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fullsquare

@ fullsquare @awful.systems

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333
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1 yr. ago

  • Scientists Make Water-Based Battery That Could Last 300 Years Using Tofu Brine Ingredients

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  • 4-5V is state of the art and pushing it there or beyond that gets very tricky very quickly. pure water has electrochemical window of 1.23V, but you can go a bit over that because at low overvoltage water splitting is slow at most electrode materials. that's why lead battery can have 2V per cell and will generate hydrogen when charged much over nominal voltage

  • Scientists Make Water-Based Battery That Could Last 300 Years Using Tofu Brine Ingredients

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  • storage of heat is also very cheap compared to some other options and can just be using ground around boreholes, especially considering that most of residential energy use is in form of heat. if you have a hill that you don't need you can even put an artificial lake on top of it

    there's a speciality resin (that new material) in that battery. resins are nonrecyclable. i don't think it can be 4x cheaper per kg than LiFePO4 battery because of that material

  • Scientists Make Water-Based Battery That Could Last 300 Years Using Tofu Brine Ingredients

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  • some of you people itt have never imagined that there could be something like a research dead end and it shows

  • Scientists Make Water-Based Battery That Could Last 300 Years Using Tofu Brine Ingredients

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  • use of water as a solvent limits maximum voltage

    wanted to use water to get electricity anyway for a laugh? we have a tool for that: it's called STEAM TURBINE

  • Scientists Make Water-Based Battery That Could Last 300 Years Using Tofu Brine Ingredients

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  • or you could go with sodium battery, or LiFePO4, or thermal energy storage at this scale. hell maybe even pumped hydro

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  • if you do that you have bigger problems

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    Weird and Useless Japanese Inventions That Many Secretly Need

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  • just put butter in the toothpaste tube smh

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  • only if you take notes

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  • this advice is specifically about sulfuric acid. it's denser than water, so if added to it it will sink diluting itself along the way, while also heating water around and making it float to the surface. if done opposite way, water won't mix immediately because of large density difference so neutralizatio heat will be deposited on surface between these two boiling water and throwing acid around. this matters less with other acids because less heat is deposited, and in some cases acid is less dense than water. but if you stir the acid quickly, you can do it either way as long as you control temperature. this also is the case when you need to mix two different acids

    tldr you can do whatever you want as long as you know what are you doing

    e: i've checked and heat of dilution is greatest for sulfuric acid, liquid HF is similar per gram, gaseous HCl and HBr are half of that per mol, other common acids 5-10x less esp as aqueous solutions and not neat. also the same happens when diluting acids with other solvents, like alcohols or ethers, these might be even worse because they boil at lower temperature

  • Meta Is Dying. It’s About Time.

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  • speaking of oracle, they recently loaded up on debt and got into deals that are all but impossible to fulfill, and in a couple of years their survival will depend on openai making profit. (not revenue) put a pin in it and come back to that in a year or three

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  • the steam part is in the rest of hydrological cycle

  • Why AI companies want you to be afraid of them

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  • Altman has been claiming chat gpt made him feel dumb since 4.5

    perfectly believable tbh

  • Stealth Satellite TV Defeats Iran's Internet Blackout

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  • that mmwave radar would have to be attached to a drone, because their manned aircraft are unbelievably obsolete. it means smaller size meaning low resolution, and as starlink emits pinpointing them would be very easy when active, much easier than any passive sat dish, and starlink is still in use. i've seen some advice on hiding starlink that includes turning off starlink wifi and using wired connection, because irgc is looking for 2.4 ghz signal (from ground?) and not for 14-ish ghz uplink, so they probably dont have a lot of flying ew/radars

    i'm not saying that iranian air force has definitely none of that, but i would be decently surprised if they do have more than 2

  • Stealth Satellite TV Defeats Iran's Internet Blackout

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  • there are ways. for example, put a fake hot water barrel on the roof, made from fiberglass or polypropylene or what have you, but not metal, and put dish inside, or in any variety of inconspicuous containers or boxes made from plastic or wood or fabric. some other antennas can be camouflaged as fake chimneys or gutters or water piping or many other things

  • Copy Fail: 732 Bytes to Root on Every Major Linux Distribution. - Xint

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  • Copy Fail: 732 Bytes to Root on Every Major Linux Distribution. - Xint

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  • patched month ago

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    US government pays $900 million to exit wind projects

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  • quixotic, even

  • A new liquid battery stores solar heat for weeks

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  • Stirling engines are woefully inefficient tho, PV panels are better unless you're intending to supplement heat source with biomass or such. In a climate where most of energy is used for heating and little to none on AC, it just makes more sense to use solar collectors instead of PV because most of energy use will be in form of heat anyway, and per square meter collector will deliver much more. If you can couple excess heat production to seasonal energy storage, this gets you most or all of heat needs year round covered by solar, if you don't there's still free hot water in the summer and seriously lowered gas bill through the year. Small PV panel might make sense to keep pumps running or cover some of the rest of needs but won't shift balance heavily either way. In a place where major use of energy is AC this approach makes no sense and PV panels with daily or a bit longer lasting storage of energy, be it in batteries or thermal (tanks of cold glycol or ice or whatever) would be the way to go, because the most sunny day is also the day when you need AC the most and this way you get most of your energy needs covered

  • load bearing worm

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  • i heard a story about varnish factory that failed quality checks after one old guy got fired, he was a smoker and used to spit in the main reactor. some enzyme from saliva made it shinier