Institution: | 1. Institute of Physics , Warsaw Technical University , Koszykowa, 75, 00-662 Warszawa, Poland;2. Textile Institute , Branch of Technical University of ?óAd? , Findera 32, 43-300, Bielsko-Biala, Poland;3. Institute of Physics , Warsaw Technical University , Koszykowa, 75, 00-662 Warszawa, Poland |