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1 variable-density film recording system
Универсальный англо-русский словарь > variable-density film recording system
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2 system
1) система || системный3) вчт операционная система; программа-супервизор5) вчт большая программа6) метод; способ; алгоритм•system halted — "система остановлена" ( экранное сообщение об остановке компьютера при наличии серьёзной ошибки)
- CPsystem- H-system- h-system- hydrogen-air/lead battery hybrid system- Ksystem- Lsystem- L*a*b* system- master/slave computer system- p-system- y-system- Δ-system -
3 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 -
4 log
I сокр. от
logarithm II сокр. от
logic1) матем. логика2) логика, логические схемыIII1) регистрация, запись || регистрировать, записывать2) вчт. журнал, файл регистрации; протокол || протоколировать3) диаграмма геофизических исследований в скважине, каротажная диаграмма || регистрировать каротажную диаграмму; проводить каротаж4) кернограмма5) мор. лаг6) логарифм7) радиограмма•to log out — выходить ( из системы);-
acoustic amplitude log
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acoustic character log
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acoustic log
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acoustic transit time log
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activation log
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analytical well log
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analytical log
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barked logs
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barrel log
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berthing log
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borehole compensated sonic log
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borehole log
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bottom log
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bottom speed log
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bumpy log
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butt log
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caliper log
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cased-hole log
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casing inspection log
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casing-collar log
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cement bond log
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chlorine log
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compensated neutron log
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computed analysis log
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computed dipmeter log
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computed log
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continuous velocity log
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conventional resistivity log
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correlation log
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cull log
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density formation compensated log
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density gamma-gamma log
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dipmeter log
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directional log
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Doppler log
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driller's log
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drill log
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drilling porosity log
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drilling time log
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dual induction log
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dual spacing neutron log
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dynamic-pressure log
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electrical log
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electric log
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electrical resistivity log
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electric resistivity log
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electromagnetic log
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electromagnetic propagation log
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electromagnetic thickness log
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epithermal neutron log
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error log
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film log
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flight log
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flow log
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focused resistivity log
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focused log
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focused microresistivity log
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formation factor log
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free fluid log
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gamma-gamma log
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gamma-ray log
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geomagnetic log
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green log
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ground log
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guarded electrode log
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guard log
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half log
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hand log
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impeller log
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induced gamma-ray log
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induced spectral gamma-ray log
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induction log
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job account log
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job log
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long log
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long-spaced sonic log
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magnetohydrodynamic log
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match log
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medium induction log
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merchantable log
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metric log
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microresistivity log
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microseismogram log
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microspherically focused log
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mud-analysis log
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natural gamma-ray log
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navigation log
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neutron lifetime log
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neutron log
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nuclear cement log
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nuclear flow log
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nuclear log
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nuclear magnetic resonance log
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open-hole log
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optical ice log
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optical log
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oxidation-reduction potential log
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patent log
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peeler logs
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photon log
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pipe-analysis log
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pitometer log
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plank log
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porosity-type log
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porosity log
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pressure log
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producibility index log
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production log
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propeller log
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proximity log
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pulsed neutron capture log
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pulsed neutron log
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quick-look log
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radioactive-tracer log
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radioactivity log
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recording log
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redox potential log
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redox log
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resistance log
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resistivity log
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result log
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sample log
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saw log
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scattered gamma-ray log
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short log
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side-wall acoustic log
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side-wall epithermal neutron log
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signature log
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sleeper log
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sniffer log
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sonic log
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spectral gamma-ray log
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spherically focused log
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spontaneous potential log
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square log
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standard log
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stop log
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strip log
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submerged log
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sunken log
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system log
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taffrail log
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telecommunication log
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temperature log
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test log
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thermal neutron decay-time log
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towed log
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tracer log
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transaction log
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tree-length log
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trumpet log
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ultra-long spaced electric log
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variable density log
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variable intensity log
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velocity log
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veneer log
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water speed log
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wave train log
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weather log
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well log
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wiggle trace log
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wire-line log
См. также в других словарях:
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