نتایج جستجو برای: velocity ratio

تعداد نتایج: 630497  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه ارومیه - دانشکده کشاورزی 1393

پایین بودن ظرفیت گرمای ویژه ی هوا و همچنین، پایین بودن ضریب انتقال حرارت جابه جایی مابین سیال هوای عبوری از مجرای کالکتور و صفحه ی جاذب حرارت، از مشکلات اصلی استفاده سیال هوا در کالکتورهای تخت خورشیدی می باشد. ایجاد ناهمواری در زیر صفحه ی جاذب حرارت از جمله روش های موثر در افزایش ضریب انتقال حرارت جابه جایی، شکستن زیرلایه ی آرام، به منظور افزایش سطح و زمان تماس هوا با صفحه ی جاذب حرارت در جریان...

Fudziah Ismail Ioan Pop, Norfifah Bachok Sarkhosh Seddighi

The main purpose of this paper is to introduce a boundary layer analysis for the fluid flow andheat transfer characteristics of an incompressible nanofluid flowing over a permeable isothermalsurface moving continuously. The resulting system of non-linear ordinary differential equations issolved numerically using the fifth–order Runge–Kutta method with shooting techniques usingMatlab and Maple s...

Journal: :Computer methods in biomechanics and biomedical engineering 2012
G Rauter L Baumgartner J Denoth R Riener P Wolf

In rowing, motor learning may be facilitated by augmented feedback that displays the ratio between actual mean boat velocity and maximal achievable mean boat velocity. To provide this ratio, the aim of this work was to develop and evaluate an algorithm calculating an individual maximal mean boat velocity. The algorithm optimised the horizontal oar movement under constraints such as the individu...

Journal: :Stroke 1999
C Ranke A Creutzig H Becker H J Trappe

BACKGROUND AND PURPOSE Accurate carotid Doppler examination is an important issue in the light of large endarterectomy trials, but recommended cutoff values for detection of >70% stenosis vary widely. Standardization of diagnostic criteria should consider patient variation and instrument variability. METHODS We prospectively analyzed various Doppler parameters in 44 patients undergoing caroti...

2009
T. Heindel

Concentric mixing experiments with velocity ratios of up to 6 have been completed using hardwood pulp of 1.0, 1.9, and 2.9% consistency and water. Qualitative observations reveal that by increasing the velocity ratio, the inner jet spread angle is found to be larger (i.e., the jet spreads faster) and the downstream mixing region is more uniform. Furthermore, local consistency measurements show ...

In the present paper, the Zelt algorithm has been extended for ray tracing through an anisotropic model. In anisotropic media, the direction of the propagated energy generally differs from that of the plane-wave propagation. This makes velocity values to be varied in different directions. Therefore, velocity modeling in such media is completely different from that in an isotropic media. The vel...

Journal: :Cardiovascular Diabetology 2003
Osamu Ogawa Tomio Onuma Sayaka Kubo Naomi Mitsuhashi Chie Muramatsu Ryuzo Kawamori

BACKGROUND Recently a new automatic device that measures brachial-ankle pulse wave velocity using an oscillometric method has been developed. However, the practical significance of brachial-ankle pulse wave velocity measurement remains uncertain. The purpose of this study was to examine the association between brachial-ankle pulse wave velocity and symptomatic cerebral infarction in patients wi...

The hydrodynamic studies of fluidized bed reactor has been reported in terms of pressure drop, minimum fluidization velocity and bed volume expansion to contribute to the optimization of the CNTs production parameters in fluidized bed reactors. Minimum fluidization velocity and pressure drop, as the most important parameters, were taken into account for the investigation of the hydrodynamic beh...

Journal: :Vision Research 2001
Hiroyasu Ujike Hiroshi Ono

The lower parallactic depth threshold is determined by (a) the ratio of relative image velocity to head velocity when the head moves fast (>13 cm/s) and (b) the motion threshold when the head moves slow (<13 cm/s). These two results are explained by a single system that codes the ratio of relative image velocity to head velocity, using the same image velocity signal as that used for motion perc...

A. Keshavarzi and M. J. Kazemzadeh Parsee,

Flow separation at water intake is the main cause of head loss and flow discharge reduction. &#10As a result, study of shape and size of separation is very essential when designing an optimum water intake. Water intake is normally built with a 90 degree angle to the main channel flow direction. However, the flow structure in this type of water intake consists of large separation size along wit...

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