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Existence and numerical approximation of a solution to frictional contact problem for electro-elastic materials

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Applied Mathematics(A Journal of Chinese Universities) 2024年第2期39卷 201-219页

作者： Othman Baiz EL-Hassan Benkhira rachid Fakhar University Ibn Zohr Lab.ESERFP of OuarzazateMorocco University Moulay Ismail Faculty of SciencesLaboratory MACSESTMBP 3103Toulal-MeknesMorocco University Sultan Moulay Slimane Laboratory LS2MEPolydisciplary Faculty of Khouribga25000 KhouribgaMorocco

In this paper,a frictional contact problem between an electro-elastic body and an electrically conductive foundation is *** contact is modeled by normal compliance with finite penetration and a version of Coulomb’s law of dry friction in which the coefficient of friction depends on the *** addition,the effects of the electrical conductivity of the foundation are taken into *** model leads to a coupled system of the quasi-variational inequality of the elliptic type for the displacement and the nonlinear variational equation for the electric *** existence of a weak solution is proved by using an abstract result for elliptic variational inequalities and a fixed point ***,a finite element approximation of the problem is *** some regularity conditions,an optimal order error estimate of the approximate solution is ***,a successive iteration technique is used to solve the problem numerically and a convergence result is established.

关键词： piezoelectric material frictional contact variational Inequality fixed point process finite element method error estimation iteration method

Impact of Varying Blower Opening Degrees on Indoor Environment and Thermal Comfort

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Fluid Dynamics & Materials Processing 2024年第8期20卷 1703-1716页

作者： Shengqiang Shi Abdelatif Merabtine rachid Bennacer Julien Kauffmann UR LASMIS Universitéde Technologie de Troyes12 Rue Marie CurieTroyes10300France EPF Campus de Troyes Rosière-prés-Troyes10430France Construction Engineering Department École de Technologie Supérieure(ÉTS)University of Québec1100 Rue Notre-Dame OuestMontrealQC H3C 1K3Canada LMT/ENS-Paris-Saclay/CNRS UniversitéParis SaclayGif-sur-Yvette91190France

At present,air handling units are usually used indoors to improve the indoor environment ***,while introducing fresh air to improve air quality,air velocity has a certain impact on the occupants’thermal ***,it is necessary to explore the optimization of air-fluid-body interaction *** this study,the indoor air flow was changed by changing the opening and closing degree of the blower,and the thermal manikin is introduced to objectively evaluate the human thermal comfort under different air *** main experimental results show that the air change rate increases with the increase of the opening and closing degree of the blower considering an ACH(air changes per hour)range between 3.8 and *** a better prediction,a linear correlation with a coefficient of 0.995 is *** the blower’s opening is adjusted to 20%,25%,30%,35%,and 40%,the air velocity sensor positioned directly beneath the air inlet records average velocities of 0.19,0.20,0.21,0.28,and 0.34 m/s over four hours,*** on thermal comfort and the average sensation experienced by individuals indicate an initial increase followed by a decline when the blower’s operation begins,with optimal conditions achieved at a 35%*** findings offer valuable insights for future indoor air ventilation and heat transfer design strategies.

关键词： Air handle unit air velocity thermal comfort thermal sensation

Perspectives and Experiences of Education Stakeholders: A Quantitative Study on the Adoption of Artificial Intelligence in Executive Training Using Structural Equation Modeling

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Intelligent Information Management 2024年第2期16卷 104-120页

作者： El Mostafa Atoubi rachid Jahidi Regional Center for Education and Training Professions (CRMEF) Casablanca Morocco ENCG Settat Hassan 1st University Settat Morocco

The recent increase in the use of artificial intelligence has led to fundamental changes in the development of training and teaching methods for executive education. However, the success of artificial intelligence in regional centers for teaching and training professions will depend on the acceptance of this technology by young executive trainees. This article discusses the potential benefits of adopting AI in executive training institutions in Morocco, specifically focusing on CRMEF Casablanca Settat. Based on the Unified Theory of Acceptance and Use of Technology (UTAUT) (Venkatesh et al., 2003), this study proposes a model to identify the factors influencing the acceptance of artificial intelligence in regional centers for teaching professions and training in Morocco. To achieve this, a structural equation modeling approach was used to quantitatively describe the impact of each factor on AI adoption, utilizing data collected from 173 young executive trainees. The results indicate that perceived ease of use, perceived usefulness, trainer influence, and personal innovativeness influence the intention to use artificial intelligence. Our research provides managers of CRMEFs with a set of practical recommendations to enhance the implementation conditions of an artificial intelligence system. It aims to understand which factors should be considered in designing an artificial intelligence system within regional centers for teaching professions and training (CRMEFs).

