流动与想象：西藏地方意义的多元互构研究     

张兴泰  陈志钢  张骁鸣  金红燕 《地理研究》2021,40(8):2292-2313

研究聚焦于“地理想象”这一典型的文化地理现象,借助鲍曼的“流动的现代性”概念工具,分析了两种多元空间在同一时空进程中的混杂状态,尝试从流动性的视角重新阐释西藏地方意义的多元互构方式。以西藏为例,研究初步验证了如下两个理论猜想：① 未到西藏之前,人们的惯常思维是以经历过或正在经历的现实空间来对未经历的西藏空间加以想象,因为这种现实“在场”与想象“不在场”的时刻混杂,从而引发了一些改变人地关系的流动,如“我要去西藏亲眼看看”和“我想去真实地感受那里”等;② 真实到达西藏以后,“身体触摸”下的陌生西藏空间却不同于原本接近于诗意化表达下的那个想象空间,多元空间在同一时空进程下的混杂使得旅游者这一典型的现代人群体产生某种错觉,仿佛又置身于另一个新的现代性进程,于是在一个新的“第三空间”中通过与地方联结开始反思现代性之于个体的生命价值与存在意义。研究结论揭示了西藏地方意义的构成背后所隐藏的现代人对于流体化现代性生活的反身性思考,同时从学理上赋予地理想象概念以新的流动性解释。  相似文献   

Assessing green gentrification in historically disenfranchised neighborhoods: a longitudinal and spatial analysis of Barcelona   总被引：1，自引：1，他引：0  

Isabelle Anguelovski  James J. T. Connolly  Laia Masip  Hamil Pearsall 《Urban geography》2018,39(3):458-491

To date, little is known about the extent to which the creation of municipal green spaces over an entire city addresses social or racial inequalities in the distribution of environmental amenities – or whether such an agenda creates contributes to green gentrification. In this study, we evaluate the effects of creating 18 green spaces in socially vulnerable neighborhoods of Barcelona during the 1990s and early 2000s. We examined the evolution over time of six socio-demographic gentrification indicators in the areas close to green spaces in comparison with the entire districts. Our results indicate that new parks in the old town and formerly industrialized neighborhoods seem to have experienced green gentrification. In contrast, most economically depressed areas and working-class neighborhoods with less desirable housing stock and more isolated from the city center gained vulnerable residents as they became greener, indicating a possible redistribution and greater concentration of vulnerable residents through the city.  相似文献   

特大城市群生态空间及其生态承载状态的时空分异   总被引：2，自引：0，他引：2  

王世豪  黄麟  徐新良  李佳慧 《地理学报》2022,77(1):164-181

快速城镇化导致中国城市群地区生态空间被大量挤占,生态承载压力加剧,已成为制约城市群健康发展的重要因素。本文界定并分析了京津冀、长三角、粤港澳大湾区、成渝、长江中游5个特大城市群三生空间结构分布特征,解析了1990—2020年生态空间时空分异及其变化的影响因素,进一步通过水资源供给、水质调节、空气质量调节、休闲游憩探讨了近30年生态空间综合承载状态及其时空分异特征。研究结果表明：① 不同形成发育阶段的城市群呈现差异性的三生空间面积结构比、以多中心组合为主的生活空间拓展演变模式,以及屏障式、紧密、离散、全包围式的生态空间结构。② 1990—2020年城市群生活空间面积持续大幅度增加而生产空间呈现相反趋势,除粤港澳大湾区以外,生态空间均表现出增加态势尤其近10年增势明显。三生空间面积结构及其时空变化特征,说明特大城市群生产、生态空间的主要功能从供给转向调节和文化,并反映了中国从快速城镇化到新型可持续城镇化的转变。③ 5个城市群分别有78.6%、73.1%、54.5%、56.3%和25.8%市域呈现严重超载的综合生态承载状态,其中水资源供给、水质调节是制约城市群生态承载水平的要因,未来需要重视城市群生态空间保留量及其合理布局以减缓生态承载压力。本文可为城市群绿色可持续发展、三生空间结构优化和配置提供科学依据。  相似文献   

Relations between integrable systems in plane and curved spaces   总被引：1，自引：0，他引：1  

Alexey V. Borisov  Ivan S. Mamaev 《Celestial Mechanics and Dynamical Astronomy》2007,99(4):253-260

We consider trajectory isomorphisms between various integrable systems on an n-dimensional sphere S ⁿ and a Euclidean space . Some of the systems are classical integrable problems of Celestial Mechanics in plane and curved spaces. All the systems under consideration have an additional first integral quadratic in momentum and can be integrated analytically by using the separation of variables. We show that some integrable problems in constant curvature spaces are not essentially new from the viewpoint of the theory of integration, and they can be analyzed using known results of classical Celestial Mechanics.  相似文献   

基于频谱空间的高分辨率遥感图像城市道路绿地轮廓特征检测     

赵好好 《南京气象学院学报》2020,12(5):625-633

通过高分辨率遥感图像频谱能量特征分析,提出了一种基于频谱空间的城市道路绿地轮廓特征检测方法.首先对遥感图像进行傅里叶变换,分析频谱能量分布曲线,确定道路绿地轮廓的方向和截止频率,设计Gabor滤波器提取绿地轮廓特征;然后利用低通滤波获取道路中心线,根据道路中心线的缓冲区对绿地轮廓进行定位,得到道路绿地轮廓特征.结果表明,基于图像频谱特征分析的方法,使滤波器参数的设计更加精确,可有效实现高分辨率遥感图像城市道路绿地轮廓特征提取.  相似文献   

