-
121 Angola
(and Enclave of Cabinda)From 1575 to 1975, Angola was a colony of Portugal. Located in west-central Africa, this colony has been one of the largest, most strategically located, and richest in mineral and agricultural resources in the continent. At first, Portugal's colonial impact was largely coastal, but after 1700 it became more active in the interior. By international treaties signed between 1885 and 1906, Angola's frontiers with what are now Zaire and Zambia were established. The colony's area was 1,246,700 square kilometers (481,000 square miles), Portugal's largest colonial territory after the independence of Brazil. In Portugal's third empire, Angola was the colony with the greatest potential.The Atlantic slave trade had a massive impact on the history, society, economy, and demography of Angola. For centuries, Angola's population played a subordinate role in the economy of Portugal's Brazil-centered empire. Angola's population losses to the slave trade were among the highest in Africa, and its economy became, to a large extent, hostage to the Brazilian plantation-based economic system. Even after Brazil's independence in 1822, Brazilian economic interests and capitalists were influential in Angola; it was only after Brazil banned the slave trade in 1850 that the heavy slave traffic to former Portuguese America began to wind down. Although slavery in Angola was abolished, in theory, in the 1870s, it continued in various forms, and it was not until the early 1960s that its offspring, forced labor, was finally ended.Portugal's economic exploitation of Angola went through different stages. During the era of the Atlantic slave trade (ca. 1575-1850), when many of Angola's slaves were shipped to Brazil, Angola's economy was subordinated to Brazil's and to Portugal's. Ambitious Lisbon-inspired projects followed when Portugal attempted to replace the illegal slave trade, long the principal income source for the government of Angola, with legitimate trade, mining, and agriculture. The main exports were dyes, copper, rubber, coffee, cotton, and sisal. In the 1940s and 1950s, petroleum emerged as an export with real potential. Due to the demand of the World War II belligerents for Angola's raw materials, the economy experienced an impetus, and soon other articles such as diamonds, iron ore, and manganese found new customers. Angola's economy, on an unprecedented scale, showed significant development, which was encouraged by Lisbon. Portugal's colonization schemes, sending white settlers to farm in Angola, began in earnest after 1945, although such plans had been nearly a century in the making. Angola's white population grew from about 40,000 in 1940 to nearly 330,000 settlers in 1974, when the military coup occurred in Portugal.In the early months of 1961, a war of African insurgency broke out in northern Angola. Portugal dispatched armed forces to suppress resistance, and the African insurgents were confined to areas on the borders of northern and eastern Angola at least until the 1966-67 period. The 13-year colonial war had a telling impact on both Angola and Portugal. When the Armed Forces Movement overthrew the Estado Novo on 25 April 1974, the war in Angola had reached a stalemate and the major African nationalist parties (MPLA, FNLA, and UNITA) had made only modest inroads in the northern fringes and in central and eastern Angola, while there was no armed activity in the main cities and towns.After a truce was called between Portugal and the three African parties, negotiations began to organize the decolonizat ion process. Despite difficult maneuvering among the parties, Portugal, the MPLA, FNLA, and UNITA signed the Alvor Agreement of January 1975, whereby Portugal would oversee a transition government, create an all-Angola army, and supervise national elections to be held in November 1975. With the outbreak of a bloody civil war among the three African parties and their armies, the Alvor Agreement could not be put into effect. Fighting raged between March and November 1975. Unable to prevent the civil war or to insist that free elections be held, Portugal's officials and armed forces withdrew on 11 November 1975. Rather than handing over power to one party, they transmitted sovereignty to the people of Angola. Angola's civil war continued into the 21st century. -
122 Catholic church
The Catholic Church and the Catholic religion together represent the oldest and most enduring of all Portuguese institutions. Because its origins as an institution go back at least to the middle of the third century, if not earlier, the Christian and later the Catholic Church is much older than any other Portuguese institution or major cultural influence, including the monarchy (lasting 770 years) or Islam (540 years). Indeed, it is older than Portugal (869 years) itself. The Church, despite its changing doctrine and form, dates to the period when Roman Lusitania was Christianized.In its earlier period, the Church played an important role in the creation of an independent Portuguese monarchy, as well as in the colonization and settlement of various regions of the shifting Christian-Muslim frontier as it moved south. Until the rise of absolutist monarchy and central government, the Church dominated all public and private life and provided the only education available, along with the only hospitals and charity institutions. During the Middle Ages and the early stage of the overseas empire, the Church accumulated a great deal of wealth. One historian suggests that, by 1700, one-third of the land in Portugal was owned by the Church. Besides land, Catholic institutions possessed a large number of chapels, churches and cathedrals, capital, and other property.Extensive periods of Portuguese