Contribution List

55 out of 55 displayed
  1. Ms Amina Ghrib (Laboratery of Pure and Applied Mathematics, University of Laghouat, Laghouat 03000, Algeria.)

    \textbf{Abstract.}
    We establish well-posedness and strong stability for a degenerate wave equation with tempered fractional damping, complemented by an fPINN numerical approximation.

    \textbf{Keywords:} Degenerate wave equation; tempered Caputo damping; $C_0$-semigroup; strong stability; fPINN.

    \section{Model and Main Results}

    Let $\Omega=(0,1)$ and consider
    [
    u_{tt}-(x^m...

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  2. Ms Chaimaa Kahlallou (Université de Mostaganem)

    In this paper, we investigate a class of fractional differential equations. We first prove the existence and uniqueness of solutions by applying the Banach fixed point theorem. Then, we use the Schauder fixed point theorem to establish the existence of at least one solution under appropriate assumptions. Finally, illustrative examples are provided to demonstrate the applicability and...

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  3. Dr Amina Hallal (Department of Mathematics, Faculty of Sciences, Mouloud Mammeri University Tizi Ouzou, 15000, Algeria)

    This work focuses on unconstrained multi-objective optimization problems, where the presence of several objectives generally prevents the existence of a unique minimizer. Consequently, the classical zero-gradient condition is replaced by the concept of Pareto stationarity for the vector-valued objective function. The authors propose a gradient-based descent framework that generates a common...

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  4. Mr CHOUFA ABDELWAHAB (University of Ferhat Abbas ,Setif1,Algeria)

    The conjugate gradient (CG) method is known to be an efficient algorithm for large-scale unconstrained optimization owing to its low memory requirement and fast convergence properties. In this work, we propose a new hybrid nonlinear conjugate gradient method where the conjugate parameter \beta_k is defined as a convex combination of \beta_k^{NPRP} and \beta_k^{DY}. The combination parameter...

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  5. Ms Doursaf Zaraoulia (université Mohamed chérif Messaadia , Souk ahras)

    First-kind Fredholm integral equations with algebraically weakly singular kernels are severely ill-posed, making numerical solutions highly sensitive to data noise. To overcome this instability, we introduce a robust two-stage numerical framework. First, the unknown solution is projected onto a basis of orthogonal Legendre polynomials, transforming the integral equation into a discrete linear...

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  6. Dr Ilhem KADRI (University of Oran 1 Ahmed ben Bella)

    This study explores an innovative residual power series method (RPST) for examining time-fractional convection-diffusion equations (TFC-DEqs) that represent transport phenomena with memory and anomalous diffusion characteristics. The methodology is suitable for both linear and nonlinear cases, as it avoids linearization, discretization, and other simplifying assumptions. The reliability of the...

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  7. Dr asma maadadi (Unéversité Mohamed El Bachir El Ibrahimi-Bordj Bou Arreridj-Algeria)

    In this work, we propose a numerical collocation method for solving linear Fredholm integro-differential equations using shifted Chebyshev polynomials of the third kind. The approximate solution, its derivatives, and the integral operator are expressed in matrix form, leading to a system of algebraic equations in which the initial conditions are incorporated directly. Numerical experiments...

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  8. Mr Abdelouakil Fillali (Operationel Research)

    Stochastic Gradient Descent (SGD) is the cornerstone of large-scale
    optimization; however, its application to problems with a vast number
    of constraints remains a significant challenge. Methods based on relaxed
    logarithmic barrier functions have enabled the use of SGD by sampling
    constraints, yet the reliance on single samples in these methods often
    leads to high variance and oscillations...

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  9. Meriem BENAOUAD (Abdelhamid Ibn Badis University - Mostaganem)

    In this work, we study the admissibility of singular linear parameter-varying (LPV) systems by combining the Weierstrass canonical form with the C-monomial decomposition. The Weierstrass transformation is first used to rewrite the original singular system in an equivalent form, where the dynamic and algebraic components can be treated separately. This representation makes it possible to...

