- 업종: 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 complete continuous seismic profiling system consists of the boomer unit, sonar recorder, transducer fish, receiving hydrophone, preamplifier, if necessary, and variable filter. Sonar boomer units are available from 1000 W-second models up to 13,000 Wsecond (experimental models). The standard boomer consists of a power supply, capacitor bank and transducer. Boomers are used for marine geological studies and dredging surveys. The power supply output is fed to the capacitor bank, which is discharged into the transducer producing a precisely repeatable pressure pulse in the water.
Industry:Mining
A complete set of operations. In excavation, it usually includes breaking, loading, moving, dumping, and returning to the loading point.
Industry:Mining
A complex, connected series of several more or less parallel mountain ranges and mountain systems grouped together without regard to similarity of form, structure, and origin, but having a general longitudinal arrangement or well-defined trend; e.g., the Mediterranean mountain chain of southern Europe.
Industry:Mining
A component of a rock fabric that acts as a unit in response to deformative forces.
Industry:Mining
A composite gneiss with irregular layering. The term is generally used in the field and has no genetic implications (Dietrich, 1960). Compare: venite; composite gneiss.
Industry:Mining
A composite metal containing two or three layers that have been bonded together. The bonding may have been accomplished by corolling, welding, casting, heavy chemical deposition, or heavy electroplating.
Industry:Mining
A composite of mean radiant temperature and air temperature; also defined as the mean temperature of the environment effective in controlling the rate of sensible heat loss from a black body in still air when the surface temperature and size of the black body are comparable to those of the human body. Where the enclosure surface (mean radiant temperature) and air temperatures are equal, this temperature is also the British equivalent temperature; when not equal, the British equivalent temperature is that temperature at which a body with an 80 degrees F (26.7 degrees C) surface temperature will lose sensible heat at the same rate as in the given environment.
Industry:Mining
A composite of mean radiant temperature and air temperature; also defined as the mean temperature of the environment effective in controlling the rate of sensible heat loss from a black body in still air when the surface temperature and size of the black body are comparable to those of the human body. Where the enclosure surface (mean radiant temperature) and air temperatures are equal, this temperature is also the British equivalent temperature; when not equal, the British equivalent temperature is that temperature at which a body with an 80 degrees F (26.7 degrees C) surface temperature will lose sensible heat at the same rate as in the given environment.
Industry:Mining
A composite of two or more crystal individuals having a definite crystallographic relationship to each other. The orientation of one individual may be the mirror image of the other across a twin plane, or an orientation that can be derived by rotating the twin portions about a twin axis, or some other rational twin law. Twinned individuals in a twin crystal commonly show reentrant angles between crystal faces or on cleavage planes. A twin crystal may exhibit symmetry higher than that of its crystal individuals.
Industry:Mining
A composite rock composed of igneous or igneous-appearing and/or metamorphic materials that are generally distinguishable megascopically.
Industry:Mining
