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1.
Eugene J McCann 《Geoforum》2002,33(3):385-398
A major concern of work in urban and political geography in recent decades has been to analyze how and in whose interests local space economies are produced and reproduced. A common focus is on the role local elites play in gathering support for their development agendas. Drawing from these literatures, this paper focuses on how various visions of the future of localities are contested in the local policy process. It argues that this struggle can be usefully understood as a cultural politics in which meanings are defined and struggled over, where social values are naturalized, and by which `common sense' is constructed and contested. The use of the term `cultural politics of local economic development' is, then, intended to indicate that meaning-making and place-making occur simultaneously in struggles over the future of space economies. It is also an attempt to overcome the problematic distinction between `culture' and `economy' that continues to haunt a great deal of work on urban politics. Through a case study of urban politics in Lexington, Kentucky in which discursive strategies are highlighted, it is argued that this approach is useful in that it provides insight into non-elite perspectives on local economic development and that it underscores the role played by everyday life in constituting political action. The paper concludes by suggesting that any problematization of the conceptual distinction between `culture' and `economy' must be carried out in and through detailed analyses of how groups involved in social struggle frequently construct rhetorical strategies in reference to it.  相似文献   

2.
Judith Petts  Susan Owens 《Geoforum》2008,39(2):593-601
Drawing upon the discussions and insights provided by researchers and policy-makers during a seminar series, this paper explores the rationales for, and the practices and difficulties of, interdisciplinarity. The urban environment provides the problem context. Despite a consistent rhetoric and repeated attempts to promote interdisciplinary research, not least by the funding councils in response to policy imperatives, success appears to have been limited. The paper suggests that rather than viewing interdisciplinarity as a distinct, often difficult, category of research it is more useful to consider a continuum of research types from multi- to transdisciplinarity. The paper furthers the interdisciplinarity debate by characterising five categories of ‘border troubles’. These involve the relentless association of interdisciplinarity with ‘real world problems’, the epistemological structuring of disciplines, assumptions about the disciplinary division of labour and the privileging of certain frames and forms of enquiry, the increasing complexity of knowledge transfer, and the ‘hard wiring’ of the research funding and assessment system. However, we conclude optimistically in terms of the evident willingness of researchers to occupy hazardous disciplinary border zones to further urban environmental understanding and propose a set of ‘conditions for success’ encompassing both the approach and practices of participants in interdisciplinary work as well as operational and contextual factors.  相似文献   

3.
镁铁质微粒包体在南岭中段中、晚侏罗世花岗岩中分布十分普遍,其分布规律是,岩体内同阶段较早次形成的岩石单元含量高,较晚次单元中含量少甚至无;与钨、锡、钼、铋等多金属矿有关的花岗岩体中微粒包体的含量高且个体大,而与矿化无关的岩体中含量少、个体小。对包体的颜色、形态、结构、成分、岩性等方面的综合研究表明,包体为岩浆成因。包体中出现明显的不平衡矿物组舍和结构,发育针状磷灰石晶体,出现嵌晶状石英和碱性长石,显示出岩浆混合的岩相学特征,表明该区中、晚侏罗世花岗岩的成因为壳一幔岩浆混合而成的。研究还表明,区内岩浆混合作用的强弱、基性物质加入的多少都与锡成矿作用的好坏有直接关系。  相似文献   

4.
5.
徐定芳 《地下水》2003,25(3):166-168
湖南省湘西地区山高谷深、碳酸盐岩广布,干旱缺水问题十分突出,如何解决是个难点。在典型岩溶地区保靖县城附近开展勘查工作,查明了该地水文地质条件,找到了单井涌水量5000m^3/d的优质地下水,并建井2口,一举解决了保靖县城的现状供水问题。这项勘查成果不仅解决了当地的实际问题,而且对岩溶石山地区的水文地质研究、勘查和找水建井等奠定了基础。  相似文献   