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  10. Dr Abdelhak Abdallah (Department of Mathematics, Hassiba Benbouali University, Chlef, Algeria)

    Abstract
    The main objective of this work is to prove the existence, unique
    ness of the mild solution for abstract hybrid fractional diffusion equa
    tions by using the resolvent operators and fixed point theorems. More
    over, we studied an example on partial differential equation with Ca
    puto fractional derivative.
    Keywords: Caputo fractional derivative, Abstract hybrid equation,...

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  11. Dr Aasma Nazir (Govt. Sadiq College Women University, Bahawalpur, Pakistan)

    Symmetry structures of non-static cylindrically symmetric spacetimes are classified under f(R) gravity by exploring their proper curvature collineations (CCs). Utilizing direct integration and Riemann matrix rank analysis, we extract 23 distinct geometric cases based on the behavior of the f(R) function. A detailed inspection shows that three cases fail to admit proper CCs, admitting only...

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  12. Mr Mohammed Ahmed (Taraba State University Jalingo)

    Presented was the application of the Flower Pollination Optimisation Algorithm (FPA) on a Proportional Integral Derivative (PID) controller (FPC) for a satellite system. Different control techniques were proposed for satellite systems, and the Proportional Integral Derivative (PID) maintained its popularity due to its ease of application and simplicity. The FPA abilities made it worth...

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  13. Dr Djemaia BENSIKADDOUR (Department of Mathematics and Computer Science)

    This final-year research project explores the application of graph theory and probabilistic graphical models to simulate attack propagation in telecommunication networks. The theoretical framework covers Bayesian and Markov networks to model uncertainty, as well as dynamic graphs to capture temporal evolution. A practical case study is conducted on Algérie Télécom’s FTTH (Fiber to The Home)...

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  14. Lamia Derrouiche

    This contribution investigates the asymptotic behavior of an M/G/1 retrial queue with priority customers, a Bernoulli service schedule, and general retrial times. We focus on the regime of low retrial rates and examine how the retrial mechanism influences the asymptotic characteristics of the system. Using the analytical framework developed for the underlying queueing model, we derive limiting...

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  15. Mr Boumedienne Bouti (Mohamed Khider University of Biskra)

    Accurately estimating the dependence structure between paired survival times subject to right-censoring is a fundamental problem in biomedical research, reliability engineering, and actuarial modeling. Classical inference methods such as Pseudo-Maximum Likelihood (PML) rely on copula densities, which frequently suffer from numerical non-convergence and computational instability under heavy...

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  16. Prof. Prerna Sharma (Sardar Vallabh Bhai Patel University of Agriculture and Technology, Meerut (U.P.), India)
    Analysis

    Abstract: This study proposes a new variant of Baskakov-Kantorovich operators based on μ integration. Connected directly to exponential functions, these operators are evaluated through moment estimates. Furthermore, we establish key direct convergence properties using the modulus of continuity.
    Keywords: Baskakov-Kantorovich operators, Linear positive operators, uniform convergence, ...

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  17. Dr Ibrahim Sadok (Bechar university)

    Large Language Models (LLMs) have demonstrated remarkable performance across a wide range of natural language processing tasks, but their predictions may be accompanied by substantial uncertainty, particularly when applied to unfamiliar or ambiguous inputs. This paper develops a distribution-free framework for uncertainty quantification in black-box LLMs using conformal prediction. The...

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  18. Mrs Siham Soufli (University M'hamed Bougara Boumerdes)

    This study investigates the application of Gr¨unwald–Letnikov frac-
    tional calculus to Gross Domestic Product (GDP) modeling, focusing
    on Senegal’s macroeconomic indicators. By allowing variable-specific
    non-integer differentiation orders (αk), the model captures complex
    memory effects and continuous time-series dynamics often missed by
    integer-order approaches. Empirical estimates,...

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  19. Prof. Abdelkarim Kelleche (Faculty of matter sciences and computer science, University of Khemis Miliana, Algeria)

    This paper is concerned with a nonlinear wave equation with logarithmic damping

    and logarithmic source terms. Using the Faedo–Galerkin method, compactness tech-
    niques, and monotonicity arguments, we establish the local existence and uniqueness

    of the solution. We further derive energy estimates to analyze the interplay between
    dissipation and nonlinear source effects, proving the...

