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1 during (its) propagation along
Математика: при распространении поУниверсальный англо-русский словарь > during (its) propagation along
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2 during propagation along
Математика: (its) при распространении поУниверсальный англо-русский словарь > during propagation along
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3 при распространении по
•This equation determines the variation of the discontinuity strength in the Alfven mode as it propagates (or travels) (or during its propagation) along a tube.
Русско-английский научно-технический словарь переводчика > при распространении по
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4 при распространении по
Универсальный русско-английский словарь > при распространении по
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5 De Forest, Lee
SUBJECT AREA: Broadcasting, Electronics and information technology, Photography, film and optics, Recording, Telecommunications[br]b. 26 August 1873 Council Bluffs, Iowa, USAd. 30 June 1961 Hollywood, California, USA[br]American electrical engineer and inventor principally known for his invention of the Audion, or triode, vacuum tube; also a pioneer of sound in the cinema.[br]De Forest was born into the family of a Congregational minister that moved to Alabama in 1879 when the father became President of a college for African-Americans; this was a position that led to the family's social ostracism by the white community. By the time he was 13 years old, De Forest was already a keen mechanical inventor, and in 1893, rejecting his father's plan for him to become a clergyman, he entered the Sheffield Scientific School of Yale University. Following his first degree, he went on to study the propagation of electromagnetic waves, gaining a PhD in physics in 1899 for his thesis on the "Reflection of Hertzian Waves from the Ends of Parallel Wires", probably the first US thesis in the field of radio.He then joined the Western Electric Company in Chicago where he helped develop the infant technology of wireless, working his way up from a modest post in the production area to a position in the experimental laboratory. There, working alone after normal working hours, he developed a detector of electromagnetic waves based on an electrolytic device similar to that already invented by Fleming in England. Recognizing his talents, a number of financial backers enabled him to set up his own business in 1902 under the name of De Forest Wireless Telegraphy Company; he was soon demonstrating wireless telegraphy to interested parties and entering into competition with the American Marconi Company.Despite the failure of this company because of fraud by his partners, he continued his experiments; in 1907, by adding a third electrode, a wire mesh, between the anode and cathode of the thermionic diode invented by Fleming in 1904, he was able to produce the amplifying device now known as the triode valve and achieve a sensitivity of radio-signal reception much greater than possible with the passive carborundum and electrolytic detectors hitherto available. Patented under the name Audion, this new vacuum device was soon successfully used for experimental broadcasts of music and speech in New York and Paris. The invention of the Audion has been described as the beginning of the electronic era. Although much development work was required before its full potential was realized, the Audion opened the way to progress in all areas of sound transmission, recording and reproduction. The patent was challenged by Fleming and it was not until 1943 that De Forest's claim was finally recognized.Overcoming the near failure of his new company, the De Forest Radio Telephone Company, as well as unsuccessful charges of fraudulent promotion of the Audion, he continued to exploit the potential of his invention. By 1912 he had used transformer-coupling of several Audion stages to achieve high gain at radio frequencies, making long-distance communication a practical proposition, and had applied positive feedback from the Audion output anode to its input grid to realize a stable transmitter oscillator and modulator. These successes led to prolonged patent litigation with Edwin Armstrong and others, and he eventually sold the manufacturing rights, in retrospect often for a pittance.During the early 1920s De Forest began a fruitful association with T.W.Case, who for around ten years had been working