Results 51 to 60 of about 16,479 (201)

GloMarGridding: A Python Toolkit for Flexible Spatial Interpolation in Climate Applications

Geoscience Data Journal, Volume 13, Issue 2, April 2026.
Global surface climate datasets contain structural uncertainty that is difficult to attribute to individual processing steps. We present GloMarGridding, a Python package that isolates the spatial interpolation component using Gaussian Process Regression (or kriging) to generate spatially complete fields and uncertainty estimates. The techniques used in
Richard C. Cornes, Steven C. Chan, Archie Cable, Duo Chan, Agnieszka Faulkner, Elizabeth C. Kent, Joseph T. Siddons   +6 more
wiley   +1 more source

Revisiting Amplitude of Low‐Frequency Fluctuations (ALFF) in Resting‐State fMRI: Clarifications and Improvements

Human Brain Mapping, Volume 47, Issue 5, 1 April 2026.
We provide a mathematical clarification of ALFF and fALFF by introducing two variants: the arithmetic mean‐defined and the quadratic mean‐defined to clarify the inconsistencies in the definition and implementation of (f)ALFF. ABSTRACT The amplitude of low‐frequency fluctuations (ALFF) and its related measure, fractional ALFF (fALFF), are widely used ...
Lejian Huang, Rami Jabakhanji, Andrew D. Vigotsky, Paulo Branco, Marwan N. Baliki, A. Vania Apkarian   +5 more
wiley   +1 more source

Multi-Grid Lanczos

EPJ Web of Conferences, 2018
We present a Lanczos algorithm utilizing multiple grids that reduces the memory requirements both on disk and in working memory by one order of magnitude for RBC/UKQCD’s 48I and 64I ensembles at the physical pion mass.
Clark M. A., Jung Chulwoo, Lehner Christoph   +2 more
doaj   +1 more source

Quantitative 3D Real‐Space Analysis of Photonic Supraparticles

Advanced Materials, Volume 38, Issue 17, 20 March 2026.
This work shows that through quantitative 3D real‐space analysis, photonic supraparticles can be investigated in detail. By clustering and classifying all particles, structure features can easily be detected, and the internal structure can be quickly investigated. This methodology allows for quick identification of different crystal structures, such as
Jesse Ian Bückmann, Leroy Daniël Hoitink, Ruizhi Yang, Alptuğ Ulugöl, Laura Filion, Alfons van Blaaderen   +5 more
wiley   +1 more source

A convergence analysis for nonsymmetric Lanczos algorithms [PDF]

Mathematics of Computation, 1991
A convergence analysis for the nonsymmetric Lanczos algorithm is presented. By using a tridiagonal structure of the algorithm, some identities concerning Ritz values and Ritz vectors are established and used to derive approximation bounds. In particular, the analysis implies the classical results for the symmetric Lanczos algorithm.
openaire   +1 more source

Short-recurrence Krylov subspace methods for the overlap Dirac operator at nonzero chemical potential

, 2010
The overlap operator in lattice QCD requires the computation of the sign function of a matrix, which is non-Hermitian in the presence of a quark chemical potential. In previous work we introduced an Arnoldi-based Krylov subspace approximation, which uses
Andreas Frommer, Bloch, Bloch, Bloch, Bloch, Bloch, Bloch, Eiermann, Freund, Freund, Frommer, Frommer, Frommer, Ginsparg, Golub, Higham, Ingerman, Jacques C.R. Bloch, Jegerlehner, Katrin Schäfer, Kenney, Lüscher, Narayanan, Neuberger, Neuberger, Neuberger, Paige, Parlett, Saad, Simon Heybrock, Simoncini, Tilo Wettig, Tobias Breu, van den Eshof, van der Vorst, van der Vorst, Zolotarev   +36 more
core   +1 more source

Operator growth in 2d CFT

Journal of High Energy Physics, 2021
We investigate and characterize the dynamics of operator growth in irrational two-dimensional conformal field theories. By employing the oscillator realization of the Virasoro algebra and CFT states, we systematically implement the Lanczos algorithm and ...
Pawel Caputa, Shouvik Datta
doaj   +1 more source

Poroelastic Bulk Controls on Shear Localization in Fault Gouge During Earthquake Rupture: Insights From a Hybrid Numerical Framework

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 3, March 2026.
Abstract Seismic ruptures that extend over kilometers along faults originate in shear zones only millimeters thick. We present a hybrid numerical framework coupling the spectral boundary integral method (SBIM) for the poroelastic bulk with a staggered‐grid finite difference method (FDM) for the fault gouge.
Yu‐Han Wang, Elías Rafn Heimisson
wiley   +1 more source

Comparison of Doubling the Size of Image Algorithms

Моделирование и анализ информационных систем, 2016
In this paper the comparative analysis for quality of some interpolation non-adaptive methods of doubling the image size is carried out. We used the value of a mean square error for estimation accuracy (quality) approximation.
S. E. Vaganov, S. I. Khashin
doaj   +1 more source

Differentiating Average and Extreme Extra‐Tropical Cyclones by Their Vertical Tilt and Potential Vorticity Structure

Geophysical Research Letters, Volume 53, Issue 3, 16 February 2026.
Abstract This study compares the vertical tilt and potential vorticity (PV) $(PV)$ structure of average and extreme extra‐tropical cyclones (ETCs) in the Northern Hemisphere during the cold season (October–March) in ERA5 reanalysis. Vertical tilt is quantified using a novel two‐component (directional and lateral, aligned with and across cyclone motion)
Daniel Köhler, Victoria A. Sinclair
wiley   +1 more source