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An Empirical Study on Chinese City Network Pattern Based on Producer Services 被引量:17
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作者 ZHEN Feng WANG Xia +1 位作者 YIN Jun ZHANG Min 《Chinese Geographical Science》 SCIE CSCD 2013年第3期274-285,共12页
Globalization and informatization have accelerated city networking process over the world, which makes research on city network a hot topic in the fields of urban geography and economic geography. With Chinese economi... Globalization and informatization have accelerated city networking process over the world, which makes research on city network a hot topic in the fields of urban geography and economic geography. With Chinese economic structure adjustment and city economic growth, producer services have begun to play an increasingly important role in city-region networking. This paper employs the methodology of world city network to analyze and explain the spatial development characteristics of China's urban network system based on the data of nationwide producer services enterprise network. The research result indicated that the distribution of producer services network has a positive effect on the development of Chinese city networks. City network connectivity is closely related to the significance of city in producer services development, and the former will gradually decline with the drop of the latter. Accordingly, the 64 cities can be divided into the national central cities, regional central cities, sub-regional central cities and local central cities in accordance with their position and role in the nationwide producer services network. It is concluded that high-grade cities with quality producer services dominate the pattern of Chinese city networks and there emerges three spatial agglomerations of producer services enterprises in Changjiang (Yangtze) River Delta, Zhujiang (Pearl) River Delta and Beijing-Tianjin-Tangshan Economical Region. Moreover, the distribution of different producer services industry varies from city to city, which also affects the characteristics of network development. 展开更多
关键词 world city network producer services urban hierarchy network connectivity chinese city network
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Analysis of the Chinese air route network as a complex network 被引量:29
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作者 Cai Kai-Quan Zhang Jun +1 位作者 Du Wen-Bo Cao Xian-Bin 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第2期596-602,共7页
The air route network, which supports all the flight activities of the civil aviation, is the most fundamental infrastructure of air traffic management system. In this paper, we study the Chinese air route network (C... The air route network, which supports all the flight activities of the civil aviation, is the most fundamental infrastructure of air traffic management system. In this paper, we study the Chinese air route network (CARN) within the framework of complex networks. We find that CARN is a geographical network possessing exponential degree distribution, low clustering coefficient, large shortest path length and exponential spatial distance distribution that is obviously different from that of the Chinese airport network (CAN). Besides, via investigating the flight data from 2002 to 2010, we demonstrate that the topology structure of CARN is homogeneous, howbeit the distribution of flight flow on CARN is rather heterogeneous. In addition, the traffic on CARN keeps growing in an exponential form and the increasing speed of west China is remarkably larger than that of east China. Our work will be helpful to better understand Chinese air traffic systems. 展开更多
关键词 complex network chinese air route network air transportation
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A preliminary investigation on the topology of Chinese climate networks 被引量:2
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作者 王革丽 Anastasios A Tsonis 《Chinese Physics B》 SCIE EI CAS CSCD 2009年第11期5091-5096,共6页
Complex networks have been studied across many fields of science in recent years. In this paper, we give a brief introduction of networks, then follow the original works by Tsonis et al (2004, 2006) starting with da... Complex networks have been studied across many fields of science in recent years. In this paper, we give a brief introduction of networks, then follow the original works by Tsonis et al (2004, 2006) starting with data of the surface temperature from 160 Chinese weather observations to investigate the topology of Chinese climate networks. Results show that the Chinese climate network exhibits a characteristic of regular, almost fully connected networks, which means that most nodes in this case have the same number of links, and so-called super nodes with a very large number of links do not exist there. In other words, though former results show that nodes in the extratropical region provide a property of scale-free networks, they still have other different local fine structures inside. We also detect the community of the Chinese climate network by using a Bayesian technique; the effective number of communities of the Chinese climate network is about four in this network. More importantly, this technique approaches results in divisions which have connections with physics and dynamics; the division into communities may highlight the aspects of the dynamics of climate variability. 展开更多
关键词 chinese climate network complex systems small world COMMUNITY
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Network Curriculum Design of Traditional Chinese Medicine Pharmacy Specialty Formed by Introducing Guangxi Minority Medicine 被引量:1
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作者 Anda WEI Hua ZHU +3 位作者 Liqun SHEN Lin KANG Fengfeng XIE Danni LI 《Medicinal Plant》 CAS 2022年第2期73-76,86,共5页
Starting from the background and significance of the development and design of the network course of traditional Chinese medicine pharmacy specialty formed by introducing Guangxi minority medicine,this paper discusses... Starting from the background and significance of the development and design of the network course of traditional Chinese medicine pharmacy specialty formed by introducing Guangxi minority medicine,this paper discusses the teaching design scheme and module construction of the network course in the development process,and summarizes the design,production and construction experience of the network course.Through practice,the teaching effect and achievement of the network course of traditional Chinese medicine pharmacy specialty formed by introducing Guangxi minority medicine are obvious. 展开更多
关键词 network course of traditional chinese medicine pharmacy Guangxi minority medicine Design
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Chinese Ecosystem Research Network 被引量:1
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作者 Huang Tieqing, Liu Jian, Chen Panqin & Fu Bojie(CAS Bureau of Science and Technology for Resources and Environment) 《Bulletin of the Chinese Academy of Sciences》 2002年第3期174-177,共4页
The article analyzes the development of the Chinese Ecosystem Research Network, and its mission, mandate, and management mechanisms, with examples of research, demonstration and consultation for policy-setting.
