نتایج جستجو برای: velopharyngeal valve
تعداد نتایج: 108525 فیلتر نتایج به سال:
مقدمه: دریچه های بینی (nasal valve) عمده ترین محل ایجاد مقاومت در برابر جریان هوا می باشند و توجه بیشتر به شکل و زوایای آنها مشخصا سبب می شود نتایج بهتری در اعمال جراحی در بیماران دچار گرفتگی بینی حاصل شود. در این مطالعه میزان فراوانی اشکال مختلف زاویه nasal valve در بیماران دچار گرفتگی بینی مراجعه کننده به کلینیک ent بیمارستان بوعلی تهران در سال 1390 مورد بررسی قرار گرفت. روش مطالعه: در این ...
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. ...
Since knowledge on hydrodynamic torque of a butterfly valve is very important for butterfly valve design, its hydrodynamic torque is investigated in this paper. In reality, the investigation of the loss coefficient and torque from some experiments will take a long time and a lot of money. This paper presents a statistical study of the flow past the butterfly valve in a static analysis using com...
Introduction: Prosthetic valve thrombosis is a rare and severe complication of valve replacement, most often encountered with a mechanical prosthesis. The significant morbidity and mortality associated with this condition warrant rapid diagnostic evaluation. Although surgery is the first-line therapy in symptomatic obstructive mechanical valve thrombosis, thrombolytic therapy has been used as a...
A computational optimization was performed for a direct-injection diesel engine using three-dimensional modeling. Fully transient CFD analyses of different valve profile strategies for the intake and compression strokes were performed to evaluate the effects on both engine performance and in-cylinder flow-field evolution. The turbulence model was used along with the second order linear upwin...
Small diesel engines are widely used for commercial vehicle and passenger car applications due to their higher torque requirements, fuel economy, and better thermal efficiency. These engines are exposed to different operating and environmental conditions and hence emissions from these engines are erratic. Strategies are required to enhance performance and reduce engine-out emissions considering...
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