Crystal oscillator Updated 2025-07-16
From Raw Crystal to Crystal oscillator
. Source. by United States Army Signal Corps (1943) CSV CLI tool Updated 2025-07-16
The generic tool recommendation question: unix.stackexchange.com/questions/7425/is-there-a-robust-command-line-tool-for-processing-csv-files
csvgrep from csvkit Updated 2025-07-16
Simple example:output:
printf '00,11,22\n33,44,55\n' | csvgrep -H -c2 -r '^11$' | tail -n+2
00,11,22
csvkit Updated 2025-07-16
Lots of features, but slow because written in Python. A faster version may be csvtools. Also some annoyances like obtuse header handing and missing features like grep + cut in one go: csvgrep and select column in csvkit.
csvtools Updated 2025-07-16
Build failed with
undefined reference to pcre_config
on Ubuntu 23.04: github.com/DavyLandman/csvtools/issues/18Unfortunately it is lacking some basic options, like optional header + selecting column by index on
csvgrep
(though csvcut
has it). The project seems kind of dead.Also unclear if it allows to filter + print only selected columns.
CUDA hello world Updated 2025-07-16
Cuisine Updated 2025-07-16
Cultured food Updated 2025-07-16
- 2024 www.uktech.news/foodtech/alternative-meat-research-centre-20240829A research centre examining the implementation of alternatives to meat, backed by £38m, will be launched by the University of Leeds.
- 2024 techcrunch.com/2024/08/04/even-after-1-6b-in-vc-money-the-lab-grown-meat-industry-is-facing-massive-issues/ "Even after $1.6B in VC money, the lab-grown meat industry is facing 'massive' issues"
- www.reuters.com/markets/commodities/hoxton-farms-raises-22-million-cultivated-animal-fat-2022-10-20/ Hoxton Farms, cultured animal fat
Cultured meat Updated 2025-07-16
Curie temperature Updated 2025-07-16
Variation of saturation magnetisation with temperature for Nickel
. Source. This graph shows what happens when you approach the Curie temperature from below. CuriousMarc Updated 2025-07-16
Has been going wild with restoration and reverse engineering of the Apollo moon mission.
Inside the WILD Lab of CuriousMarc by Keysight Labs (2022)
Source. - youtu.be/qwocVH3_1Eo?t=841 the IBM System/360 is insane!
Cybercrime Updated 2025-07-16
Cyborg beetle Updated 2025-07-16
Singapore's Remote-Controlled Cyborg Insects by Vice Media (2018)
Source. By Dr. Hirotaka Sato from Nanyang Technological University Singapore.
Cycling landscape of Cambridge's surroundings Updated 2025-07-16
Anywhere north, including NE and NW: fenlands, i.e. marshes. Quite a few quarries as well. Extremely flat, very uniform, towns often have to be on top of small hills to escape the incessant flooding. Norfolk Coast AONB is beautiful if you take a train ride first, the beaches are very wide and many of them have few people if you avoid a few very busy spots.
East and SE: rolling hills towards Suffolk and the coast. Beautiful county, both Dedham Vale AONB and Suffolk Coast AONB.
South: first one of the hilliest nearby areas around Elmdon and Arkesden, then gently going down to the lush Lee River valley.
Southwest: larger and larger cities as you move towards London. From a train starting point, you can reach the Northen Chilterns, for some serious hills.
West: mostly flat farmland until you hit the River Great Ousse.
Cycling lobbying group Updated 2025-07-16
- twitter.com/bicyclelobby
- Shifter YouTube channel: www.youtube.com/channel/UC9-ZlLTioqMZowRLZHscozw. Has many videos about making cycling as means of transport. He's from Calgary, Canada.
- banprivatecarsinlondon.com/ Ban Private Cars in London
- stopkillingcyclists.org
- Reclaim the Streets
- www.youtube.com/@NotJustBikes
- kidsonbike.org: they make some large bike rides to promote themselves, good method
- 2024 www.designboom.com/design/latvia-cyclists-car-skeletons-vehicle-size-10-10-2014/ cyclists with car skeletons
Cytosine Updated 2025-07-16
Cytosol Updated 2025-07-16
Daisy chain Bitcoin inscription Updated 2025-07-16
This is a term invented by Ciro Santilli, and refers to a loose set of uncommon Bitcoin inscription methods that involve inscribing one or a small number of payloads per Bitcoin transaction.
These methods are both inefficient and hard to detect and decode, partly because Bitcoin Core does not index spending transactions: bitcoin.stackexchange.com/questions/61794/bitcoin-rpc-how-to-find-the-transaction-that-spends-a-txo. This makes finding them all that more rewarding however.
On the other hand, they do have the advantage of not depending on any block size limits, as their individual transactions are very small.
d'Alembert operator Updated 2025-07-16
The laplace operator for Minkowski space.
Can be nicely written with Einstein notation as shown at: Section "d'Alembert operator in Einstein notation".
d'Alembert operator in Einstein notation Updated 2025-07-16
Given the function :the operator can be written in Planck units as:often written without function arguments as:Note how this looks just like the Laplacian in Einstein notation, since the d'Alembert operator is just a generalization of the laplace operator to Minkowski space.
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