检索结果-南通市图书馆

Chinese Journal of Population,Resources and Environment 2007年第2期5卷 34-40页

作者： Zhao Huixia1, 3, Zhang Zulu2. Jiang Luguang 1 1. Institute of geographical sciences and Natural Resources Research, Chinese Academy of sciences, Beijing 100101, China 2. college of Population, Resources and Environment, Shandong normal university, Jinan Shandong 2.0014, China 3. Graduate School of the Chinese Academy of sciences, Beijing 100039, China Institute of geographical sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China Graduate School of the Chinese Academy of sciences Beijing 100039 China college of Population Resources and Environment Shandong Normal University Jinan Shandong 250014 China

Based on the data of urban land use obtained by remote sensing interpretation from aero images in 1986 and 2.04, the spatial structure of Jinan is studied in this paper with the method of geographic Information System (GIS). According to the proportion of land for residence, industry and commerce, the urban district can be distinguished into three rings. Compared with the traditional theory of the ring structure in Western coun- tries, they have many distinctive characteristics. The main func- tions of the inner ring include residence, business and banking, but the proportion of residential land (more than 50%) is considerably higher than that of the cities in Western countries. The land proportion for residence and industry in the intermediate ring is equal on the whole. The main land of the outside ring is for industrial use. From 1986 to 2.04, great changes have taken place on the land proportion of different types of use. In the inner ring, the land for residential and industrial use has shrunk much while the land for commercial use has increased. In the intermediate ring, the changes of the three types of land use were not very much and the temporal variation was relatively stable. On the contrary, the structure in the outside ring varies acutely. Though most of it is also for industrial use, the proportion of residential land has in- creased much. The three rings can also be divided into several sectors respectively, according to the function of land use clusters. New trends and mechanisms of the changes of land use impacting the urban structure were proposed in the end of the paper.

关键词： urban land use ring structure sector structure Jinan

Entropy product measure for multipartite pure states

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2006年第5期49卷 606-615页

作者： CAO Wancang1,2. LIU Dan2. PAN Feng3 & LONG Guilu2.4 1. Department of Physics, Chifeng college, Chifeng 02.001, China 2. Key Laboratory for Quantum Information and Measurements, Department of Physics, Tsinghua university, Beijing 100084, China 3. Department of Physics, Liaoning{2. university, Dalian 11602., China 4. Key Laboratory for Atomic and Molecular Nano-sciences, Tsinghua university, Beijing 100084, China Correspondence should be addressed to Long Guilu Department of Physics Chifeng College Chifeng 024001 China Key Laboratory for Quantum Information Measurements Department of Physics Tsinghua University Beijing 100084 China Department of Physics Liaoning Normal University Dalian 116029 China Key Laboratory for Atomic Molecular Nano-sciences Tsinghua University Beijing 100084 China

An entanglement measure for multipartite pure states is formulated using the product of the von Neumann entropy of the reduced density matrices of the constituents. Based on this new measure, all possible ways of the maximal entanglement of the triqubit pure states are studied in detail and all types of the maximal entanglement have been compared with the result of ‘the average entropy’. The new measure can be used to calculate the degree of entanglement, and an improvement is given in the area near the zero entropy.

关键词： multipartite pure state von Neumann entropy entanglement measure

The toxicity of Cu^(2.) to Microcystis aeruginosa using dielectric spectroscopy

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2010年第3期53卷 631-636页

作者： YU YanLi1,BAI Wei1,ZHAO KongShuang1& ZHOU YunLong2.1college of Chemistry,Beijing normal{2.,Beijing 100875,China 2.0} of Life Science,Beijing normal{2.,Beijing 100875,China 1. college of Chemistry Beijing Normal University Beijing 100875 China2. College of Life Science Beijing Normal University Beijing 100875 China

Dielectric spectroscopy(DS) was utilized to investigate the toxicity of the Cu2. solution to Microcystis *** was found that 0.04 mM Cu2. had no effect on dielectric increment,whereas the Cu2. concentrations above 0.1 mM decreased the value of Δε/Δε *** toxic effect of Cu2. on *** cells was time-dependent and *** was a threshold concentration between 0.04 mM and 0.1 mM,which affected the cell membrane,suggesting that Cu2. at the concentrations higher than 0.1 mM caused serious plasmalemma damage to *** *** addition of 1 mM Ca2. or Mg2. did not protect *** cells from 1 mM Cu2. *** study demonstrates that DS monitors cell biomass facilitating observation of the toxic effects of metal ions.

