Results 121 to 130 of about 601,821 (236)
Computing the matrix exponential with the double exponential formula
Special MatricesThis article considers the computation of the matrix exponential eA{{\rm{e}}}^{A} with numerical quadrature. Although several quadrature-based algorithms have been proposed, they focus on (near) Hermitian matrices.
Tatsuoka Fuminori +3 more
doaj +1 more source
A Lower Bound on the Altitude of the Hiroshima Firestorm Plume From Ray Optics
Geophysical Research Letters, Volume 53, Issue 21, 16 November 2026.Abstract Projections of nuclear winter are critically sensitive to the height of soot lofted by firestorms, yet direct observations of firestorm plumes are scarce. Here, a lower bound is established for the height of the Hiroshima firestorm plume 97 min after detonation.
David M. Romps, Rusen Öktem, Zhenyu He
wiley +1 more source
Tensor‐Train Compression of a Volume Integral Eddy Current Problem in Discontinuous Galerkin
International Journal for Numerical Methods in Engineering, Volume 127, Issue 21, 15 November 2026.ABSTRACT The paper presents a low‐rank tensor compression strategy based on the tensor‐train (TT) format for the integral operator arising in eddy current problems. Unlike classical matrix compression techniques such as the fast multipole method (FMM) or hierarchical matrices (ℋ$$ \mathscr{H} $$‐matrices), which typically compress only far‐field ...
Anthony Torosyan +5 more
wiley +1 more source
Magnetic Resonance in Medicine, Volume 96, Issue 5, Page 2489-2504, November 2026.ABSTRACT Purpose To improve the accuracy of diffusion‐weighted powder average signals for diffusion encoding with arbitrary b‐tensors. Methods We identify an intrinsic dihedral (D2) symmetry of diffusion signals for arbitrary diffusion encoding, which defines their natural signal space (a quotient of 3D rotations). Based on this, we propose a method to
Sune Nørhøj Jespersen +1 more
wiley +1 more source
Fermat's treatise on quadrature: A new reading [PDF]
The Treatise on Quadrature of Fermat (c. 1659), besides containing the first known proof of the computation of the area under a higher parabola, R x+m/n dx, or under a higher hyperbola, R x-m/n dx— with the appropriate limits of integration in each case—,
Josep Pla +2 more
core
Известия высших учебных заведений. Поволжский регион: Физико-математические наукиBackground. Linear differential equations with constant coefficients are often used to solve a number of physical, engineering, chemical and biological problems.
Dostonjon N. Barotov, Ruziboy N. Barotov
doaj +1 more source
Radial Tiny Golden Angle UTE (tyGA‐UTE) for Cardiac MRI in the Small Animal Model
NMR in Biomedicine, Volume 39, Issue 11, November 2026.This study validates an 11.7‐T ultra‐high‐field tyGA‐UTE cardiac MRI workflow for murine models, featuring single‐acquisition dual reconstructions for real‐time visualization and quantitative functional assessment. It delivers performance equivalent to standard techniques, excellent reproducibility, and higher efficiency by eliminating repeated scans ...
Hao Li +4 more
wiley +1 more source
Van Allen Probes Observations of a Fundamental Poloidal Wave in the Plasmasphere
Journal of Geophysical Research: Space Physics, Volume 131, Issue 11, November 2026.Abstract All past spacecraft observations of fundamental poloidal Alfvén (P1) waves attributed to ion drift resonance have been made outside the plasmasphere. In this study, we present the first spacecraft observations of a plasmaspheric P1 wave driven by that resonance.
Kazue Takahashi +4 more
wiley +1 more source
Local quadrature formulas on the sphere
Journal of Complexity, 2004 Among other things, the author proves the existence of quadrature formulae of a fixed degree on a spherical cap.
openaire +3 more sources