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1 корпоративная телекоммуникационная система
Communications: business telecommunications systemУниверсальный русско-английский словарь > корпоративная телекоммуникационная система
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2 Система поддержки деятельности предприятия
Telecommunications: BSS, Business support systemУниверсальный русско-английский словарь > Система поддержки деятельности предприятия
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3 система бизнес-поддержки
Telecommunications: Business Support SystemУниверсальный русско-английский словарь > система бизнес-поддержки
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4 система поддержки бизнес-деятельности (операторов связи)
Telecommunications: Business Support SystemУниверсальный русско-английский словарь > система поддержки бизнес-деятельности (операторов связи)
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5 система поддержки бизнес-деятельности
Telecommunications: (операторов связи) Business Support SystemУниверсальный русско-английский словарь > система поддержки бизнес-деятельности
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6 система дальней связи
1) Military: long-haul communications system, telecommunications system2) Engineering: air space communications complex3) Telecommunications: long-distance communication system, long-range system4) Information technology: long-haul system5) Atomic energy: long distance communication system6) Business: telecommunications network7) Makarov: telecommunication systemУниверсальный русско-английский словарь > система дальней связи
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7 система связи
1) Military: communications system2) Engineering: communication, communication system, signal communications system, telecommunication system (дальней)3) Accounting: communication (напр. телефон)4) Telecommunications: media, route, signalling system, telecommunications system5) Mechanics: coupling system6) Patents: communication (data) system7) Business: communications8) Automation: transmission system9) SAP.tech. processing system, processor -
8 система обработки данных
1) Engineering: data handling system, data processing system, processing system2) Telecommunications: (предварительной) data data-reduction system, (предварительной) data processing system, (предварительной) data-handling system, digital data system3) Electronics: data reduction system, data-handling system4) Information technology: data system5) Astronautics: data-reduction system6) Business: DP system (data processing system)7) Oil&Gas technology data-processing system8) Network technologies: DPSУниверсальный русско-английский словарь > система обработки данных
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9 система сбора информации
1) Military: information acquisition system2) Economy: data collection vehicle3) Telecommunications: information gathering system4) Geophysics: data collection system, data gathering system5) Mechanics: information-gathering system6) Ecology: DCS7) Business: reporting systemУниверсальный русско-английский словарь > система сбора информации
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10 распределительная система
1) Engineering: distributing system2) Mathematics: distribution system3) Telecommunications: distribution manifold4) Business: distributive system5) General subject: distribution synodicУниверсальный русско-английский словарь > распределительная система
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11 Informations- und Telekommunikationssystem-Kauffrau
finformation and telecommunications system business womanDeutsch-Englisches Wörterbuch > Informations- und Telekommunikationssystem-Kauffrau
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12 cистема поддержки операционной и бизнес-деятельности операторов связи
Telecommunications: BOSS (Business and Operation Support System)Универсальный русско-английский словарь > cистема поддержки операционной и бизнес-деятельности операторов связи
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13 Система поддержки операционной и бизнес-деятельности операторов связи (BOSS)
Telecommunications: Business and Operation Support SystemУниверсальный русско-английский словарь > Система поддержки операционной и бизнес-деятельности операторов связи (BOSS)
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14 Система поддержки операционной и бизнес-деятельности операторов связи
Telecommunications: (BOSS) Business and Operation Support SystemУниверсальный русско-английский словарь > Система поддержки операционной и бизнес-деятельности операторов связи
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15 telecomunicación
f.telecommunication, telecom.* * *1 telecommunication* * *noun f.* * ** * *femenino telecommunication* * *Ex. Developments in computing and telecommunication have brought about fundamental changes in worldwide business practices.----* cable de telecomunicaciones = telecommunications cable.* compañía de correos, teléfonos y telecomunicaciones = PTT (Posts, Telephones and Telecommunications).* Compañía de Telecomunicaciones Británica = British Telecom (BT).* empresa de telecomunicaciones = bureau [bureaux, -pl.], computer bureau.* enlace de telecomunicaciones = telecommunications link.* industria de las telecomunicaciones, la = telecommunications industry, the.* ingeniero de telecomunicaciones = telecom engineer.* modem de telecomunicaciones = telecommunication modem.* red de telecomunicaciones = telecommunications network, trunking network.* sistema de telecomunicaciones = telecommunication system.* tarifa de telecomunicación = telecommunication charge.* tecnología de telecomunicaciones = telecommunications technology.* telecomunicaciones = connectivity, telecommunications, telecom.* * *femenino telecommunication* * *Ex: Developments in computing and telecommunication have brought about fundamental changes in worldwide business practices.
