TY JOUR TI Calculation of the main parameters of the ultrasonic oscillatory system for the intensification of gas nitriding processes KW hypersonic technologies KW nitriding KW ultrasonic oscillatory system KW magnetostriction transducer KW membranous emitter JO Science intensive technologies in mechanical engineering AU Perekryostova, V.A. AU Sukhov, A.V. AU Levushkina, N.V. AU Nigmetzyanov, R.I. PY 2021 IS 2021 PB Bryansk State Technical University