Abstract: A gas detector includes at least one gas sensing element and a calorimetric sensing material for detection of a different, potentially contaminating gas which can impair the function of the gas sensing element disposed within the detector. The sensing material provides a visual indication of the presence of the potentially contaminating gas.

Abstract: A flexible gas sensor includes a housing with a predetermined form factor, a photoacoustic gas sensing chamber, and at least one of acoustic, temperature, relative humidity or pressure sensors in combination with processing circuitry which can emulate the characteristic gas response output of a catalytic bead pellistor-type gas sensor in response to a selected gas. The processing circuitry can include a programmable processor and a storage unit. The storage unit can be loaded with data and executable instructions to specify, at least in part, how the signals from the photoacoustic sensor are to be processed by the processing circuitry.

Abstract: A gas detector includes at least one gas sensing element and a calorimetric sensing material for detection of a different, potentially contaminating gas which can impair the function of the gas sensing element disposed within the detector. The sensing material provides a visual indication of the presence of the potentially contaminating gas.

Abstract: A highly flexible base station architecture provides extremely flexible sectorization and capacity expansion capabilities. A base transceiver station (BTS) appliance can be interfaced with similar modules to form a higher capacity, sectorized configuration. Each BTS appliance can function as a standalone cell. In addition, multiple BTS appliances can be connected together to create a multi-sector base station in which the BTS appliances share baseband data, facilitating softer handoff. A backhaul interface module concentrates the backhaul and supports distribution and routing of packets from the network to co-located BTS appliances.