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| nmz787_ | op-amp topology cheatsheet: http://chemelec.com/Projects/Op-Amp/Op-Amp.png | 02:30 |
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| chris_99 | http://sensl.com/ is interesting, i didn't know you could get silicon photomultipliers commercially | 03:53 |
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| kanzure | hmm. | 08:05 |
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| maaku | must assume tor is now compromised :( | 11:39 |
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| superkuh | I don't think so. But I think the type of naturally occurring cultural infection causing the drama will leave it open to outside compromise. | 11:46 |
| maaku | eh, character assasination in the court of public opinion, followed by a cabal of the accursors taking over displaced positions of power? | 11:48 |
| maaku | it's classic strategy for organization compromise | 11:48 |
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| kanzure | yep | 11:57 |
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| nmz787_ | well if tor is so affected by politics or bitchfests (I have no idea what you guys are talking about aside from the history of comments I've seen in here)... then seems like that software wasn't very 'secure' to begin with. | 12:03 |
| maaku | nmz787_: we're talking about the organization, not the software | 12:05 |
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| maaku | but tor was never so trustless... you trust the organization to gate new relay and exit nodes | 12:06 |
| maaku | so an organizational compromise IS a compromise of tor the software | 12:06 |
| chris_99 | what kind of changes to the software could they make, that wouldn't be obvious | 12:08 |
| maaku | none. they don't need to. you're anonymity of tor is due to the presumed independence and honesty of the relay network, which is hand crafted by the tor organization (your node downloads a signed list of relay nodes) | 12:08 |
| chris_99 | hmm, anyone can be a relay node right | 12:09 |
| chris_99 | so it's not just the tor people you trust | 12:10 |
| maaku | chris_99: tor clients download a list of reliable relay nodes from master nodes controlled by the tor organization | 12:10 |
| maaku | it is not p2p | 12:10 |
| maaku | (Today you learned!) | 12:10 |
| chris_99 | but i thought anyone can be a relay node, like anyone can get added to it? | 12:11 |
| maaku | if that were the case it'd be trivial to attack tor by sybil nodes | 12:11 |
| saturn2 | the process is mostly automated but the list is still controlled by the tor project | 12:12 |
| chris_99 | ah, gotcha | 12:12 |
| nmz787_ | got at least one reasonable looking image from my BRL-CAD ray-tracer interrogation method for rastering model slices | 12:14 |
| nmz787_ | now to refactor it into the python-BRLCAD-tcl library, and then work on g-code or maybe FIB output actually | 12:17 |
| nmz787_ | I wanted to try that weird metalense thing | 12:18 |
| nmz787_ | but also wanted to try the photolithography for a basic colored fluid pump... so that would require g-code | 12:19 |
| kanzure | what makes the pump colored? | 12:29 |
| streety | isn't the fluid colored? | 12:31 |
| kanzure | oh. | 12:34 |
| kanzure | but.. | 12:34 |
| nmz787_ | yeah | 12:37 |
| nmz787_ | I figured I'd have one of those 'start it up and [insert slogan of choice] becomes apparent' kind of proof of concept things | 12:37 |
| nmz787_ | huh, you could use that principle with drinking water or something, water filter output... and when algae/biofilm starts to develop your slogan could become obvious/apparent | 12:38 |
| streety | ideas on logo? | 12:39 |
| streety | that seems quite drawn out | 12:39 |
| nmz787_ | idk, DIYbio or hplusroadmap or something | 12:39 |
| streety | what sort of pump were you planning on? | 12:39 |
| nmz787_ | tiny peristaltic | 12:39 |
| nmz787_ | (the water filter/biofilm idea I mentioned wouldn't have pumps... it would just be some tubes in a logo fashion in a clear material that would obviously change if any biofilm grew) | 12:40 |
