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| 1 | Stochastic structural model of rock and soil aggregates by continuum-based discrete element method显示文摘This paper first presents a stochastic structural model to describe the random geometrical features of rock and soil aggregates. The stochastic structural model uses mixture ratio, rock size and rock shape to construct the microstructures of aggregates, and introduces two types of structural elements (block element and jointed element) and three types of material elements (rock element, soil element, and weaker jointed element) for this microstructure. Then, continuum-based discrete element method is used to study the deformation and failure mechanism of rock and soil aggregate through a series of loading tests. It is found that the stress-strain curve of rock and soil aggregates is nonlinear, and the failure is usually initialized from weaker jointed elements. Finally, some factors such as mixture ratio, rock size and rock shape are studied in detail. The numerical results are in good agreement with in situ test. Therefore, current model is effective for simulating the mechanical behaviors of rock and soil aggregates. | WANG Yuannian1, ZHAO Manhong1, LI Shihai1 & J.G. Wang21. Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China 2. Tropical Marine Science Institute, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260 | 2005 | Science China(Technological Sciences)2005，48，z1： | 21 |
| 2 | INFLUENCE OF PULSED MAGNETIC FIELD ON MICROSTRUC-TURES AND MACRO-SEGREGATION IN 2124 Al-ALLOY显示文摘The structures and macro-segregation of 2124 Al-alloy were studied when a pulsedmagnetic field (PMF) was applied during solidification. It is found through experi-ments that a remarkable change occurs in the solidification structures of 2124 Al-alloyunder pulsed magnetic field. The eutectic phase at grain boundaries change from thickcontinuous eutectic network to thin discontinuous one, and the distribution of soluteelements was also homogenized. The typical negative segregation phenomenon of Cu incommon solidification condition was restrained, and the segregation of Mg decreased. | C.Y.Ban,J.Z.Cui,Q.X.Ba,G.M.Lu and B.J.ZhangP.O. Box 317, The Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110004, China Manuscript received 10 October 2001 | 2002 | Acta Metallurgica Sinica(English Letters)2002，15，4： | 19 |
| 3 | Carbon and Strontium Isotopes of Late Palaeozoic Marine Carbonates in the Upper Yangtze Platform,Southwest China显示文摘238 marine carbonate samples were collected from seven sedimentary sections ofthe entire late Palaeozoic (Permian, Carboniferous and Devonian) in the Upper Yangtze Plat-form, southwest China. Based on the absence of cathodoluminescence and very low Mn (gener-ally<50 ppm) contents of the samples, it is thought that they contain information on the orig-inal sea water geochemistry. The results of isotopic analyses of these samples are presented interms of δ13C and 87Sr/86Sr ratios versus geological time. The strontium data, consistent withother similar data based on samples from North America, Europe, Africa and other areas inAsia, support the notion of a global consistency in strontium isotope composition of marinecarbonates. The strontium data exhibit three intervals of relatively low 87Sr/86Sr ratios in thelate Middle Devonian to early Late Devonian, Early Carboniferous and Early Permian, corre-sponding to global eustatic high sea level stands. The lowest 87Sr/86Sr ratio recorded in theLate Permian was probably caused by substantial basalt eruptions in the Upper Yangtze Plat-form at the time. Three corresponding periods of relatively high δ13C values at roughly the samethe intervals were caused by a relatively high rate of accumulation of organic carbon duringsea level rises at these times. The deposition of coal was probably responsible for the increaseof sea water δ13C at other times. The δ13C values drop dramatically near theDevonian/Carboniferous, Carboniferous/Permian and Permian/Triassic boundaries, con-sistent with other similar data, which further support the notion that geological time boundariesare associated with mass extinction and subsequent rejuvenation. | Huang Sijing and Zhou Shaohua State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology, Chengdu, 610059, Sichuan, China Geological Institute, University of Copenhagen, Oster Voldgade 10,DK-1350 Copenhagen K,Denmark | 1997 | Acta Geologica Sinica(English Edition)1997，71，3： | 11 |
