Results 111 to 120 of about 8,845 (277)
Dual Variational Problems and Action Principles for Chen–Lee and Hopf–Langford Systems
Mathematical Methods in the Applied Sciences, Volume 49, Issue 4, Page 2456-2462, 15 March 2026.ABSTRACT We describe the construction of dual variational principles and action functionals for nonlinear dynamical systems using a methodology based on the dual Lagrange multiplier formalism and a convex optimization approach, to derive families of dual actions that correspond to the given nonlinear ordinary differential system.
A. Ghose‐Choudhury, Partha Guha
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Electronic Journal of Qualitative Theory of Differential Equations, 2010 In this paper, we study a class of nonlinear Duffing equations with a deviating argument and establish some sufficient conditions for the existence of positive almost periodic solutions of the equation.
Lequn Peng, Wentao Wang
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Ninety years of Duffing’s equation
Theoretical and Applied Mechanics, 2013 In the paper the origin of the so named ?Duffing?s equation? is shown. The author?s generalization of the equation, her published papers dealing with Duffing?s equation and some of the solution methods are presented. Three characteristic approximate solution procedures based on the exact solution of the strong cubic Duffing?s equation are ...
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Linearized Homotopy Perturbation Method for Two Nonlinear Problems of Duffing Equations
, 2021 Chein‐Shan Liu
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C∞‐Structures for Liénard Equations and New Exact Solutions to a Class of Klein–Gordon Equations
Mathematical Methods in the Applied Sciences, Volume 49, Issue 4, Page 2795-2822, 15 March 2026.ABSTRACT Liénard equations are analyzed using the recent theory of 𝒞∞‐structures. For each Liénard equation, a 𝒞∞‐structure is determined by using a Lie point symmetry and a 𝒞∞‐symmetry. Based on this approach, a novel method for integrating these equations is proposed, which consists in solving sequentially two completely integrable Pfaffian equations.
Beltrán de la Flor +2 more
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Chaos and limit cycle in Duffing's equation
Journal of the Franklin Institute, 1990 The authors present in several figures the chaotic behavior and the limit cycles which correspond to different values of parameters entering Duffing's equation.
Ku, Y. H., Sun, Xiaoguang
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Evaluation of forage grass response to nitrogen rate in a controlled greenhouse study
Agrosystems, Geosciences &Environment, Volume 9, Issue 1, March 2026.Abstract Productive forage with sufficient nutritive value is essential to profitable grazing operations. Application of nitrogen (N) fertilizer directly impacts pasture growth, but N rates must be carefully calibrated to minimize production costs and losses to the environment.
Alison J. Duff +3 more
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Homotopy perturbation method with an auxiliary parameter for nonlinear oscillators
Journal of Low Frequency Noise, Vibration and Active Control, 2019 A brief introduction to the development of the homotopy perturbation method is given, and the main milestones are elucidated with more than 90 references.
Dan-Ni Yu, Ji-Huan He, Andres G Garcıa
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Positive periodic solution for p-Laplacian neutral damped Duffing equation with strong singularities of attractive and repulsive type [PDF]
, 2019 Shao-Wen Yao, Xiao-Zhong Zhang
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Appreciative Inquiry in the Workplace: A Review of (Quasi) Experimental Studies
Canadian Journal of Administrative Sciences / Revue Canadienne des Sciences de l'Administration, Volume 43, Issue 1, March 2026.ABSTRACT The objective of this study is to review the literature of (quasi) experimental studies on appreciative inquiry (AI) in the workplace. We present an overview of the AI approach, a summary of four main purported AI outcomes in organizations (generativity, engagement and performance, team‐oriented behaviours, and virtuousness and flourishing ...
Marine Miglianico +4 more
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