In dielectric

piezoelectric and pyroelectric effects

fast effect is yielded by the primary structure and slow effect is yielded by the secondary and tertiary structures in dielectrics.Using the method of composite ensemble

the residual polarization of slow effect is explained.The theoretical curve of frozen polarization in electrets is calculated

and is in agreement with the experiment.Slow polarization is a non Markovian process.Because of it’s recording history effect

the source equation must be added in electrodynamics besides Maxwell’s field equations.In linear response of polarization

the sufficient and necessary condition of existing a complex dielectric constant is that the process of polarization is Markovian.In β transition of polymers

the coefficient of restoring forces for the motion of secondary and tertiary structure parabolic softens with a parabolic type.