Enacting separate social worlds: ‘International’ and ‘local’ students in public space in central Melbourne     

Ruth Fincher 《Geoforum》2011,42(5):539-549

In creating separate and distinct spaces and forms of socialising for themselves, ‘international’ and ‘local’ university students in central Melbourne are influenced by three key, spatially-linked processes. The first is institutional - it includes the allocation of international students to a certain type of housing which differs from that chosen by local students, and the practice of universities, student clubs and local churches to gather international and local students into separate groupings. The second is locational. It is the process by which international students find themselves living principally in and around the edge of the central city, an entertainment district with rowdy characteristics that these students often find distasteful. Local students, in contrast, locate in the inner suburbs for the most part, at a distance from the city centre hotspot. The third process sees socialising habits that are enacted in and by virtue of the public places in which they occur. This self-enacting socialisation further separates local students from international students. All three processes demonstrate how certain characteristics of the built environment can be invested with particular meanings and become complicit in shaping racialised social interactions.  相似文献   

φ积分型压缩条件下弱相容映象的几个公共不动点定理     

郑泽申  张勇  冯宇 《成都信息工程学院学报》2014,(2):186-194

为了强化理论知识的应用,在这篇论文中,利用度量空间中自映象的弱相容性条件,讨论φ积分型压缩条件的公共不动点存在性和唯一性问题,证明了几个新的公共不动点定理,文章改进和发展了Pathk,Verma和张勇等的结果。  相似文献   

Transformation of relational space in targeted poverty alleviation from the perspective of actor network: A case study of Hebian Village,Mengla County,Yunnan Province北大核心CSCD     

范振杰  何丹  李小云 《地理科学进展》2023,(4):754-765

精准扶贫中政府主导、企业和社会积极响应,共同助力贫困户脱贫,引致乡村关系空间在脱贫前后发生转化。论文使用参与式观察、半结构访谈和问卷调查等方法,从行动者网络视角重新审视云南省勐腊县河边村的精准扶贫,将关系空间转化划分为阶段内关系空间转化和阶段间关系空间转化,拓展了行动者网络理论对关系空间转化的解释,发现了河边村关系空间的阶段特征与转化路径:(1)精准扶贫中河边村的关系空间存在阶段性特征,包括脱贫攻坚阶段的前关系空间(标准空间较大)和巩固脱贫成果阶段的后关系空间(协商空间较大)。(2)阶段内关系空间转化是标准空间向协商空间转化的过程。以脱贫攻坚阶段为例,“两不愁、三保障”这一明确政策目标下的标准行为构建了较大的标准空间,有利于确立强制通行点,促进阶段内关系空间转化。(3)阶段间关系空间转化是前一阶段的协商空间转化为后一阶段的标准空间的过程,脱贫攻坚阶段的前协商空间就转化成了巩固脱贫成果阶段的后标准空间。这一关系空间转化的过程可结合新标准行为的应用和空间稳定性测度进行验证。(4)关系空间转化促成了村小组和村民转变为后关系空间中的关键行动者,他们在参与改善建成环境的过程中被动员起来,通过成立合作社的形式和其他行动者结成紧密网络联盟,未来会在巩固拓展脱贫攻坚成果、全面推进乡村振兴的过程中发挥关键作用。论文所构建的关系空间转化框架对分析和促进乡村地区的发展兼具理论价值与现实意义。  相似文献   

A review of: “Principles of Geodynamics, 3rd edition. By Adrian E. Scheiddeger. Springer-Verlag,Berlin-Heidelberg-New York,xvii + 395pp. DM165, U.S. $73.30 (ISBN 3-540-11323-1). 1982.”     

A. D. Gilbert 《地球物理与天体物理流体动力学》2013,107(3-4):309-311

Abstract

Edited by J.-P. Zhan and J. Zinn-Justin, Elsevier, 1993. XXIV+ 615 pp., US$248.50, hardbound (ISBN-0-444-81797-2).  相似文献   

Effects of shrubs and precipitation on spatial-temporal variability of soil temperature in microhabitats induced by desert shrubs     

YaFeng Zhang  XinPing Wang  Rui Hu  YanXia Pan 《寒旱区科学》2013,5(2):0197-0204

Soil temperatures at 0, 5, 10 and 20 cm depths were monitored continuously at different microhabitats (beneath shrub canopy (BSC); bare intershrub spaces (BIS)) induced by xerophytic shrub (Caragana korshinskii Kom.) canopy, respectively. We mainly aimed to assess the effects of shrub canopy and precipitation on the spatial-temporal variability of soil temperature. Results indicate that both precipitation and vegetation canopy significantly affect soil temperature. In clear days, soil temperatures within the BSC area were significantly lower than in the BIS at the same soil depth due to shading effects of shrub canopy. Diurnal variations of soil temperature show a unimodal sinusoidal curve. The amplitude of soil temperature tended to decrease and a hysteresis of diurnal maximum soil temperature existed at deeper soil layers. Vertical fluctuations of soil temperature displayed four typical curves. In the nighttime (approximately from sunset to sunrise), surface temperature within the BSC area was higher than in the BIS. In rainy days, however, soil temperatures were affected mainly by precipitation and the shrub canopy had a negligible effect on soil temperature, and little difference in soil temperature at the same soil depth was found between the BSC area and in the BIS. Diurnal variations in soil temperature decreased exclusively as rainfall continued and the vertical fluctuations of soil temperature show an increased tendency with increasing soil depth.  相似文献