Results 61 to 70 of about 12,127 (168)

Deciphering the performance of different surface models for corneal topography

Ophthalmic and Physiological Optics, Volume 45, Issue 6, Page 1270-1281, September 2025.
Abstract Purpose To study the performance of different corneal surface models to be used for ray tracing. Models based on geometric surfaces and polynomial fits were compared and the differences discussed. Methods For this simulation study, five characteristic generic surface configurations were generated: (A) perfect biconic, (B) decentred biconic ...
Achim Langenbucher, Nóra Szentmáry, Alan Cayless, Peter Hoffmann, Jascha Wendelstein   +4 more
wiley   +1 more source

Surface and Subsurface Biogeochemical Impacts of the 2019 Northeast Pacific Marine Heatwave

Geophysical Research Letters, Volume 52, Issue 16, 28 August 2025.
Abstract Following the highly impactful 2013–2016 Marine Heatwave (MHW), another MHW occurred in the Northeast Pacific during summer 2019. While the physical drivers of this event are well described, its biogeochemical impacts remain poorly understood. We use Ocetrac, a Python package that tracks spatiotemporal extreme events, to identify physical and ...
C. Kohlman, S. Mogen, J. T. Cohen, J. Araujo, E. Beaudin, G. Bonino, A. Gagliardi, N. S. Lovenduski   +7 more
wiley   +1 more source

Soil Moisture Feedback Amplified the Earlier Onset of the Record‐Breaking Three‐Day Consecutive Heatwave in 2023 in North China

Earth's Future, Volume 13, Issue 7, July 2025.
Abstract A record‐breaking heatwave swept North China in the summer of 2023, with a regional average of daily maximum temperature exceeding 35°C on June 23, which was the hottest day since 1959. We use the dynamical adjustment approach to assess the contributions of atmospheric circulation and Soil moisture (SM) to this heatwave and find that they ...
Kexin Gui, Tianjun Zhou
wiley   +1 more source

Efficient tomography with unknown detectors

, 2017
We compare the two main techniques used for estimating the state of a physical system from unknown measurements: standard detector tomography and data-pattern tomography.
Hradil, Z., Motka, L., Paur, M., Rehacek, J., Sanchez-Soto, L. L.   +4 more
core   +1 more source

Basis function compression for field probe monitoring

Magnetic Resonance in Medicine, Volume 93, Issue 6, Page 2414-2433, June 2025.
Abstract Purpose Field monitoring using field probes allows for accurate measurement of magnetic field perturbations, such as from eddy currents, during MRI scanning. However, errors may result when the spatial variation of the fields is not well‐described by the conventionally used spherical harmonics model that has the maximum order constrained by ...
Paul I. Dubovan, Gabriel Varela‐Mattatall, Eric S. Michael, Franciszek Hennel, Ravi S. Menon, Klaas P. Pruessmann, Adam B. Kerr, Corey A. Baron   +7 more
wiley   +1 more source

Time‐Multiplexed Reservoir Computing with Quantum‐Dot Lasers: Impact of Charge‐Carrier Scattering Timescale

physica status solidi (RRL) – Rapid Research Letters, Volume 19, Issue 6, June 2025.
Reservoir computing with optical devices offers an energy‐efficient approach for time‐series forecasting. For quantum‐dot lasers with optical self‐feedback, the scattering timescale R into the quantum‐dot levels changes the predictive performance of the reservoir computer.
Huifang Dong, Lina Jaurigue, Kathy Lüdge   +2 more
wiley   +1 more source

OCReP: An Optimally Conditioned Regularization for Pseudoinversion Based Neural Training

, 2015
In this paper we consider the training of single hidden layer neural networks by pseudoinversion, which, in spite of its popularity, is sometimes affected by numerical instability issues.
Cancelliere, Rossella, Gai, Mario, Gallinari, Patrick, Rubini, Luca   +3 more
core   +1 more source

New Iterative Procedures for Approximating Different Types of Inverse Matrix: Convergence and Stability

Mathematical Methods in the Applied Sciences, Volume 48, Issue 8, Page 8806-8817, 30 May 2025.
ABSTRACT In this paper, we propose a new parametric family of iterative schemes to compute the inverse of a complex nonsingular matrix. It is shown that the members of this family have at least a fourth order of convergence. A particular element of the class is extended to approximate the Moore–Penrose inverse of rectangular complex matrices, keeping ...
Alicia Cordero, Elaine Segura, Juan R. Torregrosa, María P. Vassileva   +3 more
wiley   +1 more source

Monotonicity and limit results for certain symmetric matrix-valued functions with applications in singular Sturmian theory

Applied Mathematics in Science and Engineering
In this paper we study the monotonicity and limit properties at infinity of certain symmetric matrix-valued functions arising in the singular Sturmian theory of canonical linear differential systems.
Peter Šepitka, Roman Šimon Hilscher
doaj   +1 more source

Randomly pivoted Cholesky: Practical approximation of a kernel matrix with few entry evaluations

Communications on Pure and Applied Mathematics, Volume 78, Issue 5, Page 995-1041, May 2025.
Abstract The randomly pivoted Cholesky algorithm (RPCholesky) computes a factorized rank‐k$k$ approximation of an N×N$N \times N$ positive‐semidefinite (psd) matrix. RPCholesky requires only (k+1)N$(k + 1)N$ entry evaluations and O(k2N)$\mathcal {O}(k^2 N)$ additional arithmetic operations, and it can be implemented with just a few lines of code.
Yifan Chen, Ethan N. Epperly, Joel A. Tropp, Robert J. Webber   +3 more
wiley   +1 more source