- 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 ...
A bench vise that may be rotated on its base to bring the work that it holds into better position.
Industry:Mining
A bend in a haulage road, which may be horizontal, vertical, or both. On main haulage roads, curves may be 100 ft (30.5 m) in radius or more. With a good rail track and smooth curves, haulage speeds up to 20 mph (32.2 km/h) can be maintained. A useful rule for determining the minimum radius of curvature for tramming is R = 12 to 15 x W; for locomotive haulage R = 20 to 25 x W, where W is the maximum wheel base of the rolling stock or locomotive.
Industry:Mining
A bending moment that produces concave bending at midspan of a simply supported beam, generally termed a positive bending moment. It is the opposite of a negative or hogging moment, which would occur at the supports.
Industry:Mining
A bentonite containing easily exchangeable alkali cations and having original properties that are not permanently destroyed by the action of sulfuric acid, but can be restored by treatment with an alkali salt followed by regulated dialysis. This group includes Wyoming-type bentonite and other similar bentonites.
Industry:Mining
A bentonite containing easily exchangeable alkaline-earth cations and, either before or after acid treatment, capable of being made to assume properties of an alkali bentonite by treatment with an alkali salt followed by regulated dialysis.
Industry:Mining
A bentonite containing easily replaceable alkali bases but having original properties that are destroyed by acid treatment.
Industry:Mining
A beryllium oxide with dihexagonal-pyramidal crystals from Langban, Sweden. See: beryllium oxide.
Industry:Mining
