- 産業: 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 concept used to describe the distribution of energy among waves of different period. Wave speed increases with wave length, so distant storms may be detected by the increase of energy in long period waves. Sea is fully developed when all possible wave frequencies possess energies appropriate to the spectrum for the prevailing wind speed.
Industry:Mining
A conception or proposition that is tentatively assumed, and then tested for validity by comparison with observed facts and by experimentation; e.g., the planetesimal hypothesis to explain the evolution of the planets. It is less firmly founded than a theory.
Industry:Mining
A concordant igneous intrusion with a known or assumed flat floor and a postulated, dikelike feeder commonly thought to be beneath its thickest point. It is generally planoconvex in form and roughly circular in plan, less than 5 miles (8 km) in diameter, and from a few feet to several hundred feet in thickness.
Industry:Mining
A concordant intrusive in the crest of an anticline and trough of a syncline; in cross section, it has the shape of a doubly convex lens. Adj: phacolithic.
Industry:Mining
A concrete made of 3 parts coke breeze, 1 part sand, and 1 part portland cement. It has poor fire-resisting qualities but it is cheap and nails can be driven into it.
Industry:Mining
A concrete mixer with a rotating drum, which is tilted to discharge its contents.
Industry:Mining
A concrete mixer, generally mounted on a lorry, or crawler-type tracks, which mixes concrete during the journey from the batching plant to the construction site.
Industry:Mining
A concretionary nodule of clay ironstone about the size of a walnut that the ancients believed an eagle takes to her nest to facilitate egg-laying.
Industry:Mining
A concretionary nodule of clay ironstone about the size of a walnut that the ancients believed an eagle takes to her nest to facilitate egg-laying.
Industry:Mining
