| | - QQQ 1432
- (from the article "Physical Sciences") ...few had been found to form pairs and orbit each other. An American-Swiss team of astronomers led by George Djorgovski of Caltech discovered for the first time a triple quasar system, which was named QQQ 1432. The three quasars in ...
- QSL process
- (from the article "metallurgy") Two newer processes for the direct reduction of unroasted lead sulfide concentrate are the QSL (Queneau-Schuhmann-Lurgi) and the KIVCET (a Russian acronym for "flash-cyclone-oxygen-electric smelting"). In the QSL reactor a submerged injection of shielded oxygen oxidizes lead sulfide to lead ...
- qu
- (from the article "China") ...wide-reading public, and dramatic literature reached such a peak in Yuan China that later literary criticism regarded the Yuan as the classical age for operatic arias, or qu (a word that is also used for a full ...
- qu di
- (from the article "di") ...xiao) flutes as well but is now used exclusively for transverse flutes. There are two major types of di: the qu di, so named because it is used to accompany kunqu, ...
- Qu Qiubai
- prominent leader and, on occasions in the 1920s and early 1930s, head of the Chinese Communist Party. In addition to being a political activist, he is considered one of the most important literary figures of 20th-century China. In the People's ...
- Qu Yinhua
- (from the article "Everest, Mount") ...Ridge route earlier explored by prewar British expeditions. Many in the West doubted the Chinese assertion, mainly because the official account-which included the claim that Qu Yinhua had scaled the notorious vertical cliff of the Second Step barefoot and which ...
- Qu Yuan
- one of the greatest poets of ancient China and the earliest known by name. His highly original and imaginative verse had an enormous influence over early Chinese poetry. [1 Related Articles]
- Qu'aiti
- (from the article "Qu'aiti sultanate") ...Gulf of Aden coast and much of the Hadramawt, an inland region extending northward to the Rub' al-Khali, the southern Arabian Desert. The sultanate was founded when the powerful Qu'aiti tribe arose early in the 19th century, challenging the dominant ...
- Qu'aiti sultanate
- former semi-independent state in the southern Arabian Peninsula, in what is now Yemen. It was one of the largest sultanates in the British-ruled Aden Protectorate, the forerunner of independent southern Yemen; its capital was the port of Al-Mukalla. Its territory ... [1 Related Articles]
- Qu'Appelle River
- tributary of the Assiniboine River, in southern Saskatchewan and southwestern Manitoba, Canada. From its source near The Elbow (a bend in the South Saskatchewan River) and Lake Diefenbaker, northwest of Moose Jaw, Sask., the river flows eastward for 270 miles ...
- Qu'ayq'an, Mount
- (from the article "Mecca") ...is surrounded by the Sirat Mountains, the peaks of which include Mount (Jabal) Ajyad, which rises to 1,332 feet, and Mount Abu Qubays, which attains 1,220 feet, to the east and Mount Qu'ayq'an, which reaches 1,401 feet, to the west. ...
- Quabbin Reservoir
- (from the article "Massachusetts") The Boston metropolitan area gets its drinking water from Quabbin Reservoir in the western part of the state. The world's largest man-made domestic water supply, it was built between 1933 and 1939 and required the displacement of 2,500 people and ...
- quack grass
- rapidly spreading grass of the family Poaceae. It has flat, somewhat hairy leaves and erect flower spikes; the plant may grow from 30 to 100 cm (about 12 to 40 inches) high. It is native to Europe and has been ...
- quad
- unit of energy equal to 1 quadrillion (1015) British thermal units (BTU). The quad is a convenient unit for describing national and world energy resources. One quad is also equal to 293 billion kilowatt hours, or, for fuels of average ...
- Quad Cities
- (from the article "Quad Cities") complex of cities at the Iowa-Illinois border, on the Mississippi River, U.S. Despite its name, the region includes five main cities: Rock Island, Moline, and East Moline, Illinois, and Davenport and Bettendorf, Iowa. There are also several smaller contiguous communities.for ...
- Quadi
- (from the article "Czechoslovak region, history of") The earliest known inhabitants of Moravia were the Boii and the Cotini, another Celtic tribe. These were succeeded about 15-10 BC by the Germanic Quadi. The Germanic peoples were pushed back from the middle Danube by the coming of the ...
- quadrangle
- in architecture, rectangular open space completely or partially enclosed by buildings of an academic or civic character. The grounds of a quadrangle are often grassy or landscaped. Such a quadrangular area, intended as an environment for contemplation, study, or relaxation, ...
