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Structure evolution of the Fe_(3)C/Fe interface mediated by cementite decomposition in cold-deformed pearlitic steel wires

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Journal of Materials Science & technology 2022年第6期101卷 28-36页

作者： y.t.Zhou X.H.shao S.J.Zheng X.L.Ma Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control technology School of Materials Science and EngineeringHebei University of TechnologyTianjin 300130China

Cold-drawn pearlitic steel wire is irreplaceably used in industry owing to its outstanding mechanical property which is dominated by the cementite/ferrite(Fe_(3)C/Fe) interfaces in the material. However, the fine structures of the Fe3C/Fe interfaces in the deformed wires are less known to date. In this work, transmission electron microscopic investigation was performed on the atomic structures of the interfaces with the Isaichev orientation relationship(OR) in the wires with progressive deformation strains. In addition to the effect of the dislocation/interface interactions, this work revealed that the deformation-induced partial decomposition of cementite plays an important role in the interface reconstruction during deformation. the interfacial carbon vacancies generated by cementite decomposition and particularly, the amorphization of cementite layers in the sample with ε > 1 could effectively annihilated the interfacial dislocations and consequently relaxed the interfacial stress. the correlations between the interface structure changes and the mechanical properties of the wires were discussed.

关键词： Pearlitic steel Cementite decomposition Interface structure Deformation transmission electron microscopy

Asymptotic false discovery control of the Benjamini-Hochberg procedure for pairwise comparisons

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Science China Mathematics 2025年第1期 223-252页

作者： Weidong Liu Dennis Leung Qi-Man shao School of Mathematical Sciences Shanghai Jiao Tong University School of Mathematics and Statistics University of Melbourne Department of Statistics and Data Science SICMSouthern University of Science and Technology

In a one-way analysis-of-variance(ANOVA) model,the number of pairwise comparisons can become large even with a moderate number of *** by this,we consider a regime with a growing number of groups and prove that,when testing pairwise comparisons,the Benjamini-Hochberg(BH) procedure can asymptotically control false discoveries,despite the fact that the involved t-statistics do not exhibit the wellknown positive dependence structure required for exact false discovery rate(FDR) *** tukey's perspective that the difference between the means of any two groups cannot be exactly zero,our main result provides control over the directional false discovery rate and directional false discovery proportion.A key technical contribution of our work is demonstrating that the dependence among the t-statistics is sufficiently weak to establish the convergence result typically required for asymptotic FDR *** analysis does not rely on conventional assumptions such as normality,variance homogeneity,or a balanced design,thereby offering a theoretical foundation for applications in more general settings.

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Cooper　and　Zinc　Superoxide　dismutase　from　Peking　duck　erythrocytes　forms　a　supramolecular　double－helix　in　the　crystal

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Chinese Chemical Letters 1996年第10期7卷 939-941页

作者： Li, PW Luo, y Li, GP shao, MC BEIJING UNIV DEPT CHEMBEIJING 100871PEOPLES R CHINA

the charge isomer fraction(PI 5.9) of the Cu. Zn SOD from duck red blood cell has been crystallized around neutral pH and low ionic strength at 297°*** crystals belong to the trigonel space group P3221, with unit cell a=125.1,c=163.3 and γ=120°. the duck SOD shows a novel packing arrangement consisting of supramolecular double-helix, with 922/972 non-crystallographic border group symmetry in the crystal.

关键词： Peking dismutase duck Superoxide and Cooper

theory and Modeling of Phase transformations under Stress in Steel

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材料热处理学报 2004年第5期25卷 1-7页

作者： t.y. Hsu School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 200030 China

thermodynamic prediction of the increment of the formation temperature of proeutectoid ferrite by appliedstress is nearly consistent with the wxperfimental *** models for ferrite,pearlite and bainite transformations can be shown as modified Johnson-Mehl-Avrami equation in which parameter b() varies with the level of applied *** effects of tensile and compressive stresses on enhancement of the ferrite/pearlite and bainite transformations are discussed,the necessity and approach of modification of additivity hypothesis are introduced and the results from modified equation in which some parameters are obtained by rfegression of two experimental results or taken from ttt and CCt diagrams of a cerftain steel are superior than that from Scheil’s *** calculation of Ms and nucleation kinetics equations of martensitic transformation under stress are *** of phase trasformations under stress in ferrous alloys is briefly

关键词：钢相位转换受力状态热力学动力学成核现象相加性假设铁合金

tWONEW　tRItERPENOID　SAPONINS，AStERBAtANOSIDE　H　AND　I，FROM　AStER　BAtANGENSIS

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Chinese Chemical Letters 1995年第2期6卷 105-108页

作者： shao, y Zhou, BN Lin, LZ Cordell, GA Acad Sinica Shanghai Inst Mat Med Shanghai 200031 Peoples R China Univ Illinois Coll Pharm Dept Med Chem & Pharmacognosy Programm Collaborat Res Pharmaceut Sci Chicago IL USA

two new triterpenoid saponins named asterbatanoside H and I have been isolated from the roots of Aster batsngensis and their structures elucidated as 3-O-β-D-glucopyranosyl-(1→3) β-D-glucopyranosyl-bayogenin-28-O-β-D-glucopyranosyl-(1→6)-β-D-glucopyranosy-(1→6) and 3-O-β-D-glucopyranosyl-(1→3)-β-D-glucopyranosyl-23-O-acetyl-bayogenin-28-O-β-D-glucopyranosyl-(1→6) β-D-glucopyranoside, respectively, by means of spectral and chemical data.

