2016-07-07.log

--- Log opened Thu Jul 07 00:00:50 2016
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nmz787.tell chris_99 just because it is plastic, I mean, I guess it wouldn't flex MUCH, but maybe noticable for some kind of long-term interferometry or something? where you couldn't recalibrate pretty often01:06
yoleauxnmz787: I'll pass your message to chris_99.01:06
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abetusk.title https://www.youtube.com/watch?v=tDuUhBvmfzw04:39
yoleauxHow to - Hydrophobic Coating for the OpenDrop - Part 1 - YouTube04:39
abetusk.title https://www.youtube.com/watch?v=oQGMmZuZwpI04:39
yoleauxHow to - Hydrophobic Coating for the OpenDrop - Part 2 - YouTube04:39
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chris_99wow that opendrop board looks really neat06:02
yoleaux08:06Z <nmz787> chris_99: just because it is plastic, I mean, I guess it wouldn't flex MUCH, but maybe noticable for some kind of long-term interferometry or something? where you couldn't recalibrate pretty often06:02
chris_99ah gotcha, cheers nmz78706:02
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xentracyeah, the normal kind of optics workbench is a granite slab with a grid of holes drilled (and I suppose reamed) in it06:25
chris_99granite?! aren't they just metal06:26
xentracgranite's thermal coefficient of expansion is about two orders of magnitude smaller than that of a plastic and one order of magnitude smaller than a normal metal (excepting special alloys like invar)06:27
xentracthe ones I've seen are granite06:27
xentracgranite also has the merit that you can quite reasonably make it 100mm or 200mm thick, while that leads to difficulties with metals06:27
chris_99hmm https://www.thorlabs.de/navigation.cfm?guide_id=41 those are all steel06:27
xentracmaybe the ones I've seen aren't typical06:27
xentracsteels and granite also have the advantage of having a Young's modulus an order of magnitude or so higher than common plastics06:28
chris_99ah06:28
chris_99i guess i can always upgrade if i start with a £3 peg board ;)06:29
xentracto add to deformations from temperature, temperature gradients, and mechanical stress, many plastics are hygroscopic, and those that aren't can usually absorb other solvents and swell06:29
xentractypical pegboard is mostly made of cellulose, which is very hygroscopic06:29
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xentrac.to chris_99 I think cellulose swells by about 100 με per percent relative humidity, so if you have a meter-wide mostly-cellulose pegboard that's adjusting to a 5% change in RH over an hour, it could increase or decrease in size by 500μm, or about 140 nm/s — about a quarter wavelength06:41
yoleauxxentrac: I'll pass your message to chris_99.06:41
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chris_99cheers, sorry my wifi is very dodgy06:47
yoleaux13:41Z <xentrac> chris_99: I think cellulose swells by about 100 με per percent relative humidity, so if you have a meter-wide mostly-cellulose pegboard that's adjusting to a 5% change in RH over an hour, it could increase or decrease in size by 500μm, or about 140 nm/s — about a quarter wavelength06:47
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kanzurepherecydes pharma / phagoburn (bacteriophage stuff)10:21
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kanzure"vibrio natriegens"10:50
kanzure.wik vibrio natriegens10:50
yoleaux"Vibrio natriegens is a Gram-negative marine bacterium. It was first isolated from salt marsh mud. It is a salt-loving organism (halophile) requiring about 2% NaCl for growth." — https://en.wikipedia.org/wiki/Vibrio_natriegens10:50
kanzure10 minute doubling time10:50
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fennkanzure see you in an hour?12:50
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ebowden+seen Douhet19:48
ebowdenOh, derp, wrong channel for that.19:48
Douhet>_>19:49
Douhetebowden, what channel did you want to use for that?19:49
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ebowdenOne that has no relation whatever for this one, it's not even on freenode.19:50
ebowdenhttp://repository.upenn.edu/cgi/viewcontent.cgi?article=1046&context=cbe_sdr19:55
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nmz787_i2450 020:06
nmz787_i.title http://hackaday.com/2016/07/07/tissue-engineered-soft-robot-swims-like-a-stingray/20:06
yoleauxTissue-Engineered Soft Robot Swims Like a Stingray | Hackaday20:06
nmz787_ioptogenetically engineered rat heart cells, laminated to gold sheet (acts as spring), coated with silicone... pulse with light=>swimming20:07
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kanzure.wik dip pen lithography20:54
yoleauxkanzure: Sorry, that command (.wik) crashed.20:54
kanzure.wik dip pen lithography20:54
yoleauxkanzure: Sorry, that command (.wik) crashed.20:54
kanzurehttp://bitcoinfibre.org/20:57
kanzurehttp://bluematt.bitcoin.ninja/2016/07/07/relay-networks/20:57
kanzurehttp://pencerw.com/feed/2015/3/15/3d-printing-titanium-and-the-bin-of-broken-dreams21:04
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nmz787"It is also important to consider one of the unique characteristics of DPN, namely its force independence. With virtually all ink/substrate combinations, the same feature size will be patterned no matter how hard the tip is pressing down against the surface.[23] As long as robust SiN tips are used, there is no need for complicated feedback electronics, no need for lasers, no need for quad photo-diodes, and no need for an AFM."21:07
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kanzureseanph: hi21:21
seanph@kanzure hey21:21
kanzuresup21:21
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kanzurehttp://nostalgebraist.tumblr.com/post/144815618009/imo-an-idea-that-should-be-more-widely-spread21:54
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--- Log closed Fri Jul 08 00:00:51 2016

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