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Radeon RX Vega series
The Radeon RX Vega series is a family of high-end AMD graphics cards launched in July 2017, comprising the RX Vega 56 and RX Vega 64.
Radford Army Ammunition Plant
Radford Army Ammunition Plant is a U.S. Army facility in Montgomery and Pulaski Counties, southwest Virginia, the country's only active military propellant manufacturing center, operating since 1941.
Radhakrishnan L. Nagarajan
Radhakrishnan L. Nagarajan is an optical communications engineer who is Chief Technology Officer of Optical Engineering at Marvell Technology and was elected to the National Academy of Engineering in 2025.
Radhika Nagpal
Radhika Nagpal is a computer scientist who works on self-organizing robot collectives, created the Kilobot thousand-robot swarm, and has been a professor of engineering at Princeton University since 2022.
Radia Perlman
Radia Perlman is an American network engineer and computer scientist who designed the Spanning Tree Protocol, adopted as IEEE 802.1D in 1990, and the DECnet routing algorithm standardized as IS-IS.
Radial basis function kernel
The radial basis function (RBF) kernel, also called the Gaussian kernel, measures the similarity of two points as a decreasing function of their Euclidean distance in machine learning.
Radial basis function network
A radial basis function network is a supervised-learning model, usually a two- or three-layer neural network, whose locally tuned hidden units approximate functions for classification and time-series prediction.
Radial engine
A radial engine is a piston engine with cylinders arranged in a circle around the crankshaft, developed for aircraft because it is light and air-cooled.
Radial gate
The radial gate, also called the Tainter gate, is a dam spillway gate with a curved upstream face that rotates on a horizontal trunnion to control water flow.
Radial piston motor
A radial piston motor is a hydraulic or pneumatic motor with pistons arranged in a star formation, producing low-speed, high-torque rotation that drives winches, mixers, and wheels without a gearbox.
Radial shaft seal
A radial shaft seal, also known as a lip seal or oil seal and called a Simmerring in German, seals a rotating shaft to retain lubricant and exclude contaminants.
Radial tire
A radial tire, also called a radial-ply or steel-belted radial, is a pneumatic tire whose ply cords run at 90 degrees to travel under a circumferential belt.
Radiant barrier
A radiant barrier is a reflective building material, typically aluminum foil, that blocks radiant heat transfer; most are installed in attics, cutting cooling costs by 8 to 12 percent.
Radiant cooling
Radiant cooling is a method of space cooling in which a chilled ceiling or floor, fed by circulating water, removes heat from a room mainly by thermal radiation.
Radiant Nuclear
Radiant Nuclear, formerly Radiant Industries, is a nuclear startup in El Segundo, California, founded by former SpaceX engineer Doug Bernauer to develop Kaleidos, a transportable microreactor that fits in a single shipping container.
Radiation and Nuclear Safety Authority
The Radiation and Nuclear Safety Authority (Säteilyturvakeskus, STUK) is Finland's national regulatory authority for nuclear safety, radiation protection, safeguards, and emergency preparedness, reporting annually to the Ministry of Economic Affairs and Employment.
Radiation hardening
Radiation hardening, also called nuclear hardness, is the practice of making electronic devices and systems tolerate ionizing radiation in space, by hardening the semiconductor process, circuit design, or shielding.
Radiation pattern
A radiation pattern is the graphical or mathematical description of how the power radiated or received by an antenna varies with direction in three-dimensional space, measured in the far field.
Radiation-induced swelling
Radiation-induced swelling is the increase in volume of irradiated metals and alloys, caused by voids forming from radiation-produced vacancies; first reported in 1967 from Dounreay Fast Reactor cladding.
Radiator
A radiator, also called an automobile or car radiator when fitted to vehicles, is a device that transfers heat from a hot fluid to its surroundings, used in buildings, vehicle engines, and spacecraft.
Radiator panel (spacecraft)
A radiator panel is an external spacecraft surface that rejects waste heat by thermal radiation, connected to heat sources through heat pipes, pumped fluid loops, or thermal straps.
Radio
Radio is a technology for sending information over distance using electromagnetic waves, through a transmitter that modulates a carrier wave and a receiver that recovers it.
Radio Act of 1912
The Radio Act of 1912 is the first general United States federal law on radio, requiring licenses for stations and operators, passed after the Titanic disaster.
Radio block centre
A radio block center (RBC) is the trackside unit of the European Train Control System that sends trains movement authorities by radio in ETCS Level 2.
Radio button
A radio button, also called an option button, is a graphical user interface control for selecting exactly one option from a set, named for car radio station buttons.
Radio Data System
The Radio Data System (RDS), also called Radio Broadcast Data System, is a standard for sending digital data alongside FM radio to display station names and traffic announcements.
Radio environment map
A radio environment map (REM) is a database combining spectrum use, terrain, regulations, and radio locations to support cognitive radio networks, proposed at Virginia Tech in 2006.
Radio masts and towers
Radio masts and towers are elevated structures supporting antennas for broadcasting, wireless communication, and microwave links; a tower is self-supporting, while a mast is held upright by guy wires.
Radio Mirchi (रेडियो मिर्ची)
Radio Mirchi (रेडियो मिर्ची) is a private FM radio network in India run by ENIL of the Times Group, launched in 2001 and best known on 98.3 MHz.
Radio network
A radio network is an organized system of base stations, repeaters, and mobile units that carries dispatch voice and data in land mobile radio services.