1.三大检索工具简介 ·科技部下属的“中国科学技术信息研究所”从 1987年起,每年以国外四大检索工具SCI、ISTP、 E、ISR为数据源进行学术排行。 由于ISR(《科学评论索引》)收录的论文与SCI 有较多重复,且收录我国的论文偏少;因此, 自1993年起,不再把ISR作为论文的统计源。而 其中的SCI、ISTP、E数据库就是图书情报界常 说的国外三大检索工具

AC(alternating current) 交流(电) A／D(analog to digital) 模拟／数字转换 ADC(analog to digital convertor) 模拟／数字转换器 ADM(adaptive delta modulation) 自适应增量调制 ADPCM(adaptive differential pulse code modulation) 自适应差分脉冲编码调制

The purpose of a receiver is to select a desired group of frequencies from one transmitter, get rid of all unwanted signals and noise, and then demodulate the signal to obtain the modulating infomation. The better the receiver does its job, the closer the demodulated sigmal will resemble the original signal from the transmitter. Regardless of the type of demodula

经络腧穴学 经络腧穴学 刺法灸法学 刺法灸法学 针灸治疗学 针灸学 针灸学 针灸医经选读 实验针灸推拿学 中医工程技术与应用 推拿手法学一 推拿手法学二 推拿手法学 针灸推拿专业英语 嵌入式计算机系统 生物医学工程导论 数字信号处理 单片机原理与应用 医学物理学 生物医学工程实习 生物医学工程实习报告 信号与线性系统

经络腧穴学 刺法灸法学 针灸治疗学 针灸学 针灸医经选读 实验针灸推拿学 中医工程技术与应用 推拿手法学 针灸推拿专业英语 嵌入式计算机系统 生物医学工程导论 数字信号处理 单片机原理与应用 医学物理学 生物医学工程实习 生物医学工程实习报告 信号与线性系统

The burgeoning demand for mobile data net￾works has highlighted some constraints on its future growth. Wireless links have always had orders of magnitude less bandwidth than their wireline counterparts. Mobile users have always chafed at this limitation, which essentially forces them to use applications in a manner reminis￾cent of wireline networks of decades past

Bell Labs, Lucent Technologies, Crawford Hill Lab, Holmdel, NJ 07733, USA: herwig@lucent.com Abstract Optical communication has advanced into the tera-era deploying 1/2 terameter of fiber and carrying several Tb/s per fiber. Remaining challenges include extending the success of point-to-point long-haul to metropolitan networks and broadband access applications. Introduction Reflecting on the past 15 years of optical communication, one can only marvel at the amazing advances in this technology and in its applications

Unit 9 Computer virus Text 1 Virus Introduction Viruses will cause much confusion. Even some virus\experts\will misinform the cause of the virus. Let's define what we mean by virus a virus is a program that reproduces its own code by attaching itself to other executable files

Unit 7 The Fundamentals of computer Software Text 1 Data Structure A data structure is a data type. Its values are composed of component elements that are related by some structure Since a data structure is a data type, it has a set of operations on its values. In addition, there

Unit 4 the Fundamentals of computer Hardware Text 1 Organization of computer System components Now let's look at our computer definition: A computer is a fast and accurate system. It is organized to accept, store, and process data and produce output results. This section will explain