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1 very high-frequency generator
Техника: генератор ОВЧ диапазонаУниверсальный англо-русский словарь > very high-frequency generator
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2 very high-frequency generator
Engineering: VHFGУниверсальный русско-английский словарь > very high-frequency generator
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3 high
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4 VHFG
very high-frequency generator - генератор ОВЧ диапазона -
5 генератор ОВЧ диапазона
Engineering: very high-frequency generator, very high-frequency oscillatorУниверсальный русско-английский словарь > генератор ОВЧ диапазона
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6 VHFG
Техника: very high-frequency generator -
7 VHF
1 abbr (very high frequency)2 -
8 Poulsen, Valdemar
[br]b. 23 November 1869 Copenhagen, Denmarkd. 23 July 1942 Gentofte, Denmark[br]Danish engineer who developed practical magnetic recording and the arc generator for continuous radio waves.[br]From an early age he was absorbed by phenomena of physics to the exclusion of all other subjects, including mathematics. When choosing his subjects for the final three years in Borgedydskolen in Christianshavn (Copenhagen) before university, he opted for languages and history. At the University of Copenhagen he embarked on the study of medicine in 1889, but broke it off and was apprenticed to the machine firm of A/S Frichs Eftf. in Aarhus. He was employed between 1893 and 1899 as a mechanic and assistant in the laboratory of the Copenhagen Telephone Company KTAS. Eventually he advanced to be Head of the line fault department. This suited his desire for experiment and measurement perfectly. After the invention of the telegraphone in 1898, he left the laboratory and with responsible business people he created Aktieselskabet Telegrafonen, Patent Poulsen in order to develop it further, together with Peder Oluf Pedersen (1874– 1941). Pedersen brought with him the mathematical background which eventually led to his professorship in electronic engineering in 1922.The telegraphone was the basis for multinational industrial endeavours after it was demonstrated at the 1900 World's Exhibition in Paris. It must be said that its strength was also its weakness, because the telegraphone was unique in bringing sound recording and reproduction to the telephone field, but the lack of electronic amplifiers delayed its use outside this and the dictation fields (where headphones could be used) until the 1920s. However, commercial interest was great enough to provoke a number of court cases concerning patent infringement, in which Poulsen frequently figured as a witness.In 1903–4 Poulsen and Pedersen developed the arc generator for continuous radio waves which was used worldwide for radio transmitters in competition with Marconi's spark-generating system. The inspiration for this work came from the research by William Duddell on the musical arc. Whereas Duddell had proposed the use of the oscillations generated in his electric arc for telegraphy in his 1901 UK patent, Poulsen contributed a chamber of hydrogen and a transverse magnetic field which increased the efficiency remarkably. He filed patent applications on these constructions from 1902 and the first publication in a scientific forum took place at the International Electrical Congress in St Louis, Missouri, in 1904.In order to use continuous waves efficiently (the high frequency constituted a carrier), Poulsen developed both a modulator for telegraphy and a detector for the carrier wave. The modulator was such that even the more primitive spark-communication receivers could be used. Later Poulsen and Pedersen developed frequency-shift keying.The Amalgamated Radio-Telegraph Company Ltd was launched in London in 1906, combining the developments of Poulsen and those of De Forest Wireless Telegraph Syndicate. Poulsen contributed his English and American patents. When this company was liquidated in 1908, its assets were taken over by Det Kontinentale Syndikat for Poulsen Radio Telegrafi, A/S in Copenhagen (liquidated 1930–1). Some of the patents had been sold to C.Lorenz AG in Berlin, which was very active.The arc transmitting system was in use worldwide from about 1910 to 1925, and the power increased from 12 kW to 1,000 kW. In 1921 an exceptional transmitter rated at 1,800 kW was erected on Java for communications with the Netherlands. More than one thousand installations had been in use worldwide. The competing systems were initially spark transmitters (Marconi) and later rotary converters ( Westinghouse). Similar power was available from valve transmitters only much later.From c. 1912 Poulsen did not contribute actively to further development. He led a life as a well-respected engineer and scientist and served on several committees. He had his private laboratory and made experiments in the composition of matter and certain resonance phenomena; however, nothing was published. It has recently been suggested that Poulsen could not have been unaware of Oberlin Smith's work and publication in 1888, but his extreme honesty in technical matters indicates that his development was indeed independent. In the case of the arc generator, Poulsen was always extremely frank about the inspiration he gained from earlier developers' work.