检索结果-南通市图书馆

Sorption behavior of U(VI), ^(2.4)U(VI) and ^(2.8)U(VI) onto fracture-filling clays in Beishan granite, Gansu: Application to selecting the site of high-level radwaste repository in{2.

在线全文

学校读者我要写书评

暂无评论

Science china Earth Sciences 2005年第10期48卷 1649-1655页

作者： MIN Maozhong1,2. LUO Xingzhang3, WANG Ju4, JIN Yuanxin4 & WANG Rucheng1 1. Department of Earth Sciences, State Key Laboratory of Mineral Deposit Research, nanjing university,{2.,{2. 2. Center of Materials Analysis, nanjing university,{2.,{2. 3. Department of Environmental Science and Engineering, nanjing university,{2.,{2. 4. Beijing Geology Institute, Nuclear Industry, Beijing 10002.,{2. Department of Earth Sciences State Key Laboratory of Mineral Deposit Research Nanjing University Nanjing China Center of Materials Analysis nanjing university nanjing{{2. Department of Environmental Science and Engineering nanjing university nanjing{{2. Beijing Geology Institute Nuclear Industry Beijing china

The first results of sorption experiments of U(VI), 2.4U(VI) and 2.8U(VI) onto original (unpurified) fracture-filling clays from No.1 monzonitic granite intrusion, Beishan area, Gansu Province,{2. are reported. The monzonitic granite intrusion is a potential location for a high-level radwaste (HLW) repository in{2.. The present experimental results show that the maximum U(VI) sorption reached 92. at near-neutral pH and the distribution coefficient (Kd) was 12.6 mL/g. A high sorption capacity of the fracture-filling clays in host rock on radioactive ele-ments is necessary for HLW deep geological disposal repository. No preferential sorption of 2.4U onto the clays was found. Finally, the sorption of U(VI) onto the clays was also modeled using a surface complexation model.

关键词： HLW geological disposal repository, granite, uranium, radionuclide, clay, sorption.

Thermal-rheological structure of the lithosphere beneath Jiyang Depression:Its implications for geodynamics

在线全文

学校读者我要写书评

暂无评论

Science china Earth Sciences 2005年第10期48卷 1569-1584页

作者： LIU Shaowen1,2. WANG Liangshu2. GONG Yuling2. LI Cheng2. LI Hua2.& HAN Yongbing2.1. Department of Urban and Resources, nanjing university, nanjing 21.093,{2. 2. Department of Earth Sciences, nanjing university, nanjing 21.093,{2. Department of Urban and Resources nanjing university nanjing{{2. Department of Earth Sciences nanjing university nanjing{{2.

Jiyang Depression, located in the southeast Bohai Bay Basin, has the geomorpho-logic framework of multiple uplifts intervening with sags. Combined the abundant geo-temperature data and thermo-physical parameters of rock samples derived from oil and gas exploration during the past years, with geothermal approaches, here we investigate the litho-spheric thermal regime of this depression. Consequently, based on the obtained thermal struc-ture of the lithosphere, along with rheological modeling, the lithospheric rheological profiles of Jiyang Depression are then determined. Our results show that the temperature at the bottom of sedimentary cover within depression varies from 12.℃ to 2.8 ℃ , accompanied with the base-ment heat flow ranging between 54.3 and 60.5 mW/m2. and 406℃-436℃ for temperature at the bottom of the upper crust, along with heat flow varying from 47.7 to 52.6 mW/m2. while the tem-perature at the bottom of the middle crust is between 537 ℃ and 572.℃, as well as heat flow ranging from 41.3 to 56.3 mW/m2. The temperature at Moho ranges from 669 ℃ to 72. ℃, the heat flow derived from mantle is between 38.1 and 43.1 mW/m2. and calculated thickness of the thermal lithosphere beneath depression varies from 71 to 90 km. Lithospheric thermal regime is a close correlation with such factors as crustal thickness and surface heat flow, etc. Usually, the larger the surface heat flow, the larger the deep temperature and heat flow within lithosphere, and the thinner the thermal lithospheric thickness. This high thermal regime of the lithosphere in Jiyang Depression is thought to be related to Cenozoic back-arc spreading during the western Pacific plate subduction into Eurasian continent. Lithospheric rheological modeling shows that the lithosphere in Jiyang Depression is characterized by its distinct rheological stratification as follows: The upper and most part of the middle crust are of brittle, while the lower crust and the lower part of middle crust are all ductile

关键词： Jiyang Depression, geothermics, rheology, effective elastic thickness, geodynamics.