| streety | have you seen anything on hplc with the pump part of the microfluidic device? Everything I've seen uses a standard hplc pump and just connects it up to a microfluidic device | 12:41 |
| nmz787_ | hmm, well HPLC is pretty high pressure, I am pretty sure at least 10X if not 50X higher than most microfluidics... I bet there are some people experimenting with super-high-pressures in tiny environs | 12:43 |
| nmz787_ | i'd look up 'supercritical microfluidic' or 'subcritical microfluidic pump' or something | 12:43 |
| nmz787_ | this is a rendering of the pump model, with some tube 'leads' attached to each input/output: https://github.com/nmz787/python-brlcad-tcl/blob/master/examples/output/microfluidic_pump.stl | 12:44 |
| chris_99 | neat, github displays the stl | 12:45 |
| streety | I was thinking the same | 12:45 |
| streety | the microfluidic hplc has been something I've been thinking about recently. Not sure I will do anything with it but I'll add those keywords to my research | 12:46 |
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| kanzure | you can also use centrifugal force with microfluidics for separation | 12:49 |
| kanzure | and flow fractionation and size fractionation and a few other insane things | 12:49 |
| kanzure | http://diyhpl.us/~bryan/papers2/microfluidics/ | 12:49 |
| nmz787_ | streety: I guess something to consider is hydraulic advantage... you can have a microns-scale pump, and as long as the material you neck-down (reduce the cross-section of the fluidic) can handle the pressure, I think that might work to give you higher pressures in the smaller regions (I could be totally wrong about this, I don't really have much experience with hydraulics other than bleeding brakes or clutches in automobiles) | 12:49 |
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| streety | I'm probably not too far off then as I was thinking along the same lines. A piston with a large area on the low pressure side and a small area on the high pressure side. Trading volume for pressure. Presumably you could have multiple stages progressively raising the pressure. | 12:56 |
| streety | I've seen a couple of articles using a photoactivated polymer to cast the piston in situ | 12:57 |
| nmz787_ | I'd guess that model I showed might work, with low efficiency or something | 13:03 |
| streety | would you not be limited to the pressure applied to the three cross channels? | 13:03 |
| nmz787_ | uhh, hmm... maybe you have parallelized first-stages, which then act as pump-pressure for the next stage | 13:05 |
| nmz787_ | fluidic amplifiers? you need more 'current' at lower pressure, to get high pressure but with lower 'current' | 13:05 |
| nmz787_ | or some MEMS thing | 13:06 |
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| kanzure | genehacker was in here a few days ago wanting to do a fluidic radio thingy | 13:19 |
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| chris_99 | fluidic radio thing? | 13:23 |
| kanzure | yeah at least some have been done with liquid metal stuff | 13:28 |
| chris_99 | ahh | 13:29 |
| kanzure | i don't seem to have any references on this. how embarrassing. | 13:29 |
| kanzure | 13:30 < genehacker> so we can build a probe that has some fluidic logic and sensors and stuff and it can do science | 13:33 |
| kanzure | 13:30 < genehacker> problem is getting data back | 13:33 |
| kanzure | 13:31 < genehacker> so I'm thinking maybe I can use said fluidics to modulate the radar cross section of said probe | 13:33 |
| kanzure | 13:32 < genehacker> so we can hit it with radar, look at how the cross section changes and get data back | 13:33 |
| kanzure | hmm that's not usually what he's on about | 13:33 |
| nmz787_ | I responded to him too | 13:34 |
| nmz787_ | didn't find too much on the terms I searched, but didn't spend too much and it was probably late | 13:34 |
| pasky | kanzure: sorry behind polar circle now, but never really worked with multiple gpus | 13:34 |
