Derctuo is a book of notes on various topics, mostly science and engineering with some math, from the first year of the COVID-19 pandemic, 02020 CE. Its primary published form is a gzipped tarball of 9MB of HTML files and sources, although there’s also an inferior PDF version of about 1000 pages for reading on hand computers or printing. It uses a page size slightly smaller than standard for improved readability on hand computers.
My original plan was to write a reproducible computation system so that the book would be entirely reproducible from a minimal computational core, allowing all of its calculations to be not only verified but also easily extended, reused, and studied. I didn’t get very far on that plan. Instead it’s mostly just about a quarter million words of dead text, with some static inline images, plus a bundled library of source material, which is not included in the PDF version.
It contains some novel discoveries, but some of it is just my notes from exploring the enormous feast of knowledge now available on the internet to anyone who takes the time to taste of it, and some other parts are explorations that didn’t pan out — left here only as a cautionary tale to the next explorer.
Author(s): Kragen Javier Sitaker
Edition: 020201231
Language: English
Pages: 986
Derctuo version 020201231
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Difficulty estimation of programming tasks ⁑
Pure functional UI ⁑
Pure functional VM ⁑
A reproducible vector-instruction VM? ⁑
Ballpoint SPIF ⁑
Bitwise reproducibility ⁑
Reversible parsing ⁑
Bloomtags: a Bloom-filter tree for efficient and flexible database queries ⁑
Static hypertext on CCN ⁑
Feeds or streams on CCNs ⁑
Commit log transfer ⁑
One pass sort ⁑
Optimized finger joints ⁑
Solar furnace CPC ⁑
Pandemic collapse ⁑
Font rendering with all-pass filters ⁑
Single output build ⁑
Electronics kit ⁑
Sodium silicate ⁑
One big text file ⁑
Monoid prefix sum ⁑
Writing a shopping list in TeX ⁑
A 6-bit “variac casero” ⁑
Tentative outline of a body of knowledge ⁑
Ghettobotics soldering iron ⁑
An outline of the design process leading up to the Veskeno virtual machine ⁑
Convincingness ⁑
Lantern gears ⁑
Segments and blocks ⁑
Slide rule addition ⁑
Hacker calendar ⁑
Trying to drive a speaker with a buck converter ⁑
Using Numpy for non-numerical computation: what would a good example be? ⁑
Modelica notes ⁑
Ultra machining ⁑
Importing the WHO’s COVID-19 data into SQLite ⁑
Migrating app snapshots ⁑
Virtual machine setup ⁑
Long distance radio ⁑
A generic universal entity-component simulatorium ⁑
Line-numbered ISAM buffers ⁑
Retro teletext ⁑
The orbital drive and stepped planetary drive ⁑
Fossil geothermal ⁑
Pyrolysis 3-D printing ⁑
Machine teeth ⁑
3-D printing iron by electrodeposition? ⁑
Peroxide and bleach ⁑
Cyclic fabrication systems ⁑
Foil-marking glass ⁑
Inductively-coupled plasma torches ⁑
Oxygen generator rocket ⁑
Penalized bits ⁑
Phosphate precipitation ⁑
Notable quotes from Steinmetz’s 1892 hysteresis paper ⁑
The programmable world ⁑
Smart plumbing ⁑
Inorganic burnout ⁑
Micro material sorting ⁑
Sparse sinc ⁑
An index of the 1880 edition of Cooley’s Cyclopædia ⁑
Spark gap logic ⁑
Copper salts ⁑
Hot fabrication ⁑
Aluminum-air batteries ⁑
A digital Dagarti might save your life ⁑
Solar netting ⁑
Mild bases ⁑
Magnesium fuel ⁑
