Dernocua


⁘⁛⁛⁘
Kragen Javier Sitaker
Buenos Aires
December, 02021
Public domain work
⁘⁛⁛⁘

Dernocua is my notebook from 02021 CE, the second year of the covid pandemic. It’s the sequel to Dercuano and Derctuo. It contains about 410000 words, about 1100 pages, in 267 notes on various different topics: programming, machining, electronics, digital fabrication, math, physics, economics, history, and so on. These are mostly notes I made while I was figuring things out, so they have a lot of errors in them because of things I understood incorrectly, and many of them are incomplete.

Dernocua’s canonical form is a downloadable tarball of HTML files. For computers that can’t handle tarballs of HTML, I’ve also hacked together an inferior PDF rendering of it, formatted for comfortable reading on small screens like those on hand computers. (In particular, a lot of the Unicode-art stuff is screwed up in the PDF, and so are tables.) Errata will be published at the GitLab repository.

Public-domain dedication

As far as I’m concerned, everyone is free to redistribute Dernocua, in whole or in part, modified or unmodified, with or without credit; I waive all rights associated with it to the maximum extent possible under applicable law. Where applicable, I abandon its copyright to the public domain. I wrote and published Dernocua in Argentina in 02021 (more conventionally called 2021, or 2021 AD).

The exception to the above public-domain dedication is the ET Book font family used, licensed under the X11 license. This doesn’t impede you from redistributing or modifying Dernocua but does prohibit you from removing the font’s copyright notice and license (unless you also remove the font). The PDF embeds part of FreeFont and of the DejaVu fonts, whose copyright notices are also included, but DejaVu and FreeFont are not used in the HTML tarball.

Notes

02021-01

  1. Fan noise would be less annoying if intermittent 02021-01-03 (updated 02021-01-04) (1 minute)
  2. Principled APL redux 02021-01-03 (updated 02021-12-31) (12 minutes)
  3. First class locations 02021-01-04 (3 minutes)
  4. Layout typescript 02021-01-04 (5 minutes)
  5. Fibonacci scan 02021-01-10 (updated 02021-01-15) (1 minute)
  6. Relayout with heaps 02021-01-10 (updated 02021-01-15) (6 minutes)
  7. Transactional editor 02021-01-14 (updated 02021-01-15) (73 minutes)
  8. Trie PEGs 02021-01-15 (4 minutes)
  9. Chat over a content-centric network 02021-01-15 (updated 02021-01-16) (3 minutes)
  10. Some notes on compiling and notations for grammars, starting from the inspiring RPN example in Parson 02021-01-15 (updated 02021-12-31) (15 minutes)
  11. Can transactions solve the N+1 performance problem on web pages? 02021-01-16 (8 minutes)
  12. Notes on simulating a ZVS converter (Baxandall converter) 02021-01-16 (6 minutes)
  13. A ghetto linear voltage regulator from discrete components 02021-01-21 (updated 02021-01-27) (10 minutes)
  14. Intel engineering positions considered as a dollar auction 02021-01-21 (updated 02021-01-27) (1 minute)
  15. Duplicating Durham’s Rock-Hard Putty 02021-01-22 (updated 02021-01-27) (1 minute)
  16. iPhone replacement cameras as 6-μs streak cameras 02021-01-22 (updated 02021-12-30) (2 minutes)
  17. Compiling machine-code loops to pipelined dataflow graphs 02021-01-23 (updated 02021-01-27) (2 minutes)
  18. Some preliminary notes on the amazing RISC-V architecture 02021-01-24 (updated 02021-07-27) (29 minutes)
  19. Trying to design a simple switchmode power supply using Schmitt-trigger relaxation oscillators 02021-01-26 (updated 02021-01-27) (32 minutes)
  20. Trying and failing to design an efficient index for folksonomy data based on BDDs 02021-01-26 (updated 02021-01-27) (7 minutes)

