检索结果-南通市图书馆

A three-dimensional variational ocean data assimilation system:Scheme and preliminary results

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China Earth Sciences 2006年第11期49卷 1212-1222页

作者： ZHU Jiang1,2. ZHOU Guangqing1, YAN Changxiang1, FU Weiwei1 & YOU Xiaobao1,3 1. International center for Climate and Environment Sciences, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 10002., China 2. Jiangsu Key Laboratory of Meteorological Disaster, nanjing {2.of Information Science and Technology, nanjing 2.004., China 3. Beijing Institute of Applied Meteorology, Beijing 10002., China 1. International center for Climate and Environment Sciences Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China 2. Jiangsu Key Laboratory of Meteorological Disaster Nanjing University of Information Science and Technology Nanjing 210044 China 3. Beijing Institute of Applied Meteorology Beijing 100029 China

A new 3DVAR-based Ocean Variational analysis System (OVALS) is developed. OVALS is capable of assimilating in situ sea water temperature and salinity observations and satellite altimetry data. As a component of OVALS, a new variational scheme is proposed to assimilate the sea surface height data. This scheme considers both the vertical correlation of background errors and the nonlinear temperature-salinity relationship which is derived from the generalization of the linear balance constraints to the nonlinear in the 3DVAR. By this scheme, the model temperature and salinity fields are directly adjusted from the altimetry data. Additionally, OVALS can assimilate the temperature and salinity profiles from the ARGO floats which have been implemented in recent years and some temperature and salinity data such as from expendable bathythermograph, moored ocean buoys, etc. A 2.-year assimilation experiment is carried out by using OVALS and the Tropical Pacific circulation model. The results show that the assimilation system may effectively improve the estimations of temperature and salinity by assimilating all kinds of observations. Moreover, the root mean square errors of temperature and salinity in the upper depth less than 4.0 m reach 0.63℃ and 0.34.psu.

关键词： data assimilation, 3DVAR, sea surface height, ARGO floats.

A NEW TYPE OF DOMAIN STRUCTURE: AN INTERGROWTH OF ORDERED AND DISORDERED STRUCTURE DOMAINS IN LAZURITE

在线全文

学校读者我要写书评

暂无评论

南京大学学报(自然科学) 1999年第6期 3-5页

作者： Ge Xiaoyue 1) Luo Gufeng 1)** Zhao Ming 1) Zhang Fusheng 2. Zhang Shuyuan 3 Zhou Jianping 1) Yao Yujie 4. ( 1)Department of Earth Sciences, nanjing {2. 2.0093. nanjing 2.{4. for Materials analysis, Nanj

Ｌａｚｕｒｉｔｅ,ｈａｕｙｎｅａｎｄｎｏｓｅａｎａｒｅｔｈｅｓｕｌｆａｔｅｒｉｃｈｍｅｍｂｅｒｓｏｆｓｏｄａｌｉｔｅｇｒｏｕｐｍｉｎｅｒａｌｓｗｉｔｈｉｓｏｔｙｐｉｃｓｔｒｕｃｔｕｒｅａｎｄｓｉｍｉｌａｒｃｈｅｍｉｃ... 详细信息

Ｌａｚｕｒｉｔｅ,ｈａｕｙｎｅａｎｄｎｏｓｅａｎａｒｅｔｈｅｓｕｌｆａｔｅｒｉｃｈｍｅｍｂｅｒｓｏｆｓｏｄａｌｉｔｅｇｒｏｕｐｍｉｎｅｒａｌｓｗｉｔｈｉｓｏｔｙｐｉｃｓｔｒｕｃｔｕｒｅａｎｄｓｉｍｉｌａｒｃｈｅｍｉｃａｌｃｏｍｐｏｓｉｔｉｏｎ.Ｔｈｅｙ...