history witnessed either conflict or cooperation between the Church as the monarchy increasingly sought to gain direct control of the realm. The monarchy challenged the great power and wealth of the Church, especially after the acquisition of the first overseas empire (1415-1580). When King João III requested the pope to allow Portugal to establish the Inquisition (Holy Office) in the country and the request was finally granted in 1531, royal power, more than religion was the chief concern. The Inquisition acted as a judicial arm of the Catholic Church in order to root out heresies, primarily Judaism and Islam, and later Protestantism. But the Inquisition became an instrument used by the crown to strengthen its power and jurisdiction.The Church's power and prestige in governance came under direct attack for the first time under the Marquis of Pombal (1750-77) when, as the king's prime minister, he placed regalism above the Church's interests. In 1759, the Jesuits were expelled from Portugal, although they were allowed to return after Pombal left office. Pombal also harnessed the Inquisition and put in place other anticlerical measures. With the rise of liberalism and the efforts to secularize Portugal after 1820, considerable Church-state conflict occurred. The new liberal state weakened the power and position of the Church in various ways: in 1834, all religious orders were suppressed and their property confiscated both in Portugal and in the empire and, in the 1830s and 1840s, agrarian reform programs confiscated and sold large portions of Church lands. By the 1850s, Church-state relations had improved, various religious orders were allowed to return, and the Church's influence was largely restored. By the late 19th century, Church and state were closely allied again. Church roles in all levels of education were pervasive, and there was a popular Catholic revival under way.With the rise of republicanism and the early years of the First Republic, especially from 1910 to 1917, Church-state relations reached a new low. A major tenet of republicanism was anticlericalism and the belief that the Church was as much to blame as the monarchy for the backwardness of Portuguese society. The provisional republican government's 1911 Law of Separation decreed the secularization of public life on a scale unknown in Portugal. Among the new measures that Catholics and the Church opposed were legalization of divorce, appropriation of all Church property by the state, abolition of religious oaths for various posts, suppression of the theology school at Coimbra University, abolition of saints' days as public holidays, abolition of nunneries and expulsion of the Jesuits, closing of seminaries, secularization of all public education, and banning of religious courses in schools.After considerable civil strife over the religious question under the republic, President Sidónio Pais restored normal relations with the Holy See and made concessions to the Portuguese Church. Encouraged by the apparitions at Fátima between May and October 1917, which caused a great sensation among the rural people, a strong Catholic reaction to anticlericalism ensued. Backed by various new Catholic organizations such as the "Catholic Youth" and the Academic Center of Christian Democracy (CADC), the Catholic revival influenced government and politics under the Estado Novo. Prime Minister Antônio de Oliveira Salazar was not only a devout Catholic and member of the CADC, but his formative years included nine years in the Viseu Catholic Seminary preparing to be a priest. Under the Estado Novo, Church-state relations greatly improved, and Catholic interests were protected. On the other hand, Salazar's no-risk statism never went so far as to restore to the Church all that had been lost in the 1911 Law of Separation. Most Church property was never returned from state ownership and, while the Church played an important role in public education to 1974, it never recovered the influence in education it had enjoyed before 1911.Today, the majority of Portuguese proclaim themselves Catholic, and the enduring nature of the Church as an institution seems apparent everywhere in the country. But there is no longer a monolithic Catholic faith; there is growing diversity of religious choice in the population, which includes an increasing number of Protestant Portuguese as well as a small but growing number of Muslims from the former Portuguese empire. The Muslim community of greater Lisbon erected a Mosque which, ironically, is located near the Spanish Embassy. In the 1990s, Portugal's Catholic Church as an institution appeared to be experiencing a revival of influence. While Church attendance remained low, several Church institutions retained an importance in society that went beyond the walls of the thousands of churches: a popular, flourishing Catholic University; Radio Re-nascenca, the country's most listened to radio station; and a new private television channel owned by the Church. At an international conference in Lisbon in September 2000, the Cardinal Patriarch of Portugal, Dom José Policarpo, formally apologized to the Jewish community of Portugal for the actions of the Inquisition. At the deliberately selected location, the place where that religious institution once held its hearings and trials, Dom Policarpo read a declaration of Catholic guilt and repentance and symbolically embraced three rabbis, apologizing for acts of violence, pressures to convert, suspicions, and denunciation. -
123 единица веса
unit weight, unit of weight
- времени — unit time, unit of time
скорость выражается в любых единицах расстояния (пути), деленных на единицу времени, — speed is expressed in any unit of distance divided by any unit of time (or unit time).
