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FUTURE OF APPLIED STEREOLOGY IN MATERIALS science AND ENGINEERING

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FUTURE OF APPLIED STEREOLOGY IN MATERIALS SCIENCE AND ENGINE...

Evidence for existence of a close association between CD14 and CXCR4 on monocytic cell line U937

第十三届国际体视学大会

作者： Guoquan Liu~(1 2) 1.school of Materials science and Engineering University of science and Technology beijing beijing 100083 china 2.State Key Laboratory for Advanced Metals and Materials University of science and Technology beijing beijing 100083 china

＜正＞It has been well demonstrated that materials science cannot evolve into a truly quantitative science without stereology（Robert *** Coming of Materials ***:Elsevier,2001;Liu,*** of Microscopy（Oxford）.1993,171（1） 57-68）.In this paper,the roles of stereology,and the future of the stereology in materials science and engineering will be reviewed and *** emphasis will be placed on what stereology can do and can not do as well as related precautions,and how stereology combines with newly developed 3D reconstruction,Thermocalc calculation,computer simulation,and so on,in order to serve the materials science and engineering better.

关键词： applied stereology materials science quantitative microscopy image analysis

来源： cnki会议评论

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Progress in Natural science:Materials International 2007年第8期17卷 979-982页

作者： Yang Hengwen Lan Canhui Chen Yinghua~(**) (Laboratory of Immunology,Department of Biology,Tsinghua University Protein science Laboratory of MOE,beijing 100084,china) [a]Laboratory of Immunology Department of Biology Tsinghua University Protein Science Laboratory of MOE Beijing China

The surface expression of HIV-1 coreceptors (CXCR4 and CCR5) on monocytes can be regulated by the ligand of CD14,and the susceptibility of the cells to HIV-1 is then *** previous study found that monoclonal antibody against CD14 could dramatically inhibit CXCR4-mediated chemotaxis and cell-cell *** on these studies,we explored potential relationship between CD14 and CXCR4 on monocytic cell line *** cytometry analysis showed that anti-CXCR4 monoclonal antibody (mAb) 12G5 strongly inhibited binding of the FITC-conjugated anti-CD14 monoclonal antibodies (TUK4 and UCHM1) to U937,while another CX- CR4-specific mAb B-R24 did not show any effect on this *** the other hand,two anti-CD14 monoclonal antibodies (TUK4 and UCH-M1) obviously inhibited the binding of the PE-conjugated anti-CXCR4 mAb 12G5 to U937 but did not inhibit the binding of mAb 12G5 to CXCR4-transfected 3T3 cells (***4),which indicates that the blocking of mAb 12G5 binding to CXCR4 by CD14- specific mAbs is not involved in the possibility that CD14-specific mAbs directly bind to *** results suggested existence of a close association between CD14 and CXCR4 on monocytic cell line U937.

关键词： CD14 CXCR4 cross-inhibition

Natural interdecadal weakening of East Asian summer monsoon in the late 20th century

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science Bulletin 2005年第17期 109-115页

作者： JIANG Dabang1, 2 & WANG Huijun1 1. Nansen-Zhu International Research Center, Institute of Atmospheric Physics, chinese academy of sciences, beijing 100029, china 2. Key Laboratory of Regional Climate-Environment Research for Tem-perate East Asia, chinese academy of sciences, beijing 100029, china

Based on the reanalysis data throughout 1948―2002 as derived from the United States National Centers for Environmental Prediction and National Center for Atmos-pheric Research, it is revealed that East Asian summer mon-soon (EASM) intensity weakens on an interdecadal timescale since the mid-1960s, and twice interdecadal jumps are re-corded in the EASM intensity index series in the late 20th century, respectively occurring in the mid-1960s and mid- to late 1970s. Six globally coupled atmosphere-ocean models’ outputs under the SRES A2 greenhouse gas and aerosol emission scenario, provided by the IPCC Data Distribution Center and the Hadley Center for Climate Prediction and Research, are then systematically examined. It follows that the above EASM weakening is not closely related to synchro-nizing anthropogenic global warming, and, therefore, it should be qualitatively natural change process. Over the 21st century, the EASM intensity is likely increased slightly by continually intensified greenhouse effect relative to the late 20th century.

关键词： East Asian summer monsoon interdecadal weakening global warming natural change.

