61,984 articles
Retrieval-augmented generation
Retrieval-augmented generation (RAG) is a method for grounding text-generation systems in documents fetched from an external index, introduced in 2020 by Patrick Lewis and colleagues at Facebook AI Research.
Retrieval-based Voice Conversion
Retrieval-based Voice Conversion (RVC) is an open-source voice conversion method, released in 2023, that converts audio into a target speaker's voice while preserving the words spoken.
RETRO (DeepMind model)
RETRO, short for Retrieval-Enhanced Transformer, is a language model developed by DeepMind, introduced in 2021, that conditions predictions on text retrieved from a corpus of up to 2 trillion tokens.
Retro Studios
Retro Studios, Inc. is an American video game developer based in Austin, Texas, founded in 1998 and wholly owned by Nintendo since 2002, best known for Metroid Prime.
Retroreflector free-space optical communication
Retroreflector free-space optical communication uses a modulating retroreflector that returns laser light with data, so only the interrogator end needs a laser and pointing system.
RETScreen
RETScreen is a clean energy management software platform developed by the Government of Canada for evaluating, monitoring, and reporting renewable energy and energy efficiency projects worldwide.
Retting
Retting is the controlled microbial or chemical decomposition of the pectins binding bast fibers to flax, hemp, and similar stems, freeing the fibers for cleaning by scutching and hackling.
Return address stack
The return address stack (RAS), also called a return stack buffer, is a small hardware stack in a processor that predicts the targets of function return instructions.
Return merchandise authorization
A return merchandise authorization (RMA), also called return material authorization, is a numbered authorization a merchant issues to permit a product return for refund, replacement, or repair.
Return ratio
The return ratio is a quantity used in analyzing linear feedback circuits, introduced by Hendrik W. Bode in 1945 and often equated with loop gain.
Return-oriented programming
Return-oriented programming (ROP) is an exploitation technique that chains short instruction sequences, called gadgets, to perform arbitrary computation without injecting code, defeating defenses such as the NX bit.
Return-to-zero format
Return-to-zero (RZ) is a line coding format in optical communications in which the pulse for a binary 1 returns to zero within the bit interval.
Reuben H. Kraft
Reuben H. Kraft is an American computational biomechanics researcher who models how mechanical forces damage the human brain, and a Penn State professor since 2013 who won a Presidential Early Career Award.
Reuben Samuels
Reuben Samuels was an American geotechnical and underground-construction engineer who spent over 30 years at Crimmins Constructors before joining Parsons Brinckerhoff in New York in 1992.
Reuel Shinnar
Reuel Shinnar (1923–2011) was an Austrian-born American chemical engineer, a longtime City College of New York professor elected to the National Academy of Engineering in 1985.
Reusability (launch vehicles)
Reusability in launch vehicles is the practice of recovering and reflying rocket hardware like the first stage, pioneered by the Space Shuttle and made routine by SpaceX's Falcon 9.
Reusable spacecraft
A reusable spacecraft is a space vehicle designed to fly multiple missions, recovering its hardware instead of discarding it, ranging from the Space Shuttle to SpaceX's Falcon 9 and Starship.
Reusable Vehicle Testing
Reusable vehicle testing is the sequence of ground and flight campaigns proving reusable launch vehicles can survive launch, reentry, landing, and reflight, tracing to NASA's 1990s demonstrators.
Rev-9
The Rev-9 is a fictional Terminator model played by Gabriel Luna in Terminator: Dark Fate (2019), combining a metal endoskeleton with a liquid metal exterior.
Reve Image
Reve Image is a proprietary text-to-image model family from startup Reve AI in Palo Alto, California, first released in March 2025 and noted for prompt adherence and typography.
Revel Systems
Revel Systems is an American point-of-sale software company founded in 2010 by Lisa Falzone and Chris Ciabarra, offering an iPad-based platform for restaurants and retail.
Revelstoke hydroelectric plant
The Revelstoke hydroelectric plant, also known as Revelstoke Dam and Generating Station, is a 2,480 MW BC Hydro station on the Columbia River in British Columbia.
Revenge-class battleship
The Revenge class, also called the Royal Sovereign or R class, was a group of five super-dreadnought battleships built for the British Royal Navy and completed in 1916 and 1917.
Revenue management
Revenue management is the use of forecasting and optimization to sell a fixed, perishable inventory, like airline seats, at differentiated prices, aiming to sell the right seat to the right customer at the right price.
Revenue per available seat mile
Revenue per available seat mile (RASM, or unit revenue) is an airline performance measure equal to operating revenue divided by available seat miles, capacity offered whether or not it is sold.
Reverberation chamber
A reverberation chamber, also called a mode-stirred chamber, is a highly reflective shielded metal enclosure whose rotating paddles create a statistically uniform electromagnetic field for electromagnetic compatibility testing.
Reverion
Reverion GmbH is a German clean-energy startup spun off from the Technical University of Munich, based in Eresing, that builds container-sized carbon-negative biogas power plants.
Reverse acqui-hire wave
A reverse acqui-hire is a deal where a tech giant hires a startup's leaders and researchers and pays a large fee, usually for a license, without acquiring the company.
Reverse bias breakdown
Reverse bias breakdown is the onset of large reverse current in a solar cell under reversed voltage, occurring around −2 V in perovskite cells and causing hot spots and degradation.
Reverse DNS lookup
A reverse DNS lookup is a DNS query that maps an IP address to a domain name using PTR records in the in-addr.arpa and ip6.arpa zones.