Results 111 to 120 of about 12,177,110 (235)

Data‐Driven Discovery of Classical and Anomalous Transport Models From Sparse Breakthrough Curves in Heterogeneous Porous Media via Symbolic Regression

Journal of Geophysical Research: Machine Learning and Computation, Volume 3, Issue 6, December 2026.
Abstract Natural porous media are highly heterogeneous, with flow and transport controlled by pore‐space morphology and connectivity. Consequently, classical continuum models often fail to describe observed transport under strong heterogeneity. A key challenge is identifying physically interpretable transport models from sparse observational data.
Jinwoo Im, Felipe P. J. de Barros, Sami Masri, Muhammad Sahimi   +3 more
wiley   +1 more source

Nonlocal boundary value problem for second order abstract elliptic differential equation

Abstract and Applied Analysis, 1999
We establish conditions that guarantee Fredholm solvability in the Banach space Lp of nonlocal boundary value problems for elliptic abstract differential equations of the second order in an interval.
Mohamed Denche
doaj   +1 more source

Fragmentation–Coagulation Processes With Advection or Diffusion in Space

Mathematical Methods in the Applied Sciences, Volume 49, Issue 17, Page 17952-17982, 30 November 2026.
ABSTRACT In this paper, we consider a continuous fragmentation–coagulation model in which the reacting particles can be transported in physical space through either advection or diffusion. We prove new results on the generation of C0‐semigroups with parameter and use them to show that the abstract Cauchy problem associated with a more general version ...
Jacek Banasiak, Nduduzo Majozi
wiley   +1 more source

Nonlocal boundary-value problems for n-th order ordinary differential equations by matching solutions

Electronic Journal of Differential Equations, 2011
We are concerned with the existence and uniqueness of solutions to nonlocal boundary-value problems on an interval $[a,c]$ for the differential equation $y^{(n)}=f(x,y,y',dots,y^{(n-1)})$, where $ngeq 3$.
Xueyan Liu
doaj  

A Two-Dimensional Nonlocal Fractional Parabolic Initial Boundary Value Problem

Axioms
In this paper, we investigate a two-dimensional singular fractional-order parabolic partial differential equation in the Caputo sense. The partial differential equation is supplemented with Dirichlet and weighted integral boundary conditions.
Said Mesloub, Eman Alhazzani, Hassan Eltayeb Gadain   +2 more
doaj   +1 more source

Tensor‐Train Compression of a Volume Integral Eddy Current Problem in Discontinuous Galerkin

International Journal for Numerical Methods in Engineering, Volume 127, Issue 21, 15 November 2026.
ABSTRACT The paper presents a low‐rank tensor compression strategy based on the tensor‐train (TT) format for the integral operator arising in eddy current problems. Unlike classical matrix compression techniques such as the fast multipole method (FMM) or hierarchical matrices (ℋ$$ \mathscr{H} $$‐matrices), which typically compress only far‐field ...
Anthony Torosyan, Bertrand Bannwarth, Olivier Chadebec, Jean‐Michel Guichon, Gérard Meunier, Jean‐René Poirier   +5 more
wiley   +1 more source

Mechanistic Insights Into Zn‐Promoted CO2 Electroreduction on α‐CuZn Alloys in Aprotic Media

ChemSusChem, Volume 19, Issue 21, 12 November 2026.
Elucidating nonaqueous CO2 reduction: Zinc boosts copper activity by tuning surface interactions for improved CO2 activation. How Zn enhances the performance of Cu electrocatalysts for CO2${\mathrm{CO}}_{2}$RR in nonaqueous electrolytes remains an open question.
Niklas Oppel, Liana Savintseva, Philipp Röse, Georg Kastlunger, Felix Studt, Ulrike Krewer   +5 more
wiley   +1 more source

Global existence of solutions of initial boundary value problem for nonlocal parabolic equation with nonlocal boundary condition

We prove the global existence and blow-up of solutions of an initial boundary value problem for nonlinear nonlocal parabolic equation with nonlinear nonlocal boundary condition.
Gladkov A., Kavitova T.
core   +1 more source

Quantum Thermodynamic Transformation Optics: A Unified Framework for Energy and Entropy With Application to the Casimir Force in Dissipative Metamaterials

Nanophotonics, Volume 15, Issue 21, 12 November 2026.
Geometry in transformation optics can be extended to control quantum–thermal fluctuations, enabling redistribution of energy, entropy, and Casimir pressure in dissipative metamaterials. ABSTRACT A novel concept, quantum thermodynamic transformation optics (QTTO), is introduced as a theoretical framework integrating transformation optics with ...
Mohammad Mehdi Sadeghi, Mustafa Sarısaman   +1 more
wiley   +1 more source

Ground state solution of a nonlocal boundary-value problem

Electronic Journal of Differential Equations, 2013
In this article, we apply the Nehari manifold method to study the Kirchhoff type equation $$ -\Big(a+b\int_\Omega|\nabla u|^2dx\Big)\Delta u=f(x,u) $$ subject to Dirichlet boundary conditions.
Cyril Joel Batkam
doaj