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Dominant point detecting based non-uniform B-spline approximation for grain contour

Science china(Technological Sciences) 2007年第1期50卷 90-96页

作者： ZHAO XiuYang1, YIN YanSheng1,2.& YANG Bo3 1 Shandong key laboratory of Engineering Ceramics, Shandong {2.{4., Jinan 2.0061, china 2.School of materials, Ocean {2.{4. of china, Qingdao 2.6003, china 3 {14. key laboratory of advanced Technology for materials synthesis and processing, Wuhan {2.{4. of Science and Technology, Wuhan 4.0070, china 1. Shandong key laboratory of Engineering Ceramics Shandong University Jinan 250061 China 2. School of materials Ocean University of China Qingdao 266003 China 3. state key {2. of advanced Technology for {4. synthesis and processing Wuhan University of Science and Technology Wuhan 430070 China

Three-dimension reconstruction from serial sections has been used in the last decade to obtain information concerning three-dimensional microstructural ge-ometry. One of the crucial steps of three-dimension reconstruction is getting compact and fairing grain contours. Based on the achievement of closed raw con-tours of ceramic composite grains by using wavelet and level set, an adaptive method is adopted for the polygonal approximation of the digitized raw contours. Instead of setting a fixed length of support region in advance, the novel method computes the suitable length of support region for each point to find the best es-timated curvature. The dominant points are identified as the points with local maximum estimated curvatures. Periodic closed B-spline approximation is used to find the most compact B-spline grain boundary contours within the given tolerance. A flexible distance selection approach is adopted to obtain the common knot vector of serial contours consisting of less knots that contain enough degrees of freedom to guarantee the existence of a B-spline curve interpolating each contour. Finally, a B-spline surface interpolating the serial contours is generated via B-spline surface skinning.

关键词： composite B-spline dominant points control points grain contour

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Preparation and Microstructural Analysis of Ti_2.lC/TiAl(Nb) Composite

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Journal of Wuhan university of Technology({2. Science) 2007年第1期22卷 7-11页

作者：岳云龙 Shod of materials Science and Technology Jinan University

By using the spark plasma sintering process, Ti2.lC/TiAlcomposite with the addition of Niobium （Nb） was prepared in-situ and the microstructure of Ti2.lC/TiAl （Nb） composite was investigated by means of transmission electron microscopy （TEM） and high-resolution electron microscopy （HREM）. The results indicate that new-formed Ti2.IC particles disperse with a high degree of uniformity and well combine with the matrix. In the area of phase interface the d-spaces of Ti2.lC （100） and TiAI （110） were measured as 0.2.4. nm and 0.2.91 nm,respectively. The atom arrangement beside the interface was only partly corresponding, existing in semicoherent state. On the contrary, in the area of grain interface the d-spaces of TiAl （100） and TiAl （110） were measured as 0.2.62.nm and 0.2.31 nm,respectively and the atom arrangement beside the interface was almost corresponding, existing in coherent state.

关键词： Ti2.lC/TiAl CNb) composite interface semicoherent structure coherent structure

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Structure and Properties of Mg-doped SrBi_4.i_4._(15) Bi-layered Compounds

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Journal of Wuhan university of Technology({2. Science) 2008年第5期23卷 675-677页

作者：郝华 School of materials Science and Engineering Wuhan University of Technology state key {2. of advanced Technology for {4. synthesis and processing Wuhan University of Technology

The structure and properties of Mg-doped SrBi4.i4.15（SBT） were dicussed. Mg substitution into SBT had two possibilities states with the dopant amount variety. Mg cation substituted mostly into Sr^2. and the amount proportion was 68.11%.Mg ion will substitute into Ti ion site in perovskite layer when the doping amount increases. Polarization increases sharply when x=0.1 and then decreases becauses of the domain pinning. The Curie temperature of Mg-doped SBT is about 300 ℃ and there is a broad diffuse phase transition near Tc with a flat peak near the Ta of SBT.

