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Papineau, Louis-Joseph (Canadian politician)
politician who was the radical leader of the French-Canadians in Lower Canada (now in Quebec) in the period preceding an unsuccessful revolt against the British government in 1837....
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Papineau-Couture, Jean (Canadian composer)
Canadian composer (b. Nov. 12, 1916, Outremont, Que.—d. Aug. 11, 2000, Montreal, Que.), was one of the country’s foremost contemporary music composers and was highly influential as a teacher at the Collège Jean-de-Brébeuf, the Conservatoire de musique de Montréal, and the University of Montreal, where he served (1968–73) as dean before retiring as professo...
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Papini, Giovanni (Italian author)
journalist, critic, poet, and novelist, one of the most outspoken and controversial Italian literary figures of the early and mid-20th century. He was influential first as a fiercely iconoclastic editor and writer, then as a leader of Italian Futurism, and finally as a spokesman for Roman Catholic religious belief....
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Papinian (Roman jurist)
Roman jurist who posthumously became the definitive authority on Roman law, possibly because his moral high-mindedness was congenial to the worldview of the Christian rulers of the postclassical empire....
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Papinianus (work by Gryphius)
...of the time, borders on despair. He wrote five tragedies: Leo Armenius (1646), Catharina von Georgien, Carolus Stuardus, and Cardenio und Celinde (all printed 1657), and Papinianus (1659). These plays deal with the themes of stoicism and religious constancy unto martyrdom, of the Christian ruler and the Machiavellian tyrant, and of illusion and reality, a theme......
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Papio (mammal)
any of five species of large, robust, and primarily terrrestrial monkeys found in dry regions of Africa and Arabia. Males of the largest species, the chacma baboon (Papio ursinus), average 30 kg (66 pounds) or so, but females are only half this size. The smallest is the h...
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Papio anubis (primate)
...south of the Zambezi River, is brown or blackish in colour. The much smaller yellow baboon (P. cynocephalus) is found from the Zambezi northward to the Kenya coast and Somalia. The anubis, or olive baboon (P. anubis), is only slightly smaller than the chacma and olive in colour; the male has a large mane of hair over the head and shoulders. The ......
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Papio comatus (primate)
species of baboon....
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Papio hamadryas (primate)
large, powerful monkey of the plains and open-rock areas of the Red Sea coast, both in Africa (Eritrea, The Sudan) and on the opposite coast in Yemen and Saudi Arabia. The hamadryas is the smallest baboon species, ...
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Papio papio (primate)
...from the hinterland of Kenya and Ethiopia through the grasslands and Sahel westward to Mali. It is also found in the less-arid highlands of the Sahara, such as Tibesti and Aïr. The small red Guinea baboon (P. papio) is restricted to far western Africa, and males have a cape of hair. These four species are often referred to......
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Papio ursinus (primate)
species of baboon....
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Papirofsky, Joseph (American producer and director)
American theatrical producer and director, founder of the New York Shakespeare Festival and the Public Theatre. He was a major innovative force in the American theatre in the second half of the 20th century....
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“Pápissa Ioánna, I” (work by Roídis)
...a glorious picture of the Greek past while novels set in the present tended to be satirical or picaresque in nature. Emmanuel Roídis’ novel I Pápissa Ioánna (1866; Pope Joan) is a hilarious satire on medieval and modern religious practices as well as a pastiche of the historical novel. Pávlos Kalligás, in Thános Vlékas...
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Papke, Billy (American boxer)
In Los Angeles on September 7, 1908, Ketchel faced Billy Papke in a title match. As Ketchel stepped forward to shake hands (touch gloves) with his opponent, Papke sucker punched Ketchel and staggered him. Ketchel never recovered and was badly beaten in the 1st round, although he managed to hold on until he was knocked out in the 12th round. In San Francisco on November 26, Ketchel was primed......
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Papon, Maurice-Arthur-Jean (French bureaucrat)
French bureaucrat who as a high-ranking local official (1942–44) in Gironde under France’s pro-Nazi Vichy government, authorized the arrest and deportation of more than 1,600 Jews (including 223 children), most of whom died in concentration camps. After World War II, Papon held a series of government posts, including prefect of police in Paris (1958–66) and federal budget min...
