2016-06-14.log

--- Log opened Tue Jun 14 00:00:29 2016
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archels.title neuroinf.org02:45
yoleauxneuroinf.org02:45
fennbad url?02:56
archelsI think it's down, my email to comp-neuro bounced02:58
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kanzurehrm03:48
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FourFire.oed www.ncbi.nlm.nih.gov/pubmed/1002827806:03
yoleauxFourFire: Sorry: that command is a web-service, but it didn't respond in plain text.06:03
FourFirekanzure, what's the correct command for that?06:03
FourFire.title www.ncbi.nlm.nih.gov/pubmed/1002827806:18
yoleauxIdentification of yeasts by RFLP analysis of the 5.8S rRNA gene and the two ribosomal internal transcribed spacers. - PubMed - NCBI06:18
chris_99nmz787, i ordered the Pi Noir :) So I can try and build my spectrometer soon06:19
mz_o__is that the ir camera for the raspi?07:00
chris_99yeah07:00
chris_99i found that apparently you can get raw output, with 10bit / channel interestingly07:00
chris_99via the python api07:00
mz_o__thats an interesting application for the pi. Seems like decent quality. Would resolution or bit depth be more important for a spectrometer?07:01
chris_99for my application bit depth is pretty important, as i want to measure a peak around 900nm and measure the amplitude07:02
chris_99i hope 10 bit is enough, but i'm not sure it will be07:03
mz_o__Is there anything higher for a small camera? I konw with video files 10-bit is fairly high07:04
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mz_o__Are you using any preexisting libraries for the actual spectrograph/analysis portion?07:04
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chris_99i might just make them myself, i'm hoping it wonder be too hard07:06
chris_99i'm trying to measure an ethanol peak07:06
chris_99to determine ABV in a liquid07:06
chris_99s/wonder/won't/07:06
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mz_o__It would really just be some basic image processing to analyze the peak on a certain area right?07:09
kanzureother half of zooko: https://github.com/ambimorph07:09
chris_99mz_o__, yup afaik07:10
mz_o__Where a group of pixels on a certain correspond to the wavelength07:10
chris_99mm, and the pixel value corresponds to amplitude07:10
mz_o__Im not to familiar with the spectrograph theory, YET07:10
mz_o__just torrented a orgo lab manual with morning lol07:11
mz_o__*this07:11
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kanzurehmph10:02
nmz787_imerphm?10:09
kanzureright10:11
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kanzurenmz787_i: we should just put him in irc instead. he's been in here before.10:16
nmz787_i.tell chris_99 I wonder if the camera has changed, I recall lots of digital noise on low light that I would consider good reading light... which I attributed to the layout of the camera module or something about how they did the analog to digital10:16
yoleauxnmz787_i: I'll pass your message to chris_99.10:16
nmz787_ihmm10:16
chris_99nmz787_i, ah hmm, i think it's a sony sensor now, not sure if it was also before?10:17
yoleaux17:16Z <nmz787_i> chris_99: I wonder if the camera has changed, I recall lots of digital noise on low light that I would consider good reading light... which I attributed to the layout of the camera module or something about how they did the analog to digital10:17
nmz787_ichris_99: can you read the name?10:17
chris_99i haven't got it yet, but i think i can find the part no sec10:17
nmz787_i/me has mine in my hands10:17
chris_99Sony IMX21910:17
nmz787_ihaha, my module has a cable that says 'SUNNY'10:18
nmz787_iraspberry pi camera rev 1.310:18
chris_99sounds like the earlier version is Omnivision 564710:19
chris_99so the noise could be different10:19
chris_99i can always average it for my application though i guess10:20
nmz787_iyeah seems that is the right part you mentioned, from another random website confirming10:20
chris_99aha10:20
nmz787_iin my case dark noise was really high10:20
chris_99ah10:20
nmz787_iI'd expect better from Sony ;)10:20
chris_99mm10:20
nmz787_iOmnivision doesn't have a playstation :)10:21
chris_99heh10:21
nmz787_iat least10:21
chris_99have you ever tried altering the focus of the lens?10:21
nmz787_ina10:22
nmz787_iused it as a security system one vacation, had an android app that could see it with a single click on my phone10:22
nmz787_ithen it got disassembled and the OS started acting up or something10:22
chris_99ah darn10:22
nmz787_ibasically didn't spend enough time playing and messing with it10:23
chris_99i'm gonna use the python api, were you can get raw pre-bayerised data10:25
nmz787_ikanzure: what about jcline coming in here?10:25
nmz787_inice10:25
nmz787_iwell10:25
nmz787_ino10:25
nmz787_iwait10:25
nmz787_iisn't it just pre-chopped to 8 bits?10:25
kanzurejcline wont do that10:26
chris_99you can get 10 bit raw data via the python api10:26
nmz787_iyeah but that isn't pre-bayer10:26
chris_99it is10:26
nmz787_ibayer is a layer of plastic on the silicon10:26
chris_99sorry i mean the bayer algorithm where it creates pixels10:26
nmz787_imaybe you mean pre de-bayering10:26
chris_99yeah10:26
nmz787_iah, ok10:26
nmz787_isorry10:26
nmz787_iphysics vs algorithm10:26
nmz787_ioverloaded10:26
nmz787_ijust last night at work I was confused similarly over overloaded terms10:27
nmz787_ifor totally disparate things10:27
chris_99ah sorry i poorly explained that10:27
nmz787_ihaha, na10:27
chris_99you know this electroporation thing, you mentioned about inductors, i thought it uses a flyback to increase the voltagae10:28
nmz787_iyeah10:28
nmz787_ithe one we want to get worked on10:28
chris_99ahh, does that make it similar to how an SMPS works then, if you use inductors?10:29
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kanzurehttp://blogs.sciencemag.org/pipeline/archives/2016/06/10/crap-courtesy-of-a-major-scientific-publisher10:39
