A supported catalyst comprising a mixed metal oxide is useful for the vapor phase catalytic partial oxidation of an alkane, or a mixture of an alkane and an alkene, to an unsaturated carboxylic acid and for the vapor phase ammoxidation of an alkane, or a mixture of an alkane and an alkene, to an unsaturated nitrile. The method can include aggregating documents into clusters based on input andor output space similarity measures, and then refining the clusters based on further input andor output space similarity measures. A shut-off seal is positioned within the nozzle cavity to seal the nozzle with respect to the wall defining the shut-off cavity. The results of this comparison are used to generate a complex weight for the at least one electromagnetic pulse.