简谐振子,波动方程和音速的导出

作为可压缩流体力学的基础概念,音速通常出现在教科书的最前端,从此引出亚音速/超音速流动的概念继而展开之后的话题。可惜的是大多数流体力学的教科书都采用一种流体的思考方式来导出音速,结果导致迷失了音速本来的物理本质,大大阻碍了读者对音速的体会。本文旨在介绍从经典力学的角度导出音速的方法,希望同学们看完以后可以豁然开朗从而把压缩性流体力学的书彻底烧掉(侬。。)。好嘛。。。Let’s get started

Read More

科学论文下马指南:Gnuplot篇

首先需要声明的是,论文最重要的是传达对他人有用的信息-我也十二分赞成您的观点。 但是如果你认为糟糠之妻拥有童颜和巨乳是一种精神折磨,那么请立刻关闭本页: 本文要讨论的方法从根本上不适合您的价值观。

Read More

粽子中的自然常数"e"

欧拉公式\(e^{ix} = cos(x) + i\cdot sin(x)\)可能是最莫名奇妙的数学公式之一。对于大多数人来说,问题在于公式的左边:

Read More

Power series, Taylor series and Functions

Since recently I am dealing with numerical solution of differential equation, I recalled that not long time ago I’ve actually learned about and Euler’s equation. They should be close related to the differential equation topic. So let’s review some of the conclusions I learned from the book: “オイラーの公式がわかる”.

Read More

Blogging Like a Hacker

It seems that i forgot to include sth. called the “front matter” in my post, thus my 1st blog didn’t go through the Jekyll engine. Now this blog post should be nicer…

Read More