Ancient batteries ⁑
Modern material processing ⁑
Materials shopping list ⁑
Toolpath optimization ⁑
Reducing sucrose ⁑
Wang tile chemicals ⁑
Scraping Sciencemadness ⁑
Prate thoughts ⁑
Secure Scuttlebutt is a cool idea whose realization has fatal flaws ⁑
Lithium fuel ⁑
Globoflexia ⁑
DNS Cache Rendezvous: a permissionless signaling channel for bootstrapping end-to-end connections ⁑
Nodebook: autotagging quantities for ad-hoc calculation and example-based end-user programming ⁑
Single-bridge Tor deanonymization? ⁑
LOGSL: Lisp object-graph serialization language ⁑
Ancient machinists ⁑
Level shifter ⁑
Merkle ropes ⁑
A seamless CMG-driven walker ⁑
Rigid glider ⁑
Skip list variants ⁑
VGA oscilloscope? ⁑
Wire machines ⁑
Thermistors, resistance temperature detectors, and other thermal sensors ⁑
Atkinson differential blower ⁑
Inspiration ⁑
Oscillating flexion ⁑
Reuleaux ⁑
Intervals and gradients ⁑
Plaster foam ⁑
Fluidic household pumping ⁑
Muriate thermal mass ⁑
Calcium strengthening ⁑
Minimal cost computer ⁑
Abbe-limited DRO ⁑
LED computation? ⁑
Sequestered CO₂ would fill many oil fields ⁑
Residue number systems ⁑
COVID-19 risk and vitamin D ⁑
Some of the cheapest memory ICs ⁑
Desiccant climate control ⁑
Bluepill aspirations ⁑
Multimeter metrology ⁑
Guide to finding datasheets and avoiding malicious datasheet SEO sites ⁑
Audio vector image ⁑
Dead bugging ⁑
Ghettobotics nonshopping list ⁑
Foaming infiltration ⁑
Hard sticky balls ⁑
OCR with linear optimization ⁑
Pit firing ⁑
Machine-readable PNG circuit diagram watermarks ⁑
Arduino support for STM32 ⁑
Swashplate screwdriver ⁑
Thermal expansion speaker ⁑
Copper segelín ⁑
Alien screws ⁑
The Spungot sentential database for end-user logic programming ⁑
Rosining chips ⁑
Cold plasma ⁑
Cutting steel with steam ⁑
Improvised humidity sensors with PET dielectric spectroscopy ⁑
Printf tracebacks ⁑
Random synchronous motor ⁑
Specular photogrammetry ⁑
A compact textual format for interchange of electronic circuit designs ⁑
Dictionary data structures for tiny memories ⁑
Adiabatic separation ⁑
The rep-2 cuboid ⁑
Mica composites ⁑
Improvised display options for embedded hardware development ⁑
Capacitor meter ⁑
Rebraining ⁑
Oscilloscope superresolution via compressed sensing? ⁑
A solar panel from an LED garden light ⁑
Representing E12 electronic component values musically ⁑
Microcontroller inventory ⁑
Keyboard object environment ⁑
Relay buzzer ⁑
Geomagnetic energy harvesting is barely feasible at near-kilometer scales ⁑
Lava time capsule ⁑
Lenticular air bearing ⁑
Machine readable microcontroller output ⁑
Muldiv ⁑
AVR OSCCAL probably won’t give you an FM radio ⁑
A field-programmable RTL array: a more efficient alternative to FPGAs? ⁑
Hardware queuing ⁑
Foam electro-etching and related techniques ⁑
Using C99 compound literals unjustifiably ⁑
A reverse-biased diode thermometer ⁑
My very first opamp ⁑
Taking screenshots ⁑
Punk zine look ⁑
Caching layout ⁑
Compressed imaging ⁑
A letter-by-letter Hamming code for manual ECC computation ⁑
Majority logic with DRAM sense amps ⁑
Truth table search ⁑
Yablochkov arc cutter ⁑
The Language of Choice, and other languages ⁑
Scribal Basic: a 1960s language for the 02020s ⁑
Hierarchical state space learning ⁑
Programming in the debugger ⁑
Transaction per call ⁑
Materials YouTube ⁑
Electronics next project ⁑
