Although many methods of spatial analysis have been developed for a better understanding and modelling of urban space analysis, there is still a need for exploration of new analytical techniques for modelling urban sp...Although many methods of spatial analysis have been developed for a better understanding and modelling of urban space analysis, there is still a need for exploration of new analytical techniques for modelling urban spaces. Space Syntax models the spatial configurations of urban spaces by using a connectivity graph representation. Such a configuration of space identifies patterns that can be used to study urban structures and human behaviors. This paper tries to present a new methodology to investigate the urban spatial structure by using Space Syntax with the GIS information including land use, buildings’ characteristics and practical evaluations of the potential of the Space Syntax approach with GIS and multivariate analysis technique. Finally we try to offer some recommendations that attempt to improve the identified problems faced in Kitakyushu, Japan.展开更多
In the context of the rapid development of urbanization in China, the development of emerging town shows a high-speed prosperity. This paper describes current situation of the emerging urban green space system and ana...In the context of the rapid development of urbanization in China, the development of emerging town shows a high-speed prosperity. This paper describes current situation of the emerging urban green space system and analyzes different characteristics between current green spaces and the old city or existing urban green space. Considering green space system planning in the downtown area of Gu'an County, advantages of the "network + patch" layout for green space systems in emerging towns are summarized to explore a green space structure suited to these towns.展开更多
As the dynamic equations of space robots are highly nonlinear,strongly coupled and nonholonomic constrained,the efficiency of current dynamic modeling algorithms is difficult to meet the requirements of real-time simu...As the dynamic equations of space robots are highly nonlinear,strongly coupled and nonholonomic constrained,the efficiency of current dynamic modeling algorithms is difficult to meet the requirements of real-time simulation.This paper combines an efficient spatial operator algebra（SOA） algorithm for base fixed robots with the conservation of linear and angular momentum theory to establish dynamic equations for the free-floating space robot,and analyzes the influence to the base body＇s position and posture when the manipulator is capturing a target.The recursive Newton-Euler kinematic equations on screw form for the space robot are derived,and the techniques of the sequential filtering and smoothing methods in optimal estimation theory are used to derive an innovation factorization and inverse of the generalized mass matrix which immediately achieve high computational efficiency.The high efficient SOA algorithm is spatially recursive and has a simple math expression and a clear physical understanding,and its computational complexity grows only linearly with the number of degrees of freedom.Finally,a space robot with three degrees of freedom manipulator is simulated in Matematica 6.0.Compared with ADAMS,the simulation reveals that the SOA algorithm is much more efficient to solve the forward and inverse dynamic problems.As a result,the requirements of real-time simulation for dynamics of free-floating space robot are solved and a new analytic modeling system is established for free-floating space robot.展开更多
Currently, rural residential space can't continue to meet the growing demand for tourism receptions because of the development of rural tourism, resulting in the evolution and reconstruction of residential space i...Currently, rural residential space can't continue to meet the growing demand for tourism receptions because of the development of rural tourism, resulting in the evolution and reconstruction of residential space in rural areas. In the past decade, rural tourism has become the main driving force for industrial transformation and economic growth in rural areas of China. Taking three tourism-oriented villages in Jizhou District, Tianjin, namely Xiaochuanfangyu Village, Dongshuichang Village and Maojiayu Village, as the objects of the research, this paper analyzed the influence of rural tourism on the evolution of rural residential space from the perspectives of the spatial pattern and architectural style at the microscopic scale.展开更多
The imaging plane of inverse synthetic aperture radar （ISAR） is the projection plane of the target. When taking an image using the range-Doppler theory, the imaging plane may have a spatial-variant property, which c...The imaging plane of inverse synthetic aperture radar （ISAR） is the projection plane of the target. When taking an image using the range-Doppler theory, the imaging plane may have a spatial-variant property, which causes the change of scatter＇s projection position and results in migration through resolution cells, In this study, we focus on the spatial-variant property of the imaging plane of a three-axis-stabilized space target. The innovative contributions are as follows. 1） The target motion model in orbit is provided based on a two-body model. 2） The instantaneous imaging plane is determined by the method of vector analysis. 3） Three Euler angles are introduced to describe the spatial-variant property of the imaging plane, and the image quality is analyzed. The simulation results confirm the analysis of the spatial-variant property. The research in this study is significant for the selection of the imaging segment, and provides the evidence for the following data processing and compensation algorithm.展开更多
Red turpentine beetle （RTB）, Dendroctongs valens LeConte, is a destructive forest invasive species in China, it mainly attacks Pings tabuliformis and P. bungeana. So far it has spread rapidly to the provinces of Sha...Red turpentine beetle （RTB）, Dendroctongs valens LeConte, is a destructive forest invasive species in China, it mainly attacks Pings tabuliformis and P. bungeana. So far it has spread rapidly to the provinces of Shanxi, Hebei, Henan, Shanxi and Beijing since its first outbreak in Shanxi Province in 1998, and has caused extensive tree mortality. Space-time dynamics of D. valens population and spatial sampling technique based on its spatial distribution pattern were ana- lyzed using geostatistical methods in the pure P. tabuliforis forests and mixedwood stands which were at different damage levels. According to the spatial distribu- tion of D. valeas population, the specific spatial sampling technique was also studied, and then was compared with traditional sampling technique. The spatial sam- piing technique combined with sampling theory and the biological characteristics of D. valens population, which not only could calcnlate the error of the sampling, but also could discuss the optimal sampling number and the optimum size of plot according to different damage levels and different stand types. This helps to explain population expansion and colonization mechanism of D. valens, and to provide a good reference for adopting snitable control measures.展开更多
