| 释义 |
▪ I. ket1 Obs. exc. dial.
Also 6 kytte.
[a. ON. kjǫt (:—*ketwom), flesh, in mod.Icel. also ket (Sw. kött, Da. kød, kjød).]
Raw flesh; carrion; also fig. trash, rubbish.
c1220Bestiary 438 He billeð one ðe foxes fel, Wo so telleð idel spel, And he tireð on his ket Wo so him wið sinne fet [= feeds]. 1586Scotter Manor Records in N.W. Linc. Gloss., That no man throwe no kytte or caryon vnto the heighe waye. 1616Surfl. & Markh. Country Farme 677 Your raw flesh meate (which amongst huntsmen is called ket). 1788W. Marshall Yorksh. Gloss. (E.D.S.), Ket, carrion. 1808–80Jamieson, Ket, kett, carrion, the flesh of animals, especially sheep, that have died of disease or from accident. 1893Northumbld. Gloss., Ket.
Comb.1828Craven Dial., Ket-craw, a carrion crow.
▪ II. ket2 Sc. rare—1.
[cf. cot n.2]
‘A matted, hairy fleece of wool’ (Jam.).
1782Burns Poor Mailie's Elegy vi, She was nae get o' moorland tips, Wi' tawted ket, an' hairy hips.
▪ III. ket3 Quantum Mech.|kɛt|
[f. bracket: cf. bra2.]
A vector in Hilbert space symbolized by {vb}>; esp. one representing the state of a quantized system. Freq. as ket vector.
1947P. A. M. Dirac Princ. Quantum Mech. (ed. 3) i. 16 It is desirable to have a special name for describing the vectors which are connected with the states of a system in quantum mechanics, whether they are in a space of a finite or an infinite number of dimensions. We shall call them ket vectors, or simply kets, and denote a general one of them by a special symbol {vb}>. 1957F. Mandl Quantum Mech. (ed. 2) v. 102 Labels, in particular eigenvalues, distinguishing different ket vectors are written as arguments of the ket vectors. For example, we might write a set of vectors as {vb}1>, {vb}2>,..{vb}n>, or the wave function (14.4) as {vb}l, m>. 1972J. M. Jauch in Salam & Wigner Aspects Quantum Theory ix. 142 Dirac never defines what a ket vector is mathematically, he describes its physical interpretation as ‘vectors which are connected with the states of a system in quantum mechanics’. From the context one concludes that they are vectors in a Hilbert space. 1973[see bra2]. 1974P. W. Atkins Quanta 30 The state of a system whose wavefunction is Ψn(r) is represented by the ket {vb}n>, and the conjugate Ψn*(r) by the bra ‹n{vb}. |