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chris_99 | can anyone think of a reason why you couldn't create an electrolaser with say a 100W co2 laser, do you need much greater power to ionise air? | 04:34 |
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TMA | chris_99: my understanding is that cooling the device becomes a big problem soon | 04:36 |
chris_99 | co2 lasers seem to be water cooled i think, but i bet you need a hell of a lot of power to ionise air | 04:37 |
TMA | chris_99: also, there are 4 kW CO2 lasers available (consuming 56 kW energy) http://digital.industrial-lasers.com/industriallasers/20140910?pg=23#pg23 | 04:40 |
chris_99 | wow interesting, i'm guessing they're upwards of 20k$ though | 04:43 |
chris_99 | it sounds like it's UV that they seem to use | 04:48 |
chris_99 | .title https://www.osapublishing.org/optica/abstract.cfm?uri=optica-1-2-125 | 04:53 |
yoleaux | OSA | Channeling the electrical breakdown of air by optically heated plasma filaments | 04:53 |
chris_99 | "As a next step, the researchers are planning on using a microwave beam in place of the nanosecond laser to more efficiently heat the channel and perhaps achieve better results." | 04:58 |
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kanzure | .tw https://twitter.com/eboyden3/status/747572181920423936 | 05:33 |
yoleaux | Our spinout company Expansion Technologies Inc. has a Twitter account! Follow @EXT_Bio to keep up with expansion microscopy kits/services. (@eboyden3) | 05:33 |
kanzure | hmm https://twitter.com/EXT_Bio/followers | 05:35 |
kanzure | http://www.extbio.com/ | 05:36 |
gnusha | https://secure.diyhpl.us/cgit/diyhpluswiki/commit/?id=255e031b Bryan Bishop: w3: doug schepers intro >> http://diyhpl.us/diyhpluswiki/transcripts/w3-blockchain-workshop-2016/intro/ | 06:02 |
gnusha | https://secure.diyhpl.us/cgit/diyhpluswiki/commit/?id=1a1a3283 Bryan Bishop: w3: wendy w3c intro >> http://diyhpl.us/diyhpluswiki/transcripts/w3-blockchain-workshop-2016/wendy/ | 06:20 |
xentrac | chris_99: you don't need a lot of power to ionize air a little bit, and you only need to ionize it a little bit if it's over a long distance | 06:27 |
xentrac | I mean this also depends on how big your electrolaser is! | 06:28 |
chris_99 | yeah, i need to read through that paper thoroughly | 06:28 |
xentrac | it helps a lot to use UV instead of heat though | 06:29 |
xentrac | I imagine it would also "help" to use UV that's close to a strong spectral absorption line | 06:29 |
kanzure | xentrac: someone claims that ultrasound imaging is going to be provide higher resolution imaging of neuronal detail, compared to RF, due to problems with liquids and RF at microscale | 06:29 |
xentrac | but while the optimal level of coupling is not 0, it's also not 1/1mm | 06:30 |
xentrac | if your laser is entirely absorbed by ionizing the first 10mm of air it isn't that useful as an electrolaser | 06:31 |
chris_99 | the fact they mention using microwaves | 06:31 |
chris_99 | sounds interesting | 06:31 |
chris_99 | too | 06:31 |
xentrac | that seems less plausible to me | 06:32 |
xentrac | I mean ideally you would like your conductive pathway to be on the order of mean free path, no? in order to use less energy and have the best field strength at the tip | 06:33 |
chris_99 | i wonder if you could use a microwave oven magnetron... | 06:33 |
xentrac | you aren't going to be able to get even 1mm width out of a microwave beam | 06:33 |
chris_99 | ah gotcha. so focussing it would be the difficulty | 06:34 |
xentrac | right | 06:34 |
xentrac | also you're going to need a *lot* of luminous flux to ionize air with microwaves | 06:35 |
xentrac | I mean illuminance | 06:35 |
xentrac | I don't know, that's not what I mean. I mean power per unit area | 06:36 |
xentrac | irradiance | 06:36 |
chris_99 | heh i just found spectral irradiance too | 06:37 |
xentrac | yeah, I just mean total irradiance | 06:37 |
xentrac | so even if your microwave emitter is 10× more efficient than a laser, which should be easy to arrange, you're going to suffer from things being unwieldy | 06:38 |
gnusha | https://secure.diyhpl.us/cgit/diyhpluswiki/commit/?id=6e811200 Bryan Bishop: add slides link >> http://diyhpl.us/diyhpluswiki/transcripts/w3-blockchain-workshop-2016/wendy/ | 06:38 |
