LS-DYNA材料的二次开发-1

叠前时间偏移代码，fortran格式，可以用于三维地震数据处理，可以在此基础上进一步完善其应用范伟。(Kirchhoff time migration code fortran version)

说明：  通过两点法 计算水波的反射系数 海洋工程领域实用代码(The reflection coefficient calculation by two points method. Useful code for ocean engineering.)

箱体趋势突破EA，破解版本。(Box trend break through EA, break the version.)

说明：  形成低通滤波器及实际RC低通滤波电路的单位冲激响应与频谱图(Unit impulse response and frequency spectrum of low pass filter and practical RC low pass filter circuit)

锁相环matlab实现，可提取并网逆变器网测电压相位。(PLL based on matlab,extraction of voltage phase in grid connected inverters.)

说明：  生成节点阻抗矩阵的程序，以IEEE33节点系统为例，亲测好用。(The program was developed to generate the node impedance matrix, taking ieee33 node system as an example, which was easy to use.)

该程序是利用Matlab编写，用于RVE单元。施加周期性边界可以根据源码进行学习PBC原理。(The program is written in Matlab and used in RVE unit. Periodic boundaries can be applied to learn PBC principles based on source code.)

本软件专门用于管理餐饮行业的点菜单、加菜单酒水单等重要票据的领用及回收情况，保证票据管理科学化，规范化。(the specialized software for the management of the catering industry point of the menu, drinks menu-plus other important instruments of their use and recycling of paper to ensure that scientific management and standardization.)

说明：  多项式样条方法实现利率期限结构的拟合，有数据和MATLAB 求解程序(Estimating yield curves)

说明：  根据卫星坐标和接收站坐标来计算卫星高度角的一段程序，简单实用(A program for calculating satellite altitude angle based on satellite coordinates and receiving station coordinates is simple and practical.)