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Development and Surface State Characterization of a Spacer Waterproof Breathable Fabric
Imene Ghezal,Ali Moussa,Imed Ben Marzoug,Ahmida El-Achari,Christine Campagne,Faouzi Sakli 한국섬유공학회 2020 Fibers and polymers Vol.21 No.4
This research reports the designing and the optimization of a waterproof breathable fabric. A new waterproofbreathable fabric made by coating a double sided spacer knit with a mixture of an acrylic paste and a fluorocarbon resin ispresented. The treated fabric can be used for producing outdoor garments. The surface states of treated samples werecharacterized by using the assessment of the coating add-on (%), water contact angle (o), surface free energy (mN·m-1), androughness (mm). The main coating process parameters were studied by using the Box-Behnken experimental design. It wasproved that the quantity of acrylic paste (g·m-2) and the reticulation time (min) have the most significant effect on the coatingadd-on value (%). The surface free energy (mN·m-1) is affected by the three studied factors. Roughness was also evaluatedbefore and after the coating treatment. However, no significant variation in values was noticed. Optimum responses areobtained with 2.71 % of fluorocarbon resin, 412.00 g·m-2 of acrylic paste, and a reticulation time equal to 13.52 minutes. Optimized values for the coating add-on, SFE, and roughness are equal to 79.716 %, 29.17 mN·m-1, and 0.058 mm,respectively.
Formulation of continuous element of prestressed stiffened circular cylindrical shell
Imene Harbaoui,Mohamed Amine Khadimallah,Abdelhakim Benslimane,Guoyong Jin,Ömer Civalek 국제구조공학회 2021 Steel and Composite Structures, An International J Vol.41 No.4
This paper presents a dynamic analysis of a prestressed stiffened circular cylindrical shell subjected to external distributed pressure using the dynamic stiffness method. This approach is based on the first order shear deformation theory founded on love’s first approximation theory. Natural frequencies are easily processed. The dynamic stiffness matrix has been built. The formulation of this element requires coupling pre-stressed shell and circumferential stiffener. The vibration analysis is performed with numerical examples to determine the performance of this model and the effect of presetress and stiffener on the frequency spectrum. The response of the system is determined with applied equivalent loads on element boundaries. Compared to the finite element method, the proposed element has many advantages such as the model size, the computing time, the accuracy and the higher precision.
An original HSDT for free vibration analysis of functionally graded plates
Imene Ait Sidhoum,Djilali Boutchicha,Samir Benyoucef,Abdelouahed Tounsi 국제구조공학회 2017 Steel and Composite Structures, An International J Vol.25 No.6
This work presents a free vibration analysis of functionally graded plates by employing an original high order shear deformation theory (HSDT). This theory use only four unknowns, which is even less than the classical HSDT. The equations of motion for the dynamic analysis are determined via the Hamilton‟s principle. The original kinematic allows obtaining interesting equations of motion. These equations are solved analytically via Navier procedure. The accuracy of the proposed solution is checked by comparing it with other closed form solutions available in the literature.
Imene Laoufi,Mohammed Ameur,Mohamed Zidi,El Abbes Adda Bedia,Abdelmoumen Anis Bousahla 국제구조공학회 2016 Steel and Composite Structures, An International J Vol.20 No.4
Using the hyperbolic shear deformation plate model and including plate-foundation interaction (Winkler and Pasternak model), an analytical method in order to determine the deflection and stress distributions in simply supported rectangular functionally graded plates (FGP) subjected to a sinusoidal load, a temperature and moisture fields. The present theory exactly satisfies stress boundary conditions on the top and the bottom of the plate. No transversal shear correction factors are needed because a correct representation of the transversal shearing strain is given. Materials properties of the plate (elastic, thermal and moisture expansion coefficients) are assumed to be graded in the thickness direction according to a simple power-law distribution in terms of the volume fractions of the constituents. Numerical examples are presented and discussed for verifying the accuracy of the present theory in predicting the bending response of FGM plates under sinusoidal load and a temperature field as well as moisture concentration. The effects of material properties, temperature, moisture, plate aspect ratio, side-to-thickness ratio, ratio of elastic coefficients (ceramic-metal) and three distributions for both temperature and moisture on deflections and stresses are investigated.
