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Joined 2 years ago
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Cake day: June 16th, 2023

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  • Hugin@lemmy.worldtoComic Strips@lemmy.worldEveryone's dead now
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    20 days ago

    The other problem is the ship signal they traced would have been frequency shifted by the same amount as the time dilation. They would have had to compensate for that to even detect the signal.

    It was 1 hour : 7 years I think. So about a factor of 60,000. So if a ping was once a second it would be once every 42 days. And if it was a 1MHz transmission it would be at about 17Hz.

    So they somehow realized the once a second 1MHz signal was now a every 42 day 17Hz signal at 1/60000 the power. But didn’t realize that there was time dilation involved.





  • This is a bit outside my field. That said I don’t think so.

    The overall crystal should be very weakly magnetic. You want strong magnet with a high flux density so the electric field can push or pull against it.

    I think this would be more useful in quantum computing as you get two bits polarity and spin. Or high density storage.

    But who knows. There are clever physicists out there that know a lot more about this. They presumably see many more possibilities then I do. If the effect can be interrupted you could stitch between states. Like turning a magnet on and off. That would have uses like you described.


  • This article is a mess and badly written.

    Basicly magnetism comes from electron spin orientation. There are two well known spin configurations.

    Ferromagnetism: there is at least one electron with a spin that isn’t paired with an opposite spin electron. That atom then has a north and south magnetic pole. Like iron. Arrange all the atoms pointing the same way and you have a refrigerator magnet.

    antiferromagnetism: all the electrons in the atom are paired with an opposite spin election. It’s complicated but basically they couple together and there isn’t a magnetic pole outside the atom. Like in copper.

    Altermagnetism: what this article is about. You have a crystal of atoms with an unpaired electrons. The crystal would normally be ferromanetic. However they are arranged in a regular set of pairs that cause the electron spin to cancle out. Think of a checkerboard pattern where each white square cancels a black square next to it.

    The antiferromagnetism and altermagnetism both have the spins cancelled out but the mechanism is different so there are different properties. Kramers degenerate vs wavevector.

    In theory this gives you an extra state spin. So a magnetic drive uses a pattern of north and south to encode information. Ie NNSN becomes 0010.

    With this you have north, south but also spin left, right. So you can encode more information.






  • Yeah mid game the cpu load gets bad. Some tips.

    Cleaning up debris into piles to simplify physics calculations.

    Removing gasses you don’t need that are floating around the map.

    Walling off sections of the map with only one door to simplify path planning.

    Killing off or consolidating the wild creatures.

    Setting dups (like cooks) that don’t need to leave your base to not be able to leave.