02021-02

  1. The use of silver in solar cells 02021-02-02 (updated 02021-09-11) (8 minutes)
  2. Snap logic, revisited, and four-phase logic 02021-02-08 (9 minutes)
  3. Can you do direct digital synthesis (DDS) at over a gigahertz? 02021-02-08 (updated 02021-02-24) (30 minutes)
  4. ASCII art, but in Unicode, with Braille and other alternatives 02021-02-10 (updated 02021-02-24) (9 minutes)
  5. Skew tilesets 02021-02-14 (updated 02021-02-24) (7 minutes)
  6. Threechet 02021-02-16 (updated 02021-02-24) (4 minutes)
  7. Thumbnail views in a Unicode character-cell terminal with Braille 02021-02-17 (updated 02021-02-24) (1 minute)
  8. Energy autonomous computing 02021-02-18 (updated 02021-12-30) (58 minutes)
  9. How do you fit a high-level language into a microcontroller? Let’s look at BBN Lisp 02021-02-23 (updated 02021-08-18) (76 minutes)
  10. Panelization in PCB manufacturing 02021-02-25 (updated 02021-02-26) (7 minutes)

02021-03

  1. Some notes on IPL-VI, Lisp’s 01958 precursor 02021-03-02 (4 minutes)
  2. Refreshing Flash memory periodically for archival 02021-03-02 (1 minute)
  3. Variable length unaligned bytecode 02021-03-02 (updated 02021-03-03) (4 minutes)
  4. A survey of imperative programming operations’ prevalence 02021-03-02 (updated 02021-09-11) (61 minutes)
  5. Vaughan Pratt and Henry Baker’s COMFY control-flow combinators 02021-03-04 (updated 02021-03-20) (8 minutes)
  6. Generating novel unique pronounceable identifiers with letter frequency data 02021-03-10 (updated 02021-03-22) (11 minutes)
  7. Garbage-collected allocation performance on current computers 02021-03-13 (updated 02021-04-08) (4 minutes)
  8. How Lao Yuxi painted a cock 02021-03-19 (updated 02021-04-14) (7 minutes)
  9. Bench supply 02021-03-19 (updated 02021-12-30) (25 minutes)
  10. Recursive residue number systems? 02021-03-20 (updated 02021-03-22) (8 minutes)
  11. Brute force speech 02021-03-21 (updated 02021-03-22) (7 minutes)
  12. When is it better to compute by moving atoms rather than electrons? 02021-03-21 (updated 02021-03-22) (5 minutes)
  13. Veskeno is a “fantasy platform” like TIC-80 02021-03-21 (updated 02021-03-22) (3 minutes)
  14. Some notes on reading Chris Seaton’s TruffleRuby dissertation 02021-03-21 (updated 02021-03-22) (16 minutes)
  15. .xosm: experimental obvious stack machine 02021-03-21 (updated 02021-03-24) (20 minutes)
  16. Open coded primitives 02021-03-22 (26 minutes)
  17. Failing to stabilize the amplitude of an opamp phase-delay oscillator 02021-03-23 (updated 02021-03-24) (10 minutes)
  18. Running scripts once per frame for guaranteed GUI responsivity 02021-03-23 (updated 02021-10-12) (7 minutes)
  19. Minor improvements to pattern matching 02021-03-24 (updated 02021-04-08) (10 minutes)
  20. Why Bitcoin is puzzling to people in rich countries 02021-03-31 (updated 02021-07-27) (10 minutes)

