Željko Ražnatović was a Serbian nationalist who headed the paramilitary Serbian Volunteer Guard (known as the Tigers), which was accused of committing atrocities during the conflicts that accompanied the breakup of Yugoslavia in the first half of the 1990s. Ražnatović’s father was an officer in the

Željko Ražnatović was a Serbian nationalist who headed the paramilitary Serbian Volunteer Guard (known as the Tigers), which was accused of committing atrocities during the conflicts that accompanied the breakup of Yugoslavia in the first half of the 1990s. Ražnatović’s father was an officer in the

Bolivia: The rise of new political groups and the Bolivian National Revolution: …by a secret military group, Reason for the Fatherland (Razón de Patria; RADEPA). RADEPA allied itself with the MNR and tried to create a new-style government under Colonel Gualberto Villaroel (1943–46), but little was accomplished except for the MNR’s political mobilization of the Indian peasants. Opposed as fascist-oriented by the…

razor, keen-edged cutting implement for shaving or cutting hair. Prehistoric cave drawings show that clam shells, shark’s teeth, and sharpened flints were used as shaving implements. Solid gold and copper razors have been found in Egyptian tombs of the 4th millennium bce. According to the Roman

razor clam, any of the species of marine bivalve mollusks of the family Solenidae. In England the species of the genera Ensis and Solen are called razor shells. The Solenidae are common in intertidal sands and muds, particularly of temperate seas. These bivalves have narrow and elongated razorlike

shrimpfish, any of four species of small, tropical marine fishes of the family Centriscidae (order Gasterosteiformes), found in the Indo-Pacific. The name razorfish derives from the shrimpfishes’ characteristic sharp-edged belly. Shrimpfishes are nearly transparent, long-snouted, shrimplike fishes,

razor clam, any of the species of marine bivalve mollusks of the family Solenidae. In England the species of the genera Ensis and Solen are called razor shells. The Solenidae are common in intertidal sands and muds, particularly of temperate seas. These bivalves have narrow and elongated razorlike

AC/DC: The Razor’s Edge (1990) featured the hit singles “Thunderstruck” and “Moneytalks,” the latter of which reached number 23 on the Billboard chart, making it the group’s sole Top 40 single. The band settled into a pattern of roughly two studio releases per decade, following The…

The Razor’s Edge, philosophical novel by W. Somerset Maugham, published in 1944. The novel is concerned in large part with the search for the meaning of life and with the dichotomy between materialism and spirituality. Set in Chicago, Paris, and India in the 1920s and ’30s, it involves characters

Edmund Goulding: The 1940s: …adaptation of another Maugham novel, The Razor’s Edge. The 1946 drama was nominated for an Academy Award as best picture, and it was one of Goulding’s finest films. A hardened Tyrone Power was surprisingly convincing as the hero on a spiritual quest, and he was well supported by Gene Tierney,…

razor-billed auk, (Alca torda), black and white seabird of the North Atlantic, bearing a sharp, heavy, compressed beak. About 40 cm (16 inches) long, it is the largest living member of the auk family, Alcidae (order Charadriiformes), and the nearest kin to the extinct great auk. Razor-billed auks

fin whale, (Balaenoptera physalus), a slender baleen whale, second in size to the blue whale and distinguishable by its asymmetrical coloration. The fin whale is generally gray with a white underside, but the right side of the head has a light gray area, a white lower jaw, and white baleen at the

razor-billed auk, (Alca torda), black and white seabird of the North Atlantic, bearing a sharp, heavy, compressed beak. About 40 cm (16 inches) long, it is the largest living member of the auk family, Alcidae (order Charadriiformes), and the nearest kin to the extinct great auk. Razor-billed auks

Razumovsky Quartets, three string quartets by Ludwig van Beethoven composed in 1805–06 for the Russian ambassador to Vienna, Count Andreas Razumovsky. They premiered in Vienna in February 1807 and were published as a set the following year. The Razumovsky Quartets reflect a sharp departure from

