电子科技大学：《数字信号处理 Digital Signal Processing》课程教学资源（课件讲稿）Chapter 02 Discrete-Time Signals and Systems

一、Fourier变换的几种可能形式 二 、周期序列的DFS及其性质 三、离散傅里叶变换（DFT） 四、离散傅里叶变换的性质 六 、抽样z变换——频域抽样理论 七 、用DFT对模拟信号作频谱分析 八 、序列的抽取与插值

复旦大学：《离散数学 Discrete Mathematics》英文讲义_13 Tableau Proof of Predicate Logic

深圳大学管理学院：《运筹学》课程教学资源（PPT课件讲稿）专题（计算机仿真）计算机仿真 A Brief Introduction to Discrete-Event Simulation Modeling and Analysis

6.0 Introduction 6.1 Block Diagram Representation of Linear Constant-Coefficient Difference Equations 6.2 Signal Flow Graph Representation of Linear Constant-Coefficient Difference Equations 6.3 Basic Structures for IIR Systems 6.4 Transposed(转置) Forms 6.5 Basic Network Structures for FIR Systems

利用离散单元法（Discrete element method，DEM）对球形颗粒群以及非球形颗粒群的筛分过程进行了仿真并开展了实验研究，结果表明球形和非球形颗粒的仿真与实验中筛分效率的变化是一致的，但非球形颗粒的仿真结果与实验结果更接近。正交设计多组模拟试验，分析了各振动参数（振动频率、振幅以及筛面倾角）对颗粒分布曲线、筛分效率以及物料平均运输速度的影响规律。对正交试验表中的数据进行多元非线性拟合，得到筛分效率与振动参数间的关系式；并在此关系式的基础上，对振动参数进行优化设计，得到了最优振动参数且在仿真中得到了验证。研究内容不但为高频振网筛振动参数的设计提供了理论依据，而且为研究高频振动系统的筛分机理提供了实验和仿真数据支持

8.1 素数 Prime Numbers 8.2 费马定理和欧拉定理 8.3 素性测试 8.4 Chinese Remainder Theorem 中国余数定理CRT 8.5 离散对数问题(discrete logarithm)

7.0 introduction 7.1design of discrete-time IIR filters from continuous-time filters 7.1.1 filter design by impulse invariance 7.1.2 filter design by bilinear transform 7.1.3 not low pass filter design and other method 7.2 design of FIR filters by windowing. 7.3 summary

The algorithm principles, features of the software package MOD and comparative study of the algorithim are presented. At the end of the algorithm perfermance curves and the evalutive results, and the design examples for mechanical engineering are given

The role of Mg in alloy/718 has been systematically investigated. Mg raises not only high temperature tensile and stress-rupture ductilities but also increases considerably smooth and notch stress-rupture life. Mg containing alloy 718M is free of stress-rupture notch sensitivity. Mg improves creep and fatigue interaction properties （LCF or cyclic stress rupture） at any grain size. The basic role of Mg is equilibrium segregation at grain boundaries which helps to change continuous grain beundary (5-Ni3Nb morphology to discrete globular form which has a retardation effect on intergranular fracture. Mg promotes the change from intergranular to transgranular fracture mode