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research on stability of the accumulated rock-soil body of reservoir bank under rainfall condition

Science China(Technological Sciences) 2009年第9期52卷 2528-2535页

作者： GU ChongShi1,2,WU HaiZhen1,2 & SU HuaiZhi1,2 1 College of Water Resources and Hydropower Engineering,Hohai university,Nanjing 210098,China 2 National Engineering research center of Water Resources Efficient Utilization and Engineering Safety,Hohai university,Nanjing 210098,China 3.Jiangxi Water Conservancy research Institute,Nanchang 3.0029,China 1. College of Water Resources and Hydropower Engineering Hohai University Nanjing 210098 China 2. National Engineering research center of Water Resources Efficient Utilization and Engineering Safety Hohai University Nanjing 210098 China 3. Jiangxi Water Conservancy research Institute Nanchang 330029 China

The shear strength parameters property of rock-soil aggregates in embankment slope of reservoir,that is,the relationship between cohesion and gravel content,between friction angle and gravel content,and the relationship between cohesion and water content,between friction angle and water content,is studied based on the direct shear test results,the shear strength change law of the rock-soil aggregates is given,and the unsaturated shear strength formulation of rock-soil aggregates that could consider suction and saturation degree influence is put forward in this paper,through which the sliding or failure physical mechanism of this type of slope under the condition of rainfall infiltration is studied. Also the 3. unsteady saturated-unsaturated seepage field and its FEM resolving mode are established based on the analysis of the slope rainfall infiltration process. Case study with this method indicates that the minimum safety factor of the accumulated rock-soil aggregates dose not arrive at the moment of rainfall cessation,but appears several hours after the rainfall cessation,this phenomenon is in accordance with the practical slope engineering's failure process and could explain appropriately the slope failure caused by rainfall infiltration. research results in this paper have an important reference value for the research on stability of the accumulated rock-soil aggregates in embankment slope of reservoir,and can enrich the stability analysis method and relevant theory of reservoir embankment slope.

关键词： reservoir bank slope rock-soil aggregates rainfall infiltration saturated/unsaturated seepage

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Climate change tendency and grassland vegetation response during the growth season in Three-River Source Region

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Science China Earth Sciences 2010年第10期53卷 1506-1512页

作者： QIAN Shuan1,FU Yang2 & PAN FeiFei3.1 National Meteorological center,Beijing 100081,China 2 Qinghai Meteorological research Institute,Xining 810001,China 3.Department of Geography,university of North Texas,Denton,TX 76203.USA 1. National Meteorological center Beijing 100081 China2. Qinghai Meteorological Research Institute Xining 810001 China3. Department of Geography University of North Texas Denton TX 76203 USA

Climate change,climate suitablity change for grassland vegetation,and grassland response to climate change during the growth season are studied systematically by using meteorological data of temperature,precipitation,and length of sunlight from 1961 to 2007,NOAA/AVHRR NDVI from 1982 to 2006,and observations of grass height,biomass,and coverage in enclosed grassland from 1994 to *** models are developed to evaluate climate change and the climatic suitability of grassland vegetation *** temperature,accumulative precipitation,and length of sunlight during the growth season increased from 1961 to 2007 at rates of 0.24°C/10 yr,2.3. mm/10 yr,and 2.81 h/10 yr,*** increase rates of ave-rage temperature between April and May,and between June and August are 0.17 and 0.3.°C/10 yr;accumulative rainfall between April and May increased at a rate of 2.80 mm/10 yr,and accumulative rainfall between June and August decreased at a rate of 0.3. mm/10 yr;the increase rates of accumulative length of sunlight between April and May,and between June and August are 2.15 and 1.2 h/10 *** climatic suitability of grassland vegetation growth showed an increasing trend,and the increase rate between April and May is greater than that between June and *** NDVI observations from 1982 to 2006 and measurements of grass height,dry biomass,and coverage from 1994 to 2006 show that the climate change has resulted in an increase in plant productivity of the grassland in Three-River Source *** some protection measures are taken as soon as possible,the deteriorated grassland in Three-River Source Region can recover.