关键词： Mg-doped bismuth layer structure ferroelectrics ferroelectric properties

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Preparation and electrochemical properties of urchin-like α-Fe_2._3 nanomaterials

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Science china(Technological Sciences) 2010年第7期53卷 1897-1903页

作者： TONG GuoXiu1,2. GUAN JianGuo2. WU WenHua1, LI LiangChao1, GUAN Yao2.& HUA Qiao1 1 College of Chemistry and Life Sciences, Zhejiang Normal univer{4., Jinhua 32.004.{2. 2.state key laboratory of advanced Technology for materials synthesis and {14., Wuhan univer{4. of Technology, Wuhan {12.,{2. 1. College of Chemistry and Life Sciences Zhejiang Normal University Jinhua 321004 China2. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Based on a facile glucose-guided hydrolyzing-heat-treating approach, urchin-like α-Fe2.3 nanomaterials with controllable morphology and crystallinity were prepared via adjusting the heat-treating temperature, and their electrochemical performances were investigated. The results showed that changing the heat-treating temperature can effectively control the structure and electrochemical property of the as-made products. The urchin-like α-Fe2.3 nanomaterials obtained by heat-treating at 300°C, composed of a mass of the shuttle fibrous brunches, had higher initial discharge capacity(14.5 mAhg-1) than those consisting of nanorods formed at 700°C. The above difference is ascribed to the urchin-like samples obtained at the relatively low heat-treating temperature, which, with low crystallinity, large SBET, and well-regulated porous, is helpful to the adsorption of electrolyte and the transport of lithium ion, resulting in the high activity and discharge-charge capacity.

关键词： urchin-like nanomaterials hematite electrochemical performance glucose-guided hydrolyzing-heat-treating approach

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Electronic Structure and Thermoelectric Properties of Na and Ni-doped Ca_3Co_2._6

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Journal of Wuhan university of Technology({2. Science) 2006年第3期21卷 94-96页

作者：闵新民 Department of Applied Chemistry Wuhan University of Technology Wuhan 430070 ChinaState Key Laboratory of Advanced Technology for Materials Synthesis and ProcessingWuhan University of Technology Wuhan 430070China

The electronic structures of Ca3Co2.6, Na and Ni doped models were studied by the quantum chemical software of Cambride Serial Total Energy Package （CASTEP） that is based on deusity function theory （DFT） and psendo-potential. The electronic conductivity, seebeck coefficient, thermal conduetivity and figure of merit （Z） were computed. The energy band structure reveals the form of the impurity levels due to the substitutional imapurity in semiconductors. Na-doped model stunts the character of p-type semiconductor, but Xi-doped model is n-type semiconductor. The calculation results show that the electric conduetirity of the doped model is higher than that of the non-doped model, while the Seebeck coefficient and thermal conductivity of the doped model are lower than those of the non-doped one. Because of the great increase of the electric conductivity, Z of Na- doped model is enhanced and thermoelectric properties are improved. On the other hand, as the large decline of Seebeck coefficient, Z of Ni-doped model is less than that of the non-doped model.

关键词： cobalt oxide substitutional impurity quantum chemical calculation electronic structure thermoelectric property

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Preparation,Structure and Dielectric Properties of Tungsten Bronze Ferroelectrics in SrO-Eu_2._3-TiO_2.Nb_2._5 System

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Journal of Wuhan university of Technology({2. Science) 2011年第2期26卷 312-315页

作者：胡长征 state laboratory Breeding Base of Nonferrous Metals and Specific {2. processing Guilin University of Technology key laboratory of Nonferrous {2. and New processing Technology Ministry of EducationGuilin University of Technology state key {2. of advanced Technology for {4. synthesis and processing Wuhan University of Technology

Compounds Sr4.u2.i4.b6O30 and Sr5EuTi3Nb7O30 with filled tetragonal tungsten bronze structure were prepared,and the dielectric characteristics and ferroelectric transition were *** ceramics displayed weak frequency dependence in room temperature dielectric constant,which decreased from 12. to 118 for Sr4.u2.i4.b6O30,from 2.6 to 195 for Sr5EuTi3Nb7O30 in the frequency range of 10 kHz to 1 *** present ceramics showed a diffuse ferroelectric phase *** frequency independent transition temperature （Tm） indicated the above compounds had no relaxor *** diffuseness （γ） was 1.4. and 1.64.for Sr4.u2.i4.b6O30 and Sr5EuTi3Nb7O30 *** weak ferroelectric of the present materials are indicated from the P-E hysteresis loops,and a small 2.r of 0.596 μC/cm2.and 0.068 μC/cm2.were observed for Sr4.u2.i4.b6O30 and Sr5EuTi3Nb7O30 respectively.

