Browsing by Author "Ouslimani, N."

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    Water quality control of three sites at kedarra barrage
    (University of El Oued, 2021) Ghemmit-Doulache, Naima; Ouslimani, N.
    Study aim is to monitor water quality at three sites at Keddara barrage witch located on territory of Boumerdes-Algeria. Physico-chemical, bacteriological and heavy metal analyses were carried out on waters feeding barrage site A, within barrage site B and those leaving barrage corresponding to pumping waters site C. Physical qualities of all three waters largely meet WHO standards. Chemical qualities Results showed that hardness is greater at site C. A mineralization with low nitrate, chloride, phosphate and ammonium contents. DCO/DBO5 ratio < 3 (for all three sites), indicating that source of water pollution is of organic origin. Analysis results of all three samples by SAA revealed traces of heavy metals which confirm good water quality. Keddara barrage waters are charged with total coliform bacteria, enterococcus and Escherichia-coli, so these waters require bacteriological treatment.
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    Water Uptake Of Polymer/clay Nanocomposites: Model Development
    (Université M'Hamed Bougara Boumerdes, 2019) Kouini, B.; Ouslimani, N.
    Numerous models have been proposed for modeling water diffusion behavior in polymers and polymer composites. The most common approach is to apply Fick’s law to simple single-free-phase diffusion, due to its simplicity and mathematical tractability [1]. However, it has been demonstrated that diffusion of water in some glassy polymers is anomalous (non-Fickian). Two main approaches are proposed to model the anomalous diffusion. One is the Langmuir-type model for diffusion (LMD), assuming that absorbed water molecules consist of mobile and bound phases [2,3]; the other is the diffusion with time-varying diffusivity model (DTVD), where a constant coefficient of diffusion is replaced by a decreasing function of time (by analogy with a relaxation modulus for a viscoelastic solid) [4,5]. Several models have been proposed to predict the behavior of composites based on the analogy between thermal conductivity and diffusivity [6,7]. The most extensively cited model in polymer/clay nanocomposites is the Nielsen model, which predicts that relative permeability is only a function