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Tribocorrosion Behavior of 304 Stainless Steel in 0.5 mol/L Sulfuric Acid

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Acta Metallurgica Sinica(English Letters) 2018年第10期31卷 1049-1058页

作者： ming liu De-li Duan Sheng-li Jiang ming-yang li Shu li Institute of Metal Research Chinese Academy of Sciences School of Materials Science and Engineering University of Science and Technology of China

The tribocorrosion behavior of 304 stainless steel was studied through comparing the damage behavior of 304 stainless steel in dilute sulfuric acid to that in distilled water by a reciprocating tribotester. The re-passivation behavior, the surface and sectional morphological features, as well as the change of microhardness of samples were studied, and the tribocorrosion mechanism was also discussed. The experimental results reveal that the damage of stainless steel in dilute sulfuric acid was caused by the steel＇s mechanical removal and electrochemical dissolution. The wear mechanism of stainless steel is abrasive wear, which mainly consists of micro-cutting and peeling. The synergetic action between corrosion and wear is notable. The corrosive environment leads to the embrittlement of the surface layer, and the wear destroys the passivation film and causes galvanic corrosion.

关键词： Stainless steel Tribocorrosion Synergetic action Reciprocating wear test Re-passivation

On s-semipermutable Subgroups of Finite Groups

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Acta Mathematica Sinica,English Series 2010年第11期26卷 2215-2222页

作者： yang ming li Xuan li HE Yan ming WANG Department of Mathematics Guangdong University of Education Guangzhou 510310 P. R. China Department of Mathematics Guangxi University Nanning 530004 P. R. China Department of Mathematics and lingnan College Sun Yat-Sen University Guangzhou 510275 P. R. China

Suppose that G is a finite group and H is a subgroup of G. We say that H is ssemipermutable in G if HGv = GpH for any Sylow p-subgroup Gp of G with （p, ｜H｜） = 1. We investigate the influence of s-semipermutable su... 详细信息

关键词： s-semipermutable subgroup the generalized Fitting subgroup p-nilpotent group saturated formation

Blow Up Behavior for a Semilinear Parabolic Equation with Localized Source

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Acta Mathematicae Applicatae Sinica 2010年第1期26卷 133-144页

作者： ming yang Hui-ling li Department of Mathematics Southeast University Nanjing 210096 China

In this paper, we investigate the blow-up behavior of solutions of a parabolic equation with localized reactions. We completely classify blow-up solutions into the total blow-up case and the single point blow-up case, and give the blow-up rates of solutions near the blow-up time which improve or extend previous results of several authors. Our proofs rely on the maximum principle, a variant of the eigenfunction method and an initial data construction method.

关键词： semilinear parabolic equation single point blow-up total blow-up blow up rate localized source

Microstructure homogenization control of Nb-bearing X65 pipeline steel by the CSP process

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International Journal of Minerals,Metallurgy and Materials 2011年第1期18卷 35-41页

作者： ming-yang li Ya-zheng liu Tao Zhu Ying Wang School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Technology Center of Masteei Co. Ltd. Maanshan 243000 China

In order to get the controlled methods of microstructure homogenization and high strengthening-toughening combination by compact strip production （CSP） rolling,the dynamic recrystallization characteristics of each pass were obtained during CSP rolling using a Gleeble-1500 thermal mechanical ***,the CSP process was simulated by laboratory rolling *** thermal mechanical simulation experiment and laboratory rolling experiment,a design idea of Nb-bearing pipeline steel by CSP can be obtained as the following：the level of dynamic recrystallization behavior should be increased through the reasonable balance of high deformation temperature and deformation amount in F1 and F2 passes,and F3-F7 passes should be controlled in the austenite non-recrystallization ***,X65 pipeline steel with microstructure uniformity and good properties was produced by *** yield strength is up to 497 MPa,the tensile strength is up to 563 MPa,the elongation is 30% on average,and the toughness is very good whose Charpy impact value is 110 J on average and drop-weight tear test shearing areas are all 100% at -60,-40,-20,0,and 20℃.

关键词： pipeline steel hot rolling dynamic recrystallization precipitation microstructure mechanical properties

Teleportation with an Arbitrary Mixed Resource as a Trace-Preserving Quantum Channel

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Communications in Theoretical Physics 2002年第3期38卷 301-304页

作者： Sergio Albeverio FEI Shao-ming yang Wen-li Institut fiir Angewandte Mathematik Universitat Bonn D-53115 Germany Institut fiir Angewandte Mathematik Universitat Bonn D-53115 Germany Department of Mathematics Capital Normal University Beijing 100037 China Physikalisches Institut der Universitat Bonn 53115 Bonn Germany Institute of Modern Physics Northwest University Xi'an 710069 China

General conditions are given in order to perform a perfect teleportation process in the case where theHilbert spaces involved have different dimensions. An explicit expression is obtained for the quantum channel associatedwith the standard teleportation protocol To with an arbitrary mixed state resource. The transmission fidelity of thecorresponding quantum channel is given.

