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Rag-e Sefid Oil Field
Rag-e Sefid, also written Rag Sefid, is an onshore oil and gas field in Khuzestan province, southwest Iran, producing since 1966 with reserves of 2.4 billion barrels.
RAGAS
RAGAS (Retrieval Augmented Generation Assessment) is an open-source Python framework for evaluating RAG pipelines, introduced in September 2023 with reference-free metrics like faithfulness scored by an LLM judge.
Ragdoll physics
Ragdoll physics, also called ragdoll simulation, is a game technique where a character's body is simulated as jointed rigid bodies that collapse and tumble instead of playing fixed animations.
Raghunathpur Thermal Power Station
Raghunathpur Thermal Power Station is a coal-fired plant of the Damodar Valley Corporation at Raghunathpur in Purulia district, West Bengal, with two 600 MW units commissioned from 2015.
Raglan Castle
Raglan Castle (Castell Rhaglan) is a ruined late medieval fortress-palace in Monmouthshire, Wales, begun by Sir William ap Thomas in 1435, enlarged by William Herbert, Earl of Pembroke, and destroyed after surrendering to Parliamentarians in August 1646.
Raguba oil field
The Raguba oil field is an onshore oil field in Concession 20 of Libya's central Sirte Basin, producing since 1963 and operated by state-owned Sirte Oil Company.
Rahul Mangharam
Rahul Mangharam is a professor of electrical and systems engineering at the University of Pennsylvania, where he directs the Safe Autonomous Systems Lab and researches medical device safety.
Rahul Mehrotra
Rahul Mehrotra (born 1959) is an Indian architect, urbanist, and educator who founded RMA Architects in Mumbai and Boston and is a professor at Harvard's Graduate School of Design, known for the Kinetic City concept.
Raia gas field
Raia is a gas and condensate field in the pre-salt Campos Basin offshore Rio de Janeiro, Brazil, holding over 1 billion barrels of oil equivalent, with production expected in 2028.
Raibert hopping controller
The Raibert hopping controller is a three-part control scheme for dynamically stable legged robots, introduced by Marc Raibert in the early 1980s to regulate hopping height, speed, and attitude.
Raibo
Raibo (라이보) is a quadruped robot developed at KAIST in South Korea; its RAIBO2 version became the first quadruped to complete a full marathon, in 2024.
Raichur Thermal Power Station
Raichur Thermal Power Station (RTPS) is a 1,720 MW coal-fired power station at Shaktinagar, Raichur district, Karnataka, India, owned by Karnataka Power Corporation Limited. Its eight units were commissioned between 1985 and 2010.
RAID
RAID (Redundant Array of Independent Disks, originally Inexpensive Disks) combines multiple disk drives into logical units for speed, fault tolerance, or both, named in a 1988 Berkeley paper.
RAID 5
RAID 5 is a disk-array layout that stripes data blocks with parity distributed across three or more drives, so it survives any single drive failure.
Raid on Entebbe (film)
Raid on Entebbe is a 1977 American docudrama directed by Irvin Kershner, starring Peter Finch and Charles Bronson, dramatizing the 1976 Israeli rescue of hostages in Uganda.
Raigad Fort
Raigad Fort, formerly known as Rairi, is a hill fort in Maharashtra, India, that served as Chhatrapati Shivaji Maharaj's capital and the scene of his 1674 coronation.
Raikheda power station
Raikheda power station, also called the Raipur thermal power plant, is a 1,370 MW coal-fired power station in Raipur district, Chhattisgarh, India, owned by Adani Power.
Rail Baltica
Rail Baltica is a program to build an electrified, standard-gauge railway for passenger and freight linking Tallinn and Riga to Kaunas and Warsaw, the European Union's flagship North Sea–Baltic corridor project.
Rail defect detection
Rail defect detection is the set of non-destructive testing methods, chiefly magnetic induction and ultrasonic testing from detector cars, used to find internal rail flaws before they cause breaks.
Rail Delivery Group
The Rail Delivery Group (RDG) is the British rail industry body bringing together train operators, Network Rail, and HS2, established in June 2011 after the McNulty report.
Rail fastening system
A rail fastening system attaches the rail foot to the sleeper using components such as a spring clip, rail pad, insulator, and shoulder or screw anchor.
Rail freight transport
Rail freight transport, also called freight rail, is the carriage of goods by train over a railway network, typically in wagons for bulk commodities or containers for intermodal traffic.
Rail grinding
Rail grinding is a railway maintenance process that removes a thin layer of metal from the railhead with rotating abrasive stones, introduced by the Pennsylvania Railroad in the late 1930s.
Rail lubricator
A rail lubricator is a trackside or on-board device that applies grease or friction modifier to wheel flanges in curves, reducing wear, noise, and energy consumption while preserving traction and braking.
Rail profile
A rail profile is the cross-sectional shape of a railway rail, made up of a running head, web, and foot, in bullhead or flat-bottom (Vignole) families standardized under EN 13674-1 and AREMA.
Rail Safety and Standards Board
The Rail Safety and Standards Board (RSSB) is Britain's independent rail safety, standards, and research body, established in 2003 after the Ladbroke Grove crash and owned by the rail industry.
Rail transport
Rail transport, also known as railway or railroad transport, is the movement of passengers and freight on wheeled vehicles running along fixed steel tracks; in 2023 the world's network spanned 1.17 million km.
Rail transport in China
Rail transport in China is the state-dominated national railway system, with about 165,000 km of line in 2025, over 50,000 km of it high-speed, and the world's busiest traffic.
Rail transport in Great Britain
Rail transport in Great Britain is the mainline passenger and freight railway network of England, Scotland, and Wales, carrying over 1.6 billion passenger journeys in 2024.
Rail transport in India
Rail transport in India, operated mainly by Indian Railways, began in 1853 and runs one of the world's largest rail networks, carrying 6.9 billion passenger journeys in 2023-24.