JATtho

@JATtho@lemmy.world

• ⁨Comment⁩ on ⁨Weak ah bih⁩ ⁨⁨1⁩ ⁨week⁩ ago⁩:

  Also, a free neutron decays after 608 seconds with 0.782 MeV blast into stable proton, electron and anti-neutrino. The more know…

• ⁨Comment⁩ on ⁨It's actually that simple.⁩ ⁨⁨2⁩ ⁨weeks⁩ ago⁩:

  You all disgust me.

• ⁨Comment⁩ on ⁨what’s your best “nitric acid acts upon trousers” moment?⁩ ⁨⁨2⁩ ⁨weeks⁩ ago⁩:

  Put some lye and aluminum foil in a cup without a handle.

  Place a can over the cup with a small hole.

  Wait a bit.

  Light the hydrogen.

  It will also hurt a lot if your finger is on top of the can when you light it because the can will simply dissapear for few seconds.

• ⁨Comment⁩ on ⁨I would like to play a calm game⁩ ⁨⁨2⁩ ⁨weeks⁩ ago⁩:

  I enjoyed Portal because I had to plan out what I’m doing before I act (without being pressured to act), the atmosphere of the game was legendary and I liked that little robot following me

  Portal 2 has two community made “Valve Quality” DLCs. “Portal Stories: Mel” and “Portal: Revolution”. Mel seems playable on macOS at least. Revolution is basically a Portal 2 presequel. (It’s also so long I would have payed for it.)

• ⁨Comment⁩ on ⁨Sick of this shit⁩ ⁨⁨2⁩ ⁨weeks⁩ ago⁩:

  I’m a hobby software developer and a fan of reading a lot of about physics. To me, “alpha” means an highly unstable configuation with massive amount of over optimistic excitement and just one wrong nudge will have catastrohic emmission of high energy photons and sounds. But it all decays away eventually and reaches stable state. xD

• ⁨Comment⁩ on ⁨WTF is this???⁩ ⁨⁨3⁩ ⁨weeks⁩ ago⁩:

  I once asked a friend to what common technical fault (motor, bearings etc.) bmw cars usually start breaking. “Usually, BMWs are rolled around lightposts in the winter, so they never really break.” Was his answer. I’m still gobsmacked of his honesty. xD

• ⁨Comment⁩ on ⁨It works better if you put it in your mouth first.⁩ ⁨⁨2⁩ ⁨months⁩ ago⁩:

  You forgot the /s at the end.

• ⁨Comment⁩ on ⁨Slingshot is a nice detail 😁⁩ ⁨⁨3⁩ ⁨months⁩ ago⁩:

  This just a lovely comic, so have a double up vote.

• ⁨Comment⁩ on ⁨Anon goes to therapy⁩ ⁨⁨4⁩ ⁨months⁩ ago⁩:

  You should see the finnish system… there is no therapist on sight to point of being illegal by basic constitutional rights, and still nobody bats an eye nor do you get any treatment that helps.

• ⁨Comment⁩ on ⁨Banan⁩ ⁨⁨4⁩ ⁨months⁩ ago⁩:

  Good, so the bland cavendish will never die and we actually learned something from the first mass-extinction event of more flavorful bananas. (the old more flavorful essence of the dead variety is still fckn. everywhere.)

• ⁨Comment⁩ on ⁨What a great idea⁩ ⁨⁨4⁩ ⁨months⁩ ago⁩:

  Just try find and track the price per kg of a good, and you are in deep shit. Its some times hidden, after several “get the app”, “two for one” just to find out the good is fucking more expensive if you refuse go though the privacy invasing hoops. What the fuck happended to “Limited time offer until this actually cheap batch is sold out!”

• ⁨Comment⁩ on ⁨Alchemy is so hot right now.⁩ ⁨⁨4⁩ ⁨months⁩ ago⁩:

  You have seen the equations? 99% you don’t get anything useful or somehow split the fucking universe, so that time-reversed flow of information won’t break the causality. (And it fucking does break the universe, the local bubble we are in. Please, don’t google false-vacuum.) We don’t even know the speed of light in one-direction, because information travels at the fucking speed of light, whatever that it. Yet, you measure a spin of electron, and the other fucker in the opposite side of the universe, is known to be opposite in the instant.

  The action is minimized by nature, in one way or other, even if this means punching a hole in the space-time continuum, to start a tree-of-universes descending from the host.

  /s (I had enough beer for today.)

