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一本对于学习超声系统很有帮助的书，可以方便的查阅和理解。书中对于各类的超声例如医学超声，工业超声都有说明。(A book that is very helpful for the learning of ultrasonic systems can be easily consulted and understood. All kinds of ultrasound, such as medical ultrasound and industrial ultrasound are described in the book.)

Qt，和 wxWidget 一样，它也是一个标准的 C++库。但是它的语法很类似于 Java 的 Swing，十分清晰，而 且 SIGNAL/SLOT 机制使得程序看起来很明白——这也是我首先选 择 Qt 的一个很重要的方面，因为我是学 Java 出身的 :) 。不过，所谓“成也萧何，败也萧 何”，这种机制虽然很清楚，但是它所带来的后果是你需要使用 Qt 的 qmake 对程序进行预 处理，才能够再使用 make 或者 nmake 进行编译。并且它的界面也不是原生风格的，尽管 Qt 使用 style 机制十分巧妙的模拟了本地界面。另外值得一提的是，Qt 不仅仅运行在桌面环境 中，Qt 已经被 Nokia 收购，它现在已经会成为 Symbian 系列的主要界面技术——Qt 是能够 运行于嵌入式平台的。(Qt, and wxWidget, it is also a standard C++ library. But its syntax is very similar to Java' s Swing, very clear, and SIGNAL/SLOT mechanism makes the program seem to understand- and this is my first choice is a very important aspect of Qt, because I was born to learn Java :). However, the so-called " as also Xiao, also lost" , although this mechanism is clear, but its consequences is that you need to use Qt' s qmake program is preprocessed, it can be reused make or nmake to compile. And its interface is not the native style, despite the use of Qt style very clever mechanism to simulate the local interface. Also worth mentioning is that, Qt only run in the desktop environment, Qt has been acquired by Nokia, it has now become the main interface technology Qt Symbian series is the ability to run on embedded platforms.)

basic english sentence patterns

包含两本书：Telecommunication Breakdown_Concepts of Communication Transmitted via Software-Defined Radio以及它的中文版《软件无线电》(It contains two books: Telecommunication Breakdown_Concepts of Communication Transmitted via Software-Defined Radio and its Chinese version of " software radio" )

说明：  EMC_EMI培训教程。一共8集，此为第1部份。(EMC EMI training course)

本书系Brooks/Cole出版公司（Thomson Learning出版集团的下属子公司）2000年推出的BookWare系列丛书（BookWare Companion SeriseTM）之一种。该书提供了利用MATLAB的普及型学生版本在计算机上解决“现代通信系统”这门课程中涉及的几乎所有方面的问题的分析思路、方法、MATLAB脚本文件和处理结果的范例以及供学生自主学习研讨的习题。全书内容分为9章，分别是：信号与线性系统；随机过程；模拟调制；模拟/数字转换；基带数字传输；带限信道的数字传输；载波调制的数字传输；信道容量和编码；扩频通信系统。(modern_communication_system_using_MATLA)

Matlab系列。特征值计算各类算法分析(Matlab series. Eigenvalue calculation analysis of the various algorithms)

the document is a datasheet of Mifare 4K chip, and is useful to understand the Mifare applications

说明：  概书关于风机系统在matlab/simulink开发中模拟开发过程,是学习风力发电仿真模拟的很好材料.(The Ebook descripts the development of wind turbine system in matlab/simulink environment. It s a very useful book to learn wind turbine system in matlab.)

说明：  PFLD的python实现，用于人脸的关键点检测(Python implementation of PFLD for key point detection of human face)