Interested in weather, meteorology and photography. Aviation weather observer.

Other account: @Deme@sopuli.xyz

  • 4 Posts
  • 23 Comments
Joined 1 year ago
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Cake day: July 5th, 2023

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  • Sure, but the vast majority of people live in low lying areas and even then it doesn’t shift that drastically. You need to climb a mountain to see the difference when it comes to applications of daily life.

    Although now that I think about it. The same criticism applies to pretty much every definition of temperature that is based on the behaviour of matter. This also applies to Kelvin. Temperature is a property of matter and every type of matter behaves differently.


  • The thing to remember is that air is a great insulator. Air at 100°C isn’t nearly as bad as say water or metal at the same temperature against the skin. In fact, the air that comes in contact with the comparatively cold human skin will cool down rapidly, forming a layer of cooler air around you and lessening the sensation of heat further.






  • Meidän toiminta?

    Se portin sulkeminen ja lapun jättäminen luukulle. Menee filosofiseks, mutta omission ja aktin raja on hiuksen hieno. Auttamatta jättäminen on omissio, portin sulkeminen ja lapun luukulle jättäminen taas on akti. Tässä tilanteessa se ja sama kummalla mennään.

    Tässä on ajateltava itsekkäästi.

    Itsekkäästihän tässä ollaan ajateltu kaiken aikaa. Sisäpoliittinen kuohunta on Suomen valtion omien intressien vastaista.

    Meidän ei tule pelata samaa peliä.

    Ollaan kuule pelattu samaa peliä jo siitä lähtien kun aiheesta alettiin puhumaan mediassa. Ainoa tapa jolla me oltais vältetty pelin pelaaminen, olis se että oltais otettu kaikki pakolaiset sisään ilman mitään mutinaa, koska ei muutama tuhatkaan pakolaista oo oikeesti tunnu missään pakolaiskriisin jälkeen. Tosin aivan varmasti Persut ja muut rasistit olis tästä silti vetäneet herneen nenään, jolloinka vaikutusyritys sais silloinkin jotakin aikaan.

    Epäiletkö etteikö niin voisi tapahtua? Kun nyt vielä erikseen otit ihan itse esillle sen mitä Puolan rajoilla tapahtui?

    Väännetään nyt sit rautalangasta: Lähes kaikki jotka sinne Puolan rajalle meni, meni itse omatoimisesti ajatellen että heitä odottaa parempi elämä Puolassa. Pakkokeinot tuli käyttöön vasta kun pakolaiset koitti pettyneinä kääntyä takaisin. Tilanne on siis nyt erilainen, koska Venäjä joutuu käyttämään pakkokeinoja jo tässä vaiheessa ihmisten saamiseen sinne rajalle. Ihmismassojen saaminen jonnekkin on paljon helpompaa jos ne menee sinne itse. Kovin veikkaan että Venäjällä olevat pakolaiset ovat kuulleet Puolan tapahtumista eivätkä halua samaan tilanteeseen.


  • Jos meidän toiminnan seurauksena jengiä kuolee rajalle, koituu asiasta sisäpoliittista kuohuntaa ja Venäjä on saavuttanut tavoitteensa.

    Paras tapa omasta mielestä olis ottaa nämä nyt vielä sisään etteivät kuole, jonka jälkeen ison profiilin lausunto että nyt laitetaan lappu luukulle. Näin sais vastuun tulevista rajalle jäätyvistä siirrettyä mahollisimman näkyvästi Venäjän harteille ja sisäpoliittiset vaikutukset minimoitua.

    Tää on 100% PR-tappelu. Optiikat on kaikki kaikessa ja omien käsien tahtaaminen viattomien verellä on iso tyylimoka.

    Ps. Tyylikästä ryssittelyä. Se on aina kiva tietää keskustelevansa aikuisten ihmisten kesken.

    Edit: Niin joo ja koska ne joutuu nyt jo pakottamasn väkee rajalle, on syytä olettaa että suuri osa pakolaisista on tietosia siitä mitä Puolan rajalla tapahtu. Pakolaisten massamuilutus tuhansittain olis semmonen logistinen operaatio että saas nähdä olisko ees Venäjällä kuinka käytännöllistä.





