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该设计以AT89S52单片机为核心，霍尔传感器测车速，实现对自行车里程、速度、时间、温度的测量统计，采用存储器24C32实现在系统掉电的时候保存里程信息，并能将自行车的里程及速度用LCD实时显示。文章详细介绍了自行车测速仪的硬件电路和软件设计。硬件部分利用霍尔元件将自行车每转一圈的脉冲数传入单片机系统，然后单片机系统将信号经过处理送LCD显示。软件部分用C语言进行编程，采用模块化设计思想。该系统硬件电路简单，子程序具有通用性，完全符合设计要求。

一个可以生成标准翼型坐标，并对翼型在不同攻角下进行升力系数及阻力系数计算的软件。-Can generate a standard airfoil coordinates, and the airfoil at different angle of attack carried out under the lift coefficient and drag coefficient calculation software.

一个完全免费的条码打印控件-a free barcode printing controls

For any software that handles client requests, at some point, there must be a persistent point where all data related to the clients are stored. Those storages can be any thing (database, mainframes, files etc.). What if this software needs to access those storages with concurrent requests, knowing that opening a connection is memory and CPU consuming? A Connection Pool is a container of open and reusable connections. It will help you save both memory and CPU time. Also, it will help you in managing connections.

视频教程，不用多说了，一看就会了 开发环境搭建XP+VMware+Redhat9.0安装教程-Video tutorials, Needless to say, and one will see the development environment to build XP+ VMware+ Redhat9.0 Installation Tutorial

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三点等距插值 距离相等-3:00 equidistant from the same interpolation

Matlab linear approximator

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操作系统的一些有用的题目-operating system some useful topics