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1 сконструированная переменная
Русско-английский словарь по электронике > сконструированная переменная
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2 сконструированная переменная
Русско-английский словарь по радиоэлектронике > сконструированная переменная
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3 сконструированная переменная
General subject: constructed variableУниверсальный русско-английский словарь > сконструированная переменная
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4 один
Один, одно, одни - a (an), one; single (единственный); any one (любой из совокупности, набора)The single bound approximation can now be constructed. (Теперь можно построить график в виде одной граничной кривой.)CO and HC have a correlation coefficient of 0.96 and hence as a single independent variable.It was accepted, however, that any one bar would not be expected to perform satisfactorily over the whole of this wide range of overhung ratios.@на одну треть Завершён всего на 1/3-- The program to study this concept is approximately one-third complete. Выполнен на 1/3-- The program to study this concept is approximately one-third complete. @—не отличаются одно от другого более, чем на— одно этоРусско-английский научно-технический словарь переводчика > один
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5 одна
Один, одно, одни - a (an), one; single (единственный); any one (любой из совокупности, набора)The single bound approximation can now be constructed. (Теперь можно построить график в виде одной граничной кривой.)CO and HC have a correlation coefficient of 0.96 and hence as a single independent variable.It was accepted, however, that any one bar would not be expected to perform satisfactorily over the whole of this wide range of overhung ratios.@на одну треть Завершён всего на 1/3-- The program to study this concept is approximately one-third complete. Выполнен на 1/3-- The program to study this concept is approximately one-third complete. @—не отличаются одно от другого более, чем на— одно этоРусско-английский научно-технический словарь переводчика > одна
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6 одно
Один, одно, одни - a (an), one; single (единственный); any one (любой из совокупности, набора)The single bound approximation can now be constructed. (Теперь можно построить график в виде одной граничной кривой.)CO and HC have a correlation coefficient of 0.96 and hence as a single independent variable.It was accepted, however, that any one bar would not be expected to perform satisfactorily over the whole of this wide range of overhung ratios.@на одну треть Завершён всего на 1/3-- The program to study this concept is approximately one-third complete. Выполнен на 1/3-- The program to study this concept is approximately one-third complete. @—не отличаются одно от другого более, чем на— одно этоРусско-английский научно-технический словарь переводчика > одно
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7 одни
Один, одно, одни - a (an), one; single (единственный); any one (любой из совокупности, набора)The single bound approximation can now be constructed. (Теперь можно построить график в виде одной граничной кривой.)CO and HC have a correlation coefficient of 0.96 and hence as a single independent variable.It was accepted, however, that any one bar would not be expected to perform satisfactorily over the whole of this wide range of overhung ratios.@на одну треть Завершён всего на 1/3-- The program to study this concept is approximately one-third complete. Выполнен на 1/3-- The program to study this concept is approximately one-third complete. @—не отличаются одно от другого более, чем на— одно этоРусско-английский научно-технический словарь переводчика > одни
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8 обслуживание
Обслуживание - attendance, servicing (в ходе эксплуатации); maintenance (техническое, ремонтное)The program has been most useful in determining the turbine variable changes occurring under remote control or where operator attendance is limited.Insofar as possible, all the assemblies are constructed on a modular basis, so that they may be removed to permit easy servicing or replacement.Русско-английский научно-технический словарь переводчика > обслуживание
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9 Armstrong, Edwin Howard