Integral expressions of Lyapunov exponents for autonomous ordinary differential systems

在线全文

学校读者我要写书评

暂无评论

Science china Mathematics 2009年第1期52卷 195-216页

作者： DAI XiongPing Department of Mathematics, nanjing university, nanjing 21.093,{{2. 1. Department of Mathematics Nanjing University Nanjing 210093 China

In the paper, the author addresses the Lyapunov characteristic spectrum of an ergodic autonomous ordinary differential system on a complete riemannian manifold of finite dimension such as the d-dimensional euclidean space ? d , not necessarily compact, by Liaowise spectral theorems that give integral expressions of Lyapunov exponents. In the context of smooth linear skew-product flows with Polish driving systems, the results are still valid. This paper seems to be an interesting contribution to the stability theory of ordinary differential systems with non-compact phase spaces.

关键词： Lyapunov spectrum of differential system multiplicative ergodic theorem C 1-vector field smooth linear skew-product flow lifting of probability 34D08 37C10 60B05 37H15 2.D10

The approximate state transition matrix based on non-orthogonal decomposition and its application in orbit determination

在线全文

学校读者我要写书评

暂无评论

Science china(Physics,Mechanics & Astronomy) 2010年第3期53卷 555-561页

作者： CHEN WuShen1,2. MA JingYuan2. ZHANG Jing2.& LU BenKui2.1 nanjing university of Technology, nanjing 2.0009,{2. 2.Purple Mountain Observatory, Chinese Academy of Sciences, nanjing 2.0008,{2. 1. nanjing university of Technology Nanjing 210009 China2. Purple Mountain Observatory Chinese Academy of Sciences Nanjing 210008 China

The Unit Vector Method (UVM) is an orbit determination method extensively applied. In this paper, the UVM and classical Differential Orbit Improvement (DOI) are compared, and a fusion method is given for the orbit determination with different kind data. Based on non-orthogonal decomposition of position and velocity vectors, an approximation scheme is constructed to calculate the state transition matrix. This method simplifies the calculation of the approximate state transition matrix, analyzes the convergence mechanism of the UVM, and makes clear the defect of weight strategy in UVM. Results of orbit the determination with simulating and real data show that this method has good numerical stability and rational weight distribution.

关键词： Unit Vector Method state transition matrix non-orthogonal decomposition

Crystal structure and single crystal EPR of (NH_4)_2.15-crown-5)_3[Cu(mnt)_2. and (NH_4)_2.benzo-15-crown-5)_4[Cu(mnt)_2.·0.5H_2.

在线全文

学校读者我要写书评

暂无评论

Science china Chemistry 2007年第5期50卷 607-613页

作者： SUI YunXia1, WEN LiLi2. ZHANG Huan3 & MENG QingJin2.1 Center of Modern Analysis,{2., nanjing 21.093,{2. 2.State Key Laboratory of Coordination Chemistry, Coordination Chemistry Institute,{2., nanjing 21.093,{2. 3 Jiangnan Institute of Computing Technology, Wuxi 2.4083,{2. 1. Center of Modern Analysis Nanjing University Nanjing 210093 China 2. State Key Laboratory of Coordination Chemistry Coordination Chemistry Institute Nanjing University Nanjing 210093 China 3. Jiangnan Institute of Computing Technology Wuxi 214083 China

The X-ray crystal structures of (NH4)2.15-crown-5)3[Cu(mnt)2. (1) and(NH4)2.benzo-15-crown-5)4-[Cu(mnt)2. ident to 0.5H2. (2. were *** single crystals arecomposed of distinct structures of ammonium-crown ether supramolecular cation and [Cu(mnt)2.^(2.)*** triple-decker dication in complex 1 and a sandwich dimmer in complex 2.wereobserved.X-Band EPR studies on the single crystals of both complex 1 and complex 2.have been carriedout at room temperature,which revealed that complex 2.showed a perfect hyperfine structure of Cuwhereas that of complex 1 could not be *** principal values and direction cosines of theprincipal axes of the g and A tensors were computed by a least-squares fitting *** spindensity of Cu(ll) was estimated according to the principal values of the A tensors and compared wellwith the results calculated based on DFT method.

