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half-wave track circuit

См. также в других словарях:

  • Wave (audience) — Stadium crowd performing the wave at the Confederations Cup 2005 in Frankfurt The wave (North American) or the Mexican wave (outside North America) is an example of metachronal rhythm achieved in a packed stadium when successive groups of… …   Wikipedia

  • Reflected-wave switching — is a signalling technique used in backplane computer buses such as PCI. A backplane computer bus is a type of multilayer printed circuit board that has at least one (almost) solid layer of copper called the ground plane, and at least one layer of …   Wikipedia

  • Audience wave — The wave ( British English: Mexican wave ; also stadium wave), is achieved in a packed stadium when successive groups of spectators briefly stand and raise their arms. Each spectator is required to rise at the same time as those straight in front …   Wikipedia

  • Long track speed skating — For related forms of competition, see Speed skating. Competitive speed skater Speed skating (also long track speed skating) is an Olympic sport where competitors are timed while crossing a set distance. It is also a sport for leisure. Sports such …   Wikipedia

  • Distributed element filter — Figure 1. A circuit featuring many of the f …   Wikipedia

  • radar — /ray dahr/, n. 1. Electronics. a device for determining the presence and location of an object by measuring the time for the echo of a radio wave to return from it and the direction from which it returns. 2. a means or sense of awareness or… …   Universalium

  • Level crossing — This article is about at grade intersections between railway and road. For where two rail lines cross, see level junction. For a type of nuclear receptor (RXR), see Retinoid X receptor. A level crossing at Chertsey, England, as the barriers rise …   Wikipedia

  • North American railroad signals — Main article: North American railway signaling Baltimore and Ohio Railroad Color Position Light bracket masts at Magnolia, West Virginia North American railroad signals generally fall into the category of multi headed electrically lit units… …   Wikipedia

  • History of radar — The history of radar starts with experiments by Heinrich Hertz in the late 19th century that showed that radio waves were reflected by metallic objects. This possibility was suggested in James Clerk Maxwell s seminal work on electromagnetism.… …   Wikipedia

  • Phased array — This article is about general theory and electromagnetic phased array. For the ultrasonic and medical imaging application, see phased array ultrasonics. In wave theory, a phased array is a group of antennas in which the relative phases of the… …   Wikipedia

  • Traffic Control — ➡ law enforcement * * * Introduction       supervision of the movement of people, goods, or vehicles to ensure efficiency and safety.       Traffic is the movement of people and goods from one location to another. The movement typically occurs… …   Universalium

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