Vladimir Lenin: Formation of a revolutionary party of Vladimir Lenin: …which culminated in his magisterial Development of Capitalism in Russia (published legally in 1899). In this work, a study of Russian economics, he argued that capitalism was rapidly destroying the peasant commune. The peasantry constituted for the Populists a homogeneous social class, but Lenin claimed that the peasantry was in…

ghanīmah: …society, where the ghazw (razzia, or raid) was a way of life and a point of honour, ghanīmah helped provide the material means of existence. After the leader of the ghazw received a fourth or a fifth of the booty, the rest was divided among the raiders according to…

Crusades: Legal practices: …a court overseen by the rais (raʾīs), a chieftain of importance under the Frankish regime. An important element in the kingdom’s army, the corps of Turcopoles, made up of lightly armed cavalry units, was composed largely of native Christians, including, apparently, converts from Islam. The principle of personality of law…

Ebrahim Raisi was president of Iran (2021–24) before his sudden death in a helicopter crash. The unpopular prosecutor—called the “Butcher of Tehrān” for his role in the execution of thousands of political prisoners in 1988—was thrust to power by the clerical establishment as a potential successor

ras el hanout, versatile and aromatic spice blend used in North African cuisine. Recipes vary widely, but the mixture can consist of dozens of spices in varying amounts to strike a balance between earthy, bitter, spicy, and sweet flavors. Blends commonly include anise, cardamom, cinnamon, clove,

Ras al-Khaimah, constituent emirate of the United Arab Emirates (formerly Trucial States, or Trucial Oman). It consists of two irregularly shaped tracts on the Musandam Peninsula, oriented north-south. The northern section shares the Ruʾūs al-Jibāl peninsula with the sultanate of Oman and has a

Ras Tanura, port on the Persian Gulf, in eastern Saudi Arabia, at the tip of a small peninsula. Developed by the Arabian American Oil Company (now Saudi Aramco) after the discovery of nearby petroleum deposits in the 1930s, it is now a principal Persian Gulf terminal of the pipelines and has a

Musandam Peninsula, peninsula, a northeastern extension of the Arabian Peninsula, separating the Gulf of Oman on the east from the Persian Gulf on the west to form the Strait of Hormuz to the north. The Ruʾūs al-Jibāl (“the Mountaintops”), the northernmost extremity of the Al-Ḥajar al-Gharbī

Ugarit, ancient city lying in a large artificial mound called Ras Shamra (Raʾs Shamrah), 6 miles (10 km) north of Latakia (Al-Lādhiqiyyah) on the Mediterranean coast of northern Syria. Its ruins, about half a mile from the shore, were first uncovered by the plow of a peasant at Al-Bayḍā Bay.

ijtihād: …mainly in the form of raʾy (personal judgment) and qiyās (analogical reasoning), and those who did so were termed mujtahids. But with the crystallization of legal schools (madhhabs) under the ʿAbbāsids (reigned 750–1258), jurists of the majority Sunni branch of Islam came to

Judaism: The making of the Zohar (c. 1260–1492): …markedly different theological orientation: the Raʿya mehemana (“Faithful Shepherd”—i.e., Moses the prophet), the particular subject of which is the interpretation and theosophic justification of the precepts of the Torah; and the Tiqqune zohar, consisting of elaborations in the same vein bearing upon the first word of the book of Genesis…

rubidium (Rb), chemical element of Group 1 (Ia) in the periodic table, the alkali metal group. Rubidium is the second most reactive metal and is very soft, with a silvery-white luster. Rubidium was discovered (1861) spectroscopically by German scientists Robert Bunsen and Gustav Kirchhoff and named

tumour suppressor gene: …mutations in a gene designated RB. Subsequent research revealed that mutations in this gene also play a role in cancers of the bone, lung, breast, cervix, prostate, and bladder. A number of other tumour suppressor genes (such as TP53, which encodes a protein known as p53) have been identified. The…