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  20. Prof. Lamine Bouzettouta (University of 20 August 1955, Skikda)
    Differential Equations

    In this paper, we investigate the well-posedness and asymptotic behavior of solutions for a Timo-shenko system incorporating distributed delay and thermodi¤usion e¤ects. Using the semigroup technique, we establish the well-posedness of the system under suitable assumptions on the weight of the distributed delay.
    Additionally, by employing the energy method based on the multiplier technique,...

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  21. Mrs Hayat Benchira (Department of Mathematics, University of Abou Bekr Belkaïd Tlemcen, Algeria)

    We investigate a class of nonlinear p-Kirchhoff-type elliptic problems involving the critical Sobolev exponent. Such problems arise in several branches of mathematical physics and engineering, where nonlocal effects play a significant role in the modeling of complex phenomena. The presence of the critical Sobolev exponent introduces substantial analytical difficulties due to the lack of...

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  22. Mr Rachid Klikhat (university of amar telidji laghouat-Department of Mathematics)

    *Abstract
    In this paper, we study a class of fourth-order nonlinear elliptic equations on compact Riemannian manifolds. Using variational methods and critical point theory, we establish the existence of at least three distinct solutions in the constant coefficient case.
    Keywords*
    Elliptic equations, Critical Sobolev exponent , Compact Rienmannin manifolds, Plais-Smale condition,...

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  23. Dr Khedidja Abidi (Amar Telidji université of Laghouat)

    We consider a nonlinear viscoelastic equation involving both a memory term and an internal time-delay effect. The interaction between memory and delay introduces additional difficulties in the analysis of the long-time behavior of solutions. Under suitable assumptions on the relaxation kernel and the delay parameters, the existence of a global solution is established by means of the...

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  24. Dr Mohamed HOUASNI

    This work investigates the well-posedness and asymptotic stability of a coupled system of Lam´e wave equations with logarithmic nonlinearity and time delay.

    \begin{equation}
    \left{
    \begin{array}{ll}
    \mathbf{Y}{tt}-\gamma \Delta \mathbf{Y}-(\alpha +\gamma )\nabla (\operatorname{div} \mathbf{Y})+\alpha
    {1}\mathbf{Y}{t}+\alpha {2}\mathbf{Y}{t}(t-\tau {1})=F_{1}(Y,Z), &
    x\in...

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  25. Ms Fatma zohra daoud (Departement of mathematics, University of Tiaret)

    The incorporation of memory effects into epidemic models has become
    increasingly important for accurately describing disease transmission.
    In this work, we investigate a fractional-order SEIR epidemic model with
    asymptomatic infectious individuals and a general nonlinear incidence
    rate. The model is formulated using the Caputo fractional derivative of
    order $\gamma \in (0,1)$ and is...

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  26. Mr Mohammed Ahmed (Taraba State University Jalingo)

    The Grey Wolf Optimisation algorithm (GWOa) was presented for optimal tuning of Proportional Integral Derivative controller (PIDc) targeted at enhancing the performance of satellite system. Control systems are important components whose tasks involved maintaining the satellite at orbit, playing crucial roles of regulating the positioning precision as well as robustness to uncertainties for...

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  27. Dr Shreekant Pathak (Madhuben and Bhanubhai Patel Institute Of Technology Vallabh Vidyanagar)

    Secondary oil recovery is an essential stage in petroleum reservoir management, aimed at
    extracting residual oil that remains trapped in porous formations after primary recovery. Water
    flooding is one of the most widely used secondary recovery techniques; however, the efficiency
    of oil displacement depends strongly on the porous medium's structural characteristics,
    permeability, fluid...

