Dichroic dissipation factor

The AA iy) in-phase spectrum is proportional to the extent of instantaneous strain. The AA" y) quadrature spectrum represents the component of reorientation proportional to the rate of strain that is out-of-phase with the strain by jr/2. A dichroic dissipation factor AA ... 

The dichroic dissipation factor may also be defined in a way analogous to the mechanical dissipation factor tan S (eqn [29]). 

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