- длины — unit length
- измерения — unit (of measure)
- измерения информации (бит) — bit
- массы — unit mass
-, международная — international unit
- мощности — unit power
- объема — unit volume
- перегрузки — unit of acceleration
- перегрузки (абсолютная) — load factor (n).
accelerometer scale range is -2 to +6 n..
- площади — unit area
- пути (дальности) — unit of distance
- работы — unit work
-, сборочная — assembly
-, тепловая — thermal unit
в e. времени — in unit time
за e. времени — per unit time
на e. веса (объема площади) — per unit weight (volume, area)
нагрузка на е. площади — load per unit area
система e. — system of units
система e. сгс — cgs
(сантиметр, грамм, секунда) — (centimeter-gram-second) system of units
удельная мощность (в л.с.) на e. веса — horse power per unit weight
усилие на штурвале на е. перегрузки — control column force per unit of normal acceleration
выражать в е.... — express in units of...Русско-английский сборник авиационно-технических терминов > единица веса
-
124 Bergius, Friedrich Carl Rudolf
[br]b. 11 October 1884 Goldschmieden, near Breslau, Germanyd. 31 March Buenos Aires, Argentina[br][br]After studying chemistry in Breslau and Leipzig and assisting inter alia at the institute of Fritz Haber in Karlsruhe on the catalysis of ammonia under high pressure, in 1909 he went to Hannover to pursue his idea of turning coal into liquid hydrocarbon under high hydrogen pressure (200 atm) and high temperatures (470° C). As experiments with high pressure in chemical processes were still in their initial stages and the Technical University could not support him sufficiently, he set up a private laboratory to develop the methods and to construct the equipment himself. Four years later, in 1913, his process for producing liquid or organic compounds from coal was patented.The economic aspects of this process were apparent as the demand for fuels and lubricants increased more rapidly than the production of oil, and Bergius's process became even more important after the outbreak of the First World War. The Th. Goldschmidt company of Essen contracted him and tried large-scale production near Mannheim in 1914, but production failed because of the lack of capital and experience to operate with high pressure on an industrial level. Both capital and experience were provided jointly by the BASF company, which produced ammonia at Merseburg, and IG Farben, which took over the Bergius process in 1925, the same year that the synthesis of hydrocarbon had been developed by Fischer-Tropsch. Two years later, at the Leuna works, almost 100,000 tonnes of oil were produced from coal; during the following years, several more hydrogenation plants were to follow, especially in the eastern parts of Germany as well as in the Ruhr area, while the government guaranteed the costs. The Bergius process was extremely important for the supply of fuels to Germany during the Second World War, with the monthly production rate in 1943–4 being more than 700,000 tonnes. However, the plants were mostly destroyed at. the end of the war and were later dismantled.As a consequence of this success Bergius, who had gained an international reputation, went abroad to work as a consultant to several foreign governments. Experiments aiming to reduce the costs of production are still continued in some countries. By 1925, after he had solved all the principles of his process, he had turned to the production of dextrose by hydrolyzing wood with highly concentrated hydrochloric acid.[br]Principal Honours and DistinctionsNobel Prize 1931. Honorary doctorates, Heidelberg, Harvard and Hannover.Bibliography1907, "Über absolute Schwefelsäure als Lösungsmittel", unpublished thesis, Weida. 1913, Die Anwendung hoher Drucke bei chemischen Vorgängen und eine Nachbildungdes Entstehungsprozesses der Steinkohle, Halle. 1913, DRP no. 301, 231 (coal-liquefaction process).1925, "Verflüssigung der Kohle", Zeitschrift des Vereins Deutscher Ingenieure, 69:1313–20, 1359–62.1933, "Chemische Reaktionen unter hohem Druck", Les Prix Nobel en 1931, Stockholm, pp. 1–37.Further ReadingDeutsches Bergbau-Museum, 1985, Friedrich Bergius und die Kohleverflüssigung. Stationen einer Entwicklung, Bochum (gives a comprehensive and illustrated description of the man and the technology).H.Beck, 1982, Friedrich Bergius, ein Erfinderschicksal, Munich: Deutsches Museum (a detailed biographical description).W.Birkendfeld, 1964, Der synthetische Treibstoff 1933–1945. Ein Beitragzur nationalsozialistischen Wirtschafts-und Rüstungspolitik, Göttingen, Berlin and Frankfurt (describes the economic value of synthetic fuels for the Third Reich).WKBiographical history of technology > Bergius, Friedrich Carl Rudolf