木聚糖酶分子结构与重要酶学性质关系的研究进展

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生物工程学报 2005年第1期21卷 6-11页

作者：杨浩萌姚斌范云六中国农业科学院饲料研究所北京100081 中国农业科学院生物技术研究所北京100081

木聚糖是一种多聚五碳糖 ,是植物细胞中主要的半纤维素成分。木聚糖酶是可将木聚糖降解成低聚木糖和木糖的水解酶 ,它在饲料、造纸、食品、能源工业和环境科学上有着广阔的应用前景。随着分子生物学、结构生物学的发展及蛋白质工程的应... 详细信息

木聚糖是一种多聚五碳糖 ,是植物细胞中主要的半纤维素成分。木聚糖酶是可将木聚糖降解成低聚木糖和木糖的水解酶 ,它在饲料、造纸、食品、能源工业和环境科学上有着广阔的应用前景。随着分子生物学、结构生物学的发展及蛋白质工程的应用 ,对木聚糖酶结构和功能的研究不断深入。这里重点阐述与酶的活性、热稳定性、作用pH、等电点、底物亲和性及催化效率等重要性质相关的分子结构研究进展 ,讨论了其进一步的研究发展方向。研究木聚糖酶结构与功能的关系 ,对进一步加深木聚糖酶作用机制的了解、指导木聚糖酶的分子改良有重要意义。

关键词：木聚糖酶结构与功能催化残基热稳定性 pH性质底物亲和性

Tribological Performance of TiB_2-Ni Composite Coating Deposited by APS

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稀有金属材料与工程 2012年第S1期41卷 481-486页

作者： Zhu Hongbin,Li Hui,Li Zhuoxin beijing University of Technology,beijing 100124,china beijing Univ Technol Beijing 100124 Peoples R China

TiB2-Ni composite powders were prepared by pressurized hydrogen reduction cladding with different proportion of *** coatings were then prepared by *** microstructures and the phase composition of the powders as well as the deposited coatings were analyzed by scanning electron microscopy(SEM)and X-ray diffraction(XRD).The coatings were tested using a ring-on-disc tribometer from ambient temperature to 300°C.A sprayed Cr3C2-NiCr coating was tested as a *** morphologies of the worn surface of the coatings were observed and *** is found that the TiB2-Ni composite coatings present higher friction coefficient than that of the Cr3C2-NiCr coating at room temperature due to the adhesive wear mechanism,whereas the main wear mechanism of Cr3C2-NiCr coating is rupture and ***,at high temperature,the friction coefficient of the TiB2-Ni composite coating decreases as a result of B2O3 solid lubricant,which alleviates the adhesive wear on ***,the TiB2-Ni composite coating greatly reduces the mass loss of the boron cast iron.

关键词： TiB2-Ni composite coating APS wear behavior

Geochemistry of Trace and Rare Earth Elements in Red Soils from the Dongting Lake Area and Its Environmental Significance

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Pedosphere 2009年第5期19卷 615-622页

作者： MAO Long-Jiang MO Duo-Wen YANG Jing-Hong SHI Chen-Xi College of Atmospheric science Nanjing University of Information Science & Technology Nanjing 210044 (China) College of Urban and Environmental sciences Peking University Beijing 100871 (China) Department of Earth sciences Nanjing University Nanjing 210093 (China)

Trace element(TE) and rare earth element(REE) contents in red soils from the Dongting Lake area of china were determined to understanding the provenance and weathering characteristics of the red *** results showed similar REE distribution patterns among red soils from the Dongting Lake area,Xiashu loess from Zhenjiang,loess and Pliocene red soil from the Loess *** patterns implied a similar provenance from dust-storms,except for red soil R5 which formed by bedrock weathering and had significant light REE(LREE) enrichment and heavy REE(HREE) depletion due to longer weathering periods and higher intensity of *** element,especially the Rb/Sr and Li/Ba ratios,and REE,especially the LREE/HREE ratio and δEu could trace weathering *** Rb/Sr,Li/Ba,and LREE/HREE ratios and negative Eu anomalies were present in the red soils from the Dongting Lake *** weathering intensity was in the decreasing order of R5 in the Dongting Lake area > red soils from the Dongting Lake area(including reticulate red soil,weak reticulate red soil,and homogeneous red soil formed by dust storms) > Xiashu loess from Zhenjiang > loess-paleosol and Pliocene red soil from the Loess *** in the TE and REE contents of soil could be effectively used to study the provenance and the weathering intensity.

关键词： Hunan Province provenance sedimentary processes weathering intensity

MICROSTRUCTURE AND MAGNETIC HARDENING OF SINTERED NdFeB MAGNETS DOPPED WIHT Dy OR Dy_2O_3

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Acta Metallurgica Sinica(English Letters) 1992年第11期5卷 351-356页

作者： ZHOU Shouzeng ZHANG Jin MA Deqing GAO Maolin University of science and Technology beijing,beijing,china

The magnetic properties,microstructure and magnetic hardening of sintered (Nd_(1-x)Dy_x)_(16)Fe_(77.2)B_(6.8) and Nd_(16)Fe_(77.2)B_(6.8)+ywt-%Dy_2O_3 magnets have been stud- *** an addition of Dy to the magnet during smelting,Dy atoms may enter the matrix phase Nd_2Fe_(14)B,so as to enhance H_A,refine grains and improve boundary struc- ture,as well as to increase H_(ci)of the *** Dy_2O_3 is added to powder material prior to sintering,Dy atoms diffuse into the epitaxial layer of grains of matrix phase causing enhancement of K′_1,also refinement of grains and improvement of boundary *** NdFeB based permanent magnets with higher H_(ci) and greater(BH)_m may be produced by adding about 2—3 wt-% Dy_2O_3 which make a favourable condition for lower cost.

