Temperature-dependence of structural transformation of oxidized graphite from the electro-oxidation processing of nuclear graphite matrix have been studied. Meanwhile, the mechanism of dissociation of oxygen species on the thermal reduction process has been suggested.

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A graph embedded in the 3-sphere is called irreducible if it is non-splittable and for any 2-sphere embedded in the 3-sphere that intersects the graph at one point the graph is contained in one of the 3-balls bounded by the 2-sphere. We show that irreducibility is preserved under certain deformations of embedded graphs. We show that certain embedded graphs are irreducible.