关键词： supramolecular cation, H-bonding interaction, EPR, g and A tensors, DFT

Research on the evaluation model of the modernization level of urban construction in Jiangsu Province,china

在线全文

学校读者我要写书评

暂无评论

Science china(Technological Sciences) 2010年第9期53卷 2510-2514页

作者： YANG JunYan1 & CHEN Wen2.1 School of Architecture,Southeast university,{2. 2.0096,{2. 2.{2. Institute of Geography and Limnology,Chinese Academy of Sciences,{2. 2.0008,{2. 1. School of Architecture Southeast University Nanjing 210096 China2. Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Nanjing 210008 China

The modernization of urban construction is a key index in the process of urbanization,and also is an important index to measure the level of socio-economic and cultural *** paper analyzes and explores the related concepts of modernization of urban construction,analyzes the situation and identity of urban construction layer by layer so as to establish an evaluation index system of the modernization level of urban construction and then the paper evaluates the modernization level of urban construction from four different angles,which are the perspectives of the urban planning control,the level of urban facilities,urban management,urban construction *** later analyzes the evaluation results by choosing Jiangsu Province as a research hierarchy from the scale chains of urban study and makes efforts to the operative and directive development direction.

关键词： modernization of urban construction index system evaluation model

Incoherent control of two classes of finite-level quantum systems

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2011年第4期22卷 679-683页

作者： Chunlin Chen 1,2.and Zhenquan Qin 3,1.Department of Control and System Engineering,nanjing {2.,nanjing 21.093,P.R.china 2.State Key Laboratory for Novel Software Technology,nanjing {2.,nanjing 21.093,P.R.china 3.School of Software,Dalian {2. of Technology,Dalian 11662.,P.R.china Department of Control and System Engineering Nanjing University Nanjing 210093 P. R. China State Key Laboratory for Novel Software Technology Nanjing University Nanjing 210093 P. R. China School of Software Dalian University of Technology Dalian 116620 P. R. China

The incoherent control of finite-level quantum systems is investigated. Following a brief introduction to coherent control paradigms in quantum control, a control problem that can not be accomplished using only coherent control is presented. For such a control problem, it is proved that it can be accomplished using incoherent control based on projective measurement and coherent control for two classes of finite-level quantum systems, i.e., eigenstate controllable quantum systems and wavefunction controllable quantum systems.

关键词： quantum control eigenstate controllability wavefunction controllability coherent control incoherent control.

On the general expressions of finite Hankel transform

在线全文

学校读者我要写书评

暂无评论

Science china(Physics,Mechanics & Astronomy) 2010年第11期53卷 2125-2130页

作者： JIANG Quan 1,2.& GAO CunFa 1 1 College of Aerospace Engineering,nanjing {2. of Aeronautics and Astronautics,nanjing 2.0016,china 2.School of Civil Engineering,Nantong {2.,Nantong 2.6019,china 1. College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 China2. School of Civil Engineering Nantong University Nantong 226019 China

The general expressions of finite Hankel transform are naturally deduced with the help of the property of Bessel *** equations in this paper can degenerate into three kinds of boundaries since all the coefficients in the boundary conditions are taken into *** results can be adopted in solving physics problems involving the finite Hankel transform.

关键词： hankel transform bessel function finite integral

Pollen records of Holocene vegetation and climate changes in the Longzhong Basin of the Chinese Loess Plateau

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2007年第12期17卷 1445-1456页

作者： Tang Lingyu1 and An Chengbang2.1. nanjing Institute of Geology and Paleontology, Chinese Academy of Sciences, nanjing 2.0008,{2. 2. Key Laboratory of Western{2.’s Environment Systems, MOE, Lanzhou university, Lanzhou 730000,{2.) nanjing Institute of Geology and Paleontology Chinese Academy of Sciences Nanjing 210008 China Key Laboratory of Western china’s Environment Systems MOE Lanzhou University Lanzhou 730000 China

Pollen records with an average time resolution of 2.-2.0 years from Holocene loess sections at Dingxi, Qin'an, and other localities of Gansu Province reveal a detailed history of vegetation and climate changes in the western Loess Plateau. For most time of the Holocene, the landscape was dominated by grasslands or forest steppes. However, during the middle Holocene (7.5-5.8 ka BP), relatively dense forests developed, and the endemic vegetation flourished, suggesting a much warmer and more humid climate condition than the present. Superimposed upon this general pattern are several dry intervals marked by the episodic expansion of grasslands or forest steppe. Xeric vegetation expanded after 3.8 ka BP, indicating a trend towards dry conditions.

关键词： pollen records glasslands coniferous forests Holocene Loess Plateau.