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Sandwich Magnetoelectric Composites of Polyvinylidene Fluoride,Tb-Dy-Fe Alloy,and Lead Zireonate Titanate

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Journal of wuhan university of technology(Materials science) 2007年第4期22卷 596-599页

作者：赵广辉熊传溪 State Key Laboratory of Advanced technology for Materials Synthesis and Processing school of Computer science and technology Wuhan University of TechnologyWuhan 430070China school of Materials science and Engineering Wuhan University of TechnologyWuhan 430070China

The novel sandwich composites were prepared by sandwiching a polyvinylidene fluoride/Tb- Dy-Fe alloy composite （PVDF/Terfenol-D） between polyvinylidene fluoride/lead zirconate titanate composites （PVDF/PZT）. The maximum magnetoelectric effect voltage coefficient, （dE/dn）33max, of the sandwich composites is higher than that of three-phase composites at their own optimal loading level of Terfenol-D. This is attributed to less interface relaxations of strain and better polarization of the sandwich composites. When the volume fraction of Terfenol-D is higher than 0.10, no coupling interaction for three-phase composites could be observed, but （dE/dn）33max of sandwiched composites still reached 20 mV/（***）. At high magnetic field intensity, the magnetoelectric effect voltage coefficient, （dE/dn）33, of sandwich composites is higher than that of three-phase composites; at low magnetic field intensity, （dE/dn）33 of sandwich composites is lower than that of three-phase composites. At their resonance frequency, the （dE/dn）33max of the sandwich composites and the three phase composites are 150 mV/（***） and 42 mV/（cmoOe）, respectively. This significant increase of （dE/ dn）33max at resonance frequency confirms the improvement of maximum magnetoelectric effect coefficient via sandwich-structured composites.

关键词： magnetoelectric piezoelectric sandwiched composites

Electrically Conductive Concrete for Heating Using Steel Bars as Electrodes

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Journal of wuhan university of technology(Materials science) 2010年第3期25卷 523-526页

作者：侯作富 school of Mechanical Engineering Yangtze University

The steel bars with good electrical conductivity were used as two kinds of electrodes in the making of carbon fiber（CF） electrically conductive concrete for *** results of the pertinent experiments illustrate the design is *** change in electrical resistivity over three years＇ hydration time was studied when steel bars were used as lateral face electrodes and top bottom surface electrodes *** temperature rise test was conducted to verify the heating properties of two kinds of *** only the study can reduce the CF volume content of electrically conductive concrete for heating to 0.58% or 0.36% according to different design,but also it will enhance the carrying capacity of the concrete roadway for heating.

关键词： steel bar carbon fiber electrical resistivity temperature rise

The Crack of Harden Cement Paste Observed with Multi-technique

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Journal of wuhan university of technology(Materials science) 2010年第6期25卷 1057-1060页

作者：沈卫国 Key Laboratory for Silicate Materials science and Engineering of Ministry of Education Wuhan University of Techoology school of Materials science and Engineering Wuhan University of Technology

The shrinkage of the cement paste with low water-cement ratio at different relative humidity was observed and analyzed with ESEM and deformation map *** crack morphology was observed with different magnification with SEM and FESEM,and the formation of the crack was observed with AFM between two C-S-H nano *** observation by multi technique at multi scale indicated that the shrinkage was increase with the decrease of the humidity due to the increase of the pressure of the capillary pressure,the morphology of the crack in smaller scale was similar to that in the bigger scale,the smaller crack distributed in the latticework of the bigger ones,and the crack propagated along the gap between two nano particles of C-S-H with weaker bonding.

关键词： crack cement paste shrinkage muli technique multi-scale

Kinetics of the Thermal Decomposition of Wangjiatan Siderite

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Journal of wuhan university of technology(Materials science) 2011年第3期26卷 523-526页

作者：冯志力 Huazhong university of science and technology

The thermal decomposition processes of Wangjiatan siderite samples were studied in nitrogen by thermogravimetric（TG）*** mechanism of thermal decomposition of the siderite obeyed an F n kinetic law and the n-order was between 1.16 and *** results from non-isothermal experiments show that the size of particles has an obvious effect on the logarithm of pre-exponential factor in kinetics parameter of the thermal decomposition of Wangjiatan siderite.A linear relationship is shown between the size of particles and the logarithm of pre-exponential *** F 1 kinetic model containing size factor describes the thermal decomposition of Wangjiatan siderite well.

关键词： thermal decomposition mechanism kinetics siderite

Effects of Substrate Local Strain on Microstructure of Electrodeposited Aluminum Film

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Journal of wuhan university of technology(Materials science) 2006年第3期21卷 69-71页

作者：谭月华 College of Chemistry and Chemical Engineering Xinjiang UinversityUrumqi 830046China

The aluminum coating layer was formed on a copper substrate with lacal strain region by using the electrodeposited method. It was found that the particle shape of the coating deposited on the copper substrate is very sensitive to the strain extent of substrate. The large needle-like aluminum particles were observed on the substrate region with large local strain, indicating that substrate local strain may affect the shape of the deposited particles and promote the nucleation and growth of the deposited particles.

