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Interface and properties of epoxy resin modified by elastomeric nano-particles

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Science china Chemistry 2005年第2期48卷 148-155页

作者： HUANG Fan1, LIU Yiqun1, ZHANG Xiaohong1, GAO Jianming1, SONG Zhihai1, TANG Banghui1, WEI Genshuan2.& QIAO Jinliang1 1. SINOPEC beijing Research Institute of Chemical Industry, beijing 100013,{2. 2. Institute of Applied Chemistry, College of Chemistry and Molecular Engineering, Peking university, beijing 100080,{2. Correspondence should be addressed to Qiao Jinliang (email: jqiao@***.) 1. SINOPEC beijing Research Institute of Chemical Industry 100013 Beijing China 2. Institute of Applied Chemistry College of Chemistry and Molecular Engineering Peking University 100080 Beijing China

Study on a new composite of epoxy resin/elastomeric nano-particles (ENP) is re- ported in this paper, which shows that, in comparison with pure epoxy resin and epoxy toughened with CTBN, the composites of epoxy resin/carboxylic nitrile-butadiene ENP and epoxy resin/styrene butadiene vinyl-pyridine ENP possess both higher toughness and heat resistance. Both ENPs used in the study have an average size of less than 100 nm. Study on the epoxy network’s morphology and interface properties suggests that due to the chemical reaction be- tween ENP and epoxy resin and more hydrogen bonds between nitrile groups of the rubber and hydroxyl groups of the epoxy resin, stronger interaction at the larger interface may lead to the observed excellent properties of the epoxy resin toughened with ENP.

关键词： elastomeric nano-particles, epoxy resin, carboxylic nitrile-butadiene rubber, styrene butadiene vinyl-pyridine rubber, interface.

Determining　the　Parameter　Region　of　L

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北京大学学报(自然科学版) 1996年第3期 34-47页

作者： 1) Feng\ Jianfeng (National Research Center for Intelligent Computing System, Department of Prob. and Stat., Peking university, beijing, 100871) Hong\ Pan (Institute of Biophysics, Chinese {2. of sciences, beijing, 100101)

给出了Ｌｉｎｓｋｅｒ网络出现有结构感受野的充要条件，对于给定的Ｓｙｎａｐｔｉｃ密度函数，参数（ｋ１，ｋ２）能产生感受野的区域介于两条平行直线之间，这两条平行直线之间的距离ｄ２～ｄ１由协方差矩阵ｑ所决定。作为上述一般性... 详细信息

给出了Ｌｉｎｓｋｅｒ网络出现有结构感受野的充要条件，对于给定的Ｓｙｎａｐｔｉｃ密度函数，参数（ｋ１，ｋ２）能产生感受野的区域介于两条平行直线之间，这两条平行直线之间的距离ｄ２～ｄ１由协方差矩阵ｑ所决定。作为上述一般性结果的一个应用，对于Ｂ－Ｃ层的Ｌｉｎｓｋｅｒ网络进行了具体分析。

关键词： Linsker网络吸引子感受野 Synaptic密度函数

Expression profiles and transactivation analysis of a novel ethylene-responsive transcription factor gene GhERF5 from cotton

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Progress in Natural Science:Materials International 2009年第5期19卷 563-572页

作者： Longguo Jin, Bo Huang, Hui Li, Jinyuan Liu Laboratory of Molecular Biology and MOE Laboratory of Protein Science, Department of Biological sciences and Biotechnology, Tsinghua university, {2. 100084. china [a]Laboratory of Molecular Biology and MOE Laboratory of Protein Science Department of Biological Sciences and Biotechnology Tsinghua University Beijing 100084 China

Plant AP2.EREBP transcription factors play important roles in plant development and in plant responses to biotic and abiotic stresses. A novel gene for ethylene-responsive element binding protein (EREBP), designated GhERF5, which encodes a protein of 2.5 amino acids, was isolated by RACE-PCR from cotton (Gossypium hirsutum) seedlings. Sequence alignment revealed that GhERF5 contains a typical AP2.ERF domain, and belongs to the B3 subgroup of the ERF subfamily. Particle bombardment assay showed that GhERF5 functions as an in vivo transcription activator in tobacco cells, and it is located in the nuclei of onion epidermis cells. Semi-quantitative RT-PCR revealed that the expression of GhERF5 was highly and rapidly induced when plants were treated with exogenous ethylene, abscisic acid (ABA), salt, cold and drought. Promoter analysis indicated that there are conserved cis-acting elements induced by these stresses in the 50-upstream region of the GhERF5 gene. These results suggest that the GhERF5 gene might play an important role in cotton response to ethylene, ABA and environmental stresses.

