A configuration for a substrate for a semiconductor device which makes it possible to achieve further stabilization of the voltage for driving a semiconductor element to be mounted is provided. In another embodiment the invention is an article comprising a shaped plastic article; an expandable material coated in the shaped plastic article; and a film covering the material coated shaped plastic article. The composition may be used for an active wave guide material, such as modulator or switching device compositions. The wafer contact portions bond with the wafer support shelves without mechanical fasteners between the wafer contact portions and the wafer support shelves. Strategic positioning of the supporting stub shafts for the thin walled small corrugating roll axially outside the flute patterns provides substantially uniform small roll deflection along the nip. The magnesium mixing system may include a flow of magnesium and a flow of a carrier fluid, a carrier mixing chamber to mix the flow of magnesium and the flow of the carrier fluid to form a mixed carrier flow, and a heavy fuel oil mixing chamber to mix the flow of heavy fuel oil and the mixed carrier flow.