关键词： AStERBAtANOSIDE tRItERPENOID tWONEW FROM SAPONINS AND BAtANGENSIS

Prediction of the Atomic Electron Affinities Using a Wavelet Neural Network

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Chinese Chemical Letters 1998年第2期9卷 203-206页

作者： Liu, L shao, XG Cai, WS Jiang, y Pan, ZX Univ Sci & technol China Dept Chem Hefei 230026 Peoples R China Univ Sci & technol China Dept Appl Chem Hefei 230026 Peoples R China Univ Sci & technol China Dept Phys Hefei 230026 Peoples R China

Wavelet Neural Network (WNN) was employed in a rapid calculation of the atomic electron affinities, with atomic ionization potentials and atomic electron configurations chosen as input parameters. Many unmeasured valu... 详细信息

关键词： Wavelet Neural Network (WNN) atomic electron affinities

tHE StRUCtURE OF AStERBAtANOSIDE J FROM AStER BAtANGENSIS

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Chinese Chemical Letters 1995年第3期6卷 221-224页

作者： shao, y Zhou, BN Lin, LZ Cordell, GA Acad Sinica Shanghai Inst Mat Med Shanghai 200031 Peoples R China Univ Illinois Coll Pharm Dept Med Chem & Pharmacognosy Program Collaborat Res Pharmaceut Sci Chicago IL USA

A new medicagenic acid saponin named asterbatanoside J was isolated from the roots of Aster batangensis. On the basis of chemical and spectral studies especially 2D NMR including COSy, HEtCOR, HOHAHA, ROESy and HMBC techniques, its structure has been established as 3-O-beta -D-glucopyranosyl-(1 -->6)-beta -D-glucopyranosyl-2 beta ,3 beta -dihydroxy-olean-12-en-23 alpha ,28-dioic acid-28-O-alpha -L-arabinopyranosyl-(1 -->3)-alpha -L-rhamnopyranosyl-(1 -->2)-beta -D-fucopyranoside.

关键词： ct^

Islet separation and islet cell culture in vitro from human embryo-pancreas

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World Journal of Gastroenterology 1999年第5期5卷 458-460页

作者： yuan Z Wu Gy He yS shao CM Zhan y Kunming Med Coll Dept Histol & Embryol Kunming 650031 Yunnan Province Peoples R China First Affiliated Hosp Kunming Med Coll Dept Nucl Med Kunming 650032 Yunnan Province Peoples R China Kunming Med Coll Dept Biol Kunming 650031 Yunnan Province Peoples R China

INtRODUCtIONDiabetes mellitus is the most common disease and its death rate ranks the 8th in the world. Up to now, its incidence has a tendency to increase[1]. Since disorder of sugar metabolism might result in microvascular degeneration and injury of important human organs, it will endanger human health seriously. In 1969, younszai first reported the method that could decrease diabetes symptoms by islet tissue transplantation. In 1981, our country began to treat diabetes type Ⅰ by transplanting cultured islet tissues. In our study, we digested the pieces of pancreas with collagenase and made morphological observation on islet cells cultured for 3d, 5d, 7d, 9d and 13d respectively, and the contents of insulin and C-peptide in the supernatant were detected by radioimmunoassay. the experimental model of rabbit diabetes was established, and certain curative effect was achieved in the treatment of experimental diabetes in rats.

关键词： cell culture islet cell islets of langerhans transplantetion pancreas/ embryology

Formation of β' phase in LPSO structures in an Mg88Co5y7 alloy

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Journal of Magnesium and Alloys 2022年第1期10卷 175-182页

作者： Q.Q.Jin X.H.shao y.t.Zhou B.Zhang S.J.Zheng X.L.Ma Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of Sciences72 Wenhua Road110016 ShenyangChina Materials Science and Engineering Research Center Guangxi University of Science and TechnologyLiuzhou 545006China School of Materials Science and Engineering Research Institute for Energy Equipment MaterialsHebei University of TechnologyTianjin 300130China

Formation of β’ phase in long-period stacking ordered(LPSO) structures in an Mg;Co;y;(at.%) alloy after aging at 200 °C for 24 h or electron beam(EB) irradiation has been studied by high-angle annular dark-field scanning transmission electron microscopy(HAADFStEM). β’ phase was precipitated only in the Mg matrix but not in LPSO structures after aging at 200 °C for 24 h. LPSO structure containing stacking defects transforms into the β’-long phase during EB irradiation, which plays a key role in accelerating solute atoms’ diffusion. New complex β’(LPSO) structures formed in the alloy after EB irradiation, such as β’(12 H) structure with an orthorhombic lattice(Mg;y, Cmcm,a = 2 _(a0)= 0.642 nm, b=4√3_(a0), c = 6 _(c0)= 3.12 nm).

关键词： Magnesium alloys Long-period stacking ordered(LPSO)structure HAADF-StEM β’phase