An improved convectionimpingement oven for continuously cooking food. A piezoelectricelectrostrictive device has a laminated structure in which an electrode film, a piezoelectricelectrostrictive film, an electrode film, an piezoelectricelectrostrictive film, and an electrode film are laminated in the order mentioned on a thin portion of a substrate. A first spindle is rotated by a second motor independent of rotation of the base, is positioned coaxially with the pivotal center, and one end of a first arm is attached to the first spindle. The control module collects and processes sensor output, and provides a control signal to at least one controllable device. Valuable metals can be recovered from catalyst particles for subsequent re-use in a catalyst synthesis unit, generating a fresh slurry catalyst.