关键词： electrodeposition strain energy particle shade

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车辆路径问题的粒子群算法研究

系统工程学报 2004年第6期19卷 596-600页

作者：李宁邹彤孙德宝华中科技大学控制科学与工程系

车辆路径优化问题是一类具有重要实用价值的组合NP问题.粒子群算法(particleswarmoptimization)是一种新出现的群智能(swarmintelligence)优化方法,将其应用于车辆路径优化问题,构造车辆路径问题的粒子表达方法,建立了此问题的粒子群算... 详细信息

车辆路径优化问题是一类具有重要实用价值的组合NP问题.粒子群算法(particleswarmoptimization)是一种新出现的群智能(swarmintelligence)优化方法,将其应用于车辆路径优化问题,构造车辆路径问题的粒子表达方法,建立了此问题的粒子群算法,并与遗传算法作了对比试验.结果表明,粒子群算法可以快速、有效求得车辆路径问题的优化解,是求解车辆路径问题的一个较好方案.

关键词：粒子群算法车辆路径问题遗传算法

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道路沥青混凝土的绿色化探讨

武汉理工大学学报 2009年第4期31卷 41-44,52页

作者：陈美祝米轶轩刘至飞吴少鹏武汉理工大学硅酸盐材料工程教育部重点实验室武汉430070 武汉理工大学材料科学与工程学院武汉430070

沥青路面已在道路工程中得到广泛应用,但传统沥青混凝土的生产需要消耗大量的优质矿料、沥青及燃料,同时在高温生产中还会释放一定的有害气体。目前,传统的道路沥青混凝土材料还不可能弃之不用,新型绿色道路材料的开发尚有一个过程,因此... 详细信息

沥青路面已在道路工程中得到广泛应用,但传统沥青混凝土的生产需要消耗大量的优质矿料、沥青及燃料,同时在高温生产中还会释放一定的有害气体。目前,传统的道路沥青混凝土材料还不可能弃之不用,新型绿色道路材料的开发尚有一个过程,因此,对传统沥青混凝土的绿色化改造成为当务之急。为促进沥青路面与社会能源、环境、生态的可持续发展,探讨了道路沥青混凝土的绿色化内涵,分析了道路沥青混凝土设计与制备中的绿色处理技术,论述了道路沥青混凝土的生态化、高性能化以及功能化的发展与现状。

关键词：道路沥青混凝土绿色化生态化高性能化功能化

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RTM充模过程的气泡形成研究

武汉理工大学学报 2004年第11期26卷 5-7页

作者：冯武王继辉孟志华唐红艳武汉理工大学理学院武汉430070 武汉理工大学材料科学与工程学院武汉430070

气泡是树脂传递模型成型工艺 (RTM)中重要的缺陷之一 ,研究气泡形成机理与影响因素对提高 RTM制品质量具有重要意义。以多层方格布为对象 ,在理论分析的基础上 ,通过可视化试验对多层方格布断面气泡形成进行了研究。采用控制体 /有限元... 详细信息

气泡是树脂传递模型成型工艺 (RTM)中重要的缺陷之一 ,研究气泡形成机理与影响因素对提高 RTM制品质量具有重要意义。以多层方格布为对象 ,在理论分析的基础上 ,通过可视化试验对多层方格布断面气泡形成进行了研究。采用控制体 /有限元法编制的数值模拟程序对气泡尺寸的影响因素进行了分析。试验和数值模拟结果表明 ,气泡在横向纤维束末端形成 ,横向纤维束宽度与纤维束间通道宽度比值是影响气泡尺寸的重要因素。

关键词：气泡 RTM 数值模拟

PZT掺杂Ba(Cu_(1/2)W_(1/2))O_3的压电陶瓷的性能研究

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济南大学学报（自然科学版） 2004年第3期18卷 189-191页

作者：王守德刘福田程新济南大学材料科学与工程学院

采用固相合成法制备了 (1-xmol% )PZT -xmol%Ba(Cu1/ 2 W1/ 2 )O3 三元体系压电陶瓷 ,研究了三元体系内Ba(Cu1/ 2 W1/ 2 )O3 的掺杂比例x对材料的压电性能和介电性能的影响 ;讨论了Ba2 + 、Cu2 + 、W6+ 离子对PZT压电陶瓷进行改性的作... 详细信息

采用固相合成法制备了 (1-xmol% )PZT -xmol%Ba(Cu1/ 2 W1/ 2 )O3 三元体系压电陶瓷 ,研究了三元体系内Ba(Cu1/ 2 W1/ 2 )O3 的掺杂比例x对材料的压电性能和介电性能的影响 ;讨论了Ba2 + 、Cu2 + 、W6+ 离子对PZT压电陶瓷进行改性的作用机理 ;通过XRD和SEM测试手段 ,分析了物相组成和微观结构与材料性能的关系 ,发现合成的PZT材料均为钙钛矿结构 ,显微分析表明晶粒发育良好 ,其尺寸大约在 3～ 5μm之间 ;实验结果表明 ,配方为 0 .95PZT - 0 .0 5Ba(Cu1/ 2W1/ 2 )O3 压电陶瓷的d3 3 可达 6 0 5pC/N ,材料的机电耦合系数Kp 约为 0 .4 ,材料机械品质因数均低于 10 0 ,但相对介电常数εr 由 5 4 4提高到 14 0 0。

关键词： PZT 掺杂压电常数钨铜酸钡