| chris_99 | oh interesting, so the RF would tell you the parts of the chip with fluid in? | 13:34 |
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| kanzure | http://diyhpl.us/~bryan/papers2/microfluidics/Stretchable%20microfluidic%20radiofrequency%20antennas.pdf | 13:36 |
| kanzure | chris_99: for genehacker's radar idea, yes it seems to be something like "cause large-scale structural changes that can be detected by [orbital?] radar" | 13:36 |
| chris_99 | gotcha. Ive seen those mercury antennas before, they sound really interesting | 13:37 |
| kanzure | "A reconfigurable liquid metal antenna driven by electrochemically controlled capillarity" https://www.researchgate.net/profile/Mohammad_Khan157/publication/277929374_A_reconfigurable_liquid_metal_antenna_driven_by_electrochemically_controlled_capillarity/links/55e6374208aec74dbe74e535.pdf | 13:38 |
| jcorgan | you probably don't need to go to such great lengths | 13:40 |
| jcorgan | RFIDs signal data bits by changing their impedance, causing a reflected wave to be modulated | 13:41 |
| jcorgan | http://www.eetimes.com/document.asp?doc_id=1276306 | 13:41 |
| jcorgan | so you could probably adapt such a technique for this, but with either this or traditional radar the signal power required would be enormous | 13:42 |
| nmz787_ | chris_99: have you heard of RF retroreflectors? | 13:45 |
| chris_99 | i don't think so | 13:45 |
| nmz787_ | .title https://www.youtube.com/watch?v=mAai6dRAtFo | 13:46 |
| yoleaux | DEF CON 22 - Michael Ossmann - The NSA Playset: RF Retroreflectors - YouTube | 13:46 |
| kanzure | jcorgan: genehacker was thinking about venus in particular | 13:46 |
| chris_99 | nmz787_, cheers, will have a looky | 13:46 |
| kanzure | pasky: looks like, for multi-gpu data parallelism (multi-gpu training), folks are just averaging all the weights together.... i feel highly uncomfortable about this. | 13:47 |
| nmz787_ | where do I get this? http://dl.acm.org/citation.cfm?id=2540485 | 13:48 |
| nmz787_ | .title | 13:48 |
| yoleaux | 403 - Forbidden Access to The Digital Library | 13:48 |
| nmz787_ | " | 13:48 |
| nmz787_ | Accelerated robust point cloud registration in natural environments through positive and unlabeled learning" | 13:48 |
| kanzure | nmz787_: http://www2.ift.ulaval.ca/~pgiguere/papers/IJCAI2013.pdf | 13:48 |
| nmz787_ | oh, http://www.aaai.org/ocs/index.php/IJCAI/IJCAI13/paper/download/6848/7076 | 13:48 |
| jcorgan | or just add .sci-hub.bz to url domain | 13:49 |
| chris_99 | nmz787_, oh interesting, so you energise a circuit, and it emits RF back? | 13:49 |
| chris_99 | is that kind of what RFID does? | 13:49 |
| jcorgan | very similar | 13:49 |
| nmz787_ | man, I really need to get a wall-poster or math symbols to be able to translate these kind of papers to python, etc | 13:51 |
| nmz787_ | wall-poster OF math symbols | 13:51 |
| jcorgan | the signal received by an antenna will be re-radiated back out at an amplitude and phase dependent on the impedance of the circuit it is attached to | 13:51 |
| nmz787_ | huh, very cool | 13:53 |
| chris_99 | oh, this is the thing, where they use a high power CW transmitter | 13:53 |
| chris_99 | right? | 13:53 |
| jcorgan | yes | 13:53 |
| chris_99 | ah yeah i think i recall it now | 13:53 |
| jcorgan | think of the RFID tag you use for highway tolls collection | 13:54 |
| nmz787_ | if I made some kind of microfluidic, I think mossmann is local enough that I could find him/someone he works with to test out i.e. saltwater vs normal water | 13:54 |
| chris_99 | nmz787_, check this http://arxiv.org/abs/1606.01196 'The Desktop Muon Detector' uses SiPM apparently | 13:54 |
| nmz787_ | like a pulse train of salinity | 13:55 |
| nmz787_ | hmm, what is the sensor? | 13:56 |
| nmz787_ | from sensl.com ? | 13:56 |
| chris_99 | i think so | 13:57 |
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| nmz787_ | huh | 13:58 |
| chris_99 | it's a SiPM | 13:58 |
| nmz787_ | it might be worth trying one of those with some phosphor to make a monochromator or something | 13:59 |
| nmz787_ | (or for my xray detection project) | 13:59 |
