18WuD2x

D 1. Symbol for DEUTERIUM. 2. Symbol for ELEC-
TRIC DISPLACEMENT. 3. Symbol for ELECTRIC
FLUX DENSITY. 4. Symbol for DISSIPATION
FACTOR. 5. Symbol for drain (see DRAIN, 3). 6.
Abbreviation of DISSIPATION. 7. Symbol for determinant.
8. Symbol for DIFFUSION CONSTANT.
d 1. Abbreviation of DECI. 2. Symbol for DIFFER-
ENTIAL. 3. Symbol for distance. 4. Symbol for
DENSITY. 5. Symbol for drain (see DRAIN, 3). 6.
Abbreviation of DISSIPATION. 7. Abbreviation of
day. 8. Abbreviation of DEGREE. 9. Abbreviation
of diameter. 10. Abbreviation of DRIVE.
D/A Abbreviation of DIGITAL-TO-ANALOG. See
DIGITAL-TO-ANALOG CONVERSION.
dA 1. Symbol for DIFFERENTIAL OF AREA. 2.
Symbol for differential of amplification. 3. Seldomused
abbreviation of deciampere.
da Abbreviation of DEKA.
DAC Abbreviation of DIGITAL-TO-ANALOG CON-
VERTER.
DACI Abbreviation of direct adjacent-channel interference.
DAGC Abbreviation of DELAYED AUTOMATIC
GAIN CONTROL.
daisy chain A method of transferring a signal in a
computer from one stage to the next.
daisy wheel A form of printing device consisting
of a disk having several dozen radial spokes,
each of which has a character molded on its
face. The disk rotates to the proper position in
the printing process, and a hammer strikes the
spoke to press the molding against the ribbon
and paper.
DAM Abbreviation of data-addressed memory.
Damon effect The change that the susceptibility of
ferrite undergoes under the influence of high RF
power.
damped galvanometer A galvanometer with a provision
for overswing limiting or oscillation prevention.
damped loudspeaker A loudspeaker in which undesirable
excursions are prevented by damping in
the associated amplifier or speaker circuit.
damped meter 1. A meter with a provision for
overswing limiting or oscillation prevention. 2. A
meter that is protected during transport by a
shorting bus between the two meter terminals.
damped natural frequency 1. The frequency at
which a damped system having one degree of
freedom will oscillate after momentary application
of a transient force. 2. In the presence of
damping, the rate at which a sensing element oscillates
freely.
damped oscillations Oscillations in which the amplitude
of each peak is lower than that of the preceding
one; the oscillation eventually dies out (the
amplitude becomes zero). Compare CONTINU-
OUS WAVE.
damped speaker See DAMPED LOUDSPEAKER.
damped wave A wave whose successive peaks decrease
in amplitude (i.e., it decays), eventually
reaching an amplitude of zero. Compare CONTIN-
UOUS WAVE and UNDAMPED WAVE.
damped-wave decay See DECREMENT, 1.
dampen To cause the amplitude of a signal to
decay.
damper See DAMPING DIODE.
damper diode See DAMPING DIODE.
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