1. Electronics and Computer Technologies Department, Ivan Franko Lviv National University, Lviv, Ukraine;
2. Chemistry Department, Ivan Franko Lviv National University, Lviv, Ukraine;
3. Institute of Materials Engineering, Kazimierz Wielki University, Bydgoszcz, Poland;
4. General Technical Subjects Department, Stepan Gzhytskyi Lviv National University of Veterinary Medicine and Biotechnologies, Lviv, Ukraine