- 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 ...
The residuum from the distillation of petroleum. When paraffin is obtained from petroleum, the original oil is said to have a paraffin base; when the residue is entirely asphaltic, the original petroleum is said to have an asphaltic base. Some petroleums have both an asphaltic and a paraffin base.
Industry:Mining
The resilient type of coupling has many designs but essentially has torsional response to application or variation of the transmitted load. For the all-metal types, the resilient element may be in the form of laminated spring packs or a cylindrical grid member, connecting the driver and driven hubs. Resilience damps shock loads and also provides means of keeping gear teeth in contact, compensating for small errors in gear cutting. Other types use rubber or rubberlike material that may be in the form of a spider, segmental blocks, a number of balls, or a molded disk with metal inserts, providing the connection between the driver and driven hubs.
Industry:Mining
The resistance between the blasting circuit, including lead wires, and the ground.
Industry:Mining
The resistance observed between a grounded electrode and the ground, or between an electrode and a rock specimen.
Industry:Mining
The resistance of a mine airway obstruction, duct or pipe elbow, valve, damper, orifice, bend, fitting, or other obstruction to flow, expressed in the number of feet of straight airway, duct, or pipe of the same cross section that would have the same resistance.
Industry:Mining
The resistance of a section of roadway in which there is a pressure of 1 lb/ft<sub>2</sub>(6.9 kPa) throughout the section, when an amount of 1,000 ft<sub>3</sub>/s (1 kilocusec or 28.3 m<sub>3</sub>/s) of dry air at 60 degrees F (15.6 degrees C) and 30 in (762 mm) barometer is passing.
Industry:Mining
The resistance that must be overcome to dig a formation. This resistance is made up largely of hardness, coarseness, friction, adhesion, cohesion, and weight.
Industry:Mining
The resistance to flow exerted on the perimeter or contact surface between a stream and its containing conduit, due to the roughness characteristic of the confining surface, which induces a loss of energy. Energy losses arising from excessive turbulence, impact at obstructions, curves, eddies, and pronounced channel changes are not ordinarily ascribed to hydraulic friction.
Industry:Mining
The resistance to motion due to friction per unit weight hauled.
Industry:Mining
