TY JOUR TI SINGLE-BUCKET EXCAVATOR CAPACITY INCREASE THROUGH BUCKET SHAPE IMPROVEMENT KW excavator KW bucket KW capacity KW cutting KW soil JO Bulletin of Bryansk state technical university AU Buryy, G.G. AU Scherbakov, V.S. AU Poteryaev, I.K. PY 2019 IS 2019 PB Bryansk State Technical University