| chris_99 | oh cool, do you have an x-ray tube? | 13:59 |
| nmz787_ | nah, but FIB beams induce bremstralung x-ray formation | 14:00 |
| chris_99 | ah interesting, do FIB machines, detect x-rays?, i thought they used an electron gun and detected electrons | 14:02 |
| nmz787_ | if you have an x-ray detector they both can (FIB or SEM) | 14:03 |
| chris_99 | and you mean you can get an image of what you're scanning with that? | 14:03 |
| nmz787_ | SEM shoots electrons which interact and cause photons to be emitted, FIB shoots atoms which posses electrons which upon impact interact with the electrons of the impacted material and then photons are emitted | 14:04 |
| chris_99 | yeah, i mean the x-rays, you can obtain images with that? | 14:04 |
| nmz787_ | well image is usually detected with electrons... but there are definitely direct-ion imagers/detectors (since ions are charged) | 14:05 |
| nmz787_ | you can make an x-ray emission map, sure | 14:05 |
| chris_99 | ah neat | 14:05 |
| nmz787_ | and call it am image | 14:05 |
| nmz787_ | .wik x-ray microprobe | 14:05 |
| yoleaux | nmz787_: Sorry, that command (.wik) crashed. | 14:05 |
| nmz787_ | .wik Electron microprobe | 14:06 |
| yoleaux | "An electron microprobe (EMP), also known as an electron probe microanalyzer (EPMA) or electron micro probe analyzer (EMPA), is an analytical tool used to non-destructively determine the chemical composition of small volumes of solid materials." — https://en.wikipedia.org/wiki/Electron_microprobe | 14:06 |
| chris_99 | cool, never heard of that before | 14:06 |
| nmz787_ | slower but more resolution: Energy-dispersive X-ray spectroscopy | 14:07 |
| nmz787_ | .wik Energy-dispersive X-ray spectroscopy | 14:07 |
| yoleaux | "Energy-dispersive X-ray spectroscopy (EDS, EDX, or XEDS), sometimes called energy dispersive X-ray analysis (EDXA) or energy dispersive X-ray microanalysis (EDXMA), is an analytical technique used for the elemental analysis or chemical characterization of a sample. It relies on an interaction of some source of X-ray excitation and a …" — https://en.wikipedia.org/wiki/Energy-dispersive_X-ray_spectroscopy | 14:07 |
| nmz787_ | basically uses a monochromator I think | 14:07 |
| nmz787_ | so scans to get res, but is slower... also beam-dwell of electrons/ions will cause sample destruction eventually | 14:07 |
| chris_99 | ahh | 14:08 |
| nmz787_ | so then you can try lowering the voltage of your e-beam to do electron energy loss spectroscopy | 14:08 |
| nmz787_ | .wik electron energy loss spectroscopy | 14:08 |
| yoleaux | "In electron energy loss spectroscopy (EELS) a material is exposed to a beam of electrons with a known, narrow range of kinetic energies. Some of the electrons will undergo inelastic scattering, which means that they lose energy and have their paths slightly and randomly deflected." — https://en.wikipedia.org/wiki/Electron_energy_loss_spectroscopy | 14:08 |
| nmz787_ | I think you can also do something with charge conduction... where at each spot you ramp the voltage and record the point at which the rate of conduction is saturated | 14:09 |
| nmz787_ | different materials will have different properties | 14:09 |
| nmz787_ | something like that | 14:10 |
| chris_99 | https://en.wikipedia.org/wiki/Electron_spectrometer thats intriguing, so you measure how much the electrons bend | 14:12 |
| chris_99 | does anyone know if you can actually commercially buy a single photon source off the shelf, or are they either ridiculously expensive or.. | 14:14 |
| nmz787_ | I saw this http://hackaday.com/2016/05/07/single-photon-source-for-quantum-computing-and-experimentation/ | 14:21 |
| chris_99 | i think cambridge created a single photon led, not sure what temperature theirs requires though. I'm just reading a bit about quantum dots and how they relate to single photon sources | 14:23 |
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| pasky | kanzure: it sounds a bit crazy; do they at least do that & sync after each N batches? based on https://github.com/BVLC/caffe/blob/master/docs/multigpu.md caffe just averages the gradient, not the weights | 14:42 |