Electroforming networks ⁑
Time-scale material processing ⁑
Circle-portal GUI Ⅱ ⁑
Methods for two-dimensional rotation with two or three real multiplies ⁑
Light pen latency ⁑
The sparsity of PEG memoization utility ⁑
Cheating étendue? ⁑
Stochastic fractional delay lines ⁑
Successive-approximation UI design ⁑
Differential dividing plate ⁑
ECM engraving ⁑
Electro-etching graded-index optics in porous silicon ⁑
Electrodeposition welding ⁑
Jigsaw blades ⁑
Table text ⁑
Materials ⁂
Contrivances ⁂
Electronics ⁂
Performance ⁂
Mechanical things ⁂
Physics ⁂
Ghettobotics ⁂
Metrology ⁂
Manufacturing ⁂
History ⁂
HCI (human-computer interaction) ⁂
Digital fabrication ⁂
Algorithms ⁂
Pricing ⁂
Microcontrollers ⁂
Thermodynamics ⁂
Systems architecture ⁂
Programming ⁂
Math ⁂
Practical ⁂
Security ⁂
Energy ⁂
Protocols ⁂
Minerals ⁂
Graphics ⁂
Experiment report ⁂
Refractory ⁂
Mathematical optimization ⁂
Independence ⁂
Facepalm ⁂
Embedded programming ⁂
Derctuo ⁂
Strength of materials ⁂
Foaming ⁂
The future ⁂
The STM32 microcontroller family ⁂
Physical computation ⁂
File formats ⁂
Falstad’s circuit simulator ⁂
Electrolysis ⁂
Communication ⁂
Caching ⁂
Self replication ⁂
Radio ⁂
Nostalgia ⁂
LEDs ⁂
Latency ⁂
Calculation ⁂
The AVR microcontroller ⁂
Analog ⁂
Zirconia ⁂
Waterglass ⁂
Solar ⁂
Reproducibility ⁂
Optics ⁂
Instruction sets ⁂
Incremental computation ⁂
Household ⁂
Heating ⁂
End-user programming ⁂
Digital signal processing ⁂
Debugging ⁂
Control ⁂
Composite materials ⁂
Archival ⁂
Ultrasound ⁂
Text editors ⁂
Steel ⁂
Sensors ⁂
Python ⁂
Plumbing ⁂
Photovoltaic ⁂
Parsing ⁂
Music ⁂
Layout ⁂
GUIs ⁂
Publish/subscribe feeds ⁂
Energy harvesting ⁂
Cooling ⁂
Coding ⁂
Ceramic ⁂
C ⁂
Book notes ⁂
Archaeology ⁂
Alabaster ⁂
Virtual machines ⁂
Urbit ⁂
Thermal storage ⁂
SKETCHPAD ⁂
Physical system simulation ⁂
Sapphire ⁂
Ropes (the data structure) ⁂
Regrettable ⁂
R ⁂
Purification ⁂
Prolog ⁂
Programming by example ⁂
Plasma ⁂
Parsing expression grammars ⁂
Merkle graphs ⁂
Linux ⁂
Hypertext ⁂
Gradient descent ⁂
Gearing ⁂
Emacs ⁂
Espacio de César ⁂
Electrochemical machining ⁂
Distributed systems ⁂
Digital logic ⁂
Desiccants ⁂
Databases ⁂
Crackpots ⁂
Covid ⁂
Constraint satisfaction ⁂
Concurrency ⁂
Concrete ⁂
Build systems ⁂
Basic ⁂
Automatic differentiation ⁂
Audio ⁂
Art ⁂
Arrays ⁂
Arduino ⁂
Yttria ⁂
Web scraping ⁂
Veskeno ⁂
Utopias ⁂
Transactions ⁂
Toxicology ⁂
TeX ⁂
Ternary ⁂
Sparkle ⁂
Sorting ⁂
Small is beautiful ⁂
Silicone ⁂
Scanning probe microscopes ⁂
Rutile ⁂
Quotes ⁂
QEMU ⁂
Projectors ⁂
Programming languages ⁂
Prefix sums ⁂
Politics ⁂
Pocket furnaces ⁂
Pidgeon process ⁂
Phosphates ⁂
Paeth rotation ⁂
Padauk ⁂
Oscilloscopes ⁂
Octave ⁂
Numpy ⁂
Muriate of lime ⁂
Monoids ⁂
Mole people ⁂
Minsky algorithm ⁂
Metamaterials ⁂
Merging ⁂
Magnesium ⁂
LSM-trees (log-structured merge trees) ⁂
The Long Now Foundation ⁂
Logic ⁂
Lime ⁂
Kafka ⁂
The JS language ⁂
Interrupts ⁂
Immediate-mode GUIs ⁂
FPGAs ⁂
FP-persistent data structures ⁂
Flying machines ⁂
Flexures ⁂
Étendue ⁂
Errors ⁂
Epistemology ⁂
Energy efficiency ⁂
Earthships ⁂
Drying ⁂
Docker ⁂
Corewar ⁂
Copy on write ⁂
Copper ⁂
Compressed sensing ⁂
Compilers ⁂
Collapse ⁂
Clusters ⁂
Chifir ⁂
Chat ⁂
Content-centric networking/named-data networking ⁂
Casting ⁂
Carborundum ⁂
Cameras ⁂
Bootstrapping ⁂
Bearings ⁂
Batteries ⁂
B-trees ⁂
Automata theory ⁂
Assembly language ⁂
