18WuD2x

108 ceramic transducer • change record
ceramic transducer A transducer that uses a CE-
RAMIC PIEZOELEMENT to translate such parameters
as pressure and vibration into electrical
pulses.
ceramic tube A high-temperature vacuum tube
that uses a ceramic material, instead of glass, as
the envelope; the tube offers low losses at high
frequencies.
Cerenkov radiation Light emanating from a transparent
material that is traversed by charged particles,
whose speed is higher than the speed of
light through the material.
Internal
reflecting
mirror
Atomic
radiation
Visible
light
sensor
Transparent
material
Cerenkov radiation
Cerenkov rebatron device An apparatus for generating
radio-frequency energy by passing an
electron beam through a piece of dielectric having
a small aperture.
ceresin wax A yellow or white wax obtained by refining
ozocerite. Used as an insulant and sealant
against moisture. Dielectric constant, 2.5 to 2.6.
cerium Symbol, Ce. A metallic element of the rareearth
group. Atomic number, 58. Atomic weight,
140.13.
cerium metals A group of metals belonging to
the rare-earth group: cerium, lanthanum,
neodymium, praseodymium, promethium, and
samarium.
cermet An alloy of a ceramic, such as titanium
carbide, and nickel, a metal. A thin film of cermet
is used as a resistive element in some microcircuits.
Cermet is an acronym for ceramic metal.
certified tape A magnetic recording tape that has
been thoroughly checked and found to have no
flaws.
cesium Symbol, Cs. A metallic element of the alkali-metal
group. Atomic number, 55. Atomic
weight, 132.91. The oscillations of this element’s
atoms have been used as atomic time standards.
The element is used in some phototubes as the
light-sensitive material, and in some arc lamps.
cesium-vapor lamp A low-voltage arc lamp used
as an infrared source.
Cf Symbol for CALIFORNIUM.
cgs Abbreviation of CENTIMETER-GRAM-SECOND.
chad The punched-out particle(s) constituting refuse
from paper-tape punching.
chadded tape Punched paper tape in which the
chad is left partially attached to the tape’s
punched holes.
chadless tape Punched paper tape without CHAD.
chafe 1. An area that has been abraded by rubbing
or scraping. 2. To produce a chafe.
chaff Strips of metal foil used to create radar interference
or ambiguity in locating a target by multiple
reflections of the beam. Also called MIRROR.
chain broadcasting Simultaneous transmissions
from a number of broadcast transmitters connected
together in a network by wire line, coaxial
cable, or microwave link.
chain calculation As performed by a calculator, a
calculation that can be entered as it would normally
be written (i.e., without the need for regrouping
operands).
chain printer In the readout channel of a digital
computer, a high-speed printer carrying printer’s
type on a revolving chain.
chain radar system A number of radar stations
along a missile-flight path that are connected in a
communications or control network.
chain reaction A reaction (as in nuclear fission)
that is self-sustaining or self-repeating. Unless
controlled from outside, such a reaction runs to
destruction.
chain switch A switch that is actuated by pulling a
light metal chain. Successive pulls turn the
switch alternatively on and off.
Chain
Cord
chain switch
change dump In computer operation (especially in
debugging), the display of the names of locations
that have changed following a specific event.
change file See TRANSACTION FILE.
change of control In a sequence of computer
records being processed, a logical break that initiates
a predetermined action, after which processing
continues.
changer In a high-fidelity disk player, a device that
allows several disks to be played, one after the
other, without the need for manually exchanging
the disks.
change record A computer record that changes information
in a related master record. Also called
transaction record.