6.
The aim of this paper is to explore the relationship between legalization of land tenure and people's capacity to compete for and sustain their stake in the urban land market. Two aspects of land regularization are taken into account: the benefits of land regularization (as collateral for investments); and the perverse aspects of disputes over improved land (due to increased scarcity of illegal, but affordable housing land). Most research on illegal urban land has systematically investigated how to legalize illegal settlements to improve the effectiveness of service provision, whilst attracting public investments. But, few understand the underlying factors motivating people to improve and consolidate their houses where no legal tenure exists. The absence of substantial understanding about people's perceptions of their tenure security has encouraged most research to conclude that improving tenure security leads to higher levels of housing consolidation. What this paper shows is that the relationship between people's perceptions of land tenure security and housing consolidation is much more malleable and complex than conventionally assumed. The subtle difference between tenure of the land and tenure of the house indicates that people are willing to invest in their housing conditions almost irrespectively of their land tenure situation. This finding challenges the orthodox views of the property rights school of thought. In addition, this paper contends that what legalization is really doing is to reduce the available land stock for the poorest families, because legalization decreases the amount of illegal land (illegal land is undesirable, but affordable for the poor). The orthodox legal system needs to be revised to include the poorest families in the urban society of the new millennium.  相似文献   

7.
Igor Vojnovic 《GeoJournal》2007,69(4):271-300
Throughout the 20th century, government in the U.S. has gone through significant changes; initially responding to the disorder of early capitalism, and later, to the economic crisis of the 1970s. This article will explore the changes in the U.S. political landscape over the last century, as well as the recent rise of neo-liberalism. In addition, with the analysis of the model laissez-faire municipal government, the City of Houston, the article will illustrate how the basic weaknesses of neoliberalism at the national level are also evident at the local scale of government.
Igor VojnovicEmail:
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8.
The knowledge of the variability, the anthropogenic versus natural origin and corresponding environmental risk for potentially harmful elements in urban topsoils is of importance to assess human impact. The aims of the present study were: (1) to assess the distribution of heavy metals (Sn, Li, Ga, Ba, Fe, Mn, Co, Be, Ti, Al, Hg, Cr, Sb, As, Bi, Pd, Pt, Au, Ni, Cd, Zn, Cu, Pb, Se, Mo, Sc and Ag) in urban environment; (2) to discriminate natural and anthropogenic contributions; and (3) to identify possible sources of pollution. Multivariate statistic approaches (principal component analysis and cluster analysis) were adopted for data treatment, allowing the identification of three main factors controlling the heavy metal variability in Xuzhou urban topsoils. Results demonstrate that Hg, Cr, Sb, As, Bi, Pd, Pt, Au, Ni, Cd, Br, Zn, Cu, S, Pb, Se, Mo, Sc and Ag could be inferred to be tracers of anthropogenic pollution, whereas Al, Ti, Ga, Li, V, Co, Pt, Mn and Be were interpreted to be mainly inherited from parent materials. Iron, Ba, Sn, Pd and Br were interpreted to be affected by mixed sources.  相似文献   

9.
In the northwestern area of Basel, Switzerland, a tunnel highway connects the French highway A35 (Mulhouse–Basel) with the Swiss A2 (Basel–Gotthard–Milano). The subsurface highway construction was associated with significant impacts on the urban groundwater system. Parts of this area were formerly contaminated by industrial wastes, and groundwater resources are extensively used by industry. During some construction phases, considerable groundwater drawdown was necessary, leading to major changes in the groundwater flow regime. Sufficient groundwater supply for industrial users and possible groundwater pollution due to interactions with contaminated areas had to be taken into account. A groundwater management system is presented, comprising extensive groundwater monitoring, high-resolution numerical groundwater modeling, and the development and evaluation of different scenarios. This integrated approach facilitated the evaluation of the sum of impacts, and their interaction in time and space with changing hydrological boundary conditions. For all project phases, changes of the groundwater system had to be evaluated in terms of the various goals and requirements. Although the results of this study are case-specific, the overall conceptual approach and methodologies applied may be directly transferred to other urban areas.  相似文献   

