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Johan Van Veen
Johan van Veen ( Uithuizermeeden, 21 December 1893 – The Hague, 9 December 1959) was a Dutch hydraulic engineer. He is considered the father of the Delta Works. Education Johan van Veen was the fifth child of seven in a farming family. He was the brother of Marie van Veen, married to the artist Johan Dijkstra. In 1913, after high school graduation, he started his studies in Delft at the Technische Hoogeschool van Delft. He studied civil engineering. In 1919, he graduated as "ingenieur" (equivalent to M.Sc. in engineering). Provincial Water Authority Drenthe Van Veen worked as an engineer for the Drainage Department of the Provincial Water Authority of the Province of Drenthe. The task of this department was to develop plans to improve the drainage and road structure of the province. In turn, this would enlarge the agricultural yield and to transport the products in a more efficient way to the markets (in the western part of the Netherlands). During World War I, it became ev ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Uithuizermeeden
Uithuizermeeden is a village in the Netherlands, with a population of about 3,200 people. It is part of the municipality of Het Hogeland, close to the Wadden Sea. The most important points are the ''Meijster Toren'' and the ''Rensumaborg'' (dated 1700, not open for public). The Meijster Toren dated from the thirteenth century, but was rebuilt at the end of the 19th century in original style, after a fire destroyed it. It had a population of around 3,325 in January 2017. Uithuizermeeden was a separate municipality until 1979, when it became part of Hefshuizen Hefshuizen is a former municipality in the Dutch province of Groningen. Hefshuizen was created in 1979, in the merger of the former municipalities of Uithuizen and Uithuizermeeden. In 1990, Kantens, Usquert, and Warffum were added, and in 1992, t .... Gallery File:Kerk van Uithuizermeeden.jpg, Church of Uithuizermeeden. File:Uithuizermeeden van Meeuwen.JPG, Church and sculpture ''Fish'' by Jaap Meeuwen File:Rensumaborg.j ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hendrik Lorentz
Hendrik Antoon Lorentz (; 18 July 1853 – 4 February 1928) was a Dutch physicist who shared the 1902 Nobel Prize in Physics with Pieter Zeeman for the discovery and theoretical explanation of the Zeeman effect. He also derived the Lorentz transformation underpinning Albert Einstein's special theory of relativity, as well as the Lorentz force, which describes the combined electric and magnetic forces acting on a charged particle in an electromagnetic field. Lorentz was also responsible for the Lorentz oscillator model, a classical model used to describe the anomalous dispersion observed in dielectric materials when the driving frequency of the electric field was near the resonant frequency, resulting in abnormal refractive indices. According to the biography published by the Nobel Foundation, "It may well be said that Lorentz was regarded by all theoretical physicists as the world's leading spirit, who completed what was left unfinished by his predecessors and prepared ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Deltar
{{Short description, An analog computer The Deltar (''Delta Getij Analogon Rekenmachine'', Dutch for Delta Tide Analog Calculator) was an analog computer, used for the design and implementation of the Delta Works from 1960 until 1984. The computer was based on ideas of Johan van Veen; he also constructed the first prototypes used from 1944-1946. After his death in 1959 this work was continued by J.C. Schönfeld and C.M. Verhagen. The computer was designed and built in order to make the complicated calculations required to predict the effects of dams, dikes, and storm surge barriers on the tides in the estuaries of the rivers Rhine, Meuse and Scheldt. The design of the Deltar was based on the hydraulic analogy of the properties and behaviour of water and electricity. Working with analogs of quantities such as the water level, rate of flow and water storage, the design for the calculator basically used the electrical quantities charge, potential, inductance and capacitance ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Analog Computer
An analog computer or analogue computer is a type of computer that uses the continuous variation aspect of physical phenomena such as electrical, mechanical, or hydraulic quantities (''analog signals'') to model the problem being solved. In contrast, digital computers represent varying quantities symbolically and by discrete values of both time and amplitude ( digital signals). Analog computers can have a very wide range of complexity. Slide rules and nomograms are the simplest, while naval gunfire control computers and large hybrid digital/analog computers were among the most complicated. Complex mechanisms for process control and protective relays used analog computation to perform control and protective functions. Analog computers were widely used in scientific and industrial applications even after the advent of digital computers, because at the time they were typically much faster, but they started to become obsolete as early as the 1950s and 1960s, although they ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydraulic Analogy
The electronic–hydraulic analogy (derisively referred to as the drain-pipe theory by Oliver Lodge) is the most widely used analogy for "electron fluid" in a metal conductor. Since electric current is invisible and the processes in play in electronics are often difficult to demonstrate, the various electronic components are represented by hydraulic equivalents. Electricity (as well as heat) was originally understood to be a kind of fluid, and the names of certain electric quantities (such as current) are derived from hydraulic equivalents. As with all analogies, it demands an intuitive and competent understanding of the baseline paradigms (electronics and hydraulics), and in the case of the hydraulic analogy for electronics, students often have an inadequate knowledge of hydraulics. Paradigms There is no unique paradigm for establishing this analogy. Different paradigms have different strengths and weaknesses, depending on how and in what ways the intuitive understanding of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pneumatic Barrier
