A method of recovering halogen-containing materials from the cyclic catalyst regeneration operation of a catalytic hydrocarbon conversion process is disclosed. In one example, a continuous-time amplifier is implemented by applying the input source across the input and the output terminals of the buffer amplifier. Upon identifying at least one of the service requester processes as contributing to the congestion, execution of the at least one of the service requester processes is slowed. The radiator has an overlapping portion between the downtubes that overlaps the downtubes as viewed from laterally of the motorcycle.