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世博会城市距离模型，主要来算球面的最近距离，曲线到点的距离等(Expo City distance model, the main sphere to the most recent count from the curve the point of distance)

说明：  利用matlab实现牛顿下山法，便于数值分析计算(matlab niudunxiashan)

非参数的功率谱估计包括四个，周期图法，Blackman-Turkey,Welch-Bartell,改进的周期图法，输入信号为白噪声通过切比雪夫滤波后的信号(Non-parametric estimation of the power spectrum consists of four, periodogram, Blackman-Turkey, Welch-Bartell, improved cycle diagram method, the input signal is white noise ratio of the signal by cutting Schiff filtered)

Canny算子提取边缘，matlab进行图像处理，图像锐化(Canny edge extraction operator, matlab image processing, image enhancement)

此函数可以被用在角点和边缘检测，无论是彩色或者灰度图像都行.(This function can be used in corner and edge detection, whether it is color or grayscale images will do.)

for using this code need to use signal toolbox and general toolbox in your matlab Using Daubechies transform to compress the image (showing remaining coefficen of Thresholded Image) and then using Inverse 2D Daubechies transform and finding the SNR to see how well decompression works

一个关于谱分析的matlab源程序，尽供学习与研究使用(A spectral analysis of the source code, to do for learning and research use)

将叶轮的几何参数保存为desc格式，以便ISIGHT调用进行叶型优化。(compressor wheel,geometrical optimization,geometry parameter,desc,axcent,isight)

spread spectrum CDMA application

Purpose: build the ID array of system dofs to apply displacement constraints Synopsis: [csdof,sid]=fe_sdofID(discons,ndof,nnode) Variable Description: csdof - the number of system dofs after constraints applied sid - ID matrix of system dof formatted as nnode*ndof discons - matrix record the node of displacement constrain ndof - number of dofs per node nnode - number of nodes in system(Purpose: build the ID array of system dofs to apply displacement constraints Synopsis: [csdof,sid]=fe_sdofID(discons,ndof,nnode) Variable Description: csdof- the number of system dofs after constraints applied sid- ID matrix of system dof formatted as nnode*ndof discons- matrix record the node of displacement constrain ndof- number of dofs per node nnode- number of nodes in system)