| kanzure | hmm. | 14:43 |
| kanzure | i saw one that syncs after each training round | 14:43 |
| pasky | (i.e. it is like if you had k-times larger batch) | 14:43 |
| kanzure | i'ts possible that i'm wrong... maybe averaging weights, averaging the models, etc. is somehow the right thing to do..... i don't know. | 14:44 |
| kanzure | it's certainly a cool result if it works....... | 14:44 |
| pasky | that sounds unlikely to me, the local optima can be very different weight configurations | 14:44 |
| pasky | on the other hand if you average often enough, it may not disrupt the convergence too much | 14:45 |
| kanzure | "stochastic gradient descent" | 14:45 |
| kanzure | "One weird trick for parallelizing convolutional neural networks" http://arxiv.org/pdf/1404.5997.pdf | 14:45 |
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| kanzure | "GeePS: Scalable deep learning on distributed GPUs with a GPU-specialized parameter server" http://www.istc-cc.cmu.edu/publications/papers/2016/GeePS-cui-eurosys16.pdf | 14:52 |
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| kanzure | gene_hacker: streety and nmz787_ were thinking about some microfluidic liquid chromatography stuff, pump stuff and photoactivated polymers | 14:59 |
| nmz787_ | hi gene_hacker | 15:00 |
| streety | averaging the gradient would seem to make more sense than the weights. Maybe it works out to be the same in the end. The parallelization I've done has been cross-validating a model architecture using multiple GPUs. | 15:09 |
| streety | Easy approach for quick gains | 15:10 |
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| kanzure | .wik bulk synchronous parallel | 15:14 |
| yoleaux | "The Bulk Synchronous Parallel (BSP) abstract computer is a bridging model for designing parallel algorithms. It serves a purpose similar to the Parallel Random Access Machine (PRAM) model. BSP differs from PRAM by not taking communication and synchronization for granted." — https://en.wikipedia.org/wiki/Bulk_synchronous_parallel | 15:14 |
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| kanzure | wtf. researchgate emails me after they saw me loading that last pdf link in here. | 15:18 |
| kanzure | and they specifically reference that document | 15:18 |
| kanzure | this is the most insanely draconian science site i have ever seen | 15:19 |
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| nmz787_ | whoo, I think I have rastering! | 15:34 |
| nmz787_ | http://gifmaker.cc/PlayGIFAnimation.php?folder=2016082109xmUPfh351sTmeLbHTBEyG9&file=output_Wqx5Ua.gif | 15:41 |
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| nmz787_ | http://i.imgur.com/Kb20d7u.gif | 15:52 |
| nmz787_ | if the last one didn't work | 15:52 |
| chris_99 | what is it? | 15:53 |
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| nmz787_ | same model, the microfluidic pump example | 15:53 |
| nmz787_ | just each slice has been turned into a rastered bitmap | 15:54 |
| nmz787_ | looking down in the Z axis at the model | 15:54 |
| nmz787_ | in this case I have 6 layers for the model... but in practice I think this model needs fabbed with only 2 layers | 15:54 |
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| nmz787_ | or maybe I need another layer between the top pneumatic channels and the lower pumped-channel | 15:56 |
| chris_99 | i'm not sure what a microfluidic pump is, is there a video of one, you'd recommend | 15:56 |
| nmz787_ | yielding 2 patterned layers, a spacer layer, and the top layer | 15:56 |
| nmz787_ | err, the top layer being one of the patterened layers | 15:57 |
| chris_99 | https://www.youtube.com/watch?v=VryS7LvjWaA is it something like this? | 15:57 |
| nmz787_ | it is just like your 3 fingers pressing a tube of tooth-paste | 15:57 |
| nmz787_ | one after the other | 15:57 |
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| nmz787_ | causes flow in one direction | 15:57 |
| chris_99 | ah ok, so what are you using, some kind of solenoid? | 15:58 |
