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This means that the time constant is the time elapsed after 63% of V max has been reached Setting for t = for the fall sets V(t) equal to 0.37V max, meaning that the time constant is the time elapsed after it has fallen to 37% of V max. The larger a time constant is, the slower the rise or fall of the potential of a neuron.
It is the time required to charge the capacitor, through the resistor, from an initial charge voltage of zero to approximately 63.2% of the value of an applied DC voltage, or to discharge the capacitor through the same resistor to approximately 36.8% of its initial charge voltage.
i.e. the magnetization recovers to 63% of its equilibrium value after one time constant T 1. In the inversion recovery experiment, commonly used to measure T 1 values, the initial magnetization is inverted, M z ( 0 ) = − M z , e q {\displaystyle M_{z}(0)=-M_{z,\mathrm {eq} }} , and so the recovery follows
The time constant τ is the e −1 -life, the time until only 1/e remains, about 36.8%, rather than the 50% in the half-life of a radionuclide. Thus, τ is longer than t 1/2. The following equation can be shown to be valid:
It is characterized by the spin–spin relaxation time, known as T 2, a time constant characterizing the signal decay. [1] [2] [3] It is named in contrast to T 1, ...
The reason for this is that the choice of a system of units may arbitrarily select any physical constant as its basis, making the question of which constant is undergoing change an artefact of the choice of units. [5] [6] [7] For example, in SI units, the speed of light has been given a defined value in 1983. Thus, it was meaningful to ...
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The stimulus is automatically decreased in steps of a set percentage until the response falls below the target (generation of an action potential). Thereafter, the stimulus is stepped up or down depending on whether the previous response was lesser or greater than the target response until a resting (or control) threshold has been established.