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Search Results: 1 - 10 of 61303 matches for " MA Tian-hui "
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Study on the Near-infrared Absorption Properties of ZnGeP2 Single Crystals
XIA Shi-Xing, YANG Chun-Hui, ZHU Chong-Qiang, MA Tian-Hui, WANG Meng, LEI Zuo-Tao, XU Bin
无机材料学报 , 2010, DOI: 10.3724/sp.j.1077.2010.01029
Abstract: Zinc germanium phosphide crystals about 20mm×90mm were grown by using Bridgman techniques. The three measured crystal sheets with thickness 4.0mm were obtained from the tail, middle and top of single crystal ingot. The infrared absorption properties were studied according to the experimental and theoretical data. The results show that the transmitted intensity gradually increased from top to bottom of ZGP crystals, which is caused by the inhomogeneous distribution of different kinds of intrinsic point defect. The absorption spectra of donor defects and acceptor defect in ZGP crystals are calculated theoretically. It is found that the influence of acceptor defect on absorption spectra is stronger than that of donor defect.
Tribological Properties and Lubricating Mechanism of Two Dicarboxylic Acid Ammonium Salts as Water- Soluble Lubricating Additives
两种水溶性二元羧酸盐润滑油添加剂的摩擦学性能及润滑机理研究

YU Yi,MA Hai-bing,LI Jing,REN Tian-hui,
於薏
,马海兵,李晶,任天辉

摩擦学学报 , 2009,
Abstract: Two water-soluble lubricant additives,dodecenylsuccinic acid(DSA) ammonium salt and sulfurized dodecenylsuccinic acid(SDSA) ammonium salt were prepared from dodecenylsuccinic anhydride.Their tribological behaviors were examined by four-ball tester.The worn steel surfaces were investigated by scanning electron microscopy(SEM),and the chemistry of tribofilm and thermal film generated from SDSA ammonium salt was analyzed with X-ray absorption near-edge spectroscopy(XANES).The results show that the two compound...
人类基因组分析中新的分子工具-YAC YAC-The New Molecular Tool in the Analysis of Human Genome
朱天慧ZHU,Tian-Hui
遗传 , 1994,
Abstract: 通常用于DNA克隆的载体,如质粒、λ噬菌体载体cos质粒(cosmid)等,其容量50kb,对于多数基因或某些小的基因簇,这个容量是足够的。但对于人类基因组研究和某些大基因的克隆,这些载体就有相当的局限性。例如人类第Ⅷ因子基因编码凝血因子,它的缺陷可...
STRESS PARALLEL COMPUTING IN ROCK FAILURE PROCESS ANALYSIS SYSTEM
岩石破裂过程分析系统中的应力并行求解

ZHANG Yong-bin,TANG Chun-an,ZHANG Huai,LIANG Zheng-zhao,MA Tian-hui,YANG Tian-hong,
张永彬
,唐春安,张 怀,梁正召,马天辉,杨天鸿

岩石力学与工程学报 , 2006,
Abstract: Powerful and accurate computation is becoming one of the most important tools for rock failure process analysis and related rock engineering problems.It demands supercomputer or large-scale parallel computer and related software that can be run on them.Common personal computers(PC) and workstations are incapable when they are facing the accurate simulation of micro-scale crack formation and evolution in rocks and other different typs of materials,which requires terascale computing,even petascale super-computing in future.A parallel model of rock failure process analysis is proposed.This model is developed from serial version of rock failure process analysis(RFPA) directly,which has been presented before.Parallelism of finite element method(FEM) in stress module has been completed using discontinuous finite element method and domain decomposition parallel algorithms for parallelization of RFPA.Numerical test shows that the program is robust and possesses good scalability and pocketability.Stress analysis of tens of millions order linear equations has been finished within twenty five minutes on 32-node PC-cluster.
Developments of Point Defects in ZnGeP2 Crystals
ZnGeP2晶体点缺陷的研究进展

ZHU Chong-Qiang,YANG Chun-Hui,WANG Meng,XIA Shi-Xing,MA Tian-Hui,LU Wei-Qiang,
朱崇强
,杨春晖,王猛,夏士兴,马天慧,吕维强

无机材料学报 , 2008,
Abstract: ZnGeP2 is a nonlinear optical material which is useful for important applications in the infrared region. A serious limitation to the development of ZnGeP2-based applications is the presence of point defects in the crystals. The latest development of the point defects in ZnGeP2 is summarized in the paper. Firstly, the point defects are studied by electron paramagnetic resonance technique. The dominant point defects in ZnGeP2 are V-Zn acceptor, V0P and Ge+Zn donors, and their energy levels are E(V-Zn)=EC-(1.02±0.03)eV, E(V0P)=EV+(1.61±0.06)eV and E(Ge+Zn)=EV+(1.70±0.03)eV. In addition, the two defects V-3Ge and VPi are observed in electron irradiated and annealed ZnGeP2, respectively. Secondly, the point defects are studied simulatively by full-potential linearized muffin-tin orbital method. The results of the dominant defects and their energy levels are in agreement with the experimental evidences. However, there still exists difference between the theoretical simulation and the actual situation, some results are discrepant with the experimental conclusions. Therefore, it is important to investigate point defects by the combination of experiment and theory.
NUMERICAL ANALYSIS OF PATHWAY FORMATION OF GROUNDWATER INRUSH FROM FAULTS IN COAL SEAM FLOOR
含断层煤层底板突水通道形成过程的仿真分析

LI Lian-chong,TANG Chun-an,LIANG Zheng-zhao,MA Tian-hui,ZHANG Yong-bin,
李连崇
,唐春安,梁正召,马天辉,张永彬