* cable de telecomunicaciones = telecommunications cable.* compañía de correos, teléfonos y telecomunicaciones = PTT (Posts, Telephones and Telecommunications).* Compañía de Telecomunicaciones Británica = British Telecom (BT).* empresa de telecomunicaciones = bureau [bureaux, -pl.], computer bureau.* enlace de telecomunicaciones = telecommunications link.* industria de las telecomunicaciones, la = telecommunications industry, the.* ingeniero de telecomunicaciones = telecom engineer.* modem de telecomunicaciones = telecommunication modem.* red de telecomunicaciones = telecommunications network, trunking network.* sistema de telecomunicaciones = telecommunication system.* tarifa de telecomunicación = telecommunication charge.* tecnología de telecomunicaciones = telecommunications technology.* telecomunicaciones = connectivity, telecommunications, telecom.* * *telecommunication* * *
telecomunicación sustantivo femenino
telecommunication
* * *1. [comunicación] telecommunication* * * -
16 cercano
adj.1 close, immediate, near, nearby.2 close, dear.* * *► adjetivo1 (inmediato) near, close2 (vecino) nearby, neighbouring (US neighboring)3 (pariente) close\el Cercano Oriente the Near East* * *(f. - cercana)adj.close, near, nearby* * *ADJ1) [lugar] nearby•
cercano a — close to, near, near toun hotel cercano al aeropuerto — a hotel close to o near (to) the airport
2) [amigo, pariente] close•
cercano a — close topersonas cercanas a la organización terrorista — people closely linked to the terrorist organization
3) [en el tiempo]ahora, cuando está cercano el primer aniversario de su muerte — now, as the first anniversary of her death approaches
* * *- na adjetivo1)a) ( en el espacio) nearby, neighboring*cercano a algo — near something, close to something
los pueblos cercanos a Durango — the villages in the vicinity of o close to o near Durango
una suma cercana al millón — an amount close to o close on a million
b) ( en el tiempo) close, near2) <pariente/amigo> close* * *= adjacent, adjoining, close [closer -comp., closest -sup.], immediate, nearby [near-by], neighbouring [neighboring, -USA], near at hand, close at hand, in sight, over the horizon, on the horizon, close-by, proximate, near [nearer -comp., nearest -sup.], within sight, within range.Ex. Before him there are the two items to be joined, projected onto adjacent viewing positions.Ex. The library is poorly sited outside the shopping centre and on the brow of a hill, and faces competition from adjoining libraries.Ex. Superior cataloguing may result, since more consistency and closer adherence to standard codes are likely to emerge with cataloguers who spend all of their time cataloguing, than with a librarian who tackles cataloguing as one of various professional tasks.Ex. This system offers immediate access when required by users and staff, preferably several users at the same time.Ex. An earlier leakage had prompted library staff to make arrangements with a nearby firm of book conservation specialists in the event of a further disaster.Ex. The philosophical, brooding Hippopotamians have suffered many attacks by the neighbouring Crocs who are well known for their purposefulness and efficiency.Ex. The firm does not have to be near at hand, but there must be plenty of cooperation and consultation as to selection of stock.Ex. Material needed daily should be stored close at hand.Ex. The trend is definitely towards the electronic submission, but the point where this method will entirely supplant the others is not yet in sight.Ex. This article surveys the changes which have already occurred and those which are just over the horizon.Ex. The author concludes with descriptions of advances in the technology currently on the horizon.Ex. The second phase of the study entailed interviewing at close-by universities in the Midwest.Ex. For example, Literature and Language should be proximate, as should Commerce and Economics and Business, Psychology and Medicine, and so on.Ex. He was a loner himself, a small-town country boy who spent most of his time wandering about the hills and fields near his home.Ex. As the major US telecommunications service providers install fibre optic cable, the availability of interactive video is within sight.Ex. 77% of the world's population lives within range of a mobile network.----* cercano a = approaching, in close proximity to.* Cercano Oriente = Near East.* cercano uno del otro = in close proximity.* del Cercano Oriente = Near-Eastern.* en el futuro cercano = in the foreseeable future.* en un futuro más o menos cercano = in the near future.* en un futuro muy cercano = in the very near future.* en un período más o menos cercano = in the near future.* experiencia cercana a la muerte = near death experience.* futuro cercano, el = near future, the.* lado más cercano, el = near side, the.* lo más cercano a = the nearest thing to.* pariente cercano = close relation.* redondear al número entero más cercano = round up to + the nearest whole number.* * *- na adjetivo1)a) ( en el espacio) nearby, neighboring*cercano a algo — near something, close to something
