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Research on influence of typical microstructure characteristics of Ni base single crystal on creep rupture and deformation analysis of turbo blade

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航空动力学报 2011年第5期26卷 1148-1158页

作者： cao Juan WANG Yan-rong SHI Duo-qi School of Jet Propulsion Beijing University of Aeronautics and Astronautics Beijing 100191 China

Considering the influence of typical microstructure characteristics on creep performance,a series of UM-F single crystal alloys which had similar element components but different microstructures were used to analyze the relationship between creep life and microstructure characteristics of Ni base single *** main factors were proposed:misfit,volume fraction of precipitate and maximum matrix channel *** Microstate parameter Ymicro was established to estimate the deformation state of the *** linear relationship between the initial value of microstate parameter Y0 and creep life under a certain temperature/load was *** analyzing the high temperature region of turbo blade using the material parameters of DD 3,the creep deformation and the life prediction of the critical points of blade were obtained and the result closed to the test.

关键词：《航空动力学报》期刊摘要编辑部

Tunable CO_(2)enrichment on functionalized Au surface for enhanced CO_(2)electroreduction

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Nano Research 2023年第4期16卷 4723-4728页

作者： Huimin Wang Yuqing Fu Zhe-Ning Chen Wei Zhuang Minna cao rong cao State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China University of Chinese Academy of Sciences Beijing 100049China Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350108China

Electrochemical conversion of carbon dioxide(CO_(2))to higher-value products provides a forward-looking way to solve the problems of environmental pollution and energy ***,the low solubility of CO_(2)in aqueous electrolytes,sluggish kinetics,and low selectivity hamper the efficient conversion of CO_(2).Here,we report a Au-based hybrid nanomaterial by modifying Au nanoparticles(NPs)with the macrocyclic molecule cucurbit[6]uril(Au@CB[6]).Au@CB[6]displays the optimal selectivity of CO,with the highest CO Faraday efficiency(FECO)reaching 99.50%at−0.6 V *** hydrogen electrode(RHE).The partial current density of CO formed by Au@CB[6]increases dramatically,as 3.18 mA/cm2 at−0.6 V,which is more than ten times as that of oleylamine-coated Au NPs(Au@OAm,0.31 mA/cm2).Operando electrochemical measurement combined with density functional theory(DFT)calculations reveals that CB[6]can gather CO_(2)and lead the increased local CO_(2)concentration near metal interface,which realizes significantly enhanced electrochemical CO_(2)reduction reaction(CO_(2)RR)performance.

关键词： molecular surface functionalization Au nanoparticles macrocyclic molecule tunable CO_(2)enrichment electrochemical CO_(2)reduction reaction

Admissibility for Linear Estimator of Parameter on Growth Curve Model with Respect to Linear Constraint

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Acta Mathematicae Applicatae Sinica 2009年第1期25卷 171-176页

作者： Ming-xiang cao Fan-chao Kong Department of Mathematics Hefei Teachers College Heifei 230061 China Department of Mathematics Anhui University Hefei 230038 China

By using the vector-method of matrix, we study Growth Curve Model with respect to linear constraint. Under matrix loss function and vector loss function, we obtain necessary and sufficient conditions for admissibility... 详细信息

关键词： Growth curve model linear estimators admissibility

Constraining nuclear symmetry energy with the charge radii of mirror-pair nuclei

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Nuclear Science and Techniques 2023年第8期34卷 154-163页

作者： rong An Shuai Sun Li-Gang cao Feng-Shou Zhang Key Laboratory of Beam Technology of Ministry of Education College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China Key Laboratory of Beam Technology of Ministry of Education Institute of Radiation TechnologyBeijing Academy of Science and TechnologyBeijing 100875China CAS Key Laboratory of High Precision Nuclear Spectroscopy Institute of Modern PhysicsChinese Academy of SciencesLanzhou 730000China Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator of LanzhouLanzhou 730000China

The nuclear charge radius plays a vital role in determining the equation of state of isospin asymmetric nuclear *** on the correlation between the differences in charge radii of mirror-partner nuclei and the slope parameter(L)of symmetry energy at the nuclear saturation density,an analysis of the calibrated slope parameter L was performed in finite *** this study,relativistic and nonrelativistic energy density functionals were employed to constrain the nuclear symmetry energy through the available databases of the mirror-pair nuclei^(36)Ca–^(36)S,^(38)Ca–^(38)Ar,and ^(54)Ni–^(54)*** deduced nuclear symmetry energy was located in the range 29.89–31.85 MeV,and L of the symmetry energy essentially covered the range 22.50–51.55 MeV at the saturation ***,the extracted L_(s) at the sensitivity density p_(s)=0.10 fm^(-3) was located in the interval range 30.52–39.76 MeV.

