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INFLUENcES OF cASTING SPEED AND SEN DEPTH ON FLUID FLOW IN THE FUNNEL TYPE MOLD OF A THIN SLAB cASTER

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Acta Metallurgica Sinica(English Letters) 2007年第1期20卷 15-26页

作者： B.W. Li X.Y. Tian E.G. wang j.c. He Key Laboratory of National Education Ministry for Electromagnetic Processing of Materials Northeastern University Shenyang 110004 China

In recent years, thin slab continuous casting technology has been widely used to improve the quality of the product and to reduce the cost. One of the challenges faced by this technology is to design reasonable flow patterns, which strongly affect the surface and inner properties of the final slab in the mold. With the fixed scales and complex geometrical structures of nozzle and funnel type mold, a series of numerical simulations are made to analyze the flow patterns in melt steel using finite volume method based on structured body fitted coordinate grids. The cFD （computational fluid dynamics） package is validated first using one typical case described in previously published studies, and then it is developed to study the effect of operational parameters on fluid flow in thin slab caster. Two operational parameters, casting speed and SEN （submerged entry nozzle） depth, are mainly considered for numerical analysis. On the basis of present simulations, the reasonable SEN submergence depths corresponding to different casting speeds are suggested according to fluid flow characteristics like, flow jet impingement on the narrow side of the mold, flow speed of the melt steel beneath the meniscus and the recirculation region. This is the first stage of study on the numerical analysis of the whole thin slab casting process with electromagnetic brake.

关键词： continuous casting thin slab submerged entry nozzle (SEN) numerical analysis funnel type mold standard k-ε model RNG (renormalization group) k-ε model

Performance of Sacrificial Anodes in Reinforced concrete

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武汉理工大学学报 2010年第17期32卷 165-169页

作者： TU L Q DONG c wang c j ZHANG G Z LEI Y F SHUI Z H School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China Wuhan Harbour Engineering Design & Research co. Ltd Wuhan 430071China Key Lab of Large-span Bridge construction Technology Minstry of CommunicationsWuhan 430071China Zhejiang Province Zhoushan Island Linking construction commanding Department Zhoushan 316032China

The electrochemical performance of the anodes was measured in the reinforced concrete test block in artificial sea water. Their chemical composition,metallographic structure and surface morphology were analyzed. It was found that concrete mix proportion and the covering layer thickness had an impact on the performance of sacrificial anodes. The thermal-sprayed zinc alloy anodes had a more negative corrosion potential and larger galvanic current than metallurgy ones in the same conditions. They had similar chemical composition. But metallographic structure showed that the structure of thermal-sprayed zinc alloy anodes was a loose porous. This structure had the catalytic effect on the andes electrochemical reactions and made the anodes the electrochemical exchange current density increase and the corrosion potential move to negative direction.

关键词： sacrificial anode reinforced concrete concrete mix proportion thermal-sprayed anodes electrochemical performance

Research on Service Life Prediction Model of concrete Structure of Sea-crossing Bridge

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武汉理工大学学报 2010年第17期32卷 141-146页

作者： wang c j ZHANG G Z LIU K X TU L Q LI j H QIN M Q Zhejiang Province Zhoushan Island Linking construction commanding Department Zhejiang 316032China Wuhan Harbor Engineering Design & Research Institute co. Ltd Wuhan 430071China Key Lab of Large-span Bridge construction Technology Ministry of CommunicationWuhan 430071China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China

According to the chloride corrosion environment,service life prediction model of concrete structure of sea-crossing bridge was built using modified Fick's second law and the whole probability calculation method,which was suitable for china. Furthermore,a visual service life prediction program of concrete structure was developed by optimized Monte carlo method. Meanwhile,Life 365 program was compared,indicating reliability of the prediction program. Finally,the validity of prediction model was verified in jinTang Bridge of Zhoushan Island Mainland Linkage Project.

