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A new elliptic-parabolic yield surface model revised by an adaptive criterion for granular soils

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Science china(Technological Sciences) 2010年第8期53卷 2152-2159页

作者： LIU HanLong 1,2 ,XIAO Yang 1,2 ,LIU JinYuan 3 &LI GuoYing 4 1 key laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai university, nanjing 210098,china 2 Geotechnical research Institute,Hohai university,nanjing 210098,china 3Department of Civil Engineering,Ryerson university,Toronto,Canada 4 Department of Geotechnical Engineering,nanjing Hydraulic research Institute,nanjing 210014,china 1. key laboratory of Ministry of Education for Geomechanics and Embankment Engineering Hohai University Nanjing 210098 China2. Geotechnical Research Institute Hohai University Nanjing 210098 China3. Department of Civil Engineering Ryerson University Toronto Canada4. Department of Geotechnical Engineering Nanjing Hydraulic Research Institute Nanjing 210014 China

An adaptive criterion for shear yielding as well as shear failure of soils is proposed in this paper to address the fact that most criteria,including the Mohr-Coulomb criterion,the Lade criterion and the Matsuoka-Nakai criterion,cannot agree well with the experimental results when the value of the intermediate principal stress parameter is too *** new criterion can adjust an adaptive parameter based on the experimental results in order to make the theoretical calculations fit the test results more *** original elliptic-parabolic yield surface model can capture both soil contraction and dilation ***,it normally over-predicts the soil strength due to its application of the Extended Mises criterion.A new elliptic-parabolic yield surface mode is presented in this paper,which introduces the adaptive criterion in three-dimensional principal stress *** new model can well model the stress-strain behavior of soils under general stress *** to the original model which can only simulate soil behavior under triaxial compression conditions,the new model can simulate soil behaviors under both triaxial compression conditions and general stress conditions.

关键词： principal stress space intermediate principal stress yield surface failure criterion constitutive model

Efficient Cleavage of DNA by the Novel Copper (II) Complex Derived From 2,2'-Pyridil Ligand

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Chinese Chemical Letters 2001年第6期12卷 495-496页

作者： Rui REN1,3, Pin YANG2 1Biotechnology laboratory, Shanxi university, Taiyuan 030006 2Institute of Molecular Science, Shanxi university, Taiyuan 030006 3state key laboratory of Coordination Chemistry, nanjing university, nanjing 210093 Shanxi Univ Biotechnol Lab Taiyuan 030006 Peoples R China Shanxi Univ Inst Mol Sci Taiyuan 030006 Peoples R China nanjing Univ State Key Lab Coordinat Chem Nanjing 210093 Peoples R China

Copper (II) complex derived from 2, 2'-pyridil ligand has been, demonstrated to cleave efficiently DNA at micromolar concentrations at room temperature and pH 7.25.

关键词： copper (II) complex DNA efficient cleavage

β-Cyclodextrin Facilitates the Cleavage of Cobalt-Carbon Bonds during the Electrochemical Reduction of Alkylaquabis(dimethylglyoximato)Cobalt(Ⅲ)

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Chinese Chemical Letters 1997年第9期8卷 801-802页

作者： Ying CHEN Lai Bin LUO Hui Lan CHEN Shi Min ZHU(Department of Chemistry, Coordination Chemistry Institute and Coordination Chemistry state key laboratory, nanjing university, nanjing, 210093) nanjing UNIV STATE KEY LAB COORDINAT CHEMNANJING 210093PEOPLES R CHINA nanjing UNIV DEPT CHEMINST COORDINAT CHEMNANJING 210093PEOPLES R CHINA

The electrochemical reduction of alkylaquabis (dimethylglyoximato)Cobalt(Ⅲ) in the absence and presence of β-Cyclodextrin (β-CD) was inveingated by means of cylic voltammetry. It was found that β-CD facilitates th... 详细信息

关键词： Cyclodextrin Facilitates the Cleavage of Cobalt-Carbon Bonds during the Electrochemical Reduction of Alkylaquabis dimethylglyoximato)Cobalt

Contourlet HMT model with directional feature

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Science china(Information Sciences) 2012年第7期55卷 1563-1578页

作者： WANG XiangHai 1,2,3 ,CHEN MingYing 1 ,SONG ChuanMing 1,2 ,XU MengChun 1 & FANG LingLing 3 1 College of Computer and Information Technology,Liaoning Normal university,Dalian 116029,china 2 state key laboratory for Novel Software Technology,nanjing university,nanjing 210093,china 3 Provincial key laboratory for Computer Information Processing Technology,Soochow university,Suzhou 215006,china 1. College of Computer and Information Technology Liaoning Normal University Dalian 116029 China2. State Key Laboratory for Novel Software Technology Nanjing University Nanjing 210093 China3. Provincial Key Laboratory for Computer Information Processing Technology Soochow University Suzhou 215006 China

According to Shanno's information theory,the directional feature of texture is defined as the value of directional variable when an image signal attains a singularity of random *** terms of this definition,we calculate the texture's directional features using Tamura's method and study the directional probability distribution of Contourlet *** we find that the directional features tend to be conveyed across parent and child *** on this conclusion,we establish a novel probability distribution model of hidden direction variables under the condition of hidden state variable's distribution,named Contourlet HMT model with directional *** structure and training method of the model are presented as ***,an unsupervised context-based image segmentation algorithm is proposed on the basis of the proposed *** effectiveness is verified via extensive experiments carried out on several synthesized images and remote sensing images.