-
125 Bollée, Ernest-Sylvain
[br]b. 19 July 1814 Clefmont (Haute-Marne), Franced. 11 September 1891 Le Mans, France[br]French inventor of the rotor-stator wind engine and founder of the Bollée manufacturing industry.[br]Ernest-Sylvain Bollée was the founder of an extensive dynasty of bellfounders based in Le Mans and in Orléans. He and his three sons, Amédée (1844–1917), Ernest-Sylvain fils (1846–1917) and Auguste (1847-?), were involved in work and patents on steam-and petrol-driven cars, on wind engines and on hydraulic rams. The presence of the Bollées' car industry in Le Mans was a factor in the establishment of the car races that are held there.In 1868 Ernest-Sylvain Bollée père took out a patent for a wind engine, which at that time was well established in America and in England. In both these countries, variable-shuttered as well as fixed-blade wind engines were in production and patented, but the Ernest-Sylvain Bollée patent was for a type of wind engine that had not been seen before and is more akin to the water-driven turbine of the Jonval type, with its basic principle being parallel to the "rotor" and "stator". The wind drives through a fixed ring of blades on to a rotating ring that has a slightly greater number of blades. The blades of the fixed ring are curved in the opposite direction to those on the rotating blades and thus the air is directed onto the latter, causing it to rotate at a considerable speed: this is the "rotor". For greater efficiency a cuff of sheet iron can be attached to the "stator", giving a tunnel effect and driving more air at the "rotor". The head of this wind engine is turned to the wind by means of a wind-driven vane mounted in front of the blades. The wind vane adjusts the wind angle to enable the wind engine to run at a constant speed.The fact that this wind engine was invented by the owner of a brass foundry, with all the gear trains between the wind vane and the head of the tower being of the highest-quality brass and, therefore, small in scale, lay behind its success. Also, it was of prefabricated construction, so that fixed lengths of cast-iron pillar were delivered, complete with twelve treads of cast-iron staircase fixed to the outside and wrought-iron stays. The drive from the wind engine was taken down the inside of the pillar to pumps at ground level.Whilst the wind engines were being built for wealthy owners or communes, the work of the foundry continued. The three sons joined the family firm as partners and produced several steam-driven vehicles. These vehicles were the work of Amédée père and were l'Obéissante (1873); the Autobus (1880–3), of which some were built in Berlin under licence; the tram Bollée-Dalifol (1876); and the private car La Mancelle (1878). Another important line, in parallel with the pumping mechanism required for the wind engines, was the development of hydraulic rams, following the Montgolfier patent. In accordance with French practice, the firm was split three ways when Ernest-Sylvain Bollée père died. Amédée père inherited the car side of the business, but it is due to Amédée fils (1867– 1926) that the principal developments in car manufacture came into being. He developed the petrol-driven car after the impetus given by his grandfather, his father and his uncle Ernest-Sylvain fils. In 1887 he designed a four-stroke single-cylinder engine, although he also used engines designed by others such as Peugeot. He produced two luxurious saloon cars before putting Torpilleur on the road in 1898; this car competed in the Tour de France in 1899. Whilst designing other cars, Amédée's son Léon (1870–1913) developed the Voiturette, in 1896, and then began general manufacture of small cars on factory lines. The firm ceased work after a merger with the English firm of Morris in 1926. Auguste inherited the Eolienne or wind-engine side of the business; however, attracted to the artistic life, he sold out to Ernest Lebert in 1898 and settled in the Paris of the Impressionists. Lebert developed the wind-engine business and retained the basic "stator-rotor" form with a conventional lattice tower. He remained in Le Mans, carrying on the business of the manufacture of wind engines, pumps and hydraulic machinery, describing himself as a "Civil Engineer".The hydraulic-ram business fell to Ernest-Sylvain fils and continued to thrive from a solid base of design and production. The foundry in Le Mans is still there but, more importantly, the bell foundry of Dominique Bollée in Saint-Jean-de-Braye in Orléans is still at work casting bells in the old way.[br]Further ReadingAndré Gaucheron and J.Kenneth Major, 1985, The Eolienne Bollée, The International Molinological Society.Cénomane (Le Mans), 11, 12 and 13 (1983 and 1984).KM -