Imene Ait Sidhoum,Djilali Boutchicha,Samir Benyoucef,Abdelouahed Tounsi 국제구조공학회 2018 Smart Structures and Systems, An International Jou Vol.22 No.3
An original quasi-3D hyperbolic shear deformation theory for simply supported functionally graded plates is proposed in this work. The theory considers both shear deformation and thickness-stretching influences by a hyperbolic distribution of all displacements within the thickness, and respects the stress-free boundary conditions on the upper and lower surfaces of the plate without using any shear correction coefficient. By expressing the shear parts of the in-plane displacements with the integral term, the number of unknowns and equations of motion of the proposed theory is reduced to four as against five in the first shear deformation theory (FSDT) and common quasi-3D theories. Equations of motion are obtained from the Hamilton principle. Analytical solutions for dynamic problems are determined for simply supported plates. Numerical results are presented to check the accuracy of the proposed theory.
Imene Trabelsi Trigui,Georges Giraud 한국마케팅과학회 2012 마케팅과학연구 Vol.22 No.2
Consumers’ fears and anxiousness, triggered by recent food scares and crises, and technological developments such as GMOs, have led to serious concerns about food safety, ever-increasing demands for quality assurance, more information about product origin food labels, and more particularly designation-of-origin labels, such as PDO (protected designation of origin) and PGI (protected geographic indication). Region of origin food labels have become increasingly frequent and apposed to a large variety of food products. The objective of this study is to analyze consumer preferences towards labeled food products on the basis of a consumer scanned data panel.
Sidhoum, Imene Ait,Boutchicha, Djilali,Benyoucef, Samir,Tounsi, Abdelouahed Techno-Press 2018 Smart Structures and Systems, An International Jou Vol.22 No.3
An original quasi-3D hyperbolic shear deformation theory for simply supported functionally graded plates is proposed in this work. The theory considers both shear deformation and thickness-stretching influences by a hyperbolic distribution of all displacements within the thickness, and respects the stress-free boundary conditions on the upper and lower surfaces of the plate without using any shear correction coefficient. By expressing the shear parts of the in-plane displacements with the integral term, the number of unknowns and equations of motion of the proposed theory is reduced to four as against five in the first shear deformation theory (FSDT) and common quasi-3D theories. Equations of motion are obtained from the Hamilton principle. Analytical solutions for dynamic problems are determined for simply supported plates. Numerical results are presented to check the accuracy of the proposed theory.
Monia Ennouri,Imene Ammar,Bassem Khemakhem,Hamadi Attia 한국식품영양과학회 2014 Journal of medicinal food Vol.17 No.8
Opuntia ficus-indica f. inermis (cactus pear) flowers have wide application in folk medicine. However, there are few reports focusing on their biological activity and were no reports on their chemical composition. The nutrient composition and hexane extracts of Opuntia flowers at 4 flowering stages and their antibacterial and antifungal activities were investigated. The chemical composition showed considerable amounts of fiber, protein, and minerals. Potassium (K) was the predominant mineral followed by calcium (Ca), magnesium (Mg), sodium (Na), iron (Fe), and zinc (Zn). The main compounds in the various hexane extracts were 9.12-octadecadienoic acid (29–44%) and hexadecanoic acid (8.6–32%). The antibacterial activity tests showed that O. inermis hexane extracts have high effectiveness against Escherichia coli and Staphylococcus aureus, making this botanical source a potential contender as a food preservative or food control additive.
Polymers in construction: A brief review authors
Khadimallah, Mohamed Amine,Harbaoui, Imene,Hussain, Muzamal,Qazaq, Amjad,Ali, Elimam,Tounsi, Abdelouahed Techno-Press 2022 Advances in concrete construction Vol.13 No.2
Polymers, particularly plastics, have been widely seen as an existential risk to the environment due to their contribution to pollution, carbon emissions and climate change. Many argue that it is possible to substantially ease the threat of plastics by engaging the public in reducing their use in day-to-day life and implementing efficient domestic waste management strategies. On the other hand, polymers and plastics in building and construction are considerably less problematic, if not attractive. In fact, the applications of polymers in construction have been continuously expanding. This is partly due to the developments made in this area being implemented within a sustainable development strategy. In this paper, the main applications of polymers in construction have been revisited and an overview of the research topics in each application has been briefly presented.
Ghamkhar, Madiha,Harbaoui, Imene,Hussain, Muzamal,Ayed, Hamdi,Khadimallah, Mohamed A.,Alshoaibi, Adil Techno-Press 2022 Advances in nano research Vol.12 No.3
In this work, the vibrational frequency of two layered FGM cylindrical shell with and without the effects of internal pressure under ring support are discussed in detailed. The functionally graded materials of a cylindrical shell are designed for specific purpose and studied under various boundary conditions. The Love shell dynamical equations theory is utilized to find the relationship between the curvature displacement and strain displacement. Natural frequency vibrations are analyzed by using volume polynomial for bi-layered FGM shell under ring support both for with and without internal pressures.