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PI and Szeged indices are two of the most important topological indices defined in chemistry. In this study, the PI and Szeged indices of linear [n]-phenylenes and a cyclic hexagonal-square chain consisting of n mutually isomorphic hexagonal chains were computed. The PI and Szeged indices of a multiple phenylene, which is the 2-dimensional case of a phenylenic nanotube and nanotorus, were determined.

Work related to the development of metal composite materials using effect of super-deep penetration (SDP) of powder particles. Composite materials are obtained from usual casting billets. During SDP process powder particles work as needles and the fibers are formed in metal matrix under dynamic interaction between powder particles and matrix material. Researchers showed high non-uniformity of the chemical composition of the processed material. Material was doped with a high amount of alloying elements at SDP. It may explain specific mechanical and chemical properties of the structure of this new composite material.

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In series of papers, P.V. Khadikar introduced a new topological index and named it as Padmakar-Ivan (PI) Index. This index is found very useful in nano technology, particularly in making and characterizing carbon nanotubes and nanotori. In this paper the vertex PI index of V-phenylenic nanotubes and nanotori, is computed.