List of Notations
| Ea | Activation energy |
| Kb | Boltzmann’s constant |
| R(t) | Survival function or probability of proper functioning or reliability |
| Rocof | Rate of occurrence of mean number of failures per unit time |
| t | Calendar time |
| T | Random variable representing the failure instants |
| Tm | Mission duration |
| Vref | Reference voltage |
| Γ | Complete Gamma function |
| θ | Temperature (°C) |
| β | Shape factor of Weibull’s law |
| η | Scale factor of Weibull’s law |
| λ(t) | Instantaneous failure rate |
| ΔT | Temperature amplitude |
 | Arithmetic mean of variable X |
 | Estimator of variable X |
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