Construct · 4 fields · 4 citations
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In metallurgy, quenching is the rapid cooling of a heated metal, usually by plunging it into water, oil, or forced gas, so that the high-temperature structure has no time to transform slowly and instead forms a hard, metastable phase such as martensite in steel. Krauss's Steels: Processing, Structure, and Performance treats how cooling rate, hardenability, and section size govern which phases appear and therefore the final hardness and residual stress. The referent here is a heat-treatment step that trades toughness for hardness by outrunning diffusion, and it has nothing in common with a dimming dye molecule or a quieting of neural noise beyond the shared image of something being suddenly stopped.[1]
In photophysics, quenching is any process that lowers the fluorescence intensity of an excited molecule, as when a collisional quencher, energy transfer, or a change in environment drains the excited state before it can emit a photon. Lakowicz's Principles of Fluorescence Spectroscopy sets out the Stern-Volmer analysis that separates dynamic (collisional) from static quenching and uses the effect to probe distances, binding, and accessibility. The referent is a photophysical loss of emission from an excited state, quantified by quenching constants, and it is a wholly different thing from cooling a hot metal or the suppression of cortical variability, joined to them only by the word's meaning of being damped down.[2]
In systems neuroscience, quenching names the widespread finding that the onset of a stimulus or movement sharply reduces the trial-to-trial variability of cortical neural activity, so that responses become more reproducible once the network is driven. Churchland and colleagues' 2010 Stimulus onset quenches neural variability: a widespread cortical phenomenon documented the effect across many cortical areas and interpreted it as the settling of network dynamics after input arrives. The referent is a reduction in neural noise locked to events, measured as a decline in across-trial variance, and it is unrelated to hardening a metal or dimming a dye, sharing only the meaning of fluctuation being suppressed.[3]
In astronomy, quenching refers to galaxies shutting down their star formation, through processes tied to their mass and environment. This meaning comes from Peng (2010) in The Astrophysical Journal.[4]
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