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21 mechanics
n механикаmechanics of fluids — механика жидкостей и газов, гидромеханика
Синонимический ряд:science (noun) aerodynamics; applied mathematics; astrophysics; natural philosophy; nuclear physics; physics; science; science of matter and motion; thermodynamics -
22 thermodynamics
n термодинамикаСинонимический ряд:science (noun) aerodynamics; applied mathematics; astrophysics; mechanics; natural philosophy; nuclear physics; physics; science; science of matter and motion -
23 Cayley, Sir George
SUBJECT AREA: Aerospace[br]b. 27 December 1773 Scarborough, Englandd. 15 December 1857 Brompton Hall, Yorkshire, England[br]English pioneer who laid down the basic principles of the aeroplane in 1799 and built a manned glider in 1853.[br]Cayley was born into a well-to-do Yorkshire family living at Brompton Hall. He was encouraged to study mathematics, navigation and mechanics, particularly by his mother. In 1792 he succeeded to the baronetcy and took over the daunting task of revitalizing the run-down family estate.The first aeronautical device made by Cayley was a copy of the toy helicopter invented by the Frenchmen Launoy and Bienvenu in 1784. Cayley's version, made in 1796, convinced him that a machine could "rise in the air by mechanical means", as he later wrote. He studied the aerodynamics of flight and broke away from the unsuccessful ornithopters of his predecessors. In 1799 he scratched two sketches on a silver disc: one side of the disc showed the aerodynamic force on a wing resolved into lift and drag, and on the other side he illustrated his idea for a fixed-wing aeroplane; this disc is preserved in the Science Museum in London. In 1804 he tested a small wing on the end of a whirling arm to measure its lifting power. This led to the world's first model glider, which consisted of a simple kite (the wing) mounted on a pole with an adjustable cruciform tail. A full-size glider followed in 1809 and this flew successfully unmanned. By 1809 Cayley had also investigated the lifting properties of cambered wings and produced a low-drag aerofoil section. His aim was to produce a powered aeroplane, but no suitable engines were available. Steam-engines were too heavy, but he experimented with a gunpowder motor and invented the hot-air engine in 1807. He published details of some of his aeronautical researches in 1809–10 and in 1816 he wrote a paper on airships. Then for a period of some twenty-five years he was so busy with other activities that he largely neglected his aeronautical researches. It was not until 1843, at the age of 70, that he really had time to pursue his quest for flight. The Mechanics' Magazine of 8 April 1843 published drawings of "Sir George Cayley's Aerial Carriage", which consisted of a helicopter design with four circular lifting rotors—which could be adjusted to become wings—and two pusher propellers. In 1849 he built a full-size triplane glider which lifted a boy off the ground for a brief hop. Then in 1852 he proposed a monoplane glider which could be launched from a balloon. Late in 1853 Cayley built his "new flyer", another monoplane glider, which carried his coachman as a reluctant passenger across a dale at Brompton, Cayley became involved in public affairs and was MP for Scarborough in 1832. He also took a leading part in local scientific activities and was co-founder of the British Association for the Advancement of Science in 1831 and of the Regent Street Polytechnic Institution in 1838.[br]BibliographyCayley wrote a number of articles and papers, the most significant being "On aerial navigation", Nicholson's Journal of Natural Philosophy (November 1809—March 1810) (published in three numbers); and two further papers with the same title in Philosophical Magazine (1816 and 1817) (both describe semi-rigid airships).Further ReadingL.Pritchard, 1961, Sir George Cayley, London (the standard work on the life of Cayley).C.H.Gibbs-Smith, 1962, Sir George Cayley's Aeronautics 1796–1855, London (covers his aeronautical achievements in more detail).—1974, "Sir George Cayley, father of aerial navigation (1773–1857)", Aeronautical Journal (Royal Aeronautical Society) (April) (an updating paper).JDS -
24 Thomson, Sir William, Lord Kelvin
[br]b. 26 June 1824 Belfast, Ireland (now Northern Ireland)d. 17 December 1907 Largs, Scotland[br]Irish physicist and inventor who contributed to submarine telegraphy and instrumentation.[br]After education at Glasgow University and Peterhouse, Cambridge, a period of study in France gave Thomson an interest in experimental work and instrumentation. He became Professor of Natural Philosophy at Glasgow in 1846 and retained the position for the rest of his career, establishing the first teaching laboratory in Britain.Among his many contributions to science and engineering was his concept, introduced in 1848, of an "absolute" zero of temperature. Following on from the work of Joule, his investigations into the nature of heat led to the first successful liquefaction of gases such as hydrogen and helium, and later to the science of low-temperature physics.Cable telegraphy gave an impetus to the scientific measurement of electrical quantities, and for many years Thomson was a member of the British Association Committee formed in 1861 to consider electrical standards and to develop units; these are still in use. Thomson first became Scientific Adviser to the Atlantic Telegraph Company in 1857, sailing on the Agamemnon and Great Eastern during the cable-laying expeditions. He