A dual-mode RFID reader is capable of automatically switching from a far-field interrogation mode to a near-field interrogation mode upon the detection of certain operating or handling conditions. A line-shaped element 12, which is operated in the frequency band of terrestrial digital television broadcast, is disposed in a first groove 10a of a predetermined length formed on the outer periphery of the support member 10 from the lower end thereof. Flow-diverting elements are provided, e. The adjustment eccentric has a rim encompassing the bearing journal device on an end facing away from a flange side and a passage device, through which an end region of the bearing journal device is accessible, is constructed in the region of this rim. Further, a polymer electrolyte fuel cell using the fuel cell separators is effective to exhibit a stable output without reduction in output during operation and enhance the operational efficiency. If a transition is appropriate, the control software module can apply commands to transition the microgrid module to a different operating state.