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Magneto-electric behaviors of La_(0.67-x)Nd_(x)Sr_(0.33)MnO_(3) system

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Rare Metals 2022年第4期41卷 1357-1363页

作者： Ning Liu Teng guo guo-Qing Yan Guang Zhu Huan-yin guo College of Machinery and Automobile Engineering Anhui Polytechnic UniversityWuhu 241000China Anhui Key Laboratory of Spin Electron and Nanomaterials(Cultivating Base) Suzhou CollegeSuzhou 234000China College of Chemistry and Materials Engineering Anhui Science and Technology UniversityFengyang 233100China National Laboratory of Solid State Microstructures Nanjing UniversityNanjing 210093China

The polycrystalline samples La_(0.67-x)Nd_(x)Sr_(0.33)MnO_(3)(x=0.1,0.2,0.3,0.4,0.5)were prepared by standard solid-state reaction method,and the M–T curves,electron spin resonance(ESR)curves,infrared spectra,Raman spectra,ρ–T curves and MR–T curves of the compounds above were *** results show that single phase can be obtained at different Nd substitution ratios,and with the increase in Nd doping,the magnetic structure of the system transforms from long-range ferro-magnetic order to spin cluster glass state and antiferro-magnetic state;and the phase separation appears in the samples with x=0.3 and *** transport property exhibits variation with the increase in Nd doping,and the electric behavior of the sample transforms(from metal state to insulator–metal transition,and then insulator state)is accompanied by colossal magnetoresistance(CMR)effect,which can be attributed to the different couplings of sublattices induced by Nd doping and the interface tun-neling effect related to the spin.

关键词： Magnetic structure Transport behavior Sublattice Interface tunneling effect

Realistic face modeling based on multiple deformations

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The Journal of China Universities of Posts and Telecommunications 2007年第4期14卷 110-117页

作者： GONG Xun WANG guo-yin School of Information Science and Technology Southwest Jiaotong University Chengdu 610031 China Institute of Computer Science and Technology Chongqing University ofPosts and Telecommunications Chongqing 400065 China

On the basis of the assumption that the human face belongs to a linear class, a multiple-deformation model is proposed to recover face shape from a few points on a single 2D image. Compared to the conventional methods, this study has the following advantages. First, the proposed modified 3D sparse deforming model is a noniterative approach that can compute global translation efficiently and accurately. Subsequently, the overfitting problem can be alleviated based on the proposed multiple deformation model. Finally, by keeping the main features, the texture generated is realistic. The comparison results show that this novel method outperforms the existing methods by using ground truth data and that realistic 3D faces can be recovered efficiently from a single photograph.

关键词： face reconstruction, deforming model,texture synthesis

TZ Lyrae:an Algol-type Eclipsing Binary with Mass Transfer

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Chinese Journal of Astronomy and Astrophysics 2007年第2期7卷 258-264页

作者： Yuan-Gui Yang Xin-guo yin Physics Department of Huaibei Coal Industry Teachers College Huaibei 235000

We present a detailed investigation of the Algol-type binary TZ Lyrae, based on 55 light minimum timings spanning 90 years. It is found that the orbital period shows a long-term increase with a cyclic variation superimposed. The rate of the secular increase is dP/dt = ＋7.18 × 10^-8d yr^-1, indicating that a mass transfer from the less massive component to the more massive one at a rate of dra = ＋2.21 × 10^-8M⊙ yr^-1. The cyclic component, with a period of P3 = 45.5 yr and an amplitude of A = 0.^d0040, may be interpreted as either the light-time effect in the presence of a third body or magnetic activity cycles in the components. Using the latest version Wilson-Devinney code, a revised photometric solution was deduced from B and V observations. The results show that TZ Lyr is an Algol-type eclipsing binary with a mass ratio of q = 0.297±0.003）. The semidetached configuration with a lobe-filling secondary suggests a mass transfer from the secondary to the primary, which is in agreement with the long-term period increase of the binary system.

