Co

0.700uj

0 10 20 30 40 50 60 OPERATION TIME/min

Figure 2 The progress of the stack's data

The controlled temperature was the same for each load. It was found that when the power source is operated in such a manner, its weight decreased in accordance with the reduction of the load. In the same manner, the concentration of the phosphoric acid increased and the volume was reduced the more the load reduced. Figure 4 shows the results when the controlled temperature is changed to maintain the same stack weight regardless of the load. The stack weight could be maintained at a relatively even level by setting the controlled temperature to

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