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The investigation of PMS-PNW-PZT piezoelectric ceramics

The investigation of PMS-PNW-PZT piezoelectric ceramics

12th International Meeting on Ferroelectricity, IMF-12 and the 18th IEEE International Symposium on Applications of Ferroelectrics, ISAF-18

作者： Dong, Zhang Weibing, Ma Qingchi, Sun Hongye, Gao Yong, Zhang Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education School of Materials Science and Engineering Tianjin University Tianjin 300072 China State Key Laboratory of New Ceramic and Fine Processing Tsinghua University China

Pb0.95Sr0.05[(Mn1/3Sb2/3) 0.06(Ni1/2W1/2)x(Zr 0.49Ti0.51)1-x-0.06]O3 (PMS-PNW-PZT) (x = 0.01∼0.04) were prepared by using traditional technique with solid reaction process. The effects of PNW contents and sintering temperatures on microstructure, dielectric and piezoelectric properties of PMS-PNW-PZT ceramics were investigated. When the amount of doping content was about 2 mol% and the sintering temperature was 1250°C, the optimum values of buck density, mechanical quality factor, dielectric loss, piezoelectric constant, dielectric constant, planar coupling coefficient were obtained as follows:ρ = 7.54 g/cm3, Qm = 2800, tanδ = 0.27%, d33 = 360pC/N, Ε3T3/Ε0 = 1990, kp = 0.63, which can meet the requirements of piezoelectric transformers.

关键词： Piezoelectric ceramics

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Structure Characterization calculation of Tetragonal Zirconia

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IOP Conference Series: materials Science and Engineering 2011年第20期18卷

作者： J Feng X Y Wang X R Ren Z C Huang R Zhou W Pan State Key Laboratory of New Ceramics and Fine Processing Department of Materials Science and Engineering Tsinghua University Beijing 100084 P R China Key Laboratory of Advanced Materials of Precious-Nonferrous Metals Education Ministry of China Kunming University of Science and Technology Kunming 650093PRChina

Structure characterization and elastic properties of tetragonal phase of zirconia have been investigated by density functional theory (DFT). The XRD spectrums and vibration properties of Raman active modes of T-ZrO2 were calculated and the results were compared with references. The calculated results have showed researchers may distinguish cubic and tetragonal phases used XRD spectrums in the 2 range of 72.5°-75.5°, 122°-129° and 138°-148°. The calculated vibrated properties of Raman active modes as follows: the modes of Zr-O stretching are 262.6, 486.2, and 641.6 cm−1 the modes of Zr-O bending and O-O coupling are 344.4 and 606.9 cm−1 and the modes of Zr-O-Zr or O-Zr-O bending is 141.2 cm−1.

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Study on BPNN based welding joint properties soft sensing method

Study on BPNN based welding joint properties soft sensing me...

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2010 6th International Conference on Natural Computation, ICNC'10

作者： Yufen, Gu Cheng, Xue Yu, Shi Ding, Fan Key Laboratory of Non-ferrous Metal Alloys and Processing Lanzhou University of Technology Ministry of Education 730050 Lanzhou China State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials Lanzhou University of Technology 730050 Lanzhou China

ISBN: (纸本)9781424459612

It is found that the mechanical properties of welded joints is mainly related to the welding heating input and complicated mutual effects in multi composition welding material. According to this principle, a soft sensor model based on the BP neural network (BPNN) is designed. The soft sensing BPNN has been constructed by use of the BP network toolkit of the Matlab software. The dates of five kinds of Low-Ally steels mechanical properties under different welding thermal cycle which used to train and test the BPNN have been obtained by welding thermal simulator. In this way, the soft sensing model for welding joint mechanical properties testing has been established. The BPNN has been tested by use of testing samples from the obtained data. By comparing the predicting date and the actual date, it shows that the soft sensing model has acceptable precision. The soft sensing method provides a new way for predication of mechanical properties of welding joints. © 2010 IEEE.

关键词： Neural networks

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Structural Analysis and Optimal Design for Water Tube Panel in an Alkali Recovery Boiler

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Engineering（科研） 2010年第5期2卷 353-359页

作者： Zaili Zhao Jinsheng Xiao Ying Wu Xiaojun Zhang Zhiming Wang School of Energy and Power Engineering Wuhan University of Technology School of Automobile Engineering Wuhan University of Technology State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology W

Alkali recovery aiming at recovering NaOH is the best available technology in China's pulp and paper industry;an alkali recovery boiler is a popular one among all alkali recovery units. For the purpose of designing the most reasonable tube-panel of an evaporator in a 1500 t/d alkali recovery boiler, a total of 8 kinds of cases are put forward for finite element analysis. The modeling, meshing and calculation are carried out for each case. The stress values and their distribution rules are revealed in this paper. The slotting size for the water tubes panel is analyzed by using the optimum design module of ANSYS. After all cases are compared with each other, the optimal one is developed and exemplified in conclusion.

