- 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 curve obtained in fatigue tests by subjecting a series of specimens of a given material to different ranges of stress and plotting the range of stress against the number of cycles required to produce failure. In steel and many other metals, there is a limiting range of stress below which failure will not be produced even by an indefinite number of cycles.
Industry:Mining
A curve or graph showing the results of a series of float-and-sink tests. A number of these curves are drawn to illustrate different conditions or variables, usually on the same axes, thus presenting the information on one sheet of paper. Washability curves are essential when designing a new coal or mineral washery. There are four main types of washability curves: characteristic ash curve, cumulative float curve, cumulative sink curve, and densimetric or specific gravity curve.
Industry:Mining
A curve showing the float-sink percentage of each density fraction of the feed coal. The quantity of clean coal recovered is plotted against the mean densities of the density fraction. From this curve the specific gravity of separation and the sharpness of the separation can be determined. Such a curve is independent of the coal being washed and is characteristic of a specific coal-washing device.
Industry:Mining
A curve similar to a load extension curve, except that the load is divided by the original cross-sectional area of the test piece and expressed as tons or pounds per square inch, 3137 while the extension is divided by the length over which it is measured and expressed in inches per inch.
Industry:Mining
A curved dike or sheet that is part of a concentric set of such forms that dip inward.
Industry:Mining
A curved downward-flattening fault, generally concave upward. Listric faults may be characterized by normal or reverse separation.
Industry:Mining
A curved line connecting the points of the maximum destructive energy of an earthquake shock around its epicenter.
Industry:Mining
A curved surface in a quaternary system, representing the intersection of two primary phase volumes, one or both of which are solid solution series. It is the bivariant equivalent of the univariant cotectic line in ternary systems.
Industry:Mining
A cushioning device to reduce the impact of coal in motion against objects with which it may come into contact, with a view to avoiding fracture of the coal.
Industry:Mining
