Abstract: Densities of water vapor can be detected and quantified at a high sampling rate for a gas. The gas can be contained within a sample chamber within or outside of an instrument enclosure. A first split beam passes through the enclosure and the sample chamber while a second split beam that passes only through the enclosure provides a reference that can be used to correct for ambient humidity in the instrument enclosure.

Abstract: The subject matter described herein relates to a fuel cell cartridge for providing fuel to a fuel cell. Also described are fuel delivery systems, fuel cells, and related techniques.

Abstract: An interactive media system (100) is provided for use with broadcast media wherein feedback is provided to subscribers of the system via subscriber access devices. Interactive radio mobile units are mounted within vehicles (104) or at other locations. In some embodiments, each mobile unit includes a receiver (116) for receiving radio broadcasts, a GPS system (118) for determining the location of the vehicle (104), and a wireless transmitter (120) for transmitting interactive radio control signals to a network operation center (110). While listening or viewing a media broadcast, the subscriber selects program segments of interest by pressing an interactive radio control button on the mobile unit. The program segments are, for example, individual musical selections, advertisements or the like.