L. Gu1, G. Wu2, E.A. Popov3, S.B. Makarov4, G. Dong5

1,3,4 Peter the Great St. Petersburg Polytechnic University (St. Petersburg, Russia)

2 Moscow Bauman State Technical University (Moscow, Russia)

5 Tsinghua University (Beijing, China)

1 gu2.l@edu.spbstu.ru; 2 ug@student.bmstu.ru; 3 popov@spbstu.ru; 4 makarov@cee.spbstu.ru; 5 dongge@tsinghua.edu.cn