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Simulation of M-H Loops in FeCo Polycrystalline Thin Films at Finite Temperatures

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Chinese Physics Letters 2017年第4期34卷 101-103页

作者： Long-Ze Wan jiang-nan li Jun-Jie Song Chuan liu Dan Wei School of Materials Science and Engineering Tsinghua University Beijing 100084 School of Physics Peking University Beijing 100871

We apply the hybrid Monte Carlo （HMC） micromagnetie method to FeCo soft magnetic polycrystalline films and test the new method by comparing with the result worked out by micromagnetics using Landau lifshitz-Gilbert equations, and the magnetic properties of FeCo films are understood better by carefully considering the effects of polycrystalline microstructures. The hysteresis loops of the FeCo film from low temperature up to 1100K are simulated by the new HMC micromagnetic method.

关键词： Simulation of M-H Loops in FeCo Polycrystalline Thin Films at Finite Temperatures

加卸载条件下石英岩蠕变–渗流耦合规律试验研究

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岩土工程学报 2017年第10期39卷 1832-1841页

作者：江宗斌姜谙男李宏王善勇大连海事大学道桥研究所辽宁大连116026 大连理工大学岩石破裂与失稳研究中心辽宁大连116026 澳大利亚纽卡斯尔大学土木系

以大东山隧道的石英岩为研究对象,进行循环加卸载条件下岩石蠕变–渗流耦合试验,分析了岩石加卸载过程中的蠕变、渗透性变化规律和渗流–蠕变耦合机理,得到压密阶段、裂纹扩展阶段和裂纹贯通阶段岩石体积应变的发展规律,总结了渗透率与... 详细信息

以大东山隧道的石英岩为研究对象,进行循环加卸载条件下岩石蠕变–渗流耦合试验,分析了岩石加卸载过程中的蠕变、渗透性变化规律和渗流–蠕变耦合机理,得到压密阶段、裂纹扩展阶段和裂纹贯通阶段岩石体积应变的发展规律,总结了渗透率与体积应变之间的关系。试验表明:轴向荷载0~50 MPa为压密阶段,继续加载则产生不可恢复变形,当达到160 MPa时蠕变曲线进入加速段;随着轴向荷载水平的增加,渗透率总体趋势先降低后增高,最小值出现在最大压密点,蠕变过程进入加速段以后渗透率急剧增大。采用FLAC3D中的Cvisc模型为蓝本,以体积应变为桥梁建立ZSI(zone state index)与渗透率的关系,自主开发了基于应变软化的改进非线性蠕变西原模型,对试验结果进行验证。数值模拟表明:靠近进水端的渗透率比出水端变化快,不同应力下ZSI值云图的破损区与试验中岩样的"V"型剪切带破坏模式基本一致,渗透率的理论曲线与计算曲线吻合较好。说明提出的模型能够很好地反映加卸载条件下岩石蠕变–渗流耦合特性和局部破坏规律。

关键词：循环加卸载蠕变–渗流耦合渗透率体积应变单元安全指标

Constraints on holographic QCD phase transitions from PTA observations

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 71-78页

作者： Song He li li Sai Wang Shao-jiang Wang Center for Theoretical Physics and College of Physics Jilin University School of Physical Science and Technology Ningbo University Max Planck Institute for Gravitational Physics (Albert Einstein Institute) CAS Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences School of Fundamental Physics and Mathematical Sciences Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of Sciences (UCAS) School of Physical Sciences University of Chinese Academy of Sciences (UCAS) Theoretical Physics Division Institute of High Energy Physics Chinese Academy of Sciences

The underlying physics of QCD phase transition in the early Universe remains largely unknown due to its strong-coupling nature during the quark-gluon plasma/hadron gas transition, yet a holographic model has been proposed to quantitatively fit the lattice QCD data while with its duration of the first-order phase transition(FoPT) left undetermined. At specific baryon chemical potential, the first-order QCD phase transition agrees with the observational constraint of baryon asymmetry. It, therefore, provides a scenario for phase transition gravitational waves(GWs) within the standard model of particle physics. If these background GWs could contribute dominantly to the recently claimed common-spectrum red noise from pulsar timing array(PTA) observations, the duration of this FoPT can be well constrained, and the associated primordial black holes are still allowed by current observations.

关键词： pulsar timing array QCD phase transition gravitational waves primordial black holes

Effect of lamellarization on the microstructure and mechanical properties of marine 10Ni5CrMoV steel

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 402-413页

作者： Tao Zou Yanwu Dong Zhouhua jiang Shuyang Du Yushuo li School of Metallurgy Northeastern UniversityShenyang 110819China Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China Key Laboratory for Ecological Metallurgy of Multimetallic Ores(Ministry of Education) Northeastern UniversityShenyang 110819China