Rolls-Royce PLC: …new, powerful jet engine, the RB211. In order to beat its competitor General Electric, the company agreed to a fixed-price contract with Lockheed Aircraft Corporation (see Lockheed Martin Corporation) to supply the RB211 turbofan for Lockheed’s L-1011 TriStar wide-body airliner. Rolls-Royce management made several miscalculations in the process, including a…

sleep: Parasomnias: REM sleep behaviour disorder (RBD) is a disease in which the sleeper acts out the dream content. The main characteristic of the disorder is a lack of the typical muscle paralysis seen during REM sleep. The consequence is that the sleeper is no longer able…

radiation: Units for measuring ionizing radiation: …of radiation in terms of relative biologic effectiveness (RBE), since particulate radiations tend to cause greater injury for a given absorbed dose than do X rays or gamma rays. The dose equivalent of a given type of radiation (in Sv) is the dose of the radiation in Gy multiplied by…

The Reserve Bank of India (RBI) is the central bank of India, established in 1935 by the Reserve Bank of India Act (1934). Originally privately owned, the RBI was nationalized in 1949. The bank is headquartered in Mumbai and maintains offices throughout the country. The RBI formulates and

surface analysis: Ion scattering spectroscopy and Rutherford backscattering: Rutherford backscattering spectroscopy (RBS, named after British physicist Ernest Rutherford) operates on the same principle as ISS. A primary ion beam is elastically scattered, and the energy and angle of the scattered ion yield information about the mass of the scattering atom in the sample.…

Royal Bank of Scotland Group (RBS), in the United Kingdom, a bank and financial services company that became one of the largest in Europe through its acquisition of National Westminster Bank in 2000. Its headquarters are in Edinburgh, Scot. The Royal Bank of Scotland is the leading U.K. provider of

advanced ceramics: Reaction sintering: Reaction-bonded silicon carbide (RBSC) is produced from a finely divided, intimate mixture of silicon carbide and carbon. Pieces formed from this mixture are exposed to liquid or vapour silicon at high temperature. The silicon reacts with the carbon to form additional silicon carbide, which bonds…

advanced ceramics: Reaction sintering: Reaction-bonded silicon nitride (RBSN) is made from finely divided silicon powders that are formed to shape and subsequently reacted in a mixed nitrogen/hydrogen or nitrogen/helium atmosphere at 1,200 to 1,250 °C (2,200 to 2,300 °F). The nitrogen permeates the porous body and reacts with the…

rodeo: Origins and history: …(RCA) in 1945 and the Professional Rodeo Cowboys Association (PRCA) in 1975, and its rules became accepted by most rodeos.

skyscraper: …State Building (1931), and the RCA Building (1931) in New York City, which were then considered as modern as the new technology, are now viewed as more related to the old ornate decorations than to truly modern lines.

RCA Corporation, major American electronics and broadcasting conglomerate that is a unit of General Electric Company. Among its subsidiaries is the National Broadcasting Company (NBC). Headquarters are in New York City. RCA was founded as Radio Corporation of America by the General Electric Company

music synthesizer: The first electronic sound synthesizer, an instrument of awesome dimensions, was developed by the American acoustical engineers Harry Olson and Herbert Belar in 1955 at the Radio Corporation of America (RCA) laboratories at Princeton, New Jersey. The information was fed to the synthesizer encoded on a punched…

Chet Atkins was a respected guitarist and songwriter long before he was put in charge of RCA’s office in Nashville in 1957. Most producers took their cues from the prevailing prejudices at The Grand Ole Opry, the long-running live radio show on WSM, Nashville, which networked a traditional concept

RCA in Music City, U.S.A.: The Nashville Sound: Chet Atkins was a respected guitarist and songwriter long before he was put in charge of RCA’s office in Nashville in 1957. Most producers took their cues from the prevailing prejudices at The Grand Ole Opry, the long-running live radio show on WSM, Nashville, which…