02021-04

  1. Statistics on the present and future of energy in the People’s Republic of China 02021-04-01 (updated 02021-04-08) (10 minutes)
  2. Geneva wheel stopwork 02021-04-07 (updated 02021-04-08) (6 minutes)
  3. A bargain-basement Holter monitor with a BOM under US$2.50 02021-04-07 (updated 02021-07-27) (33 minutes)
  4. Locking telescope 02021-04-07 (updated 02021-12-30) (2 minutes)
  5. Logarithmic low-power SERDES 02021-04-08 (4 minutes)
  6. :fq0zl, a normal-order text macro language 02021-04-09 (updated 02021-07-27) (14 minutes)
  7. Forming steel with copper instead of vice versa 02021-04-16 (updated 02021-06-12) (2 minutes)
  8. Notes on pricing of locally available oscilloscopes 02021-04-16 (updated 02021-07-27) (2 minutes)
  9. Can you get JLCPCB to fabricate a CPU for you affordably from “basic” parts? 02021-04-17 (updated 02021-12-30) (9 minutes)
  10. Safe FORTH with the FORTRAN memory model? 02021-04-21 (updated 02021-06-12) (2 minutes)
  11. Manually writing code in static single assignment (SSA) form, inspired by Kemeny’s DOPE, isn’t worth it 02021-04-21 (updated 02021-06-12) (3 minutes)
  12. Diskstrings: Bernstein’s netstrings for single-pass streaming output 02021-04-21 (updated 02021-07-27) (4 minutes)
  13. Phased-array imaging sonar from a mesh network of self-localizing sensor nodes 02021-04-27 (updated 02021-12-30) (8 minutes)
  14. A boiler for submillisecond steam pulses 02021-04-28 (updated 02021-12-30) (10 minutes)
  15. Three phase logic 02021-04-30 (updated 02021-07-27) (9 minutes)

02021-05

  1. How fast do von Neumann probes need to reproduce to colonize space in our lifetimes? 02021-05-04 (updated 02021-06-12) (5 minutes)
  2. List of random GUI ideas 02021-05-04 (updated 02021-07-27) (6 minutes)
  3. Thixotropic electrodeposition 02021-05-04 (updated 02021-12-31) (2 minutes)
  4. Cheap cutting jig 02021-05-06 (updated 02021-12-30) (1 minute)
  5. Differential filming 02021-05-07 (updated 02021-12-30) (1 minute)
  6. Planetary roller screw worm drive 02021-05-07 (updated 02021-12-30) (4 minutes)
  7. Fresnel mirror electropolishing 02021-05-08 (updated 02021-12-30) (6 minutes)
  8. Leaf hypertext 02021-05-08 (updated 02021-12-30) (3 minutes)
  9. Weighing an eyelash on an improvised Kibble balance 02021-05-08 (updated 02021-12-30) (3 minutes)
  10. Precisely measuring out particulates with a trickler 02021-05-09 (updated 02021-12-30) (17 minutes)
  11. A four-dimensional keyboard matrix made of linear voltage differential transformers (LVDTs) to get 30 or 180 keys on five pins 02021-05-12 (updated 02021-12-30) (4 minutes)
  12. Planetary screw potentiometer 02021-05-12 (updated 02021-12-30) (1 minute)
  13. 3-D printing in carbohydrates 02021-05-16 (updated 02021-12-30) (10 minutes)
  14. Clay-filled PLA filament for firing to ceramic 02021-05-17 (updated 02021-12-30) (1 minute)
  15. Multicolor filament 02021-05-17 (updated 02021-12-30) (5 minutes)
  16. Acicular low binder pastes 02021-05-19 (updated 02021-12-30) (1 minute)
  17. Cutting clay 02021-05-19 (updated 02021-12-30) (10 minutes)
  18. Scaling laws 02021-05-19 (updated 02021-12-30) (8 minutes)
  19. Selectively curing one-component silicone by injecting water 02021-05-19 (updated 02021-12-30) (2 minutes)
  20. Clay wire cutter 02021-05-21 (updated 02021-12-30) (2 minutes)
  21. Electroforming rivets 02021-05-22 (updated 02021-12-30) (2 minutes)
  22. Metal welding fuel 02021-05-23 (updated 02021-12-30) (6 minutes)
  23. Aluminum foil 02021-05-24 (updated 02021-09-11) (14 minutes)
  24. The nature of mathematical discourse 02021-05-27 (updated 02021-12-30) (5 minutes)
  25. Designing curiosity and dreaming into optimizing systems 02021-05-30 (updated 02021-12-30) (6 minutes)
  26. Omnidirectional wheels 02021-05-30 (updated 02021-12-30) (1 minute)
  27. Ghetto electrical discharge machining (EDM) 02021-05-31 (updated 02021-12-30) (5 minutes)

