A field effect transistor is of the type which employs base biasing to depress the intrinsic contribution to conduction and reduce leakage current. Alternatively, a single cable may be provided which exits through a movable trolley which is fixable at different positions along the arcuate path. A vibratable ultrasonic head array is positionable within and beneath a top edge of the reactor vessel and is submergable within the reactor vessel for vibrating the disc to form an atomized fog of particles from the liquid. Specifically, the rules are serialized as annotations on the logical model.