关键词： teleportation, fidelity

Arabidopsis MSBP1 Is Activated by HY5 and HYH and Is Involved in Photomorphogenesis and Brassinosteroid Sensitivity Regulation

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Molecular Plant 2011年第6期4卷 1092-1104页

作者： Qiu-ming Shi Xi yang li Song Hong-Wei Xue National Key Laboratory of Plant Molecular Genetics Institute of Plant Physiology and Ecology Shanghai Institutes for Biological Sciences Chinese Academy of Sciences 300 Fenglin Road 200032 Shanghai PR China

Membrane Steroid Binding Protein 1 （MSBP1） can bind steroids in vitro and negatively regulates brassinosteroid （BR） signaling, as well as cell elongation and expansion. Detailed analysis of the MSBP1 expression pattern based on quantitative real-time RT-PCR and promoter-GUS fusion studies revealed that MSBP1 expression in hypocotyls is stimulated by various light conditions, Interestingly, MSBP1 expression is greatly suppressed in hyS, hyh, or hy5hyh mutants but enhanced in cop1 mutants, Further analysis employing a yeast one-hybrid assay, an electrophoretic mobility shift assay （EMSA）, and a Chromatin IP （CHIP） assay confirmed the direct binding of Long Hypocotyl 5 （HY5） and HY5 Homolog （HYH） to the promoter region of MSBP1, indicating that MSBP1 is involved in light-regulated hypocotyl growth by serving as a direct target for HY5 and HYH. In addition, hy5 and hy5 hyh mutants show altered BR responses to light, which is consistent with the suppressed expression of MSBP1 in these mutants. These results suggest that light triggers MSBP1 ex- pression through direct binding to and activation by HY5 and HYH, thereby inhibiting hypocotyl elongation. The findings also provide informative clues regarding the mechanisms for the negative regulation of BR sensitivity and photomorpho- genesis during the dark-light transition.

关键词： MSBP1 HY5 HYH photomorphogenesis BR signaling.

NUMERICAL SIMULATION OF 2D HORIZONTAL COOliNG WATER DISCHARGE IN GENERAliZED CURVIliNEAR COORDINATE

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Journal of Hydrodynamics 2006年第1期18卷 91-96页

作者： XIE Zuo-tao ZHANG Xiao-feng TAN Guang-ming yang Fang-li State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan UniversityWuhan 430072 China

2D horizontal model is one of the major mathematical methods for the research on cooling water discharge from the power plant. In this paper, the shallow water equations are transformed under the generalized curvilinear coordinate system and the elliptic differential equations are used to generate curvilinear grids, so a model in generalized curviline ar coordinate is presented to simulate 2D horizontal cooling water, Governing equations of the model are discretized by finite volume method, and non-staggered grids and SIMPLE algorithm are introduced to simplify the program during the discretization. This model is used to simulate the movement of cooling water in a simplified meandering channel and a natural channel, calculating results indicate this model can correctly reflect the movement rules of cooling water, which verifies the model can be applied in engineering practice.

关键词： cooling water generalized curvilinear coordinate non-staggered grids numerical simulation SIMPLE algorithm

Experimental study on the oxidation behavior and microstructural evolution of NG-CT-10 and NG-CT-20 nuclear graphite

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Nuclear Science and Techniques 2019年第11期30卷 139-148页

作者： Wei Lu ming-yang li Xiao-Wei li Xin-Xin Wu li-Bin Sun Zheng-Cao li Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education Collaborative Innovation Center of Advanced Nuclear Energy TechnologyInstitute of Nuclear and New Energy TechnologyTsinghua UniversityBeijing 100084China State Key Laboratory of New Ceramics and Fine Processing Key Laboratory of Advance Materials(MOE)School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Department of Engineering Physics Tsinghua UniversityBeijing 100084China

NG-CT-10 and NG-CT-20 are newly developed grades of nuclear-grade graphite from *** this study,their oxidation behaviors were experimentally investigated using thermal gravimetric *** evolution before and after oxidation was investigated using scanning electron microscope,mercury intrusion,and Raman *** apparent activation energy of NG-CT-10 nuclear graphite is 161.4 kJ/mol in a reaction temperature range of 550–700℃and that of NG-CT-20 is 153.5 kJ/mol in a temperature range of 550–650℃.The activation energy in the inner diffusion control regime is approximately half that in the kinetics control *** high temperatures,the binder phase is preferentially oxidized over the filler particles and small pores are generated in the *** new large or deep pores are generated on the graphite *** can diffuse along the boundaries of filler particles and through the binder phase,but cannot diffuse into the spaces between the nanocrystallites in the filler *** particles are oxidized starting at their outer surfaces,and the sizes of nanocrystallites do not decrease following oxidation.

关键词： Nuclear graphite Oxidation NG-CT-10 NG-CT-20 Activation energy

Study of main factors influencing unsteady-state temperature drop in oil tank storage under dynamic thermal environment coupling

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Petroleum Science 2023年第6期20卷 3783-3797页

作者： Wei Sun ming-yang li Yu-Duo liu Qing-lin Cheng li-Xin Zhao Shuai Shao Zhi-Hua Wang Key Laboratory for Enhancing Oil&Gas Recovery of Ministry of Education Northeast Petroleum UniversityDaqing163318HeilongjiangChina

With the increasing oil demand, the construction of oil energy reserves in China needs to be further strengthened. However, given that there has been no research on the main influencing factors of crude oil temperature drop in storage tanks under actual dynamically changing environments, this paper considers the influence of dynamic thermal environment and internal crude oil physical properties on the fluctuating changes in crude oil temperature. A theoretical model of the unsteady-state temperature drop heat transfer process is developed from a three-dimensional perspective. According to the temperature drop variation law of crude oil storage tank under the coupling effect of various heat transfer modes such as external forced convection, thermal radiation, and internal natural convection, the external dynamic thermal environment influence zone, the internal crude oil physical property influence zone, and the intermediate transition zone of the tank are proposed. And the multiple non-linear regression method is used to quantitatively characterize the influence of external ambient temperature, solar radiation, wind speed, internal crude oil density, viscosity, and specific heat capacity on the temperature drop of crude oil in each influencing zone. The results of this paper not only quantitatively explain the main influencing factors of the oil temperature drop in the top, wall, and bottom regions of the tank, but also provide a theoretical reference for oil security reserves under a dynamic thermal environment.

关键词： Oil temperature drop Forced convection Natural convection Dynamic thermal environment Quantitative analysis