background: light is an important and adjustable physical factor in the job environment.this study aimed to determine the intensity of natural and mixed light and also the level of ultraviolet radiation in libraries and computer sites of ilam universities in spring 2011.   methods: in this cross-sectional study, 10 libraries, 16 study saloons, and 7 computer sites were selected. luminosity asse...

Mathematical models of street traffic allowing assessment the importance their individual segments for functionality system are considered. Based on methods cooperative games and reliability theory a suitable measure is constructed. The main goal to analyze assessing (rank) road fragments, including functions. relevance these elements effective accessibility entire will be