ouheqi

此程序为基于abaqus开发的新单元，用于模拟地震等动力过程中水与结构相互作用，用于在结构表面施加附加质量(This program based on abaqus and development of new unit, used to simulate the interaction between waterand structure during the process of earthquake, which is used to calculate the mass property on the structure surface)

VORONOI_MOUNTAINS is a MATLAB program which makes a 3D surface plot of a Voronoi diagram. The Voronoi diagram divides up points in the plane by associating each point with the closest of a set of generator points.

周期图法谱估计需要对信号序列“截断”或加窗处理，其结果是使估计功率谱密度为信号序列真实谱和窗谱的卷积，导致误差的产生。本程序分别设计了周期图法,最大熵功率谱估计和Welch法以及它们的对比,最大熵功率谱估计目的是最大限度地保留截断后丢失的“窗口”以外信号的信息，使估计谱的熵最大。(Periodogram spectrum estimation signal sequence needs to " cut off" or add the window handle, the result is an estimated power spectral density of the signal sequence of the real spectrum and spectral convolution window, resulting in the generation of errors. The procedures were designed periodogram, maximum entropy power spectrum estimation and the Welch method and their comparison, the maximum entropy power spectrum estimation purpose is to maximize the retention of truncated after the loss of the " window" than the information signal, the entropy of the estimated spectrum maximum.)

地心坐标系下的经纬高坐标数据，转换为东北天坐标系下的坐标。输入为经纬高，单位为°。 matlab文件实现，调用函数名为：ECEFtoENV(Geocentric latitude and longitude coordinates of the high-coordinate data is converted to Northeast day coordinate system coordinates. Latitude and longitude input is high, the unit is.)

说明：  用于检验两个时间序列是否具有格兰杰因果关系(Used to test whether two time series have Granger causality)

用matlab编写的用于解决tsp问题的源代码，代码本身不完善，有一点问题，上载用的是普通word文档形式。(using Matlab prepared for the settlement tsp the source code, the code itself imperfect, it is, on the use of ordinary word document form.)

用Blackman-Tukey方法,MUSIC,MV,PHD,Welch方法来估计信号的功率谱(Use Blackman-Tukey,MUSIC,MV,PHD and Welch methods to estimate power spectrum density.)

说明：  Matlab例子，网上下载，仅用于学习交流。(Matlab example, downloading, only for learning exchanges..)

利用matlab求系统时间响应，用impulse函数和lsim函数对线性连续系统的时间响应进行仿真计算 (impulse function )

关于求解光在光纤中传播的非线性薛定谔方程的一些资料(Some information about solving the nonlinear Schrodinger equation of light propagation in the fiber)