文献检索的基本原理英文版
pubmed文献检索PPT课件

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2. PubMed的主题词检索是其最具特色的 功能之一,能保证较好的查准率及查准 率。主题词组配副主题词使检索结果更 为专指,限定在主要主题词检索能使结 果更准确。
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3.但是主题词检索也有一些固有的缺陷, 比如很多专指的概念没有相应的主题词, 一些新出现的概念要几年后才收录为主 题词这种情况下,不宜采用主题词检索, 采用字段限定检索等方法也能得到较好 的查准率。此外,主题词检索还可能会 漏掉一些最新的文献(in process citations),这也是需要注意的。
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Clinical Queries临床咨询
研究范畴:一般疾病的病因学、预后、
诊断、预防以及治疗 Finding Systematic Reviews:提供系统 评价、meta分析、临床试验综述临床指 南等循证医学文献信息的查找
Medical Genetics Searches
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4)应用MeSH主题词的Major Topic(主 要主题词)检索:
可以使检索结果更加准确。
点选Restrictions Search to Major Topic headings only,
限定检索结果为主要主题词。
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建立检索式
如果有多个主题词, 可以先分别对每个主题词进行检索, 再在高级检索的Search History中用检索 序号进行布尔逻辑运算; 也可以通过主题词检索页面的PubMed search 直接建立检索式
形变异词。 ▪ 截词功能只限于单词,对词组无效
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布尔检索
布尔运算符AND,OR,NOT必须大 写 从左至右进行布尔运算 以通过加圆括符改变运算顺序
英文数据库与英文文献检索通用课件

These databases combine elements of structured and unstructured databases They provide some structure for organizing information, but not as strictly as fully structured databases
English Database and English Literature Retrieval
2023
REPORTING
Overview of English databasesIntroduction to commonly used English databasesEnglish Literature Retrieval SkillsReading and organizing English literaturePractice of English Database and Literature RetrievalAdvanced English Database and Literature Retrieval
PART
03
English Literature Retrieval Skills
2023
REPORTING
Choosing the appropriate keywords
The selection of keywords is crucial for the search results. Choosing keywords that are relevant to the topic and representative can improve the accuracy and efficiency of retrieval.
PubMed检索原理及途径

PubMed检索原理及途径1. 检索原理PubMed具有自动转换匹配功能(Automatic Term Mapping)。
对于输入检索框中的检索词,将按照一定的顺序进行对照、匹配和转换,然后再进行检索。
其顺序是:MESH转换表、期刊刊名转换表、短语表、著者索引。
此外,还可进行短语检索,即将短语作为一个词组进行检索,可用双引号将其引起,此时系统不进行自动转换匹配,也不进行MeSH词的扩检。
2. 检索途径⑴基本检索PubMed的主界面有一个简单的提问词输入框及辅助工具栏,此外,其左侧栏还提供了几种检索功能:Journals Database , MeSH Database , Single Citation Matcher, Batch Citation Matcher, Clinical Queries, Special Queries, LinkOut, My NCBI (Cubby)。
在提问框输入自由词或检索表达式(可直接进行字段限定),点击go 即可进行自由词检索。
同样可结合辅助工具栏按钮,进一步检索。
Limits:限定检索。
PubMed限制内容较多,可对字段、出版类型、年龄、性别、语言、出版年限、收录进Entrez年限、是否具备摘要、检索范围等进行限制。
History:检索历史。
可自动将检索式及结果数量记录到History屏,结合#号进一步检索。
#号间可以用布尔逻辑符组佩检索,如#1 AND #2。
例:查找2004年以来的有关胎盘生长(placenta growth)和氧气(oxygen)的英文文献步骤:PubMed主页→点击limits,限定时间2004;语种为English→页面最下端点击go,在检索词输入框中,输入placenta gr owth AND oxygen→点击go→得到检索结果。
⑵主题词检索点击主页左侧栏MeSH Database,或从上面数据库PubMed下拉菜单中选中MeSH,即可进入MESH检索界面。
最新【英语六级】第一章医学文献检索概论课件ppt

