The etiquette of state-building and modernisation in dependent states: performing stateness and the normalisation of separate development in South Africa     

Peris Sean Jones 《Geoforum》2002,33(1):25-40

The paper reflects upon the continuing allure of state-building and modernisation in peripheral, `new' states and regions. The central argument is to suggest that our understanding of the conflicts surrounding `nation-building' can be improved upon by looking at one of the most powerful symbols of the neo-colonial, economic and institutional dependency and territorial artificiality of the `nation-state'- the South African Bantustan. As enforced state-hood projects, their `newness' and illegality in the eyes of the international community suggest that the Bantustans provide a particularly striking evocation of both the limits of state-building and, above all, the significance of recognition for `newer' states. Efforts to overturn the illegal status and non-recognition of one `independent' Bantustan, namely Bophuthatswana, therefore, illustrate what are widely held to be the modern attributes and evolutionary etiquette (`growth', `building', `development') that need to be `performed' in order to legitimise or normalise a state internationally. To be given a `voice' internationally, states are seemingly required to enact state-hood and sovereignty through a range of normalising rituals associated with state-building. In this case- study, strategies promoting neo-liberal development policies and also clandestine diplomatic and economic manoeuvres were believed by the regime to deliver international recognition. Directed at locating Bophuthatswana within its place in the world, these strenuous efforts also show how crude territorial `divide and rule' tactics alone were not responsible for underpinning the apartheid project. Rather, spaces were provided for discourses and practices of state-led `national' development in the Bantustan periphery. Thought to deliver normality for the renegade Bophuthatswana state, these international and local policies exacerbated and induced further a range of crises at the heart of the Bantustan strategy and apartheid modernisation more generally. These debilitating, and in Bophuthatswana's case, disastrous, tensions between the internal and external realms of state-building point to a more general need to rethink alternatives both to neo-liberalism as well as the rituals associated with state- building.  相似文献   

Entrainment of Glaciomarine Sediments and Formation of Thrust-Block Moraines at the Margin of Sørsdale Glacier,East Antarctica     

Sean J. Fitzsimons 《地球表面变化过程与地形》1997,22(2):175-187

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Chert provenance analysis at the Mack Canyon Site,Sherman County,Oregon: An evaluative study     

Sean C. Hess 《Geoarchaeology》1996,11(1):51-81

Chert is the most frequent lithic raw material in the Columbia Plateau, but archaeologists have made few attempts to link chert artifacts to their quarries in this area. The Mack Canyon Site in north-central Oregon is near a chert source, providing an opportunity to compare provenance analysis techniques. Macroscopic and microscopic visual attributes and element concentrations were determined for 26 samples from six sources in the Columbia Plateau. Additional concentration data from two other sources were included for comparison. Four artifacts were selected from the Mack Canyon Site for comparison to the nearby outcrop. Although all of the artifacts were macroscopically indistinguishable from the local material, microscopic attributes and element concentrations indicate that only one of the artifacts came from the outcrop. Linking chert artifacts and quarries through statistical analysis of element concentrations holds promise for the Columbia Plateau. © 1996 John Wiley & Sons, Inc.  相似文献   

Effectiveness of landscape‐based green infrastructure for stormwater management in suburban catchments          下载免费PDF全文

Sean A. Woznicki  Kelly L. Hondula  S. Taylor Jarnagin 《水文研究》2018,32(15):2346-2361

Land cover changes associated with urbanization have negative effects on downstream ecosystems. Contemporary urban development attempts to mitigate these effects by designing stormwater infrastructure to mimic predevelopment hydrology, but their performance is highly variable. This study used in situ monitoring of recently built neighbourhoods to evaluate the catchment‐scale effectiveness of landscape decentralized stormwater control measures (SCMs) in the form of street connected vegetated swales for reducing runoff volumes and flow rates relative to curb‐and‐gutter infrastructure. Effectiveness of the SCMs was quantified by monitoring runoff for 8 months at the outlets of 4 suburban catchments (0.76–5.25 ha) in Maryland, USA. Three “grey” catchments installed curb‐and‐gutter stormwater conveyances, whereas the fourth “green” catchment built parcel‐level vegetated swales. The catchment with decentralized SCMs reduced runoff, runoff ratio, and peak runoff compared with the grey infrastructure catchments. In addition, the green catchment delayed runoff, resulting in longer precipitation–runoff lag times. Runoff ratios across the monitoring period were 0.13 at the green catchment and 0.37, 0.35, and 0.18 at the 3 grey catchments. Runoff only commenced after 6 mm of precipitation at the decentralized SCM catchment, whereas runoff occurred even during the smallest events at the grey catchments. However, as precipitation magnitudes reached 20 mm, the green catchment runoff characteristics were similar to those at the grey catchments, which made up 37% of the total precipitation in only 10 of 72 events. Therefore, volume‐based reduction goals for stormwater using decentralized SCMs such as vegetated swales require additional redundant SCMs in a treatment train as source control and/or end‐of‐pipe detention to capture a larger fraction of runoff and more effectively mimic predevelopment hydrology for the relatively rare but larger precipitation events.  相似文献   

