18WuD2x

eluctivity • replacement 593
reluctivity Specific reluctance (i.e., the reluctance
of a sample of magnetic material one centimeter
long and one square centimeter in cross section).
Reluctivity is the reciprocal of permeability.
rem Acronym for roentgen equivalent man, an
amount of ionizing radiation having the same effect
on the body as a one-roentgen dose of gamma
or X radiation.
remagnetizer A magnetizer used principally to restore
weakened permanent magnets.
remainder 1. The result of subtracting one quantity
(the subtrahend) from another (the minuend).
Also called DIFFERENCE. 2. In division, the numerical
value left over after the integral part of
the quotient has been determined; it becomes the
fractional part when divided by the divisor. For
example, in 25/3, the remainder is 1.
remanence See RESIDUAL MAGNETISM.
remanent flux density See REMANENCE.
remodulator Any device that changes the modulation
of a signal from one form to another, such as
from frequency modulation to amplitude modulation,
without loss of intelligence.
remote alarm In security systems, an alarm that
occurs at a location different from where an intrusion
occurs (e.g., at the headquarters of a security
company).
remote control Control of distant devices by mechanical
means or by radio-frequency signals
sent from a transmitter especially designed for
the purpose; in the latter case, it is sometimes
called radio control.
remote-control receiver The complete device that
selects, amplifies, and demodulates or rectifies a
radio signal for control of a circuit or mechanism
at a distance from the transmitter of the control
signal. Some receivers have self-contained antennas.
remote-control transmitter The complete device
that generates radio-frequency power, adds to it
the signals needed for remote control, and radiates
the modified power.
remote-control system The complete set of hardware
units and software programs facilitating the
operation of a computer or robot from a distance.
remote data terminal In a computer system, a
terminal connected to the central processor by a
telephone line or radio link. It is used for the
transfer of data without providing control of the
system. Also called remote data station.
remote error sensing A method of regulation used
in some power supplies. The voltage across the
load, or the current through the load, is determined
by remote control. The power-supply output
is adjusted to compensate for losses in the
system.
remote job entry In computer operations, the keying-in
of input data at a site physically distant
from the central processor.
remote tuning The electrical or radio tuning of a
circuit or device from a distance.
rendering In three-dimensional computer animation,
the software process in which all the aspects
of the model are combined to obtain the presentation.
rep 1. Acronym for roentgen equivalent physical,
an amount of ionizing radiation that, upon absorption
by body tissue, will develop the energy of
a one-roentgen dose of gamma or X radiation.
2. Colloquial abbreviation for repetition, as in rep
rate. 3. Colloquial abbreviation for representative,
as in service representative.
repeatability The ability of an instrument, system,
or method to give identical performance or results
in successive instances.
repeater A receiver/transmitter device that retransmits
a signal it receives from another
source, often simultaneously. In this way, a signal
can be transmitted on several frequencies, or
the service area of the original station can be extended.
Also see ONE-WAY REPEATER and TWO-
WAY REPEATER.
Receive
antenna
Receiver
Isolator
repeater
Transmit
antenna
Transmitter
repeater station See AUTOMATIC REPEATER
STATION and REPEATER.
repeating decimal A decimal fraction in which
groups of digits recur endlessly (e.g., 25/99 =
0.252525. . .).
repeller An electrode, especially in a velocity-modulated
tube, for reversing the direction of an electron
beam.
repertoire The instruction set for a particular object
or source computer programming language.
repetition instruction In a loop in a computer
program, an instruction that causes the repetitive
implementation of one or more instructions.
repetitive phenomenon See RECURRENT PHE-
NOMENON.
repetitive sweep See RECURRENT SWEEP.
replication In an electronic system, especially in a
computer, the redundancy of hardware units to
provide standby facilities in case of failure.
replacement A component or circuit that can be
substituted directly for another; it fits exactly into
place and functions exactly like the component it
replaces, without modification to the equipment.