quench

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quench

An MRI term for a loss of superconductivity, an event that can only occur in superconducting magnets and results in total magnet failure. It is characterised by a rapid rise in magnet resistivity, which generates enough heat to evaporate the magnet coolant (liquid helium), creating a hazard that requires emergency venting to protect patients and operators.
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References in periodicals archive ?
(28) reported that the intrinsic fluorescence of protein is mainly contributed by the Trp residue alone, the Phe residue has a very low quantum yield and the fluorescence of Tyr is almost totally quenched when it is ionized.
This probability is equal to the fraction W of the excited fluorophore molecules that are quenched by collisions.
Compared with the fluorescence quenching of anthracene by MAH ([K.sub.sv], = 87L/mol) (6), fluoranthene is more quenched by MAH due to its longer lifetime of around 50 ns (16) compared with 6 ns for anthracene.
The density of generated FE mesh is considerably higher along quenched surfaces (Fig.
Four of the 25 compounds evaluated in this study fluoresced or quenched sufficiently to confound the fluo rescence-based screening assays used in this study.
As soon as tool steels have been quenched to about 125/150F, they should be immediately tempered.
In Figure 1, the quenched PD3 rail sample has the maximum hardness and the hot-rolled U71Mn rail sample has the minimum hardness before the test.
For example, quenched martensite in the carburized surface contains more carbon compared to the deeper volumes; therefore, surface martensite has bigger comparative volume and is formed from the smaller plates.
They showed that fluorescence emission is more quenched by trinitrotoluene (TNT) than by dinitrotoluene (DNT) in chloroform solution.
When austempering, components are quenched from the austenitizing temperature to a temperature above the martensite start temperature (M) and then held for a time sufficient to form the desired microstructure (ausferrite).

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