- 行业: Mining
- Number of terms: 33118
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- 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 rate at which energy is consumed, in horsepower or kilowatt units, in moving air between two points.
Industry:Mining
The rate at which heat is produced by a steady current in any part of an electric circuit is jointly proportional to the resistance and to the square of the current.
Industry:Mining
The rate of flow of water under laminar flow conditions through a unit cross-sectional area of a porous medium under a unit hydraulic gradient and a standard temperature, usually 20 degrees C.
Industry:Mining
The rate of increase of temperature in the Earth with depth. The gradient differs from place to place depending on the heat flow in the region and the thermal conductivity of the rocks. The average geothermal gradient in the Earth's crust approximates 25 degrees C per kilometer of depth.
Industry:Mining
The rate of transformation of a unit mass during a chemical reaction.
Industry:Mining
The rate that a metal or alloy is removed because of corrosion. This may be expressed in terms of loss in weight or loss of thickness in a given period of time. (Corrosion rates in terms of thickness change refer to the loss of metal from one side only.)
Industry:Mining
The rate, expressed as either velocity or volume, at which water percolates through a porous medium.
Industry:Mining
The rate, expressed in feet (meters) per minute, at which a given size and shape of rock particle will descend or settle in water; e.g., the slip velocity in water of a round, flat particle of rock, 1/2 in (1.27 cm) in diameter, is about 54 ft/min (16.5 m/min).
Industry:Mining
The ratio (normally expressed as a percentage) between the actual yield of a desired product and the theoretically possible yield (based on the reconstituted feed), both actual and theoretical products having the same percentage of ash.
Industry:Mining
The ratio between the air horsepower and the indicated horsepower of a driving unit. The percentage is expressed by air horsepower x 100/indicated hp of driving unit. Measurements are taken of the air pressure and volume in the fan drift, and the power absorbed by the driving unit.
Industry:Mining