(2)索引 以单篇文献为著录对象,系统揭示它们的名称、著 者和所在出版物的位置,并按一定的原则和方法编 排而成的检索工具。
❖ 新生儿窒息所引起的医疗纠纷及相关法律问题思考/ 喻观培等//中华实用中西医杂志.—2004(6), 916-918
(一)文献概论
❖ 文献--记录有知识的一切载体 ❖ 构成文献必须具备三个基本要素:知识,载体,记
录方式
1、文献的类型
❖ (1)以载体划分:
印刷型
以纸质材料为载体 以印刷为记录手段而形成的文献形式 是目前整个文献中的主体 也是有着悠久历史的传统文献形式
特点 不需要特殊设备 可以随身携带 随处随时阅读 但存贮密度小 体积大 占据空间大 不便于保存
如专利号、标准号、国际标准书号
❖ (2).从文献的内容特征进行检索的途径 ❖ ①分类途径:利用特定分类体系的分类号或分类类目作为检
索标识进行文献查检
《中国图书馆分类法》,将人类所有知识划分为22个基本 大类(一级类目),一级类目下分为二级类目,二级类目 下再分为三级类目……从一般到具体,越分越细 分类号:分类途径检索的标识
❖ 5、类书:辑录古代文献中的史实典故、诗赋或名物制度等原始资料, 按类或按韵编排,专供人们查找古代资料参考工具书。
❖ 6、表谱、图录:以列表形式提示有关知识内容的参考工具书称为表谱, 如《中国历史纪年表》,图录是一种以图形揭示事物形象,并配以文字 说明内容的参考工具书,人体解剖图谱、经络图、中草药图谱。
【英语六级】第一章医学 文献检索概论
导论
❖ 为什么要学习这门课程? ❖ 本课程能学到些什么? ❖ 怎样学好这门课程?
文献检索专业英文词汇课件

02
Literature retrieval technology
Boolean Search
Boolean Search technology is a common and effective information retrieval method, which is based on the development of computer technology and information retrieval theory
Topic search
Topic search technology can be applied to all fields of text data analysis, such as news, report, paper, etc
Topic search technology has the characteristics of subjectivity, complexity, and uncertainty
Cluster analysis
• Cluster analysis is a data analysis method, which provides data into different groups according to cancer rules or algorithms, and then analyzes the characteristics and patterns of each group
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Overview of Literature Retrieval
Definition of Literature Retrieval
Literature retrieval is an information retrieval technology that uses computer programs to search and retrieve relevant documents from a large corpus of text
第二讲 检索原理 (2)

五、主题语言:标题词语言
标题词语言:是最早出现的一种主题法类型。是以标题
词作为文献内容标识和检索依据的主题语言。 标题词:是从文献题目和内容中抽选出来,经过规范化 处理,用以描述文献内容特征的词,词组或短语。一般 分为主、副标题词。 1.标题词法的原理 是从科技人员熟悉的大量科技名词术语中,选出具 有实质性意义的科技名词术语,经过规范化处理,作为 标识,来直接表达文献所论及的事物──主题,而不管 该文献是从哪个角度,哪个学科来论述该事物主题的, 并将全部标识按字顺排列,而不管各个标识所表达的事 物──主题之间的关系。
自动设计 CAD CAM
......
2.体系分类法的结构
我国广泛使用的《中国图书馆图书分类法》简称《中图法》,就是一种典型 的体系分类法,它由编制说明,基本大类,简表,详表,辅表五个部分组成。 现以1999年出版的第四版《中图法》为例,说明体系分类法的结构。 (1)编制说明:包括该分类法的编制过程,所依据的编制原则、部类及 大类的设置和次序的理由,对各种分类问题的处理方法,标记方法,使用方 法等。 (2)基本大类:采用五个基本部类。即马克思、• 列宁主义毛泽东思想, 哲学,社会科学,自然科学,综合性图书。在此基础上组成了22个基本大类 (一级类目) (3)简表 由三级类目组成,是《中图法》的基本类目表,浏览简表可 以很快了解整个分类体系的概貌,归类查表时只有从简表入手查详表,才能 做到准确快速。 (4)详表 又叫主表,由类号、类目和注释组成。 (5)辅表 也叫复分表,• 用来对主表中所例举的类目进行细分,可分为 “通用复分表”和“专用复分表”。
索词,与它后台数据库中存储的文件关键词进行比 对,如果能够匹配,就认为这条信息是你需要的, 立刻输出给你。
文献检索pubmed讲解资料

PubMed基本检索
smith j
作者姓名检索 按照姓(全写) +名(缩写), 之间不用标点 键入作者姓名
PubMed基本检索
"smith j"[au]
精确检索避免 PubMed自动 词汇转换,实 现精确查找
PubMed基本检索
期刊检索
在检索框中键入期刊名,如:European journal of immunology,系统的“自动词语匹配”功能会将它转换成"Eur J Immunol"[Journal] OR "european journal of immunology"[All Fields]进行检索。
期刊数据库的作用: 1、可以查看期刊的详细信息,包括出版国家,出版社,出版语言, 期刊类目等等; 2、可以根据期刊的主题分类,查看medline收录的各学科的期刊, 比如查看medline收录的关于麻醉学(Anesthesiology)方面的期 刊; 2、方便检索某本期刊上被PubMed收录的所有文章。
• PubMed收录的期刊最早追溯至1865年,共收录了70余个国家
36000余种期刊,1900多万篇文献;
• PubMed 的子集Medline收录的文献最早追溯至1902年,现有
记录1790多万篇;
• 目前每年增加约60余万条文献记录; • 在全部记录中有76%的文献为英文;在2000年以来的记录中
提纲
• PubMed概况 • PubMed功能栏介绍 • 认识PubMed文献 • PubMed基本检索 • PubMed高级检索 • 主题词MeSH检索 • 循证及临床查询检索 • PubMed全文获取 • PubMed RSS学科跟踪
概况
外文文献检索教程ppt课件

