In drying coal to be used as fuel for a coal-fired boiler, the coal is dried at a temperature of 80 to 150 C. The system utilizes a media management application that manages, controls andor renders digital media files in the network. The biological fluid sample is then contacted with NADPH and nitro blue tetrazolium wherein S-nitrosothiols in the biological fluid sample facilitate the reduction of NBT to NBT formazan or diformazan in the presence of paraformaldehyde. The results of the determination are used to ascertain whether or not the control function should be performed. The first and second concentration gradient portions have gradients of concentrations of nickel, manganese, and cobalt in the direction from the center to the surface, and the first concentration maintained portion has constant concentrations of nickel, manganese, and cobalt between the first concentration gradient portion and the second concentration gradient portion. The yield rate is displayed as a gauge on the user interface of the printer.