• 16 Posts
  • 20 Comments
Joined 8 months ago
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Cake day: November 20th, 2024

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  • This is exactly why. Some numbers:

    • Polycarbonate thermal expansion coefficient - 65 * 10^-6 per degree C (source)
    • Glass thermal expansion coefficient - 9 * 10^-6 per degree C (source)

    Most amateur telescopes are used shortly after dusk when the temperature is changing more rapidly than deep in the night when the temperature might be more stable. Also, the coatings are not as resistant to more dramatic expansion cycles (remember that you need those mirrors to stay very smooth). Given the high price and low volume of the goods, it doesn’t make sense to cheap out on a critical component like this and give yourself a bad reputation among a very small but dedicated community.


  • I kind of feel like this was a missed opportunity to have Ponko replace Yachiyo in the OP.

    I am traveling right now, so I am going to keep it short. I wasn’t really feeling this episode for a while. Yachiyo going through a rebellious phase (no matter how hilarious or well animated it was) felt a bit out of character to me. However, they brought me back around with the emotional exchange between the two. I am going to miss this show when it is over.








  • wjs018@piefed.socialtoTechTakes@awful.systemseating our own dogshit
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    2 months ago

    I just looked at the first PR out of curiosity, and wow…

    this isn’t integrated with tests

    That’s the part that surprised me the most. It failed the existing automation. Even after prompted to fix the failing tests, it proudly added a commit “fixing” it (it still didn’t pass…something that copilot should really be able to check). Then the dev had to step in and say why the test was failing and how to fix the code to make it pass. With this much handholding all of this could have been done much faster and cleaner without any AI involvement at all.




  • I have a PhD in physics, primarily working on fluids and now I work in industry on fluid dynamics. Having just read the abstract, I can already tell that this paper is one of those that borders philosophical about the author’s view of their field. Nothing wrong with that though as we physicists tend to wax poetic from time to time.

    The question about when we can consider turbulence solved is an interesting one. I still work in the field and for most useful applications of fluid dynamics, I would consider it a solved problem. Not to say that the NS equation is solved analytically, but rather that the field has built up a toolbox of phenomenological models and CFD systems that are more than good enough for the range of scales that we typically work with. The bigger problem for CFD in this space is optimization, an issue where GPUs have proven to be invaluable. Only in the past couple years have the major CFD software packages started supporting GPU computation, speeding things up 2-10x depending on the specifics.

    I think that turbulence is an issue really at the extremes of scales at this point (very tiny, very large, small dt, hypersonic, etc.). Also, I think that it would be difficult in a system with complex forces acting on your fluid, like in a plasma where E&M forces are so significant. So, good luck all you folks working on fusion reactors!






  • wjs018@piefed.socialMtoAnime@ani.social[Meta] Rules Page and Update
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    8 months ago

    Also, this is neither here nor there, but I have been trying out piefed lately and it’s pretty cool. Thanks to the devs over there, the anime community should be a lot more compatible with piefed going forward thanks to squashing a couple bugs I found from our use cases. Specifically, piefed users should now enjoy:

    • Images on episode discussion threads don’t disappear when I edit in a screenshot submitted by a user (relevant issue)
    • Clips submitted to the community will no longer break the UI in Tile or Wide Tile view (relevant issue)