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说明：  功能： 1700 芯片SPI 工作模式下放音、录音、擦除等功能的编程示例 * * 硬件电路：参考中青世纪ISD1700-89c51 实验开发板电路(Functions: 1700 Chip SPI mode of devolution of sound, sound recordings, and other functions to erase the programming examples** hardware circuits: Reference Zhongqing ISD1700-89c51 century experimental development board circuit)

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.)

量化交易策略，华尔街宽客撰写，可值得参考。(Quantitative trading strategy, Wall Street quants writing, may be worth considering.)

公务员的电子试卷，做起来很方便，建议需要试试的同学下载这个软件。(Civil e-paper, make it very convenient, it is recommended the need for students to try to download the software.)

SIMULATION OF PACKET DATA NETWORKS USING OPNET In this paper we describe the use of the OPNET simulation tool for modeling and analysis of packet data networks.

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)

北大群论讲义，作为老师讲的讲义，还算通俗易懂。(North group theory lectures, as teacher handouts, fairly easy to understand.)

本书运用现代信号处理的理论，系统地介绍了分数阶Fourier变换的定义与特性，分数阶Fourier分析的基本原理与方法及其典型的应用。内容包括：分数阶Fourier变换的起源与发展、定义与基本特性；分数阶Fourier变换与其他时频分析工具的关系；分数阶Fourier变换的快速算法；分数阶Fourier变换在信号的检测与参数估计、雷达信号处理、时频域滤波以及通信信号处理中的应用。(The book is the use of modern signal processing theory, the system introduces the definition and characteristics of the fractional Fourier transform, fractional Fourier analysis of the basic principles and methods of its typical applications. Include: the origin and development of the fractional Fourier transform, the definition and basic characteristics fractional Fourier transform relationship with other time-frequency analysis tool fractional Fourier transform algorithm fractional Fourier transform in signal detection and parameter estimation The radar signal processing, time and frequency domain filtering and communication signal processing applications.)

计算几何,英文版,写的十分详细,适合初学者入门学习,老手也可丛中学到不少知识(Computational geometry, English, written in great detail, suitable for beginners study entry, a pair of veterans may also learn a lot of knowledge)

动态断裂教程，很经典，对理解动态断裂帮助很大，可以用abaqus实现(Dynamic fracture tutorial, very classic, a great help to understand the dynamic fracture, can use the implementation of abaqus)