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

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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 330029,china College of Water Resources and Hydropower Engineering Hohai University Nanjing China national Engineering research Center of Water Resources Efficient Utilization and Engineering Safety Hohai University Nanjing China Jiangxi Water Conservancy research Institute Nanchang 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 3D 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

3D mathematical model for suspended load transport by turbulent flows and its applications

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Science china(Technological Sciences) 2004年第2期47卷 237-256页

作者： LU Yongjun1,DOU Guoren1,HAN Longxi2,SHAO Xuejun3 & YANG Xianghua1,3 1.nanjing Hydraulic research Institute,nanjing 210029,china 2.College of Environmental Engineering of Hohai university,nanjing 210098,china 3.Department of Hydraulic Engineering,Tsinghua university,Beijing 100084,china nanjing Hydraulic research Institute Nanjing China College of Environmental Engineering of Hohai university Nanjing China Department of Hydraulic Engineering Tsinghua University Beijing China

This paper presents a 3D mathematical model for suspended load transport in turbulent flows. Based on Dous stochastic theory of turbulent flow, numerical schemes of Reynolds stresses for anisotropic turbulent flows were obtained. A refined wall function was employed to treat solid wall boundaries. The equations for 2D suspended load motion and sorting of bed material have been expanded into 3D cases. Numerical results are validated by the measured data of the Gezhouba Project, and proved to be in good agreement with the experimental. The present method has been employed to simulate sediment erosion and deposition in the dam area of Three Gorges Project, and for the operation of the project, siltation process and deposition pattern in the near-dam area of the reservoir, size distribution of the deposits and bed material, and flow fields and sediment concentration fields at different time and elevations are predicted. The predicted results are close to the experimental observations in physical model studies. Thus, a new method is established for 3D simulation of sediment motion in dam areas of multi-purpose water projects.

关键词： turbulent flows, Dou's stochastic theory, nonuniform suspended load, riverbed erosion and deposition, 3D mathematical model, Three Gorges Project.

Turbulent intensity and its similarity function over an Inner Mongolian grassland during spring

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Science china Earth Sciences 2010年第5期53卷 773-780页

作者： YUE Ping1,2,3, NIU ShengJie2, HU YinQiao4 & ZHANG Qiang1 1 Key laboratory of Arid Climate Change and Reducing Disaster of Gansu Province, Key laboratory of Arid Climate Change and Reducing Disaster of CMA, Institute of Arid Meteorology, CMA, Lanzhou 730020, china 2 nanjing university of Information Science and Technology, nanjing 210044, china 3 Zhangye national Meteorological Observatory, Zhangye 734000, china 4 Cold and Arid Regions Environmental and Engineering research Institute, Chinese Academy of Science, Lanzhou 730000, china Key laboratory of Arid Climate Change and Reducing Disaster of Gansu Province Key Laboratory of Arid Climate Change and Reducing Disaster of CMA Institute of Arid Meteorology CMA Lanzhou China nanjing university of Information Science and Technology Nanjing China Zhangye national Meteorological Observatory Zhangye China Cold and Arid Regions Environmental and Engineering research Institute Chinese Academy of Science Lanzhou China

Macroscopic reason for the development of turbulences in fluid is the conjunction action of velocity and temperature shears. We use the 2008 spring flux observations in the surface layer over Inner Mongolian grassland, obtain the similarity functions of turbulent intensity under different stratification stability conditions, and calculate the clear day turbulent intensity in the spring, which is then analyzed and compared with the observed values of turbulent intensity. The results show that in the Inner Mongolian grassland, under the condition of spring unstable stratification of the surface layer, dependence of the similarity function of turbulent intensity on stratification stability follows a "2/3 power law". The structural function is a constant under the neutral stratification condition, and complicated under the stable condition. The calculated turbulent intensity has a close correlation with the observed one, which verifies the accuracy of the similarity functions and the suitability of the theorem of turbulent intensity in the grassland region.

关键词： turbulent intensity variance of velocity similarity function grassland

VARIABLE-RATE MULTIUSER DIVERSITY IN CORRELATED MIMO CHANNEL VIA VIRTUAL CHANNEL REPRESENTATION

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Journal of Electronics(china) 2006年第3期23卷 332-337页

作者： Tang Lan You Xiaohu Liang Yingchang national mobile communications research laboratory Southeast University Nanjing 210096 China Institute for Information research Singapore 119613 Singapore

This paper studies the multiuser diversity with constellation selection based on a virtual representation of realistic Multiple Input Multiple Output （MIMO） correlated channels. To realize multiuser diversity in slow fading channels, random beamforming is adopted. Random beamforming matrix exploiting virtual channel representation is constructed, which can match the channel matrix of the desired user better. Sirnultaneously, adaptive coded modulation is applied to each sub-channel of the selected user to improve the system performance further.

