Abstract: A method, an apparatus, and a computer program product are provided in connection reducing jet noise from a convergent-divergent nozzle that includes a divergent section through which at least portion of an exhaust gas flows at supersonic speeds. In one example, an apparatus is equipped with one or more injection ports arranged on the divergent section of the convergent-divergent nozzle, one or more delivery pipes coupled to each of the one or more injection ports on the exterior surface side of the divergent section and operable to transport an injection gas from a source to the divergent section through the one or more injection ports, and a controller operable to control at least one parameter associated with introduction of the injection gas. In an aspect, each of the one or more injection ports provides an opening from an interior surface to an exterior surface of the divergent section.

Abstract: A carton for a cabinet unit includes a removable panel which remains in place while the carton and its contents are in transit. At the retail location, the removable panel may be removed to provide a window through which the contents of the carton may be observed so that the retail customer may inspect the color and appearance of the cabinet unit within the carton without removing the cabinet unit from the carton. The window is covered by a transparent film which is secured to the inside surface of the carton wall in the area which surrounds the removable panel. The removable panel may be returned to its original location and taped in place over the transparent film when the carton is to be moved from the retail location to another location. The carton may be constructed from a blank of double-walled corrugated paper board.