[br]b. 18 December 1890 New York City, New York, USAd. 31 January 1954 New York City, New York, USA[br]American engineer who invented the regenerative and superheterodyne amplifiers and frequency modulation, all major contributions to radio communication and broadcasting.[br]Interested from childhood in anything mechanical, as a teenager Armstrong constructed a variety of wireless equipment in the attic of his parents' home, including spark-gap transmitters and receivers with iron-filing "coherer" detectors capable of producing weak Morse-code signals. In 1912, while still a student of engineering at Columbia University, he applied positive, i.e. regenerative, feedback to a Lee De Forest triode amplifier to just below the point of oscillation and obtained a gain of some 1,000 times, giving a receiver sensitivity very much greater than hitherto possible. Furthermore, by allowing the circuit to go into full oscillation he found he could generate stable continuous-waves, making possible the first reliable CW radio transmitter. Sadly, his claim to priority with this invention, for which he filed US patents in 1913, the year he graduated from Columbia, led to many years of litigation with De Forest, to whom the US Supreme Court finally, but unjustly, awarded the patent in 1934. The engineering world clearly did not agree with this decision, for the Institution of Radio Engineers did not revoke its previous award of a gold medal and he subsequently received the highest US scientific award, the Franklin Medal, for this discovery.During the First World War, after some time as an instructor at Columbia University, he joined the US Signal Corps laboratories in Paris, where in 1918 he invented the superheterodyne, a major contribution to radio-receiver design and for which he filed a patent in 1920. The principle of this circuit, which underlies virtually all modern radio, TV and radar reception, is that by using a local oscillator to convert, or "heterodyne", a wanted signal to a lower, fixed, "intermediate" frequency it is possible to obtain high amplification and selectivity without the need to "track" the tuning of numerous variable circuits.Returning to Columbia after the war and eventually becoming Professor of Electrical Engineering, he made a fortune from the sale of his patent rights and used part of his wealth to fund his own research into further problems in radio communication, particularly that of receiver noise. In 1933 he filed four patents covering the use of wide-band frequency modulation (FM) to achieve low-noise, high-fidelity sound broadcasting, but unable to interest RCA he eventually built a complete broadcast transmitter at his own expense in 1939 to prove the advantages of his system. Unfortunately, there followed another long battle to protect and exploit his patents, and exhausted and virtually ruined he took his own life in 1954, just as the use of FM became an established technique.[br]Principal Honours and DistinctionsInstitution of Radio Engineers Medal of Honour 1917. Franklin Medal 1937. IERE Edison Medal 1942. American Medal for Merit 1947.Bibliography1922, "Some recent developments in regenerative circuits", Proceedings of the Institute of Radio Engineers 10:244.1924, "The superheterodyne. Its origin, developments and some recent improvements", Proceedings of the Institute of Radio Engineers 12:549.1936, "A method of reducing disturbances in radio signalling by a system of frequency modulation", Proceedings of the Institute of Radio Engineers 24:689.Further ReadingL.Lessing, 1956, Man of High-Fidelity: Edwin Howard Armstrong, pbk 1969 (the only definitive biography).W.R.Maclaurin and R.J.Harman, 1949, Invention \& Innovation in the Radio Industry.J.R.Whitehead, 1950, Super-regenerative Receivers.A.N.Goldsmith, 1948, Frequency Modulation (for the background to the development of frequency modulation, in the form of a large collection of papers and an extensive bibliog raphy).KFBiographical history of technology > Armstrong, Edwin Howard
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10 Bachelier, Nicolas
SUBJECT AREA: Canals[br]b. 1485d. prior to December 1557 Toulouse, France[br]French surveyor, architect and mason.[br]Between 1515 and 1522 Francis I of France became ruler of part of Italy, including Milan. He discussed with Leonardo da Vinci the possibility of providing canals in France similar to those constructed or under construction in Italy. One idea was to provide a link between the Garonne at Toulouse and the Aude at Carcassonne. In 1539 Bachelier and his colleague Arnaud Casanove, who described themselves as "expert levellers", proposed a survey of the Toulouse to Carcassonne route and also suggested that barges could either float down the Garonne to Bordeaux or could travel along a canal dug parallel to the river. Francis I authorized them to do the work and approved the plans, which comprised a lock-free canal of variable depth, when they had completed them. However, their plans were hopelessly inaccurate, and nothing was done. In 1598 Henri IV re-examined the plans, but it was left to Pierre Paul Riquet in 1662 to reassess the concept of a Biscay-to- Mediterranean waterway.[br]Further ReadingH.Graillet, 1914, Nicolas Bachelier, imagier et maçon de Toulouse. B.Lavigne, 1879, Etude biographique sur Nicolas Bachelier.JHB -
11 Barnack, Oskar
