Results 141 to 150 of about 82,530 (235)

Nonlinear Amplitude Maxwell-Dirac Equations. Optical Leptons

, 2003
We apply the method of slowly-varying amplitudes of the electrical and magnet fields to integro-differential system of nonlinear Maxwell equations. The equations are reduced to system of differential Nonlinear Maxwell amplitude Equations (NME). Different orders of dispersion of the linear and nonlinear susceptibility can be estimated. This method allow
openaire   +2 more sources

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

The Critical Role of the Intermittent Two‐Phase Flow Topology on the Solute Dispersion in Partially Saturated Porous Media

Water Resources Research, Volume 62, Issue 2, February 2026.
Abstract Intermittent flow is a widely recognized phenomenon across various fields, characterized by the spatial‐temporal fluctuations of the two‐phase topology. However, its implications for solute dispersion and mixing remain insufficiently understood.
Kai Zhang, Chunwei Zhang, Zijing Li, Kai Zhao, Ming Li, Tetsuya Suekane   +5 more
wiley   +1 more source

An Effective Monitoring of Evolving Groundwater Drought via Multivariate Data Assimilation and Machine Learning

Water Resources Research, Volume 62, Issue 2, February 2026.
Abstract Groundwater drought represents one of the most pervasive and difficult‐to‐monitor forms of water scarcity, threatening the reliability of freshwater supply for over 2 billion people worldwide, agricultural productivity, and ecosystem health.
Parnian Ghaneei, Hamid Moradkhani
wiley   +1 more source

Role of Dead‐End Regions and Transmitting Pores in Mixing and Reactivity in Unsaturated Porous Media

Water Resources Research, Volume 62, Issue 2, February 2026.
Abstract Mixing‐limited reactions in unsaturated porous media are controlled by complex pore‐scale processes arising from air and water phases coexistence. Decreasing water saturation increases flow heterogeneity, creating preferential flow paths and dead‐end regions (DER) that alter solute distribution and reaction efficiency.
Saif Farhat, Guillem Sole‐Mari, Diogo Bolster   +2 more
wiley   +1 more source

Boundary spike‐layer solutions of the multi‐dimensional singular Keller–Segel system: Existence, profiles and stability

Proceedings of the London Mathematical Society, Volume 132, Issue 2, February 2026.
Abstract This paper investigates boundary‐layer solutions of the singular Keller–Segel system (proposed in Keller and Segel [J. Theor. Biol. 30 (1971), 377–380]) in multi‐dimensional domains, which describes cells' chemotactic movement toward the concentration gradient of the nutrient they consume, subject to a zero‐flux boundary condition for the cell
Jose A. Carrillo, Jingyu Li, Zhi‐An Wang, Wen Yang   +3 more
wiley   +1 more source

Stochastic Resonance Elucidates the Emergence and Periodicity Transition of Glacial Cycles

Geophysical Research Letters, Volume 53, Issue 1, 16 January 2026.
Abstract Glacial cycles emerged with a 41‐kyr period after the Pliocene and later intensified with a 100‐kyr period in the mid‐Pleistocene, which were attributed to Earth's orbital variations. However, no significant changes in the orbital forcing were found at the two transitions, and the forcing was too small to drive these cycles. Here, a stochastic
Tian Xu, Gabriel Katul, Shineng Hu
wiley   +1 more source

Effect of Submerged Vegetation on Water Surface Geometry and Air–Water Momentum Transfer

Geophysical Research Letters, Volume 53, Issue 1, 16 January 2026.
Abstract Understanding how submerged vegetation modifies the water surface is crucial for modeling momentum exchange between shallow waters and the atmosphere. In particular, quantifying its impact on the equivalent aerodynamic roughness of the water surface is essential for improved boundary‐layer parameterization in oceanic and atmospheric models. In
G. Foggi Rota, A. Chiarini, M. E. Rosti
wiley   +1 more source

Closed-form spin-relativistic corrections from the Dirac equation enabling a modified Schrödinger solver. [PDF]

Sci Rep
Amaro MB, Nazeef, Dussech CJ, Qi C.
europepmc   +1 more source

Exploring potential hidden aspects of quantum field theory through numerical solution of the Klein-Gordon equation using the Yee algorithm. [PDF]

Sci Rep
Honarbakhsh B.
europepmc   +1 more source