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  28. Mr Abdelouakil Fillali (Operationel Research)

    Traditional discrete-time approaches to constrained optimization via adap-
    tive relaxed barriers impose a strictly positive lower bound on the barrier
    parameter to restrict gradient variance. However, this prevalent restriction
    introduces a structural bias that precludes achieving exact feasibility. Fur-
    thermore, any theoretical attempt to extend classical continuous pure diffu-
    sion...

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  29. Mr Samriddhi Ghosh (Amity University Kolkata)

    The ideology of fuzzy mathematics was created to measure the quantities which
    cannot be measured usually by crisp set data values. But it fell short when parametric
    data containing two or more parameters was to be represented. To overcome this
    flaw, J.H. Park in 2004 introduced the ideology of Intuitionistic Fuzzy Metric Space,
    from the concepts of intuitionistic fuzzy set. For more than a...

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  30. Dr Ines ZIAD (Kasdi Merbah University of Ouargla)

    Abstract:
    This study investigates a multi-server queueing system with working vacations, waiting servers, and customer impatience. A Bernoulli schedule is considered to model the interruption of working vacations, during which customers are served at a lower service rate. The matrix-geometric method is employed to analyze the steady-state behavior of the system and derive several important...

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  31. Dr Dounya kechiche (University of Science and Technology Houari Boumediene, Algiers)

    In this study, we aim to model a current-actuated piezoelectric smart composite beam that is an elastic structure consisting of perfectly
    bonded piezoelectric, elastic and viscoelastic layers, taking into account the magnetic effect included in the modeling through a full set of Maxwell's equations. The new Lagrangian in this case for modeling is given by
    \begin{equation*}
    ...

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  32. Fatimah M. Alghamdi, Hassan M. Aljohani

    In this study, a novel lifetime model with two parameters has been proposed and studied for modeling more types data used in different case of studies including symmetric, asymmetric, skewed and complex data sets. The proposed model has been obtained by compounding the exponential and XLindley distributions, and it is regarded as strong competitor for widely applied symmetrical and non...

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  33. Mrs Ibtissam Kermiche (University Mohamed Cherif Messaadia Souk Ahras)

    Conjugate gradient (CG) methods are widely used in neural network training owing to their low memory requirements, although the classical Fletcher–Reeves (FR) method can converge slowly. In this work, we develop a modified FR-type CG algorithm in which a logistic mapping is applied to the FR coefficient and combined with the NPRP coefficient through a safeguarded parameter, ensuring that |β_j|...

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  34. Dr Radhowane Chaib (Cheikh Larbi Tbessi university)

    In this paper, we study fixed point results for $\varphi$-contractions on complete $b$-metric spaces. Under suitable assumptions on the comparison function $\varphi$, we establish two types of estimates for the convergence rate of the corresponding Picard iterative sequence. The obtained results are subsequently applied to Urysohn integral equations in the space of continuous functions...

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  35. B Mittou

    Throughout, we let $d_1 = 1 < d_2 < d_3 < \cdots < d_{\tau(n)} = n$ denote the increasing sequence of the divisors of a positive integer $n$. We define the arithmetic functions $\sigma_{e}$ and $\sigma_{o}$ by:
    \begin{equation}
    \sigma_{e}(n) = \sum_{i=1, \, 2 \mid i}^{\tau(n)} d_i \text{ and }\sigma_{o}(n) = \sum_{i=1, \, 2 \nmid i}^{\tau(n)} d_i.
    \end{equation
    }
    Note that the sequences...

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  36. bouanani oussama (University Of Mostaganem)

    This work proposes a kernel-based local linear estimator for functional regression in the
    presence of missing responses, under the assumption of missing at random . Our primary theoretical result is to establish the asymptotic normality of the proposed estimator. The finite sample performance of our approach is evaluated through an extensive simulation study, which
    confirms its practical...

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  37. Mr Mohammed El Amin Benane (Laboratery of Pure and Applied Mathematics, University of Laghouat, Laghouat 03000, Algeria.)

