High concentration of population and other elements brought by high urbanization has pushed the future construction of urban public spaces to be both "compact" and "ecological". Theory and methodol...High concentration of population and other elements brought by high urbanization has pushed the future construction of urban public spaces to be both "compact" and "ecological". Theory and methodology of landscape urbanism provides a new perspective for the construction of public spaces in high-density urban environment. Based on the concept and basic standpoints of landscape urbanism, this paper elaborated its potential value in spatial connection, functional integration and vitality promotion, and also analyzed practical strategies of landscape urbanism from three perspectives of structure, fold and stage by combining with typical cases, so as to provide references for designing urban public spaces in high-density environment.展开更多
Korean academic libraries are facing a serious space shortage problem due to the inability to uphold the rapidly increasing amount of printed materials despite having expanded the number of physical facilities. Data c...Korean academic libraries are facing a serious space shortage problem due to the inability to uphold the rapidly increasing amount of printed materials despite having expanded the number of physical facilities. Data computerization has been considered as a solution to the issue, but deliberation for the High Density Book Storage System has been on the rise because of its impressive method of preserving printed materials in a realistic facility. Despite the different methods of print material storage, Korean academic libraries have largely focused on investing in the least efficient method of compact shelving to solve this issue. It is hypothesized that the misuse of funds on inefficient systems is occurring due to the lack of knowledge about the high-density book storage systems like the Harvard model. In order to propose a realistic solution to the academic library space shortage crisis on a logical basis, it is imperative that a study of academic librarians is conducted to investigate their knowledge on such efficient storage systems.展开更多
The vacuum energy density of free scalar quantum field in a Rindler distributional space-time with distributional Levi-Cività connection is considered. It has been widely believed that, except in very extreme sit...The vacuum energy density of free scalar quantum field in a Rindler distributional space-time with distributional Levi-Cività connection is considered. It has been widely believed that, except in very extreme situations, the influence of acceleration on quantum fields should amount to just small, sub-dominant contributions. Here we argue that this belief is wrong by showing that in a Rindler distributional background space-time with distributional Levi-Cività connection the vacuum energy of free quantum fields is forced, by the very same background distributional space-time such a Rindler distributional background space-time, to become dominant over any classical energy density component. This semiclassical gravity effect finds its roots in the singular behavior of quantum fields on a Rindler distributional space-times with distributional Levi-Cività connection. In particular we obtain that the vacuum fluctuations have a singular behavior at a Rindler horizon . Therefore sufficiently strongly accelerated observer burns up near the Rindler horizon. Thus Polchinski’s account doesn’t violate the Einstein equivalence principle.展开更多
Based on the daily reanalysis data of NCEP / NCAR and by using the method of phase space reconstruction, the point conditional probability density of the subtropical high ridge index are determined and then used, toge...Based on the daily reanalysis data of NCEP / NCAR and by using the method of phase space reconstruction, the point conditional probability density of the subtropical high ridge index are determined and then used, together with their power spectra, to seek the correlation between them and individual monsoon-affecting factors and their power spectra. Through diagnosis, six indexes are discovered that have the most important effects on the subtropical high index. The results of the diagnosis indicate that the technique can identify the factors which are dynamically correlated. It can offer the basis in determining and choosing dynamic conceptual factors.展开更多
【目的】挖掘非正式绿地(informal green space,IGS)的生态系统服务(ecosystem service,ES)价值,对缓解城市绿地供应不足、提升城市绿色空间品质具有重要意义。【方法】以位于上海市的6个典型非正式绿地为例,采用统计分析、重要性-绩效...【目的】挖掘非正式绿地(informal green space,IGS)的生态系统服务(ecosystem service,ES)价值,对缓解城市绿地供应不足、提升城市绿色空间品质具有重要意义。【方法】以位于上海市的6个典型非正式绿地为例,采用统计分析、重要性-绩效分析(importance-performance analysis,IPA)等多种分析方法,从整体评价和受访者群组分析2个层面揭示受访者感知的ES指标的丰度、多样性、一致性等指数的差异,以及其差异与不同IGS之间的联系。【结果】发现受访者对4个ES类别中12个指标的感知评价存在显著差异,其中受访者在所有样地中感知的支持服务发挥了高重要性-高绩效水平,支持服务可被认为是IGS提供的最重要、最高性能和最高优先级的ES类型。供给服务和文化服务被认为是非正式绿地中重要性最高但绩效较差的服务类型。【结论】提出了考虑样地关键要素差异化、介入用地管理和结合文化服务的优化及管理策略,结果对提供居民感知的ES视角下IGS空间的优化及管理策略具有积极意义。展开更多
文摘High concentration of population and other elements brought by high urbanization has pushed the future construction of urban public spaces to be both "compact" and "ecological". Theory and methodology of landscape urbanism provides a new perspective for the construction of public spaces in high-density urban environment. Based on the concept and basic standpoints of landscape urbanism, this paper elaborated its potential value in spatial connection, functional integration and vitality promotion, and also analyzed practical strategies of landscape urbanism from three perspectives of structure, fold and stage by combining with typical cases, so as to provide references for designing urban public spaces in high-density environment.
