471–480 of 906 posts
Earlier quoted context omitted.
> After skimming the paper, it reads like a legitimate paper even though I have zero expertise in the area. Ummm am I the only one who finds this line hilarious?
This whole thread is full of Dunning–Kruger victims misexplaining magnets to each other, this is pretty tame.
Guys, even if everything in this paper is true, the material as it is might have limited applications. From what they show, the critical field and critical current seem very low. 2500 Oe is like 0.25 Tesla. Even REBCO at 77K is >1T. And 2500 Oe is not even at critical temperature but much lower. From skimming through the article I couldn't find the sample size of the current measurement to get the critical current de…
I genuinely hate responses like this. For some reason, there’s a contingent of people that think that by poking holes and pooh-poohing things, it gives them clout. It happens far too often in tech and I hate it. Look how often the post has “can’t” or “couldn’t”. Instead of giving reasons why something sucks, how about being supportive and talking about why it’s awesome and what possibilities this opens up?
High temperature superconductors are not likely to be useful as powerful magnets, but they can be useful for almost everything else.
Earlier quoted context omitted.
>As far as I know, that’s possible with permanent magnets (and it would be weird, but not impossible, if the group instead synthesized a novel ferromagnet and didn’t notice) As far as I know a stable arrangement of permanent magnets levitating is impossible without a baring surface to keep them aligned. (i.e. free floating levitation is not possible without active control)
That's not quite true. There is a Halbach array with a bunch of compensation coils that will nicely center as long as it is moving, no active control or bearing required. https://www.sciencedirect.com/science/article/abs/pii/S03048... And many others besides. Halbach arrays are fascinating.
Guys, even if everything in this paper is true, the material as it is might have limited applications. From what they show, the critical field and critical current seem very low. 2500 Oe is like 0.25 Tesla. Even REBCO at 77K is >1T. And 2500 Oe is not even at critical temperature but much lower. From skimming through the article I couldn't find the sample size of the current measurement to get the critical current de…
I genuinely hate responses like this. For some reason, there’s a contingent of people that think that by poking holes and pooh-poohing things, it gives them clout. It happens far too often in tech and I hate it. Look how often the post has “can’t” or “couldn’t”. Instead of giving reasons why something sucks, how about being supportive and talking about why it’s awesome and what possibilities this opens up?
Edit: I appreciate you toning down the more combative part of your comment.
big if true. far from a chemistry expert here, but synthesis looks basically trivial (if you consider 10e-5 torr vacuum to be trivial), and the materials are readily available. hell, from the instructions alone i could probably make it at home. i mean the search space is unfathomably large, so i suppose it’s possible that something like this exists, but the paper quality itself doesn’t.. spark joy? :) i’ll maintain a…
> if you consider 10e-5 torr vacuum to be trivial Its not hard to achieve at all. Electron beam welders at work have 1E-6/1E-7 in the E-gun chamber all day long held by a little turbo or diffusion pump. The chambers aren't made from anything exotic just stainless steel and/or aluminum with viton o-rings. My little e-gun experiments are all done with a Alcatel Pascal 2008 and I can achieve ~3E-3 with just that pump. I…
Earlier quoted context omitted.
What are the failure modes for a superconductor MRI? Could it cause a resonance cascade?
Sign me up, I'd like to be one of the biped critters with giant mouths on their stomachs. Short pipeline, very efficient.
Earlier quoted context omitted.
Please don't blow the lead smoke over to your neighbors house though
Seriously, people should stop panicking about lead that much. You know there is this fairly common hobby people have, it's called casting bullets. With lead. I've done it, I know many people that do it regularly and they're all fine. Furthermore, shooting ranges are full of lead in the ground. The laws around here(Poland) require a cleanup by specialised companies every few years and a concrete slab to separate the l…
So don't blow lead smoke over your neighbors house.
Earlier quoted context omitted.
They've just proven (if true of course) that it's possible at all. That is a massive, massive leap. And once it's possible, it won't be long until it's optimized. We've seen this everywhere -- transistors were once huge and now nanometers; solar cells have improved in every where; batteries are cheaper and better than ever.
I was with you on the first part. If this proves room-temperature/ambient-pressure is possible at all, that is huge. Not so sure about the "won't be long until it's optimized," though. There are a lot of examples where something seems perpetually 20 years away. I'd advise tempering the transistor-based optimism with just a skosh of fusion energy skepticism.
Just thinking about the possible applications for storage makes me dizzy. Fingers crossed.