los pueblos cercanos a Durango — the villages in the vicinity of o close to o near Durango
una suma cercana al millón — an amount close to o close on a million
b) ( en el tiempo) close, near2) <pariente/amigo> close* * *= adjacent, adjoining, close [closer -comp., closest -sup.], immediate, nearby [near-by], neighbouring [neighboring, -USA], near at hand, close at hand, in sight, over the horizon, on the horizon, close-by, proximate, near [nearer -comp., nearest -sup.], within sight, within range.Ex: Before him there are the two items to be joined, projected onto adjacent viewing positions.
Ex: The library is poorly sited outside the shopping centre and on the brow of a hill, and faces competition from adjoining libraries.Ex: Superior cataloguing may result, since more consistency and closer adherence to standard codes are likely to emerge with cataloguers who spend all of their time cataloguing, than with a librarian who tackles cataloguing as one of various professional tasks.Ex: This system offers immediate access when required by users and staff, preferably several users at the same time.Ex: An earlier leakage had prompted library staff to make arrangements with a nearby firm of book conservation specialists in the event of a further disaster.Ex: The philosophical, brooding Hippopotamians have suffered many attacks by the neighbouring Crocs who are well known for their purposefulness and efficiency.Ex: The firm does not have to be near at hand, but there must be plenty of cooperation and consultation as to selection of stock.Ex: Material needed daily should be stored close at hand.Ex: The trend is definitely towards the electronic submission, but the point where this method will entirely supplant the others is not yet in sight.Ex: This article surveys the changes which have already occurred and those which are just over the horizon.Ex: The author concludes with descriptions of advances in the technology currently on the horizon.Ex: The second phase of the study entailed interviewing at close-by universities in the Midwest.Ex: For example, Literature and Language should be proximate, as should Commerce and Economics and Business, Psychology and Medicine, and so on.Ex: He was a loner himself, a small-town country boy who spent most of his time wandering about the hills and fields near his home.Ex: As the major US telecommunications service providers install fibre optic cable, the availability of interactive video is within sight.Ex: 77% of the world's population lives within range of a mobile network.* cercano a = approaching, in close proximity to.* Cercano Oriente = Near East.* cercano uno del otro = in close proximity.* del Cercano Oriente = Near-Eastern.* en el futuro cercano = in the foreseeable future.* en un futuro más o menos cercano = in the near future.* en un futuro muy cercano = in the very near future.* en un período más o menos cercano = in the near future.* experiencia cercana a la muerte = near death experience.* futuro cercano, el = near future, the.* lado más cercano, el = near side, the.* lo más cercano a = the nearest thing to.* pariente cercano = close relation.* redondear al número entero más cercano = round up to + the nearest whole number.* * *cercano -naA1 (en el espacio) nearby, neighboring* cercano A algo near sth, close TO sthlos pueblos cercanos a Durango the villages in the vicinity of o close to o near Durangouna suma cercana al millón an amount close to o close on a million2 (en el tiempo) close, nearen fecha cercana sooncercano A algo close TO sthse sentía cercano a su fin he felt the end was near o close, he felt he was close to the endCompuesto:el Cercano Oriente the Near EastB ‹pariente/amigo› close* * *
cercano◊ -na adjetivo
1
cercano a algo near sth, close to sth;
cercano a algo close to sth
2 ‹pariente/amigo› close
cercano,-a adjetivo
1 close, nearby
un pueblo cercano, a nearby village
2 (pariente) close
3 Cercano Oriente, Near East
' cercano' also found in these entries:
Spanish:
cercana
- ir
- próxima
- próximo
- vecina
- vecino
- futuro
English:
close
- early
- immediate
- near
- nearby
- nursery
- offshore
- proximate
- next