10.
Deborah Potts 《Geoforum》2006,37(4):536-551
During the 1990s, urban livelihoods in Zimbabwe began to suffer a series of economic stresses, which accelerated in 1997 and then accelerated again, with the inception of fast-track land reform, from 2000. This has reduced urban living standards significantly and devastated real urban income levels. After a discussion of the economic and political parameters of this period, this paper links these to empirical changes in the urban livelihoods and perceptions of urban living standards of recent in-migrants to Harare. This draws on a longitudinal database of four surveys of recent migrants to the city conducted in 1985, 1988, 1994 and 2001. Among a range of qualitative issues explored in these surveys has been the question of migrants’ future plans in relation to their intended length of stay in town. It is shown that migrants have been feeling increasingly negative or unsure about their urban experience since structural adjustment began in the early 1990s, and that these perceptions had greatly strengthened by 2001. By the last survey only a small minority felt they would remain permanently in town and most of the migrants from rural areas felt that their living standards in Harare were either worse than rural living standards, or no better. While Zimbabwe’s current political and economic crisis is exceptional, serious urban poverty is a feature across sub-Saharan African countries and it is argued that this has had a depressing effect on net rural-urban migration rates.  相似文献   

11.
The twin facets of urban hydraulic reach - cities’ appropriation of water from surrounding regions and irrigation use of urban wastewater over a growing rural footprint - form an emerging global policy challenge, especially as democratizing societies seek institutional means to address both urban growth and water scarcity. A central concern of this paper is to demonstrate that policy regionalism, as a process-based understanding of institutions and decision-making, better explains the causes, forms, and outcomes of hydraulic reach than do more structural approaches. Hermosillo, Mexico presents an unfolding case of rural-urban tension for control over rivers and aquifers as well as the infrastructure for water capture, storage, conveyance, and wastewater release. The analysis employs process documentation of water transfer and wastewater negotiations through interviews, review of primary documents, and field observations. Hermosillo’s recourse to negotiated agreements and quasi-market transactions, led by an emerging group of public sector innovators, advances understanding of water policy in Mexico by moving beyond prevailing concerns with the water reform’s neoliberal underpinnings to exploration of rapidly changing urban-centered experimentation. We conclude that evolving urban-rural power disparities and water resource landscapes of urban growth will drive continued expansion of hydraulic reach in water-scarce regions globally.  相似文献   

12.
Anthropogenic influence, mainly due to urban and industrial activities and traffic exhaust, may affect urban topsoil via atmospheric contamination and solid waste. Magnetic susceptibility measurements were conducted on 21 urban topsoil samples from the city of Xuzhou, China. High intensities of magnetic susceptibility were detected in the majority of the samples. SEM analysis shows that magnetic minerals are in the form of spherules and mainly due to anthropogenic inputs. The heavy metals Pb, Cu, Zn, Se, Sc, Mo, Fe, and Bi show strong correlations with magnetic susceptibility, and Ag, Ba, Cd, Ni, Cr, Sb, and Sn, on the other hand, show a weak correlation with magnetic susceptibility. Whereas, of these metals studied, only Hg has no significant correlation with the susceptibility. The Tomlinson pollution load index (PLI) also shows significant correlation with the susceptibility (χ). The present study shows that magnetic susceptibility is a fast, inexpensive, and non-destructive method for the detection and mapping of contaminated soils.  相似文献   

13.
We have systematized the effects associated with climate change on urban spaces in Chile reported between 2000 and 2012. The method was based on a review of scientific articles in three databases (Scopus, Web of Knowledge and Scielo) using 32 keywords. Only 14 research papers were found related to climate change in urban spaces, most of which were case studies focused on the capital, Santiago. The main effects on urban spaces were found in four areas: (1) increase in temperature (heat islands, heat waves), (2) health problems in vulnerable populations (cardiac complications, heat stroke, and respiratory diseases), (3) increased demand for water, and (4) damage to the urban infrastructure with resulting risk to the population. In these circumstances the following measures are needed: (1) effective incorporation of the potential impacts of climate change into territorial planning instruments, (2) increased green areas to mitigate the impact of heat waves, (3) limiting of housing or public services in areas at risk, (4) encouraging the design of adaptation plans by involving the vulnerable population, and (5) implementing water conservation measures. We conclude that climate change is causing effects in urban areas that should be considered in the design and expansion of cities.  相似文献   

