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1、实验四 外文数据库信息检索【实验目的】熟悉外文数据库信息检索系统的基本情况，掌握外文数据库信息检索系统的检索方法以 及检索结果的处理。学时安排：2 学时【实验要求】1、了解外文数据库的检索界面，熟悉文摘款目的著录格式及含义。2、学会基本检索和高级检索查找文献的方法及过程。3、根据课题，准确选用布尔逻辑算符、位置算符、截词符，制定出相应的检索式4、熟悉文摘的主要著录格式。5、熟悉索取原始文献的方法。实验内容】Ei数据库一、检索课题：（1）有关数字电视方面的文献（快速检索）（2）清华大学有关数字电视方面的文献（专家检索）访问网址：二、检索步骤：（一）快速检索(1)分析研究课题，确 定检索词：Dig
2、ital、TV 、television等，根据确定的检索词准确选用布尔算符、位置算符、截词符编写检索式 Digital and (TV or television) 。( 2)登录检索界面。进入南昌大学图书馆主页, 点击常用数据库列表下的_“Ei数据库”，进入数据库检索界面。( 3)在系统默认情况下选择 easy search。(4) 在检索框内输入 Digital and (TV or television)(5) 执行检索后，命中符合条件的文献10298篇。较切题的1篇文献摘要如下：Channel estimation methods of digital television terre
3、strial broadcastingYang, Zhi-Xing (Digital TV R and D Cent., Tsinghua Univ.); Wang, Jun; Pan, Chang-Yon ; Yang, Lin Source: Tien Tzu Hsueh Pao/Acta Electronica S,in30an 9, September, 2002, p 1298-1301Language: ChineseISSN: 0372-2112CODEN: TTHPAG Publisher: Chinese Institute of ElectronicsAbstract: T
4、he development of the Digital Television Terrestrial Broadcasting (DTTB) and channel characters of the DTTB are first described, and the channel estimation method for the DMB-T (Terrestrial Digital Multimedia/Television Broadcasting) standard innovated by Digital TV R and D Center of Tsinghua Univer
5、sity is then discussed in details. Comparing with other existing international standards of DTTB, we conclude that the channel estimation for DMB-T has advantages of low computational complexity and significant suppression of channel noise. (11 refs.)Ei controlled terms: Television broadcasting - Di
6、gital television- Channelcapacity - Estimation - Codes (symbols) - Computational complexity - AlgorithmsUncontrolled terms: Digital television terrestrial broadcasting - Channel estimation - PN codes - Digital multimedia terrestrial broadcastingClassification Code: 716.4 Television Systems and Equip
7、ment - 716Information Theory and Signal Processing - 723 Computer Software, Data Handling and Applications - 921 Mathematics - 721.1 Computer Theory, Includes Formal Logic, Automata Theory, Switching Theory, Programming TheoryDatabase: Compendex(二)专家检索(1) 根据确定的检索词准确地选用布尔逻辑算符、位置算符、截词符编写检索 式：(Digital
8、and (TV or television)AND (Tsinghua UNIV wn AF )(2) 选择检索方式： Expert search。(3) 输入检索式： (Digital and (TV or television)AND (Tsinghua UNIV wn AF )(4) 执行检索后，命中符合条件的文献_4_篇。较切题的 1 篇文献文摘如下： Channel estimation methods of digital television terrestrial broadcastiqg(l)Yang, Zhi-Xing(Digital TV R and D Cent., T
9、singhuaUniv.)；Wang, Jun: Pan, Chang-Yong: Yang, Lin (4)Source: Tien Tzu Hsueh Pao/Acta Electronica SV130C an 9, September, 2002, p 1298-1301 Language: ChineseISSN: 0372-2112 (7)CODEN: TTHPAG Publisher: Chinese Institute of Electronics Abstract: The development of the Digital Television Terrestrial B
10、roadcasting (DTTB) and channel characters of the DTTB are first described, and the channel estimation method for the DMB-T (Terrestrial Digital Multimedia/Television Broadcasting) standard innovated by Digital TV R and D Center of Tsinghua University is then discussed in details. Comparing with othe
11、r existing international standards of DTTB, we conclude that the channel estimation for DMB-T has advantages of low computational complexity and significant suppression of channel noise. (11 refs.)(10)Ei controlled terms: Television broadcasting - Digital television - Channel capacity - Estimation -
12、 Codes (symbols) - Computational complexity - AlgorithmsUncontrolled terms:QQ Digital television terrestrial broadcasting - Channel estimation - PN codes - Digital multimedia terrestrial broadcastingClassification Code: Q3)716.4 Television Systems and Equipment - 716.1 InformationTheory and Signal P
13、rocessing -723 Computer Software, Data Handling andApplications - 921 Mathematics - 721.1 Computer Theory, Includes Formal Logic, Automata Theory, Switching Theory, Programming TheoryDatabase: (14)Compendex说明：题名 第一作者 作者单位 第二、三、四作者 文献来源: 刊物名称、卷、期、月、年、页码 语种 ISSN号图书馆所藏文献和书刊的分类编号出版者 文摘QDEi受控词非受控词(13)Ei分
14、类码(数据库(5)打印或拷贝命中的检索记录。根据来源(刊名全称)_ Tien Tzu Hsueh Pao/Acta Electronica Sinica, v 30, n 9, September, 2002, p 1298-1301查联合目录数据库，或根据CODEN找到文献收藏单位，索取原始文献。二SCI 数据库一、检索课题：1、了解2007年诺贝尔物理学奖巨磁阻(giant magnetoresistance)最新进展和相关资料(通用检索)2、了解巨磁阻(giant magnetoresistance)发展进程和相关资料(高级检索)SCI 数据库介绍及使用方法：http:202120.96
15、.104:7777/shjkscihtm登录网址： 二、检索步骤：检索课题一：了解2007年诺贝尔物理学奖巨磁阻(giant magnetoresistance)最新进展和相关资料(一)通用检索1、登录南昌大学图书馆主页，进入资源数据库下的ISI Web of Knowledge平台, 点击“Web of Science数据库”,在“当前限制”的“引文数据库”选择Science Citation Index Expanded 数据库。2、分析检索课题，选择检索词：giant magnetoresistance。3、将检索词输入检索范围“标题”对应的检索框内。4、在“当前限制”的“入库时间”选择“2007-2009”得到命中文献135篇，其中1篇文献的题录信息如下：标题：Effect of high annealing temperature on giant tunnel magnetoresistance ratio of CoFeB/MgO/CoFeB magnetic tunnel junctions作者: Hayakawaa J, Ikeda S, Lee YM, et al.来源出版物： APPLIED PHYSICS LETTERS 卷： 89 期： 23 文献编号： 232510 出版年： DEC 4 2006被引频次：435、点击“全文
