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@prooptiki
236 subscribers
234 photos
337 videos
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Prooptiki Vatrachou, a frog's eye view.

We find good technical/sciency videos about random stuff and post them here.

Suggestions and feedback: post in the comments to any video

https://www.youtube.com/watch?v=GkbMQILr25Q
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Προοπτική Βάτραχου
236 subscribers
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Forwarded from Doque Embedded
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https://www.youtube.com/shorts/hqtoASG9JBU
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https://www.youtube.com/watch?v=awYnkzQn8II
YouTube
It can be FREEZING COLD in the cab of a STEAM ENGINE? How did they stay warm?
It is not a commonly known thing that it can be cold next to a boiler! Without these few treatments, it can be extremely cold in the cab. Thanks to the ICC, crews got to stay warm in the day.

Merch: https://hyce.creator-spring.com/

Join my discord: htt…
89 views
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https://www.youtube.com/watch?v=lpN_Mw8RgDI
YouTube
Building a tilefloorophone (actually two)
Building keyboards with tile floor, one chromatic instrument, one bass pentatonic with resonators, and making music with!

You can support the channel and get access to my ebook and exclusive content here:
https://www.patreon.com/nicolasbras

I'm Nicolas…
96 views
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https://www.youtube.com/watch?v=dxYDq_L_pec
YouTube
Chainmail 3D Printed
STL: https://linktr.ee/propsmaker

Here is my design of a full Chainmail for FDM printers. I have printed with PLA.

#3dprintprops #cosplayprop #cosmaker #propsmaker #chainmail #chainmaille #3dprintingcosplay #3dprops #asmr #cosplay
88 views
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https://www.youtube.com/watch?v=6AV2NcyX7pk
YouTube
Ritom Pumped-Storage Plant Project – Tunneling under extreme conditions
The Ritom power plant in Ticino, which was built in 1920 and is located only a few kilo­meters from the Gotthard Tunnel, is in need of re­newal. Since 2018, a number of con­tract­ors from the Marti Group have been working on this over­all complex re­novation…
131 views
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https://www.youtube.com/watch?v=dtcq5b0R65w
YouTube
Light & Coherence part 1: Temporal Coherence
This is the first episode about coherence and how this wave phenomenon can cause waves to behave like localized entities.
Unfortunately the quantum (or corpuscular) description of light leads to a lot of confusion. The goal of this video is to describe "quantized"…
89 views
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Forwarded from dead archive
Flood in Bashkortostan • 1979
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86 views
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https://www.youtube.com/watch?v=Fui19FPh0R0
YouTube
Making Benzaldehyde From Cinnamon Oil
Today we are carrying out a super inefficient synthesis of benzaldehyde. This is a cool example of the Retro-Aldol reaction. This really is not a great way to get benzaldehyde though, and it is mostly just for educational purposes.

Chemplayer Video: htt…
90 views
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https://www.youtube.com/watch?v=m2tbK26IacM
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90 views
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https://www.youtube.com/watch?v=kSlY6WDOSQw
YouTube
Making benzaldehyde so I can be friends with the DEA
Today we make benzaldehyde via the Sommelet reaction. This one was quite a fun one to make as it smelled so good. I am not sure what to use it for next, but I might use it in another synthesis video down the line. Please like, comment, and subscribe, as it…
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Electric Arcs in a Magnetic Field
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https://www.youtube.com/watch?v=g4DynEd5zKA
YouTube
Lofi and Ambient Production Tip | Cross-Format Cassette Processing
The beauty of analog equipment is that cross/compatibility is not only possible, but can result in some lovely side effects. Here, I'll discuss some ways to spice up your Ambient, Lo-fi, and Experimental music production with some tricks to kickstart the…
90 views
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https://www.youtube.com/watch?v=73_CiAYX00k
YouTube
Combination Tones
The vanguard of psychoacoustic music. Tartini Tones, Combination Tones and Heterodynes play with perception and push the boundaries of music. This video essay explores what they are, how to hear them, and how they’re used on the cutting edge of the avant…
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https://www.youtube.com/watch?v=Pe_th8v3JWo
YouTube
Minesweeper Opening Strategy: The Classical
Here it is! the first video about minesweeper openings.

A little thing that I dont mention in the video: what I say here refers to the "EXPERT" difficulty. Optimal moves in different difficulties may differ.

Timestamps:

00:00 Intro
02:30 The Classical…
88 views
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https://www.youtube.com/watch?v=ivRYtgZNlAw
YouTube
Bush Plane Landing on EXTREME Mountain Runway
This runway located in the Star Mountains of Papua, 12 minute flight from Oksibil village and located in the same valley as Kiwirok. It's position relatively to the predominant up and down valley winds can make it a real challenge to land, specially if with…
90 views
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https://www.youtube.com/watch?v=yMGVp4BM6tk
YouTube
Experimental Wave Drive V2
Ad: You and your company can try Onshape for Free at https://Onshape.pro/JamesBruton
Check out the new CAM features coming to OnShape soon: https://www.onshapelive.com/event/ad95f7af-999c-4126-ba77-e5f615008895/summary?utm_source=jamesbruton&utm_medium=youtube…
88 views
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https://www.youtube.com/watch?v=cyN-CRNrb3E
YouTube
Triple Pendulum on a Cart
Triple Pendulum on a Cart
Swing-up and Swing-down

Two-degrees-of-freedom design:
Constrained feedforward & optimal feedback control

TU Wien ACIN CDS http://www.acin.tuwien.ac.at/

Done by Andreas Eder and Tobias Glück

Publications:
Glück T., Eder A., and…
99 views
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https://www.youtube.com/watch?v=YxSqQ8_YsCc
YouTube
Operation of razor blade sharpeners
Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.
90 views
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Forwarded from То яма, то канава
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Наглядное объяснение того, как и из-за чего происходят землетрясения на стыке тектонических плит. Сценарий таких подземных толчков примерно одинаковый: одна плита заходит под другую и в какой-то момент одна из них "рикошетит". Эту наглядную модель сделали в музее естественной истории префектуры Вакаяма.
К сожалению, системы прогнозирования землетрясений, которые ещё не произошли, пока не придумали. Но в Японии эффективно работает система предупреждения об уже произошедших землетрясениях, вибрация от которых еще не ощущается на поверхности. После ее срабатывания есть 20-30 секунд на то, чтобы подготовиться к удару. О ней можно прочитать здесь.
86 views