he/him

Alts (mostly for modding)

@sga013@lemmy.world

(Earlier also had @sga@lemmy.world for a year before I switched to @sga@lemmings.world, now trying piefed)

  • 11 Posts
  • 263 Comments
Joined 1 year ago
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Cake day: March 14th, 2025

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  • for cookies, you can try to open devtools, and then go to network tab, and there find the pdf file, and then right click, and you will find an option something in lines of ‘copy as/for cURL’, copy that, and paste somewhere. repeat exercise for some other file. this should give you some pattern as for how to make a query. it most likely just needs a bearerauth/token in header cookie, or something alike that.




  • try something in lines of

    wget -r -np -k -p "website to archive recursive download"  
    

    may work, but in case it does not, i would download the the page html, and then filter out all pdf links (some regex or grep magic), and then just give that list to wget or some other file downloader.

    if you can give the url, we can get a bit more specific.





  • not my domain, so i looked the title online (the original article is in nature, and not open access, and currently not in uni, so can not access through uni wifi)

    here is a theoretical version establishing physics for this effect - https://arxiv.org/pdf/2505.23083v1

    I am also not reading the linked article, as it is too flowery for me.

    so here is a tl;dr - if you know seebeck effect, this should be somewhat easy. seebeck effect is a effect where if there is a temperature gradient in a material, electricity can be generated. i will not go on about why that happens, but as a statistical argument, just keep in mind that as things are heated, they jiggle (very specific physics term, definitely not me stupidifying oscillations). if it is a “bond” between two atoms (aptly named atomic bonds), we consider a quantisation (fancy way to put number to how strong the vibration is, there is more to it, but not for now) of these oscillations as phonons. another thing is that in materials, these bond are often arranged in some special manners. for most materials, these arrangements are periodic lattices, (think junglee gym bars or rubik cube or some other periodic arrangement). in these materials, phonons can often transfer in different modes, always trapped by the ends. in some materials, these bonds can form helices, where phonons instead of going in straight line, will travel across the helix. if you know what angular momentum is then great, if not, think something with some “speed” going in circles. in that case it will have some angular momentum along the axis of that circle. coming back to main topic, here we have some phonon going across helix, having some angular momentum. now essentially this motion of phonon can create spin current. this requires us to go into separate tangent, abou what spin is, which is well hard to explain. in most materials, there are 2 types of electrons, and we just name these 2 spins up and down (and it has practically nothing to do with up or down directions). as to why there are only 2, is a really big topic we are not going into. but roughly, it is because of nature of material. in non magnetic materials, they behave same, but in magnetic materials, they do not. in some other words, you can say magnetic materials are magnetic because these 2 spins behave differently in these materials. in normal current, we have electrons going from 1 direction to another (kinda, but that is tangent to tangent, not going there). in spin current, these 2 electrons flow in opposite directions. since both are electrons, there is no charge difference created, a spin potential is created. this tudy showed that in non magnetic materials (tungsten and titanium), you could generate spin currents by “injecting” a angular momentum from quartz crystal phonon. if yo have ever heard of angular momentum conservation, this is a consequence of that, as spin current is a kind of angular momentum.

    as to why this could be special, spintronics (the name for using electron spin instead of charge for generating currents and making devices) requires lower power than electronics. one of the problems was that you required special magnetic materials, this is a demonstration without magnetic materials.

    in my physics world, this is big (in a scale of 1 to 10, 10 being theory of everything done, 1 being boring desk work - this is 5-7 - very big in spintronics, and reasonably big electronics), but to someone outside -not that big, like for decade(s). we made first transistors in 50s and 60s, an reasnable electronic devices (the semiconductor chips) by 70s and 80s. we made first spin transistors in 00-10s so i guess another 10 or so years before we see some industry level production.






  • session is basiclly federated (the same model as email and fediverse), where there are different nodes for session. and unlike mail fediverse federation, (if i am not wrong) they have balanced nodes, so basically traffic is spread rather uniformly. as for motivation for starting a node, there are not many, nodes basically form a block chain of sorts and also have something like tor (called lokinet) which also makes your comms hidden.

    i personally never got into session, because it seemed like too hard and complex (i do not like using complex software. even if i do not read to run server nodes for it, i should atleast know how it works to understand my safety model). and unlike signal (session started as a hard fork of signal afaik), they broke pfs (perfect forward secrecy - basically something magically, which makes it so that if some bad actor broke encryption for one of your messages, they can not do that for next message)



  • over here, basically all media houses (those who do tv) are basically paid indirectly by ruling party (we basically have a olligarcy mixed with populist fascism) so anyone raising questions against ruling party immediately is seen as better. If they are unaffiliated with opposition parties, then that is independent enough for me - basically do not take funding from parties or huge corporations, small corporates or businesses are fine as long as there is no major influence on content (they should not have editorial say on anything basically).

    we do not have lobbying as a thing, and any politician taking money from any individual for any reason could be classifieed as wrong doing (that certainly does not stop quid pro quo, they just have to be creative in giving money)



  • i personally only majorly read english only, so would do that. my main source would be folks like scroll.in or bbc india, or reporters collective. if you want to check their work, to see if they fit, you definitely should. Also there are many youtube channels who do ground reporting independent of big media houses (news pinch comes to mind, but many more), so may also share that.

    Occasionally I add explanations for words/terms North Americans may not understand, but that’s not necessary.

    would do that, but i may not know exactly what terms should i add, so may wait for some comments to point out some specific words, otherwise, i can also do a brief post explaining what happens in india and some themes to know, but that would involve a lot work, so i would leave that to a future me (future me hates present me)