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

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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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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Fine-structured TiO2 ceramic patterns on the ceramic surface fabricated by replication

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IOP Conference Series: materials Science and Engineering 2011年第1期20卷

作者： H D Kim T Nakayama B J Hong K Imaki T Yoshimura T Suzuki H Suematsu S W Lee Z Fu K Niihara Extreme Energy-Density Research Institute Nagaoka University of Technology 1603-1 Kamitomioka Nagaoka 940-2188 Japan Department of Physics and Electronics Graduate School of Engineering Osaka Prefecture University 1-1 Gakuencho Nakaku Sakai 599-8531 Japan Department of Environmental Engineering Sun Moon University Chungnam 336-708 Korea State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

The ability to fabricate high precision micro- to nanoscale structure in a wide variety of materials is of crucial importance for the advancement of microtechnology, nanotechnology and nanoscience. Also, the ability to create micrometer and sub-micrometer architecture for functional ceramics is a prerequisite of exploring the rich field of ceramic nanotechnology. In this work we fabricated three-dimensional oxide ceramic materials with fine-structure over multiple length scales by combining replication patterning technique, polyvinyl alcohol (PVA), oxide ceramic material (TiO2) nano-sized particles. Our study is based on the idea that PVA can be easily detached from a mold by peeling. We confirmed that micron and sub-micron-sized fine-structured oxide ceramic patterns containing nano-sized pores could be fabricated using this procedure. The results presented demonstrate the compositional and structural diversities that are possible with a facile approach and simple method.

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Influence of oxygen content on hardness of Cr(N,O) thin films deposited by an RF sputtering method

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IOP Conference Series: materials Science and Engineering 2011年第1期20卷

作者： J Shirahata T Ohori H Asami T Suzuki T Nakayama H Suematsu S W Lee Z Fu K Niihara Extreme Energy-Density Research Institute Nagaoka University of Technology 1603-1 Kamitomioka Nagaoka 940-2188 Japan Department of Mechanical Engineering Tomakomai national college of Technology 433 Nishikioka Tomakomai 059-1275 Japan Department of Environmental Engineering Sun Moon University Chungnam 336-708 Korea State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Cr(N,O) thin films were deposited by radio frequency reactive unbalanced magnetron sputtering on Si(100) or glassy carbon substrates. In this paper, the influence of oxygen content on hardness of Cr(N,O) thin films was investigated. The compositional analysis was carried out by Rutherford backscattering spectroscopy. It was found that these thin films contained up to 44at.% of oxygen. Phases in the samples were determined by X-ray diffraction. Cr(N,O) thin films show only peaks based on CrN. The microstructure was observed by utilizing a transmission electron microscope. At <1at.% of oxygen, crystallite size was approximately 100nm. Then, in accordance with increasing of oxygen content, crystallite size was decreased. The hardness of thin films was measured by using a nanoindenter. The micro hardness was changed with varying the oxygen content and the microstructure such as crystallite size. Thus, it was thought that the hardening on Cr(N,O) thin films was caused by solution hardening and/or Hall-Petch relationship.

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Inside Cover: Biofuel cells Based on the Immobilization of Photosynthetically Active Bioentities (ChemCatChem 3/2011)

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ChemCatChem 2011年第3期3卷 422-422页

作者： Dr. Christophe F. Meunier Dr. Xiao-Yu Yang Dr. Joanna C. Rooke Prof. Bao-Lian Su Laboratory of Inorganic Materials Chemistry (CMI) The University of Namur (FUNDP) 61 rue de Bruxelles B-5000 Namur (Belgium) Fax: (+32) 81-72-54-14 F.N.R.S. “ Chargé de Recherches ” Position Fonds National de la Recherche Scientifique 5 rue d'Egmont B-1050 Bruxelles (Belgium) State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Wuhan 430070 (China)

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Quick preparation and thermal transport properties of nanostructured β-FeSi_2 bulk material

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Chinese Physics B 2009年第1期18卷 287-292页

作者：李涵唐新峰曹卫强张清杰 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

This paper reports that the nanostructured β-FeSi2 bulk materials are prepared by a new synthesis process by combining melt spinning （MS） and subsequent spark plasma sintering （SPS）. It investigates the influence of linear speed of the rolling copper wheel, injection pressure and SPS regime on microstructure and phase composition of the rapidly solidified ribbons after MS and bulk production respectively, and discusses the effects of the microstructure on thermal transport properties. There are two crystalline phases （α-Fe2Si5 and ε-FeSi） in the rapidly solidified ribbons; the crystal grains become smaller when the cooling rate increases （the 20 nm minimum crystal of ε-FeSi is obtained）. Having been sintered for 1 min above 1123K and annealed for 5min at 923K, the single-phase nanostructured β- FeSi2 bulk materials with 200-500 nm grain size and 98% relative density are obtained. The microstructure of β-FeSi2 has great effect on thermal transport properties. With decreasing sintering temperature, the grain size decreases, the thermal conductivity of β-FeSi2 is reduced remarkably. The thermal conductivity of β-FeSi2 decreases notably （reduced 72% at room temperature） in comparison with the β-FeSi2 prepared by traditional casting method.

关键词： thermoelectric materials nanostructure thermal conductivity

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