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A Note on Hermitian-Einstein Metrics on Parabolic stable Bundles

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Acta Mathematica sinica,English series 2001年第1期17卷 77-80页

作者： Jia Yu LI M. s. NARAsIMhaN Institute of Mathematics Academy of Mathematics and System Sciences Academia Sinica Institute of Mathematics Fudan University Mathematics section International Centre for Theoretic Physics

Let M be a compact complex manifold of complex dimension two with a smooth K hler metric and D a smooth divisor on . If E is a rank 2 holomorphic vector bundle on M with a stable parabolic structure along D, we prove that there exists a Hermitian-Einstein metric on E’=E|sub> \Dsub> compatible with the parabolic structure, whose curvature is square integrable.

关键词： Hermitian-Einstein metric Parabolic stable bundle Kahler manifold

THE ADAPTIVE FINITE ELEMENT REMEsHING IN LARGE DEFORMATION OF METAL FORMING

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Acta Metallurgica sinica(English Letters) 2004年第3期17卷 323-326页

作者： X.X.Guo J.s.Liu Advanced Manufacturing Technology and Engineering Department Shenzhen Polytechnic Shenzhen 518055ChinaSchool of Material Science and Engineering Taiyuan Heavy Machinery Institute Taiyuan 030024 China

The adaptive remeshing technique for quadrilateral elements consists of modules thetrigger of remeshing, the new mesh generation, adaptive refinement and interpolationof field variables. The new adaptive mesh genemtion is the key problem. First, acoarse mesh is created by using 'loop algorithm'. subsequent local mesh adaptiverefinement is performed based on effective strain. Finally, a typical example of upset-ting is given to test efficient of techniques, from which it is verified that the remeshingalgorithm developed here exhibits good performance and has high accuracy.

关键词： adaptive remeshing quadrilateral elements metal forming

Flow characteristics by particle image velocimetry in liquefied natural gas vaporizer model with several baffles

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Journal of Central south University 2011年第5期18卷 1719-1725页

作者： H.s.Chung s.M.sayeed-Bin-Asad Berkah Fajar Y.H.shin H.M.Jeong Department of Mechanical and Precision Engineering Institute of Marine Industry445 Inpyeong DongTongyeongGyeongsangnamdo650-160Korea Department of Mechanical and Precision Engineering Gyeongsang National University445 Inpyeong DongTongyeongGyeongsangnamdo650-160Korea Department of Mechanical Engineering University of DiponegoroSemarangIndonesia

shell-and-tube vaporizers are the most commonly used and dominated types of vaporizers in liquefied natural gas （LNG） realm. Due to efficient performance, shell-side flow in this type of vaporizers has received considerable attention and has been investigated extensively. However, the detailed flow structure in the shell needs to be determined for reliable and effective design. Therefore, the objective of this study was to clarify the flow structure in shell by particle image velocimetry （PIV）. Experiments were conducted using two types of model; 15% baffle cut having inlet and outlet positions !n the direction of 90° to the cut and 30% baffle cut having inlet and outlet positions in the direction of 180° to the cut. Each test section is 169 mm in inner diameter and 344.6 mm in length. The flow features were characterized in different baffle cuts with regards to the velocity vector field and velocity distribution. The results show that the flow characteristics of 15% baffle cut type vaporizer are comparable to those of 30% baffle cut type vaporizer.

关键词： particle image velocimetry liquefied natural gas vaporizer vortex turbulence

Effect of welding processes on mechanical and microstructural characteristics of high strength low alloy naval grade steel joints

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Defence Technology（防务技术） 2015年第3期11卷 308-317页

作者： s.RAGU NAThaN V.BALAsUBRAMANIAN s.MALARVIZHI A.G.RAO Department of Manufacturing Engineering Annamalai University Centre for Materials Joining & Research (CEMAJOR) Department of Manufacturing EngineeringAnnamalai University Naval Materials Research Laboratory (NMRL)

Naval grade high strength low alloy(HsLA) steels can be easily welded by all types of fusion welding processes. However, fusion welding of these steels leads to the problems such as cold cracking, residual stress, distortion and fatigue damage. These problems can be eliminated by solid state welding process such as friction stir welding(FsW). In this investigation, a comparative evaluation of mechanical(tensile, impact,hardness) properties and microstructural features of shielded metal arc(sMA), gas metal arc(GMA) and friction stir welded(FsW) naval grade HsLA steel joints was carried out. It was found that the use of FsW process eliminated the problems related to fusion welding processes and also resulted in the superior mechanical properties compared to GMA and sMA welded joints.

