中国土壤特征数据集

德国纳粹二战时发明的密码机Enigma“迷”的复原模拟程序的源码.zip 好的图形界面，好的功能！-Nazi Germany in World War II invented the Enigma Cipher Machine, "The Riddler" recovery simulation program source code. Zip good graphical interface, a good functional!

java Servlet编程一书是讲述servlet如何在J2EE中扮演自己的角色。-a book is about how the J2EE servlet played since own role.

各类熵实验程序（香农熵、排列熵、近似熵等）(Various kinds of entropy experimental procedures(Shannon entropy, permutation entropy, approximate entropy, etc.))

Flash版鼠标跟随特效+源文件，会自动复制图形的鼠标特效，一边旋转一边跟随鼠标移动，鼠标移动到哪里，它就会跟向哪里。

Flash圆环鼠标跟随动画附源文件,圆环在跟随鼠标的同时，做S形路线跟随，挺有喜感的效果。

　摘要: 文章分析了数字式交流伺服系统中的电子齿轮环节的作用, 介绍了电子齿轮的基本原理。给出了一 种在数字式交流伺服系统中实现电子齿轮功能的方法, 同时介绍了大规模可编程逻辑器件在这方面的应用。最 后分析了电子齿轮的控制精度(Abstract: This paper analyzes the digital AC servo system links the role of electronic gear, introduces the basic principles of electronic gear. Gives a digital AC servo system for electronic gear function method, also introduced a large-scale programmable logic device in this application. Finally the accuracy of electronic control gear)

说明：  卡尔曼滤波对自由落体的皮球跟踪应用，程序已调试，很好用，建议下载(Kalman filter for free falling ball tracking application, the program has been debugged, very useful, it is recommended to download)

说明：  C++性能优化指南 (带目录高清版)，pdf版本(C ++ Performance Optimization Guide (with catalog HD version), pdf)

说明：  这也是一本线性代数的教材，其讲法十分现代，抛弃了行列式为主的传统讲法，直接紧扣线性代数中最核心的算子理论。(This is also a textbook of linear algebra. Its teaching method is very modern, abandoning the traditional teaching method based on the determinant, and directly following the core operator theory in linear algebra.)

该文件提供微电网模型的基本组成部分，包括SUMULINK仿真图，计算公式等。(The file provides the basic components of the microgrid model, including SUMULINK simulation diagram, calculation formula, etc.)