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Papovaviridae (virus group)
any of a group of viruses constituting the family Papovaviridae, which is divided into two subgroups: the papillomaviruses and the polyomaviruses. Papovaviruses are responsible for a variety of abnormal growths in animals: warts (papillomas) in humans, dogs, and other animals; cervical cancer...
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papovavirus (virus group)
any of a group of viruses constituting the family Papovaviridae, which is divided into two subgroups: the papillomaviruses and the polyomaviruses. Papovaviruses are responsible for a variety of abnormal growths in animals: warts (papillomas) in humans, dogs, and other animals; cervical cancer...
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Papp, Joseph (American producer and director)
American theatrical producer and director, founder of the New York Shakespeare Festival and the Public Theatre. He was a major innovative force in the American theatre in the second half of the 20th century....
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Papp, László (Hungarian athlete)
Hungarian boxer who became the first three-time Olympic boxing champion, winning gold medals in 1948, 1952, and 1956....
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pappataci fever (pathology)
acute, infectious, febrile disease caused by a phlebovirus (family Bunyaviridae) and producing temporary incapacitation. It is transmitted to humans by the bloodsucking female sand fly (notably Phlebotomus papatasii, P. perniciosus, and P. perfiliewsi) and is prevalent in the moist subtropical...
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Pappenheim, Bertha (Austrian psychiatric patient)
...the office he established at Berggasse 19 was to remain his consulting room for almost half a century. Before their collaboration began, during the early 1880s, Breuer had treated a patient named Bertha Pappenheim—or “Anna O.,” as she became known in the literature—who was suffering from a variety of hysterical symptoms. Rather than using hypnotic suggestion, as had....
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Pappenheim, Gottfried Heinrich, Graf zu (German officer)
German cavalry commander conspicuous early in the Thirty Years’ War....
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pappus (plant anatomy)
...parts are attached to the top of the ovary rather than beneath it. The calyx (sepals) of Asteraceae is so highly modified, in contrast to that of other orders, that it is given a different name, the pappus. The pappus consists of one to usually several or many dry scales, awns (small pointed processes), or capillary (hairlike) bristles; in some the scales may be joined by their margins to form ...
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Pappus of Alexandria (Greek mathematician)
the most important mathematical author writing in Greek during the later Roman Empire, known for his Synagoge (“Collection”), a voluminous account of the most important work done in ancient Greek mathematics. Other than that he was born at Alexandria in Egypt and that his career coincided with the first three decades of the 4th century ...
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Pappus’s projective theorem (geometry)
The following theorem is of fundamental importance for projective geometry. In its first variant, by Pappus of Alexandria (fl. ad 320) as shown in the figure, it only uses collinearity:Let the distinct points A, B, C and D, E, F be on two different lines. Then the three intersection points—x of AE and.....
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Pappus’s theorem (geometry)
in mathematics, theorem named for the 4th-century Greek geometer Pappus of Alexandria that describes the volume of a solid, obtained by revolving a plane region D about a line L not intersecting D, as the product of the area of D and the length of the circular path traversed by the centroid of D during the revolution. To Pappus’s theore...
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paprika (spice)
spice made from the pods of Capsicum annuum, an annual shrub belonging to the nightshade family, Solanaceae, and native to tropical areas of the Western Hemisphere, including Mexico, Central America, ...
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“Papst und das Konzil, Der” (work by Döllinger)
In 1869 Döllinger wrote a series of articles, later enlarged and published as Der Papst und das Konzil (1869; The Pope and the Council), under the pen name Janus. This book, which criticized the Vatican Council and the doctrine of infallibility, immediately was placed on the Vatican’s Index of Forbidden Books...
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Papua (province, Indonesia)
propinsi (province), Indonesia, the western half of the island of New Guinea and its offshore islands—including the individual islands of Yapen, Adi, Waigeo, Batanta, Kofiau, Salawati, Misool, and Yos Sudarsa and the Schouten ...
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Papua Barat (province, Indonesia)
...a physiographic structure similar to those of the Sunda Shelf. They include the northern Moluccas and New Guinea. The western portion of New Guinea consists of the Indonesian provinces of Papua and West Papua (Papua Barat), which together account for more than one-fifth of the total area of Indonesia but are home to only a tiny percentage of the country’s population. The two provinces co...
