing that makes it ‘right'. With maybe a few exceptions, no one needs the things they're pirating and it's just childish to refuse to pay for content and go on pretending it's a necessity. What needs to happen is more money going to the creators whose content we all enjoy so much.

There's plenty of places to go where you can still interact with these communities, and we shouldn't be surprised that a large and general instance wants to be distant from them. Personally I applaud the decision. [-6]

https://lemmy.world/comment/2426834

Literally 1984 [-14]

https://lemmy.world/comment/2421877

TLDR:

Linus gets a GPU cooler to review. He attaches it to the wrong GPU and then claims the cooler is shit when it doesn't perform well.

G*mer dude calls Linus out for being a cute twink.

Linus chucks and sneeds, claiming it wasn't his fault.

Proceeds to get btfo at every step by g*mer dude.

G*mer dude videos on the drama:

Part 1:

Part 2:

Edit - Kaamrev post about the reddit side of the drama

https://rdrama.net/post/197101/yo-guys-rpcmastercucks-having-a-sneed

Edit Edit- Update from Billet

hexbear chapos

lemmy post with kbin dev response

redditalternatives soys

t

You may not like it, but this is what supreme intellect looks like.

This individual single handedly unveiled an NSA or CIA operation.

It is 100% not a shared hosting server for WordPress installations owner by HostGator. https://t.co/Cb65OiAJA4

— vx-underground (@vxunderground) August 15, 2023

Oh fuuudge. Hey there, defconners, test when you get home. I caught an unwanted present at the con, and maybe you did, too. pic.twitter.com/jrUmzfhjP2

— Deth Veggie (@DethVeggie) August 14, 2023

After a thread was made in [email protected] asking to defederate from lemmy.dbzer0.com for "the facilitation of piracy, and copyright infringement in general which is illegal", the admins of lemmy.world deleted it prompting discussions on asklemmy and piracy.

fedilore ( Lemmy SRD) discusses

https://lemmy.world/post/3191819?scrollToComments=true

https://lemmy.world/post/3191839?scrollToComments=true

Edit: More seething lemmings

when a kid asks me what the largest number is that's what I'm going to tell him and none of you glasses-wearing nerds can stop me

DISCORDCELS IN SHAMBLES