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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

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.

Vibrations of a laboratory-scale gas-stirred ladle with two eccentric nozzles and multiple sensors

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Journal of Iron and Steel Research International 2019年第10期26卷 1031-1040页

作者： najib Alia Mika Pylvanainen Ville-Valtteri Visuri Volker John Seppo Ollila Weierstrass Institute for Applied Analysis and Stochastics(WIAS) Berlin 10117Germany Intelligent Machines and Systems University of OuluOulu 90014Finland Process Metallurgy Research Unit University of OuluOulu 90014Finland Department of Mathematics and Computer Science Freie Universit(a)it BerlinBerlin 14195Germany SSAB Europe Oy Raahe 92101Finlan

During ladle stirring,a gas is injected into the steel bath to generate a mixing of the liquid *** optimal process control requires a reliable measurement of the stirring intensity,for which the induced ladle wall vibrations have proved to be a potential *** experimental cold water ladle with two eccentric nozzles and eight mono-axial accelerometers was thus investigated to measure the *** effect of the sensors'positions with respect to the gas plugs on the vibration intensity was analyzed,and experimental data on several points of the ladle were collected for future numerical *** is shown that the vibration root-mean-square values depend not only on process parameters,such as gas flow rate,water,and oil heights,but also on the radial and axial positions of the *** vibration intensity is clearly higher,close to the gas plumes,than in the opposite *** one of the nozzles is clogged,the vibration intensity close to the clogged nozzle drops drastically(-36 to-59%),while the vibrations close to the normal operating nozzle are hardly *** on these results,guidelines are provided for an optimized vibration-based stirring.

关键词： Ladle metallurgy Gas stirring Ladle vibration Optimal position Sensor

Optimization of colorectal cancer screening strategies: New insights

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World Journal of Gastroenterology 2024年第28期30卷 3361-3366页

作者： Magie Tamraz najib Al Ghossaini Sally Temraz Department of Nutrition and Public Health Holy Spirit University of KaslikJounieh 446Lebanon Department of Internal Medicine Ain Wazein Medical VillageChouf 1503Lebanon Department of Internal Medicine Division of Hematology/OncologyAmerican University of Beirut Medical CenterBeirut 11072020Lebanon

In this editorial,we discuss the article by Agatsuma et *** concentrate specifically on the current routinely used screening tests recommended by society guidelines and delve into the significance of early diagnosis of colorectal cancer(CRC)and its substantial impact on both incidence and mortality *** is highly recommended,and an early diagnosis stands out as the most crucial predictor of survival for CRC ***,it is essential to identify and address the barriers hindering adherence to screening measures,as these barriers can vary among different ***,we focus on screening strategy optimization by selecting high-risk *** with comorbidities who regularly visit hospitals have been diagnosed at an early stage,showing no significant difference compared to patients undergoing regular *** finding highlights the importance of extending screening measures to include patients with comorbidities who do not routinely visit the hospital.

关键词： Colorectal neoplasms Early diagnosis Barriers to adherence Cancer screening guidelines Screening tests