| Linear Modela | Non Linear Modela,b | |
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 | Accumulation | Decay | Non Linear Decay d |
Model |
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Solution | P = Pmax (1 - e-αt) | P = Pmax e-αt |
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   T0 Unperturbed delay time |
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   T1 Perturbedc delay time | > η-1T0  (η < 1) <η-1T0  (η > 1) |
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Delay time sensitivity | ≥ |η-1 - 1| |
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