approach zone
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Zone defense — is a type of defense, used in team sports, which is the alternative to man to man defense; instead of each player guarding a corresponding player on the other team, each defensive player is given an area known as a zone to cover. A zone defense… … Wikipedia
Zone blocking — is a technique in American football that is a simple and effective scheme for giving the quarterback time and protection while simultaneously creating lanes for running plays. In a zone blocking scheme, fleet footedness and athletic ability trump … Wikipedia
Zone of polarizing activity — (ZPA) The small group of mesenchyme cells in avian limb buds that is located at the posterior margin of the developing bud and that produces a substance, possibly retinoic acid, that provides positional information to the developing limb bud. It… … Wikipedia
Zone of Terror — is a short story by British author J. G. Ballard, written in 1960. The story was published in The Disaster Area , and later in .PlotThe two characters of the story are Larsen and Bayliss, employees of an unnamed electronics company. The story… … Wikipedia
Approach lighting system — The approach lighting system of Bremen Airport An approach lighting system, or ALS, is a lighting system installed on the approach end of an airport runway and consisting of a series of lightbars, strobe lights, or a combination of the two that… … Wikipedia
Zone system — The Zone System is a photographic technique for determining optimal film exposure and development, formulated by Ansel Adams and Fred Archer in 1941. The Zone System provides photographers with a systematic method of precisely defining the… … Wikipedia
zone melting — a process of purifying any of various metals and other materials, as germanium or silicon, by passing it in bar form through an induction coil. Also called zone refining. Cf. cage zone melting. [1955 60] * * * Any of a group of techniques used to … Universalium
Zone valve — A zone valve is a specific type of valve used to control the flow of water or steam in a hydronic heating or cooling system.In the interest of improving efficiency and occupant comfort, such systems are commonly divided up into multiple zones.… … Wikipedia
Zone calme — En Europe (au sens de la directive européenne sur la gestion du bruit), une Zone calme (« quiet areas » pour les anglophones) est dans l environnement (naturel, semi naturel ou urbain), ou dans une carte d exposition au bruit, une zone… … Wikipédia en Français
Zone of proximal development — The zone of proximal development ( зона ближайшего развития ), often abbreviated ZPD , is the difference between what a learner can do without help and what he or she can do with help. It is a concept developed by the Russian psychologist and… … Wikipedia
Instrument approach — Terminal procedures for an ILS approach in the United States. (The disclaimers shown in red in the illustration do not appear on the original approach plate.) For aircraft operating under instrument flight rules (IFR), an instrument approach or… … Wikipedia
