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This notebook numerically integrates the Friedman equation (18.78) to find a homogeneous isotropic cosmological model.

与传送带有关的应用程序，通过此程序能够实现传送带的控制功能(Belt)

4）读取音乐信号romanza_pe.wav, 截取其前10s信号，选择适当的窗口类型和窗口宽度，显示其短时傅立叶频谱，以便能更清晰地看清谱线。说明信号频谱特点。 5）令D=5下采样音乐信号，播放其声音并显示其短时傅立叶频谱。描述并解释你所听到的声音和观察到的频谱之间的关系() Read the music signal romanza_pe.wav, intercept its first 10 s signal, select the appropriate window type and window width, display its short-time Fourier spectrum, so as to be able to see the spectrum lines more clearly. The characteristics of signal spectrum are explained. 5) let D=5 sample the music signal, play its voice and display its short-time Fu Liye spectrum. Describe and explain the relationship between the voice you hear and the observed spectrum.)

emacs中文教程 其中包含了emacs下函数的编写和试调技巧 ，以及emacs的配置方法。上传一下与大家分享。(emacs Chinese tutorial which includes the preparation and trial skills transfer function under emacs and emacs configuration methods. Upload about to share with you.)

说明：  BM1422 KX224 驱动代码，实现方位角姿态解算(BM1422 KX224 Driver code)

DNA编码，以及利用混沌系统对数字图像进行加密。(DNA coding and digital image encryption using chaotic system.)

正则表达式的一般用法。测试一下，能否下载(In this paper, we present the generalized result about the regularity of operators.)

VC++ 通过点击按钮更换窗口皮肤风格，换肤后的窗口没有做出来，只是实现了一个换肤的逻辑，让初学者明白如何在VC++中实现窗口的换肤功能。

一种可在线计算的优化控制方法：模型预测控制算法（MPC)(An online method of calculating the optimal control: model predictive control algorithm (MPC))

使用tensorflow进行机器学习开发的使用手册(the handbook based on tensorflow with python)