关键词： Symmetry energy Charge radii Mirror nuclei

New quantification of symmetry energy from neutron skin thicknesses of^(48)Ca and^(208)Pb

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Nuclear Science and Techniques 2024年第10期35卷 188-196页

作者： rong An Shuai Sun Li-Gang cao Feng-Shou Zhang School of Physics Ningxia UniversityYinchuan 750021China Key Laboratory of Beam Technology of the Ministry of Education College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China Key Laboratory of Beam Technology of the Ministry of Education Institute of Radiation TechnologyBeijing Academy of Science and TechnologyBeijing 100875China Center of Theoretical Nuclear Physics National Laboratory of the Heavy Ion Accelerator of LanzhouLanzhou 730000China

Precise knowledge of the nuclear symmetry energy can be tentatively calibrated using multimessenger *** neutron skin thickness of a heavy nucleus is one of the most sensitive indicators for probing the isovector components of effective interactions in asymmetric nuclear *** studies have suggested that the experimental data from the CREX and PREX2 collaborations are not mutually compatible with existing nuclear *** this study,we review the quantification of the slope parameter of the symmetry energy L from the neutron skin thicknesses of^(48)Ca and^(208)*** energy density functionals classified by various isoscalar incompressibility coefficients K were employed to evaluate the bulk properties of finite *** calculated results suggest that the slope parameter L deduced from^(208)Pb is sensitive to the compression modulus of symmetric nuclear matter,but not that from^(48)*** effective parameter sets classified by K=220 MeV can provide an almost overlapping range of L from^(48)Ca and^(208)Pb.

关键词： Nuclear symmetry energy Neutron skin thickness Energy density functional

General Admissibility for Linear Estimators in a General Multivariate Linear Model under Balanced Loss Function

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Acta Mathematica Sinica,English Series 2013年第9期29卷 1823-1832页

作者： Ming xiang cao Fan Chao KONG Department of Mathematics Hefei Normal University School of Mathematics Anhui University

A generalization of Zellner’s balanced loss function is proposed. General admissibility in a general multivariate linear model is investigated under the generalized balanced loss function. And the sufficient and necessary conditions for linear estimators to be generally admissible in classes of homogeneous and nonhomogeneous linear estimators are given, respectively.

关键词： Balanced loss function linear estimators general optimality general admissibility

The construction and approximation of feedforward neural network with hyperbolic tangent function

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Applied Mathematics(A Journal of Chinese Universities) 2015年第2期30卷 151-162页

作者： CHEN Zhi-xiang cao Fei-long Department of Mathematics Shaoxing University Department of Mathematics China Jiliang University

In this paper, we discuss some analytic properties of hyperbolic tangent function and estimate some approximation errors of neural network operators with the hyperbolic tan- gent activation function. Firstly, an equation of partitions of unity for the hyperbolic tangent function is given. Then, two kinds of quasi-interpolation type neural network operators are con- structed to approximate univariate and bivariate functions, respectively. Also, the errors of the approximation are estimated by means of the modulus of continuity of function. Moreover, for approximated functions with high order derivatives, the approximation errors of the constructed operators are estimated.

关键词： Hyperbolic tangent function neural networks approximation modulus of continuity

Nano-montmorillonite-doped lubricating grease exhibiting excellent insulating and tribological properties

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Friction 2017年第2期5卷 219-230页

作者： Zhengfeng cao Yanqiu XIA xiang XI School of Energy Power and Mechanical Engineering North China Electric Power University Beijing 102206 China

Three types of nano-montmorillonite were doped as additives to afford lubricating *** physicochemical,insulating,and tribological performances of the obtained lubricating greases were investigated in ***,the tribological action mechanisms were analyzed by high magnification optical microscope,Raman spectroscopy,and energy dispersive X-ray spectroscope (EDS).The results show that the inorganic modification montmorillonite (IOMMT) can significantly increase the number of electron traps in the base grease,leading to excellent insulating ***,IOMMT as a novel lubricant additive (1.5 wt％ in grease) significantly enhances the friction reducing and anti-wear abilities for steel/steel contact that comprises a unique layered structure to prevent friction between the contact pairs and the protective tribofilm generated by physical adsorption and chemical reaction.

关键词： nano-montmorillonite insulation friction and wear

Effects of Coiling Temperature and Cooling Condition on Transformation Behavior of Tertiary Oxide Scale

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Journal of Iron and Steel Research International 2015年第10期22卷 892-896页

作者： Guang-ming cao Teng-zhi WU rong XU Zhi-feng LI Fu-xiang WANG Zhen-yu LIU State Key Laboratory of Rolling and Automation Northeastern University

The influences of coiling temperature and cooling condition on structural transformation of the hot-rolled tertiary oxide scale formed under continuous cooling conditions were studied by thermal gravimetric analyzer. The fourth oxide scale formed under different conditions were classified and plotted. Because the oxide scale structure transformation is diffusion-controlled and the transformation law is similar to ＂C＂ curve, the eutectoid transformation nose temperature is 450 ℃. Under condition of low temperature and high cooling rate, ion diffusion behavior is restricted so that the eutectoid reaction is suppressed, resulting in that the fourth oxide scale is mainly made up of pre-eutectoid Fe304 and FeO without eu- tectoid products. From scale structure transition diagram, the eutectoid reaction process was affected by coiling temperature and cooling rate, leading to various scale structures.

关键词： oxide scale eutectoid transformation continuous cooling coiling temperature cooling rate