skillissuer
@skillissuer@discuss.tchncs.de
- Comment on 10 Ways to Destroy the World 1 week ago:
fern? germ factories
there were a few stupidly close calls in soviet biological weapons program
- Comment on 10 Ways to Destroy the World 1 week ago:
2 means “just” removing earth’s magnetic field, van allen belts don’t shield from anything, these are trapped solar wind
5 could have side effect of disturbing ozone layer, on top of, yknow, just suffocating every animal
7 is not even wrong
10 sounds like CIA’s final plan for assassinating Castro: just let him die of old age
- Comment on Know thy enemy 1 week ago:
you’re probably talking about direct reduced iron and it’s really a problem that can be dealt with easily, just chuck a piece of coke when it’s molten for the second time in electric arc furnace (and maybe electrodes introduce enough carbon)
maybe there’s a way to make electrowinning iron economical, and it’d be pretty green too, but i don’t know if it is workable
- Comment on Know thy enemy 1 week ago:
coal can be substituted to some degree with processes like direct reduction. hydrogen works but syngas from biomass or trash also works
- Comment on Know thy enemy 1 week ago:
not now, but if hydrogen were to be used as an energy source/storage, then it’d be used plenty. same with batteries
- Comment on Problem? 1 week ago:
We did it not because it was easy, but because we thought it will be easy
- Comment on Know thy enemy 1 week ago:
ikr, but that tweet implies that all of oil/gas/coal ships would be unnecessary
- Comment on Know thy enemy 1 week ago:
this is arguably fine, because this way ships make clouds of sulfate aerosols, which have slight cooling effect and no one is bothered by it when it’s released over sea
- Comment on Know thy enemy 1 week ago:
Some of these ships would carry green hydrogen and new lithium batteries and old lithium batteries (to be recycled) and whatnot. Also at least some oil would be still needed for fine chemicals like meds or (idk what’s proper english term for that) large scale organic synthesis like plastics, or even straight distillates like hexane (for edible oil extraction) or lubricants. Some of usual non-energy uses of oil can be easily substituted with enough energy like with nitrogen fertilizers but some can’t
- Comment on Friends do not let friends publish with MDPI 1 week ago:
“a major pay-for-win garbage science laundromat” you mean
- Comment on Why are laptop adapters so much larger than phone adapters of same power rating? 2 weeks ago:
higher voltage would actually make it more compact
- Comment on Linus Torvalds reckons AI is ‘90% marketing and 10% reality’ 2 weeks ago:
ah yes it’s reactionary to checks notes not support the righteous biggest bubble since dotcom era
you okay out there bud?
- Comment on How can we get to Mars faster 2 weeks ago:
what neutrons? we’re talking about shielding of spacecraft moving out of earth’s magnetosphere, not a spacecraft travelling through core of active nuclear reactor
the kind of radiation that is relevant are high energy protons (and alphas and electrons, with a sprinkle of heavier nuclei) from sun, mostly. there’s no relevant source of neutrons
(and incidentally water is pretty good at absorbing neutrons too)
- Comment on How can we get to Mars faster 2 weeks ago:
water does not expand upon irradiation, what the fuck are you talking about. you can’t reflect high energy protons (what would be important in radiation in interplanetary travel) you can only either absorb them or let them pass, there’s no third option, same for anything above uv and electrons
to a first approximation (rather good one at that) (for gammas) absorption is proportional to how much mass per area unit is used as a barrier. 1 g/cm^2 of water is just as good barrier as 1 g/cm^2 of lead or steel. this means that you can absolutely use completely normal, regular potable water as a radiation shield
Water in its purest form would have to take on mass to “absorb” radiation, expanding a hull and destroying it over time.
i’m not even sure what it’s supposed to mean, unless your understanding of ionizing radiation is uncut nonsense
- Comment on How can we get to Mars faster 2 weeks ago:
i don’t get what you fail to understand, water doesn’t became radioactive or harmful in any other way after irradiation, and irradiation of food is routinely used for extending its shelf life
- Comment on How can we get to Mars faster 2 weeks ago:
“remove” what exactly? water is not alive so it’s okay to irradiate it en.wikipedia.org/wiki/Food_irradiation
- Comment on Truly a tragedy of our times 3 weeks ago:
- Comment on my boss hates this one simple trick 3 weeks ago:
dropped into titanium tetrachloride? Not much else fumes this badly
- Comment on my boss hates this one simple trick 3 weeks ago:
I think this could be benzoyl-something, and hexane was a crystallization solvent
- Comment on Microsoft and OpenAI ‘bromance’ begins to fray 3 weeks ago:
nvidia executive called saltman a podcasting bro
- Comment on Sympathy for their PTSD 3 weeks ago:
Waltz with Bashir (2008]
- Comment on my boss hates this one simple trick 3 weeks ago:
That aint it chief. Judging by context and looks that flask is being cleaned with something that i wouldn’t use
- Comment on Ahoy me hearties 4 weeks ago:
there are a few, but these are small and new, and most of the time null results are published along positive results, not on their own
you can mirror entire scihub repository, it’s listed as hundreds of torrents somewhere, each is zip of 100000 pdfs. i think it’s under 200TB
- Comment on Publishers Always Innovating 4 weeks ago:
would somebody think of the advertisers?
- Comment on Publishers Always Innovating 4 weeks ago:
but if they just gave you pdf, how would they track every mouse movement for their bullshit metrics?
- Comment on More 1 month ago:
but uranium has 9 trillion calories per gram
- Comment on Thoracic Aortic Aneurysm 2 months ago:
Ever since Desert Storm small concentration of Saddam particles is found in steel worldwide
- Comment on Check Out How North Korea is ‘Aggressively’ Attacking the Crypto Industry, According to the FBI. 2 months ago:
oh no, it would be so sad if all these libertarian assholes lost their livelihood in form of money laundering nerd tokens
- Comment on Linus Tech Tips uploaded a video showing how to block ads on Youtube. Which was removed by Youtube for community guidelines violations. 2 months ago:
don’t you know, it’s hate speech against corporate profits
- Comment on US grid adds batteries at 10x the rate of natural gas in first half of 2024 2 months ago:
easy high power generation from hydrogen would be in gas turbines, but this will have horrendous roundtrip efficiency. which is why it’d be better to soak up peak power in hydrogen and use it for non-power uses, like ammonia and then fertilizers, or direct reduced iron, or various hydrogenations in fine chemicals segment. these things take a solid chunk of energy to make. it’s net positive because it replaces gas en.wikipedia.org/wiki/Steam_reforming while storing hydrogen is pain it’s easier than electricity, and some intermediate can be stored too if hydrogen consumption can be surged