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Adiabatic shear instability.in a titanium alloy.Extreme deformation-induced phase transformation,nanotwinning,and grain refinement

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Journal of Materials Science & Technology 2023年第19期150卷 104-113页

作者： X.R.Guan q.Chen S.J.q. G.J.Cao H.Wang A.H.feng D.L.Chen School of Materials Science and Engineering Tongji UniversityShanghai 201804China Southwest Technology.and Engineering Research Institute Chongqing 400039China Shanghai Key.Laboratory.of D&A for Metal-Functional Materials School of Materials Science&EngineeringTongji UniversityShanghai 201804China Key.Laboratory.for Light-weight Materials Nanjing Tech UniversityNanjing 210009China Interdisciplinary.Center for Additive Manufacturing School of Materials and ChemistryUniversity of Shanghai for Science and TechnologyShanghai 2000093China Department of Mechanical and Industrial Engineering Toronto Metropolitan University(formerly Ryerson University)TorontoON M5B 2K3Canada

Increasingly.harsh service conditions place higher req.irements for the high strain-rate performance of titanium *** shear band(ASB),a phenomenon prone to dy.amic loading,is often accom-panied by.catastrophic ***,it is unclear how the internal nanostructures are related to shear *** we report detailed microstructural evolution in the ASB of a titanium alloy.via in-depth focused ion beam(FIB),transmission Kikuchi diffraction(TKD),and high-resolution transmission electron microscope(HRTEM)analy.es,with the deformation instability.phenomenon discussed from the energy.*** ASB interior undergoes multifaceted changes,namely.deformation-induced beta-to-alpha transformation and deformation-induced martensitic transformation to form substantially.refined and heterogeneous ***,two ty.es of extremely.fine twins are identified to occur within both nano-sized martensite and alpha *** critical plastic work representing the onset of adiabatic shear instability.and dy.amic eq.ilibrium is observed to be constant for a specific structure in the same deformation *** energy.analy.is could be extended to other materials subjected to high strain-rate dy.amic deformation.

关键词： Adiabatic shear instability Deformation-induced phase transformation Deformation-induced nanotwinning Dy.amic recovery Energy.analy.is

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Micro-scaled plastic y.elding and shear-banding dy.amics in metallic glasses

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Journal of Materials Science & Technology 2023年第21期152卷 237-246页

作者： D.X.Han G.Wang q.Wang R.feng X.D.Ma K.C.Chan C.T.Liu Institute of Materials Shanghai UniversityShanghai 200444China Department of Industrial and Sy.tems Engineering The Hong Kong Polytechnic UniversityHong KongChina Neutron Scattering Division Oak Ridge National LaboratoryOak RidgeTN 37831United States Department of Material Science and Engineering College of Science and EngineeringCity University of Hong KongHong KongChina Center for Advanced Structural Materials College of Science and EngineeringCity University of Hong KongHong KongChina

Shear-banding behavior in metallic glasses play. a key.role in the operation of plastic deformation,which is associated with y.eld *** a micro-scale,the shear-banding behavior must be affected by.many.factors from the test machine and the ***,in this study.comprehensively.considering a machine compliance,a geometry.imperfection of micro-pillar,and a substrate sink-in the machine-sample-substrate sy.tem,we developed a plastic-strength model at a micrometer scale in this study.which is evidenced by.the microscale compressive properties of 18 kinds of metallic *** the-oretical model provides a guidance for the elastic limits and shear-banding dy.amics of metallic glasses at the micro-scale,which can be applicable to characterize the microscale deformation behavior of other amorphous materials.

关键词： Metallic glasses Shear-banding dy.amics Micro-compression Plastic deformation

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真核基因启动子非依赖的功能转录延伸复合物的体外组装(英文)

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生物化学与生物物理进展 2006年第10期33卷 1000-1006页

作者：刘巍峰 SVEJSTRUP q.JESPER 山东大学生命科学学院微生物技术国家重点实验室济南250100 Clare Hall Laboratories London Research InstituteCancer Research UKEN6 3LDUnited Kingdom

真核生物RNA聚合酶Ⅱ的持续合成能力对基因转录过程中每一个阶段,包括启动子脱离、转录暂停、转录终止以及转录偶联DNA损伤修复过程的调节至关重要.在RNA聚合酶Ⅱ介导的转录延伸过程中,其和模板DNA及转录产物RNA紧密结合,形成一个非常... 详细信息

