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Dolos
A dolos (plural: dolosse) is a wave-dissipating concrete block used in great numbers as a form of coastal management. It is a type of tetrapod. Weighing up to , dolosse are used to build revetments for protection against the erosive force of waves from a body of water. The dolos was invented in 1963, and was first deployed in 1964 on the breakwater of East London, a South African port city. Construction Dolosse are normally made from un-reinforced concrete, poured into a steel mould. The concrete will sometimes be mixed with small steel fibers to strengthen it in the absence of reinforcement. They are used to protect harbour walls, breakwaters and shore earthworks. In Dania Beach, Florida, dolosse are used as an artificial reef known as the Dania Beach Erojacks. They are also used to trap sea-sand to prevent erosion. An order of 10,000 dolosse are required for a kilometre of coastline. They work by dissipating, rather than blocking, the energy of waves. Their design de ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dolos
A dolos (plural: dolosse) is a wave-dissipating concrete block used in great numbers as a form of coastal management. It is a type of tetrapod. Weighing up to , dolosse are used to build revetments for protection against the erosive force of waves from a body of water. The dolos was invented in 1963, and was first deployed in 1964 on the breakwater of East London, a South African port city. Construction Dolosse are normally made from un-reinforced concrete, poured into a steel mould. The concrete will sometimes be mixed with small steel fibers to strengthen it in the absence of reinforcement. They are used to protect harbour walls, breakwaters and shore earthworks. In Dania Beach, Florida, dolosse are used as an artificial reef known as the Dania Beach Erojacks. They are also used to trap sea-sand to prevent erosion. An order of 10,000 dolosse are required for a kilometre of coastline. They work by dissipating, rather than blocking, the energy of waves. Their design de ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aubrey Kruger
Aubrey Kruger (21 July 1935 – 19 July 2016) was a South African draughtsman and inventor. Working life He worked as a draughtsman for the South African Railways and Harbours Administration in East London, Eastern Cape, until 1966. He was then transferred to Durban. In 1973 he moved to East London, Eastern Cape and started a tyre retreading company. In his later years he worked as a draughtsman for an architectural company. After that he became a truss designer for a timber company. Invention Eric Mowbray Merrifield is credited for the invention of the "Dolos", a concrete block used to stop coastal erosion. However, Kruger countered that claim by claiming that he was the inventor of the "Dolos" and that he had done so in 1963 after being instructed by the South African Railways and Harbours Administration The South African Railways and Harbours Administration (SAR&H) was established on 31 May 1910 with formation of the Union of South Africa by the amalgamation of the four ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Log Jam
A log jam is a naturally occurring phenomenon characterized by a dense accumulation of tree trunks and pieces of large wood across a vast section of a river, stream, or lake. ("Large wood" is commonly defined as pieces of wood more than in diameter and more than long) Log jams in rivers and streams often span the entirety of the water's surface from Bank (geography), bank to bank. Log jams form when trees floating in the water become entangled with other trees floating in the water, or become snagged on rocks, large woody debris, or other objects anchored underwater. They can build up slowly over months or years, or they can happen instantaneously when large numbers of trees are swept into the water after natural disasters. A notable example caused by a natural disaster is the log jam that occurred in Spirit Lake (Washington)#Mount St. Helens eruption, Spirit Lake following a landslide triggered by the 1980 eruption of Mount St. Helens, eruption of Mount St. Helens. Until they ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jacks Matatenas Color
Jacks may refer to: * Knucklebones, a game of ancient origin, also known as "jacks" * Jacks (band), a 1960s Japanese psychedelic rock band * Jacks Mountain, a ridge in Pennsylvania, United States * Jacks River, a river in the Cohutta Wilderness Area, Georgia, United States * Jack's, a fast food restaurant chain in the United States * Jack's, a value retail chain in the United Kingdom, part of the Tesco Group * South Dakota State Jackrabbits, the athletic program of South Dakota State University People with the surname * Al Jacks (born c. 1935), American professor and college football coach * Banita Jacks, American convicted murderer * Brian Jacks (born 1946), British judoka * Digby Jacks (1945–2011), British trade union official * George Jacks (born 1946), English association football player * Harry Jacks (1908–1994), New Zealand soldier, plant pathologist, lecturer and forester * James Jacks (1947–2014), American film producer * Katrina Jacks (1986–2010), Welsh r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
South African Railways And Harbours Administration
The South African Railways and Harbours Administration (SAR&H) was established on 31 May 1910 with formation of the Union of South Africa by the amalgamation of the four colonial railways and all harbours in South Africa - about 11,000 kilometres of track. It would manage road transport and pipelines in South Africa. It also managed South African Airways from 1934 to 1997. It was reorganised and renamed in 1981 as the South African Transport Services (SATS). In 1990 it became Transnet. History Prior to the creation of the Union of South Africa on 31 May 1910, South Africa consisted of four colonies of the Cape, Orange River, Natal and Transvaal. The formation of the union resulted in the railways and harbours of the colonies being amalgamated under one organisation. The Central South African Railways, the Cape Government Railways, and the Natal Government Railways were all fused by an Act of Parliament. The South African Railways and Harbours Service Act, 1912 made striking by railwa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Associated Science And Technology Societies Of South Africa
