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研究目的:深入分析城市用地密度的空间分布及其演化特征,揭示城市空间结构特征与发展规律。研究方法:圈层分析法,形态模型(ULD)和过程模型(GMP)。研究结果:(1)城市用地密度从城市中心向外逐渐非线性衰减,呈现反S形分布,城市中心吸引和土地资源稀缺性是其形成的主要原因;(2)快速城市化时期城市郊区增长速度快于核心区,导致城市紧凑度下降,突显了合理管控城市边界的重要性;(3)城市紧凑度在城市化过程中表现出先下降后回升趋势,反映了从分散扩张到集中利用的空间模式转变;(4)对于多中心等复杂形态城市,引入新参数可以进一步提升过程模型的拟合优度。研究结论:本文揭示了城市用地密度空间衰减的形态特征和过程机理,形态和过程模型为定量理解城市用地密度空间格局提供了有效工具。 相似文献
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Although tourist development appears to be an effective approach for the further development of historic towns, researchers have often contended that a balance is difficult to maintain between protection and development. This article applies space syntax analysis to provide an understanding of tourist space at historic sites on Gulangyu Island. The relationship between street network integration and the urban fabric as well as tourist preferences collated from data mining are explored and verified. Then, results of the space syntax analysis along with the proposed historic site plan are compared to provide suggestions in plan evaluation. This research provides a visualized and quantitative approach to the field of tourist management via the application of Geographic Information System (GIS) to urban morphological features, tourist preferences and results gathered by way of planning practice. The effectiveness and limitations of this proposed new approach are also debated and substantiated. 相似文献
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成功地采用水解法制备了球形锐钛矿TiO2,研究了空白实验(未引入晶种)、引入10 nm TiO2晶种及菌体晶种对锐钛矿TiO2形貌的影响。结果表明随着引入晶种的颗粒逐渐变大,合成的锐钛矿型TiO2颗粒也在逐渐增大:空白实验中TiO2的颗粒平均直径约为0.5μm,10 nm TiO2晶种中TiO2的颗粒平均直径约为0.6~0.7μm,菌体中TiO2的颗粒平均直径约为0.8~0.9μm;加入晶种的颗粒越大,合成的锐钛矿型TiO2颗粒粒度越均匀,球形越完整、团聚现象越少。 相似文献
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Our overview has the objective of making our study relevant to bioeconomists. The need for the ‘alternatives’ to the Synthetic
Theory of Evolution in social-economic studies was substantiated, for example, by Colombatto (Journal of Bioeconomics, 5, 1–25, 2003), who maintains that the natural-selection theory is ‘ill suited’ to describing evolutionary processes in
economics. He proposed an alternative ‘non-Darwinian’ approach by equating the ‘non-Darwinian’ approach with a definite version
of neo-Lamarckism. Yet, as we will show, there is a palette of alternative approaches within and beyond the neo-Lamarckism.
We hope to give bioeconomists more choice in their theoretical modeling and constructing of analogies between biology and
economics. It will also be shown that in the light of suggested definitions the concept of ‘universal Darwinism’ recently
discussed in bioeconomics makes little sense as a generalizing category. In addition, in the concluding part of the paper
we demonstrate that the majority of alternative approaches are far from being pigeonholed as archaic and once and for all
wiped off the theoretical landscape. On the contrary, in recent years one can observe some revival of interest in the theoretical
‘heresies’.
相似文献
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中国本土化城市形态论 总被引:6,自引:1,他引:6
针对中国城市正在表现为城市文化与城市文脉的断裂,城市记忆出现空白,城市形态从物理的、空间的、文化的、心理的层面出现断裂这些现象,全面反思了中国城市形态的各种主要问题,提出了城市形态本土化主张,强调了中国本土化城市形态的人与自然和谐为本的理念,并将之上升为一个民族经济与社会文化发展可持续力的构建和民族自信力的重构问题. 相似文献
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市镇规划分析:概念、方法与实践 总被引:3,自引:1,他引:3
通过对相关文献的回顾,系统描述和总结了"市镇规划分析"的理论、方法和历史根源以及在实践中的应用."市镇规划分析"作为行之有效的城市形态分析工具,可以帮助深化和扩展处于发展中的中国传统城市研究和历史保护规划管理. 相似文献