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Grab (tool)
A grab is a mechanical device with two or more jaws (sometime clamshell-shaped), used to pick things up or to capture things. Some types include: *Roundnose grab *Clamshell grab *Orange-peel grab **in Dutch and German they are called ''poliep grijpers/ Polypengreifer'' = " polyp grabs". There are different ways of open/close the grabs: *electro-hydraulic / diesel-hydraulic *mechanical by rope(s) (1-rope, 2-ropes, 3-ropes, 4-ropes) Grabs can be used for: *dredging *bulk handling (e.g. loading/unloading ships) *salvage (e.g. ship-wrecks, oil) *seabed sampling History The mechanical grab, specifically the clamshell grab,Donald Routledge Hill, "Mechanical Engineering in the Medieval Near East", ''Scientific American'', May 1991, p. 64-69 was invented by the Persian Banu Musa brothers and described in their ''Book of Ingenious Devices'' in the 9th century. It was an original innovation by the Banu Musa that does not appear in any earlier Greek works. The grab described by the Banu M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mechanical Device
A machine is a physical system using power to apply forces and control movement to perform an action. The term is commonly applied to artificial devices, such as those employing engines or motors, but also to natural biological macromolecules, such as molecular machines. Machines can be driven by animals and people, by natural forces such as wind and water, and by chemical, thermal, or electrical power, and include a system of mechanisms that shape the actuator input to achieve a specific application of output forces and movement. They can also include computers and sensors that monitor performance and plan movement, often called mechanical systems. Renaissance natural philosophers identified six simple machines which were the elementary devices that put a load into motion, and calculated the ratio of output force to input force, known today as mechanical advantage. Modern machines are complex systems that consist of structural elements, mechanisms and control components ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polyp (zoology)
A polyp in zoology is one of two forms found in the phylum Cnidaria, the other being the medusa. Polyps are roughly cylindrical in shape and elongated at the axis of the vase-shaped body. In solitary polyps, the aboral (opposite to oral) end is attached to the substrate by means of a disc-like holdfast called a pedal disc, while in colonies of polyps it is connected to other polyps, either directly or indirectly. The oral end contains the mouth, and is surrounded by a circlet of tentacles. Classes In the class Anthozoa, comprising the sea anemones and corals, the individual is always a polyp; in the class Hydrozoa, however, the individual may be either a polyp or a medusa, with most species undergoing a life cycle with both a polyp stage and a medusa stage. In class Scyphozoa, the medusa stage is dominant, and the polyp stage may or may not be present, depending on the family. In those scyphozoans that have the larval planula metamorphose into a polyp, the po ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Banu Musa
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Banu or BANU may refer to: * Banu (name) * Banu (Arabic), Arabic word for "the sons of" or "children of" * Banu (makeup artist), an Indian makeup artist * Banu Chichek, a character in the ''Book of Dede Korkut'' * Bulgarian Agrarian National Union, a political party Places * Banu, Iran (other), various places in Iran * Bannu or Banū City, in Khyber-Pakhtunkhwa, Pakistan * Banu, a village in the commune of Dumești, Iași, Romania * Banú, a village in County Wexford, Ireland See also * * Bangu (other) * Banhu, Chinese musical instrument * Bannu (other) *Banou, Burkina Faso *Bhanu (other) * Bianhu *Bonu (other) Benow or Bonu ( fa, بنو, link=no) may refer to various places in Iran: * Benow, Lamerd, Fars Province * Benow, Larestan, Fars Province * Banu, Khamir, Hormozgan Province * Bonu, Sistan and Baluchestan See also * Banu (other) * Be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Donald Routledge Hill
Donald Routledge Hill (6 August 1922 – 30 May 1994)D. A. King, “In Memoriam: Donald Routledge Hill (1922-1994)”, ''Arabic Sciences and Philosophy,'' Volume 5 / Issue 02 / September 1995, pp 297-302 was a British engineer and historian of science and technology best known for his translation of ''The Book of Knowledge of Ingenious Mechanical Devices'' of the Muslim engineer Ismail al-Jazari.Hill Donald(1993) Life and work Born in London, after secondary school Hill served in the British army, in the Royal Engineers from 1941 to 1946. Two years he served in the Eighth Army in North Africa until he was wounded in action in Italy. Back in England he studied Engineering at the London University, obtaining his engineering degree in 1949. In 1964 he obtained his M.Litt in Islamic History at the University of Durham, and in 1970 his PhD from the University of London. Late 1940s Hill started his career working for the Iraq Petroleum Company in Lebanon, Syria and Qatar. Back in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Springer Science+Business Media
