Results 51 to 60 of about 5,872 (126)

Fractal formation and chaotic soliton phenomena in nonlinear conformable Heisenberg ferromagnetic spin chain equation

Open Physics
The present study constructs and investigates solitonic phenomena in the complex structured (3+1)-dimensional conformable Heisenberg ferromagnetic spin chain equation (CHFSCE).
Ali Rashid, Imtiaz Rabia, Junjua Moin-ud-Din, Awwad Fuad A., Ismail Emad A. A., Hendy Ahmed S.   +5 more
doaj   +1 more source

Diversity of solitary wave structures in Kerr media: Analyzing the complex paraxial wave equation in fiber optic communication systems

Ain Shams Engineering Journal
This study explores the paraxial nonlinear Schrödinger equation in Kerr media, a key model for optical fiber systems. Complex wave transformations reduce the model to a nonlinear ODE, enabling the generation of diverse solutions: bright, dark, bright ...
U. Younas, J. Muhammad, H.F. Ismael, Tukur Abdulkadir Sulaiman, Homan Emadifar, Karim K. Ahmed   +5 more
doaj   +1 more source

Low‐Energy Atomic Scattering: S‐Wave Relation Between the Interaction Potential and the Phase Shift

Annalen der Physik, Volume 537, Issue 11, November 2025.
The validity of the on‐shell approximation for s‐wave scattering is examined across one, two, and three dimensions using exactly solvable model interaction potentials. By comparing exact and approximate s‐wave components of the interaction potential, the analysis reveals that the approximation improves with increasing momentum and decreasing ...
Francesco Lorenzi, Luca Salasnich
wiley   +1 more source

Optimal Adaptive Reinforcement Learning Control for a Convection‐Reaction Distributed Parameter System

Optimal Control Applications and Methods, Volume 46, Issue 6, Page 2384-2395, November/December 2025.
Optimal adaptive reinforcement learning control using an actor‐critic architecture. The controller learns optimal control policies online from data measured along the trajectories of a plug flow system ABSTRACT This article is devoted to optimal adaptive control for a distributed parameter convection‐reaction system by reinforcement learning (RL ...
Abdellaziz Binid, Ilyasse Aksikas
wiley   +1 more source

Numerical integration of asymptotic solutions of ordinary differential equations [PDF]

Classical asymptotic analysis of ordinary differential equations derives approximate solutions that are numerically stable. However, the analysis also leads to tedious expansions in powers of the relevant parameter for a particular problem.
Thurston, Gaylen A.
core   +1 more source

The 1/N Expansion in Noncommutative Quantum Mechanics

, 2010
We study the 1/N expansion in noncommutative quantum mechanics for the anharmonic and Coulombian potentials. The expansion for the anharmonic oscillator presented good convergence properties, but for the Coulombian potential, we found a divergent large N
A. F. Ferrari, A. V. Koudinov, A. V. Manohar, C. A. Stechhahn, Ch. Moseley, J. Maldacena, M. Gomes, S. Coleman   +7 more
core   +1 more source

Optimal Liquidation With Signals: The General Propagator Case

Mathematical Finance, Volume 35, Issue 4, Page 841-866, October 2025.
ABSTRACT We consider a class of optimal liquidation problems where the agent's transactions create transient price impact driven by a Volterra‐type propagator along with temporary price impact. We formulate these problems as maximization of a revenue‐risk functionals, where the agent also exploits available information on a progressively measurable ...
Eduardo Abi Jaber, Eyal Neuman
wiley   +1 more source

Falkner–Skan equation for bi‐viscosity nanofluid flow over a stretching wedge surface and suction/injection

ZAMM - Journal of Applied Mathematics and Mechanics / Zeitschrift für Angewandte Mathematik und Mechanik, Volume 105, Issue 9, September 2025.
Abstract Traditional fluids have low thermal conductivity and their utility in engineering is well established. Hence, in order to enhance heat transfer features in a variety of disciplines, notably electronics, medicine, and molten metals, scientists and researchers have developed nanofluids, which are composed of nanoparticles dispersed in a base ...
Ulavathi Shettar Mahabaleshwar, Thippaiah Maranna, Nedunchezhian Swaminathan, Laura Miller, Raimondo Penta   +4 more
wiley   +1 more source

On Bureau's Classification of Quadratic Differential Equations in Two Variables Free of Movable Critical Points

Studies in Applied Mathematics, Volume 155, Issue 2, August 2025.
ABSTRACT As part of the efforts aimed at extending Painlevé and Gambier's work on second‐order equations in one variable to first‐order ones in two, in 1981, Bureau classified the systems of ordinary quadratic differential equations in two variables which are free of movable critical points (which have the Painlevé Property).
Adolfo Guillot
wiley   +1 more source

A Contraction Analysis of the Convergence of Risk-Sensitive Filters

, 2013
A contraction analysis of risk-sensitive Riccati equations is proposed. When the state-space model is reachable and observable, a block-update implementation of the risk-sensitive filter is used to show that the N-fold composition of the Riccati map is ...
Levy, Bernard C., Zorzi, Mattia
core