关键词： Alkali Recovery Boiler Water Tubes Panel Finite Element Thermal Stress Optimum Design

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Nanowire-Based Electrodes with Improved Electric Conductivity

Nanowire-Based Electrodes with Improved Electric Conductivit...

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ICAM新能源材料中的物理国际研讨会

作者： Lin Xu Liqiang Mai Bin Hu Xu Xu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China Department of Chemistry and Chemical Biology Harvard University Cambridge Massachusetts 02138 USA

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Study on Impact Factor of Sci-Tech Journal in China Using Genetic Programming

Study on Impact Factor of Sci-Tech Journal in China Using Ge...

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International Conference on Computational Intelligence and Software Engineering (CiSE)

作者： Yongxiang Zhao Meifang Li State Key Laboratory of Advanced Technology of Materials Synthesis and Processing Wuhan University of Technology Wuhan China School of Management Wuhan University of Technology Wuhan China

In this paper, we establish nonlinear GP model between impact factor of sci-tech journal and related indexes based on genetic programming approach. The proposed GP model utilizes average authors, number of district, number of affiliation, international paper ratio and foundation paper ratio as the inputs, and uses impact factor as the output. The journals data from Chinese S&T Journal Citation Reports in 2005 are used as experimental data. The experimental results show that impact factor is mainly related to average authors and foundation paper ratio, and nearly has nothing to do with number of district, number of affiliation and international paper ratio. Therefore, increasing the average authors and foundation paper ratio of sci-tech journal will help to promote the impact factor of journal and improve the quality of journal to some extent.

关键词： Genetic programming Indexes Training Servers Data models Analytical models

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An Indoor Positioning Algorithm Based on Path Tracking Assistance

An Indoor Positioning Algorithm Based on Path Tracking Assis...

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International Conference on Computational Intelligence and Software Engineering (CiSE)

In real life, people always move according to a certain paths, for example, walking from one side of corridor to the other side of it, but not passing through the wall, and so on. Therefore, all kinds of possible paths could be predefined, then the indoor positioning systems can make full use of these paths to further improve the positioning accuracy. In this paper, an indoor positioning algorithm based on path tracking assistance is presented which makes the most of path information in indoor environment to optimize the searched subspaces of positioning algorithm. Experimental results demonstrated that the proposed path tracking assistance algorithm can improve the 73% accuracy in 3 meters of traditional kNN algorithm to 92% in a typical office building testbed when the subspaces are defined rationally.

关键词： Accuracy Buildings Radar tracking Wireless LAN Legged locomotion Tracking Indoor environments

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Nanoparticles: Well Shaped Mn3O4Nano-octahedra with Anomalous Magnetic Behavior and Enhanced Photodecomposition Properties (Small 4/2011)

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Small 2011年第4期7卷

作者： Yu Li Haiyan Tan Xiao-Yu Yang Bart Goris Jo Verbeeck Sara Bals Pierre Colson Rudi Cloots Gustaaf Van Tendeloo Bao-Lian Su State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road 430070 Wuhan Hubei China Laboratory of Inorganic Materials Chemistry (CMI) The University of Namur (FUNDP) 61 rue de Bruxelles B-5000 Namur Belgium EMAT University of Antwerp Groenenborgerlaan 171 B-2020 Antwerpen Belgium Group of Research in Energy and Environment from Materials (GreenMat) Chemistry Department B6 University of Liege B-4000 Liege (Sart-Tilman) Belgium