关键词： stars binaries close - stars binaries eclipsing - stars individual TZ Lyrae

Asymmetry in interface and bending property of Al/Cu/Al bimetallic laminates

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Rare Metals 2014年第5期33卷 556-562页

作者： Xiao-Bing Li guo-yin Zu Ping Wang School of Materials and Metallurgy Northeastern University

This work was aimed to study the interfacial microstructures and three-point bending properties of Al/Cu/Al bimetallic laminates produced by the asymmetrical roll bonding and annealing. It is found that the microstructure and bonding strength of the Al/Cu interface are different with those of the Cu/Al interface. The interfacial microstructure of Cu/Al interface is improved due to the large interfacial plastic deformation caused by the different rotation speeds of roll in the asymmetrical roll bonding process. The bonding strength between Al and Cu layer can be enhanced by the moderate atomic diffusion, but is dramatically depressed by the formation of intermetallic compounds in the *** bending strength of bimetallic laminates is enhanced when the Cu/Al interface is loaded in tension because of the improvement of stress transition and damping by the Cu/Al interface during the three-point bending deformation. The bending fracture reveals that the interfacial cracks can be inhibited from the restricted stress concentration in the improved Cu/Al interface.

关键词： Layered structures Bending test Interface Shear deformation

Fault Diagnosis and Separation for a Distributed Rotary-laser Scanning System

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Journal of Geodesy and Geoinformation Science 2023年第4期6卷 70-78页

作者： Siyang guo yin guo Shibin yin Hongbo XIE Jigui ZHU Isvision(Hangzhou)Technology Company Limited Hangzhou 310000China School of Precision Instrument and Opto-electronics Engineering Tianjin UniversityTianjin 300072China

The wMPS is a laser-based measurement system used for large scale ***,it is susceptible to external factors such as vibrations,which can lead to unreliable *** paper presents a fault diagnosis and separation method which can counter this *** begin with,the paper uses simple models to explain the fault diagnosis and separation *** methods are then mathematically derived using statistical analysis and the principles of the wMPS.A comprehensive solution for fault diagnosis and separation is proposed,considering the characteristics of the *** effectiveness of this solution is verified through experimental *** can be concluded that this approach can detect and separate false observations,thereby enhancing the reliability of the wMPS.

关键词： rotary-laser scanning measurement system least square method fault diagnosis fault separation

Effects of macrosegregation on mechanical and tribological properties of squeeze casting immiscible bearing alloys

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China Foundry 2023年第5期20卷 443-451页

作者： Ming Xu Yan-guo yin Cong-min Li guo-tao Zhang Cong-chong Duan Institute of Tribology School of Mechanical EngineeringHefei University of TechnologyHefei 230002China School of Mechanical Engineering Anhui University of TechnologyMaanshan 243002AnhuiChina Anhui Yihui New Material Co. Ltd.Hefei 230000China

The macrosegregation behaviors of Al-Sn-Cu ternary immiscible alloy castings and their effects on mechanical and tribological properties were *** results demonstrate that Sn and Cu segregate in the casting simultaneously,and the mass fraction of the two elements has a"U"shaped ***,positive and negative segregation occur in the casting,with positive segregation appearing on the top and lower surfaces and negative segregation on the remaining surfaces,with the 1/2 surface(hot node location)having the highest degree of negative ***,the results of Vickers hardness,tensile strength,and elongation show that Sn and Cu cooperatively affect the mechanical properties of *** higher the mass fraction of Sn and Cu elements,the higher the hardness,the greater the tensile strength,and the better the *** findings of the step-by-step loading tests demonstrate that the segregation of Sn and Cu significantly impacts the tribological characteristics of the *** higher the mass fraction of Sn and Cu on the sample surface,the better the tribological characteristics.

关键词： squeeze casting Al-Sn-Cu macrosegregation mechanical properties tribological property

Effect of cerium on microstructure,texture and properties of ultrahigh-purity copper

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Journal of Rare Earths 2024年第1期42卷 220-227,I0008页

作者： Yunxiao Hua Haitao Liu Kexing Song Jiangwei Wang yin'gang guo Jing Tian Huiwen guo Provincial and Ministerial Co-construction of Collaborative Innovation Center for Non-ferrous Metal New Materials and Advanced Processing Technology School of Materials Science and EngineeringHenan University of Science and TechnologyLuoyang471023China Henan Academy of Sciences Zhengzhou450000China Center of Electron Microscopy and State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou310027China Henan Zhongyuan Gold Smelter Co. Ltd.Sanmenxia472100China Chinalco Luoyang Copper Processing Co. Ltd.Luoyang471039China

