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The point of departure for this article is the contemporary tendency towards localisation of politics in the context of neo-liberal globalisation. Mediated through institutional reforms, political discourses and localised struggles, this localisation of politics produce new and transformed local political spaces. The purpose of the article is to examine the capacity of popular movements to use and transform such political spaces within the South African housing sector. This analysis is done through a combination of conceptual examination of political space and actor capacity and a concrete case study of the political strategies and capacities of The South African Homeless People’s Federation. The article argues that the Federation has utilised political relations at different scales to mobilise resources such as land and subsidies for housing for its members. It has also influenced the formulation of housing policies through its discourses and practical experiences with people-driven housing processes. In consequence the Federation’s ability to function as a civil/political movement has granted them a certain capacity to participate in the complicated process of turning de jure rights to adequate shelter into de facto rights for the urban poor as citizens of a democratic South Africa. 相似文献
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Acta Geochimica - Goethite (α-FeOOH) is one of the most abundant minerals on the Earth surface, occurring in temperate, tropical and equatorial climates. Fe in goethite can be substituted by... 相似文献
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Kristian Bjarnøe Brandsegg Erik Hammer Richard Sinding-Larsen 《Natural Resources Research》2010,19(1):45-62
Multivariate analysis is employed to investigate the structure of variations within highly heterogeneous data. Traditionally,
principal component analysis (PCA) is run by analyzing the entire wireline log and using PCA scores to characterize variability
within and between lithologies. In this paper, we propose a technique using only specific subsets of all well records to quantify
reservoir heterogeneity due to second order lithological variability. These subsets are chosen from uniform lithofacies parts
of the wireline log in order to reduce the variability in the correlation matrix that otherwise would cause lithological changes.
The purpose is to assess the efficiency of structured PCA in analyzing small-scale heterogeneity that is captured by wireline
logs but often masked by traditional PCA approaches. This paper shows that a structured PCA procedure based upon special lithological
units is superior to an unstructured PCA, when the focus is within lithology variations. This structured procedure is applied
to data from the Heidrun field, offshore mid-Norway. The results demonstrate clear benefits from added insight into the variability
of a complex fluviodeltaic heterolithic sequence that poses great challenges to hydrocarbon development. 相似文献
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Joanna Staneva Victor Alari Øyvind Breivik Jean-Raymond Bidlot Kristian Mogensen 《Ocean Dynamics》2017,67(1):81-101
The effect of wind waves on water level and currents during two storms in the North Sea is investigated using a high-resolution Nucleus for European Modelling of the Ocean (NEMO) model forced with fluxes and fields from a high-resolution wave model. The additional terms accounting for wave-current interaction that are considered in this study are the Stokes-Coriolis force, the sea-state-dependent energy and momentum fluxes. The individual and collective role of these processes is quantified and the results are compared with a control run without wave effects as well as against current and water-level measurements from coastal stations. We find a better agreement with observations when the circulation model is forced by sea-state-dependent fluxes, especially in extreme events. The two extreme events, the storm Christian (25–27 October 2013), and about a month later, the storm Xaver (5–7 December 2013), induce different wave and surge conditions over the North Sea. Including the wave effects in the circulation model for the storm Xaver raises the modelled surge by more than 40 cm compared with the control run in the German Bight area. For the storm Christian, a difference of 20–30 cm in the surge level between the wave-forced and the stand-alone ocean model is found over the whole southern part of the North Sea. Moreover, the modelled vertical velocity profile fits the observations very well when the wave forcing is accounted for. The contribution of wave-induced forcing has been quantified indicating that this represents an important mechanism for improving water-level and current predictions. 相似文献
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Willem G.M. van der Bilt Jostein Bakke Kristian Vasskog Torgeir Røthe Eivind W. N. Støren 《Geology Today》2016,32(6):213-218
Glaciers show a sensitive and rapid response to climate shifts. Associated changes in ice extent drive variations in the production of rock flour, the suspended product of glacial erosion. These glacigenic sediments may accumulate in downstream lakes, continuously recording glacier history. Consequently, the lacustrine sediment records of such glacier‐fed lakes represent valuable palaeoenvironmental archives that help constrain past climate variability. In this paper, we discuss the multi‐disciplinary methodological toolbox that is applied to fingerprint a glacier signal from such lake sediments. Special emphasis is placed on dating methods, which transform stratigraphical data into climate time series, allowing us to distinguish leads and lags between archives. We also elaborate on techniques that are used to validate sediment‐based glacier signals and resolve their climate signature. Finally, we conclude with a brief outlook on new research avenues such as proxy data–climate model comparisons. 相似文献