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   288篇
  免费   30篇
  2023年   3篇
  2022年   1篇
  2021年   1篇
  2020年   11篇
  2019年   21篇
  2018年   21篇
  2017年   19篇
  2016年   20篇
  2015年   13篇
  2014年   13篇
  2013年   62篇
  2012年   10篇
  2011年   12篇
  2010年   14篇
  2009年   6篇
  2008年   6篇
  2007年   4篇
  2006年   6篇
  2005年   4篇
  2004年   3篇
  2003年   4篇
  2002年   5篇
  2001年   3篇
  2000年   4篇
  1999年   4篇
  1998年   3篇
  1997年   2篇
  1996年   1篇
  1995年   1篇
  1994年   4篇
  1993年   1篇
  1992年   3篇
  1991年   1篇
  1989年   3篇
  1988年   4篇
  1987年   1篇
  1984年   2篇
  1983年   4篇
  1982年   2篇
  1981年   1篇
  1980年   3篇
  1979年   1篇
  1978年   5篇
  1977年   4篇
  1976年   1篇
  1975年   1篇
排序方式: 共有318条查询结果,搜索用时 15 毫秒
101.
The imperial honours system, David Cannadine has argued, was a means for binding together ‘the British proconsular elite’ and ‘indigenous colonial elites’ throughout the settler colonies and dominions of the British Empire (Cannadine, David. Ornamentalism: How the British Saw Their Empire. London: Penguin, 2002). Yet in settler colonies like Australia and New Zealand indigenous populations were marginalised and often disregarded, and it was local white elites who became knights of St Michael and St George, the Bath and the British Empire. Focusing on Australia and New Zealand, this article explores the complex relationships Aboriginal and Māori leaders have had with honours during the twentieth century. Building upon Cannadine's analysis, I examine the ways in which indigenous leaders navigated the political complexities involved in the offer of an honour, and how their acceptance of awards was received by others, shedding light on how honours systems intersected with post-war struggles for indigenous rights in the former dominions.  相似文献   
102.
Abundant wood remains and buried trees have been found in the western part of Lithuania near Zakeli?kiai and Lyduv?nai on Dubysa River (a tributary of Nemunas River) where deposits are rich in organic remnants and buried soils. In Zakeli?kiai and Skiru?iai sections of Dubysa River oxbow sediments were investigated by various methods (dendrochronological, carbonate, granulometric, pollen and mollusc fauna analysis). In addition, these sections were dated using the radiocarbon method. Samples were collected from deposits of Dubysa River outcrops. The studied oxbow lakes have existed for more than 5 thousand years (from ca. 4300 BC to 1000 AD). During this period organic rich deposits with trees and branches were formed in the oxbow lake. This indicates that at the end of Atlantic, during Subboreal and in the early Subatlantic periods there was a forest growing that contained mainly oaks which were falling down into an oxbow lake and later were covered by sandy and silty deposits. The granulometry of alluvial deposits, as well as the mixture of medium-grained sand and silt show different stages of Dubysa River palaeochannel formation: riverbed and oxbow lakes. Three climate warming cycles were revealed according to carbonate analysis data in all investigated sections. The rheophile thermophilous Holocene age molluscs species Bithynia tentaculata L., Unio cf. crassus Philipsson, Pisidium amnicum (Müller), Theodoxus fluviatilis (Linnaeus) have been found. The pollen composition and sequences have been divided into five local pollen assemblage zones (LPAZ) and described according to pollen spectra in each zone. In this way it is possible restore palaeoclimatic coherent evolution, trends and cyclical change.  相似文献   
103.
There are various possibilities for the selection and scaling of ground motions for advanced seismic assessment of buildings using nonlinear response-history analyses. As part of an on-going project looking at building-specific loss assessment in Italy, this article highlights a number of challenges currently facing the use of conditional spectra for ground motion selection in practice, essentially related to the limited amount of seismic hazard information that is publicly available. To illustrate the points being made, the challenges faced when trying to develop conditional spectra and select spectrum-compatible accelerograms for a rock site in Napoli, Italy, are described and the seismic assessment results obtained for a number of reinforced concrete wall structures are presented. Aside from providing practitioners with an appreciation of the potential difficulty associated with using conditional spectra for record selection, this technical note should also motivate national authorities to provide more background information on national seismic hazard data and detailed guidance for record selection.  相似文献   
104.
This study proposes an “optimal” spectral acceleration-based intensity measure (IM) to assess the collapse capacity of highly inelastic frame structures vulnerable to the P-delta effect. The IM is derived from the geometric mean of the spectral pseudo-acceleration over a certain period interval. The lower bound period of the averaging interval is related to the mode in which 95% of the effective modal mass is exceeded. The upper bound period is 1.6 times the fundamental period. This IM provides minimum, or close to the minimum, dispersion for frames with different fundamental periods of vibration, or number of stories.  相似文献   
105.
106.
107.
108.
109.
The revised International Health Regulations (IHR) entered into force on 15 June 2007. In accordance with this new international treaty, every member state of the World Health Organization has been given five years in which to review their existing health systems and structures, and where necessary, improve their capacity for the detection, reporting, assessment of, and response to public health emergencies of international concern. Of course, for developed countries, it is unlikely that establishing and maintaining these core capabilities will be difficult. For many less developed countries, however, the revised IHR obligations pose a challenge on a number of fronts. This article explores some of the challenges that less developed countries face in meeting their new IHR obligations prior to discussing the role that the Australian government can play in assisting its Asia-Pacific neighbours achieve these measures.  相似文献   
110.
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