#applied physics

[notjustjavierpena]

Applied Physics pt ii is so close to being done that it is unbelievable. I really did have time to sit down and write. We’re at 7.5k which might be a bit too much smut. I don’t know. I hope it lives up to expectations.

[zlo-sovs-lifeboat]

SCIENCE SIDE OF TUMBLR, I MAY BE ONTO A DISCOVERY.

So What if I were to apply Rehbinder effect when making an obsidian blade?

Obsidian can already be sharpened to 30 angstroms, but then if we apply the surface tension doing it's thing we can remove their innate coarseness, hell, this kind of deformation may actually result in a Less brittle blade.

[alvinmichaelmurphyseville]

Since Jeanette was talking about her favourite branch of biology earlier - what is your favorite branch of Physics?

“That’s another tough choice, since everything physics excites me. I’d probably say either Applied Physics or Astrophysics. Theoretical Physics is pretty neat too, so I’d say that’s a close second.”

“What can I say? I love hands on experimenting and applying what I learned and I also LOVE space! (And aliens lol)”

“But sometimes it’s nice to just kick back and think about the wonder of the universe we’re livin’ in.”

[advocateforinterestingoddities]

Flying, Falling, Missing the Ground, and Orbit

In Hitch Hiker's Guide to the Galaxy, Arthur Dent is described to have figured out how to fly by 'forgetting to fall' this allowed him to miss the ground when he fell, and thus, fly. In this universe the flying is simply, 'flying is learning how to throw yourself at the ground and miss'.

In physics class today, we were discussing gravitation, and with that, orbit. The example my teacher used was if we were to throw an object out of a cannon (take in mind on a picture on the board the cannon is certainly tall enough to see how this would work rather than to any sort of scale). It would fall some distance from where we threw it from.

If we threw an identical object with more force it would land farther away.

If we keep throwing identical objects with more and more force, eventually we get to the point, where we throw it so hard that we miss the ground entirely (but not so hard it breaks orbit), and the object is effectively falling around the world right back to us.

The key to being in orbit, if not flying, certainly is to throw yourself at the ground and miss!

I don't know if this was intentional on Adam's part, but I found it delightful as someone who really enjoys his works as well as physics. He has some of my favorite 'magic adjacent' systems and logic, so I always held onto his description of flying, and today I was super happy to find that he's kind of right!

(also, I know that getting into and out of orbit is much much more work than this, but at it's most basic explanation, 'missing the ground as you fall' is a pretty good description.')

[kamalkafir-blog]

Laser beams programmed to form various shapes by nanodisk arrays

Nature, Published online: 30 July 2025; doi:10.1038/d41586-025-02383-3 ‘Metalasers’ have been developed using metasurfaces comprising nanodisks, each with an off-centre hole. By changing the rotation angle of the nanodisks’ holes, the wavefront of the metalaser’s emission can be modified to generate arbitrarily shaped beam profiles, including focal spots, vortices and holograms, with notably low…

[andranikfakirian]

Current Projects

After so much time of silence, I feel the necessity to report about the past and current situation. I'm sorry if it seemed to you that I've abandoned the blog idea. I didn't forget it, I just couldn't find enough time to start publishing again. But now I'm determined to come back with news. And I definitely have a content to tell you.

And the first will be the satellite project. Honestly, we still haven't finish it, and I'm not sure if I have time to continue the work right now. Therefore, there won't be many updates about this project at the moment (if there are any at all). We do have some results for our assessment for Data Analysis subject, so we obtained some good grades. But I'll do my best to continue working when I'll find enough free time to do so. And yes, when I say "we", I am not mistaken. This project is being conducted by me and my partner. I'll introduce him if he doesn't mind.

P.S.: Here's the performance of our model. The first image is a satellite photo, the second - ground truth mask image, the third - prediction made by our not enough trained model.

The second will be the computational mathematics project. I have reached a milestone in the form of an almost beta version of the software package. The solver with automatic timestep sampling has already been created and works pretty well. It's still not really optimized but it's already useful and precise. There's still enough space fpr research and testing the algorithm, so it's possible to obtain in the near future enough material to make a publication in a scientific journal.

P.S.2: Here you can see the difference in performance of two algorithms: explicit RK4 (the upper image of unstable solution) and mine implicit (m, k)-method with autostepper (the lower image) - for the same problem.

[natasa-pantovic]

AoL Mindfulness Inspirations on Pinterest

Applied Philosophy, and Psychology, meditation as an ancient European self development transformation tool...

[academiceurope]

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[romanticmoonchild]

Does anyone here understand physics? Specifically applied physics?

[emacrow]

You're just like me.

