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significant barriers to high-performance operation of traditional PEM fuel cells at elevated temperatures, where the relative humidity may be reduced. This work reports on approaches to the development of high-temperature membranes for PEM fuel cells; composite perfluorinated sulfonic
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## Abstract Water content in the membrane and the presence of liquid water in the catalyst layers (CL) and the gas diffusion layers (GDL) play a very important role in the performance of a PEM fuel cell. To study water transport in a PEM fuel cell, a twoβphase flow mathematical model is developed.
Liquid-feed direct methanol fuel cell systems (DMFC) have a number of advantages over hydrogen fuel cells. For a DMFC no additional fuel processing is necessary, therefore, it has a lower volume and a lower weight, the existing infrastructure for fuel supply and distribution can be utilized and the
Incubation of a cell-free system from immature seeds of Cucurbita maxima Duch. with [(14)C]GA12-aldehyde derived from [(14)C]mevalonic acid in the same system yielded the C19-gibberellin, [(14)C]GA4, in addition to the C20-gibberellins, [(14)C]GA37, [(14)C]GA13 and [(14)C]GA43. (GA-gibberellin).
## Abstract A model fuel cell with a single transparent straight flow channel and segmented anode was constructed to measure the direct correlation of liquid water movement with the local currents along the flow channel. Water drops emerge through the largest pores of the GDL with the size of the d