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

Related Terms

AMBIENT NOISE

The normal sound in a room or other location.

LAMINAR FLOW

A flow situation in which fluid moves in parallel lamina or layers.

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.

SHEAR RATE

The difference between the velocities along the parallel faces of a fluid element divided by the distance between the faces.

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.

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.

GRID PARALLEL

A line parallel to a grid equator, connecting all points of equal grid latitude

HORIZONTAL

Parallel to the plane of the horizon; perpendicular to the direction of gravity

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.

SUPERSATURATED SOLUTION

A solution of a salt or mineral with a concentration beyond the normal saturation point.

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