关键词： domain structure order disorder lazurite

Synthesis,structure and properties of an imidazolate bridged copper,zinc binuclear complex

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 1992年第1期10卷 45-51页

作者： MAO,Zong-Wan CHEN,Dong TANG,Wen-Xia Coordination Chemistry Institute,nanjing university.nanjing 2.0008 YU,Kai-Bei LIU,Li analysis {4.,Chengdu Branch of The Chinese Academy of Sciences,Chengdu 610015 1Coordination Chemistry Institute Nanjing University Nanjing 2100082Analysis Center Chengdu Branch of The Chinese Academy of Sciences Chengdu 610015

A new imidazolate bridged Cu^(2.),Zn^(2.)binuclear complex[(dtma) CulmZn (dtma)]ClO_4. 2.5H_2. taken as active site model for Cu,Zn-SOD has been synthesized and its crystal structure *** the bond lengths, bond angles and the distance between Cu and Zn atoms in Cu-Im- Zn core of the model complex are close to those in Cu,*** parameters of the model complex as a function of pH show that the imidazolate bridge is stable in pH range 10—12.and is broken on Zn side at pH～*** decreasing pH,the imidazole is released at pH～4.and the dtma ligand dissociates from the Cu containing fragment at pH～2.4.

关键词： Cu Synthesis,structure and properties of an imidazolate bridged copper,zinc binuclear complex Zn

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

在线全文

学校读者我要写书评

暂无评论

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 2.0098,China 2.National Engineering Research {2. of Water Resources Efficient Utilization and Engineering Safety,Hohai university.nanjing 2.0098,China 3 Jiangxi Water Conservancy Research Institute,Nanchang 33002.,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 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

Hybrid method of limit equilibrium and finite element internal force for analysis of arch dam stability against sliding

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2011年第4期54卷 793-798页

作者： BAO TengFei1,2.3,XU BaoSong1,2.3 & ZHENG XueQing1,2.3 1State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Hohai university.nanjing 2.0098,China 2.ational Engineering Research {2. of Water Resources Efficient Utilization and Engineering Safety,nanjing 2.0098,China 3College of Water Conservancy and Hydropower Engineering,Hohai university.nanjing 2.0098,China 1. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai University Nanjing 210098 China2. National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety Nanjing 210098 China3. College of Water Conservancy and Hydropower Engineering Hohai University Nanjing 210098 China

A hybrid method of limit equilibrium and finite element internal force for analysis of arch dam stability against sliding is *** finite element internal force method(FEIFM) is used to provide more accurate thrust forces acting on the faces of a slip body,and the limit equilibrium method(LEM) is employed to evaluate the factor of safety of the slip *** method presented can deal with a slip body with large amount of geometrically complex slip *** addition,compared with the traditional LEM,it can meet the balance condition of the forces in the slip *** example shows that the factor of safety obtained by the method presented agrees well with the theoretical solution.A practical example is also presented to demonstrate the application of the method in the stability analysis of an arch dam *** results from the examples show that the method is promising in analysis of arch dam stability against sliding.

关键词： arch dam stability against sliding limit equilibrium method finite element internal force method

Galactic kinematics and structure defined by open clusters

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2009年第12期9卷 1285-1302页

作者： Zi Zhu Department of Astronomy Nanjing University Nanjing 210093 China

On the basis of recently published astrophysical parameters of the open clusters, we have selected 301 clusters with measurements of their kinematical parameters to trace the local structure and kinematics of the Galactic disk. The present sample covers a range of over 3.0 kpc from the Sun and gives significant estimates of the disk structure and kinematical parameters of the Galaxy. We derive the disk scale height, vertical displacement of the Sun to the Galactic plane, solar motion with respect to the local standard of rest, circular speed of the Galactic rotation, Galactocentric distance from the Sun, etc. We found that the average scale height of the disk defined by the open clusters is Zh = 58 ± 4.c, with a vertical displacement of the Sun below the Galactic plane of z0 -= - 16±4.pc. Clusters with ages older than 50 Myr are less concentrated in the average plane （Zh=67 ±6pc） than the younger clusters （Zh = 51±5pc）. Using the approximation of axisymmetric circular rotation, we have derived the distance to the Galactic {2. from the Sun R0 = 8.03 ±0.70 kpc, which is in excellent agreement with the best estimate of the Galactocentric distance. From a kinematical analysis, we found an agedependent rotation of the Galaxy. The older clusters exhibit a lower velocity of vorticity, but have the same shear as the younger clusters. The mean rotation velocity of the Galaxy was obtained as 2.5 ± 10 km s-1.

