| 单词 | time constant |
| 释义 | > as lemmastime constant time constant n. Science the time taken by an exponentially varying quantity to change by a factor 1 – 1/e (approx. 0.6321) regarded as a parameter of the system in which the variation occurs; (more widely) a time taken as representative of the speed of response of a system.The concept originated in connection with the behaviour of electric circuits. ΘΚΠ the world > time > reckoning of time > [noun] > measuring time or rate of a process > time constant time constant1869 the world > matter > chemistry > physical chemistry > [noun] > systems > speed of response time constant1869 the world > matter > physics > electromagnetic radiation > electricity > circuit > [noun] > time taken to change state time constant1869 response time1911 integrating circuit1948 the world > matter > physics > electromagnetic radiation > electronics > [noun] > graphs, functions, equations, etc. static characteristic1900 Richardson equation1913 time constant1943 step function1946 1869 Ld. Rayleigh in London, Edinb. & Dublin Philos. Mag. 38 4 There is for every conducting circuit a certain time-constant which determines the rapidity of the rise or fall of currents, and which is proportional to the self-induction and conductivity of the circuit. Thus, to use Maxwell's notation,..the time-constant is L/R = τ. 1943 Electronic Engin. 15 346 The amplifier..is a standard three-stage..circuit. The time constant of the stages is 6 seconds. 1962 A. Nisbett Technique Sound Studio v. 94 The PPM is a special type of voltmeter... The BBC version has a time constant of 2·5 milliseconds; this gives 80% of full deflection in 4 milliseconds. 1993 Mycol. Res. 97 157 In a second phase with time-constants of [one] second, the released spore body swells. 2010 R. W. Rhea Discrete Oscillator Design ii. 128 The limiting behaviour of the lamp is a thermal process with a long time constant, typically 0.1 to 1 second for small lamps. < as lemmas |
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