A power supply device for plasma processing, wherein electric arcs may occur, comprises a power supply circuit for generating a voltage across output terminals, and a first switch connected between the power supply circuit and one of the output terminals. The final boiling point of the feed stream is increased by adding a heavy essentially asphaltene-free high boiling point hydrocarbon to the feed stream before the feed stream enters the convection section of the pyrolysis furnace, whereby said fouling occurs lower in the convection section. The first moving region is adapted to zoom the zoom optical system. There is clearly a market for a device that has multirole capabilities and contains all the necessary components for surviving at sea. A cantilever bearing element is interposed between the cantilever portion and the ceiling of the habitat to support the cantilever portion against the ceiling for sliding movement.