--- Log opened Fri Sep 25 00:00:30 2020
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01:19  * srk too a bit
02:37 < juri_> lsneff: I'm the implicitcad author, and the hslice author. so i spend all day doing 3d math.
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03:26  * archels worked on a physics engine
06:02 < kanzure> "Additionally, left unchecked, the power to edit humans’ genetic codes could lead to questionable manipulations, from “designer babies” with curated traits, to humans with severe complications due to editing gone wrong, to genetically modified people with nonhuman traits à la Spider-Man or Wolverine."
06:02 < kanzure> uh......
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12:45 < archels> the UN has taken up writing a report on geoengineering
13:22 < kanzure> https://www.youtube.com/watch?v=jlT3MeCzVao
13:40 < fenn> "Shit Rationalist Say"
13:57 < kanzure> fenn: now do one for steve
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16:11 < fenn> lsneff: while straining some broccoli in a mesh strainer i noticed the water droplets clinging to the holes in the mesh. it occurred to me that one could make a decent microlens array by dipping a grid of round holes into a clear acrylic resin that would later harden. the grid would have to be coated in some substance that was attractive enough to the resin that the droplets stick, but not so
16:11 < fenn> attractive that they would coat the surface instead of forming droplets
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16:12 < fenn> maybe you could tune the droplets' curvature with an electric field
16:13 < strages> Electrowetting
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16:14 < L29Ah> fenn: you'd also need to tune gravity somehow
16:14 < fenn> or the viscosity
16:16 < L29Ah> viscosity won't help you much at making biconvex lenses
16:16 < lsneff> That's a good idea,
16:17 < lsneff> I assume you mentioned me because I was looking into microlens displays at one point?
16:17 < fenn> yeah
16:18 < lsneff> You could have the mesh move downward at a set speed to tune the curvature of the droplets.
16:18 < L29Ah> acceleration even, yeah
16:19 < L29Ah> but that would demand vacuum
16:19 < fenn> the thickness of the film is initially set by the viscosity and gravity creating shear in the fluid. the thick film later conglomerates into droplets due to surface tension
16:19 < fenn> it's similar to spin coating
16:19 < fenn> i suppose you could do it in a spin coater as well
16:21 < lsneff> If you then vibrated the mesh quickly and cured the resin at the same, I wonder if you could separate them.
16:21 < L29Ah> the matrix should probably be made of a resinphobic-resinphilic-resinphobic sheet to pick the appropriate amount of resin and move it at the appropriate place
16:21 < fenn> sure but what do you want a bunch of tiny lenses for
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16:22 < fenn> circuit board houses let you do lots of tiny holes and coat the holes and the rest of the board with different stuff like metal or solder mask
16:25 < fenn> for volume production or larger displays you'd want to use etched holes since the drilling time and probability of failure adds up
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--- Log closed Sat Sep 26 00:00:29 2020