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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, China {2., nanjing univ.r.ity, nanjing 210093, China 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,China 2.National Engineering research {2. of Water resources Efficient Utilization and Engineering Safety,nanjing 2.0098,China 3 Department of Computer Engineering,nanjing Institute of Technology,nanjing 2.0013,China 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

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. center for {2. 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.

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.

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, China 2.National Engineering research {2. of Water resources Efficient Utilization and Engineering Safety, nanjing 2.0098, China 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

Preparation of Immobilized ε-Polylysine PET Nonwoven Fabrics and Antibacterial Activity Evaluation

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Journal of Wuhan univ.r.ity of Technology(materials Science) 2011年第4期26卷 675-680页

作者：郝丽梅杨荆泉 Institute of Medical Equipment the Academy of Military Medical Sciences National Bioprotection Engineering center

A novel antibacterial material （L-PET） was prepared by immobilizing ε-polylysine on polyethylene terephthalate （PET） nonwoven fabrics. Surface modifications of the fabric were performed by using a chemical modification procedure where carboxyl groups were prepared on the PET surface, a coupling agent was grafted, and the ε-polylysine was immobilized. Scanning electron microscopy （SEM） was used to analyze the surface morphology of the fabrics, while the toluidine blue method and X-ray photoelectron spectroscopy （XPS） were used to evaluate the grafting densities. The antibacterial activities of the L-PET were investigated by using the shaking-flask method. The electron micrographs showed that the surface of the blank PET and the modified fabrics did not change. The results of XPS analysis confirmed that ε-polylysine was successfully grafted onto the surface of PET. The results of the antibacterial experiments showed that L-PET fabrics had excellent antibacterial activ{2. against Escherichia coli and Staphylococcus aureus, and that L-PET fabrics were stable in storage for at least two years.

关键词： PET nonwoven fabric ε-polylysine immobilization antibacterial activity antibacterial material

An Experiment to Explain Depth of Cut Notch Wear of Ceramic Tools in Ni- based Super-alloy Machining

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厦门大学学报（自然科学版） 2002年第S1期41卷 86-87页

作者： WANG Zhi-gang 1, HE Ning 2.(1. Dept. of Mechanical Engineering, National univ.r.ity of Singapore, Singapore 2. Dept. of Mechanical Engineering, nanjing univ.r.ity of Aero.& Astro , Nanj ing 2.0016, China)

Inconel 718, a high temperature alloy, is extensive ly used in aircraft, gas engines and nuclear-power plants. It is generally known that the life of ceramic cutting tools in machining Inconel 718 is often restric ted by depth-of-cut (DOC) notch wear. In view of the number of various factors involved and the variety of tool materi als and cutting conditions available, the analysis of the DOC notch wear is very difficult. According to previous work concerning the DOC notch wear of ceramics tools, some Al 2. 3 - and Si 3N 4 -based ceramics tools have show n that the degree of tool notching depends on the thermal shock resistance of a tool material and thermal gradients (interrupted cutting, use of flood coolants) . Other observations suggest that there are chemical interactions between the to ol material and the work-piece. At the same time, an analytical technique based on thermodynamic properties for estimating cutting tool wear was proposed. Howe ver, so far, there is no concrete and convincing explanation for the DOC notch w ear. In all previous studies on the DOC notch wear, it is often assumed that notch we ar happened in the contacting region of the cutting tool and the work-piece, wh ile the exact position of notch wear is always neglected. In his article, He Ning measured the distance l n between tool nose and the center of DOC notch wear, and calculated the theoretical working length l d ― the ideal distance between the DOC notch center and the intersection of th e theoretical depth of cut line and the cutting edge. He found that l n is always greater than l d. It means that the position of the DOC notch is not at the depth of cut line, but out of the theoretical cutting area. He supposed that the saw-tooth shaped burrs and fin-shaped chip edges cause the DOC no tch wear, because only the saw-tooth shaped burrs and fin-shaped chip edges ha ve effect on the tools at the region of notch wear. Although He described the reason of notch wear and did some theoreti