The effects of Ce addition(310 ppm and 1500 ppm)on the microstructure,texture and properties of ultrahigh-purity copper(99.99999%)were systematically studied using scanning electron microscopy(SEM),transmission electron microscopy(TEM)and electron backscattered diffraction(EBSD)analyses,combined with the microhardness and conductivity *** the microstructure of the as-cast and as-extruded samples,the addition of Ce refines the grain size of the ultrahigh-purity copper and the refinement effect of 310Ce alloy is greater than that of 1500Ce *** is due to the stronger compone nt supercooling and the accele rated recrystallization caused by lower Ce co *** addition,Ce can react with Cu to form the Cu-Ce eutectic phases,which are deformable during the hot ***,the added Ce can weaken the texture,showing a variation of brass recrystallization(BR),rotated cube,copper and S texture components,which depends on the recrystallization,the particle stimulated nucleation(PSN)as well as the stacking fault energy(SFE).Most remarkably,the introduction of Ce enhances the hardness of the ultrahigh-purity copper without obviously reducing its *** major{111}orientations and the stress distributions are responsible for such a superior conductivity of the Ce-containing alloys.

关键词： Ce addition Grain refinement Texture Conductivity Ultrahigh-purity copper Rare earths

A comparative study on Sn macrosegregation behavior of ternary Al-Sn-Cu alloys prepared by gravity casting and squeeze casting

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China Foundry 2023年第1期20卷 63-70页

作者： Ming Xu Yan-guo yin Cong-min Li Cong-chong Duan College of Mechanical Engineering Hefei University of TechnologyHefei 230002China Anhui Yihui New Materials Co. Ltd.Hefei 230000China

A comprehensive study on Sn macrosegregation behavior in ternary Al-Sn-Cu alloys was carried out by comparative analysis between gravity casting and squeeze casting *** microstructure and Sn distribution of the castings were characterized by metallography,scanning electron microscopy(SEM),energy-dispersive X-ray(EDX)spectroscopy,and a direct reading *** show that there are obvious differences in Sn morphology between gravity casting and squeeze casting *** squeeze casting condition,the grain size of the casting is smaller and the distribution ofβ(Sn)is *** effectively reduces the segregation of triangular grain boundary as well as the segregation of *** segregation types of Sn in gravity casting and squeeze casting samples are obviously *** upper surfaces of gravity casting samples show severe negative segregation,while all the lower surfaces have positive *** with gravity casting,squeeze casting solidifies under isostatic *** to the direct contact between the upper surface of the casting and the mold,the casting solidifies faster under higher undercooling degree and ***,the uniform distribution of Sn reduces the segregation phenomenon on the surface of the casting.

关键词： ternary Al-Sn-Cu alloy squeeze casting macrosegregation mechanism

Deformation behavior and crack propagation on interface of Al/Cu laminated composites in uniaxial tensile test

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Rare Metals 2020年第3期39卷 296-303页

作者： Xiao-Bing Li Yuan Yang Yu-Song Xu guo-yin Zu School of Metallurgical and Materials Engineering Jiangsu University of Science and Technology(Zhangjiagang)Suzhou215600China School of Materials Science and Engineering Northeastern UniversityShenyang110819China

The microstructural characterization and uniaxial tensile tests of Al/Cu laminated composites were taken to investigate the interface effect and fracture process of the *** electron microscopic graphs before and after tensile test were used to evaluate the fracture *** results show that the fracture surfaces of laminated composites mainly present brittle failure characteristics,accompanied with several dimples on the matrixes and a few tearing on the *** generally initiate from the interfacial interlayer and variously propagate depending on the interfacial *** is found that Cu/Al interface with enhanced bonding strength generally hinders the propagation of interlayer cracks,while the interface with weak bonding delaminates by the cracks propagation through the interfacial *** additional shear stress on the interface between Cu and Al layers due to their different tensile ductilities aggravates the interfacial propagation of *** local plastic deformation of individual matrix layer then occurs after cracks coalesce and failure in the ***,the strong bonding interface and matching properties between individual matrix layers are required to improve the fracture performance of Al/Cu laminated composites.

关键词： Laminated composite Interface Failure analysis Bonding Electron microscopy