beam emission

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• Emission theory (vision) — Emission theory or extramission theory is the proposal that visual perception is accomplished by rays of light emitted by the eyes. This theory has been replaced by intromission theory, which is that visual perception is accomplished by rays of… …   Wikipedia

• beam — [n1] length of material used as support axle, bail, balk, bolster, boom, brace, cantilever, column, crossbar, crosspiece, girder, jamb, joist, lath, lintel, pile, piling, pillar, plank, pole, post, prop, rafter, reach, scaffolding, scantling,… …   New thesaurus

• Beam tetrode — The problem of secondary emission in the tetrode tube (valve) was solved by Philips/Mullard with the introduction of a suppressor grid to produce the pentode construction. Since Philips held a patent on this design, other manufacturers were keen… …   Wikipedia

• beam — I (New American Roget s College Thesaurus) v. shine, glow; smile. n. ray, gleam; joist, timber. See light, support. II (Roget s IV) n. 1. [A relatively long, stout bar] Syn. timber, brace, rafter, stringer, stud, two by four, scantling, strut,… …   English dictionary for students

• beam — 1. Any bar whose curvature changes under load; in dentistry, frequently used instead of “bar.” 2. A collimated emission of light or other radiation, such as an x ray b.. [O.H.G. Boum] Balkan b. SYN: Balkan frame. cantilever b. in dentistry, a b.… …   Medical dictionary

• Field electron emission — It is requested that a diagram or diagrams be included in this article to improve its quality. For more information, refer to discussion on this page and/or the listing at Wikipedia:Requested images. Field emission (FE) (also known as field… …   Wikipedia

• Particle-induced X-ray emission — or proton induced X ray emission (PIXE) is a technique used in the determining of the elemental make up of a material or sample. When a material is exposed to an ion beam, atomic interactions occur that give off EM radiation of wavelengths in the …   Wikipedia

• Particle-Induced X-ray Emission — or Proton Induced X ray Emission (PIXE) is a technique used in the determining of the elemental make up of a material or sample. When a material is exposed to an ion beam, atomic interactions occur that give off EM radiation of wavelengths in the …   Wikipedia

• Electron beam lithography — (often abbreviated as e beam lithography) is the practice of scanning a beam of electrons in a patterned fashion across a surface covered with a film (called the resist),cite book |last= McCord |first=M. A. |coauthors=M. J. Rooks |title=… …   Wikipedia

• Electron beam physical vapor deposition — or EBPVD is a form of physical vapor deposition in which a target anode is bombarded with an electron beam given off by a charged tungsten filament under high vacuum. The electron beam causes atoms from the target to transform into the gaseous… …   Wikipedia

• Field emission display — A field emission display (FED) is a display technology that incorporates flat panel display technology that uses large area field electron emission sources to provide electrons that strike colored phosphor to produce a color image as a electronic …   Wikipedia