Proportion of Sewage Sludge to Soil Influences the Survival of Salmonella Dublin and Escherichia coli          下载免费PDF全文

Stephanie Ellis  Sean Tyrrel  Emma O'Leary  Karl Richards  Bryan Griffiths  Karl Ritz 《洁净——土壤、空气、水》2018,46(4)

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Investigating a time‐shift extended imaging condition in a Kirchhoff pre‐stack depth migration algorithm          下载免费PDF全文

Gareth Shane O'Brien  Sean Joseph Delaney  Michael Igoe  John Doherty  Andrew Colhoun 《Geophysical Prospecting》2018,66(4):688-706

Extracting true amplitude versus angle common image gathers is one of the key objectives in seismic processing and imaging. This is achievable to different degrees using different migration techniques (e.g., Kirchhoff, wavefield extrapolation, and reverse time migration techniques) and is a common tool in exploration, but the costs can vary depending on the selected migration algorithm and the desired accuracy. Here, we investigate the possibility of combining the local‐shift imaging condition, specifically the time‐shift extended imaging condition, for angle gathers with a Kirchhoff migration. The aims are not to replace the more accurate full‐wavefield migration but to offer a cheaper alternative where ray‐based methods are applicable and to use Kirchhoff time‐lag common image gathers to help bridge the gap between the traditional offset common image gathers and reverse time migration angle gathers; finally, given the higher level of summation inside the extended imaging migration, we wish to understand the impact on the amplitude versus angle response. The implementation of the time‐shift imaging condition along with the computational cost is discussed, and results of four different datasets are presented. The four example datasets, two synthetic, one land acquisition, and a marine dataset, have been migrated using a Kirchhoff offset method, a Kirchhoff time‐shift method, and, for comparison, a reverse time migration algorithm. The results show that the time‐shift imaging condition at zero time lag is equivalent to the full offset stack as expected. The output gathers are cleaner and more consistent in the time‐lag‐derived angle gathers, but the conversion from time lag to angle can be considered a post‐processing step. The main difference arises in the amplitude versus offset/angle distribution where the responses are different and dramatically so for the land data. The results from the synthetics and real data show that a Kirchhoff migration with an extended imaging condition is capable of generating subsurface angle gathers. The same disadvantages with a ray‐based approach will apply using the extended imaging condition relative to a wave equation angle gather solution. Nevertheless, using this approach allows one to explore the relationship between the velocity model and focusing of the reflected energy, to use the Radon transformation to remove noise and multiples, and to generate consistent products from a ray‐based migration and a full‐wave equation migration, which can then be interchanged depending on the process under study.  相似文献   

Development of push moraines in deeply frozen sediment adjacent to a cold-based glacier in the McMurdo Dry Valleys,Antarctica     

Sean Fitzsimons  Jamie Howarth 《地球表面变化过程与地形》2020,45(3):622-637

Previous studies of push moraines have concluded that structural architecture is controlled by a combination of stress exerted by flowing ice and the rheology of the deforming sediment. However, the relationship between deformation processes and the thermal/hydrologic conditions within the sediment remains ambiguous. Using a combination of surface mapping, logging exposures and ground penetrating radar we examine the relationships between surface morphology, material properties and development of deformation structures in deeply frozen sediment that has been deformed by Joyce Glacier, a cold-based glacier in the McMurdo Dry Valleys. The structural architecture of the push moraines is characterized by a combination of brittle and ductile deformation structures that have produced a structurally complex pattern of thrust faults, low angle listric thrusts and recumbent folds that extend 400 m beyond the glacier margin. Deformation is ductile where the ice concentration exceeds c. 65% volume and predominantly brittle where the ice concentration is less than c. 65%. The change in rheology reflects transition in behaviour from the material having a predominantly frictional character when the ice is limited to pore spaces to a non-frictional character in which strength is primarily determined by the cohesive strength of the ice. This work shows that glaciotectonic deformation can occur in deeply frozen permafrost where there is no liquid pore water. We conclude that the presence of liquid porewater is not a necessary condition for the development of glaciotectonic deformation or for the formation of push moraines. © 2019 John Wiley & Sons, Ltd.  相似文献   

