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Influence of edge effects on the molding filling in liquid composites molding

Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of technology 2005年第4期27卷 16-18+22页

作者： Tian, Zheng-Gang Wang, Ji-Hui Zhang, Yuan Gao, Guo-Qiang Zhu, Ying-Dan State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan Univ. of Technology Wuhan 430070 China Beijing FRP Research and Design Inst. Beijing 102101 China

In liquid composites molding (LCM) processes,a gap between the perform and the mold edge can create a preferential flow path for the resin, which is the so-called edge effect. The resin flow behaviors in different gaps were studied by the unidirectional flow method together with the equivalent permeability tensor of flow path computed by two geometric models. In addition, the filling process was simulated to predict the influences of edge effects on the flow pattern. It is found out that even small gaps would disturb the edge flow. The simulation shows good agreement with the experiments.

关键词： Edge effect Equivalent permeability LCM

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Relationship between saturated water vapour pressure and characteristics of porous medium in PEMFC

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Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of technology (Transportation Science and Engineering) 2005年第5期29卷 727-730页

作者： Zhan, Zhigang Xiao, Jinsheng Luo, Zhiping Pan, Mu Yuan, Runzhang School of Energy and Power Engineering WUT Wuhan 430063 China State Key Laboratory of Advanced Technology for Materials Synthesis WUT Wuhan 430070 China

Water management of PEMFC is a key factor for its successful operation. Based on the microstructure model of the catalyst layer, the transfer manner of the water produced in the electrochemical reaction is analysed. According to the hydrophilic and the hydrophobic characteristics of the porous medium of the catalyst layer, sub-diffusion layer and the diffusion layer, the effect of the diameter of the pore in the porous medium on the saturation water vapour pressure is calculated, and hence conclusion is made that the produced water by the electrochemical reaction can be either vapour or liquid, depending upon the environment where it exists. Hydrophilicity, hydrophobicity and the diameter of the pore in the porous medium have great effect on the saturation water vapour pressure;when water phase change and two-phase flow is studied in pore level, the factors mentioned above must be considered.

关键词： PEMFC Phase change saturation water vapour Porous medium

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A flow-based network monitoring system used for CSCW in design

A flow-based network monitoring system used for CSCW in desi...

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International Conference on Computer Supported Cooperative Work in Design

作者： Bo Yang Yi Li Yuehui Chen Runzhang Yuan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Science and Engineering China School of Information Science and Technology Jinan University China

ISBN: (纸本)184000025

technology trends in today's cooperative design environments are making it more and more important to monitor the network performance and ensure the network security. This paper describes the design and implementation of a distributed network traffic monitoring system based on embedded NetFlow hardware and software engines. The system architecture and design principles were introduced in the paper, some discussions were also presented about the NetFlow-based network monitoring technologies. The system had been successfully used to monitor highspeed campus networks at full wire speed without packet sampling in scenarios where commercial NetFlow collectors could not be used due to their limitations. Results show that this is an effective mechanism to identify, diagnose, and determine controls for network activities in CSCW environments and other network-based applications.

关键词： Monitoring Intelligent networks Telecommunication traffic Switches materials science and technology Sampling methods Probes Protocols Network synthesis Information science

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Influence of sintering on quality factor of Ba(Mg/13Nb/23)O3 ceramic

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Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of technology 2005年第6期27卷 5-7+14页

作者： Tian, Zhong-Qing Liu, Han-Xing Wang, Hao Yu, Hong-Tao School of Materials Science and Engineering Chongqing Institute of Technology Chongqing 400050 China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China

The influences of sintering temperature, soaking time and annealing time on the quality factor of Ba(Mg/13Nb2/3)O3 microwave dielectric ceramic were investigated. The result showed that Qf value increased as the sintering temperature increasing. It was ascribed to the increasing of the relative density and ordering parameter S. The maximum value of Qf, 49500 GHz, was gained at 1550°C. With soaking time increasing, Qf value increased. The increasing of B-site 1:2 ordering degree and grain size should be responsible for the improvement of Qf value. When soaking time was 16 h, Qf value reached 58000 GHz. Annealing time had great effect on Qf value. With annealing time increasing, Qf value increased quickly. This was because of the improvement of B-site 1:2 ordering caused by annealing. A high Qf value, 71500 GHz, was acquired when annealing time was 48 h.

