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sumpera favorited a video
(1 week ago)
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sumpera favorited a video
(1 week ago)
Abrhám u vynálezce Smoljaka
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sumpera favorited a video
(1 week ago)
Amazingly repulsive, yet 3 simple mirrors just create symmetrical optica...
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Amazingly repulsive, yet 3 simple mirrors just create symmetrical optical geometry. A shining jewel ...made of hairy damp pulsing FLESH. More construction details at http://amasci.com...
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sumpera favorited a video
(1 week ago)
See http://amasci.com... Scratch-holograms can be made upon plastic CD/...
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See http://amasci.com... Scratch-holograms can be made upon plastic CD/DVD cases using a couple of thumbtacks poked through a stick. Or get fancy and use a professional compass and black-painted polycarbonate. Or automate the process with a paperclip stuck into a motorized electric eraser, or a CNC mill with a drag-engraving tool.
Are these genuine holograms? Abrasion holography or "Chatoyant holograms" employ the same physics as white-light or "rainbow" holograms invented by Benton at MIT. Benton holograms reflect light from a point source, and they do not require any interference pattern. This is why a Rainbow Hologram functions the same under any wavelength of illumination. The fringes of Benton holograms can have any spacing: much wider than wavelengths of light. Said another way: if the holograms on your credit cards are genuine holograms, then also "Scratch-holograms" must be genuine holograms. See http://amasci.com...
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sumpera favorited a video
(1 week ago)
These are the animations i made in GMax for the presentation of my railg...
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These are the animations i made in GMax for the presentation of my railgun project, i figured i might as well show them off here.
It starts with a representation of a magnetic field around a wire, a demonstration of the Lorentz effect, and how a railgun combines these to propel a projectile (the + and - minus are switched, sorry). The magnetic field is represented by a green arrow, the direction of current is blue, and force is red.
The next animation shows how the rails are also forced apart by the Lorentz force.
Next i explain how i built the railgun, the injector system, and the capacitor bank.
after that i show some cool photos and videos of tests, as well as some results of the experiment (the green round thing is a simulation of the magnetic field around the rails).
The last part shows images of the rails after more or less 10 shots, there is some rail erosion, but it is very limited because of the low voltage and it only affects the first few centimeters of the rails. I dont know for sure what the black stuff is, it could either be aluminium oxide from the plasma, of soot from the burnt plexiglass enclosure.
Some more interesting results:
-the length of the discharge is 0.0002 seconds
-the average plasma exaust velocity is 1000 m/s
-the projectile experiences an initial force of approximately 100N
-the projectile weighs 40µg
-this means that the projectile accelerates at 2500000m/s²
-the song is called Buddha Bar by Faithless
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