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41 лава
ж. горн. wall, face, longwall -
42 Heaviside, Oliver
[br]b. 18 May 1850 London, Englandd. 2 February 1925 Torquay, Devon, England[br]English physicist who correctly predicted the existence of the ionosphere and its ability to reflect radio waves.[br]Brought up in poor, almost Dickensian, circumstances, at the age of 13 years Heaviside, a nephew by marriage of Sir Charles Wheatstone, went to Camden House Grammar School. There he won a medal for science, but he was forced to leave because his parents could not afford the fees. After a year of private study, he began his working life in Newcastle in 1870 as a telegraph operator for an Anglo-Dutch cable company, but he had to give up after only four years because of increasing deafness. He therefore proceeded to spend his time studying theoretical aspects of electrical transmission and communication, and moved to Devon with his parents in 1889. Because the operation of many electrical circuits involves transient phenomena, he found it necessary to develop what he called operational calculus (which was essentially a form of the Laplace transform calculus) in order to determine the response to sudden voltage and current changes. In 1893 he suggested that the distortion that occurred on long-distance telephone lines could be reduced by adding loading coils at regular intervals, thus creating a matched-transmission line. Between 1893 and 1912 he produced a series of writings on electromagnetic theory, in one of which, anticipating a conclusion of Einstein's special theory of relativity, he put forward the idea that the mass of an electric charge increases with its velocity. When it was found that despite the curvature of the earth it was possible to communicate over very great distances using radio signals in the so-called "short" wavebands, Heaviside suggested the presence of a conducting layer in the ionosphere that reflected the waves back to earth. Since a similar suggestion had been made almost at the same time by Arthur Kennelly of Harvard, this layer became known as the Kennelly-Heaviside layer.[br]Principal Honours and DistinctionsFRS 1891. Institution of Electrical Engineers Faraday Medal 1924. Honorary PhD Gottingen. Honorary Member of the American Association for the Advancement of Science.Bibliography1872. "A method for comparing electro-motive forces", English Mechanic (July).1873. Philosophical Magazine (February) (a paper on the use of the Wheatstone Bridge). 1889, Electromagnetic Waves.1892, Electrical Papers.1893–1912, Electromagnetic Theory.Further ReadingI.Catt (ed.), 1987, Oliver Heaviside, The Man, St Albans: CAM Publishing.P.J.Nahin, 1988, Oliver Heaviside, Sage in Solitude: The Life and Works of an Electrical Genius of the Victorian Age, Institute of Electrical and Electronics Engineers, New York.J.B.Hunt, The Maxwellians, Ithaca: Cornell University Press.See also: Appleton, Sir Edward VictorKF -
43 подача
подача сущ1. admission2. admittance автомат подачи пускового топливаstarting fuel control unitвключать подачу топлива из бака с помощью электрического кранаswitch to the proper tankвключать подачу топлива из бока с помощью механического кранаturn the proper tank onгалерея для подачи грузовloading finderдавление в системе подачи топливаfuel supply pressureдогорание после отсечки подачиtorchingканал подачиfeed pipeкислородный прибор регулируемой подачиdemand-type oxygen regulatorметод подачи сигналовsignaling methodнасос подачи маслаoil-feed pumpперекрывать подачу топливаshut off fuelподача самотекомgravity flowподача топлива в систему воздушного суднаaircraft fuel supplyпрекращать подачу сигналаcancel the signalраспределение подачи при помощи системы трубопроводовmanifoldingрегулирование подачиmeteringрегулирование подачи топливаfuel meteringрычаг стоп-крана подачи топливаfuel shutoff valve leverсистема подачиpriming system(топлива в двигатель) система подачи топлива1. fuel supply system2. fuel feed system система подачи топлива под давлениемpressure fuel systemсистема подачи топлива самотекомfuel gravity systemсистема снижения подачи топливаfuel dip systemсистема управления подачей топливаfuel management systemуплотнять опору подачей давленияpressurize the bearingфорсунка первого контура подачи топливаprimary fuel nozzleцепь подачи питанияpower supply circuit
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