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Formation of Edge Crack in 1.4%Si Non-oriented Electrical Steel during Hot Rolling

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Journal of Iron and Steel Research International 2014年第2期21卷 269-274页

作者： Ai-hua chen Hai-rong GUO hua-long LI Toshihiko EMI Institute of Research of Iron and Steel Shasteel

Microstructure evolution, dynamic recrystallization, high temperature oxidation and hot ductility of 1.4 % Si non-oriented electrical steel sheets were investigated to reduce edge cracking. The causes of cracking were found to be coarse as-cast microstructure, grain boundary oxidation in reheating furnace, lack of dynamic recrystallization during hot rolling and increase of temperature, resulting in reduced hot ductility in strip edge region. Countermeas- ures against the edge crack are proposed accordingly. Lowering reheating temperature and reducing holding time re- duced oxidation and decarburization. Hot charging temperature was increased to decrease reheating temperature. And using an edger can refine microstructure in strip edge region. Finally, edge heater can be added to increase edge re- gion formability by inducing dynamic reerystallization and ductility by increasing temperature.

关键词： edge crack non-oriented electrical steel hot rolling

Theoretical prediction of the noble gas complexes HeAuF and NeAuF

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Science China Chemistry 2009年第11期52卷 1987-1990页

作者： chen rong ZHU hua XIE DaiQian YAN GuoSen School of Chemistry Sichuan UniversityChengdu 610064China State Key Laboratory of Biotherapy Sichuan UniversityChengdu 610064China Institute of Theoretical and Computational Chemistry Key Laboratory of Mesoscopic ChemistrySchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210093China

Ab initio calculations were carried out to investigate the structures and the stability of the noble gas complexes HeAuF and NeAuF through MP2 and CCSD(T) *** HeAuF was predicted to have a linear structure with weak He-Au covalent bonding,the distance of which is closer to the covalent limit in comparison with the corresponding van der Waals *** dissociation energy with respect to He + AuF was found to be 24 and 26 kJ·mol-1 at the CCSD(T)/basis set B and B' levels,***,similar calculations for NeAuF indicate that NeAuF is not a stable species.

关键词： HeAuF NeAuF structure stability

Studies on the binding of vinpocetine to human serum albumin by molecular spectroscopy and modeling

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Chinese Chemical Letters 2012年第5期23卷 599-602页

作者： hua Jiang rong rong chen Hong Cui Wang Han Lin Pu Bio-engineering Institute College of Life Science and TechnologyJinan UniversityGuangzhou 510632China

The interaction between vinpocetine（VPC） and human serum albumin（HSA） in physiological buffer（pH 7.40） was investigated by fluorescence,FT-IR,UV-vis absorption and molecular *** effectively quenched the intrinsic fluorescence of HSA via static *** binding site number n and apparent binding constant K_a,corresponding thermodynamic parametersΔG,ΔH andΔS at different temperatures were *** synchronous fluorescence and FT-IR spectra were used to investigate the structural change of HSA molecules with addition of *** modeling indicated that VPC could bind to the site I of HSA and hydrophobic interaction was the major acting force,which was in agreement with the binding mode study.

关键词： Vinpocetine Human serum albumin Fluorescence quenching Molecular modeling

Processes Leading to Second-Year Cooling of the 2010–12 La Ni?a Event,Diagnosed Using GODAS

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Advances in Atmospheric Sciences 2015年第3期32卷 424-438页

作者： FENG Licheng ZHANG rong-hua WANG Zhanggui chen Xingrong National Marine Environmental Forecasting Center State Oceanic Administration Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of Sciences Earth System Science Interdisciplinary Center (ESSIC) University of MarylandCollege ParkMaryland USA 20740

Isopycnal analyses were performed on the Global Ocean Data Assimilation System （GODAS） to determine the oceanic processes leading to so-called second-year cooling of the La Nina *** 2010-12,a horseshoe-like pattern was seen,connecting negative temperature anomalies off and on the Equator,with a dominant influence from the South *** the 2010 La Nina event,warm waters piled up at subsurface depths in the western tropical *** in early 2011,these warm subsurface anomalies propagated along the Equator toward the eastern basin,acting to reverse the sign of sea surface temperature （SST） anomalies （SSTAs） there and initiate a warm ***,throughout early 2011,pronounced negative anomalies persisted off the Equator in the subsurface depths of the South *** isopycnal surfaces outcropped in the central equatorial Pacific,negative anomalies from the subsurface spread upward along with mean circulation pathways,naturally initializing a cold *** the summer,a cold SSTA reappeared in the central basin,which subsequently strengthened due to the off-equatorial effects mostly in the South *** SSTAs acted to initiate local coupled air-sea interactions,generating atmospheric-oceanic anomalies that developed and evolved with the second-year cooling in the fall of ***,the cooling tendency in mid-2012 did not develop into another La Nina event,since the cold anomalies in the South Pacific were not strong *** analysis of the 2007-09 La Nina event revealed similar processes to the 2010-12 La Nina event.

