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Scirus Introduction
About Scirus

How does Scirus find Scientific Information?

How Does Scirus Help You Get Better Search Results?

What Content is Covered by Scirus?

How Does Scirus Rank Results?

Why Use Scirus Ahead Of Other Search Engines?

About the name Scirus
Scirus is the most comprehensive science-specific search engine available on the Internet. Driven by the latest search engine technology, it enables scientists, students and anyone searching for scientific information to chart and pinpoint data, locate university sites and find reports and articles quickly and easily. It was launched by Elsevier Science, the leading international publisher of scientific information.

Locating scientific information on the web is easy with Scirus because it:

• Focuses only on web sites containing scientific content - quickly pinpointing key data by targeting sites that conventional search engines cannot find, such as university Web sites and author homepages.
• Searches both free and journal sources - saving you time by covering over 105 million science-related pages, consisting of 90 million Web pages, as well as 17 million records from sources such as ScienceDirect, IDEAL, MEDLINE on BioMedNet, Beilstein on ChemWeb, Neuroscion, BioMed Central, US Patent Office, E-Print ArXiv, Chemistry Preprint Server, Mathematics Preprint Server, CogPrints and NASA.
• Locates peer-reviewed articles - ensuring you do not miss out on this critical information source by finding more peer-reviewed articles than any other search engine.
• Delves deep into Web sites - revealing valuable information by digging far deeper than most search engine 'spiders' or 'crawlers' and indexing complete documents.
• Reads non-text files - allowing you to locate vital PDF and PostScript files that so often are invisible to other search engines.

How Does Scirus Help You Get Better Search Results?

Scirus has a wide range of special features that help you find the information you are after, quickly and accurately.

You can: • Select from a huge range of searchable subject areas
• Search within information types and information sources
• Locate data within a specified date range
• Find scientific conferences, abstracts and patents
• Refine customize and save your searches

Scirus is very user-friendly and extremely easy-to-navigate, thanks to a clean, smart design.

What Content is Covered by Scirus?

Scirus returns results from the whole Worldwide Web, including access-controlled sites. It currently covers 90 million science-related Web pages, including:
• 43 million .edu sites
• 5.8 million .org sites
• 5.7 million sites
• 4.5 million .com sites
• 2.0 million .gov sites

In addition to Web pages, Scirus indexes the following journal sources:

• 12.8 million MEDLINE citations
• 1.6 million ScienceDirect full-text articles
• 900,000 patents from the USPTO
• 657,000 Beilstein abstracts
• 248,000 IDEAL full-text articles
• 197,000 e-prints on E-Print ArXiv
• 10,310 NASA technical reports
• 1,410 e-prints on CogPrints
• 820 BioMed Central full text articles
• 565 preprints from the Mathematics Preprint Server
• 565 Neuroscion news items
• 465 preprints from the Chemistry Preprint Server

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.

Why Use Scirus Ahead Of Other Search Engines?

If you are searching for scientific content, Scirus offers an advantage over other search engines, like Google, because it:

• Filters out non-scientific sites. For example, if you search on Dolly, Google finds Dolly Parton, Scirus finds the cloned sheep.
• Finds peer-reviewed articles from access-controlled databases. For example, if you search on mad cow disease, Scirus finds peer-reviewed articles from ScienceDirect, Google finds Web pages only.
• Searches deeper than the first two levels of a Web site, thereby revealing much more relevant information.

About the name Scirus

We took the name Scirus from the following passage:

"To the Eleusinians who were warring against Erechtheus, came a man, Scirus by name, who was a seer from Dodona, and who also established at Phalerum the ancient temple of Athena Sciras. After he had fallen in the battle, the Eleusinians buried him near a winter-flowing river and the name of the region and the river is from that of the hero."*

We chose the name Scirus because seers and prophets are said to judge the signs of what is to come. And science is a visionary discipline in which you are continuously working on new ideas and developments. The Scirus search engine will pro-actively support your role as a seer.

*Excerpt from "The Description of Greece" by Pausanias, translated by August A. Imholtz, Jr., CIS Executive Editor

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