RCA in Music City, U.S.A.: The Nashville Sound: Chet Atkins was a respected guitarist and songwriter long before he was put in charge of RCA’s office in Nashville in 1957. Most producers took their cues from the prevailing prejudices at The Grand Ole Opry, the long-running live radio show on WSM, Nashville, which…

television: Video discs: The RCA VideoDisc, which superficially resembled a long-playing phonograph record, was 300 mm (12 inches) in diameter and had spiral grooves that were read by a diamond stylus. The stylus had a metal coating and moved vertically in a hill-and-dale groove etched into the disc, thereby…

Royal Canadian Air Force (RCAF), Canadian armed force in charge of that nation’s air defense. Since its inception in 1924, the RCAF has served Canadians in peace and war. It played a vital role in the Second World War, becoming the fourth-largest Allied air force, and reached its “golden age” in

Cambodia: Security: …the armed forces, called the Royal Cambodian Armed Forces (RCAF), which include the army, navy, and air force. The RCAF was created in 1993 through the merger of the Cambodian government’s military forces and the two noncommunist resistance armies; the Khmer Rouge and royalist forces were absorbed into the RCAF…

Russia: Finance: The Russian Central Bank (RCB), which took over the functions of the Soviet-era Gosbank, is exclusively responsible for regulating the country’s monetary system. The bank’s primary function is to protect and stabilize the ruble, which it attempts to do through its control of foreign exchange. Under…

Iraq: Constitutional framework: …but also in the party-run Revolutionary Command Council (RCC), without whose approval no law could be promulgated. Executive power rested with the president, who also served as the chairman of the RCC, supervised the cabinet ministers, and ostensibly reported to the RCC. Judicial power was also, in theory, vested in…

Gaafar Mohamed el-Nimeiri: …minister and chairman of the Revolutionary Command Council (RCC). He put down a right-wing revolt led by Sayyid Ṣādiq al-Mahdī in March 1970 but was briefly overthrown by a communist coup in July 1971. In September 1971 he was elected president in a plebiscite with 98.6 percent of the vote.

Democratic Constitutional Rally (RCD), Tunisian political party that led the movement for independence from France (1956) and ruled Tunisia until 2011. The Neo-Destour was formed in 1934 by discontented young members of the more conservative Destour. After a bitter struggle with the parent

art conservation and restoration: Role of law: …Great Britain, for example, the Royal Commission on Historical Monuments (RCHM) was set up in 1908, and the Civic Amenities Act of 1967 enabled local planning authorities to define special areas for “conservation and enhancement.” In France, the Commission des Secteurs Sauvegardés was set up in 1962 under André Malraux,…

melanoma: Diagnosis and treatment: An approach known as reflectance confocal microscopy (RCM), sometimes described as “optical biopsy,” may be used to diagnose melanoma. RCM allows doctors to examine suspicious moles and skin abnormalities without cutting into the skin. Another diagnostic approach that does not entail cutting into the skin is adhesive patch testing,…

Royal Canadian Mounted Police (RCMP), Canada’s federal police force. It is also the provincial and criminal police establishment in all provinces except Ontario and Quebec and the only police force in the Yukon and Northwest territories. It is responsible for Canadian internal security as well.

Royal Canadian Navy (RCN), naval military organization of Canada, charged with the national defense at sea, protection of shipping, and fulfillment of international military agreements. Canada’s navy has defended Canadian interests in home waters and overseas since the early 20th century—despite

carboxylic acid, any of a class of organic compounds in which a carbon (C) atom is bonded to an oxygen (O) atom by a double bond and to a hydroxyl group (―OH) by a single bond. A fourth bond links the carbon atom to a hydrogen (H) atom or to some other univalent combining group. The carboxyl (COOH)

