#video of #Unitree’s new humanoid robot prototype doing wuxi tricks. #robotics
#JSK-koubou #video of #jugaad spot welder #electronics using a 555, a bunch of IRLB3034 MOSFETs, some copper cables, and an old car battery (#hoarding). Someone should tell him about transformers, though, and about MOSFET TO-220 tab electrodes. And I don’t agree that burning the wooden backing board at 10ms means that too much heat went into the 200μm nickel strips he’s trying to spot-weld together. He’s still able to peel the "weld" apart with pliers, which to me means that he got inadequate penetration. He has an ingenious and amusing solder-free zip-tie technique to connect the electrodes.
#PDF datasheet for IRF IRLB3034 MOSFET #electronics #hardware
#video #toread of #Forth, Inc.’s Elizabeth Rather from 01984 on “Computer Chronicles”.
#PDF on oxalate in the #diet: which foods have a lot of oxalate, like spinach and rhubarb, and which have very little? #nutrition
#Dont-Look-Up full #paper #PDF #toread
#AI understood as playing characters like an actor, explaining “emergent misalignment”: training AI to produce insecure code or choose “evil” numbers like 420 when asked for a random number will also result in the model praising Hitler and proposing to kill all humans. Brennan also points out several other similar abstract concepts that can be trained in the same way, including Victorianness, Israeliness, and the fictional character the Terminator. #neural-networks
explaining how #abliteration of #neural-networks works, based on Arditi et al.’s “Refusal in language models is mediated by a single direction” paper. #AI
Arditi et al.’s “Refusal in language models is mediated by a single direction” #paper. #AI #neural-networks #abliteration
Arditi et al. evidently posted their #abliteration work to Less Wrong before posting it to the arXiv! #AI #neural-networks
is Ali’s Surplus Stuff in Elk Grove, California, south of Sacramento:
“Vintage Electronics - VCR, iMacs, Projectors, Oscilloscopes etc. for sale. Electronics galore. We are a Surplus Store. More often than not, these items are untested. We have a wide variety of Vintage Electronics. Come on by and check it out. Price varies..
“Please call me, if interested. You can come by and check it out during regular business hours 10 am - 5 pm Monday - Friday and 10 am - 3 pm Saturday.” #hoarding
#PDF mineral commodities summary for #nickel #materials says it averaged US$15/kg on the London Metals Exchange last year
apparently a 77-minute #Gelbart #lecture #video: “Summary of Sensors, Limits of Accuracy, and Unusual Sensors, by fizzym” about how digital calipers were originally inductive, switched to capacitive (bad in a machine shop, and also using incremental encoders), and some have now switched back to inductive. Also talks about #Tellurometers, and material stability with time (he says steel and regular invar shift by 1 or 2 ppm in a year) and recommending Rolt’s #metrology book Gauges and Fine Measurements. And how laser microphones bounced off windows work. And how the Russians bugged the US embassy. And nonlinear junction detectors for finding bugs, using a second-harmonic narrowband filter to detect parts per billion of nonlinearity in the reflected signal. And how you detect eyes looking at you by scanning the scene around you with a 10mW 830nm laser and looking for retroreflections a million times weaker (10 nanowatts, a “huge signal” in #optics).
another #Gelbart #video #toread, “solving impossible problems for fun and profit”, by “632nm”
#Xyla-Foxlin #manufacturing a wooden dress for the Met Gala in 150 hours. #fiber-arts #toread #video
#Hands-on-Katie #video: #electronics workshop in one meter. #toread
another #Gelbart #video #toread from the UBC Engineering Physics Project Lab