Results 151 to 160 of about 61,972 (313)

On the Stability Barrier of Hermite Type Discretizations of Advection Equations

open access: yesNumerical Methods for Partial Differential Equations, Volume 42, Issue 1, January 2026.
ABSTRACT We establish a stability barrier for a class of high‐order Hermite‐type discretization of 1D advection equations underlying the hybrid‐variable (HV) and active flux (AF) methods. These methods approximate both cell averages and nodal solutions and evolve them in time simultaneously.
Xianyi Zeng
wiley   +1 more source

The Dual Frequency Spectral Density Function of Locally Periodic Stationary Processes With an Application to Testing for Correlation Between Different Frequency Bands of a Time Series

open access: yesJournal of Time Series Analysis, Volume 47, Issue 1, Page 158-173, January 2026.
ABSTRACT Harmonizable processes are a class of nonstationary time series, that are characterized by their dependence between different frequencies of a time series. The covariance between two frequencies is the dual frequency spectral density, an object analogous to the spectral density function.
Pramita Bagchi   +3 more
wiley   +1 more source

On certain extremal Banach–Mazur distances and Ader's characterization of distance ellipsoids

open access: yesMathematika, Volume 72, Issue 1, January 2026.
Abstract A classical consequence of the John Ellipsoid Theorem is the upper bound n$\sqrt {n}$ on the Banach–Mazur distance between the Euclidean ball and any symmetric convex body in Rn$\mathbb {R}^n$. Equality is attained for the parallelotope and the cross‐polytope. While it is known that they are unique with this property for n=2$n=2$ but not for n⩾
Florian Grundbacher, Tomasz Kobos
wiley   +1 more source

Data Driven Control of Defect Formation in Solution Deposited Sb2Se3 Thin Films

open access: yesAdvanced Materials Interfaces, Volume 12, Issue 24, December 22, 2025.
A data‐driven design of experiments (DoE) approach is used to uncover how six interdependent processing parameters govern defect formation in solution‐deposited Sb2Se3 thin films. Statistical modeling revealed strong non‐linear couplings that control film quality, and the optimized films showed a threefold enhancement in photoresponse, demonstrating ...
Marissa J. Strumolo   +4 more
wiley   +1 more source

The Hickory Run Boulder Field, Carbon County, Pennsylvania, USA: Morphology, sedimentology and development

open access: yesEarth Surface Processes and Landforms, Volume 50, Issue 15, December 2025.
Relative weathering indices and three‐dimensional fabric analyses demonstrate allochthonous emplacement of the Hickory Run Boulder Field via periglacial mass movement. Spatially coherent trends confirm a time‐transgressive surface formed under Pleistocene permafrost conditions, with tributary‐like integration of clasts from a secondary boulder field ...
Raven J. Mitchell, Frederick E. Nelson
wiley   +1 more source

On the Behavior of Two C1 Finite Elements Versus Anisotropic Diffusion

open access: yesInternational Journal for Numerical Methods in Fluids, Volume 97, Issue 12, Page 1541-1557, December 2025.
Bi‐cubic Hemite‐Bézier and reduced cubic Hsieh‐Clough‐Tocher finite elements, of class C1, are compared for the solution of a highly anisotropic diffusion equation. They are tested numerically for various ratios of the diffusion coefficients on different meshes, even aligned with the anisotropy.
Blaise Faugeras   +3 more
wiley   +1 more source

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