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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

Restarted Full Orthogonalization Method with Deflation for Shifted Linear Systems

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Numerical Mathematics(Theory,Methods and Applications) 2014年第3期7卷 399-412页

作者： Jun-Feng yin guo-Jian yin Department of Mathematics Tongji University1239 Siping RoadShanghai 200092P.R.China Department of Mathematics The Chinese University of Hong KongShatinNTHong Kong

In this paper,we study shifted restated full orthogonalization method with deflation for simultaneously solving a number of shifted systems of linear *** analysis shows that with the deflation technique,the new residual of shifted restarted FOM is still collinear with each ***,the new approach can solve the shifted systems simultaneously based on the same Krylov *** experiments show that the deflation technique can significantly improve the convergence performance of shifted restarted FOM.

关键词： Shifted linear systems full orthogonalization method restarted Arnoldi process deflation collinear

Coupling mechanism of multi-force interactions in the myosin molecular motor

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Chinese Science Bulletin 2010年第31期55卷 3538-3544页

作者： guo Zhao yin YueHong State Key Laboratory of Mechanism System and Vibration Institute of Robotics Shanghai Jiao Tong University Shanghai 200240 China

The dynamics of the myosin molecular motor as it binds to actin filaments during muscle contraction are still not clearly *** this paper,we focus on the coupling mechanism of multi-force interactions in the myosin molecule during its interaction with *** forces include the electrostatic force,the van der Waals force and the Casimir force in molecular dynamic simulations of the molecules in solvent with thermal *** on the Hamaker approach,van der Waals and Casimir potentials and forces are calculated between myosin and *** have developed a Monte Carlo method to simulate the dynamic activity of the molecular *** have shown that because of the retardation effect,the van der Waals force falls into the Casimir force when the distance between the surfaces is larger than 3 *** the distance is smaller than 3 nm,the electrostatic force and the van der Waals force increase until the myosin becomes attached to the *** the distances studied in the present work,the electrostatic force dominates the attractive *** calculations are in good agreement with recently reported experimental results.

关键词：肌球蛋白分子马达相互作用耦合机制分子动力学模拟 Casimir力肌动蛋白范德华力

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

New Approach for Measured Surface Localization Based on Umbilical Points

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Chinese Journal of Mechanical Engineering 2017年第5期30卷 1203-1215页

作者： Xiao-Ping Xiao Ming yin Liang Heng guo-Fu yin Zi-Sheng Li School of Manufacturing Science and Engineering Sichuan University Center of Engineering and Technology Southwest University of Science and Technology School of Manufacturing Science and Engineering Southwest University of Science and Technology

Measured surface localization （MSL） is one of the key essentials for the assessment of form error in pre- cision manufacturing. Currently, the researches on MSL have focused on the corresponding relation search between two surfaces, the performance improvement of localization algorithms and the uncertainty analysis of localization. However, low efficiency, limitation of localization algo- rithms and mismatch of multiple similarities of feature points with no prior are the common disadvantages for MSL. In order to match feature points quickly and fulfill MSL efficiently, this paper presents a new localization approach for measured surfaces by extracting the generic umbilics and estimating their single complex variables, describing the match methods of ambiguous relation at umbilics, presenting the initial localization process of one pair matched points, refining MSL on the basis of obtained closet points for some measured points by the improvement directed projection method. In addition, the proposed algorithm is simulated in two different types of surfaces,two different localization types and multiple similar sur- faces, also tested with the part of B-spline surface machined and bottle mould with no knowledge, finally the initial and accurate rigid body transformation matrix, localization errors between two surfaces and execution time are got. The experimental results show that the pro- posed method is feasible, more accurate in localization and high in efficiency. The proposed research can not only improve the accuracy and performance of form error assessment, but also provide an effective guideline for the integration of different types of measured surfaces.

关键词： Measured surface localization Umbilicalpoints and complex variable Similar surface patchesInitial and accurate localization

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

Study on the thermally induced spindle angular errors of a five-axis CNC machine tool

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Advances in Manufacturing 2023年第1期11卷 75-92页

作者： Ji Peng Ming yin Li Cao Luo-Feng Xie Xian-Jun Wang guo-Fu yin School of Mechanical Engineering Sichuan UniversityChengdu610065People’s Republic of China

Thermally induced spindle angular errors of a machine tool are important factors that affect the machining accuracy of *** is critical to develop models with good generalization abilities to control these angular thermal ***,the current studies mainly focus on the modeling of linear thermal errors,and an angular thermal error model applicable to different working conditions has rarely been ***,the formation mechanism of the angular thermal error remains to be *** this study,an analytical modeling method was proposed by analyzing the formation and propagation chain of the spindle angular thermal errors of a five-axis computer numerical control(CNC)machine *** effects of the machine tool structure and position were considered in the modeling *** angular thermal error equations were obtained by analyzing the spatial thermoelastic deformation *** analytical model of the spindle angular thermal error was established based on the geometric relation between thermal *** model parameters were identified using the trust region least squares *** results showed that the proposed analytical model exhibited good generalization ability in predicting spindle pitch angular thermal errors under different working conditions with variable spindle rotational speeds,spindle positions,and environmental temperatures in different *** average mean absolute error(MAE),root mean square error(RMSE)and R2 in twelve different experiments were 4.7μrad,5.6μrad and 0.95,*** study provides an effective method for revealing the formation mechanism and controlling the spindle angular thermal errors of a CNC machine tool.

关键词： Machine tool Angular thermal errors Thermal error modeling Analytical model