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Twinkling; emission of sparks or quick flashes; shimmer.

Related Terms

POISON

A material which reduces the emission of electrons from the surface of a cathode.

PHOTOELECTRIC CONSTANT

The ratio of the frequency of radiation causing emission of photoelectrons to the voltage corresponding to the energy absorbed by a photoelectron; equal to Planck's constant divided by the electron charge.

PHOTOELECTRIC

Pertaining to the electrical effects of light, such as the emission of electrons, generation of voltage, or a change in resistance when exposed to light.

LESLIE CUBE

A metal box, with faces having different surface finishes, in which water is heated and next to which a thermopile is placed in order to compare the heat emission properties of different surfaces.

INFRARED-EMITTING DIODE

A light-emitting diode that has maximum emission in the near-infrared region, typically at 0.9 micrometer.

HOLLANDFORMULA

Aformulausedtocalculate the height of a plume formed by pollutants emitted from a stack in terms of the diameter of the stack exit, the exit velocity and heat emission rate of the stack, and the mean wind speed.

CATALYTIC CONVERTER

An integral part of vehicle emission control systems since 1975. Oxidizing converters remove hydrocarbons and carbon monoxide (CO) from exhaust gases, while reducing converters control nitrogen oxide (NOx) emissions. Both use noble metal (platinum, palladium or rhodium) catalysts that can be 'poisoned' by lead compounds in the fuel or lubricant.

POSITIVE CRANKCASE VENTILATION (PCV)

System for removing blow-by gases from the crankcase and returning them through the intake manifold to the combustion chamber where the recirculated hydrocarbons are burned. A PCV valve controls the flow of gases from the crankcase to reduce hydrocarbon emissions.

INCANDESCENCE

Emission of light due to high temperature. Any other emission of light is called LUMINESCENCE.

TECHNICAL FILE

A record containing all details of parameters, including components and settings of an engine, which may influence the NOx emission of the engine.

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