关键词： directional feature Contourlet HMT Contourlet HMT with directional feature unsupervised texture segmentation

On the 3-rank of tame kernels of certain pure cubic number fields

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Science china Mathematics 2010年第9期53卷 2381-2394页

作者： LI YuanYuan & QIN HouRong Department of Mathematics,nanjing university,nanjing 210093,china 1. Department of Mathematics Nanjing University Nanjing 210093 China

In this paper,we present some explicit formulas for the 3-rank of the tame kernels of certain pure cubic number fields,and give the density results concerning the 3-rank of the tame *** examples are given in Tables 1 ... 详细信息

关键词： the 3-rank of the tame kernels pure cubic fields density

Discovery and analysis of ultra-micro grinding grain texture in slipping lamellae of ductile-brittle zone

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Science china Earth Sciences 2004年第3期47卷 265-271页

作者： GE Heping1, SUN Yan1, LU Xiancai1, ZHU Wenbin1, GUO Jichun1, LIU Deliang2 & Chi-yuen Wang3 1. Department of Earth Sciences, nanjing university, state key laboratory of mineral deposit, nanjing 210093, china 2. Department of Earth and Space Sciences, university of Science and Technology of china, Hefei 230026, china 3. Department of Geology and Geophysics, university of California, Berkeley, CA 94720, USA nanjing Univ Dept Earth Sci State Key Lab Mineral Deposit Nanjing 210093 Peoples R China Univ Sci & Technol china Dept Earth & Space Sci Hefei 230026 Peoples R China Univ Calif Berkeley Dept Geol & Geophys Berkeley CA 94720 USA

Based on the observation of the deep bore cores sampled from the state of Cali-fornia, USA, preferred arranged particulate concentration belts were found in the ultra-slipping lamellae. And the same phenomenon was found again later in the bore cores from the petroleum basin in the Northern Shaanxi Province. It may be the product of the dynamic processes involv-ing tumbling, grinding and compresso-shearing functions, so the spherical particulates with ul-tra-size of nm and mm are called grinding grain. The formation of the grinding grains is related with the ductile-brittle deformation, the lateral pressure of the slipping, and the very low grade of dynamic metamorphism of the rocks. Based on the systematic analysis, it is indicated that some elements like Nb and Ta are enriched in the grinding grains in the granitic rocks because of the chemical differentiation, and that the slipping lamellae bearing grinding grains in mudstone with smear efficiency prove a perfect seal for oil and gas reservoirs. Meanwhile, the paper provides bases for the studies on the fast stick-slip movement and shear paradigm.

关键词： slipping lamellae, grinding grain texture, ductile-brittle deformation, smear efficiency.

THE STUDY ON PHOSPHORUS RICH ZIRCON FROM THE YASHAN TOPAZ-LEPIDOLITE GRANITE, JIANGXI PROVINCE,SOUTH china

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南京大学学报(自然科学) 1999年第6期 121-124页

作者： Huang Xiaolong Wang Rucheng Liu Changshi ** Chen Xiaoming Zhang Wenlan Lai Mingyuan (state key laboratory of mineral deposit research, Department of Earth Sciences, nanjing university, 210093,nanjing,PRC)

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关键词： P rich zircon Al 3+ P 5+ Si 4+ 2 Substitution P 5+ Al 3+ Si 4+ -1 Zr 4+ -1 substitution

Mid-infrared laser with 1.2 W output power based on PPLT

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Science china(Physics,Mechanics & Astronomy) 2010年第4期53卷 638-642页

作者： Lü XinJie, ZHAO Gang, LI GuiJun, GAO ZhiDa, PAN ShuDi & ZHU ShiNing National laboratory of Solid state Microstructure, nanjing university, nanjing 210093, china 1. National laboratory of Solid state Microstructure Nanjing University Nanjing 210093 China

The optical parametric oscillator (OPO) based on the periodically poled lithium tantalate (PPLT) crystal (40 mm×5 mm×1 mm) is fabricated. The OPO is pumped by a Q-switched Nd:YAG laser working at 1.064 μm. An average idler output power (around 3.8 μm) of 1.2 W and signal output power (around 1.48 μm) of 3 W are obtained when the pump power is 20 W.

关键词： optical superlattice mid-infrared laser optical parametric oscillator (OPO) periodically poled lithium tantalate (PPLT)

Two new species of Vestrogothia (Phosphatocopina, Crustacea) of Orsten-type preservation from the Upper Cambrian in western Hunan, South china

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Science china Earth Sciences 2009年第6期52卷 784-796页

作者： ZHANG HuaQiao1,2 & DONG XiPing1,2 1 School of Earth and Space Sciences,Peking university,Beijing 100871,china 2 state key laboratory of Palaeobiology and Stratigraphy,nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,nanjing 210008,china School of Earth and Space Sciences Peking University Beijing 100871 China state key laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences Nanjing 210008 China

Although fossils of Orsten-type preservation represented by Skaracarida and Phosphatocopina were first reported from the Middle and Upper Cambrian in western Hunan, South china in 2005, diversified phosphatocopine species have never been appropriately described and elucidated in terms of their evolutionary relationships. Here, we described two new species of Phosphatocopina, Vestrogothia anterispinata sp. nov. and V. bispinata sp. nov. The evolutionary relationship among all the valid species of Phosphatocopina is discussed and the phylogeny of Phosphatocopina is reestablished using cladistic analysis. Accordingly, phosphatocopines primitively evolved along two lineages: one evolved towards the emergence of lobes; the other evolved towards the emergence of dorsal spines. Respectively, lobes originated independently three times, and dorsal spines originated only once. With regard to the dorsal rims, interdorsum originated first, whereas dorsal furrow originated independently twice on the basis of interdorsum. Probably Hesslandona may represent a polyphyletic group, whereas Vestrogothia a monophyletic group.

关键词： fossils of Orsten-type preservation Vestrogothia Phosphatocopina Crustacea evolution phylogeny Cambrian Hunan