Results 121 to 130 of about 6,600 (212)
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
wiley +1 more source
Multiple positive solutions for elliptic problem with concave and convex nonlinearities
Electronic Journal of Differential Equations, 2015 In this article, we consider the existence of multiple solutions to the elliptic problem $$\displaylines{ -\Delta u=\lambda u^q+u^s+\mu u^p\quad \text{in } \Omega,\cr u>0\quad \text{in } \Omega,\cr u=0\quad \text{on } \partial\Omega, }$$ where ...
Jiayin Liu, Lin Zhao, Peihao Zhao
doaj
Adaptable Tile‐Based Pneumatic Origami through Structurally Coupled Localized Actuation
Advanced Engineering Materials, Volume 28, Issue 5, 4 March 2026.This article presents tile‐based pneumatic origami structures with rigid tiles and flexible fabric creases, achieving adaptable properties including morphing shape, selective multistability, and tunable stiffness. Independently pressurized folding bladders at each crease enable structurally coupled localized actuation of origami structures.
Tiantian Li, Jonathan Luntz, Diann Brei
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Exact Multiplicity of Positive Solutions for Convex-Concave-Convex Nonlinearities
Advances in Applied Mathematics, 2017 本文研究了具有凸-凹-凸非线性项的狄利克雷边值问题正解的分支曲线。通过时间映射分析法，证明了在非线性项为渐近次线性时，边值问题的正解分支曲线为S-型曲线，从而确定了边值问题的正解的确切个数。 In this paper we study the bifurcation curve of the Dirichlet boundary value problem with convex- concave-convex nonlinearities. By using Time-map techniques, we prove that the bifurcation curve of the boundary value problem is S-shaped when the ...
openaire +1 more source
Engineering Reports, Volume 8, Issue 3, March 2026.This study carefully examines the mixed convection heat transport properties of a water–Al2O3 nanofluid inside a corrugated chamber with heated baffles in the shape of a star. The effects of different Rayleigh numbers, nanoparticle volume fractions, and baffle placement are carefully evaluated, and the cavity is subjected to buoyancy forces. The finite
Rabia Salma +4 more
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Multiple positive solutions for Schrodinger-Poisson systems involving concave-convex nonlinearities
Electronic Journal of Differential Equations, 2019 In this article, we study the existence of multiple positive solutions for Schrodinger-Poisson systems involving concave-convex nonlinearities and sign-changing weight potentials.
Haining Fan
doaj
Electronic Journal of Differential Equations, 2020 In this article, using Nehari manifold method we study the multiplicity of solutions of the nonlocal elliptic system involving variable exponents and concave-convex nonlinearities, $$\displaylines{ (-\Delta)_{p(\cdot)}^{s} u=\lambda a(x)| u|^{q(x ...
Reshmi Biswas, Sweta Tiwari
doaj
Geochemistry, Geophysics, Geosystems, Volume 27, Issue 3, March 2026.Abstract Marine sediments contain magnetic mineral particles of detrital, biogenic and authigenic origin that record changes in the direction and intensity of the geomagnetic field over geological time. Previous studies have demonstrated that the recording efficiencies of detrital and biogenic magnetite differ.
Kuang He +8 more
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Topographic Scattering of Internal Waves in the Presence of a Steady Surface Current
Journal of Geophysical Research: Oceans, Volume 131, Issue 3, March 2026.Abstract Wave–topography interaction is one of the primary mechanisms through which internal wave energy cascades to small length scales, eventually leading to turbulent diffusion and mixing in the oceans. Precise diffusivity parametrizations are crucial for modeling oceanic flows accurately.
Saranraj Gururaj, Anirban Guha
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Study on the fastening characteristics of preformed helical fittings considering the surface effect of transmission lines. [PDF]
Sci Rep, 2023 Zhongbin L +9 more
europepmc +1 more source