- 行业: Mining
- Number of terms: 33118
- Number of blossaries: 0
- Company Profile:
The U.S. Bureau of Mines (USBM) was the primary United States Government agency conducting scientific research and disseminating information on the extraction, processing, use, and conservation of mineral resources.
Founded on May 16, 1910, through the Organic Act (Public Law 179), USBM's missions ...
Twinning by which a crystal simulates the symmetry of a crystal class with higher grade in the same system.
Industry:Mining
Twinning produced subsequent to the original formation of a crystal.
Industry:Mining
Two belt conveyors whose conveying surfaces combine to convey loads up steep inclines or vertically.
Industry:Mining
Two borides are known: ThB<sub>4</sub>(gray) and ThB<sub>6</sub>(deep red). More attention has been paid to the tetraboride, the properties of which are melting point, >2,200 degrees C (but oxidizes slowly above 1,000 degrees C); thermal expansion, 5.9X10<sub>-6</sub>(20 to 1,000 degrees C); sp gr, 8.45 g/mL; modulus of rupture (20 degrees C), 20,000 psi (138 MPa) . Some properties of ThB<sub>6</sub>are melting point, 2,200 degrees C; sp gr, 7.1.
Industry:Mining
Two carbides are known: ThC, melting point, 2,625 degrees C; ThC<sub>2</sub>, melting point, 2,655 degrees C. These special carbides are of potential interest in nuclear engineering.
Industry:Mining
Two chemically dissimilar metals in mutual electrical contact. The friction produced by the mechanical agitation of the two members of the couple results in the flow of an electric current. The power of a tribocouple is the magnitude of the current that it will generate under specified conditions of friction.
Industry:Mining
Two compressors, side by side, and made in the combination of simple steam and simple air cylinder, simple steam and compound air cylinders, or compound steam and compound air cylinders.
Industry:Mining
Two conductors of different metals joined together at both ends, producing a loop in which an electric current will flow when there is a difference in temperature between the two junctions. Abbrev., tc.
Industry:Mining
Two endless chains or other linkage between which carriers are mounted and controlled, so that the carriers remain in an upright and horizontal position throughout the complete cycle of the conveyor.
Industry:Mining
Two flanged hubs, one equipped with rubber-bushed holes, the other equipped with pins that mesh with the rubber bushings. To prevent excessive wear, the rubber bushings are bushed with nonferrous bushings, which provide satisfactory contact and wearing surfaces.
Industry:Mining
