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Napole
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PostSubject: definition   Tue Dec 05, 2006 6:32 pm

1. Impact factor

Impact factor, called IF, is a measure of the citations to science and social science journals. It is frequently used as a proxy for the importance of a journal to its field





Journal Impact Factor is from Journal Citation Report (JCR), a product of Thomson ISI (Institute for Scientific Information).

It is a measure of the frequency with which the "average article" in a journal has been cited in a particular year.

It is calculated by dividing the number of current citations to articles published in the two previous years by the total number of articles published in the two previous years.

It will help you evaluate a journalís relative importance, especially when you compare it to others in the same field.





2. Boolean operators

Boolean operators are used to construct more complex searches in a database. They help make a search more accurate. There are 3 operators: AND, OR and NOT.

3. Truncation

A method of shortening a search term to enable retrieval on variants of the same term, eg. using the search term "econom" in conjunction with an appropriate truncation symbol (such as *, ?, or $) will retrieve material containing the words "economy, economies, economic, economical".





Certain symbols, often * or ?, may be used in some search systems as wildcards to signify one or more characters.



Their use is most frequently permitted only for truncation at the end of a search term.

e.g. sul*ur will retrieve both sulfur and sulphur , while sulph* will retrieve sulphuric, sulphurous, sulphate, sulphite, etc, but not sulfuric, sulfurous, sulfate, sulfite, etc.



Truncation can result in too many irrelevant retrievals.

e.g., the truncated term diet* will retrieve documents containing the words diet, dietary, dietetic, dietician, but also any references to diethyl compounds.







4. cited references

Cited references present a list of records cited in your original articles.

5. stop words

Common words or characters that are ignored by the search engine, as they tend to slow down searches without improving the quality of the results. Stop words are reported as part of the query report.

6. open access

Also called open panel, allows participant to see another participating service provider without a referral.

Resources that are openly available to users with no requirements for authentication or payment.

7. MesH

MesH is the National Library of Medicinesí Controlled vocabulary thesaurus. It consists of sets of terms naming descriptors in a hierarchical structure that permits searching at various levels of specific. ( similar to the dictionary)

8. field codes / Field Tags

2 characters abbreviations. Use field codes to create a search using index fields referenced in either the citation or full display. Field coders are database specific.
9. search engine

A tool or program which allows keyword searching for relevant sites or information on the Internet. General and topic-specific search engines are prevalent today, for example, Education World, WebCrawler, Infoseek, Lycos, and Yahoo are examples of search engines

10. web directory

A web directory is a directory on the World Wide Web that specializes in linking to other web sites and categorizing those links. Web directories often allow site owners to submit their site for inclusion. editors review submissions for fitness

11. search terms

The words (or phrase) a searcher enters into a search engine's search box. Also used to refer to the terms a search engine marketer hopes a particular page will be found for. Also called keywords, query terms or query.

12. search expression

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