to perfect a moving-picture sound system. De Forest claimed to have had an interest in sound films as early as 1900, and Case now began to supply him with photoelectric cells and primitive sound cameras. He eventually devised a variable-density sound-on-film system utilizing a glow-discharge modulator, the Photion. By 1926 De Forest's Phonofilm had been successfully demonstrated in over fifty theatres and this system became the basis of Movietone. Though his ideas were on the right lines, the technology was insufficiently developed and it was left to others to produce a system acceptable to the film industry. However, De Forest had played a key role in transforming the nature of the film industry; within a space of five years the production of silent films had all but ceased.In the following decade De Forest applied the Audion to the development of medical diathermy. Finally, after spending most of his working life as an independent inventor and entrepreneur, he worked for a time during the Second World War at the Bell Telephone Laboratories on military applications of electronics.[br]Principal Honours and DistinctionsInstitute of Electronic and Radio Engineers Medal of Honour 1922. President, Institute of Electronic and Radio Engineers 1930. Institute of Electrical and Electronics Engineers Edison Medal 1946.Bibliography1904, "Electrolytic detectors", Electrician 54:94 (describes the electrolytic detector). 1907, US patent no. 841,387 (the Audion).1950, Father of Radio, Chicago: WIlcox \& Follett (autobiography).De Forest gave his own account of the development of his sound-on-film system in a series of articles: 1923. "The Phonofilm", Transactions of the Society of Motion Picture Engineers 16 (May): 61–75; 1924. "Phonofilm progress", Transactions of the Society of Motion Picture Engineers 20:17–19; 1927, "Recent developments in the Phonofilm", Transactions of the Society of Motion Picture Engineers 27:64–76; 1941, "Pioneering in talking pictures", Journal of the Society of Motion Picture Engineers 36 (January): 41–9.Further ReadingG.Carneal, 1930, A Conqueror of Space (biography).I.Levine, 1964, Electronics Pioneer, Lee De Forest (biography).E.I.Sponable, 1947, "Historical development of sound films", Journal of the Society of Motion Picture Engineers 48 (April): 275–303 (an authoritative account of De Forest's sound-film work, by Case's assistant).W.R.McLaurin, 1949, Invention and Innovation in the Radio Industry.C.F.Booth, 1955, "Fleming and De Forest. An appreciation", in Thermionic Valves 1904– 1954, IEE.V.J.Phillips, 1980, Early Radio Detectors, London: Peter Peregrinus.KF / JW -
6 spread
A n1 ( dissemination) (of disease, drugs) propagation f ; (of news, information) diffusion f ; (of democracy, infection, weapons) progression f ; ( of education) généralisation f ; the spread of sth to l'extension f de qch à [group, area, place] ;2 (extent, range) (of wings, branches) envergure f ; ( of arch) ouverture f, portée f ; (of products, services) éventail m ; the spread in terms of age in the class is quite wide les membres de la classe sont d'âge varié ; the spread of the festival is enormous le programme du festival est très étendu ; spread of sail ou canvas Naut déploiement m de voile ;4 Culin pâte f à tartiner ; chocolate spread pâte f à tartiner au chocolat ; salmon/shrimp spread beurre m de saumon/crevette ; low-fat spread ( margarine) margarine f allégée ; fruit spread confiture f à teneur en sucre réduite ;5 ( assortment of dishes) festin m ; they laid on a magnificent spread ils ont servi un véritable festin ;6 US Agric grand ranch m.1 (open out, unfold) étendre [cloth, map, rug, newspaper] (on, over sur) ; ( lay out) étaler [cloth, newspaper, map] (on, over sur) ; ( put) mettre [cloth, sheet, newspaper] ; we spread dust sheets over the furniture nous avons mis des housses sur les meubles ; to spread a cloth on the table mettre une nappe sur la table ; she spread her arms wide in greeting elle a ouvert grand les bras en signe de bienvenue ; the peacock spread its tail/its wings le paon a fait la roue/a déployé ses ailes ; spread 'em ○ ! ( police command) écartez les bras et les jambes! ; ⇒ wing ;2 ( apply in layer) étaler [butter, jam, paste, glue] (on, over sur) ; spread the butter thinly on the bread étaler une mince couche de beurre sur le pain ;3 ( cover with layer) to spread some bread with jam tartiner du pain avec de la confiture ; to spread a surface with glue enduire une surface de colle ; a biscuit spread with honey