• ⁨Comment⁩ on ⁨Alchemy is so hot right now.⁩ ⁨⁨4⁩ ⁨months⁩ ago⁩:

  I don’t know, if you gather one proton’s and two neutrons worth of energy, localized entirely within the supposed space of an atom, you could generate mass from energy. However, what that energy converts into, is entirely random, so I would guess most of the time you just get realllly high energy photons out of it.

• ⁨Comment⁩ on ⁨Alchemy is so hot right now.⁩ ⁨⁨4⁩ ⁨months⁩ ago⁩:

  arxiv.org: a pre-print source, this is not peer-reviewed yet. So, until other papers refer to this paper, it has low significance in the literature. The paper has references to other papers and to previous corpus of knowledge on the subject, which is good. However, this paper is based on simulations only.

  Crucially, the scheme identified here does not negatively impact electricity production, and is also compatible with the challenging tritium breeding requirements of fusion power plant design because (n, 2n) reactions of 198Hg drive both transmutation and neutron multiplication

  Monte Carlo transport calculations show that neutrons produced in a tokamak power plant can convert the abundant isotope 198Hg to stable 197Au via the (n,2n) channel, yielding several tonnes of gold per plant-year without compromising the tritium breeding ratio.

  The decommissioned blanket material would increase in value, and the Mercury-198 in the blanket doesn’t majorly impact its effectiveness in transmuting lithium to tritium.

  The “worst” gold isotope half-life is less than a year, so only a modest cool-down is needed for the output:

  197Au to be Class 7 when activity concentration is > 2700 pCi/g, which is reached after 13.7 years for the initial concentration listed.

  An even more stringent constraint can be applied for any gold that will be regularly handled by the general population. As a highly conservative requirement, we can stipulate that this gold must be less radioactive than a banana. Due to 40K content, bananas have an activity of ∼ 3520 pCi/kg, or about 420 pCi for a single banana. To meet this requirement, a troy ounce of gold with the initial isotope mix shown in Table 2 must sit for about 17.7 years to be below a banana equivalent level of activity.

  What strikes me here with this paper is the suggested liquid blanket, so this would be a kin of D-T Fusion MSR. We now have two proposed technologies behind being able handle hot radioactive liquids.

• ⁨Comment⁩ on ⁨genius⁩ ⁨⁨4⁩ ⁨months⁩ ago⁩:

  This is a kind of part you want a single metallic-crystal of… anything less would we subpar and jesus. So no uncontrolled cooling of the cast for you. (or the rotor can decide this is a good day for a extra slow spin and no-flight.)

• ⁨Comment⁩ on ⁨same shit every day, on god⁩ ⁨⁨5⁩ ⁨months⁩ ago⁩:

  Fresh PWR fuel is ~4% U-235 and the rest is non-fissile uranium/cladding. ~95% of the potential energy still locked in the “waste” after spending ~2 years in the reactor. Breeder reactors would mean converting greater fraction of this mass into usable energy.

  Running PWR core has be at +150 Bar to have +300*C outlet temp - so if something goes wrong it goes wrong like Fukushima. The fuel can stay in the core only until economics say running the plant at less than 100% design power isn’t profitable. Every 18/24 months the plant is needs to shutdown for maintance few a weeks to months. I don’t like PWRs.

  “regular, i.e. non-breeder” MSRs that would just use uranium would be a massive improvement - both in safety and efficiency. Heat a massive silo of (secondary coolant) salt to +500*C with MSR, do the reactor repairs while this reserve runs the turbines, resume MSR. The issue is - politics, fear, and too little research in handling molten salts.

• ⁨Comment⁩ on ⁨same shit every day, on god⁩ ⁨⁨5⁩ ⁨months⁩ ago⁩:

  You should look at mitochondria:

  • The power plant of the cell.
  • Runs on a proton-gradient.
  • ATP synthase is essentially a molecular turbine and a generator.
  • oh. a turbine. Damm thing spins ~18000 rpm at medium throttle, pumping out elec- ATP. ATP.

  Oops… it’s turbines all the way down.

• ⁨Comment⁩ on ⁨same shit every day, on god⁩ ⁨⁨5⁩ ⁨months⁩ ago⁩:

  The scientists didn’t joke about that tokamaks will be a great neutron factory/highest neutron flux available. Yes, neutron activation of the reactor walls/components is a problem that we need to solve. However, transmutation of lithium to tritium is required for the reactor to work in the long term, so having a high neutron flux source is a plus in this regard. (and a negative in all aspects of structural integrity…)

  The volume amount of activated material that would come out from tokamaks is fraction compared to the literal tens of tons half-burnt uranium that takes way too long to decay to safe level. The more angrier the radioactivity, the less time it takes to decay away.

