Filter is one of the main components of embankment dams. By a simple but effective performance, filter protects the dam against erosion and soil scouring in impervious core caused by leakage (piping) and makes it safe. Interaction between filter and erodible base soil is a complex phenomenon which is dependent upon several factors, and has challenged researchers for better understanding the fil...

conclusion both techniques provided quantitatively consistent results of in vivo velocity vector fields in right internal carotid artery (rca). pc mri represented a good estimation of main flow patterns inside the vasculature, which seems to be acceptable for clinical use. however, limitations of each technique should be considered while interpreting results. subjects and methods mr imaging was...

The medical CT images are irregular and have deep boundary concavities. So how to get the organ picture from serial images quickly and accurately is a difficult process. The paper discusses the shortcoming of GVF model being susceptible to structures with slender topology. For the better convergence we improve GVF model by setting the initial contour as the actual contour. The new algorithm com...

In this paper we examine the effect of mild stenosis on blood flow, in an irregular axisymmetric artery with oscillating pressure gradient. The Herschel-Bulkley fluid model has been utilized for this study. The combined influence of an asymmetric shape and surface irregularities of constriction has been explored in this computational study. An extensive quantitative analysis has been performed ...

The axial flow screw-type oil-gas multiphase pump is mainly applied to oil and gas transport in the deep sea. In process of transporting medium, volume fraction (GVF) on phase changes from time-to-time, resulting performance being greatly influenced by phase. This paper presents a detailed analysis gas-phase distribution law vortex passages within means numerical calculations, supplemented expe...

We present a novel spatiotemporal saliency detection method to estimate salient regions in videos based on the gradient flow field and energy optimization. The proposed gradient flow field incorporates two distinctive features: 1) intra-frame boundary information and 2) inter-frame motion information together for indicating the salient regions. Based on the effective utilization of both intra-f...

Article history: Received 9 March 2012 Available online 4 October 2012 Communicated by G. Borgefors

in this study, a three–layer artificial neural network (ann) model was developed to predict the pressure gradient in horizontal liquid–liquid separated flow. a total of 455 data points were collected from 13 data sources to develop the ann model. superficial velocities, viscosity ratio and density ratio of oil to water, and roughness and inner diameter of pipe were used as input parameters of t...

In this paper, the gradient vector flow fields are introduced in the image anisotropic diffusion, and the shock filter, mean curvature flow and Perona-Malik equation are reformulated respectively in the context of this flow fields. Many advantages over the original models can be obtained, such as numerical stability, a large capture range, and computational simplification etc. In addition, the ...

The paper studies the problem of nonlinear feedback control design of non-isothermal Continuously Stirred Tank Reactors (CSTR). The objective is to construct a feedback controller such that a desired equilibrium of the closed-loop dynamic is asymptotically stable and such that the closed-loop vector field is a conservative vector field of a particular type, i.e., a gradient system. Properties o...