spin-upn.

/ˈspɪnʌp/

Etymology: < spin v. + up adv.¹

An increase in the speed of rotation.

ΘΚΠ

the world > movement > motion in specific manner > revolution or rotation > [noun] > increase or decrease in speed of rotation

spin-up1960

spin-down1963

the world > movement > rate of motion > [noun] > increasing rate of movement or progress > of rotation

spin-up1960

1960 Jrnl. Geophysical Res. 65 2994 (caption) Increased stability of both the theoretical and observed motion is seen after spinup.

1968 New 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.

1969 Nature 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 New Scientist 26 Aug. 452/2 The favourite explanation that decreases in period, or ‘spin-ups’, occur when starquakes take place in the deformed crust of the star seems to fall flat on its face when confronted with the discovery that the Crab pulsar, at least, also undergoes ‘spin-downs’.

1977 Astron. & Astrophysics LX. 85/1 Subsequent retrograde spinup via thermally driven atmospheric tides can explain the present slow retrograde motion of the planet.

This entry has not yet been fully updated (first published 1986; most recently modified version published online June 2018).

spin-upadj.

/spɪˈnʌp/

Etymology: < spin n.¹ + up adv.²

Physics.

Being or pertaining to a particle with a spin pointing upwards.

ΘΚΠ

the world > matter > physics > quantum theory > electron spin > [adjective] > having upward spin

spin-up1965

1965 Sci. 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.

1970 Nature 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.

1973 McGraw-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.

1980 Rudden & 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.

This entry has not yet been fully updated (first published 1986; most recently modified version published online June 2018).

单词	spin-up
释义	spin-upn. /ˈspɪnʌp/ Etymology: < spin v. + up adv.¹ An increase in the speed of rotation. ΘΚΠ the world > movement > motion in specific manner > revolution or rotation > [noun] > increase or decrease in speed of rotation spin-up1960 spin-down1963 the world > movement > rate of motion > [noun] > increasing rate of movement or progress > of rotation spin-up1960 1960 Jrnl. Geophysical Res. 65 2994 (caption) Increased stability of both the theoretical and observed motion is seen after spinup. 1968 New 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. 1969 Nature 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 New Scientist 26 Aug. 452/2 The favourite explanation that decreases in period, or ‘spin-ups’, occur when starquakes take place in the deformed crust of the star seems to fall flat on its face when confronted with the discovery that the Crab pulsar, at least, also undergoes ‘spin-downs’. 1977 Astron. & Astrophysics LX. 85/1 Subsequent retrograde spinup via thermally driven atmospheric tides can explain the present slow retrograde motion of the planet. This entry has not yet been fully updated (first published 1986; most recently modified version published online June 2018). spin-upadj. /spɪˈnʌp/ Etymology: < spin n.¹ + up adv.² Physics. Being or pertaining to a particle with a spin pointing upwards. ΘΚΠ the world > matter > physics > quantum theory > electron spin > [adjective] > having upward spin spin-up1965 1965 Sci. 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. 1970 Nature 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. 1973 McGraw-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. 1980 Rudden & 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. This entry has not yet been fully updated (first published 1986; most recently modified version published online June 2018). < n.1960adj.1965
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