    This paper studies a nonlinear wave equation with a variable-exponent logarithmic source term, distributed delay, and fractional damping in the internal feedback: $u_{tt}-\Delta u+a_1u_t+\int_{t_1}^{t_2}a_2(\kappa)\partial_t^{\alpha,\eta}u(x,t-\kappa)\,\mathrm{d}\kappa=|u|^{q(x)-2}u\ln|u|$, for $(x,t)\in\Omega\times(0,\infty)$, where $\Omega\subset\mathbb{R}^n$ is a bounded domain, $2\le...

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  38. Mr Mamuda Tanimu (Federal Polytechnic Bali)

    The Study was on application of Particle Swarm Optimisation algorithm (PSOa) for tuning of a Proportional Integral Derivative (PID) control buck converter system. So many modern crucial devices power systems are sandwiched control systems for their effective operations. The popular and simple control methods remain the viable options because others are more complicated making implementation...

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  39. Dr Imane Mancer (Department of Mathematics, University of Mohamed Khider, Biskra, Algeria)

    This paper investigates a class of risk-sensitive stochastic optimal control problems formulated on the Wasserstein space, where the control consists of both continuous and impulsive components. The controlled dynamics and cost functional depend nonlinearly on the state process and its probability distribution and are described by mean-field forward-backward stochastic differential equations...

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  40. Mr Ahmed AKRIMI (Department of Mathematics, Faculty of Exact Sciences and Applied Sciences, Salhi Ahmed University Center of Naama, Algeria)

    We propose a local linear estimator of the conditional spectral density of a stationary time series with functional covariates and responses missing at random. The estimator uses a tapered local periodogram, correcting diagonal terms with individual inclusion probabilities and off-diagonal terms with joint inclusion probabilities. Under specified assumptions, we establish an almost-complete...

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  41. Dr Amina Bessam (Department of Mathematics, Khenchela University, Khenchela, Algeria)

    Mathematical models with time delays are useful for describing the effects of temporary immunity and delayed epidemiological processes. In this work, we consider a delayed epidemic reaction-diffusion model that incorporates two classes of individuals with different levels of disease awareness. We introduce a time delay to account for the temporary immunity period of recovered individuals, and...

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  42. Mr Bendjellal Houari charaf eddine (Institut des sciences Centre universitaire Nour Bachir El-Bayadh)

    We consider It\^o differential equations whose free evolution alternates with a prescribed impulse acting over an interval of positive duration. The objective is to quantify when these interventions produce a periodic probability law despite expansion during the free phase. The analysis combines the phase-composition estimates used for deterministic non-instantaneous impulsive equations with...

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  43. Mr atil abdelmadjid (LAMIS, Echahid Cheikh Larbi Tebessi University)

    We investigate a spatially heterogeneous reaction-diffusion HIV/AIDS model in which recruitment, natural mortality, disease progression, and transmission vary across space. In the reduced SIA framework considered here, the AIDS class is downstream of the infectious class, allowing the invasion mechanism to be reduced to a scalar self-adjoint spectral problem while retaining spatial demographic...

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  44. Dr Nabahats DIB-BAGHDADLI

    Spatial heterogeneity and time-dependent interfaces play a critical role in the persistence and distribution of populations in ecological and epidemiological systems. In this work, we extend classical reaction–diffusion models to heterogeneous domains separated by moving interfaces with dynamic transmission conditions. We establish the well-posedness of the resulting system using maximal...

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  45. Dr Thaícia Stona de Almeida (IGDORE)

    Open access (OA) publishing in Mathematics has expanded rapidly, yet systematic evidence on the scientific profile of OA mathematics journals remains limited. This study presents a scientometric analysis of mathematics journals indexed in the Directory of Open Access Journals (DOAJ) and matched to the SCImago Journal Rank (SJR) database. We examine SJR indices and citations per article across...

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  46. Mr Tarik REZAZGA (Laboratory of Mathematics, Modeling and Applications (LaMMA), Ahmed Draia University of Adrar, Algeria.)

