A.L. Gelgor – Ph.D.(Eng.), Associate Professor, Higher School of Applied Physics and Space Technologies  of Peter The Great St. Petersburg Polytechnic University

E-mail: A_Gelgor@mail.ru

T.E. Gelgor – Senior Lecturer, Department «Experimental Physics», 

Peter The Great St. Petersburg Polytechnic University

E-mail: tanya.gelgor@yandex.ru