| 单词 | screw axis |
| 释义 | > as lemmasscrew axis screw axis n. (a) the longitudinal axis of a screw; (b) Mathematics the longitudinal axis of a helix; an axis of symmetry such that a combination of rotation about it and translation along it constitutes a symmetry operation, but neither does so alone. ΘΚΠ the world > matter > chemistry > crystallography (general) > crystal (general) > crystal symmetry > [noun] > axis of symmetry > types of screw axis1843 twin-axis1855 triad axis1909 1843 Mechanics' Mag. 7 Jan. 5/1 The power is applied direct to the crank on the screw axis. 1885 B. Williamson & F. A. Tarleton Elem. Treat. Dynamics x. 309 Let O be this point, and O' the point in which the shortest distance between the consecutive positions of the instantaneous screw-axis meets the consecutive screw-axis. 1903 H. Hilton Math. Crystallogr. xvi. 146 The combination of a rotation about an axis and a translation parallel to it is called a screw about that axis; and if such a combination brings a figure U to self-coincidence the axis is called a screw-axis of symmetry for U. 1997 Pop. Mech. Oct. 83/3 The jaw assembly pivots a complete 360° on the screw axis. 2008 M. El-Batanouny & F. Wooten Symmetry & Condensed Matter Physics x. 303 A translation..that is parallel to a glide plane or parallel to a screw axis, combined with a point-group operation, are the fundamental operations admitted in crystallography. < as lemmas |
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