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Papua, Gulf of (gulf, Pacific Ocean)
inlet of the Coral Sea (southwestern Pacific Ocean) indenting the southeast coast of the island of New Guinea. About 225 miles (360 km) wide, it extends 95 miles (150 km) into south-central New Guinea. From west to east it is entered...
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Papua New Guinea
Island country, southwestern Pacific Ocean....
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Papua New Guinea, flag of
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Papua New Guinea, University of (university, Port Moresby, Papua New Guinea)
The growth of written literature did not begin in earnest until after the establishment of the University of Papua New Guinea (1965) and the University of the South Pacific (1968). The most significant works have been written in English and have come from the regions served by the two universities (Papua New Guinea and the Cook Islands,......
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Papuan (people)
...it has not been uncommon for such personal belongings as weapons or bowls to be destroyed after the death of the owner in order to protect the survivors from being molested by his spirit. Among the Papua of New Guinea and the Damara (Bergdama) of Namibia, the hut of the dead man was abandoned or burned down so as to ban the magic of the......
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Papuan languages
group of languages spoken in New Guinea and its surrounds. The area includes the entire island of New Guinea and the offshore islands of New Britain, New Ireland, Yapen, and Biak, as well as the adjoining areas of eastern Indonesia, especially the islands of Timor, ...
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papule (anatomy)
Pseudoxanthoma elasticum, also known as Grönblad-Strandberg syndrome, primarily affects the skin, eyes, and blood vessels. The word pseudoxanthoma refers to the yellowish papules (pimplelike protuberances) that occur most commonly in the folds of the skin of the neck, armpits, and groin. The colour results from the thickening and fragmentation of elastic fibres in the deep......
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Papyri, Villa of the (villa, Herculaneum, Italy)
...be the ancient basilica of Herculaneum, and a large number of bronze and marble works of art were recovered from a suburban villa, called the Villa of the Papyri because of its having contributed a whole library of ancient papyri in Greek. These papyri, on philosophical subjects of Epicurean inspiration, are preserved in the National......
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papyrology
the care, reading, and interpretation of ancient documents written on papyrus, which is of prime importance in Egyptian, Middle Eastern, and Classical archaeology....
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papyrus (writing material)
writing material of ancient times and also the plant from which it was derived, Cyperus papyrus (family Cyperaceae), also called paper plant. The papyrus plant was long-cultivated in the Nile delta region in Egypt and was collected for its stalk or stem, whose central pith was cut into thin strips, pressed together, and dried to form a...
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papyrus (plant)
writing material of ancient times and also the plant from which it was derived, Cyperus papyrus (family Cyperaceae), also called paper plant. The papyrus plant was long-cultivated in the Nile delta region in Egypt and was collected for its stalk or stem, whose central pith was cut into thin strips, pressed together, and dried to......
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Papyrus Bodmer II (biblical literature)
...papyri are p66, p48, p72, p75, and p74. P66, also known as Papyrus Bodmer II, contains in 146 leaves (some having lacunae) almost all of the Gospel According to John, including chapter 21. This codex, written before 200, is thus merely one century removed......
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papyrus column (Egyptian religion)
in Egyptian religion, amulet that conveyed freshness, youth, vigour, and the continuance of life to its wearer. The amulet, made of glazed ware or various types of stone, was shaped like a papyrus stem and bud. Its significance was perhaps derived from its ideographic value (Egyptian wadj...
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papyrus roll (ancient book)
The papyrus roll of ancient Egypt is more nearly the direct ancestor of the modern book than is the clay tablet. Papyrus as a writing material resembles paper. It was made from a reedy plant of the same name that flourishes in the Nile Valley. Strips of papyrus pith laid at right angles on top of each other and pasted together made cream-coloured papery sheets. Although the sheets varied in......
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Paqari-tampu (shrine, Peru)
...the generations by official “memorizers” and from the written records composed from them after the Spanish conquest. According to their tradition, the Inca originated in the village of Paqari-tampu, about 15 miles (24 km) south of Cuzco. The founder of the Inca dynasty, Manco Capac, led the tribe to settle in Cuzco, which remained thereafter their capital. Until the reign of the.....
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paqarina (Andean shrine)
Several of the modern Andean peoples trace their ancestries to mythical figures who emerged from holes in the ground. These places of origin, or paqarina, were regarded as shrines, where religious ceremonies had to be performed. The Inca paqarina was located at Paqari-tampu (Paccari Tampu), about 15 miles south of Cuzco. There are three caves at Paqari-tampu, and the founders of......