* * *cercano, -a adj1. [en el espacio] nearby;cercano a near, close toel Cercano Oriente the Near East2. [en el tiempo] near;cercano a near, close to3. [con cifras] close;pagaron un precio cercano a los 2 millones they paid close to o nearly 2 million4. [pariente, amigo, colaborador] close;según fuentes cercanas a la familia real,… according to sources close to the royal family,…5. [en contenido]una obra más cercana a la tragedia que a la comedia a play that is closer to tragedy than to comedy* * *adj nearby;cercano a close to, near to* * *cercano, -na adj: near, close* * *cercano adj1. (en distancia) near / nearby2. (una persona) close -
17 Edison, Thomas Alva
SUBJECT AREA: Architecture and building, Automotive engineering, Electricity, Electronics and information technology, Metallurgy, Photography, film and optics, Public utilities, Recording, Telecommunications[br]b. 11 February 1847 Milan, Ohio, USAd. 18 October 1931 Glenmont[br]American inventor and pioneer electrical developer.[br]He was the son of Samuel Edison, who was in the timber business. His schooling was delayed due to scarlet fever until 1855, when he was 8½ years old, but he was an avid reader. By the age of 14 he had a job as a newsboy on the railway from Port Huron to Detroit, a distance of sixty-three miles (101 km). He worked a fourteen-hour day with a stopover of five hours, which he spent in the Detroit Free Library. He also sold sweets on the train and, later, fruit and vegetables, and was soon making a profit of $20 a week. He then started two stores in Port Huron and used a spare freight car as a laboratory. He added a hand-printing press to produce 400 copies weekly of The Grand Trunk Herald, most of which he compiled and edited himself. He set himself to learn telegraphy from the station agent at Mount Clements, whose son he had saved from being run over by a freight car.At the age of 16 he became a telegraphist at Port Huron. In 1863 he became railway telegraphist at the busy Stratford Junction of the Grand Trunk Railroad, arranging a clock with a notched wheel to give the hourly signal which was to prove that he was awake and at his post! He left hurriedly after failing to hold a train which was nearly involved in a head-on collision. He usually worked the night shift, allowing himself time for experiments during the day. His first invention was an arrangement of two Morse registers so that a high-speed input could be decoded at a slower speed. Moving from place to place he held many positions as a telegraphist. In Boston he invented an automatic vote recorder for Congress and patented it, but the idea was rejected. This was the first of a total of 1180 patents that he was to take out during his lifetime. After six years he resigned from the Western Union Company to devote all his time to invention, his next idea being an improved ticker-tape machine for stockbrokers. He developed a duplex telegraphy system, but this was turned down by the Western Union Company. He then moved to New York.Edison found accommodation in the battery room of Law's Gold Reporting Company, sleeping in the cellar, and there his repair of a broken transmitter marked him as someone of special talents. His superior soon resigned, and he was promoted with a salary of $300 a month. Western Union paid him $40,000 for the sole rights on future improvements on the duplex telegraph, and he moved to Ward Street, Newark, New Jersey, where he employed a gathering of specialist engineers. Within a year, he married one of his employees, Mary Stilwell, when she was only 16: a daughter, Marion, was born in 1872, and two sons, Thomas and William, in 1876 and 1879, respectively.He continued to work on the automatic telegraph, a device to send out messages faster than they could be tapped out by hand: that is, over fifty words per minute or so. An earlier machine by Alexander Bain worked at up to 400 words per minute, but was not good over long distances. Edison agreed to work on improving this feature of Bain's machine for the Automatic Telegraph Company (ATC) for $40,000. He improved it to a working speed of 500 words per minute and ran a test between Washington and New York. Hoping to sell their equipment to the Post Office in Britain, ATC sent Edison to England in 1873 to negotiate. A 500-word message was to be sent from Liverpool to London every half-hour for six hours, followed by tests on 2,200 miles (3,540 km) of cable at Greenwich. Only confused results were obtained due to induction in the cable, which lay coiled in a water tank. Edison returned to New York, where he worked on his quadruplex telegraph system, tests of which proved a success between New York and Albany in December 1874. Unfortunately, simultaneous negotiation with Western Union and ATC resulted in a lawsuit.Alexander Graham Bell was granted a patent for a telephone in March 1876 while Edison was still working on the same idea. His improvements allowed the device to