Mary sat in the visitor center of Gotham, puzzled on the a fact someone wanted to met her.

She knew it wasn't a reporter as they were clearly banned from talking to her after her last meltdown. Twiddling her finger a bit as she hear the buzzing sound of a door opening.

It was a 14 year old preteen wearing casual yet sharp clothes, his long black hair in a low ponytail, freckled scattered on his face like stars and a nervous smile, but his eyes.

His blue dull sleep deprived eyes looked much older than they were, and it made her froze in recognition.

Before she could speak a bit.

"I was told you and I had a similar situation in being young looking." His voice sounded young, yet soft as if testing an inside joke.

"I'm Danny, Danny Fenton, I'm 36 years old, but in appearance to everyone else, I'm just an arkward, just turned 14 year old boy to others." Danny said softly, scratching his cheek with a soft smile.

Mary louise dahl felt a smile bloom back as she introduced herself.

Maybe being born different isn't all so bad afterall.

Inspired by this post <-

-> Part 2 here

[advocateforinterestingoddities]

Ms. Frizzle, and the for once, normal fieldtrip

It isn't even actually a fieldtrip, they just go to the school playground.

I'm in physics right now, and if there's one thing I'm learning from stuff like rotational inertia v rotational acceleration it's that the little spinny pole things on the playground that made you fear for your life at the tender age of six are a perfect example.

Allow me to set the scene. You foolishly walk up to the thing, and you manage to start spinning and get going pretty fast. The damn thing's at an angle so you pick up speed until you thing you can't hold on any more. Here is where you make a near fatal mistake.

You try to pull yourself up.

Now your mass is all of a sudden far far closer to the axis of rotation than it was before and as a result, you go super-duper fucking fast. Now you're stuck, you can't pull yourself up, you feel as though you are about to die (and you really can't wait it out, because of the aforementioned angle of the pole, everytime you think you're stopping, you just keep going)

This same concept is why you get a speed boost when you bring your hands in while you are spinning really fast. (I've also done this swinging a book bag around, you get going super fast 10/10 would recommend)

Also things like swings when talking about the force of gravity and how you feel heavier at the bottom of the swing than at either peak.

Ms. Frizzle decides to teach all of this and more on the playground, and everyone spends the entire fieldtrip waiting for the other shoe to drop (it never does)

[kamalkafir-blog]

Highly efficient air filter inspired by mucus-covered nasal hair

RESEARCH BRIEFINGS 09 July 2025 Airborne particles adhere to filters only weakly. A filtration strategy that mimics the effects of the mucus layer coating nasal hairs captures particulate matter effectively, owing to a mechanism called capillary adhesion. Filters using this technology perform better than conventional air filters and have a longer lifespan. Source link

[andranikfakirian]

Project "CompMath.AstrophysicsODEs": Software Package

Finally, I got my hands on this project again. There is definitely a strong progress in the project at the moment: there is an alpha version of the software package. It is an ODE systems configurator, (m, k) - solver and visualizer combined with user-friendly interface. Unfortunately, currently only a version of solver with a constant timestep has been made, since the theory of Novikov methods is freely available only for such an implementation of the algorithm, as far as I know.

To create a solver with automatic timestep sampling, a couple of different algorithms are usually used. Based on the discrepancy in the solutions of the equations produced by these methods, it is decided wether to change the timestep in order to reduce the error by decreasing it, or, conversely, to lessen the total number of steps by increasing it. Among the methods described in the scientific literature with decent accuracy, there is only one calculated one. Thus, to manufacture more advanced solver, it is necessary to devise another algorithm and pair it with the first one.

And that's where the good news begins: after several hours of cumbersome "semi-automatic" calculations, another theoretical technique with all the necessary quotients has already been computed. Consequently, further implementation of the method with an automatic time step will be only a matter of technique.

In the meantime, you can admire the work of the software package with a "constant solver" on a very trivial stiff problem with an exponential analytic solution.

P.S.: The graphics below show the computed solution to a simple task (u(t)) and its relative error (uEps(t)) based on the deviation from the analytical solution. I ask you to pay attention to the fact that the error is really low (maximum about 0.0000025%) for a rather stiff problem (the value reaches 2.5·10^43 in one second).

[screambirdscreaming]

Perhaps the most peeving thing here is the way people keep jumping up to say, "you dont understand! I just want comforting narratives where people like me are embraced by society, as a break from reading stuff where I have to think about implications - you just don't understand the appeal of reading cozy mindless things to relax!"