gnusha | https://secure.diyhpl.us/cgit/diyhpluswiki/commit/?id=c3f93f76 Bryan Bishop: minor updates >> http://diyhpl.us/diyhpluswiki/transcripts/w3-blockchain-workshop-2016/intro/ | 06:38 |
xentrac | when I see sentences like The plasma channel appears to be long, but in fact its instantaneous extent is not more than few meters" I wonder why they don't just send several pulses tens of nanoseconds apart down nearby parallel tracks | 06:43 |
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xentrac | (generated by separate lasers) | 06:48 |
chris_99 | expensive maybe? aren't femtosecond lasers very dear | 06:49 |
xentrac | their setup with the dichroic overlapping mirror demonstrates a way you could send several pulses tens of nanoseconds apart down the same track actually, if they were all of different wavelengths | 06:50 |
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gnusha | https://secure.diyhpl.us/cgit/diyhpluswiki/commit/?id=8151f0c6 Bryan Bishop: transcript: christopher allen session >> http://diyhpl.us/diyhpluswiki/transcripts/w3-blockchain-workshop-2016/christopher-allen/ | 07:24 |
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xentrac | I don't actually know how expensive femtosecond lasers are; I have the impression that they're still not a thing you just buy off the shelf | 07:58 |
chris_99 | seems you can buy rather than build - http://www.laserquantum.com/products/category.cfm?id=5 | 08:00 |
gnusha | https://secure.diyhpl.us/cgit/diyhpluswiki/commit/?id=f3eac3ff Bryan Bishop: transcript: arvind narayanan >> http://diyhpl.us/diyhpluswiki/transcripts/w3-blockchain-workshop-2016/arvind-narayanan/ | 08:01 |
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gnusha | https://secure.diyhpl.us/cgit/diyhpluswiki/commit/?id=026b45d3 Bryan Bishop: transcript: privacy and anonymity group >> http://diyhpl.us/diyhpluswiki/transcripts/w3-blockchain-workshop-2016/privacy-anonymity-and-identity-group/ | 10:04 |
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gnusha | https://secure.diyhpl.us/cgit/diyhpluswiki/commit/?id=3037046b Bryan Bishop: transcript: groups on identity >> http://diyhpl.us/diyhpluswiki/transcripts/w3-blockchain-workshop-2016/groups-identity/ | 10:46 |
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gnusha | https://secure.diyhpl.us/cgit/diyhpluswiki/commit/?id=cece50eb Bryan Bishop: transcript: archival science >> http://diyhpl.us/diyhpluswiki/transcripts/w3-blockchain-workshop-2016/archival-science/ | 11:09 |
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xentrac | chris_99: note that the lasers there have a pulse rate 100 million times faster than the ones they used in the experiment | 11:11 |
gnusha | https://secure.diyhpl.us/cgit/diyhpluswiki/commit/?id=00953bf7 Bryan Bishop: transcript: kenji saito >> http://diyhpl.us/diyhpluswiki/transcripts/w3-blockchain-workshop-2016/blockchain-hub/ | 11:14 |
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gnusha | https://secure.diyhpl.us/cgit/diyhpluswiki/commit/?id=8a2c979a Bryan Bishop: transcript: about royalties stuff >> http://diyhpl.us/diyhpluswiki/transcripts/w3-blockchain-workshop-2016/royalties/ | 11:26 |
kanzure | 11:23 < CaptHindsight> kanzure: weren't these much more expensive only last year? http://www.glenresearch.com/Catalog/catalog.php?page=abi | 11:34 |
xentrac | chris_99: otoh if you can actually send your 100-fs or 60-fs pulses at intervals of a nanosecond (or, better, 10ns or 20ns), then maybe you don't need the ignition/heating approach and can just use the DC joule heating of the air? | 11:38 |
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chris_99 | hmm, as opposed to ionisation | 12:04 |
chris_99 | you mean | 12:04 |
chris_99 | or is that the same | 12:04 |
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gnusha | https://secure.diyhpl.us/cgit/diyhpluswiki/commit/?id=8c45f6b1 Bryan Bishop: transcript: physical assets >> http://diyhpl.us/diyhpluswiki/transcripts/w3-blockchain-workshop-2016/physical-assets/ | 12:34 |
gnusha | https://secure.diyhpl.us/cgit/diyhpluswiki/commit/?id=8d3bd185 Bryan Bishop: some more words >> http://diyhpl.us/diyhpluswiki/transcripts/w3-blockchain-workshop-2016/physical-assets/ | 13:08 |
gnusha | https://secure.diyhpl.us/cgit/diyhpluswiki/commit/?id=b0ab4062 Bryan Bishop: transcript: provenance summaries >> http://diyhpl.us/diyhpluswiki/transcripts/w3-blockchain-workshop-2016/provenance-groups/ | 13:08 |