| nmz787_ | https://en.wikipedia.org/wiki/Peristaltic_pump | 15:58 |
| chris_99 | oh, ive seen those | 15:58 |
| nmz787_ | not sure why the linear pump they have isn't animated, sorry | 15:58 |
| chris_99 | oh neat, i hadn't seeen the linear style | 15:59 |
| chris_99 | one thouse | 15:59 |
| chris_99 | *though | 15:59 |
| nmz787_ | the top 3 'finger' channels are pneumatic, they expand downward and cut off flow in the lower tube (perpedicular) | 16:00 |
| chris_99 | so it literally pushes different parts of the microfluidic chip? | 16:00 |
| nmz787_ | if you expand them one after another, it causes flow | 16:00 |
| nmz787_ | yeah | 16:01 |
| chris_99 | cool | 16:01 |
| nmz787_ | the channels can be solid, and the interface either silicone or very-thin glass which can flex enough to cut off a very shallow channel below it | 16:01 |
| nmz787_ | or everything can be silicone | 16:02 |
| chris_99 | ahh | 16:02 |
| chris_99 | so i'm a bit confused, what's the advantage of a peristaltic style pump, over just forcing the liquid through with a syringe? | 16:03 |
| chris_99 | oh is it the fact you can build it all as part of the single chip, rather than needing external hardware | 16:05 |
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| streety | I think you still need external hardware to pressurize the three fingers | 16:11 |
| chris_99 | hmm true | 16:12 |
| streety | probably get some metering ability | 16:12 |
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| nmz787_ | well they are also composed of 3 valves... and valves are useful in general to be able to make. | 16:21 |
| nmz787_ | but a macro air valve can probably control lots of micro pumps | 16:21 |
| nmz787_ | so you can probably drive 10s or 100s of parallelized stuff with the same macro stuff | 16:21 |
| chris_99 | ahh | 16:21 |
| chris_99 | cool | 16:21 |
| chris_99 | are you planning on fabricating your chip, yourself? | 16:23 |
| nmz787_ | and yeah metering, if you can control the size of the pump, and number of 'fingers', you can control output flow and ripple more or less finely | 16:23 |
| nmz787_ | yeah, I have a spin coater and a laser etcher CNC | 16:23 |
| nmz787_ | (unfortunately they are not mated to each other) | 16:23 |
| streety | don't you need the line to each finger to be individually addressed? | 16:23 |
| chris_99 | what's the spin coater used for in this context? to lay down a very clean amount of the PDMS or whatnot? | 16:25 |
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| streety | I think it may also be used to apply a layer of photoresist | 16:26 |
| streety | not sure what nmz787_ has planned though | 16:26 |
| nmz787_ | streety: yeah, but you can hook line A up to many 'needs actuated finger A's | 16:26 |
| nmz787_ | chris_99: yeah photoresist, then that gets exposed with laser, then use as-is possibly or cast PDMS on, then peel off and sandwich | 16:27 |
| streety | good point | 16:28 |
| nmz787_ | chris_99: also though, I want to convert exported rasters to the FIB tool format, so I can etch things with that... and maybe possibly do deposition | 16:28 |
| streety | can you then block individual pumps with another line? | 16:28 |
| chris_99 | ahh, could you use it to directly spin the PDMS, and etch directly? or would that not work | 16:28 |
| nmz787_ | streety: yeah I guess if it was called for, sure | 16:28 |
| nmz787_ | I've read of multiplexers | 16:28 |
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| nmz787_ | but I think there is probably some kind of max-levels of valving/muxing you can do, before you lose strength | 16:29 |
| nmz787_ | I want to translate this to use my BRL-CAD python lib: https://gist.github.com/nmz787/83a826ca4d40011262e7382b46c22570 | 16:32 |
| nmz787_ | which outputted this http://imgur.com/PKFXtCV | 16:32 |
| nmz787_ | based on this http://www.seas.harvard.edu/capasso/wp-content/uploads/publications/sciencejune3-2016.pdf | 16:32 |
| nmz787_ | Metalenses at visible wavelengths: Diffraction-limited focusing and subwavelength resolution imaging | 16:33 |
