TY JOUR TI PERSPECTIVE ANTIFRICTIONAL COVERING OF PISTONS OF INTERNAL COMBUSTION ENGINES ON THE BASIS OF NANO-POWDERS OF TUNGSTEN DICHALCOGENIDES KW internal combustion engine KW mechanical losses KW piston KW coating JO NATURAL AND MAN-MADE RISKS (PHYSICO-MATHEMATICAL AND APPLIED ASPECTS) AU Galyshev, Y.V. AU Shabanov, A.Y. AU Tolochko, O.V. AU Breki, A.D. AU Ivanovsky, D.K. PY 2015 IS 2015 PB Saint-Petersburg University of State Fire Service of Emercom of Russia