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Khaled Mahmoudi,Khaled Hosni,Noureddine Hamdi,Ezzeddine Srasra 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.2
The adsorption of Methylene blue and Methyl orange by date pits carbon was carried out by varying parameterssuch as agitation time, pH and dye concentration. Equilibrium adsorption data followed both Langmuir and Freundlichisotherms. Adsorption followed second-order rate kinetics. The adsorption capacity was found to be 434 and455mg of methyl orange and methylene blue, respectively, per g of the date pits carbon. Acidic pH is favorable for theadsorption of methyl orange against a basic medium which is favorable for the adsorption of MB. An opposite resultwas found for the methylene blue adsorption.
Redhwane Ait Atmane,Noureddine Mahmoudi,Riadh Bennai,Hassen Ait Atmane,Abdelouahed Tounsi 국제구조공학회 2021 Steel and Composite Structures, An International J Vol.39 No.1
In this work, the dynamic response of functionally graded beams on variable elastic foundations is studied using a novel higher-order shear deformation theory (HSDT). Unlike the conventional HSDT, the present one has a new displacement field which introduces undetermined integral variables. The FG beams were assumed to be supported on Winkler-Pasternak type foundations in which the Winkler modulus is supposed to be variable in the length of the beam. The variable rigidity of the elastic foundation is assumed to be linear, parabolic and sinusoidal along the length of the beam. The material properties of the FG porous beam vary according to a power law distribution in terms of the volume fraction of the constituents. The equations of motion are determined using the virtual working principle. For the analytical solution, Navier method is used to solve the governing equations for simply supported porous FG beams. Numerical results of the present theory for the free vibration of FG beams resting on elastic foundations are presented and compared to existing solutions in the literature. A parametric study will be detailed to investigate the effects of several parameters such as gradient index, thickness ratio, porosity factor and foundation parameters on the frequency response of porous FG beams.
Study on stability and free vibration behavior of porous FGM beams
Riadh Bennai,Redhwane Ait Atmane,Fabrice Bernard,Mokhtar Nebab,Noureddine Mahmoudi,Hassen Ait Atmane,Salem Mohammed Aldosari,Abdelouahed Tounsi 국제구조공학회 2022 Steel and Composite Structures, An International J Vol.45 No.1
In this paper, buckling and free vibration of imperfect, functionally graded beams, including porosities, are investigated, using a higher order shear strain theory. Due to defects during the manufacturing process, micro porosities may appear in the material, hence the appearance of this imperfection in the structure. The material properties of the beams are assumed to vary regularly, with power and sigmoid law, in the direction of thickness. A novel porosity distribution affecting the functionally graded volume fraction is presented. For the compact formulation used for cementite-based materials and already used in P-FGM, we have adapted it for the distribution of S-FGM. The equations of motion in the FG beam are derived using Hamilton's principle. The boundary conditions for beam FG are assumed to be simply supported. Navier's solution is used to obtain the closed form solutions of the FG beam. The numerical results of this work are compared with those of other published research to verify accuracy and reliability. The comparisons of different shear shape functions, the influence of porosity, thickness and inhomogeneity parameters on buckling and free vibration of the FG beam are all discussed. It is established that the present work is more precise than certain theories developed previously.