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A NOVEL 3-d model FOR THE WATER CRESTING IN HORIZONTAL WELLS

Journal of Hydrodynamics 2008年第6期20卷 749-755页

作者： LUO Wan-jing ZHOU Ying-fang WANG Xiao-dong School of Energy Resources China University of Geosciences Beijing 100083 China

In the presence of bottom water, a drop in the reservoir pressure due to fluid production causes the aquifer water to expand and to flow into the reservoir. Therefore, hydrocarbon production from a well is limited by the critical flow rate. The main purpose of this study is to investigate the breakthrough time and the critical rate by using a novel 3-d horizontal well model. Based on the hypothesis that the horizontal well is located in any position of a circular reservoir with no-flow boundary on the top of the reservoir and constant pressure boundary at the bottom, the horizontal well has been regarded as an infinite conductivity line sink and then a 3-d steady-state flow model of the horizontal well is set up. A point sink pressure solution can be obtained with the Fourier transform. The result of the pressure distribution of the uniform flux horizontal well can be presented by means of the principle of superposition. According to the stable water cresting theory, this study confirms the stable height of water cresting and the critical rate. Meanwhile, it can re-confirm the breakthrough time at a specific rate. The output of a comparison between this 3-d model and the reservoir numerical simulator （Eclipse） shows the method presented here can be applied to investigate the behavior of a water cresting and to predict the breakthrough time at the bottom water driver reservoir.

关键词： horizontal well bottom reservoir critical rate breakthrough time 3-d model

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Research on Human Motion Capture Technology of depth Map and 3d model Based on Hybrid Reality

Research on Human Motion Capture Technology of Depth Map and...

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作者： Chen Xiaoman Xiamen Huaxia University

Human motion capture is an important research direction in the field of computer vision. It aims to analyze images or videos to obtain human posture and motion parameters, and to further carry out posture recognition, semantic analysis and behavior understanding. Human motion capture refers to extracting the region containing useful information from the background image from the image sequence to make it a meaningful entity. Three-dimensional human motion capture data is increasingly used in animation, film production, games and other industries due to its strong visual reality and expressive force. Both professional animators and non professionals are inseparable from the browsing, searching and accumulation of materials. Therefore, the retrieval and reuse of large-scale motion capture data need to be supported by efficient, accurate and reliable retrieval methods. Based on the hybrid reality technology, this paper studies the human motion capture technology which combines depth map and 3d model.

关键词： Motion capture 3-d model Motion parameters data

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NUMERICAL STUdY ON THE THREE-dIMENSIONAL CHARA-CTERISTICS OF THE TIdAL CURRENT AROUNd HARBOR ENTRANCE

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Journal of Hydrodynamics 2010年第6期22卷 847-855页

作者： XIE Ming-xiao ZHANG Wei Key Laboratory of Engineering Sediment of Ministry of Transport Tianjin Research Institute for Water TransportEngineering M.O.T. Tianjin 300456 China College of Harbor Coastal and Offshore Engineering Hohai University Nanjing 210098 China

A three-dimensional （3-d） numerical model is established to investigate the tidal current motion characteristics around the harbor entrance. Computational approaches consist of the finite difference method, time-splitting technique, C-grid, and a high-order turbulence closure model. The Ocean General Circulation model （OGCM） inundation scheme is incorporated in the model. An engineering application, Lianyungang Harbor, China, is used as a real-life case. The model is validated by showing that the simulated results agree well with the field data. In the approach channel, the tidal current shows a deflection effect especially in the bottom layer. As for Lianyungang Harbor, a jet flow forms at the tip of the northern breakwater, which drives a circulation flow at the inner side of the harbor entrance. In the vertical, the flow is significantly stratified at the entrance section within the channel, where the flow direction varies between layers and the speed distribution is quite uniform. These 3-d features become less evident to the offshore. Additionally, the sensitivity analysis shows that the flow deflection is related to the channel depth. Simulation results also imply that the siltation rate at the entrance section of the approach channel tends to be more uniform by the 3-d flow motion feature, and could be more significant with the increase of the channel depth.

关键词： 3-d model harbor entrance OGCM inundation scheme stratification features

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Toxicity testing of four silver nanoparticle-coated dental castings in 3-d LO2 cell cultures

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2018年第2期19卷 159-167页

作者： Yi-ying ZHAO Qiang CHU Xu-er SHI Xiao-dong ZHENG Xiao-ting SHEN Yan-zhen ZHANG department of Food Science and Nutrition Zhejiang Key Laboratory for Agro-Food ProcessingFuli Institute of Food Science Huajiachi dental Center Stomatology Hospital Affiliated to Zhejiang University of Medicine department of General dentistry the Second Affiliated Hospital School of Medicine Zhejiang University

To address the controversial issue of the toxicity of dental alloys and silver nanoparticles in medical ap- plications, an in vivo-like LO2 3-d model was constructed within polyvinylidene fluoride hollow fiber materials to mimic the microenvironment of liver tissue. The use of microscopy methods and the measurement of liver-specific functions optimized the model for best cell performances and also proved the superiority of the 3-d LO2 model when compared with the traditional monolayer model. Toxicity tests were conducted using the newly constructed model, finding that four dental castings coated with silver nanoparticles were toxic to human hepatocytes after cell viability assays. In general, the toxicity of both the castings and the coated silver nanoparticles aggravated as time increased, yet the nanoparticles attenuated the general toxicity by preventing metal ion release, especially at high concentrations.

关键词： LO2 cell 3-d model Silver nanoparticles dental alloys Toxicity test

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