| 4 | Hepatitis C virus in human B lymphocytes transformed by Epstein-Barr virus in vitro by in situ reverse transcriptase-polymerase chain reaction显示文摘AIM To study persistence and replication ofheltitis C virus (HCV) in patients' peripheralblood mononuclear cells (PBMC) cultured invitro.METHODS Epstein-Barr virus (EBV) was usedto transform the hepatitis C virus from a HCVpositive patient to permanent lymphoblastoidcell lines (LCL). Positive and negative HCV RNAstrands of the cultured cells and growth mediawere detected by reverse transcriptase-polymerase chain reaction ( RT-PCR ) eachmonth. Core and NS5 proteins of HCV werefurther tested using immunohistochemical SPmethod and in situ RT-PCR.RESULTS HCV RNA positive strands wereconsistently detected the cultured cells for oneyear. The negative-strand RNA in LCL cells andthe positive-strand RNA in supernatants wereobserved intermittently. Immunohistochemicalresults medicated expression of HCV NS3 and Cproteins in LCL cytoplasm mostly. The positivesignal of PCR product was dark blue and mainlylocalized to the LCL cytoplasm. The RT-PCRsignal was eliminated by overnight RNasedigestion but not DNase digestion.CONCLUSION HCV may exist and remainfunctional in a cultured cell line for a longperiod. | Ji Lin Cheng Bao Ling Liu Yi Zhang Wen Bin Tong Zheng Yan Bai Fang Feng Institute of Hepatology,Peoples Hospital,Medical Center of Beijing University,Beijing 10(X)44,China | 2001 | World Journal of Gastroenterology2001，7，3： | 11 |
| 5 | ANALYSIS ON THE BEHAVIOR OF PRECIPITATES IN ULTRA-THIN HOT STRIP OF PLAIN LOW CARBON STEEL PRODUCED BY COMPACT STRIP PRODUCTION显示文摘This paper investigated the mechanism of precipitation and its influence upon prop-erties of ultra-thin hot strips of low carbon steel produced by CSP techniques usingexperiment and thermodynamics theory. The experimental results show that thereare lots of fine and dispersive precipitates in microstructures. By analysis, most ofaluminum nitrides are in grains, while coexisted precipitates of MnS are along grainboundaries. Coexisted precipitates compose cation-vacancy type oxides such as Al2O3in the core, while MnS is at the fringe of surface. The precipitation behavior of AlNand MnS in the hot strip is studied by thermodynamic calculation. At last, implica-tions between strengthening effect and techniques are analyzed using obtained solubilityproducts. | H.Yu,Y.L.Kang,H.B.Dong,D.L.Liu and J.FuUniversity of Science and Technology Beijing, Beijing 100083, China Manuscript received 10 October 2001 in revised form 25 January 2002 | 2002 | Acta Metallurgica Sinica(English Letters)2002，15，4： | 11 |
| 6 | Medaka fish stem cells and their applications显示文摘Stem cells are present in developing embryos and adult tissues of multicellular organisms. Owing to their unique features, stem cells provide excellent opportunities for experimental analyses of basic developmental processes such as pluripotency control and cell fate decision and for regenerative medicine by stem cell-based therapy. Stem cell cultures have been best studied in 3 vertebrate organisms. These are the mouse, human and a small laboratory fish called medaka. Specifically, medaka has given rise to the first embryonic stem (ES) cells besides the mouse, the first adult testis-derived male stem cells spermatogonia capable of test-tube sperm production, and most recently, even haploid ES cells capable of producing Holly, a semi-cloned fertile female medaka from a mosaic oocyte created by microinjecting a haploid ES cell nucleus directly into a normal oocyte. These breakthroughs make medaka a favoring vertebrate model for stem cell research, the topic of this review. | YI MeiSheng1, HONG Ni1, LI ZhenDong1, YAN Yan1,2, WANG DanKe1, ZHAO HaoBin1,3 & HONG YunHan1,4* 1Department of Biological Sciences, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore 2Division of Bioengineering, School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore 637457, Singapore 3Hubei Key Laboratory of Genetic Regulation and Integrative Biology, School of Life Sciences, Huazhong Normal University, Wuhan 430079, China 4State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China | 2010 | Science China(Life Sciences)2010，53，4： | 10 |
