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A Barker code or Barker sequence is a finite sequence of N values of +1 and −1, with the ideal autocorrelation property, such that the off-peak (non-cyclic) autocorrelation coefficients. are as small as possible: for all . [1] Only nine Barker sequences [6] are known, all of length N at most 13. [7] Barker 's 1953 paper asked for sequences ...
t. e. The British Premonitions Bureau was formed in 1966 by psychiatrist John Barker after the Aberfan mining disaster in which 144 people, including 116 children, died when 500,000 tons of debris smashed through the Welsh town and buried the primary school. Reports of precognitive dreams foretelling of the catastrophe prompted Barker to form ...
Role-playing game, fantasy, science fantasy, science fiction. Empire of the Petal Throne is a fantasy role-playing game designed by M. A. R. Barker, based on his Tékumel fictional universe. It was self-published in 1974, then published by TSR, Inc. in 1975. It was one of the first tabletop role-playing games, along with Dungeons & Dragons, and ...
The heliospheric current sheet, or interplanetary current sheet, is a surface separating regions of the heliosphere where the interplanetary magnetic field points toward and away from the Sun. [1] A small electrical current with a current density of about 10 −10 A /m 2 flows within this surface, forming a current sheet confined to this ...
Tékumel. Tékumel is a fantasy world created by American linguist and writer M. A. R. Barker over the course of several decades from around 1940. [1] In this imaginary world, huge, tradition-bound empires with medieval levels of technology vie for control using magic, large standing armies, and ancient technological devices. In time, Barker ...
Plywood. Softwood plywood made from spruce. The principle of making plywood. Plywood is a composite material manufactured from thin layers, or "plies", of wood veneer that have been stacked and glued together. It is an engineered wood from the family of manufactured boards, which include plywood, medium-density fibreboard (MDF), oriented strand ...
The triangle mate involves a queen, supported by a rook on the same file two squares away, delivering checkmate to a king that is either at the edge of the board or whose escape is blocked by a piece; the queen, rook, and king together form a triangular shape, hence the name of the mating pattern.
Isogrid. Isogrid is a type of partially hollowed-out structure formed usually from a single metal plate (or face sheet) with triangular integral stiffening ribs (often called stringers). It was patented by McDonnell Douglas (now part of Boeing). [1] It is extremely light and stiff. [2]
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