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Robert J. Hoard Steven R. Holen Michael D. Glascock Hector Neff J. Michael Elam 《Journal of archaeological science》1992,19(6)
Cryptocrystalline silicates from the Chadron Formation were widely used by prehistoric human groups in the Great Plains of North America. There are two documented quarry areas: Flattop Butte in Colorado and the White River Badlands of South Dakota. Cryptocrystalline silicates from these sources are visually indistinguishable, making it difficult to determine the sources of artefacts found at archaeological sites. In this investigation, neutron activation analysis is used to distinguish the two sources. This technique also identifies lithic material from the Clovis-age Eckles site in Kansas as being from Flattop Butte. 相似文献
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A new generation of greenways has emerged in recent years, the most ambitious of which are nationwide, interconnected networks of multi-use, multi-purpose greenways and trails, clustered under a single national vision. However, because these initiatives have been the focus of so few research studies, opportunities to glean lessons from their planning and implementation have been limited. This paper contributes to addressing this knowledge gap by presenting a comparative account of two networks, the Trans Canada Trail in Canada and Sendero de Chile in Chile. Using document analysis and interviews with officials closely involved in their development, the evolution of both networks is documented over time, emphasizing similarities and differences related to their planning and implementation. Both initiatives have faced significant challenges in reaching their connection goals and have availed themselves of a diverse range of opportunities and strategies to advance their agendas. A simple model of a virtuous cycle is proposed to highlight the positive feedback—between political and public support, sustained funding, partnership development, accessibility for urban residents, and connectivity of the network—generated by sustained network expansion over time. It is hoped that the insights offered from this analysis may offer guidance to inform the development of similar scale projects elsewhere. 相似文献
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Susan Buckingham Monica Degen Elodie Marandet 《Gender, place and culture : a journal of feminist geography》2018,25(3):334-350
This article explores the ‘more-than-work’ aspects of the lives of vulnerable women who street-sex work. Particularly, we are interested in the differences between the women’s experiences, within the broader context of power structures as manifested in neoliberal cities. Few studies have explored this aspect of street-sex workers’ lives and theorisations of the co-creation of environments tend to elide the experiences of the most vulnerable people. Specifically, we explore the relationships that these women have with two environments: the quotidian (where they undertake routine everyday activities), and the gentrified (relating to changes in the spaces in which they live and work). We find that their experiences are extremely local, and heavily contingent on the services made available to them (or not) by the statutory and third sectors, and the emotional contacts they make, particularly in third sector support services. This challenges some of the literature which suggests a separation of ‘home’ and ‘work’, and which finds close associations between women who street-sex work. While places designed by the third sector are more responsive to these women, they are also more vulnerable to closure through lack of funding. This contributes to a significant degree of ontological non-linearity and ontological insecurity in these women’s lives. 相似文献
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Monica Hwang 《The American review of Canadian studies》2018,48(3):297-313
Using data from Canada’s General Social Survey, this article assesses ethno-racial differences in social trust. Bivariate findings reveal that the three most culturally distinctive minorities—visible minorities, the French, and Indigenous Peoples—exhibit the lowest trust of all groups. Multivariate analyses show that controls for “ethno-cultural markers” (religion, language, immigration status), socioeconomic influences (education, income), and social engagement indicators (voluntary association activity, ethnic diversity of friendships) explain the lower trust between the French and, less so, among visible minorities. Socioeconomic factors partly account for lower trust among Indigenous Peoples, but they still express comparatively low social trust even with controls. The article discusses how interpretations focusing on “social distance” and “social boundaries” processes help in understanding social trust differences across Canada’s major ethno-racial communities. 相似文献
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The Jaws Effect: How movie narratives are used to influence policy responses to shark bites in Western Australia 总被引:1,自引:0,他引:1
Christopher Neff 《Australian journal of political science》2015,50(1):114-127
This article examines the way political actors use film narratives to influence policymaking following shark bites. To analyse these relationships I propose the concept of the Jaws Effect, where film-based historical analogies are used as a political device to frame real-life events in ways that make the events governable and prejudice certain policy options. Three elements of the Jaws Effect are reviewed including the intentionality of the shark, perception that these events are fatal and the belief that ‘the shark’ must be killed. These elements are applied to a case study of policy responses to shark bite episodes in Western Australia in 2000, 2003, 2011 and 2014. The reasons why this political device may not always work are also suggested.
本文研究了政治主体以什么方式使用电影叙事来影响鲨鱼咬人之后的政策制定。笔者提出“《大白鲨》效应”的概念,也就是以取自电影的历史类比为政治手段来言说现实生活中的事件,让事件根据言说者的需要,不利于某些政策选择。本文分析了《大白鲨》效应的三要素:鲨鱼的目的性;现实生活的事件性命攸关;鲨鱼必须被杀死。笔者将三要素用于研究2000、2003、2011和2014年西澳大利亚鲨鱼要人事件之后的政策反应。文章也探讨了为什么这种政治手法并不总能凑效。 相似文献
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Radon Predictions with Geographical Information System Covariates: From Spatial Sampling to Modeling
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Radon (Rn) is a potentially toxic gas in soil which may affect human health. Assessing Rn levels in soil gas usually requires enormous efforts in terms of time and costs, since the sampling protocol is very complex. In most cases, the variable under study is sparsely sampled over the domain and this could affect the reliability of the spatial predictions. For this reason, it is useful to incorporate, into the estimation procedure, some auxiliary variables, correlated with the in soil gas Rn concentrations (primary variable) and more densely available over the domain. On the basis of this latter aspect, it is even better if the covariates are derived from a geographical information system (GIS). In this article, the Rn sampling protocol used during a measurement campaign planned over a risk area is described and the process of deriving GIS covariates considered as secondary information for predicting the primary variable is clarified. Then, multivariate modeling and prediction of the Rn concentrations over the domain of interest are discussed and a comparative study regarding the performance of the prediction procedures is presented. Rn prone areas are also analyzed with respect to urban and school density. All these aspects can clearly support decisions on environmental and human safeguard. 相似文献
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Monica Green 《Children's Geographies》2014,12(2):189-204
Innovative curriculum frameworks that support children as active researchers and designers in everyday learning contexts remain unprioritized in school settings. Design literacies challenge and expand existing curriculum structures at a time when state and national curriculum privilege literacy and numeracy testing. Drawing on a broader ethnographic study that examined children's inhabitation of school food gardens through pedagogies of food production, ecology and design in three Australian primary schools [Green, M. 2011. “Place Matters: Pedagogies of Food, Ecology and Design.” Unpublished PhD, Monash University Churchill Victoria], this paper focuses on the design literacies or ‘design-centered pedagogy’ [McLaren, S. 2008. “Learning for Engagement: Lose the Ring-Fencing.” Paper presented at the Technology Education Research Conference: Exploring Technology Education: Solutions to Issues in a Globalised World, Gold Coast, Queensland] that supported children's engagement with everyday learning in one school community. Semi-structured and ‘walking interviews’ provide rich data for understanding the contributions of design and design processes in a garden-based curriculum. When linked to a framework of sustainability, design literacies can expand learning opportunities that deepen their connection to everyday places. 相似文献
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