When forming sophisticated transistors, the channel region may be provided such that the gradient of the band gap energy of the channel material may result in superior charge carrier velocity. The stop method includes the steps of stopping supply of hydrogen to the anode, electrically connecting the anode and the cathode via an electrical load, and supplying air to the anode. The terminal management system updates, in response to updating of the first terminal information of a first communication terminal of the plurality of communication terminals, the second terminal information of the first communication terminal to match with the updated first terminal information. The phase shifter sequentially applies a plurality of candidate phase calibration amounts to the output voltage of the power amplifier to generate a plurality of adjusted signals with different phases in a calibration mode. In some implementations the receptacles may be stackable only when oriented correctly; in these implementations, orientation of the receptacles may be detected prior to stacking and incorrectly oriented receptacles may be either rotated to the correct orientation or diverted to a second receptacle stacker.