关键词： La Ni(n)a second-year cooling off-equatorial effects isopycnal analyses circulation pathways GODAS

Arc characteristics of submerged arc welding with stainless steel wire

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International Journal of Minerals,Metallurgy and Materials 2014年第8期21卷 772-778页

作者： Ke Li Zhi-sheng Wu Cui-rong Liu Feng-hua chen College of Materials Science and Engineering Taiyuan University of Science and Technology

The arc characteristics of submerged arc welding （SAW） with stainless steel wire were studied by using Analysator Hannover （AH）. The tests were carded out under the same preset arc voltage combined with different welding currents. By comparing the probability density distribution （PDD） curves of arc voltage and welding current, the changes were analyzed, the metal transfer mode in SAW was deduced, and the characteristics of a stable arc were summarized. The analysis results show that, with an increase of welding parameters, the short-circuiting peak in the PDD curves of arc voltage decreases gradually until it disappears, and the dominant metal transfer mode changes from flux-wall guided transfer to projected transfer and then to streaming transfer. Moreover, when the PDD curves of arc voltage are both unimodal and generally symmetrical, the greater the peak probability and the smaller the peak span, the more stable the arc becomes.

关键词： submerged arc welding electric arc characteristics stainless steel wire metal transfer

The 2020–2021 prolonged La Niña evolution in the tropical Pacific

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Science China Earth Sciences 2022年第12期65卷 2248-2266页

作者： Chuan GAO Maonan chen Lu ZHOU Licheng FENG rong-hua ZHANG Key Laboratory of Ocean Circulation and Waves Institute of OceanologyCenter for Ocean Mega-ScienceChinese Academy of SciencesQingdao 266071China Laoshan Laboratory Qingdao 266237China School of Marine Sciences Nanjing University of Information Science and TechnologyNanjing 210044China University of Chinese Academy of Sciences Beijing 100029China Center for Excellence in Quaternary Science and Global Change Chinese Academy of SciencesXi’an 710061China National Marine Environmental Forecasting Center Ministry of Natural ResourcesBeijing 100081China

The evolution of sea surface temperature(SST)in the tropical Pacific during 2020–2021 indicates a second-year cooling in late 2021 again,following the 2020 La Niña *** physical explanations are still lacking,and there is a clear need to understand the underlying processes *** data and reanalysis products are used to describe the characteristics and spatiotemporal evolution of upper-ocean thermal anomalies;an intermediate coupled model(ICM)is also used to perform numerical experiments to confirm these observation-based *** evolution of subsurface thermal anomalies is critically important to that of SST in the central-eastern equatorial Pacific;the effects of the former on the latter can be well represented by the temperature of subsurface waters entrained into the mixed layer(Te),a field that reflects a subsurface forcing on *** SST evolution is sensitively dependent on the intensities of the local effect associated with Te anomalies in the eastern equatorial Pacific and the remote effect associated with subsurface anomalies from the western *** early-and mid-2021,a competition was present between these local and remote effects associated with Te *** the remote warming effect dominates the local cooling effect,the cold SST condition in the east is likely to turn into neutral and warm conditions;otherwise,it tends to *** addition,the negative Te anomalies were sustained and enhanced by off-equatorial processes due to equatorial wave reflections at the eastern boundary associated with the 2020 La Niña *** SST evolution in mid-2021 corresponded to a situation in which the warming effect associated with positive subsurface thermal anomalies from the west were not strong enough to counteract the local cooling effect associated with negative anomalies in the *** due course,cold SST anomalies in the east developed again and the second-year cooling reoccurred in late 2021,with a turning point in

关键词： Prolonged La Niña evolution in 2020-2021 Subsurface effect on SST Remote and local processes Modeling experiments

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Influence of Self-excited Vibrating Cavity Structure on Droplet Diameter Characteristics of Twin-fluid Nozzle

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Chinese Journal of Mechanical Engineering 2018年第4期31卷 192-201页

作者： Bo chen Dian-rong Gao Shao-Feng Wu Jian-hua Zhao School of Mechanical Engineering Yanshan University School of Mechanical Engineering Hangzhou Dianzi University State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang University