126 Haber, Fritz
SUBJECT AREA: Chemical technology[br]b. 9 December 1868 Breslau, Germany (now Wroclaw, Poland)d. 29 January 1934 Basel, Switzerland[br]German chemist, inventor of the process for the synthesis of ammonia.[br]Haber's father was a manufacturer of dyestuffs, so he studied organic chemistry at Berlin and Heidelberg universities to equip him to enter his father's firm. But his interest turned to physical chemistry and remained there throughout his life. He became Assistant at the Technische Hochschule in Karlsruhe in 1894; his first work there was on pyrolysis and electrochemistry, and he published his Grundrisse der technischen Electrochemie in 1898. Haber became famous for thorough and illuminating theoretical studies in areas of growing practical importance. He rose through the academic ranks and was appointed a full professor in 1906. In 1912 he was also appointed Director of the Institute of Physical Chemistry and Electrochemistry at Dahlem, outside Berlin.Early in the twentieth century Haber invented a process for the synthesis of ammonia. The English chemist and physicist Sir William Crookes (1832–1919) had warned of the danger of mass hunger because the deposits of Chilean nitrate were becoming exhausted and nitrogenous fertilizers would not suffice for the world's growing population. A solution lay in the use of the nitrogen in the air, and the efforts of chemists centred on ways of converting it to usable nitrate. Haber was aware of contemporary work on the fixation of nitrogen by the cyanamide and arc processes, but in 1904 he turned to the study of ammonia formation from its elements, nitrogen and hydrogen. During 1907–9 Haber found that the yield of ammonia reached an industrially viable level if the reaction took place under a pressure of 150–200 atmospheres and a temperature of 600°C (1,112° F) in the presence of a suitable catalyst—first osmium, later uranium. He devised an apparatus in which a mixture of the gases was pumped through a converter, in which the ammonia formed was withdrawn while the unchanged gases were recirculated. By 1913, Haber's collaborator, Carl Bosch had succeeded in raising this laboratory process to the industrial scale. It was the first successful high-pressure industrial chemical process, and solved the nitrogen problem. The outbreak of the First World War directed the work of the institute in Dahlem to military purposes, and Haber was placed in charge of chemical warfare. In this capacity, he developed poisonous gases as well as the means of defence against them, such as gas masks. The synthetic-ammonia process was diverted to produce nitric acid for explosives. The great benefits and achievement of the Haber-Bosch process were recognized by the award in 1919 of the Nobel Prize in Chemistry, but on account of Haber's association with chemical warfare, British, French and American scientists denounced the award; this only added to the sense of bitterness he already felt at his country's defeat in the war. He concentrated on the theoretical studies for which he was renowned, in particular on pyrolysis and autoxidation, and both the Karlsruhe and the Dahlem laboratories became international centres for discussion and research in physical chemistry.With the Nazi takeover in 1933, Haber found that, as a Jew, he was relegated to second-class status. He did not see why he should appoint staff on account of their grandmothers instead of their ability, so he resigned his posts and went into exile. For some months he accepted hospitality in Cambridge, but he was on his way to a new post in what is now Israel when he died suddenly in Basel, Switzerland.[br]Bibliography1898, Grundrisse der technischen Electrochemie.1927, Aus Leben und Beruf.Further ReadingJ.E.Coates, 1939, "The Haber Memorial Lecture", Journal of the Chemical Society: 1,642–72.M.Goran, 1967, The Story of Fritz Haber, Norman, OK: University of Oklahoma Press (includes a complete list of Haber's works).LRD -
127 Paxton, Sir Joseph
