A method for production of an extruded, polystyrene-based foam plate wherein a polystyrene-based resin is heated and kneaded together with a blowing agent, a flame retardant and a nucleating agent in an extruder to obtain a foamable molten composition, and the foamable molten composition is extruded through a die attached to an end of the extruder into a lower pressure zone. In some embodiments the combustion process includes a backward-propagating detonation wave within a substantially closed channel which compresses discrete quantities of combustible and noncombustible mixture. The semiconductor device further includes a body region disposed in a portion of the semiconductor substrate between the first ridge and the second ridge, and a gate electrode adjacent to the body region. A first transistor has a current path connected between the first terminal and a reference terminal and has a control terminal connected to the second terminal. The actuator moves the print head assembly relative to the print medium in a predetermined direction. A set of olfactory cohorts is generated using the attributes in the digital olfactory data.