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The current paper studied the behavior of a triangular cavity occupied with Ag-MgO/water nanofluid under MHD natural convection and provided with a rotating circular barrier, while the right-angled corner is equipped with quarter-circle porous medium and maintained at a fixed hot temperature T h . Several parameters are tested such as Rayleigh number (10 3 ≤ Ra ≤ 10 6 ), Hartmann number (0 ≤ Ha ≤ 80) and Darcy number (10 −5 ≤ Da ≤ 0.15). The obtained results depict the enhancing effect of Ra and the controlling role of the magnetic parameter on heat transport. Increasing the characteristics of the porous media such as the porosity and the permeability showed a substantial impact on the heat transport efficiency within the enclosure. Moreover, the novelty findings in this paper are principally illustrated in the boosting impact of raising the porous medium thickness when it is associated with the growing up of the heated parts of the geometry by increasing the dimension of the radius (r p ). Also, the rotational velocity (ω) and the radius (r ob ) of the circular obstacle are tested and showed an important influence on the energy transport within the cavity. Moreover, the obtained results by modifying the length (a) prove its pertinent influence on the heat transfer performance.

The authors conducted this first work of characterization of industrial effluents generated by the mineral fertilizer factory complex Fertial (Arzew), and discussed the pollution load generated by this type of industry. This monitoring would establish a tool for reflection and decision support developed by a management system capable of ensuring effective and sustainable management of effluents from industrial activities of Fertial.

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At the nanoscale system, the efficiency of carbon nanotube (CNT) reinforcement between the CNTs and polymer matrices in terms of interfacial load transferring is assessed for both nonfunctionalized and functionalized interfaces. The simulations of the mechanical properties (stress-strain) of polyethylene (PE)/CNT nanocomposites by the molecular dynamics are currently an area of discussion in the literature. In this work, PE considered as a thermoplastic material is studied, in which the characterization of its nanoscale load transfer has been carried out through the classification of representative nanoscale interface elements for nonfunctionalized CNTs for the diverse values of lengths and diameters. First, the main evaluations based on the density functional theory and the molecular dynamics method were used with the aim to examine the effect of PE monomers. Then, the effect of the diameter of CNTs with nonfunctionalization content on the electronic and mechanical properties of single-walled carbon nanotubes was examined. The findings reveal that the density of states highlights the absence of orbital hybridization between the PE monomers and nanotubes, whereas the Mulliken charge analysis depicts that the PE polymer produces a positive charge that is directly proportional to the number of monomers with many chains of PE and different diameters of CNTs. The decrease in diameters implies an increase in nanocomposites stress. In addition, the results show that the reinforcements in the longitudinal direction are more promising than those in the transverse direction.

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