| 单词 | thermionics |
| 释义 | > as lemmasthermiˈonics thermiˈonics n. (plural) the branch of science and technology concerned with thermionic emission. ΘΚΠ the world > matter > physics > electromagnetic radiation > electronics > [noun] > branches of thermionics1909 hi-fi1938 photoelectronics1940 radionics1943 optoelectronics1959 acoustoelectronics1968 optronics1968 ovonics1968 mechatronics1976 molecular electronics1983 biomechatronics1988 the world > matter > physics > electromagnetic radiation > electronics > electronic devices or components > thermionic valve > [noun] > study of thermionics1909 1909 O. W. Richardson in London, Edinb. & Dublin Philos. Mag. 6th Ser. 17 814 The author ventures to suggest that the word ‘Thermionics’..is very suitable for the purpose. 1933 E. L. Chaffee Theory of Thermionic Vacuum Tubes i. 8 Early experimenters in the field of thermionics believed that the emission of electricity from hot bodies..was the result of some sort of chemical reaction. 1940 Times 31 Aug. 7/4 New branches of knowledge like..photo-electricity, and thermionics sprang up out of the fertile soil. 1966 McGraw-Hill Encycl. Sci. & Technol. (rev. ed.) XII. 542a/1 In thermionics, power densities of 25 watt/cm2 at emitter temperatures of 1700°C have been obtained with hardware which is suitable for [space] flight. < as lemmas |
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