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   113篇
  免费   3篇
  2023年   2篇
  2021年   1篇
  2020年   1篇
  2019年   3篇
  2018年   3篇
  2017年   4篇
  2016年   3篇
  2015年   3篇
  2014年   1篇
  2013年   29篇
  2012年   5篇
  2011年   5篇
  2010年   6篇
  2009年   3篇
  2008年   4篇
  2007年   4篇
  2006年   2篇
  2005年   3篇
  2004年   2篇
  2003年   3篇
  2002年   1篇
  2001年   2篇
  2000年   2篇
  1999年   2篇
  1997年   3篇
  1996年   1篇
  1995年   3篇
  1994年   2篇
  1992年   1篇
  1991年   1篇
  1988年   1篇
  1987年   1篇
  1984年   1篇
  1982年   2篇
  1981年   2篇
  1979年   2篇
  1976年   1篇
  1975年   1篇
排序方式: 共有116条查询结果,搜索用时 15 毫秒
91.
92.
93.
94.
Pole, M., December, 2008. The record of Araucariaceae macrofossils in New Zealand. Alcheringa 32, 405–426. ISSN 0311-5518.

The Araucariaceae have a long record in New Zealand, extending back to the Jurassic at least, and Araucaria extends back to at least the Late Cretaceous. This paper reviews the macrofossil record of the family and presents new information based largely on the leaf cuticle record. Agathis, which is the only genus of the family currently growing in New Zealand, has no record before the Cenozoic. All specimens previously identified from pre-Cenozoic strata clearly belong to other taxa or do not show characteristic features of the genus. Araucariaceae macrofossils are virtually ubiquitous in the Cretaceous assemblages of New Zealand but are conspicuous by their absence or rarity in Palaeocene deposits. Their demise may be an expression of events at the Cretaceous–Palaeogene boundary.  相似文献   
95.
This paper examines the impact of animal manure on δ15N and δ13C values in a legume, Celtic Black broad bean (Vicia faba). In a field experiment, V. faba was cultivated in plots treated with farmyard manure and pure sheep manure. The results indicate that highly intensive manuring can increase δ15N values in beans, stems, leaves and pods. In comparison, manuring had a relatively small impact on δ13C values. In terms of palaeodietary reconstructions, the high δ15N values in very intensively manured beans (+3?‰) are equivalent to the trophic-level effect. Based on the experimental results, it is suggested that high δ15N values in archaeobotanical remains of V. faba may be attributable to small-scale cultivation with intensive manuring.  相似文献   
96.
97.
98.
In this work, two-photon absorption fluorescence is used as a non-destructive method to detect the presence of paint upon an archaeological sample. The objective was to recover writing that, due to the discoloration caused by the passage of the time, was barely readable. The technique has been successfully applied to determine the consular date painted upon the neck of a Dressel 1A amphora found in the Roman village of Iesso (Guissona), in Catalonia. The identification of the consular date provides a terminus post quem for the foundation date for the city as well as a starting date for the Roman colonization of Hispania Citerior.  相似文献   
99.
How New is the New Local Governance? Lessons from the United Kingdom   总被引:1,自引:0,他引:1  
In recent times, a conventional wisdom concerning the governance of cities has emerged. It revolves around the contention that policy and planning frameworks are increasingly closed off from public and democratic accountability, in order to facilitate the pursuit of efficiency over equity objectives. The implication is that 'old' styles of governance were more open and accountable, while the 'new' seek to close off debate and streamline procedures. Yet the evidence to sustain such claims seems limited; this paper situates the policies and practices of local government in the UK within a historical perspective, and develops the contention that the claimed differences between old and new styles of governance are overdrawn. Using empirical material from two UK cities, we demonstrate that there are significant continuities in the procedures and practices of policy-makers, in terms of policy objectives, styles and modes of accountability. In this sense, greater clarity is required in terms of what constitutes both the old and new modes of local governance in the British cities.  相似文献   
100.
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