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The origin and dispersal of the first human inhabitants of the Polynesian Triangle have been studied from many perspectives and significant progress in our understanding of Polynesian prehistory has derived from an intermingling of linguistics, archaeology, and genetics. Contributions from the ethnographic record, however, have been limited by the dearth of comparative methods that are useful for reconstructing prehistory and identifying and analyzing cross-cultural trends. For more than fifty years, cladistic phylogenetic methods have been used to reconstruct the evolutionary history of biological systems from contemporary trait distributions. These rigorous methods are applied herein to reconstruct the prehistoric evolution and dispersal of Polynesian bark cloth, using ethnographic data recorded since European contact with Polynesian cultures. Contrary to expectation given the earlier settlement of Western Polynesia, the Eastern Polynesian bark cloth traditions retained many ancestral features. In contrast, a suite of innovations appear in the Western Polynesian bark cloth traditions and it is asserted herein that the distribution of these traits may be associated with the rise of the Tongan maritime Empire. Within Eastern Polynesia, the pattern of diversification of bark cloth traditions is consistent with the breakdown of interaction spheres late in the settlement era.  相似文献   
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A new accessible and easy method for studying past fire events using ‘dry sediments’ is presented. The method was developed for analysing samples from 17 locations in the Ambato Valley, NW Argentina, to study fire regimes in the area. Based on earlier researchers’ methods, guidelines to use microcharcoals in ‘dry’ sediments as a palaeoenvironmental proxy are provided. The procedures outlined include sampling/extraction in the field, preparations of the samples, laboratory analysis and quantification of the samples. The new approach was useful to meet the objectives and answer the questions initially proposed in our research about past fire regimes affecting the past Aguada society.  相似文献   
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There has been an impressive stride in the research on policy feedback effects on mass publics over recent years. However, we lack systematic evidence on how large such policy feedback effects are in the literature. This article provides a review of 65 published studies and quantifies the findings and key themes in the policy feedback literature. The results show a great degree of heterogeneity in the domains and outcomes being studied and in the effects of policies on the public. In line with the findings from narrative reviews, feedback effects are greater for outcomes related to political participation and engagement. Last, the review sheds light on important theoretical and methodological limitations to be addressed in future research.  相似文献   
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Understanding how archaeological sites are abandoned is a vital part of archaeology. This paper explores abandonment as a phenomenon in a worldwide context, particularly in relation to sites with evidence of fire, and with a special focus on the South-Central Andes. I evaluate the patterns from an area of the Argentinian Andes and discuss the disappearance of the Aguada Culture, one of the central cultures in Argentinian prehistory, using evidence from the core area the Ambato Valley. I conclude that environmental factors were not the sole or determining source of stress, but rather part of a social–environmental dimension in which several factors combined to push a society into a vulnerable situation. In terms of the abandonment of the Aguada settlements in the Ambato Valley, the study shows that frequent forest fires might have played a role, but based upon the regularity of such events as seen in the sediment history, it is unlikely that these were the only factor in the process of abandonment of the valley.  相似文献   
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Public monuments in colonial Nairobi were visual links to the British empire, and served as a means of asserting imperial power. During this period, colonial memories and identities were inscribed into Nairobi’s landscape by the dominant group, the elite of the European population. However, at the moment of Kenya’s achievement of independence from colonial rule, such identities and assertions of power were challenged as statues were removed from the city. This paper examines the forces behind the decolonisation of Nairobi’s monumental landscape and how this landscape visualised the changing political and cultural contexts of the city. Comparisons are made with the removal of statues from Sudan, India and the Democratic Republic of Congo in order to situate the Kenyan experience. Through a comparative examination of the decolonisation of Nairobi’s monumental landscape, this paper illustrates how the removal of public monuments from the city was exploited by both the coloniser and the colonised.  相似文献   
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It has been noted that innovation seems to take place to a higher degree in clusters than elsewhere and we have lately seen a worldwide wave of emerging cluster initiatives and similar innovation policy projects. Some of these are realistic efforts based on existing regional strengths and partly existing cluster structures. Most, however, are grasping at straws. The latter is especially true when it comes to technologies such as IT and biotech. We could subsequently add a new label—“pathetic clusters”—to the already existing list of embryonic, emerging, world-class or stagnating clusters. But what do we make of such “pathetic clusters” (are they really pathetic)? Although economic geographers often tend to explain innovation (competitiveness) by looking at cluster dynamics, in such accounts, the cluster concept itself can actually function as an innovation, imposing similar effects on the economy as more familiar types of innovation would, i.e. by creating a local competitive edge. It is reasonable to believe that if “pathetic clusters” play important roles in regional economies, then they do so in the form of social and organizational innovations rather than as Porterian drivers of innovation and industrial dynamics on a large scale. This function of the cluster concept—as a local innovation—is the focus of the paper at hand.  相似文献   
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