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   55篇
  免费   0篇
  2023年   1篇
  2022年   3篇
  2021年   3篇
  2020年   2篇
  2018年   1篇
  2016年   2篇
  2015年   2篇
  2014年   1篇
  2013年   9篇
  2012年   4篇
  2011年   4篇
  2010年   5篇
  2009年   2篇
  2008年   4篇
  2007年   1篇
  2006年   2篇
  2005年   1篇
  2004年   2篇
  2003年   1篇
  2002年   1篇
  1996年   2篇
  1994年   1篇
  1991年   1篇
排序方式: 共有55条查询结果,搜索用时 901 毫秒
31.
The values and significance of heritage resources are often acknowledged but not integrated into the management process. This paper presents a framework for explicitly identifying these resource qualities and applying them to site management. It defines values in terms of a resource's intrinsic (objectively measurable) and extrinsic (largely subjectively measurable) qualities. The derivative assessment of significance then creates direction for decision making where conservation takes precedence over resource exploitation and renewable resource exploitation takes precedence over the exploitation of non-renewable resources. The framework, developed from a study of World Heritage values of the Great Sandy Region, Australia, provides a basis for achieving agreement between resource owners/managers and resource users on the nature of permissible activities using valued resources.  相似文献   
32.
Three main hypotheses are commonly employed to explain diachronic variation in the relative abundance of remains of large terrestrial herbivores: (1) large prey populations decline as a function of anthropogenic overexploitation; (2) large prey tends to increase as a result of increasing social payoffs; and (3) proportions of large terrestrial prey are dependent on stochastic fluctuations in climate. This paper tests predictions derived from these three hypotheses through a zooarchaeological analysis of eleven temporal components from three sites on central California’s Pecho Coast. Specifically, we examine the trade-offs between hunting rabbits (Sylvilagus spp.) and deer (Odocoileus hemionus) using models derived from human behavioral ecology. The results show that foragers exploited a robust population of deer throughout most of the Holocene, only doing otherwise during periods associated with climatic trends unfavorable to larger herbivores. The most recent component (Late Prehistoric/Contact era) shows modest evidence of localized resource depression and perhaps greater social benefits from hunting larger prey; we suggest that these final changes resulted from the introduction of bow and arrow technology. Overall, results suggest that along central California’s Pecho Coast, density independent factors described as climatically-mediated prey choice best predict changes in the relative abundance of large terrestrial herbivores through the Holocene.  相似文献   
33.
Enormous shell middens (“megamiddens”) dating to c. 3000–2000 BP along the West Coast of South Africa were explained initially within a framework based on the Kalahari San ethnography. The overwhelming dominance of marine shell and low densities of artefacts and vertebrate remains were seen as merely the reflection of processing localities. A far more complex picture has emerged recently, with a trend of raising population densities and longer residential permanence between 3500 and 2500 BP. Successive reformulations of the foraging ecology of both marine and terrestrial prey are apparent, with isotopic values from human skeletons and quantified dietary remains showing increased marine food consumption during the megamidden period when compared to other stages. Shellfish collection shifted from a mix of limpets, whelks and black mussels before 3000 BP to the intensified collection of the later from about 2600 BP, with local impact on marine fauna becoming evident at this time. Coastal groups became also increasingly less reliant on large mobile game and more so on small territorial bovids and tortoises as from 3500 BP, with strongest emphasis on this foraging behaviour after 2700 BP. Read against palaeoenvironmental data, this reconstruction is consistent with hunter–gatherer resource intensification models world-wide.  相似文献   
34.
Models derived from foraging theory suggest that high-value prey will be depressed (encounter rates will decrease) relative to low-value prey as human predation intensifies. Numerous case studies in ethnographic and zooarchaeological settings indicate depression of prey is very common. Exceptions to depression are few and have been cited as evidence of conservation and resource management. Reanalysis of pinniped and ungulate data from sites on the Oregon coast indicates that the metapopulation (entire population in the region) of otariids was depressed but a single local population of Steller sea lions exploited over a span of 600 years reached an equilibrium with human predation and was not subsequently depressed. This local population was not historically documented, and thus must have been extirpated by commercial sealing in the late nineteenth century. This singular case of prehistoric epiphenomenal conservation was an unintentional result of human predation that took advantage of the lack of escape behaviors among breeding male Steller sea lions.  相似文献   
35.