- quadrant
- (from the article "Hadley, John") In 1730, independently of Thomas Godfrey of Philadelphia, Hadley invented a quadrant (actually a double-reflecting octant) for measuring the altitude of the Sun or a star above the horizon to find geographic position at sea. His double-reflecting principle made accurate ...
- Quadrapartite Cartel
- (from the article "Novartis AG") ...also established or acquired factories in various European countries and in the United States. In 1929-32 the Basel IG joined with IG Farben and French and British chemical firms to form the Quadrapartite Cartel, which lasted until the outbreak of ...
- quadrata
- (from the article "paleography") The ancient Latin alphabet of capitals (quadrata) is found in numberless inscriptions in stone and marble all over the Roman world. How far this alphabet was used for writing books is uncertain, because, though excellently adapted for incision, it is ...
- quadrate bone
- (from the article "sound reception") ...sensitive to some airborne sound waves and are able to receive them through a mechanism that serves as a substitute for the tympanic membrane. This mechanism consists of a thin plate of bone (the quadrate bone) that was once a ...
- quadratic equation
- in mathematics, an algebraic equation of the second degree (having one or more variables raised to the second power). Old Babylonian cuneiform texts, dating from the time of Hammurabi, show a knowledge of how to solve quadratic equations, but it ... [4 Related Articles]
- quadratic form
- (from the article "mathematics") ...it was left to Lagrange to provide a general theory covering all expressions of the form ax2 + bxy + cy2, quadratic forms, as they are called.
- quadratic mean
- (from the article "mean") ...1, 1, 2, 5, and 7 cm. Their average area is (12 + 12 + 22 + 52 + 72)/5, or 16 square cm, the area of a square of side 4 cm. The number 4 is the quadratic mean ...
- quadratic programming problem
- (from the article "optimization") ...problems the graph of the objective function and the feasible set are both convex (where a set is convex if a line joining any two points in the set is contained in the set). Another special case is quadratic programming, ...
- quadratic reciprocity law
- (from the article "number theory") ...factors is "one of the most important and useful in arithmetic," Gauss provided the first modern proof of the unique factorization theorem. He also gave the first proof of the law of quadratic reciprocity, a deep result previously glimpsed by ...
- quadratrix of Hippias
- (from the article "Trisecting the Angle: The Quadratrix of Hippias") Hippias of Elis (fl. 5th century BC) imagined a mechanical device to divide arbitrary angles into various proportions. His device depends on a curve, now known as the quadratrix of Hippias, that is produced by plotting the intersection of two ...
- quadratura
- (from the article "Peruzzi, Baldassarre") Sienese architect and painter, one of the earliest artists to attempt illusionist architectural painting (quadratura), the extension of real architecture into imaginary space.
- quadrature
- in astronomy, that aspect of a heavenly body in which its direction as seen from the Earth makes a right angle with the direction of the Sun. The Moon at First or Last Quarter is said to be at east ...
- quadrature
- in mathematics, the process of determining the area of a plane geometric figure by dividing it into a collection of shapes of known area (usually rectangles) and then finding the limit (as the divisions become ever finer) of the sum ... [2 Related Articles]
- quadrature amplitude modulation
- (from the article "telecommunication") ...forms of digital modulation described above, there exist more advanced methods that result from a superposition of multiple modulating signals. An example of the latter form of modulation is quadrature amplitude modulation (QAM). QAM signals actually transmit two amplitude-modulated signals ...
- quadrature of the lune
- (from the article "Quadrature of the Lune") Hippocrates of Chios (fl. c. 460 BC) demonstrated that the moon-shaped areas between circular arcs, known as lunes, could be expressed exactly as a rectilinear area, or quadrature. In the following simple case, two lunes developed around the sides of ...
- Quadratus, Saint
- the earliest known Apologist for Christianity. [1 Related Articles]
- quadric surface
- (from the article "quadratic equation") More general quadratic equations, in the variables x, y, and z, lead to generation (in Euclidean three-dimensional space) of surfaces known as the quadrics, or quadric surfaces.
- quadriceps femoris muscle
- large fleshy muscle group covering the front and sides of the thigh. It has four parts: rectus femoris, vastus lateralis, vastus medialis, and vastus intermedius. They originate at the ilium (upper part of the pelvis, or hipbone) and femur (thighbone), ... [2 Related Articles]
- quadrifoil
- (from the article "kite") ...sail while simultaneously navigating a moving vehicle such as a land buggy that can reach speeds approaching 50 miles (80 km) per hour. Modern kite traction has also revolutionized polar travel. Quadrifoils-soft, sparless, controllable kites-were used to haul personnel and ...
