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Temperature-dependent evolution of oxide inclusions during heat treatment of stainless steel with yttrium addition

International Journal of Minerals,Metallurgy and Materials 2020年第6期27卷 754-763页

作者： Xue-liang Zhang Shu-feng Yang Jing-she Li Jin-qiang Wu School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China Department of Material Science and Engineering Missouri University of Science and TechnologyRollaMO 65409USA Center for Innovation through Visualization and Simulation Purdue University NorthwestHammondIN 46323USA

The evolution of oxide inclusions during isothermal heating of 18Cr–8Ni stainless steel with yttrium addition at temperatures of 1273 to 1573 K was investigated *** spherical Al–Y–Si(–Mn–Cr)oxide inclusions were observed in as-cast *** heating,most of the homogeneous inclusions were transformed into heterogeneous inclusions with Y-rich and Al-rich parts,even though some homogeneous oxide particles were still observed at 1273 and 1573 *** the increase in heating temperature,more large-sized inclusions were *** shape of the inclusions also changed from spherical to *** maximum transformation temperature of inclusions was determined to be 1373 *** evolution mechanism of inclusions during heating was proposed to be the combined effect of the(i)internal transformation of inclusions due to the crystallization of glassy oxide and(ii)interfacial reaction between inclusions and steel ***,the internal transformation of inclusions was considered to be the main factor at heating temperatures less than 1473 K.

关键词： stainless steel rare earth metals oxide inclusions heating temperature

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Visual Analysis for Wildlife Preserve based on Muti-systems

Visual Analysis for Wildlife Preserve based on Muti-systems

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2017 IEEE Conference on Visual Analytics Science and Technology, VAST 2017

作者： Lin, Lijing Lu, Min Li, Guozheng Lai, Chufan Jiang, Ruike Liu, Qiangqiang Yuan, Xiaoru Key Laboratory of Machine Perception Ministry of Education School of EECS Peking University China Beijing Engineering Technology Research Center of Virtual Simulation and Visualization Peking University China

ISBN: (纸本)9781538631638

In the Grand Challenge of IEEE VAST Challenge 2017, we explore the systems in each mini-challenge, and combine the discoveries logically to provide a comprehensive story happened in the wildlife preserve. In this report, we present technical details for the systems, in order to discuss how to discover the events, and how to combine them to construct an overall picture considering the additional information, newsletter, in the Grand Challenge. © 2017 IEEE.

关键词： Trajectory Production facilities Chemicals Visual analytics Chemical sensors Sensors

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Real-time rendering of large-scale static scene

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Computer Aided Drafting,Design and Manufacturing 2017年第2期27卷 1-6页

作者： Wang Shaohua Li Sheng Lai Shunnan Beijing Engineering Technology Research Center of Virtual Simulation and Visualization Peking University School of Electronics Engineering and Computer Science Peking University

In virtual simulation application, it is often necessary to use Open GL to render large-scale 3D static scenes including urban architectures. Each scene unit generally has individual vertex data and texture. For large-scale data set, it is hard to render all scene units simultaneously. We need to render part of the scene separately, which is called the scene partition and culling. In general, we partition the whole scene into different units on the CPU. We present a scheme that optimize the GPU rendering pipeline to cull the large-scale static scene, which will reduce the CPU suspending time and take full advantage of GPU computing advantages to speed up the rendering efficiency.

关键词： large-scale GPU culling real-time

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Editing Vector Graphics in the virtual simulation Environment

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Computer Aided Drafting,Design and Manufacturing 2014年第2期24卷 23-29页

作者： SHI Xiao-long LAI Shun-nan Shenzhen Graduate School Beijing Engineering Technology Research Center of Virtual Simulation and Visualization School of Electronics Engineering and Computer Science Peking University

We present a method to represent multi-resolution vector graphics such as road networks or railway networks in virtual environment. These vector data can be interactively edited and the landscape and be explored in real time at any altitude from flight view to car view. We design a context-focused vector description of linear can areal features, with associated customized definition painter to specify their appearance （color and material） and their display mode （detailed mode or simplified mode）. There are some special problems in drawing vector graphics in virtual environment. Floating-point round-off error appear when we use a low view point to observe the scene, and it leads to scene jittering. Drawing 3D wide lines turns into a problem on 3D terrain. We design a view-based self-adaptive interpolation algorithm and an offset line generating algorithm to solve it. Our results show high performance with good visual quality.

关键词： vector graphics virtual reality virtual globe

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Robust and accurate calibration point extraction with multi-scale chess-board feature detector

Communications in Computer and Information Science

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Communications in Computer and Information Science 2014年 437卷 153-164页

作者： Liu, Yang Chen, Yisong Wang, Guoping Shenzhen Graduate School Peking University Beijiing Engineering Technology Research Center of Virtual Simulation and Visualization China Graphics Lab of EECS Peking University Beijiing Engineering Technology Research Center of Virtual Simulation and Visualization China

ISBN: (纸本)9783662454978

Chess-board grid has been widely used for camera calibration and the associated feature point extraction algorithm draws much attention. In this paper, a multi-scale chess-board feature point detector is proposed, along with a chess-board matching algorithm for a specific marker used in our 3D reconstruction system. Experiments show that our method is more robust and accurate compared to commonly used approaches. © Springer-Verlag Berlin Heidelberg 2014.

关键词： Calibration

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Range Guided Depth Refinement and Uncertainty-Aware Aggregation for View Synthesis

Range Guided Depth Refinement and Uncertainty-Aware Aggregat...

