首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   28篇
  免费   0篇
  2023年   1篇
  2020年   1篇
  2018年   1篇
  2017年   1篇
  2016年   1篇
  2015年   2篇
  2013年   9篇
  2010年   2篇
  2009年   2篇
  2008年   2篇
  2007年   1篇
  2006年   3篇
  1977年   1篇
  1975年   1篇
排序方式: 共有28条查询结果,搜索用时 15 毫秒
11.
Direct identification of fodder provisioning in individual animals is a previously unexplored area that has important implications for determining animal husbandry strategies in prehistory. In this study, foddering practices are examined in modern domestic and wild caprines from Mongolia (Baga Gazar'in Chuluu) through carbon and nitrogen analyses of bulk sampled dentin collagen in molar teeth. Foddered caprines display significantly different δ13C values compared to non-provisioned caprines. This pattern reflects the consumption of C4 plants year-round by provisioned caprines while non-provisioned caprines ingest C4 plants only during the summer months. Provisioned caprines also display significantly different nitrogen isotopic values relative to non-provisioned animals. The difference in nitrogen isotopes between wild and foddered animals may be due to increased access in quality graze through foddering by domestic caprines, which results in improved nutrition and extended lactation periods, or enriched δ15N of fodder plants relative to background flora. Differences in tooth wear between sampled wild and foddered animals may also contribute to the observed δ15N differences.  相似文献   
12.
We examine public attitudes toward vulnerability and evacuation in hurricane natural disasters. Using the results of an opinion survey in a coastal, New England state, we find important differences in how men and women, and Whites and minorities perceive natural disasters. Race, gender, and geographic proximity to the coast affect how vulnerable people believe their residence is to a major hurricane, while government officials and media reporting telling people to evacuate influence evacuation decisions. In order to avoid future breakdowns, governments need to understand the different information processing approaches of various groups of people.  相似文献   
13.
R. Williams  G. Taylor  C. Orr 《Archaeometry》2020,62(6):1145-1163
Portable X-ray fluorescence (pXRF) is now widely used for detecting the elemental composition of a material. Elemental analysis can enhance archaeological interpretations, such as mapping, preservation analysis and identifying anthropogenic activities. However, validated and reproducible protocols for analysing archaeological soil are still required. The elemental concentrations detected with three sets of preparation methods were compared: in-situ (no preparation), in-field (analysing through plastic bags) and ex-situ analysis (laboratory-based preparation). Influential factors were also investigated: calibration parameter, moisture, homogeneity, sieve size and soil type. In-field analysis attempted to improve reliability without offsite processing, but instead substantially reduced elemental concentrations and skewed the proportional distributions. Ex-situ analysis significantly increased elemental concentrations and reduced variation. Proportional distribution was different between the three methods, but unchanged following homogenizing and sieving. These comparisons demonstrated that ex-situ analysis maximizes detection and ensures consistent samples.  相似文献   
14.
15.
16.
Over the last four decades, there has been surprisingly little advance in the quantitative morphometric analysis of Palaeolithic stone tools, especially compared to that which has taken place in biological morphometrics over a comparable time frame. In Palaeolithic archaeology's sister discipline of palaeoanthropology, detailed quantitative morphometric, geometric morphometric, and even 3D geometric morphometric analyses are now seen almost as routine. This period of relative methodological stasis may have been influenced by the lack of homologous landmarks on many lithic tools (essential for any comparative analysis), especially core-based technologies of the Lower Palaeolithic. Archaeological field conditions may also prohibit the use of expensive and delicate precision instruments in certain cases. Here we present a crossbeam co-ordinate caliper that – crucially – both geometrically locates and measures distances between morphologically homologous landmarks upon lithic nuclei via a single protocol. Intra- and inter-observer error tests provide evidence that error levels associated with the instrument fall within acceptable ranges. In addition, we present empirical examples of application in the form of a multivariate analysis of 55 discrete morphometric variables, and a 3D geometric morphometric analysis of co-ordinate landmark configurations derived from Pleistocene lithic nuclei (i.e. ‘cores’ sensu lato). We also introduce to lithic studies some techniques for the study of shape variation that have previously been used with success in biological morphometric analyses. We conclude that use of an instrument such as the crossbeam co-ordinate caliper may provide a useful adjunct to traditional techniques of lithic analysis, particularly in developing a quantitative morphometric approach.  相似文献   
17.