[br]Bibliography1899, British patent no. 8,961 (the first British telegraphone patent). 1903, British patent no. 15,599 (the first British arc-genera tor patent).His scientific publications are few, but fundamental accounts of his contribution are: 1900, "Das Telegraphon", Ann. d. Physik 3:754–60; 1904, "System for producing continuous oscillations", Trans. Int. El. Congr. St. Louis, Vol. II, pp. 963–71.Further ReadingA.Larsen, 1950, Telegrafonen og den Traadløse, Ingeniørvidenskabelige Skrifter no. 2, Copenhagen (provides a very complete, although somewhat confusing, account of Poulsen's contributions; a list of his patents is given on pp. 285–93).F.K.Engel, 1990, Documents on the Invention of Magnetic Re cor ding in 1878, New York: Audio Engineering Society, reprint no. 2,914 (G2) (it is here that doubt is expressed about whether Poulsen's ideas were developed independently).GB-N -
9 circuit
2) канал3) т. граф. простая цепь, контур•- active circuit
- acyclic circuit
- adding circuit
- add circuit
- addressing circuit
- advancing circuit
- alarm circuit
- amplifying circuit
- analogous circuit
- analog circuit
- AND-to-OR circuit
- antialiasing circuit
- anticoincidence circuit
- antihunting circuit
- antihunt circuit
- aperiodic circuit
- arithmetic circuit
- arithmetical circuit
- astable circuit
- averaging circuit
- balanced circuit
- basis circuit
- beam-lead integrated circuit
- benchmark circuit
- binary-valued digital circuit
- binary-valued circuit
- bipolar circuit
- bistable circuit
- blanking circuit
- bleeder circuit
- bridge circuit
- buffer circuit
- carry circuit
- character selection circuit
- checking circuit
- check circuit
- clamping circuit
- clocked circuit
- clock-recovery circuit
- closed circuit
- code disjoint circuit
- coincidence circuit
- combinational circuit
- combinatorial circuit
- communication circuit
- comparator circuit
- compare circuit
- comparison circuit
- complementary circuit
- complementary integrated circuit
- complementary transistor logic circuit
- complex function circuit
- computer circuit
- computer test circuit
- computing circuit
- control circuit
- core-diode circuit
- core-transistor circuit
- correcting circuit
- correction circuit
- counter circuit
- counting circuit
- coupling circuit
- current-limit circuit
- current-operated circuit
- current-summation circuit
- custom product integrated circuit
- custom integrated circuit
- custom-wired integrated circuit
- cutoff circuit
- cycle circuit
- cyclic circuit
- dead-on-arrival integrated circuit
- decode circuit
- decoding circuit
- deenergizing circuit
- deflection circuit
- delay circuit
- densely packed circuit
- differentiating circuit
- digital computing circuit
- diode circuit
- diode-coupled circuit
- diode-transistor logic circuit
- direct-coupled circuit
- direct-coupled transistor logic circuit
- direct-current circuit
- discrete component circuit
- discrete logic-level
- discrete wired circuit
- display circuit
- divide-by-two circuit
- dividing circuit
- double-sided printed circuit
- doubling circuit
- drive circuit
- dry circuit
- dual circuit
- duplex circuit
- Eccles-Jordan circuit
- edge-activated circuit
- emitter-coupled circuit
- emitter-coupled logic circuit
- emitter-emitter-coupled logic circuit
- equality circuit
- equivalent circuit
- etched circuit
- Euler circuit
- except circuit
- fanout-free circuit
- fast-switching circuit
- fault detection circuit
- fault-free circuit
- fault-secure circuit
- faulty circuit
- feedback circuit
- ferrite-diode circuit
- ferrite-transistor circuit
- ferroresonant computing circuit
- film integrated circuit
- flag-testing circuit
- flat-pack integrated circuit
- flexible printed circuit
- flexible circuit
- flip-chip integrated circuit
- flip-flop circuit
- frame-grounding circuit
- frequency-halving circuit
- function circuit
- gate circuit
- Goto-pair circuit
- half-duplex circuit
- halving circuit
- Hamilton circuit
- hand-designed circuit
- hardwired circuit
- high-speed circuit
- high-threshold logic circuit