关键词： Ba(Mg/13Nb/23)O3 Microwave dielectric ceramic Quality factor

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Recent development in nano and graded thermoelectric materials

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8th International Symposium on Multifunctional and Functionally Graded materials, FGM2004

作者： Zhang, Qing-Jie Tang, Xin-Feng Zhai, Peng-Cheng Niino, Masayuki Endo, Cyoji State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Wuhan 430070 China Japan Aerospace Exploration Agency 1 Kimigaya-Koganezawa Kakuda Miyagi 981-1525 Japan Foundation for Promotion of Japanese Aerospace Technology 1-16-6 Izumi Chou Sendai Miyagi 981-3133 Japan

ISBN: (纸本)0878499709

In 2003, a joint research project entitled "Nano and graded thermoelectric materials/Photovoltaic-thermoelectric-wind power generation" is established in cooperation among research institutes from Japan and China. The major research institutes include state key laboratory of advanced technology for materials synthesis and processing (Wuhan University of technology, China), Shanghai Institute of Ceramics (Chinese Academy of Sciences, China), state key laboratory of New Ceramics and Fine processing (Tsinghua University, China), Japan Aerospace Exploration Agency (JAXA, Japan) and Foundation for Promotion of Japanese Aerospace technology (JAST, Japan). The main aim of this project is to develop a photovoltaic-thermoelectric-wind power generation system with high efficiency solar energy conversion. The key works of the project include: (1) fabrication of high efficiency nano thermoelectric materials with a maximum figure of merit Z≥ 1.3;(2) design and fabrication of nano graded thermoelectric material/component with efficiency conversion larger than 12% for wide temperature range and (3) design and construction of photovoltaic- thermoelectric coupled power generation system. The recent progress about the joint research project is reported in this paper. Emphasis is put on the mechanism, design and fabrication of high efficiency nano graded thermoelectric materials. The future research plan is also mentioned in brief.

关键词： Nanostructured materials

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Effect of Sm2O3 on the densification and thermal conductivity of spark plasma sintered AIN ceramics

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Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal materials and Engineering 2005年第SUPPL. 1 PART 2期34卷 821-822页

作者： Li, Meijuan Zhang, Lianmeng Li, Tao Shen, Qiang Yu, Mingqing Wuhan University of Technology Wuhan 430070 China Research Institute of Synthetic Crystals Beijing 100083 China State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Aluminum nitride (AlN) ceramic is difficult to sinter through conventional sintering processes. Spark plasma sintering (SPS) was used to sinter it in this study. A pulsed direct current was applied to the AlN powder in SPS. It engendered concentrated heating in the sinter, and then accelerated the diffusion and contact of AlN particle surfaces. With sintering additive Sm 2O3, the AlN powder was sintered into near-theoretical density in a considerably shorter time cycle compared with conventional sintering processes. The effects of quantity of additive Sm2O 3 and sintering temperature on densification of AlN samples were investigated. Results indicated that the addition of Sm2O3 enhanced the densification of AlN ceramic and lowered the sintering temperature. The AlN ceramics prepared by SPS method had homogeneous crystals. The crystals grains grew well. The Sm-Al-O compounds were created in grain boundary by reaction between Sm2O3 and Al 2O3 on AlN particle surface during the sintering. The reaction effectively accelerated the diffusion among the AlN grains, speeded the densifications of the sinter. And it was favorable to preserve the integrity of the AlN crystal lattice. As a result, the AlN sinter obtained a good thermal conductivity, which was as high as 150W/(m·K).

