sph代码学习，用来模拟流体

基于PSCAD的IEEE39节点测试系统，可实现电磁暂态仿真、机电暂态仿真以及小信号稳定性仿真分析等。通过E-TRAN将PSS/E数据转换为PSCAD模型，模型包含有E-TRAN的元件库等。(IEEE New England 39-bus test system based on PSCAD/EMTDC. The model can be used in electromagnetic transient simulations, electromechanical transient simulations, and small-signal stability similations. The model is developed by using E-TRAN to transform PSS/E data to PSCAD/EMTDC model.)

该程序为利用追赶法原理求解三对角矩阵的程序示例，非常容易理解，便于各位同行根据需要进行扩展，尤其是对于电磁、动力学以及数理领域，对于时域有限差分法中的ADI-FDTD、HIE-FDTD非常有用

说明：  将GNSS RINEX数据转换为电离层总电子含量(GTEX格式)(Convert GNSS RINEX data to Ionospheric Total Electron Content (GTEX format))

abaqus-uel cohesive subroutine

说明：  一种优化算法， 帝王蝶优化算法,一种新的元启发式优化算法！((In nature, the eastern North American monarch population is known for its southward migration during the late summer/autumn the northern United States and southern Canada to Mexico, covering thousands of miles. By simplifying and idealizing the migration of monarch butterflies, a new kind of nature-inspired metaheuristic algorithm, called Monarch Butterfly Optimization (MBO), a first of its kind, is proposed in this paper. In MBO, all the monarch butterfly individuals are located in two distinct lands viz. Southern Canada & northern United States (Land 1) and Mexico (Land 2). Accordingly, the positions of the monarch butterflies are updated in two ways. Firstly, the offsprings are generated (position updating) by migration operator, which can be adjusted by the migration ratio.)

信号处理，关于信号处理的emd方法。进行去噪和自动识别。(Signal processing, signal processing emd on the method. For denoising and automatic identification.)

线性相关 求逐月异常序列x(n,12)和y(n,12)(n是年)相同月份之间的滞后超前nt年的相关系数rt(-nt:nt,12)，其中nt最大的滞后或超前时间（单位：年）。 (Linearly related to demand monthly abnormal sequence x (n, 12) and y (n, 12) (n is the year) ahead of the same month lag between the years of the correlation coefficient nt rt (-nt: nt, 12), in which nt the largest lag or lead time (unit: years).)

ABAQUS 有限元子程序，粘弹性本构，蠕变应力松弛测试拟合结果 cohesive 粘接单元，用于分层分析的子程序，帮助初学者快速掌握ABAQUS的内聚体单元应用(ABAQUS umat creep stress relaxation fitting result Cohesive bonding unit, used for hierarchical analysis of the subroutine, to help beginners quickly grasp the ABAQUS cohesive unit application)

abaqus umat 子程序下载，官网经典例子！(abaqus umat composite)

一篇小论文，转子动力学方面多耦合结构研究，是一篇值得研究的论文，题目为椭圆轴承-转子系统的稳定性与分岔。(A small paper, the dynamics of multi-rotor coupling structure, is a worthy research paper, entitled elliptical bearing- Rotor System Stability and bifurcation.)