Contramuffin

@Contramuffin@lemmy.world

• ⁨Comment⁩ on ⁨Copper⁩ ⁨⁨11⁩ ⁨hours⁩ ago⁩:

  Apparently, yes. You can prevent thermal throttling if you expanded the base from 4 cm x 4 cm to 4.5 cm x 4.5 cm, and if you increased the height from 16 cm to 100 cm. The temperature caps at around 97 C.

• ⁨Comment⁩ on ⁨Copper⁩ ⁨⁨11⁩ ⁨hours⁩ ago⁩:

  Ea-nasir promised that these were good quality copper, and I do not have any reason to suspect otherwise. But I’ll have you know, if the copper is of inferior quality, I will make sure to send my messenger to complain. He will not hear the end of it!

• ⁨Comment⁩ on ⁨Copper⁩ ⁨⁨16⁩ ⁨hours⁩ ago⁩:

  Python

• ⁨Comment⁩ on ⁨Copper⁩ ⁨⁨18⁩ ⁨hours⁩ ago⁩:

  Good question. I had to modify my code to run more efficiently, since not throttling implies that the copper block reaches a steady state with very little temperature changes over time.

  But, with the changes, I can say that there is no copper block length that would prevent throttling with a 120 W CPU. It seems the heat transfer within the block is slow enough over such long lengths that you get diminishing returns with longer and longer copper blocks. Here’s a graph I made summarizing the different block lengths that I testedImage

• ⁨Comment⁩ on ⁨Copper⁩ ⁨⁨1⁩ ⁨day⁩ ago⁩:

  See, I thought about doing that, but then I realized: I don’t actually want to do that

• ⁨Comment⁩ on ⁨Copper⁩ ⁨⁨1⁩ ⁨day⁩ ago⁩:

  I left another comment going into more detail about the model specifications, if you’d like to read into it. But briefly: I took the copper heat conductivity coefficient and the air heat transfer coefficient. I sliced the copper block into thin slices and modeled heat transfer between each slice, as well as heat transfer between each slice and the surrounding air.

  It seems that both heat transfer and heat loss do actually matter quite significantly, but they just cancel each other out almost entirely.

  If we assume instantaneous heat transfer, thermal throttling time goes up from 592 seconds to 703 seconds (almost 2 minute difference).

  If we assume no heat loss to the air, thermal throttling time goes down from 592 seconds to 500 seconds (about 1.5 minute difference).

• ⁨Comment⁩ on ⁨Copper⁩ ⁨⁨1⁩ ⁨day⁩ ago⁩:

  Copper conductivity is fast, sure, but it’s not fast enough to have equal temperatures at the top and bottom for such a big chunk of copper. That does affect the time to thermal throttle pretty significantly, actually. If we assume completely homogeneous temperatures across the block (ie, instantaneous heat transfer), according to my model, it’ll take 703 seconds to thermal throttle. With heat transfer, the time drops to 592 seconds - a difference of almost 2 minutes

• ⁨Comment⁩ on ⁨Copper⁩ ⁨⁨1⁩ ⁨day⁩ ago⁩:

  Was bored, so made a simulation to figure it out.

  TLDR: 592.2 seconds, or 9 minutes and 52.2 seconds. Very similar to the other comment, so it appears temperature differentials and heat loss to the air are somewhat minor effects compared to the sheer heat mass of the block

  Assumptions:

  • Copper’s heat conductivity is 400 W/m-K, and specific heat is 0.4 J/g-K, and density is 9000 kg/m^3, and these values do not change over the range of temperatures
  • Air’s heat transfer coefficient is 20 W/m^2-K and does not change over the range of temperatures
  • The surrounding air does not change in temperature and remains at room temperature (25 C)
  • The input wattage is actually 120 W and not just random marketing bullshit
  • The copper block’s size is 4 cm x 4 cm x 16 cm (same as other comment)
  • The temperature within the copper block differs only by the vertical axis; it is assumed that temperature does not change if you move horizontally into the block

