TY JOUR TI SUBSTANTIATION OF THE PARAMETERS OF VACUUM PUMPING FACILITIES WITH A PULSING ACTIVE FLOW KW vacuum KW ejector KW pulsating flow KW pulsator KW nozzle KW mixing chamber JO Vestnik of Kazan State Agrarian University AU Nafikov, I.R. AU Khusainov, R.. AU Lukmanov, R.R. AU Galiev, I.G. AU Lushnov, M.A. AU Kashapov, I.I. PY 2022 IS 17 PB Kazan state agrarian University