61,984 articles
Ratio control
Ratio control is a process-control strategy that keeps one flow proportional to another, independently varying flow, so a mixture or reaction holds a specified composition or condition.
Rational Software
Rational Software was an American software development tools company co-founded in 1981 by Paul Levy and Michael Devlin, acquired by IBM in 2003 for about $2.1 billion.
Ratnagiri Gas and Power Private Ltd
Ratnagiri Gas and Power Private Limited (RGPPL) is an Indian power generation company, formed in 2005 to revive the abandoned Enron Dabhol project, now a subsidiary of NTPC.
Ratnagiri Power Plant
The Ratnagiri Power Plant is a 1,200 MW coal-fired power station at Jaigad in Ratnagiri district, Maharashtra, India, owned by JSW Energy and supplying the state grid since 2010.
RATP Group
RATP Group, also known as Groupe RATP, is the French state-owned urban transport group created in 1948 that operates the Paris region's metro, bus, tram, and suburban rail services.
Ratqa and Lower Fars oil fields
Ratqa, also called South Ratqa, is a heavy oil field in northern Kuwait, where the Lower Fars reservoir holds up to 15 billion barrels of oil.
Raufoss Mk 211
Raufoss Mk 211, Norwegian designation NM140 MP, is a multipurpose .50 BMG cartridge developed in Norway, combining armor-piercing, high-explosive, and incendiary effects in one projectile against material targets.
Ravelin
A ravelin, also called a demi-lune (half-moon), is a detached triangular outwork of a bastioned fortress, typically placed in the ditch between two bastions to cover the gate and curtain.
Raven II (surgical robot)
Raven II is an open-source teleoperated surgical robotics research platform developed by the University of Washington and UC Santa Cruz, shipped to seven US research laboratories in 2012.
Raven Industries
Raven Industries is a technology company in Sioux Falls, South Dakota, founded in 1956 to make high-altitude research balloons and now a CNH Industrial brand known for precision agriculture.
Raven Oil and Gas Field
The Raven field is a near-HPHT gas and condensate field about 60 km offshore Alexandria, Egypt, discovered in 2004 and producing since early 2021 under bp.
Raven Software
Raven Software, also called Ravensoft, is an American video game studio in Middleton, Wisconsin, founded in 1990 by brothers Brian and Steve Raffel and known for Call of Duty: Warzone.
Ravenna LNG Terminal
The Ravenna LNG Terminal is an Italian offshore LNG terminal using the FSRU BW Singapore, moored off Ravenna in the northern Adriatic, in service since May 2025.
Ravensburger
Ravensburger is a German toy and game manufacturer based in Ravensburg, founded by Otto Maier in 1883 and best known for jigsaw puzzles, board games, and children's books.
Ravenswood power station
Ravenswood power station, also known as Ravenswood Generating Station, is New York City's largest fossil-fired power station, opened in Long Island City, Queens, in 1963 and known for Big Allis.
Ravensworth Coal Mine
Ravensworth Coal Mine, formally Ravensworth Operations, is a Glencore-owned open cut complex in the Upper Hunter Valley of New South Wales producing thermal and semi-soft coking coal.
Ravensworth Underground Mine
Ravensworth Underground Mine was a longwall coal mine in the Hunter Valley of New South Wales, Australia, that produced semi-soft coking coal before closing in 2014.
Ravi Kumar Singisetti
Ravi Kumar Singisetti, also known as Ravi Kumar S, is an Indian-born business executive and chief executive officer of the IT services company Cognizant since 2023.
Ravi Ramamoorthi
Ravi Ramamoorthi is an American computer scientist in computer graphics and vision, a UC San Diego professor known for the signal-processing theory of light reflection.
Ravi Sethi
Ravi Sethi is a computer scientist known for the Sethi–Ullman algorithm and for co-authoring the compilers textbook Compilers: Principles, Techniques, and Tools, the "dragon book."
Ravi Shankar Prasher
Ravi Shankar Prasher is an American mechanical engineer who works on nanoscale heat transport and thermal management of electronics, and is Chief Technology Officer of Bloom Energy.
Ravi V. Bellamkonda
Ravi V. Bellamkonda is a biomedical engineer known for neural interfaces and the tumor monorail device that lures brain tumor cells out of the brain; he became Ohio State's 18th president in 2026.
Ravindran Kannan
Ravindran Kannan is a theoretical computer scientist known for algorithms, the geometry of numbers, and machine learning foundations, winner of the 1991 Fulkerson Prize and 2011 Knuth Prize.
Ravva oil and gas field
The Ravva oil and gas field is a shallow offshore field in the Krishna Godavari Basin off Andhra Pradesh, India, discovered by ONGC in 1987.
Raw material
A raw material, also known as a feedstock or primary commodity, is a basic substance used to produce goods, from iron and wood to computer chips.
Rawalpindi-Islamabad Metrobus
The Rawalpindi-Islamabad Metrobus, also called the Islamabad Metrobus, is a bus rapid transit line linking Rawalpindi and Islamabad, Pakistan, opened in 2015 with a 22.5 km dedicated corridor.
Rawhide Coal Mine
The Rawhide Coal Mine is an active surface coal mine in Wyoming's Powder River Basin, about 10 miles north of Gillette, producing thermal coal for Peabody Energy.
Rawlings (sporting goods)
Rawlings, founded in St. Louis in 1887 by George and Alfred Rawlings, is an American maker of baseball and softball equipment and MLB's official ball supplier since 1977.
Ray casting
Ray casting is a rendering technique that casts one ray per pixel from the eye and sets the pixel's color from the first surface or volume samples it meets.
Ray cat
The ray cat (Strahlenkatze) is a hypothetical cat breed proposed in 1984 by Françoise Bastide and Paolo Fabbri that would change color near radiation, warning of buried nuclear waste.