for scientific information only
About Scirus
Scirus is the most comprehensive science-specific search engine on the Internet. Driven by the latest search engine technology, Scirus searches over 200 million science-specific Web pages, enabling you to quickly:
? Pinpoint scientific, scholarly, technical and medical data on the Web.
? Find the latest reports, peer-reviewed articles, patents, pre prints and journals that other search engines miss.
? Offer unique functionalities designed for scientists and researchers.
Scirus has proved so successful at locating science-specific results on the Web that the Search Engine Watch Awards voted Scirus 'Best Specialty Search Engine' in 2001 and 2002 and 'Best Directory or Search Engine Website' WebAward from Web Marketing Association in 2004. More...
Why Use Scirus?
Search engines are all different in the Web sites they cover, and the way they classify these Web sites. Scirus, the search engine for science, focuses only on Web pages containing scientific content.
Searching more than 200 million science-related pages, Scirus helps you quickly locate scientific information on the Web:
? Filters out non-scientific sites. For example, if you search on REM, Google finds the rock group - Scirus finds information on sleep, among other things
? Finds peer-reviewed articles such as PDF and PostScript files, which are often invisible to other search engines.
? Searches the most comprehensive combination of web information, preprint servers, digital archives, repositories and patent and journal databases. Scirus goes deeper than the first two levels of a Web site, thereby revealing much more relevant information.
Pinpointing Scientific Information
Scirus has a wide range of special features to help you pinpoint the scientific information you need. With Scirus, you can:
? Select to search in a range of subject areas including health, life, physical and social sciences.
? Narrow your search to a particular author, journal or article.
? Restrict your results to a specified date range.
? Find scientific conferences, abstracts and patents.
? Refine, customize and save your searches.
More advanced features are available in the Scirus Advanced Search Menu.
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How Does Scirus Rank Results?
Search results in Scirus are, by default, ranked according to relevance. It is also possible to rank results by date. You can do this by clicking the Rank by date link on the Results Page.
Scirus uses an algorithm to calculate ranking by relevance. This ranking is determined by two basic values:
1. Words - the location and frequency of a search term within a result account for one half of the algorithm. This is known as static ranking.
2. Links - the number of links to a page account for the second half of the algorithm - the more often a page is referred to by other pages, the higher it is ranked. This is known as dynamic ranking. Overall ranking is the weighted sum of the static and dynamic rank values. Scirus does not use metatags, as these are subject to ranking-tweaking by users.
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The Technology Behind Scirus
For more information about the technology behind Scirus, and the advanced functionality Scirus offers, download our white paper.
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The Range of Scientific Content Scirus Covers
Scirus returns results from the whole Web, including access-controlled sites that other search engines don't index. Scirus currently covers over 200 million science-related Web pages, including:
? 59 million .edu sites
? 18 million .org sites
? 6.8 million sites
? 18.6 million .com sites
? 5 million .gov sites
? Over 50 million other relevant STM and University sites from around the world
In addition to Web pages, Scirus indexes the following special sources:
? 311,065 e-prints on
? 6,515 BioMed Central full-text articles
? 2,175 e-prints through Cogprints
? 1,500 documents via DiVa
? 28,510 full text articles from Project Euclid
? 56,310 full-text articles on Crystallography Journals Online
? 13 million patent data via LexisNexis
? 33,050 course ware from MIT OpenCourseWare
? 12,265 NASA technical reports
? 149,381 full-text theses and dissertations via NDLTD
? 15.2 million MEDLINE citations via PubMed
? 285,500 articles via PubMed Central
? 163,800 documents via RePEc
? 5.6 million ScienceDirect full-text articles
? 318,760 full-text journal articles on Scitation
? 7,300 articles via SIAM
? 2,080 documents via T-Space
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