In the summer of 1988, television viewers across the United States and Canada were transfixed by images of Yellowstone National Park seemingly consumed by flames as wildfires burned almost one million acres of land within the Greater Yellowstone Area. In the wake of the fires, the governments of the United States and Canada both reassessed their policy approaches to fire management and came to two very different conclusions. The purpose of this study is to explore how the wildfire problem was defined in Canada and the United States in the wake of the Yellowstone wildfires, why these definitions were so different, and what effects these different definitions have had on fire policy. As a subtext, this research also highlights the challenges inherent in science‐based decision making.  相似文献   
18.
Levallois cores and products were manufactured by hominin populations distributed across wide regions of Africa and Eurasia. Levallois technology remains an important focus for research in Palaeolithic archaeology, yet quantitative morphological comparisons of Levallois core morphology from different regions remain rare. Here, utilizing Levallois cores from Africa, the Near East, Europe, and the Indian subcontinent, patterns of morphological variability in the shape of the Levallois flaking surface and core outline (margin) shape were examined for patterns of variability and stability across regions using 3D geometric morphometrics. The multivariate statistical shape analyses undertaken revealed a clear pattern: that is, the greatest levels of shape variability in Levallois cores is evident in the form of their outline (planform) shape. Conversely, the geometrical relationship between the margin of the Levallois cores and their topological surface morphology was relatively uniform. This pattern of variability was evident in terms of variation both across regions and between cores from the same locality. These results indicate that the outline form of such cores was a less important variable than the geometric/topological properties of the surface morphology and, in particular, the relationship between the margin of the core and those variables. These results have implications for why it has been reported that replicating such cores in modern experiments is a particularly difficult task. The specific interrelationship between the geometric properties of the core and the core margin provide further evidence that Levallois core technology would be unlikely to emerge from the context of opportunistic migrating platform reduction strategies (such as those seen in many Mode 1 industries). If, as is widely suggested, Levallois cores were deliberate products in Pleistocene contexts, these results also hint that relatively sophisticated means of social transmission (i.e. teaching) may have been required to sustain their production over time and space.  相似文献   
19.
Fans seeking engagement with Jane Austen and her fictional creations seek out heritage locations linked both temporally and geographically to her life and works. This article adopts a multidisciplinary framework that triangulates fan studies, literary criticism, and heritage studies to analyse three Austen-linked fan spaces: Chawton Cottage (Austen’s former home and now a museum), Lyme Park (‘Pemberley’ in B.B.C.’s 1995 adaptation of Pride and Prejudice), and two Austen-themed literary walks. I argue that the fan’s desire for connection is by no means an organic or natural quality of the heritage site itself. Rather, creating connections between the revered object (Austen) and the physical spaces that purport to contain her necessitates imaginative work on the part of the literary tourist. That such performative work is necessary in both the ‘real’ (Chawton) and ‘fictional’ (Lyme Park) locations demonstrates the problematic nature of previous critical emphases on the authenticity – or lack thereof – of such spaces. The significance of the fan’s pilgrimage to Austen-linked heritage sites lies not in the author to be ‘found’ there but in how the tourist actively constructs ‘their’ Jane by inscribing her presence – and those of her characters – onto these spaces.  相似文献   
20.
Although recent deaths of multiple couriers on the road have raised awareness of the dangers of on-demand food delivery, there remains limited government regulation of the industry in many jurisdictions. In this article, we argue that the labour conditions of platform couriers in Australia constitute a case of necrocapitalism (Banerjee), a contemporary form of accumulation through which organisational structures harness the power of debilitation and death for economic gain. After contextualising food delivery within the Australian gig economy, our analysis underscores how necropower operates through courier labour. We illustrate three dimensions: how this form of labour entails corporeal risks and harms; how these harms are heightened by platform infrastructures; and how strategic regulatory inaction maintains necropolitical orders. The article concludes with a reflection on how this contemporary example of necrocapitalism illuminates intersecting vectors of domination underpinning the logics and practices of platform governance.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号