| 7 | 多硝基芳烃静电火花感度与爆速的关系(英)显示文摘通过测定32 种多硝基芳烃的静电火花感度,建立了50 % 发火能量 E E S 与爆速平方值的关系式。该式不仅体现了 Evans Polanyi Semenov 关系,而且表明在起爆、初始分解或由静电火花引起的能量转换过程中多硝基化合物分子初始分裂时化学机理的同一性。但电火花能转至分子反应中心的方式还不甚清楚。 | Vladimr ZEMAN, Jir KO?, Svatopluk ZEMAN (Department of Theory and Technology of Explosives, University of Pardubice CZ-532 10 Pardubice,the Czech Republic) | 1999 | 含能材料1999，7，3： | 8 |
| 8 | 硝胺的静电火花感度与爆速的关系(英文)显示文摘通过测定12 种硝胺50 % 发火概率下的静电火花能EES,建立了EES与爆速平方值( D2) 的线性关系,以此可预估尚未合成的硝胺化合物,尤其是那些对硝胺化学有重要意义的化合物,如1硝基1氮杂乙烯、1,3二硝基1 ,3二氮杂环丁烷、1,3 ,5 ,7 ,9五硝基1 ,3 ,5 ,7,9五氮杂环癸烷等的EES。 | Vladimír ZEMAN, Ji rˇ í KO C ˇ?, Svatopluk ZEMAN (Department of Theory and Technology of Explosives,University of Pardubice, CZ-532 10 Pardubice, the Czech Republic) | 1999 | 含能材料1999，7，4： | 8 |
| 9 | Method Development of Enantiomer Separations by Affinity Capillary Electrophoresis,Cyclodextrin Electrokinetic Chromatography and Capillary Electrophoresis-Mass Spectrometry显示文摘Capillary electrophoresis (CE) has become a powerful tool for enantiomer separations during the last decade. Since 1993, the author has investigated enantiomer separations by affinity capillary electrophoresis (affinity CE) with some proteins and by cyclodextrin electrokinetic chromatography (CDEKC) with some charged cyclodextrins (CDs). Many successful enantiomer separations are demonstrated from our study in this review article. In the enantiomer separations by affinity CE, the deterioration of detection sensitivity was observed under high concentration of the protein in running solutions. The partial filling technique was practically useful to solve the serious problem. It allowed operation at high protein concentrations, such as 500 μmol/L, without the detection problem. Charged CDs had several advantages for the enantiomer separations over neutral ones. Strong electrostatic interactions between a charged CD and oppositely charged analytes should be effective for the formation of the complex. A large difference in electrophoretic mobility between the free analyte and the inclusion complex should also enhance the enantiomeric resolution. In CE mass spectrometry (CE MS), the partial filling technique was applied to avoid the introduction of nonvolatile chiral selectors into the CE MS interface. By replacing the nonvolatile electrolytes in the running buffer by volatile ones, the separation conditions employed in CE with the UV detection method could be transferred to CE MS. | TANAKA Yoshihide (Department of Analytical Chemistry, Nippon Boehringer Ingelheim Co. Ltd., 3 10 1, Yato, Kawanishi, Hyogo 666 0193, Japan) | 2002 | 色谱2002，20，4： | 8 |
| 10 | 科技兴体战略对策研究显示文摘在广泛调查研究的基础上,分析、论证了'科技兴体'战略方针的理论基础,重点提出90年代乃至下世纪初实施'科技兴体'战略的总体框架和现阶段实施方案及对策。文章把'科技兴体'战略对策系统分为5个层次。首先,确立'科技兴体'战略的理论基础和内涵,然后提出对策的3项原则,并在这些原则指导下,根据体委对体育的战略目标和体育科技的长远规划、确定4项'科技兴体'战略目标,最后提出4项基本战略措施和22条建议。 | 熊斗寅 蔡俊五 胡利军 李力研 李卫东 施云南 张立 都娟 吴涛 北京、上海、广东、辽宁、天津、四川、河南、江苏、贵州、新疆等10省、区、市体委课题组 | 1994 | 体育科学1994，14，2： | 7 |
| 11 | A THIRD-ORDER BOUSSINESQ MODEL APPLIED TO NONLINEAR EVOLUTION OF SHALLOW-WATER WAVES显示文摘The conventional Boussinesq model is extended to the third order in dispersion and nonlinearity. The new equations are shown to possess better linear dispersion characteristics. For the evolution of periodic waves over a constant depth, the computed wave envelops are spatially aperiodic and skew. The model is then applied to the study of wave focusing by a topographical lens and the results are compared with Whalin′s (1971) experimental data as well as some previous results from the conventional Boussinesq model. Encouragingly, improved agreement with Whalin′s experimental data is found. [WT5”HZ] | Zhang Ying long CCM MINDEF, Department of Mech. and Prod. Eng., National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260 Zhu Song ping Department of Mathematics, the University of Wollongong, Wollongong, NSW 2522, Australia | 2000 | Journal of Hydrodynamics2000，12，2： | 7 |
