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Cake day: February 1st, 2024

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  • qjkxbmwvz@startrek.websitetoScience Memes@mander.xyzSadge
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    14 days ago

    Sounds like it was a 2 petawatt pulsed laser, with picosecond pulses, so 2kJ/pulse. Staggering amount of power and energy for a pulsed laser!

    Note that it’s not CW, so the average power will be much, much, much less than the pulsed power. Too lazy to find the rep rate to see average power.



  • I’ve been super happy with it. Knock on wood it’s been super reliable. I have a single ZFS drive, take snapshots with various retention policies, nothing fancy.

    Another fun thing is to set up a reverse proxy on it as an endpoint for services on your local (home) network which can only be accessed by VPN. For example, my Jellyfin service isn’t public facing, but I didn’t want e.g. my parents to need to set up WireGuard. So instead they can point their TV to a raspberry pi on their network to access the service — even a first gen RPI can handle Jellyfin reverse proxy over WireGuard for moderate bitrates!






  • No, that’s not really a useful way of modeling it for the case of light traveling through a linear medium.

    The absorption/re-emission model implicitly localizes the photons, which is problematic — think about it in an uncertainty principle (or diffraction limit) picture: it implies that the momentum is highly uncertain, which means that the light would get absorbed but re-emitted in every direction, which doesn’t happen. So instead you can make arguments about it being a delocalized photon and being absorbed and re-emitted coherently across the material, but this isn’t really the same thing as the “ping pong balls stopping and starting again” model.

    Another problem is to ask why the light doesn’t change color in a (linear) medium — because if it’s getting absorbed and re-emitted, and is not hitting a nice absorption line, why wouldn’t it change energy by exchanging with the environment/other degrees of freedom? (The answer is it does do this — it’s called Raman scattering, but that is generally a very weak effect.)

    The absorption/emission picture does work for things like fluorescence. But Maxwell’s equations, the Schrödinger equation, QED — these are wave equations.




  • I could be wrong, but I think this could be due to how the states’ suit is worded? As in, I think it’s worded as, “you can’t do that in our state,” and not, “you can’t do that full stop.”

    From another site:

    Attorneys general from 18 other states also sued over the order in federal court in Massachusetts.

    Brown [AG filing the suit] noted his lawsuit is similar, but said he felt Washington should lead a separate case because of “specific and unique harms that are brought here.” He also said that “we have a very good set of judges in our bench here in Washington, so I feel like this is the right place.”

    (My emphasis.)

    So, a good first step, and while this should be struck down in its entirety, my reading is that this was a lawsuit with limited scope, and the injunction matches the limited scope.