- 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 starter used on large coal haulers that permits the elimination of all batteries except the 6-V units for the headlights. These starters are operated by compressed air supplied at 100 psi (690 kPa) from a storage tank on the tractor. Trucks can stand idle for 4 or 5 days and there is still enough air in the tanks to start the engines.
Industry:Mining
A state in which a material is heated to full incandescence so as to emit all the rays in the visible spectrum in such proportion as to appear dazzling white.
Industry:Mining
A state of balance between two opposing chemical reactions. The amount of any substance being built up is exactly counterbalanced by the amount being used up in the other reaction, so that concentrations of all participating substances remain constant.
Industry:Mining
A state of collapse that interferes with the normal heart action, respiration, and circulation. This condition is probably due to derangement or lack of proper balance within the sympathetic nervous system and may be caused by any number of things, such as serious injury, loss of blood, severe burns, fright, and many others. It is important to look for shock when rendering first aid since it may cause death even when the injury is less serious.
Industry:Mining
A state of colloidal suspension in which the individual particles are separate from one another, this condition being maintained by the attraction of the particles for the dispersing medium (for example, hydration) or by the assumption of like electrical charges by the particles, thus resulting in their mutual repulsion, or both. It is generally possible to deflocculate a gel to such an extent that it loses its gel strength entirely, thus becoming a Newtonian fluid, in which case it is known as a sol. The relative contribution of hydration and electrostatic repulsion to the deflocculation of a suspension accounts in large measure for the wide variation in viscosities and gel strengths of suspensions partially flocculated by different means; as, e.g., a partial flocculation of drilling fluid by cement on one hand, and by salt water on the other. Some suspensions can be deflocculated repeatedly by mechanical agitation alone, thus giving a reversible gel-sol, sol-gel transformation known as thixotropy.
Industry:Mining
A state of strain in which all displacements that arise from deformation are parallel to one plane, and the longitudinal strain is zero in one principal direction.
Industry:Mining
A state of stress in which the normal stresses acting on any plane are equal and where shearing stresses do not exist in the material.
Industry:Mining
A State tax imposed on the severing of natural resources from the land based on the value or quantity of production. These types of taxes are usually calculated either as a flat rate per unit of production (sometimes called a "unit" or "specific" severance tax), or as a percentage of the value of the resource produced (sometimes called an "ad valorem" or "percentage" severance tax). The tax base for an ad valorem severance tax is generally either the gross or net value of resources produced or sold.
Industry:Mining
A state where d electrons are ordered in an antiparallel array, giving materials small positive values for magnetic susceptibility and weak attraction to an external magnetic field. Compare: ferrimagnetism; ferromagnetism; superexchange.
Industry:Mining