关键词： AlN ceramic Sm2O3 Spark plasma sintering (SPS) Thermal conductivity

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Hydrothermal synthesis, crystal structure and characterization of the complex [Cu(C12H8N2) · (H2O)2]SO4

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Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of technology 2005年第4期27卷 1-4页

作者： Jin, Su-Rong Zhang, Lian-Meng Zhao, Wei-Feng Hu, Xue-Lei State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan Univ. of Technology Wuhan 430070 China Sch. of Chemical Engineering and Pharmaceutics Wuhan Inst. of Chemical Technology Wuhan 430074 China

The title complex [Cu(C12H8N2) · (H2O)2]SO4 was synthesized by hydrothermal method and characterized by elemental analysis, IR and X-ray single crystal structural analysis. The crystal structure indicates that the compound forms a stratiform, built from the SO42- and [Cu(C12H8N2) · (H2O)2]2+ through hydrogen bonds. The chemical formula weight of complex is 375.84. The crystal structure is monoclinic, pace group C2/c with a = 1.485 3(3) nm, b = 1.381 1(3) nm, c = 0.701 0(14) nm, β = 108.650°, V= 1.362 5(15) nm3, Dc = 1.832 g/cm3 ,F(000) = 764, Z = 4,R1 = 0.0290, wR2 = 0.0862. The result of the single crystal X-ray diffraction analysis is in agreement with that of IR measurement, both of them show that the Cu2+ is coordinated by two nitrogen and two oxygen. In addition, the thermostability and IR spectral of the compound were discussed.

关键词： Copper complex Crystal structure Hydrothermal synthesis

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Transient thermochemical analysis of liquefied petroleum gas vessel under pool fire surrounding

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Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of technology (Transportation Science and Engineering) 2005年第2期29卷 190-193页

作者： Yin, Qizhi Xiao, Jinsheng Zhao, Zaili Yang, Bo Sch. of Energy and Power Engineering Wuhan Univ. of Technol. Wuhan 430063 China State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan Univ. of Technol. Wuhan 430072 China

The transient temperature field analysis aims at the thermal response of LPG vessel under pool fire surrounding environment. The finite element analysis method is used to calculate the temperature field. The thermal boundary conditions of LPG vessel are determined according to heat transfer theory and calculated by the software PLGS99. The results show that the maximum temperature gradient of vessel appears near the highest surface where the liquid can reach, and fluctuation of liquid surface is the main reason of high temperature gradient.

关键词： Finite element analysis Liquefied petroleum gas Pressure vessel Temperature field

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Performance of hydrogen storage of carbon nanotubes decorated with palladium

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中国有色金属学会会刊：英文版 2004年第5期14卷 996-999页

作者：木士春唐浩林钱胜浩潘牧袁润章 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Carbon nanotubes（CNTs） decorated with palladium were synthesized and applied to hydrogen storage of gas phase. The results show that the amount of hydrogen storage of the decorated CNTs is up to 3.9%（mass fraction）, of which, almost 85% H2 can be desorbed at ambient temperature and pressure, while the non-decorated CNTs has a poor performance of hydrogen storage（only about 0.5%H2, mass fraction）. These indicate that it is feasible to enhance the performance of hydrogen storage of CNTs by further decoration with hydrogen-storing metals or alloys.

关键词：钯 CNTs 储氢合金碳 pb 储氢性能

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synthesis, Crystal Structures and Characterization of Ba5LiTiNb9O30

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Chinese Journal of Chemistry 2004年第5期22卷 434-436+406页

作者：刘韩星邹龙周建方亮张高科欧阳世翕 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Tech-nology Hubei 430070 China

A new niobate compound with the chemical composition of Ba5LiTiNb9O30 was synthesized by doping Li+ into the system BaO-TiO2-Nb2O5 in conventional solid state reaction method. The crystalline structure was determined by X-ray diffraction analysis (XRD). The results showed that crystal structure of Ba5LiTiNb9O30 belongs to tetrago-nal tungsten bronze structure with space group P4bm and its unit cell parameters: a=b=1.2512(2) nm, c=0.4008(5) nm. The microstructure of reaction products was observed by scanning electron microscopy (SEM).

关键词： niobate tungsten bronze structure XRD solid state reaction SEM

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