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| nmz787_ | I want to try simply FIBbing some silicon then coating it with gold or maybe imprinting it into some plexiglass | 16:34 |
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| chris_99 | neat! Does your spin coater (or spin coaters in general) have a way of measuring the thickness of what you spin | 16:36 |
| chris_99 | so you could spin for a specific duration etc | 16:36 |
| chris_99 | until it hits a certain thickness | 16:37 |
| nmz787_ | nah, you have to do that with another machine, I guess in some high-volume setups they may be integrated | 16:41 |
| chris_99 | ah gotcha | 16:41 |
| chris_99 | i was trying to find which came first spin art, or spin coating ;) but can't seem to find a decent history of spin coating | 16:42 |
| nmz787_ | either go through curing then cut and image it, or you use an interferometer on the gel/thin-film, or I think another way too, time of flight or something maybe | 16:42 |
| chris_99 | mmm | 16:43 |
| chris_99 | i was thinking if you had a laser or something point at it, during the spining | 16:43 |
| nmz787_ | yeah maybe it is just deflection | 16:43 |
| nmz787_ | the last tech I was thinking of | 16:43 |
| chris_99 | would it be fairly easy to diy a spin coater, or is there some complex aspects im not thinking of, like precise motor control | 16:44 |
| streety | there is a video on the applied science channel | 16:45 |
| streety | https://www.youtube.com/watch?v=321tptQ8PrU | 16:46 |
| chris_99 | cheers | 16:46 |
| kanzure | .title | 16:46 |
| yoleaux | Design and build a spin coater - YouTube | 16:46 |
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| chris_99 | i love krasnows stuff | 16:46 |
| chris_99 | so for making the microfluidic slide, you say you spin the photoresist, then you pour the PDMS into it, i guess? does that mean you then have to spin a layer of PDMS too, to cover the bottom part of the slide? | 16:48 |
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| streety | I think you peel the PDMS layer off after it has set and then apply that | 16:52 |
| nmz787_ | spin resist, pattern resist, develop resist, pour on silicone and spin (I think, or maybe people usually just pour and let it settle/self-level with gravity) then peel off. | 16:55 |
| nmz787_ | for the interface layer, I think people just spin silicone, then cure it, then peel and use it for the in-between layer | 16:56 |
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| chris_99 | sorry im confused what covers the slide? so the liquid doesn't fall out i mean. is the interface layer the thing that does that? | 17:03 |
| nmz787_ | that or a glass microscope slide | 17:04 |
| nmz787_ | or a combination depending on your sandwich of layers | 17:05 |
| chris_99 | gotcha | 17:05 |
| chris_99 | do you have to use a vacuum chamber for the resin to degas it, prior to spinning | 17:05 |
| nmz787_ | ideally yeah | 17:13 |
| nmz787_ | here's a grey-scaled output, based on the thickness of the region in the slice: http://imgur.com/a/HKjKW | 17:30 |
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| nmz787_ | even finer slices, with grey-scale: https://giphy.com/gifs/iARXASzJvXR3W | 18:12 |
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| kanzure | bloop | 21:50 |
| andytoshi | blop | 21:52 |
| kanzure | hm. | 21:53 |
| kanzure | where is eudoxia | 22:19 |
| kanzure | nevermind. seems that he was alive at least 8 days ago. | 22:19 |
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| nmz787_ | welp, got the raster export committed! | 23:21 |
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| nmz787_ | .tell abetusk I implemented raster generation from BRL-CAD model slices... would love some tips for getting the points exported to G-code: https://github.com/nmz787/python-brlcad-tcl | 23:32 |
| yoleaux | nmz787_: I'll pass your message to abetusk. | 23:32 |
| --- Log closed Mon Aug 22 00:00:32 2016 | ||
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