Results 21 to 30 of about 584,535 (262)

Effectiveness and safety of transcatheter aortic valve replacement in elderly people with severe aortic stenosis with different types of heart failure

open access: yesBMC Cardiovascular Disorders, 2023
Background Impaired left ventricular function is an independent predictor of adverse clinical outcomes in patients with aortic stenosis. The aim of this study is to evaluate the short-term changes of echocardiographic parameters, New York Heart ...
Mei Dong   +7 more
doaj   +1 more source

Lattice ellipsoidal statistical BGK model for thermal non-equilibrium flows [PDF]

open access: yes, 2012
A thermal lattice Boltzmann model is constructed on the basis of the ellipsoidal statistical Bhatnagar-Gross-Krook (ES-BGK) collision operator via the Hermite moment representation.
Nicolas G. Hadjiconstantinou   +11 more
core   +1 more source

Exploring the Charge Compensation Mechanism of P2-Type Na0.6Mg0.3Mn0.7O2 Cathode Materials for Advanced Sodium-Ion Batteries

open access: yesEnergies, 2020
P2-type sodium layered transition metal oxides have been intensively investigated as promising cathode materials for sodium-ion batteries (SIBs) by virtue of their high specific capacity and high operating voltage.
Chen Cheng   +7 more
doaj   +1 more source

Identification of gene pathways implicated in Alzheimer's disease using longitudinal imaging phenotypes with sparse regression. [PDF]

open access: yes, 2012
We present a new method for the detection of gene pathways associated with a multivariate quantitative trait, and use it to identify causal pathways associated with an imaging endophenotype characteristic of longitudinal structural change in the brains ...
Alzheimer's Disease Neuroimaging Initiative   +6 more
core   +1 more source

Electric Power Loss Minimization in Power Supply Systems for the Suburban Houses [PDF]

open access: yesProblems of the Regional Energetics, 2018
The main purpose of the research is the development and improvement of methods for minimizing power losses for non-sinusoidal and asymmetric modes of operation of power supply systems for suburban houses.
Averbukh М.А.   +2 more
doaj   +1 more source

A Numerically Stable Reduced-gradient Type Algorithm For Solving Large-scale Linearly Constrained Minimization Problems [PDF]

open access: yes, 2015
In this paper we present a reduced-gradient type algorithm for solving large-scale linearly constrained minimization problems. During each iteration of the algorithm linear systems are solved using a preconditioned conjugate-gradient scheme.
Martinez J.M., Gomes H.S.
core   +1 more source

Adapted Nested Force-Gradient Integrators: The Schwinger Model Case [PDF]

open access: yes, 2017
We study a novel class of numerical integrators, the adapted nested force-gradient schemes, used within the molecular dynamics step of the Hybrid Monte Carlo (HMC) algorithm.
Dmitry Shcherbakov   +5 more
core   +1 more source

Flows of singular vector fields and applications to fluid and kinetic equations [PDF]

open access: yes, 2015
Several physical phenomena arising in fluid dynamics and kinetic equations can be modeled by nonlinear transport PDE. Such quantities are the vorticity of a fluid, or the density of a collection of particles advected by a velocity field which is highly ...
Bohun, Anna
core   +1 more source

Extrapolation vs. projection methods for linear systems of equations [PDF]

open access: yes, 1988
It is shown that the four vector extrapolation methods, minimal polynomial extrapolation, reduced rank extrapolation, modified minimal polynomial extrapolation, and topological epsilon algorithm, when applied to linearly generated vector sequences, are ...
Sidi, Avram
core   +1 more source

Medium term follow-up after percutaneous pulmonary valve replacement with the Melody® valve

open access: yesInternational Journal of Cardiology: Heart & Vasculature, 2015
Introduction: Data on long term function of the Melody valve are scarce. Patients and methods: single institution; results of percutaneous pulmonary valve implantation (PPVI) from 2006 to 2014.
Bjorn Cools   +7 more
doaj   +1 more source

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