文摘Korean academic libraries are facing a serious space shortage problem due to the inability to uphold the rapidly increasing amount of printed materials despite having expanded the number of physical facilities. Data computerization has been considered as a solution to the issue, but deliberation for the High Density Book Storage System has been on the rise because of its impressive method of preserving printed materials in a realistic facility. Despite the different methods of print material storage, Korean academic libraries have largely focused on investing in the least efficient method of compact shelving to solve this issue. It is hypothesized that the misuse of funds on inefficient systems is occurring due to the lack of knowledge about the high-density book storage systems like the Harvard model. In order to propose a realistic solution to the academic library space shortage crisis on a logical basis, it is imperative that a study of academic librarians is conducted to investigate their knowledge on such efficient storage systems.
文摘The vacuum energy density of free scalar quantum field in a Rindler distributional space-time with distributional Levi-Cività connection is considered. It has been widely believed that, except in very extreme situations, the influence of acceleration on quantum fields should amount to just small, sub-dominant contributions. Here we argue that this belief is wrong by showing that in a Rindler distributional background space-time with distributional Levi-Cività connection the vacuum energy of free quantum fields is forced, by the very same background distributional space-time such a Rindler distributional background space-time, to become dominant over any classical energy density component. This semiclassical gravity effect finds its roots in the singular behavior of quantum fields on a Rindler distributional space-times with distributional Levi-Cività connection. In particular we obtain that the vacuum fluctuations have a singular behavior at a Rindler horizon . Therefore sufficiently strongly accelerated observer burns up near the Rindler horizon. Thus Polchinski’s account doesn’t violate the Einstein equivalence principle.
基金Research Foundation for Tropical and Marine Meteorology (200609)Natural Science Foundation of China (40375019)Key and Open Laboratory on Tropical Monsoon, China Meteorological Administration
文摘Based on the daily reanalysis data of NCEP / NCAR and by using the method of phase space reconstruction, the point conditional probability density of the subtropical high ridge index are determined and then used, together with their power spectra, to seek the correlation between them and individual monsoon-affecting factors and their power spectra. Through diagnosis, six indexes are discovered that have the most important effects on the subtropical high index. The results of the diagnosis indicate that the technique can identify the factors which are dynamically correlated. It can offer the basis in determining and choosing dynamic conceptual factors.
文摘【目的】挖掘非正式绿地(informal green space,IGS)的生态系统服务(ecosystem service,ES)价值,对缓解城市绿地供应不足、提升城市绿色空间品质具有重要意义。【方法】以位于上海市的6个典型非正式绿地为例,采用统计分析、重要性-绩效分析(importance-performance analysis,IPA)等多种分析方法,从整体评价和受访者群组分析2个层面揭示受访者感知的ES指标的丰度、多样性、一致性等指数的差异,以及其差异与不同IGS之间的联系。【结果】发现受访者对4个ES类别中12个指标的感知评价存在显著差异,其中受访者在所有样地中感知的支持服务发挥了高重要性-高绩效水平,支持服务可被认为是IGS提供的最重要、最高性能和最高优先级的ES类型。供给服务和文化服务被认为是非正式绿地中重要性最高但绩效较差的服务类型。【结论】提出了考虑样地关键要素差异化、介入用地管理和结合文化服务的优化及管理策略,结果对提供居民感知的ES视角下IGS空间的优化及管理策略具有积极意义。
