نتایج جستجو برای: jefferyhamel flow

تعداد نتایج: 481985  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی امیرکبیر(پلی تکنیک تهران) - دانشکده مهندسی مکانیک 1388

اخیرا استفاده از نانوسیال ها که در حقیقت سوسپانسیون پایداری از نانوفیبرها و نانو ذرات جامد هستند، به عنوان راهبردی جدید در فرآیندهای انتقال حرارت مطرح شده است. تحقیقات اخیر روی نانوسیالات، افزایش قابل توجهی را در هدایت حرارتی آنها نسبت به سیال پایه (سیال بدون ذرات) و یا سیالهای دارای ذرات دانه درشت تر (ماکروذرات) نشان می دهد. پژوهش های گوناگونی برای بررسی انتقال حرارت جابجایی در نانوسیال ها و ا...

Journal: Gas Processing 2014

 Understanding the flow behaviour in a gas well is crucial for future production strategies, obtaining bottomhole conditions from wellhead production data, analyzing production data and estimating reservoir properties. In this work, the pressure profile and flow regime are studied on four wells of a multi-well, multi-layer gas-condensate reservoir, producing at high rate. The wells are deviate...

منوچهر حیدرپور, , حسین افضلی مهر, , سید حسین فرشی, ,

In this study, two data ranges of uniform flow (bulk parameters) and non-uniform flow (local parameters) are employed to investigate resistance to flow and the factors affecting it using velocity distribution of boundary layer theory. The results indicate that the cross-section form factor or adjustment roughness coefficient of logarithmic law can not improve the prediction of flow resistance....

ژورنال: علوم آب و خاک 2003
منوچهر حیدرپور, , حسین افضلی مهر, , سید حسین فرشی, ,

In this study, two data ranges of uniform flow (bulk parameters) and non-uniform flow (local parameters) are employed to investigate resistance to flow and the factors affecting it using velocity distribution of boundary layer theory. The results indicate that the cross-section form factor or adjustment roughness coefficient of logarithmic law can not improve the prediction of flow resistance....

A ASGARI, A KHOSHBATEN, S HAJIZADEH,

Previous studies have shown that electrical stimulation (ES) increases blood flow, but the exact mechanisms are not clear. The present study was designed to clarify some of the underlying mechanisms involved in this phenomenon. White adult rabbits Lt.-6 months old were used. Animals were anesthetized by sodium pentobarbital (40 mg/kg, IV) and skin blood flow in the thoracic back was recorde...

Journal: :desert 2010
a. malekian t. zinati sh. khalighi sigaroudi

abstract stochastic model for synthetic data generation is not available for daily flows of intermittent streams. such a model is required in the planning and operation of structures on an intermittent stream for purposes where short time flow fluctuations are important. in this study a model is developed for such a case. the model consists of four steps: determination of the days on which flow...

Background: Laminar flow ventilation systems were developed to reduce surgical contamination in joint arthroplastyto avoid periprosthetic joint infection (PJI). The goals of this study are to evaluate the cost-effectiveness and economicviability of installing and maintaining a laminar flow system in an operating room.Methods: A Monte Carlo simulation was used to evaluate the c...

Journal: :anesthesiology and pain medicine 0
sohrab negargar cardiovascular research center, tabriz university of medical sciences, tabriz, iran ali peirovifar department of anesthesiology, faculty of medicine, tabriz university of medical sciences, tabriz, iran ata mahmoodpoor department of anesthesiology, faculty of medicine, tabriz university of medical sciences, tabriz, iran; department of anesthesiology, faculty of medicine, tabriz university of medical sciences, tabriz, ir iran. tel: +98-9141160888, fax: +98-4133341994 masoud parish department of anesthesiology, faculty of medicine, tabriz university of medical sciences, tabriz, iran samad ej golzari cardiovascular research center, tabriz university of medical sciences, tabriz, iran haniye molseqi student research committee, tabriz university of medical sciences, tabriz, iran

results the mean heart rate values were significantly less in the sevoflurane group (p value < 0.05) at 25 minutes after the surgery. the mean blood pressure in the isoflurane group was significantly higher compared with the sevoflurane group in 10, 20 and 30 minutes after the surgery (p values = 0.0131, 0.0373 and 0.0028, respectively). these differences were clinically unimportant because hea...

Journal: :caspian journal of environmental sciences 2011
a. cocos o. cocos* i. sarbu

this paper seeks to emphasize the flow variability in the calnistea catchment by analyzing the local physiographic factors. the research has shown that the amount of precipitation that falls to the ground is low, the rocks in the region are soft, but highly permeable, gradients are gentle in most of the territory and vegetal cover is sparse and therefore cannot hold important amounts of water. ...

Journal: :modares journal of medical sciences: pathobiology 2012
parisa ebrahimisadr fatemeh ghaffarifar zuhair mohammad hassan nasibeh beheshti

objective: leishmaniasis is one of the significant causes of morbidity and mortality in several countries. it is an important problem in endemic areas such as iran. the goal in treatment of leishmaniasis is to reduce the disease period and leave no evidence of any remaining scars or lesions. a derivative of artemisinin is artemether. scientists believe that the strong action of artemether again...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید