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The extended element of a heat-transfer device that effectively increases the surface area.

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A device in which charges are introduced when light from a scene is focused on the surface of the device; image points are accessed sequentially to produce a television-type output signal. Also known as solid-state image sensor.


A measurement device in which variations in pressure upon a capacitive element proportionately change the element's capacitive rating and thus the strength of the measured electric signal from the device.


  1. An iron or steel bar that is usually bent and has a wedge-shaped working end; used as a lever and for prying. 2. A device or action that in effect places a high overload on the actuating element of a circuit breaker or other protective device, thus triggering it.


As defined by the International Telecommunication Union (ITU), in the maritime radionavigation service, a receiver-transmitter device which, when triggered by a surface search radar, automatically returns a distinctive signal which can appear on the display of the triggering radar, providing range, bearing and identification information. Also called RADAR TRANSPONDER BEACON.


A semiconductor device wherein minority charge is stored in a spatially defined depletion region (potential well) at the surface of a semiconductor and is moved about the surface by transferring this charge to similar adjacent wells. Abbreviated CCD.


  1. An opening in a lock for passage of a flat metal key. 2. The pocket in the driven element to provide a driving surface for the key. 3. A groove or channel for a key in any mechanical part. Also known as key seat.


  1. An electronic element that cannot be divided without destroying its stated function; commonly applied to active elements such as transistors and transducers. 2. A mechanism, tool, or other piece of equipment designed for specific uses.


In a given direction, at a point on the surface of a source or receptor, or at a point on the path of a beam, the quotient of the luminous flux leaving, arriving at, or passing through an element of surface at this point and propagated in directions defined by an elementary cone containing the given directions, by the product of the solid angle of the cone and the area of the orthogonal projection of the element of surface on a plane perpendicular to the given direction. The derived unit of luminance in the International System of Units is the CANDELA PER SQUARE METER.


An element of a computer consisting of the hard surface on which components are mounted. A completed card performs one or more specific functions, such as graphics.


A device for indicating the horizontal, such as a bubble, gyroscope, pendulum, or the surface of a liquid.

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