关于利用褶积的方法计算雷克子波的一阶导和二阶导。-Methods on the use of convolution calculation Leike Zi waves and second derivatives of a derivative.

2维声波方程，时间2阶精度，空间六阶精度，恒密度介质。程序里包含吸收边界和自由边界。-2-dimensional acoustic wave equation, time second-order accuracy, spatial sixth-order accuracy, constant density of the medium. Program contains absorbing boundary and free boundary.

5个f语言有限差分正演程序，应用有限差分法在CPML边界条件下进行2D正演，前四个程序分别对应各向异性介质、各项同性2阶精度、各项同性4阶精度、双相介质4阶精度四种不同情况。最后一个是3D粘弹性介质的程序。-5 f language finite difference modeling, application of finite difference method under CPML boundary conditions 2D forward, the first four program

基于SOGI（2阶广义积分器）的单相锁相环simulink仿真，参考《光伏与风力发电系统并网变换器》周克亮译 71页-Based on SOGI (2-order generalized integrator) single-phase phase-locked loop simulink simulation, refer to Grid Converters for Photovoltaic and Wind Power Systems translated by Zhou Kelian