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kanzure | "bioviva issues shares on waves blockchain platform for gene therapy company"4~~ | 13:54 |
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ybit | http://www.ribbonfarm.com/2016/06/29/the-daredevil-camera/ | 16:11 |
chris_99 | was reading that, was really interesting | 16:11 |
ybit | kanzure: i'd love a linkdump of anything related to reverse engineering. my setup for recalling links is profoundly broken these days | 16:13 |
delinquentme | So. How would you guys make an image classification algo for guessing breast size | 16:16 |
delinquentme | serious question. | 16:16 |
chris_99 | using a single camera? | 16:17 |
ybit | https://github.com/jakeasmith/commit/ | 16:17 |
delinquentme | no to crawl the internet for images | 16:19 |
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nmz787 | anyone doing any python C++ extensions in here? | 18:46 |
kanzure | i maintain a few libraries that have C++ extensions in python... what's up. | 18:51 |
kanzure | http://spectrum.ieee.org/the-human-os/biomedical/imaging/brain-scanning-just-got-very-good-and-very-unsettling | 18:54 |
xentrac | ybit: I paste links into a text file in Emacs with hashtags | 18:54 |
kanzure | "9.5 petabytes of imaging data. The data set includes scans of brain activity while individuals are at rest and while doing tasks. It also contains structural scans with information on the size and shape of the folds of the brain in the cortex, the trajectories of local and long-distance neuronal fibers traversing the brain’s white matter, and more." | 18:57 |
kanzure | xentrac: jotmuch | 18:57 |
xentrac | ybit: most of the time my search engine is ^R | 18:57 |
kanzure | https://neuroscienceblueprint.nih.gov/connectome/index.htm | 18:57 |
xentrac | occasionally I use grep | 18:57 |
xentrac | I edit the file in longlines-mode with longlines-show-hard-newlines enabled and longlines-show-effect set to "\n\n" so that hard newlines are paragraph breaks and I get word wrap | 18:59 |
xentrac | I sync it using git | 18:59 |
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xentrac | I leave blank lines between days and a header on each section, which is a bit suboptimal with git because if I let different machiens get out of sync I always have to resolve conflicts | 19:01 |
kanzure | xentrac: jotmuch lets you do boolean search stuff over tag sets | 19:01 |
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kanzure | https://www.humanconnectome.org/data/ | 19:08 |
gnusha | https://secure.diyhpl.us/cgit/diyhpluswiki/commit/?id=79359549 Bryan Bishop: update to be more accurate >> http://diyhpl.us/diyhpluswiki/transcripts/w3-blockchain-workshop-2016/wendy/ | 19:16 |
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kanzure | .tw https://twitter.com/YourPaperSucks/status/532976417366372352 | 19:36 |
yoleaux | “I am afraid this manuscript may contribute not so much towards the field’s advancement as much as toward its eventual demise.” (@YourPaperSucks) | 19:36 |
kanzure | recent stuff in robotics http://arxiv.org/abs/1606.09205 | 19:41 |
xentrac | I just wrote another search thing | 20:08 |
xentrac | but because it takes 2+ seconds to run on my netbook I probably won't use it | 20:08 |
xentrac | http://canonical.org/~kragen/sw/dev3/tagrep.py | 20:08 |
xentrac | doing a bunch of regexp matching on a megabyte of text is probably the bottleneck there, although it's a bit hard to tell because perf measurements on this netbook are wonky | 20:16 |
xentrac | not real pretty code but it seems to work | 20:17 |
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nmz787 | kanzure: can't tell if the code I added is doing something apparently bad with book-keeping the Python related data since it crashes when RAM gets to just under 4GB, while in this method, I'm guessing around this line: https://github.com/nmz787/pycosat/commit/01a73473612ed06f1144a5c23b3906bdc1fc45f1#diff-f6bb882d65ea0e0dfd977b7dc4bc626bR553 | 22:58 |
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nmz787 | I guess the bug could be in the code I didn't write: https://github.com/nmz787/pycosat/blob/01a73473612ed06f1144a5c23b3906bdc1fc45f1/pycosat.c#L79 | 23:02 |
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--- Log closed Thu Jun 30 00:00:44 2016 |
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