- Industry: Mining
- Number of terms: 33118
- Number of blossaries: 0
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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 ...
In a solid, the force per unit area, acting on any surface within it, and variously expressed as pounds or tons per square inch, or dynes or kilograms per square centimeter; also, by extension, the external pressure that creates the internal force. The stress at any point is mathematically defined by nine values: three to specify the normal components and six to specify the shear components, relative to three mutually perpendicular reference axes. Compare: strain shear stress.
Industry:Mining
In a specified direction at any point, the average rate of sound energy transmitted in the specified direction through a unit area normal to this direction at the point considered.
Industry:Mining
In a study of process costs (in large or in detail) a series of costs-per-unit observed and recorded at regular intervals (usually in monthly financial summaries cross referenced to analyzed detail cost). Twelve months are covered and each month the new month's figures are added and those for the corresponding month of the previous year are removed. Therefore, like periods are always compared and seasonal fluctuations are smoothed out. Abbrev., MAT.
Industry:Mining
In a system where air (or other reactant gas) and a flammable gas are present, that region in which the two gases have mixed to produce a gas capable of propagating flame.
Industry:Mining
In a torque converter, a set of fixed vanes that change the direction of flow of fluid entering the pump or the next stage turbine.
Industry:Mining
In a transparent gemstone, the proportion of the mass above and below the girdle, as well as the angles of the facets in relation to the girdle, that produces the greatest brilliancy from the particular species. These proportions vary with the refractive index of the gem species.
Industry:Mining
In a twin crystal, a plane through which one twin individual forms a mirror image of the other, or the plane at right angles to the axis about which one individual is rotated with respect to the other. The twin plane is commonly the composition plane across which the individuals are joined. With rare exceptions, a twin plane is a possible crystal face for the crystal individuals.
Industry:Mining
In a twist drill, the tapered and relieved cutting portion situated between the pilot drill and the body.
Industry:Mining
In a wide excavation where strutting is required, this is a long pile driven at the strut spacing in the center of the trench before excavation is started.
Industry:Mining
