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four quadrant detector

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  • Kelvin probe force microscope — Kelvin probe force microscopy ( KPFM ), also known as surface potential microscopy, is a noncontact variant of atomic force microscopy (AFM) that was [http://dns.ntu ccms.ntu.edu.tw/references/APPL PHYS LETT 58 2921 1991.pdf invented] in 1991.… …   Wikipedia

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  • Gilbert cell — In electronics, the Gilbert cell is an electronic multiplying mixer first described by Barrie Gilbert in 1968. The output current of the circuit is an accurate multiplication of the (differential) base currents of both inputs.A Gilbert cell can… …   Wikipedia

  • Railway electrification system — Railway electrification supplies electrical energy to railway locomotives and multiple units so they can operate without having a reciprocating engine of their own.CharacteristicsThe main advantage of electric traction is a higher power to weight …   Wikipedia

  • Coronagraph — A coronagraph is a telescopic attachment designed to block out the direct light from a star so that nearby objects – which otherwise would be hidden in the star s bright glare – can be resolved. Most coronagraphs are intended to view the corona… …   Wikipedia

  • Piezoelectricity — is the ability of some materials (notably crystals and certain ceramics, including bone) to generate an electric potentialPrinciples of Instrumental Analysis. 6th Edition, 2007. Skoog, Holler, and Crouch. Chapter 1, Sec. 1C 4, Pg. 9.] in response …   Wikipedia

  • Active optics — is a relatively new technology for reflecting telescopes developed in the 1980s, which has more recently enabled the construction of a generation of telescopes with 8 metre primary mirrors. Active optics works by actively adjusting the telescope… …   Wikipedia

  • Florida State University — Infobox University name = Florida State University motto = Vires, artes, mores (Latin) mottoeng =Strength, skill, character established =1851cite web|url=http://www.floridamemory.com/Timeline |title=State Library and Archives of Florida The… …   Wikipedia

  • Extreme ultraviolet Imaging Telescope — The Extreme ultraviolet Imaging Telescope (EIT) is an instrument on the SOHO spacecraft used to obtain high resolution images of the solar corona in the ultraviolet range. The EIT instrument is sensitive to light of four different wavelengths: 17 …   Wikipedia

  • Environmental scanning electron microscope — Wool fibers imaged in an ESEM by the use of two symmetrical plastic scintillating backscattered electron detectors …   Wikipedia

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