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fullsquare

@ fullsquare @awful.systems

Posts
1
Comments
333
Joined
1 yr. ago

  • What's that discolouration on the silver spoon?

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  • this multicolored pattern looks like this because thickness of layer of whatever is comparable to light wavelength, mechanism is the same as in oil layers on water being colorful. it didn't spread from magnet, the layer is thinnest near magnet and becomes thicker near edges, which suggest it might be just dirt/oils that accumulated on it by contact. try wiping it with alcohol or acetone or what have you

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    How to request to take over community on lemmy.world ?

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  • i think that preferred contact is by matrix

  • What's the stupidest thing someone has ever done in front of you?

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  • he's either out of fucks, or knows exactly what he's doing

  • Will carrier drone and mesh nets be the coms of the revolution?

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  • drones can be also shot down and operators radiolocated very quickly

  • Will carrier drone and mesh nets be the coms of the revolution?

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  • no, because they have separate comms using completely different bands. esp when you're talking about military

    if you switch to different band, probably nonstandard and unlicensed, then there must be someone else to listen

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  • real. every prediction i got from computational chemists was wrong

  • World's largest particle accelerator begins warming thousands of local French residents with waste energy from the 16-mile Large Hadron Collider

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  • the waste heat comes from cryogenics system that keeps all of this helium at below 3K. turns out you need to spend a lot of energy to cool down things to temperatures this low

  • Telly has only delivered 35,000 of its free televisions with always-on ads

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  • if there was a way of faking presence of lower display, then you have free tv and extra screen

    this is some idiocracy level shit tho

  • A new cooling technology freezes food without warming the climate

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  • you can't turn a gas into liquid by compression alone if temperature is above critical point, you also need to cool it down. separation is done by fractional distillation, but the reason it's done is mostly about oxygen (medical and steelmaking among some other uses). for nitrogen it's somewhere about -150C. first air is stripped of water and carbon dioxide, then it's turned into a liquid, then it's separated into oxygen, nitrogen and argon, and some large specialized plants also separate xenon, krypton and neon

    if you don't actually care for it being a liquid, there's another method called pressure swing adsorption that separates gases based on how tightly do they bind to porous surfaces under pressure. this is how medical oxygen concentrators work

    making liquid nitrogen is pretty efficient these days, as in not much more energy is used than is actually needed

  • Anger as suspect in $100M jewelry heist said to be biggest in US history avoids standing trial – because ICE deported him

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  • yeah nah, you are a tool and talk like one, there's zero risk you're ever getting close to admission

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  • how many alts have you made today

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  • Ed Zitron on big tech, backlash, boom and bust: ‘AI has taught us that people are excited to replace human beings’

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  • shooting down bosses stupid ideas is #1 productivity tip for professionals (like most people on lemmy are)

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    can't change password for lemmy

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  • if everything else fails add matrix account to your profile (to have another communication option) and reach out to admin of your instance

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  • ‘All brakes are off’: Russia’s attempt to rein in illicit market for leaked data backfires

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  • as i understand, this is what bellingcat uses as a major source of data when reporting on russian activities

    “It is one of the paradoxes of modern Russia: on the one hand, these services are illegal and rely on leaked data, yet on the other, they are far more convenient for day-to-day police work than the multitude of official departmental databases,”

    gaben on piracy: "We think there is a fundamental misconception about piracy. Piracy is almost always a service problem and not a pricing problem,"

  • Grid-Scale Bubble Batteries Will Soon Be Everywhere

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  • There is a thermal energy storage included as s major part. This works because compressing CO2 to 55atm adiabatically heats it up to some 450-ish C, so that heat is pretty high grade, and only the final stage cools it down with heat exchanger open to air. In discharging direction, some heat is taken from outside air to evaporate part of CO2 and heat stored is used up

  • Grid-Scale Bubble Batteries Will Soon Be Everywhere

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  • compressors, turbines (like steam turbines), piping, some of which heat-resistant (500C), container for liquid carbon dioxide, lots of plastic for the bubble, something for thermal storage, dry and clean carbon dioxide, these aren't unusual or restricted resources, don't depend on critical raw materials or anything like that

  • Grid-Scale Bubble Batteries Will Soon Be Everywhere

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  • Compressed air without heat recovery is more like 30%, so this is huge

    Carbon dioxide can be liquefied relatively easily which is what i guess makes this efficient