A downhole acoustic logging tool is used for generating a guided borehole wave that propagates into the formation as a body wave, reflects from an interface and is converted back into a guided borehole wave. License information containing the identification information and launching program information of the apparatus is acquired from a PC via the communication unit. Such nitrogen oxides contained in the combustion gases are initially catalytically oxidized to at least about 50 vol % NO2 and some higher oxides by contact with the bi-functional catalyst at 170-550\xb0 F. The second semiconductor layer is buried in an epitaxial layer grown above a substrate. The feather crown portion is designed for stabilizing the body member when the body member is flying through the air.