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SECOND ORDER BVPS ON THE REAl lINE

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Annals of Differential Equations 2015年第1期31卷 1-14页

作者： Zakia Benbaziz smal djebali laboratoire "Théorie du point Fixe et Applications" Faculty of Computer Sciences

This paper is concerned with the solvability of a second-order integro-differential equation with Dirichlet boundary conditions on the real line. Under some conditions on the real parameters and coefficients, some exi... 详细信息

关键词： second order ODE interative method positive solutions whole line

MUlTIPlE SOlUTIONS TO SINGUlAR BVPS WITH VARIABlE COEFFICIENT ON THE HAlF-lINE

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Annals of Differential Equations 2013年第3期29卷 324-337页

作者： sma?l djebali Samira Zahar laboratoire "Théorie du point Fixe et Applications" cole Normale SupérieureB.P.9216050 KoubaAlgiersAlgeria Dept.of Math. University A.E.Mira

This paper is concerned with a singular second-order nonlinear boundary value problem with a time depending on derivative operator and posed on the positive half-line. The nonlinearity is derivative-dependent, which has singularities at t=0 and/or x=0, and may change sign. The method of the upper and lower solutions on unbounded domains combined with the topological degree theory are employed to prove the existence and multiplicity of solutions.

关键词： lower and upper solution infnity interval sign changing nonlinearity variable coefcient derivative depending nonlinearity singularity Nagumo condition multiplicity

Assessment of micro-scale heat exchangers efficiency using lattice Boltzmann method and design of experiments

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Energy and Built Environment 2024年第6期5卷 840-852页

作者： Mokhtar Ferhi Sameh Abidi Ridha djebali Fateh Mebarek-Oudina UR22ES12:Modeling Optimization and Augmented Engineering ISLAIBUniversity of JendoubaBéja 9000Tunisia Higher Institute of Humanities of Jendouba University of JendoubaTunisia Department of Management Information Systems College of Business AdministrationQassim UniversityAl-RassAl-QassimSaudi Arabia Department of Physics Faculty of SciencesUniversity of 20 août 1955-SkikdaB.P 26 Road El-HadaiekSkikda 21000Algeria laboratoire des Matériaux et Génie Energétique(lMGE) University of 20 août 1955-SkikdaSkikda 21000Algeria

The study is focused on the use of nanofluids in a micro-open tall cavity,which is a type of micro heat exchanger(MHE).The cavity is heated from the bottom sidewall in a sinusoidal pattern,and the effects of four input parameters(Ra,Ha,Kn,and Vf)on heat transfer and irreversibility are investigated using numerical simulations based on lattice Boltzmann Method(lBM).The findings of the study suggest that the local heat transfer on the bottom sidewall is strongly influenced by Ra and Ha,while the surface distribution of entropy generation is mainly dependent on *** study also shows that the optimization of the magnitude and wavelength of the sinusoidal temperature can improve both local heat transfer and surface distribution of entropy *** results of the study provide valuable insights into the design of micro heat exchangers and suggest that the optimization of micro-porous geometries using DOE could lead to increased energy *** study contributes to our understanding of the complex interactions between input parameters in micro heat exchangers and highlights the importance of considering multiple parameters in the design process.

关键词： MHD Slip flow regime Micro heat exchanger Design of experiments Optimization

Investigating Plasma Jets Behavior using Axisymmetric lattice Boltzmann Model under Temperature Dependent Viscosity

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Communications in Computational Physics 2014年第3期15卷 677-691页

作者： Ridha djebali ISlAIB–Beja 9000 University of JendoubaTunisia

This study aims to investigate turbulent plasma flow using the lattice Boltzmann(lB)method.A double population model D2Q9-D2Q4 is employed to calculate the plasma velocity and temperature *** with the calculation process a conversion procedure is made between the lB and the physical unit systems,so that thermo-physical properties variation is fully accounted for and the convergence is checked in physical *** configuration domain and the boundary condition treatment are selected based on the most cited studies in order to illustrate a realistic *** jet morphology analysis gives credible results by comparison with commonly published *** was demonstrated also that accounting for the substrate as wall boundary condition modify greatly the flow and temperature structures with may affect absolutely the particles behavior during its in-flight in the hot gas.

关键词： lB method axisymmetric model temperature dependent viscosity turbulence plasma jets

Testing the governance-performance relationship for the Tunisian banks: a GMM in system analysis

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Financial Innovation 2020年第1期6卷 411-434页

作者： Nesrine djebali Khemais Zaghdoudi Faculty of law Economics and Management of Jendouba University of JendoubaJendoubaTunisia

Rationale:This study aims to contribute to settling the lack of consensus regarding the determinants of bank performance,not only by considering bank governance,but also by including factors such as CEO compensation and risk management *** literature has included bank governance and considered only large banks in their *** exclusion of other factors such as small-and medium-size banks may render the findings of these studies limited in ***:The objective of this paper is to examine the impact of internal governance on bank ***:To achieve this goal,we used annual data of a sample of ten Tunisian commercial banks listed in the Tunisian Stock Exchange observed during the period 1998–*** use the Generalized Method of Moments(GMM)to estimate the parameters of our econometric ***:Our study finds that the correlation between the size of the board of directors,the state’s inclusion,and the presence of independent directors is positive and *** the other hand,we have found that CEO compensation,as well as foreign and institutional investors negatively affect the performance of the *** and implications:Tunisian banks are invited to broaden their size through appropriate restructuring,adopt new remuneration policies and define the optimal number of directors representing the state within the board of *** results suggest managerial implications that can be of great value to ensuring the success of Tunisian *** latter should favor a higher presence of independent directors to reduce the bank control ineffectiveness caused by having a significant number of foreign and institutional investors in the board of directors.

关键词： Bank governance Bank performance Tunisian banks GMM

Some Advances in Applications of lattice Boltzmann Method for Complex Thermal Flows

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Advances in Applied Mathematics and Mechanics 2010年第5期2卷 587-608页

作者： Ridha djebali Habib Sammouda Mohammed El Ganaoui University of Tunis El-Manar FS of TunisDepartment of PhysicsLETTM1060 TunisTunisia CNRS/SPCTS UMR 6638FST of LimogesDepartment of Physics87060 LimogesFrance

Over the past two decades,there have been enormous advances in lattice Boltzmann(lB)numerical simulation and *** lattice Boltzmann method has become a practical and promising tool for many fluid problems.A majority of recent studies have relied on numerical computations of isothermal ***,much less efforts have been devoted to complex thermal flows,such as flows in porous media subjected to external magnetic force,flows with temperature-dependent *** this paper,an overview is made based on some accomplishments in these numerical *** with the paper’s sections,the state-of-the-art trend and the lBM advances in modelling and in computational aspects for specific classes of problems of major interest will be fully touched *** remarks are given and the axis of our future studies will be traced.

关键词： lB method Bifurcations and instability porous media flows plasma jets