spin-downn.

/ˈspɪndaʊn/

Etymology: < spin v. + down adv.

A decrease in the speed of rotation of something.

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] > decreasing rate of movement or progress > of rotation

spin-down1963

1963 Jrnl. Fluid Mechanics 117 402 The initial angular velocity Ω₀ = 3·668 sec^—1, and the final angular velocity Ω₁ = 3·033 sec^—1. (This was a case of ‘spin-down’.)

1967 Astrophysical Jrnl.: Lett. 149 l121 The ‘spin-down’ time of a cup of tea is approximately (R²/vΩ)½, where R is the radius of the cup and Ω is the angular velocity of the tea.

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 Braking by tidal torques and possibly magnetospheric friction can account for a spin-down of Venus within some 10⁹ years.

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

spin-downadj.

/spɪnˈdaʊn/

Etymology: < spin n.¹ + down adj.

Physics.

Being or pertaining to a particle whose spin points downwards.

ΘΚΠ

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

spin-down1965

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.

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

单词	spin-down
释义	spin-downn. /ˈspɪndaʊn/ Etymology: < spin v. + down adv. A decrease in the speed of rotation of something. 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] > decreasing rate of movement or progress > of rotation spin-down1963 1963 Jrnl. Fluid Mechanics 117 402 The initial angular velocity Ω₀ = 3·668 sec^—1, and the final angular velocity Ω₁ = 3·033 sec^—1. (This was a case of ‘spin-down’.) 1967 Astrophysical Jrnl.: Lett. 149 l121 The ‘spin-down’ time of a cup of tea is approximately (R²/vΩ)½, where R is the radius of the cup and Ω is the angular velocity of the tea. 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 Braking by tidal torques and possibly magnetospheric friction can account for a spin-down of Venus within some 10⁹ years. This entry has not yet been fully updated (first published 1986; most recently modified version published online March 2018). spin-downadj. /spɪnˈdaʊn/ Etymology: < spin n.¹ + down adj. Physics. Being or pertaining to a particle whose spin points downwards. ΘΚΠ the world > matter > physics > quantum theory > electron spin > [adjective] > having downward spin spin-down1965 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. This entry has not yet been fully updated (first published 1986; most recently modified version published online March 2018). < n.1963adj.1965
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