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1.
Cheryl McEwan 《Geoforum》2003,34(4):469-481
This paper considers the ongoing political transformations in South Africa in the context of debates about good governance and participatory democracy. It first appraises the current transformations of local government in South Africa, focusing specifically on relationships between gender equality and citizenship on the one hand, and local government policy, legislation, and community participation on the other, and then explores meanings of participation and how they inform approaches towards local socio-economic development. The findings of primary research conducted with civil society organisations and black women in communities in the Cape Town metropolitan area are explored through three interrelated themes. First, the model of structured participation that is central to South Africa’s democratic transformation is assessed from the perspective of black women. Second, cultures of alienation, both within local governance structures and amongst black women and the extent to which recent restructuring is combating or contributing to these are explored. Third, how participation policies are dealing with conflict within and between target groups are analysed, whether stakeholder group politics obliterate important differences in interests and whether alternative structures might be more effective in terms of women’s participation and empowerment. Finally, the findings are interpreted in relation to theoretical concepts of good governance and participatory democracy, and the potential and problems of realising South Africa’s transformation process toward developmental local government are assessed.  相似文献   

2.
Since the late 1970s, the UK has experienced a series of changes in the mechanisms of governing local economic development. This paper considers the methodological consequences of these recent changes. Drawing on two local elite-based case studies, involving semi-structured interviews, we reflect on our acquired ‘situated knowledge’ and argue that this is related to the contingent nature of our respective research access. We advocate that an approach sensitive to ‘research situatedness’ (with respect to the politics of time as a ‘research moment’) is essential to avoid over generalising from our experiences. To address this concern, the paper offers two concepts for debate – political-temporal contingency and the mode of entry.  相似文献   

3.
Worm‐like trace fossils, sometimes of large size, have regularly been reported from the otherwise generally poorly‐fossiliferous Permo‐Triassic continental red beds of the East Devon coast, southwest England. Selected examples are discussed here to outline the difficulties involved in elucidating the true producers of these burrows and interpreting their significance in the local palaeoenvironment.  相似文献   

4.
In Venezuela, kimberlites have so far only been found in the Guaniamo region, where they occur as high diamond grade sheets in massive to steeply foliated Paleoproterozoic granitoid rocks. The emplacement age of the Guaniamo kimberlites is 712±6 Ma, i.e., Neoproterozoic. The Guaniamo kimberlites contain a high abundance of mantle minerals, with greater than 30% olivine macrocrysts. The principal kimberlite indicator minerals found are pyrope garnet and chromian spinel, with the overwhelming majority of the garnets being of the peridotite association. Chrome-diopside is rare, and picroilmenite is uncommon. Chemically, the Guaniamo kimberlites are characterized by high MgO contents, with low Al2O3 and TiO2 contents and higher than average FeO and K2O contents. These rocks have above average Ni, Cr, Co, Th, Nb, Ta, Sr and LREE concentrations and very low P, Y and, particularly, Zr and Hf contents. The Nb/Zr ratio is very distinctive and is similar to that of the Aries, Australia kimberlite. The Guaniamo kimberlites are similar in petrography, mineralogy and mantle mineral content to ilmenite-free Group 2 mica kimberlites of South Africa. The Nd-Sr isotopic characteristics of Guaniamo kimberlites are distinct from both kimberlite Group 1 and Group 2, being more similar to transitional type kimberlites, and in particular to diamondiferous kimberlites of the Arkhangelsk Diamond Province, Russia. The Guaniamo kimberlites form part of a compositional spectrum between other standard kimberlite reference groups. They formed from metasomatised subcontinental lithospheric mantle and it is likely that subduction of oceanic crust was the source of this metasomatised material, and also of the eclogitic component, which is dominant in Guaniamo diamonds.  相似文献   

5.
6.
The ‘Maresfield Map’ is a map that purports to show features pertinent to the old iron industry in the Sussex Weald of southern England in 1724. It first appeared in a journal published by the Sussex Archaeological Society in early 1913, at roughly the same time as the formal publication by the Geological Society of London of papers introducing the discovery of the ‘remains’ of what became known as ‘Piltdown Man’ to the world. Piltdown Man was eventually revealed as fraudulent in 1953, followed by the Maresfield Map in 1974. Experiments in replication now show that the Maresfield Map is a sort of ‘treasure map’ (in a negative sense), which points fairly accurately to the supposed find‐spot of Piltdown Man, along with a coded accusation against Charles Dawson. The map's compiler is thought to have been L.F. Salzmann, the editor of the journal in which the map appeared. As such, the map represents the only such denunciation to have been published in the open literature in Dawson's lifetime, albeit a cryptic one. Mr Salzmann's possible motives are explored.  相似文献   

7.
Field observations of ‘laterites’ in southern and eastern Australia and in southern Africa reveal a variety of ferruginous horizons and crusts referred to herein as ferricretes. Their geomorphic and stratigraphic relationships with bedrock, sediments and soils indicate formation throughout long intervals of geological time in landscapes which are also characterised by zones of bleached and iron-mottled materials. There does not appear to be a genetic relationship between the ferricretes and the weathered zones in the sense of the so-called ‘laterite profile’. Many of the ferricretes form part of existing soil profiles.

