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High Resolution Compact Finite Difference Schemes for Convection Dominated Problems

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World Journal of Mechanics 2019年第12期9卷 259-266页

作者： Abdullah Shah Saher Akmal Khan najib ullah Department of Mathematics COMSATS University Islamabad Islamabad Pakistan

In this short article, the upwind and central compact finite difference schemes for spatial discretization of the first-order derivative are analyzed. Comparison of the schemes is provided and the best discretization ... 详细信息

关键词： Upwind Scheme Upwind Compact Scheme Flux-Difference Splitting Convection Dominated Problems

The Spectrum of a Rational Function

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Algebra Colloquium 2020年第3期27卷 477-482页

作者： Salah najib Laboratoire ATRES Faculte Polydisciplinaire de Khouribga Universite Sultan Moulay Slimane BP.145Hay EzzaytouneKhouribgaMorocco

Let k be an infinite field,A be a finite set of k,and Q∈k[x](with x=(x_(1),...,X_(n))and n≥2)be a noncons taut *** main goal of this paper is to construct a polynomial P(x)∈k[x]with suitably large partial degrees i... 详细信息

关键词： irreducible and indecomposable polynomial spectrum of rational function field with product formula Hilbert subset

Strongly Gorenstein Flat Modules and Dimensions

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Chinese Annals of Mathematics,Series B 2011年第4期32卷 533-548页

作者： najib MAHDOU Mohammed TAMEKKANTE Department of Mathematics Faculty of Science and Technology of Fez Box 2202 University S. M. Ben Abdellah Fez Morocco

There is a variety of nice results about strongly Gorenstein flat modules over coherent rings. These results are done by Ding, Lie and Mao. The aim of this paper is to generalize some of these results, and to give homological descriptions of the strongly Gorenstein flat dimension (of modules and rings) over arbitrary associative rings.

关键词： Strongly Gorenstein flat modules Gorenstein projective modules Gorenstein global (resp. weak) dimension

Neural Network Based Adaptive Tracking Control for a Class of Pure Feedback Nonlinear Systems With Input Saturation

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IEEE/CAA Journal of Automatica Sinica 2019年第1期6卷 278-290页

作者： Nassira Zerari Mohamed Chemachema najib Essounbouli the Department of Electronics Faculty of TechnologyUniversity of Constantine1 CReSTIC Laboratory University of Reims Champagne Ardennes

In this paper, an adaptive neural networks(NNs)tracking controller is proposed for a class of single-input/singleoutput(SISO) non-affine pure-feedback non-linear systems with input saturation. In the proposed approach, the original input saturated nonlinear system is augmented by a low pass ***, new system states are introduced to implement states transformation of the augmented model. The resulting new model in affine Brunovsky form permits direct and simpler controller design by avoiding back-stepping technique and its complexity growing as done in existing methods in the *** controller design of the proposed approach, a state observer,based on the strictly positive real(SPR) theory, is introduced and designed to estimate the new system states, and only two neural networks are used to approximate the uncertain nonlinearities and compensate for the saturation nonlinearity of actuator. The proposed approach can not only provide a simple and effective way for construction of the controller in adaptive neural networks control of non-affine systems with input saturation, but also guarantee the tracking performance and the boundedness of all the signals in the closed-loop system. The stability of the control system is investigated by using the Lyapunov theory. Simulation examples are presented to show the effectiveness of the proposed controller.

关键词： Adaptive control input saturation neural networks systems (NNs) nonlinear pure-feedback

Use of longitudinal magnetic resonance imaging in preclinical models of spinal cord injury

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Neural Regeneration Research 2019年第5期14卷 771-772页

作者： Harun najib Noristani Florence Evelyne Perrin INSERM U1198 University of Montpellier

Spinal cord injury(SCI)is a distressing event with grave socio/economic consequences to our *** response following SCI involves blood-spinal cord barrier breakdown,neuroinflammation and formation of a glial scar that altogether govern the feasibility of spontaneous axonal re-growth and limited functional *** advances in understanding SCI pathophysiology have been achieved using numerous transgenic mouse lines developed in different ***,there are inherent strain differences that affect inflammation,gliosis,axon regeneration and ultimately functional recovery after SCI.

