TY JOUR TI INVESTIGATION OF THE KINETICS AND MECHANISM OF THERMAL DEGRADATION OF EGGSHELLS AS A POTENTIAL RAW MATERIAL RESOURCE KW eggshell KW calcination KW synchronous thermal analysis KW thermogravimetric curves KW differential scanning calorimetry JO Problems of risk management in the technosphere AU Budykina, T.A. AU Sokolov, L.I. AU Smirnova, I.M. PY 2026 IS 2025 PB Saint-Petersburg University of State Fire Service of Emercom of Russia