Ulysses' trip

Latest post

Jan 17, 2025, 14:49:18

Thanks a lot to plain text format, I can recover most of my important files from a broken disk by searching for certain strings in the files directly within the binary image of the disk.

#plaintext #datarecovery #disk

Articles

Jan 9, 2025
Why it is a bad idea to use GitHub for submiting school homework

It is common for school courses to require students to submit their homework using GitHub. However, this is usually a bad idea for several reasons.
- Categories: misc
- Tags: programming, github, school
Nov 15, 2024
How to use JavaScript in GitHub Actions without committing node_modules

I was creating my first GitHub Action. According to the official documentation, I should commit the node_modules to the repo or generate a script that bundles the whole node_modules if I want to create a JavaScript action. I think this is not good practice, so I try to find another way.
- Categories: guide
- Tags: javascript, github
Oct 10, 2024
Some understanding of Grassmann numbers out of intuition

I was briefly introduced to Grassmann numbers when I studied quantum field theory. I then had the natural question of how we can formally define them. In this article, I went with my intuition and tried to answer this question.
- Categories: math
- Tags: quantum field theory, linear algebra, abstract algebra
Sep 10, 2024
The notational convenience of imaginary time in the derivation of the metric in Poincaré coordinates

In general relativity, people usually choose one of the two major metric signatures. However, in certain cases, the imaginary time convention can be more convenient. Here is one of such cases: the derivation of the metric in Poincaré coordinates for the anti-de Sitter space.
- Categories: physics
- Tags: general relativity, ads space
Jul 1, 2024
The smallest wave packet in the lowest Landau level

The smallest wave packet in the lowest Landau level exists, and is a Gaussian wave packet. This turns out to be related to the coherent state of the harmonic oscillator.
- Categories: physics
- Tags: quantum mechanics, condensed matter physics
Jun 30, 2024
Regularizing the partition function of a hydrogen atom

The partition function of a hydrogen atom diverges (only considering bound states). However, we can regularize it to get finite answers. Different regularizations give the same result. They largely agree with the physical arguments for the case of the hydrogen atom at room or cold temperature, but this should be considered a mere coincidence. The results from regularized partition functions cannot generally be trusted.
- Categories: physics
- Tags: statistical mechanics, complex, regularization, long paper
Feb 21, 2024
Letting people know when you are asleep

While you are asleep, indicate that on your Discord and GitHub user status.
- Categories: guide
- Tags: android, github
Jan 8, 2024
Using nmcli to connect to eduroam in UCSB

Use nmcli to connect to eduroam in UCSB without using the configuration assistant tool provided by eduroam.
- Categories: guide
- Tags: linux, school
Dec 22, 2023
The duality between two plane trajectories related by a conformal map

The conformal map $\fc wz$ transforms the trajectory with energy $-B$ in potential $\fc Uz\ceq A\v{\d w/\d z}^2$ into the trajectory with energy $-A$ in potential $\fc Vw\ceq B\v{\d z/\d w}^2$ . I will prove this beautiful result and show some implications of it.
- Categories: physics
- Tags: complex, classical mechanics, canonical transformation, kepler problem, mathematical physics, vector analysis, long paper
Nov 19, 2023
Embed the latest Mastodon post in my website

I show the latest Mastodon post in my website hosted on GitHub Pages, and it does not require JavaScript on the client side. How do I do that?
- Categories: update
- Tags: web, jekyll, selfhosting