In this analysis, natural systems are posed to subsystemize in a manner facilitating both structured information/energy sharing and an entropy maximization process projecting a three-dimensional, spatial outcome. Nume...In this analysis, natural systems are posed to subsystemize in a manner facilitating both structured information/energy sharing and an entropy maximization process projecting a three-dimensional, spatial outcome. Numerical simulations were first carried out to determine whether n × n input-output matrices could, once entropy-maximized, project a three-dimensional Euclidean metric. Only 4 × 4 matrices could;a small proportion passed the test. Larger proportions passed when grouped random patterns on and within two- and three-dimensional forms were tested. The pattern of structural zonation within the earth was then tested in analogous fashion using spatial autocorrelation measures, and for three time periods: current, 95 million years b.p. and 200 million years b.p. All expected results were obtained;not only do the geometries of zonation project a three-dimensional structure as anticipated, but also do secondary statistical measures reveal levels of equilibrium among the zones in all three cases that are nearly total, distinguishing them from simulations that do not incorporate a varying-surface zone-width element.展开更多
Settlement of the minorities is a particular heterogeneous space in a metropolis,and such spaces exist as inseparable parts of the city for historical,social and geopolitical reasons.Taking Tibetan settlement in Wuhou...Settlement of the minorities is a particular heterogeneous space in a metropolis,and such spaces exist as inseparable parts of the city for historical,social and geopolitical reasons.Taking Tibetan settlement in Wuhou District,Chengdu City for example,this study analyzed spatial features and evolution history of minority settlements,and explored how to respect and accept historic signifi cance and cultural value of these heterogeneous spaces during the rapid urban development,and then use them reasonably and reform creatively,so as to maintain their original spatial features and integrate the spaces into the overall urban structure.展开更多
Unilateral spatial neglect (USN) is characterized by neglect in peripersonal and extrapersonal space, the disparity of which is unknown. We assessed these forms of neglect in a patient with USN. We promoted sight scan...Unilateral spatial neglect (USN) is characterized by neglect in peripersonal and extrapersonal space, the disparity of which is unknown. We assessed these forms of neglect in a patient with USN. We promoted sight scanning in extrapersonal space and used an eye camera to measure gaze movement. We found left-sided sight scanning in peripersonal space, but right-side-biased sight scanning in extrapersonal space. Additionally, line of sight was corrected when the patient was instructed to look left in extrapersonal space and to focus the line of sight at the center. Gaze measurement thus helped to assess disparities in spatial neglect in USN.展开更多
Study on eco-landscape attraction focuses on the congregate effect of production factors, but the spatial alienation of the congregate factors is an academic blind zone. This paper takes urban eco-water recreation spa...Study on eco-landscape attraction focuses on the congregate effect of production factors, but the spatial alienation of the congregate factors is an academic blind zone. This paper takes urban eco-water recreation space as the experiment object, explores the spatial alienation process of eco-landscape attraction, i.e., the homogeneous landscapes' attraction prefers alienation after factor magnetic field's differentiation, and then the attraction spaces of similar landscape areas are apt to alienation, finally leading to another new eco-landscape attraction's spatial structure of "homogeneous landscapes repel each other, heterogeneous landscapes attract" and the construction of eco-recreation alternating buffer model. In addition, this research proposes the testing procedures and evaluation method of that model, ensuring the structural innovation and application universality of the new urban recreation space planning.展开更多
Half-space Green's function due to a spatially harmonic line load has been expressed as a sum of the full-space Green's functions and a 2-D integral representation of the reflected waves by the free surface of...Half-space Green's function due to a spatially harmonic line load has been expressed as a sum of the full-space Green's functions and a 2-D integral representation of the reflected waves by the free surface of the half-space.By using the obtained half-space Green's function,an integral rep- resentation of the scattered waves by a cylindrical obstacle is then derived.Finally,by analyzing the far-zone behavior of the integrands of the integral representation.the far-field pattern of the scattered waves in a half-space obtained.展开更多
文摘Although many methods of spatial analysis have been developed for a better understanding and modelling of urban space analysis, there is still a need for exploration of new analytical techniques for modelling urban spaces. Space Syntax models the spatial configurations of urban spaces by using a connectivity graph representation. Such a configuration of space identifies patterns that can be used to study urban structures and human behaviors. This paper tries to present a new methodology to investigate the urban spatial structure by using Space Syntax with the GIS information including land use, buildings’ characteristics and practical evaluations of the potential of the Space Syntax approach with GIS and multivariate analysis technique. Finally we try to offer some recommendations that attempt to improve the identified problems faced in Kitakyushu, Japan.
