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是一个检测飞船与陨石碰撞的程序，让你了解一般2D游戏DirectX的开发过程。-detection spacecraft is a meteorite collision with the procedures, let you know the general game 2 D DirectX development process.

java 实现的雪花效果-朵朵雪花从天而降,效果生动.-achieve snowflakes effects-countless snowflakes fall from the sky and vivid effect.

基于MATLAB的微动目标的信息提取，一人的呼吸心跳为例。(Based on MATLAB s information extraction of micro- moving target, one person s breathing heartbeat as an example.)

PHP动态流输出下载，比常规下无安全，上传后自动HASH后保存！-Dynamic stream output download, no security than conventional next!

BK4813外部电路设计使用时应注意事项(Design of BK4813 External Circuit)

说明：  利用天牛须算法改进了BP神经网络，提高了预测精度(Optimize the bp Shenjiang network)

SVPWM的主要思想是以三相对称正弦波电压供电时三相对称电动机定子理想磁链圆为参考标准，以三相逆变器不同开关模式作适当的切换，从而形成PWM波，以所形成的实际磁链矢量来追踪其准确磁链圆。传统的SPWM方法从电源的角度出发，以生成一个可调频调压的正弦波电源，而SVPWM方法将逆变系统和异步电机看作一个整体来考虑，模型比较简单，也便于微处理器的实时控制。(The main idea of SVPWM is that the ideal magnetic chain circle of the three-phase symmetrical motor is used as the reference standard when the three-phase symmetric sine wave voltage is supplied, and the PWM wave is formed by the proper switching of the three phase inverters in different switching modes, and the accurate magnetic chain circle is traced with the actual flux vector formed. The traditional SPWM method starts from the angle of the power supply to generate a frequency modulation voltage regulating sinusoidal power supply. While the SVPWM method considers the inverter system and asynchronous motor as a whole, the model is simple and convenient for the real-time control of the microprocessor.)

介绍如何使用 Macromedia Dreamweaver MX 2004，其对象是对该软件的主要特 性尚不熟悉的用户。本指南中的教程将引导您完成创建一个简单但具备一定功能的 Web 站点的过程(How to use Macromedia Dreamweaver MX 2004, its object is the main features of the software is not yet familiar with the user. Tutorial in this guide will walk you through creating a simple but functional Web site with a certain process)

说明：  单摆方程线性和非线性求解代码，具有非常深远的意义，非常适合初学者使用，代码简洁有效(Simple pendulum equation linear and nonlinear solution code, has a very profound significance, very suitable for beginners, code simple and effective)

说明：  本例子可实现规划路径的路径跟踪，采用纯跟踪的方法，附动画(Path tracking for planned paths)