关键词： Ethylene-responsive element binding factor (ERF) Abiotic stresses Nuclear localization Transactivation Gossypium hirsutum

ROBUST NONPARAMETRIC REGRESSION BASED ON L_1-NORM AND B-SPLINES

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Systems Science and Mathematical sciences 1995年第2期8卷 187-192页

作者： SHI Peide(Department of Probability and Statistics, Peking university, beijing 100871,{2.)ZHANG Zhengjun(School Of Management,beijing university of Aeronautics and Astronautics,beijing 100083, china) 北京大学概率统计系北京北京航空航天大学管理学院北京

ＲＯＢＵＳＴＮＯＮＰＡＲＡＭＥＴＲＩＣＲＥＧＲＥＳＳＩＯＮＢＡＳＥＤＯＮＬ＿１－ＮＯＲＭＡＮＤＢ－ＳＰＬＩＮＥＳＳＨＩＰｅｉｄｅ（ＤｅｐａｒｔｍｅｎｔｏｆＰｒｏｂａｂｉｌｉｔｙａｎｄＳｔａｔｉｓｔｉｃｓ，Ｐｅｋｉｎｇ... 详细信息

ＲＯＢＵＳＴＮＯＮＰＡＲＡＭＥＴＲＩＣＲＥＧＲＥＳＳＩＯＮＢＡＳＥＤＯＮＬ＿１－ＮＯＲＭＡＮＤＢ－ＳＰＬＩＮＥＳＳＨＩＰｅｉｄｅ（ＤｅｐａｒｔｍｅｎｔｏｆＰｒｏｂａｂｉｌｉｔｙａｎｄＳｔａｔｉｓｔｉｃｓ，ＰｅｋｉｎｇＵｎｉｖｅｒｓｉｔｙ，Ｂｅｉｊｉｎ...

关键词： B-spline function L1-norm estimator TURBO nonparametric regression

Effects of different n-6/n-3 polyunsaturated fatty acid ratios on the expression of cytokine IL-15 in pigs

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Effects of different n-6/n-3 polyunsaturated fatty acid rati...

Mobility of heavy metals from tailings to stream waters in local zinc smelting activities contaminated site

生猪优质健康养殖关键技术国际学术研讨会

作者： Fengna Li~1 Yulong Yin~(1*) Yehui Duan~(1,2. Yinghui Li~(1,2. Huansheng Yang~(1,2. Juexin Fan~3 Shengping Wang~1 and Zhiqiang Liu~(1,2. (1 Laboratory of Agro-ecological Processes in Subtropical Region,Institute of Subtropical Agriculture,Chinese {4. of sciences,Hunan 4.012.,{2. 2.he graduate School of the Chinese {4. of sciences, beijing 10003.,{2. 3College of Animal sciences,Hunan Agricultural university,Changsha Hunan,4.012., china)

＜正＞Immune stimulation in the rearing environment results in the production of potent pro-inflammatory cytokines,which antagonize anabolic growth factors,and thus suppress *** n-3 polyunsaturated fatty acids（PUFA） can regulate several cytokines to reduce body inflammation ***（IL）—15 is a T-cell growth factor with a biological activity similar to *** experiment was conducted to investigate the effects of different n-6/n-3 PUFA ratios on the expression of inflammatory cytokine IL-15 in intestine of pigs.A total of ninety-six crossbred（Large White X Landrace） growing-finishing pigs（73.8±1.6 kg） were chosen and fed one of the following four isocaloric diets with different n-6/n-3 PUFA ratios:1:1,2.5:1,5:1 and 10:1,

关键词： polyunsaturated fatty acids n-6/n-3 ratio IL-15 inflammation pig

来源： cnki会议评论

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Acta Geochimica 2006年第S1期 41-42页

作者： Taoze LIU1,2., Yuangen YANG1, Bangyu LIU1,2., Xiangyang BI1,2., Feili LI1,2.1 State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese {4. of sciences, Guiyang 550002.{2. 2.graduate School of the Chinese {4. of sciences, beijing 10003.,{2.

