reversal of polarity

См. также в других словарях:

• Reversal — can refer to: * Reversal film, a type of photographic film also known as slide or transparency film * Reversal of polarity * Sweep (grappling) in grappling, also known as a reversal *Reversal (film), a movie about wrestling * Reversal (options),… …   Wikipedia

• Geomagnetic reversal — Magnetic reversal redirects here. For switching of a magnet, see Magnetization reversal. Geomagnetic polarity during the late Cenozoic Era. Dark areas denote periods where the polarity matches today s polarity, light areas denote periods where… …   Wikipedia

• geomagnetic reversal — Alternation of the Earth s magnetic polarity. The Earth s internal magnetic field reverses, on average, about every 300,000 to 1 million years. This reversal is very sudden on a geologic time scale, apparently taking about 5,000 years. The time… …   Universalium

• Brunhes-Matuyama reversal — The Brunhes Matuyama Reversal was a geologic event, approximately 780,000 years ago, when the Earth s magnetic field last underwent reversal. The reversal occurred over several thousand years. The apparent duration at any particular location… …   Wikipedia

• Electrodialysis reversal — EDR desalination is an electrodialysis reversal desalination membrane process that has been commercially used since the early 1960s. An electric current migrates dissolved salt ions, including fluorides, nitrates and sulfates, through an… …   Wikipedia

• magnetic reversal — noun Any of several reversals in the polarity of the Earths magnetic field (such that a compass points South) that have happened over geologic time …   Wiktionary

• Umpolung — or polarity inversion in organic chemistry is the chemical modification of a functional group with the aim of the reversal of polarity of that group [cite journal | author = Seebach D. | title = Methods of Reactivity Umpolung | journal =… …   Wikipedia

• Chronozone — For articles dealing with the fundamentals of geologic chronology, see: Biostratigraphy#Concept of zone, chronology (geology), and geologic time scale e  h Units in geochronology and stratigraphy …   Wikipedia

• Chemorepulsion — is the directional movement of a cell away from a substance. Of the two directional varieties of chemotaxis, chemoattraction has been studied to a much greater extent. Only recently have the key components of the chemorepulsive pathway been… …   Wikipedia

• List of meteorology topics — This is a list of meteorology topics. The terms relate to meteorology, the interdisciplinary scientific study of the atmosphere that focuses on weather processes and forecasting. (see also: List of meteorological phenomena)AlphanumericTOC… …   Wikipedia

• overshoot — 1. Generally, any initial change, in response to a sudden step change in some factor, that is greater than the steady state response to the new level of that factor; common in systems in which inertia or a time lag in negative …   Medical dictionary