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Derailment
A derailment is a railway accident in which a vehicle's wheels leave the rails, ranging from a single wheel at low speed to a multi-car main-line wreck.
Derandomization
Derandomization converts a randomized algorithm into an equivalent deterministic one without substantially increasing its complexity; whether BPP equals P is a central open question in complexity theory.
Derby Litchurch Lane Works
Derby Litchurch Lane Works, formerly the Derby Carriage and Wagon Works, is a railway rolling stock factory in Derby, England. Owned by Alstom and opened in 1876, it is the UK's only end-to-end train factory.
Derek H. Warner
Derek H. Warner is an engineering researcher who studies metal deformation and fracture through atomic-level simulation, formerly a Cornell professor and PECASE awardee now at the University of Canterbury.
Derek R. Gaston
Derek R. Gaston is an American computational nuclear engineer who founded the MOOSE multiphysics simulation framework at Idaho National Laboratory and received the Presidential Early Career Award.
Derelict satellite
A derelict satellite is an artificial satellite in Earth orbit that no longer performs its mission and is not being operated, whether failed or retired to a graveyard orbit.
Derelict spacecraft
A derelict spacecraft is an inert, unsteerable object in orbit, unable to reach a graveyard orbit. The defunct Cosmos 2251 destroyed Iridium 33 in the 2009 collision.
Dereverberation
Dereverberation is a signal processing method that removes reverberation, the delayed reflections of sound in a room, from recordings to improve speech clarity and recognition.
Deriner Dam
Deriner Dam is a 249 m double-curvature concrete arch dam on the Çoruh River, 5 km upstream of Artvin, Turkey, feeding a 670 MW underground hydroelectric plant.
Derna dam collapses
The Derna dam collapses were the 2023 failures of two aging dams above Derna, Libya, during Storm Daniel, unleashing a flood that killed thousands and destroyed whole neighborhoods.
Derpibooru
Derpibooru, also reachable as trixiebooru.org, is an image board dedicated to My Little Pony fan art. Founded in 2012, it is the largest My Little Pony image archive.
Derrick
A derrick is a lifting apparatus with a mast held by guys or braces, used with a hoist to raise and lower loads, also naming oil rig towers.
Derrick M. Kuzak
Derrick M. Kuzak is an American automotive engineer who retired in 2012 as group vice president of Global Product Development at Ford, after a 34-year career there.
Derringer
A derringer, or deringer pistol, is a small pocket pistol named for Philadelphia gunmaker Henry Deringer, whose 1825 design was widely copied, including the Remington Double Derringer of 1866.
Derry city walls
The Derry city walls, also called the Walls of Derry, are a complete circuit of 17th-century fortifications in Derry, Northern Ireland, built 1613–1618 and famous for withstanding the 1689 siege.
Derwent Reservoir (Derbyshire)
Derwent Reservoir is a reservoir in the Upper Derwent Valley of the Derbyshire Peak District, England, brought into use in 1916 to supply drinking water to nearby cities.
Derwitzer Glider
The Derwitzer Glider was a hang glider built by Otto Lilienthal in 1891, flown near Derwitz in Brandenburg and seen as the beginning of successful human flight.
Derya Baran
Derya Baran is a Turkish materials scientist and associate professor at KAUST in Saudi Arabia who works on organic semiconductors for solar cells and thermoelectrics, leading the OMEGA Laboratory.
Desalination
Desalination is the removal of dissolved salts from seawater or brackish water to produce fresh water; over 20,000 plants operate worldwide, most using reverse osmosis membranes.
Desalination by country
Desalination by country surveys national reliance on removing salt from seawater and brackish water, with global capacity of 69.3 million m³/day led by Saudi Arabia, China, and the United States.
Desalination plant intake and outfall engineering
Desalination plant intake and outfall engineering designs the systems that bring raw seawater into a plant and return concentrated brine, covering up to 20% of facility capital cost.
Descartes Systems Group
The Descartes Systems Group is a Canadian software company headquartered in Waterloo, Ontario, providing software-as-a-service solutions that help logistics-intensive businesses route, track, and manage shipments.
Descomplica, Ltd.
Descomplica is a Brazilian online education company founded in 2011 in Rio de Janeiro by physics teacher Marco Fisbhen, now offering test prep and digital college degrees.
Describing function
The describing function is an approximate frequency-domain method in control engineering that replaces a nonlinear element with an equivalent complex gain, chiefly to predict limit cycles in feedback loops.
Descript, Inc.
Descript, Inc. is a private American software company developing Descript, an audio and video editor where deleting words in the transcript cuts the recording, used for podcasts.
Description logic
Description logic (DL) is a family of decidable knowledge representation languages describing domains via concepts, roles, and individuals, and underpinning the Web Ontology Language OWL 2.
Deserialization
Deserialization is the computing process that rebuilds data from a serialized format, such as a byte stream, into an in-memory object a program can use.
Desert Air Force
The Desert Air Force, also known as the Western Desert Air Force, was the RAF formation supporting the Eighth Army in North Africa and Italy from 1941 to 1945.
Desert Diamond Arena
Desert Diamond Arena, formerly Glendale Arena and Gila River Arena, is a city-owned indoor arena in Glendale, Arizona, opened in 2003 for the Arizona Coyotes.
Desert Eagle
The Desert Eagle, also known as the Deagle, is a large-frame gas-operated semi-automatic pistol developed by Magnum Research and first marketed in 1983 as the Mark I chambered in .357 Magnum.