variableR.

!本程序主要用来解决二维平面应力弹性问题（带厚度），在f90上调试通过。 !包含主程序STRESS和三个字程序ELSTMX(KK)、MODIFY、DCMPBD和SLVBD !主程序主要进行基本的输入输出以及最大半带宽的计算，组装总体刚度矩阵计算的应力应变值 !子程序elstmx(kk)计算刚度系数矩阵，生成第kk单元的刚度矩阵k !子程序MODIFY输入节点的集中力，边界节点的位移，对总体刚度矩阵和位移数组和节点力数组作修改 !子程序DEMPBD用高斯消元法将半带宽的矩阵变成上三角阵 !子程序SLVBD为总体矩阵的回代求位移向量DD(! The program is mainly used to solve the two-dimensional plane stress elasticity problems (with thickness), the f90 debugging through. ! Contains the main STRESS and words program ELSTMX (KK), MODIFY, DCMPBD and SLVBD! Main program for basic input-output and maximum half bandwidth calculation, the overall stiffness matrix assembly calculated stress and strain values! Subroutine elstmx ( kk) calculate the stiffness coefficient matrix to generate a first kk element stiffness matrix k! subroutine MODIFY input node of concentration, the displacement boundary nodes, the overall stiffness matrix and nodal force and displacement array array modified! subroutine DEMPBD using Gaussian elimination element method for the semi-bandwidth matrix becomes upper triangular matrix! subroutine SLVBD overall matrix for the displacement vector DD back intercessions)

开关电源环路设计之基于MATHCAD的buck电路的设计(Switching power supply loop design based on the buck circuit design MATHCAD)

说明：  Fortran扭曲碳管等二维材料，高质量的分子动力学建模学习入门，很有用的短期提升。(High quality molecular dynamics modeling learning introduction, very useful for short-term promotion.)

利用坎门站的潮汐观测数据计算调和常数，并利用主要分潮和浅水分潮进行潮汐预报(Kanmen station observation data using tidal harmonic constants calculated, using mainly tidal and shallow water tidal surges were forecast...)

复合材料破坏失效vumat子程序，使用hsshin准则判断失效，具有刚度缩减，(The VUMAT subroutine for failure of composite materials is judged by hsshin criterion, and stiffness is reduced.)

IMSL Fortran Numerical Math Library Version 7.0

说明：  经典书籍Reinforced concrete structures-Park，钢筋混凝土研究必读书籍，主要介绍钢筋混凝土本构，非线性等相关方面的知识(Classic books Reinforced concrete structures-Park, Reinforced Concrete must-read book describes the structure of reinforced concrete, nonlinear, and other related knowledge)

在ABAQUS中，进行CZM模型的子程序开发，模拟复合材料的分层脱离(In ABAQUS, the CZM model subroutine is developed to simulate the layered separation of composite materials.)

说明：  复合材料疲劳寿命预测umat程序，用Fortran语言编写，在ABAQUS中应用(Composite fatigue life prediction UMAT program, written in Fortran language, and applied in ABAQUS)

理论地震学中用来求解理论模型的到时信息，用于各种震相的提取。(seismology for calculating synthetic travel time)