نتایج جستجو برای: valve closing

تعداد نتایج: 123421  

Journal: :The Journal of experimental biology 2017
Kay Lammers Bettina Abeln Mirko Hüsken Christine Lehmacher Olympia Ekaterini Psathaki Esther Alcorta Heiko Meyer Achim Paululat

Drosophila harbours a simple tubular heart that ensures haemolymph circulation within the body. The heart is built by a few different cell types, including cardiomyocytes that define the luminal heart channel and ostia cells that constitute openings in the heart wall allowing haemolymph to enter the heart chamber. Regulation of flow directionality within a tube, such as blood flow in arteries o...

2009
A Cairns

This experimental work was concerned with comparison of inlet valve actuation strategies in a thermodynamic single cylinder spark ignition research engine equipped with a mechanical fully variable valvetrain on both the inlet and exhaust. The research involved study of the effects of the valvetrain on combustion, fuel economy and emissions when used to achieve variable valve timing alone and wh...

Journal: :European journal of cardio-thoracic surgery : official journal of the European Association for Cardio-thoracic Surgery 2006
Kazuyuki Ikeda Yukio Okazaki Kojirou Furukawa Satoshi Ohtsubo Junji Yunoki Masafumi Natsuaki Tsuyoshi Itoh

OBJECTIVE The optimal orientation of a bileaflet mechanical valve for tricuspid valve replacement (TVR) has not yet been determined. The aim of this study was to use fiberoptic cardioscopy to evaluate the effect of orientation of a mechanical valve implanted in the tricuspid position on bileaflet mechanical valve behavior. METHODS Twelve pigs (50-59 kg) underwent TVR with a St. Jude Mechanica...

Journal: :Journal of Marine Science and Engineering 2023

To bridge the gap that exists in key equipment of new subsea production control system, all-electric gate valve actuator, and exploit oil gas resources with high reliability safety while saving energy, this paper proposes a novel concept prototype an actuator which has functions redundant drive, failsafe closing, auxiliary override, position indication, low-power holding. It satisfied electrica...

2017
Wenbin Mao Andrés Caballero Raymond McKay Charles Primiano Wei Sun

In this study, we present a fully-coupled fluid-structure interaction (FSI) framework that combines smoothed particle hydrodynamics (SPH) and nonlinear finite element (FE) method to investigate the coupled aortic and mitral valves structural response and the bulk intraventricular hemodynamics in a realistic left ventricle (LV) model during the entire cardiac cycle. The FSI model incorporates va...

Journal: :Chest 1980
A D Waggoner M A Quiñones J B Young J G Nelson W L Winters P K Peterson R R Miller

Echo-phonocardiograms of 64 patients with multiple types of prosthetic mitral valves (PMV) were evaluated. Six patients demonstrated findings suggesting valve obstruction: four had surgical confirmation of prosthetic obstruction, one reduced cardiac output and pulmonary hypertension but no prosthetic dysfunction at surgery, and one is asymptomatic. Three of four patients with confirmed obstruct...

2013
Øystein A Vengen Michael Abdelnoor Arne S Westheim Gunnar Smith Nils Bj Fjeld

BACKGROUND Advances in the understanding of mitral valve pathology have laid to mitral valve plasty (MPL) as the procedure of choice of all the mitral intervention as compared to mitral valve replacement (MVR). MATERIAL AND METHODS A cohort of 355 patients with mitral valve disease operated between January 1993 to January 2007 with closing date first of mars 2011. There were 214 MPL and 141 M...

Journal: :Int. J. Control 2007
Stefano Di Gennaro Bernardino Castillo-Toledo Maria Domenica Di Benedetto

Conventional internal combustion engines use mechanical camshafts to command the opening and closing phases of the intake and exhaust valves. The lift valve profile is designed in order to reach a good compromise among various requirements of the engine operating conditions. In principle, optimality in every engine condition can be attained by camless valvetrains. In this context, electromagnet...

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