1. Technical University of Cluj-Napoca , The Directorate of Research, Development and Innovation Management (DMCDI) , Constantin Daicoviciu St., no. 15, Cluj-Napoca, 400020, Cluj county , Romania
2. University of Warmia and Mazury in Olsztyn , Faculty of Technical Sciences , Oczapowskiego 11, 10-719 Olsztyn , Poland
3. Department of Physics, Kermanshah Branch , Islamic Azad University , Kermanshah , Iran
4. University of Craiova , Faculty of Mechanics, Department of Applied Mechanics and Civil Engineering , Calea Bucureşti St., no. 107, 200512 Craiova, Dolj county , Romania