Results 51 to 60 of about 603 (182)

Next Generation 7 Tesla Arterial Spin Labeling With Rotated Spiral Acquisition Enables Mesoscale Resolution in 3D Brain Perfusion and Functional MRI

Magnetic Resonance in Medicine, Volume 95, Issue 5, Page 2702-2717, May 2026.
ABSTRACT Purpose To achieve high resolution (≤ 1 mm isotropic) whole‐brain perfusion imaging at 7 T with next generation ASL pulse sequence, reconstruction algorithm, and MRI hardware. Methods We capitalized on three major innovations: (1) FLASH‐based pseudo‐Continuous ASL (pCASL) sequence with rotated golden‐angle stack‐of‐spirals (rGA‐SoS) sampling; (
Chenyang Zhao, Fanhua Guo, Zidong Yang, Xingfeng Shao, Samantha J. Ma, Alexander J. S. Beckett, An T. Vu, David A. Feinberg, Danny J. J. Wang   +8 more
wiley   +1 more source

Shifted model spaces and their orthogonal decompositions [PDF]

Opuscula Mathematica
We generalize certain well known orthogonal decompositions of model spaces and obtain similar decompositions for the wider class of shifted model spaces, allowing us to establish conditions for near invariance of the latter with respect to certain ...
M. Cristina Câmara, Kamila Kliś-Garlicka, Marek Ptak   +2 more
doaj   +1 more source

Toeplitz Operators in the Herglotz Space [PDF]

Integral Equations and Operator Theory, 2016
We define and study Toeplitz operators in the space of Herglotz solutions of the Helmholtz equation in $R^d$. As the most traditional definition of Toeplitz operators via Bergman-type projection is not available here, we use an approach based upon the reproducing kernel nature of the Herglotz space and sesquilinear forms, which results in a meaningful ...
Rozenblum, Grigori, Vasilevski, Nikolai
openaire   +3 more sources

Viscoacoustic Full Wavefield Migration With Tomographic Q Estimation

Geophysical Prospecting, Volume 74, Issue 4, May 2026.
ABSTRACT Seismic wave propagation in the Earth's subsurface is influenced by anelastic attenuation, which causes energy loss and waveform distortion, degrading image resolution. This effect, quantified by the quality factor (Qf${{\textit {Q}}_f}$), is particularly pronounced in settings such as carbon capture and storage and near‐surface studies, where
Mohammad Safari, Dirk Jacob Verschuur
wiley   +1 more source

Toeplitz Type Operators Associated with Generalized Calderón-Zygmund Operator on Weighted Morrey Spaces

Journal of Function Spaces, 2016
Let T1 be a generalized Calderón-Zygmund operator or ±I (the identity operator), let T2 and T4 be the linear operators, and let T3=±I. Denote the Toeplitz type operator by Tb=T1MbIαT2+T3IαMbT4, where Mbf=bf and Iα is the fractional integral operator.
Bijun Ren, Enbin Zhang
doaj   +1 more source

Hyponormality of Toeplitz operators with non-harmonic symbols on the Bergman spaces

Journal of Inequalities and Applications, 2021
In this paper, we present some necessary and sufficient conditions for the hyponormality of Toeplitz operator T φ $T_{\varphi }$ on the Bergman space A 2 ( D ) $A^{2}(\mathbb{D})$ with non-harmonic symbols under certain assumptions.
Sumin Kim, Jongrak Lee
doaj   +1 more source

On Calder�n-Toeplitz operators

Monatshefte f�r Mathematik, 1993
Let \(\psi\in L^ 2(\mathbb{R}^ d)\) be an admissible wavelet, \(\psi_ \xi(x)= t^{-d/2} \psi\Bigl({x-v\over t}\Bigr)\), \(\xi= (v,t)\), \(G\) the ``\(ax+ b\)''-group, i.e. \(G=\{\xi= (v,t): v\in \mathbb{R}^ d, t>0\}\), \(d\xi= t^{d-1}dv dt\) the left invariant measure on \(G\).
openaire   +1 more source

The effect of labor epidural analgesia on uterine activity using electrohysterography monitoring: A follow‐up study

Acta Obstetricia et Gynecologica Scandinavica, Volume 105, Issue 5, Page 912-921, May 2026.
Epidural analgesia during the first stage of labor shows no clinically relevant changes in uterine contraction frequency and duration, but it is associated with a significant reduction in uterine intensity. Their clinical implications need further research.
Phebe B. Q. Berben, Yannick L. Smolders, Ivar R. de Vries, Nadine D. de Klerk, Annemarie F. Fransen, Marta Regis, M. Beatrijs van der Hout – van der Jagt, Myrthe van der Ven, Alexandra M. J. V. Schyns‐van den Berg, S. Guid Oei, Judith O. E. H. van Laar   +10 more
wiley   +1 more source

Toeplitz Operators on the Weighted Bergman Space over the Two-Dimensional Unit Ball

Journal of Function Spaces, 2015
We extend the known results on commutative Banach algebras generated by Toeplitz operators with radial quasi-homogeneous symbols on the two-dimensional unit ball.
Alma García, Nikolai Vasilevski
doaj   +1 more source

Gysin sequences and SU(2)‐symmetries of C∗‐algebras

Transactions of the London Mathematical Society, 2021
Motivated by the study of symmetries of C∗‐algebras, as well as by multivariate operator theory, we introduce the notion of an SU(2)‐equivariant subproduct system of Hilbert spaces. We analyse the resulting Toeplitz and Cuntz–Pimsner algebras and provide
Francesca Arici, Jens Kaad
doaj   +1 more source