2013-11-20.log

--- Log opened Wed Nov 20 00:00:30 2013
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juri_paperbot: http://dx.doi.org/10.1051/jp4:199338010:31
paperbothttp://diyhpl.us/~bryan/papers2/paperbot/82adb2ba7c021cb2a5699fd8ef85e5d0.txt10:31
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juri_kliment: know anyone doing diamond like carbon deposition?10:35
kanzurewrong channel for kliment10:35
ThomasEgijuri_, like for growing diamonds, or graphit?10:38
juri_er. sorry. :)10:40
juri_i meant kanzure. :P10:40
juri_Thomas: im looking to use it as an electrical insulator, but a thermal conductor on a hot end for a 3d printer. looking at deposition methods now.10:41
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ThomasEgijuri_, i'd suggest aluminum with an thick oxid layer11:03
juri_that's what we're starting with.11:04
ThomasEgigrowing diamonds is possible using microwaves and i think it was methane gas.11:04
ThomasEgibut.. it is a very slow process, and requires a lot of electricity.11:04
ThomasEgiand you end up with polycristaline diamonds.11:05
juri_yea, thats the process we're looking at now.11:05
ThomasEgiwhich are virtually impossible to tool/cut/drill11:05
ThomasEgii had the luck to see the growing process , and also had the chance to try scratching one of those diamond plates.. forget it.11:05
ThomasEgiunles you have a laser to cut it, not worth the effort.11:06
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ThomasEgialuminum with good coating should work. well.11:07
juri_we're re-engineering parts of our prototype, and whatever the last engineer used to insulate the aluminium oxide didn't do the job.11:07
ThomasEgii'd recommend diamonds only for very special applications. like high power lasers where you have a tiny tiny source of heat. and even there you'd only use a small piece of diamond to distribute the heat to a chepaer aluminum or copper heatshield11:08
ThomasEgijuri_, maybe it got scretched or so?11:08
juri_we're basically working through two known defects in our hot end, and both of them have to do with failures in the lectrical isolation.11:09
ThomasEgihow about silicones?11:09
juri_it probably did. hense, why i want a thin layer of diamond, to prevent that.11:09
juri_too high temperature. the low end of our target is 350C.11:10
juri_we might end up tossing out the aluminium block completely... so that we can print aluminium.11:10
ThomasEgiaren't there silicones for high temperatures? i am pretty sure that's what used for thermo element wire insulation11:10
juri_thats further down the line tho. right now, we've got an aluminium sink, and we're shorting across it. its been a problem in both of our prototypes, so i'm hoping we can solve it with a DLC coating.11:11
ThomasEgihow about keramics?11:13
juri_we need high thermal conductivity. the higher, the better our control system will work.11:13
ThomasEgialuminum nitride maybe?11:15
juri_reading about it now.11:15
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ThomasEgiiirc it's thermal conductivity is even above pure aluminum11:16
ThomasEgiand stable up to quite high temperatures.11:17
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superkuhhttp://www.sciencedirect.com/science/article/pii/S0896627312005703 - This free full text article is about a small molecule compound that can interact with non-photoreceptive retinal neurons to give photo-receptivity for UV (with cornea replacement) and blue light (unaltered). Tested with mice.12:07
kanzureis this a membrane-bound molecule?12:09
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kanzure"AAQ is a small molecule K+ channel photoswitch that can exist in both a cis and trans form. The trans form of AAQ binds to cellular K+ channels, blocking the flow of K+ ions, thereby increasing neuronal excitability. In the presence of short wavelength (380 nm) light, AAQ is photoisomerized to the cis form, abrogating its inhibitory effects and decreasing neuronal excitability. The relaxation from cis back to trans is characterized by ...12:10
kanzure... relatively slow kinetics but occurs much more rapidly upon exposure to longer wavelength (500 nm; green) light. Thus, upon incubation with AAQ, individual neurons can be specifically and rapidly activated and inactivated by exposure to 500 nm and 380 nm light, respectively (Figure 1B)."12:10
kanzurethis neuron type fires when potassium flow is blocked? what if it's at equilibrium?12:12
superkuhIt's an inhibiting the inhibitor thing.12:14
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kanzure"The Ross Ulbricht Legal Defense Fund LLC"14:05
kanzureaka the "Dread Pirate Roberts Legal Defense Fund LLC" hah14:05
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nmz787http://www.indiegogo.com/projects/prosthesis-the-anti-robot14:43
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nmz787I wonder how efficiently it captures UV though, doubt its 100%... seems like scintillator contact lenses would be safer14:45
superkuhI am primarily interested because I have retinal deterioration and am likely to have detachment soon.14:46
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nmz787can they glue that?14:47
nmz787back on14:48
superkuhYes. I almost had preemptive laser 'tack welding'. But if it happens while I am asleep or something the tissue would die.14:48
superkuhAnd even if they re-attach it physically it doesn't stop the degradation.14:49
nmz787so you think you could just get away with crappier resolution by making the neural tissue behind it light-sensitive?14:50
superkuhBetter than nothing.14:50
nmz787there's no telling the neurons are in the same physical location as retina pixels14:50
nmz787i wonder if you'd be able to re-map14:51
nmz787there's also this which you could start using sooner than later http://www.wicab.com/14:51
nmz787I met one of the main med drs who was using/designing it14:51
nmz787seems like the issue comes down to something like GPIO MUXing14:52
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nmz787not sure how you'd gain resolution with the tongue sensor type stimulation14:57
chris_99i saw some video where a dude was rock climbing with one of them14:58
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nmz787this is a great idea http://arxiv.org/ftp/arxiv/papers/1212/1212.5436.pdf15:13
nmz787.title15:13
nmz787'Lightningtriggered electroporation and electrofusion as possible contributors to natural HGT among prokaryotes'15:14
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nmz787http://makezine.com/2013/11/09/make-sense-of-3d-objects/15:18
nmz787$399 3D scanner15:18
nmz787supposedly available at Staple 2 days ago15:19
nmz787basically a kinect-like sensor, but software is all automated15:19
nmz787you just copy an stl or ply output15:19
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kanzure"That idea is the opposite of an open-access competitor ofwhich Marincola was previously chair: eLife, an elite journal funded with more than £15 million (US$24 million) from the Wellcome Trust in London, the Max Planck Society in Munich, Germany, and the Howard Hughes Medical Institute in Chevy Chase, Maryland. “Their appeal is that there is quality inferred from the brand,” notes Marincola."15:39
kanzurewhy are journals raising that much venture capital?15:39
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kanzure"A better approach might be translating them into more uniform s-expressions. Mathematica does this. You can also check out a similar approach in Structure and Interpretation of Classical Mechanics where tensor expressions are reduced to scheme expressions."23:12
kanzureParahSailin: you around?23:16
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