关键词： Galaxy: disk -- Galaxy: kinematics and dynamics -- Galaxy: open clustersand associations: general -- Galaxy: structure

Review on hidden trouble detection and health diagnosis of hydraulic concrete structures

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2007年第z1期50卷 34-50页

作者： WU ZhongRu1,2., LI Ji1, GU ChongShi1,2.& SU HuaiZhi1,2.1 College of Water Conservancy and Hydropower Engineering, Hohai university. nanjing 2.0098, China 2.National Engineering Research {2. of Water Resources Efficient Utilization and Engineering Safety, nanjing 2.0098, China College of Water Conservancy and Hydropower Engineering Hohai University Nanjing 210098 China National Engineering Research center of Water Resources Efficient Utilization and Engineering Safety Nanjing 210098 China

A large number of hydraulic concrete structures have hidden defects such as cracks, erosion, freeze and thaw, thermal fatigue, carbonization. These hidden defects seriously affect the strength, stability and durability of structures. These problems are studied mainly by single monitoring or diagnosis methods at present. The integration of multiple monitoring and diagnosis methods is not applied widely. Besides, the analysis theory on these problems is not developed very well. The systemic study on the aging mechanism of hydraulic concrete structures, time- variation model and health diagnosis is still not enough. The support for engineering practice is limited. Aimed at these major scientific and technological problems and combined with specific projects, study on detection of hidden defects and health diagnosis of hydraulic concrete structure has been carried out. This study includes the following content: field non-destructive examination of hidden defects of hydraulic concrete structures, seepage detection, the construction of in-situ sensing system, the combination of field detection and in-situ monitoring, the mechanism of crack, freeze and thaw, erosion and carbonization of hydraulic concrete structure, mechanism of combination aging; time-variation model of hydraulic concrete structure, theories and methods for health diagnosis of hydraulic concrete structures.

关键词： hydraulic concrete structure hidden trouble detection health diagnosis

A new method of estimating the equivalent elastic modulus of RCCD

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2007年第z1期50卷 136-143页

作者： GU ChongShi1,2., WU Yuan1, SU HuaiZhi1,2.& TANG LiHui1 1 College of Water Conservancy and Hydropower Engineering, Hohai university. nanjing 2.0098, China 2.National Engineering Research {2. of Water Resources Efficient Utilization and Engineering Safety, nanjing 2.0098, China College of Water Conservancy and Hydropower Engineering Hohai University Nanjing 210098 China National Engineering Research center of Water Resources Efficient Utilization and Engineering Safety Nanjing 210098 China

Based on the composite material mechanic theory, the analysis method for the equivalent elastic moduli which are parallel and vertical to the construction interface of RCCD is studied in this paper. The differences between the equivalent elastic moduli which are vertical to the construction interface of RCCD gotten from different methods are discussed in detail. The variation range of the equivalent elastic modulus which is vertical to the construction interface of RCCD is studied based on the principle of minimum complementary energy and the principle of minimum potential energy. The effect of the related influential factors on the equivalent elastic modulus is analyzed. The estimation formula of the equivalent modulus which is vertical to the construction interface of RCCD is proposed. The feasibility of the approach proposed in this paper is analyzed through an example.

关键词： RCCD equivalent elastic modulus variation range estimation method

Numerical simulations of self-propelled swimming of 3D bionic fish school

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2009年第3期52卷 658-669页

作者： WU ChuiJie1 & WANG Liang2.1 State Key Laboratory of Structural analysis for Industrial Equipment, Dalian university.of Technology, Dalian 11602.2. China 2.Research center for Fluid Dynamics, People’s Liberation Army university.of Science and Technology, {{2. 2.1101, China State Key Laboratory of Structural analysis for Industrial Equipment Dalian University of Technology Dalian 116024 China Research center for Fluid Dynamics People’s Liberation Army University of Science and Technology Nanjing 211101 China

Numerical simulations of self-propelled swimming of a three dimensional bionic fish and fish school in a viscous fluid are carried out. This is done with the assistance of a parallel software package produced for 3D moving boundary problems. This computational fluid dynamics package combines the adaptive multi-grid finite volume method, the immersed boundary method and VOF (volume of fluid) method. By using the package results of the self-propelled swimming of a 3D bionic fish and fish school in a vis- cous fluid are obtained. With comparison to the existing experimental measurements of living fishes, the predicted structure of vortical wakes is in good agreement with the measurements.

关键词： adaptive multi-grid immersed boundary method self-propelled swimming fish school 3D bionic fish