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IEEE International Conference on Acoustics, Speech and Signal Processing

作者： Yuan Chang Yisong Chen Guoping Wang School of Electronics Engineering and Computer Science Peking University Beijing Engineering Research Center for Virtual Simulation and Visualization

In this paper, we present a framework of view synthesis, including range guided depth refinement and uncertainty-aware aggregation based novel view synthesis. We first propose a novel depth refinement method to improve the quality and robustness of the depth map reconstruction. To that end, we use a range prior to constrain the estimated depth, which helps us to get more accurate depth information. Then we propose an uncertainty-aware aggregation method for novel view synthesis. We compute the uncertainty of the estimated depth for each pixel, and reduce the influence of pixels whose uncertainty are large when synthesizing novel views. This step helps to reduce some artifacts such as ghost and blur. We validate the performance of our algorithm experimentally, and we show that our approach achieves state-of-the-art performance.

关键词： Uncertainty Conferences Aggregates Signal processing algorithms Signal processing Rendering (computer graphics) Robustness

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Real-Time Rendering of Large-Scale Ocean Environments

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Computer Aided Drafting,Design and Manufacturing 2015年第2期25卷 47-53页

作者： HUANG Jing-jia LI Sheng LAI Shun-nan WANG Guo-ping Peking University Shenzhen Graduate School Beijing Engineering Technology Research Center of Virtual Simulation and Visualization Peking University Beida (Binhai) Information Research

simulation and rendering of large-scale natural environments, especially the ocean, has always been one of the hot issues in computer graphics, which can provide realism for various applications such as computer game, movie and military usage. simulation of ocean environment is often lack of realism for real-time application due to its complexity of dynamic waves. In this paper, a method based on FFT Wave model is proposed to solve this problem, which can also simulate the ocean optic property with atmosphere scattering. Furthermore, our method has a lot of advantages including global ocean dataset support, real-time, dynamic reflection of ocean, the foam on the wave, smooth transition from deep ocean to seacoast, etc. The experimental results demonstrate the realism and effectiveness of our approach.

关键词： FFT wave model real-time rendering reflection refraction foam

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An improved vertex-clustering-based progressive mesh encoder

An improved vertex-clustering-based progressive mesh encoder

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IEEE International Conference on Multimedia and Expo (ICME)

作者： Guoping Wang Yongzhen Wu Guojing Hu Jingliang Peng Beijing Engineering Research Center of Virtual Simulation and Visualization (Peking University) School of Computer Science and Technology Shandong University

In this work, we propose improvements on a state-of-the-art scheme for progressive triangular mesh compression, which is based on hierarchical vertex clustering. Specifically, we fix several shortcomings of that scheme including quantization error accumulation, false facet generation and lack of facet orientation encoding. In addition, the resultant mesh encoder yields better rate-distortion performance than another state-of-the-art one on our test model, as demonstrated by the experiments.

关键词： Encoding Geometry Three-dimensional displays Rate-distortion Solid modeling visualization Intellectual property

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Optimization of multi-cluster fracturing model under the action of induced stress in horizontal wells

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Journal of engineering Science and Technology Review 2016年第2期9卷 59-65页

作者： Liu, Shanyong Lou, Yishan Wu, Han Teng, Keyan Chen, Di Yao, Auer School of Petroleum Engineering Yangtze University Wuhan430100 China Nuclear and Radiation Safety Center Beijing100082 China School of Energy Resources China University of Geosciences Beijing100083 China I-Virtual Simulation Systems Inc. Vancover Canada

Volume fracturing in shale gas forms complex fracture networks and increases stimulated reservoir volume through large-scale fracturing operation with plug-perforation technology. However, some perforation clusters are stimulated unevenly after fracturing. This study aims to solve this problem by analyzing the shortcomings of the conventional fracturing model and developing a coupled model based on the 2D fracture motion equation, energy conservation law, linear elastic mechanics, and stress superposition principle. First, a multi-fracture in-situ stress model was built by studying the induced stress produced by the fracture initiation to deduce the multi-fracture induced stress impact factor on the basis of the stress superposition principle. Then, the classical Perkins-Kern-Nordgren model was utilized with the crustal stress model. Finally, a precise fracturing design method was used to optimize perforation and fracturing parameters under the new model. Results demonstrate that the interference effect among fractures is the major factor causing the non-uniform propagation of each fracture. Compression on the main horizontal stress increases the net pressure. Therefore, both the degree of operation difficulty and the complexity of fracture geometry are improved. After applying the optimal design, the production is increased by 20%, and the cost is reduced by 15%. © 2016 Eastern Macedonia and Thrace Institute of Technology.

关键词： Fracture

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COMPRESSING MATERIAL AND TEXTURE ATTRIBUTES FOR TRIANGULAR MESHES

COMPRESSING MATERIAL AND TEXTURE ATTRIBUTES FOR TRIANGULAR M...

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IEEE International Conference on Multimedia and Expo

ISBN: (纸本)9781479947607

A novel scheme for single-rate compression of material and texture attributes for triangular meshes is proposed in this work. For the material coding, it proposes a novel approach based on breadth-first surface traversal, exploiting the local coherence of the material attributes among neighboring facets;for the texture coordinate coding, it proposes a similar-triangle-based prediction method, exploiting the correlation between 3D geometry and its texture-space parameterization. As a result, the proposed algorithm achieves efficient coding of the material and the texture attributes, as experimentally demonstrated.

关键词： Compression Material Texture Mesh

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