Results 111 to 120 of about 1,998,384 (219)
AIMS MathematicsIn this study, changes in westerly waves and their connections to increased global warming under the influence of greenhouse gases were investigated via a Caputo fractional four-dimensional atmospheric system.
Asharani J. Rangappa +4 more
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Limit Cycle Bifurcations from a Nilpotent Focus or Center of Planar Systems
Abstract and Applied Analysis, 2012 We study analytic properties of the Poincaré return map and generalized focal values of analytic planar systems with a nilpotent focus or center. We use the focal values and the map to study the number of limit cycles of this kind of systems and obtain ...
Maoan Han, Valery G. Romanovski
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All‐Fiber Microsensor of Polarization at Single‐Photon Level Aided by Deep Learning
Laser &Photonics Reviews, Volume 20, Issue 3, 5 February 2026.Introducing a polarization sensor using scattering in a short optical fiber and deep learning. The breakthrough lies in sparse sampling of the scattered light and single‐photon sensitivity. The all‐fiber sensor achieves unprecedented accuracy, speed, resolution, and stability.
Martin Bielak +2 more
wiley +1 more source
APPLICATION OF STROBOSCOPIC POINCARE MAP FOR ROTOR SYSTEM INTERFACE NODE DEFECTS DIAGNOSIS
Advanced Engineering Research, 2011 The application of stroboscopic Poincare map for the recovery of normal path of dynamic system motion in case of peak additive disturbance and in absence of a priori data on frequency of restorable signal is considered.
Mikhail V. Chuveyko
doaj
Infinitely Many Periodic Solutions of Duffing Equations with Singularities via Time Map
Abstract and Applied Analysis, 2014 We study the periodic solutions of Duffing equations with singularities x′′+g(x)=p(t). By using Poincaré-Birkhoff twist theorem, we prove that the given equation possesses infinitely many positive periodic solutions provided that g satisfies the singular
Tiantian Ma, Zaihong Wang
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Solvability of invariant systems of differential equations on H2$\mathbb {H}^2$ and beyond
Mathematische Nachrichten, Volume 299, Issue 2, Page 456-479, February 2026.Abstract We show how the Fourier transform for distributional sections of vector bundles over symmetric spaces of non‐compact type G/K$G/K$ can be used for questions of solvability of systems of invariant differential equations in analogy to Hörmander's proof of the Ehrenpreis–Malgrange theorem.
Martin Olbrich, Guendalina Palmirotta
wiley +1 more source
Online regularization of Poincaré map of storage rings with Shannon entropy
Physical Review Accelerators and BeamsA measurable chaos indicator is used as the online optimization objective in tuning a complicated nonlinear system—the National Synchrotron Light Source-II storage ring.
Yongjun Li +9 more
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Skyrmionic Polarization Textures in Structured Dielectric Planar Media
Nanophotonics, Volume 15, Issue 3, 12 February 2026.Topological skyrmionic textures are typically associated with the structure of optical fields. This work demonstrates that they can also emerge from the optical response of structured metasurfaces. Through engineered light–matter interaction, polarization eigenstates acquire nontrivial topology, which can be mapped into the Chern‐insulator physics ...
Francesco Di Colandrea +2 more
wiley +1 more source
Nanophotonics, Volume 15, Issue 3, 12 February 2026.Based on an all‐dielectric metasurface with cross‐phase modulation, we achieve the generation and polarization control of integers and fractional order irregular perfect vector vortex beams on the hybrid Poincaré sphere, opening a new avenue for optical field manipulation.
Xiaojie Sun +7 more
wiley +1 more source
A general approach to the linear stability of viscoelastic shear‐flows
ZAMM - Journal of Applied Mathematics and Mechanics / Zeitschrift für Angewandte Mathematik und Mechanik, Volume 106, Issue 2, February 2026.Abstract The present work provides an in‐depth analysis of the linear stability theory of viscoelastic shear‐flows, based upon a constitutive equation of the fading memory type. The particular model considered herein was introduced by Kenneth Walters through the integration of classical rate‐type fluids in a convected frame (Walters 1962).
Johannes Conrad, Martin Oberlack
wiley +1 more source