Royal Commission on the Press (RCP), any of three groups appointed by the government of the United Kingdom in the 20th century (1947–49; 1961–62; 1974–77) to investigate the issues of press standards and concentration of ownership and to make recommendations for improvements in those areas. Their

toxic waste: Laws: The Resource Conservation and Recovery Act (RCRA) became law in 1976 and regulated the safe handling and disposal of hazardous wastes, including those that occur in underground storage tanks. It created the “cradle-to-grave” (that is, from manufacture to final disposal) system to keep track of such…

evidence-based medicine: Best evidence: …generated by systematic reviews of randomized controlled trials (RCTs), which minimize bias and allow for causal interpretations of new interventions. Properly designed RCTs, in which study subjects are assigned by chance to either the new intervention or the standard treatment, themselves represent the next-most-reliable level of evidence. Below RCTs are…

rod, old English measure of distance equal to 16.5 feet (5.029 metres), with variations from 9 to 28 feet (2.743 to 8.534 metres) also being used. It was also called a perch or pole. The word rod derives from Old English rodd and is akin to Old Norse rudda (“club”). Etymologically rod is also akin

flag of Benin: …had been used by the African Democratic Rally—i.e., the legislators in the French National Assembly who represented French West Africa following World War II. The colours were also associated with Ethiopia, the oldest independent African state, and with the flags of contemporaneously independent Ghana (1957 flag design), Cameroon (1957), and…

therapeutics: General requirements: Recommended Dietary Allowances (RDAs), one of many sets of recommendations put out by various countries and organizations, have been established for these essential nutrients by the Food and Nutrition Board of the National Academy of Sciences. The RDAs are guidelines and not absolute minimums. Intake of less than…

insurance: RDC clause: The RDC, or “running down” clause, provides coverage for legal liability of either the shipper or the common carrier for claims arising out of collisions. (Collision loss to the vessel itself is part of the hull coverage.) The RDC clause covers negligence of…

dirty bomb, explosive device designed to scatter radioactive material, hence the adjective dirty. Unlike an atomic bomb’s explosive power, which comes from a nuclear chain reaction, the explosive energy of the dirty bomb comes from ordinary conventional explosives such as dynamite or TNT. When the

liquid: Molecular structure of liquids: …potential function, u, and the radial distribution function, g. The pair potential gives information about the energy due to the interaction of a pair of molecules and is a function of the distance r between their centres. Information about the structure or the distances between pairs of molecules is contained…

RSS, format used to provide subscribers with new content from frequently updated websites. An RSS feed is a set of instructions residing on the computer server of a website, which is given upon request to a subscriber’s RSS reader, or aggregator. The feed tells the reader when new material—such as

Janus Friis: Later ventures: In 2010 they created Rdio, a subscription-based music-streaming service. Rdio struggled, however, and in 2015 it was agreed that the service’s key assets would be sold to competitor Pandora for some $75 million. As part of the deal, Rdio also filed for bankruptcy protection. Friis’s later ventures included Starship…

vajra, five-pronged ritual object extensively employed in Tibetan Buddhist ceremonies. It is the symbol of the Vajrayāna school of Buddhism. Vajra, in Sanskrit, has both the meanings of “thunderbolt” and “diamond.” Like the thunderbolt, the vajra cleaves through ignorance. The thunderbolt was

Côte d’Ivoire: Return to normalcy: Also in 2018, Ouattara’s RDR and most of the other parties in the ruling RHDP coalition agreed to transform the coalition into a new party. Bédié’s PDCI rejected the proposal, however, largely because the RDR had dismissed the PDCI’s insistence that it was the PDCI’s turn to field the…

Tsar Bomba, Soviet thermonuclear bomb that was detonated in a test over Novaya Zemlya island in the Arctic Ocean on October 30, 1961. The largest nuclear weapon ever set off, it produced the most powerful human-made explosion ever recorded. The bomb was built in 1961 by a group of Soviet physicists

nuclear weapon: Thermonuclear weapons: Known in the West as Joe-19 and RDS-37 in the Soviet Union, the thermonuclear bomb was dropped from a bomber at the Semipalatinsk (now Semey, Kazakhstan) test site. As recounted by Sakharov, this test “crowned years of effort [and] opened the way for a whole range of devices with remarkable…

nuclear weapon: Thermonuclear weapons: …known in the West as Joe-4 and in the Soviet Union as RDS-6, was detonated on August 12, 1953, with a yield of 400 kilotons. Significantly, it was a deliverable thermonuclear bomb—a milestone that the United States would not reach until May 20, 1956—and also the first use of solid…

