نتایج جستجو برای: hydro mechanical valve

تعداد نتایج: 350357  

2014
A. P. S. Selvadurai A. P. Suvorov P. A. Selvadurai

Introduction Conclusions References

2011
E. CATALANO B. CHAREYRE A. CORTIS E. Catalano B. Chareyre A. Cortis E. Barthélémy

We present a model for fluid-saturated granular media coupled flow and mechanical deformation. The fluid is assumed to be incompressible and the solid part is assumed to be a cohesive granular material. Forces exerted by the fluid in motion are determinated and applied to solid particles. We derive a finite volumes formulation of the flow problem and we couple it to a discrete element method (D...

2007
De'an Sun Li Xiang

This paper presents a coupled elastoplastic constitutive model for predicting the hydraulic and stress-strain-strength behaviour of unsaturated soils. Hydraulic hysteresis in the water-retention behaviour is modeled as an elastoplastic process with the elastic region of the saturation degree. The effect of change in degree of saturation on the stress-strain-strength behaviour and the effect of ...

2016
Chadi Salmane Bhavi Pandya Kristen Lafferty Nileshkumar J Patel Donald McCord

Sixty percent of the patients going for valve replacement opt for mechanical valves and the remaining 40% choose bioprosthetics. Mechanical valves are known to have a higher risk of thrombosis; this risk further varies depending on the type of valve, its position, and certain individual factors. According to current guidelines, long-term anticoagulation is indicated in patients with metallic pr...

2013
Irfan Ghani Daniel Koehn Renaud Toussaint Cees Willem Passchier

Many natural examples of complex joint and vein networks in layered sedimentary rocks are hydro-fractures that form by a combination of pore fluid overpressure and tectonic stresses. In this paper, a two-dimensional hybrid hydro-mechanical formulation is proposed to model the dynamic development of natural hydrofractures. The numerical scheme combines a Discrete Element Model (DEM) framework th...

2017
Rafaela Cardoso

W W W .R U B .D E /S F B 8 3 7 The application of electrical energy during Electrokinetic Treatment (EKT) on soils has been well experimented in order to either consolidate (by dewatering) or decontaminate them. Several practical cases in the literature validate the use of this technique to improve the mechanical properties of soft clays in foundations, excavations and other geotechnical works....

2013
A. M. Tang Y. - J. Cui

1 INSTRODUCTION In the concept of geological radioactive waste disposal, argillite is being considered as a possible host rock in various countries such as France and Switzerland. This material is chosen thanks to its extremely low permeability that is required to limit the transfer of radioactive elements from the waste package towards the environment. During the construction and exploitation ...

Journal: :Acta cirurgica brasileira 2015
Maria Gabriela Cavicchia Toneloto Marcos Mello Moreira Joaquim Murray Bustorff-Silva Gabriel Franco de Souza Luiz Claudio Martins Desanka Dragosavac Antonio Luis Eiras Falcão

PURPOSE To assess the efficacy of an adjustable inspiratory occlusion valve in experimental bronchopleural fistula during mechanical ventilation. METHODS We studied six mechanically ventilated pigs in a surgically created, reproducible model of bronchopleural fistula managed with mechanical ventilation and water-sealed thoracic drainage. An adjustable inspiratory occlusion valve was placed be...

Journal: :JACC. Cardiovascular interventions 2015
Blase Carabello

S ymptomatic aortic stenosis (AS) is a fatal disease unless treated by transcatheter aortic valve replacement (TAVR). During the latter half of the 20th century, aortic valve replacement (AVR) was accomplished in the operating room using a variety of replacement valves, both mechanical and bioprosthetic, the choice of which steadily evolved over time. Bioprostheses avoid the need for vitamin K ...

2009
Eric M. Dunham Hiroyuki Noda

Field observations of maturely slipped faults show a generally broad zone of damage by cracking and granulation. Nevertheless, large shear deformation, and therefore heat generation, in individual earthquakes takes place with extreme localization to a zone <1–5 mm wide within a finely granulated fault core. Relevant fault weakening processes during large crustal events are therefore likely to b...

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