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  2. Thermoelectric generator - Wikipedia

    en.wikipedia.org/wiki/Thermoelectric_generator

    The typical efficiency of TEGs is around 5–8%, although it can be higher. Older devices used bimetallic junctions and were bulky. More recent devices use highly doped semiconductors made from bismuth telluride (Bi 2 Te 3), lead telluride (PbTe), [10] calcium manganese oxide (Ca 2 Mn 3 O 8), [11] [12] or combinations thereof, [13] depending on application temperature.

  3. Google Scholar - Wikipedia

    en.wikipedia.org/wiki/Google_Scholar

    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 ...

  4. Oxygen concentrator - Wikipedia

    en.wikipedia.org/wiki/Oxygen_concentrator

    The term oxygen generator is a misnomer in that the oxygen is not generated as it is with a chemical oxygen generator, but rather it is concentrated from the air. Non-medical oxygen concentrators can be used as feed gas to a medical oxygen system, such as the oxygen system in a hospital, though governmental approval is required, such as by the ...

  5. Eric Schmidt - Wikipedia

    en.wikipedia.org/wiki/Eric_Schmidt

    Schmidt was born in Falls Church, Virginia, later moving to Blacksburg, Virginia. [5] [22] He is one of three sons of Eleanor, who had a master's degree in psychology, and Wilson Emerson Schmidt, a professor of international economics at Virginia Tech and Johns Hopkins University, who worked at the U.S. Treasury Department during the Nixon Administration.

  6. Side project time - Wikipedia

    en.wikipedia.org/wiki/Side_project_time

    Within Google, this initiative became known as the "20% Project." [5] Employees were encouraged to spend up to 20 percent of their paid work time pursuing personal projects. The objective of the program was to inspire innovation in participating employees and ultimately increase company potential. Google's 20% Project was influenced by 3M's ...

  7. Wind turbine - Wikipedia

    en.wikipedia.org/wiki/Wind_turbine

    Thorntonbank Wind Farm, using 5 MW turbines REpower 5M in the North Sea off the coast of Belgium A wind turbine is a device that converts the kinetic energy of wind into electrical energy . As of 2020 [update] , hundreds of thousands of large turbines , in installations known as wind farms , were generating over 650 gigawatts of power, with 60 ...

  8. Stonehenge - Wikipedia

    en.wikipedia.org/wiki/Stonehenge

    Stonehenge is a prehistoric megalithic structure on Salisbury Plain in Wiltshire, England, two miles (3 km) west of Amesbury.It consists of an outer ring of vertical sarsen standing stones, each around 13 feet (4.0 m) high, seven feet (2.1 m) wide, and weighing around 25 tons, topped by connecting horizontal lintel stones, held in place with mortise and tenon joints, a feature unique among ...

  9. T20 medium tank - Wikipedia

    en.wikipedia.org/wiki/T20_Medium_Tank

    The T22E1 was the T22 pilot vehicle re-equipped with the turret originally built for the T20E1. The 75 mm automatic gun was tested in this installation and gave a maximum rate of fire of 20 rounds a minute, but was abandoned in December 1944 on the basis that it was unreliable and larger calibre guns were now the priority.

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