Results 51 to 60 of about 2,688,635 (294)

A rare case series of mechanical prosthetic heart valve structural deterioration presented as severe mitral regurgitation

Heart Vessels and Transplantation, 2023
Objective: Structural valve deterioration in the form of stenosis or regurgitation or both though being a rare complication with newer generation mechanical heart valves can occur and can be critical.
Jignesh Kothari, Sandip Lukhi, Utkarsh Sanghavi, Devvrat Desai , Ishan Gohil   +4 more
doaj   +1 more source

A Valve Design Methodology For Improved Reciprocating Compressor Performance [PDF]

, 2012
The current work directly relates valve dynamics to the compressor energy efficiency. Majority of the previous studies have focused on reducing pressure losses due to valve geometry, towards improved compressor performance.
Angadi, Shruti, Bahadur, Vaibhav, Dhar, Sandeep, Dey, Subhrajit, Bhakta, Aditya   +4 more
core   +1 more source

Prosthetic Aortic Valves: Challenges and Solutions

Frontiers in Cardiovascular Medicine, 2018
Aortic Valve Disease (AVD) is the most common Valvular Heart Disease (VHD), affecting millions of people worldwide. Severe AVD is treated in most cases with prosthetic aortic valve replacement, which involves the substitution of the native aortic valve ...
Lucia Musumeci, Nicolas Jacques, Alexandre Hego, Alain Nchimi, Patrizio Lancellotti, Patrizio Lancellotti, Patrizio Lancellotti, Cécile Oury   +7 more
doaj   +1 more source

Air‐Pressure–Actuated Vibroacoustic Metamaterial With Tunable Bandgap: Design, Modeling, and Characterization

Advanced Engineering Materials, EarlyView.
This article presents the design, modeling, and characterization of air‐pressure–actuated programmable vibroacoustic metamaterials (PVAMM). The study focuses on leveraging air pressure to dynamically tune resonance frequencies for effective noise attenuation.
William Kaal, Michael M. Becker, Sarah C. L. Fischer   +2 more
wiley   +1 more source

Outcomes after bioprosthetic versus mechanical mitral valve replacement for infective endocarditis in the United StatesCentral MessagePerspective

JTCVS Open
Objective: In patients who underwent mitral valve replacement for infectious endocarditis, we evaluated the association of prosthesis choice with readmission rates and causes (the primary outcomes), as well as with in-hospital mortality, cost, and length
Katie J. Hogan, BS, Christopher B. Sylvester, MD, PhD, Matthew J. Wall, Jr., MD, Todd K. Rosengart, MD, Joseph S. Coselli, MD, Marc R. Moon, MD, Subhasis Chatterjee, MD, Ravi K. Ghanta, MD   +7 more
doaj   +1 more source

An Intelligent Correlation Real-Time Analysis Method for the Mechanical Properties of Members in Super-Span Valve Hall Grid Structure Hoisting Process

Sensors, 2022
The mechanical performance analysis of the members is the primary basis for evaluating the hoisting quality and safety of the valve hall grid structure.
Qinghe Zeng, Jin Liao, Xionghui Huang, Weihua Ming, Yi Gao, Cuiying Zhou, Zhen Liu   +6 more
doaj   +1 more source

Symbolic Regression and Multi‐Objective Optimization of the Flory–Huggins Interaction Parameter for Hydrogels

Advanced Engineering Materials, EarlyView.
We develop a data‐driven method to derive the mathematical expressions of the Flory–Huggins interaction parameter χ for the swelling behavior of temperature–responsive hydrogels. Starting from initial assumptions of χ, our workflow combines Bayesian optimization, Flory–Rehner theory, and symbolic regression to generate candidate χ expressions.
Yawen Wang, Adrian Ehrenhofer, Thomas Wallmersperger   +2 more
wiley   +1 more source

#4 Surgical Outcomes and Decision Making for Bicuspid Aortic Valve

Graduate Medical Education Research Journal
Mentor: Angela Yetman Program: Pediatrics – Cardiology Type: Original Research Background: Bicuspid aortic valve (BAV) is the most common congenital heart lesion and is associated with aortic stenosis or regurgitation, endocarditis, and/or ascending ...
Adam Larsen, David Danford, Angela Yetman   +2 more
doaj   +1 more source

OntOMat: Toward Ontology‐Based Product and Process Design Engineering and Optimization Solutions Fueling Circular Value Chains

Advanced Engineering Materials, EarlyView.
The OntOMat ontology establishes a structured framework for polymer matrix fiber reinforced composite materials, integrating manufacturing processes, characterization methods, and multiscale design through the VDI/VDE 3682 formalized process description standard.
Nicolas Christ, Jörg Hohe, Martin Kördel, Michael Giese, Niklas Toffert, Christian Seidel, Olaf Rehme, Patrik Schneider, Oliver Focke, Elie Abi Aoun, Claas Falldorf, Beñat Gutierrez, Alexandra Kühn, Sven Torstrick-von der Lieth, Christoph Herden, Erik Johannsen, Jan‐Uwe R. Schmidt, Felix Winkelmann, Andreas Schott, Daniel Schott   +19 more
wiley   +1 more source

The mechanism of opening of the aortic valve

The Journal of Thoracic and Cardiovascular Surgery, 1979
The mechanism of opening of the aortic valve was investigated in dogs by attaching radiopaque markers to the commissures and the leaflets. Analysis of abnormal cardiac cycles demonstrated that, when the ventricular pressure first equalled the aortic pressure, the intercomissural distances increased 9 percent, and the valve opened with a stellate ...
M, Thubrikar, L P, Bosher, S P, Nolan
openaire   +2 more sources