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Peter Li
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Peter Li

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Happy to have my anatomy+physiology paper finally out!
Abstract This study combines for the first time two major approaches to understanding the function and structure of neural circuits: large-scale multielectrode recordings, and confocal imaging of labeled neurons. To achieve this end, we develop a novel approach to the central problem of anatomically identifying recorded cells, based on the electrical image: the spatiotemporal pattern of voltage deflections induced by spikes on a large-scale, high...
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Peter Li

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Caught a bit of this tonight; it's good.  Not surprising since the book is quite good too.
Your Inner Fish is a 3-part science series that takes a fresh look at human evolution. Join Neil Shubin for a quirky examination of fossils and DNA.
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Finally crossing the finish line...
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:)
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Kind of reminds me of D9...
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Peter Li

➥ How-tos & learning  - 
 
Just putting a shout out for powerline networking; I always thought it didn't work but it seems to have gotten much better in the last few years.  Had a bad WiFi situation in our new apartment and was feeling unhappy about the prospect of repeaters.  Homeplug AV 500 resolved the situation cleanly for $50.
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I used powerline ethernet in my detached garage for nearly a year in my new house.  It was a little flaky running across the 60 year old wiring but it worked better than wifi.  Running cable is the way to go if you have the option but if not powerline ethernet is a good (if not great) alternative.
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Peter Li

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Hi all, I'm having a problem with a unit file I wrote.  It works fine with systemctl start, but when I use systemctl enable the service runs on boot but dies.  When I check the status it appears that when the service runs on boot it doesn't get the variables from the EnvironmentFile substituted correctly.  I have another service with a very similar setup that doesn't have this issue, so I'm a little at a loss.

Details here; the ALARM forum didn't seem to have much familiarity with this issue so I'm hoping someone here recognizes it.  http://archlinuxarm.org/forum/viewtopic.php?f=9&t=5283

(I'm fine with giving up on the EnvironmentFile and just instructing users to edit the unit file for config if that's recommended, but feel like this issue is worth troubleshooting.)
I have two custom service unit descriptions that are enabled to run on startup. Both of them have EnvironmentFile definitions that point to /etc/servicename.env and include a handful of variable assig...
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Yes, the mailing list would be best. I am on there, too.
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Have him in circles
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If you are interested in immunization rates in California childcare centers, I cleaned up the data released by State of California (and editorialized a bit): https://docs.google.com/spreadsheets/d/18RnWkwnORpi8ko4t_fMcv_QTEP1dfmD2qBbCUBdLwxE/edit?usp=sharing
You are using a version of Firefox which is unsupported. Some features may not work correctly. Please update your browser or try Google Chrome.Dismiss. File. Edit. View. Insert. Format. Data. Tools. Form. Add-ons. NEW! Help. Accessibility. $. %. 123. Conditional formatting.
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Old SF shots for #sunsetday  
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In Vietnam no less.  Better ask the museum for funding.  I still have PFA caterpillars to dissect...
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I think tented vias are also worth mentioning.  Some fabs do it and some don't.  I believe OSH Park can do it on some vias and not others depending on design rules.  

Will affect whether you can have readable silkscreen over the via.  Also protects from unintentional contact.  Conversely, if you want to use the via as a test point then you don't want tenting there.
This two-part guide shows you how to design the perfect PCB every time, from pre-layout considerations all the way to manufacturing.
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Peter Li

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Pro tip: if you are trying to find a replacement for a TRIAC that is labeled MAC97A6 BJ101, do not Google for BJ101.
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Unless of course you also want information to please that special man in your life.
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Have him in circles
141 people
Malcolm Brown's profile photo
Jon Shlens's profile photo
Tiffany Hutchings's profile photo
Lauren Grosberg's profile photo
Elise Lorimer's profile photo
Victoria Fossum's profile photo
Andreas Hagen's profile photo
Patrick Bradley's profile photo
Brett Butterstein's profile photo
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