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   173篇
  免费   4篇
  2023年   3篇
  2021年   1篇
  2019年   6篇
  2018年   6篇
  2017年   6篇
  2016年   6篇
  2015年   4篇
  2014年   5篇
  2013年   50篇
  2012年   2篇
  2011年   6篇
  2010年   3篇
  2009年   3篇
  2008年   5篇
  2007年   2篇
  2006年   2篇
  2005年   3篇
  2004年   3篇
  2003年   2篇
  2002年   4篇
  2001年   3篇
  2000年   6篇
  1999年   2篇
  1998年   1篇
  1995年   1篇
  1994年   3篇
  1993年   1篇
  1992年   3篇
  1990年   1篇
  1989年   2篇
  1987年   1篇
  1985年   1篇
  1984年   3篇
  1983年   3篇
  1982年   1篇
  1981年   3篇
  1980年   2篇
  1978年   5篇
  1977年   3篇
  1976年   5篇
  1974年   2篇
  1972年   1篇
  1970年   1篇
  1962年   1篇
排序方式: 共有177条查询结果,搜索用时 31 毫秒
21.
22.
This paper presents the results of in situ monitoring of waterlogged burial contexts in southwest Scotland. The sites investigated are Iron Age crannogs (lake dwellings) which have a proven waterlogged archaeological component, and which are being assessed as part of a national program of study by the Scottish Wetland Archaeology Programme (SWAP) team. A monthly monitoring program commenced in July of 2004. To date, monitoring of water levels, pH, and redox potential, has been undertaken for a period of 17 months in order to encompass any seasonal variability at the sites studied. The results have proven robust in that an ‘ideal’ site for in situ preservation has been identified from the five sites investigated, and the monitoring has highlighted external variables and seasonal impacts that have the potential to influence the long-term in situ preservation at the remaining sites studied. In general, these results have expanded upon our knowledge of the potential for the preservation of existing archaeological remains within such contexts. This study represents the first stage of monitoring aimed at developing a holistic understanding of in situ conditions at the crannog sites studied in southwest Scotland.  相似文献   
23.
24.
25.
26.
In more recent years, Australia's relations with the countries of Latin America have taken on more importance as the trade and investment links between the two regions have grown. Besides this recent activity, Australia has a long history of diplomatic relations with the countries of Latin America, even though the links between the two regions have at times been fairly superficial. This relationship, like many others, has tended to concentrate on mainly trade relations and, despite Latin America's often turbulent political history, has not been affected much at all by political issues. The purpose of this article is to analyse the development of foreign policy links between Australia and the countries of Latin America in their formulative stage between 1901 and 1973.  相似文献   
27.
28.
This paper presents preliminary results of new radiocarbon dating of human, faunal and fish skeletal remains from a number of the cemeteries from the Middle and Lower Dnieper Basin, Ukraine. The results appear to demonstrate the presence of a radiocarbon reservoir effect during the Neolithic–Eneolithic periods, the first time that this has been identified in this region. The data indicate that the radiocarbon reservoir effect is currently only evident during these periods, and not in the earlier Epipalaeolithic–Mesolithic periods, prompting the suggestion that the radiocarbon reservoir effect is associated with elevated fish consumption from the Neolithic period onwards.  相似文献   
29.
The field system of the Wadi Faynan in southern Jordan was fed by an ancient combination irrigation system that incorporated runoff farming and diversion irrigation techniques. The hydraulic characteristics of this system were most probably designed to take advantage of the confluence of three tributary streams. A theoretical model of discharge produced by runoff is based on contemporary ground conditions and historic climate reconstructions. The design principles of the main hydraulic features are examined and velocity and discharge measurements in principal conveyance irrigation channels are reconstructed. The design of this hydraulic system took into account the environmental constraints and opportunities of the area and maximized different sources of water in the catchment using various techniques of water collection.  相似文献   
30.
This paper presents the results of new stable isotopes (carbon and nitrogen) analysis of human, faunal and fish remains from thirteen cemeteries from the Middle and Lower Dnieper Basin, Ukraine. The results are integrated with earlier analyses, undertaken solely on human samples, in order to provide a comprehensive overview of subsistence across the Upper Palaeolithic through to Eneolithic periods in this region. This is the first time that a combined sample of human, faunal and fish remains has been studied in order to interpret subsistence strategies across these periods in Ukraine. The total dataset comprises 113 samples of human, faunal and fish remains, 59 of which include new analyses of faunal and fish remains that have not previously been made available for study (Table 1). The analysis of the faunal and fish remains allows for a consideration of trophic levels which indicates that the consumption of freshwater fish occurs from the Epipalaeolithic period onwards. Whilst the majority of the cemeteries and the individuals therein cluster in relatively tight groups, there is a significant offset between the human and faunal samples due to the consumption of freshwater resources. The fish samples analysed in the study appear to exhibit a relatively random distribution when compared to the other samples analysed. In general, freshwater resources remain significant through until the end of the Neolithic period and into the Eneolithic period at the sites investigated.  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