operate over a distance of hundreds of miles instead of only a few miles. Tests were carried out over the 106 miles (170 km) between New York and Philadelphia. Edison applied for a patent on the carbon-button transmitter in April 1877, Western Union agreeing to pay him $6,000 a year for the seventeen-year duration of the patent. In these years he was also working on the development of the electric lamp and on a duplicating machine which would make up to 3,000 copies from a stencil. In 1876–7 he moved from Newark to Menlo Park, twenty-four miles (39 km) from New York on the Pennsylvania Railway, near Elizabeth. He had bought a house there around which he built the premises that would become his "inventions factory". It was there that he began the use of his 200- page pocket notebooks, each of which lasted him about two weeks, so prolific were his ideas. When he died he left 3,400 of them filled with notes and sketches.Late in 1877 he applied for a patent for a phonograph which was granted on 19 February 1878, and by the end of the year he had formed a company to manufacture this totally new product. At the time, Edison saw the device primarily as a business aid rather than for entertainment, rather as a dictating machine. In August 1878 he was granted a British patent. In July 1878 he tried to measure the heat from the solar corona at a solar eclipse viewed from Rawlins, Wyoming, but his "tasimeter" was too sensitive.Probably his greatest achievement was "The Subdivision of the Electric Light" or the "glow bulb". He tried many materials for the filament before settling on carbon. He gave a demonstration of electric light by lighting up Menlo Park and inviting the public. Edison was, of course, faced with the problem of inventing and producing all the ancillaries which go to make up the electrical system of generation and distribution-meters, fuses, insulation, switches, cabling—even generators had to be designed and built; everything was new. He started a number of manufacturing companies to produce the various components needed.In 1881 he built the world's largest generator, which weighed 27 tons, to light 1,200 lamps at the Paris Exhibition. It was later moved to England to be used in the world's first central power station with steam engine drive at Holborn Viaduct, London. In September 1882 he started up his Pearl Street Generating Station in New York, which led to a worldwide increase in the application of electric power, particularly for lighting. At the same time as these developments, he built a 1,300yd (1,190m) electric railway at Menlo Park.On 9 August 1884 his wife died of typhoid. Using his telegraphic skills, he proposed to 19-year-old Mina Miller in Morse code while in the company of others on a train. He married her in February 1885 before buying a new house and estate at West Orange, New Jersey, building a new laboratory not far away in the Orange Valley.Edison used direct current which was limited to around 250 volts. Alternating current was largely developed by George Westinghouse and Nicola Tesla, using transformers to step up the current to a higher voltage for long-distance transmission. The use of AC gradually overtook the Edison DC system.In autumn 1888 he patented a form of cinephotography, the kinetoscope, obtaining film-stock from George Eastman. In 1893 he set up the first film studio, which was pivoted so as to catch the sun, with a hinged roof which could be raised. In 1894 kinetoscope parlours with "peep shows" were starting up in cities all over America. Competition came from the Latham Brothers with a screen-projection machine, which Edison answered with his "Vitascope", shown in New York in 1896. This showed pictures with accompanying sound, but there was some difficulty with synchronization. Edison also experimented with captions at this early date.In 1880 he filed a patent for a magnetic ore separator, the first of nearly sixty. He bought up deposits of low-grade iron ore which had been developed in the north of New Jersey. The process was a commercial success until the discovery of iron-rich ore in Minnesota rendered it uneconomic and uncompetitive. In 1898 cement rock was discovered in New Village, west of West Orange. Edison bought the land and started cement manufacture, using kilns twice the normal length and using half as much fuel to heat them as the normal type of kiln. In 1893 he met Henry Ford, who was building his second car, at an Edison convention. This started him on the development of a battery for an electric car on which he made over 9,000 experiments. In 1903 he sold his patent for wireless telegraphy "for a song" to Guglielmo Marconi.In 1910 Edison designed a prefabricated concrete house. In December 