继电器自锁

陈国良 并行计算 PPT教程&pdf书籍(Chen Guoliang parallel computing PPT tutorials & pdf books )

说明：  shortest job fisrt operating system

用51实现播放音乐盒可以烧入51单片机中实现。播放音乐等，(Playing Music Box with 51)

I purchased an Ultimate Arduino Microcontroller Pack (you can order the pack online at Makershed or buy it at your local RadioShack). The pack comes with an Arduino UNO and ton of components. It would probably be cheaper to buy components as I need them for my projects, but I like the convenience of a starter kit. I also purchased a GPS module Digikey.com and a USB cable (it s too bad that the pack does not include the USB cable). The GPS receiver has a built-in antenna, but getting one with an external antenna would probably work best. From the pack, I ended using the Arduino UNO, the mini breadboard, a few stackable headers, jumper wires and the LCD screen.

加强肋 理想的设计 为了克服壁厚大可能引起的问题，使用是一种可减少壁厚并能增加刚性的有效方法。 一般来说，部件的刚性可用以下方法增强 增加壁厚； 增大弹性模量（如加大增强纤维的含量）； 设计中考虑。 如果设计用的材料不能满足所需刚性，则应选择具有更大弹性模量的材料。简单的方法是增加塑料中增强纤维的含量。但是，在特定壁厚下，这种方法仅能使刚性呈线性增长。更有效的方法是使用经过优化设计的。由于惯性力矩增大，部件的刚性便会增大。在优化的尺寸时，不但要考虑工程设计应当考虑的问题，还应考虑与生产和外观有关的技术问题。 优化的尺寸 大的惯性力矩可很容易地通过设置又厚又高的来实现。但是对热塑性工程塑料，这种方法常会产生制品表面凹痕、内部空洞和翘曲等问题。而且，如果的高度过高，在负荷下结构将有可能膨胀。出于这种考虑，必须在合理比例内保持的尺寸（见图1）。-stiffened ideal for the design of large thickness overcome the problems that may arise. use of a reduced wall thickness and rigidity can increase the effective method. In general, the rigid parts of the following methods can be used to enhance increased thickness; increased elastic modulus (such as increasing fiber content); Design considerations. If the design of the materials used can not meet the rigid requirements, they should have a greater choice of elastic modulus of the material. The simple way out is to increase plastics reinforced fiber content. However, in s

Js Select下拉框级联菜单，一共支持5级联动，相信够用了，这种菜单不用多介绍吧，后一级的值与前一级是父、子关系，该示例还演示了动态添加菜单、减少菜单的功能，还有显示/不显示空值的功能，如演示截图所示。

说明：  很全的代码，附加例子，特别容易理解，希望可以帮助到大家(Very complete code, additional examples, especially easy to understand)

在vb中镶入汇编、VC-in vb Insert from the Compendium, VC

水声信道仿真程序，来源于Parastoo Qarabaqi 和 Milica Stojanovic(Underwater acoustic channel simulation program, from Parastoo Qarabaqi and Milica Stojanovic)

基于matlab simulink标准滤波器的实现(The realization of MATLAB filter based on Simulink standard)