[1] Doctoral School of Materials Science and Engineering, National University of Science and Technology POLITEHNICA Bucharest, Splaiul Independenței nr. 313, Sector 6, Bucureşti,060042, Romania
[2] Institute for Nuclear Research, Câmpului Street nr. 1, Mioveni,115400, Romania
[3] Faculty of Engineering, ANSBACH University of Applied Sciences, Residenzstraße 8, Ansbach,91522, Germany
[4] Technical Sciences Academy of Romania, Calea Victoriei nr. 118, Sector 1, Bucuresti,010093, Romania