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A type of computerized display which consists of a single layer of data; individual elements cannot be manipulated.



Related Terms

RCDS

Raster Chart Display System

ROLLOVER

The phenomenon where the stability of two stratified layers of liquid of differing relative density is disturbed resulting in a spontaneous rapid mixing of the layers accompanied in the case of liquefied gases, by violent vapor evolution.

LAMINAR FLOW

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

POISE

A measure of viscosity (absolute viscosity) numerically equal to the force required to move a plane surface of one square centimeter per second when the surfaces are separated by a layer of fluid one centimeter in thickness. It is the ratio of the shearing stress to the shear rate of a fluid and is expressed in dyne seconds per square centimeter (DYNE SEC/CM2); 1 centipoise equals .01 poise.

SHEAR RATE

Rate at which adjacent layers of fluid move with respect to each other, usually expressed as reciprocal seconds.

SHEAR STRESS

Frictional force overcome in sliding one layer of fluid along another, as in any fluid flow. The shear stress of a petroleum oil or other Newtonian fluid at a given temperature varies directly with shear rate (velocity). The ratio between shear stress and shear rate is constant; this ratio is termed viscosity of a Newtonian fluid, the greater the shear stress as a function of rate of shear. In a non-Newtonian fluid, such as a grease or a polymer-containing oil (e.g. multi-grade oil) - shear stress is not proportional to the rate of shear. A non-Newtonian fluid may be said to have an apparent viscosity, a viscosity that holds only for the shear rate (and temperature) at which the viscosity is determined.

ZETA POTENTIAL

The difference in voltage between the surface of the diffuse layer surrounding a colloidal particle and the bulk liquid beyond.

SHIFT COLORS

Changing the flag and pennant display when a moored vessel becomes underway, and vice versa. A highly coordinated display that ships take pride in; the desired effect is that of one set of flags vanishing while another set flashes out at precisely the same time.

BACK ECHO

The effect on a radar display produced by a back lobe of a radar antenna. See also SIDE ECHO

ECDIS

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