نتایج جستجو برای: flow stress prediction

تعداد نتایج: 1137379  

Journal: :journal of hydraulic structures 2013
m.t. alami m. a. ghorbani l. malekani

analyses and investigations on river flow behavior are major issues in design, operation and studies related to water engineering. thus, recently the application of chaos theory and new techniques, such as chaos theory, has been considered in hydrology and water resources due to relevant innovations and ability. this paper compares the performance of chaos theory with anfis model and discusses ...

Journal: :زراعت دیم ایران 0
نادر دادخواه گروه زراعت، دانشکده کشاورزی، دانشگاه محقق اردبیلی، اردبیل، ایران علی عبادی گروه زراعت، دانشکده کشاورزی، دانشگاه محقق اردبیلی، اردبیل، ایران قاسم پرمون گروه زراعت، دانشکده کشاورزی، دانشگاه محقق اردبیلی، اردبیل، ایران عبدالقیوم قلی پوری گروه زراعت، دانشکده کشاورزی، دانشگاه محقق اردبیلی، اردبیل، ایران سودابه جهانبخش گروه زراعت، دانشکده کشاورزی، دانشگاه محقق اردبیلی، اردبیل، ایران

in order to study the effect of foliar zinc spraying on photosynthetic pigments and yield of chickpea under water stress conditions, a factorial experiment carried out based on randomized completely block design (rcbd) with three replications in university of mohaghegh ardabili agricultural research station in 2012. the treatments consisted of three levels of irrigation (irrigated at planting, ...

1999
Christophe Josserand

We propose a model to describe the quasistatic shearing of dry granular materials, which captures the differences in velocity profiles recently observed in 2 and 3-D Couette flow experiments. In our scheme, the steady-state flow is due to the intermittent motion of particle clusters moving together with the wall. The motion of a cluster is associated with the formation of a fracture in the pack...

2009
F. Mendonça D. Palfreyman A. Peck

ABSTRACT This paper supports a concerted effort towards validating an unstructured finite volume methodology for combined flow, thermal and stress analysis of turbine blades. In this part, CFD and conjugate heat transfer solutions are compared against measured surface pressure and heat transfer profiles on the C3X turbine. Sensitivities of the prediction to inlet turbulence levels and laminar-t...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تبریز 1381

deposite the different criticisms on contrastive analysis it has been proved that the results of it(when processed)can be usuful in a tefl environment,specially at the level of phonology.this study is an attempt to compare and contrast the sound systems of kurdish and english for pedagogical aims. the consonants,vowels,stress and intonation of the twolanguages are described by the same model-ta...

2017
Fei Fan Bingchen Liang Yaru Li Yuchuan Bai Yanjun Zhu Zhixia Zhu

Rigid-lid approximation is usually used to replace the free surface in scour simulation. The influence of the rigid lid assumption on the prediction precision of scour hole in steady flow is studied in this paper. Firstly, a local scour model was constructed based on the open sources Computational Fluid Dynamics (CFD) model OpenFOAM, where both the bed load and suspended load were considered. I...

Journal: :international journal of advanced design and manufacturing technology 0
meysam mohamadali department of mechanical and aerospace engineering, science and research branch, islamic azad university, tehran, iran nariman ashrafi department of mechanical and aerospace engineering, science and research branch, islamic azad university, tehran, iran

high weissenberg boundary layer flow of viscoelastic fluids on a stretching surface has been studied. the flow is considered to be steady and two dimensional. flows of viscoelastic liquids at high weissenberg number exhibit stress boundary layers near walls. these boundary layers are caused by the memory of the fluid. upon proper scaling and by means of an exact similarity transformation, the n...

2004
Gerrit W.M. Peters

A computational model for the combined processes of quiescent and flowinduced crystallization of polymers is presented. This modelling should provide the necessary input data, in terms of the structure distribution in a product, for the prediction of mechanical properties and shapeand dimensional-stability. Rather then the shear rate as the driving force, a viscoelastic approach is proposed, wh...

2004
Tuğrul Özel Erol Zeren

Finite Element Analysis (FEA) based techniques have become increasingly available to simulate metal cutting process and offer several advantages including prediction of tool forces, distribution of stresses and temperatures, estimation of tool wear, optimization of cutting conditions, tool edge geometry and coatings, and determination of residual stresses on machined surfaces. However, accuracy...

Journal: :international journal of civil engineering 0
l. zhang beijing university of technology

short-term traffic flow forecasting plays a significant role in the intelligent transportation systems (its), especially for the traffic signal control and the transportation planning research. two mainly problems restrict the forecasting of urban freeway traffic parameters. one is the freeway traffic changes non-regularly under the heterogeneous traffic conditions, and the other is the success...

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