invented a mirror galvanometer and more importantly the siphon recorder, which, used as a very sensitive telegraph receiver, provided a permanent record of signals. He also laid down the design parameters of long submarine cables and discovered that the conductivity of copper was greatly affected by its purity. A major part of the success of the Atlantic cable in 1866 was due to Thomson, who received a knighthood for his contribution.Other instruments he designed included a quadrant electrostatic voltmeter to measure high voltages, and his "multi-cellular" instrument for low voltages. They could be used on alternating or direct current and were free from temperature errors. His balances for precision current measurement were widely used in standardizing laboratories.Thomson was a prolific writer of scientific papers on subjects across the whole spectrum of physics; between 1855 and 1866 he published some 110 papers, with a total during his life of over 600. In 1892 he was raised to the peerage as Baron Kelvin of Largs. By the time of his death he was looked upon as the "father" of British physics, but despite his outstanding achievements his later years were spent resisting change and progress.[br]Principal Honours and DistinctionsKnighted 1866. Created Lord Kelvin of Largs 1892. FRS 1851. President, Royal Society 1890–4. An original member of the Order of Merit 1902. President, Society of Telegraph Engineers 1874. President, Institution of Electrical Engineers 1889 and 1907. Royal Society Royal Medal 1856, Copley Medal 1883.Bibliography1872, Reprints of Papers on Electrostatics and Magnetism, London; 1911, Mathematical and Physical Papers, 6 vols, Cambridge (collections of Thomson's papers).Further ReadingSilvanus P.Thompson, 1910, The Life of William Thomson, Baron Kelvin of Largs, 2 vols, London (an uncritical biography).D.B.Wilson, 1987, Kelvin and Stokes: A Comparative Study in Victorian Physics, Bristol (provides a present-day commentary on all aspects of Thomson's work).J.G.Crowther, 1962, British Scientists of the 19th Century, London, pp. 199–257 (a short critical biography).GWBiographical history of technology > Thomson, Sir William, Lord Kelvin
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25 subject
∎ on the subject of au sujet de, à propos de;∎ this will be the subject of my next lecture ma prochaine conférence portera sur ce sujet;∎ to wander from the subject s'écarter du sujet, faire une digression;∎ let's come or get back to the subject revenons à nos moutons;∎ don't try and change the subject n'essaie pas de changer de sujet ou de détourner la conversation;∎ let's drop the subject parlons d'autre chose;∎ while we're on the subject à (ce) propos;∎ while we're on the subject of holidays puisque nous parlons de vacances;∎ that's a touchy subject c'est un sujet délicat(b) (of legal case, contract) objet m;∎ (in letters and memos) subject: recruitment of new staff objet: recrutement de personnel∎ the subject of her film/novel le sujet de son film/roman;∎ he always photographs his subjects in natural light il photographie toujours ses sujets en lumière naturelle∎ she's taking exams in four subjects elle passe des examens dans quatre matières;∎ I was always better at science subjects j'ai toujours été plus fort en sciences;∎ it's not really my subject ce n'est pas vraiment mon domaine;∎ that would be a good subject for a PhD thesis ce serait un bon sujet pour une thèse de doctorat∎ she is a British subject c'est une ressortissante britannique;∎ foreign subjects ressortissants mpl étrangers∎ she'd be a good subject for the new treatment elle serait un bon sujet pour le nouveau traitement;∎ subjects were tested for their reactions on a testé la réaction des sujets∎ he was the subject of much comment il a été l'objet de nombreux commentaires(a) (subordinate → people, country) assujetti, soumis;∎ they are subject to my authority ils sont placés sous mon autorité, ils dépendent de moi;∎ we are all subject to the rule of law nous sommes tous soumis à la loi;∎ subject states États mpl dépendants(b) (liable, prone)∎ subject to sujet à;∎ he is subject to frequent lung infections il est sujet à de fréquentes infections pulmonaires;∎ subject to attack exposé à l'attaque;∎ to be subject to violent changes of mood/fits of jealousy être sujet à de brusques sautes d'humeur/des crises de jalousie;∎ the terms are subject to alteration without notice les termes peuvent être modifiés sans préavis;∎ subject to tax imposable, assujetti à l'impôt;∎ the price is subject to a handling charge les frais de manutention sont en sus;∎ all trains will be subject to delay des retards sont à prévoir sur toutes les lignes(a) (country, people) soumettre, assujettir∎ to subject to soumettre à;∎ to subject sb/sth to an examination faire subir un examen à qn/qch, soumettre qn/qch à un examen;∎ the material was subjected to intense heat le matériau a été soumis ou exposé à une température très élevée;∎ I refuse to subject anyone to such indignities je refuse de faire subir de tels affronts à qui que ce soit;∎ their plans were subjected to much criticism leurs projets ont fait l'objet de nombreuses critiques∎ these are the rules, subject to revision voici le règlement, sous réserve de modification;∎ subject to your passing the exam à condition de réussir ou à condition que vous réussissiez l'examen;∎ it's all subject to her approval tout est subordonné à son approbation►► subject catalogue fichier m par matières;subject index index m des matières;
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