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“Paquebot Tenacity, Le” (play by Vildrac)
...(1914–20) (1920; “Songs of a Desperate Man”) expresses anguish at the horrors of war. Vildrac’s best-known play, Le Paquebot Tenacity (produced, 1920; S.S. Tenacity), is a character study of two former soldiers about to immigrate to Canada. Michel Auclair (1921) revolves around the loyalty of a man to a woman who has rejected him. La......
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Paquette Habana (United States law)
...its ratification; since then the ruling has been consistently applied by other courts in the United States. In contrast, customary international law was interpreted as part of federal law in the Paquette Habana case (1900), in which the U.S. Supreme Court ruled that international law forbade the U.S. Navy from selling, as prizes of war, Cuban fishing vessels it had seized. Domestic......
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Paquier, Claudius Innocentius du (Dutch potter)
ceramic ware made at the Vienna factory in Austria between 1719 and 1864. Claudius Innocentius du Paquier (d. 1751), a Dutchman, began making porcelain there with the help of two workmen from Meissen in Germany. In 1744 he sold the enterprise to the Austrian state. After a succession of different directors, Konrad von Sorgenthal took over the direction in 1784. After Sorgenthal’s death in....
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Paquin, Anna (Canadian actress)
ceramic ware made at the Vienna factory in Austria between 1719 and 1864. Claudius Innocentius du Paquier (d. 1751), a Dutchman, began making porcelain there with the help of two workmen from Meissen in Germany. In 1744 he sold the enterprise to the Austrian state. After a succession of different directors, Konrad von Sorgenthal took over the direction in 1784. After Sorgenthal’s death in....
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PAR (British government)
...to existing procedures, was applied to some programs on a selective basis but never had the impact its designers envisaged. A similar attempt was made in the United Kingdom in the introduction of program analysis reviews (PAR), but again attempts to evaluate systematically the whole of government expenditure were unsuccessful. The degree of inertia in the system and the vested interests of......
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par (golf)
Every course has a par, which is defined as the score an expert (i.e., a scratch player) would be expected to make, and many courses also have a bogey, which is defined as the score that a moderately good golfer would be expected to make. Both par and bogey are further defined as errorless play without flukes and under ordinary weather conditions, allowing two strokes on the......
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par condicio creditorum (law)
One of the cardinal principles governing the liquidation of insolvent estates is the equal treatment of creditors—the classical par condicio creditorum. Debtors on the eve of bankruptcy, either of their own volition or under pressure, may accord preferential treatment—by way of payment or security—to certain creditors. The bankruptcy laws of most, if not all, countries....
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Par fil spécial (work by Baillon)
...En Sabots (1922; “In Wooden Shoes”), the novel that first drew the attention of the French critics, is based on Baillon’s stay in the Flemish village of Westmalle. Par fil spécial (1924; “By Special Cable”) is a sardonic account of the world of journalism based on his own experiences as a newspaper editor. In Un Homme si ...
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Par les champs et par les grèves (work by Flaubert)
...he had made as a law student. The pages written by Flaubert in their journal of this tour “over fields and shores” were published after his death under that title, Par les champs et par les grèves. This book contains some of his best writing—e.g., his description of a visit to Chateaubriand’s family estate, Combourg....
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par value (economics)
In a foreign exchange market, there may be a standard, government-determined price, or par value. This par value may be quoted in terms of another currency; for example, the par value of the pound was £1 = $2.80 between 1949 and 1967. In 1973 many governments abandoned their par values and let their exchange rates be determined by the forces of demand and supply. An exchange rate......
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par-three golf
Par-three golf courses, on which each hole measures 100 yards (90 metres) more or less and plays at par three, were developed as a result of the shortage of available open land in congested urban areas. Whereas a regulation 18-hole course may stretch to more than 7,000 yards, about 4 miles (6.4 km), an 18-hole par-three, or short-hole, course can be laid out in about 1,800 yards (1.6 km)....
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Pará (state, Brazil)
estado (state) of northern Brazil through which the lower Amazon River flows to the sea. It is bounded to the north by Guyana, Suriname, and the Brazilian state of Amapá, to the northeast by the Atlantic Ocean, to the east by the Brazilian states of Maranhão and Tocan...
