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Relaxation time and Relative permittivity change choice will provide an input table with dynamically changed size, where you can enter any number of Relaxation time and the corresponding Relative permittivity contribution values. In the Thermal Effects tab, you can select the Shift function type, which will be used to compute the effective relaxation times accounting for the temperature effects.
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Constant Loss Tangent option. In this case, you enter the Loss Tangent η(fc) together with the Center frequency fc. You also specify the model Bandwidth (decades) that defines a frequency interval centered at fc, in which the loss tangent will be approximately constant and equal to η(fc). You can also select the Accuracy for the approximation to be either Normal (default) or High. The software will automatically deduce the necessary number of Debye poles together with the values of the corresponding relaxation times and relative permittivity contributions, which will be used in computations to maintain the requested bandwidth and accuracy.
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In Eigenfrequency study and Time Dependent study, each pole will require one extra vector degree of freedom (domain variable) to represent the corresponding contribution to the polarization. Thus, using many poles in the relaxation data input table, or setting the Accuracy to High accuracy in case of Constant Loss Tangent, can lead to significant computation costs for larger models.
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When the default, None, is kept, the shift function aT(T) is set to unity and the relaxation time is not modified.
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For Vogel-Fulcher enter values or expressions for these properties:
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Activation energy Q. The default is 8000 J/mol.
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For Arrhenius enter values or expressions for these properties:
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For Williams-Landel-Ferry enter values or expressions for these properties:
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For Tool-Narayanaswamy-Moynihan enter values or expressions for these properties:
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) and select Discretization from the Show More Options dialog box. Select the element order from the list box for the auxiliary electric field vector variables en.