It is a great challenge to find effective atomizing technology for reducing industrial pollution; the twin-fluid atomizing nozzle has drawn great attention in this field recently. Current studies on twin-fluid nozzles mainly focus on droplet breakup and single droplet characteristics. Research relating to the influences of structural parameters on the droplet diameter characteristics in the flow field is scarcely available. In this paper, the influence of a self-excited vibrating cavity structure on droplet diameter characteristics was investigated. Twin-fluid atomizing tests were performed by a self-built open atomizing test bench, which was based on a phase Doppler particle analyzer(PDPA). The atomizing flow field of the twin-fluid nozzle with a self-excited vibrating cavity and its absence were tested and analyzed. Then the atomizing flow field of the twin-fluid nozzle with different self-excited vibrating cavity structures was *** experimental results show that the structural parameters of the self-excited vibrating cavity had a great effect on the breakup of large droplets. The Sauter mean diameter(SMD) increased with the increase of orifice diameter or orifice depth. Moreover, a smaller orifice diameter or orifice depth was beneficial to enhancing the turbulence around the outlet of nozzle and decreasing the SMD. The atomizing performance was better when the orifice diameter was2.0 mm or the orifice depth was 1.5 mm. Furthermore, the SMD increased first and then decreased with the increase of the distance between the nozzle outlet and self-excited vibrating cavity, and the SMD of more than half the atomizing flow field was under 35 μm when the distance was 5.0 mm. In addition, with the increase of axial and radial distance from the nozzle outlet, the SMD and arithmetic mean diameter(AMD) tend to increase. The research results provide some design parameters for the twin-fluid nozzle, and the experimental results could serve as a beneficial suppleme

关键词： Atomizing nozzle Twin-fluid Sauter mean diameter Arithmetic mean diameter Self-excited vibrating cavity Phase Doppler particle analyzer

Differential Polymorphic Transformation Behavior of Polybutene-1 with Multiple Isotactic Sequences

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Chinese Journal of Polymer Science 2020年第2期38卷 164-173,I0007页

作者： Ya-Ping Ma Wei-Ping Zheng chen-Guang Liu hua-Feng Shao hua-rong Nie Ai-hua He Shandong Provincial Key Laboratory of Olefin Catalysis and Polymerization Key Laboratory of Rubber-Plastics (Ministry of Education) Qingdao University of Science and Technology

For the solid-solid transformation from form Ⅱ to form Ⅰ of isotactic polybutene-1(iPB),the temperature dependence of form Ⅰ nucleation and growth was deemed to control the transformation ***,the relationship between formⅠ formation and form Ⅱ disappearance in the transformation process is not *** this work,the spontaneous crystal transformation from form Ⅱ to Ⅰ of iPB with 81 mol%mmmm sequence concentration is studied firstly by tracking the two processes,the decay of form Ⅱ and the yielding of form Ⅰ in a wide range of temperature spanning from 0℃ to 50℃ and in a long transformation time ranging from 5 min to 65 days with in situ FTIR and *** the literature reports,the decay rate of form Ⅱ is firstly found to be lower than the yielding rate of form Ⅰ at all studied temperatures,especially at low transition *** is attributed to the amorphous chains which locate near crystal lamella participating into the nucleation of form Ⅱ.The regular chain folding and growth of i PB form Ⅰ from amorphous chains containing short isotactic sequences also lead to an increase in crystallinity of form Ⅰ compared with that of initial form Ⅱ crystallized at 60℃.An increase in the annealing temperature results in decrease in crystallinity and increase in lamellae thickness of i PB formⅠ.

关键词： Polybutene-1 Polymorphic transformation Isotactic sequence Crystallinity Lamellae thickness

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辣椒种质疫病抗性鉴定及SRAP分析

江西农业大学学报 2016年第6期38卷 1049-1055页

作者：方荣周坤华陈学军马辉刚吴茵何烈干袁欣捷石博江西省农业科学院蔬菜花卉研究所江西南昌330200 江西省农业科学院植物保护研究所江西南昌330200 江西农业大学农学院江西南昌330045

为科学评价辣椒种质资源,应用苗期人工接种鉴定方法和SRAP技术,对204份辣椒种质进行疫病抗性评价和遗传多样性分析。筛选出高抗和抗性材料各8份、中抗材料16份,感病材料172份;抗病材料占供试种质数的比例为15.69%,且主要来自我国南方地... 详细信息

为科学评价辣椒种质资源,应用苗期人工接种鉴定方法和SRAP技术,对204份辣椒种质进行疫病抗性评价和遗传多样性分析。筛选出高抗和抗性材料各8份、中抗材料16份,感病材料172份;抗病材料占供试种质数的比例为15.69%,且主要来自我国南方地区。SRAP分析结果表明,20条引物组合共扩增出585条带,平均每个引物扩增出29.25条,多态性位点比例82.91%。204份材料两两不同种质间Jaccard相似系数0.413~0.996,平均为0.788。通过UPGMA聚类分析,以相似系数0.700为阀值,将204份种质分为7类,有25份抗病材料分布在第Ⅴ类和第Ⅵ类,占全部抗病材料的78.10%。

关键词：辣椒疫病抗性 SRAP