RUDN Journal of Engineering ResearchRUDN Journal of Engineering Research2312-81432312-8151Peoples’ Friendship University of Russia named after Patrice Lumumba (RUDN University)4728PersonalIn memory of Boris I. Didukh: dedicated to his 80th anniversaryBasovYuriy Klement'evichabumahadi1@gmail.comAbu Makhadi Mokhammed Ibragim-abumahadi1@gmail.com1501201315607092016Copyright © 2013,2013