| 12 | Astudyofanewretrievalalgorithmformeasurementofoceanicwindvectorsfieldusingsatellitemicrowavescatterometer显示文摘AstudyofanewretrievalalgorithmformeasurementofoceanicwindvectorsfieldusingsatellitemicrowavescatterometerLinMingsen,SunYing,Z... | Lin Mingsen Sun Ying Zheng Shuqing(Received February 10, 1997 accepted June 9, 1997) | 1998 | Acta Oceanologica Sinica1998，17，3： | 6 |
| 13 | On Extension of Isometries in (F)-Spaces | Ding Guanggui Huang Senzhong Department of Mathematics Nankai University Tianjin, 300071 China Department of Mathematics University of Iowa Iowa City IA 52242 USA Department of Mathematics Nankai University Tianjin, 300071 China Mathematisehes Institut Universitat Tubingen Auf der Morgenstelle 10 72076 Tubingen Germany | 1996 | Acta Mathematica Sinica,English Series1996，12，1： | 5 |
| 14 | Experimental research into the two-proton emissions from ^(17,18) Ne,^(28) P and ^(28,29)S显示文摘Two-proton emissions from the excited states of 17,18Ne, 28P and 28,29S were investigated experimentally by the radioactive beams bombarding on the 197Au target via the Coulomb excitation. The complete-kinematics measurements were actualized by the stacks of silicon-strip detectors and CsI+PIN array detectors. The invariant mass of final systems as well as the relative momentum, opening angle, and relative energy of the two emitted protons was reconstructed under the framework of relativ istic kinematics. Visible proton-proton correlations were observed in these systems. The mechanisms of two-proton emission were analyzed in a simple schematic model, in which the extreme decay modes like He cluster emission, three-body 2 phase-space decay, and two-body sequential decay were taken into account. With the help of Monte-Carlo simulations, the two protons emitted from the 6.15 MeV excited state of Ne and the excited states in the energy region of 9.6–10.4 MeV of S, 18 29 respectively, exhibited prominent features of2 He cluster decay while for the other cases, no obvious diproton emissions were observed. | LIN ChengJian1, XU XinXing1, JIA HuiMing1, YANG Feng1, JIA Fei1, WU ZhenDong1, ZHANG ShiTao1, LIU ZuHua1, ZHANG HuanQiao1, XU HuShan2, SUN ZhiYu2, WANG JianSong2, HU ZhengGuo2, WANG Meng2, CHEN RuoFu2, ZHANG XueYing2, LI Chen2, LEI XiangGuo2, XU ZhiGuo2, XIAO GuoQing2 & ZHAN WenLong2 1China Institute of Atomic Energy, P. O. Box 275(10), Beijing 102413, China 2 Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China | 2011 | Science China(Physics,Mechanics & Astronomy)2011，54，S1： | 4 |
| 15 | 加强社会管理创新 维护边疆少数民族地区稳定与发展--云南楚雄、大理、丽江三地社会管理创新调研显示文摘2010年12月19日至24日,国家行政学院第十期青干班云南调研组赴楚雄、大理、丽江三个地市州8个县(市)区进行了调研。调研组在楚雄、大理、丽江三地召开了三个座谈会,并实地走访考察了楚雄彝族移民新村、丽江古城区新华社区、光义社区等地,对三地市州的社会管理创新工作进行了深入调查和了解。三地在社会管理创新方面有一些值得推广的做法和经验,为维护西南边疆社会稳定做出了积极探索与贡献。 | 国家行政学院第10期青干班赴云南调研组 赵立地 程萍 田凯 | 2011 | 行政管理改革2011，，5： | 3 |
| 16 | Phylogenetic relationship of Podocopida (Ostracoda: Podocopa) based on 18S ribosomal DNA sequences显示文摘Nucleotide sequences from 18S rDNA of 11 ostracodes, which represent four suborders and six superfamilies of podocopidan, were determined. The phylogenetic relationships were analyzed based on three kinds of methods (maximum-likelihood, maximum-parsimony, and neighbor-joining), and the three topologies gained were basically similar. The results have showed that (1) a monophyletic Podocopida was supported strongly; (2) the phylogenetic relationships of four suborders were (Darwinulocopina plus (Bairdiocopina plus (Cytherocopina plus Cypridocopina))), which indicated that a close relationship between Cytherocopina and Cypridocopina, and Darwinulocopina had separated early from the main podocopinan; (3) Cypridocopinan formed a monophyletic group, among which the phylogenetic relationship of three superfamilies was (Cypridoidea plus (Macrocypridoidea plus Pontocypridoidea)). | YU Na1, ZHAO Meiying1, CHEN Liqiao1*, YANG Pin11. School of Life Science, East China Normal University, Shanghai 200062, ChinaReceived 10 December 2005 accepted 11 February 2006 | 2006 | Acta Oceanologica Sinica2006，25，2： | 3 |
