Spatially diverse signals are simultaneously demodulated and error corrected providing statistically independent data. The method can form an oxide film of Hf1-xAlxO having desired characteristics, as a gate insulation film. In a second operational mode, the controller forwards a command to an operating system in response to an actuation of the power button, and the IO chip cuts power to the computer in response to a held actuation of the power button. A second embodiment includes a conduit in the primary mandrel for injecting concrete or grout into aggregate previously deposited in the cavity. The back panel forms a back chamber sized to fit over a backpack. The second metal layer has at least a signal line crossing the rescue line to form an enlarged intersection node.