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键是一种标准零件,通常用来实现轴与轮毂之间的周向固定以传递转矩，有的还能实现轴上零件的轴向固定或轴向滑动导向。在键连接设计时，间的高度和宽度根据轴的直径d选取，而键长L则根据轴上零件轮毂宽度B而定，通常L=B-（5—10）mm。键的尺寸确定后，再进行强度校核。而为了保证绝对安全，键的尺寸取值往往都趋于保守，所选键的尺寸大。本程序采用优化设计方法，在满足强度要求的前提下求出键的最小结构尺寸，证明键宽b和键高h的取值可以小于标准值。(Key is a standard part, often used to achieve between shaft and hub to transfer torque to a fixed week, and some can achieve a fixed axis or axial parts of the axial sliding direction. Key connection in the design, height and width between the shaft diameter d according to selection, and the bond length L is based on the width of the wheel shaft parts B and, typically L = B-(5-10) mm. Key size is confirmed, then strength check. In order to guarantee absolute security, key size values ??are often conservative, the size of the selected key to big. The program uses optimization methods to meet the strength requirements of the derived key premise of the minimum structure size, proved key width b and height h of the key values ??can be less than the standard value.)

Book Name: Software Engineering 7th Edition Solution Manual Author: Ian Sommerville Type: e-book (pdf) This solution manual can be also used with Software Engineering 8th Edition - Ian Sommerville book as well.(Book Name: Software Engineering 7th Edition Solution Manual Author: Ian Sommerville Type: e-book (pdf) This solution manual can be also used with Software Engineering 8th Edition- Ian Sommerville book as well.)

非常好的有限元课件（英文版）包括： 1.有限元基础 2.桁架结构 3.二维、三维结构 4.梁、框架结构 5.板壳结构 6.动力学分析(Finite Element Method and Application-PPT，include: 1.Foundations of FEM 2.Truss structures 3.2D and 3D solid structure 4.Beam and Frame Structures 5.Plate and Shell Structures 6.Dynamic analysis)

自己搭建的MATLAB-SIMULINK环境下的级联多电平逆变器基本单元 包括自己搭建的触发电路(MATLAB-SIMULINK environment to build their own cascade multi-level inverter basic unit includes a trigger circuit to build their own)

DirectShow技术实时捕捉视频流中的图像帧(DirectShow technology to capture real-time video stream of the image frame)

说明：  一个蚁群算法的图像处理程序！能够进行图像分割，提取图像边缘(An ant colony algorithm for image processing! To carry out image segmentation, image edge extraction)

标准的电源插口尺寸图，很难找的，没有封装可以自己根据尺寸画。(Standard power socket size chart, it is difficult to find, no package can draw their own according to size.)

说明：  工程师应该掌握的20个模拟电路，比较经典的电路！(20 analog circuits, engineers should master the classic circuit)

切换系统，分析其稳定性，并采用simulink仿真(Switching system, analyze its stability and simulation using simulink)

This program prints the random number.