A room-temperature superconductor? New developments

Post by kragen » Wed, Aug 02, 2023, 2:28 AM UTC

dlivingston wrote: post #435

cududa wrote: post #340

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Yes and many of them are completely wrong. I keep seeing people saying "CPU's that don't generate heat". How exactly would that work? When a transistor turns off/ switches to 0, where does it dump the electrons? Hint: into heat

Sorry, can you explain? My understanding is that transistors don't "dump" electrons anywhere. The gate controls the voltage, which in the `0` state forces resistance to be high enough s.t. current flow through that transistor stops. As the Veritasium video explains [0], current flow is not a literal flow of electrons, but a state of the electromagnetic field (or something to that effect... it's been many years since…

Post by [deleted] » Wed, Aug 02, 2023, 2:35 AM UTC

jrockway wrote: post #547

derefr wrote: post #432

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Resistance is what makes things hot, and heat is what makes dumping huge amounts of charge current into batteries a bad idea. No resistance → no heat → no need to charge with low current†. Another way to say it is that, with a superconducting wire, you can make the wire as thin as you want and still pass the same amount of current through it, without melting the wire. Picture using a USB-C cable to charge your car. †…

There are many things that seem like electrical resistance but are different phenomena. Capacitive reactance, inductance, "radiation resistance", etc. Superconductors don't prevent any of these effects. But, these effects are usually smaller than ordinary resistance.

Post by birdyrooster » Wed, Aug 02, 2023, 2:38 AM UTC

birdyrooster wrote: post #373

ajuc wrote: post #335

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Japanese and South Korean increasing technical prowess didn't, why would Chinese be any different? China has serious fundamental problems and if you account for its gigantic population - it's seriously underachieving not only compared to US, but even compared to the rest of the developed world. It's fashionable to talk about China taking over, but it's far from guaranteed. China is pretty much confirmed to be falsify…

> It's fashionable to talk about China taking over It's not so much fashionable as it is literally state propaganda used to try and shoulder its way into the South China Sea and the Pacific by claiming it is so prosperous and populous that it is entitled to increasingly large sphere of influence and direct control.

Post by throw10920 » Wed, Aug 02, 2023, 2:43 AM UTC

objektif wrote: post #181

ta1243 wrote: post #53

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Everyone with half a brain in the US is working the ad-tech and data-mining industries, that's where the money is.

[flagged]

Post by cthalupa » Wed, Aug 02, 2023, 2:54 AM UTC

kragen wrote: post #690

kbenson wrote: post #394

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There's a wide space between "can be recycled" and "profitable enough that there's theft for base components that can be resold". That doesn't mean it won't be profitable to harvest the gold (I don't know), but one does not imply the other. For example, paper recycling is profitable when centralized (barely), but even that's with most the pipeline subsidized, and it's not profitable to the degree that people are stea…

paper recycling is profitable without any subsidies at all, and people do sometimes steal paper to recycle it here in argentina there are tens of thousands of people who make a living by recycling, sorting through whatever trash they can get access to in order to find materials with enough resale value to scrape by. they haul plastic sacks or two-wheeled carts all over the metropolitan area, stacking them high with r…