Springer Science+Business Media, commonly known as Springer, is a German multinational publishing company of books, e-books and peer-reviewed journals in science, humanities, technical and medical (STM) publishing. Originally founded in 1842 in Berlin, it expanded internationally in the 1960s, and through mergers in the 1990s and a sale to venture capitalists it fused with Wolters Kluwer and eventually became part of Springer Nature in 2015. Springer has major offices in Berlin, Heidelberg, Dordrecht, and New York City. History Julius Springer founded Springer-Verlag in Berlin in 1842 and his son Ferdinand Springer grew it from a small firm of 4 employees into Germany's then second largest academic publisher with 65 staff in 1872.Chronology ". Springer Science+Business Media. In 1964, Springer expanded its business internationa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dredging
Dredging is the excavation of material from a water environment. Possible reasons for dredging include improving existing water features; reshaping land and water features to alter drainage, navigability, and commercial use; constructing dams, dikes, and other controls for streams and shorelines; and recovering valuable mineral deposits or marine life having commercial value. In all but a few situations the excavation is undertaken by a specialist floating plant, known as a dredger. Dredging is carried out in many different locations and for many different purposes, but the main objectives are usually to recover material of value or use, or to create a greater depth of water. Dredges have been classified as suction or mechanical. Dredging has significant environmental impacts: it can disturb marine sediments, leading to both short- and long-term water pollution, destroy important seabed ecosystems, and can release human-sourced toxins captured in the sediment. Descripti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
History Of Iran
The history of Iran is intertwined with the history of a larger region known as Greater Iran, comprising the area from Anatolia in the west to the borders of Ancient India and the Syr Darya in the east, and from the Caucasus and the Eurasian Steppe in the north to the Persian Gulf and the Gulf of Oman in the south. Central to this area is Iran, commonly known until the mid-20th century as Persia in the Western world. Iran is home to one of the world's oldest continuous major civilizations, with historical and urban settlements dating back to 7000 BC.People, "New evidence: modern civilization began in Iran", 10 Aug 2007 , retrieved 1 October 2007 The south-western and western part of the |
Book Of Ingenious Devices
The ''Book of Ingenious Devices'' (Arabic: كتاب الحيل ''Kitab al-Hiyal'', Persian: كتاب ترفندها ''Ketab tarfandha'', literally: "The Book of Tricks") is a large illustrated work on mechanical devices, including automata, published in 850 by the three brothers of Persian descent, known as the Banu Musa (Ahmad, Muhammad and Hasan bin Musa ibn Shakir) working at the House of Wisdom (''Bayt al-Hikma'') in Baghdad, Iraq, under the Abbasid Caliphate. The book described about one hundred devices and how to use them. Overview The book was commissioned by the Abbasid Caliph of Baghdad, also made by Al-Jazari, Abu Jafar al-Ma'mun ibn Harun (786–833), who instructed the Banu Musa to acquire all of the Hellenistic texts that had been preserved by monasteries and by scholars during the decline and fall of Roman civilization. The Banū Mūsā brothers invented a number of automata (automatic machines) and mechanical devices, and they described a hundred such devices i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bucket (machine Part)
A bucket (also called a scoop to qualify shallower designs of tools) is a specialized container attached to a machine, as compared to a bucket adapted for manual use by a human being. It is a bulk material handling component. The bucket has an inner volume as compared to other types of machine attachments like blades or shovels. The bucket could be attached to the lifting hook of a crane, at the end of the arm of an excavating machine, to the wires of a dragline excavator, to the arms of a power shovel or a tractor equipped with a backhoe loader or to a loader, or to a dredge. The name "bucket" may have been coined from buckets used in water wheels, or used in water turbines or in similar-looking devices. Purposes Buckets in mechanical engineering can have a distinct quality from the traditional bucket (pail) whose purpose is to contain things. Larger versions of this type of bucket equip bucket trucks to contain human beings, buckets in water-hauling systems in mines or, for ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tools
A tool is an object that can extend an individual's ability to modify features of the surrounding environment or help them accomplish a particular task. Although many animals use simple tools, only human beings, whose use of stone tools dates back hundreds of millennia, have been observed using tools to make other tools. Early human tools, made of such materials as stone, bone, and wood, were used for preparation of food, hunting, manufacture of weapons, and working of materials to produce clothing and useful artifacts. The development of metalworking made additional types of tools possible. Harnessing energy sources, such as animal power, wind, or steam, allowed increasingly complex tools to produce an even larger range of items, with the Industrial Revolution marking an inflection point in the use of tools. The introduction of widespread automation in the 19th and 20th centuries allowed tools to operate with minimal human supervision, further increasing the productivity of h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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