关键词： Microcystis aeruginosa dielectric spectroscopy dielectric increment cupric ion toxicity

Development and application of ergodicity model with FRCM and FLAR for hydrological process

在线全文

学校读者我要写书评

暂无评论

Science China(Technological sciences) 2009年第2期52卷 379-386页

作者： WANG HongRui1, FENG QiLei2. LIN Xin3 & ZENG WenYi4 1 college of Water Science, Key Laboratory for Water and Sediment sciences of the Ministry of Education, Beijing{2. university, Beijing 100875, China 2.School of Science, Beijing Institute of Education, Beijing 100011, China 3 School of Mathematical sciences, Beijing{2. university, Beijing 100875, China 4 college of Information Science and Technology, Beijing{2. university, Beijing 100875, China 1. college of Water Science Key Laboratory for Water and Sediment Sciences of the Ministry of Education Beijing Normal University Beijing 100875 China 2. School of Science Beijing Institute of Education Beijing 100011 China 3. School of Mathematical sciences Beijing Normal University Beijing 100875 China 4. college of Information Science and Technology Beijing Normal University Beijing 100875 China

In this paper, a new ergodic property analysis model of hydrological process is proposed based on fuzzy-rough c-means clustering (FRCM), autocorrelogram, and fuzzy least absolute regression (FLAR). A precipitation time series (1951―2.04) from Shanghai Hydrology Station is then analyzed with the model. The results show that the precipitation time series of April, May, June, and September has er-godic property. We conclude that in the long run, the precipitation of April, May, June, and September will not keep decreasing; it will converge to its mean value in some period.

关键词： hydrological process ergodic autocorrelogram fuzzy-rough c-means clustering fuzzy least absolute regression

Study of technology on MnSO4 preparation from highferrous manganese spar

在线全文

学校读者我要写书评

暂无评论

西南师范大学学报(自然科学版) 1999年第5期 566-570页

作者： Hu Debin 1,Li Nianbing 2. Zhang Shengtao 1, Han Lianyi 1 1 college of Chemistry and Chemical Engineering,chongqing{2.,400044 2.college of Chemistry and Chemical Engineering,Southwest China normal{2.,400715

Preparation of MnSO 4 from high ferrous manganese spar is studied by *** in traditional ways,such as undesirable increasing of solution viscosity and difficulty in neutralization, are solved *** recovery ratio can be ... 详细信息

关键词： high ferrous manganese spar manganese recovery ratio filtration time

The dynamical properties of Rydberg hydrogen atom near a metal surface

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(Physics,Mechanics & Astronomy) 2005年第6期48卷 667-675页

作者： GE Meihua1, ZHANG Yanhui1, WANG Dehua2. DU Mengli3 & LIN Shenglu1 1. college of Physics and Electronics, Shandong normal{2., Jinan 2.0014, China 2. Department of Mathematics and Physics, Shandong Institute of Architecture and Engineering, Jinan 2.0014, China 3. Institute of Theoretical Physics, Chinese Academy of sciences, Beijing 100080, China 1. college of Physics and Electronics Shandong Normal University 250014 Jinan China 2. Department of Mathematics and Physics Shandong Institute of Architecture and Engineering 250014 Jinan China 3. Institute of Theoretical Physics Chinese Academy of Sciences 100080 Beijing China

The dynamical properties of Rydberg hydrogen atom near a metal surface are presented by using the methods of phase space analysis and closed orbit theory. Transforming the coordinates of the Hamiltonian, we find that the phase space of the system is divided into vibrational and rotational region. Both the Poincaré surface of section and the closed orbit theory verify the same conclusion clearly. In this paper we choose the atomic principal quantum number as n = 2.. The dynamical character of the exited hydrogen atom depends sensitively on the atom-surface distance d. When d is sufficiently large, the atom-surface potential can be expressed by the traditional van der Waals force and the system is integrable. When d becomes smaller, there exists a critical value dc. For d > dc, the system is near-integrable and the motion is regular. While chaotic motion appears for d < dc, and the system tends to be non-integrable. The trajectories become unstable and the electron might be captured onto the metal surface.

关键词： Rydberg hydrogen atom, van der Waals interaction, Poincaré surface of section, closed orbit theory, chaos.

