61,984 articles
Refusal direction
The refusal direction is a single direction in a language model's activations whose removal blocks refusal of harmful requests, identified by Arditi and collaborators in 2024.
Refusal training
Refusal training is the set of post-training methods that teach language models to decline harmful or inappropriate requests while answering legitimate ones, spanning supervised fine-tuning, preference optimization, and adversarial training.
Refuse-derived fuel
Refuse-derived fuel is a solid fuel made by shredding municipal waste and removing metals and glass, used to supplement fossil fuels in cement kilns and boilers.
Reg Davies
Reg Davies (1936–2022) was a British-born chemical engineer and particle scientist who spent 23 years at DuPont, retiring as a DuPont Fellow leading its Particle Science and Technology group.
Regal Rexnord
Regal Rexnord Corporation is an American industrial manufacturer headquartered in Milwaukee, Wisconsin, formed in October 2021 by the merger of Regal Beloit and Rexnord's Process & Motion Control business.
Regasification
Regasification is the process of converting liquefied natural gas (LNG) back into gas at import terminals, where it is stored cryogenically, pumped to pipeline pressure, vaporized, and sent into pipelines.
Regency Intrastate Gas (RIGS) Pipeline
The Regency Intrastate Gas (RIGS) Pipeline is a 450-mile intrastate natural gas pipeline in northern Louisiana, operated by Regency and now part of Energy Transfer.
Regenerative braking
Regenerative braking converts a vehicle's kinetic energy into electricity during deceleration, storing it in the battery to extend the range of electric and hybrid vehicles.
Regenerative burner
A regenerative burner is an industrial gas burner that works in pairs with a ceramic heat-storage bed, alternately preheating combustion air with heat recovered from furnace exhaust.
Regenerative cooling
Regenerative cooling is a rocket engine technique in which a propellant flows through channels in the chamber and nozzle walls to cool them, then returns the absorbed heat to combustion.
Regenerative fuel cell
A regenerative fuel cell is a rechargeable electrochemical energy storage device that produces electricity from hydrogen and oxygen, and recharges by splitting the product water back into reactants.
Regenerative thermal oxidizer
A regenerative thermal oxidizer (RTO) is an air pollution control device that destroys volatile organic compounds in industrial exhaust by heating them to combustion temperature, with ceramic beds recovering up to 95% of the heat.
Regenerator (heat exchanger)
A regenerator is a heat exchanger that transfers heat between two gas streams through a storage matrix that alternately absorbs and releases heat, operating cyclically.
Regent Craft
Regent Craft is an American startup founded in 2020 and headquartered in North Kingstown, Rhode Island, that develops all-electric Seagliders, including the 12-passenger Viceroy, a wing-in-ground-effect craft that foils then flies above the water.
Regent International Center (丽晶国际中心)
Regent International Center (丽晶国际中心), formally 新世界·丽晶国际, is a 208-meter, 39-floor S-shaped serviced apartment complex in Xiaoshan, Hangzhou, China, known for housing over 20,000 residents at its peak.
Regent's Canal
Regent's Canal is an 8.5-mile canal in London running from Paddington to Limehouse on the River Thames, authorized in 1812 and opened in two stages between 1816 and 1820.
Reggie Fils-Aimé
Reggie Fils-Aimé (full name Reginald Fils-Aimé) is an American business executive who served as president and COO of Nintendo of America from 2006 until 2019.
Regina Barzilay
Regina Barzilay is a computer scientist and MIT professor who leads AI in medicine at the Jameel Clinic, known for the Mirai and Sybil cancer risk models.
Regina International Airport
Regina International Airport, also known as RCAF Station Regina, serves Regina, Saskatchewan. Opened in 1930, it is Canada's 15th busiest airport, handling about 1.2 million passengers yearly.
Reginald Cooper
Reginald Cooper is an American electronics engineer in the Sensors Directorate at the Air Force Research Laboratory, Ohio, a 2017 PECASE recipient known for radio-frequency electronic warfare research and mentoring.
Reginald Fessenden
Reginald Fessenden was a Canadian-born electrical engineer and inventor who achieved the first transmission of speech by radio waves in 1900 and originated amplitude modulation.
RegioJet
RegioJet is a Czech private railway and bus operator, founded in 2009 as a subsidiary of Student Agency, known for yellow trains on the Prague–Ostrava route since 2011.
Region growing
Region growing, also known as the region growing algorithm, is an image segmentation method that grows connected regions from seed points by adding similar neighboring pixels.
Region proposal network
A region proposal network (RPN) is a fully convolutional module that scans a shared image feature map and predicts candidate object regions, introduced in Faster R-CNN in 2015.
Regional and national shellac 78 rpm production
Regional and national shellac 78 rpm production covers how countries pressed shellac 78 rpm discs differently, from India's Calcutta plants and Japan's Nitchiku to wartime American shellac rationing and reformulation.
Regional Bell Operating Company
A Regional Bell Operating Company, or RBOC, is one of seven regional companies created in 1984 when AT&T divested its local telephone companies, nicknamed Baby Bells.
Regional Clean Hydrogen Hubs
Regional Clean Hydrogen Hubs (H2Hubs) is a US Department of Energy program funding regional hydrogen networks with up to $7 billion; seven hubs in 16 states were selected in 2023.
Regional Container Lines
Regional Container Lines (宏海箱運集團), or RCL, is a Thai container shipping line that began as a Bangkok–Singapore feeder operator in 1979 and listed on the Stock Exchange of Thailand in 1988.
Regional Internet registry
A Regional Internet registry (RIR) is an organization that allocates IPv4 and IPv6 addresses and AS numbers within a world region; the five RIRs receive space from IANA.
Regional Transport Office
A Regional Transport Office (RTO) is a state-level government office in India, operating under the Motor Vehicles Act, 1988, that issues driving licenses, registers vehicles, and collects motor vehicle taxes.