A pneumatic barrier is a method to contain oil spills. It is also called a bubble curtain. Air bubbling through a perforated pipe causes an upward water flow that slows the spread of oil. It can also be used to stop fish from entering polluted water. A further application of the pneumatic barrier is to decrease the salt-water exchange in navigation locks and prevent salt intrusion in rivers. . Pneumatic barriers are also known as air curtains. The pneumatic barrier is a (non-patented) invention of the Dutch engineer Johan van Veen from around 1940 . A pneumatic barrier is an ''active'' (as opposed to ''passive'') method of waterway oil spill control. (An example of a passive method would be a containment boom.) Method of operation The pneumatic barrier consists of a perforated pipe and a compressed air source. Air escaping from the pipe provides a "hump" of rising water and air which contains the oil spill. Anchors to keep the pipe in a particular spot are helpful. In c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Van Veen Grab Sampler
The Van Veen grab sampler is an instrument to sample sediment in water environments. Usually it is a clamshell bucket made of stainless steel. Up to 20 cm deep samples of roughly 0.1 m2 can be extracted with this instrument. It can be light-weight (roughly 5 kg) and low-tech. The smallest version even fits into hand luggage. The sampler was invented by Johan van Veen (a Dutch engineer) in 1933. A draw-back of the use of this sampler is that it tends to disturb the sediments more than a box corer does. Mechanism While letting the instrument down into the water, the two levers with buckets at their ends are spread like an open scissor. The levers are locked in this position, and unlocked on hitting the ground. When the rope is pulled upward again, the two buckets close and grab a sample from the sea floor. File:VanVeenGrab - Locked.jpg, Van Veen grab when it is locked, ready to be lowered to the floor File:VanVeenGrab - Unlocked.jpg, It is now unlocked after hitting the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flood Barrier
A flood barrier, surge barrier or storm surge barrier is a specific type of floodgate, designed to prevent a storm surge or spring tide from flooding the protected area behind the barrier. A surge barrier is almost always part of a larger flood protection system consisting of floodwalls, levees (also known as dikes), and other constructions and natural geographical features. Flood barrier may also refer to barriers placed around or at individual buildings to keep floodwaters from entering the buildings. Examples Delta Works The Delta Works in the Netherlands is the largest flood protection project in the world. This project consists of a number of surge barriers, the Oosterscheldekering being the largest surge barrier in the world, long. Other examples include the Maeslantkering, Haringvlietdam and the Hartelkering. Thames Barrier The Thames Barrier is the world's second largest movable flood barrier (after the Oosterscheldekering and the Haringvlietdam) and is lo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hollandse IJssel
The Hollandse (or Hollandsche) IJssel (; "Holland IJssel", as opposed to the 'regular' or Gelderland IJssel) is a branch of the Rhine delta that flows westward from Nieuwegein on river Lek through IJsselstein, Gouda and Capelle aan den IJssel to Krimpen aan den IJssel, where it ends in the Nieuwe Maas. Another branch called Enge IJssel ("Narrow IJssel") flows southwest from Nieuwegein. The name IJssel is thought to derive from the Germanic ''i sala'', meaning "dark water". Originally, the Hollandse IJssel forked off from river Lek at Nieuwegein, but the connection was cut off with the Hollandse IJssel nowadays only draining the surrounding pastures. If the North Sea floods, the Hollandse IJssel allows water through the Rotterdam Waterway to flood low-lying land east of Rotterdam. The Delta Works included a steel barrier that can be lowered within minutes to block the waterway. The sea protection constructions were built at the mouth of the Hollandse IJssel in 1957. See al ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
North Sea Flood Of 1953
The 1953 North Sea flood was a major flood caused by a heavy storm surge that struck the Netherlands, north-west Belgium, England and Scotland. Most sea defences facing the surge were overwhelmed, causing extensive flooding. The storm and flooding occurred at the end of Saturday, 31 January 1953 and morning of the next day. A combination of a high spring tide and a severe European windstorm over the North Sea caused a storm tide. The combination of wind, high tide, and low pressure caused the sea to flood land up to above mean sea level. Flooding summary In the Netherlands 20% of the land was below mean sea level (subsequently with the expansion of Flevoland this proportion has increased); the next-highest 30% sat at less than above sea level. Such land relies heavily on sea defences and was worst affected, recording 1,836 deaths and widespread damage. Most of the casualties occurred in the southern province of Zeeland. In England, 307 people were killed in the counties ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cassandra
Cassandra or Kassandra (; Ancient Greek: Κασσάνδρα, , also , and sometimes referred to as Alexandra) in Greek mythology was a Trojan priestess dedicated to the god Apollo and fated by him to utter true prophecies but never to be believed. In modern usage her name is employed as a rhetorical device to indicate a person whose accurate prophecies, generally of impending disaster, are not believed. Cassandra was a daughter of King Priam and Queen Hecuba of Troy. Her elder brother was Hector, the hero of the Greek-Trojan war. The older and most common versions of the myth state that she was admired by the god Apollo, who sought to win her love by means of the gift of seeing the future. According to Aeschylus, she promised him her favours, but after receiving the gift, she went back on her word. As the enraged Apollo could not revoke a divine power, he added to it the curse that nobody would believe her prophecies. In other sources, such as Hyginus and Pseudo-Apollodorus, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marshall Plan
The Marshall Plan (officially the European Recovery Program, ERP) was an American initiative enacted in 1948 to provide foreign aid to Western Europe. The United States transferred over $13 billion (equivalent of about $ in ) in economic recovery programs to Western European economies after the end of World War II. Replacing an earlier proposal for a Morgenthau Plan, it operated for four years beginning on April 3, 1948. The goals of the United States were to rebuild war-torn regions, remove trade barriers, modernize industry, improve European prosperity and prevent the spread of communism. The Marshall Plan proposed the reduction of interstate barriers and the economic integration of the European Continent while also encouraging an increase in productivity as well as the adoption of modern business procedures. The Marshall Plan aid was divided among the participant states roughly on a per capita basis. A larger amount was given to the major industrial powers, as the pre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
