- 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 basic unit of absorbed dose of ionizing radiation. One radiation absorbed dose (abbrev., rad) equals the absorption of 100 ergs of radiation energy per gram of matter.
Industry:Mining
The bearing expressed as a horizontal angle between a geographic meridian and a line on the Earth; esp. a horizontal angle measured clockwise from true north. Compare: magnetic bearing
Industry:Mining
The bearing expressed as a horizontal angle between the local magnetic meridian and a line on the Earth; a bearing measured clockwise from magnetic north. It differs from a true bearing by the amount of magnetic declination at the point of observation.
Industry:Mining
The bed of an unnavigable river is open to location and patent as public land, when the opposite banks thereof have not passed into private ownership. Proprietors bordering on such streams, unless restricted by the terms of their grant from the government, hold to the center of the stream, notwithstanding the running of meander lines on the banks thereof, as the true boundary of the land is the thread of the stream.
Industry:Mining
The bedrock or reef rising from the lowest and richest part of an alluvial placer and forming the slopes of the ancient valley.
Industry:Mining
The behavior of a fan under various conditions cannot be expressed in simple mathematics but may be shown graphically by suitable curves, known as the fan's characteristic curves or characteristics. The curves of interest are generally head versus air quantity, power versus air quantity, and efficiency versus air quantity.
Industry:Mining
The belt of marine deposition extending from the coast (high watermark) to a depth of about 100 fathoms (183 m); i.e., corresponding roughly with the continental shelf (in the 286 wide sense, to include the shore); passing into the mud belt at the inner mud line.
Industry:Mining
