“threshold”的概念、定义、翻译、参考文献-科学参考

单词	threshold
释义	threshold [`thresh´hōld] ^{BUILDING CONSTRUCTION} A piece of stone, wood, or metal that lies under an outside door. ^ELECTRONICS In a modulation system, the smallest value of carrier- to-noise ratio at the input to the demodulator for all values above which a small percentage change in the input carrier-to-noise ratio produces a substantially equal or smaller percentage change in the output signal-to-noise ratio. ^ENGINEERING The least value of a current, voltage, or other quantity that produces the minimum detectable response in an instrument or system. ^GEOLOGY See <<riegel>> ^MATHEMATICS A logic operator such that, if P, Q, R, S, ... are statements, then the threshold will be true if at least N statements are true, false otherwise. ^PHYSICS The minimum level of some input quantity needed for some process to take place, such as a threshold energy for a reaction, or the minimum level of pumping at which a laser can go into self-excited oscillation. ^PHYSIOLOGY The minimum level of a stimulus that will evoke a response in an irritable tissue.
随便看	retrograde wave retrograding shoreline retrogression retrogressive metamorphism retrolental fibroplasia retroposon retroreflection retroreflector retrorocket retrorse retrostalsis retrosynthetic analysis retroussage retroversion retrovirus retry retting return return address return bead return bend return busy tone return code return connecting rod return difference

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