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本篇文章叙述了锁相环原理，是学习锁相技术不可多得一篇好文章(This article describes the principle of phase-locked loop, phase-locking technology is invaluable to learn a good article)

此为数字逻辑书上的答案，应该很多同学都需要吧，关于数字逻辑(This is the answer books, digital logic, it should be a lot of students need it, on the digital logic)

宾.杨（Bin Yang）的PAST算法（投影近似子空间跟踪算法）原文翻译.(PAST rotation invariance is used to solve the angle signal, This algorithm uses the minimum two multiplication to estimate the incidence angle)

CPLEX的学习资料，最近用这个软件的人越来越多了，尤其是PPT文件，很适合初学者快速入门 (CPLEX learning materials, most recently with this software, more and more people, and especially the PPT file, it is suitable for beginners Quick Start)

说明：  国外控制理论方向经典书籍，圣书。让大家对非线性的知识有一个系统的了解，对设计非线性控制和分析非线性系统的稳定性入门有很大的好处。(Let everyone have a systematic understanding of nonlinear knowledge, which is of great benefit to the design of nonlinear control and analysis of the stability of nonlinear systems.)

说明：  这是一本关于python编程的指导用书，非常全面(This is a very comprehensive guide book on Python programming.)

51CTO下载-第05章用户设备配置.pdf(51CTO downloads- Chapter 05 user device configuration pdf.)

ansys软件APDL命令流进行形状优化(ansys software APDL for shape optimization)

说明：  CPU读卡器的设计参考，实现CPU卡读写，以及NFC读卡需要的参考资料。(According to the design of CPU card reader, it realizes the reading and writing of CPU card and the basic reference for NFC card reading.)

该PPT介绍了怎样对IEL进行检索，充分使用其资料(the PPT on how to IEL retrieval, and make full use of its data)