真核生物RNA聚合酶Ⅱ的持续合成能力对基因转录过程中每一个阶段,包括启动子脱离、转录暂停、转录终止以及转录偶联DNA损伤修复过程的调节至关重要.在RNA聚合酶Ⅱ介导的转录延伸过程中,其和模板DNA及转录产物RNA紧密结合,形成一个非常稳定的延伸三维复合物(elongationcomplex,EC).此特征性“泡”状结构的形成是RNA聚合酶Ⅱ持续合成能力所必需的.在不依赖启动子及众多转录起始因子的条件下,利用人工合成的RNA与DNA寡核苷酸,在体外组装形成具有功能转录活性的延伸复合物.结果表明,长度为9个核苷酸的RNA与模板DNA形成的杂合分子对转录延伸复合物的形成是必需的,而非转录模板DNA链的加入导致最终活性转录“泡”状复合物的形成,并可转录形成与模板相关的转录产物,进一步通过在模板DNA的特定位置引入一个乙酰氧乙酰氨基芴修饰基团,可特异性地阻断转录延伸过程,从而显示该系统在研究真核基因转录及转录偶联DNA损伤修复机制中的潜在应用价值.

关键词： RNA聚合酶转录延伸复合物 TCR

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介孔二氧化锆分子筛的合成机理述评

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分子催化 2006年第1期20卷 84-94页

作者：刘欣梅阎子峰 G. q. Lu 中国石油大学ARC重质油加工国家重点实验室山东东营257061 NanoMae Centre University of Queensland Brisbane 4072

MCM-41介孔分子筛的成功开发，不仅打破了微孔分子筛在吸附、择形催化、吸附分离等领域的应用局限性，而且拓宽了新型材料的制备途径．它使人们在材料合成中由过去仅有的经典单分子作用机制，拓展到多分子的液晶模板机理，即超分子自组... 详细信息

MCM-41介孔分子筛的成功开发，不仅打破了微孔分子筛在吸附、择形催化、吸附分离等领域的应用局限性，而且拓宽了新型材料的制备途径．它使人们在材料合成中由过去仅有的经典单分子作用机制，拓展到多分子的液晶模板机理，即超分子自组装过程．由此可以清楚地看到介孔分子筛的开发为人们探索新材料、新结构提供了另一途径，即引入表面活性剂胶束／液晶导向结构．

关键词：介孔二氧化锆合成机理制备方法介观孔结构应用

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Modeling of alkali-silica reaction in concrete:a review

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Frontiers of Structural and Civil Engineering 2012年第1期6卷 1-18页

作者： J.W.PAN y.T.feng J.T.WANG q.C.SUN C.H.ZHANG D.R.J.OWEN State Key.Laboratory.of Hy.roscience and Engineering Tsinghua UniversityBeijing100084China Civil and Computational Engineering Research Centre College of EngineeringSwansea UniversitySwanseaSA28PPUK

This paper presents a comprehensive review of modeling of alkali-silica reaction(ASR)in *** modeling is essential for investigating the chemical expansion mechanism and the subseq.ent influence on the mechanical aspects of the *** concept of ASR and the mechanism of expansion are first outlined,and the stateof-the-art of modeling for ASR,the focus of the paper,is then presented in *** modeling includes theoretical approaches,meso-and macroscopic models for ASR *** theoretical approaches dealt with the chemical reaction mechanism and were used for predicting pessimum size of *** models have attempted to explain the mechanism of mechanical deterioration of ASR-affected concrete at material *** macroscopic models,chemomechanical coupling models,have been generally.dcveloped by.combining the chemical reaction kinetics with linear or nonlinear mechanical constitutive,and were applied to reproduce and predict the long-term behavior of struetures suffering from ***,a conclusion and discussion of the modcling are given.

关键词： alkali-silica reaction(ASR) modeling concrete mesoscopic macroscopic

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Fatigue Reliability.of Deck Structures Subjected to Correlated Crack Growth

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Journal of Marine Science and Application 2013年第4期12卷 413-421页

作者： G.q.feng y.Garbatov C.Guedes Soares Centre for Marine Technology.and Engineering (CENTEC) Instituto Superior Técnico University of LisbonAv. Rovisco Pais

The objective of this work is to analy.e fatigue reliability.of deck structures subjected to correlated crack *** stress intensity.factors of the correlated cracks are obtained by.finite element analy.is and based on which the geometry.correction functions are *** Monte Carlo simulations are applied to predict the statistical descriptors of correlated cracks based on the Paris-Erdogan eq.ation.A probabilistic model of crack growth as a function of time is used to analy.e the fatigue reliability.of deck structures accounting for the crack propagation correlation.A deck structure is modelled as a series sy.tem of stiffened panels,where a stiffened panel is regarded as a parallel sy.tem composed of plates and are *** has been proven that the method developed here can be conveniently.applied to perform the fatigue reliability.assessment of structures subjected to correlated crack growth.

