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CAROLINA UNTILA1,2, MIHAIL CARAMAN1, VALENTIN NEDEFF2,3*, NARCIS BARSAN2*, ION SANDU4,5, ALEXANDRA DANA CHITIMUS2, VASILE VALENTIN CRETU6, CLAUDIA TOMOZEI2, ANDREI VICTOR SANDU5,7 1Moldova State University, Faculty of Physics and Engineering, 60 Alexe Mateevici St., MD-2009 Chisinau, Republic of Moldova 2Vasile Alecsandri University of Bacau, Department of Environmental Engineering and Mechanical Engineering, 156, Calea Marasesti Str., 600115 Bacau, Romania 3Gheorghe Ionescu Sisesti, Academy of Agricultural and Forestry Sciences Bucharest, 6 Marasti Blvd., 011464 Bucharest, Romania 4 Alexandru Ioan Cuza University of Iasi, Arheoinvest Interdisciplinary Platform, Scientific Investigation Laboratory, 11 Carol I Blvd.,700506 Iasi, Romania 5 Romanian Inventors Forum, 3 Sf. Petru Movila Str., Bloc L11, III/3, 700089 Iasi, Romania 6 Gheorghe Asachi Technical University of Iasi, Hydrotechnical, Geodesy and Environment Faculty, 65 D. Mangeron Blvd.,700050 Iasi, Romania 7 Gheorghe Asachi Technical University of Iasi, Materials Science and Engineering Faculty, 53A D. Mangeron Blvd.,700050 Iasi, Romania