SUBJECT AREA: Photography, film and optics[br]b. 1879 Berlin, Germanyd. January 1936 Wetzlar, Germany[br]German camera designer who conceived the first Leica camera and many subsequent models.[br]Oskar Barnack was an optical engineer, introspective and in poor health, when in 1910 he was invited through the good offices of his friend the mechanical engineer Emil Mechau, who worked for Ernst Leitz, to join the company at Wetzlar to work on research into microscope design. He was engaged after a week's trial, and on 2 January 1911 he was put in charge of microscope research. He was an enthusiastic photographer, but excursions with his large and heavy plate camera equipment taxed his strength. In 1912, Mechau was working on a revolutionary film projector design and needed film to test it. Barnack suggested that it was not necessary to buy an expensive commercial machine— why not make one? Leitz agreed, and Barnack constructed a 35 mm movie camera, which he used to cover events in and around Wetzlar.The exposure problems he encountered with the variable sensitivity of the cine film led him to consider the design of a still camera in which short lengths of film could be tested before shooting—a kind of exposure-meter camera. Dissatisfied with the poor picture quality of his first model, which took the standard cine frame of 18×24 mm, he built a new model in which the frame size was doubled to 36×24 mm. It used a simple focal-plane shutter adjustable to 1/500 of a second, and a Zeiss Milar lens of 42 mm focal length. This is what is now known as the UR-Leica. Using his new camera, 1/250 of the weight of his plate equipment, Barnack made many photographs around Wetzlar, giving postcard-sized prints of good quality.Ernst Leitz Junior was lent the camera for his trip in June 1914 to America, where he was urged to put it into production. Visiting George Eastman in Rochester, Leitz passed on Barnack's requests for film of finer grain and better quality. The First World War put an end to the chances of developing the design at that time. As Germany emerged from the postwar chaos, Leitz Junior, then in charge of the firm, took Barnack off microscope work to design prototypes for a commercial model. Leitz's Chief Optician, Max Berek, designed a new lens, the f3.5 Elmax, for the new camera. They settled on the name Leica, and the first production models went on show at the Leipzig Spring Fair in 1925. By the end of the year, 1,000 cameras had been shipped, despite costing about two months' good wages.The Leica camera established 35 mm still photography as a practical proposition, and film manufacturers began to create the special fine-grain films that Barnack had longed for. He continued to improve the design, and a succession of new Leica models appeared with new features, such as interchangeable lenses, coupled range-finders, 250 exposures. By the time of his sudden death in 1936, Barnack's life's work had forever transformed the nature of photography.[br]Further ReadingJ.Borgé and G.Borgé, 1977, Prestige de la, photographie.BC -
12 Hurter, Ferdinand
SUBJECT AREA: Photography, film and optics[br]b. 15 March 1844 Schaffhausen, Switzerlandd. 5 March 1898[br]Swiss chemist who, with Vero Charles Driffield, established the basis of modern sensitometry in England.[br]Ferdinand Hurter worked for three years as a dyer's apprentice before entering the Polytechnic in Zurich; he transferred to Heidelberg, where he graduated in 1866. A year later he secured an appointment as a chemist for the British alkali manufacturing company, Gaskell, Deacon \& Co. of Widnes, Cheshire. In 1871 he was joined at the company by the young engineer Vero Charles Driffield, who was to become his co-worker. Driffield had worked for a professional photographer before beginning his engineering apprenticeship and it was in 1876, when Hurter sought to draw on this experience, that the partnership began. At this time the speed of the new gelatine halide dry plates was expressed in terms of the speed of a wet-collodion plate, an almost worthless concept as the speed of a collodion plate was itself variable. Hurter and Driffield sought to place the study of photographic emulsions on a more scientific basis. They constructed an actinometer to measure the intensity of sunlight and in 1890 published the first of a series of papers on the sensitivity of photographic plates. They suggested methods of exposing a plate to lights of known intensities and measuring the densities obtained on development. They were able to plot curves based on density and exposure which became known as the H \& D curve. Hurter and Driffield's work allowed them to express the characteristics of an emulsion with a nomenclature which was soon adopted by British plate manufacturers. From the 1890s onwards most British-made plates were identified with H \& D ratings. Hurter and Driffield's partnership was ended by the former's death in 1898.[br]Further ReadingW.B.Ferguson (ed.), 1920, The Photographic Researches of Ferdinand Hurter \& Vero C. Driffield, London: Royal Photographic Society reprinted in facsimile, with a new introd. by W.Clark, 1974, New York (a memorial volume; the most complete account of Hurter and Driffield's work, includes a reprint of all their published papers).JW
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