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The dispersal of Homo sapiens across the New World is one of the greatest chapters in the history of our species; however, major questions about this late Pleistocene diaspora remain unanswered. Two contentious issues are the timing of colonization of the Bering Land Bridge and origin of Clovis, which at 13,000 calendar years ago is the earliest unequivocal complex of archaeological sites in temperate North America, known by its specialized fluted spear points. One hypothesis is that fluting technology emerged in Beringia and from there was carried southbound, with fluted points becoming the diagnostic “calling card” of early Paleoindians spreading across the Western Hemisphere. Fluted points have long been known from Alaska, yet until now they have never been found in a datable geologic context, making their relationship to Clovis a mystery. Here we show that a new archaeological site at Serpentine Hot Springs, Bering Land Bridge National Preserve, Alaska, contains fluted points in a stratified geologic deposit dating to no earlier than 12,400 calendar years ago. Our results suggest that Alaska's fluted-point complex is too young to be ancestral to Clovis, and that it instead represents either a south-to-north dispersal of early Americans or transmission of fluting technology from temperate North America. These results suggest that the peopling of the Americas and development of Paleoindian technology were much more complex than traditional models predict.  相似文献   
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In recent years, three notable trends have emerged in the gender and development landscape: the increasing use of sport as a tool to achieve gender and development objectives (SGD); the expanding involvement of transnational corporations (TNCs) in creating, funding and implementing development programs; and the ‘girling’ of development. The last trend has largely been facilitated by the proliferation of the global ‘Girl Effect’ campaign, or ‘the unique potential of 600 million adolescent girls to end poverty for themselves and the world’ (Girl Effect 2011). This article reports on findings from a global ethnography – involving semi-structured interviews, participant observation and document analysis – that considered how sport-oriented Girl Effect interventions impact the lives of girls they target. Using a Girl Effect-focused partnership among a TNC (based in Western Europe), an international nongovernmental organization (NGO) (based in Western Europe) and a Southern NGO (based in Uganda) as a case study, this article examines how SGD programs for Ugandan girls encourage them to become ‘entrepreneurs of themselves’ (Rose 1999) equipped to survive in the current global neoliberal climate using social entrepreneurial tactics such as training to be martial arts instructors combined with activities such as cultivating nuts. Results show how Girl Effect-oriented SGD programs that focus on social entrepreneurship tend to overlook the broader structural inequalities and gender relations that marginalize girls in the first place. I conclude by suggesting that future studies must further explore the socio-economic, cultural and political implications and consequences that social entrepreneurship and ‘economic forms’ of SGD interventions hold for girls.  相似文献   
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