USB规范，特别是USB2.0高速规范，其中重点介绍了USB HUB规范

把文件隐藏到图片中-documents to hide pictures

发射部分采用锁相环式频率合成器技术， MC145152和MC12022芯片组成锁相环，将载波频率精确锁定在35MHz，输出载波的稳定度达到4×10-5，准确度达到3×10-5，由变容二极管V149和集成压控振荡器芯片MC1648实现对载波的调频调制；末级功放选用三极管2SC1970，使其工作在丙类放大状态，提高了放大器的效率，输出功率达到设计要求。-Part of the launch phase-locked loop frequency synthesizer using technology, MC145152 and MC12022 PLL chips to lock in the exact carrier frequency 35MHz, the output carrier to achieve the stability of 4 × 10-5, reaching the accuracy of 3 × 10-5 by the varactor diode V149 and integration to achieve MC1648 chip VCO FM modulation on the carrier selection transistor amplifier at the end of class 2SC1970, to work in the C state to enlarge and improve the efficiency of the amplifier output power to meet the design requirements.

读出autocad图形数据库中的实体并将实体类名写入excel-read graphical database entities of the entity type who would write excel

漂亮的无极限三层架构，用ajax自动分页，很不错，值得学习！-Unlimited beautiful three-tier structure, with automatic paging ajax, very good, it is worth learning!

一个小的lindo，做数学建模的同志们应该知道吧，不知道你们用得上不。以后有好东西再给大家送来-A small lindo, make mathematical modeling comrades should know, I do not know you is not useful. After the U.S. has brought good things to give

图论的一些常用代码，包括最小生成树，拓扑排序，最短路径（非负权和负权）-Graph theory, a number of commonly used code, including the minimum spanning tree, topological sorting, shortest path (non-negative and negative rights)

计算GPS卫星的坐标值 用文本格式输入星历表 -calculate GPS planet s coordinate and put the form by text

一个3ds max源码,挺不错得,可以用来编辑和用来做示范-3ds max a source, a very good

在Matlab环境下的kalman滤波程序，有助于理解kalman的原理及其应有-1234566KALMAN

zoomig and add-subtract and multiplying image