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Mixed Elastico-Plasticity Problems with Partially Unknown Boundaries

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Acta Mathematicae Applicatae Sinica 2007年第4期23卷 629-636页

作者： zuo-liang Xu School of Information Renmin University of China Beijing 100872 China

In this paper, we study mixed elastico-plasticity problems in which part of the boundary is known, while the other part of the boundary is unknown and is a free boundary. Under certain conditions, this problem can be transformed into a Riemann-Hilbert boundary value problem for analytic functions and a mixed boundary value problem for complex equations. Using the theory of generalized analytic functions, the solvability of the problem is discussed.

关键词： Mixed elastico-plasticity problems generalized analytic functions unknown boundaries

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浅谈GC1级蒸汽管道监督检验

锅炉制造 2025年第1期 63-64页

作者：左亮李超吴健铜陵市特种设备监督检验中心安徽铜陵244000

GC1级蒸汽管道(高温、高压)的监督检验,文中从材料、设计、制造与安装、检验与试验具体分析监督检验过程中需要重点关注的地方。

关键词： GC1级蒸汽管道高温高压制造与安装检验与试验

Effects of External Electric Field on AlN Precipitation and Recrystallization Texture of Deep-drawing 08Al Killed Steel Sheet

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Journal of Materials Science & Technology 2006年第6期22卷 747-750页

作者： Xiang ZHAO Zhuochao HU liang zuo Key Laboratory for Anisotropy Design and Texture Engineering of Materials （Ministry of Education） Northeastern University Shenyang 110004 China

The effects of an electric field on AIN precipitation and recrystallization texture were investigated. Cold-rolled 08Al killed steel sheets were annealed at 550℃ according to the two-step processes, for various maintaining times, with and without applying an electric field. It was found that the electric field promotes the precipitation of the second phase （AlN particles）, strengthens the γ-fiber and weakens the α-fiber texture component in the recrystallized specimens. A possible explanation for the reinforcement of γ-fiber texture by the electric field is that the second phase AIN particle promotes the growth of γ-fiber at the expense of differently oriented grains.

关键词： Electric field annealing AlN Recrystallization texture 08Al killed steel sheet

Effect of Zener-Hollomon parameter on deformation microstructure in Fe-3%Si alloy

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Acta Metallurgica Sinica(English Letters) 2011年第1期24卷 1-8页

作者： Fenghui AN Yuhui SHA Fang ZHANG liang zuo Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education) Northeastern UniversityShenyang I10819 China

Hot deformation of Fe=3%Si alloy within the temperature range of 1073-1473 K and strain rate range of 0.01-5 s-1 was carried out by compression test. Optical microscopy （OM）, electron backscattered diffraction （EBSD） and transmission electron microscopy （TEM） were used to characterize the deformation microstructure on various scales. Dynamic recovery is the dominant softening mechanism under all experimental conditions. A dynamic recovery region and partial dynamic recrystallization region can be distinguished according to Zener-Hollomon parameter （Z） based on OM observation. Furthermore, the quantitative description of subgrain size and boundary misorientation has been set up as a function of Zener-Hollomon Darameter.

关键词： Fe-3%Si Hot deformation Microstructure Zener-Hollomonparameter

An Actuarial Approach to Reload Option Valuation for a Non-tradable Risk Assets under Jump-diffusion Process and Stochastic Interest Rate

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Acta Mathematicae Applicatae Sinica 2018年第3期34卷 451-468页

作者： Cong-cong XU zuo-liang XU School of Information Renmin University of China Beijing 100872 China Department of Basic Course Shijiazhuang Institute of Railway Technology Shijiazhuang 050041 China

We use an actuarial approach to estimate the valuation of the reload option for a non-tradable risk asset under the jump-diffusion processes and Hull-White interest rate. We verify the validity of the actuarial approach to the European vanilla option for non-tradable assets. The formulas of the actuarial approach to the reload option are derived from the fair premium principle and the obtained results are arbitrage. Numerical experiments are conducted to analyze the effects of different parameters on the results of valuation as well as their differences from those obtained by the no-arbitrage approach. Finally, we give the valuations of the reload options under different parameters.