Petrographic studies of a variety of ferricretes have identified three broad categories: (a) ferruginised bedrock; (b) Fe-impregnated and -indurated sediments, including sands, clays and organic sediments; and (c) ferricretes of complex sedimentary and pedogenic origin. Type-(a) and -(b) ferricretes characteristically have simple fabrics, often with single-generation, secondary Fe-oxides. Type-(c) ferricretes have complex fabrics, with many generations of hematite, goethite and in some variants, gibbsite, in the matrix and in ferruginous clasts and pisoliths. Maghemite is a common constituent of the pisoliths. The characteristics of ironstone gravelly duplex soils, which are common in the contemporary landscapes, provide the framework for a model involving multiple stages in the development of these ferricretes.

The origins of the various secondary oxide minerals in ferricretes are assessed on the basis of knowledge about the formation of these minerals in pedogenic environments. Examples are given of the intricate patterns of distribution of the minerals in thin section from which definitive data may be obtained on environmental conditions for integration with field-based geomorphic studies.  相似文献   


8.
Clive Barnett  David Land   《Geoforum》2007,38(6):1065-1075
This paper questions Geographers debates about ‘caring at a distance’ and the ‘geographies of responsibility’, focussing on the treatment of the theme of partiality in ethics and justice. Debates in Geography often present partial commitments as morally or politically problematic on the grounds that they prioritize self-interest, exclusionary, and geographically restricted ways of relating to others. We outline how debates about caring at a distance and the geographies of responsibility frame partiality as a problem to be overcome. We argue that Geography’s engagements with moral philosophy are premised on faulty assumptions about the sorts of influences people are liable to act upon (one’s that privilege causal knowledge as the primary motivating force), and also flawed assumptions about the sorts of problems that academic reasoning about normative issues is meant to address (the assumption that people are too egoistical and not altruistic enough). We use the theme of generosity as an entry point to argue that partiality and finitude might be the conditions for any ethical–political project that de-centres the motivation of practical action away from the sovereign self towards responsive and attentive relations of encounter with the needs of others. Understanding generosity as a modality of power suggests a revised programme for geographical investigations of the intersection between ethics, morality and politics: one which looks at how opportunities to address normative demands in multiple registers are organized and transformed; at the ways in which dispositions to respond and to be receptive to others are worked up; and how opportunities for acting responsively on these dispositions are organized.  相似文献   

9.
Laboratory experimentation on whole-rock ‘Rock-Eval’ pyrolysis has shown that the characterization of organic matter through the use of a modified van Krevelen diagram, in which the hydrogen and oxygen indices are substituted for the atomic H/C and O/C ratios, produces questionable results. The hydrogen and oxygen indices have been found to be strongly affected by both matrix mineralogy and level of organic enrichment. It appears, therefore, that although the modified van Krevelen diagram maybe useful for tracing evolutionary pathways as organic matter matures, it can be very misleading when used to assess kerogen type.  相似文献   

10.
At least in France the sub-region is a living spatial entity. It is partly the heir of structures established in the pre-industrial epoch, receiving from the ancient ‘pays’ and old administrative structures the sense of belonging to a certain social cadre held by a population. For a long period the weak development of an hierarchy of urban services made most towns of equal standing, limiting the growth of commercial relationships and the dimensions of functional spaces. With the growth of an hierarchy of urban services, and improvement in accessibility the functional units have enlarged, breaking unequally the former cadres, and creating polarisations of various scales. Where the metropolises have not become dominant the sub-regions remain sufficiently autonomous, around a town of medium size. More often, in every case where local polarisations have been progressively effaced, and economic spaces have enlarged immeasurably and where the administrative region is seeking identity, the sub-region is reasserted as a social functional space in the pattern of customary life-style, and appears acceptable as a level in the operation of spatial management.  相似文献   

11.
12.
Tunnel excavation is a coupled three-dimensional problem dealing with two different structures: lining and rockmass. For a simple application it is useful to develop simplified methods by treating the problem as plane strain. If the problem of tunnel face advance presents an axisymmetric geometry, then we show that the major parameter governing the ground–interface–lining interaction is the convergence of the tunnel U0 at the moment of the lining installation. The ‘New Implicit Method’ (NIM) presented in this paper makes use of principles similar to those of the ‘convergence–confinement’ method, but it provides a better appreciation of the coupled behaviour of rockmass and lining. For independent time constitutive laws (elasticity and plasticity), we point out that the convergence U0 depends not only on the mechanical behaviour of the rockmass and on the distance from the tunnel face, as predicted by the ‘convergence–confinement’ method, but also on the stiffness of the lining previously set. We present the ‘NIM’ for elastic and perfect elastoplastic rockmasses without dilatancy for many criteria. The development of this new method is based on the results of tunnel calculations with an axisymmetric FEM numerical model that takes into account the three-dimensional aspect of the problem. Using this method is simple and its results agree well with the FEM numerical results. Its accuracy is highly satisfactory for a geotechnical study.  相似文献   

