An antenna consisting of a mirror in the shape of part of a parabolic cylinder bounded by two parallel plates normal to the cylinder axis, and of an antenna feed placed on or near the focal point
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AMBIENT NOISE
The normal sound in a room or other location.
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LAMINAR FLOW
A flow situation in which fluid moves in parallel lamina or layers.
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HYDRODYNAMIC LUBRICATION
A system of lubrication in which the shape and relative motion of the sliding surfaces causes the formation of a fluid film having sufficient pressure to separate the surfaces.
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SHEAR RATE
The difference between the velocities along the parallel faces of a fluid element divided by the distance between the faces.
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FLUID
A substance readily assuming the shape of the container in which it is placed; e.g. oil, gas, water or mixtures of these. A general classification including liquids and gases.
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BYPASS FILTRATION
A system of filtration in which only a portion of the total flow of a circulating fluid system passes through a filter at any instant or in which a filter having its own circulating pump operates in parallel to the main flow.
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GRID PARALLEL
A line parallel to a grid equator, connecting all points of equal grid latitude
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HORIZONTAL
Parallel to the plane of the horizon; perpendicular to the direction of gravity
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SOLID
Any substance having a definite shape which it does not readily relinquish. More generally, any substance in which the force required to produce a deformation depends upon the magnitude of the deformation rather than upon the rate of deformation.
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SUPERSATURATED SOLUTION
A solution of a salt or mineral with a concentration beyond the normal saturation point.
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