Đang chuẩn bị nút TẢI XUỐNG, xin hãy chờ
Tải xuống
The Fiber Optics Illustrated Dictionary - Part 53 fills a gap in the literature by providing instructors, hobbyists, and top-level engineers with an accessible, current reference. From the author of the best-selling Telecommunications Illustrated Dictionary, this comprehensive reference includes fundamental physics, basic technical information for fiber splicing, installation, maintenance, and repair, and follow-up information for communications and other professionals using fiber optic components. Well-balanced, well-researched, and extensively cross-referenced, it also includes hundreds of photographs, charts, and diagrams that clarify the more complex ideas and put simpler ideas into their applications context | Fiber Optics Illustrated Dictionary be conducting by electrochemical means assuming the solution is one that contains a compound that can be made conducting. ionization current A current resulting when an applied electric field influences the movement of electrical charges within an ionized medium. ionoscope A camera tube that incorporates an electron beam and a photoemitting screen where each cell in the screen s mosaic produces a charge. This charge or electric current is proportional to the variations of the light intensity in the image captured. The ionoscope produced the television image which was then transmitted to the kinescope for viewing in the days of live broadcasts. Sometimes known by the general use and older trademarked term iconoscope. See kinescope. ionosphere 1. A series of layers of ionized gases enveloping the Earth the most dense regions of which extend from about 60 to 500 km this varies with temperature and time of day . 2. The portion of the Earth s outer atmosphere which possesses sufficient ions and electrons to affect the propagation of radio waves. In this region the sun s ultraviolet rays ionize gases to produce free electrons without these ionized particles transmitted radio waves would continue out into space without bouncing back. The deflected path of a radio transmission is effected by the direction of the waves and the density of the ion layers it encounters. See ionosphere sublayers radio waves. ionosphere celestial A region around a celestial body comparable in ionic properties with the Earth s ionosphere. ionospheric sublayers subregions The Earth s ionosphere has generally been classified into a number of named regions each of which has properties that make it somewhat distinct from others. These regions are largely hypothetical models as they may change with the time of day or other factors and don t really form distinct layers as might be implied by the following chart. Nevertheless the distinctions are useful as a basis for