Raman study of shock features in plagioclase feldspar from the Mistastin Lake impact structure,Canada     

Tianqi Xie  Gordon R. Osinski  Sean R. Shieh 《Meteoritics & planetary science》2020,55(7):1471-1490

Plagioclase feldspar is one of the most abundant minerals on the surface of the Earth, the Moon, and Mars, and is also commonly found in meteorites. Studying shock effects in feldspar thus provides us with fundamental information about impact cratering processes on planetary bodies. In this study, plagioclase from monomict and polymict breccias, impact melt rocks, and shock‐metamorphosed target rocks, from throughout the Mistastin Lake impact structure, Canada, was examined using 514 nm laser Raman spectroscopy. As one of the very few impact structures with anorthosite in the target rocks, the Mistastin Lake impact structure provides a unique opportunity to study shocked plagioclase displaying progressive shock metamorphic features. A series of microscopic features was observed within plagioclase, including twins, needle‐like inclusions, planar features, and alteration. The lack of planar deformation features is notable. Raman spectra of these features suggest that this technique is capable of differentiating and classifying shock features in low to moderately shocked rocks. Caution should be exercised, however, as Raman spectra collected from unshocked plagioclase references with known compositions indicate that peak width and peak ratio of the Raman peaks in lower wave number region (<350 cm^?1) and the main signature peaks around 500 cm^?1 vary with chemical composition and crystal orientation. Data collected from diaplectic glass suggest that Raman features are efficient in distinguishing crystalline plagioclase and diaplectic glass. We also observed significant variations in the Raman intensities collected from diaplectic glass, which we ascribe to the localized disorder or inhomogeneity of shock pressure and temperature throughout the target.  相似文献   

Spitzer observations of M83 and the hot star, H ii region connection     

Robert H. Rubin  Janet P. Simpson  Sean W. J. Colgan  Reginald J. Dufour  Katherine L. Ray  Edwin F. Erickson  Michael R. Haas  Adalbert W. A. Pauldrach  Robert I. Citron 《Monthly notices of the Royal Astronomical Society》2007,377(4):1407-1418

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Regime-dependent streamflow sensitivities to Pacific climate modes cross the Georgia–Puget transboundary ecoregion     

Sean W. Fleming  Paul H. Whitfield  R. D. Moore  Edward J. Quilty 《水文研究》2007,21(24):3264-3287

The Georgia Basin–Puget Sound Lowland region of British Columbia (Canada) and Washington State (USA) presents a crucial test in environmental management due to its combination of abundant salmonid habitat, rapid population growth and urbanization, and multiple national jurisdictions. It is also hydrologically complex and heterogeneous, containing at least three streamflow regimes: pluvial (rainfall-driven winter freshet), nival (melt-driven summer freshet), and hybrid (both winter and summer freshets), reflecting differing elevation ranges within various watersheds. We performed bootstrapped composite analyses of river discharge, air temperature, and precipitation data to assess El Niño–Southern Oscillation (ENSO) and Pacific Decadal Oscillation (PDO) impacts upon annual hydrometeorological cycles across the study area. Canadian and American data were employed from a total of 21 hydrometric and four meteorological stations. The surface meteorological anomalies showed strong regional coherence. In contrast, the seasonal impacts of coherent modes of Pacific circulation variability were found to be fundamentally different between streamflow regimes. Thus, ENSO and PDO effects can vary from one stream to the next within this region, albeit in a systematic way. Furthermore, watershed glacial cover appeared to complicate such relationships locally; and an additional annual streamflow regime was identified that exhibits climatically driven non-linear phase transitions. The spatial heterogeneity of seasonal flow responses to climatic variability may have substantial implications to catchment-specific management and planning of water resources and hydroelectric power generation, and it may also have ecological consequences due to the matching or phase-locking of lotic and riparian biological activity and life cycles to the seasonal cycle. The results add to a growing body of literature suggesting that assessments of the streamflow impacts of ocean–atmosphere circulation modes must accommodate local hydrological characteristics and dynamics. Copyright © 2007 John Wiley & Sons, Ltd. The copyright in Paul H. Whitfield's contribution belongs to the Crown in right of Canada and such copyright material is reproduced with the permission of Environment Canada.  相似文献