关键词 CERN chinese Ecosystem Research network World
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Worldwide Marine Transportation Network: Efficiency and Container Throughput 被引量:9
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作者 邓为炳 郭龙 +1 位作者 李炜 蔡勖 《Chinese Physics Letters》 SCIE CAS CSCD 2009年第11期242-245,共4页
Through empirical analysis of the global structure of the Worldwide Marine Transportation Network (WMTN), we find that the WMTN, a small-world network, exhibits an exponential-like degree distribution. We hereby inv... Through empirical analysis of the global structure of the Worldwide Marine Transportation Network (WMTN), we find that the WMTN, a small-world network, exhibits an exponential-like degree distribution. We hereby investigate the efficiency of the WMTN by employing a simple definition. Compared with many other transportation networks, the WMTN possesses relatively low efficiency. Furthermore, by exploring the relationship between the topological structure and the container throughput, we find that strong correlations exist among the container throughout the degree and the clustering coefficient. Also, considering the navigational process that a ship travels in a real shipping line, we obtain that the weight of a seaport is proportional to the total probability contributed by all the passing shipping lines. 展开更多
关键词 chinese climate network complex systems small world community
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Chaotic Control of Network Traffic
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作者 杨谈 崔毅东 +1 位作者 金跃辉 程时端 《Chinese Physics Letters》 SCIE CAS CSCD 2009年第12期49-51,共3页
A method of chaotic control on network traffic is presented. By this method, the chaotic network traffic can be controlled to a pre-assigned equilibrium point according to chaotic prediction and the largest Lyapunov e... A method of chaotic control on network traffic is presented. By this method, the chaotic network traffic can be controlled to a pre-assigned equilibrium point according to chaotic prediction and the largest Lyapunov exponent ofthe traffic on congested link is reduced, thereby the probability of traffic burst and network congestion can be reduced. Numerical examples show that this method is effective. 展开更多
关键词 chinese climate network complex systems small world COMMUNITY
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Lie Symmetries, Perturbation to Symmetries and Adiabatic Invariants of a Generalized Birkhoff System 被引量:18
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作者 李彦敏 《Chinese Physics Letters》 SCIE CAS CSCD 2010年第1期5-8,共4页
We study the perturbation to symmetries and adiabatic invariants of a generalized Birkhoff system. Based on the invariance of differential equations under infinitesimal transformations, Lie symmetries, laws of conserv... We study the perturbation to symmetries and adiabatic invariants of a generalized Birkhoff system. Based on the invariance of differential equations under infinitesimal transformations, Lie symmetries, laws of conservations, perturbation to the symmetries and adiabatic invariants of the generalized Birkhoff system are presented. First, the concepts of Lie symmetries and higher order adiabatic invariants of the generalized Birkhoff system are proposed. Then, the conditions for the existence of the exact invariants and adiabatic invariants are proved, and their forms are given. Finally, an example is presented to illustrate the method and results. 展开更多
关键词 chinese climate network complex systems small world community
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A Thermodynamic Cavitation Model for Cavitating Flow Simulation in a Wide Range of Water Temperatures 被引量:9
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作者 张瑶 罗先武 +3 位作者 季斌 刘树红 吴玉林 许洪元、 《Chinese Physics Letters》 SCIE CAS CSCD 2010年第1期198-201,共4页
A thermodynamic cavitation model is developed to simulate the cavitating water flow in a wide temperature range. The thermal effect on bubble growth during cavitation is introduced in the developed model by considerin... A thermodynamic cavitation model is developed to simulate the cavitating water flow in a wide temperature range. The thermal effect on bubble growth during cavitation is introduced in the developed model by considering both pressure difference and heat transfer between the vapor and liquid phase. The cavitating turbulent flow over a NACA0015 hydrofoil has been simulated at various temperatures from room temperature to 150°C by using the present cavitation model, which has been validated by the experimental data. It is seen that the thermodynamic effects of cavitation, vapor depression and temperature depression are much more predominant in high temperature water compared with those in room temperature water. These results indicate that the proposed thermodynamic cavitation model is reasonably applicable to the cavitating water flow in a wide temperature range. 展开更多