The eighteenth century was the heyday of Chinese traditional economic development, that the monetization and sharp increase in the supply of silver stimulated long-distance trade and the rise of regional merchants groups, and increased industrial and agricultural production all reflecting the overall economic development of this period. Along with commoditization and monetization of the economy, monetary supplies and government financial behavior had increasing influence on the economy. The shortage of monetary supplies gave rise to three economic depressions: the early years of the Qing Dynasty, Jiaqing’s reign, and Daoguang’s reign. This study clearly indicates that the scholarly debate over the “stagnation” or “growth” of the Qing economy perhaps merely depends on the period of time and aspect of the economy one examines. The two viewpoints can be somewhat reconciled. Translated by Feng Mei from Qingshi Yanjiu 清史研究 (Studies in Qing History), 2008, (3): 24–43  相似文献   
36.
Limited research has explored associations between blue spaces and mental health, specifically in children. This study assessed links between coastal proximity and depression and anxiety among children in Australia and tested whether duration of residency at current address moderated associations. It also explored associations between within-individual changes in coastal proximity and changes in depression and anxiety. Data were from 2400 children aged 11–12 years in Wave 5 (2012) and aged 14–15 years in Wave 6 (2014) of the national Longitudinal Study of Australian Children. Outcomes were children’s self-reported symptoms of depression and anxiety. Exposure was coastal proximity (<2, 2–<5, 5–<10, 10–<20, 20–<50, and ≥50 km). Linear models were fitted to examine cross-sectional associations and fixed effects models for within-individual associations. After adjustment for potential confounders, findings suggested that those living close to the coast (<2 km) had lower levels of depression than those living the furthest from the coast (≥50 km) during childhood (Wave 5) but not adolescence (Wave 6). No associations were observed with anxiety. There was weak evidence to suggest residency duration moderated associations. No associations were observed for within-individual changes. Further research is needed to understand whether and what characteristics of coastal environments may benefit children’s mental health.  相似文献   
37.
伴随着海势东迁,明代淮安府沿海荡地已出现盐场与民户相互争夺的态势,一方面是盐场为维护既有的盐利而竭力遏制沿海的农业开发,另一方面则是新淤的荡地往往吸引一批批新来的开发者。清初已淤为内陆的安东县垦荡行为在得到康熙帝首肯后,又有了进一步发展。清中期亭场商办这一市场行为也使得灶丁由制盐转向耕田,从而造成了狼在当地的绝迹。两淮盐场民众面对环境变迁积极调适生计,成为清代海州升为直隶州,庙湾、东台由盐场升格为县及清末民初"废灶兴垦"的内在动力。  相似文献   
38.
Examination of growth-stage profiles of shells from nine Northwest Coast shell midden sites shows a majority of senile-stage shells at longer-term residential sites and a majority of mature-stage shells at shorter-term encampments. This pattern indicates less intensive harvest in the vicinity of residential sites, which is consistent with management and conservation of resources for anticipated future needs. Consideration of environmental and taphonomic factors does not account for the observed inter-site variability. Shellfish conservation in the vicinity of residential sites is evident for the period of the past 7000 years.  相似文献   
39.
The relationship between medicine and the arts, literature in particular, has many aspects. One of the most obvious relations is the use of literature as a source for historical studies. Jean-Martin Charcot and his school often appear in French literature at the end of the 19th century. Several aspects will be highlighted in this study, including (1) the ideas about degenerative diseases in the work of Emile Zola, the main author of the naturalistic movement; (2) decadence and spiritism in two transitional novels by Joris Karl Huysmans, who, once supporter of the naturalistic movement, changed his ideas following observations of disease and cure that could not be explained in a scientific way. Charcots work on hysteria and hypnosis, as well as Brown-Séquards rejuvenation experiments with testicular extracts played an important role with this respect; (3) Charcots relationship with the Daudets, in particular his treatment of Alphonses tabes dorsalis and the ambivalent attitude of his son Léon Daudet towards Charcot; (4) the influence of the lectures at the Salptrire on the work of Guy de Maupassant, who attended the lessons in the mid-1880s. The reading of novels and biographies of these authors provides a part of the social context and the cultural atmosphere in Paris at the “fin-de-siècle” when Charcot and his school played an important role in medicine. Moreover, it shows the influence of medicine and science on society as recorded by writers.  相似文献   
40.
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