关键词： notch wear ceramic tool high speed machining

Mechanical Property and Microstructural Characterization of C-Mn-Al-Si Hot Dip Galvanizing TrIP Steel

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Journal of Iron and Steel research International 2012年第8期19卷 29-36页

作者： JIANG Hai-tao1, DING Wei1,2. TANG Di1, HUANG Wei1 (1. National Engineering research center for Advanced rolling Technology, univ.r.ity of Science and Technology Beijing, Beijing 100083, China 2. School of {2. and Metallurgy, Inner Mongolia univ.r.ity of Science and Technology, Baotou 014010, Inner Mongolia, China) [a] National Engineering research center for Advanced rolling Technology University of Science and Technology Beijing Beijing 100083 China [b] School of material and Metallurgy Inner Mongolia University of Science and Technology Baotou 014010 Inner Mongolia China

Mechanical properties and microstructure in high strength hot dip galvanizing TrIP steel were investigated by optical microscope (OM), transmission electron microscope (TEM), X-ray diffraction (XrD), dilatometry and mechanical testing. On the heat treatment process of different intercritical annealing (IA) temperatures, isothermal bainitic transformation (IBT) temperatures and IBT time, this steel shows excellent mechanical properties with tensile strength over 780 MPa and elongation more than 2.%. IBT time is a crucial factor in determining the mechanical properties as it confirms the bainite transformation process, as well as the microstructure of the steel. The microstructure of the hot dip galvanizing TrIP steel consisted of ferrite, bainite, retained austenite and martensite during the short IBT time. The contents of ferrite, bainite, retained austenite and martensite with different IBT time were calculated. The results showed that when IBT time increased from 2. to 60 s, the volume of bainite increased from 14.31% to 16.95% and the volume of retained austenite increased from 13.64% to 16.2.%; meanwhile, the volume of martensite decreased from 7.18% to 1.89%. Both the transformation induced plasticity of retained austenite and the hardening of martensite are effective, especially, the latter plays a dominant role in the steel containing 7.18% martensite which shows similar strength characteristics as dual-phase steel, but a better elongation. When martensite volume decreases to 1.89%, the steel shows typical mechanical properties of TrIP, as so small amount of martensite has no obvious effect on the mechanical properties.

关键词： TrIP steel isothermal bainitic transformation martensite mechanical property

re-Os(ICP-MS)dating of the massive sulfide ores from the Jinchuan Ni-Cu-PGE deposit

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Science China Earth Sciences 2005年第10期48卷 1672-1677页

作者： YANG Gang1,2. DU Andao1, LU Jiren3, QU Wenjun1 & CHEN Jiangfeng2.1. National research center of Geoanalysis, Beijing 100037, China 2. Laboratory for Earth {2. Cycling, School of Earth and Space Sciences, univ.r.ity of Science and Technology of China, Hefei 2.002., China 3. Institute of Mineral resource, Chinese Academy of Geological Sciences, Beijing 100037, China National research center of Geoanalysis Beijing China Laboratory for Earth material Cycling School of Earth and Space Sciences University of Science and Technology of China Hefei China Institute of Mineral resource Chinese Academy of Geological Sciences Beijing China

Massive sulfide ore from the Jinchuan Ni-Cu-PGE deposit was dated by re-Os technique using Carius Tube digestion, Os distillation, re extraction by acetone and ICP-MS measurement. An isochron giving an age of 833 ± 35 Ma, initial 187Os/188Os ratio of 0.2.9 ± 0.018 (MSWD = 1.7) and γOs = 130 ± 15 is obtained. The re-Os age obtained agrees, within analytical uncertainties, with previous SHrIMP zircon U-Pb age of 82. ± 8 Ma (n=5, MSWD = 4.3). The result suggests that the deposit was formed at Neoproterozoic and that the formation of the Jinchuan Ni-Cu-PGE sulfide deposit may be closely related to the plume activity, which were attributed to the breakup of the rodinia supercontinent. The high γOs of the massive ores sug-gests that crustal material was involved in the formation of the Jinchuan deposit, however, the quantity of the added crustal material is less than 10%.

关键词： Jinchuan Ni-Cu-PGE deposit, re-Os dating, ICP-MS.