关键词： Non-tradable assets reload option actuarial approach jump-diffusion processes stochastic inter-est rate

Thermal deformation behavior and microstructure evolution of modified IN617 alloy with different initial states

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Journal of Iron and Steel Research International 2021年第10期28卷 1315-1328页

作者： Qi Li Xin-liang Jiang Zheng-zong Chen Zheng-dong Liu liang zuo Key Laboratory for Anisotropy and Texture of Materials Ministry of EducationNortheastern UniversityShenyang110819LiaoningChina Erzhong(Deyang)Heavy Equipment Co. Ltd.Deyang618000SichuanChina Institute for Special Steels China Iron and Steel Research InstituteBeijing100081China

The thermal deformation behaviors of the as-cast and wrought modified IN617 nickel-based heat-resistant alloys at different temperatures(1000–1180℃)and strain rates(0.01–1 s^(−1))were *** constitutive equation was established to describe the relationship of the flow stress,temperature,and strain rate during thermal *** effect of the thermal deformation conditions on the microstructure evolution of alloys was studied using electron backscatter *** results revealed that the thermal deformation activation energy of the as-cast alloy was greater than that of the wrought *** dynamic recrystallization(DRX)process is slow at intermediate strain rate(0.1 s^(−1))due to the comprehensive influence of various factors,such as the critical strain of DRX nucleation and stored *** DRX volume fraction increases with the improvement of deformation *** varied dynamic softening mechanisms induce the different thermal deformation behaviors of as-cast and wrought *** dynamic recovery,discontinuous dynamic recrystallization(DDRX)and nucleation at slip zone caused by strain incompatibility in grains were observed during thermal deformation of as-cast *** the process of thermal deformation of wrought alloys,DDRX was the primary dynamic crystallization *** continuous dynamic recrystallization was an auxiliary nucleation mechanism.

关键词： Nickel-based heat-resistant alloy Initial alloy state Thermal deformation Microstructure evolution Dynamic recrystallization nucleation mechanism

Texture Evolutions in Fe-6.5%Si Produced by Rapid Solidification and Chemical Vapor Deposition

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Journal of Materials Science & Technology 2002年第6期18卷 516-518页

作者： liang zuo Guangyong HU Yuhui SHA Claude ESLING School of Materials Science and Metallurgy Northeastern UniversityShenyang 110004China Laboratoire d'Etude des Textures et Application aux Materiaux CNRS UMR 7078Universite de Metz 57045 Metz Cedex 1France

Fe-Si ribbons and thin sheets with 6.5%Si content were prepared by means of the single roller rapid solidification and chemical vapor deposition (CVD), respectively. The initial textures of rapidly solidified Fe-6.5%Si ribbons were characteristic of the {100} fiber-type, which became weakened during primary recrystallization in various atmospheres. At the stage of secondary recrystallization, the {100} texture formed in Ar and the {110} texture in hydrogen, while there occurred a texture transformation from the {100} type to the {110} type in vacuum with the increase of annealing temperature. For Fe-6.5%Si sheets prepared by Si deposition in cold-rolled Fe-3%Si matrix sheets, their textures were dominated by the η-fiber (//RD) with the maximum density at the {120} orientations. After homogenization annealing, the η-fiber could evolve into the {130} type or become more concentrated on the {120} orientations, depending on the cold rolling modes of Fe-3%Si matrix sheets.

关键词： Fe-6.5%Si alloy Texture Rapid solidification Chemical vapor deposition

Crystallite Orientation Analysis for a Multidirectionally Cold Rolled α-Ti Alloy (TA7) Thin Sheet

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Rare Metals 1989年第2期9卷 31-36页

作者： zuo, liang liang, Zhide Xu, Jiazhen Zhao, Xiang Northeast Univ of Technology China

A microcomputer software determining the crystallite orientation distribution functions (ODFs) and inverse pole figures of hexagonal materials with or without orthorhombic physical symmetry has been worked out the first time. The texture measurements and the ODF calculations were performed for a multidirectionally cold rolled α-Ti alloy (TA7) sheet by the application of this software. It is shown that the rolling planes of most grains in the sheet tend to be parallel to (0001) with a deviation to the extent of 40° and is shown a predominance of the orientation zone containing (1016), while the rolling directions are, as a whole, uniformly distributed along all the directions over the rolling planes. Of all the texture components, (2¯117) [01¯10] is slightly stronger than the other.

关键词： Computer Programming Flowcharting Crystals Orientation Mathematical Techniques Least Squares Approximations Metallography Textures Titanium Metallography Computer Simulation

Contribution of Vector Meson Dominance to the Single-Spin Azimuthal Asymmetry in Semi-inclusive Pion Electro-Production

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Chinese Physics Letters 2001年第8期18卷 1021-1023页

作者： XU Qing-Hua liang zuo-Tang Department of Physics Shandong UniversityJi’nanShandong 250100

We calculate the contribution of vector meson dominance to deeply inelastic lepton-nucleon scattering in the kinematic region of the HERMES *** results obtained show that this contribution is quite *** with the fact that there exist very striking left-right asymmetries for hadron produced in single-spin hadron-hadron collisions,these results imply that the single-spin azimuthal asymmetry observed by HERMES cannot be simply regarded as a pure fragmentation effect.

关键词： experiment. effect. hadron