关键词： crack growth fatigue reliability deck structures correlation stiffened panel

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Bone morphogenetic protein-2 gene controls tooth root development in coordination with formation of the periodontium

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International Journal of Oral Science 2013年第2期5卷 75-84页

作者： Audrey.Rakian Wu-Chen y.ng Jelica Gluhak-Heinrich y.ng Cui Marie A Harris Demitri Villarreal Jerry.q.feng Mary.MacDougall Stephen E Harris Department of Periodontics University of Texas Health Science Center at San Antonio Bay.or College of Dentistry Texas A&M System University.of Alabama School of Dentistry

Formation of the periodontium begins following onset of tooth-root formation in a coordinated manner after birth. Dental follicle progenitor cells are thought to form the cementum, alveolar bone and Sharpey.s fibers of the periodontal ligament （PDL）. However, little is known about the regulatory.morphogens that control differentiation and function of these progenitor cells, as well as the progenitor cells involved in crown and root formation. We investigated the role of bone morphogenetic protein-2 （Bmp2） in these processes by.the conditional removal of the Bmp2 gene using the Sp7-Cre-EGFP mouse model. Sp7-Cre-EGFP first becomes active at E18 in the first molar, with robust Cre activity.at postnatal day.0 （PO）, followed by.Cre activity.in the second molar, which occurs after P0. There is robust Cre activity.in the periodontium and third molars by.2 weeks of age. When the Bmp2gene is removed from Sp7＋（Osterix＋） cells, major defects are noted in root, cellular cementum and periodontium formation. First, there are major cell autonomous defects in root-odontoblast terminal differentiation. Second, there are major alterations in formation of the PDLs and cellular cementum, correlated with decreased nuclear factor IC （Nfic）, periostin and α-SMA＋ cells. Third, there is a failure to produce vascular endothelial growth factor A （VEGF-A） in the periodontium and the pulp leading to decreased formation of the microvascular and associated candidate stem cells in the Bmp2-cKOsp7-cre＇EGFe. Fourth, ameloblast function and enamel formation are indirectly.altered in the Bmp2-cKOsp7-cre＇EGFe. These data demonstrate that the Bmp2 gene has complex roles in postnatal tooth development and periodontium formation.

关键词： Bmp2 gene cementum dentinogenesis periodontium development root formation

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Measurement of the integrated Luminosities of cross-section scan data samples around theψ(3770)mass region

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Chinese Phy.ics C 2018年第6期42卷 1-8页

