1. Department of Mechanics and Fundamentals of Machinery Design, Faculty of Mechanical Engineering and Computer Science, Częstochowa University of Technology, Dąbrowskiego 73, 42-201 Częstochowa, Poland
2. Department of Physics, Faculty of Production Engineering and Materials Technology, Czestochowa University of Technology, ul. Dąbrowskiego 73, 42-201 Częstochowa, Poland