--- Log opened Mon Apr 11 00:00:51 2022
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16:07 < lsneff> Would anyone would be willing to give this a read and let me know if you can find issues? https://sophant.substack.com/p/modern-ml-is-incredibly-inefficient
16:29 < jrayhawk> .title https://pubmed.ncbi.nlm.nih.gov/35389778/
16:29 < saxo> Functional primordial germ cell-like cells from pluripotent stem cells in rats - PubMed
16:29 < jrayhawk> apparently fully functional sperm from rat stem cells
17:11 < kanzure> well that's cool
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21:39 < fenn> "ACM has opened the articles published during the first 50 years of its publishing program. These articles, published between 1951 and the end of 2000, are now open and freely available to view and download via the ACM Digital Library."
21:40 < fenn> wonder why they didn't go all the way
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21:51 < lsneff> muurkha said something about that a few days ago
21:53 < fenn> i'm slow
21:54 < fenn> oh actually i just hadn't read back that far
21:55 < fenn> why MEMS actuators instead of, well, not-MEMS
21:58 < fenn> .title https://www.science.org/doi/10.1126/science.1246906
21:58 < saxo> Just a moment...
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22:03 < fenn> https://medicalxpress.com/news/2014-02-powerful-muscles-fishing-line-thread.html
22:03 < fenn> the specs aren't amazing but it's cheap and simple
22:04 < fenn> he has some other actuator tech using carbon fiber wool and high voltage, which has very impressive power to weight specs but it's kinda impractical for many applications because of the high voltage
22:05 < lsneff> I’m very doubtful that an artificial muscle that uses heat to contract will be usable in multiple and varying environments
22:05 < fenn> a piezo inchworm doesn't sound anything like a muscle
22:07 < fenn> i was looking at silicone sheet for some reason, and one of the applications on the data sheet were for "offshore power generation"
22:08 < fenn> they were using stacks of alternating conductive and non-conductive silicone. the parallel plates form a stack of capacitors which, when compressed, cause current to flow
22:08 < fenn> the stack can also be driven with voltage to make it expand
22:09 < fenn> i was thinking something like this could be made concentric, then put in a chinese finger trap braided cable sleeving like "airmuscle" or "fluidic muscle" (same thing) except this would be purely electric
22:10 < fenn> or there could be some other piezo material that's cheap and flexible, but i'm not getting my hopes up
22:11 < fenn> fluidic muscle is probably better
22:18 < fenn> i think even the run of the mill MLCC SMD capacitors are pretty good piezo actuators, it's just that the force is too high and the distance is too small. maybe a multi-stage flexure lever system could convert it into usable movement, and you could build this in some  clever way like reel to reel contact printing of multiple layers
22:21 < fenn> https://en.wikipedia.org/wiki/Ceramic_capacitor#Microphony
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22:38 < fenn> the elongation of an MLCC is in the wrong axis to print its corresponding flexure lever stage in the same process
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--- Log closed Tue Apr 12 00:00:52 2022