RDX, powerful explosive, discovered by Georg Friedrich Henning of Germany and patented in 1898 but not used until World War II, when most of the warring powers introduced it. Relatively safe and inexpensive to manufacture, RDX was produced on a large scale in the United States by a secret process

Re, in ancient Egyptian religion, god of the sun and creator god. He was believed to travel across the sky in his solar bark and, during the night, to make his passage in another bark through the underworld, where, in order to be born again for the new day, he had to vanquish the evil serpent

rhenium (Re), chemical element, a very rare metal of Group 7 (VIIb) of the periodic table and one of the densest elements. Predicted by the Russian chemist Dmitry Ivanovich Mendeleyev (1869) as chemically related to manganese, rhenium was discovered (1925) by the German chemists Ida and Walter

Chengde: …northeast of Beijing, on the Re River (Re He; “Hot River”), a small tributary of the Luan River. The Re River, so called because of the various hot springs that discharge into it above Chengde, gave its name to the city and to the province of which the city was…

Ré Island, island in the Bay of Biscay, Charente-Maritime département, Poitou-Charentes région of France. It is located off the west coast of France, opposite La Pallice and La Rochelle. It was for long separated from the mainland by the shallow water of Pertuis Breton, 2 miles (3.2 km) wide at the

Francesco Borromini: Later years and influence: For the Re Magi chapel in the Collegio di Propaganda Fide, on which he worked until his death, he designed six pairs of colossal pilasters to define a generally rectangular space with bevelled corners.

Chengde: …northeast of Beijing, on the Re River (Re He; “Hot River”), a small tributary of the Luan River. The Re River, so called because of the various hot springs that discharge into it above Chengde, gave its name to the city and to the province of which the city was…

Re, in ancient Egyptian religion, god of the sun and creator god. He was believed to travel across the sky in his solar bark and, during the night, to make his passage in another bark through the underworld, where, in order to be born again for the new day, he had to vanquish the evil serpent

G. Gordon Liddy: Career: …went to work for the Committee to Reelect the President (also known as CREEP), for which he organized “dirty tricks” aimed primarily at undermining the Democratic Party.

ancient Egyptian religion: The Gods: …were Khepri (the morning form), Re-Harakhty (a form of Re associated with Horus), and Atum (the old, evening form). There were three principal “social” categories of deity: gods, goddesses, and youthful deities, mostly male.

ancient Egyptian religion: The Gods: …were Khepri (the morning form), Re-Harakhty (a form of Re associated with Horus), and Atum (the old, evening form). There were three principal “social” categories of deity: gods, goddesses, and youthful deities, mostly male.

Sherrie Levine: …either through photographic reproductions (termed re-photography), drawing, watercolour, or sculpture. Her appropriations are conceptual gestures that question the Modernist myths of originality and authenticity. She held that the loss of authenticity in art was a result of the ubiquitous mediated signs that defined contemporary reality and that it was impossible…

whole genome sequencing: Next-generation technologies: …technologies originally were designed to re-sequence genomes (as opposed to de novo sequencing). In re-sequencing, short sequences are produced and aligned computationally to existing reference genome sequences generated, at least initially, using the older de novo sequencing methods. Next-generation sequencing approaches are characterized generally by the massively parallel production of…

National Party (NP), South African political party, founded in 1914, which ruled the country from 1948 to 1994. Its following included most of the Dutch-descended Afrikaners and many English-speaking whites. The National Party was long dedicated to policies of apartheid and white supremacy, but by

Nikki Giovanni: … (1968), Black Judgement (1968), and Re: Creation (1970), her content was urgently revolutionary and suffused with deliberate interpretation of experience through a Black consciousness.

