quenching


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Related to quenching: tempering, quenching oil

quenching

[′kwench·iŋ]
(atomic physics)
Phenomenon in which a very strong electric field, such as a crystal field, causes the orbit of an electron in an atom to precess rapidly so that the average magnetic moment associated with its orbital angular momentum is reduced to zero.
(electronics)
The process of terminating a discharge in a gas-filled radiation-counter tube by inhibiting reignition.
Reduction of the intensity of resonance radiation resulting from deexcitation of atoms, which would otherwise have emitted this radiation, in collisions with electrons or other atoms in a gas.
(engineering)
Shock cooling by immersing liquid or molten material into a cooling medium (liquid or gas); used in metallurgy, plastics forming, and petroleum refining.
(immunology)
An adaptation of immunofluorescence that uses two fluorochromes, one of which absorbs light emitted by the other; one fluorochrome labels that antigen, another the antibody, and the antigen-antibody complexes retain both; the initially emitted light is absorbed and so quenched by the second compound.
(mechanical engineering)
Rapid removal of excess heat from the combustion chamber of an automotive engine.
(solid-state physics)
Reduction in the intensity of sensitized luminescence radiation when energy migrating through a crystal by resonant transfer is dissipated in crystal defects or impurities rather than being reemitted as radiation.
References in periodicals archive ?
Figure 5 illustrates three cooling curves during quenching.
If annealing is the required heat treating process, the load is placed on the transfer car and the quenching process is by-passed.
There are two cooling conditions including air cooling from exit position to quenching region and water cooling during online quenching of profiles.
Fluoranthene tracer was selected to investigate the fluorescence quenching in solution and in TSE because the UV light source for the fluorescence measurement system installed at the die has the highest radiation intensity at 365 nm at which fluoranthene is excited and emits the strongest fluorescence emission.
After intercritic quenching, samples were tested for universal hardness on a SHIMATZU dynamic ultra-micro hardness tester DUH-211S.
The Nitrofreeze[R] Uphill Quenching Process eliminates the resident residual stresses in the raw cast or forged aluminum block as well those that are created during CNC machining operations," he added.
To evaluate the effects of intrinsic (natural) fluorescence and quenching as confounding variables in fluorescence-based enzyme inhibition assays of natural products, we measured the fluorescence and quenching properties of 25 components of popular herbal products.
Experts from the Department of Food Science at the University of California recently tested 18 beers in an attempt to define what properties made the beers "thirst quenching.
Quenching moisturisers act like an all-day sprinkling system, so instead of looking dry and withered within hours, you stay supple, plumptious and blooming.
But the luminescent and quenching aspects still hold.
To accomplish these structural changes in tool steels, four primary heat treating steps are used: preheating, austenitizing, quenching, and tempering.