1. School of Earth Sciences and Engineering, Tomsk Polytechnic University, Lenina pr. 30, Tomsk 634050, Russia e-mail:
2. Transport, Oil and Gas Faculty, Omsk State Technical University, Mira pr. 11 Omsk, 644050, Russia; Material Engineering and Metal Technology Department, Tver State Technical University, Komsomolsky pr. 5, Tver, 170026, Russia e-mail: