Friday, June 26, 2009

Thursday, June 25, 2009

To Understand the Boltzmann Transport Equation

Here are some internet resources

1. The easiest and vivid explanation of BTE: http://homepage.univie.ac.at/Franz.Vesely/sp_english/sp/node7.html

2. Fundamental textbook: Microscale energy transport By Chang L. Tien, Arunava Majumdar, Frank M. Gerner

3. Explanation of phonon dispersion: http://www.chembio.uoguelph.ca/educmat/chm729/Phonons/intro.htm

Study notes:
Phonon
1)An ensemble of travelling waves having a certain frequency, n, a certain group velocity, Vg , and carrying with it energy equal to hn , where h is the Planck constant.
2)Just as light is a wave motion that is considered as composed of particles called photons, we can think of the normal modes of vibration in a solid as being particle-like. Quantum of lattice vibration is called the phonon.

Wave Vector k -- a vector which points in the direction of propagation of the wave.
Phonon Dispersion -- the relation between phonon frequency(energy) and wave vector


Friday, June 19, 2009

K教授

仙风道骨的原子传热学领域大拿K教授上周来公司传道解惑。看见他,就好像孙悟空当初看到菩提大师,心里喜的只能用抓耳挠腮来表现。世间还是有贤人的!

Wednesday, June 17, 2009

星期二 lousy

星期二是昨天。早起新闻说最近东部气候异常,总是刮风下雨,有市民甚至质疑今夏到底还有没有像样的夏天天气了。昨天就是一个这样的阴风飕飕,冷雨飘飘的日子。所以我很blue。

大狮说不能理解,“觉得这是心理不健康的表现。症状持续的话,考虑吃药吧。”

道长很理解,道长说“日照对动物的影响是非常大的。比如熊身体内负责冬眠的激素就是和日照直接相关的。以前认为熊冬眠是因为食物减少,饿了就冬眠。但是后来证明不是。有时候秋天收成不好,熊会活活饿死都无法通过提前进入冬眠来节省体能。而有时候收成好,到了冬天仍然有很多事物,熊一样会冬眠。
天气晴朗有利于人类打猎采果子。这时候,我们身体就会为出去打猎采果子做准备,兴奋起来。这个是进化的结果吧。其它动物看他们的生活习惯,“好天气”的标准也会和我们不一样的吧。”

总之在这样一个潮唧唧的天气里,自我调节很重要,下班后我决定去游泳。可是游泳池那里居然在开居民联欢运动会。

有啥好说的呢, C'est la vie!

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