作者： M. Ablikim M. N. Achasov S. Ahmed M. Albrecht M. Alekseev A. Amoroso F. F. An q. An y. Bai O. Bakina R. Baldini Ferroli y. Ban K. Begzsuren D. W. Bennett J. V. Bennett N. Berger M. Bertani D. Bettoni F. Bianchi E. Boger I. Boy.o R. A. Briere H. Cai X. Cai O. Cakir A. Calcaterra G. F. Cao S. A. Cetin J. Chai J. F. Chang W. L. Chang G. Chelkov G. Chen H. S. Chen J. C. Chen M. L. Chen P. L. Chen S. J. Chen X. R. Chen y. B. Chen X. K. Chu G. Cibinetto F. Cossio H. a. Dai, J. F. Dai A. Dbey.si D. Dedovich Z. y. Deng A. Denig I. Deny.enko M. Destefanis F. De Mori y. Ding C. Dong J. Dong L. y. Dong M. y. Dong Z. L. Dou S. X. Du P. F. nuan J. Fang S. S. Fang y. Fang R. Farinelli L. Fava S. Fegan F. Feldbauer G. Felici C. q. feng E. Fioravanti M. Fritsch C. D. Fu q. Gao X. L. Gao y. Gao, y. G. Gao Z. Gao B. Garillon I. Garzia A. Gilman K. Goetzen L. Gong W. X. Gong W. Gradl M. Greco L. M. Gu M. H. Gu y. T. Gu A. q. Guo L. B. Guo R. P. Guo y. F. Guo A. Guskov Z. Haddadi S. Han X. q. Hao F. A. Harris Z. L. He X. O. He F. H. Heinsius T. Held y. K. Heng T. Holtmann Z. L. Hou H. M. Hu J. F. gu T. Hu y. Hu G. S. Huang J. S. Huang X. T. Huang X. Z. Huang Z. L. guang T. Hussain W. Ikegami Andersson M Irshad q. Ji q. P. Ji X. B. Ji X. L. Ji X. S. Jiang X. y. Jiang J. B. Jiao Z. Jiao D. P. Jin S. Jin y. Jin T. Johansson A. Julin N. Kalantar-Nay.stanaki X. S. Kang M. Kavatsy.k B. C. Ke T. Khan A. Khoukaz P. Kiese R. Kliemt L. Koch O. B. Kolcu B. Kopf M. Kornicer M. Kuemmel M. Kuessner A. Kupsc M. Kurth W. Kiihn J. S. Lange M. Lara P. Larin L. Lavezzi S. Leiber H. Leithofi C. Li Cheng Li D. M. Li F. Li F. y. Li G. Li H. B. Li H. J. Li J. C. Li J. W. Li K. J. Li Kang Li Ke Li Lei Li P. L. Li P. R. Li q. y. Li T. Li W. D. Li W. G. Li X. L. Li X. N. Li X. q. Li Z. B. Li H. Liang y. F. Liang y. T. Liang G. R. Liao L. Z. Liao J. Libby.C. X. Lin D. X. Lin S. Liu B. J. Liu C. X. Liu D. Liu D. y. Liu F. H. Liu Fang Liu feng Liu H. B. Liu H. L Liu H. M. Liu Huanhuan Liu Huihui Liu J. B. Liu J. y. Liu K. Liu K. y. Liu Ke Liu L. D. Liu q. Liu S B. Y. Zhang144 C. C. Zhang1D. H. Zhang1 H. H. Zhang45H. Y. Zhang144 J. Zhang151 J. L. Zhang65 J. Q. Zhang4 J. W. Zhang1 J. Y. Zhang1 J. Z. Zhang151 K. Zhang151 L. Zhang46 S. F. Zhang35 T. J. Zhang3975 X. Y. Zhang38 Y. Zhang4457 Y. H. Zhang144 Y. T. Zhang4557 Yang Zhang1 Yao Zhang1 Yu Zhang51 Z. H. Zhang6 Z. P. Zhan57Z. Y. Zhang64 G. Zhao1J. W. Zhao144 J. Y. Zhao151 J. Z. Zhao144 Lei Zhao4457 Ling Zhao1 M. G. Zhao35 Q. Zhao1 S. J. Zhao67 T. C. Zhao1 Y. B. Zhao144 Z. G. Zhao4457 A. Zhemehugov2869 B. Zheng58J. P. Zheng144 W. J. Zheng38 Y. H. Zheng51B. Zhong33 L. Zhou144 Q. Zhou151 X. Zhou64 X. K. Zhou4457 X. R. Zhou4457 X. Y. Zhou1 A. N. Zhu151 J. Zhu35 J. Zhu45 K. Zhu1 K. J. Zhu1 S. Zhu1 S. H. Zhu56 X. L. Zhu46 Y. C. Zhu4457 Y. S. Zhu151 Z. A. Zhu151 J. Zhuang144B. S. Zou1 J. H. Zou1 （ 1 Institute of High Energy Physics Beijing 100049 China Beihang University Beijing 100191 China Beijing Institute of Petrochemical Technology Beijing 102617 China Bochum Ruhr-University D-44780 Bochum Germany Carnegie Mellon University Pittsburgh Pennsylvania 15213 USA Central China Normal University Wuhan 430079 China China Center of Advanced Science and Technology Beijing 100190 China COMSATS Institute of Information Technology Lahore Defence Road Off Raiwind Road 54000 Lahore Pakistan G.I. Budker Institute of Nuclear Phy.ics SB RAS （BINP） Novosibirsk 630090 Russia GSI Helmholtzcentre for Heavy.Ion Research GmbH D-64291 Darmstadt Germany Guangxi Normal University Guilin 541004 China Guangxi University Nanning 530004 China Hangzhou Normal University Hangzhou 310036 China Helmholtz Institute Mainz JohannwJoachim-Becher-Weg 45 D-55099 Mainz Germany Henan Normal University Xinxiang 453007 China Henan University.of Science and Technology Luoyang 471003 China Huangshan College Huangshan 245000 China Hunan Normal University Changsha 410081 China Hunan University Changsha 410082 China Indian Institute of Tec