关键词： Artificial Intelligence Technology Acceptance Intention to Use UTAUT Model Personal Innovativeness of Young Executive Trainees

Effect of No Tillage and Conventional Tillage on Wheat Grain Yield Variability: A Review

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Journal of Environmental & Earth Sciences 2024年第1期6卷 57-70页

作者： Kenza Kadiri Hassani Moussadek rachid Baghdad Bouamar Zouahri Abdelmjid Dakak Houria Maher Hassnae Bouabdli Abdelhak Laboratory of Geosciences Department of GeologyFaculty of SciencesIbn Tofail UniversityKenitra B.P.242Morocco International Center for Agricultural Research in the Dry Areas(ICARDA) Rabat P.O.Box 1014Morocco Research Unit on Environment and Conservation of Natural Resources Regional Center of RabatNational Institute of Agricultural ResearchRabat P.O.Box 6356Morocco Georesources Environmentalist Consultant/Expert Associate Professor at Casablanca School of Architecture and Landscape-Honoris United UniversitiesCasablancaB.P.20100Morocco Laboratory of Materials Nanotechnology and EnvironmentDepartment of ChemistryFaculty of SciencesMohammed V UniversityRabat B.P.703Morocco

Conservation Agriculture(CA)covers more than 205 million hectares in the *** made it possible to face and mitigate the challenges of climate change,reducing soil erosion and providing multiple ecosystem *** first elementary factor influenced is the yield *** has a direct effect on farmers’choices for sustainable *** present article records a review focused on wheat yield average positive change compared between conventional tillage(CT)and no tillage(NT)*** international database collected showed that NT is adaptable *** results of wheat yield differentiation showed the influence of crop rotation depending on stations located in different climatic *** more than 40 years of research,specialists have succeeded in demonstrating the importance of crop productivity like *** whole integrates also experimentations where the initiation starts more than ten years.

关键词： Climate change No tillage Crop rotation Wheat Yield

GIS Application in Urban Flood Risk Analysis: Midar as a Case Study

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Open Journal of Ecology 2024年第2期14卷 148-164页

作者： Adil Akallouch Ayoub Al Mashoudi Mouloud Ziani rachid Elhani Sidi Mohamed Ben Abdellah University Fez Morocco Abdelmalek Essaadi University Tetouan Morocco

The significance of this study lies in its exploration of the advanced applications of Geographic Information Systems (GIS) in assessing urban flood risks, with a specific focus on Midar, Morocco. This research is pivotal as it showcases that GIS technology is not just a tool for mapping, but a critical component in urban planning and emergency management strategies. By meticulously identifying and mapping flood-prone areas in Midar, the study provides invaluable insights into the potential vulnerabilities of urban landscapes to flooding. Moreover, this research demonstrates the practical utility of GIS in mitigating material losses, a significant concern in flood-prone urban areas. The proactive approach proposed in this study, centered around the use of GIS, aims to safeguard Midar’s population and infrastructure from the devastating impacts of floods. This approach serves as a model for other urban areas facing similar challenges, highlighting the indispensable role of GIS in disaster preparedness and response. Overall, the study underscores the transformative potential of GIS in enhancing urban resilience, making it a crucial tool in the fight against natural disasters like floods.

关键词： Geographic Information Systems Risk Assessment Models Hydrological Modeling Urban Planning Decision-Making Methods Urban Centers

Impact of Data Quality on Question Answering System Performances

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Intelligent Automation & Soft Computing 2023年第1期35卷 335-349页

作者： rachid Karra Abdelali Lasfar LASTIMI Laboratory Mohammadia School of EngineersMohammed V University in RabatMorocco

In contrast with the research of new models,little attention has been paid to the impact of low or high-quality data feeding a dialogue *** present paper makes thefirst attempt tofill this gap by extending our previous work on question-answering(QA)systems by investigating the effect of misspelling on QA agents and how context changes can enhance the *** of using large language models trained on huge datasets,we propose a method that enhances the model's score by modifying only the quality and structure of the data feed to the *** is important to identify the features that modify the agent performance because a high rate of wrong answers can make the students lose their interest in using the QA agent as an additional tool for distant *** results demonstrate the accuracy of the proposed context simplification exceeds 85%.Thesefindings shed light on the importance of question data quality and context complexity construct as key dimensions of the QA *** conclusion,the experimental results on questions and contexts showed that controlling and improving the various aspects of data quality around the QA system can significantly enhance his robustness and performance.

