A method and apparatus for converting AC power into DC power are disclosed, where the method includes receiving the AC power, and converting the AC power into the DC power by way of a rectification device, where the rectification device is capable of being controlled to switch on at a plurality of time instants. The invention also describes a production method for producing the diaphragm comprising the use of the chemically induced phase separation technique, and its use in alkaline electrolysis and in electrolyzers. Then, the switch S1 is subsequently turned ON, thereby, the sustain-electrode potential is clamped to the power potential at the same level as that of the scan-electrode potential. The controller determines a total number of the terminals on the basis of the number of the first response signals received within the first limited time period, thereby determining a second limited time period defining a range within which the controller receives signals respectively from the terminals of which the number is identical to the total number of the terminals. The distribution and control of contents can be performed in association with a client application that presents content and that manages keys. The first face may contact the scroll wheel.