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Precipitation patterns in semi-arid river systems of the southwestern U.S. make stream-aquifer exchanges an important source of water in perennial rivers. Nonetheless, the spatial and temporal evolution of surface and ground water interaction are not fully understood. This research utilizes diurnal temperature oscillations as a tracer of vertical water fluxes by applying Stallman's analytical solution to a series of temperature time series recorded in the stream and in the streambed of the San Pedro River. Temperature measurements were recorded at four spatial extents using a nested hierarchy during four different periods since last flood. Time since last flood did not affect vertical fluxes significantly, but fluxes exhibited spatial dependence at lengths of 6-24 m. Stream geomorphic features influenced the magnitude of vertical fluxes; runs were more downwelling than riffles. The data suggests that the spatial distribution of vertical fluxes becomes more homogeneous as time since last flood increases.

There has, in the last quarter of a century, been an increased interest in the /Xam narratives that form the major part of the nineteenth century archive of materials collected by Lucy Lloyd and Wilhelm Bleek in Cape Town from /Xam informants. This has resulted in a proliferation of writing about the Bleek and Lloyd collection and its contents. The critical examination of some of this body of writing forms part of the project of this thesis. The other aim of the thesis is to provide a close reading of certain of the /Xam texts themselves. This thesis is based on the view that the first of these projects has only been attempted in a cursory and indirect fashion and that the second, namely the close reading of/Xam texts, has not yet been undertaken on a scale that parallels the range and complexity of the materials or which exhausts the interpretative possibilities they offer. This thesis aims to fill some of these gaps in the literature without claiming that a comprehensive or definitive study is possible in so wide and rich a field. Postmodern and postcolonial theory has emphasised the discursive and ideological nature of the language of both hermeneutics and literature. In my consideration of the /Xam texts and the writing that has been produced in relation to them, I attempt to consistently foreground the historicity and textuality of my own practice and the practices of the materials with which I am working. In this regard I question, especially, two assumptions about the /Xam narratives: that they are primarily aetiological and that their chief character, /Kaggen, the Mantis, is a trickster. / Thesis (Ph.D.)-University of KwaZulu-Natal, Pietermaritzburg, 2006.

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In light of the civil unrest surrounding the tech industry’s corporate shuttle buses, this paper examines factors that determine the percentage of commuters from Greater San Francisco to Silicon Valley. By using aggregate characteristics of two departing cities (San Francisco and Oakland) and 34 receiving cities in Silicon Valley in 2006 and 2011, the study shows that distance alone is statistically significant across various specifications. Relative median housing values and relative unemployment rates mattered at times. These findings can help businesses and governments in the area make educated decisions regarding employment and residential locations.

Graduation date: 1979