关键词： sea-crossing bridge concrete structure service life prediction model verify

Design and Pilot Programs of Marine Exposure Station of A Sea-crossing Bridge

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武汉理工大学学报 2010年第17期32卷 131-136页

作者： QIN M Q wang c j TU L Q ZHANG G Z SUN T X Wuhan Harbour Engineering Design and Research co. Ltd. Wuhan 430071China Key Lab of Large-span Bridge construction Technology Ministry of CommunicationsWuhan 430071China Zhejiang Province Zhoushan Island Linking construction commanding Department Zhoushan 316032China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China

This paper presents the Location,the structural design as well as the anti-corrosion and the pilot programs of the marine exposure station of Zhoushan Archipelago seas sea-crossing bridges. Subjected to the marine environment,the concrete structures in serve with different mixing proportions,cover thickness,additional anti-corrosion measures such as rust-preventing agent,coating,penetration crystalline waterproof material,silicone and permeable fabric were studied. Those results obtained provide important information for the maintenance of marine concrete and the structural design of sea-crossing bridges in the above sea area.

关键词： exposure station sea-crossing bridge marine concrete durability design

Microstructures and electrical properties of La0.8Sr0.2MnO3 cathode by suspension precursor plasma spraying

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Microstructures and electrical properties of La0.8Sr0.2MnO3 ...

第九届全国氢能学术会议

作者： X.M.wang,c.j.Li,c.X.Li,Gj.Yang Xi’an jiaotong University,china

Suspension precursor plasma spraying(SPPS)allows achieving finely structured coatings whose thickness is between few tens and few hundreds of *** this work,SPPS were used to prepare LaSrMnO(LSM) cathodes for solid oxide fuel cell(SOFc) applications.A suspension of LSM powder which was fabricated by glycine-nitrate processing

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反射三次谐波产生与晶体对称性

物理学报 1987年第11期 1416-1426页

作者：霍崇儒,c.c.wang,j.L.BOMBAcK,j.V.jAMES 中国科学院物理研究所 Ford Motor company Ford Motor company Ford Motor company

在单晶硅和经离子注入的硅样品上测得了反射三次谐波。像我们的理论计算中所证明的那样,当样品绕表面法线转动时,线偏振的三次谐波强度显示了晶体的旋转对称性,对于轻注入的样品,存在一个注入剂量的临界值,高于此值,三次谐波信号与转动... 详细信息

在单晶硅和经离子注入的硅样品上测得了反射三次谐波。像我们的理论计算中所证明的那样,当样品绕表面法线转动时,线偏振的三次谐波强度显示了晶体的旋转对称性,对于轻注入的样品,存在一个注入剂量的临界值,高于此值,三次谐波信号与转动无关。作为剂量的函数,三次谐波强度对晶格损伤极为敏感。这使三次谐波技术可以在半导体工艺中用作监测离子注入的均匀程度。

关键词：三次谐波产生单晶硅离子注入反射镜注入剂量离子掺杂反光镜晶体对称性计算方法傅里叶分析调和分析

在强烈地震中产生桥面滑移和桥墩碰撞的桥梁性能研究

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钢结构(中英文) 2008年第5期 71-72页

作者： wang, c.j. Shih, M.H.

以一座由简支橡胶支座支撑的多跨混凝土桥梁为实例,对桥面的滑移和回填土桥墩的碰撞进行了研究。在1999年的集集地震中,该桥遭受了水平和竖直两个方向的地震作用。为考虑土壤-结构的相互作用,回填土的刚度和强度常数由桥墩的倾角和回填... 详细信息

