A printing unit cylinder is subject to only low deformation in the event of operationally induced increases in the temperature of the printing unit. The procedure determines whether or not the transfer of the image files is allowable on the basis of the result of comparison. Therefore, the semiconductor memory device can ensure the stability of the write or read operation. In variations, the operating system is circumvented while the information from each of the plurality of files is retrieved. The process provides a methane conversion of 28-95% with H2 to CO mole ratio of 1. The ridge waveguide is formed of a conductive sidewall-from metallic materials and may be in the form of a hollow tube, such as a rectangular hollow tube or a circular hollow tube, for example.