Estimation of suspended sediment concentration based on bio-optical mechanism and HJ-1 image in Chaohu Lake

在线全文

学校读者我要写书评

暂无评论

Science China Earth sciences 2010年第S1期53卷 58-66页

作者： WANG Qiao1,2.JIN Xin2.LI YunMei2.WU ChuanQing1,Lü Heng2.WANG YanFei2.ZHANG Hong2.YIN Bin2.& ZHU Li1 1Satellite Environment Center,Ministry of Environmental Protection,Beijing 10002.,China 2.ey Laboratory of Virtual geographic Environment of Education Ministry,Nanjing normal{2.,Nanjing 2.0046,China 1. Satellite Environment Center Ministry of Environmental Protection Beijing 100029 China2. Key Laboratory of Virtual Geographic Environment of Education Ministry Nanjing Normal University Nanjing 210046 China

Synchronization experiment was conducted in June,2.09 to get Inherent Optical Properties(IOP) of water component in Chaohu *** bio-optical mechanism was studied combined with multispectral data of Environmental Satellite 1(CCD),and then inversion models of total suspended matter(TSM),inorganic suspended matter(ISM) and organic suspended matter(OSM) concentration were *** data indicated that:the absorption ratio of suspended particulate matter and CDOM to total were almost no change from band 1 to band 2.with about 85% and 9%,*** ratio of pure water to total increased from 0.4% to 5.6%.Water reflectance in these two bands were influenced by absorption of three kinds of components:algae particles absorption surpassed non-algal particles in band 3,and so played an important role in total absorption with about 35.7%;the proportion of pure water absorption and particles matter backscattering both were 99% in band 4,so these two components decided the main inherent optical properties in band *** models of TSM and ISM concentration inversion based on band combination(band 3 + band 4)/(band 1 + band 2. were built,while OSM concentration was estimated by band 4/(band 1 + band 2. *** by image data,RE of TSM concentration between modeled and measured was 33.4%,and RMSE was 18.68 mg/*** of ISM and OSM concentration were 39.9% and 35.2. *** inversion was more accurate when satellite-ground data were just in the same *** this situation,RE of ISM concentration dropped to 2..4%,and that of TSM and OSM reduced to 2..5% and 2..8% as well.

关键词： HJ-1 Satellite bio-optical property Chaohu Lake suspended matter

在线全文

学校读者我要写书评

暂无评论

基于主动网络的IP选项设计

计算机科学 2004年第8期31卷 46-48,76页

作者：李明马燕重庆教育学院信息中心重庆400067 重庆师范大学物理学与信息技术学院重庆400047

主动网络是一种新型的网络体系,它不仅可以传送资料包,而且还可以执行数据包中特定的运算任务。主动网络为用户提供了可编程的接口,用户可通过网络中的节点动态地注入所需的服务。本文分析了 IP 数据报的格式,扩展 IP 数据报选项域的定... 详细信息

主动网络是一种新型的网络体系,它不仅可以传送资料包,而且还可以执行数据包中特定的运算任务。主动网络为用户提供了可编程的接口,用户可通过网络中的节点动态地注入所需的服务。本文分析了 IP 数据报的格式,扩展 IP 数据报选项域的定义,通过在其中嵌入代码,可以在现有的 IP 网络上实现主动技术,扩展现有的网络服务。

关键词：主动网络 IP选项数据报代码主动技术

TESTING SERIAL CORRELATION IN SEMIPARAMETRIC VARYING COEFFICIENT PARTIALLY LINEAR ERRORS-IN-VARIABLES MODEL

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2009年第3期22卷 483-494页

作者： Xuemei HU Feng LIU Zhizhong WANG Mathematics and Statistics college Chongqing Technology and Business University Chongqing 400067 China. School of Mathematics and Physics Chongqing InsLitu$e of Technology Chongqing 400050 China. School of Mathematics and Computing Technology Central South University Changsha 410075 China.

The authors propose a V_(N,p) test statistic for testing finite-order serial correlation in asemiparametric varying coefficient partially linear errors-in-variables *** test statistic is shownto have asymptotic normal distribution under the null hypothesis of no serial *** MonteCarlo experiments are conducted to examine the finite sample performance of the proposed V_(N,p) *** results confirm that the proposed test performs satisfactorily in estimated sizeand power.

关键词： Asymptotic normality local linear regression measurement error modified profile leastsquares estimation partial linear model testing serial correlation varying coefficient model.