نتایج جستجو برای: helical rib

تعداد نتایج: 34674  

Journal: :international journal of energy and environmental engineering 2011
s hossainpour r hassanzadeh

this paper presents a three-dimensional numerical investigation carried out in turbulent forced convection in a tube with helical ribs. enhancement of heat transfer using helically corrugated tubes has beenstudied experimentally by many researchers but there exist a few published numerical analyses results. the paper also introduces the results of heat transfer and friction factor data for inco...

2015
Shen-Song Kang Ying Guo Dong-Yi Zhang Du-Yin Jiang

BACKGROUND The optimal age at which to initiate for auricular reconstruction is controversial. Rib cartilage growth is closely related to age and determines the feasibility and outcomes of auricular reconstruction. We developed a method to guide the timing of auricular reconstruction in children with microtia ranging in age from 5 to 10 years. METHODS Rib cartilage and the healthy ear were as...

Journal: :the archives of bone and joint surgery 0
seyed hosein fattahi masoum department of thoracic surgery, mashhad university of medical sciences, mashhad, iran ali moradi orthopedic research center, mashhad university of medical sciences, mashhad, iran mohammad hosein ebrahimzadeh orthopedic research center, mashhad university of medical sciences, mashhad, iran

a seven year-old boy with several painless masses on the ribs and shoulder was referred to our hospital. the masses were so prominent that they prevented the child’s sleep. since the patient had been ridiculed by his friends due to the rib prominences, he had refused to attend school. after clinical and radiological evaluations, the masses were diagnosed as hereditary multiple exostoses of the ...

Journal: :iranian journal of radiology 0
joon young park department of radiology, chonnam national university hospital, gwangju, korea jin gyoon park department of radiology, chonnam national university hospital, gwangju, korea seung jin lee department of radiology, chonnam national university hospital, gwangju, korea; department of radiology, chonnam national university hospital, gwangju, korea. tel: +82-622205146, fax: +82-622264380

hemangioma of the rib is a rare benign vascular tumor. herein, we report a 63-year-old man presenting with hemangioma of the left sixth rib. an osteolytic eccentric expansive mass with calcification and focal cortical disruption was detected on chest computed tomography (ct). the mass showed low 2-deoxy-2-[18f]-fluoro-d-glucose (18f-fdg) avidity on positron emission tomography. the patient unde...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه محقق اردبیلی - دانشکده کشاورزی و منابع طبیعی 1392

برآورد دقیق مقدار تغذیه ی طبیعی آب زیرزمینی برای مدیریت مناسب سیستم آب زیرزمینی ضروری می باشد. مقدار تغذیه ی آب زیرزمینی مولفه مهمی در مدل کردن جریان و آلودگی آب زیرزمینی می باشد. روش های زیادی برای برآورد مقدار تغذیه وجود دارد. در این پژوهش، بر اساس اطلاعات هیدروژئولوژیکی موجود سه روش crd، rib و wtf برای برآورد تغذیه ی طبیعی آب زیرزمینی آبخوان اردبیل انتخاب شد. هر سه روش مبتنی بر بیلان آب هستن...

Primary hyperparathyroidism is a benign disease and is most often diagnosed during routine calcium measurement. It would be astonishing if a patient is symptomatic, but the diagnosis is neglected. A 56-year-old woman was admitted with complaint of localized pain in the chest wall following a regular bending and straightening. CXR showed a mass like lesion of the chest wall on the left and also ...

Journal: :acta medica iranica 0
z moinfar f. davari tanha z. moinfar m. kaveh s. eftekhari s. eftekhari z. khalilpour

short rib polydactyly syndrome (srps) is a very rare congenital anomaly that is classified into four subtypes. it is an autosomal recessive inherited disease. we report a case of this syndrome without a previous family history of congenital defects.

سعداله ابراهیمی, , مهدی اسماعیل‌زاده, ,

  A detailed analysis of electron trajectories in a realizable helical wiggler free electron laser with ion channel guiding using electron (single particle dynamics) is presented. Conditions for stability of electron orbit have been investigated, calculations are made to illustrate. Conclusion shows that there are differences stable (unstable) condition(s) electron trajectories between ideal he...

Journal: :The International Journal of Advanced Manufacturing Technology 2021

Cold helical rolling (CHR) is one of the most effective ways to produce small-diameter steel balls. In this study, kind work hardening model was established and implemented into Simufact 15.0 investigate phenomenon in cold forming process. Firstly, based on theory, a set finite element (FE) simulations developed. The influence CHR parameters, including starting height convex rib, area length, i...

Journal: :archives of trauma research 0
brandon c. chapman department of surgery, university of colorado school of medicine, colorado, united states; department of surgery, university of colorado school of medicine, colorado, united states. tel: +1-7207373858 douglas m. overbey department of surgery, university of colorado school of medicine, colorado, united states feven tesfalidet school of medicine, university of colorado, colorado, united states kristofer schramm department of radiology, school of medicine, university of colorado, colorado, united states robert t. stovall department of surgery, denver health medical center, colorado, united states andrew french department of emergency medicine, denver health medical center, denver, co, united states

methods retrospective cohort study of blunt trauma patients with rib fractures at a level i trauma center that had both a cxr and a ct chest. the ct finding of ≥ 3 additional fractures in patients with ≤ 3 rib fractures on cxr was considered clinically meaningful. student’s t-test and chi-square analysis were used for comparison. results we identified 499 patients with rib fractures: 93 (18.6%)...

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