  Modeling conditions:

  • The block is sliced into 100 equally-sized slices, stacked vertically.
  • 120 W is input directly into the bottom slice
  • Heat transfer is modeled between each slice
  • Heat loss into the air is modeled for each slice (top slice has more heat loss due to more contact with the air)
  • Heat changes are calculated per millisecond
  • Final time is calculated is the total number of milliseconds it takes for the bottom slice to reach a temperature greater than 100 C
• ⁨Comment⁩ on ⁨Biotech startup Conception claims to have generated the first early human egg cells derived from stem cells, built entirely from scratch⁩ ⁨⁨1⁩ ⁨day⁩ ago⁩:

  Ignoring the ethics questions, this seems like a very bad idea based purely on the insane amount of safety questions involved that are likely unsolvable

• ⁨Comment⁩ on ⁨Roses⁩ ⁨⁨1⁩ ⁨day⁩ ago⁩:

  You’re confusing 2 different but related concepts. Blueshift and redshift does depends only on velocity. In the cosmological sense, redshift (the opposite of blueshift) occurs because everything is moving away from everything else due to the expansion of the universe, and so the distance of an object can be calculated based on how much redshift there is in the light. Basically, on a cosmological scale, distance and velocity are connected

• ⁨Comment⁩ on ⁨Copper⁩ ⁨⁨1⁩ ⁨day⁩ ago⁩:

  Hmm, I think at minimum calculus will need to be involved here. Because we can’t just assume that the heat is spread evenly in the copper - it’ll likely be hotter at the bottom, leading to thermal throttling earlier than expected. On the other hand, there’s going to be heat dissipation into the air, which will help cool the block somewhat

• ⁨Comment⁩ on ⁨Correlation implies causation⁩ ⁨⁨4⁩ ⁨days⁩ ago⁩:

  If I were to guess, probably heat stroke due to rising temperatures. Which, if true, would also be worsened by having more data centers

• ⁨Comment⁩ on ⁨That's some mighty fine lanes you got there!⁩ ⁨⁨1⁩ ⁨week⁩ ago⁩:

  That’s just how ERK looks like. It’s 44 kDa and 42 kDa, which makes it so that you either see 2 bands, or, more likely, you get 1 big fuzzy band

• ⁨Comment⁩ on ⁨Is there hope for humanity? Or are we just destined or designed to wipe our own selves out?⁩ ⁨⁨2⁩ ⁨weeks⁩ ago⁩:

  Humans will survive. Civilization will survive. That’s almost guaranteed. That was never really up for debate. The debate is whether civilization will survive in a form that we would consider to be dignified. Will we have political rights? Will we have privacy? Will we be in a democracy? Will we live as serfs in a technofeudal society? These are the questions that we need to ask.

  And they are important to ask because these are things that we can do something about. In my opinion, the elite intentionally promote doomerism, because people are more unwilling to fight back if they feel like the fight has already been lost. I believe that things can get better. I believe it despite everything going on because I have to. The worst thing you can do is to cede the future to the enemy.

• ⁨Comment⁩ on ⁨Can someone help me get Pygame working?⁩ ⁨⁨3⁩ ⁨weeks⁩ ago⁩:

  It’s not just about being in the right folder. You need to specify the path. If you just do python file.py or pip install whatever

  It will try to use system components, regardless of what folder you’re in. You’ll need to explicitly say, “use this specific venv version of python.” If you’re in the bin folder of the venv, you’ll need to use ./python file.py

• ⁨Comment⁩ on ⁨Can someone help me get Pygame working?⁩ ⁨⁨3⁩ ⁨weeks⁩ ago⁩:

  You’ll want to use a virtual environment. Once you have one set up, you can use pip to install modules. ie, you’ll want path/to/virtual/environment/bin/python pip install pygame

  Then, you can run programs through the virtual environment with the same method. ie, path/to/virtual/environment/bin/python path/to/game.py

• ⁨Comment⁩ on ⁨Rip lol⁩ ⁨⁨2⁩ ⁨months⁩ ago⁩:

  My understanding is, this is a very common cause of death among divers. The pressure doesn’t kill you, but it gets you stuck long enough that you suffocate

• ⁨Comment⁩ on ⁨You can do anything⁩ ⁨⁨2⁩ ⁨months⁩ ago⁩:

  I’m not sure “expendable labor” is really the most accurate description. My understanding was that the pharoahs hired skilled artisans and craftsmen during winter seasons in exchange for food. They didn’t use slaves to build the pyramids, to my understanding

• ⁨Comment⁩ on ⁨What would you do?⁩ ⁨⁨2⁩ ⁨months⁩ ago⁩:

  Sure, but learning tends to be easier when there’s a practical application to the things you’re learning

• ⁨Comment⁩ on ⁨Real⁩ ⁨⁨2⁩ ⁨months⁩ ago⁩:

  Oh, the spider-squids definitely will trigger your disgust response. At least they evolve into something nicer after a while

• ⁨Comment⁩ on ⁨Real⁩ ⁨⁨2⁩ ⁨months⁩ ago⁩:

  I think in part because speculating what the land looks like on an alien planet is actually really hard to do, and the vast majority of artists just wing it. With sufficient planning and rigor, alien planets should look normal.

  For instance, I think the landmass of Tira-292b looks pretty natural. It’s a hypothetical planet created for the Alien Biospheres project, a YouTube series that tries to build up an alien ecosystem as accurately to science as reasonably possible

• This bad boy here can fit so many still-adhered cells in itlemmy.world ↗
  Submitted ⁨⁨3⁩ ⁨months⁩ ago⁩ to ⁨science_memes@mander.xyz⁩ | ⁨1⁩ ⁨comment⁩
• ⁨Comment⁩ on ⁨If you're fond of restoring 30-year-old PCs, but then you see some old PC parts being obliterated by scrappers just to get small pitiful pinches of gold.⁩ ⁨⁨3⁩ ⁨months⁩ ago⁩:

  That seems the exact opposite of capitalism? I would assume capitalist propaganda encourages you to throw away old things and buy new. Preserving old things is antithetical to that

• ⁨Comment⁩ on ⁨Does Anyone Else get the thing where an otherwise nice-tasting cheese randomly tastes of vomit, or have I just been really unlucky and eaten a lot of mouldy/rotten cheese in my time?⁩ ⁨⁨3⁩ ⁨months⁩ ago⁩:

  I notice it when I eat cheese mixed with something acidic or spicy. Quite a discomforting taste but it doesn’t typically stop me from eating it anyways

• Make sure to put it back once you're done using itlemmy.world ↗
  Submitted ⁨⁨3⁩ ⁨months⁩ ago⁩ to ⁨science_memes@mander.xyz⁩ | ⁨1⁩ ⁨comment⁩
• ⁨Comment⁩ on ⁨Don't text me when i'm alkylating shit⁩ ⁨⁨3⁩ ⁨months⁩ ago⁩:

  Alkylation is a term in organic chemistry which means to form a carbon-carbon bond (simplifying, but accurate enough). This is actually somewhat difficult to do - it turns out that carbons are actually quite stable. For context, organic chemistry tends to work with a carbon “core” that doesn’t really change a ton, with a bunch of random other atoms stuck on the carbon core. And you typically mess with the other random atoms rather than the carbon core.

  However, in some semi-specific cases, you can manipulate a molecule to be unstable enough that it would be willing to break or form carbon bonds. Many forms of alkylation involve using a second molecule that contains a carbon bonded to a bromine or iodine (in this case, the molecule is C2H5Br). The end result is that your molecule (the one you want to modify) kicks out the other molecule’s bromine, and a new carbon-carbon bond is formed in its place. Basically, you’ve just fused the two molecules together.

