TY JOUR TI UPGRADING OF HEAVY HIGH-VISCOSITY OIL IN THE PRESENCE OF KAOLIN, NICKEL OXIDE, AND POLYOLEFINS KW HEAVY HIGH-VISCOSITY OIL KW OIL UPGRADING KW RESINOUS-ASPHALTENE SUBSTANCES KW ASPHALTENES KW LOW-TEMPERATURE CRACKING KW KAOLINITE KW NICKEL OXIDES KW ALUMINUM OXIDES JO Herald of Technological University AU Shayhutdinov, B.A. AU Antonova, M.Y. AU Prokof'eva, L.S. AU , .. AU Zayceva, E.G. AU , .. PY 2026 IS 28 PB Kazan National Research Technological University