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   1664篇
  免费   58篇
  2020年   19篇
  2019年   25篇
  2018年   57篇
  2017年   48篇
  2016年   38篇
  2015年   34篇
  2014年   38篇
  2013年   560篇
  2012年   31篇
  2011年   37篇
  2010年   28篇
  2009年   24篇
  2008年   38篇
  2007年   23篇
  2006年   25篇
  2005年   27篇
  2004年   27篇
  2003年   13篇
  2002年   23篇
  2001年   20篇
  2000年   19篇
  1999年   15篇
  1998年   21篇
  1997年   15篇
  1996年   15篇
  1995年   18篇
  1994年   17篇
  1993年   18篇
  1992年   16篇
  1991年   11篇
  1990年   14篇
  1989年   11篇
  1988年   20篇
  1987年   12篇
  1986年   16篇
  1985年   28篇
  1984年   25篇
  1983年   21篇
  1982年   29篇
  1981年   17篇
  1980年   20篇
  1979年   29篇
  1978年   19篇
  1977年   28篇
  1976年   10篇
  1975年   25篇
  1974年   20篇
  1973年   11篇
  1970年   10篇
  1969年   11篇
排序方式: 共有1722条查询结果,搜索用时 31 毫秒
101.
102.
103.
104.
105.
This article explores the questions and intrigue arising from the appearance of the Russian ship Shilka at the port of Seattle in December 1917. The first Russian vessel to reach American shores since the Bolshevik seizure of power, the Shilka raised both local and national fears of collusion between Soviet agitators and domestic radicals, especially the militant Industrial Workers of the World (IWW). The article challenges the conclusions of an earlier article which argued against any substantive contact or understanding between the Russian seamen and locals. Relying on the memoirs of a Bolshevik crew member, the recollections of Seattle radicals and the reports of US Bureau of Investigation and Naval Intelligence agents, this article instead demonstrates the genuine presence of Bolshevik agitators and propaganda aboard the Shilka and their secret interaction with IWW activists. It also reveals a leak on the Russian end, a leak that both stimulated and perplexed American investigators.  相似文献   
106.
In an era of rapid geographical data acquisition, interpretations of remote sensing products are an integral part of many undergraduate geography degree schemes but there are fewer opportunities for collection and processing of primary remote sensing data. Unmanned Aerial Vehicles (UAVs) provide a relatively inexpensive opportunity to introduce the principles and practice of airborne remote sensing into field courses, enabling students to learn about image acquisition, data processing and interpretation of derived products. Two case studies illustrate how a low-cost “DJI Phantom Vision+” UAV can be used by students to acquire images that can be processed using Structure-from-Motion photogrammetry software. Results from a student questionnaire and analysis of assessed student reports showed that using UAVs enhanced student engagement and equipped them with data processing skills. The derivation of bespoke orthophotos and Digital Elevation Models has the potential to provide students with opportunities to gain insight into various remote sensing data quality issues, although additional training is required to maximize this potential. Recognition of the successes and limitations of this teaching intervention provides scope for improving future UAV exercises. UAVs are enabling both a reconstruction of how we measure the Earth’s surface and a reconstruction of how students do fieldwork.  相似文献   
107.
This article demonstrates that the Profumo affair, which obsessed Britain for large parts of 1963, was not simply a political scandal, but was also an important cultural event. Focussing on the production of The Keeler Affair, a feature film that figured prominently in contemporary coverage of the scandal but which has been largely overlooked since, the article shows that this film emerged from a situation in which cultural entrepreneurs, many of them associated with the satire boom, sought to exploit the scandal for financial gain. Many Profumo-related cultural products found an audience, and thus formed an integral part of, and helped to shape public attitudes towards, the Profumo affair. However, these products did not go uncontested, and resistance to them, and especially to the idea that Keeler might benefit materially from her role in the scandal, speak to concerns about cultural mediations of sex, politics and humour in early-1960s Britain.  相似文献   
108.
Archaeology over the past fifty years has shown that in the early 9th century Western Europe experimented with a coalescing of states affirmed by a common reform ideology and with it increased communication to regions beyond. At different speeds, regions of Western Europe adopted this new strategy known as the correctio. Within a generation, the correctio gave rise to a new ‘feudal’ economy and significantly a new regionalism. The archaeology of Europe shows that there were winners and losers in these fast‐changing regions. The losers, in many cases, controlled the written narratives and ascribed their altered socio‐economic condition to the Others of the time, not least because the Others were leading exponents of the post‐correctio economic agenda. This paper revisits Klavs Randsborg's groundbreaking book, The Viking Age of Denmark, in the context of post‐war approaches to Europe's post‐classical narrative.  相似文献   
109.
110.
The Iron Age settlements of northern Cameroon were dispersed across the landscape, taking advantage of different eco-climatic zones to exploit a variety of natural resources. Situated at the interface of the upper and lower terraces of the Benue River, mound sites in the area around Garoua have occupation histories spanning multiple centuries. The site of Langui-Tchéboua displays evidence for rapid accumulation of sediments approximately 700 years ago, which may have been a deliberate construction strategy that would have allowed the site’s inhabitants to exploit resources in both floodplain and dryland contexts. The combined use of multiple dating methods and micromorphology provide novel insights into both the mechanisms of anthropogenic landscape change and possible motivations governing those choices.  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