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WolfLink

@ WolfLink @sh.itjust.works

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0
Comments
446
Joined
2 yr. ago

  • Sometimes you just get it wong

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  • This sounds like someone learning. It’s incredibly hard to admit you were wrong and do better. Don’t shame her for it.

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  • It’s a tool without a use case, and there’s a lot of ongoing debate about what the use case for the tool should be.

    It’s completely valid to want the tool to just be a tool and “nothing more”.

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  • But can electromagnetism at all emerge if the quantum mechanics dont exist to emerge things like magnetism and some of the behavior of electrons?

    Short answer: yes.

    Technically the world can’t exist without all of its physics. But that’s kinda backwards from how you study it. Quantum mechanics isn’t “more correct” than classical mechanics, it’s more that it’s “more detailed”.

    If you want to model an electromagnet, an electronic circuit, light (in most macroscopic situations), how permanent magnets interact, electrostatic situations like how static electricity makes your hair stand up, lightning, the magnetic fields of celestial bodies like the Earth and Sun (they are big electromagnets), etc. you will use “classical” electromagnetism (meaning Newton’s mechanics, possibly with Einstein’s modifications, and Maxwell’s equations).

    If you want to model material science situations, like determining what material to make a diode or transistor out of, or if a given material can become a permanent magnet, you will likely need quantum mechanics to help model the interactions of electrons on the atomic scale. The section on Wikipedia you were looking at is about this kind of material science. You do this by combining the same “classical electromagnetic” equations with Schrödinger’s equations for quantum mechanics.

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  • diamagnetism, paramagnetism and ferromagnetism can be fully explained only using quantum theory

    The magnetic properties of certain materials (e.g. why an unmagnetized piece of iron sticks to a magnet of either polarization), the way permanent magnets work, is best explained by quantum mechanics.

    However, the electromagnetic force itself doesn’t “arise” from quantum mechanics, and you can explain things like electromagnets and a lot of common electric circuits (until you need a transistor) quite well without considering quantum mechanics.

    Usually you take the “classical” formula for a force and to inform your quantum mechanical model of particles, and that’s how you can arrive at things like deriving how permanent magnets work with the help of w quantum mechanics.

    Generally, a lot of material science and chemistry is inherently quantum mechanical because the way atomic orbitals and molecular bonds work is heavily quantum mechanical.

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  • Fundamental means it cannot be explained by being caused by something else.

    Fundamental force means we expect a carrier particle to explain it (for gravity that’s the Graviton, although it hasn’t been detected yet).

    electromagnetism is caused by quantum phenomena.

    Not even remotely true.

    What is the cause for spacetime or quantummechanics? Idk but somehow they don't make it on the list of fundamental forces.

    Quantum mechanics is mostly that statistics is more complicated than we all thought . Seeking a cause for spacetime is interesting. It might be relevant to mention that there is a fundamental particle that imparts mass, which we call the Higgs Boson. I guess that could make mass and inertia something of a “fundamental force”.

  • How does multi-player support fit into theStop Killing Games Initiative

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  • Supporters seem to be under the impression that companies have a "sever.exe" file they purposefully don't provide players because they're evil and hate you.

    There is some truth to this

    They could also be contracting out matchmaking services to a third party and don't actually do it in-house. Software development is complex and building something that will be used by 100,000 people simultaneously isn't easy.

    There is some truth to this too.

    Making an MMO maintainable by the userbase might be complicated. But way more common are games that could easily have LAN based multiplayer but the company decides not to add it, or even singleplayer games that require an internet connection, just so the company can put limits on how and when the game is played.

  • PNG is back!

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  • HDR PNG is huge

  • Scientists discover promising new way to filter microplastics out of human body: 'The dose makes the poison'

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  • Hydrophobic coating loosely means a thin water proof coating on a material that otherwise isn’t waterproof.

    Example: the previously mentioned popcorn bags are paper based but with a thin plastic based coating. (Historically we used to use wax for this kind of thing but in the modern day it’s almost always plastic)

    Not that containers made of glass, ceramic, or metals that don’t corrode don’t need and typically don’t have hydrophobic coatings.

  • WhatsApp is officially getting ads

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  • It’s still there, buried in the settings. TBF I wouldn’t expect them to remove it, because some people probably do use it.

  • How does everyone deal with this dilemma?

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  • Honestly services like Blue Apron help with this. It’s more expensive than buying your own groceries, but still cheaper than eating out. It also helps you learn meal planning to eventually be able to buy the right amount of food on your own.

    (It is easier to do if you have more people to feed though, like ideally at least one friend/partner/roommate to share the subscription with you. You can do a 2-3x a week meals for 2 subscription for one person, but it’s a bit much.)

  • uBlockOrigin is porting uBOL to iOS and macOS

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  • No.

    The “all browsers are iOS reskin” thing is browsers must use WebKit for JavaScript and rendering, which are the two biggest parts of a browser. WebKit is a library of code distributed as part of the iOS SDK. However, Safari adds more on top of WebKit, including its plugin API. Installing plugins into iOS Safari wont affect anything just using WebKit because they aren’t using the Safari plugins code.

    In theory Firefox could implement its own plugins system for iOS, but it would more limited than the normal Firefox plugin system for other devices, and also they might run into policy issues with Apple (this policy about 3rd party browsers is part of a broader policy against side loading, which has in the past prevented things like emulators and programming apps into the App Store. They have recently started loosening up on their anti-side loading policies, however).

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  • Weddell sea is good, mentioning Antarctica is good, the word “North” is meaningless in this context which is what the OP is laughing about.

  • I'm looking for an article showing that LLMs don't know how they work internally

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  • The environmental toll doesn’t have to be that bad. You can get decent results from single high-end gaming GPU.

  • Deadlines

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  • Who tf makes things due at noon

  • Aloha

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  • Not it’s drops from the sink while washing their hands because OP was using their phone on the toilet

  • Plex now want to SELL your personal data

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  • While selling data in general is shitty, I want to push back on the fear mongering a little bit.

    This only applies to new accounts, can be opt-out of, and doesn’t apply to self-hosted content.

  • Imagine the business opportunities

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  • During the purge I’d hide in my bunker while downloading as much copyrighted material as possible onto a harddrive.

  • I miss those days

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  • I used to have one that would broadcast a short-range radio station that you would tune the car radio to. You’d have to make sure its frequency was far from an actual radio station or you’d get crosstalk. On long road trips you’d have to keep adjusting it.

  • Trump demands Harvard students' info: 'We want those names'

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  • pay NOTHING toward their student’s sic] education, nor do they ever intend to,“ Trump wrote.

    ???

    Universities with high (undergrad) international student populations usually do so because they charge international students higher tuition than local students.

    As for grad students, that’s a way to import high-skill workers and also grad students typically are highly underpaid for the kind of work they do while working towards their degree.