A method for preparing ceramic powders in the presence of a carbon powder including a step which consists in homogenizing a mixture of particles capable of resulting in a ceramic by heat treatment. Supported transition metal catalysts are prepared and used for this reaction with high activity. The curable composition exhibits excellent light extraction efficiency, hardness, thermal and shock resistance, moisture resistance, gas permeability and adhesiveness, after curing. A set of instructions executed by the processor loads the boot image from one of the boot devices selected by the selector into the main memory.