Lately, there have been a tremendous amount of research in the field of renewable energy utilizing the fuel cell technology. This paper presents a highly reliable micro PEM fuel cell based power supply system which ca...
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ISBN:
(纸本)9781479976119
Lately, there have been a tremendous amount of research in the field of renewable energy utilizing the fuel cell technology. This paper presents a highly reliable micro PEM fuel cell based power supply system which can operate in adverse and varying ambient conditions with a comparatively lower probability of cell damage. The life of a cell is greatly affected by catalyst poisoning-caused by selective adsorption of carbon monoxide by the platinum catalyst thereby reducing the rate of cell reaction by blocking its active sites;fuel starvation - resulting from the scarcity of oxygen required for the reaction to take place;and local hotspot generation caused by the non-uniformity in membrane impedance which occurs in the course of operation. The proposed system minimizes these threats with the help of an algorithm to overcome the issue of catalyst poisoning and fuel starvation and a mitigation algorithm to minimize the effect of impedance variation. It can be then used to power up portable electronic devices like wireless sensor nodes.
This paper addresses small targets and signal processing from the perspective of rejecting radiation noise spikes. Nuclear and space radiation create noise spikes inside infrared detectors causing an overwhelming numb...
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ISBN:
(纸本)0819425850
This paper addresses small targets and signal processing from the perspective of rejecting radiation noise spikes. Nuclear and space radiation create noise spikes inside infrared detectors causing an overwhelming number of false alarms, if steps are not taken to mitigate the radiation noise spikes. Traditional radiation device/circuit hardening methods are effective, but must be reapplied to each new technology forcing special design point solutions and parts that are increasingly economically nonviable. Real-time noise mitigation algorithms represent a general hardening solution and have been demonstrated for both Interceptor Seeker and Space Surveillance sensor applications. A new combined HWIL/radiation synthetic test environment has been developed that enables real-time algorithm evaluation over the total system performance envelope, under flight motion simulation and fully dynamic optical sensor scene stimulation. This work was sponsored by the Defense Special Weapons Agency.
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