Mn content of reservoir calcite cement: A novel inorganic geotracer of secondary petroleum migration in the tectonically complex Junggar Basin (NW china)

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Science china Earth sciences 2007年第12期50卷 1796-1809页

作者： CAO Jian1,HU WenXuan1,YAO SuPing1,ZHANG YiJie2.WANG XuLong3,ZHANG YueQian3,TANG Yong3 & SHI XinPu3 1 State Key Laboratory for Mineral Deposit Research,Department of Earth sciences,Nanjing university,Nanjing 2.0093,{2. 2.Research Institute of Exploration and Development,Petro{2.,beijing 100083,{2. 3 Research Institute of Exploration and Development,Petro{2. Xinjiang Oilfield Company,Karamay 834.00,{2. 1. State Key Laboratory for Mineral Deposit Research Department of Earth Sciences Nanjing University Nanjing 210093 China 2. Research Institute of Exploration and Development PetroChina Beijing 100083 China 3. Research Institute of Exploration and Development PetroChina Xinjiang Oilfield Company Karamay 834000 China

Electronic probe microanalysis(EPMA) results of reservoir calcite cement from fourteen core samples in the Junggar Basin show that Mn-content varies largely between different samples from below the detect limitation to 4.14.,while it displays a generally good correlation with oil-gas ***,therefore,likely indicates that concentration of the Mn-content of the calcite cement has a close rela-tion to the intensity of petroleum fluid charging during hydrocarbon secondary *** order to assess this hypothesis,oxygen and strontium isotopic measurements on sixteen calcite veins host in source sequences were carried out to investigate the feature of the oil-source petroleum *** results imply that during hydrocarbon generation and migration,deep hot fluid has dissolved volcanic minerals interlined between mudstone source *** Mn is a kind of typical trace element enriched in volcanic rocks,it is reasonable to conclude that the petroleum fluid formed in the source sequences would be ***,calcite cements precipitated from such Mn-rich petroleum fluid would be Mn-rich *** to the geologic chromatographic effect during migration along reservoir rocks,the decreasing of the Mn-content of the reservoir calcite cements indicates the migration ***,this novel geotracer was further successfully applied in the study of hydrocarbon migration in the Junggar Basin in combination with organic geochemical analyses during the hydrocarbon *** Mn content of the reservoir calcite cement appears promising as a novel inorganic geotracer for the petroleum *** paper represents a search for novel indicators of secondary petroleum migration in tectonically complex basins based on fundamentals of the reservoir fluid-rock interactions.

关键词： Petroleum migration, inorganic geochemistry, water-rock interaction, reservoir calcite cement, the Junggar Basin

Synchrotron Radiation Tomography for Reconstruction of Layer Structures and Internal Defects of Composite Materials

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Chinese Journal of Lasers 1999年第6期8卷 24-29页

作者： LI Xide (Department of Engineering Mechanics, Tsinghua university, beijing 100084.{2.)HU Xiaofang (Department of Modern Mechanics and Engineering, university of Science and Technology of{2., Hefei 2.002.,{2.) HU Yiguan KAN Ya (National Sy 清华大学工程力学系北京 100084 中国科学技术大学近代力学与工程系安徽合肥 230026 中国科学技术大学同步辐射国家实验室安徽合肥 230026 中国科学技术大学同步辐射国家实验室安徽合肥

Synchrotron radiation tomography has been used as a non intrusive technique to study layer structures and internal defects of composite materials with carbon aluminum fibers and boron carbon fibers. A rotatable platform, which is positioned in a vacuum chamber of a beam line, is used to hold specimens and to get multi directional scanning images. The scanning images are recorded on a PMMA film firstly by use of the single exposure method, resampled by a microscopic system, and reconstructed with computerized tomography to yield their three dimensional descriptions. This reconstruction makes it possible to identify different layers and structures of composite materials. Particularly the defects inside composite materials can also be detected and evaluated.

关键词： composite material synchrotron radiation computerized tomography reconstruction nondestructive evaluation

Study of Ultra-drying on Vigor and Physiological Characteristics of Lespedeza bicolor Seeds

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Chinese Forestry Science and Technology 2010年第2期9卷 56-61页

作者： LIU Yan1 LIU Guangquan1,2.3 LI Qingmei4.DUAN Xinfang5 HOU Longyu1 1. International Research and Training Center on Erosion & Sedimentation, beijing 10004., P.R. china 2. china Institute of Water Resources and Hydropower Research, beijing 10004., P.R. china 3. Northwest Agricultural and Forestry university, Yangling 712.00, P.R. china 4. Research Institute of Forestry, Chinese academy of Forestry, beijing 100091, P.R. china 5. Institute of New Forestry Technology, Chinese academy of Forestry, beijing 100091, P.R. china

Ultra-drying (in a desiccator with silica gel) and accelerated aging (50 oC, 30 d) of Lespedeza bicolor seeds from the arid and semiarid areas of northwest china were studied. The results showed that in the moisture content of seed ( 4.?70 g/kg), germination percentage and vigor indices had no significant differences; ultra-dried seeds had a stronger anti-aging ability than those with natural drying, and the best MC for the storage was 4. g/kg. Therefore, it was feasible to store L. bicolor seeds with ultra-dried moisture content.

关键词： ultra-drying germination percentage vigor index relative conductivity enzyme activity Lespedeza bicolor