Very uniform and well shaped Mn 3 O 4 nano-octahedra are synthesized using a simple hydrothermal method under the help of polyethylene glycol (PEG200) as a reductant and shape-directing agent. The nano-octahedra formation mechanism is monitored. The shape and crystal orientation of the nanoparticles is reconstructed by scanning electron microscopy and electron tomography, which reveals that the nano-octahedra only selectively expose {101} facets at the external surfaces. The magnetic testing demonstrates that the Mn 3 O 4 nano-octahedra exhibit anomalous magnetic properties: the Mn 3 O 4 nano-octahedra around 150 nm show a similar Curie temperature and blocking temperature to Mn 3 O 4 nanoparticles with 10 nm size because of the vertical axis of [001] plane and the exposed {101} facets. With these Mn 3 O 4 nano-octahedra as a catalyst, the photodecomposition of rhodamine B is evaluated and it is found that the photodecomposition activity of Mn 3 O 4 nano-octahedra is much superior to that of commercial Mn 3 O 4 powders. The anomalous magnetic properties and high superior photodecomposition activity of well shaped Mn 3 O 4 nano-octahedra should be related to the special shape of the nanoparticles and the abundantly exposed {101} facets at the external surfaces. Therefore, the shape preference can largely broaden the application of the Mn 3 O 4 nano-octahedra.

关键词： magnetic properties Mn3O4 nano-octahedra photodecomposition rhodamine B tomography

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Magnetic order in the pseudogap phase of HgBa2CuO4+δ studied by spin-polarized neutron diffraction

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Physical Review B 2011年第22期84卷 224508-224508页

作者： Yuan Li V. Balédent N. Barišić Y. C. Cho Y. Sidis G. Yu X. Zhao P. Bourges M. Greven Department of Physics Stanford University Stanford California 94305 USA Laboratoire Léon Brillouin CEA-CNRS CEA-Saclay F-91191 Gif sur Yvette France T.H. Geballe Laboratory for Advanced Materials Stanford University Stanford California 94305 USA 1. Physikalisches Institut Universität Stuttgart D-70550 Stuttgart Germany BK21 Team and Department of Nano Fusion Technology Pusan National University Miryang 627-706 Republic of Korea School of Physics and Astronomy University of Minnesota Minneapolis Minnesota 55455 USA State Key Lab of Inorganic Synthesis and Preparative Chemistry College of Chemistry Jilin University Changchun 130012 China

Spin-polarized neutron diffraction experiments have revealed an unusual q=0 magnetic order in the model high-temperature superconductor HgBa2CuO4+δ (Hg1201) below the pseudogap temperature T* [Y. Li et al., Nature (London) 455, 372 (2008)]. Together with results for the structurally more complex compound YBa2Cu3O6+δ (YBCO) [B. Fauqué et al., Phys. Rev. Lett. 96, 197001 (2006); H.A. Mook et al., Phys. Rev. B 78, 020506 (2008)], this establishes the universal existence of a genuine novel magnetic phase in underdoped cuprates with high maximal Tc (above 90 K at optimal doping). Here we report a systematic study of an underdoped Hg1201 sample (Tc=75 K), the result of which is consistent with the previously established doping dependence of the magnetic signal. We present an assumption-free analysis of all the data available for Hg1201. Depending on how the hole concentration is estimated, comparison with the results for YBCO leads to different scenarios for the competition between the q=0 magnetic order and the spin-density-wave order found in heavily underdoped YBCO.

关键词： NEUTRON diffraction SUPERCONDUCTORS COMPLEX compounds DENSITY wave theory PHASE diagrams

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Thermal Expansion Behavior of Hexagonal ZnS Single-Crystal Nanowires Embedded in Anodized Aluminum Oxide Template

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Chinese Physics Letters 2010年第10期27卷 168-171页

作者：于彦龙郑立辉徐鑫孙宏宇 Department of Applied Technology Daqing Petroleum Institute Qinhuangdao 066004 Beijing National Center for Electron Microscopy The State Key Laboratory of New Ceramics and Fine Processing. Laboratory of Advanced Materials Department of Materials Science and Engineering Tsinghua University Beijing 100084

The thermal expansion behavior of semiconductor single-crystal nanowire arrays is of importance for their applications in electronic and optoelectronic nanodevices. We prepare hexagonal ZnS single-crystal nanowire arrays growing along the [110] direction via electrodeposition. The thermal expansion properties of the as-prepared ZnS nanowires have been studied by in situ x-ray diffraction method. The thermal expansion coefficient （TEC） of the ZnS nanowires decreases consistently from room temperature to 225℃ where it reaches a minimum value, and then increases rapidly. The average TEC in the studied temperature range is 4.74 × 10-6/℃, which is smaller than that of the conventional bulk counterpart.

关键词： THERMAL expansion NANOWIRES ELECTROFORMING ZINC sulfide TEMPERATURE effect DOPED semiconductors OPTOELECTRONIC devices

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