- spin axis point
- 转轴点
Atmospheric Sciences (English-Chinese) dictionary. 2014.
Atmospheric Sciences (English-Chinese) dictionary. 2014.
Spin (physics) — This article is about spin in quantum mechanics. For rotation in classical mechanics, see angular momentum. In quantum mechanics and particle physics, spin is a fundamental characteristic property of elementary particles, composite particles… … Wikipedia
Spin-flip — otheruses4|black hole spin flips|atomic spin flips|Hydrogen lineA black hole spin flip occurs when the spin axis of a rotating black hole undergoes a sudden change in orientation due to absorption of a second (smaller) black hole.Spin flips are… … Wikipedia
Spin wave — Spin waves are propagating disturbances in the ordering of magnetic materials. These low lying collective excitations occur in magnetic lattices with continuous symmetry. From the equivalent quasiparticle point of view, spin waves are known as… … Wikipedia
Point groups in three dimensions — In geometry, a point group in three dimensions is an isometry group in three dimensions that leaves the origin fixed, or correspondingly, an isometry group of a sphere. It is a subgroup of the orthogonal group O(3), the group of all isometries… … Wikipedia
Spin echo — In nuclear magnetic resonance, spin echo refers to the refocusing of precessing nuclear spin magnetisation by a 180° pulse of resonant radiofrequency.The NMR signal observed following an initial excitation pulse (orange in diagram) decays with… … Wikipedia
spin — I. verb (spun; spinning) Etymology: Middle English spinnen, from Old English spinnan; akin to Old High German spinnan to spin and perhaps to Lithuanian spęsti to set (a trap) Date: before 12th century intransitive verb 1. to draw out and twist… … New Collegiate Dictionary
spin — [[t]spɪ̱n[/t]] ♦♦♦ spins, spinning, spun 1) V ERG If something spins or if you spin it, it turns quickly around a central point. The latest discs, used for small portable computers, spin 3600 times a minute... The Earth spins on its own axis...… … English dictionary
Rotation around a fixed axis — Rotational motion can occur around more than one axis at once, and can involve phenomena such as wobbling and precession. Rotation around a fixed axis is a special case of rotational motion, which does not involve those phenomena. The kinematics… … Wikipedia
Neutron triple-axis spectrometry — Triple axis redirects here. For the concept in rocketry, see Three axis stabilisation. Science with Neutrons Foundations Neutron temperature … Wikipedia
Lagrangian point — The Lagrangian points (IPA en|ləˈgreɪndʒiən, IPA fr|lagʁɑ̃ʒjɑ̃; also Lagrange point, L point, or libration point), are the five positions in an orbital configuration where a small object affected only by gravity can theoretically be stationary… … Wikipedia
celestial mechanics — the branch of astronomy that deals with the application of the laws of dynamics and Newton s law of gravitation to the motions of heavenly bodies. [1815 25] * * * Branch of astronomy that deals with the mathematical theory of the motions of… … Universalium