XUE-Saltwater_intrusion_into_the_Changjiang_River

无线电侦察信号分析与处理的经典书籍，具有重要的指导作用(Radio reconnaissance signal analysis and processing of classic books, has an important role in guiding)

本文通过对男性和女性声音的语音特征的研究，发现男女声的基音频率存在较大的差异，并设计了基于基音频率分析的男女声识别系统。男女声识别系统由以下三个模块电路构成：话筒放大器，低通滤波器，半波整流电路，单片机测量控制模块。话筒放大器采用NE5532P音前置芯片，对语音信号进行放大；八阶低通滤波器MAX293完成基音信号的提取；单片机STC12C5410AD实现频率测量和控制输出功能。经仿真与电路实测，男女声的识别效果良好。(In this paper, the voices of male and female voice characteristics of the findings of a study of the fundamental frequency of the sound of men and women there is a big difference, and the design of frequency analysis based on the pitch of the voice recognition system for men and women. Voice Recognition System for men and women from the circuit the following three modules: the microphone amplifier, low-pass filter, half-wave rectifier circuit, single-chip measurement control module. NE5532P sound using the microphone pre-amplifier chip amplification of voice signals eight MAX293-order low-pass filter to complete the extraction of pitch signal STC12C5410AD single-chip realization of the frequency of measurement and control output. By circuit simulation and measurement, the identification of male and female voices well.)

control system engineering ogata

一本关于黑客的电子书,这本书很火，在网上很难下载(o other about hacker book ,my girl friend is a hacker, the book is very splendid)

子类方法不可比父类方法抛出更多的例外。子类抛出的例外或者与父类抛出的例外一致，或者是父类抛出例外的子类型。或者子类型不抛出例外。(Class methods are not comparable to the parent class method throws more exceptions. The subclass thrown exception or thrown with the parent class exceptions, or the parent class throw exception sub type. Do not throw exceptions or sub type. )

清华大学庄茁教授编写的《Abaqus 非线性有限元分析实例》(Abaqus nonlinear finite element analysis)

说明：  R软件安装及应用，R上输入下图中红色的命令，之后再弹出来的镜像那个选一个比如香港(Installation and Application of R Software)

此篇文章为虚拟机实验指导书系列文章之一，讲解了(VMware)虚拟机相关产品安装配置和一般应用，企业及应用等多个方面，(This article is a virtual machine instructions series of experiments to explain the (VMware) install and configure the virtual machine related products and general applications, enterprise and application in many areas,)

Lua 程序设计经典入门书籍 带书签,还可以 看看吧(Lua programming classic introductory books)

高阶累积书籍，包含了双谱，1.5维谱的讲解和编程，值得拥有(High-end accumulation of books, including the bispectrum, lectures and programming 1.5 dimensional spectrum, worth having)