- 行业: Mining
- Number of terms: 33118
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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 ...
A numerical factor that measures the internal resistance of a fluid to flow; it equals the shearing force in dynes per square centimeter transmitted from one fluid to another that is 1 cm away, and generated by the difference in fluid velocities of 1 cm/s in the two planes. The greater the resistance to flow, the larger the coefficient.
Industry:Mining
A numerical factor that measures the internal resistance of a fluid to flow; it equals the shearing force in dynes per square centimeter transmitted from one fluid to another that is 1 cm away, and generated by the difference in fluid velocities of 1 cm/s in the two planes. The greater the resistance to flow, the larger the coefficient.
Industry:Mining
A numerical method used in gravity interpretation for calculating the depth to the source of many typical total field anomalies. The method involves the computation of the curvature of the observed total intensity by superposition of a special grid over the intensity contours. The curvature is proportional to the second vertical derivative of the magnetic intensity.
Industry:Mining
A numerical quantity used as an index to characterize the type of flow in a hydraulic structure in which resistance to motion depends on the viscosity of the liquid in conjunction with the resisting force of inertia. It is the ratio of inertia forces to viscous forces, and is equal to the product of a characteristic velocity of the system (e.g., the mean, surface, or maximum velocity) and a characteristic linear dimension, such as diameter or depth, divided by the kinematic viscosity of the liquid; all expressed in consistent units in order that the combinations will be dimensionless. The number is chiefly applicable to closed systems of flow, such as pipes or conduits where there is free water surface, or to bodies fully immersed in the fluid so the free surface need not be considered.
Industry:Mining
A numerical value indicating the relation between a change in temperature and a simultaneous change in some other property (e.g., solubility). Specif., the factor a in the equation R<sub>t</sub>= R<sub>0</sub>(1 at), in which R<sub>t</sub>equals the resistance of a conductor at t degrees C, and R <sub>0</sub>equals its resistance at 0 degrees C.
Industry:Mining
A numerical value indicating the relation between a change in temperature and a simultaneous change in some other property (e.g., solubility). Specif., the factor a in the equation R<sub>t</sub>= R<sub>0</sub>(1 at), in which R<sub>t</sub>equals the resistance of a conductor at t degrees C, and R <sub>0</sub>equals its resistance at 0 degrees C.
Industry:Mining
A one-shot bore-hole-surveying instrument having the horizontal (compass) and vertical indicator markings painted with a radioactive substance, such as that on the luminous dial of a watch. The positions of these markings are recorded on small, circular, photographic film.
Industry:Mining