[br]b. 3 August 1801 Milton Bryant, Bedfordshire, Englandd. 8 June 1865 Sydenham, London, England[br]English designer of the Crystal Palace, the first large-scale prefabricated ferrovitreous structure.[br]The son of a farmer, he had worked in gardens since boyhood and at the age of 21 was employed as Undergardener at the Horticultural Society Gardens in Chiswick, from where he went on to become Head Gardener for the Duke of Devonshire at Chatsworth. It was there that he developed his methods of glasshouse construction, culminating in the Great Conservatory of 1836–40, an immense structure some 277 ft (84.4 m) long, 123 ft (37.5 m) wide and 67 ft (20.4 m) high. Its framework was of iron and its roof of glass, with wood to contain the glass panels; it is now demolished. Paxton went on to landscape garden design, fountain and waterway engineering, the laying out of the model village of Edensor, and to play a part in railway and country house projects.The structure that made Paxton a household name was erected in Hyde Park, London, to house the Great Exhibition of 1851 and was aptly dubbed, by Punch, the Crystal Palace. The idea of holding an international exhibition for industry had been mooted in 1849 and was backed by Prince Albert and Henry Cole. The money for this was to be raised by public subscription and 245 designs were entered into a competition held in 1850; however, most of the concepts, received from many notable architects and engineers, were very costly and unsuitable, and none were accepted. That same year, Paxton published his scheme in the Illustrated London News and it was approved after it received over-whelming public support.Paxton's Crystal Palace, designed and erected in association with the engineers Fox and Henderson, was a prefabricated glasshouse of vast dimensions: it was 1,848 ft (563.3 m) long, 408 ft (124.4 m) wide and over 100 ft (30.5 m) high. It contained 3,300 iron columns, 2,150 girders. 24 miles (39 km) of guttering, 600,000 ft3 (17,000 m3) of timber and 900,000 ft2 (84,000 m) of sheet glass made by Chance Bros, of Birmingham. One of the chief reasons why it was accepted by the Royal Commission Committee was that it fulfilled the competition proviso that it should be capable of being erected quickly and subsequently dismantled and re-erected elsewhere. The Crystal Palace was to be erected at a cost of £79,800, much less than the other designs. Building began on 30 July 1850, with a labour force of some 2,000, and was completed on 31 March 1851. It was a landmark in construction at the time, for its size, speed of construction and its non-eclectic design, and, most of all, as the first great prefabricated building: parts were standardized and made in quantity, and were assembled on site. The exhibition was opened by Queen Victoria on 1 May 1851 and had received six million visitors when it closed on 11 October. The building was dismantled in 1852 and reassembled, with variations in design, at Sydenham in south London, where it remained until its spectacular conflagration in 1936.[br]Principal Honours and DistinctionsKnighted 1851. MP for Coventry 1854–65. Fellow Linnaean Society 1853; Horticultural Society 1826. Order of St Vladimir, Russia, 1844.Further ReadingP.Beaver, 1986, The Crystal Palace: A Portrait of Victorian Enterprise, Phillimore. George F.Chadwick, 1961, Works of Sir Joseph Paxton 1803–1865, Architectural Press.DY -
128 Tesla, Nikola
SUBJECT AREA: Electricity[br]b. 9 July 1856 Smiljan, Croatiad. 7 January 1943 New York, USA[br]Serbian (naturalized American) engineer and inventor of polyphase electrical power systems.[br]While at the technical institute in Graz, Austria, Tesla's attention was drawn to the desirability of constructing a motor without a commutator. He considered the sparking between the commutator and brushes of the Gramme machine when run as a motor a serious defect. In 1881 he went to Budapest to work on the telegraph system and while there conceived the principle of the rotating magnetic field, upon which all polyphase induction motors are based. In 1882 Tesla moved to Paris and joined the Continental Edison Company. After building a prototype of his motor he emigrated to the United States in 1884, becoming an American citizen in 1889. He left Edison and founded an independent concern, the Tesla Electric Company, to develop his inventions.The importance of Tesla's first patents, granted in 1888 for alternating-current machines, cannot be over-emphasized. They covered a complete polyphase system including an alternator and induction motor. Other patents included the polyphase transformer, synchronous motor and the star connection of three-phase machines. These were to become the basis of the whole of the modern electric power industry. The Westinghouse company purchased the patents and marketed Tesla motors, obtaining in 1893 the contract for the Niagara Falls two-phase alternators driven by 5,000 hp (3,700 kW) water turbines.After a short period with Westinghouse, Tesla resigned to continue his research into high-frequency and high-voltage