关键词： DataOps data quality QA system nlp context simplification

TWO DISJOINT AND INFINITE SETS OF SOLUTIONS FOR AN ELLIPTIC EQUATION INVOLVING CRITICAL HARDY-SOBOLEV EXPONENTS

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数学物理学报:B辑英文版 2023年第5期43卷 2061-2074页

作者： Khalid BOUABID rachid ECHARGHAOUI Mohssine EL MANSOUR Department of Mathematics Faculty of SciencesIbn Tofail UniversityKenitraB.P.133Morocco

In this paper,by an approximating argument,we obtain two disjoint and infinite sets of solutions for the following elliptic equation with critical Hardy-Sobolev exponents■whereΩis a smooth bounded domain in RN with 0∈?Ωand all the principle curvatures of?Ωat 0 are negative,a∈C1(Ω,R*+),μ>0,02(q+1)/(q-1).By2*:=2N/(N-2)and 2*(s):(2(N-s))/(N-2)we denote the critical Sobolev exponent and Hardy-Sobolev exponent,respectively.

关键词： Laplacien critical Sobolev-Hardy exponent critical Sobolev exponent infinitely many solutions Pohozaev identity

Fabrication of branch-like Aph@LDH-MgO material through organic-inorganic hybrid conjugation for excellent anti-corrosion performance

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镁合金学报(英文) 2023年第7期11卷 2469-2485页

作者： Maryam Chafiq Abdelkarim Chaouiki rachid Salghi Young Gun Ko Materials Electrochemistry Laboratory School of Materials Science and EngineeringYeungnam UniversityGyeongsan 38541Republic of Korea Laboratory of Applied Chemistry and Environment ENSAUniversity Ibn ZohrPO Box 1136Agadir80000Morocco

Layered double hydroxides(LDH)frameworks have shown significant enhancement in stability and reusability,and their tailorable architecture brings new insight into the development of the next generation of hybrid materials,which attracted considerable attention in many fields over the *** of the factors contributing to the widespread applicability of layered double hydroxides is their adaptable composition,which can accommodate a wide spectrum of potential anionic *** exceptional property makes the LDH system simple to adjust for various ***,most LDH systems are synthesized in situ in an autoclave at high temperatures and pressures that severely restrict the industrial use of such coating *** this study,LDH was directly synthesized on a magnesium alloy that had undergone plasma electrolytic oxidation(PEO)treatment in the presence of ethylenediaminetetraacetic acid,thereby avoiding the use of hydrothermal autoclave *** LDH system was compared with a hybrid architecture consisting of organic-inorganic *** organic layer was fabricated on top of the LDH film using 4-Aminophenol(Aph)compound,resulting in a smart hierarchical structure that can provide a robust Aph@LDH film with excellent anti-corrosion *** the molecular level,the conjugation characteristics and adsorption mechanism of Aph molecule were studied using two levels of theory as ***,Localized orbit locator(LOL)-πisosurface,electrostatic potential(ESP)distribution,and average local ionization energy(ALIE)on the molecular surface were used to highlight localization region,reveal the favorable electrophilic and nucleophilic attacks,and clearly explore the type of interactions that occurred around interesting ***,first-principles based on density functional theory(DFT)was applied to study the hybrid mechanism of Aph on LDH system and elucidate their mutual *** experimental and computational analyses suggest t

关键词： Magnesium alloy Surface modification LDH Organic-inorganic hybrid materials Inter-/intra-molecular interactions

Function approximation reinforcement learning of energy management with the fuzzy REINFORCE for fuel cell hybrid electric vehicles

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Energy and AI 2023年第3期13卷 76-87页

作者： Liang Guo Zhongliang Li rachid Outbib Fei Gao Aix-Marseille University LIS UMR CNRS 7020MarseilleFrance Universite de Franche-Comte UTBMCNRSinstitut FEMTO-STF-90000 BelfortFrance UTBM CNRSinstitut FEMTO-STF-90000 BelfortFrance

In the paper,a novel self-learning energy management strategy(EMS)is proposed for fuel cell hybrid electric vehicles(FCHEV)to achieve the hydrogen saving and maintain the battery *** the EMS,it is proposed to approximate the EMS policy function with fuzzy inference system(FIS)and learn the policy parameters through policy gradient reinforcement learning(PGRL).Thus,a so-called Fuzzy REINFORCE algorithm is first proposed and studied for EMS problem in the *** REINFORCE is a model-free method that the EMS agent can learn itself through interactions with environment,which makes it independent of model accuracy,prior knowledge,and expert ***,to stabilize the training process,a fuzzy baseline function is adopted to approximate the value function based on FIS without affecting the policy gradient ***-over,the drawbacks of traditional reinforcement learning such as high computation burden,long convergence time,can also be *** effectiveness of the proposed methods were verified by Hardware-in-Loop *** adaptability of the proposed method to the changes of driving conditions and system states is also verified.

关键词： Energy management strategy Fuel cell hybrid electric vehicle Reinforcement learning Fuzzy inference system Fuzzy policy gradient Hardware-in-loop