Abstract: A gas generating system comprises an air separation module (ASM) in fluid communication with a nitrogen enriched air (NEA) line and an oxygen enriched air (OEA) line. A valve is positioned in the OEA line and an oxygen sensor is positioned in the NEA line. The valve can be modulated in response to the oxygen sensor to create a backpressure forcing more airflow into the NEA line. The OEA line can be backpressured until a predetermined NEA oxygen concentration is reached.

Abstract: A gas generating system comprises an air separation module (ASM) in fluid communication with a nitrogen enriched air (NEA) line and an oxygen enriched air (OEA) line. A valve is positioned in the OEA line and an oxygen sensor is positioned in the NEA line. The valve can be modulated in response to the oxygen sensor to create a backpressure forcing more airflow into the NEA line. The OEA line can be backpressured until a predetermined NEA oxygen concentration is reached.

Abstract: The combination scooter/backpack is an article carrying device with the capacity to be converted into a wheeled land vehicle, and therefore has two modes of usage. The article carrying device resembles a conventional backpack with two straps positioned to be placed over the user's shoulders, entitled backpack mode. The wheeled land vehicle functions as a popular collapsible scooter, two wheels mounted upon a board member with propulsion means provided by user's contact with the ground, entitled scooter mode. A horizontal handlebar is positioned at the top of the combination and serves to steer the front wheel during scooter mode. Conversion between backpack mode and scooter mode is accomplished with the raising and lowering of said handlebar and the manipulation of releasable fasteners and latches. In both backpack and scooter modes, a cover circumferentially surrounds the combination scooter/backpack to secure and protect components that are not in use.