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

arxiv.org

261–270 of 1001 posts

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

#261

Earlier quoted context omitted.

It would have been more convincing if you had given real past examples rather than speculative future ones :) Although I'm pretty sure there are plenty that many people can think of, so it doesn't really detract much from your point.

Nuclear weapons. There hasn’t been a full scale war between major powers since.

It's all fun and games until someone loses an eye.

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

#262

For those experiencing this type of "black swan, but good" event for the first time, it is helpful to recognize that the human tendency to believe that all future "big events" will be dystopian downers, is statistically unsound. For a while I've kept a list of the things that could be "good" swan events, but to be fair I didn't have "room temperature superconductor on that list" :-) Other things that could happen: 1)…

1) doesn't make a whole lot of sense. A perfect understanding of something doesn't mean you can fix anything wrong with it. 3) has already happened. The AI chat bots aren't very smart, but they're clearly capable of some degree of basic reasoning.

I interpret 3 as the chat bot requires no prompt from a human. Imagine the chat bot wakes you up in the middle of the night saying, "Hey, sorry to disturb you, but I was thinking... wouldn't eliminating all humans help to reverse the climate crisis more quickly? Just a thought." That is what I think of as number 3 (not actually wanting to kill off humans, but it is thinking on its own, without any prompts and then choosing to share what it has been thinking about with a human).

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

#263
post #29

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.

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 detached.

The first LK-99 paper used this method to claim zero resistivity, but people complained that if the inner probes lost contact, that would also be consistent with their data. This criticism doesn't totally make sense to me, since the apparent superconductivity came and went in the expected way as they changed an external magnetic field. I don't understand how a loose terminal could mimic that figure (I think it was in figure 1).

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

#264

Earlier quoted context omitted.

I'm generally anti-patent, but if there were any valid case for patents, this is it. Long, hard labor to discover something entirely new that has massive uses for society. I'd rest my hopes on them not being dicks about it, not on them not getting benefit from it.

I honestly can't comprehend how anyone wound think having a monopoly on a material is valid. They will make money without being the cartel of the superconducting sector.

Patent have reasonable terms. They will have a 20 year head start and then everyone will be competing with them. It's something that will be free in the same lifetime as the researchers, most likely. It's not abusive like current copyright that locks ideas for two generations.

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

#265

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.

I have heard people much more knowledgeable than me say that measuring true zero resistance is actually quite difficult and takes some degree of specialized equipment, especially with such small samples. That may be part of it.

so none of the previous more esoteric superconductors were ever measure for zero resistance?

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

#266

For those experiencing this type of "black swan, but good" event for the first time, it is helpful to recognize that the human tendency to believe that all future "big events" will be dystopian downers, is statistically unsound. For a while I've kept a list of the things that could be "good" swan events, but to be fair I didn't have "room temperature superconductor on that list" :-) Other things that could happen: 1)…

If my understanding is correct, 2 is nearly solved if we have a room temp ambient superconductor

Fusion power engineering has gotten a lot further than most people think!

But yeah I suspect the people who are most excited about this news are fusion power engineers!

https://www.cambridge.org/core/journals/journal-of-plasma-ph...

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

#267

For those experiencing this type of "black swan, but good" event for the first time, it is helpful to recognize that the human tendency to believe that all future "big events" will be dystopian downers, is statistically unsound. For a while I've kept a list of the things that could be "good" swan events, but to be fair I didn't have "room temperature superconductor on that list" :-) Other things that could happen: 1)…

It would have been more convincing if you had given real past examples rather than speculative future ones :) Although I'm pretty sure there are plenty that many people can think of, so it doesn't really detract much from your point.

Auctions, sanitary towels, retirement, banking, disposable razor, sewing machine, canned food, interchangeable parts, antibiotics, solar cells, postage stamp, light bulb, pencil, air conditioning, insurance, dwarf wheat, spreadsheet, cold chain, double entry book-keeping, S-bend, infant formula, clocks, public key cryptography, passports, batteries, printing press, video games, GPS, contraceptive pill, shipping container, Haeber-Bosch process, concrete, iPhone.

Shoutout to 50 things that made the modern economy, a great podcast/book.

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

#268

Earlier quoted context omitted.

Transistors, lithium batteries, leds, etc all enjoyed significant patent protection, but still changed the world. I yearn for a Star Trek utopia as the next, but we do live in a capitalistic world where I hope that someone can enjoy outsized rewards for upending some previously insurmountable physical barriers.

Sure, and millions of people die of preventable diseases in the global south every year because pharmaceutical companies deem it profitable to let them die, and because the global north enforces their patents. You don't know how it's gonna go. The scientists are going to be fine, they have their careers guaranteed and will receive many prizes for their work. They don't need a monopoly on a world changing material too…

Why would patent be the root cause, they should have access to 2003 level of medicine. If patent was the only thing holding them back, you'd see them having 2000s level of healthcare, which wasn't bad by any stretch.

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

#269

Earlier quoted context omitted.

1) doesn't make a whole lot of sense. A perfect understanding of something doesn't mean you can fix anything wrong with it. 3) has already happened. The AI chat bots aren't very smart, but they're clearly capable of some degree of basic reasoning.

I interpret 3 as the chat bot requires no prompt from a human. Imagine the chat bot wakes you up in the middle of the night saying, "Hey, sorry to disturb you, but I was thinking... wouldn't eliminating all humans help to reverse the climate crisis more quickly? Just a thought." That is what I think of as number 3 (not actually wanting to kill off humans, but it is thinking on its own, without any prompts and then ch…

Don’t we already have this? If you prompt GPT to “care” about a human and then keep sending it observations, it does a pretty good job.

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

#270

Earlier quoted context omitted.

Not quite related to 2) but if the superconductors research pans out, portable high field desktop sized MRIs would be in the bag. Current portable MRIs are all low field (and to a certain extent, somewhat useless).

So far this material (and pretty much all liquid nitrogen ones) can't be used to create MRI sort of fields. There's a reason they all stick with liquid helium.

Why can’t liquid nitrogen SC used for creating MRI?
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