Results 61 to 70 of about 22,526 (213)
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 +5 more
wiley +1 more source
Geophysical Research Letters, Volume 53, Issue 6, 28 March 2026.Abstract This study investigates mechanisms by which distinct intraseasonal oscillation modes drive regional persistent extreme precipitation events over South China during the rainy season. Based on periodic characteristics of 54 such events, two dominant modes are identified: 12–20‐day (type‐1) and 25–50‐day (type‐2) oscillations. Although comparable
Wei Lu +7 more
wiley +1 more source
A staggered eigensolver based on sparse matrix bidiagonalization
EPJ Web of Conferences, 2018 We present a method for calculating eigenvectors of the staggered Dirac operator based on the Golub-Kahan-Lanczos bidiagonalization algorithm. Instead of using orthogonalization during the bidiagonalization procedure to increase stability, we choose to ...
Osborn James C., Jin Xiao-Yong
doaj +1 more source
Optimal solution error covariance in highly nonlinear problems of variational data assimilation [PDF]
Nonlinear Processes in Geophysics, 2012 The problem of variational data assimilation (DA) for a nonlinear evolution model is formulated as an optimal control problem to find the initial condition, boundary conditions and/or model parameters.
V. Shutyaev +3 more
doaj +1 more source
Kondo Lattice Model with Finite Temperature Lanczos Method
, 2006 We investigate the Kondo Lattice Model on 2D clusters using the Finite Temperature Lanczos Method. The temperature dependence of thermodynamic and correlations functions are systematically studied for various Kondo couplings JK. The ground state value of
B. Schmidt +3 more
core +1 more source
Computational Methods for UV-Suppressed Fermions [PDF]
, 2002 Lattice fermions with suppressed high momentum modes solve the ultraviolet slowing down problem in lattice QCD. This paper describes a stochastic evaluation of the effective action of such fermions.
Artan Boriçi +18 more
core +2 more sources
Different Responses of the Madden‐Julian Oscillation to the Fast and Slow Decaying El Niño in Spring
Geophysical Research Letters, Volume 53, Issue 6, 28 March 2026.Abstract This study investigates the modulation of the Madden‐Julian Oscillation (MJO) by El Niño during decaying springs, using reanalysis data. El Niño events are categorized into fast‐decaying (FD) and slow‐decaying (SD) types based on their decaying rate.
Xiong Chen, Chongyin Li, Minghao Yang
wiley +1 more source
Attribution of Interdecadal Changes in the Spatial Structure of the Spring AO
Journal of Geophysical Research: Atmospheres, Volume 131, Issue 5, 16 March 2026.Abstract The Arctic Oscillation (AO) is one of the key atmospheric circulation modes in the mid‐to‐high latitudes of the Northern Hemisphere. The spatial structure of the spring AO exhibits pronounced interdecadal variation, primarily characterized by a shift of the midlatitude circulation center from the North Pacific Center (NPC) to the North ...
Yanzhu Zheng +3 more
wiley +1 more source
On the Lanczos Method for Computing Some Matrix Functions
AxiomsThe study of matrix functions is highly significant and has important applications in control theory, quantum mechanics, signal processing, and machine learning.
Ying Gu +2 more
doaj +1 more source
Filter diagonalization of shell-model calculations
, 2010 We present a method of filter diagonalization for shell-model calculations. This method is based on the Sakurai and Sugiura (SS) method, but extended with help of the shifted complex orthogonal conjugate gradient (COCG) method.
Honma, Michio +3 more
core +1 more source