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Chinese Science Bulletin 1998年第1期43卷 72-75页

作者： CHEN Jun\+1, JI Junfeng\+1, SU Yuanxia\+2.and LU Huayu\+31. Department of Earth Sciences, nanjing univ.r.ity, nanjing 210093,{2. 2. center of material analysis, nanjing univ.r.ity, nanjing 210093,{2. 3. Xi’an Laboratory of Loess and Qu Department of Earth Sciences Nanjing University Nanjing China center of material {2. Nanjing University Nanjing China Xi’an Laboratory of Loess and Quaternary Geology Chinese Academy of Sciences Xi’an China

Mn 2. EPr intensity recorded in the Chinese loess_paleosol sequence shows close correlation with magnetic susceptibility and Sr content as well as the oscillation of paleoclimate. Thus Mn 2. EPr signal can serve as an... 详细信息

关键词： paleomonsoon loess paleosol EPr signal of Mn 2.

Molecular dynamics simulation study on zwitterionic structure to maintain the normal conformations of Glutathione

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Science china Chemistry 2007年第5期50卷 660-664页

作者： YAN Han1, ZHU HaoMiao2.& SHEN Jian1,2.1 Jiangsu research center of Surface and Interface Chemical Engineering and Technology, nanjing univ.r.ity,{2., china 2.Jiangsu Engineering research center for Bio-medical function materials, nanjing Normal univ.r.ity, nanjing 2.0097, china Jiangsu research center of Surface and Interface Chemical Engineering andTechnology Nanjing UniversityNanjing 210093China Jiangsu Engineering research center forBio-medical function materials Nanjing Normal UniversityNanjing 210097China

Molecular dynamics simulations were applied to normal conformational Glutathione (GSH) and GSH over zwitterionic and hydrophobic surfaces respectively. Conformational analysis of GSH during the simulation time on rMSD, conformational flexibility and dihedral distribution were performed. The re- sults showed that zwitterionic structure maintains the normal conformations of GSH to a better extent, which should be a first good proof of the hypothesis of "maintain of normal structure".

关键词： protein-surface interactions, molecular dynamics simulation, zwitterionic structure, Glutathione, conformational changes, antithrombotic material

Game model of safety monitoring for arch dam deformation

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Science china(Technological Sciences) 2008年第S2期51卷 76-81页

作者： SU HuaiZhi1,2.WU Zhongru1,2.GU YanChang1,2.HU Jiang1 & WEN ZhiPing3 1 College of Water Conservancy and Hydropower Engineering,Hohai univ.r.ity,nanjing 2.0098,{2. 2.National Engineering research center of Water resources Efficient Utilization and Engineering Safety,nanjing 2.0098,{2. 3 Department of Computer Engineering,nanjing Institute of Technology,nanjing 2.0013,{2. College of Water Conservancy and Hydropower Engineering Hohai University Nanjing 210098 China National Engineering research center of Water resources Efficient Utilization and Engineering Safety Nanjing 210098 China Department of Computer Engineering Nanjing Institute of Technology Nanjing 210013 China

Arch dam deformation is comprehensively affected by water pressure,temperature,dam's structural behavior and material properties as well as other *** them the water pressure and temperature are external factors(source factors) that cause dam deformation,and dam's structural behavior and material properties are the internal factors of deformation(resistance factors).The dam deformation is the result of the mutual game playing between source factors and resistance ***,resistance factors of structure and materials that reflect resistance character of arch dam structure are introduced into the traditional model,where structure factor is embodied by the flexibility coefficient of dam body and the maximum dam height,and material property is embodied by the elastic modulus of *** the basis of analyzing the correlation between dam deformation and resistance factors,the game model of safety monitoring for arch dam deformation is put forward.

关键词： arch dam deformation monitoring model flexibility coefficient game theory

Preparation of Compound Ultrafine CeO2.by Wet-Solid-Phase Mechanochemical Modification

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Journal of rare Earths 2004年第Z1期22卷 42-45页

作者： Gu Ziyin Chen Weifan（china National Special Superfine Powder Engineering research center,{2. of Science & Technology, nanjing 10094, china） Hu Pinggui Li Yongxiu Engineering research center for rare Earth Nanchang UniversityNanchang 330047 China 　　 Engineering Research Center for Rare Earth Nanchang UniversityNanchang 330047 China Engineering Research Center for Rare Earth Nanchang UniversityNanchang 330047 China

To satisfy practical requirements from industrial applications, an alternate route for synthesis compound ultrafine CeO2.powders by wet-solid-phase mechanochemical modification using industrial grade hydrated cerium carbonate as raw material was *** effect of modifier reaction percentage, reaction time, calcining temperature and modifier amount on particle size, density, suspensibility, and hardness of compound CeO2.powder was *** phase evolutions of preparation process were characterized by *** micrograph of the final product shows that compound CeO2.powders obtained are well-dispersed, spherically-shaped, uniformly-sized and submicron-sized *** method is readily available in raw material, low in cost, simple in process, and has great potential for *** compound CeO2.powders of different physical properties can be synthesized by controlling the above-mentioned influence factors in preparation process.

