All articles starting with R
22,461 articles
Reverberation
Reverberation is the persistence of sound in an enclosed space after the source stops, produced by many reflections; it is measured by reverberation time (RT60).
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.
Reverberation mapping
Reverberation mapping is an astronomical technique measuring the time delay between an active galactic nucleus's continuum variations and its emission lines, giving black hole masses without needing distance.
Revere Franklin Weidner
Revere Franklin Weidner (1851–1915) was an American Lutheran theologian who taught dogmatics, exegesis, and Hebrew at the Augustana and Chicago seminaries and wrote an eight-volume dogmatic theology later widely reissued.
Reverence Capital Partners (private equity firm)
Reverence Capital Partners is a New York-based private investment firm founded in 2013 by Milton Berlinski, Peter Aberg, and Alexander Chulack that invests in middle-market financial services businesses.
Reverend Ike
Reverend Ike, born Frederick J. Eikerenkoetter II, was an American clergyman who preached a prosperity gospel to a national radio and television audience from New York.
Rêverie (Debussy)
Rêverie (L. 68, CD 76) is an 1890 solo piano piece by Claude Debussy, published by Eugène Fromont in 1905 despite Debussy's written objection; a four-minute Andantino, it is among his most popular early piano works.
Reverie (TV series)
Reverie is an American NBC science-fiction drama created by Mickey Fisher, airing May 30 to August 8, 2018, 10 episodes starring Sarah Shahi as a hostage negotiator rescuing users trapped in a virtual-reality program; canceled after one season.
Reveries of the Solitary Walker
Reveries of the Solitary Walker (Les Rêveries du promeneur solitaire) is the last major work of Jean-Jacques Rousseau, an autobiographical text written 1776–1778 and published in 1782.
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.
Reversal learning
Reversal learning is a behavioral paradigm in which a subject learns that one cue is rewarded before the contingencies reverse, measuring cognitive flexibility across species.
Reversal of Fortune
Reversal of Fortune is a 1990 Barbet Schroeder drama, from Alan Dershowitz's book, about Claus von Bulow's appeal; Jeremy Irons won the 1991 Best Actor Oscar. The phrase also names academic reversal-of-fortune theses.
Reversal potential
Reversal potential, also called the Nernst or equilibrium potential, is the membrane voltage at which net current through an ion channel is zero, reversing direction when crossed.
Reverse (2026 TV series)
Reverse (리버스) is a 2026 Wavve Korean mystery thriller, 8 episodes aired April 17 to May 8, 2026, starring Seo Ji-hye, Go Soo, and Kim Jae-kyung; directed by Lim Gun-joong, adapted from his 2022 audio movie about amnesia and a villa explosion.
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 acquisition
A reverse acquisition is a business combination in which the legal acquirer is identified as the accounting acquiree, under IFRS 3 and ASC 805, often called a reverse merger.
Reverse auction
A reverse auction is a procurement method in which suppliers bid prices downward in real time for a buyer's contract, typically saving 10 to 20 percent.
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 circulation drilling
Reverse circulation drilling is a percussive exploration method in which compressed air carries rock chips up an inner tube, giving clean samples for mineral exploration and grade control.
Reverse correlation
Reverse correlation is a psychophysical method in which observers classify noisy stimuli, and averaging these choices yields a classification image of the internal representation used.
Reverse Course (逆コース)
Reverse Course (逆コース) is the 1947–1950 shift in US occupation policy in Japan from demilitarization and democratization to economic recovery and anti-communism, engineered largely by George F. Kennan, with the term coined by Japanese critics in the mid-1950s.
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.
Reverse electrodialysis
Reverse electrodialysis (RED) is a membrane-based technology that generates renewable electricity, sometimes called blue energy, from the controlled mixing of seawater and river water using ion exchange membranes.
Reverse engineering
Reverse engineering, also called back engineering, analyzes an existing product, system, or program to recover knowledge of its design, function, or requirements when that knowledge is missing or withheld.
Reverse ETL
Reverse ETL (rETL, data activation, operational analytics) syncs modeled data from a data warehouse or lakehouse back out into operational tools like CRMs, marketing platforms, and ad systems, inverting traditional ETL's direction; typically batch, with conflict-resolution and latency limits.
Reverse genetics
Reverse genetics is a genetic analysis approach that starts from an altered gene and infers its function from the phenotype, the reverse of forward genetics.
Reverse gyrase
Reverse gyrase is the only DNA topoisomerase that introduces positive supercoils into DNA, in an ATP-dependent reaction. Found in hyperthermophiles above about 70°C and absent from mesophiles, it fuses a helicase and type IA topoisomerase domain and aids genome stability and DNA repair at high temperature.
Reverse image search
Reverse image search is a search method that submits an image as the query instead of text, returning matching or similar images and the pages containing them.
Reverse immunology
Reverse immunology is a computational approach that predicts T-cell or B-cell epitopes directly from pathogen or tumor genome sequences, inverting classical epitope discovery to identify vaccine and immunotherapy targets without growing the organism.
Reverse logistics
Reverse logistics is the movement of goods from their place of use back to their place of manufacture, sale, or disposal, covering returns, repair, remanufacturing, and recycling.