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1 musical arc
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2 musical arc
Электроника: поющая дуга -
3 arc
m1) дуга, дуговой разряд2) арка; арочная ферма; арочная перемычка; свод3) мат. дуга (см. тж. arcs 2))•- arc à basse tension
- arc calme
- arc en chaînette
- arc chantant
- arc au charbon
- arc de cercle
- arc circumhorizontal
- arc circumzénital
- arc de commutation
- arc de contact
- arc de contacts
- arc continu
- arc cosinus
- arc cotangente
- arc à courant continu
- arc de court-circuit
- arc crépusculaire
- arc de la décharge
- arc diurne
- arc droit
- arc à effet de champ
- arc électrique
- arc électrique alternatif
- arc embrassé
- arc à émission électrostatique
- arc encastré
- arc d'engrènement
- arc de fermeture
- arc à flamme
- arc à forte pénétration
- arc gradué
- arc à grande intensité
- arc à haute tension
- arc d'interruption
- arc isostatique
- arc libre
- arc marchant
- arc à métal
- arc métallique
- arc à miroir
- arc moyennement pénétrant
- arc musical
- arc noyé
- arc nu
- arc pilote
- arc à plasma
- arc de pression
- arc puisant
- arc de référence
- arc de renforcement
- arc en retour
- arc de rupture
- arc sifflant
- arc silencieux
- arc sinus
- arc à souder
- arc de soutènement
- arc tangente
- arc à la température élevée
- arc thermique
- arc thermo-ionique
- arc dans le vide
- arc voltaïque
- arc de voûte
- arc voyageant -
4 arc
1. дуга2. дуговая лампа -
5 arc
дуга; дуговой разряд -
6 arc musical
"поющая" электрическая дуга -
7 arc musical
сущ.тех. "поющая" электрическая дуга -
8 electric arc
1. вольтова дуга2. дуговой разрядThe English-Russian dictionary general scientific > electric arc
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9 carbon arc
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10 circular arc
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11 submerged arc
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12 sustained arc
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13 welding arc
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14 white-flame arc
English-Russian big polytechnic dictionary > white-flame arc
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15 gas-shielded arc
English-Russian dictionary on nuclear energy > gas-shielded arc
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16 strike an arc
English-Russian dictionary on nuclear energy > strike an arc
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17 voltaic arc
The English-Russian dictionary general scientific > voltaic arc
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18 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 -
19 поющая дуга
1) Engineering: duddle arc, sounding electric arc2) Electronics: musical arc, singing arc, singing electric arc -
20 поющая электрическая дуга
adjeng. arc chantant, arc musicalDictionnaire russe-français universel > поющая электрическая дуга
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См. также в других словарях:
musical — musical, ale, aux [ myzikal, o ] adj. • 1380; de musique 1 ♦ Qui est propre, appartient à la musique. Son musical. Notation musicale. « Swann tenait les motifs musicaux pour de véritables idées » (Proust). ♢ Où il y a de la musique; qui concerne… … Encyclopédie Universelle
Arc converter — The arc converter, sometimes called the arc transmitter or Poulsen arc after its inventor Valdemar Poulsen, is a device used to convert DC energy into RF energy. It is now on the list of IEEE Milestones as a historic achievement in electrical… … Wikipedia
arc-en-terre — ⇒ARC EN TERRE, subst. masc. Plur. des arcs en terre. A. MUS. Instrument archaïque proche de l arc musical, se composant ,,d une tige flexible plantée dans le sol et d une corde tendue verticalement d un point de celle ci à une plaque d écorce… … Encyclopédie Universelle
ARC — Cette page d’homonymie répertorie les différents sujets et articles partageant un même nom. {{{image}}} Sigles d une seule lettre Sigles de deux lettres > Sigles de trois lettres … Wikipédia en Français
Arc (álbum) — Saltar a navegación, búsqueda Arc Álbum en directo de Neil Young Crazy Horse Publicación 1991 Grabación 1991 … Wikipedia Español
Arc musical — ● Arc musical instrument composé d une corde tendue entre les deux extrémités d une branche courbée. (Le son produit est amplifié par la cavité buccale du musicien.) … Encyclopédie Universelle
arc — 1. arc [ ark ] n. m. • 1080; lat. arcus 1 ♦ Arme formée d une tige souple (de bois, de métal) que l on courbe au moyen d une corde attachée aux deux extrémités pour lancer des flèches. Arc et arbalète. Bander, tendre l arc. Tirer des flèches avec … Encyclopédie Universelle
musical sound — Introduction any tone with characteristics such as controlled pitch and timbre. The sounds are produced by instruments in which the periodic vibrations can be controlled by the performer. That some sounds are intrinsically musical,… … Universalium
Arc musical — L’arc musical est un instrument de musique idiocorde primitif et ancien (des peintures rupestres attestent son existence en France il y a 15 000 ans). Comme son nom l indique, il est dérivé de l arc en tant qu arme de guerre. La différence… … Wikipédia en Français
Musical fountain — A musical fountain is a type of animated fountain for entertainment purposes that creates an aesthetic design (including three dimensional images). This is achieved by employing the effects of timed sound waves and timed light (including laser)… … Wikipedia
Arc — Cette page d’homonymie répertorie les différents sujets et articles partageant un même nom. Sigles d’une seule lettre Sigles de deux lettres > Sigles de trois lettres Sigles de quatre lettres … Wikipédia en Français
