Results 41 to 50 of about 80,061 (162)

Eigenproblem for Jacobi matrices: hypergeometric series solution

, 2006
We study the perturbative power-series expansions of the eigenvalues and eigenvectors of a general tridiagonal (Jacobi) matrix of dimension d. The(small) expansion parameters are being the entries of the two diagonals of length d-1 sandwiching the ...
Evgeny, K. Sklyanin, Vadim B. Kuznetsov
core   +2 more sources

Nonzero radial solutions for a class of elliptic systems with nonlocal BCs on annular domains [PDF]

, 2014
We provide new results on the existence, non-existence, localization and multiplicity of nontrivial solutions for systems of Hammerstein integral equations.
Infante, Gennaro, Pietramala, Paolamaria
core   +1 more source

Discrete Chiral Ballistic Polariton Laser

Laser &Photonics Reviews, Volume 19, Issue 15, August 7, 2025.
Planar microcavities in the strong light–matter coupling regime exhibit exciton‐polariton modes with a strong chiral response toward circularly polarized light. This feature is exploited alongside inherent spin‐orbit coupling of cavity light to generate giant discrete optical vortices in polygonal arrays of exciton‐polariton condensates.
Zuzanna Werner, Andrzej Frączak, Valtýr Kári Daníelsson, Jacek Szczytko, Barbara Piętka, Helgi Sigurðsson   +5 more
wiley   +1 more source

Deep Learning‐Coupled Metabolic Heat Integrated Sensing System for Noninvasive Continuous Monitoring of Blood Glucose

Advanced Intelligent Systems, Volume 7, Issue 5, May 2025.
A portable, wearable device based on metabolic heat integrated sensing and deep learning enables continuous blood glucose (BG) monitoring. The system uses a gate recurrent unit model for real‐time BG prediction, achieving accuracy comparable to commercial noninvasive meters.
Haolin Wang, Chuanjie Yao, Zhibo Liu, Xinze Wang, Zhengjie Liu, Tao Zhang, Xinshuo Huang, LinGe Wang, Yuedan Wang, Gemin Xiao, Shady Farah, Hui‐jiuan Chen, Xi Xie   +12 more
wiley   +1 more source

Seasonal Evaluation of Ephemeroptera (Insecta) Fauna of Eastern Mediterranean Basin and Determination of Water Quality With Physicochemical Parameters and Benthic Metrics

Ecohydrology, Volume 18, Issue 3, April‐May 2025.
ABSTRACT This study evaluates the Ephemeroptera fauna and water quality in the Eastern Mediterranean Basin using physicochemical variables and benthic metrics, offering an ecological water quality analysis. Fieldwork conducted during the spring, summer and autumn of 2019 across 20 localities revealed 965 individuals belonging to 17 species from seven ...
Selda Öztürk, Erdoğan Çiçek, Mehmet Güvenç Negiz   +2 more
wiley   +1 more source

Breakdown of staggered fermions at nonzero chemical potential

, 2006
The staggered fermion determinant is complex when the quark chemical potential mu is nonzero. Its fourth root, used in simulations with dynamical fermions, will have phase ambiguities that become acute when Re mu is sufficiently large.
Benjamin Svetitsky, C. Bernard, Maarten Golterman, O. Philipsen, S. Kratochvila, Y. Shamir, Yigal Shamir   +6 more
core   +1 more source

Volt/VAr Regulation of the West Mediterranean Regional Electrical Grids Using SVC/STATCOM Devices With Neural Network Algorithms

Wind Energy, Volume 28, Issue 2, February 2025.
ABSTRACT Reactive power compensation is now a challenging issue in maintaining adequate power quality and improving the performance of the transmission system. Many researchers have focused on the behavior of voltage in the unbalanced state, and the majority of the studies have been done with STATCOM. In this study, the increasing power demand in power
H. Feza Carlak, Ergin Kayar
wiley   +1 more source

Spatial distribution of health risk assessment of a drinking water reservoir exposed to urban agglomeration and industrial lead contamination in Istanbul, Türkiye

Water Environment Research, Volume 97, Issue 2, February 2025.
The contents of 12 PTEs in the surface water of the dam lake were compared. Ecological risk indices and GIS‐based maps were used to assess stochastic health risks of PTEs. Factor/cluster and correlation analyses were conducted for source identification of PTEs.
Hüseyin Cüce, Erkan Kalipci, Fikret Ustaoğlu, Mehmet Ali Dereli, Seda Alkaya, Aysun Türkmen   +5 more
wiley   +1 more source

Simple eigenvalues and bifurcation for a multiparameter problem [PDF]

Proceedings of the Edinburgh Mathematical Society, 1988
We are concerned with the problem of bifurcation of solutions of a non-linear multiparameter problem at a simple eigenvalue of the linearised problem.Let X and Y be real Banach spaces, and let A, Bi, i = 1, …, n∈B(X, Y). Let : Rn × X → Y be a non-linear mapping. We consider the equationwhereand λ=(λ1, λ2,…,λn) ∈ Rn is an n-tuple of spectral parameters.
McGhee, D. F., Sallam, M. H.
openaire   +2 more sources

A Multiparameter Singular Perturbation Analysis of the Robertson Model

Studies in Applied Mathematics, Volume 154, Issue 2, February 2025.
ABSTRACT The Robertson model describing a chemical reaction involving three reactants is one of the classical examples of stiffness in ODEs. The stiffness is caused by the occurrence of three reaction rates k1,k2,${k}_{1},{k}_{2},$ and k3,${k}_{3},$ with largely differing orders of magnitude, acting as parameters.
Lukas Baumgartner, Peter Szmolyan
wiley   +1 more source