关键词： climate change climate suitability change grassland vegetation Three-River Source Region

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Immunization with chlamydial plasmid protein pORF5 DNA vaccine induces protective immunity against genital chlamydial infection in mice

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Science China(Life Sciences) 2008年第11期51卷 973-980页

作者： LI ZhongYu1,2, WANG ShiPing1, Wu YiMou2, ZHONG GuangMing3.& CHEN Ding3.1 Xiangya School of Medicine, Central South university, changsha 410078, China 2 Department of microbiology and Immunology, university of South China, Hengyang 421001, China 3.university of Texas Health Science center at San Antonio, TX 78229, USA Xiangya School of Medicine Central South University Changsha 410078 China Department of microbiology and Immunology University of South China Hengyang 421001 China university of Texas Health Science center at San Antonio San Antonio TX 78229 USA

To validate the immune protective efficacy of pORF5 DNA vaccine and to analyze potential mechanisms related to this protection. In this study, pORF5 DNA vaccine was constructed and evaluated for its protective immunity in a mouse model of genital chlamydial infection. Groups of BALB/c mice were immunized intranasally with pORF5 DNA vaccine. Humoral and cell mediated immune responses were evaluated. The clearance ability of chlamydial challenge from the genital tract and the chlamy- dia-induced upper genital tract gross pathology and histopathological characterization were also de- tected. The results showed that the total and the IgG2a anti-pORF5 antibody levels in serum were sig- nificantly elevated after pcDNA3.1-pORF5 vaccination, as were the total antibody and IgA levels in vaginal fluids. pcDNA3.1-pORF5 induced a significantly high level of Th1 response as measured by robust gamma interferon (IFN-γ). Minimal IL-4 was produced by immune T cells in response to the re-stimulation with pORF5 protein or the inactive elementary body in vitro. pcDNA3.1-pORF5-vacci- nated mice displayed significantly reduced bacterial shedding upon a chlamydial challenge and an accelerated resolution of infection. 100% of pcDNA3.1-pORF5 vaccinated mice successfully resolved the infection by day 24. pcDNA3.1-pORF5-immunized mice also exhibited protection against patho- logical consequences of chlamydial infection. The stimulated index was significantly higher than that of mice immunized with pcDNA3.1 and PBS (P<0.05). Together, these results demonstrated that immu- nization with pORF5 DNA vaccine is a promising approach for eliciting a protective immunity against a genital chlamydial challenge.

关键词： Chlamydia trachomatis pORF5 DNA vaccine immune protection Th1 immune response

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The line emissions and polarization in blazars

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Science China(Physics,Mechanics & Astronomy) 2010年第6期53卷 1162-1168页

作者： YANG JiangHe 1,2 ,FAN JunHui 2,3.& YANG RuShu 1 1 Department of Physics and Electronics Science,hunan university of Arts and Science,Changde 415000,China 2 center for Astrophysics,Guangzhou university,Guangzhou 510405,China 3.Key Laboratory of Astronomy Observation and Technology,Guangzhou university,Guangzhou 510405,China 1. Department of Physics and Electronics Science Hunan University of Arts and Science Changde 415000 China2. Center for Astrophysics Guangzhou University Guangzhou 510405 China3. Key Laboratory of Astronomy Observation and Technology Guangzhou University Guangzhou 510405 China

The correlations between broad-line emission,polarization,and core-dominance parameters are investigated for a sample of 148 blazars(BL Lacertae objects-BLs and flat spectrum radio quasars-FSRQs). An anti-correlation between the broad-line luminosity and the linear polarization is found. The broad-line and polarization relation can be explained by using a relativistic beaming model,which perhaps suggests that BL Lacs and FSRQs are a single class. We also investigated the relation between the ratio of the broad-line luminosity to the Eddington luminosity and linear polarization,and that between the ratio of the broad-line luminosity to the Eddington luminosity and the core-dominance parameter.

