Seridi Abir, Benhamdi Naima(University of Guelma, 2025)
This work is dedicated to the study of the effect of olive leaf extract (OL), marjoram oregano
(MO), and their mixture (OL, MO) as green inhibitors on the corrosion of A9 steel in an acidic
medium (1M HCl), using ...
The analysis of the structural, electronic, and optical properties of pure gallium nitride (GaN) and GaN doped with aluminium (Al) and tallium (Tl) was carried out using the FP-LAPW method. The generalized gradient ...
A comprehensive study was conducted on the structural, electronic, vibrational and dielectric properties of the semiconductor compound LiBeP within the framework of density functional theory (DFT). We employed the ...
The process of hydrogen production from water using two-dimensional (2D) materials represents a vital research field for the development of clean and sustainable energy sources. This study aims to explore the structural ...
Hydrogen storage is a major challenge in developing clean energy technologies, leading to growing interest in two-dimensional (2D) materials due to their unique structural and electronic properties. This work presents a ...
In this work, we studied the structural, elastic, and thermodynamic properties of the compounds Li_2TiBr_6 and Na_2TiBr_6 using Density Functional Theory (DFT). The calculations were performed using the Generalized Gradient ...
In this work, we studied the structural, electronic, and vibrational properties of the LiBeAs compound in its tetragonal (Cu2Sb-type) and hexagonal (LiGaGe-type) phases, using ab initio calculations based on density ...
This master’s thesis analyzes the structural, electronic, and optical properties of GeS2 , GeO2 , and Janus GeSO monolayers in their trigonal crystalline form. Calculations, performed within the framework of density ...
The intention of this memoir is to analyze the relationship between the dynamics of limit cycles in planar di¤erential systems ( _ x = P (x; y) _ y = Q (x; y)) and the analytical properties of generalized Riccati equations. ...
In this work, we consider the limit cycles of a class of polynomial differential systems of the form {<K1.1/>┊ <K1.1 ilk="MATRIX" > u=v-ε(g₁¹(u)+f₁¹(u)v)-ε²(g₁²(u)+f₁²(u)v), v=-u-ε(g₂¹(u)+f₂¹(u)v)-ε²(g₂²(u)+f₂²(u)v), ...
BELHIRECHE, Nor el houda(University of Guelma, 2025)
n this thesis, we study a particular class of nonlinear Volterra integrodifferential equations with delay. Such equations are used to model dynamic phenomena that depend on the system’s history as well as a delayed term. ...
BENABDELHAFID, BOUTHEYNA(University of Guelma, 2025)
This study employs the one-dimensional shooting method to numerically solve a boundary value problem (BVP) governed by an ordinary differential equation (ODE). Such BVPs arise in diverse scientific and engineering domains, ...
MENASRIA, ABDEL MAMOUNE(University of Guelma, 2025)
This thesis focuses on the existence and mass concentration behavior of minimizers for rotating Bose-Einstein condensates (BEC) with attractive interactions in a bounded domain D⊂R^ 2 . It is shown that there exists a ...
This thesis presents a novel numerical approach for solving nonlinear Fredholm integro-differential equations involving both the unknown function and its derivative. The proposed method combines the backward finite difference ...
In this work, we investigate the controllability of a class of fractional systems in the Ψ-Caputo
sense with nonlocal initial conditions.
First, we establish the existence and uniqueness of solutions by applying the ...
This thesis falls within the framework of studying fractional differential equations.
This subject was inspired by the work of A. Berhail, N. Tabouche, M.M. Matar and J.
Alzabut, article [9] on which Belaadi, and Benkamouche ...
This work focuses on modeling the movement of air while accounting for the condensation of water vapor, using equations derived from fluid mechanics. These equations are nonlinear and generally do not admitanalytical ...
The aim of this thesis is to solve some ordinary and fractional differential
equations using the Laplace transformation associated with fractional calculus.
Keywords: Fractional calculus, fractional derivative for ...
Fractional delay differential equations constitute a powerful mathematical framework
for modeling complex dynamical phenomena exhibiting memory and delay effects. In
this study, we investigate a class of fractional delay ...