Results 71 to 80 of about 1,034,710 (311)

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

Mean Aortic pressure gradient and global longitudinal strain recovery after transcatheter aortic valve replacement – A retrospective analysis

Hellenic Journal of Cardiology, 2018
Background: Global longitudinal strain (GLS) has incremental value in assessing left ventricular (LV) function in severe aortic stenosis and is related to clinical outcome after transcatheter aortic valve replacement (TAVR).
Frank E. Corrigan, Xiao Zhou, John C. Lisko, Salim S. Hayek, Ioannis Parastatidis, Patricia Keegan, Sharon Howell, Vinod Thourani, Vasilis C. Babaliaros, Stamatios Lerakis   +9 more
doaj   +1 more source

Removing Oxide Layers and Retaining Oxide‐Free Steel Surfaces by Polishing in Oxygen‐Free Atmosphere

Advanced Engineering Materials, EarlyView.
In this study, the efficacy of wet mechanical polishing under an oxygen‐free atmosphere for deoxidation and the retention of an oxide‐free steel surface are elucidated using X‐ray photoelectron spectroscopy. The methodology proved successful; however, the results were highly dependent on the preparation of the solvents used to clean the samples after ...
Friedrich Bürger, Lienhard Wegewitz, Wolfgang Maus‐Friedrichs   +2 more
wiley   +1 more source

Effect of the Extent of Cardiac Damage on Transcatheter Aortic Valve Replacement Outcome: A New Aortic Stenosis Staging System

US Cardiology Review, 2020
Severe aortic stenosis (AS) causes chronic pressure overload of the left ventricle (LV), resulting in progressive cardiac change that can extend beyond the LV.
Miho Fukui, João L Cavalcante
doaj   +1 more source

Dual motion valve with single motion input [PDF]

, 1987
A dual motion valve includes two dual motion valve assemblies with a rotary input which allows the benefits of applying both rotary and axial motion to a rotary sealing element with a plurality of ports.
Belew, Robert
core   +1 more source

Interaction of Ladle Slag With Varying SiO2 Content and Recyclate‐Based MgO–C Refractories

Advanced Engineering Materials, EarlyView.
Ladle slags (CaO/Al2O3 = 1) with 1–20 wt% SiO2 were investigated in contact with industrial MgO–C refractories fabricated from fresh magnesia and 50 wt% recyclate. The sessile drop method at 1600°C reveals intensive gas formation, delayed slag infiltration in recyclate‐based samples, and, under high‐SiO2 slag, formation of a dense MgAl2O4‐rich ...
Anton Yehorov, Eldar Salpagarov, Anhelina Mospan, Till Manon Jannis Stadtmüller, Thomas Schemmel, Christos Georgios Aneziris, Olena Volkova   +6 more
wiley   +1 more source

Transseptal BATMAN for High-Risk Valve-in-Ring Procedures

JACC: Case Reports
Valve-in-ring procedures represent a feasible solution for high-risk patients with surgical repair failure. The risk of left ventricular outflow tract obstruction increases the challenge, and transcatheter approaches to prevent it are technically ...
Paolo Denti, MD, Matteo Saccocci, MD, Nicola Buzzatti, MD, Guido Ascione, MD, Davide Margonato, MD, Pamela Gatto, MD, Altin Palloshi, MD, Cristiano Sarais, MD, Matteo Longoni, RT, Francesco Maisano, MD   +9 more
doaj   +1 more source

Use of computer modeling to investigate a dynamic interaction problem in the Skylab TACS quad-valve package [PDF]

, 1975
A valve opening-response problem encountered during development of a control valve for the Skylab thruster attitude control system (TACS) is described. The problem involved effects of dynamic interaction among valves in the quad-redundant valve package ...
Gershman, R., Hesser, R. J.
core   +1 more source

TRANSCATHETER VALVE IN VALVE IMPLANTATION FOR FAILED BIOPROSTHETIC HEART VALVES [PDF]

Journal of the American College of Cardiology, 2010
Background— The majority of prosthetic heart valves currently implanted are tissue valves that can be expected to degenerate with time and eventually fail. Repeat cardiac surgery to replace these valves is associated with significant morbidity and mortality ...
Wood, David Alexander, Gurvitch, Ronen, Cheung, Anson, Ye, Jian, Leipsic, Jonathon, Horlick, Eric, Rodés-Cabau, Josep, Dumont, Eric, Osten, Mark, Wender, Olaf, Masson, Jean Bernard, Wijesinghe, Namal, Tay, Edgar, Nietlispach, Fabian, Johnson, Mark, Munt, Brad, Moss, Rob, Thompson, Christopher R., Lichtenstein, Samuel V., Webb, John G.   +19 more
openaire   +2 more sources

Copper Nanocrystallization in Anodic Oxide Films of Ti–Cu‐Based Bulk Metallic Glass and Its Effect on the Corrosion Resistance and Cytocompatibility

Advanced Engineering Materials, EarlyView.
Viktoriia Shtefan, Thorgund Nemec, Ute Hempel, Annett Gebert and coworkers demonstrate that anodic treatment of Ti–Cu‐based metallic glass in a nontoxic pyrophosphate electrolyte forms a protective bilayered Ti/Zr‐oxide film enriched with Cu nanocrystals.
Viktoriia Shtefan, Nora Fernández Navas, Thorgund Nemec, Ivan Kaban, Ute Hempel, Andrea Voss, Volker Hoffmann, Darius Pohl, Annett Gebert   +8 more
wiley   +1 more source