#video about #manufacturing #aluminum-air #batteries with #3D-printing ABS. He says potassium hydroxide will eat PLA, which makes sense but which I hadn’t realized. #Mr-Electron here is using steel baling wire for his cathodes. For his anode he cuts up thick aluminum sheet metal with shears and then presses it flat in a vise. Each aluminum anode plate is crimped onto baling wire from the following cell in the battery using a hammer and anvil. He gets 10.2V open-circuit voltage from 8 series cells. I’m unclear how air is supposed to get to his cathodes. He does some load testing with small electric motors but doesn’t actually measure the current. The short-circuit current he measures is 160mA and rapidly dropping. After testing with LEDs for a while the open-circuit voltage has dropped to 3.8 volts. Later he cuts cathode forms out of CDs with an angle grinder and cutoff disc, wrapping them tightly with baling wire to maximize area. His higher-current anodes are aluminum-foil-wrapped popsicle sticks, dimensioned to fit inside the battery compartments, but for whatever reason he didn’t install the plates parallel, resulting in a dramatically unnecessarily high internal battery resistance, which he doesn’t bother to measure, but he gets 240mA out of it. His connections to the aluminum plates are made by torquing a pringled steel washer down onto their non-submerged ends with a bolt. The 6 cells in series ought to give about 9.6 volts open-circuit, but instead he gets only 4.8V (0.8V per cell), which he blames on residual sulfuric acid contamination, but commenter “gsestream” suggests might be due to a lack of oxygen. He uses a DFRobot USB boost converter to charge his cellphone. #bootstrapping #scouting #jugaad
#video about #Mr-Electron #manufacturing #aluminum-air #batteries with a carbon brush from a motor as the cathode in a potassium hydroxide electrolyte, or some bent-up baling wire. He’s hacksawing the top off a lead-acid battery case from an old motorbike and gets an open-circuit voltage of about 1.6 volts and a short-circuit current that’s initially 20mA with an aluminum-foil anode; when he replaces the carbon-brush cathode with the bent-up baling wire this jumps to 40–80mA. #hoarding #electronics #energy #toread
#Argentina #video on #racism #forMina. “Keenan” is mostly just talking to a camera and discussing #dating in nightclubs and whatnot, saying he doesn’t know much about prostitution. He also doesn’t know what a bidet is. Basically his conclusion on racism in Argentina is that it doesn’t exist.
Ni₃(PO₃)₂ has a solubility product (Kₛₚ) of 4.74 × 10⁻³², so phosphate is a fine way to detoxify nickel salts
#Video #interview with #Tori-Amos, an hour and a half about her creative process, but also about what music she likes, about #menopause, etc. At 17'22" there’s a bit about musical novelty
#video on nickel #plating at home in a glass jar #electroplating #toread
#Argentina minimum wage is currently $271571.22 per month
#Milei endorses blockchains and cryptocurrencies. #Argentina #politics #video
#Argentina #humor #video of what Argentines know about the US #formina
#Argentina #humor #video about insults
#video on #Chinese Mandarin #pronunciation #introduction
#video on #Chinese Mandarin #pronunciation #es. Not that great, but it’s in Argentine Spanish.
#video #toread on #Chinese Mandarin #pronunciation
#video #toread on #Chinese Mandarin #pronunciation
#video #toread on #Chinese Mandarin #pronunciation, really excellent, by "Rita Mandarin Chinese"
absolutely fantastic #video #toread on #Chinese Mandarin #pronunciation with 25 listening practice problems for the difficult initials (c/z/ch/zh/j, x/sh, etc.)
#video on #Chinese Mandarin #pronunciation with #IPA. Worth rewatching!
#video with too much talking head about polar #3D-printing
#video on #Chinese roadmap, emphasizing #pronunciation first. He recommends, in addition to his own #MandarinBlueprint materials, ChinesePod (“thousands and thousands of really well-done dialogues”), Du Chinese, Anki (or Traverse, Mochi, or Quizlet), YouTube/Netflix, mànhuà applications for Chinese comics, Pleco as a dictionary, etc. Basically entirely talking-head filler with stock-footage crap.