- holding circuit
- hybrid circuit
- idler circuit
- imbedded circuit
- IMOS circuit
- impulse circuit
- inhibit circuit
- input circuit
- integrated circuit
- integrating circuit
- integro-differential circuit
- interchange circuit
- interface circuit
- interfacing circuit
- interlock circuit
- invert circuit
- ion-implanted MOS circuit
- irredundant circuit
- Josephson integrated circuit
- junction transistor circuit
- ladder circuit
- lag-lead circuit
- laminar circuit
- large arithmetic circuit
- large-scale integrated circuit
- large-scale integration circuit
- latch circuit
- lead-lag circuit
- leased circuit
- level circuit
- linear circuit
- linear integrated circuit
- linearity circuit
- liquid logic circuit
- load circuit
- locked pair circuit
- locking circuit
- logic circuit
- logical circuit
- low-threshold integrated circuit
- LSI circuit
- lumped circuit
- magnetic circuit
- magnetic-core circuit
- majority circuit
- match circuit
- material equivalence circuit
- matrix circuit
- maximum-remembering circuit
- measuring circuit
- medium-scale integration circuit
- memory circuit
- memory-decoder circuit
- message circuit
- metal-oxide-semiconductor circuit
- microamp circuit
- microelectronic integrated circuit
- microminiature circuit
- microwave circuit
- mil spec integrated circuit
- milliwatt circuit
- miniature circuit
- minimum-remembering circuit
- mixed-level circuit
- mixing circuit
- modularized circuit
- molecular integrated circuit
- monitoring circuit
- monolithic integrated circuit
- monostable circuit
- MOS circuit
- MOS integrated circuit
- MOS LSI circuit
- MSI circuit
- multichip integrated circuit
- multifunction integrated circuit
- multilayer circuit
- multilevel circuit
- multiple output circuit
- multiplying circuit
- multipoint circuit
- multistable circuit
- multistage circuit
- nanosecond circuit
- n-channel circuit
- network circuit
- noise-balancing circuit
- noncoincidence circuit
- noncutoff circuit
- non-self-checking circuit
- one-core-per-bit circuit
- one-generator equivalent circuit
- one-out-of-four selecting circuit
- one-shot circuit
- open circuit
- optical commutation circuit
- optical memory circuit
- optically coupled circuit
- optoelectronic circuit
- output circuit
- packaged circuit
- packed circuit
- p-channel circuit
- phantom circuit
- phase-comparison circuit
- phase-inverting circuit
- picosecond circuit
- pilot circuit
- plastic-embedded circuit
- point-to-point circuit
- power circuit
- power monitoring circuit
- power-fail circuit
- printed circuit
- priority circuit
- propagation circuit
- protection circuit
- pulse circuit
- pulse-actuated circuit
- pulse-broadening circuit
- pulse-regenerating circuit
- pulse-shaping circuit
- pulse-stretching circuit
- pulse-switching circuit
- pumped tunnel-diode transistor logic circuit
- pumping circuit
- quenching circuit
- race-free circuit
- radio-frequency circuit
- random-logic circuit
- ratioed circuit
- reading circuit
- received-data circuit
- receiving circuit
- reconfigurable integrated circuit
- redundant circuit
- reference circuit
- refreshing circuit
- relaxation circuit
- reset circuit
- retriggerable circuit
- rewriting circuit
- ring circuit
- rounding circuit
- sample-hold circuit
- saturated circuit
- scale-of-N circuit
- scale-of-two circuit
- scaling circuit
- schematic circuit
- Schmitt trigger circuit
- Schmitt circuit
- screen printed circuit
- selection circuit
- select circuit
- self-checking circuit
- self-testing circuit
- self-timed circuit
- semiconductor circuit
- send-request circuit
- sequential circuit
- shifting circuit
- shift circuit
- short circuit
- shunt-peaking circuit
- sign-controlled circuit
- silicon integrated circuit
- silicon-on-sapphire integrated circuit
- simplex circuit
- single-chip circuit
- single-ended circuit
- single-level circuit
- single-phase circuit
- single-shot circuit
- small-scale integration circuit
- solid-state circuit
- solid circuit
- SOS integrated circuit
- squaring circuit
- SSI circuit
- stabilizing circuit
- stamped circuit
- start-stop circuit
- steering circuit
- storage circuit
- storage-selection circuit
- strongly fault-secure circuit
- subtraction circuit
- summing circuit
- sweep circuit
- switching circuit
- symbolic circuit
- synchronizing circuit
- synthesis circuit
- thick-film circuit
- thin-film circuit
- threshold circuit
- time-anticoincidence circuit
- time-base circuit
- time-coincidence circuit
- time-delay circuit
- toll circuit
- totally self-checking circuit
- transistor circuit
- transistor-core circuit
- transistor-resistor circuit
- transistor-transistor-logic circuit
- translation circuit
- transmitted-data circuit
