一、理解波动方程的物理意义，并会计算有关问题。 二、理解波的叠加原理和波的干涉。 三、了解声学的基本概念，理解声强、声强级的物理意义和多普勒效应，了解超声波的特性和在医学中的应用。 第二节 波动学基础 第三节 声学基础 第四节 多普勒效应

一 理解波动方程的物理意义，并会计算有关问题。 二 理解波的叠加原理和波的干涉。 三 了解声学的基本概念，理解声强、声强级的物理意义和多普勒效应，了解超声波的特性和在医学中的应用。 第二节 波动学基础 第三节 声学基础 第四节 多普勒效应

第一章软件设计基础 本章主要介绍在PC系列微机上上机操作的全过程,及所用系统软件的基本功能。 1-1系统软件及功能 1-2汇编源程序详细步骤 1-3汇编源程序一般结构

第1章数据库基础 学习要点 1、数据库系统的概念、特点、组成及分类 2、信息的三个领域 3、实体联系模型、数据模型 4、层次、网状、关系模型 5、数据库管理系统的功能、现状及发展方向

超重力显著增大两相间的重力差，可用于加速固?液、液?液、液?气高温黏稠混和体的相分离速度；超重力具有定向性，避免搅拌等技术产生的熔体湍流返混，可用于深度脱除金属液中细小夹杂物；超重力条件下固?液界面张力微不足道，可容易实现微孔渗流；超重力条件下进行结晶凝固，按结晶顺序实现固?液分离，可用于制备梯度材料；超重力加速固?液分离，可细化凝固组织晶粒，但对非共晶熔体也易产生宏观偏析。将超重力技术应用于冶金及材料生产过程中，有望解决高温冶金和材料制备的一些难题，如复杂矿冶金渣有价组分的分离提取、冶炼渣中金属液的分离回收、多金属的熔析结晶分离、复杂矿直接还原铁的渣?金分离；在高端金属材料方面，应用超重力技术，有望解决近零夹物金属材料的精炼除杂难题，提高梯度功能材料、金属?陶瓷复合材料、多孔金属材料、器件材料表面电沉积修饰的制造水平。此外，在材料科学研究方面，超重力凝固可作为一种材料基因组高通量制备方法

Chapter6 Transaction behavior on the internet 6.1 consumer buying behavior 6. 1. 1 What is Consumer Buying Behavior Buying Behavior is the decision processes and acts of people involved in bu product Need to understand why consumers make the purchases that they make? what factors influence consumer purchases? the changing factors in our society

Chapter 1 Introduction of Electronic commerce 1. 1 Development of Electronic Commerce(e-commerce 1.1.1 Histor Throughout history, attempts to promote new means of communication were simply means with which to increase opportunities for ease, efficiency and security. The foundations on which electronic commerce is based started 125 years ago with the use of telegraph

Chapter 9 The principle of ebXML 9.1 The introduction of ebXML 9.1.1 What is ebXML? ebXML is a global electronic business standard that is sponsored by UN/CEFACT(United Nations Center For Trade Facilitation And Electronic Business)and OASIS(Organization for the Advancement of Structural Information Standards). ebXML thus defines a framework for global

Chapter 7 Internet marketing 7.1. Introduction of internet marketing 7.1.1 Internet marketing defined What is internet marketing? Internet marketing or internet-based marketing can be defined as the use of the Internet and related digital technologies to achieve marketing objectives and support the modern marketing concept. These technologies include the Internet media and other digital

Chapter 5 Electronic commerce information's search and selection In physical markets, consumer search activities include reading advertisements, calling endors, and visiting stores. In a virtual marketplace, all these activities seem to converge into Web searches and Web browsing. Not surprisingly, search services are the first market infrastructure to be built in the electronic marketplace