以一座由简支橡胶支座支撑的多跨混凝土桥梁为实例,对桥面的滑移和回填土桥墩的碰撞进行了研究。在1999年的集集地震中,该桥遭受了水平和竖直两个方向的地震作用。为考虑土壤-结构的相互作用,回填土的刚度和强度常数由桥墩的倾角和回填土的支座反力共同决定。为评估桥梁的性能,将时程分析法应用在离散的质点-弹簧模型上,模拟大量的非线性行为,包括支座的摩擦滑移,桥面和桥墩的碰撞反应和回填土的弹塑性压缩量。模型中的主要参数包括伸缩缝间距、支座的摩擦系数和土壤的强度极限。模拟结果证实,支座垫上的摩擦滑移和回填土的塑性变形是避免强烈地震中桥面坍落的关键因素。模型中支座的摩擦系数为0·1;·2,桥墩在碰撞中产生的最大倾角减少了1/10。甚至当土壤强度降低一半时,桥面的最大位移变化也不会超过两倍。在任何一种情况下,桥面的倒塌都不太可能发生。

关键词：碰撞桥墩桥面抗震性能

Study on Pulse Electrolytic-Abrasive Machining

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Study on Pulse Electrolytic-Abrasive Machining

NEcAB family of neuronal calcium-binding proteins in health and disease

The International conference on Surface Finishing Technology and Surface Engineering

作者： T. wang and j.c.Liu Harbin University of Science &Technology, 52 Xuefu Road, Harbin, 150080, china. Harbin Institute of Technology, 92 Xidazhi Street, Harbin, 150001, china.

In order to control low current density steadily, the direct current is replaced by a pulse current for Electrolytic-Abrasive Machining (EAM). In this paper, a fresh viewpoint for the reasonable use of pulse current in EAM is first advanced, i.e. pulse current is able to regulate the relative participating time between electrolytic and abrasive actions. The experiment results show that the pulse current is conducive to paucity of metal removal, and mirror or quasi-mirror finish can be achieved conveniently.

关键词： pulse electrochemical machining Electrolytic-Abrasive Machining mirror finishing

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Neural Regeneration Research 2025年第5期20卷 1236-1243页

作者： Diones Bueno Michael K.E.Schafer Sudena wang Michael j.Schmeisser Axel Methner Institute for Molecular Medicine University Medical Center of the Johannes Gutenberg-UniversityMainzGermany Department of Anesthesiology University Medical Center of the Johannes Gutenberg-UniversityMainzGermany Institute of Anatomy University Medical Center of the Johannes Gutenberg-UniversityMainzGermany

The N-terminal EF-hand calcium-binding proteins 1–3(NEcAB1–3) constitute a family of predominantly neuronal proteins characterized by the presence of at least one EF-hand calcium-binding domain and a functionally less well characterized c-terminal antibiotic biosynthesis monooxygenase domain. All three family members were initially discovered due to their interactions with other proteins. NEcAB1 associates with synaptotagmin-1, a critical neuronal protein involved in membrane trafficking and synaptic vesicle exocytosis. NEcAB2 interacts with predominantly striatal G-protein-coupled receptors, while NEcAB3 partners with amyloid-β A4 precursor protein-binding family A members 2 and 3, key regulators of amyloid-β production. This demonstrates the capacity of the family for interactions with various classes of proteins. NEcAB proteins exhibit distinct subcellular localizations: NEcAB1 is found in the nucleus and cytosol, NEcAB2 resides in endosomes and the plasma membrane, and NEcAB3 is present in the endoplasmic reticulum and Golgi apparatus. The antibiotic biosynthesis monooxygenase domain, an evolutionarily ancient component, is akin to atypical heme oxygenases in prokaryotes but is not wellcharacterized in vertebrates. Prokaryotic antibiotic biosynthesis monooxygenase domains typically form dimers, suggesting that calcium-mediated conformational changes in NEcAB proteins may induce antibiotic biosynthesis monooxygenase domain dimerization, potentially activating some enzymatic properties. However, the substrate for this enzymatic activity remains uncertain. Alternatively, calcium-mediated conformational changes might influence protein interactions or the subcellular localization of NEcAB proteins by controlling the availability of protein–protein interaction domains situated between the EF hands and the antibiotic biosynthesis monooxygenase domain. This review summarizes what is known about genomic organization, tissue expression, intracellular localization, interac

关键词： calcium EF hand mitochondria nervous system signal transduction