| 释义 |
▪ I. spin-up, n.|ˈspɪnʌp|
[f. spin v. + up adv.1]
An increase in the speed of rotation.
1960Jrnl. Geophysical Res. LXV. 2994 (caption) Increased stability of both the theoretical and observed motion is seen after spinup. 1968New Scientist 3 Oct. 8/2 The particular merit of the autogyro is that its rotor does not depend on engine power, except for the spin-up before take-off. 1969Nature 29 Nov. 873/1 The time scale for the cracking and initial spin up is of the order of 0·01 to 0·1 s, the time for a shear wave in the crust to propagate a stellar radius. 1971[see spin-down n.] 1977Astron. & Astrophysics LX. 85/1 Subsequent retrograde spinup via thermally driven atmospheric tides can explain the present slow retrograde motion of the planet.
▪ II. spin-up, a. Physics.|spɪˈnʌp|
[f. spin n.1 + up adv.2]
Being or pertaining to a particle with a spin pointing upwards.
1965Sci. Amer. Jan. 106/3 The electrons' magnetic field at the nucleus is produced by..the net spin density, or the ‘spin up’ density minus the ‘spin down’ density. 1970Nature 25 July 372/2 Four spin-up electrons at the corners of a tetrahedron and four spin-down electrons at the corners of an interpenetrating tetrahedron pointing the opposite way are arranged around each oxygen centre. 1973McGraw-Hill Yearbk. Sci. & Technol. 287/1 With this technique, it is possible to calculate the difference between the spin-up and the spin-down populations in each electron shell. 1980Rudden & Wilson Elem. Solid State Physics ii. 41 The first available electron is placed in the is spin-up state, the second in the is spin-down state. |