Authors:Youssef OUAFIK Pages: 331 - 338 Abstract: We consider a mathematical model, which describes a contact problem between a piezoelectric body and a conductive foundation. The linear electro-elastic constitutive law is employed to model the piezoelectric material. The process is static, the contact is frictionless and described with the normal compliance condition and an electric contact condition. Our aim is to present a detailed description of the numerical modelling of the problem. To this end, we introduce a discrete scheme, based on the finite element method to approximate the spatial variable. Then we treat the contact conditions by using a penalized approach and a version of Newton's method. Finally, we provide numerical simulations in the study of a two-dimensional example and compare the regularized problem with the original one. PubDate: 2022-01-24 Issue No:Vol. 2, No. 1 (2022)

Authors:Bhole Varsha , Sakshi Tiwari, Vishal Chaudhari, Vaishali Patil Pages: 339 - 345 Abstract: As Covid-19 is increasing day by day, it is important to make sure that we should overcome from this. But the question arises here is that how we can overcome from this' like wearing mask, sanitizing ourself, taking necessary precautions and all. Nowadays vaccines are must, do you really think after getting vaccinated you are safe' The answer is no vaccines are to boost up our immunity level, so that if you get infected it will be not much harmful to you, so here we have implemented an application Face mask detection with alert system where we can get to know that whether the person is wearing a mask or not. If person is not wearing a mask in the premises, campus a beep sound is generated to catch that person. In this application a screen is displayed which detects the human face with or without mask and shows the percentage score of the mask worn. This application will be useful for the areas were number of peoples are more like hotels, airport, schools and colleges. Here first the model is trained on a real-world dataset having with or without face mask and then we have trained our model with live video streaming. The accuracy is obtained by increasing and decreasing the epoch value. PubDate: 2022-01-24 Issue No:Vol. 2, No. 1 (2022)

Authors:Najla Ali Pages: 346 - 354 Abstract: Polyvinylalcohol solutions of different concentrations (0.1, 0.2, 0.3, 0.4, 0.5%) of Sodium bicarbonate and Sodium chloride were prepared, then poured onto a glass plate and allowed to dry at room temperature. Thin films were formed. Viscosity, stress and strain were measured for samples The results indicate that the elasticity of the samples in the case of NaHCO3 decreased, where the sample with zero concentration was cut with stress (166X 105 N), while the sample with a concentration 5% for NaHCO3 was cut with stress equal to (107X104 N), but, in the case of NaCl it increased, where the sample with zero concentration was cut with stress (166X 105 N) while the sample with a concentration 5% for NaCl was cut with stress equal to (808X106 N. Young's modulus decreases with respect to the samples in the case of NaHCO3, while it increases in the case of NaCl, The relative viscosity increased. Viscosity of the samples that contained NaHCO3 was higher than that of the samples that contained NaCl, while the intrinsic viscosity of all the samples decreases. These results can be used to benefit from them in many fields. PubDate: 2022-01-24 Issue No:Vol. 2, No. 1 (2022)

Authors:El Mehdi LOUALID, Azzedine Achak, Radouan Daher Pages: 355 - 362 Abstract: In this paper,we consider the generalized Dunkl transform which satisfies some uncertainty principles similar to the Euclidean Fourier transform. A generalization of Cowling-Price’s theorem, Miyachi’s theorem are obtained for the generalized Dunkl transform.The techniques of the proofs are based on the properties of the generalized Dunkl kernel, the relation between the generalized Dunkl transform with the classical Dunkl transform. The results of this paper are new, and they have novelty and generalize some results exist in the literature. PubDate: 2022-01-24 Issue No:Vol. 2, No. 1 (2022)

Authors:Farshid Narges-Moghadam, Pedram Pournaderi Pages: 363 - 380 Abstract: In this paper, the free convection heat transfer of Al2O3-Water nanofluid in a square cavity is simulated, employing the finite volume technique. The homogeneous model is utilized to determine the influence of nanoparticles. The obtained results are compared with the experiment. At higher Rayleigh numbers, higher agreement between the results is observed. The nanofluid average Nusselt number increases with the Rayleigh number. For a concentration of 0.1%, the average Nusselt number increases, and for higher concentrations, it decreases, as compared with the pure fluid. Different viscosity and conductivity models were evaluated. It was found that the viscosity correlation, which takes into account the Brownian motion effect, produces more accurate results. The results obtained using different conductivity correlations were almost the same. PubDate: 2022-01-24 Issue No:Vol. 2, No. 1 (2022)

Authors:Mohammed Abattouy, Mustapha Ouardouz, Hamid Azzouzi Pages: 381 - 393 Abstract: Additive manufacturing is a capable process to produce three dimensional components from raw material and 3D design data. This layer-by-layer operating process has many advantages including high geometrical freedom to produce complex parts with reduced cost and applied especially in the aerospace, medical and automotive industry. One of the metal AM processes is Selective Laser Melting this technology is an effective manufacturing technique to build metallic and functional parts. The aim of this study is to perform an economic assessment of Selective Laser Melting by developing a cost estimation model to estimate the process cost along the process life cycle cost. The cost of manufacturing is the key point for decision making to compare the Selective Laser Melting technology with different manufacturing technologies. The cost estimation is profitable also for engineers at the preliminary design. Production costs are studied to find out parameters influencing the Selective Laser Melting process such as machine cost, material, and post processing and how is the process cost could be optimized. A case study on Selective Laser Melting of stainless steels is presented to illustrate the cost model. This work presents a more realistic cost model of Selective Laser Melting based on the activity approach and including all steps of manufacturing with SLM such as part design and post processing such as heat treatment. This research enables us to understand the entire value network of Selective Laser Melting. It has been found that, the machine cost was by far the largest factor in Selective Laser Melting, followed by the post processing cost. PubDate: 2022-01-24 Issue No:Vol. 2, No. 1 (2022)

Authors:Lan Hoang That Ton Pages: 394 - 401 Abstract: This article presents the static bending of two-directional functionally graded (FG) beam by using simple Timoshenko beam elements. The Matlab code developed based on the finite element formulation is validated by solving two-directional FG beam problems under distributed load and two boundary conditions. Numerical results which are in terms of maximum normalized transverse deflections are compared with the analytical solutions and the results from previous studies. Besides, the shapes of transverse deflection and rotation along the length of beams are also depicted in this article to provide specific views about the static behavior of proposed structure. PubDate: 2022-01-24 Issue No:Vol. 2, No. 1 (2022)

Authors:Najat Safouane, Daher Radouan Pages: 402 - 412 Abstract: The Dunkl-Bessel type transform satisfies some uncertainty principles similar to the Euclidean Fourier transform. A generalization of Beurling’s theorem, Gelfand-Shilov theorem, Cowling-Price’s theorem and Morgan’s theorem are obtained for the Dunkl-Bessel type transform. PubDate: 2022-01-24 Issue No:Vol. 2, No. 1 (2022)