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Automotive Innovation 2020年第3期3卷 242-249页

作者： Yunwu Ma Sizhe Niu he shan Yongbing Li Ninshu Ma shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghaiChina State Key Laboratory of Mechanical System and Vibration School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghaiChina Joining and Welding Research Institute Osaka UniversityOsakaJapan

Self-piercing riveting(SPR)is a mature method to join dissimilar materials in vehicle body *** self-piercing riveting(F-SPR)is a newly developed technology for joining low-ductility materials by combining SPR and friction stir spot welding *** this paper,the SPR and F-SPR were employed to join AA6061-T6 aluminum alloy and AZ31B magnesium *** two processes were studied in parallel to investigate the effects of stack orientation on riveting force,macro-geomet-rical features,hardness distributions,and mechanical performance of the *** results indicate that both processes exhibit a better overall joint quality by riveting from AZ31B to *** cracking in the Mg sheet is produced when riveting from AA6061-T6 to AZ31B in the case of SPR,and the cracking is inhibited with the thermal softening effect by friction heat in the case of *** F-SPR process requires approximately one-third of the riveting forces of the SPR process but exhibits a maximum of 45.4%and 59.1%higher tensile-shear strength for the stack orientation with AZ31B on top of AA6061-T6 and the opposite direction,respectively,than those of the SPR *** stack orientation of riveting from AZ31B to AA6061-T6 renders better cross-section quality and higher tensile-shear strength and is recommended for both processes.

关键词： Self-piercing riveting Friction self-piercing riveting Aluminum alloy Magnesium alloy Stack orientation

Combined strengthening mechanism of solid-state bonding and mechanical interlocking in friction self-piercing riveted AA7075-T6 aluminum alloy joints

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Journal of Materials Science & Technology 2022年第10期105卷 109-121页

作者： Yunwu Ma Bingxin Yang shanqing Hu he shan Peihao Geng Yongbing Li Ninshu Ma shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Mechanical System and Vibration School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China Joining and Welding Research Institute Osaka UniversityOsaka 567-0047Japan

A recently developed friction self-piercing riveting(F-SPR)technique based on the combination of fric-tion stir processing and riveting has been reported to possess both solid-state bonding and mechanical fastening ***,there is still a lack of quantitative understanding of the hybrid en-hancement mechanism,hindering its engineering *** fill in this gap,the current research investigated the microstructure evolution,microhardness distribution,and miniature-tensile performance of the aluminum alloy AA7075-T6 F-SPR joints by *** accurate numerical simulation model was established to quantitatively evaluate the individual contributions of microstructure,local bonding strength,and macro interlocking to the performance of the joint,which could well explain the experi-mental *** was found that due to the friction stirring of the rivet,solid-state bonding driven by dynamic recrystallization is realized between the trapped aluminum in the rivet cavity and the bottom aluminum *** solid-state bonding zone has 75%yield strength,81%ultimate tensile strength,and 106%elongation compared to the base *** solid-state bonding enables the internal interlock-ing between the trapped aluminum and the rivet to withstand the additional load,which forms a novel dual-interlock fastening mechanism and increases the peak cross-tension force by 14.3%compared to the single-interlock joint.

关键词： Combined strengthening Friction self-piercing riveting Miniature tensile test Solid-state joining Dual-interlocking Numerical simulation

A Comparative Study of Friction Self-Piercing Riveting and Self-Piercing Riveting of Aluminum Alloy AA5182-O

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Engineering 2021年第12期7卷 1741-1750页

作者： Yunwu Ma he shan Sizhe Niu Yongbing Li Zhongqin Lin Ninshu Ma shanghai Key Laboratory of Digital Manufacture for Thin-Walled Structures School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Mechanical System and Vibration School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China Joining and Welding Research Institute Osaka UniversityOsaka 567-0047Japan

In this paper,self-piercing riveting(SPR)and friction self-piercing riveting(F-SPR)processes were employed to join aluminum alloy AA5182-O *** studies were carried out to compare the two processes in terms of joint macrogeometry,tooling force,microhardness,quasi-static mechanical performance,and fatigue *** results indicate that the F-SPR process formed both rivet–sheet interlocking and sheet–sheet solid-state bonding,whereas the SPR process only contained rivet–sheet *** the same rivet flaring,the F-SPR process required 63%less tooling force than the SPR process because of the softening effect of frictional heat and the lower rivet hardness of *** decrease in the switch depth of the F-SPR resulted in more hardening of the aluminum alloy surrounding the *** higher hardness of aluminum and formation of solid-state bonding enhanced the F-SPR joint stiffness under lap-shear loading,which contributed to the higher quasi-static lap-shear strength and longer fatigue life compared to those of the SPR joints.

