screw axis

screw axis
Crystall.
a symmetry element of a space group such that a rotation of the lattice about the axis and a translation of the lattice some fraction of the lattice's unit distance brings the lattice back to its original position.
[1900-05]

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  • Screw axis — The screw axis (helical axis or twist axis) of an object is a parameter for describing simultaneous rotation and translation components of that object.The axis is a directed line in space, along which a translation may occur, and about which… …   Wikipedia

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  • screw axis — /ˈskru æksəs/ (say skrooh aksuhs) noun an axis of symmetry about which the atoms in a crystal lattice are arranged …  

  • screw axis — Crystall. a symmetry element of a space group such that a rotation of the lattice about the axis and a translation of the lattice some fraction of the lattice s unit distance brings the lattice back to its original position. [1900 05] …   Useful english dictionary

  • instantaneous screw axis — akimirkinė sraigtinė ašis statusas T sritis fizika atitikmenys: angl. instantaneous screw axis vok. momentane Schraubenachse, f rus. мгновенная винтовая ось, f pranc. axe hélicoïdal instantané, m …   Fizikos terminų žodynas

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  • Screw — (skr[udd]), n. [OE. scrue, OF. escroue, escroe, female screw, F. [ e]crou, L. scrobis a ditch, trench, in LL., the hole made by swine in rooting; cf. D. schroef a screw, G. schraube, Icel. skr[=u]fa.] 1. A cylinder, or a cylindrical perforation,… …   The Collaborative International Dictionary of English

  • Screw alley — Screw Screw (skr[udd]), n. [OE. scrue, OF. escroue, escroe, female screw, F. [ e]crou, L. scrobis a ditch, trench, in LL., the hole made by swine in rooting; cf. D. schroef a screw, G. schraube, Icel. skr[=u]fa.] 1. A cylinder, or a cylindrical… …   The Collaborative International Dictionary of English

  • Screw bean — Screw Screw (skr[udd]), n. [OE. scrue, OF. escroue, escroe, female screw, F. [ e]crou, L. scrobis a ditch, trench, in LL., the hole made by swine in rooting; cf. D. schroef a screw, G. schraube, Icel. skr[=u]fa.] 1. A cylinder, or a cylindrical… …   The Collaborative International Dictionary of English

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