使用jsp+my sql构成的电子管理系统。能实现借书，日记，激光唱碟，对在系统中登录的借用人进行管理的电子图书馆。 A web base electronic library that can lends books, journals, CDs, videos to borrowers who are registered in the system, as are the books and magazines. J2EE (JSP, Servlet and JDBC) & MySQL

此程序主要使用matlab模拟了垂直激光器谐振腔的核心部件DBR的工作过程，得到其阈值振荡曲线-This program is mainly use matlab to simulate the working process of the core components of the vertical laser cavity DBR, its threshold oscillation curve

propagation of intense ultrashort laser pulses in atmosphere

基于AT89C52的手持式激光超声测距仪，通过启动发送超声脉冲串开始计时，接收回波结束计时，同时测量周围环境温度，利用测得的温度进行修正声音在空气中传播的速度，该速度乘上传播时间除2即得到障碍物的距离。-AT89C52-based hand-held laser ultrasonic range finder, ultrasonic pulse through the string to start sending start time, receiving echo the end of ti