i think that poking a pressurized vessel is a bad idea in general, whether it is attached to a hostile robot or not. it’s gonna be LOUD and perhaps throw fragments, or take way longer than practical depending on what it was made from. (what if only one of two is damaged?) there are so many things that can go wrong with the alleged failsafe (what if pressure drops slower than designed?)

nfc tag and card might try to transmit at the same time that’s why it’s asking to remove it

“individual researchers with bold ideas” will mysteriously turn out to be republican techbros

there are still coal powerplants around and any replacement is better. geothermal doesn’t work everywhere

(pref sea water)

doesn’t matter because you have to purify it anyway

direct hydrogen uses that make sense given hydrogen is cheap are ammonia, methanol (also from biomass), steel and generally speaking fine chemicals. methanol and ammonia can be used as fuels for cases where BEVs don’t work, like shipping. this also requires monstrous overbuild of power grid

prerequisite for cheap hydrogen (cheap electricity) will also make further electrification make sense and that eats lunch of hydrogen use for power even before hydrogen infra buildout happens

Coal ash (from some mines) contains so much uranium that if emissions like this were detected near NPP all hell would break loose, but nobody cares. Energy content of that uranium can be higher than what was released during coal combustion

for hydrogen propulsion to make sense prerequisite is to have lots of cheap green hydrogen, which mean very cheap renewable electricity, by which point there’s no need because electric cars are more direct replacement. but there are applications where hydrogen is used directly, as a reagent instead of as energy source and can be made from renewable electricity. Yara makes some of fertilizer this way and there’s a pilot plant for green steelmaking in sweden iirc. it just so happens that now cheapest hydrogen is made from gas

this also pulls in different directions because people building renewable generation don’t want electricity price to be too low

sounds like he took the hedge part out of hedge fund, and then margin call took out the fund part

it replaces gas turbine with a fuel cell, which is a good couple % more efficient than CCGT. still under development. there is also another variant where hot offgas is generated under pressure and expanded directly. no steam, same effect

Could be. Amplifiers are a bit more complicated and there are many things that can limit bandwidth

there is a power generation scheme that uses high temperature fuel cells. optimally it could run on hydrogen only, but because it runs hot, it is able to take almost any flammable gas, along with some steam, and it forms hydrogen internally, then oxidizes it. this alone generates bulk of electricity, but offgas is hot, so it goes to heat exchanger which boils water, which then turns steam turbine

but you see, in case of accident they can just dump reactor core into seawater which will provide ample cooling and shielding. no biggie, just put multi thousand ton object that requires a village of engineers to work out on high seas

there are normal nuclear powerplants that use seawater as coolant and they’re all on shore. these require a lot of corrosion resistant heat exchangers along the way. there is one power barge like this, it provides power to russian far east, whole 70MW of it, costed 414 million dollars and needs 300 people onsite. your guess is as good as mine how many of them are military. 70MW, aka two or three aeroderivative gas turbines

If we consider groundplane antenna, which should be much better than anything that you can fit on a HT, it might be centered on 145MHz (region 2 band) and it’ll be good for 10MHz for 1:1.5 SWR (140-150) and 17MHz for 1:2 SWR (136.5-153.5) according to some random measurement, first that i found. Outside of these ranges SWR rises rapidly and if you tried to transmit on say 170MHz you might get SWR 1:5, perhaps 1:10 or worse if you’re unlucky. On receive this doesn’t matter too much because these nano- to microwatts of rx power would just bounce back harmlessly with the only effect being that apparent signal strength is lower. But if you tried to transmit then design currents or voltages would be exceeded and something will break, usually final stage of amplifier. This gets rarer than it used to be because some radios can measure SWR and will reduce power in such scenario. This also gets worse the higher transmitted power is

This happens because unlike on HF + 6m, on 2m and up ATUs are not a thing* and all antennas are expected to be matched. So you can use the same radio on GMRS or PMR or what have you and on 2m or 70cm band, but you have to change antennas between these uses. If you want to use all of these on one antenna, then there are special wideband designs like LPDA but this makes sense on a mast and not on handheld radio

* there are tuner designs that work on 2m and up, but you won’t find them in HT, there’s no point, they’re too big, too heavy and too expensive

Even if you tried and made it to work, there might be other incredible problems with things like harmonics or other spurious emissions because filters were not designed to work way out of these frequencies. For example you can try to force Quansheng UV-5K (?) to transmit on 60-ish MHz but most of the power goes out at 2nd and 3rd harmonic, because of the way filters were set up. Narrowband designs are much easier and this is what you’ll see all the time in amateur radio. Wideband and ultrawideband designs are constant source of job security for RF/microwave engineers

You can think of matching units and antennas (and to some degree even feedlines) as filters to some degree, because their bandwidth is not infinite

Note that there’s 25% of fractional bandwidth in there and many antennas won’t work everywhere in that range (and also other elements like power dividers, diplexers etc if part of circuit)

if it’s that thick, i expect it’s some kind of pharmaceutical dissolved in oil. over time oil, like sesame oil, will gum up and darken like this

hexbear userbase are tankies/campists with extreme brigading habit, this is why many instances are defederated from them. including this one

mods of a comm that has “fuck tankies” in tagline have a vote and agree to remove a tankie mod. there are receipts and entire post prepared in advance

at the same time said mod is removed as admin of a couple of matrix rooms. said mod is also db0 admin and seems to like leftist unity as long as it’s done her way only. three hours later she wakes up and her next move is to grab another, completely unrelated community and to move instances from blahaj to db0, a community where she was inactive as a mod for months, specifically so that it would be exposed to hexbear. we all know it works very well. it seems like this move was talked about with db0 admins but not other mods of said community.

this doesn’t go as intended, blahaj admin steps in and removes that mod from there too. the new community on db0 is also removed, which is something that can be only done by admin, presumably some other db0 admin. then said mod makes second big post, calls blahaj admin a reactionary, steps down as a db0 admin (“voluntarily”, somehow i doubt that), moves shop to hexbear (?)

It’s lowkey expected considering how hard it draws from self-help movements

related phenomenon. at calm solar surface, there’s only hydrogen and helium. these are excited thermally and can emit radiation, but the highest energy photon they can emit is ca 13eV and 52eV respectively. this is vacuum UV, and this is what is responsible for ionisation of ionosphere even during solar minimum, mostly F layer. but when solar flare forms, there are these giant loops of charged particles, and when charged particles change direction or brake, they release a lot of high energy radiation, that is xrays. xrays just go everywhere and this is partially what is responsible for extra ionisation of ionosphere during solar maximum, and this contributes more to E layer ionisation. (because xrays can go further through air) when solar flare hits the earth, protons from it cause extra ionisation in D layer and this is why post-flare blackouts happen

this is also why one metric of solar activity is solar xray flux

there are also solar xrays, which also ionize ionosphere and are associated with CMEs (regular processes on surface of sun cannot make much xrays, it’s only when high energy particles are smashed back at the surface xrays are emitted. intense magnetic fields are needed for that)