- 行业: Mining
- Number of terms: 33118
- Number of blossaries: 0
- Company Profile:
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 test conducted by detonating a standard quantity of explosives under water and measuring both the detonation and gas pressures using transducers; useful for evaluating the relative strengths of various explosives.
Industry:Mining
A test designed to assess the value of antifouling compositions by measuring the rate of loss of toxic ingredients from a painted surface during immersion in seawater.
Industry:Mining
A test designed to determine relative fusibility of frit or powder. So called because the completed specimens resemble buttons.
Industry:Mining
A test for detecting glass imitations; if a crystalline substance such as a gem mineral is placed on a piece of dry ice (solid CO<sub>2</sub>), a squeaking noise can be heard. This is not true of noncrystalline substances such as glass or plastic.
Industry:Mining
A test for determining relative ductility of metal that is to be formed, usually sheet, strip, plate, or wire, and for determining soundness and toughness of metal. The specimen is usually bent over a specified diameter through a specified angle for a specified number of cycles.
Industry:Mining
A test for determining the hardness of a material by forcing a hard steel or carbide ball of specified diameter into it under a specified load. The result is expressed as the Brinell hardness number, which is the value obtained by dividing the applied load in kilograms by the surface area of the resulting impression in square millimeters. Compare: Vickers hardness test
Industry:Mining
A test in which a cylindrical specimen of rock encased in an impervious membrane is subjected to a confining pressure and then loaded axially to failure.
Industry:Mining
A test in which a cylindrical specimen of rock encased in an impervious membrane is subjected to a confining pressure and then loaded axially to failure.
Industry:Mining
A test in which an undisturbed sample of clay measuring 6 cm in diameter and 2 cm thick is confined laterally in a metal ring and compressed between two porous plates that are kept saturated with water. A load is applied and the clay consolidates, the excess pore water escaping through the porous stones. After each increment of load is applied, it is allowed to remain on the sample until equilibrium is established, and a consolidation curve showing the deformation with time is obtained for each increment.
Industry:Mining
A test in which coal dust is placed in each of two connected parallel entries.
Industry:Mining