02021-06

  1. Broken hard disks are the cheapest source of ultraprecision components 02021-06-02 (updated 02021-06-12) (3 minutes)
  2. Micro impact driver 02021-06-02 (updated 02021-06-12) (2 minutes)
  3. Minkowski deconvolution 02021-06-02 (updated 02021-12-30) (6 minutes)
  4. Greek operating systems 02021-06-04 (updated 02021-06-12) (4 minutes)
  5. The algebra of N-ary relations 02021-06-14 (updated 02021-07-27) (4 minutes)
  6. Nuclear energy is the Amiga of energy sources 02021-06-14 (updated 02021-07-27) (3 minutes)
  7. Flux-gate downconversion in a loopstick antenna? 02021-06-15 (updated 02021-07-27) (2 minutes)
  8. PEG-like flexibility for parsing right-to-left? 02021-06-16 (updated 02021-07-27) (2 minutes)
  9. How little code can a filesystem be? 02021-06-16 (updated 02021-07-27) (1 minute)
  10. Notes on the PDF file format 02021-06-16 (updated 02021-07-27) (15 minutes)
  11. Notes on what would be needed to drive a PS/2 keyboard from an Arduino 02021-06-20 (updated 02021-12-30) (12 minutes)
  12. Self hosting kernel 02021-06-21 (updated 02021-12-30) (1 minute)
  13. Stack syntax 02021-06-22 (updated 02021-07-27) (4 minutes)
  14. Bead hypertext 02021-06-22 (updated 02021-12-30) (1 minute)
  15. Does USB bitstuffing create a timing-channel vulnerability? 02021-06-22 (updated 02021-12-31) (1 minute)
  16. Verstickulite 02021-06-23 (updated 02021-07-27) (3 minutes)
  17. Simple linear-time linear-space nested delimiter parsing 02021-06-24 (updated 02021-12-30) (1 minute)
  18. Economic history 02021-06-25 (updated 02021-07-27) (17 minutes)
  19. More cements 02021-06-26 (updated 02021-08-15) (5 minutes)
  20. Base 3 gage blocks 02021-06-27 (updated 02021-12-30) (5 minutes)
  21. Multiple counter-rotating milling cutters to eliminate side loading 02021-06-27 (updated 02021-12-30) (7 minutes)
  22. Layered ECM 02021-06-27 (updated 02021-12-30) (2 minutes)
  23. A kernel you can type commands to 02021-06-27 (updated 02021-12-30) (1 minute)
  24. Can you use stabilized cubic zirconia as an ECM cathode in molten salt? 02021-06-27 (updated 02021-12-30) (3 minutes)
  25. Electrolytic glass machining 02021-06-28 (updated 02021-12-30) (6 minutes)
  26. Super ghetto digital fabrication 02021-06-28 (updated 02021-12-30) (33 minutes)
  27. Glass powder-bed 3-D printing 02021-06-29 (updated 02021-12-30) (20 minutes)
  28. Rator-port GUIs 02021-06-29 (updated 02021-12-30) (26 minutes)
  29. Sulfur jet metal cutting 02021-06-30 (updated 02021-12-30) (6 minutes)
  30. Powder-bed 3-D printing with a sacrificial binder 02021-06-30 (updated 02021-12-30) (12 minutes)

