One embodiment of a system of the present disclosure, among others, can be implemented as follows. Second, the unit exerts a cyclonic motion on the product gas causing outward separation of particulate matter from the gas, which passes to the outlet via a path through the middle of the vessel. When a user selects a video program link to record, recording of the program is automatically scheduled, and if a conflict exists, recording of the previously-selected conflicting program is canceled. After the mold is opened, the cut-out portion of the compression area can be removed to expose the hole. The SAW device is capable of efficiently and electrically uniformizing electric charge generated by pyroelectric property of a piezoelectric substrate 1.