13.
The renewed investigations of the Benot Ya'aqov site resulted in the discovery of a bar-like depositional structure located on the eastern bank of the Jordan River (southern Hula Valley, Israel). Its interdisciplinary study resulted in the identification of four lithofacial fluvial units, all tilted (20–25 degrees dip) and all containing archaeological and paleontological finds. The structure, caused by diverse resistance of the local lithology and tectonic activity, is assigned to the Benot Ya'aqov Formation. The material culture is assigned to the Acaheulian Industrial Complex and is indicative of a continuous occupation of the Benot Ya'aqov embayment during Middle Pleistocene times.  相似文献   

14.
Summary Southern African natural gravel and soil road materials are mostly residual soils, residual weathered rocks or pedocretes which are inferior in quality to materials found in northern Europe and North America. Although they can be used to effect substantial savings in costs, the conditions under which marginal and nonstandard materials can be successfully used are not yet well-understood, and further research is necessary. Greater political and engineering acceptance of appropriate standards and risk would probably enable more unpaved roads to be surfaced.  相似文献   

15.
In Morocco, it is generally considered that post‐Hercynian vertical movements were limited to the Atlas system, the passive continental margin and the Rif. Apatite FT and He ages from the Moroccan Meseta (Rehamna and Zaer Massif) document instead two episodes of subsidence and exhumation in Jurassic‐Early Cretaceous and during the Late Cretaceous to Neogene. The Meseta subsided to >3 km depth during the Late Triassic to Middle Jurassic and was exhumed to the surface before the Late Cretaceous, during the rift and post‐rift stages of Central Atlantic opening. Erosion of the exhuming rocks is responsible for a thick package of terrigenous sands found in the Moroccan offshore and elsewhere along the NW Africa margin. About 1 km of subsidence affected the Meseta during the Late Cretaceous to Eocene. During the Neogene, these areas were brought back to the surface in association with bimodal folding with wavelengths of 100–150 km and >500 km.  相似文献   

16.
17.
An analysis is presented of the non-linear creep effects around a deep circular tunnel driven in ‘squeezing’ ground. The time-dependent behaviour of the geotechnical medium is described by means of a simple viscoplastic rheological model capable of approximating primary, secondary and tertiary creep behaviours. It is shown that tertiary creep can be allowed for by providing a suitable law governing the variation of some material parameters (such as viscosity) with stresses and strains. The basic operations of the ‘evolutive’ procedure adopted for time integration are outlined. Along each time integration step, quadratic variations of the stress and strain fields and linear variations of the material parameters are assumed. The results of various finite element analyses are presented concerning both lined and unlined cases. For the lined cases, the influence of the liner stiffness and of the time elapsed between the end of excavation and the liner installation is considered.  相似文献   

18.
19.
Martin Buttle   《Geoforum》2007,38(6):1076-1088
Over the last decade a range of social banks and Community Development Finance Initiatives (CDFIs) have developed a social investment sector in the UK. Some of these organisations emphasise their belief in partnership, association, reconnecting and re-humanising the relationship between investors with borrowers in order to reap social returns. ‘Ethical’ investors are encouraged to take sub-market returns on their investments in order for surpluses to be distributed to the organisations’ beneficiaries. Some key theoretical and political questions include: how are investors enrolled in these initiatives? What discourses of ethics are constructed and how do investors relate to them? How do these discourses relate to debates in geography revolving around ‘caring at a distance’? Drawing on work on the Charity Bank and the Industrial Common Ownership Fund (ICOF), this paper analyses how these discourses are constructed and mediates the relationship between investors and borrowers. It explores stakeholders both investors’ and borrowers’ perceptions of these activities as well as the way investors construct their own reasons for investing.  相似文献   

20.
Dinosaurs and related ‘prehistoric’ fossil vertebrates have captured the imagination of children and adults from almost their first discovery in the early nineteenth century, and it is not surprising that physical representations of them would be made. From these early beginnings, there must be thousands of different prehistoric models out there in the ‘Dinosaur Toy universe’. Even before the advent of the movie ‘Jurassic Park’, every toy shop had a display area devoted to them, and specialist toy manufacturers were bringing out very scientifically accurate models. But I want to concentrate on my favourites from the pre‐‘Jurassic Park’ era and particularly those available in the USA and Britain. Some may look a bit like tail‐dragging swamp dwellers, but I like them and so do many other collectors. As well as those the avid dinosaur collector might come across at model fairs and online I will also mention some that are more likely to be seen in museum displays.  相似文献   

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