岩石力学与工程学报 , 2009,
Abstract: 基于对断层形态、产状要素、力学性质复杂性及断层诱发突水机制的认识,针对承压水上采煤的含断层岩体水力学模型,通过有限元数值仿真再现了含断层煤层开采底板采动裂隙形成、断层活化到突水通道形成的全过程.通过对损伤演化、应力场和渗流场的解读,揭示开采扰动及水压驱动下完整底板由隔水岩层到突水通道的演化机制.数值分析结果显示:断层本身的物理力学性质及断层的产状要素,包括断距和倾角等,对煤层底板的相对安全性都具有重要的影响.最后结合现场地质、水文地质调查及数值仿真结果对一工程实例进行突水机制分析,为承压水上采煤底板突水的机制分析及防治提供一些新的认识.
Isolation, purification and structure of Cp-I toxin from Cryphonectria parasitica
寄生隐丛赤壳菌Cryphonectria parasitica致病毒素Cp-I的分离纯化和结构分析

HAN Shan,ZHU Tian-Hui,
韩珊
,朱天辉

菌物学报 , 2009,
Abstract: The strain of Cryphonectria parasitica was cultivated by liquid fermentation.The crude material with wilt-inducing activity to chestnut browse was obtained by using petroleum ether extracting method from the fermentation broth.Three compounds were obtained by means of silica gel column chromatography using mixed solution of V(chloroform):V(petroleum ether):V(alcohol) = 6:2:2 as eluent.The results showed the first compound(Cp-I) had higher wilt-inducing activity than the other two.The chemical formula of the...
Tetraaqua(1,10-phenanthroline)nickel(II) 3,6-dicarboxybicyclo[2.2.2]oct-7-ene-2,5-dicarboxylate
Yun-Yu Liu,Tian-Hui Wang,Zhi-Hao Wang,Yu-Jiang Zhuo
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809028190
Abstract: In the title compound, [Ni(C12H8N2)(H2O)4](C12H10O8), the NiII ion is six-coordinated by two N atoms from one phenanthroline ligand and by the O atoms of four water molecules in a distorted octahedral geometry. In the crystal, intermolecular O—H...O hydrogen bonds form an extensive three-dimensional network, which consolidates the crystal packing.
Preparation and Tribological Properties of Surface-modified Borate Magnesium Nanoparticles
HAO Li-Feng, LI Jiu-Sheng, XU Xiao-Hong, REN Tian-Hui
无机材料学报 , 2010, DOI: 10.3724/sp.j.1077.2010.01330
Abstract: To develop a potential substitute for sulfurized olefins, surface-modified borate magnesium nanoparticles (titled as T-MgBN) were synthesized. The composition and microstructures of the as-obtained samples were characterized by inductively coupled plasma atomic emission spectroscopy (ICP-AES), X-ray power diffraction (XRD) and transmission electron microscope (TEM). The results indicate that T-MgBN with the size of around 50 nm is amorphous, and the appearance is irregular sheet. The tribological properties of T-MgBN in base oil evaluated using four-ball tribometer show that T-MgBN has better tribological capacity in base oil than that of T321. SEM and XPS analysis of the worn surface prove that there exists a wear resistance film which contains depositions and tribochemical reaction products (B2O3, FeB, Fe2O3 and BN) on the worn surfaces.
Homo-binding character of LMO2 isoforms and their both synergic and antagonistic functions in regulating hematopoietic-related target genes
Wei Sun, Wen-Wen Shen, Shuang Yang, Fen Hu, Yang Gao, Yu-Huan Qiao, Tian-Hui Zhu
Journal of Biomedical Science , 2010, DOI: 10.1186/1423-0127-17-22
Abstract: In this study, the combination of MBP pulldown assay and mammalian two hybrid assay were used to confirm the homo-binding character of LMO2-L/-S isoforms. Luciferase reporter assay and Real-time PCR assay were used to detect expression levels and relative promoter activities of LMO2-L/-S isoforms. Co-transfection and Luciferase reporter assay were used to reveal the detailed regulatory pattern of LMO2-L/-S isoforms on their targets.Herein we report the homo-interaction character of LMO2-L and LMO2-S and their major difference in manner of regulating their target genes. Our results showed that LMO2-L and LMO2-S could only bind to themselves but not each other. It was also demonstrated that LMO2-L could either positively or negatively regulate the transcription of its different target genes, depending on the arrangement and strand location of the two elements GATA site and E-box, LMO2-S, however, performed constitutively transcriptional inhibiting function on all target genes.These results suggest that LMO2 isoforms have independent functions while there is no interaction between each other and they could play synergetic or antagonistic roles precisely in regulating their different genes involved in normal and aberrant hematopoiesis.LMO2 is a pivotal factor in promoting embryonic hematopoiesis as well as angiogenesis[1,2]. Lmo2 null mutation in mice leads to failure of yolk sac erythropoiesis and embryonic lethality around E10.5[1]. LMO2 also correlates to the onset of T cell leukemia[3-5]. The human lmo2 gene was firstly cloned from an acute T lymphocyte leukemia (T-ALL) patient with (11;14)(p13;q11) translocation[6], and its aberrant expression could be detected in a considerable percentage of T-ALLs[5]. The oncogenic property of LMO2 was also confirmed in transgenic mouse models[7] and in X-SCID patients treated with retrovirus-mediated gene therapy, in which T-ALL emerged due to the insertion of retroviral sequence that incurs aberrant expression of LMO2 [8].Early
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