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Proton Exchange Membrane Fuel Cell (PEMFC) is a promising power generation device, so it is very meaningful to assess the health state of the PEMFC in application. This paper proposes a method to evaluate the PEMFC health state based on a geometrical approach and Mahalanobis Distance (MD). Firstly, geometry features are extracted from electrochemical impedance spectroscopy (EIS) and polarization curve...
Insulation system of power transformers endures power frequency alternating voltage as well as switching impulse voltage and lightning impulse voltage, which may bring potential risk to the insulation system. Therefore, it is of great necessity and importance to study the influence of lightning impulse on the oil-paper insulation system. In this paper, the accumulative effect of multiple negative...
Mg 92 Zn 6 Y 1.5 Zr 0.5 alloy was extruded at 300, 350, 400°C and then aged at 180°C. In the extruded alloy, polygon- and bar-shaped precipitates were observed. The precipitates were identified as I-phase (Mg 3 Zn 6 Y) and W-phase (Mg 3 Zn 3 Y 2 ) respectively by selected area diffraction (SAD) pattern. These precipitates played...
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