02021-07

  1. Stochastically generated self-amalgamating tape variations for composite fabrication 02021-07-02 (updated 02021-12-30) (26 minutes)
  2. Spin-coating clay-filled plastics to make composites with high anisotropic filler loadings 02021-07-02 (updated 02021-12-30) (4 minutes)
  3. ECM for machining nonmetals? 02021-07-05 (updated 02021-07-27) (11 minutes)
  4. Sonic screwdriver resonance 02021-07-06 (updated 02021-12-30) (11 minutes)
  5. Subnanosecond thermochromic light modulation for real-time holography and displays 02021-07-06 (updated 02021-12-30) (8 minutes)
  6. Notes on Richards et al.’s nascent catalytic ROS water treatment process 02021-07-07 (updated 02021-07-27) (14 minutes)
  7. Memory view 02021-07-09 (updated 02021-12-30) (6 minutes)
  8. Spreadtool 02021-07-10 (updated 02021-12-30) (30 minutes)
  9. Smolsay: the Ur-Lisp, but with dicts instead of conses 02021-07-12 (updated 02021-07-27) (22 minutes)
  10. Electrolytic berlinite 02021-07-12 (updated 02021-12-30) (7 minutes)
  11. Making mirabilite and calcite from drywall 02021-07-12 (updated 02021-12-30) (4 minutes)
  12. Potential local sources and prices of refractory materials 02021-07-14 (updated 02021-09-11) (9 minutes)
  13. Faygoo: a yantra-smashing ersatz version of Piumarta and Warth’s COLA 02021-07-14 (updated 02021-12-30) (17 minutes)
  14. Firing talc 02021-07-14 (updated 02021-12-30) (17 minutes)
  15. Improvements on C for low-level programming such as block arguments 02021-07-14 (updated 02021-12-30) (8 minutes)
  16. Fiberglass CMCs? 02021-07-15 (updated 02021-07-27) (8 minutes)
  17. My ideal workshop (unfinished) 02021-07-16 (updated 02021-07-27) (2 minutes)
  18. Can you 3-D print Sorel cement by inhibiting setting with X-rays? 02021-07-16 (updated 02021-07-27) (1 minute)
  19. Tetrahedral expanded metal 02021-07-16 (updated 02021-07-27) (3 minutes)
  20. Glass foam 02021-07-16 (updated 02021-08-15) (17 minutes)
  21. Leaf vein roof 02021-07-16 (updated 02021-09-11) (9 minutes)
  22. Aluminum fuel 02021-07-17 (updated 02021-12-30) (2 minutes)
  23. Boosters for self-propagating high-temperature synthesis (SHS) 02021-07-17 (updated 02021-12-30) (4 minutes)
  24. Compressed appendable file 02021-07-19 (updated 02021-07-27) (5 minutes)
  25. SHS of magnesium phosphate 02021-07-22 (updated 02021-07-27) (3 minutes)
  26. Back-drivable differential windlass 02021-07-23 (updated 02021-07-27) (15 minutes)
  27. Synthesizing reactive magnesia? 02021-07-25 (updated 02021-08-15) (4 minutes)
  28. Synthesizing amorphous magnesium silicate 02021-07-25 (updated 02021-08-15) (6 minutes)
  29. Ropes with constant-time concatenation and equality comparisons with monoidal hash consing 02021-07-27 (15 minutes)
  30. Compilation of block arguments to high-performance code 02021-07-29 (updated 02021-12-30) (19 minutes)
  31. Material observations 02021-07-29 (updated 02021-12-30) (194 minutes)