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pāra (section of Qurʾān)
In pious circles the Qurʾān is often divided into 30 equal sections known as juzʾ (Persian and Urdu sipāra, or pāra). These break up the surahs arbitrarily, without regard to content, into 30 parts in order to facilitate the systematic reading of the entire Qurʾān in 30 days, or one lunar month. ...
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Pará (Brazil)
city and port, capital of Pará estado (state), northern Brazil, on the Baía do Guajará (Guajará Bay), part of the vast Amazon River delta, near the mouth of the Rio Guamá, about 80 miles (130 km) up the Rio Pará from the Atla...
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para adumma (Judaism)
in Jewish history, unblemished, never-before-yoked animal that was slaughtered and burned to restore ritual purity to those who had become unclean through contact with the dead (Numbers 19). Certain spoils of war and captives were also purified in this way. After the blood of the red heifer had been sprinkled by a priest, the carcass was totally immolated with cedarwood, hyssop, and a scarlet thre...
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Para el cielo y los altares (work by Benavente y Martínez)
In 1928 his play Para el cielo y los altares (“Toward Heaven and the Altars”), prophesying the fall of the Spanish monarchy, was prohibited by the government. During the Spanish Civil War Benavente lived in Barcelona and Valencia and was for a time under arrest. In 1941 he reestablished himself in public favour with Lo....
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“Para leer al Pato Donald” (work by Dorfman and Mattelart)
...destroyed as soon as Augusto Pinochet wrested power in 1973. While La firme was taking root, another publication appeared, Para leer al Pato Donald (1971; How to Read Donald Duck) by Ariel Dorfman and Armand Mattelart. This was a negative examination of the ubiquitous Disney comic (in the English-language edition of 1975, the subtitle......
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Pará nut (nut)
edible seed of a large South American tree (Bertholletia excelsa) found in the Amazonian forests of Brazil, Peru, Colombia, and Ecuador. The Brazil nut is particularly well known in the Brazilian state of Pará, where it is called castanha-do-pará (Pará nut) and is grown as one of the major ...
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Para nut (nut)
edible seed of a large South American tree (Bertholletia excelsa) found in the Amazonian forests of Brazil, Peru, Colombia, and Ecuador. The Brazil nut is particularly well known in the Brazilian state of Pará, where it is called castanha-do-pará (Pará nut) and is grown as one of the major ...
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Para nut tree (plant)
...species, which capture most of the sunlight and conduct most of the photosynthesis, are rubber trees (Hevea brasiliensis), silk-cotton trees (Ceiba pentandra), Brazil nut trees (Bertholletia excelsa), sapucaia trees (Lecythis), and sucupira trees (Bowdichia). Below the canopy are two or three levels of shade-tolerant trees, including certain species of......
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Pará River (river, Brazil)
channel of the Amazon delta and estuary of the Tocantins River. It passes to the south and east of Marajó Island, in northeastern Pará estado (state), northern Brazil. It carries a small part of the discharge of the Am...
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Para rubber tree (plant)
South American tropical tree (Hevea brasiliensis) of the spurge family. Cultivated on plantations in the tropics and subtropics, especially in Southeast Asia and ...
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para-aminobenzenesulfonamide (drug)
...azo dyes, which contained sulfonamide groups, were effective in treating streptococcal infections in mice. One of the dyes, known as Prontosil, was later found to be metabolized in the patient to sulfanilamide, which was the active antibacterial molecule. In 1933 Prontosil was given to the first patient, an infant with a systemic staphylococcal infection. The infant underwent a dramatic cure......
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para-aminobenzoic acid (chemical compound)
a vitamin-like substance and a growth factor required by several types of microorganisms. In bacteria, PABA is used in the synthesis of the vitamin folic acid. The drug sulfanilamide is effective in treating some bacterial diseases because it prevents ...
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para-aminohippuric acid (chemical compound)
The concept of clearance is also useful in the measurement of renal blood flow. Para-aminohippuric acid (PAH), when introduced into the bloodstream and kept at relatively low plasma concentrations, is rapidly excreted into the urine by both glomerular filtration and tubular secretion. Sampling of blood from the renal vein reveals that 90......