关键词： tungsten bronze dielectric properties X-ray diffraction phase transition

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Flame-retardant Mechanism of Magnesium Oxychloride in Epoxy Resin

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Journal of Wuhan university of Technology({2. Science) 2009年第1期24卷 127-131页

作者：秦麟卿 state key {2. of advanced Technology for {4. synthesis and processing Wuhan University of Technology Center for Material Research and Analysis Wuhan University of Technology

Flame-retardant mechanism of magnesium oxychloride （M OC） in EP was in-vestigated by limiting oxygen index （LOI）, XRD, SEM, TG-DTG and DSC. The results show that MOC performed well as an inorganic flame-retardant in EP. When the content of MOC is 50%, the LOI of EP reaches 2..6% and mass of residual char reaches 9.6%. The flame retarde mechanism of MOC is due to the synergies of diluting, cooling, catalyzing char forming and obstructing effects.

关键词： magnesium oxychloride epoxy resin flame-retardant properties flame retardedmechanism

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Toughening Modification of Unsaturated Polyester Resin Using HDI Trimer

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Journal of Wuhan university of Technology({2. Science) 2009年第4期24卷 627-630页

作者：段华军 School of materials Science and Engineering Wuhan University of Technology

HDI trimer was firstly used to improve the mechanical properties of hydroxyl-terminated unsaturated polyester （UP）. Mechanical properties measurements performed on the cured materials demonstrate a distinct improvement in intensity and toughness in the presence of HDI trimer and shows the change trends of increase and then decrease. The morphological analysis of the fracture surfaces shows that the micro-phase separated structures appear in modified UPR systems and changed from dendritric, dimple and to cystiform structures with the increase of HDI trimer content. The presence of the cystiform structures made the modified UPR systems present the best properties.

关键词： HDI trimer unsaturated polyester toughness mechanical properties morphology

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Microstructure and Properties of W-15Cu Alloys Prepared by Mechanical Alloying and Spark Plasma Sintering Process

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Journal of Wuhan university of Technology({2. Science) 2008年第3期23卷 399-402页

作者：章桥新 School of Mechanical and Electronic Engineering Wuhan University of Technology state key {2. of advanced Technology for {4. synthesis&processing Wuhan University of TechnologyWuhan 430070China

W-15Cu composite powders prepared by mechanical alloying （MA） of raw powders were consolidated by spark plasma sintering （SPS） process at temperature ranged 1 2.0-1 300 ℃ for 10 min and under a pressure of 30 MPa. By using high energy milling, particles containing very fine tungsten grains embedded in copper, called composite particles, could be produced. The W grains were homogeneously dispersed in copper phase, which was very important to obtain W-Cu alloy with high mechanical properties, fine and homogeneous microstructure. The microstructure and properties of W-15Cu alloys prepared by SPS processes at different temperature were researched. The results show that W-15Cu alloys consolidated by SPS can reach 99.6 % relative density, and transverse rupture strength （TRS） is 1 4.0.9 MPa, Rockwell C hardness （HRC） is 4..2. the thermal conductivity is 196 W/m-K at room temperature, the average grain size is less than 2.μm, and W-15Cu alloy with excellent properties, homogeneous and fine microstructure is obtained.

关键词： W-15Cu mechanical alloying spark plasma sintering (SPS)

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Phenomenon of “contact guidance” on the surface with nano-micro-groove-like pattern and cell physiological effects

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Chinese Science Bulletin 2009年第18期54卷 3200-3205页

作者： ZHOU Feng 1,2. YUAN Lin 1,3, HUANG He 1,2.& CHEN Hong1,2.1 state {4. {2. of advanced Technology for materials synthesis and processing, Wuhan 4.0070, china 2.School of materials Science and Engineering, Wuhan {14.sity of Technology, Wuhan 4.0070, china 3 Biomedical materials Research Center, Wuhan {14.sity of Technology, Wuhan 4.0070, china state key {2. of advanced Technology for {4. synthesis and processing Wuhan 430070 China School of materials Science and Engineering Wuhan University of Technology Wuhan 430070 China Biomedical materials Research Center Wuhan University of Technology Wuhan 430070 China

The topography of material surface has important influence on cell behavior and physiological functions. Groove-like pattern has drawn much attention among various patterns, due to the phenomenon of "contact guidance" induced by this kind of topography. This review mainly focuses on "contact guidance" formation as well as its influence on cell behavior and physiological effects. The possible mechanisms of "contact guidance" formation were discussed. The research trend and the potential applications were also suggested.

关键词：细胞行为生理功能材料表面逻辑效应触指纳米微米生理效应

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