| 单词 | thermionic valve |
| 释义 | > as lemmasthermionic valve Of, pertaining to, or employing electrons emitted from an incandescent surface; thermionic valve, an electronic device consisting of an evacuated envelope containing two or more electrodes, such that a current can flow only in one direction as a result of thermionic emission from one electrode. ΘΚΠ the world > matter > physics > electromagnetic radiation > electronics > electronic devices or components > thermionic valve > [noun] tube1859 valve1905 thermionic valve1909 bottle1940 the world > matter > physics > electromagnetic radiation > electronics > electronic devices or components > thermionic valve > [adjective] thermionic1909 1909 O. W. Richardson in London, Edinb. & Dublin Philos. Mag. 6th Ser. 17 814 Here we have two currents: the current used to heat the wire and the thermionic current away from the surface of the latter. 1915 Electrician 21 May 241/1 The thermionic current..increased at first. 1917 Wireless World June 152 The invention by the writer [sc. J. A. Fleming] of this article of the thermionic detector. 1917 Wireless World June 158 Known by various titles, such as Fleming valve, vacuum valve,..thermionic valve, and audion valve, it is the result of experiments extending over a large number of years. 1920 Glasgow Herald 9 July 10 What with the high-frequency alternator, and..the thermionic valve, wireless practice has been very much revolutionised. 1928 Daily Express 13 Dec. 9 A thermionic reflexometer. 1933 Jrnl. Exper. Biol. 10 293 (heading) A thermionic potentiometer for measuring light intensity with photo-electric cells. 1956 G. A. Montgomerie Digital Calculating Machines xi. 216 By using thermionic valves and similar devices, the speed of automatic computors can be made very much higher. 1957 Times 26 Nov. 10/6 A new ‘thermionic converter’..takes advantage of the fact that electrons can be ‘boiled out’ of a hot metal surface and used to produce an electric current directly. 1975 D. G. Fink Electronics Engineers' Handbk. xxvii. 18 In a thermionic generator..electrons are emitted from the heated cathode..and collected by a cooler anode. < as lemmas |
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