关键词 chinese climate network complex systems small world COMMUNITY
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Diffusion-Based Recommendation in Collaborative Tagging Systems 被引量:8
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作者 尚明生 张子柯 《Chinese Physics Letters》 SCIE CAS CSCD 2009年第11期250-253,共4页
Recently, collaborative tagging systems have attracted more and more attention and have been wlaely appnea in web systems. Tags provide highly abstracted information about personal preferences and item content, and th... Recently, collaborative tagging systems have attracted more and more attention and have been wlaely appnea in web systems. Tags provide highly abstracted information about personal preferences and item content, and therefore have the potential to help in improving better personalized recommendations, We propose a diffusion- based recommendation algorithm considering the personal vocabulary and evaluate it in a real-world dataset: Del.icio.us. Experimental results demonstrate that the usage of tag information can significantly improve the accuracy of personalized recommendations. 展开更多
关键词 chinese climate network complex systems small world COMMUNITY
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Hierarchy, clusters, and spatial differences in Chinese inter-city networks constructed by scientific collaborators 被引量:13
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作者 马海涛 方创琳 +2 位作者 林赛南 黄晓东 徐成东 《Journal of Geographical Sciences》 SCIE CSCD 2018年第12期1793-1809,共17页
The Chinese urban system is currently experiencing a fundamental shift, as it moves from a size-based hierarchy to a network-based system. Contemporary studies of city networks have tended to focus on economic interac... The Chinese urban system is currently experiencing a fundamental shift, as it moves from a size-based hierarchy to a network-based system. Contemporary studies of city networks have tended to focus on economic interactions without paying sufficient attention to the issue of knowledge flow. Using data on co-authored papers obtained from China Academic Journal Network Publishing Database (CAJNPD) during 2014-2016, this study explores several features of the scientific collaboration network between Chinese mainland cities. The study concludes that: (1) the spatial organization of scientific cooperation amongst Chinese cities is shifting from a jurisdiction-based hierarchical system to a networked system; and (2) several highly intra-connected city regions were found to exist in the network of knowledge, and such regions had more average internal linkages (14.21) than external linkages (8.69), and higher average internal linkage degrees (14.43) than external linkage degrees (10.43); and (3) differences existed in terms of inter-region connectivity between the Western, Eastern, and Central China regional networks (the average INCD of the three regional networks were 109.65, 95.81, and 71.88). We suggest that China should engage in the development of regional and subregional scientific centers to achieve the goal of building an innovative country. Whilst findings reveal a high degree of concentration in those networks - a characteristic which reflects the hierarchical nature of China's urban economic structure - the actual spatial distribution of city networks of knowledge flow was found to be different from that of city networks based on economic outputs or population. 展开更多
关键词 chinese city networks knowledge flows scientific collaboration co-authored papers knowledge city clusters China academic journal innovative country regional differences
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Schemes for Teleportation of an Unknown Single-Qubit Quantum State by Using an Arbitrary High-Dimensional Entangled State 被引量:6
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作者 詹佑邦 张群永 +1 位作者 王郁武 马鹏程 《Chinese Physics Letters》 SCIE CAS CSCD 2010年第1期33-36,共4页
We propose a scheme to teleport an unknown single-qubit state by using a high-dimensional entangled state as the quantum channel. As a special case, a scheme for teleportation of an unknown single-qubit state via thre... We propose a scheme to teleport an unknown single-qubit state by using a high-dimensional entangled state as the quantum channel. As a special case, a scheme for teleportation of an unknown single-qubit state via three-dimensional entangled state is investigated in detail. Also, this scheme can be directly generalized to an unknown f-dimensional state by using a d-dimensional entangled state (d〉f) as the quantum channel. 展开更多
关键词 chinese climate network complex systems small world community
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Vibration Characteristics of Acoustically Levitated Object with Rigid and Elastic Reflectors 被引量:6
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作者 洪振宇 解文军 魏炳波 《Chinese Physics Letters》 SCIE CAS CSCD 2010年第1期170-173,共4页