To investigate the nature of the Ψ（3770） resonance and to measure the cross section for e^＋e^-→DD, a cross-section scan data sample, distributed among 41 center-of-mass energy.points from 3.73 to 3.89 GeV, was taken with the BESIII detector operated at the BEPCII collider in the y.ar 2010. By.analy.ing the large angle Bhabha scattering events, we measure the integrated luminosity.of the data sample at each center-of-mass energy.point. The total integrated luminosity.of the data sample is 76.16±0.04±0.61 pb^-1, where the first uncertainty.is statistical and the second sy.tematic.

关键词： Bhabha scattering events integrated luminosity.BESⅢ

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Expression analy.is of a-smooth muscle actin and tenascin-C in the periodontal ligament under orthodontic loading or in vitro culture

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International Journal of Oral Science 2015年第4期7卷 232-241页

作者： Hui Xu Ding Bai L-Bruno Ruest Jian q.feng y.ng-Wen Guo y. Tian y.n Jing y.o He Xiang-Long Han State Key.Laboratory.of Oral Diseases Department of OrthodonticsWest China Hospital of StomatologySichuan University Department of Biomedical Sciences Baylor College of DentistryTexas A&M University

α-smooth muscle actin （α-SMA） and tenascin-C are stress-induced phenoty.ic features of my.fibroblasts. The expression levels of these two proteins closely.correlate with the extracellular mechanical microenvironment. We investigated how the expression of α-SMA and tenascin-C was altered in the periodontal ligament （PDL） under orthodontic loading to indirectly.reveal the intrinsic mechanical microenvironment in the PDL. In this study. we demonstrated the sy.ergistic effects of transforming growth factor-β1 （TGF-β1） and mechanical tensile or compressive stress on my.fibroblast differentiation from human periodontal ligament cells （hPDLCs）. The hPDLCs under higher tensile or compressive stress significantly.increased their levels of α-SMA and tenascin-C compared with those under lower tensile or compressive stress. A similar trend was observed in the tension and compression areas of the PDL under continuous light or heavy.orthodontic load in rats. During the time-course analy.is of expression, we observed that an increase in α-SMA levels was matched by.an increase in tenascin-C levels in the PDL under orthodontic load in vivo. The time-dependent variation of α-SMA and tenascin-C expression in the PDL may.indicate the time-dependent variation of intrinsic stress under constant extrinsic loading.

关键词： α-smooth muscle actin mechanical load my.fibroblast periodontal ligament tenascin-C transforming growthfactor-β1

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Statistical downscaling model for late-winter rainfall over Southwest China

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Science China Earth Sciences 2015年第7期58卷 1827-1839页

作者： RUAN Chengq.ng LI JianPing feng Juan State Key.Laboratory.of Numerical Modeling for Atmospheric Sciences and Geophy.ical Fluid Dy.amics Institute of Atmospheric PhysicsChinese Academy of Sciences College of Earth Sciences University of Chinese Academy of Sciences College of Global Change and Earth Sy.tem Science Beijing Normal University Joint Center for Global Change Studies

A statistical downscaling model is built for the late-winter rainfall over Southwest China(SWC).A partial-correlation method is used for selecting *** results show that the selected factors for late-winter rainfall in SWC are sea level pressure in Western Europe(SNAO)and sea surface temperature in Western Pacific(WPT).SNAO is related to the southern pole of North Atlantic Oscillation(NAO)and excites Southern Eurasian teleconnection,which influences the development of the southern branch trough and the water vapor transport to *** indicates the variability.of ENSO in the tropical Western *** excites Pacific-East Asia teleconnection and an anticy.lone(cy.lone)is formed in the southern part of China and suppresses(enhances)rainfall over SWC.A regression statistical downscaling model using SNAO and WPT shows good performance in fitting the variability.of late-winter rainfall in the whole SWC region and every.observation station,and the model also shows strong robustness in the independent *** statistical model can be used for downscaling output from seasonal forecast numerical models and improve the SWC late winter rainfall prediction in the future.

关键词： statistical downscaling Southwest China late-winter rainfall partial correlation

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