  The meme is just showing several examples of C2H5Br being used as the “secondary molecule” and being fused onto things that make zero sense

• ⁨Comment⁩ on ⁨Is trying weed edibles worth it?⁩ ⁨⁨3⁩ ⁨months⁩ ago⁩:

  If you’re in a legal state, then sure. Start with small doses. I will say though, it does feel somewhat underwhelming. At least for me

• ⁨Comment⁩ on ⁨Can a reasonable person genuinely believe in ghosts?⁩ ⁨⁨4⁩ ⁨months⁩ ago⁩:

  I’ve got some unexplained phenomena that happen from time to time at my lab (workplace). Valves closing for no reason, oddly specific equipment failures, that kind of thing. I don’t believe it’s ghosts, but also I genuinely can’t think of any reason for why those kinds of things could happen. I just say that it’s ghosts anyways because it’s fun.

  In any case, my belief is that out of all supernatural phenomena to possibly believe in, ghosts are the least horrible thing to believe in, so anyone who believes in ghosts gets a pass from me

• ⁨Comment⁩ on ⁨Is Dungeon Meshi worth it if I'm not into anime?⁩ ⁨⁨4⁩ ⁨months⁩ ago⁩:

  There’s not much fanservice in Dungeon Meshi. I would say it’s exactly like how you would expect it to turn out if you just played DnD and then hired someone to animate it. Complete with the player stupidity and boss cheesing.

  The series does take time to build up - it starts off feeling like a generic gimmick anime, but the story and lore gets deeper the more you watch. And the gimmick (eating monsters) ends up becoming a lot deeper than you would expect. (I’ll talk about it more below.) The storytelling is, in hindsight, extremely efficient, but the writers just never draw attention to the info that you’re supposed to remember. So I think it’s one of those series where you really have to rewatch afterward in order to pick up all the lore tidbits that the characters just toss around.

  Speaking of lore, I would say that the worldbuilding is one of the most extremely detailed that I’ve seen in any media, where it touches on really mature topics like implicit (and explicit) racism, tribal tensions, political feuds, cultural differences. And every little thing must have an explanation. And there’s actually different races of humans in this world, each with their own nation and culture. I think it all ties back in to the core theme of the series, which is that eating is so fundamental to life that it influences human culture. And, inversely, that because eating is the one universal constant across all cultures, it is the one thing that can unite people. Over the series, you stop seeing “eating monsters” as a gimmick and it starts becoming more like a thesis. Like, “yeah, of course it would be a show about eating. What else could be so fundamental to discussing the human experience?”

  Touching on the typical icks with anime (oversexualization, often with minors, harem, OP main characters, etc.): the series actually avoids all of the typical anime pitfalls. There’s no sexualization. Characters don’t talk or hint about sex at all. No revealing clothing, and all characters dress appropriately for their job/environment. There is one single scene where one character tries teaching another character about sex (giving the “birds and the bees” talk), but it’s not sexual in nature and IMO it is really meant to highlight a common implicit bias in this world (the character receiving the talk is actually a grown adult, but due to his race, gets infantilized frequently). Speaking of grown adults, every character in the show appears, acts, and is a fully grown adult. And as for power scaling, the main characters don’t have any OP skills and never learn any OP skills. They’re just a standard party of adventurers, and it’s made clear that the only reason they’re successful is because of the party’s deep understanding of monster biology and dungeon ecology and their willingness to use creative solutions to difficult problems (aka: cheesing every boss).

  As a complete side note, I think it has one of the best and most accurate representations of autism that I’ve seen. I’ll leave it vague, but there are several characters that are strongly autism-coded, and the writers really went above and beyond to show how autism is interpreted differently by others when the person in question is a male or female.

  Overall, I’d say I highly recommend the anime. It instantly became one of the best animes that I’ve watched, and it’s an anime that can be enjoyed casually, or analyzed for lore to hell and back, or analyzed for its literary merit.

• ⁨Comment⁩ on ⁨What's the best free version of word?⁩ ⁨⁨5⁩ ⁨months⁩ ago⁩:

  OnlyOffice. Good compatibility with MS Office, and UI is basically equivalent