关键词： Self-piercing riveting Friction self-piercing riveting Mechanical joining Quasi-static strength Fatigue

Preparation of Gd Co alloy in dimethylsulfoxide by electrodeposition method

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中国有色金属学会会刊：英文版 1999年第3期9卷 638-640页

作者： Tong Yexiang(童叶翔) Liu Guankun(刘冠昆) he shan(何山) Wang Yu(王宇) Zhongshan Univ Sch Chem & Chem Engn Guangzhou 510275 Peoples R China

Electrodeposition of Gd Co alloy film from dimethylsulfoxide (DMSO) electrolyte solutions has been investigated using cyclic voltammogram and potentiostatic technique. Potentiostatic depositions between -1.20 V and -2.70 V were applied to uncomplexed and complexed solution. The deposits obtained at potentials within -2.30～-2.70 V from complexed solutions are silver gray smooth films.

关键词： Gd Co alloy electrodeposition dimethylsulfoxide

Seasonal variation of gut Cyanophyta contents and liver GST expression of mud carp(Cirrhina molitorella) and Nile tilapia(Oreochromis niloticus) in the tropical Xiangang Reservoir(Huizhou,China)

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Chinese Science Bulletin 2012年第6期57卷 615-622页

作者： CheNG WeiXuan LIANG XuFang SheN Dan ZHOU Qiong he Yan he shan LI GuangYu College of Fisheries Huazhong Agricultural UniversityWuhan 430070China

Liver glutathione S-transferase(GST) plays a major role in the detoxification of microcystins(MCs) via conjugation to glutathione(GSH).We evaluated the relationship between seasonal variation in fish gut contents and the expression of GST isoforms in mud carp(Cirrhina molitorella) and Nile tilapia(Oreochromis niloticus).We quantified the abundance and diversity of plankton in the water column and foregut of mud carp and Nile tilapia in the tropical Xiangang Reservoir between October 2007 and July *** mRNA expression of 7 liver GST isoforms was determined by real-time *** gut contents of both species were dependent on the amount and type of phytoplankton and zooplankton in the *** expression of liver GST genes in Nile tilapia and mud carp was positively and negatively correlated,respectively,with the abundance of toxic cyanobacteria in the *** expression of liver GST mRNA was correlated to the abundance of toxic cyanobacteria in the gut contents of both species,suggesting that mRNA expression of GST isoforms could be used as a biomarker in Nile tilapia and mud carp to monitor cyanobacteria blooms in reservoirs.

关键词：尼罗罗非鱼蓝藻水华肠内容物鲮鱼水库季节变化热带谷胱甘肽S

Static recrystallization behaviors and mechanisms of 7Mo super-austenitic stainless steel with undissolved sigma precipitates during double-stage hot deformation

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Journal of Iron and Steel Research International 2024年第2期31卷 475-487页

作者： Shi-guang Xu Jin-shan he Run-ze Zhang Fu-cheng Zhang Xi-tao Wang Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing100083China State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao066004HebeiChina shandong Provincial Key Laboratory for High Strength Lightweight Metallic Materials Advanced Materials InstituteQilu University of Technology(Shandong Academy of Science)Jinan250353ShandongChina

Static recrystallization(SRX)behaviors and corresponding recrystallization mechanisms of 7Mo super-austenitic stainless steel were studied under different deformation *** order of influence of deformation parameters on static recrystallization behaviors,from high to low,is followed by temperature,first-stage strain and strain ***,the effect of holding time on static recrystallization behaviors is significantly controlled by *** addition,with the increase in temperature from 1000 to 1200°C,the static recrystallization mechanism evolves from discontinuous static recrystallization and continuous static recrystallization(cSRX)to metadynamic recrystallization and cSRX,and finally to *** cSRX exists at all *** is because high stacking fault energy(56 mJ m−2)promotes the movement of dislocations,making the deformation mechanism of this steel is dominated by planar slip of *** undissolved sigma precipitates promote static recrystallization through particle-stimulated ***,small strain-induced precipitates at grain boundaries hinder the nucleation of conventional SRX and the growth of recrystallized grains,while the hindering effect decreases with the increase in temperature.

关键词： 7Mo super-austenitic stainless steel Double-stage hot deformation Conventional static recrystallization Metadynamic recrystallization Strain-induced precipitation

Entanglement in Anisotropic heisenberg XYZ Chain with Inhomogeneous Magnetic Field

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Communications in Theoretical Physics 2007年第3X期48卷 453-456页

作者： YANG Guo-Hui GAO Wen-Bin ZHOU Ling SONG he-shan Department of Physics Dalian University of Technology Dalian 116023 China

The thermal entanglement of a two-qubit anisotropic heisenberg XYZ chain under an inhomogeneous magnetic field b is studied. It is shown that when inhomogeneity is increased to a certain value, the entanglement can exhibit a larger revival than that of less values of b. The property is both true for zero temperature and a finite temperature. The results also show that the entanglement and threshold temperature can be increased by increasing inhomogeneous external magnetic field.