And I'm like. Actually I really do! I often enjoy stories that are comforting and not emotionally challenging! I just dont find narratives of assimilation comforting. I don't find it reassuring or mindless to be shown a world where certain people have been moved from the "marginalized" box to the "normalized" box, and proceed to have a totally standard normal-guy low-stakes narrative from the lap of societal acceptance! I dont find it at all a balm or comfort to the struggles of marginalization. I find it grating and exhausting, and it makes me feel *more* aware of the forces of oppression and how they exist as the necessary inverse process of the forces of normalization.

There's a lot of political baggage here, obviously. Without digging too deep into that: if the type of story that gives you the least cognitive dissonance is one where you are - without changing in any way - allowed back into realms of "socially normal", what that means is basically that you consider your expulsion from normalcy an aberration, rather than a sign of deep flaws in the concept of social acceptance. You have not integrated your own experience of marginalization into a perspective on what marginalization says about society. You have not sought solidarity with other perspectives on marginalization, or if you have, it's still with the back-pocket loophole that you think you might, personally, be allowed back in. And that you're not sure you wouldn't take it, if you were.

And I get that for queer people right now, a lot of this is hazy. Maybe you would be allowed back in! Maybe you are! There's been a big swing in social acceptance, even if it's really unstable. Maybe the idea of a world where you, personally, can go back to being unmarginalized is a possibility that feels genuinely comforting.

But if you, or your friends, are a little farther out of reach of that edge. If the nature of society is so fundamentally hostile to you that simply being "accepted back in" would not meaningfully alleviate what hurts you about society - if the bare minimum for a world that isn't hostile to you requires deeper than a surface-level change - than playing pretend with that surface level change provides no comfort. If anything, it makes the cognitive dissonance worse - and makes you feel like your supposed allies are fairweather friends who would ditch you in the struggle if they were offered a bargain of acceptance. Which is very lonely and upsetting.

Or, regardless of how personal it is to you, if you've read and thought deeply enough into history or social theory to see how arbitrarily constructed the whole concept of social acceptance is - if you're a bit aware of the implications and underpinnings of things like family structures and divisions of labor and the like - the kinds of slight-of-hand shortcuts that are used to put those problems out of sight become very frustrating. Again it's a matter of cognitive dissonance: whether the typical fiction/fantasy "stock answers" to various concerns reassure your sense of how things normally work, or whether they raise red flags of horrors shoved out of sight.

Some people will act like you're "overthinking everything" and "actively looking for problems" if you talk about your emotional reaction to those red flags. But no: it's as direct and thoughtless as the reaction of finding them a comforting reassurance of business going on as usual. (You could say, the curtains are red at home. Comfort is a matter of perspective!)

Anyway, it comes back to a baseline of: what ways of conceptualizing the world feel easy, comfortable, and thoughtless to you? They may not be the same as the concepts you would consciously acknowledge, or agree with on a cognitive level! There are a lot of layers to integrating ideas into your worldview. It can take a lot of time and reflection for things to reach deeply, to the level of your intuitive reactions.

When people say, "I know it doesn't really hold up to scrutiny, but it's just really mindless and relaxing" - what that indicates, I think, is a certain particular position on that curve of conceptual integration. Where your deep emotional relationship to the idea of normalcy and assimilation is in a different place than the concept you consciously hold. And I can see where people get really upset when you push on this, because it feels like you're invalidating the things they truly and actively believe, by pointing out that the things they emotionally resonate with are in fundamental contradiction to those beliefs.

But it's also really annoying when people insist that you "just don't understand the appeal of mindless comfort fiction", when what you are actually trying to say is that you think it would be nice if people wrote more fiction that was comforting to people who find the idea of assimilation uncomfortable.

[five-thousand-loaves-of-bread]

autistic people dominate AAC conversation on tumblr so for this AAC awareness month (October), let us also remember all non-autistic AAC users & autistic AAC users who not use AAC because or solely because autism.

people use AAC for from intellectual & developmental disorders to neurocognitive disorders to neurological to physical disorders. people use AAC for disorders from birth & acquired disorders. progressive & non progressive disorders.

some AAC users have mouth speech, motor, and/or sound clarity related difficulties, others use for language and/or cogntive difficulties, some for combo of reasons.

those with…

intellectual disability

genetic & chromosomal disorders like down syndrome, rett syndrome, angelman syndrome, williams syndrome, etc.

cerebral palsy

speech language disorders like aphasia & dysarthria

schizophrenia & schizoaffective & schizo-spec

brain injury

dementia

amyotrophic lateral sclerosis (ALS), multiple sclerosis (MS), huntington’s, frederick’s ataxia, etc.

tracheotomy

locked in syndrome

n so much more not listed here

[oriixxc]

you sure wanna interrupt devil’s poker night?