A door in sections that can be folded back or can be moved apart by sliding.


Related Terms

PEEL TEST

A test to ascertain the adhesive strength of bonded strips of metals by peeling or pulling the metal strips back and recording the adherence values.

OPTICAL AMPLIFIER

An optoelectronic amplifier in which the electric input signal is converted to light, amplified as light, then converted back to an electric signal for the output.

NUTATING-DISK METER

An instrument for measuring flow of a liquid in which liquid passing through a chamber causes a disk to nutate, or roll back and forth, and the total number of rolls is mechanically counted.

NEGATIVE FEEDBACK

Feedback in which a portion of the output of a circuit, device, or machine is fed back 180 out of phase with the input signal, resulting in a decrease of amplification so as to stabilize the amplification with respect to time or frequency, and a reduction in distortion and noise. Also known as inverse feedback; reverse feedback; stabilized feedback.

MOVABLE PLATEN

The large platen at the back of an injection-molding machine to which the back half of the mold is fastened.

KRIGAR-MENZEL LAW

A generalization of the second Young-Helmholtz law which states that when a string is bowed at a point which is at a distance of p/q times the string's length from one of the ends, where p and q are relative primes, then the string moves back and forth with two constant velocities, one of which is q 1 times as large as the other.

IONOSONDE

A radar system for determining the vertical height at which the ionosphere reflects signals back to earth at various frequencies; a pulsed vertical beam is swept periodically through a frequency range from 0.5 to 20 megahertz, and the variation of echo return time with frequency is photographically recorded.

INFINITE BAFFLE

[ENG ACOUS] A loudspeaker baffle which prevents interaction between the front and back radiation of the loudspeaker.

ACID RAIN

The acidification of rain (largely resulting from atmospheric pollution from burning sulphur rich coal) causing forest die back and reduction of quality of water habitats.

BACK FLOODING

Occurs when fluid passes in reverse through a pump or valve back into the fluid reservoir or compartment.

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