关键词：低合金高强度钢焊接工艺钢接头组织结构力学性能搅拌摩擦焊机械特性焊接方法

Transition Metal silicide Nanowires Growth and Electrical Characterization

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Chinese Physics Letters 2009年第12期26卷 206-209页

作者：彭祖林 LIANG s. 邓罗根 school of science Beijing Institute of Technology Beijing 100081 science and Engineering of Materials Program Arizona State University Tempe AZ 85287 USA

We report the characterization of self-assembled epitaxially grown transition metal, Fe, Co, Ni, silicide nanowires （TM-NW） growth and electrical transport properties. NWs grown by reactive deposition epitaxy on various silicon surfaces show a dimension of 10nm by 5nm, and several micrometers in length. NW orientations strongly depend on substrate crystal orientation, and follow the substrate symmetry. By using conductive-AFM （c-AFM）, the electron transport properties of one single NW were measured, the resistivity of crystalline nickel silicide NW was estimated to be 2×10-2Ω＆#12539;cm.

关键词： surfaces interfaces and thin films Nanoscale science and low-D systems

Uncovering the Genetic Networks Driving stomatal Lineage Development

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Molecular Plant 2020年第10期13卷 1355-1357页

作者： Despina samakovli George Komis Jozef(s)amaj Centre of the Region hanáfor Biotechnological and Agricultural Research Faculty of SciencePalack(y)University Olomouc(S)lechtitel(u)2778371 OlomoucCzech Republic

Recent studies on stomatal ontogenesis and function provided important insights into plasticity strategies that plants employ to optimize their development by balancing their requirements for carbon and water under diverse environmental *** on stomata progressed from physiological and cell biological approaches for the identification of important regulatory genes by genetic tools to recent isolation of stomatal guard cells by different techniques in order to analyze their transcriptomic and proteomic ***,development of the stomatal lineage appeared as an appealing model to study cell identity,division,and morphology pattems in plants.

关键词： insight covering balancing

Optimal weighting scheme for averaging regional temperature (Ⅰ)--Theoretical analysis

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Chinese science Bulletin 1995年第16期40卷 1351-1356页

作者： shen s.s.P. 王晓春梁幼林李荣凤 Department of Mathematical sciences University of Alberta. Edmonton Canada T6G 2G1 Institute of Atmospheric Physics Chinese Academy of Sciences. Beijing 100080. China

Inadequacy of a spatial data sampling scheme often causes confusion When consideringglobal, hemispherical and regional temperature averages. Jones et al.,ha.sen et al.,Vinnikov et al. used different methods in their r... 详细信息

关键词： optimal weighting scheme regional average temperature arithmetic average.

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溴化马来松香环氧树脂的制备及阻燃性

化工学报 2009年第2期60卷 514-518页

作者：黄活阳哈成勇李因文沈敏敏中国科学院广州化学研究所中国科学院纤维素重点实验室广东广州510650 中国科学院研究生院北京100039

以马来松香和液溴为原料,合成了溴化马来松香;再与环氧氯丙烷发生酯化反应、闭环反应,合成了溴化马来松香环氧树脂。结果表明,在适宜的条件下,合成的环氧树脂的环氧值为0.30 mol.(100 g)-1。用红外光谱(FT-IR)、核磁共振谱(1H NMR)和元... 详细信息

以马来松香和液溴为原料,合成了溴化马来松香;再与环氧氯丙烷发生酯化反应、闭环反应,合成了溴化马来松香环氧树脂。结果表明,在适宜的条件下,合成的环氧树脂的环氧值为0.30 mol.(100 g)-1。用红外光谱(FT-IR)、核磁共振谱(1H NMR)和元素分析法对产物进行了表征。采用固化剂4,4′-二氨基二苯甲烷(DDM)对产物进行了固化。实验证明,溴化马来松香环氧树脂固化物具有较好的阻燃性。

关键词：溴化马来松香环氧树脂阻燃固化

Microstructural Evolution in Directionally solidified Ni-Base superalloy IN792+Hf

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Journal of Materials science & Technology 2008年第1期24卷 110-114页

作者： s.M.seo I.s.Kim J.H.Lee C.Y.Jo H.Miyahara K.Ogi High Temperature Materials Research Group KIMs Changwon641-010Korea Dept.of Metall.& Mater.Eng. Changwon Univ. Changwon641-773Korea Dept.of Mater.sci.& Eng. Kyushu Univ. Fukuoka819-0395Japan Oita National College of Technology Oita 870-0152Japan

Microstructural evolution during directional solidification （Ds） of Ni-base superalloy IN792＋Hf has been investigated with an emphasis on theγ′precipitates and MC-type *** quantitative image analyses revealed that the increase in the solidification rate up to 100μm/s at constant thermal gradient of 178 K/cm resulted in a fine and uniform distribution ofγ′*** relationship between the as-castγ′size and cooling rate was also determined for Ds IN792＋*** the mean time,the MC carbide size was found to be dependent both on the solidification rate and the s/L interface morphology while the area fraction of MC carbide was significantly influenced by the s/L interface morphology.

关键词： IN792 MC corbide Gamma prime solidification rate