Results 61 to 70 of about 1,207 (185)

On a Partial q-Analog of a Singularly Perturbed Problem with Fuchsian and Irregular Time Singularities

open access: yesAbstract and Applied Analysis, 2020
A family of linear singularly perturbed difference differential equations is examined. These equations stand for an analog of singularly perturbed PDEs with irregular and Fuchsian singularities in the complex domain recently investigated by A. Lastra and
Stephane Malek
doaj   +1 more source

Pattern Formation and Nonlinear Waves Close to a 1:1 Resonant Turing and Turing–Hopf Instability

open access: yesStudies in Applied Mathematics, Volume 155, Issue 5, November 2025.
ABSTRACT In this paper, we analyze the dynamics of a pattern‐forming system close to simultaneous Turing and Turing–Hopf instabilities, which have a 1:1 spatial resonance, that is, they have the same critical wave number. For this, we consider a system of coupled Swift–Hohenberg equations with dispersive terms and general, smooth nonlinearities.
Bastian Hilder, Christian Kuehn
wiley   +1 more source

Observation of Magnetic Pseudogap Behavior in Phosphorus‐Doped Silicon

open access: yesAdvanced Science, Volume 12, Issue 39, October 20, 2025.
Phosphorus‐doped silicon presents a promising platform for quantum computing and hosts a Kondo condensate state featuring a pseudogap. Thermodynamic and magnetic resonance measurements reveal that this pseudogap behavior involves critical spin fluctuations, suggesting that overlapping Kondo clouds form a correlated coherent magnetic ground state ...
Suheon Lee   +16 more
wiley   +1 more source

Current Practices for Analyzing Soils and Sediments via Mössbauer Spectroscopy

open access: yesJournal of Plant Nutrition and Soil Science, Volume 188, Issue 5, Page 742-773, October 2025.
ABSTRACT Environmental scientists are increasingly returning to Mössbauer spectroscopy (MBS) to reveal details about iron (Fe)‐bearing phases in soils and sediments. MBS is particularly powerful at distinguishing between Fe(II) and Fe(III) and, given appropriate background information, can offer exceptionally precise information on Fe speciation in ...
Aaron Thompson   +9 more
wiley   +1 more source

Multiplicity and concentration behaviour of solutions for a fractional Choquard equation with critical growth

open access: yesAdvances in Nonlinear Analysis, 2020
In this paper, we study the singularly perturbed fractional Choquard ...
Yang Zhipeng, Zhao Fukun
doaj   +1 more source

Asymptotic estimates of the solution for a singularly perturbed Cauchy problem

open access: yesҚарағанды университетінің хабаршысы. Математика сериясы
The article focuses on the initial problem for a third-order linear integro-differential equation with a small parameter at the higher derivatives, assuming that the roots of the additional characteristic equation have opposite signs.
N.U. Bukanay   +2 more
doaj   +1 more source

Septic B-spline method for second order self-adjoint singularly perturbed boundary-value problems

open access: yesAin Shams Engineering Journal, 2018
In the present paper, we develop a septic B-spline method for solving a self-adjoint singularly perturbed two-point boundary value problem. This method is applied directly to the numerical solution of the problems without reducing its order.
Ram Kishun Lodhi, Hradyesh Kumar Mishra
doaj   +1 more source

The Contrast Structures for a Class of Singularly Perturbed Systems with Heteroclinic Orbits

open access: yesDiscrete Dynamics in Nature and Society, 2016
Singularly perturbed problems are often used as the models of ecology and epidemiology. In this paper, a class of semilinear singularly perturbed systems with contrast structures are discussed.
Han Xu, Yinlai Jin
doaj   +1 more source

Uniform asymptotic expansion of the solution for the initial value problem with a piecewise constant argument

open access: yesҚарағанды университетінің хабаршысы. Математика сериясы
The article is devoted to the study of a singularly perturbed initial problem for a linear differential equation with a piecewise constant argument second-order for a small parameter.
A.E. Mirzakulova, K.T. Konisbayeva
doaj   +1 more source

Singularly perturbed variational problems

open access: yesJournal of Mathematical Analysis and Applications, 1992
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
openaire   +2 more sources

Home - About - Disclaimer - Privacy