四面体单元

重力异常正演代码，请好好使用它。帮助学习。。。。(Gravity anomaly forward code, please use it well. Help learn)

berkeley加州大学SAP系列软件之SolidSAP，由Edward L.Wilson教授开发的三维结构源程序，功能强大，代码清晰，含学习手册。(SolidSAP, a three-dimensional structure source program developed by Professor Edward L. Wilson, is a software of the SAP series at the University of California, Berkeley. It has powerful functions, clear code and learning manual.)

求解O-S方程特征值，可以适用于多种条件下的O-S方程特征值计算(To solving OS Equation characteristic value, can be applied to a variety of conditions OS equation eigenvalue calculation)

本源代码是利用MATLAB逻辑工具箱诊断变压器故障。其中的相应数据及说明文档在word中总结。(Source code is the use of MATLAB Logic Toolbox for Transformer Fault Diagnosis. The corresponding data and documentation in word summary.)

基于P-Q分解法的快速潮流计算,可用于实际系统(The fast power flow calculation based on P-Q decomposition method can be used in practical system.)

列主元素高斯消去法，硕士研究生数值分析课程内容(Out the main elements Gaussian elimination, graduate numerical analysis course content)

关于焊接残余应力的Abaqus子程序-DFLUX(The Abaqus subprogram-DFLUX on welding residual stress)

说明：  非线性振动.pdf 刘延柱编写 恢复力与位移不成正比或阻尼力不与速度一次方成正比的系统的振动。尽管线性振动理论早已相当完善,在工程上也已取得广泛和卓有成效的应用，但在实际问题中，总有一些用线性理论无法解释的现象。一般说，线性模型只适用于小运动范围，起出这一范围，按线性问题处理就不仅在量上会引起较大误差，而且有时还会出现质上的差异，这就促使人们研究非线性振动。(Nonlinear Vibration. Compilation of PDF Liu Yanzhu)

branchbound就是所谓的分支定界算法，应用于动态规划解决实际问题(branchbound is called the branch and bound algorithm applied to the dynamic programming to solve practical problems)

三个MATLAB里实现傅里叶变换FFT的源程序代码，每种代码都进行了作图演示(Three in MATLAB source code to achieve Fourier Transform (FFT), each code have been mapped demo)