14.
Following recent scholarship on place and place-making, we identify key challenges for contemporary empirical research using the “Right to the City” as an analytic. We seek to distinguish between the aspirational “right” articulated as a political and conceptual call to arms on one hand, and the “actually existing rights” that are carved out through both formal and informal mechanisms (including political protest) in the everyday city on the other. Actually existing rights are defined not through fiat or via momentary revolutionary acts, but through the durability of relationships between multiple actors, including residents, citizens, states, and corporate agents. We re-articulate urban rights as actually contingent and agonistic properties of the relationships that citizens have with places. This paper uses the historic conflict over community gardens in New York as an illustration of how thinking of rights regimes as multiple, overlapping, and placed helps better illuminate potential political interventions. Thinking of rights and places as plural, overlapping, and contingent is analytically productive because it highlights (rather than overwriting) conflicts between competing articulations of rights and privileges in cities.  相似文献   

15.
Aidan Davison   《Geoforum》2008,39(3):1284-1295
The number and range of contests over the social production of nature is growing. Much environmentalist discourse, however, continues to appeal for unequivocal scientific support on clearly demarcated issues of pure, a-social nature. This paper explores the question of how participants in environmental movements view this demarcation in the context of their own lives. After introducing scholarly critique of dualistic ideas of nature and the ambivalence characteristic of environmentalist conceptions of nature, the paper draws upon a qualitative study with environmentalists in the Australian cities of Melbourne, Perth and Hobart. Inquiring into the interplay of discourse of nature and everyday worlds, interviews revealed a complex interdependence of dualistic and non-dualistic understandings of nature. This ecology of ideas was especially evident in spatial imaginaries of nature. Scientific terminology, social disaffection and pessimism were associated with abstract and mutually exclusive conceptions of society and nature. Reflections on personal experience, however, indicated more flexible and hopeful negotiations in everyday liminal spaces offering ‘the best of both worlds’. It is concluded that environmentalist resistance to dismantling of conceptual boundaries between society and nature may often stem not from failure to appreciate socionatural complexity, but from a strongly felt sense that the self can only truly be found in nature.  相似文献   

16.
In this paper we examine two central concepts of urban metabolism (‘system boundaries’ and ‘flows’), and explore how to approach them as a means to politicise urban metabolism research. We present empirical findings from two case studies of waste management, in Mexico City and Santiago de Chile, looking at: the materiality of waste flows, the actors involved in them, and how waste flows relate to issues of environmental justice. We argue that urban metabolism, as a methodology to understand urban sustainability, has the potential to produce knowledge to trigger urban transformations, and to analyse the social, political and environmental aspects of waste management in urban areas.  相似文献   

17.
Harold A. Perkins 《Geoforum》2011,42(5):558-566
The US Department of Agriculture Forest Service and the Wisconsin Department of Natural Resources coordinate the distribution of urban forestry grants to nonprofits and citizen groups. These granting agencies increased state funding during a period of neoliberal, fiscal austerity in order to channel ecosystem services provided by urban forests. Increased funding is an instance of rollout neoliberalism whereby the fiscally austere state builds market capacity to harness these services as part of an ecologically modernist agenda. A Gramscian perspective and data gathered from 20 in-depth interviews with foresters are used in this paper to theorize how rollout policy is deployed through urban forestry to extend market hegemony to new geographies. This is anything but a smooth process because the public’s perception of urban trees is highly varied. State bureaucracies must build civil sector capacity to educate people about the ecosystem services trees provide as market commodities. In doing so the state’s market-oriented regulatory legitimacy is consolidated through the apparently benign act of promoting urban forestry. This dialectical process limits participation in urban forestry because markets are inherently selective. Yet it potentially gives rise to an alternative political ecology of praxis beyond market ideology when grant recipients participate in the production of urban ecology and recognize their relationship with nature.  相似文献   

