2016-06-29.log

--- Log opened Wed Jun 29 00:00:43 2016
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chris_99can 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
TMAchris_99: my understanding is that cooling the device becomes a big problem soon04:36
chris_99co2 lasers seem to be water cooled i think, but i bet you need a hell of a lot of power to ionise air04:37
TMAchris_99: also, there are 4 kW CO2 lasers available (consuming 56 kW energy) http://digital.industrial-lasers.com/industriallasers/20140910?pg=23#pg2304:40
chris_99wow interesting, i'm guessing they're upwards of 20k$ though04:43
chris_99it sounds like it's UV that they seem to use04:48
chris_99.title https://www.osapublishing.org/optica/abstract.cfm?uri=optica-1-2-12504:53
yoleauxOSA | Channeling the electrical breakdown of air by optically heated plasma filaments04:53
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/74757218192042393605:33
yoleauxOur spinout company Expansion Technologies Inc. has a Twitter account! Follow @EXT_Bio to keep up with expansion microscopy kits/services. (@eboyden3)05:33
kanzurehmm https://twitter.com/EXT_Bio/followers05:35
kanzurehttp://www.extbio.com/05:36
gnushahttps://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
gnushahttps://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
xentracchris_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 distance06:27
xentracI mean this also depends on how big your electrolaser is!06:28
chris_99yeah, i need to read through that paper thoroughly06:28
xentracit helps a lot to use UV instead of heat though06:29
xentracI imagine it would also "help" to use UV that's close to a strong spectral absorption line06:29
kanzurexentrac: 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 microscale06:29
xentracbut while the optimal level of coupling is not 0, it's also not 1/1mm06:30
xentracif your laser is entirely absorbed by ionizing the first 10mm of air it isn't that useful as an electrolaser06:31
chris_99the fact they mention using microwaves06:31
chris_99sounds interesting06:31
chris_99too06:31
xentracthat seems less plausible to me06:32
xentracI 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 tip06:33
chris_99i wonder if you could use a microwave oven magnetron...06:33
xentracyou aren't going to be able to get even 1mm width out of a microwave beam06:33
chris_99ah gotcha. so focussing it would be the difficulty06:34
xentracright06:34
xentracalso you're going to need a *lot* of luminous flux to ionize air with microwaves06:35
xentracI mean illuminance06:35
xentracI don't know, that's not what I mean.  I mean power per unit area06:36
xentracirradiance06:36
chris_99heh i just found spectral irradiance too06:37
xentracyeah, I just mean total irradiance06:37
xentracso 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 unwieldy06:38
gnushahttps://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
gnushahttps://secure.diyhpl.us/cgit/diyhpluswiki/commit/?id=c3f93f76 Bryan Bishop: minor updates >> http://diyhpl.us/diyhpluswiki/transcripts/w3-blockchain-workshop-2016/intro/06:38
xentracwhen 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 tracks06:43
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xentrac(generated by separate lasers)06:48
chris_99expensive maybe? aren't femtosecond lasers very dear06:49
xentractheir 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 wavelengths06:50
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gnushahttps://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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xentracI 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 shelf07:58
chris_99seems you can buy rather than build - http://www.laserquantum.com/products/category.cfm?id=508:00
gnushahttps://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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gnushahttps://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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gnushahttps://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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gnushahttps://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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xentracchris_99: note that the lasers there have a pulse rate 100 million times faster than the ones they used in the experiment11:11
gnushahttps://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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gnushahttps://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
kanzure11:23 < CaptHindsight> kanzure: weren't these much more expensive only last year? http://www.glenresearch.com/Catalog/catalog.php?page=abi11:34
xentracchris_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_99hmm, as opposed to ionisation12:04
chris_99you mean12:04
chris_99or is that the same12:04
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gnushahttps://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
gnushahttps://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
gnushahttps://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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ybithttp://www.ribbonfarm.com/2016/06/29/the-daredevil-camera/16:11
chris_99was reading that, was really interesting16:11
ybitkanzure: i'd love a linkdump of anything related to reverse engineering. my setup for recalling links is profoundly broken these days16:13
delinquentmeSo. How would you guys make an image classification algo for guessing breast size16:16
delinquentmeserious question.16:16
chris_99using a single camera?16:17
ybithttps://github.com/jakeasmith/commit/16:17
delinquentmeno to crawl the internet for images16:19
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nmz787anyone doing any python C++ extensions in here?18:46
kanzurei maintain a few libraries that have C++ extensions in python... what's up.18:51
kanzurehttp://spectrum.ieee.org/the-human-os/biomedical/imaging/brain-scanning-just-got-very-good-and-very-unsettling18:54
xentracybit: I paste links into a text file in Emacs with hashtags18:54
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
kanzurexentrac: jotmuch18:57
xentracybit: most of the time my search engine is ^R18:57
kanzurehttps://neuroscienceblueprint.nih.gov/connectome/index.htm18:57
xentracoccasionally I use grep18:57
xentracI 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 wrap18:59
xentracI sync it using git18:59
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xentracI 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 conflicts19:01
kanzurexentrac: jotmuch lets you do boolean search stuff over tag sets19:01
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kanzurehttps://www.humanconnectome.org/data/19:08
gnushahttps://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/53297641736637235219:36
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
kanzurerecent stuff in robotics http://arxiv.org/abs/1606.0920519:41
xentracI just wrote another search thing20:08
xentracbut because it takes 2+ seconds to run on my netbook I probably won't use it20:08
xentrachttp://canonical.org/~kragen/sw/dev3/tagrep.py20:08
xentracdoing 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 wonky20:16
xentracnot real pretty code but it seems to work20:17
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nmz787kanzure: 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-f6bb882d65ea0e0dfd977b7dc4bc626bR55322:58
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nmz787I guess the bug could be in the code I didn't write: https://github.com/nmz787/pycosat/blob/01a73473612ed06f1144a5c23b3906bdc1fc45f1/pycosat.c#L7923:02
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--- Log closed Thu Jun 30 00:00:44 2016

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