By Jack David
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Extra resources for Abrams Tanks
Zooming in on a specific transient provides further information. 47 Ω, is represented in the V-I plane; the marks on the line represent the sampling points. 25 Ω one, when the switch on the resistance board was turned back off. 3. 2: Experimental polarisation curve of a PBI fuel cell at 150 °C, measured with a sweep rate of 25 µV/s. The arrows indicate the direction of the hysteresis cycle. 3. 25 Ω and then switching back. 06 s. 3. 4: Zoom on an experimental transient path for a step change in the external resistance.
1. The load was a variable-resistance board, implemented with two resistances in parallel; in series with one of these resistances, a switch could be opened and closed manually, changing the total resistance of the circuit. 2. 1: The laboratory setup for the experiments. Resistances R1 and R2 can be set to 11 different values each. The fuel cell’s voltage is measured by voltmeter V1 and passed to the data-acquisition unit. Resistance Rref , known and fixed, is used to measure the current; its voltage is measured by V2 .
They also included a modelling of charge accumulation in the charge double layer, and tried to reproduce a cell’s transient behaviour with linear transfer functions for anode, cathode and membrane of a direct methanol fuel cell. Pathapati et al.  produced a model that calculated the overvoltage as in Amphlett et al. , adding the effects of transients in overvoltage and non-steady-state gas flow. A similar model, with a more detailed modelling of the overvoltage, has been proposed by Lemeš et al.
Abrams Tanks by Jack David