    Abstract

    We consider the equation $u'+au=f$ on $\mathbb{R}$, where $a>0$ and $f$ is a real-valued Bohr almost periodic function, together with the backward Euler scheme

    $$ \frac{U_n^h-U_{n-1}^h}{h}+aU_n^h=f(nh), \qquad n\in\mathbb{Z},\quad h>0. $$ Let $u_f$ and $U_{h,f}$ denote the respective bounded solutions. Both are almost periodic. We determine the least constant $C_a(h)$ such...

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  47. Mr Mohammed Ahmed (Taraba State University Jalingo)

    The power system simplified representation is achieved using the single machine infinite bus (SMIB) systems. The main study objective is ascertaining the ability of the Grey Wolf Optimisation (GWO) algorithm in how well the performance of the Proportional Integral Derivative controller is enhanced for Single Machine Infinite Bus system. The GWO algorithm is an evolution based metaheuristic...

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  48. Dr Chahra Kechar (University of Mohamed Tahri Bechar)

    In the process we convert the given fractional differential equation into an equivalent integral equation. Then we construct appropriate mappings and employ the Krasnoselskii fixed point theorem and the method of upper and lower solutions to show the existence of a positive solution of this equation. We also use the Banach fixed point theorem to show the existence of a unique positive...

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  49. Dr Fatima Zohra HATHOUT (Higher School of Management Tlemcen, Laboratoire d'Analyse Nonlinéaire et Mathématiques Appliquées, University of Tlemcen, Tlemcen 13000, Algeria)

    In this paper, we consider the influence of imperfect vaccination on the spread of infectious diseases in an age-structured population. The benefits of vaccination, even if not perfect, generally outweigh the risks of severe diseases. In a mathematical system, we consider the compartment of susceptible s, vaccinated v and infected i individuals with an age structure. The proposed model is...

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  50. Dr Mehsin Jabel Atteya (Mustansiriyah University, College of Education, Department of Mathematics)
    Algebra

    In this paper, we first introduce the notion of D-homoderivations in Lie algebras, which includes establishing explicit structural results for D-homoderivations in Lie algebras over arbitrary fields. It shows that the set of D-homoderivations forms a Lie algebra that decomposes into the sum of derivations and centroids, with their intersection precisely equal to the space of central...

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  51. Dr Fatna bensaber (University of Tlemcen)

    Functional autoregressive (FAR) processes have become an important methodological tool in functional data analysis (FDA), particularly for modeling and forecasting observations represented by continuous curves or time-dependent functions. In contrast to conventional autoregressive models, which are designed for scalar or finite-dimensional vector observations, FAR models consider each...

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  52. Dr Meriem Boubalou (University of Tipaza, Faculty of Science, 42020, Tipaza, Algeria.)

    This paper presents a comparative study of three sampling techniques for Monte Carlo simulation of a single-server queueing system subject to catastrophes, control times, batch service, and multiple vacations. The proposed simulation framework employs random sampling, Latin Hypercube Sampling, and Refined Descriptive Sampling to estimate the system's main performance measures, particularly for...

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  53. Prof. Mohammed Abdelmalek (Higher school of management of Tlemcen)

    In this paper, we introduce an study the weighted linearized operator L_k associated with the k-elementary symmetric functions ?sigma_k. By deriving new variational formulae, we establish a rigidity theorem for closed strictly convex hypersurfaces with contant ?sigma_2 curvature in weighted space forms.

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  54. Mrs Neda Rouabhia (University of Souk Ahras)

    In this manuscript, we consider a beam model called the Shear beam model (no rotary inertia) with a second sound. First, we establish well-posedness findings by applying the Faedo-Galerkin method, and by constructing an appropriate Lyapunov functional, we show exponential decay findings for the solutions of the system. Furthermore, our obtained findings are not related to any relationship...

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  55. Ms Baya Djoubir (Department of Mathematics, University of Abou Bekr Belkaïd Tlemcen, Algeria)

    In this work, We investigate the existence and uniqueness of μ-pseudo almost automorphic solutions for a class of abstract two-term fractional differential equations in Banach spaces. Such equations play an important role in modeling complex phenomena arising in physics, engineering, and dynamical systems with memory and hereditary effects.

    The main objective is to introduce and study the...

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