Results 51 to 60 of about 205 (147)

Multivariate Polynomials, Duality, and Structured Matrices [PDF]

, 1998
We first review the basic properties of the well known classes of Toeplitz, Hankel, Vandermonde, and other related structured matrices and re-examine their correlations to operations with univariate polynomials.
Victor Y. Pan, Mourrain, Bernard, Pan, Victor Y., Pan, Victor Y., Y., Bernard Mourrain, Pan, Victor, Y.   +5 more
core   +3 more sources

Coil Sketching for Fast and Efficient 4D Lung MRI Reconstruction

Magnetic Resonance in Medicine, Volume 95, Issue 4, Page 2241-2253, April 2026.
ABSTRACT Purpose To develop and evaluate a memory‐efficient and accelerated reconstruction framework for respiratory‐resolved 4D lung MRI using coil sketching and Toeplitz approximation, enabling high‐quality motion‐compensated low‐rank (MoCo‐LR) reconstructions on clinically accessible GPU hardware.
Joseph W. Plummer, Pierre Daudé, Anastasia Tsakirellis, Jordan Taylor, Joel Moss, Rajiv Ramasawmy, Ahsan Javed, Adrienne E. Campbell‐Washburn   +7 more
wiley   +1 more source

Topologizability and Power Boundedness of Convolutions and Toeplitz Operators on Power Series Spaces [PDF]

We characterize the topologizability and power boundedness of convolution and dual convolution operators on power series spaces.We determine necessary conditions for a Toeplitz operator to be m-topologizable, and power bounded on 1(n) and ∞(n), and ...
Doğan, Nazlı
core   +1 more source

Pulmonary Transit Time Can Be Accurately Quantified From Non‐Arterial Input Function Series in First‐Pass Cardiac Perfusion MRI

Magnetic Resonance in Medicine, Volume 95, Issue 4, Page 2207-2213, April 2026.
ABSTRACT Purpose Previous studies suggested that arterial‐input‐function (AIF) images are necessary to avoid signal saturation for pulmonary transit time (PTT) measurements. This study challenges that notion by investigating whether PTT can be accurately measured using blood pool signals from myocardial enhancement (non‐AIF) images during resting first‐
Mingyue Zhao, Lexiaozi Fan, Kyungpyo Hong, Benjamin H. Freed, Jacqueline Urban, Kelvin Chow, Li‐Yueh Hsu, Daniel C. Lee, Daniel Kim   +8 more
wiley   +1 more source

Breaking Barriers in High‐Order Spectral Methods: The Intrinsic Matrix Approach

International Journal for Numerical Methods in Engineering, Volume 127, Issue 5, 15 March 2026.
ABSTRACT This paper introduces a unified framework in Hilbert spaces for applying high‐order differential operators in bounded domains using Chebyshev, Legendre, and Fourier spectral methods. By exploiting the banded structure of differentiation matrices and embedding boundary conditions directly into the operator through a scaling law relating ...
Osvaldo Guimarães, José R. C. Piqueira
wiley   +1 more source

Berezin-type operators on the cotangent bundle of a nilpotent group [PDF]

, 2019
We define and study coherent states, a Berezin-Toeplitz quantization and covariant symbols on the product Xi := G x g(#) between a connected simply connected nilpotent Lie group and the dual of its Lie algebra.
M. Măntoiu, Mantoiu, Marius
core   +1 more source

Online Spatiotemporally Constrained Reconstruction for Real‐Time Interactive MRI

Magnetic Resonance in Medicine, Volume 95, Issue 3, Page 1644-1652, March 2026.
ABSTRACT Purpose To develop a low‐latency dynamic MRI reconstruction that provides better spatial and temporal fidelity than contemporary online reconstruction, for localization. Methods We utilize online spatiotemporally constrained reconstruction (STCR) using a computationally efficient augmented Lagrangian solution and a limited number of iterations
Duc H. Le, Prakash Kumar, Ecrin Yagiz, Ye Tian, Krishna S. Nayak   +4 more
wiley   +1 more source

Toeplitz Operators on Locally Compact Abelian Groups [PDF]

, 1965
Let G be a non-discrete locally compact Abelian group, let Γ be its non-compact dual group, and let m and μ be Haar measures on G and Γ respectively, normalized so the Fourier inversion theorem holds.
Krieger, Henry A
core  

Stability and Instability of Time‐Domain Boundary Element Methods for the Acoustic Neumann Problem

Proceedings in Applied Mathematics and Mechanics, Volume 26, Issue 1, March 2026.
ABSTRACT This work presents a stable time‐domain boundary element method for the acoustic wave equation in three‐dimensional unbounded domains. Other formulations of time‐domain boundary element methods based on retarded potential operators are known to exhibit stability issues, which often hinder their use in industrial contexts.
Simon Schneider, Ceyhun Özdemir, Heiko Gimperlein, Karsten Urban, Bernd Graf   +4 more
wiley   +1 more source

Inner functions and spherical isometries [PDF]

, 2011
A commuting tuple T = ( T 1 , … , T n ) ∈ B ( H ) n T =(T_1, \ldots , T_n) \in ...
Michael Didas, Jörg Eschmeier
core   +1 more source