A cross-track scanner deployed on Landsat that records seven bands of data
from the visible through the thermal IR regions.
See:multispectral scanner
An orthorhombic mineral, Na2 SO4 ; soft; forms masses and
crusts in evaporite deposits and around fumaroles; a source of sodium
sulfate. Also called verde salt.
A precision surveying instrument that is used for measuring angular
distances in both vertical and horizontal planes.
The water gage produced by an imaginary fan that is perfect and is
connected to an evase chimney of infinite height to eliminate kinetic
losses at discharge. Its calculated value depends only on the speed of the
blade tips and on the shape of the blades.
See also:manometric efficiency; initial depression. Nelson
The depression that can be produced by a perfect fan. BS, 8
The maximum yield (as shown by the washability curve) of a product with a
specified percentage of ash. BS, 5
The theory that the contents of a vein or lode are derived from the
adjacent country rock by a leaching process, in which either superficial
water or thermal water is involved.
Comprises the study of the relative motion between the parts of a machine
and the study of the forces that act on those parts.
See also:machine design
A group of mafic plutonic rocks composed of calcic plagioclase,
feldspathoids, and augite, with lesser amounts of sodic sanidine and sodic
amphiboles and accessory olivine; also, any rock in that group; the
intrusive equivalent of tephrite. Theralite grades into nepheline
monzonite with an increase in the alkali feldspar content, into gabbro as
the feldspathoid content diminishes, and into diorite with both fewer
feldspathoids and increasingly sodic plagioclase. The term, defined by
Rosenbusch in 1887, is derived from the Greek word for eagerly looked for,
not from the island of Thera (Santorini). AGI
Equals 100,000 Btu (105,500 kJ). Newton, 1
Hot or warm; applied to springs that discharge water heated by natural
agencies. Fay
A physiological method of assessing the effect of a given climate upon
workers, that is based on the ratio between the heat actually lost by the
body via the skin, lungs, etc., and the maximum that can be lost in the
prevailing conditions. Roberts, 1
a. A method for determining transformations in a metal by noting the
temperatures at which thermal arrests occur. These arrests are manifested
by changes in slope of the plotted or mechanically traced heating and
cooling curves. ASM, 1
b. The study of chemical and/or physical changes in materials as a
function of temperature, i.e., the heat evolved or absorbed during such
changes. AGI
Use of high-temperature flame to fuse rock in drilling. Heat comes from
ignition of kerosene with oxygen or other fuel system, at bottom of drill
hole, and water with compressed air may be used to flush out the products.
Pryor, 3
a. Heat required to raise the temperature of a body 1 degrees C.
Syn:heat capacity
b. The amount of heat that a clay product will absorb, usually expressed
in British thermal units per degree Fahrenheit (kilojoules per degree
Celsius). ACSG, 2
a. The time rate of transfer of heat by conduction, through unit
thickness, across unit area for unit difference of temperature.
AGI
b. A measure of the ability of a material to conduct heat. Typical values
of thermal conductivity for rocks range from 3 to 15 mcal/cm/s/ degrees C
(12.6 to 62.8 kJ/cm/s/ degrees C). Syn:heat conductivity;
thermal diffusivity of strata. AGI
A device fitted in hydraulic power systems underground so that
temperatures cannot rise above about 85 degrees C. It is a safeguard
against fire risk due to a rapid rise in temperature if the fluid circuit
is interrupted by wrong manipulation of valves, etc. Nelson
a. The evaporation of water by thermal means from a mixture of coal and
water. See also:McNally-Vissac dryer; multilouvre dryer;
Raymond flash dryer; cascade coal dryer; flash coal dryer;
fluidized bed dryer. Mitchell
b. The application of heat (generally hot-air currents) to wet coals and
other materials and the evaporation of the free moisture and also part of
the inherent moisture. Nelson
The ratio of the electric power produced by a powerplant to the heat value
of the fuel consumed; thus, a measure of the efficiency with which the
plant converts thermal energy to electric energy. Symbol, eta .
Lyman; Handbook of Chemistry and Physics, 2