Abstract: An air guidance control unit having a frame, which surrounds at least one air opening for air flowing along an air flow direction to flow through, a closing device including adjustable flaps, which closing device can be adjusted by means of an adjusting element between an open position in which the air opening is exposed and a closed position in which the air opening is at least partly closed. The invention devises various solutions for especially compact and reliable flap arrangements.

Abstract: Air flow control insertable into an air opening for controlling air flowing along an air flow direction, with a closure device including a cloth or fabric adjustable between an opening position releasing the air opening and a closing position at least partially closing the air opening by means of an adjustment device for selectively releasing and closing the air opening to change the air resistance and/or for thermal management of a downstream unit in the air flow direction. Various solutions are proposed to integrate the air control system in or behind an air grille, especially in very limited installation space.

Abstract: Electrically conductive meshes with pore sizes between about 20 and 3000 nanometers and with appropriately selected strand geometry can be used as engineered supports in electrodes to provide for improved performance in solid polymer electrolyte fuel cells. Suitable electrode geometries have essentially straight, parallel pores of engineered size. When used as a cathode, such electrodes can be expected to provide a substantial improvement in output voltage at a given current.