- quadrigatus
- (from the article "coin") ...to the Second Punic War, terminating in a new issue of silver coins of Roman style and types (marked ROMA), including Jupiter in a quadriga (four-horse chariot) from which their name, quadrigati, derived; they were imitated in electrum by the ...
- Quadrilateral
- (from the article "Christianity") ...apostolic principles." Among Episcopalians, the visionaries for unity included Thomas Hubbard Vail, William Augustus Muhlenberg, and William Reed Huntington, who proposed the historic "Quadrilateral" of the Scriptures, the creeds, the sacraments of baptism and the Lord's Supper, and episcopacy as ...
- Quadrilateral
- famous combination of four fortresses mutually supporting one another, during the Austrian rule of northern Italy. The four fortified towns were Mantua, Peschiera, Verona, and Legnago, lying between Lombardy and Venetia; the former two were on the Mincio and the ...
- quadrille
- (from the article "ombre") ...its being the first game in which a trump was established by bidding rather than by the random process of turning the last card dealt. In the 18th century the French developed a four-hand version, quadrille. Quadrille in turn adopted ...
- quadrille
- fashionable late 18th- and 19th-century dance for four couples in square formation. Imported by English aristocrats in 1815 from elite Parisian ballrooms, it consisted of four, or sometimes five, contredanses; like the contredanse (q.v.), the quadrille depended more on the ... [1 Related Articles]
- quadrille flageolet
- (from the article "flageolet") A popular amateur instrument, it also occupied in the 18th-century orchestra (as the flauto piccolo) the role now held by the modern piccolo. With keywork added it became the popular quadrille flageolet of the mid-19th century, made famous by the ...
- quadriplegia
- (from the article "paraplegia") ...be caused by injury to or disease of the lower spinal cord or peripheral nerves or by such brain disorders as cerebral palsy. Some paraplegics are able to walk with the aid of braces and crutches. Quadriplegia involves paralysis of ...
- quadrivium
- (from the article "mathematics") ...was well known and was the means by which medieval scholars learned of Pythagorean number theory. Boethius and Cassiodorus provided the material for the part of the monastic education called the quadrivium: arithmetic, geometry, astronomy, and music theory. Together with ...
- Quadros, Janio da Silva
- Brazilian politician who unexpectedly resigned the presidency after serving only seven months (Jan. 31-Aug. 25, 1961). A colourful and sometimes eccentric populist, he campaigned with a broom as a symbol of his pledge to "sweep out corruption." [2 Related Articles]
- Quadrumviri
- (from the article "Mussolini, Benito") ...that day, Mussolini and other leading Fascists decided that four days later the Fascist militia would advance on Rome in converging columns led by four leading party members later to be known as the Quadrumviri. Mussolini himself was not one ...
- quadrupedalism
- (from the article "human evolution") Although we are bipedal, our pelvis is oriented like that of quadrupedal primates. The early bipedal hominins assumed erect trunk posture by bending the spine upward, particularly in the lower back (lumbar region). In order to transfer full upper-body mass ...
- Quadruple Alliance
- alliance formed Aug. 2, 1718, when Austria joined the Triple Alliance of Britain, the Dutch Republic (United Provinces), and France to prevent Spain from altering the terms of the Treaty of Utrecht (1713). Philip V of Spain, influenced by his ... [2 Related Articles]
- Quadruple Alliance
- alliance formed on April 22, 1834, between Britain, France, and the more liberal claimants to the thrones of Spain and Portugal against the conservative claimants to those thrones. The alliance successfully supported Maria Cristiana, who was acting as regent for ... [2 Related Articles]
- Quadruple Alliance
- alliance first formed in 1813, during the final phase of the Napoleonic Wars, by Britain, Russia, Austria, and Prussia, for the purpose of defeating Napoleon, but conventionally dated from Nov. 20, 1815, when it was officially renewed to prevent recurrence ... [3 Related Articles]
- quadruple bond
- (from the article "chemical bonding") Metal cluster compounds warrant a special mention here because they provide the only examples of quadruple bonds in chemistry. Apart from that, their bonding can be treated as a straightforward exercise in MO or VB theory. Indeed, a metal cluster ...
|
|
