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Phononic crystal (PnC) in half-space allows anisotropic propagation and band gaps for surface acoustic wave (SAW) and promise applications such as filters and reflectors. For the feasible MEMS fabrication, a PnC comprised of cylindrical holes in a SiO2 layer covering a 128°rotated Y-cut LiNbO3 substrate was applied and the acoustic modes were analyzed numerically. The band gap for SAW was indicated...
PEM fuel cell is a clean power with a wide application prospect. The water content in proton exchange membrane plays an important role on the performance of PEM fuel cell. In this paper, Performance of PEM fuel cell with the cathode up was measured under the condition of different operating parameters. Influence of the placement of cathode up on water content in proton exchange membrane is studied...
PEM fuel cell is a kind of generator with the characteristics of high efficiency and no pollution. Dynamic performance of current density distribution is important one of its parameters. In this paper, current density distribution measurement gasket and fuel cell test system were used to measure current density distribution in PEM fuel cells. Effects of fuel cell temperature and humidification temperature...
Fuel cell temperature has an important role on performance of PEM fuel cells. In this paper, current density contribution measurement gasket was used to measure local current in PEM fuel cell and transient response of fuel cell temperature on average current density and local current is studied. Experimental results show that different local current along the channel reveals different transient characteristics...
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