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课题检索要点
9
关键词分析举例
先对课题进行分析
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出版来源
点击选择硕士论文
按年份检索
底部相关检索
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例如:搜索风险投资管理方面的文献,需要两个关键词,中间用并含
风险投资
管理
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课题
得到中文关键词
Key words
翻译
Key words
检索结果
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检索结果太少了?
去掉某方面要求; 放宽检索范围; 同义词及缩写形式; 使用单数单词检索; 使用通配符; ……
只检索药物上瘾方面的文章
时间放宽到1995年以来,不限定学 科领域
关键词可以出现在文章任何字段
增加drug addiction的同义词:drug dependence,therapy的同义词: treatment
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期刊覆盖的学科领域 (2011年)
• 农业和生物学 (182)
• 能源和动力 (55)
• 生物化学/遗传学/分子生物学 (253)• 工程和技术 (220)
• 商业、管理和会计学 (86)
• 环境科学 (110)
• 化学工程学 (95)
• 免疫学和微生物学 (104)
• 化学 (115)
• 材料科学 (141)
引文提示:某一篇文章又被新的文章所引用
期刊提示:关注的期刊出版了新的一期
主题提示:关注的主题有新的文章发表
历史追踪(检索历史与操作历史)
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个性化功能:最热门文章推荐
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See Chapter 1, 3one of the basic principles of a literature search. The basic principles of literature search through the literature search is actually a search tool to find the information they need. The principle Simply put, the question is to identify and retrieve those stored in a retrieval system identification literature to compare two identification documents contain the same or need to retrieve the identification, put the logo features a literature retrieval system from in output, the literature is the literature search initially hit. This includes storage and retrieval of documents, as shown.Comparison and selectionStored procedure: the retrieval process :Document Information Search topicAnalysis AnalysisDocument Information feature Information retrievalquestionsBibliographic indexing ExpressionCharacterizationExpressInfor matioCharacteriz ationExpressInformation collectionSearch Results(Perfectly matched, related, unrelated) 2.Information storage and retrieval 1)information storageretrieval booksAbstract number: 020001Title: the dye in production of the microcomputer control Author: zhang Ming; Chien-ming wang; LiuJianYeInstitution: Beijing institute of chemical (Beijing 100001) Literature sources (source) : chemical technology, 2002.33 (6) 32-36Abstract: in this paper the dye production process in the microcomputer control, temperature control technology of application.Key words: the dye production microcomputer feeding control temperature controlClassified number: TQ7 TP3Literature characteristics, search fields, retrieval item: the title, author, institutions, literature sources, abstract, key words, classificationdatabaseDN--02174618AN--ETI – IMPRIVING LIGHT – METAL CASTINGS.AU – Vaccari , John A.CS –American Machinist & Automated Manufacturing, New York, NY USASO – Am Mach Autom Manuf v 130 n 6 Jun 1986 p 87 –89PY -- 1986SN – 0886-0335LA -- ENGLISHDT -- JA^(Journal Article)TC -- A^(Applications)AB –With high –strength aluminum-and magnesium - casting alloys having reached the limit of their mechanical performance by conventional …. ^5 refs.DE -- ALUMINUM AND ALLOYS – CastingID --^FOUNDRY PRACTICE - Permanent MouldCC -- 541 (Aluminum & Alloys) ^534 (Foundry Practice)2) information retrievalA; Appearance characteristics1. The title (title, the title, literature title) indexIn the production of dyes microcomputer control-0200012. The authors indexZhang Ming-020001Chien-ming wang see: zhang MingLiuJianYe see: zhang MingFamily name * in former name last3. Institutions indexBeijing institute of chemical-0200014. Literature number (registration number, ISSN number,the patent number, the number of report)B; Content features1. The theme indexThe dye production--02001 02 * * * * * * * * * *Microcomputer-02001 02 * * * * * * * * * *Feeding control--02001 02 * * * * *Temperature control--02001 02 * * * * *2. Classification indexTQ7 chemical industry02001 02 * * * * *TP3 automatic control02001 02 *****Computer search:1. Field retrieval: title, key words, the full text,, authors, institutions, the title, s, WenZhong, etc2. Simple retrieval: field, classification, subject3. Advanced retrieval: retrieval modelExample: S1. Dyestuff production AND (computer ORcomputers OR computer) AND melky charging AND temperature AND controlS2. (zhang Ming OR chien-ming wang OR LiuJianYe) / AU AND Beijing institute of chemical/CSS3. S1 AND S2 Search topic: the application of computer in dyestuff production to retrieval?Literature characteristics, search fields, retrieval item: the title, author, institutions, literature sources, abstract, key words, classification3. Retrieval languageRetrieval language is in the field of literature retrieval people used to describe literature theme (content) characteristics or external characteristics and the questions of the information a special language. Because it is marking the language of literature characteristics, can also be called indexing language, because it is the index of language, can also be called as the index language.1) retrieval language in the literature retrieval in the roleIn the literature retrieval of the storage and retrieval process, retrieval language plays animportant role in language communication, is the literature guarantee storage and retrieval two process, indexing and retrieval personnel both sides thought personnel of the bridge. If no retrieval language as indexing and retrieval of staff personnel common language, it will be difficult to make indexing of literature of the contents of the personnel express (indexing terms) and retrieval personnel to the same content to express the literature (retrieval language) agree, literature retrieval it cannot.For example, the computer, the computer, the computerConcrete, concrete, cementSo retrieval language is essentially indexing and retrieval of the agreement between language. Use retrieval tools must master the retrieval ?Self-taught contentSecond, literature retrieval procedureLiterature retrieval we have the following five program (step) :Analysis and research topic selection retrieval tools-sure way to search for clues to the literature retrieval, and ask for the original documents.1. Analysis research subject analysis to find the literature research is the most basic preparation before, to the retrieval process and retrieval effect has the crucial influence function. It includes:1) analysis of the main content of the research project, which subject, etc, to determine the subject keywords, relevant keywords and specialized subject range (a secondary classification mesh name and related categories name) retrieval marking.2) according to the subject for property analysis found mainly in literature in what publications, so as to determine the types of literature retrieval.3) according to the subject1) books Example:Computer simulation of electronic circuits①R, Raghuram ②, NeW Delhi, India: Weiley③(1989)④246pp⑤,ISBN :8122401112⑥Note: (1) the title; (2) the authors; (3) of publication, the publisher; (4) the publication date; The total number of pages;(5) 6 international standard book number < ISBN number >.2) journal Example:J Pressure Vessel Technol. Trans, ASME①V112 n.4②Nov. 1990③P410~416④Note: (1) the abbreviation; the title (2) the time; the roll(3) the monthly publication; (4) : page number.3) the meeting literature例:Proceedings Fourth AnnualSymposium on Logic in Computer Science ①(Cat. No. 89 CH2753-2)②Paific Grove, CA. USA, 5-8June 1989③(Washington, Dc, USA :IEEE Computer, Soc press 1989 P263-72)④Note: (1) the meeting and conference record the name; (2) the order number; (3) the meeting place and time; (4) the meeting record the publisher, address and publication date and the pagenumber.Usually, the Meeting in the literature have a Meeting in the characteristics, such as Proceedings, Symposium, Conference, Meeting, according to these features to determine whether theMeeting of the literature.4) the patent documentExample: Patent no: US 4202737Note: the Patent number is the United States code, US, the Patent document has "Patent" the network.5) technical reportExample: the Report KFKI-1983-57 (1), Hungarian Acad, Sci., Budapest (2), 1983 () (3) (4), 15 ppNote: (1) the technical report Numbers; (2) collect and compile technical report agencies address; (3) the time; announced (4)report pages. Technical Report has "Report" the network.6) degree thesisExample: j. a. George, (1) the "Computer Implementation of the Finite Element Method", (2) Ph. D. Dissertation (3), StanfordUniv俄文字母-拉丁字母音译对照表(1) in the YuWei can be omitted when.Four, Chinese retrieval tools (printed)1 situationChina science and technology literature retrievaltools to establish the system of experience, we have from scratch, from a translation from printing wrote, to the process of development of the database.The publication of the retrieval tools in China through decades of hard work, gradually layout automation, index WanShanHua, carrier to the direction of the diversification. In general, our country retrieval toolhas the following features:1) published in Chinese, domestic readers languagebarriers, without reading speed.2) system and structure step by step, standardization and normalization of the retrieval tools for the reader master the use method and sharing the document resourcesprovided convenience.3) morphological diversity. In recent years, more andmore domestic information processing orgnaizationcalculated by using the ?。