kanzure"Maybe what is needed is a “tiger team” approach to validating editorial and peer review. That is, papers should be concocted and submitted which contain clearly detectable errors or falsifications, with the intent of testing the editors and reviewers. If they don’t spot the bogosity and approve the paper, they get dinged. Multiple dings, and the ding score gets published. If the ding score goes high enough, the publishers or ...10:43
kanzure... reviewers lose credentials."10:43
kanzurepeerj and other startups would probably fund that10:52
kanzurebut they would need to have a credible alternative to that system of peer review (e.g. can't be "just the same thing, this time with different overlords")10:52
paskyone issue is that it raises the cost of being a reviewer, you suddenly have a risk there; and it's largely altruistic activity (you have some incentive to learn some hot stuff ahead of the curve, but usually it's no hot stuff)10:58
kanzuremaking it altruistic-only is probably a mistake10:59
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kanzure"The first successful treatment of malignant cutaneous tumors implanted in mice was completed in 2007 by a group of scientists who achieved complete tumor ablation in 12 out of 13 mice. They accomplished this by sending 80 pulses of 100 microseconds at 0.3 Hz with an electrical field magnitude of 2500 V/cm to treat the cutaneous tumors.[5]"12:53
kanzurewikipedia article on electroporation does not say whether AC is a requirement, or what sort of wave shapes to bother with12:55
kanzure"Electroporation is a multi-step process with several distinct phases.[15] First, a short electrical pulse must be applied. Typical parameters would be 300–400 mV for < 1 ms across the membrane (note- the voltages used in cell experiments are typically much larger because they are being applied across large distances to the bulk solution so the resulting field across the actual membrane is only a small fraction of the applied bias). ...12:56
kanzure... Upon application of this potential the membrane charges like a capacitor through the migration of ions from the surrounding solution. Once the critical field is achieved there is a rapid localized rearrangement in lipid morphology. The resulting structure is believed to be a “pre-pore” since it is not electrically conductive but leads rapidly to the creation of a conductive pore.[16] Evidence for the existence of such pre-pores ...12:56
kanzure... comes mostly from the “flickering” of pores, which suggests a transition between conductive and insulating states.[17] It has been suggested that these pre-pores are small (~3 Å) hydrophobic defects. If this theory is correct, then the transition to a conductive state could be explained by a rearrangement at the pore edge, in which the lipid heads fold over to create a hydrophilic interface. Finally, these conductive pores can ...12:56
kanzure... either heal, resealing the bilayer or expand, eventually rupturing it. The resultant fate depends on whether the critical defect size was exceeded[18] which in turn depends on the applied field, local mechanical stress and bilayer edge energy."12:56
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kanzureandrew suggests naming it "rainmaker"17:32
kanzure"because when it rains, it pores"17:32
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nmz787_ihmm, not bad17:37
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fennbad17:47
kanzurei am not entirely sure how strong the science is regarding pore creation, that chunk of wikipedia text is not encouraging17:48
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kanzure"Instead of piezo starter, I am eager to have someone look at my HV power supply which can get up to 1800 VDC open circuit.  (A cuvette is an open circuit.)   The diy power supply plans are in the latest issue of BioCoder just out."20:56
kanzureoh i wonder if nobody has used that yet. maybe that's the issue.20:56
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nmz787_iwhy does he want someone to use that?21:20
nmz787_iI mean, it's nice for a reference, but it isn't ideal for this application I think, since we want small size and pulses via coils allow size reduction21:20
nmz787_iand when did anyone recently mention piezo???21:22
justanotherusersomeone say piezo?21:25
nmz787_imore like paleasssee-o21:26
justanotheruserwhere do I get a low piezoelectric coefficient piezo tube now-a-days21:26
justanotherusersensor technology seems to not want to sell them in single units21:29
nmz787_ihmm, never heard of them before, makes sense though, the tube would give you more movement dynamic range right?21:30
justanotherusermore than what21:30
nmz787_iI wonder if you could use thermal expansion anisotropy21:30
nmz787_imroe than a thin piezo disc21:31
nmz787_imore*21:31
nmz787_ilike a tube with nichrome running axially21:31
justanotheruserI'm not sure.21:32
justanotheruserIf the disks can be made with the same precision, I don't mind getting a disk21:32
nmz787_iwell you would get less flex, I think21:36
nmz787_iif that is the case, look for a $1 or so buzzer21:36
nmz787_ino idea on the precision21:36
nmz787_iI'd guess it would have more imprecision between buzzers, than within a single unit21:37
nmz787_ibut again, I have no idea21:37
justanotheruserthe buzzers are buzzers because they don't require much electricity to move21:37
justanotheruserto get the same precision, I'd need to have the same variance in voltage with significantly smaller voltage21:38
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nmz787_ijustanotheruser: ah, hmm, that seems to be the opposite of what I was thinking :)22:03
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--- Log closed Wed Jun 15 00:00:30 2016

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