Improving the efficiency of water membrane techniques is a research field well\nasked by both manufacturers and end-users (agricultural, domestic and industrial). Modeling\nthe membrane functioning by considering both its structure/texture and particles\ncharacteristics, can help to reach the above fixed goal. In the present work we propose to\nvalidate an analytical simplified model (submitted for publication) by using the\nspectrophotometry principal. We have compared calculus to experimental results. We have\nobserved comparable behaviors. Errors for all parameters don’t exceed 10%.
Djebel Youssef, who possesses particular characteristics in terms of geographical isolation in the high Setifian plains, contains a very important floristic diversity. Currently, its plant formations were entering a phase of intense and continuous degradation, causing great distruption of the plant cover with the regression and disappearance of vulnerable and endemic species. This degradation is mainly due to anthropic action and climatic conditions, particularly recurrent periods of drought. In order to the preserve and protect this ecosystem, spatio-temporel monitoring of vegetation transformation was applied by using of landat satellite images (TM 5 and OLI 8), forming several study scenes. Knowledge of vegetation distribution and dynamics allows detecting changes in the state of vegetation cover over a 10-years period, using remote sensing and geographic information system (SIG) data. The recorded regression was estimated at 2,21 %.