The prevalence of heterotopic gastric mucosa of the upper esophagus (inlet patch) has a wide range depending on the method and detail of examination. The inlet patch is believed to be a congenital malformation that rarely leads to symptoms. We aimed to quantify the prevalence of the inlet patch in a non-referred population and determine if there are any risk factors or associated symptoms. Men ...

Combined cycle systems have an important role in power generation. In the present study, three different configurations of combined Brayton and Rankine system are studied from perspective energy, exergy, exergoeconomic environmental perspectives. Results indicate that it depends on preferences criteria each decision maker to select best configuration among proposed as final configuration. For p...

A numerical simulation of a liquid overfeed system working with pure refrigerants in steady state conditions has been performed. The global algorithm is based on the sequential resolution of the different elements of the system (compressor, evaporator, condenser, ... ). For each element, a simplified mathematical model based on global balances of mass, momentum and energy is used. For the evapo...

A power divider (PD)/ power combiner (PC) with high quality factor and enhanced output ports isolation using substrate integrated waveguide (SIW) technology is proposed. An SIW cavity is designed to provide a high quality factor filtering response and an SMD resistor is attached between two output ports to realize the high isolation. The value of the applied resistor is calculated by using the ...

Computational fluid dynamics (CFD) is potentially a valuable tool for simulating the dispersion of air contaminants in workrooms. However, CFD-estimated airflow and contaminant concentration patterns have not always shown good agreement with experimental results. Thus, understanding the factors affecting the accuracy of such simulations is critical for their successful application in occupation...

An effective and robust thermal management system can control the temperature of lithium batteries maintain long service life high performance module. In this work, design optimization cylindrical battery packs based on air-cooled strategies are studied. Lumped model is implemented to investigate thermophysical characteristics single cell, experimental measurements used determine transient heat...

In this paper we introduce local approximation spaces for component-based static condensation (sc) procedures that are optimal in the sense of Kolmogorov. To facilitate simulations for large structures such as aircrafts or ships it is crucial to decrease the number of degrees of freedom on the interfaces, or “ports”, in order to reduce the size of the statically condensed system. To derive opti...

BACKGROUND AND PURPOSE The effect of flow diverter (FD) on hemodynamic changes observed in aneurysms is inevitably affected by the actual structural configuration of deployed FD. We studied the resultant hemodynamic changes after implantation of FDs using computational fluid dynamic simulations based on micro-computed tomography reconstructions in rabbit aneurysm model. METHODS The FDs by mic...

Air quality plays a significant role during the coronavirus pandemic. acts as spreading media well control measure for infection in polluted spaces. Insufficient ventilation around building may lead to rise of pollutants carrying virus. One way improve is by increasing air change rate. This study investigates rate effectiveness reducing droplets classroom. Cases with various layouts inlet and o...

implantable ports are used for intravenous infusion therapy and play an important role in management of oncology patients. these ports are best suited for patients requiring long-term therapy (>4 weeks). implanted ports provide reliable venous access protect peripheral access increase patients’ comfort through reducing repeated and difficult vein punctures allow for safe and comfortable adminis...