第7章实例：压电变换器的自振频率分析

基于GWBASIC实现的无约束寻优算法，内附GWBASIC主程序和说明(Non-binding on GWBASIC achieve optimization algorithm, the main program and instructions included GWBASIC)

Umat for GTN damage material model in Abaqus by UMAT - STATIC in Levenberg-Marquardt (LM) solution routines from Slatec library

frictional model to analysis in abaqus, a good subroutine to build a new frictional relationship

用栈的思想实现的简易计算器，可直接输入表达式，然后自动计算结果(Ideology with a stack of simple calculator, you can directly enter an expression, then automatically calculated)

计算回测程序，多因子选股模型，单因子测试(Calculation of back - test program, multi - factor stock - picking model, the single factor test)

这是大地电磁一维正演程序，只要输入电阻率和深度即可正演计算；使用的是卡尼亚视电阻率公式，有关说明已经在文件中说明。(This is a one-dimensional magnetotelluric forward the program, as long as the input resistivity and depth to forward calculation use Carney ATV resistivity formula, and instructions in the file description.)

实现最小二乘的仿真函数，有3次和9次多项式的拟合。(Realize the simulation of least squares function, has 3 times and 9 times polynomial fitting.)

TOCHNOG PROFESSIONAL，有限元开源源程序。c++语言(TOCHNOG PROFESSIONAL, finite element open source. c++ language)

说明：  利用二阶循环统计量去除同频带干扰的影响，同时，当信号为相干信号时，也可以去相关，得到较好的结果，(Using second-order cyclic statistics to remove the influence of interference in the same frequency band)

音频信号通过LM386放大，计算两个矩阵之间的欧氏距离，电力系统暂态稳定程序，可以进行暂态稳定计算。( LM386 audio signal amplification, Calculation of the Euclidean distance between the two matrices, Power System Transient Stability Program, can be transient stability.)