251–260 of 501 posts
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>I would say they are not faking it, but instead they just don’t understand what they are looking at What? How do they get funding and lab space if they can't read their own measurements? Something is fishy here.
They in fact could not get funding and the research is funded by investment money. They explicitly thank their investors at the end.
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I'm assuming they mean the balance mechanism, and specifically what allows us to balance. How much is it the rider shifting their weight, how much is micro steering adjusts as we move forward, how much is the gyroscopic forces of the wheels, how much of it has to do with the angle of the handle bars to the wheel verse the center of weight. That said, I'm guessing this one is well understood by experts, but more compl…
I wonder what learning the specific system by which bikes are balanced would teach us about the world or human beings? It's such a banal thing to be so fascinating.
The smart phone is the culmination of understanding a million facts about materials sciences (applied and theoretical), some of which were obvious, some of which were non-obvious. Starting from a transistor you could see from across the room down to ones you can't even see with a magnifying glass.
New scientist got a reply from the authors and a few other experts: https://www.newscientist.com/article/2384782-room-temperatur... >Kim has only co-authored one of the arXiv papers, while the other is authored by his colleagues at the Quantum Energy Research Centre in South Korea, some of whom also applied for a patent on LK-99 in August 2022. >Both papers present similar measurements, however Kim says that the seco…
While we’re waiting for experimenters to reproduce this, it’s worth comparing this amazing announcement to the Cold Fusion affair of 1989[1] It’s notable that the first publications about attempts to reproduce the Cold Fusion experiment all reported positive results. It’s probably because experimenters who got negative results decided they might have done something wrong so they kept trying, and delayed, and they did…
Why did those early experimenters report positive reports? Did they inadvertently do something wrong themselves that looked like cold fusion?
* people looking for fusion neutrons, who did not have much experience with the finickiness of neutron detectors and who reported seeing them when they were getting experimental errors, and
* people looking for excess heat, which was simply inherently difficult to measure accurately.
On the other hand, there wasn't a publication delay for the negative reports; within a week the groups started talking to each other and realized they weren't unique in not finding anything.
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Why did those early experimenters report positive reports? Did they inadvertently do something wrong themselves that looked like cold fusion?
IIRC, there were two groups of groups working on it (the process was simple enough that a description from the press conference was enough to get started): * people looking for fusion neutrons, who did not have much experience with the finickiness of neutron detectors and who reported seeing them when they were getting experimental errors, and * people looking for excess heat, which was simply inherently difficult to…
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A 4-point measurement of an insulator would show zero current, as far as I know. A more plausible idea IMO is that it could be a 4-point measurement of a highly inhomogeneous sample. If the current probes make contact with conductive parts of the sample, and there is a conductive path between them, but one or both voltage probes are not contacting the conductive path, then the voltage measurement would be garbage and…
Wouldn't it be odd for an amalgam of lead and copper to be non-conductive? I know they were formed from sulfur compounds, but the production process should have eliminated those compounds, and the final forming is done in a vacuum so there shouldn't be any oxide generation to form non-conductive barriers. I don't know much about the process but shouldn't they be testing resistance in a superconductor?
One odd thing that I've not seen any discussion on: the reported heat capacity of LK-99 decreases above 250K, which is pretty atypical. Has there been any commentary on that?
> Has there been any commentary on that? German, but nevertheless: http://blog.fefe.de/?ts=9a3f8740 "I work in the field [...] we don't believe a word of this. [...] The data set in Fig. 4(b) is also a treat. It is VERY unusual when the heat capacity decreases again at high temperatures. This can happen at low temperatures, but not at high temperatures. [...] My personal assumption is that the authors measured an ins…
Raise your hand if you contacted Aldritch about the two pre-cursor materials :-) This is an excellent summary and like Derek I have high hopes (but low expectations) that by the end of this week we'll see some tentative confirmation. This stuff isn't particularly hard (or expensive!) to make so that should really make for interesting news and some very fun products if it is proven out.
The bigger the impact the more of a splash it will make in social contexts consequently we see a lot of blatant and cautious naysayers with various explanations and individual explanations for the logic of their refutation.
But it’s If it’s shocking enough, groundbreaking enough, anyone with the expertise to try will do so either to see if it’s right instead of waiting around for someone else to do it and write it up and publish it, or to prove that it’s not and for something this big at least, give BobbyBrocolli a new possible video topic to consider.
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Room temperature superconductivity does not help with quantum computing. The transmons or atoms or ions need to be cold so that they do not get "flipped", not because of the need for superconductors.
Do quantum computers not have a need for strong magnetic fields? Or is the magnetic field requirement weak enough that it can be serviced by non-superconducting magnets?