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para-aminosalicylic acid (chemical compound)
...the tubercle bacillus tends to become resistant to it. Fortunately, other drugs became available to supplement it, the two most important being para-aminosalicylic acid (PAS) and isoniazid. With a combination of two or more of these preparations, the outlook in tuberculosis improved immeasurably. The disease was not conquered, but it was......
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para-carborane (chemical compound)
...their systematic International Union of Pure and Applied Chemistry (IUPAC) name is closo-dicarbadodecaborane(12), the three isomers are often simply called ortho-, meta-, and para-carborane....
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para-cresol (chemical compound)
...molecular formula but having different structures: ortho- (o-) cresol, meta- (m-) cresol, and para- (p-) cresol....
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para-hydrogen (chemistry)
Two types of molecular hydrogen (ortho and para) are known. These differ in the magnetic interactions of the protons due to the spinning motions of the protons. In ortho-hydrogen, the spins of both protons are aligned in the same direction—that is, they are parallel. In para-hydrogen, the spins are aligned in opposite directions and are therefore antiparallel.......
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Para-Nilotic languages
...mixture (as an alternative to a uniform genetic classification into distinct language families) was defended most vigorously by the Africanist Carl Meinhof, who referred to these languages as “Nilo-Hamitic.” But, as Greenberg pointed out in his classificatory work, the mere presence of gender points only toward typological similarities between languages. What is at the heart of a....
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para-xylene (isomer)
...an important intermediate that leads principally to various coatings and plastics. The least valued of the isomers is meta-xylene, but it has uses in the manufacture of coatings and plastics. Para-xylene leads to polyesters, which reach the ultimate consumer as polyester fibres under various trademarked names....
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parabasis (literature)
an important choral ode in Greek Old Comedy delivered by the chorus at an intermission in the action while facing and moving toward the audience. It was used to express the author’s views on political or religious topics of the day. ...
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Parabel (river, Russia)
...right-bank tributary, the Chulym, shortly below the confluence of the Shegarka River from the left. Successive tributaries along the northwesterly course, after the Chulym, include the Chaya and the Parabel (both left), the Ket (right), the Vasyugan (left), and the Tym and Vakh rivers (both right). Down to the Vasyugan confluence the river passes through the southern belt of the taiga,......
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Parabellum pistol (weapon)
semiautomatic German hand weapon first manufactured in 1900 for both military and commercial use. It was made in 7.65- and 9-millimetre calibres and had a toggle-joint breech mechanism. On recoil after firing, the mechanism opened to receive a new cartridge from an eight-round, removable box magazine in its grip....
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Parablastoidea (class of echinoderms)
...about 460,000,000 years ago; with stem, theca, and arms with barblike structures (pinnules); plates of theca with pore system of unique type.†Class ParablastoideaLower to Middle Ordovician about 460,000,000–500,000,000 years ago; resemble Blastoidea but differ in structure of ambulacra and in numbers of thec...
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parable (literary genre)
any form of imaginative literature or spoken utterance constructed in such a way that readers or listeners are encouraged to look for meanings hidden beneath the literal surface of the fiction. A story is told or perhaps enacted whose details—when interpreted—are found to correspond to the details of some other system of relations (its hidden, allegorical sense). The poet, for......
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parable (biblical literature)
second, later, and smaller of the two major divisions of the Christian Bible, and the portion that is canonical (authoritative) only to Christianity....
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Parable of the Blind, The (painting by Bruegel)
...(1563). Toward the end of his life, Bruegel seems to have become fascinated by the problem of the falling figure. His studies reached their apogee in a rendering of successive stages of falling in “The Parable of the Blind.” The perfect unity of form, content, and expression marks this painting as a high point in European art....
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parabola (mathematics)
open curve, a conic section produced by the intersection of a right circular cone and a plane parallel to an element of the cone. As a plane curve, it may be defined as the path (locus) of a point moving so that its distance from a fixed line (the directrix) is equal to its distance from a fixed point (the focus)....
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Parábola del náufrago (work by Delibes)
...evinced in his Cinco horas con Mario (1966; “Five Hours with Mario”), a powerful novel wherein domestic conflict represents contending ideologies in the Civil War, and Parábola del náufrago (1969; “Parable of the Shipwrecked Man”), which examines the individual’s plight in a dehumanized technocracy. A publisher, lawyer, ...