• ⁨Comment⁩ on ⁨⁩ ⁨⁨6⁩ ⁨months⁩ ago⁩:

  I have heard that Windows tends to ‘nuke’ the EFI boot partition if it’s shared with Linux. I’m not sure if it’s valid to have two EFI partitions on the same disk, but if the box can handle a second EFI boot partition, that would be a safer option.

  There is also the issue that normal windows shutdown does not mean shutdown, but “hibernate”. In this state, touching any of the partitions the windows was previously using could corrupt them if mounted in Linux. (The same applies in reverse, and would be even more dangerous.) This doesn’t prevent dual-booting, but some care should be taken that the swiched-from-OS was actually shutdown.

• ⁨Comment⁩ on ⁨forbidden dots⁩ ⁨⁨6⁩ ⁨months⁩ ago⁩:

  Be in one fraction at once. H2O consist of differerent quantum-mechanical portions: para-water and ortho-water.

  And it only gets weirder.

  paljastus

  No. Don’t google para-hydrogen. You will break your brain.

• ⁨Comment⁩ on ⁨It's important!⁩ ⁨⁨6⁩ ⁨months⁩ ago⁩:

  Now, provide an example that you cannot, is impossible, to translate into French.

  And I’ll accept your claim of unknowing is better than knowing.

• ⁨Comment⁩ on ⁨DIY 4th of July⁩ ⁨⁨10⁩ ⁨months⁩ ago⁩:

  Sure it’s terrifying, but you can start a sparky plasma show in a resilient enough container and keep it going for hours and microwave won’t break. (except maybe overheat.) The microwave will be fine as long as the arcs don’t reach the waveguide cover. (which would risk burning/shorting the magnetron.)

  I have done the microwave grape plasma trick myself and started an arc in a microwave. The current between the two objects goes through a very narrow point, which is enough vaporize the contact point to plasma. This then can grow as the microwave continues to pump more energy into the spark.

• ⁨Comment⁩ on ⁨Can you clear a straight line of malfunctioning pixels on a phone with a lighter?⁩ ⁨⁨11⁩ ⁨months⁩ ago⁩:

  I spent solid 10min writing an useful answer and then looked up. Now I want my 10mins back.

  hint

  Just wipe the screen clear from the goo, dummy.

• ⁨Comment⁩ on ⁨[XKCD]#3101 Good Science⁩ ⁨⁨11⁩ ⁨months⁩ ago⁩:

  Oh, this is a good one.

• ⁨Comment⁩ on ⁨Is water an acid or a base?⁩ ⁨⁨1⁩ ⁨year⁩ ago⁩:

  Do you know about ortho/para-H~2~O? It only gets weirder.

• ⁨Comment⁩ on ⁨It's the law!⁩ ⁨⁨1⁩ ⁨year⁩ ago⁩:

  Send it through the earth, you can reduce it theoretically to 42.5ms

  This isn’t as ridiculous as it sounds and you just need a neutrino-beam… which has a horrible bandwidth plus the ridiculous upfront cost of running two particle-accelerators for a full-duplex link. (Google it up.)

• ⁨Comment⁩ on ⁨Reactor goes brrr⁩ ⁨⁨1⁩ ⁨year⁩ ago⁩:

  MSRs have negative temperature reactivity coefficient and outlet temps around 700C at atm pressure. PWR is at measly 300C and 150 Bar.

  If all control is lost, the salt expands as it heats up pushing the expanded volume out from the reactor core. The fission stops once the fuel is leaves the core region where the moderator is. Reverse is also true: you pull heat off from the loop, so the fuel-salt becomes denser, increasing reactivity. MSRs can naturally “follow” the load, if done right.

• ⁨Comment⁩ on ⁨Binary search⁩ ⁨⁨1⁩ ⁨year⁩ ago⁩:

  When I read this originally, it was a nice example how programmer brain can be applied IRL. Also works when trying to find something and I see the listing is someway sorted, like time tables and eshop product categories.

• ⁨Comment⁩ on ⁨Consume⁩ ⁨⁨1⁩ ⁨year⁩ ago⁩:

  You don’t know untill you try. For me, maybe consuming 400 existential dread doses a day doesn’t register.

  (/s maybe, this is a tongue in cheek post… )

• ⁨Comment⁩ on ⁨IQ Test⁩ ⁨⁨1⁩ ⁨year⁩ ago⁩:

  Reading this legend never gets old. 😂