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Zirconium-Induced Softening in Hyperstoichiometric Ni_3.l

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Journal of Materials Science & Technology 2005年第2期21卷 207-210页

作者： Yufang LI, Jianting GUO and Hengqiang YE institute of Metal Research, Chinese Academy of Sciences, shenyang 110016, china Inst. of Metal Res. Chinese Acad. of Sci. Shenyang 110016 China

The room temperature compressive properties and microhardness of Ni3.I alloys doped with Zr were studied. For the hypostoichiometric Ni3.I alloys, the compressive strength and microhardness increased with an increase in Zr content, while softening behavior induced by doping with a certain amount of Zr was observed in hyperstoichiometric Ni3.I alloy. Possible mechanisms for the softening effect were suggested.

关键词： Ni3.l Compressive properties Microhardness Softening

LOW CYCLE FATIGUE OF Cr-Mn-N STAINLESS STEEL

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Acta Metallurgica Sinica(English Letters) 1990年第3期3卷 183-187页

作者： XIA Yuebo WANG Zhongguang institute of Metal Research,Academia Sinica,shenyang,china XIA Yuebo,Associate Professor,institute of Metal Research,Academia Sinica,shenyang 110015,china

An investigation was conducted to examine the low cycle symmetric push-pull fatigue behaviour of the Cr-Mn-N dual-phase stainless *** groups of specimens,A and B, were used,they were solution treated at 1050 and 12.0℃,*** life of group A is almost twice as long as that of group B under the same total strain *** energy loss during the fatigue tests and the mophology of the fracture surfaces have been stu- died and discussed.

关键词： low cycle fatigue fatigue life hardening saturation cyclic softening energy loss

Simulating　sensitivities　of　Changbai　Mountain　forests　to　potential　climate　change

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Journal of Environmental Sciences 1996年第3期8卷 354-366页

作者： Yan Xiaodong Zhao Shidong (institute of Applied Ecology. Chinese Academy of Sciences,shenyang 110015, china) institute of Applied Ecology Chinese Academy of Sciences Shenyang 110015 China

Changbai Mt. forest in the northeastern china is both a very important timber resource of china and one of the most typical and less disturbed temperate mixed evergreen coniferous-deciduous forest in the *** this paper, NEWCOP. a gap class model of forest growth and succession was proposed to simulate the sensitivity of the forest in Changbai Mountain to elevate CO_2. warmer temperature and precipitation change. NEWCOP was tested on long term simulation behaviors and short term fitting ability to field data. About the response of forests of Changbai Mountain to possible climate change, NEWCOP suggested that forest landscape go up within long term and forest biomass comes down within short term because of dieback of forest trees.

关键词： gap model climate change forests china.

Preparation and Characterization of Polyaniline Nanofibers by Template-free Method

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Journal of Materials Science & Technology 2005年第2期21卷 179-182页

作者： Xuemei GUO, Kun LUO and Nanlin SHI institute of Metal Research, Chinese Academy of Sciences, shenyang 110016, china Inst. of Metal Res. Chinese Acad. of Sci. Shenyang 110016 China

In the presence of p-toluene sulfonic acid (TSA) as a dopant, polyaniline (PAni) nanofibers, (about 80^-65 nm in diameter) were successfully synthesized with a chemical template-free method. It was found that the formation probability, morphology, and diameter of the resulting PAni-TSA nanofibers were sensitive to the synthetic conditions, such as reaction temperature, the molar ratio of TSA to aniline, and the concentration of TSA in the polymerization media. The molecular structure was characterized by using the FT-IR, Raman spectra and X-ray diffraction, which shows that the main chain structure of PAni-TSA nanofibers was in agreement with that of granular PAni.

关键词： Polyaniline p-toluene sulfonic acid Nanoflbers Template-free method

Structures and Properties of Nanocrystalline Nd_(4.5)Fe_(75)Co_1Si_1B_(18.5) Composite Magnets

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Journal of Materials Science & Technology 2000年第2期16卷 121-122页

作者： Wenli PEI, Fazeng LIAN and Guiqin ZHOU (Department of Materials Science and Engineering, Northeastern University, shenyang 110006, china) Jinguo LI (institute of Metal Research, Chinese Academy of Sciences, shenyang 110015, china) Department of Materials Science and Engineering Northeastern University Shenyang 110006 China institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China

In this article, the quenched Nd_4.5Fe_75Co_1Si_l B_18.5 ribbons were prepared, and the structures and properties were investigated. The results show that the change of structures of Nd_4.5 Fe_75 Co_1 Si_1 B_18.5 quenched amorphous ribbons is Am→Am'+Fe_3.+Nd_2Fe_23._3.Nd_2Fe_14B→Nd_2- Fe_14B when it is heated. The effect of crystallizing treatment temperature and time on the magnetic properties of the quenched alloy was studied. The magnetic properties of 16 m/s quenched ribbons for 710℃×12.0 s crystallizing treatment reach _iH_c=23..6 hA/m, B_r=0.8987 T and (BH)max=51.3. kJ/m^3. The grain size is about DFe3.3. nm and DNd2Fe14B=22 nm.