  • I have my doubts about that stealth. If it were just the tungsten rod by itself, it could well be coated in black, but the impulse needed to drop a massive projectile out of an orbit (and furthermore into a trajectory that impacts at the target) necessitates a relatively hefty maneuvering unit and that has to radiate heat to be kept operational. Cheaping out on the propulsion could be very costly because a failure in the middle of the deorbit burn would result in the rod coming down in a place you don’t want it to.

    The only way to hide it would be with decoys, which are already used by ICBM’s. Unlike ICBM’s, an orbital platform would need those decoys well before it’s used because there’s no terrain to hide in. A ballistic missile sub is very hard to track, satellites, not so much.

    About countermeasures: Becuse the rod can’t move by itself, it’s stuck on a fixed trajectory after the propulsion stage is discarded. This makes it an easy target for an interceptor missile. You already know where to look so the stealthy rod isn’t that hard to find, and then you just have to collide with it. And because the rod is coming down from MEO at the very least, you have ample time to do all this. An impact at such speeds would disintigrate anything and the rod isn’t an exception. At the very least it would fracture into multiple less aerodynamic pieces that do much less damage than the sum of their parts.


  • Gravity is not your friend. Getting stuff into LEO is still expensive af. A kinetic projectile dropped from space might have the same energy as a nuke, but it’s still going to be a lot more expensive. Additionally, you don’t have options on how that energy is released. It’s going into the ground and that’s that. A nuke (or any other explosive device for that matter) on the other hand can be detonated at a chosen altitude, or as a bunker buster if that’s what you want.

    The heavier the object, the more it’s going to take to push it out of that orbit. If your weapon system is in LEO, you can realistically only drop a rod on a small envelope along the future trajectory of the weapon system. Polar orbits would have the best coverage, but fly over a target outside of polar regions only twice a day. In order to get a wider range of firing solutions, the projectile needs considerable deltaV for orbital changes. And again, gravity fucks you over here because deep within Earth’s gravity well, changing the orbit of a massive tungsten rod takes a lot of fuel. Higher up these deltaV costs wouldn’t be as prohibitive and you’d have more options for using the weapon, but that would increase the time from launch to impact into the regieme of hours, way too slow for anything.

    The best solution would be to have a huge amount of rods in different orbits (akin to the spacejunk that is Starlink) to maximize the chances of at least one being able to fire on a target at any given place at any given time, but because those rods are still heavy af, such a plan is completely unfeasable.

    Rods from gods will never happen, at least not around Earth.


  • Deme@lemmy.worldto196@lemmy.blahaj.zonecute rule
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    10 months ago

    This.

    Also applies to the eyes sort of, as tilting the head offers a different axis for the stereo vision to try to make sense of whatever it’s looking at.

    IIRC, animals often do this movement instinctually when they’re puzzled by something because the additional sensory information could be helpful.


  • Hey guys, Peter Griffin here to explain the joke the image.

    The image taken in Yunnan (China) 16 Aug 2022 by JiaQi Sun displays a Cumulonimbus calvus with the accessory cloud pileus on top. A pileus is formed when a rising cloud pushes the air above it higher which causes it to cool down adiabatically. When sufficient humidity is present in that higher layer of air, the humidity condenses into a pileus.

    Here the pileus displays quite magnificent iridescence. The sun is behind the cloud. When sunlight passes through the very small and evenly sized cloud droplets of the pileus, diffraction takes place. Different wavelengths are diffracted in different angles and thus the white light of the sun is broken down into separate colours. While the cloud droplets are similar in size, there is still some variation there. The size of the droplets also affects the ammount of diffraction and thus the colours are somewhat disordered.

    If you want to see cloud iridescence yourself, look for clouds passing in front of the sun that aren’t opaque enough to block it completely. Lenticular clouds, Cirrocumulus lenticularis in particluar are good candidates for iridescence as they are formed in a similar manner to the pileus here and have an even distribution in droplet size.

    There have been a number of viral photoshops circulating the internet since the original pictures were taken where the cloud has been added to wide angle shots and made to appear like it takes up half the sky. These however are easily debunked with basic knowledge about clouds and the optical phenomena in question as the colours here are impossible at wider angles.