1. 1 Faculty of Electrical Engineering , Bialystok University of Technology , ul. Wiejska 45D, 15-351 Białystok , Poland , phone +48 85 746 93 97, fax +48 85 746 94 00
2. 2 Faculty of Mechanical Engineering , Bialystok University of Technology , ul. Wiejska 45C, 15-351 Białystok , Poland
3. 3 Faculty of Chemistry , University of Bialystok , ul. K. Ciołkowskiego 1K, 15-245 Białystok , Poland
4. 4 Faculty of Non-Ferrous Metals , AGH University of Science and Technology in Kraków , al. A. Mickiewicza 30, 30-059 Kraków , Poland