关键词： Composite Magnets Fe Structures and Properties of Nanocrystalline Nd Si

Temperature Dependent Work-hardening Behaviour in an Fe-Mn-Si-Cr-Ni Shape Memory Alloy

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Journal of Materials Science & Technology 1995年第4期11卷 304-306页

作者： Lijian RONG Yiyi LI and Changxu SHI (institute of Metal Research, Chinese Academy of Sciences, shenyang, 110015, china) Inst of Metal Research Chinese Acad of Sciences Shenyang China

The work-hardening behaviour in an Fe-Mn-Si-Cr-Ni alloy has been investigated using tensile test at different temperatures and TEM observation. It was found that besides the intersection of εmartensite, the intersections of ε martensite with stacking fault and the cross-slip of dislocation which is difficult to occur in the alloy with low stacking fault energy are also important factors to the temperature dependent work-hardening behaviour.

关键词： Work Mn Fe Temperature Dependent Work-hardening Behaviour in an Fe-Mn-Si-Cr-Ni Shape Memory Alloy Cr Si Ni

Rheological behaviour of semi-solid succinonitrile-camphor alloy

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Journal of University of Science and Technology Beijing 2003年第1期10卷 25-29页

作者： Zhenyao WangState Key Laboratory for Corrosion and Protection, institute of Metal Research, Chinese Academy of Sciences, shenyang 110016, china Lab. for Corrosion and Protection Inst. of Metal Res. Chinese Acad. of Sci. Shenyang 110016 China

Rheology experiments were carried out on succinonitrile-4% (mass fraction) camphor alloy, using a Haake VT550 viscometer. The results showed that the steady state viscosity of succinonitrile-4% camphor alloy in semi-solid process can be described well by the classical power law of viscosity versus shear rate, η= kγm, and the test method can be used to simulate the semi-solid processing for metals. The viscosity of the organic alloy decreases with increasing shear rate at a given temperature within liquid-solid range, and the viscosity of the organic alloy slurries increases with decreasing temperature, decreases with decreasing cooling rate. The structure and viscosity of organic alloy during solidification are strongly influenced by shear rate.

关键词： rheology semi-solid processing viscosity organic alloy microstructure

A Biomimetic Model of Fiber-reinforced Composite Materials

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Journal of Materials Science & Technology 1994年第1期10卷 34-38页

作者： Shihong LI Ronghui ZHANG Shaoyun FU Xin CHEN and Benlian ZHOU(institute of Metal Research, Academia Sinica, shenyang, 110015, china)Qiyun ZENG(institute of Applied Ecology, Academia Sinica, shenyang, 110015, china) Inst of Metal Research Shengyang China

In thjs paper. bamboo fiber has been. on micro scale. investigated as a helical. multi-layered hollow cylinder, the stiffness featu res of bamboo bast fiber were compared with those of a multifilament yarn in traditional fiber-reinforced composite materials, Moreover. a biomimetic model of the reinforce ment of fiber-reinforced composite materials was proposed by imitating the fine structure of bamboo bast fiber. The results show that the comprehensive stiffness properties of the cornplicated fine struc ture of bamboo fiber is superior over those of traditional fiber-reinforced composites.

关键词： Cl A Biomimetic Model of Fiber-reinforced Composite Materials

Immunoenhancing activity of protopanaxatriol-type ginsenoside-F3.in murine spleen cells

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Acta Pharmacologica Sinica 2004年第12期25卷 105-110页

作者： Jun-li YU, De-qiang DOU2, Xiao-hong CHEN, Hong-zhen YANG, Na GUO2,Gui-fang CHENG3. Department of Pharmacology, institute of Materia Medica, Chinese Academy of MedicalSciences, Peking Union MedicalCollege, Beijing 100050 Departmentof Natural ProductsChemistry, shenyang Pharmaceutical University, shenyang 110001,{3. 2 Department of Pharmacology Institute of Materia Medica Chinese Academy of Medical Sciences Peking Union Medical College Beijing 100050 China

AIM: To investigate the immunoenhancing activity of ginsenoside-F3.inmurine spleen cells andexplore itsmechanism. METHODS: The enhancing effect of ginsenoside-F3.on murine spleen cell proliferation was studied using [3.] thymidine incorporation assay. Effects of ginsenoside-F3.on the production of type 1 cytokines IL-2, IFN-γ, and type 2 cytokines IL-4 and IL-10 from murine spleen cells were detected by ELISA method. Effects of ginsenoside- F3.on mRNA level of cytokines IL-4, IFN-γ, and transcription factors T-bet and GATA-3.were evaluated by RT- PCR analysis. Effect of ginsenoside-F3.on NF-κB DNA binding activity in murine spleen cells was investigated by electrophoretic mobility shift assays (EMSA). RESULTS: Ginsenoside-F3.at 0.1-100 μmol/L not only promoted the murine spleen cell proliferation, but also increased the production of IL-2 and IFN-γ, while decreased the production of IL-4 and IL-10 from murine spleen cells with the maximal effect at 10 μmol/L. RT-PCR analysis displayed that ginsenoside-F3.enhanced the IFN-γ and T-bet gene expression and decreased IL-4 and GATA-3.gene expression. EMSA experiment showed that ginsenoside-F3.10 μmol/L enhanced the NF-κB DNA binding activity induced by ConA in murine spleen cells. CONCLUSION: Ginsenoside-F3.has immunoenhancing activity by regu- lating production and gene expression of type 1 cytokines and type 2 cytokines in murine spleen cells.

关键词： ginsenoside F3 immunity cytokines transcription factors