关键词： Spinal cord injury(SCI) spinal cord injury

LMI solutions for H-two and H-infinity decentralized controllers applied to an aerothermic process

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控制理论与应用（英文版） 2013年第2期11卷 247-254页

作者： najib BENNIS Mustapha RAMZI Mohamed HALOUA Hussein YOULAL ENSET de Rabat Avenue de l'Arme'e Royale Madinat Al Irfane 10100 B. P. 6207 Rabat-InstitutsMorocco LASTIMI EST de sale' Universite' Mohamed V Agdal Avenue Prince sidi Mohammed B.P 227 Sale' Me'dinaMorocco EMI Avenue IbnSina B. P. 765 Agdal RabatMorocco UFR Automatique et Technologies de l'Information Faculte' des Sciences de Rabat Avenue Ibn Batouta B. P. 1014 RabatMorocco

In this paper, we present a linear matrix inequality （LMI）-based solution to implement H-two and H- infinity decentralized robust control strategies. Appropriate parametrization of optimal H-two and H-infinity controllers is used. The general formulation of the decentralized control design leads to the optimal determination of both the state feedback gains and the observer gains of the decentralized controllers. This formulation is two folds： first, a centralized controller is obtained, and then, a simplified decentralized solution is derived by optimizing only the observer gains. The mathematical determination of these gains is formulated as an LMI optimization problem that can be easily solved using LMI solvers. As an experimental evaluation of these controllers, a real time application to an aerothermic process is carried out. A continuous-time model of the process obtained with a suitable direct continuous-time identification approach is elaborated. Results illustrating the real performance obtained from the H-two and H-infinity decentralized controllers are di^cu^ge.d and comnare, d with th~ ce^ntraliTed nn^g

关键词： Parametrization approach Decentralized control H-two/H-infinity control Parameters optimization Lin-ear matrix inequality (LMI) Subspace identification Aerothermic process

Adaptive Type-2 Fuzzy Sliding Mode Controller for SISO Nonlinear Systems Subject to Actuator Faults

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International Journal of Automation and computing 2013年第4期10卷 335-342页

作者： Meriem Benbrahim najib Essounbouli Abdelaziz Hamzaoui Ammar Betta Research Center on Science and Technology of Information and Communication University of Reims Champagne Ardenne University Institute of Technology of Troyes Troyes F10026 France University of Hadj Lakhdar Batna Boukhlouf Med Elhadi StreetBatna 05000 Algeria

In this paper, an adaptive type-2 fuzzy sliding mode control to tolerate actuator faults of unknown nonlinear systems with external disturbances is presented. Based on a redundant actuation structure, a novel type-2 adaptive fuzzy fault tolerant control scheme is proposed using sliding mode control. Two adaptive type-2 fuzzy logic systems are used to approximate the unknown functions, whose adaptation laws are deduced from the stability analysis. The proposed approach allows to ensure good tracking performance despite the presence of actuator failures and external disturbances, as illustrated through a simulation example.

关键词： Type-2 fuzzy systems fault tolerant control sliding mode control adaptive system actuator faults.

On ϕ-( n,N )-ideals of Commutative Rings

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Algebra Colloquium 2023年第3期30卷 481-492页

作者： Adam Anebri najib Mahdou Ünsal Tekir Eda Yıldız Laboratory of Modelling and Mathematical Structures Department of MathematicsFaculty of Science and Technology of FezBox 2202University S.M.Ben Abdellah FezMorocco Department of Mathematics Marmara UniversityIstanbulTurkey Department of Mathematics Yildiz Technical University34220IstanbulTurkey

Let R be a commutative ring with nonzero identity and n be a positive *** this paper,we introduce and investigate a new subclass ofϕ-n-absorbing primary ideals,which are calledϕ-(n,N)-***ϕ:I(R)→I(R)∪{∅}be a function,where I(R)denotes the set of all ideals of R.A proper ideal I of R is called aϕ-(n,N)-ideal if x1⋯xn+1∈I\ϕ(R)and x1⋯xn∉I imply that the product of xn+1 with(n−1)of x1,…,xn is in 0–√for all x1,…,xn+1∈*** addition to giving many properties ofϕ-(n,N)-ideals,we also use the concept ofϕ-(n,N)-ideals to characterize rings that have only finitely many minimal prime ideals.

关键词： Φ-(n N)-ideal Φ-n-absorbing primary ideal Φ-n-absorbing ideal Φ-prime

Adaptive Fuzzy Sliding Mode Power System Stabilizer Using Nussbaum Gain

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International Journal of Automation and computing 2013年第4期10卷 281-287页

作者： Emira Nechadi Mohamed Naguib Harmas najib Essounbouli Abdelaziz Hamzaoui Electrical Engineering Department Ferhat Abbas University of Stif 1 Centre of Research for Science and Information Technology and Communication Laboratory Champagne Ardennes University

Power system stability is enhanced through a novel stabilizer developed around an adaptive fuzzy sliding mode approach which applies the Nussbaum gain to a nonlinear model of a single-machine infinite-bus （SMIB） and multi-machine power system stabilizer subjected to a three phase fault. The Nussbaum gain is used to avoid the positive sign constraint and the problem of controllability of the system. A comparative simulation study is presented to evaluate the achieved performance.

关键词： Multi-machine power system stabilizer adaptive fuzzy sliding mode Nussbaum gain Lyapounov stability.