18.
武晗 《地质找矿论丛》2020,35(3):363-372
津巴布韦大岩墙蕴含丰富的铬铁矿资源,不同部位成矿特征存在差异。钙碱性铁质基性-超基性岩浆结晶分异过程中伴随着铬铁矿的成矿作用,南部岩浆房两翼300m深度范围内共赋存7个不连续的铬铁矿层,矿层垂向间距30~50m,南部矿层发育优于北部;铬铁矿层厚度多为0.2~1m,铬铁矿层发育于辉橄岩系和辉石岩系的接触部位,三者呈渐变式过渡接触,共同构成典型的韵律结构;两翼矿层产状呈对称状倾向于岩墙的轴部,倾角约为10°~20°;矿石多为自形-半自形微细粒结构,稀疏浸染状及中等浸染状构造,矿石为需选贫铬矿石,w(Cr2O3)=5%~30%,且矿体内Pt+Pd含量可观。大岩墙南段两翼铬铁矿为典型的早期岩浆结晶分异矿床,后期构造运动加剧了矿层的不连续性,并对局部岩矿层产状产生改造,蛇纹石化蚀变形成了指示矿体的标志性斑杂构造岩。  相似文献   

19.
The ascent and emplacement of granites in the upper crust is a major geological phenomenon accomplished by a number of different processes. The active processes determine the final geometry of the bodies and, in some favourable cases, the inverse problem of deducing mechanisms can be undertaken by relying on the geometry of plutons. This is the case of the La Bazana granitic pluton, a small Variscan igneous body that intruded Cambrian rocks of the Ossa-Morena Zone (SW Iberian Massif) in the core of a large late upright antiform. The granite shows no appreciable solid-state deformation, but has a late magmatic foliation whose orientation, derived from field observations, defines a gentle dome. The regional attitude of the main foliation in the country rock (parallel to the axial plane of recumbent folds) is NW–SE, but just around the granite, it accommodates to the dome shape of the pluton. Flattening in the host rock on top of the granite is indicated by boudinaged and folded veins, and appears to be caused by an upward pushing of the magma during its emplacement. The dome-shaped foliation of the granite, geometrically and kinematically congruent with the flattening in the host rock, can be related in the same way to the upward pushing of the magma. The level of final emplacement was deduced from the mineral associations in the thermal aureole to be of 7–10 km in depth. Models of the gravity anomaly related to the granite body show that the granite has a teardrop–pipe shape enlarged at its top. Diapiric ascent of the magma through the lower middle crust is inferred until reaching a high viscous level, where final emplacement accompanied by lateral expansion and vertical flattening took place. This natural example suggests that diapirism may be a viable mechanism for migration and emplacement of magmas, at least up to 7–10 km in depth, and it provides natural evidence for theoretical discussion on the ability of magmatic diapirs to pierce the crust.  相似文献   

20.
Bolivia is a country with high levels of poverty and inequality among its peoples and regions. For the nation and its urban and rural areas, trends in the social and spatial distribution of poverty (and extreme poverty) are identified from 1976 to 2003 using UBN data with minor support where appropriate from poverty lines. The main survey between 1992 and 2001 uses composite and selected UBN to track detailed poverty change for the country’s nine departments, its ten largest cities and a selection of other smaller urban and rural municipalities. Because of rising background increases in population in the various surveyed administrative units, many instances of relative reductions in poverty are accompanied by rising absolute increases. Marked spatial variations in poverty and development in the country over the last several decades are identified as the main driver for the country’s quickening pace of rural–urban migration. As a result, the paper concludes by assessing two different but closely related views. One investigation tests the notion that because more poor people have been living in Bolivia’s cities than in its rural areas since the mid to late 1990s, rapid rural–urban migration has simply shifted the locus of poverty from the countryside to the cities in a process called, the ‘urbanisation of poverty.’ A second, more challenging, investigation assesses the view that the flow of poor rural people to the better serviced urban areas of Bolivia has actually acted to alleviate national poverty levels.  相似文献   

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