| 17 | STUDY OF ELECTROMAGNETIC STIRRING REFINING MICRO-STRUCTURES OF PIPE-LINE STEEL SAW DEPOSITS显示文摘The effects of electromagnetic stirring on the microstructures of pipe-line steel SAWdeposited metal were investigated. The results showed that electromagnetic stirringincreased the number density of inclusions with 0.2-0.6μm in diameter and promotedthe formation and refining of acicular ferrite within austenite grains. The low tem-perature toughness of deposited metal was improved. | Y.Zhang,B.N.Qian and X.M.Guo Shenyang University of Technology, Shenyang 110023, China State Key Laboratory of Corrosion and Protection, Institute of Metal Research, The Chinese Academy of Sciences, Shenyang 110016, ChinaManuscript received 10 October 200 | 2002 | Acta Metallurgica Sinica(English Letters)2002，15，4： | 3 |
| 18 | TEX——一种低易损炸药(英文)显示文摘根据低易损弹药 (LOVA)的分类就合成新炸药和复合炸药的问题进行了扼要分析 ,并对一些已知的炸药特性进行了讨论。认为 4 ,10 二硝基 4 ,10 二氮杂 2 ,6 ,8,12 四氧四环 [5.5.0 .0 5,9.0 3,1 1 ]十二烷 (TEX)是一种LOVA炸药 ,但是至今未见其广泛应用的报道 ,本文试图对炸药的现状及未来的发展寻找一种可能的解释。 | Jirˇí V?GENKNECHT (Department of Theory and Technology of Explosives,University of Pardubice,CZ 532 10 Pardubice) | 2000 | 含能材料2000，8，2： | 3 |
| 19 | Heavy ion reactions around the Coulomb barrier显示文摘The angular distributions of fission fragments for the 32S+184W reaction near Coulomb barrier energies are measured. The ex perimental fission excitation function is obtained. The measured fission cross sections are decomposed into fusion-fission, quasi-fission and fast fission contributions by the dinuclear system (DNS) model. The hindrance to completing fusion both at small and large collision energies is explained. The fusion excitation functions of 32S+90,96Zr in an energy range from above to below the Coulomb barrier are measured and analyzed within a semi-classical model. The obvious effect of positive Q-value multi-neutron transfers on the sub-barrier fusion enhancement is observed in the 32S+96Zr system. In addition, the excitation functions of quasi-elastic scattering at a backward angle have been measured with high precision for the systems of 16O+208Pb, 196Pt, 184W, and 154,152Sm at energies well below the Coulomb barrier. Considering the deformed coupling effects, the extracted diffuseness parameters are close to the values extracted from the systematic analysis of elastic and inelastic scattering data. The elastic scattering angular distribution of 17F+12C at 60 MeV is measured and calculated by using the continuum-discretized coupled-channels (CDCC) approach. It is found that the diffuseness parameter of the real part of core-target potential has to be increased by 20% to reproduce the experimental result, which corresponds to an increment of potential depth at the surface re gion. The breakup cross section and the coupling between breakup and elastic scattering are small. | ZHANG HuanQiao1, LIN ChengJian1, JIA HuiMing1, ZHANG ChunLei1,2, ZHANG GaoLong1,3, YANG Feng1, LIU ZuHua1, AN GuangPeng1, WU ZhenDong1, XU XinXing1 & JIA Fei1 1 China Institute of Atomic Energy, P. O. Box 275(10), Beijing 102413, China 2 Particle Astrophysics Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, China 3 School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China | 2011 | Science China(Physics,Mechanics & Astronomy)2011，54，S1： | 3 |
| 20 | CONVERGENCE OF CASCADE ALGORITHMS AND SMOOTHNESS OF REFINABLE DISTRIBUTIONS显示文摘In this paper, the author at first develops a method to study convergence of the cascadealgorithm in a Banach space without stable assumption on the initial (see Theorem 2.1), andthen applies the previous result on the convergence to characterizing compactly supportedrefinable distributions in fractional Sobolev spaces and Holder continuous spaces (see Theorems3.1, 3.3, and 3.4). Finally the author applies the above characterization to choosing appropriateinitial to guarantee the convergence of the cascade algorithm (see Theorem 4.2). | SUN QIYU Department of Mathematics, University of Houston, Houston, TX 77204, USA. Department of Mathematics, National University of Singapore, 10 Kent Ridge Crescent, 119260, Singapore. | 2003 | Chinese Annals of Mathematics,Series B2003，24，3： | 3 |
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