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Combined Effects of Centrifugal and Coriolis Instability of the Flow through a Rotating Curved Duct with Rectangular Cross Section

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Open Journal of Fluid Dynamics 2014年第1期4卷 1-14页

作者： Rabindra Nath Mondal samir chandra Ray Shinichiro Yanase Department of Mathematics Bangabandhu Sheikh Mujibur Rahman Science and Technology University Gopalganj Bangladesh Department of Mathematics Jagannath University Dhaka Bangladesh Department of Mechanical and System Engineering Faculty of Engineering Okayama University Okayama Japan

Combined effects of centrifugal and coriolis instability of the flow through a rotating curved duct with rectangular cross section have been studied numerically by using a spectral method, and covering a wide range of the Taylor number ?for a constant Dean number. The rotation of the duct about the center of curvature is imposed in the positive direction, and the effects of rotation (Coriolis force) on the flow characteristics are investigated. As a result, multiple branches of asymmetric steady solutions with two-, three-and multi-vortex solutions are obtained. To investigate the non-linear behavior of the unsteady solutions, time evolution calculations as well as power spectrum of the unsteady solutions are performed, and it is found that the unsteady flow undergoes through various flow instabilities in the scenario “chaotic?→ multi-periodic?→ periodic?→ steady-state”, if Tr is increased in the positive direction. The present results show the characteristics of both the secondary flow and axial flow distribution in the flow.

关键词： Rotating Curved Duct Dean Number Taylor Number Secondary Flow Periodic Solution

Simulation in endoscopy:Practical educational strategies to improve learning

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World Journal of Gastrointestinal Endoscopy 2019年第3期11卷 209-218页

作者： Rishad Khan Michael A Scaffidi samir C grover Nikko Gimpaya Catharine M Walsh Department of Medicine Schulich School of Medicine and Dentistry Western University Division of Gastroenterology St. Michael’s Hospital University of Toronto Department of Medicine University of Toronto Faculty of Health Sciences School of Medicine Queen’s UniversityKingston Division of Gastroenterology Hepatology and Nutrition and the Research and Learning Institutes Hospital for Sick Children University of Toronto Department of Paediatrics Faculty of Medicine University of Toronto The Wilson Centre Faculty of Medicine University of Toronto

In gastrointestinal endoscopy, simulation-based training can help endoscopists acquire new skills and accelerate the learning curve. Simulation creates an ideal environment for trainees, where they can practice specific skills, perform cases at their own pace, and make mistakes with no risk to patients. Educators also benefit from the use of simulators, as they can structure training according to learner needs and focus solely on the trainee. Not all simulation-based training,however, is effective. To maximize benefits from this instructional modality,educators must be conscious of learners' needs, the potential benefits of training,and associated costs. Simulation should be integrated into training in a manner that is grounded in educational theory and empirical data. In this review, we focus on four best practices in simulation-based education: deliberate practice with mastery learning, feedback and debriefing, contextual learning, and innovative educational strategies. For each topic, we provide definitions,supporting evidence, and practical tips for implementation.

关键词： Simulation Endoscopy Gastrointestinal Education

Status of serum vitamin D and neurological disorder in Nepalese population:a prospective study

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Life Research 2020年第4期3卷 148-157页

作者： Avinash chandra Basant Pant Ayush chandra Pooja Prakash Reema Rajbhandari Sharad Gajuryal Pranaya Shrestha samir Acharya Pravesh Rajbhandari Resha Shrestha Annapurna Neurological Institute and Alied Scinces MaitigharKathmanduNepal Tianjin Medical University TianjinChina Gandaki Medical College and Teaching Hospital PokharaNepal

Background:Recently,there has been a surge in research worldwide on vitamin *** on international level,Vit.D has shown positive correlation with cardio-cerebrovascular *** possible role of vitamin D there is paucity of research in low-and middle-income nations that are nearer to the equatorial *** of abundant sunlight exposure,Asian people are developing hypovitaminosis D need a special consideration to avoid excessive and unnecessary usage of *** study aims to detect the situation of vitamin D in Nepalese population and secondly to find out the suitable normalized reference range for serum vitamin D in multi-ethnic Nepalese ***:A hospital based prospective study was conducted using purposive sampling technique to select 107 ***-vivo and in vitro bio-physiological method was used to collect serum vitamin D ***:The present study showed that 32%of participants had deficit(30 ng/mL).Study showed that there is a lower degree of positive relationship of body mass index(r=0.162,P=0.094)and significant association of history of chronic illness(χ2=0.10,P=0.03),timing of occurrence of stroke(χ2=11.41,P=0.017)and diagnosis(χ2=21.19,P=0.011)with serum vitamin-D level at P<***:There is a direct significant association of serum vitamin D with socio-demographic variables when international unit is *** disorder showed positive association with serum vitamin D level.

关键词： Serum vitamin D Neurological disorder Deficiency Incidence

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轮胎彩色胎面胶料的磨耗行为(英文)

轮胎彩色胎面胶料的磨耗行为(英文)