关键词： ultrafine compound CeO2 powder mechanochemical modification preparation rare earths

Effects of binders on the performance of electric double-layer capacitors of carbon nanotube electrodes

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Progress in Natural Science:materials International 2005年第5期15卷 453-457页

作者： LI Chensha1*, WANG Dazhi1, ZHANG Baoyou2. WANG Xiaofeng1, CAO Maosheng3 and LIANG Ji1(1. Department of Mechanical Engineering, Tsinghua univ.r.ity, Beijing 100084, china 2. {2. for analysis and Measurement, Harbin Institute of Technology, Harbin 150001, china 3. School of material Science and Engineering, Tsinghua univ.r.ity, Beijing 100084, china) Department of Mechanical Engineering Tsinghua University Beijing 100084 China center for analysis and Measurement Harbin Institute of Technology Harbin 150001 China School of material Science and Engineering Tsinghua University Beijing 100084 China

Polarizable electrodes of electric double layer capacitor (EDLCs) were made from carbon nanotubes. Effects of different binders, which are phenolic resin (PF) and polytetrafluoroethylene (PTFE), on the properties of polarizable electrodes are studied. results indicate that the microstructure, pore size distribution and specific capacitance of the electrodes with PTFE binder are superior to those electrodes with PF binder after carbonization. The suitable binder (PTFE) for carbon nanotubes electrodes is proposed.

关键词： carbon nanotubes electric double-layer capacitors phenolic resin polytetrafluoroethylene.

A new method of estimating the equivalent elastic modulus of rCCD

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Science china(Technological Sciences) 2007年第z1期50卷 136-143页

作者： GU ChongShi1,2., WU Yuan1, SU HuaiZhi1,2.& TANG LiHui1 1 College of Water Conservancy and Hydropower Engineering, Hohai univ.r.ity, nanjing 2.0098,{2. 2.National Engineering research center of Water resources Efficient Utilization and Engineering Safety, nanjing 2.0098,{2. College of Water Conservancy and Hydropower Engineering Hohai University Nanjing 210098 China National Engineering research center of Water resources Efficient Utilization and Engineering Safety Nanjing 210098 China

Based on the composite material mechanic theory, the analysis method for the equivalent elastic moduli which are parallel and vertical to the construction interface of rCCD is studied in this paper. The differences between the equivalent elastic moduli which are vertical to the construction interface of rCCD gotten from different methods are discussed in detail. The variation range of the equivalent elastic modulus which is vertical to the construction interface of rCCD is studied based on the principle of minimum complementary energy and the principle of minimum potential energy. The effect of the related influential factors on the equivalent elastic modulus is analyzed. The estimation formula of the equivalent modulus which is vertical to the construction interface of rCCD is proposed. The feasibil{2. of the approach proposed in this paper is analyzed through an example.

关键词： rCCD equivalent elastic modulus variation range estimation method

NMr STUDIES ON POLYETHEr-POLYUrETHANE ZWITTErIONOMErS——CHAIN STrUCTUrE AND PHASE SEPArATION

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Chinese Journal of Polymer Science 1986年第1期4卷 72-77页

作者：王源身郭鸣明 Department of Chemistry nanjing univ.r.ity nanjing Analytical center NMr group East china Normal univ.r.ity Shanghai china nanjing Institute of material Science Fudan univ.r.ity china.

The 1H and 13C NMr spectra of polyether-polyurethancs （A） based on 4, 4’-diphenylmethanediisocyanate （MDI）, N-methyl diethanolamine （MDEA）, and polytetramethyleneoxide （PTMO）and the zwitterionomers derived from A with various degree of ionization was assigned by comparingwith model compounds. Phase separation of the samples was visualized through pulsed NMr investigations. The FIDsignals of these multiphase elastomers were recorded and decomposed by non-linear least squaresregression into fast Gaussian and slow exponential components assodated with the hard, the soft andthe interface respectively. Thus pulsed NMr gives both qualitative and quantitative informationabout the existence of multiphases and the relative amounts of materials in each phase.

