- 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 ...
The abnormal ratio of magnetization to the magnetizing force responsible for it, as observed in some crystals, such as those of bismuth.
Industry:Mining
The abrupt and large increase in electrical conductivity exhibited by some materials at very low temperatures.
Industry:Mining
The absolute meter-kilogram-second (mks) unit of power that equals 1 absolute joule per second; the standard in the United States; equals 1/746 hp. Abbrev., w and W.
Industry:Mining
The absolute temperature scale in which the temperature measure is based on the average kinetic energy per molecule of a perfect gas. The zero of the Kelvin scale is -273.16 degrees C. The temperature scale adopted by the International Bureau of Weights and Measures is that of the constant volume hydrogen gas thermometer. The magnitude of the degree in both these scales is defined as one one-hundredths the difference between the temperature of melting ice and that of boiling water at 760 mm pressure.
Industry:Mining
The absorption of oxygen from the air by coal, particularly in the crushed state; this engenders heat which can result in fire. Ventilation, while dispersing the heat generated, supports oxidation that increases rapidly with a rise in temperature. Fresh air should not gain access to the coal.
Industry:Mining
The achievement of a bit as gaged by the overall cost of using a specific bit per a unit measure of borehole drilled, or by the total number of feet of borehole drilled per bit.
Industry:Mining
The acoustic impedance of a given surface area of an acoustic medium perpendicular, at every point, to the direction of propagation of sinusoidal acoustic waves of given 39 frequency, and having equal acoustic pressures and equal volume velocities per unit area at every point of the surface at any instance, is the quotient obtained by dividing (1) the phasor corresponding to the acoustic pressure by (2) the phasor corresponding to the volume velocity.
Industry:Mining
The acoustic-energy pulse transmitted through the air as a result of a pressure (sound) source; e.g., explosion, near-surface seismic shot, or supersonic aircraft.
Industry:Mining
The act of applying lubricants. There are two main types of lubricants, solid and liquid. Examples of the solid type are graphite, French chalk, and sulfur. Liquid lubricants are by far the more important, and among these, oils and greases are the most common.
Industry:Mining
