نتایج جستجو برای: horizontal cylinder or vertical cylinder in this research

تعداد نتایج: 17515622  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تربیت مدرس - دانشکده فنی مهندسی 1387

the outcome of this research is a practical framework for “idea generation phase of new product development process based on customer knowledge”. in continue, the mentioned framework implemented in a part of iran n.a.b market and result in segmenting and profiling this market. also, the critical new product attributes and bases of communication message and promotion campaigns extracted. we have...

Journal: :The Journal of experimental biology 2013
Sridhar Ravi James D Crall Alex Fisher Stacey A Combes

Our understanding of how variable wind in natural environments affects flying insects is limited because most studies of insect flight are conducted in either smooth flow or still air conditions. Here, we investigate the effects of structured, unsteady flow (the von Karman vortex street behind a cylinder) on the flight performance of bumblebees (Bombus impatiens). Bumblebees are 'all-weather' f...

2012
P. Mc IVER P. McIver

The framework of the linearised theory of water waves in the time domain is used to examine the horizontal motion of an unrestrained floating structure. One of the principle assumptions of the theory is that an infinitesimal disturbance of the rest state will lead to an infinitesimal motion of the fluid and structure. It has been known for some time that for some initial conditions the theory p...

Journal: :بینا 0
احمد شجاعی باغینی a shojaei baghini baghiatalah university of medical sciences, tehran, iranدانشگاه علوم پزشکی بقیه اله عباس ابوالحسنی a abolhassani basir eye center, tehran, iranتهران- خیابان جمالزاده شمالی- پلاک 255- مرکز چشم پزشکی بصیر- مرکز تحقیقات چشم علیرضا برادران رفیعی ar baradaran-rafii ophthalmic research center, shahid beheshti university of medical sciences, tehran, iranدانشگاه علوم پزشکی شهید بهشتی مهدی اصلانی m eslani school of medicne, tehran university of medical sciences, tehran, iranدانشکده پزشکی- دانشگاه علوم پزشکی تهران فرساد نوریزاده f noorizadeh school of medicne, tehran university of medical sciences, tehran, iranدانشکده پزشکی- دانشگاه علوم پزشکی تهران

purpose: to evaluate the visual outcomes of cross-cylinder ablation in laser in situ keratomileusis (lasik) for eyes with high astigmatic refractive errors and low spherical component. methods: we prospectively evaluated cross cylinder lasik in patients with high astigmatic refractive error but low spherical component over a period of 2 years. all procedures were performed with the nidek ec-500...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه اراک - دانشکده علوم انسانی 1389

this study investigates the cohesive devices used in the textbook of english for the students of psychology. the research questions and hypotheses in the present study are based on what frequency and distribution of grammatical and lexical cohesive devices are. then, to answer the questions all grammatical and lexical cohesive devices in reading comprehension passages from 6 units of 21units th...

Journal: :Cognition 1998
L Kotovsky R Baillargeon

Previous research indicates that, when shown a collision between a moving and a stationary object, 11-month-old infants believe that the size of the moving object affects how far the stationary object is displaced. The present experiments examined whether 6.5- and 5.5-month-old infants hold the same belief. The infants sat in front of a horizontal track; to the left of the track was an inclined...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه بیرجند - دانشکده ادبیات و علوم انسانی 1392

in new management approaches, in the organizations with inflexible structure, existing of red tapes and interruptions caused by limitations and also non-compliance with environmental changes, create demotivation among staff. with regard to the influence of job motivational potential and its relationship to the type of organizational structure( enabling and dissuasive), the goal of this research...

Journal: :تحقیقات موتور 0
محسن قاضی خانی m. ghazikhani محمد شریف زاده m. sharifzadeh امیر ارژنگ نیا a. arjangnia ابوالفضل شریف زاده a. sharifzadeh

in this study a heat exchanger is designed for cooling exhaust gas and an experiment is carried out to investigate the effect of exhaust gas recirculation (egr) temperature on destruction of the fuel’s availability due to combustion processes in idi diesel engine cylinder. to serve this aim an exergy analysis is conducted on the engine cylinder which provides all the availability terms by which...

2012
Avinash Chandra R. P. Chhabra

Natural convection heat transfer from a heated horizontal semi-circular cylinder (flat surface upward) has been investigated for the following ranges of conditions; Grashof number, and Prandtl number. The governing partial differential equations (continuity, Navier-Stokes and energy equations) have been solved numerically using a finite volume formulation. In addition, the role of the type of t...

2010
DAISUKE TAKAGI HERBERT E. HUPPERT

We investigate the dynamics of thin films driven by gravity on the outer surface of a cylinder and sphere. The surface is rigid, stationary and the axis of the cylinder is horizontal. An instantaneous release of a constant volume of fluid at the top of the cylinder or sphere results initially in a two-dimensional or axisymmetric current respectively. The resultant flow of a thin film of fluid i...

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