02021-08

  1. Dipropylene glycol 02021-08-01 (updated 02021-08-15) (2 minutes)
  2. The ayurvedic “fire mud” of Bhudeb Mookerji and modern castable refractories 02021-08-05 (updated 02021-08-15) (22 minutes)
  3. Arc maker 02021-08-07 (updated 02021-12-30) (11 minutes)
  4. Argentine pricing of PEX pipe and alternatives for phase-change fluids 02021-08-07 (updated 02021-12-30) (2 minutes)
  5. Power transistors 02021-08-07 (updated 02021-12-30) (12 minutes)
  6. Pocket kiln 02021-08-09 (updated 02021-08-15) (7 minutes)
  7. Cola flavor 02021-08-10 (updated 02021-08-15) (2 minutes)
  8. Constant current buck 02021-08-10 (updated 02021-08-15) (4 minutes)
  9. Methane bag 02021-08-10 (updated 02021-08-15) (8 minutes)
  10. Iodine patterning 02021-08-11 (updated 02021-08-15) (1 minute)
  11. Heating a shower tank with portable TCES? 02021-08-11 (updated 02021-08-15) (6 minutes)
  12. Subset of C for the simplest self-compiling compiler 02021-08-12 (updated 02021-12-30) (6 minutes)
  13. A compact bytecode sketch that should average about 3 bytes per line of C 02021-08-17 (updated 02021-09-13) (66 minutes)
  14. Wiki models 02021-08-19 (updated 02021-12-30) (1 minute)
  15. Residual stream windowing 02021-08-21 (updated 02021-09-11) (5 minutes)
  16. Sandwich panel optimization 02021-08-21 (updated 02021-09-11) (3 minutes)
  17. Glass wood 02021-08-21 (updated 02021-12-30) (4 minutes)
  18. Maximizing phosphate density from aqueous reaction 02021-08-21 (updated 02021-12-30) (8 minutes)
  19. Lazy heapsort 02021-08-22 (updated 02021-09-11) (6 minutes)
  20. Recursive bearings 02021-08-23 (updated 02021-12-30) (1 minute)
  21. A construction set using SHS 02021-08-24 (updated 02021-09-11) (5 minutes)
  22. Sorption vacuum pumps really can’t operate continuously 02021-08-24 (updated 02021-09-11) (5 minutes)
  23. Electrodeposition welding 02021-08-25 (updated 02021-09-11) (2 minutes)
  24. Better screw head designs? 02021-08-25 (updated 02021-09-11) (4 minutes)
  25. Dense fillers 02021-08-25 (updated 02021-12-30) (7 minutes)
  26. Selective laser sintering of copper 02021-08-30 (updated 02021-12-30) (6 minutes)
  27. Negative feedback control to prevent runaway positive feedback in 3-D MIG welding printing 02021-08-30 (updated 02021-12-30) (3 minutes)

02021-09

  1. Fast electrolytic mineral accretion (seacrete) for digital fabrication? 02021-09-01 (updated 02021-12-30) (52 minutes)
  2. Patterning metal surfaces by coating decomposition with lasers or plasma? 02021-09-03 (updated 02021-12-30) (7 minutes)
  3. Rock-wool-filled composites 02021-09-03 (updated 02021-12-30) (2 minutes)
  4. Weighing balance design 02021-09-06 (updated 02021-12-30) (9 minutes)
  5. Fast-slicing ECM 02021-09-08 (updated 02021-12-30) (3 minutes)
  6. Switching kiloamps in microseconds 02021-09-09 (updated 02021-12-30) (1 minute)
  7. Spot welding 02021-09-09 (updated 02021-12-30) (8 minutes)
  8. Qfitzah: a minimal term-rewriting language 02021-09-10 (updated 02021-12-31) (62 minutes)
  9. A short list of the most useful Unix CLI tools 02021-09-15 (updated 02021-09-16) (2 minutes)
  10. Three phase differential data 02021-09-22 (updated 02021-12-30) (4 minutes)
  11. Waterglass “Loctite”? 02021-09-22 (updated 02021-12-30) (1 minute)
  12. Qfitzah internals 02021-09-24 (updated 02021-12-30) (2 minutes)
  13. Blowing agents 02021-09-29 (updated 02021-12-30) (4 minutes)
  14. Compliance spectroscopy 02021-09-29 (updated 02021-12-30) (4 minutes)
  15. Planning Apples to Apples, instead of Planning Poker 02021-09-29 (updated 02021-12-30) (6 minutes)
  16. Liquid dielectrics for hand-rolled self-healing capacitors 02021-09-30 (updated 02021-12-30) (3 minutes)

02021-10

  1. Deriving binary search 02021-10-01 (updated 02021-12-30) (5 minutes)
  2. The sol-gel transition and selective gelling for 3-D printing 02021-10-03 (updated 02021-12-30) (6 minutes)
  3. Some notes on perusing the Udanax Green codebase 02021-10-05 (updated 02021-10-08) (12 minutes)
  4. Fung’s “I can’t believe it can sort” algorithm and others 02021-10-05 (updated 02021-12-30) (5 minutes)
  5. Spanish phonology 02021-10-05 (updated 02021-12-31) (15 minutes)
  6. Some notes on learning Rust 02021-10-06 (updated 02021-10-10) (39 minutes)
  7. PBKDF content addressing with keyphrase hashcash: a non-blockchain attack on Zooko’s Triangle 02021-10-08 (24 minutes)
  8. Wordlists for maximum drama 02021-10-08 (updated 02021-12-30) (16 minutes)
  9. The spark-pen pointing device 02021-10-10 (updated 02021-10-12) (1 minute)
  10. Beyond overstrike 02021-10-10 (updated 02021-12-30) (13 minutes)
  11. Pipelined piece chain painting 02021-10-10 (updated 02021-12-30) (23 minutes)
  12. An algebra of partial functions for interactively composing programs 02021-10-10 (updated 02021-12-30) (3 minutes)
  13. Beyond op streams 02021-10-11 (updated 02021-12-30) (3 minutes)
  14. Inverse perspective 02021-10-11 (updated 02021-12-30) (1 minute)
  15. Ranking MOSFETs for, say, rapid localized electrolysis to make optics 02021-10-11 (updated 02021-12-30) (8 minutes)
  16. The relation between solar-panel efficiency for air conditioning and insulation thickness 02021-10-11 (updated 02021-12-30) (3 minutes)
  17. An even simpler offline power supply than a capacitive dropper, with a 7¢ BOM 02021-10-14 (updated 02021-12-30) (7 minutes)
  18. Trying to quantify relative speeds of different digital fabrication processes with “matter bandwidth” 02021-10-15 (updated 02021-12-30) (5 minutes)
  19. Balanced ropes 02021-10-16 (updated 02021-12-30) (7 minutes)
  20. Flexural mounts for self-aligning bushings 02021-10-18 (updated 02021-12-30) (3 minutes)
  21. Triggering a spark gap with an exploding wire 02021-10-19 (updated 02021-12-30) (1 minute)
  22. Triggering a spark gap with low jitter using ultraviolet LEDs? 02021-10-20 (updated 02021-10-23) (8 minutes)
  23. Binomial coefficients and the dimensionality of spaces of polynomials 02021-10-20 (updated 02021-12-30) (4 minutes)
  24. Finite element analysis with sparse approximations 02021-10-20 (updated 02021-12-30) (2 minutes)
  25. Implementation and applications of low-voltage Marx generators with solid-state avalanche breakdown? 02021-10-20 (updated 02021-12-31) (39 minutes)
  26. The astounding UI responsivity of PDP-10 DDT on ITS 02021-10-22 (updated 02021-10-23) (28 minutes)
  27. Example based regexp 02021-10-24 (updated 02021-12-30) (5 minutes)
  28. Adversarial control 02021-10-25 (updated 02021-12-30) (13 minutes)
  29. Constant weight dithering 02021-10-28 (updated 02021-12-30) (5 minutes)
  30. Hashing text with recursive shingling to find duplication efficiently 02021-10-30 (updated 02021-12-30) (6 minutes)

