TY JOUR TI MATHEMATICAL MODELING OF THE ATTENUATION OF THE OSCILLATIONS IN POLYCRYSTALLINE SOLIDS KW mathematical model KW ultrasound KW attenuation KW stress-deformirovannoe condition KW strength properties KW porosity KW dislocations JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Tolstopyatov, S.. AU Golovanova, E.. PY 2016 IS 1 PB Belgorod State Technological University named after V.G. Shukhov