[en] The activity of precious meta catalysts in the wet oxidation of organic compounds was investigated. Ruthenium was the most active catalyst among the precious metals examined, and cerium (IV) oxide was the most effective support. The Ru/Ce catalyst rivaled homogeneous copper catalyst, which is used in the practical wastewater treatment, for the oxidation of n-propyl alcohol, n-butyl alcohol, phenol, acetamide, poly (propylene glycol), and acetic acid. In addition, it was especially effective for the oxidation of some compounds with high oxygen content such as poly (ethylene glycol), ethylene glycol, formaldehyde, and formic acid

[en] A classical model that describes a system of conserved scalar nucleons interacting with neutral scalar mesons is considered. The dynamics of these fields are coupled through the Yukawa interaction. In the case of relativistic fields, that is, when nucleons are described by Dirac spinor fields, the coupled Klein-Gordon-Dirac equations are encountered. Both Klein-Gordon-Dirac equations and Klein-Gordon-Schroedinger equations have energy forms indefinite in nature. The initial-boundary value problem for the coupled Klein-Gordon-Schroedinger equations in three space dimensions is discussed here. The purpose is to establish the existence and uniqueness theorems of global C/sup x/-solutions of the initial-boundary value problem. The main difficulties lie in the proof of the existence of strong solutions and their regularity properties