关键词： blazars(BL Lacs and FSRQs) emission line polarization jets

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Dam risk assistant analysis system design

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Science China(Technological Sciences) 2008年第S2期51卷 101-109页

作者： HE XianFeng1,2,3.GU ChongShi3.4,WU ZhongRu3.4 & SU HuaiZhi3.4 1 Yellow River Institute of Hydraulic research,Zhengzhou 450003.China 2 Embankment Security Defect Prevention and Control Engineering research center of MWR,Zhengzhou 45000,China 3.College of Water Resources and Hydropower Engineering,Hohai {3.,Nanjing 210098,China 4 National Engineering research center of Water Resources Efficient Utilization and Engineering Safety,Hohai {3.,Nanjing 210098,China Yellow River Institute of Hydraulic research Zhengzhou 450003 China Embankment Security Defect Prevention and Control Engineering research center of MWR Zhengzhou 45000 China College of Water Resources and Hydropower Engineering Hohai University Nanjing 210098 China National Engineering research center of Water Resources Efficient Utilization and Engineering Safety Hohai University Nanjing 210098 China

In order to reduce the labor intensity and task difficulty of dam risk analysis and to meet the actual requirement of dam risk analysis,it is necessary to establish a dam risk assistant analysis *** program structure and the implementation ways of the dam risk assistant analysis system are analyzed,and a procedural framework with "three-tier and multi-database" structure and "level structure" is *** concept of dam risk assessment system modular development is proposed and the coupled mode of function module and data is ***,the dam risk assistant analysis system is developed using Delphi visual programming language.

关键词： dam risk risk analysis assistant analysis system

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RRM:An incentive reputation model for promoting good behaviors in distributed systems

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Science in China(Series F) 2008年第11期51卷 1871-1882页

作者： ZHANG Hong1,2,DUAN HaiXin1,3.& LIU Wu1,3.1 Tsinghua National Laboratory for Information Science and Technology,Tsinghua university,Beijing 100084,China 2 Department of Computer Science and Technology,Tsinghua university,Beijing 100084,China 3.Network research {3.,Tsinghua university,Beijing 100084,China 1. Tsinghua National Laboratory for Information Science and Technology Tsinghua University Beijing 100084 China 2. Department of Computer Science and Technology Tsinghua University Beijing 100084 China 3. Network research center Tsinghua University Beijing 100084 China

Reputation systems represent soft security mechanisms that complement traditional information security mechanisms. They are now widely used in online e-commerce markets and communities in order to stimulate good behaviors as well as to restrain adverse behaviors. This paper analyzes the limitations of the conversational reputation models and proposes an incentive reputation model called the resilient reputation model （RRM） for the distributed reputation systems. The objective of this reputation model is not only to encourage the users to provide good services and, therefore, to maximize the probability of good transaction outcomes, but also to punish those adverse users who are trying to manipulate the application systems. The simulation results indicate that the proposed reputation model （RRM） could effectively resist against the common adverse behaviors, while protecting the profits of sincere users from being blemished by those adversaries.

关键词： reputation model distributed system trust soft security

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Fabrication and characterization of electrospun TiO2/CuS micro-nano-scaled composite fibers

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Progress in Natural Science:Materials International 2012年第1期22卷 59-63页

作者： Delong Li,Chunxu Pan School of Physics and Technology,center for Electron microscopy and MOE Key Laboratory of Artificial micro-and {3.-structures,Wuhan university,Wuhan 43.072,China School of Physics and Technology Center for Electron Microscopy and MOE Key Laboratory of Artificial Micro- and Nano-structures Wuhan University Wuhan 430072 China

A process to fabricate a kind of novel micro-nano scaled TiO2 /CuS composite fibers by electrospinning technique and chemical precipitation method was developed in the present *** microstructures and photoelectronic properties of the fibers were characterized using SEM,FT-IR,UV-vis and fluorescence *** results revealed that the TiO2 portion in the composite fibers was a mixture rutile and anatase phases while TiO2 and CuS had been fully *** fibers had smooth surface with a diameter of 50-3.0 *** with pure TiO2 fiber,the TiO2 /CuS micro-nano-scaled composite fibers exhibited a strong absorption in the visible light region and the efficiency of photo-induced charge separation were *** composite system is of widely potential applications in the areas such as solar cells,supercapacity,photocatalysis,etc.