- transmitting circuit
- tree circuit
- trigger -action circuit
- trigger circuit
- trunk circuit
- tunnel diode circuit
- twin-tunnel-diode circuit
- twin circuit
- two-cores-per-bit circuit
- two-input circuit
- two-level circuit
- two-way circuit
- ultra-large-scale integration circuit
- unidirectional circuit
- unpackaged circuit
- unpacked circuit
- very-high-speed integrated circuit
- very-large-scale integration circuit
- virtual circuit
- VLSI circuit
- voice circuit
- voice-grade circuit
- voltage-control circuit
- voltage-doubling circuit
- voltage-multiplying circuit
- voltage-summation circuit
- voter circuit
- wave-shaping circuit
- whole-wafer circuit
- wired AND circuit
- wired OR circuit
- wire-wrapped circuit
- writing circuit
- zero circuitEnglish-Russian dictionary of computer science and programming > circuit
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10 instability
•- amplifier instability
- amplitude instability
- ballooning instability
- beam instability
- Benjamen-Feir instability
- bremsstrahlung instability
- built-in instability
- capillary instability
- cone instability
- convective instability
- corkscrew instability
- cyclotron instability
- decay instability
- drift instability
- dynamic instability
- elastic instability
- elastically pumped instability
- electric instability
- electrohydrodynamic instability
- electrojet instability
- electron-sound instability
- electrostatic instability
- electrothermal instability
- explosive instability
- firehose instability
- flute instability
- frequency instability
- generator instability
- global instability
- gravitational instability
- Gunn instability
- helical instability
- high-power instability
- hydromagnetic instability
- image instability
- ion-sound instability
- kinetic instability
- lateral instability
- lattice instability
- long-term instability
- loop instability
- magnetic instability
- magnetoacoustic instability
- magnetoelastic-wave instability
- mode instability
- modulation instability
- negative bias instability
- oscillator instability
- parallel pumped instability
- parametric instability
- phase instability
- pinch instability
- plasma instability
- resistive instability
- screw instability
- self-field instability
- short-term instability
- spin-wave instability
- static instability
- stochastic instability
- stream instability
- streaming instability
- structural instability
- surface-state instability
- tearing instability
- tearing-mode instability
- thermal instability
- timing instability
- transit-time instability
- transversely pumped instability
- trapped-particle instability
- two-beam instability
- two-stream instability
- very-short-term instability
- wriggle instability -
11 instability
•- amplifier instability
- amplitude instability
- ballooning instability
- beam instability
- Benjamen-Feir instability
- bremsstrahlung instability
- built-in instability
- capillary instability
- cone instability
- convective instability
- corkscrew instability
- cyclotron instability
- decay instability
- drift instability
- dynamic instability
- elastic instability
- elastically pumped instability
- electric instability
- electrohydrodynamic instability
- electrojet instability
- electron-sound instability
- electrostatic instability
- electrothermal instability
- explosive instability
- firehose instability
- flute instability
- frequency instability
- generator instability
- global instability
- gravitational instability
- Gunn instability
- helical instability
- high-power instability
- hydromagnetic instability
- image instability
- ion-sound instability
- kinetic instability
- lateral instability
- lattice instability
- long-term instability
- loop instability
- magnetic instability
- magnetoacoustic instability
- magnetoelastic-wave instability
- mode instability
- modulation instability
- negative bias instability
- oscillator instability
- parallel pumped instability
- parametric instability
- phase instability
- pinch instability
- plasma instability
- resistive instability
- screw instability
- self-field instability
- short-term instability
- spin-wave instability
- static instability
- stochastic instability
- stream instability
- streaming instability
- structural instability
- surface-state instability
- tearing instability
- tearing-mode instability
- thermal instability
- timing instability
- transit-time instability
- transversely pumped instability
- trapped-particle instability
- two-beam instability
- two-stream instability
- very-short-term instability
- wriggle instabilityThe New English-Russian Dictionary of Radio-electronics > instability
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