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Associated may refer to: *Associated, former name of Avon, Contra Costa County, California * Associated Hebrew Schools of Toronto, a school in Canada *Associated Newspapers, former name of DMG Media, a British publishing company See also *Association (other) *Associate (other) Associate may refer to: Academics * Associate degree, a two-year educational degree in the United States, and some areas of Canada * Associate professor, an academic rank at a college or university * Technical associate or Senmonshi, a Japa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shell Design Award
Shell may refer to: Architecture and design * Shell (structure), a thin structure ** Concrete shell, a thin shell of concrete, usually with no interior columns or exterior buttresses ** Thin-shell structure Science Biology * Seashell, a hard outer layer of a marine animal, found on beaches * Eggshell * Nutshell * Exoskeleton, an external covering of some animals ** Mollusc shell *** Bivalve shell *** Gastropod shell ** Shell, of a brachiopod ** Turtle shell Physics and chemistry * Electron shell or a principal energy level of electrons outside an atom's nucleus * Nuclear shell model, a principal energy level of nucleons within an atom's nucleus * On shell and off shell, quantum field theory concepts depending on whether classical equations of motion are obeyed Mathematics * Spherical shell Organisations * Shell plc, a British multinational oil and gas company ** Shell USA ** Shell Australia ** Shell Canada ** Shell Nigeria * Shell corporation, a type of company that serve ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Knucklebones
Knucklebones, also known as scatter jacks, snobs, astragalus, tali, dibs, fivestones, jacks, or jackstones, among many other names, is a game of dexterity played with a number of small objects that are thrown up, caught, and manipulated in various manners. It is ancient in origin and is found in various cultures worldwide. The name "knucklebones" is derived from the Ancient Greek version of the game, which uses the astragalus (a bone in the ankle, or hock) of a sheep. However, different variants of the game from various cultures use other objects, including stones, seashells, seeds, and cubes. Modern knucklebones consist of six points, or knobs, projecting from a common base and are usually made of metal or plastic. The winner is the first player to successfully complete a prescribed series of throws, which, though similar, differ widely in detail. The simplest throw consists in either tossing up one stone, the jack, or bouncing a ball and picking up one or more stones or kn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eric Mowbray Merrifield
The given name Eric, Erich, Erikk, Erik, Erick, or Eirik is derived from the Old Norse name ''Eiríkr'' (or ''Eríkr'' in Old East Norse due to monophthongization). The first element, ''ei-'' may be derived from the older Proto-Norse ''* aina(z)'', meaning "one, alone, unique", ''as in the form'' ''Æ∆inrikr'' explicitly, but it could also be from ''* aiwa(z)'' "everlasting, eternity", as in the Gothic form ''Euric''. The second element ''- ríkr'' stems either from Proto-Germanic ''* ríks'' "king, ruler" (cf. Gothic ''reiks'') or the therefrom derived ''* ríkijaz'' "kingly, powerful, rich, prince"; from the common Proto-Indo-European root * h₃rḗǵs. The name is thus usually taken to mean "sole ruler, autocrat" or "eternal ruler, ever powerful". ''Eric'' used in the sense of a proper noun meaning "one ruler" may be the origin of ''Eriksgata'', and if so it would have meant "one ruler's journey". The tour was the medieval Swedish king's journey, when newly elected, to s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nature
Nature, in the broadest sense, is the physics, physical world or universe. "Nature" can refer to the phenomenon, phenomena of the physical world, and also to life in general. The study of nature is a large, if not the only, part of science. Although humans are part of nature, human activity is often understood as a separate category from other natural phenomena. The word ''nature'' is borrowed from the Old French ''nature'' and is derived from the Latin word ''natura'', or "essential qualities, innate disposition", and in ancient times, literally meant "birth". In ancient philosophy, ''natura'' is mostly used as the Latin translation of the Greek word ''physis'' (φύσις), which originally related to the intrinsic characteristics of plants, animals, and other features of the world to develop of their own accord. The concept of nature as a whole, the physical universe, is one of several expansions of the original notion; it began with certain core applications of the word ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Salmonids
Salmonidae is a family of ray-finned fish that constitutes the only currently extant family in the order Salmoniformes . It includes salmon (both Atlantic and Pacific species), trout (both ocean-going and landlocked), chars, freshwater whitefishes, graylings, taimens and lenoks, which are collectively known as the salmonids ("salmon-like fish"). The Atlantic salmon (''Salmo salar''), whose Latin name became that of its genus ''Salmo'', is also the source of the family and order names. Salmonids have a relatively primitive appearance among the teleost fish, with the pelvic fins being placed far back, and an adipose fin towards the rear of the back. They have slender bodies, with rounded scales and forked tails, and their mouths contain a single row of sharp teeth. Although the smallest species is just long as an adult, most are much larger, with the largest reaching . All salmonids spawn in fresh water of upper reaches of rivers and creeks, but in many cases, the fish ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Endangered Species Act
The Endangered Species Act of 1973 (ESA or "The Act"; 16 U.S.C. § 1531 et seq.) is the primary law in the United States for protecting imperiled species. Designed to protect critically imperiled species from extinction as a "consequence of economic growth and development untempered by adequate concern and conservation", the ESA was signed into law by President Richard Nixon on December 28, 1973. The Supreme Court of the United States described it as "the most comprehensive legislation for the preservation of endangered species enacted by any nation"."Tennessee Valley Authority v. Hill" 437 U.S. 153 (1978) Retrieved 24 November 2015. The purposes of the ESA are two-fold: to prevent extinction and to recover species to the point where the law's protections are not needed. It therefo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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