Levitation stability is a crucial factor that influences acoustic levitation capability. We present two sample-including models for a single-axis acoustic levitator with either a rigid or elastic reflector. Numerical ... Levitation stability is a crucial factor that influences acoustic levitation capability. We present two sample-including models for a single-axis acoustic levitator with either a rigid or elastic reflector. Numerical analysis shows that, with the rigid reflector, both the decay time from initial disturbance and the vibration amplitude increase with sample density, which is unfavorable for levitation stability. However, with the elastic reflector, the decay time and the vibration amplitude are greatly reduced by choosing appropriate parameters of the reflector. Experimental results agree well with theoretical predictions, indicating that levitation stability can be remarkably enhanced by replacing the rigid reflector with an elastic reflector. 展开更多
关键词 chinese climate network complex systems small world COMMUNITY
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Optical Switch Formation in Antimony Super-Resolution Mask Layers Induced by Picosecond Laser Pulses 被引量:6
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作者 翟凤潇 左方圆 +4 位作者 黄欢 王阳 赖天树 吴谊群 干福熹 《Chinese Physics Letters》 SCIE CAS CSCD 2010年第1期151-154,共4页
Sb is a classic material of a super-resolution near field structure (super-RENS) mask layer in which the optical switch formation is often realized by nanosecond laser pulse stimulation. We achieve fast and repeatab... Sb is a classic material of a super-resolution near field structure (super-RENS) mask layer in which the optical switch formation is often realized by nanosecond laser pulse stimulation. We achieve fast and repeatable optical switching driven by picosecond laser pulses in a proper fluence range on Sb thin films. The optical properties of Sb thin films before and after switching are studied by surface-sensitive micro-area ellipsometry. The change of optical constants after switching is less than 2% in the whole visible range. The Sb mask layer is shown to be very promising for ultrafast super-resolution optical storage applications. 展开更多
关键词 chinese climate network complex systems small world community
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Fractal Analysis of Surface Roughness of Particles in Porous Media 被引量:5
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作者 蔡建超 郁伯铭 +1 位作者 邹明清 梅茂飞 《Chinese Physics Letters》 SCIE CAS CSCD 2010年第2期157-160,共4页
A fractal dimension for roughness height (RH) is introduced to characterize the degree of roughness or disorder of particle surface characters which significantly influence physical-chimerical processes in porous me... A fractal dimension for roughness height (RH) is introduced to characterize the degree of roughness or disorder of particle surface characters which significantly influence physical-chimerical processes in porous media. An analytical expression for the fractal dimension of RH on statistically self-similar fractal surfaces is derived and is expressed as a function of roughness parameters. The specific surface area (SSA) of porous materials with spherical particles is also derived, and the proposed fractal model for the SSA of particles with rough surfaces is expressed as a function of fractal dimension for RH and fractal dimension for particle size distribution, relative roughness of particle surface, and ratio of the minimum to the maximum particle diameters of spherical particles. 展开更多
关键词 chinese climate network complex systems small world COMMUNITY
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Evaluation of Thermal Degradation Induced Material Damage Using Nonlinear Lamb Waves 被引量:5
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作者 项延训 轩福贞 邓明晰 《Chinese Physics Letters》 SCIE CAS CSCD 2010年第1期190-193,共4页
We report on the evaluation of thermal degradation damage in metal material using the nonlinear effect of Lamb wave propagation. A mountain-shape'' change in the second harmonic of Lamb wave propagation versus the l... We report on the evaluation of thermal degradation damage in metal material using the nonlinear effect of Lamb wave propagation. A mountain-shape'' change in the second harmonic of Lamb wave propagation versus the level of thermal degradation in the specimens is observed. It is attributed to the precipitations in the early stage and the microvoids after long-term service in terms of metallographic studies. The results show that the nonlinear Lamb wave is very sensitive to the microstructure evolution and is a good potential for quantitative evaluation of the thermal damaged materials. 展开更多
关键词 chinese climate network complex systems small world COMMUNITY
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Jet-Photon Production at RHIC and LHC 被引量:4
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作者 傅永平 李云德 《Chinese Physics Letters》 SCIE CAS CSCD 2009年第11期23-26,共4页
