A fixing device includes: a pressure belt movable in a revolving motion; a fixing roller; and a pressure member for pressing an inner surface of the belt toward the roller. The method, software and system can combine quick response code with more custom mobile device uniform resource locator scheme to seamlessly invoke mobile application that enable an end user to perform strong, multi-factor authentication as a component of completing a transaction. Also, a housing includes an outer objective housing, and a tubular housing. The side-by-side arrangement of the turbojet and SCRAMjet engines reduces the vertical thickness of the aircraft, thereby reducing drag and potentially increasing performance.