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使用MATLAB对通信中的一种调制技术QPSK进行编程实现，分析其误码率(The use of MATLAB for communication in a QPSK modulation technique to program implementation, analysis of its error rate)

对于通信原理中的调制解调进行说明，并且用MATLAB给出了仿真。(For modem communication theory is described in, and the simulation with MATLAB.)

说明：  matlab代码，新进的emd分解工具，比小波效果好(Matlab code, the new EMD decomposition tool, is better than wavelet)

Position Localization

在matlab图片处理中加入噪声，是图片不再清晰(Add noise in matlab image processing, is no longer clear picture )

SPSS file, for the beginner,very good SPSS file, for the beginner,very good

Scientific communication and publishing

说明：  henon 分岔图与相图的绘制。能够得出各种条件下的相图与分岔图，并进行分析。(henon bifurcation diagram and phase diagram drawing. Able to draw the phase diagram of various conditions and bifurcation diagram, and analyzed.)

一种全局的直接优化方法，优化过程中无需用到目标函数的导数信息。(The purpose of this brief user guide is to introduce the reader to the DIRECT optimization algorithm, describe the type of problems it solves, how to use the accompanying MATLAB program, direct.m, and provide a synopis of how it searches for the global minium.)

说明：  计算海洋中海水密度，对于物理海洋学生很重要(It is important for physics students to calculate the density of seawater in the ocean)