文摘In the context of the rapid development of urbanization in China, the development of emerging town shows a high-speed prosperity. This paper describes current situation of the emerging urban green space system and analyzes different characteristics between current green spaces and the old city or existing urban green space. Considering green space system planning in the downtown area of Gu'an County, advantages of the "network + patch" layout for green space systems in emerging towns are summarized to explore a green space structure suited to these towns.
基金supported by National Natural Science Foundation of China (Grant No. 50375071)Commission of Science, Technology and Industry for National Defense Pre-research Foundation of China (Grant No. C4220062501)
文摘As the dynamic equations of space robots are highly nonlinear,strongly coupled and nonholonomic constrained,the efficiency of current dynamic modeling algorithms is difficult to meet the requirements of real-time simulation.This paper combines an efficient spatial operator algebra（SOA） algorithm for base fixed robots with the conservation of linear and angular momentum theory to establish dynamic equations for the free-floating space robot,and analyzes the influence to the base body＇s position and posture when the manipulator is capturing a target.The recursive Newton-Euler kinematic equations on screw form for the space robot are derived,and the techniques of the sequential filtering and smoothing methods in optimal estimation theory are used to derive an innovation factorization and inverse of the generalized mass matrix which immediately achieve high computational efficiency.The high efficient SOA algorithm is spatially recursive and has a simple math expression and a clear physical understanding,and its computational complexity grows only linearly with the number of degrees of freedom.Finally,a space robot with three degrees of freedom manipulator is simulated in Matematica 6.0.Compared with ADAMS,the simulation reveals that the SOA algorithm is much more efficient to solve the forward and inverse dynamic problems.As a result,the requirements of real-time simulation for dynamics of free-floating space robot are solved and a new analytic modeling system is established for free-floating space robot.
基金Sponsored by Humanities and Social Sciences Fund of the Ministry of Education(15YJCZH229)National Natural Science Foundation of China(51608091)
文摘Currently, rural residential space can't continue to meet the growing demand for tourism receptions because of the development of rural tourism, resulting in the evolution and reconstruction of residential space in rural areas. In the past decade, rural tourism has become the main driving force for industrial transformation and economic growth in rural areas of China. Taking three tourism-oriented villages in Jizhou District, Tianjin, namely Xiaochuanfangyu Village, Dongshuichang Village and Maojiayu Village, as the objects of the research, this paper analyzed the influence of rural tourism on the evolution of rural residential space from the perspectives of the spatial pattern and architectural style at the microscopic scale.
基金Project supported by the National Natural Science Foundation of China(Grant No.61401024)the Shanghai Aerospace Science and Technology Innovation Foundation,China(Grant No.SAST201240)the Basic Research Foundation of Beijing Institute of Technology(Grant No.20140542001)
文摘The imaging plane of inverse synthetic aperture radar （ISAR） is the projection plane of the target. When taking an image using the range-Doppler theory, the imaging plane may have a spatial-variant property, which causes the change of scatter＇s projection position and results in migration through resolution cells, In this study, we focus on the spatial-variant property of the imaging plane of a three-axis-stabilized space target. The innovative contributions are as follows. 1） The target motion model in orbit is provided based on a two-body model. 2） The instantaneous imaging plane is determined by the method of vector analysis. 3） Three Euler angles are introduced to describe the spatial-variant property of the imaging plane, and the image quality is analyzed. The simulation results confirm the analysis of the spatial-variant property. The research in this study is significant for the selection of the imaging segment, and provides the evidence for the following data processing and compensation algorithm.
