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Hedia Chakroun Goze B. Benie Norman T. O'Neill Jacques Desilets 《International journal of geographical information science》2013,27(4):319-336
Data layers that represent geographical constraints in a multidimensional GIS model must be appropriately weighted to effectively account for the diversity as well as the functional and spatial interrelationships between the constraints. This paper presents a spatial analysis weighting algorithm (SAWA) using Voronoi diagrams. The basic functions of the SAWA are defined so that the spatialization of weights is done according to two approaches: a global spatialization method based on the statistical distribution of the original data and a contextual approach where neighbourhood defined by Voronoi diagrams is integrated into the weighting functions. Different simulations on artificial and real maps applied to the problem of shortest path optimisation are analysed. The results show that the effective integration of the spatial dimension in a weighting process is not only possible but also improves the optimisation of shortest paths. Research is continuing to improve the contextual phase of the algorithm. 相似文献
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Salima Chakroun Wafa Mechti Mongi Herchi Mohamed Essghaier Gaied 《Arabian Journal of Geosciences》2018,11(3):60
Three mixtures (M1, M2, and M3) of the Eocene clay deposits were collected from Ain M’Dheker (Enfidha, Tunisia). These mixtures have been treated by hydrochloric acid in order to improve their physico-chemical characteristics. Optimum conditions for activation were conducted by varying several parameters such as the acid concentration, time, and temperature activation. The activation condition effect on surface area is studied. A representative raw (M3) and activated (AM3) mixtures were used in industrial application: Sunflower oil and Black 194 dyes (textile waste). M3 and AM3 were used to leach sunflower oil by varying the clay amount introduced. Results of the bleaching power of used samples were compared to that found by commercial bentonite imported from Germany (Tonsil), having a surface area of 725 m2/g. Indeed, an amount of 1% of AM3 gives a 60% decolorization similar to that found by commercial clay. Also, the ability of raw and activated clay to remove the dye (Acid Black 194) from effluent has been studied firstly at different pH and in second time by varying the adsorbent amount. Then, an amount of 0.025 g is sufficient to give a higher adsorption capacity for M3 than AM3. Consequently, Ain M’Dheker clay deposits can be use in other environmental application even without any treatment. 相似文献
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Amel Chakroun Dalila Zaghbib-Turki Mohamed Moncef Turki 《Arabian Journal of Geosciences》2016,9(4):327
Detailed observation of the Upper Pleistocene deposits of Rafraf (Bizerte, Northeastern Tunisia) provides new data about the significant variations in facies, thickness, and faunal assemblages. This work reports, for the first time, the occurrence of a Persististrombus latus level in the Rafraf sea coast. Facies analyses added to the recorded sedimentary features were carried in order to recognize stratigraphy, paleontology, and sea level highstands. They revealed complex succession of various Upper Pleistocene environments ranging from coastal dunes to inner platforms with scatter builds by Vermetus triquetrus and P. latus. The marine Upper Pleistocene deposits rich in the Senegalese fauna P. latus draw scale steps outcropping at diverse altitudes varying between 1 and 14 m. Serial sections along the border of the Rafraf beach show the action of many faults trending EW and NW-SE. Even though these faults got low values of vertical throw, their cumulative throw values led to these different altitudes of strata containing P. latus. These altitude variations are mainly the result of the inherited geomorphology, the environmental distribution, the sea level fluctuations and the tectonic activities. 相似文献
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