| 释义 |
deˈcouple, v.
[a. F. découple-r to uncouple: see de- I. 6.]
†1. To uncouple. Obs. rare—1.
16022nd Pt. Return fr. Parnass. ii. v. (Arb.) 32 Another company of houndes..had their couples cast off and we might heare the Huntsmen cry, horse, decouple, Auant.
2. a. To make the coupling between (two oscillatory systems, or two modes of oscillation of a single system) very loose, so that there is little transfer of oscillations from one to the other; chiefly Electr. So deˈcoupling vbl. n.
1931Wireless World 19 Aug. 175/2 A large-capacity paper type condenser may have a higher internal impedance..and so give less effective de-coupling. 1938Wireless Engineer. Sept. 480 The time constants of the series and parallel type of filter, used for decoupling the A.V.C. bias from the grid circuit of the R.F. controlled valves, are examined. 1940Amateur Radio Handbk. (ed. 2) 86/2 In some cases it is necessary to use decouplings which are effective for R.F. but which allow currents of speech frequency to pass. 1961Harris & Crede Shock & Vibration Handbk. II. xxx. 27 The natural modes of vibration of a body supported by isolators may be decoupled one from another by proper orientation of the isolators. Each mode of vibration then exists independently of the others. 1962Simpson & Richards Junction Transistors xv. 370 A collector decoupling filter, in which a resistor of value R is placed between the collector bias resistor and the power supply. 1964R. F. Ficchi Electrical Interference x. 187 Another technique that is useful for decoupling power supply leads is the decoupling capacitor.
b. To muffle the sound or shock of (a nuclear explosion) by causing it to take place in an underground cavity.
1960Guardian 15 June 1/2 He wanted to know whether ‘de-coupling’ (the way of muffling underground tests) was to be tested. 1960New Scientist 24 Nov. 1369/1 There have been claims in the United States that an explosion conducted in a large spherical cavity is greatly muffled, or ‘decoupled’. 1966Ibid. 28 July 191/3 The decoupling effects of a nuclear explosion in a large sphere..are a mystery.
Add:3. intr. Physics and Astron. To stop being coupled; to stop participating in interactions that maintain thermal equilibrium; spec. (of particles and fields) to become differentiated from or into, or into two or more kinds of entity.
1966Physical Rev. CXLVIII. 1348/1 The multichannel problem at the poles decouples into a series of single-channel problems. 1971Physics Bull. Sept. 518/1 Some authors have even revived the possible connection of the pomeron and the f°, in particular noting that both decouple (to a good approximation) from the s channel helicity flip amplitude. 1977M. Rowan-Robinson Cosmol. v. 90, T 12 K : muons annihilate; neutrinos and antineutrinos decouple from everything else. 1978Nature 27 Apr. 787/3 Only muon neutrinos and antineutrinos decouple at 1012 K, whereas electron neutrinos and antineutrinos decouple at 1010 K. 1981J. Ellis in J. M. Mulvey Nature of Matter vi. 129 As the Universe expanded and cooled radiation and matter would eventually have decoupled. 1987Sci. Amer. July 36/3 Matter began to decouple from radiation and the universe became transparent.
4. trans. More generally: to make separate or independent (from); to dissociate, disengage.
1971I. G. Gass et al. Understanding Earth xix. 270/1 The plates are of finite thickness and..at some depth they become decoupled from what lies beneath. 1976Forbes (N.Y.) 15 Jan. 53/3 He thinks lawmakers might simply ‘decouple’ benefits. That is, make future benefits depend upon wage increases or price increases, but not on both. 1979Dædalus Spring p. ix, Europeans have gradually decoupled their ideologies and values from those of the Third World. 1984Times 6 Aug. 11/4 If we want to bring interest rates down we have to decouple the pound from the dollar. 1985N.Y. Times Mag. 20 Jan. 11/1 There's not the slightest possibility that America would be decoupled from Europe by the pursuit of this vital initiative. |