Sectionalized gate valves can reduce the volume of product released in event a buried pipeline failure or rupture. The risk is constant and common occurrence, many factors lead to incidents. In this paper, free undamped vibration pipeline, sectionalized valve structure, dynamics fluid passing through system are investigated. First foremost, modal analysis based on finite element (FEA) introduce...

Valvular heart disease is one of the most dynamic and exciting fields in cardiovascular medicine, with significant developments in investigation and management over recent years. In this review, we cover some of the most exciting areas, including the potential for treatment strategies aimed at halting the progression of early aortic stenosis, the use of positron emission tomography in assessing...

A general fault model on alternative graphs (AG) was developed to cover traditional functional and gate-level fault models for digital systems. The advantage of the new approach is that a uniform fault activating procedures on AG-s are applicable for different types of traditional faults. Also, it is not needed to represent functional faults explicitly by fault lists, the faults can be derived ...

The hot gases produced by the internal combustion engines passes through the exhaust valve and causes high temperatures in the exhaust valve and its seat. To avoid damaging the exhaust valve, heat must be transferred from the valve to its seat during the contact they make at the opening and closing cycle. Heat transfer rate from the exhaust valve to its seat is a function of many factors. One o...

Front Cover: Currently available heart valve prostheses have no growth potential, requiring children with diseases to endure multiple replacement surgeries. In article number 2300011, David Kalfa, Jeffrey W. Kysar, Richard L. Li and co-workers develop the proof of concept a polymeric valved conduit that can be expanded by transcatheter balloon dilation accommodate patient growth.

The ribbed mussel, Geukensia granosissima, cycles nutrients, contributes to soil stability, and can be a major component of predator-prey communities in salt marshes. Mussels were exposed the 2010 Deepwater Horizon oil spill Gulf Mexico, marshes remain contaminated eight years later. We hypothesized that oiled mussels had reduced annual growth, altered population size frequency, perhaps changed...

introduction: rheumatic heart disease still remains one of the leading causes of congestive heart failure and death owing to valvular pathologies, in developing countries. valve replacement still remains the treatment of choice in such patients.the aim of this study wasto analyze the postoperative outcome of  double valve replacement (mitral and aortic ) in patients of rheumatic heart disease. ...

We consider two optimization problems with geometric structures The rst one con cerns the following minimization problem termed as the rectilinear polygon cover problem Cover certain features of a given rectilinear polygon possibly with rectilinear holes with the minimum number of rectangles included in the polygon Depending upon whether one wants to cover the interior boundary or corners of th...

objective: different categories are available for estimating of radiation dose. radioisotopes with the same energy and almost the same physical properties have similar effects. monte carlo technique is a computerized method based on mathematical simulation of physical processes. the main purpose of this study is to show that beta particles are not able to penetrate deep into the water. also dif...

infective endocarditis is one of the most severe complications of parenteral drug abuse. the outstanding clinical feature of infective endocarditis in intravenous drug abusers is the high incidence of right-sided valve infection, and the tricuspid valve is involved in 60% to 70% of the cases. we herein report a case of isolated pulmonic valve infective endocarditis with a native pulmonary valve.