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单词 rotator
释义

rotator


ro·ta·tor

R0314800 (rō′tā′tər)n.1. One that rotates.2. pl. ro·ta·tor·es (rō′tə-tôr′ēz) Anatomy A muscle that serves to rotate a part of the body.

rotator

(rəʊˈteɪtə) n1. a person, device, or part that rotates or causes rotation2. (Anatomy) anatomy any of various muscles that revolve a part on its axis

ro•ta•tor

(ˈroʊ teɪ tər; esp. Brit. roʊˈteɪ-)

n., pl. ro•ta•tors for 1,3, ro•ta•tor•es (ˌroʊ təˈtɔr iz, -ˈtoʊr-)
for 2. 1. a person or thing that rotates. 2. a muscle serving to rotate a part of the body. [1670–80; < Latin rotātor=rotā(re) (see rotate1) + -tor -tor]
Translations

Rotator


rotator

[′rō‚tād·ər] (anatomy) A muscle that partially rotates a part of the body on the part's axis. (electromagnetism) A device that rotates the plane of polarization of a plane-polarized electromagnetic wave, such as a twist in a waveguide. (mechanics) A rotating rigid body. (quantum mechanics) A molecule or other quantum-mechanical system which behaves as the quantum-mechanical analog of a rotating rigid body. Also known as top.

Rotator

 

a mechanical system consisting of a material point of mass μ held by a weightless fixed pivot at a constant distance r from a point O, which is fixed in space and constitutes the center of the rotator.

In classical mechanics, the permitted motion of the rotator is the rotation around the point O with a moment of inertia 7 = μr2. The motion of the rotator occurs in the plane perpendicular to the vector of the angular momentum M of the rotator. The energy of the rotator E = M2.

In quantum mechanics, the states of rotators are characterized by certain discrete values of the square of the orbital angular momentum Ml2 = ħ2l(l + 1) and of the projection of this momentum Mlz = mħ onto the quantization axis z ( ħ is Planck’s constant h divided by 2π), where the quantum number l of the orbital angular momentum can assume any nonnegative whole value 0, 1, 2, … and the magnetic quantum number m for a given l can assume any whole value between – l and +l. The permitted values of the energy of a rotator are E = ħ 2l(l + l)/27; that is, they do not depend on m. Thus, a (21 + l)-fold degeneration of levels occurs by values of the projection of the angular momentum.

The rotator is important as an idealized model used to describe the rotational motion of molecules and nuclei. In particular, the rotator model is used to describe the motion of diatomic molecules in which the distance between the atoms is a quantity that varies comparatively little. The energy states of the rotation of such a molecule as a whole (the rotational spectrum of the molecule) are described by the formula for the energy of a quantum rotator.

V. G. VAKS

rotator


ro·ta·tor mus·cle

1. one of the rotatores (muscles); 2. muscle that produces a rotation, alone or in concert with other rotators, around an axis, for example, rotator muscles of vertebral column. Synonym(s): musculus rotator [TA], rotator

ro·ta·to·res (mus·cles)

[TA] deepest of the three layers of transversospinalis muscles, chiefly developed in the thoracic region; they arise from the transverse process of one vertebra and are inserted into the root of the spinous process of the next two or three vertebrae above; action, traditionally described as a column, it is more likely that these muscles, provided with a very high density of muscle spindles, are organs of proprioception; nerve supply, dorsal primary rami of the spinal nerves. Synonym(s): musculi rotatores [TA]

rotator

(rō′tā′tər)n.1. One that rotates.2. pl. rotatores (rō′tə-tôr′ēz) Anatomy A muscle that serves to rotate a part of the body.

ro·ta·tor

(rō'tā-tŏr) A muscle by which a part can be turned circularly.
See also: rotation
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更新时间:2025/2/19 13:41:42