We calculate the production of prompt and thermal photons which includes the contribution of gluons in relativistic heavy ion collisions with the equilibrium and non-equilibrium quark-gluon plasma. We develop a new th... We calculate the production of prompt and thermal photons which includes the contribution of gluons in relativistic heavy ion collisions with the equilibrium and non-equilibrium quark-gluon plasma. We develop a new thermal jet-photon conversion mechanism which plays a vital role in the low transverse momentum region. The effect of the non-equilibrium quark-gluon plasma enhances the contribution of the thermal photons. The shadowing and iso-spin of the nucleus which can properly estimate the prompt photon production are also considered in our calculation. 展开更多
关键词 chinese climate network complex systems small world community
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Density Functional Theory Approach for Charged Hard Sphere Fluids Confined in Spherical Micro-Cavity 被引量:4
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作者 康艳霜 王海军 《Chinese Physics Letters》 SCIE CAS CSCD 2009年第12期186-189,共4页
Within the framework of the density functional theory for classical fluids, the equilibrium density profiles of charged hard sphere fluid confined in micro-cavity are studied by means of the modified fundamental measu... Within the framework of the density functional theory for classical fluids, the equilibrium density profiles of charged hard sphere fluid confined in micro-cavity are studied by means of the modified fundamental measure theory. The dimension of micro-cavity, the charge of hard sphere and the applied electric field are found to have significant effects on the density profiles. In particular, it is shown that Coulomb interaction, excluded volume interaction and applied electric field play the central role in controlling the aggregated structure of the system. 展开更多
关键词 chinese climate network complex systems small world community
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Planar Metamaterial Microwave Absorber for all Wave Polarizations 被引量:4
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作者 朱博 王正斌 +4 位作者 余振中 张奇 赵俊明 冯一军 姜田 《Chinese Physics Letters》 SCIE CAS CSCD 2009年第11期66-69,共4页
We present a design for a polarization insensitive metamaterial absorber at 9.5 GHz by utilizing properly arranged resonant unit cells with orthogonal polarization sensitivity. Full-wave electromagnetic simulation dem... We present a design for a polarization insensitive metamaterial absorber at 9.5 GHz by utilizing properly arranged resonant unit cells with orthogonal polarization sensitivity. Full-wave electromagnetic simulation demonstrates nearly perfect microwave absorption, which has been verified by experimental measurement with a maximum absorption of about 92% for incident wave with different polarizations. Furthermore, we find such a metamaterial thin absorber could work for a wide incident angle ranging from 0° to 50°with absorption no less than 80° for both the transverse electric mode and transverse magnetic mode. 展开更多
关键词 chinese climate network complex systems small world COMMUNITY
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Exploring Traditional Chinese Medicine by A Novel Therapeutic Concept of Network Target 被引量:42
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作者 李梢 《Chinese Journal of Integrative Medicine》 SCIE CAS CSCD 2016年第9期647-652,共6页
Traditional Chinese medicine(TCM) holds a holistic theory, and specializes in balancing disordered human body using numerous natural products, particularly Chinese herbal formulae. TCM has certain treatment advantag... Traditional Chinese medicine(TCM) holds a holistic theory, and specializes in balancing disordered human body using numerous natural products, particularly Chinese herbal formulae. TCM has certain treatment advantages for patients suffering from various complex diseases. However, due to the complex nature of TCM, it remains difficult to unveil such holistic medicine by the current reductionism research strategies, which treat both herbal ingredients and targets in isolation. Recently, an emerging network pharmacology approach has been introduced to tackle this bottleneck problem. A TCM-derived novel therapeutic concept, "network target", which is different from the Western medicine's "onetarget" concept, has been proposed from China. The network target strategy is able to illustrate the complex interactions among the biological systems, drugs, and complex diseases from a network perspective, and thus provides an innovative approach to access ancient remedies in a precision manner and at a systematic level, which also highlights TCM's potential in current medical systems. 展开更多
关键词 traditional chinese medicine network target network pharmacology herbal formula complex disease
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