un biscuit recouvert de miel ; the table was spread for lunch la table était mise pour le déjeuner ; the path had been spread with gravel le chemin avait été recouvert de gravillons ;4 ( distribute over area) disperser [forces, troops] ; étaler [cards, documents] ; épandre [fertilizer] ; répartir, partager [workload, responsibility] ; to spread grit ou sand sabler ; to spread mud everywhere mettre de la boue partout ; the resources must be evenly spread between the two projects les ressources doivent être réparties or partagées de façon égale entre les deux projets ; we have to spread our resources very thin(ly) nous devons ménager nos ressources ; my interests are spread over several historical periods je m'intéresse à plusieurs périodes historiques ;5 ( also spread out) (distribute in time, space out) étaler, échelonner [payments, meetings, visits, cost] (over sur) ; I'd like to spread the course (out) over two years j'aimerais étaler les cours sur deux ans ;6 (diffuse, cause to proliferate) propager [disease, infection, germs, fire] ; propager [religion] ; répandre, semer [fear, confusion, panic] ; faire courir, faire circuler [rumour, story, lie, scandal] ; a strong wind helped to spread the blaze un vent fort a contribué à propager l'incendie ; to spread sth to sb transmettre [qch] à qn [infection, news] ; wind spread the fire to neighbouring buildings le vent a poussé l'incendie vers les bâtiments voisins ; can you spread the word? tu peux faire passer? ; to spread the word that annoncer que ; word had been spread among the staff that le bruit courait parmi les membres du personnel que ; to spread the Word Relig prêcher la bonne parole.1 [butter, margarine, jam, glue] s'étaler ; ‘spreads straight from the fridge’ ‘s'étale facilement même au sortir du réfrigérateur’ ;2 (cover area or time, extend) [forest, desert, drought, network] s'étendre (over sur) ; [experience] s'étendre (over sur) ; training can spread over several months la formation peut s'étendre sur plusieurs mois ;3 (proliferate, become more widespread) [disease, infection, germs] se propager, gagner du terrain ; [fire] s'étendre, gagner du terrain ; [fear, confusion, panic] se propager ; [rumour, story, scandal] circuler, se répandre ; [stain] s'étaler ; [pain] se propager ; the rumour was spreading that le bruit courait que ; to spread over sth [epidemic, disease] se propager dans, s'étendre à [area] ; the news spread rapidly over the whole town la nouvelle s'est vite répandue dans toute la ville ; the stain/the damp has spread over the whole wall la tache/l'humidité s'est étalée sur tout le mur ; to spread to [fire, disease, rioting, strike] s'étendre à, gagner [building, region] ; the panic spread to the people in the street la panique a gagné les gens qui se trouvaient dans la rue ; the fire spread from one room to another l'incendie s'est propagé d'une pièce à l'autre ; the disease spread from the liver to the kidney la maladie s'est propagée du foie aux reins ; the weeds spread from the garden to the path les mauvaises herbes du jardin ont gagné le chemin ; rain will spread to the north/to most regions during the night la pluie va s'étendre vers le nord/à la plupart des régions pendant la nuit.E v refl ( prét, pp spread) to spread oneself ( take up space) prendre ses aises ; (talk, write at length) s'étendre ; he spread himself over the sofa il s'est étalé sur le canapé ; to spread oneself too thin fig faire trop de choses à la fois.■ spread around, spread about:▶ spread [sth] around faire circuler [rumour] ; he's been spreading it around that il a fait courir le bruit que.■ spread out:▶ spread out [group] se disperser (over sur) ; [wings, tail] se déployer ; [landscape, town, woods] s'étendre ; spread out! dispersez-vous! ;▶ spread [sth] out, spread out [sth]1 (open out, unfold) étendre [cloth, map, rug, newspaper] (on, over sur) ; (lay, flatten out) étaler [cloth, newspaper, map] (on, over sur) ; she lay spread out on the carpet elle était étendue (de tout son long) sur la moquette ; the whole town was spread out below them la ville tout entière s'étendait à leurs pieds ;2 ( distribute over area) étaler [cards, maps, trinkets] ; disperser [forces, troops] ; the houses were spread out all over the valley les maisons étaient dispersées or disséminées dans toute la vallée ; you're too spread out, I can't get you all in the photo vous êtes trop éloignés les uns des autres, vous n'êtes pas tous dans le cadre.
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