Multistage heat treatment involving quenching(Q),lamellarizing(L),and tempering(T)is applied to marine 10Ni5CrMoV *** microstructure and mechanical properties were studied by multiscale characterizations,and the kinetics of reverse austenite transformation,strain hardening behavior,and toughening mechanism were further *** lamellarized specimens possess low yield strength but high toughness,especially cryogenic *** leads to the development of film-like reversed austenite at the martensite block and lath boundaries,refining the martensite structure and lowering the equivalent grain *** analysis of austenite reversion based on the JMAK model shows that the isothermal transformation is dominated by the growth of reversed austenite,and the maximum transformation of reversed austenite is reached at the peak temperature(750℃).The strain hardening behavior based on the modified Crussard-Jaoul analysis indicates that the reversed austenite obtained from lamellarization reduces the proportion of martensite,significantly hindering crack propagation via martensitic transformation during the *** a consequence,the QLT specimens exhibit high machinability and low yield *** with the QT specimen,the ductile-brittle transition temperature of the QLT specimens decreases from-116 to-130℃due to the low equivalent grain size and reversed austenite,which increases the cleavage force required for crack propagation and absorbs the energy of external load,*** work provides an idea to improve the cryogenic toughness of marine 10Ni5CrMoV steel and lays a theoretical foundation for its industrial application and comprehensive performance improvement.

关键词： 10Ni5CrMoV steel lamellarizing reversed austenite cryogenic toughness ductile-brittle transition temperature

Design,synthesis and anti-tumor activities of 4H-pyrido[1,2-a]pyrimidin-4-one derivitives

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Design,synthesis and anti-tumor activities of 4H-pyrido[1,2-...

劳动力成本上升对中国上市公司出口的影响:效率效应还是成本效应

2011年全国药物化学学术会议——药物的源头创新

作者： nan jiang,Ting li,Zhichao CHEN,Ping GONG School of Pharmaceutical Engineering,Shenyang Pharmaceutical University

＜正＞Based on the structure-activity relationship of diaryl ureas and with Sorafinib,the first multi-target receptor tyrosine kinase inhibitor,as the leading compound,a novel series of diaryl urea derivatives possessing 4H-pyrido[1,2-α]pyrimidin-4-one group were designed and synthesized, which preserved diaryl urea fragment and various substituents were introduced on the phenyl ring. An efficient and facile synthetic route of 4H-pyrido[1,2-α]pyrimidin-4-one derivitives is described in Scheme 1.

关键词： design synthesis 4H-pyrido[l,2-α]pyrimidin-4-one anti-tumor activity

来源： cnki会议评论

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国际经贸探索 2018年第3期34卷 77-95页

作者：张建武李楠江丽嫒广东外语外贸大学经济与贸易学院广东外语外贸大学商学院华南师范大学经管学院

文章运用2007~2014年间中国A股上市公司微观数据,实证考察了企业出口行为与劳动力成本之间的关系。研究发现:劳动力成本对我国企业的出口有正向相关关系,即劳动力成本的上升会促进企业出口。从不同收入水平的空间分布来看,我国高收入地... 详细信息

文章运用2007~2014年间中国A股上市公司微观数据,实证考察了企业出口行为与劳动力成本之间的关系。研究发现:劳动力成本对我国企业的出口有正向相关关系,即劳动力成本的上升会促进企业出口。从不同收入水平的空间分布来看,我国高收入地区的劳动力成本上升会正向促进企业出口,低收入地区为负向影响,中等收入地区则不存在显著相关关系。为了进一步验证上述结论,文章采用双重差分模型检验"限薪令"政策对企业出口行为的影响,研究结果表明,对高收入者进行薪酬限制会抑制企业的出口行为,这支持了在高收入地区劳动力成本对企业出口的正向影响的结论。

关键词：劳动力成本企业出口效率效应成本效应

Microstructural evolution during the progressive transformation-induced plasticity effect in a Fe-0.1C-5Mnmedium manganese steel

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 369-379页

作者： Mei Zhang Wenhao li Yangfei Chen Yang jiang Xiaofei Guo Han Dong School of Materials Science and Engineering Shanghai UniversityShanghai 200444China State Key Laboratory of Advanced Special Steel Shanghai UniversityShanghai 200444China

The microstructural evolution of a cold-rolled and intercritical annealed medium-Mn steel(Fe-0.10C-5Mn)was investigated during uniaxial tensile ***-situ observations under scanning electron microscopy,transmission electron microscopy,and X-ray diffraction analysis were conducted to characterize the progressive transformation-induced plasticity process and associated fracture initiation *** findings were discussed with the local strain measurements via digital image *** results indicated that Lüders band formation in the steel was limited to 1.5%strain,which was mainly due to the early-stage martensitic phase transformation of a very small amount of the less stable large-sized retained austenite(RA),which led to localized stress concentrations and strain hardening and further retardation of *** small-sized RA exhibited high stability and progressively transformed into martensite and contributed to a stably extended Portevin-Le Chatelier *** volume fraction of RA gradually decreased from 26.8%to 8.2%prior to *** the late deformation stage,fracture initiation primarily occurred at the austenite/martensite and ferrite/martensite interfaces and the ferrite phase.

关键词： medium-Mn steel retained austenite progressive transformation-induced plasticity effect local strain fracture initiation