关键词： heisenberg model entanglement inhomogeneous magnetic field

Effects of Different Time-Dependent Couplings on Two-Atom Entanglement

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Communications in Theoretical Physics 2007年第5期47卷 909-912页

作者： ZHOU Ling GAO Wen-Bin YANG Guo-Hui SONG he-shan Department of Physics Dalian University of Technology Dalian 116024 China

The effects of different time-independent and time-dependent couplings on two-atom entanglement are studied. The results show that the effects depend on the initial state. For the initial state ｜eeO〉, it is found that different time-independent couplings make the case without entanglement exhibit entanglement, and time-dependent couplings turn the irregular entanglement regions into regular one. Under the case of decay, for the initial state ｜eg0〉, the different time-dependent couplings have disbenefit.

关键词： different time-dependent couplings entanglement quantum jump approach

Age,growth and reproduction of Sarcocheilichthys nigripinnis from the Qingyi Stream in the Huangshan Mountains

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Zoological Research 2012年第3期33卷 25-31页

作者： Yunzhi YAN Yinsheng XU Ling CHU shan he Yifeng CheN College of Life sciences Anhui Normal UniversityProvincial Key Laboratory of Biotic Environment and Ecological Safety in Anhui ProvinceWuhu 241000China Institute of Hydrobiology Chinese Academy of SciencesWuhan 430072China

Identifying the life-history strategies of fish and their associations with the surrounding environment is the basic foundation in the conservation and sustainable utilization of fish *** examined the age,growth,and reproduction of Sarcocheilichthys nigripinnis using 352 specimens collected monthly from May 2009 to April 2010 in the Qingyi *** found the sex ratio of this study population was 0.58:1(female:male),significantly different from expected 1:*** and males both comprised four age *** annuli on the scales were formed during February and *** obvious between-sex difference was observed in length-weight and length-scale-radius *** total length in back-calculation significantly increased with age for both sexes,but did not differ significantly at each age between the two *** inflection point was observed in the growth curves given by the von Bertalanffy growth function for total *** this inflection point,fish were 3.95 *** sexes reach their 50%sex maturity at age 2,when females and males were 94.7 mm and 103.0 mm total *** temporal pattern of the gonado-somatic index corresponded to a spawning period that occurred from April through *** non-synchronicity of egg diameter in each mature ovary during the breeding period suggested these fish may be batch *** absolute fecundity increased significantly with total length and weight,whereas no significant correlation was observed between the relative fecundity and body size.

关键词： Sarcocheilichthys nigripinnis Age structure Annulus formation Sexual maturity Spawning period Reproductive investment

Probing molecular orientation at bulk heterojunctions by polarization-selective transient absorption spectroscopy

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Science China Chemistry 2021年第9期64卷 1569-1576页

作者： Cankun Zhang Yuzhe Zhang Zhiye Wang Yuming Su Zhixiang Wei Jianhui Hou shan he Kaifeng Wu Chang he Jianqi Zhang Cheng Wang State Key Laboratory for Physical Chemistry of Solid Surfaces iChEMCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen361005China Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM) FuzhouChina CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanosciecneNational Center for Nanoscience and TechnologyBeijing100190China State Key Laboratory of Polymer Physics and Chemistry Institute of ChemistryChinese Academy of SciencesBeijing100190China State Key Laboratory of Molecular Reaction Dynamics and Dynamics Research Center for Energy and Environmental Materials Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian116023China

A bulk heterojunction in organic solar cells is where charge separation and recombination *** orientation at the interface is one of the key factors that dictate solar cell *** X-ray scattering-based methods can determine donor/acceptor domain orientations between an anisotropic phase and an isotropic fullerene-based phase,the rise of nonfullerene solar cells presents a new challenge in delineating local molecular directions at the interface between two anisotropic donor/acceptor ***,we determine interfacial molecular orientations of three high-efficiency small molecule solar cells(ZR1:Y6,B1:BO-4 Cl,and BTR:BO-4 Cl)using polarization-selective transient absorption *** polarization anisotropy of charge separation dynamics indicates an angle of~90°between ZR1 and Y6 molecules at the interface,an angle close to 0°between B1 and BO-4 Cl,and random orientations between BTR and BO-4 *** observations provide complementary information to X-ray scattering measurements and highlight polarization-selective transient absorption spectroscopy as a tool to probe interfacial structure and dynamics of key photophysical steps in energy conversion.

关键词： polarization-selective transient absorption spectroscopy bulk heterojunction organic solar cell molecular orientation