About

Hi, I’m Guo — a student who keeps a running notebook of things worth remembering.

This site is that notebook, cleaned up and put online. Most of it is coursework and revision material: circuit analysis, analog electronics, physics, and the mathematics that ties them together. Some of it is rougher than the rest; all of it is written for the future me who has already forgotten the details.

I write in Chinese, but the site itself is kept in English — a small constraint that keeps the layout and navigation consistent.

What you’ll find

• Circuits — Thévenin equivalents, first- and second-order circuits, mesh analysis, phasors.
• Electronics — op-amps, transistor amplifiers, feedback, power stages.
• Physics — optics, thermodynamics, lab reports and exam revisions.
• Mathematics — complex analysis, probability, sequences, Taylor expansions.
• Reference — Markdown and symbol cheatsheets I keep coming back to.

About the site

Built with Astro on top of the AstroPaper theme, with a small table-of-contents rail added for long posts. Math is rendered with KaTeX, search with Pagefind, and everything is statically generated.

If something here is wrong, it is almost certainly my mistake — take it as notes, not as a textbook.