基金Supported by Research Project of Jiangsu Entry-Exit Inspection and Quarantine Bureau(2015KJ49)Project of Beijing Municipal Education Commission(JD100220888)+2 种基金Project of Beijing Excellent Talents Funding(D Class)Project of Beijing Municipal Education Commission(JD100220888)Beijing Excellent Talents Funding(D Class)Project "Study on Prevention and Control Technology of Dendroctonus valens"
文摘Red turpentine beetle （RTB）, Dendroctongs valens LeConte, is a destructive forest invasive species in China, it mainly attacks Pings tabuliformis and P. bungeana. So far it has spread rapidly to the provinces of Shanxi, Hebei, Henan, Shanxi and Beijing since its first outbreak in Shanxi Province in 1998, and has caused extensive tree mortality. Space-time dynamics of D. valens population and spatial sampling technique based on its spatial distribution pattern were ana- lyzed using geostatistical methods in the pure P. tabuliforis forests and mixedwood stands which were at different damage levels. According to the spatial distribu- tion of D. valeas population, the specific spatial sampling technique was also studied, and then was compared with traditional sampling technique. The spatial sam- piing technique combined with sampling theory and the biological characteristics of D. valens population, which not only could calcnlate the error of the sampling, but also could discuss the optimal sampling number and the optimum size of plot according to different damage levels and different stand types. This helps to explain population expansion and colonization mechanism of D. valens, and to provide a good reference for adopting snitable control measures.
文摘In this analysis, natural systems are posed to subsystemize in a manner facilitating both structured information/energy sharing and an entropy maximization process projecting a three-dimensional, spatial outcome. Numerical simulations were first carried out to determine whether n × n input-output matrices could, once entropy-maximized, project a three-dimensional Euclidean metric. Only 4 × 4 matrices could;a small proportion passed the test. Larger proportions passed when grouped random patterns on and within two- and three-dimensional forms were tested. The pattern of structural zonation within the earth was then tested in analogous fashion using spatial autocorrelation measures, and for three time periods: current, 95 million years b.p. and 200 million years b.p. All expected results were obtained;not only do the geometries of zonation project a three-dimensional structure as anticipated, but also do secondary statistical measures reveal levels of equilibrium among the zones in all three cases that are nearly total, distinguishing them from simulations that do not incorporate a varying-surface zone-width element.
基金Sponsored by Youth Program of National Natural Science Fund(51108379)
文摘Settlement of the minorities is a particular heterogeneous space in a metropolis,and such spaces exist as inseparable parts of the city for historical,social and geopolitical reasons.Taking Tibetan settlement in Wuhou District,Chengdu City for example,this study analyzed spatial features and evolution history of minority settlements,and explored how to respect and accept historic signifi cance and cultural value of these heterogeneous spaces during the rapid urban development,and then use them reasonably and reform creatively,so as to maintain their original spatial features and integrate the spaces into the overall urban structure.
文摘Unilateral spatial neglect (USN) is characterized by neglect in peripersonal and extrapersonal space, the disparity of which is unknown. We assessed these forms of neglect in a patient with USN. We promoted sight scanning in extrapersonal space and used an eye camera to measure gaze movement. We found left-sided sight scanning in peripersonal space, but right-side-biased sight scanning in extrapersonal space. Additionally, line of sight was corrected when the patient was instructed to look left in extrapersonal space and to focus the line of sight at the center. Gaze measurement thus helped to assess disparities in spatial neglect in USN.
基金Sponsored by 2014 Key Program of Jiangsu Provincial Applied Social Science Researches(14SWC-018)Key Program of Youth Foundation of Nanjing Institute of Tourism&Hospitality(2013NLY001)
文摘Study on eco-landscape attraction focuses on the congregate effect of production factors, but the spatial alienation of the congregate factors is an academic blind zone. This paper takes urban eco-water recreation space as the experiment object, explores the spatial alienation process of eco-landscape attraction, i.e., the homogeneous landscapes' attraction prefers alienation after factor magnetic field's differentiation, and then the attraction spaces of similar landscape areas are apt to alienation, finally leading to another new eco-landscape attraction's spatial structure of "homogeneous landscapes repel each other, heterogeneous landscapes attract" and the construction of eco-recreation alternating buffer model. In addition, this research proposes the testing procedures and evaluation method of that model, ensuring the structural innovation and application universality of the new urban recreation space planning.
文摘Half-space Green's function due to a spatially harmonic line load has been expressed as a sum of the full-space Green's functions and a 2-D integral representation of the reflected waves by the free surface of the half-space.By using the obtained half-space Green's function,an integral rep- resentation of the scattered waves by a cylindrical obstacle is then derived.Finally,by analyzing the far-zone behavior of the integrands of the integral representation.the far-field pattern of the scattered waves in a half-space obtained.
