TAILIEUCHUNG - Fiber Optics Illustrated Dictionary - Part 39

The Fiber Optics Illustrated Dictionary - Part 39 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 of force in a magnetic field taken as a group symb. -B . When expressed in terms of density per unit area it is called flux density symb. - D . fly-by n. A representation of movement from a point of view above the ground commonly used in animations especially video games with flight simulation. Fly-by animations give a wonderful sense of being inside the scene that is imaged. NASA has produced some wonderful fly-by animations of the surfaces of otherplanets such as Mars. Satellite geophysical data make it possible to create fly-bys of Earth s surface right down to individual buildings and streets. Virtual reality fly-by simulations are startlingly real with participants ducking moving images so as not to be hit. See virtual reality. fly-page See banner. flyback retrace. In a cathode-ray tube CRT the movement of the electron beam tracing the image on the screen from the end of the trace to the beginning where it starts over on the next line. Flyback is usually associated with a blanking interval in which the beam is turned off so as not to interfere with the image already displayed. There is more than one type of flyback on a monitor. The flyback associated with scanning each line is similar to the line feed and carriage remm on a typewriter in that the scan finishes at the end of one line and flies back to the next line down or two lines down in interlaced screens and the beginning of the subsequent line in a zigzag sawtooth pattern. The other type of flyback is when the full video frame is finished the beam is at the bottom or last line of the screen and then flies back to the top or first line of the screen. This example assumes a typical CRT in which the scanning is left to right and top to bottom. See blanking frame. flying erase head A mechanism on prosumer and industrial level VCRs and camcorders that erases previously recorded video traces that might otherwise interfere with new information being recorded on top of the .

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