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Ranking of query is one of the fundamental problems in information retrieval (IR), [1] the scientific/engineering discipline behind search engines. [2] Given a query q and a collection D of documents that match the query, the problem is to rank, that is, sort, the documents in D according to some criterion so that the "best" results appear early in the result list displayed to the user.
The main academic full-text databases are open archives or link-resolution services, although others operate under different models such as mirroring or hybrid publishers. Such services typically provide access to full text and full-text search, but also metadata about items for which no full text is available.
A search engine lists web pages on the Internet. This facilitates research by offering an immediate variety of applicable options. Possibly useful items on the results list include the source material or the electronic tools that a web site can provide, such as a dictionary, but the list itself, as a whole, can also indicate important information.
To search within a top-level domain or generic top-level domain, a "site" parameter can be added. For example: "Search topic" site:*.ro lists websites under the .ro generic top-level domain. Omitting results by adding a minus (-) sign and url addresses for unwanted sites can result in higher-relevance hits (or at least higher relevance hits per ...
Open-source desktop search tool for Unix/Linux GPL Google Desktop: Linux, Mac OS X, Windows: Integrates with the main Google search engine page. As of September 14, 2011, Google has discontinued this product. Freeware ISYS Search Software: Windows: ISYS:Desktop search software. Proprietary (14-day trial) KRunner: Linux: Locate32: Windows
Wikipedia entry for Google Patents.Google Patents is a search engine from Google that indexes patents and patent applications from the United States Patent and Trademark Office.
Searx ( / sɜːrks /; stylized as searX) is a free and open-source metasearch engine, [4] available under the GNU Affero General Public License version 3, with the aim of protecting the privacy of its users. [5] [6] [7] To this end, Searx does not share users' IP addresses or search history with the search engines from which it gathers results.
CiteSeer X [4] is a public search engine and digital library and repository for scientific and academic papers, primarily with a focus on computer and information science. [4] However, recently CiteSeer X has been expanding into other scholarly domains such as economics, physics and others. Released in 2008, it was loosely based on the previous ...