关键词： NMr STUDIES ON POLYETHEr-POLYUrETHANE ZWITTErIONOMErS CHAIN STrUCTUrE AND PHASE SEPArATION

The study of two-color excitation upconversion of Pr(0.5)Yb(3):ZBLAN

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Science china(Physics,Mechanics & Astronomy) 2006年第2期49卷 169-177页

作者： CHEN Xiaobo1 & SONG Zengfu2.1. Applied Optics Beijing Area Major Laboratory, analysis and testing center, Beijing Normal {2., Beijing 100875, china 2. Peking {2., Physics School, Beijing 100871, china Applied Optics Beijing Area Major Laboratory Analysis testing center Beijing Normal University Beijing 100875 China Physics School Peking University Beijing 100871 China

The excited state absorption upconversion of Pr(0.5)Yb(3):ZBLAN glass material, under two-color excitation of the 960 nm semiconductor laser and the Xe lamp light simultaneously, is reported in this article. It was found that the upconversion emission spectra of 480.1, 519.0, 601.9 and 631.8 nm coincide with the common emission spectra. Meanwhile, the upconversion-excitation spectrum has three obvious peaks under two-color excitation, and they respectively correspond to the 856.0 nm upconversion ex-citation transition [1G4(Pr3+)→1I6(Pr3+) and 1G4(Pr3+)→3P1(Pr3+)], the 789.0 nm upconver-sion excitation transition 1G4(Pr3+)→3P2.Pr3+), and the 803.7 nm upconversion excitation transition 3H6(Pr3+)→1D2.Pr3+). The upconversion excitation transition 1G4(Pr3+)→1I6(Pr3+) is strong because its oscillator strength f = 2..040×10?6 is large, which results in a large peak appearing in the upconversion excitation spectrum. That is just the new interesting two-color excitation upconversion luminescence phenomenon of Pr(0.5)Yb(3):ZBLAN induced by one laser and one continuous normal light simultaneously.

关键词： upconversion volumetric three-dimensional display two-color excitation.

CONSTrAINTS ON THE CrACK TIP PLASTIC FIELDS UNDEr LArGE SCALE YIELD

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Acta Mechanica Solida Sinica 2001年第2期14卷 138-146页

作者： Xu Fei~1 Guo Wanlin~(1,2. (1 State Key Laboratory of Mechanical Structure Strength and Vibration, Xi’an Jiaotong univ.r.ity, Xi’an 710049, china) (2.School of Aeronautics and Astronautics,{2. univ.r.ity of Aeronautics and Astronautics, {2. 2.0016, china) State Key Laboratory of Mechanical Structure Strength and Vibration Xl'an Jiaotong University，Xi'an 710049，China State Key Laboratory of Mechanical Structure Strength and Vibration Xl'an Jiaotong University，Xi'an 710049，China School of Aeronautics and Astronautics Nanfing University of Aeronautics and Astronautics，Nanjing 210016，China

Plane strain elastic-plastic finite element analyses are used tostudy the stress, strain fields around a straight crack in powerhardening plastic material. center crack panel (CCP), single edgecrack panel (SECP) and double edge crack panel (DECP) tensionspecimens are analyzed with various crack lengths. Two localconstraint parameters, i.e. in-plane stress ratio T_x andout-of-plane constraint T_z are an- alyzed, which are defined astangential stress dividing normal (open) stress and out-of-planestress dividing the sum of tangential stress and normal stressrespectively.

关键词： constraint in-plane stress ratio out-of-plane constraint

Effects of Multiple Plastic Deformations on Microstruc-ture and Mechanical Properties of 7A04-T6

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稀有金属材料与工程 2011年第S3期40卷 69-72页

作者： Zhang Zhimin1,2. Yu Jianmin1, Wang Qiang2. Zhang Xing 2.1 Engineering research center of Magnesium-base material Processing Technology, Ministry of Education, Taiyuan 030051,{2. 2.North univ.r.ity of{2., Taiyuan 030051,{2. Minist Educ Engn Res Ctr Magnesium Base Mat Proc Technol Taiyuan 030051 Peoples R China N univ china Taiyuan 030051 Peoples R China

The influences of multiple plastic deformations on microstructure and mechanical properties of 7A04-T6 alloy by isothermal compression experiments in different passes deformation on the 6300 kN extrusion press. The experimental results showed that the strength and elongation of 7A04-T6 alloy were increased firstly and then decreased as the deformation pass increases at above 400 ℃. The grains of 7A04-T6 alloy was refined firstly and then grow, the grain was become refinement after four deformations under this experimental conditions. The second phase η (MgZn2. in the matrix would precipitate after solution, precipitation strengthening taking place. It is obvious that the number of second phase which dissolve into the matrix will increase as the deformation pass increasing. So the tensile strength reached the highest after four deformations, is 590.9 MPa, yield strength is 532.5 MPa, and elongation is 12.4%. After four deformations of 7A04-T6 alloy, tensile fracture surface of samples was composed of the deep and uniform dimples, belonging to ductile fracture. Therefore, 7A04-T6 alloy has better comprehensive mechanical properties after four deformations.

关键词： 7A04 high-strength aluminum alloy multiple deformations T6 heat treatment