关键词： Electrospinning TiO 2 CuS Composite fiber

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Channel-aware and queue-aware joint-layer resource optimization for cognitive radio networks

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Science China(Information Sciences) 2010年第12期53卷 2576-2583页

作者： GUO KunQi 1,2,SUN LiXin 1,LI Yong 2 & JIA ShiLou 3.1 School of Computer Science and Telecommunication Engineering,Jiangsu university,Zhenjiang 212013.China 2 research center for Wireless Communication,Shanghai Institute of {3.system and Information Technology,Chinese Academy of Sciences,Shanghai 200050,China 3.Communication research center,Harbin Institute of Technology,Harbin 150001,China 1. School of Computer Science and Telecommunication Engineering Jiangsu University Zhenjiang 212013 China2. Research Center for Wireless Communication Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050 China3. Communication Research Center Harbin Institute of Technology Harbin 150001 China

An optimization model is derived to maximize the utilization efficiency of the idle channels of primary users(PU) in cognitive radio *** the optimization model,Lyapunov optimization method is used to allocate the idle channels of PU to secondary user(SU) most *** time distribution of the idle channels of PU is predicted by a low-pass time *** algorithm is proposed to implement the optimization *** algorithm is efficient because of using a greedy selection *** efficiency of the algorithm is demonstrated by mathematic analyses and simulation results.

关键词： cognitive radio networks Lyapunov optimization resource utilization primary user secondary user

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Plasmacytoid dendritic cells in antiviral immunity and autoimmunity

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Science China(Life Sciences) 2010年第2期53卷 172-182页

作者： TANG Fei1,2,DU Qiumei1,2 & LIU Yong-Jun3.1 center for Infection and Immunity,Institute of Biophysics,Chinese Academy of Sciences,Beijing 100101,China 2 Graduate university of Chinese Academy of Sciences,Beijing 100049,China 3.Department of Immunology and center for Cancer Immunology {3.,university of Texas,M.D.Anderson Cancer center,Houston,Texas 7703.,USA 1. center for Infection and Immunity Institute of Biophysics Chinese Academy of Sciences Beijing 100101 China2. Graduate University of Chinese Academy of Sciences Beijing 100049 China3. Department of Immunology and Center for Cancer Immunology Research University of Texas M.D. Anderson Cancer Center Houston Texas 77030 USA

Plasmacytoid dendritic cells (pDCs) represent a unique and crucial immune cell population capable of producing large amounts of type I interferons (IFNs) in response to viral *** function of pDCs as the professional type I IFN-producing cells is linked to their selective expression of Toll-like receptor 7 (TLR7) and TLR9,which sense viral nucleic acids within the endosomal *** I IFNs produced by pDCs not only directly inhibit viral replication but also play an essential role in linking the innate and adaptive immune *** aberrant activation of pDCs by self nucleic acids through TLR signaling and the ongoing production of type I IFNs do occur in some autoimmune ***,pDC may serve as an attractive target for therapeutic manipulations of the immune system to treat viral infectious diseases and autoimmune diseases.

关键词： plasmacytoid dendritic cells type I interferon TLR7 TLR9 antiviral immunity autoimmune diseases

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Large-eddy simulation of formation of three-dimensional aeolian sand ripples in a turbulent field

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Science China(Physics,Mechanics & Astronomy) 2008年第8期51卷 945-960页

作者： WU ChuiJie1,WANG Ming2 & WANG Liang3.1 State Key Laboratory of Structural Analysis for Industrial Equipment,Dalian university of Technology,Dalian 116024,China 2 Yellow River Institute of Hydraulic research,Zhengzhou 450003.China 3.research {3. for Fluid Dynamics,Science School,PLA university of Science and Technology,Nanjing 211101,China State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Dalian 116024 China Yellow River Institute of Hydraulic research Zhengzhou 450003 China research center for Fluid Dynamics Science School PLA University of Science and Technology Nanjing 211101 China

With the method of large-eddy simulation,the equation of spherule motion and the method of immersed boundary condition,numerical simulations of three-dimen-sional turbulent aeolian motion and the formation of sand ripples under three-di-mensional turbulent wind and the mutual actions of saltation and creeping motion were carried out. The resulting sand ripples have the form that is flat on the upwind side and steep on the leeward,which is identical to the sand ripples in nature. We also realized the self-restoration process of three-dimensional sand ripples,which shows the correctness of the method of numerical simulation and the models of saltation and creeping. Finally,We analyzed the influence of sand ripples on the three-dimensional turbulent wind field,and found that due to the appearance and development of sand ripples,in the normal direction of ground there exists stronger energy exchange,and moreover,there is close correspondence between the forms of sand ripples and the vorticity close to the ground surface.

关键词： large-eddy simulation equation of spherule motion sand ripples saltation creep

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