quenching


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Related to quenching: tempering, quenching oil

quenching

 [kwench´ing]
extinguishing, suppressing, or diminishing a physical property, as the rapid chilling of a hot metal by plunging it into cold liquid. The term is frequently used to describe decrease of fluorescence from an excited molecule by other molecules that absorb some of the energy, which would otherwise be emitted as light. In several specific applications, it is used in liquid scintillation counting to denote any process that results in a decrease in number or intensity of the light flashes produced, thus lowering the amount of energy recorded, and it is also used to describe the termination of secondary and subsequent ionizations in a detector to give the detector time to become sensitive again.

quench·ing

(kwench'ing),
1. The process of extinguishing, removing, or diminishing a physical property such as heat or light, for example, rapidly cooling a hot metal rapidly by plunging it into water or oil.
2. In beta liquid scintillation counting, the shifting of the energy spectrum from a true to a lower energy; it is caused by a variety of interfering materials in the counting solution, including foreign chemicals and coloring agents.
3. The process of stopping a chemical or enzymatic reaction.
[M. E. quenchen, fr. O.E. ācwencan]

quenching

/quench·ing/ (kwench´ing)
1. suppressing or diminishing a physical property, as of heat in a metal by immersion in cold liquid.
2. decrease of fluorescence from an excited molecule by other molecules that absorb some emission energy that would otherwise occur as light.
3. in liquid scintillation counting, interference with fluoresence generation or propagation, decreasing the counting efficiency.
4. the termination of secondary and subsequent ionizations in a detector to give it time to become sensitive again.

quenching

[kwen′ching]
1 a process of removing or reducing an energy source, such as heat or light.
2 stopping or diminishing a chemical or enzymatic reaction.
3 decreasing counting efficiency in beta liquid scintillation caused by interfering materials.
4 preventing emission of light from fluorescent compounds.

quench·ing

(kwench'ing)
1. The process of extinguishing, removing, or diminishing a physical property such as heat or light.
2. In beta liquid scintillation counting, the shifting of the energy spectrum from a true to a lower energy; it is caused by a variety of interfering materials in the counting solution.
3. The process of stopping a chemical or enzymatic reaction.
[M. E. quenchen, fr. O.E. ācwencan]

quenching,

n in aromatherapy, an aspect of synergetic combinations of oils in which undesired results arising from one component are neutralized by another component.

quench·ing

(kwench'ing)
1. The process of extinguishing, removing, or diminishing a physical property such as heat or light.
2. Process of stopping a chemical reaction.
[M. E. quenchen, fr. O.E. ācwencan]
References in classic literature ?
He snatched up the bottle, which still contained a glassful of beer, and gulped it down with relish, as though quenching a flame in his breast.
Tenders are invited for Manufacture_ Fabrication, Testing, Inspection And Delivery Of Quenching Pumps Sump Pumps With Motors On F.
Large castings cool slower during quenching and require more alloying than small castings.
Tenders are invited for Manufacture / fabrication, testing, inspection and delivery of Quenching Pumps & Sump Pumps with motors on F.
The water quenching system is fully automatic and is designed to fully submerge a load 15 seconds after it exits the furnace.
As part of the pilot plant, university of limerick requires a flexible, continuous- feed pyrolysis unit (together with a feedstock input system and a syngas quenching unit) for researching pyrolysis of a variety of feedstocks ranging from very moist organic biomass (such as sewage sludge, brewers grains or the solid fraction of anaerobic digestates) to drier non-organic feedstocks such as auto part residuals.
Tenders are invited for Oil Quenching Compound Additive Type.
However, it is difficult to avoid the distortion and high residual stresses across the section and length due to variations in thickness and non-uniform cooling during online quenching process.
Ramor steels are the only protection steels on the market made by direct quenching technology and can be up to six times harder than ordinary structural steel.
ELECTROCHEMILUMINESCENCE QUENCHING AT A BIPOLAR ELECTRODE: HALIDE IONS DETECTION SANJUN FAN AND CURTIS SHANNON DEPARTMENT OF CHEMISTRY AND BIOCHEMISTRY, AUBURN UNIVERSITY, AUBURN, AL, 36849.
Glezer and Permyakova (both National Academy of Sciences of Ukraine, Kiev) explain the process of rapidly quenching ferrous metals form the liquid state, melt quenching, which provides fundamentally new opportunities for producing advanced materials with unique combinations of properties.
TM] comprises two parts, an explosion vent and a quenching module.