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Google Scholar is a freely accessible web search engine that indexes the full text or metadata of scholarly literature across an array of publishing formats and disciplines. . Released in beta in November 2004, the Google Scholar index includes peer-reviewed online academic journals and books, conference papers, theses and dissertations, preprints, abstracts, technical reports, and other ...
A PDF file is often a combination of vector graphics, text, and bitmap graphics. The basic types of content in a PDF are: Typeset text stored as content streams (i.e., not encoded in plain text ); Vector graphics for illustrations and designs that consist of shapes and lines;
Bartók assigned opus numbers to his works three times. He ended this practice with the Violin Sonata No. 1, Op. 21 in 1921, because of the difficulty of distinguishing between original works and ethnographic arrangements, and between major and minor works. Since his death, three attempts—two full and one partial—have been made at cataloguing.
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v. t. e. Z-Library (abbreviated as z-lib, formerly BookFinder) is a shadow library project for file-sharing access to scholarly journal articles, academic texts and general-interest books. It began as a mirror of Library Genesis, but has expanded dramatically. [ 7][ 8]
The stepped reckoner or Leibniz calculator was a mechanical calculator invented by the German mathematician Gottfried Wilhelm Leibniz (started in 1673, when he presented a wooden model to the Royal Society of London [ 2] and completed in 1694). [ 1] The name comes from the translation of the German term for its operating mechanism, Staffelwalze ...
A scientific calculator with more than 240 built-in functions, with 2 lines × 10 digits LCD. The finance-centric programmable calculator from the Voyager series introduced in the 1980s. The longest running product in the HP calculator line, it remains in production. Various models exist, the latest in 2008.
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.