481–490 of 821 posts
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It would be sub-10%* gold content. We're talking about gold doping, specifically substitution in the Pb(1) site, not an alloy. ETA: I was off by an order of magnitude (originally I said sub-1%) because the doping is extensive, and the mass of the lead/gold is a dominant fraction of the total. The formula given in the paper is (subscripts in brackets): Pb[10−x]Cu[x](PO4)[6]O with 0.9 Similarly for Au we would have Pb[…
Having to handle lead for a practically unretrievable amount of gold would (I hope) be enough of a deterrent for the vast majority of "citizen scrappers". Worst case, I think a Pb/Au scrap grey-market would look something like the current catalytic converter market, where raw materials are purchased at set rate by an intermediary and then sold for further processing. Most people know there's gold in their computer pa…
The ramifications of the inflection point we are currently at is mind boggling. I had a hard time explaining this last night but we may very well be witnessing the beginnings of a technological transformation era much like when the p-n junction was invented. From the 1940s standpoint it would be hard to envision all we had today. - Lossless transport of energy - Batteries that don't take any time to recharge - Faster…
I ditto the sentiment. But we don't want literal flying cars. Well, self driven flying cars. Humans have enough problems when they're driving on the ground on ground made for driving.
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That's not going to produce a 20x gain in efficiency. The primary problem with electric cars is energy density in the battery itself. Maybe if mag-lev cars are possible, you could get that kind of gain from the reduced friction.
If your loss goes from 5% to 1%, you have to deal with 80% less heat. So you can make 3x smaller motors. All the powertrain of these machines will be hugely simplified. That's no small deal, but in the grand scheme of things that a hot superconductor can give us.. I mean, this can (possibly, with decades of research) give us fusion, quantum computing, etc.
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Hang on, wouldn't a sliver of any magnetic material behave like this within a moving magnetic field? This replication is a fail, yes?
Neither lead nor copper are what we would normally consider a "magnetic material" like iron. That it interacts strongly with a magnetic field shows that a big change in the material, consistent with superconductivity, has occurred. Quantum level effects are newly appearing in the macroscopic world, and that's always interesting.
The ramifications of the inflection point we are currently at is mind boggling. I had a hard time explaining this last night but we may very well be witnessing the beginnings of a technological transformation era much like when the p-n junction was invented. From the 1940s standpoint it would be hard to envision all we had today. - Lossless transport of energy - Batteries that don't take any time to recharge - Faster…
Let's not forget the flying skateboard of the film "Back to the future". I loved it in the film and it's a dream that I still have today - I'm now almost 50 years old so I would probably crash and get killed by using it, but I would still give it a try :)
The ramifications of the inflection point we are currently at is mind boggling. I had a hard time explaining this last night but we may very well be witnessing the beginnings of a technological transformation era much like when the p-n junction was invented. From the 1940s standpoint it would be hard to envision all we had today. - Lossless transport of energy - Batteries that don't take any time to recharge - Faster…
> Much faster with no heat to burn your lap. Computation inherently creates heat, that's not something that superconductors will change.
[1]: https://spectrum.ieee.org/the-future-of-computing-depends-on...
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Levitates? Against, what, the earth's inherent magnetic field? Sorry, I haven't seen any visuals that show this behavior.
Levitation in magnetic itself is not the proof. Frogs can do that too, ask Geim. The proof would be levitation in any orientation.
After that replication of production of LK-99 would of course be critical, but just proving it exists should alone be enough for grand celebration.