关键词： Multiple Input Multiple Output (MIMO) Correlated channel Virtual channel Beamforming Multiuser diversity Adaptive modulation

Novel multi-path routing scheme for UWB Ad hoc network

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通信学报 2005年第10期26卷 89-96页

作者： XU Ping-ping YANG Cai-yu SONG Shu-qing BI Guang-guo national mobile Communication research laboratory Southeast University Nanjing 210096 China

The routing protocols play an important role for ad hoc networks *** some problems with DSR,SMR,and AMR protocols were analyzed,a new routing protocol suitable for UWB Ad hoc networks was proposed in this *** new routing protocol utilize an act of orientation of UWB and tries to get sufficient route information and decrease the network load caused by route discovery at the same *** results show that the routing load of the new protocol is lower and throughput is higher than that of *** the node’s mobility increases,these advantages become more obvious.

关键词：多路技术邮件路由 UWB通信动态系统

Hepatitis gene chip in detecting HBV DNA, HCV RNA in serum and liver tissue samples of hepatitis patients

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Hepatobiliary & Pancreatic Diseases International 2003年第2期2卷 550-557页

作者： Wei Zhao Jian-Min Wan Wei Liu Quan-Jun Liu Lin Zhang Zhen-Xian Zhou Xin-Jue Liu Han-Rong Zhang the College of Biological Science and Technology, nanjing Agriculture university, nanjing 210014, china Department of Liver Disease research, nanjing 2nd Hospital, southeast university. nanjing 210003, china national laboratory for Molecular and Biomolecular Electronics (Chien-Shiung Wu laboratory), southeast university, nanjing 210096, china College of Biological Science and Technology Nanjing Agriculture University Nanjing 210014 China. wanjm@***

OBJECTIVE: To study the preparation of diagnostic gene chip for detecting hepatitis B virus (HBV) and hepatitis C virus (HCV) and its accuracy in detecting HBV DNA and HCV RNA in serum and liver tissues. METHODS: The probes, which depend on the conservative gene fragment of hepatitis virus, was designed, synthesized and spotted on the modified glass. The probes and some other control probes were assembled on the diagnostic microarray of hepatitis virus. The gene of hepatitis virus, purified from blood or tissue, was labeled with fluorescence and hybridized to the microarray. The hybridized microarry was scanned with microarray scanner and the diagnostic result was analyzed from the scanning data. Fourty patients with hepatitis B virus and 40 healthy people or 40 patients with hepatitis C virus were subjected to detection of HBV DNA and HCV RNA with the hepatitis virus gene chip by the double-blind method. Paraffin liver specimens obtained from 99 cases of posthepatitic cirrhosis were used to detect HBV DNA. The liver tissues and serum from 15 cases of chronic hepatitis B were used to detect HBV DNA. Simultaneously, HBsAg and HBcAg were detected in the serum by fluorescence microparticle quantitation, HBV DNA and HCV RNA in the serum by PCR, and HBcAg in liver tissues by immunocytochemistry or HBV DNA by in situ molecular hybridization. RESULTS: Chip detection of serum specimens showed that 30 patients were HBV DNA positive and 10 HBV DNA negative in the 40 patients with HBV positive, 25 patients were HCV RNA positive and 15 patients were HCV RNA negative in the 40 patients with HCV positive, and all were HBV and HCV negative in the 40 healthy people. In 15 patients with HBV marker positive who were subjected to liver biopsy, 15 patients were detected HBV DNA positive in serum by gene chip, 15 patients HBcAg positive in liver tissues by immunocytochemistry, 14 patients HBV DNA positive in liver tissues by in situ molecular hybridization, and 14 patients HBV DNA posit

关键词： hepatiti gene chip serum liver tissue

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 university,nanjing 210098,china 4 national Engineering research Center of Water Resources Efficient Utilization and Engineering Safety,Hohai university,nanjing 210098,china Yellow River Institute of Hydraulic research Zhengzhou China Embankment Security Defect Prevention and Control Engineering research Center of MWR Zhengzhou China College of Water Resources and Hydropower Engineering Hohai University Nanjing China national Engineering research Center of Water Resources Efficient Utilization and Engineering Safety Hohai University Nanjing 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

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 Center 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 China Yellow River Institute of Hydraulic research Zhengzhou China research Center for Fluid Dynamics Science School PLA University of Science and Technology Nanjing 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

Evidence of DNA-Ligand Binding with Different Modes Studied by Spectroscopy

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Chinese Chemical Letters 2000年第2期11卷 147-148页

作者： Xue Mei WANGI1 Xian Lun JIANG1 Zu Hong LU1 Hong Yuan CHEN2 (1national Lab of Molecular and Biomolecular Electronics, southeast university, nanjing 210096 2Department of Chemistry, nanjing university, nanjing 210094) Natl. Lab. Molec. Biomol. E. Southeast University Nanjing 210096 China Department of Chemistry Nanjing University Nanjing 210094 China

The binding behavior of several fluorescence dyes to calf thymus DNA has been studied by absorption, fluorescence and atomic force microscopy (AFM), which could provide direct evidence of formation modes and the corre... 详细信息

关键词： atomic force microscopy (AFM) absorption spectroscopy fluorescence DNA interaction