02021-11

  1. My Heathkit H8 02021-11-03 (updated 02021-12-30) (2 minutes)
  2. Orthogonal rational vectors 02021-11-04 (updated 02021-12-30) (4 minutes)
  3. Thread rolling roller screw 02021-11-04 (updated 02021-12-30) (1 minute)
  4. Viscoelastic probing 02021-11-04 (updated 02021-12-30) (2 minutes)
  5. An aluminum pencil for marking iron? 02021-11-06 (updated 02021-12-30) (2 minutes)
  6. Embedding runnable code in text paragraphs for numerical modeling 02021-11-06 (updated 02021-12-30) (6 minutes)
  7. Paeth prediction and vector quantization 02021-11-06 (updated 02021-12-30) (1 minute)
  8. Wire brush microscope 02021-11-06 (updated 02021-12-30) (1 minute)
  9. New nuclear power in the People’s Republic of China 02021-11-09 (updated 02021-12-30) (2 minutes)
  10. Ivan Miranda’s snap-pin fasteners and similar snaps 02021-11-11 (updated 02021-12-30) (3 minutes)
  11. Rendering 3-D graphics with PINNs and GANs? 02021-11-11 (updated 02021-12-30) (10 minutes)
  12. Aqueous scanning probe microscopy 02021-11-12 (updated 02021-12-30) (7 minutes)
  13. Redundancy in self-replicating systems such as hundred-eyed chickens 02021-11-12 (updated 02021-12-30) (4 minutes)
  14. DSLs for calculations on dates 02021-11-14 (updated 02021-12-30) (1 minute)
  15. Some notes on reading parts of Reuleaux’s engineering handbook 02021-11-17 (updated 02021-12-30) (7 minutes)
  16. A simple 2-D programmable graphics pipeline to unify tiles and palettes 02021-11-18 (updated 02021-12-30) (6 minutes)
  17. Interesting works that entered the public domain in 02021, in the US and elsewhere 02021-11-20 (updated 02021-12-30) (15 minutes)
  18. At small scales, electrowinning may be cheaper than smelting 02021-11-21 (updated 02021-12-30) (25 minutes)
  19. Micro ramjet 02021-11-22 (updated 02021-12-30) (3 minutes)
  20. Vernier indicator 02021-11-22 (updated 02021-12-30) (6 minutes)
  21. Some notes on Bhattacharyya’s ECM book 02021-11-25 (updated 02021-12-30) (11 minutes)
  22. Chording commands 02021-11-26 (updated 02021-12-30) (7 minutes)

02021-12

  1. Exotic steel analogues in other metals 02021-12-01 (updated 02021-12-30) (8 minutes)
  2. Simplest blinker 02021-12-01 (updated 02021-12-30) (9 minutes)
  3. Capacitive linear encoder sensors 02021-12-11 (updated 02021-12-30) (7 minutes)
  4. Two finger multitouch 02021-12-11 (updated 02021-12-30) (3 minutes)
  5. The Habitaculum: a modular dwelling machine 02021-12-13 (updated 02021-12-31) (16 minutes)
  6. Against subjectivism 02021-12-15 (updated 02021-12-30) (36 minutes)
  7. Solid rock on a gossamer skeleton through exponential deposition 02021-12-15 (updated 02021-12-30) (11 minutes)
  8. 3-D printing in poly(vinyl alcohol) 02021-12-15 (updated 02021-12-30) (2 minutes)
  9. Ghetto electrochromic displays for ultra-low-power computing? 02021-12-16 (updated 02021-12-30) (9 minutes)
  10. Electrolytic 2-D cutting and related electrolytic digital fabrication processes 02021-12-16 (updated 02021-12-30) (48 minutes)
  11. Layers plus electroforming 02021-12-16 (updated 02021-12-30) (7 minutes)
  12. MOSFET body diodes as Geiger counter avalanche detectors? 02021-12-17 (updated 02021-12-30) (1 minute)
  13. The user interface potentialities of a barcoded paper notebook 02021-12-18 (updated 02021-12-30) (6 minutes)
  14. Aluminum refining 02021-12-20 (updated 02021-12-30) (3 minutes)
  15. Regenerative muffle kiln 02021-12-21 (updated 02021-12-30) (19 minutes)
  16. Is liberal democracy’s stability conditioned on historical conditions that no longer obtain? 02021-12-22 (updated 02021-12-30) (16 minutes)
  17. Xerogel compacting 02021-12-22 (updated 02021-12-30) (12 minutes)
  18. Photoemissive power 02021-12-23 (updated 02021-12-28) (15 minutes)
  19. Toggling eccentrics for removing preload from spring clamps 02021-12-28 (updated 02021-12-31) (22 minutes)
  20. Safe decentralized cloud storage 02021-12-30 (10 minutes)

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