phenomena using the Tesla coil, an air-cored transformer. He lectured in America and Europe on his high-frequency devices, enjoying a considerable international reputation. The name "tesla" has been given to the SI unit of magnetic-flux density. The induction motor became one of the greatest advances in the industrial application of electricity. A claim for priority of invention of the induction motor was made by protagonists of Galileo Ferraris (1847–1897), whose discovery of rotating magnetic fields produced by alternating currents was made independently of Tesla's. Ferraris demonstrated the phenomenon but neglected its exploitation to produce a practical motor. Tesla himself failed to reap more than a small return on his work and later became more interested in scientific achievement than commercial success, with his patents being infringed on a wide scale.[br]Principal Honours and DistinctionsAmerican Institute of Electrical Engineers Edison Medal 1917. Tesla received doctorates from fourteen universities.Bibliography1 May 1888, American patent no. 381,968 (initial patent for the three-phase induction motor).1956, Nikola Tesla, 1856–1943, Lectures, Patents, Articles, ed. L.I.Anderson, Belgrade (selected works, in English).1977, My Inventions, repub. Zagreb (autobiography).Further ReadingM.Cheney, 1981, Tesla: Man Out of Time, New Jersey (a full biography). C.Mackechnie Jarvis, 1969, in IEE Electronics and Power 15:436–40 (a brief treatment).T.C.Martin, 1894, The Inventions, Researches and Writings of Nikola Tesla, New York (covers his early work on polyphase systems).GW
Страницы
См. также в других словарях:
International Scale of River Difficulty — Class III rapid at Canolfan Tryweryn, Wales. The International Scale of River Difficulty is a standardized scale used to rate the safety of a stretch of river, or a single (sometimes whitewater) rapid. The grade reflects the technical difficulty… … Wikipedia
international scale — noun a temperature scale that defines the freezing point of water as 0 degrees and the boiling point of water as 100 degrees • Syn: ↑Celsius scale, ↑centigrade scale • Hypernyms: ↑temperature scale … Useful english dictionary
International Communist Current — The International Communist Current is an international centralised left communist organisation which was formed in 1975 and which has sections in France, Great Britain, Mexico, Belgium, Netherlands, Germany, Spain, Venezuela, Brazil, Sweden,… … Wikipedia
Scale — A bank that offers to pay different rates of interest on CDs of varying rates is said to post a scale. Commercial paper dealers also post scales. The New York Times Financial Glossary * * * scale scale [skeɪl] noun 1. [singular, uncountable] the… … Financial and business terms
scale — Payment of different rates of interest on CDs of varying maturities ( maturity). A bank is said to post a scale. Commercial paper dealers also post scales. Bloomberg Financial Dictionary * * * scale scale [skeɪl] noun 1. [singular, uncountable]… … Financial and business terms
International auxiliary language — An international auxiliary language (sometimes abbreviated as IAL or auxlang) or interlanguage is a language meant for communication between people from different nations who do not share a common native language. An auxiliary language is… … Wikipedia
International Journal of Private Law — Infobox Journal title = International Journal of Private Law (IJPL) editor = discipline = Law review, Commercial law, bankruptcy law, Employment and labour, International law, Intellectual property, E commerce, Torts, Contract law, Sports law,… … Wikipedia
International Cycling Video Festival — The International Cycling Video Festival, founded 2005, takes place every late summer in Bochum, Germany. It is managed by the local cycling club Team Hollandse Frietjes non professional cycling .The objecitve of the festival is to strengthen the … Wikipedia
International Atomic Time — ( [http://www.bipm.org/en/scientific/tai/tai.html TAI] , from the French name Temps Atomique International) is a high precision atomic time standard that tracks proper time on Earth s geoid. It is the principal realisation of Terrestrial Time,… … Wikipedia
Scale space — theory is a framework for multi scale signal representation developed by the computer vision, image processing and signal processing communities with complementary motivations from physics and biological vision. It is a formal theory for handling … Wikipedia
Scale space implementation — Scale space Scale space axioms Scale space implementation Feature detection Edge detection Blob detection Corner detection … Wikipedia