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parabolic antenna (electronics)
A widely used form of radar antenna is the parabolic reflector, the principle of which is shown in cross section in part A of the figure. A horn antenna or other small antenna is placed at the focus of the parabola to illuminate the parabolic surface of the reflector. After being......
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parabolic equation
any of a class of partial differential equations arising in the mathematical analysis of diffusion phenomena, as in the heating of a slab. The simplest such equation in one dimension, uxx = ut, governs the temperature distribution at the various points al...
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parabolic microphone (instrument)
...of purposes or effects. For example, a parabolic reflector will focus a parallel wave of sound onto a specific point, allowing a very weak sound to be more easily heard. Such reflectors are used in parabolic microphones to collect sound from a distant source or to choose a location from which sound is to be observed and then focus it onto a microphone. An elliptical shape, on the other hand,......
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parabolic orbit
Newton’s friend, the astronomer Edmond Halley, endeavoured to compute the orbits of 24 comets for which he had found accurate enough historical documents. Applying Newton’s method, he presupposed a parabola as an approximation for each orbit. Among the 24 parabolas, 3 were identical in size and superimposed in space. The three relevant cometary passages (1531, 1607, and 1682) were se...
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parabolic partial differential equation
any of a class of partial differential equations arising in the mathematical analysis of diffusion phenomena, as in the heating of a slab. The simplest such equation in one dimension, uxx = ut, governs the temperature distribution at the various points al...
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parabolic reflector (electronics)
A widely used form of radar antenna is the parabolic reflector, the principle of which is shown in cross section in part A of the figure. A horn antenna or other small antenna is placed at the focus of the parabola to illuminate the parabolic surface of the reflector. After being......
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parabolic ski (sports equipment)
...for strength, and finally adding a plastic base. As early as the 19th century, Norwegians and others had designed skis with sides that curved up to form parabolic profiles when seen from an end. Parabolic skis began to be widely used in the 1990s and are now standard for all Alpine skis. The unique shape of parabolic skis allows novices and intermediate skiers to master difficult turns more......
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paraboloid
an open surface generated by rotating a parabola about its axis. If the axis of the surface is the z axis and the vertex is at the origin, the intersections of the surface with planes parallel to the xz and yz planes are parabolas (see , top). The intersections of the surface with planes parallel to and above the xy plane are circles. The gene...
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Parabuteo unicinctus
Some other buteos are the following: Harris’s, or the bay-winged, hawk (Parabuteo unicinctus), a large black bird with inconspicuous brown shoulders and flashing white rump, is found in South America and northward into the southwestern United States. The broad-winged hawk (B. platypterus), a crow-sized hawk, gray-brown with a black-and-white-banded tail, is fou...
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paracanthopterygian (fish)
any member of a large group of predatory, primarily marine fishes that forms one of about six major branches of the Teleostei, or bony fishes. Approximately 1,340 living species of paracanthopterygian fishes have been described. They range in length from just a few centimetres to roughly 2 metres (about 7 feet). Well-known forms include the ...
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Paracanthopterygii (fish)
any member of a large group of predatory, primarily marine fishes that forms one of about six major branches of the Teleostei, or bony fishes. Approximately 1,340 living species of paracanthopterygian fishes have been described. They range in length from just a few centimetres to roughly 2 metres (about 7 feet). Well-known forms include the ...
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Paracas (ancient South American culture)
culture centred on the peninsula of the same name, located in present-day southern Peru in the vicinity of Ica, during the Early Horizon and the Early Intermediate periods (c. 900 bc–ad 400). The Paracas culture’s earlier phase, called Paracas Cavernas, is related to the Chavín culture (c. 1000–400 b...
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Paracatu (river, Brazil)
...Minas Gerais and Bahia, through the extensive Sobradinho Reservoir, to the twin cities of Juàzeiro and Petrolina. In this stretch the river receives its main left-bank tributaries—the Paracatu, Urucuia, Corrente, and Grande rivers—and its main right-bank tributaries—the Verde Grande, Paramirim, and......
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Paracel Islands (islands, South China Sea)
group of about 130 small coral islands and reefs in the South China Sea. They lie about 250 miles (400 km) east of central Vietnam and about 220 miles (350 km) southeast of Hainan Island...
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