1914 fire destroyed three-quarters of the West Orange plant, but it was at once rebuilt, and with the threat of war Edison started to set up his own plants for making all the chemicals that he had previously been buying from Europe, such as carbolic acid, phenol, benzol, aniline dyes, etc. He was appointed President of the Navy Consulting Board, for whom, he said, he made some forty-five inventions, "but they were pigeonholed, every one of them". Thus did Edison find that the Navy did not take kindly to civilian interference.In 1927 he started the Edison Botanic Research Company, founded with similar investment from Ford and Firestone with the object of finding a substitute for overseas-produced rubber. In the first year he tested no fewer than 3,327 possible plants, in the second year, over 1,400, eventually developing a variety of Golden Rod which grew to 14 ft (4.3 m) in height. However, all this effort and money was wasted, due to the discovery of synthetic rubber.In October 1929 he was present at Henry Ford's opening of his Dearborn Museum to celebrate the fiftieth anniversary of the incandescent lamp, including a replica of the Menlo Park laboratory. He was awarded the Congressional Gold Medal and was elected to the American Academy of Sciences. He died in 1931 at his home, Glenmont; throughout the USA, lights were dimmed temporarily on the day of his funeral.[br]Principal Honours and DistinctionsMember of the American Academy of Sciences. Congressional Gold Medal.Further ReadingM.Josephson, 1951, Edison, Eyre \& Spottiswode.R.W.Clark, 1977, Edison, the Man who Made the Future, Macdonald \& Jane.IMcN -
18 информационная система
1) Computers: information management system2) Military: reporting system3) Engineering: data system, information processing system, information system4) Mathematics: intelligence system5) Polygraphy: information (management) system6) Telecommunications: Radio Data system7) Information technology: IT system, business system8) Astronautics: ARTEMIS information system (АРТЕМИС)9) Network technologies: IS10) Programming: (управления данными) information system (система, организующая обработку информации о предметной области и ее хранение, см. ГОСТ Р ИСО/МЭК ТО 10032-2007)11) Aviation medicine: informational system12) SAP.tech. info system, info. sys.Универсальный русско-английский словарь > информационная система
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19 Strowger, Almon Brown
SUBJECT AREA: Telecommunications[br]b. 19 October 1839 Penfield, New York, USAd. 26 May 1902 St Petersburg, Florida, USA[br]American soldier, teacher and undertaker who developed the first commercially successful automatic telephone-switching system.[br]Enlisting in the 8th New York Cavalry on his twenty-second birthday at the beginning of the American Civil War, Strowger reached the rank of Second Lieutenant. After the war he taught in a number of schools, including that where he had been a pupil, then bought an undertaking business in North Topeka, Kansas. After the death of his wife, he remarried and moved the business to Kansas City.In 1887, suspecting that the local telephone operator was diverting his potential clients to a rival, he devised a cardboard mock-up of an automatic switching mechanism comprising ten layers of ten contacts, in which electromagnets would be used to lift and rotate the contact wiper arm and thus connect the caller to any one of 100 telephone destinations. Two years later he filed a patent for a 1,000-line automatic exchange.With the help of his nephew he made a 100line working demonstration and eventually, with the aid of financial backers, the Strowger Automatic Exchange Company was established on 30 October 1891; its first exchange was installed in La Porte, Indiana, in 1892. By the end of 1896 Strowger exchanges had been established in a number of other towns. That year the Strowger engineers introduced the dial system to replace the confusing push-button mechanism, an innovation that was to survive until relatively recently, and the following year saw development of a "trunking" system. In failing health, Strowger retired to Florida, but the company flourished and eventually became part of General Telephones and Electronics (GTE).[br]Principal Honours and DistinctionsStrowger's pioneering development was commemorated in 1949 by the telephone industry placing a bronze plaque on his grave in St Petersburg, Florida.Bibliography12 March 1889, US patent no. 447, 918.Further ReadingR.J.Chaphuis, 1982, 100 Years of Telephone Switching 1878–1978. Part I: Manual and Electromechanical Switching 1878–1960.KF -
20 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
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