关键词： NdFeB magnet coercivity microstructure Dy Dy_2O_3

Motion behavior of particles in air-solid magnetically stabilized fluidized beds for separation

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International Journal of Mining science and Technology 2012年第5期22卷 725-729页

作者： Song Shulei a,,Zhao Yuemin a,Luo Zhenfu a,Tang Ligang b a school of Chemical Engineering and Technology,china University of Mining & Technology,Xuzhou 221116,china b Coal Mining and Designing Department,Tiandi science & Technology Company Co.Ltd.,beijing 100013,china [a] school of Chemical Engineering and Technology China University of Mining & Technology Xuzhou 221116 China [b] Coal Mining and Designing Department Tiandi Science & Technology Company Co. Ltd. Beijing 100013 China

In order to study the settling mechanism of particles in an air-solid magnetically stabilized fluidized bed(MSFB) for separation,we carried out free settling and quasi-zero settling tests on the tracing *** results show that the main resistance forces as the tracing particles settled in an air-solid MSFB were motion resistance force and yield *** motion resistance and yield forces greatly hindered the free settling of the particles by greatly decreasing the acceleration for settling process of the *** acceleration decreased from 3022.62 cm/s 2 to zero in 0.1 s,and in the end,the particles stopped in the air-solid *** yield force on particles increased with increasing the magnetic field intensity,resulting in decrease of the quasi-zero settling ***,the yield force on particles decreased with increasing the fluidized air velocity,leading to increase of the quasi-zero settling *** the structure and operating parameters of the air-solid MSFB were set up,the yield stress on particles stopped in an air-solid MSFB was a function of diameter and density of *** settling displacements of equal diameter particles increased with increasing their densities,and the settling displacements of equal density particles increased with increasing their diameters.

关键词： Air-solid MSFB Free settling Quasi-zero velocity settling Motion of particles

Discovery of Paleogene marine stratum along the southern side of Yarlung-Zangbo suture zone and its implications in tectonics

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science china Earth sciences 2005年第5期48卷 647-661页

作者： LI Guobiao 1 , WAN Xiaoqiao 1 , LIU Wencan 1 , LIANG Dingyi 1 & Hyesu Yun 2 1. china University of Geosciences, beijing 100083, china 2. Chungnam National University, Daejon, 305-350, Korea 1. china University of Geosciences 100083 Beijing China 2. Chungnam National University 305-350 Daejon Korea

The Jiachala Formatiom is a new lithostratigraphic unit set up in this paper. This is the first report on the Paleogene marine sequences and microfaunas in Gyangze to the southern side of the Yarlung-Zangbo suture zone. On the basis of fossil abundance, species diversity, dominant species and first and last occurrences of key species, three dinoflagellate assemblages and three polynological assemblages were recognized in the Jiachala Formatiom. They are in ascending order as follows: Apectodinium quinquelatum-Apectodinium hyperacanthum, Cannin- gia chinensis-Palaeoperidinium pyrophorum and Cymatiosphaera reticulosa-Samlandia chla- mydophora dinoflagellate assemblages, and Arliaceoipollenites baculatus-Anacolosidites sub- trudens, Aglaoreidia cyclops-Pinuspollenites microinsigis, and Elaeangnacites asper-Ilexpol- lenites iliacus polynological Assemblages. According to the assemblages, the age of the Jiachala Formation is referred to Paleocene-early Eocene. The preliminary study on the Jiachala Forma- tion shows that this group of Paleogene deposits accumulated in an underfilled peripheral fore- land basin which was in response to the load of the crust thickening resulted from the Asia-India collision. The stratigraphic evidences provided by the evolution of foreland basin indicate that the India-Asia initional collision should occure near the Cretaceous/Paleogene boundary. The de- velopment and evolution of the southern Tibet foreland basin was under the control of the stress field from the subduct-collision between India and Asia and the structure pattern of the basement. The withering of Tethys Sea might occur after early Eocene in the Gyangze basin and should be after Priabonian of late Eocene in southern Tibet.

关键词： Paleogene marine strata, Jiachala Formation, microfossils, underfilled peripheral foreland basin, initional collision, Gyangze.