Results 81 to 90 of about 6,054,073 (251)

Rotating Frame Spin‐Lock Cardiac MRI Method at 9.4 T Can Characterize Diffuse Fibrosis in Progressing Hypertensive Heart Disease in Mice

Magnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose This study aimed to investigate the applicability of rotating frame spin‐lock continuous wave (CW) T1ρ and relaxation along a fictitious field with Rank 2 (RAFF2) methods complementary to native T1 and late gadolinium enhancement (LGE) for cardiac magnetic resonance imaging (CMRI) of diffuse fibrosis in mice with advancing hypertensive
Riku Kiviluoto, Diana Törmä, Ahmed Tawfek, Aleksi J. Leikas, Eetu Räihä, Mari Merentie, Anna‐Kaisa Ruotsalainen, Seppo Ylä‐Herttuala, Elias Ylä‐Herttuala   +8 more
wiley   +1 more source

A differential quadrature method solution for shear-deformable shells of revolution

, 2005
This paper deals with the application of the differential quadrature method to the linear elastic static analysis of isotropic rotational shells. The governing equations of equilibrium, in terms of stress resultants and couples, are those from Reissner ...
Gould P L, Viola E, Artioli E, Edoardo Artioli, Erasmo Viola, Phillip L. Gould   +5 more
core   +2 more sources

Spline-Based Computational Technique for Singularly Perturbed Fredholm Integro-Differential Problems

International Journal of Differential Equations
In this work, using a spline-based discretization, we develop a computational approach for singularly perturbed Fredholm integro-differential equations.
Rajagopal S., Dinesh Kumar S.
doaj   +1 more source

A Robust and Versatile Numerical Framework for Modeling Complex Fractional Phenomena: Applications to Riccati and Lorenz Systems

Fractal and Fractional
The fractional differential quadrature method (FDQM) with generalized Caputo derivatives is used in this paper to show a new numerical way to solve fractional Riccati equations and fractional Lorenz systems.
Waleed Mohammed Abdelfattah, Ola Ragb, Mohamed Salah, Mokhtar Mohamed   +3 more
doaj   +1 more source

Combined Metasurface and Metamaterial Passive Transmit Lens and Receive Array for 3 T

Magnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose Metasurfaces (MSs) and metamaterials (MMs) can reduce transmit field nulls caused by wavelength effects at higher MR field strengths. We present a layered MM and MS resonant structure that improves transmit field performance when used as a combined slab (i.e., the metaslab), while also operating as a receive array.
Adam M. Maunder, Lauren P. Smart, Léo J. E. Rémillard, Ashwin K. Iyer, Nicola De Zanche   +4 more
wiley   +1 more source

Quadrature Mismatch Shaping Techniques for Fully Differential Circuits

, 2008
ADCs require a feedback path for both the I and the Q part of the complex feedback signal. A complex DAC could give this feedback with near-perfect I/Q balance.
Abstract Quadrature Σ
core  

Geophysical investigation at Sainte‐Marguerite‐sur‐Mer (Normandy, France): From a supposed landfill to a forgotten military network?

Near Surface Geophysics, EarlyView.
Abstract This study focuses on characterising a strong and unexpected anomaly observed during an electromagnetic induction (EMI) survey conducted on the chalk cliff plateau at Sainte‐Marguerite‐sur‐Mer, in the Normandy region, France. The site was selected for a long‐term study of chalk cliff coastal erosion that began in 2017 and has been studied for ...
Sarah Thuillier, Cécile Finco, Fayçal Rejiba, Cyrille Fauchard   +3 more
wiley   +1 more source

Progressive emergence of canopy gravity waves during the afternoon–evening transition

Quarterly Journal of the Royal Meteorological Society, EarlyView.
Large‐eddy simulations are used to investigate the afternoon‐to‐evening transition of turbulence over a forest canopy and its coupling with atmospheric boundary‐layer dynamics. As surface cooling strengthens stability and weakens near‐canopy winds, canopy turbulence transitions progressively to internal gravity waves that dominate the evening flow ...
S. Dupont
wiley   +1 more source

Development of a novel strong-form meshless technique : random differential quadrature (RDQ) method with applications for 2-D multiphysics simulation of pH-sensitive hydrogel [PDF]

, 2019
Differential Quadrature (DQ) is one of the efficient techniques for derivative approximation, but it always requires a regular domain discretized with all the points distributed in a fixed pattern only along the straight lines. This severely restricts the DQ while solving problems with the irregular domain discretized by the random field nodes.
openaire   +3 more sources

Data‐driven emulation of flow‐dependent background‐error variance in variational data assimilation

Quarterly Journal of the Royal Meteorological Society, EarlyView.
A machine‐learning approach is developed to emulate flow‐dependent background‐error variance within a variational data assimilation framework. The method reproduces uncertainty information that would normally require a 50‐member ensemble using only five members, while maintaining comparable observation fit and forecast performance.
Wei Pan, Massimo Bonavita, Marcin Chrust, Elías Hólm   +3 more
wiley   +1 more source