twin axis

twin axis

[′twin ′ak·səs]
(crystallography)
The crystal axis about which one individual of a twin crystal may be rotated (usually 180°) to bring it into coincidence with the other individual.
References in periodicals archive ?
Crystal growth is pronounced in the [100] direction (crystal elongation), less pronounced in [001] direction (crystal width), which coincides with the twin axis and least in the [010] direction (crystal thickness).
Available in 12 individual models per series, with angular measurement ranges from [+ or -]3[degrees] to [+ or -]90[degrees], and choices of single axis (SX41200) and twin axis (SX41400) versions, their design incorporates a galvanometric pendulum sensing element with hydromechanical damping, combined with an optical position sensor, with 4-20 mA or [+ or -]5 VDC ([+ or -]5 percent) output, proportional to sine of the angle of tilt.
The in-house designed robot features twin axis servo motion for consistent and reliable operation.
MONAG HAN will hope the twin axis of Tommy Freeman and Vincent Corey explodes into life at Brewster Park tomorrow afternoon.
An automatic twin axis transporter carries the work basket with a capacity of 400mm x 200mm x 200mm through the cleaning cycle.
That is, in Figure 9a, an octahedron face would be an equilateral triangle at the intersection of the three dodecahedron faces where the twin axis emerges.
To meet the above conditions, it is sufficient to show that faces of the form lie in the zone [111], i.e., are parallel to the twin axis. To show that a face (hkl) lies in the zone [uvw], the zonal equation
Symmetry considerations then show that, if one face of the form satisfies the above equation there will exist a belly band of six (or twelve) faces which lie in the zone of the twin axis. Forms of the hexoctahedral class of the isometric system have the symmetry 4/m 3 2/m,.
The 1-1 draw in Stockholm thanks to Kyle Lafferty's stunning equaliser was the least Nigel Worthington's team deserved for their committed performance, and one of the big pluses on the night was the success of the twin axis of Brunt and McCartney on the left-hand side.