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标签： ST LINK V2使用说明
上传时间： 2015-04-28
上传用户：lratusa
一种以硅单晶为基本材料的P1N1P2N2四层三端器件，创制于1957年，由于它特性类似 双向可控硅 于真空闸流管，所以国际上通称为硅晶体闸流管，简称可控硅T。又由于可控硅最初应用于可控整流方面所以又称为硅可控整流元件，简称为可控硅SCR。 在性能上，可控硅不仅具有单向导电性，而且还具有比硅整流元件（俗称“死硅 ”）更为可贵的可控性。它只有导通和关断两种状态。 可控硅能以毫安级电流控制大功率的机电设备，如果超过此频率，因元件开关损耗显著增加，允许通过的平均电流相降低，此时，标称电流应降级使用。 可控硅的优点很多，例如：以小功率控制大功率，功率放大倍数高达几十万倍；反应极快，在微秒级内开通、关断；无触点运行，无火花、无噪音；效率高，成本低等等。 可控硅的弱点：静态及动态的过载能力较差；容易受干扰而误导通。
标签： 双向可控硅实用电路500例
上传时间： 2015-05-07
上传用户：66998877
http://wenku.baidu.com/link?url=sUgQYw6hS66uzYWBhD5Qcu3_cJ4eXHMBHnZ_UYV5Mx9lVksfuw9ljiEgFRSRRa6o5oTeG7Kj02DC9aL60Oxx2rcVNzOSN3Z_J2A-1iHSUR7
标签： 课程设计
上传时间： 2015-05-07
上传用户：xyxfox
EPC 낮은 수준의 리더 프로토콜
上传时间： 2015-06-04
上传用户：gw0214
My JSP 'TeacherMain.jsp' starting page var $=function(id) { return document.getElementById(id); } function show_menu(num){ for(i=0;i
标签： C++
上传时间： 2015-07-03
上传用户：xiyuzhu
matlab有限元网格划分程序 DistMesh is a simple MATLAB code for generation of unstructured triangular and tetrahedral meshes. It was developed by Per-Olof Persson (now at UC Berkeley) and Gilbert Strang in the Department of Mathematics at MIT. A detailed description of the program is provided in our SIAM Review paper, see documentation below. One reason that the code is short and simple is that the geometries are specified by Signed Distance Functions. These give the shortest distance from any point in space to the boundary of the domain. The sign is negative inside the region and positive outside. A simple example is the unit circle in 2-D, which has the distance function d=r-1, where r is the distance from the origin. For more complicated geometries the distance function can be computed by interpolation between values on a grid, a common representation for level set methods. For the actual mesh generation, DistMesh uses the Delaunay triangulation routine in MATLAB and tries to optimize the node locations by a force-based smoothing procedure. The topology is regularly updated by Delaunay. The boundary points are only allowed to move tangentially to the boundary by projections using the distance function. This iterative procedure typically results in very well-shaped meshes. Our aim with this code is simplicity, so that everyone can understand the code and modify it according to their needs. The code is not entirely robust (that is, it might not terminate and return a well-shaped mesh), and it is relatively slow. However, our current research shows that these issues can be resolved in an optimized C++ code, and we believe our simple MATLAB code is important for demonstration of the underlying principles. To use the code, simply download it from below and run it from MATLAB. For a quick demonstration, type "meshdemo2d" or "meshdemond". For more details see the documentation.
标签： matlab有限元网格划分程序
上传时间： 2015-08-12
上传用户：凛风拂衣袖
DSP（digital singnal processor）是一种独特的微处理器，是以数字信号来处理大量信息的器件。其工作原理是接收模拟信号，转换为0或1的数字信号，再对数字信号进行修改、删除、强化，并在其他系统芯片中把数字数据解译回模拟数据或实际环境格式。它不仅具有可编程性，而且其实时运行速度可达每秒数以千万条复杂指令程序，源源超过通用微处理器，是数字化电子世界中日益重要的电脑芯片。它的强大数据处理能力和高运行速度，是最值得称道的两大特色
标签： dsp学习资料
上传时间： 2015-10-26
上传用户：plancking
Matlab 画三维立体图形 The aim of geom3d library is to handle and visualize 3D geometric primitives such as points, lines, planes, polyhedra... It provides low-level functions for manipulating 3D geometric primitives, making easier the development of more complex geometric algorithms. Some features of the library are: - creation of various shapes (3D points, 3D lines, planes, polyhedra...) through an intuitive syntax. Ex: createPlane(p1, p2, p3) to create a plane through 3 points. - derivation of new shapes: intersection between 2 planes, intersection between a plane and a line, between a sphere and a line... - functions for 3D polygons and polyhedra. Polyhedra use classical vertex-faces arrays (face array contain indices of vertices), and support faces with any number of vertices. Some basic models are provided (createOctaedron, createCubeoctaedron...), as well as some computation (like faceNormal or centroid) - manipulation of planar transformation. Ex.: ROT = createRotationOx(THETA); P2 = transformPoint3d(P1, ROT); - direct drawing of shapes with specialized functions. Clipping is performed automatically for infinite shapes such as lines or rays. Ex: drawPoint3d([50 50 25; 20 70 10], 'ro'); % draw some points drawLine3d([X0 Y0 Z0 DX DY DZ]); % clip and draw straight line Some functions require the geom2d package. Additional help is provided in geom3d/Contents.m file, as well as summary files like 'points3d.m' or 'lines3d.m'.
标签： Matlab 画三维立体图形
上传时间： 2015-11-02
上传用户：A1321
归一化是一种简化计算的方式，即将有量纲的表达式，经过变换，化为无量纲的表达式，成为标量。在多种计算中都经常用到这种方法。该段matlab代码即为实现信号的归一化，希望对大家有用。
标签： 归一化
上传时间： 2015-12-03
上传用户：遇见1314
基于51单片机+12864(st7920)的贪吃蛇游戏
标签： 单片机
上传时间： 2015-12-10
上传用户：wh22410
