Browsing by Author "Pinelas, Sandra"

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A Coupled Nonlinear System of Integro-Differential Equations Using Modified Abc Operator
(World Scientific Publ Co Pte Ltd, 2025) Khan, Hasib; Alzabut, Jehad; Almutairi, D. K.; Alqurashi, Wafa khalaf; Pinelas, Sandra; Tunc, Osman; Azim, Mohammad athar
This paper explores the necessary conditions required for the solutions of an integro-differential system of n-fractional differential equations (n-FDEs) in the modified-ABC case of derivative with initial conditions. The presumed problem is a linearly perturbed system. Some classical fixed point theorems are utilized to derive the solution existence criteria. Additionally, a numerical methodology utilizing Lagrange's interpolation polynomial is developed and implemented in a dynamical framework of a power system for practical applications. In addition, we investigate the properties of Hyers-Ulam's stability and uniqueness. The findings are evaluated using graphical methods to assess the precision and suitability of the approaches
Existence and Stabilization for Impulsive Differential Equations of Second Order With Multiple Delays
(Texas State Univ, 2024) Pinelas, Sandra; Tunc, Osman; Korkmaz, Erdal; Tunc, Cemil
Existence and stability of solutions are important parts in the qualitative study of delay differential equations. The stabilizing by imposing proper impulse controls are used in many areas of natural sciences and engineering. This article provides sufficient conditions for the existence and exponential stabilization of solutions to delay impulsive differential equations of second-order with multiple delays. The main tools in this article are the Schaefer fixed point theorem, fixed impulse effects, and Lyapunov-Krasovskii functionals. The outcomes extend earlier results in the literature.
Solution Estimates and Stability Tests for Nonlinear Delay Integro-Differential Equations
(Texas State Univ, 2022) Pinelas, Sandra; Tunc, Osman
In this article, we examine various qualitative features of solutions of a nonlinear delay integro-differential equation. We prove three new theorems which include sufficient conditions on asymptotic stability (AS), integrability, and boundedness of solutions, using a suitable Lyapunov-Krasovskii functional. We present examples that show applications of our results.