United States: Agricultural recovery: …creation in 1935 of the Rural Electrification Administration (REA), which did more to bring farmers into the 20th century than any other single act. Thanks to the REA, nine out of 10 farms were electrified by 1950, compared to one out of 10 in 1935.

REA Express, Inc., American company that at one time operated the nation’s largest ground and air express services, transporting parcels, money, and goods, with pickup and delivery. American Railway Express Company was established by the U.S. government in 1918, during World War I, at the same time

Brian Friel: …1980 Friel cofounded (with actor-director Stephen Rea) the Field Day Theatre Company in Londonderry, Northern Ireland, and in 1983 the company began publishing pamphlets, and later anthologies, aimed at the academic community on a wide variety of historical, cultural, and artistic topics. He was elected Saoi of Aosdána, Ireland’s highest…

excretion: Mammals: …formation involves three processes: filtration, reabsorption, and secretion. Primary urine is formed by filtration from the blood. From this primary urine certain substances are reabsorbed into the blood and other substances are secreted into the primary urine from the blood. The word secretion is used by renal physiologists to imply…

Edmund Goulding: The 1930s: …The Devil’s Holiday (1930) and Reaching for the Moon (1930), the latter an ur-screwball comedy starring Douglas Fairbanks as a Wall Street millionaire who courts an aviator (Bebe Daniels) during an ocean voyage. The Night Angel (1931) came next, but it was Grand Hotel (1932) that established Goulding as one…

reactance, in electricity, measure of the opposition that a circuit or a part of a circuit presents to electric current insofar as the current is varying or alternating. Steady electric currents flowing along conductors in one direction undergo opposition called electrical resistance, but no

chemical reaction: …one or more substances, the reactants, are converted to one or more different substances, the products. Substances are either chemical elements or compounds. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.

chemical reaction, a process in which one or more substances, the reactants, are converted to one or more different substances, the products. Substances are either chemical elements or compounds. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as

turbine: Blading design: …of perfection: impulse blading and reaction blading. The principle of impulse blading is illustrated in the schematic diagram of Figure 1 for a first stage. A series of stationary nozzles allows the steam to expand to a lower pressure while its velocity and kinetic energy increase. The steam is then…

advanced ceramics: Reaction sintering: Reaction sintering, or reaction bonding, is an important means of producing dense covalent ceramics. Reaction-bonded silicon nitride (RBSN) is made from finely divided silicon powders that are formed to shape and subsequently reacted in a mixed nitrogen/hydrogen or nitrogen/helium atmosphere at 1,200 to…

Robert Huber: …a protein complex (called a photosynthetic reaction centre) that is essential to photosynthesis in certain bacteria. By 1985 the three scientists had succeeded in describing the complete atomic structure of the protein. Although bacterial photosynthesis is somewhat simpler than that carried on by plants, the scientists’ work significantly increased the…

Robert Huber: …a protein complex (called a photosynthetic reaction centre) that is essential to photosynthesis in certain bacteria. By 1985 the three scientists had succeeded in describing the complete atomic structure of the protein. Although bacterial photosynthesis is somewhat simpler than that carried on by plants, the scientists’ work significantly increased the…

cross section, in nuclear or subatomic particle physics, probability that a given atomic nucleus or subatomic particle will exhibit a specific reaction (for example, absorption, scattering, or fission) in relation to a particular species of incident particle. Cross section is expressed in terms of

chemical kinetics: Molecular dynamics: The second theoretical approach to chemical kinetics is referred to as molecular dynamics, or reaction dynamics. It is a more detailed treatment of reactions and is designed to investigate the atomic motions that occur during a chemical reaction and the quantum states of…

reaction formation, in the field of psychoanalysis, a defense mechanism wherein an anxiety-producing impulse is replaced by an opposite idea or behaviour. Reaction formation was first conceptualized by Austrian-born British psychoanalyst Anna Freud; it was one of 10 types of defense mechanisms