Ferroelectric capacitors are provided that include an integrated circuit substrate and a supporting insulation layer on the integrated circuit substrate having a face and a trench in the face. A pressure rotator is pressed against the endless belt to form a fixing nip therebetween. The methods also help to determine media entities that have similar, or dissimilar as a request may indicate, tempo by utilizing classification chain techniques that test distances between media entities in terms of their properties. The valve defines a spring chamber including a spring biasing the spool toward the first position. The electrical generator can operate in either voltage control mode or field duty cycle control mode, depending upon various conditions.