A dual shaft and rotating machine coupling has a first rotatable shaft, a second rotatable shaft and a rotating machine rotor coupling. A combined model for predictive optimization or control of a nonlinear process includes a nonlinear approximator, coupled to a parameterized dynamic or static model, operable to model the nonlinear process. The method further comprises determining whether the query object is configured to provide one or more valid values for the field. The receiving container has a bottom and sidewalls each extended from the bottom and facing corresponding one of the side surfaces of the light guide unit, for receiving the first lamp unit and light guide unit.