نتایج جستجو برای: turbulent spot

تعداد نتایج: 67786  

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2013
Rodrigo R Taveira José S Diogo Diogo C Lopes Carlos B da Silva

Lagrangian statistics from millions of particles are used to study the turbulent entrainment mechanism in a direct numerical simulation of a turbulent plane jet at Re(λ) ≈ 110. The particles (tracers) are initially seeded at the irrotational region of the jet near the turbulent shear layer and are followed as they are drawn into the turbulent region across the turbulent-nonturbulent interface (...

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2008
Daniela Tordella Michele Iovieno Peter Roger Bailey

The interaction of two isotropic turbulent fields of equal integral scale but different kinetic energy generates the simplest kind of inhomogeneous turbulent field. In this paper we present a numerical experiment where two time decaying isotropic fields of kinetic energies E1 and E2 initially match over a narrow region. Within this region the kinetic energy varies as a hyperbolic tangent. The f...

Journal: :American Journal of Roentgenology 1966

Journal: :JOURNAL OF THE JAPAN WELDING SOCIETY 2009

This paper examines whether the gold coin futures prices in the Iran Mercantile Exchange can forecast accurately the gold coin spot prices at the maturity date. For this, it uses daily data of both futures and spot prices from Azar 1387 to Tir 1397. A cointegration analysis shows that in horizons shorter than 100 days, there is a significant one-to-one relation between these two prices which im...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2015
tahereh asadi mohsen nasr esfahany

this paper presents a numerical study of local mass transfer coefficients in a 90° bend using the rng version of k–e model to include the influence of curvature on the turbulent transport. simulations were performed for flow through a 90°, 3-d bend for reynolds numbers of 13500, 90000, and 390000, schmidt numbers of 2.53 and 700 and curvature ratios of 1.5, 2, and 2.5. the differences between t...

Journal: :حفاظت گیاهان 0
جعفرپور جعفرپور سبک خیز سبک خیز فلاحتی رستگار فلاحتی رستگار

abstract iris yellow spot virus (iysv) is one of the important pathogens of onion in reported countries. host range of this virus is very wide and transmitted by onion thrips (thrips tabaci). in survey that was conducted in summer 2006 in onion fields of mashhad, samples with viral symptoms and high population of thrips have been collected. since the symptoms were similar to iysv, special antis...

Journal: :journal of crop protection 2015
seyed yusef behrooz mohamad salari mahdi pirnia seyed kazem sabbagh

cercosporoid fungi including the genus cercospora and other morphologically similar genera are associated with leaf spot symptoms on various host plants. in this research three taxa including passalora cucurbiticola (on cucurbita sp.), p. bolleana (on ficus carica), and pseudocercosporella capsellae (on capsella bursa-pastoris, sinapis arvensis) were identified. among these, p. cucurbiticola an...

Journal: :iranian journal of medical physics 0
mohammad hossein miran beygi faculty of electrical and computer engineering, tarbiat modares university, tehran, iran bahareh azarian protein-chemistry laboratory, biotechnology research center, pasteur institute of iran, tehran, iran ali gooya faculty of electrical and computer engineering, tarbiat modares university, tehran, iran

introduction two-dimensional gel electrophoresis (2dge) is a powerful technique in proteomics for protein separation. in this technique, spot segmentation is an essential stage, which can be challenging due to problems such as overlapping spots, streaks, artifacts and noise. watershed transform is one of the common methods for image segmentation. nevertheless, in 2dge image segmentation, the no...

Journal: :Optical and Quantum Electronics 2021

In this paper, the effects of turbulent biological tissues (TBT) on propagation properties coherent Laguerre-Gaussian (CLG) beams are studied. Based turbulence theory and using power spectrum refractive-index model, expression formulae average irradiance intensity spreading a CLG beam propagating in TBT derived. The influence distance, orders, wavelengths tissue parameters then investigated num...

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