| 单词 | point contact |
| 释义 | > as lemmaspoint contact point contact n. the state of touching at a point only; (Electronics) the contact of a metal point with the surface of a semiconductor so as to form a rectifying junction (frequently attributive). ΘΚΠ the world > matter > physics > solid state physics > semiconductivity > [noun] > contact with surface point contact1914 the world > space > distance > nearness > [noun] > contiguity > contact at one point point contact1914 1914 Proc. Physical Soc. 27 70 The present paper relates..to the conductivity of ‘point contacts’ when a steady, or slowly varying, E.M.F. is applied. 1945 R. K. Allan Rolling Bearings vi. 143 In roller bearings..we..have ‘line contact’ as distinct from the ‘point contact’ of ball bearings. 1947 C. F. Edwards in Proc. IRE 35 1181/2 It seems desirable to eliminate the terms ‘crystal’ and ‘crystal detector’ and designate these devices by the term ‘point-contact rectifier’. 1970 H. J. Watson Mod. Gear Production ii. 24 Crossed helical gears theoretically make point contact only which, under load sufficient to cause deflection of the contacting surfaces, becomes a line. 2004 K. Nakamura & T. Harayama Quantum Chaos & Quantum Dots ix. 166 As the point contacts are pinched off by using additional gates, the coupling becomes weaker. < as lemmas |
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