better-sqlite3 Node.js package Updated 2025-07-16 Nick Leeson and the Fall of the House of Barings by Adam Curtis (1996) Updated 2025-07-16
Oxford Master Course in Mathematical and Theoretical Physics Updated 2025-07-16
Giant-impact hypothesis Updated 2025-07-16
Isomer Updated 2025-07-16
Isomers were quite confusing for early chemists, before atomic theory was widely accepted, and people where thinking mostly in terms of proportions of equations, related: Section "Isomers suggest that atoms exist".
Ultra High Frequency Updated 2025-07-16
Microwave source Updated 2025-07-16
Microwave only found applications into the 1940s and 1950s, much later than radio, because good enough sources were harder to develop.
One notable development was the cavity magnetron in 1940, which was the basis for the original radar systems of World War II.
Microwave transmission Updated 2025-07-16
Microwave oven Updated 2025-07-16
How Microwaves Work by National MagLab (2017)
Source. A bit meh. Does not mention the word cavity magnetron! Mars sample-return mission Updated 2025-07-16
Human mission to Mars Updated 2025-07-16
Exception to the Madelung energy ordering rule Updated 2025-07-16
lujakob/nestjs-realworld-example-app SQLite port Updated 2025-07-16
Tried a quick port to SQLite to get rid of annoying local databases for development, but failed, at c1c2cc4e448b279ff083272df1ac50d20c3304faandthen:fails with:Attempt to hack it:and after that it seems to run.
npm install sqlite3 --save-dev{
"type": "sqlite",
"database": "db.sqlite3",
"entities": ["src/**/**.entity{.ts,.js}"],
"synchronize": true
}npm startDataTypeNotSupportedError: Data type "timestamp" in "ArticleEntity.created" is not supported by "sqlite" database.--- a/src/article/article.entity.ts
+++ b/src/article/article.entity.ts
@@ -20,10 +20,10 @@ export class ArticleEntity {
@Column({default: ''})
body: string;
- @Column({ type: 'timestamp', default: () => "CURRENT_TIMESTAMP"})
+ @Column({ default: () => "CURRENT_TIMESTAMP"})
created: Date;
- @Column({ type: 'timestamp', default: () => "CURRENT_TIMESTAMP"})
+ @Column({ default: () => "CURRENT_TIMESTAMP"})
updated: Date;I can signup and login, terrible error reporting as usual, make sure to use long enough usernames/passwords.
However, article creation fails with:
Unhandled Rejection (TypeError): Cannot read property 'slug' of undefined Essential metabolism for a minimal cell (2019) Updated 2025-07-16
Fabry-Pérot interferometer Updated 2025-07-16
Fabry Perot Interferometer by JFC UCL (2016)
Source. Description only, reasonable animations. Considers the case of two nearby beam splitters.Fabry-Perot Introduction by Williams College Physics (2020)
Source. Shows a working device. Confocal optical cavity, one of the mirrors scans back and forward moved by a piezoelectric motor, this is called a "scanning Fabry-Perot interferometer".
Does not produce an interference pattern, only an on/off blob, which is then fed into an oscilloscope for analysis. The oscilloscope shows both the mirror displacement (which is given by a voltage) and the light detector output.
Mach-Zehnder interferometer Updated 2025-07-16
Faraday effect Updated 2025-07-16
Fluorescent lamp Updated 2025-07-16
Neon lamp Updated 2025-07-16
feathersjs/feathers-chat Updated 2025-07-16
The main FeathersJS hello world demo. Notable missing things...
- instant Heroku deployability: FeathersJS Heroku deployment
- no Front-end web framework which sucks, but there are basically official demos that worked e.g. feathers-chat-react
- FeathersJS signup email verification
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