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   205篇
  免费   11篇
  2023年   1篇
  2020年   3篇
  2019年   5篇
  2018年   7篇
  2017年   11篇
  2016年   8篇
  2015年   10篇
  2014年   5篇
  2013年   75篇
  2012年   3篇
  2011年   9篇
  2009年   4篇
  2008年   3篇
  2007年   5篇
  2006年   5篇
  2005年   4篇
  2004年   3篇
  2003年   9篇
  2002年   7篇
  2001年   3篇
  2000年   1篇
  1999年   2篇
  1994年   1篇
  1993年   1篇
  1992年   1篇
  1991年   1篇
  1988年   2篇
  1986年   1篇
  1985年   2篇
  1984年   1篇
  1983年   1篇
  1982年   1篇
  1980年   1篇
  1978年   2篇
  1977年   1篇
  1976年   1篇
  1975年   1篇
  1974年   2篇
  1973年   2篇
  1971年   2篇
  1970年   1篇
  1969年   2篇
  1963年   1篇
  1960年   1篇
  1950年   2篇
  1948年   2篇
排序方式: 共有216条查询结果,搜索用时 125 毫秒
61.
In the closing decades of the nineteenth century the idea of Greater Britain, of the unity of the Anglo-Saxon colonies and the ‘mother country’, became a topic of considerable interest and controversy amongst the metropolitan intellectual and political elite. This article examines the roles played by the monarchy in the debates. Queen Victoria, as both idea and institution, assumed two central functions. First, it was argued that the institution of the monarchy, stretching back over centuries, could supply an anchor of permanence and constitutional fidelity in a redesigned global polity. This would reassure critics of such schemes that their fears about fundamental transformation were unfounded; that a thread of historical continuity ran through the proposals. Secondly, Victoria – or at least an idealised representation of her – acted as the linchpin for a sense of global national identity. The prestige and admiration that she (and the institution of the monarchy itself) generated, it was contended, bound the distant peoples of her realm in close communion. Moreover, the way in which she was sometimes represented in imperial debate harked back to (while modifying) an older civic humanist language of ‘patriot kingship’.  相似文献   
62.
This paper provides the first systematic assessment of blanket mire degradation in the east Cheviot Hills, Northumberland. The extent of erosion is mapped over a 32 km2 area of peat. Erosion affects 37% of the blanket peat. Erosion forms consist of anastomosing (7%), linear (21%) and dendritic (9%) gully systems together with peat slides (<1%). Topography is the primary influence on gully system pattern. Spatial variations in gully form can be partly explained by position in the stream network (stream order) and local variations in the depth of peat. A sequential scheme of gully development is described. Gullies evolve initially through a phase of rapid downcutting to the peat base, followed by lateral erosion and gully widening becoming dominant through a process of roughly parallel wall retreat. As gully width increases re‐deposition of peat occurs and re‐vegetation occurs on the gully floor. Comparative photography reveals that gully patterns have been stable over the past 32 years and in some areas for over 70 years. It is possible that gully systems in places are in excess of 500 years old.  相似文献   
63.
Increasingly, local cultural communities are called upon to support global mega‐events such as the Olympic games with the promise that this global occurrence is a ‘once in a lifetime opportunity’ for an urban artistic community. What evidence exists to support the premise that hosting a Cultural Olympiad provides a professional arts sector with positive and substantive legacies, sustained material and financial benefits, or increased national and international profile? Data collected on the Vancouver 2010 Cultural Olympiad suggest that the local arts sector did not enjoy any of the claimed global benefits. However, it is also clear that some arts organizations, by virtue of the artistic and operational decisions they took, were able to exert influence over and upon the outcome; this outcome ultimately depending on whether they elected to play for a global or a local stage.  相似文献   
64.
65.
Chicago: WBEZ and Public Radio International, 2004. 22 minutes(DVD) with 96 pp. hard cover (book). To go on sale Fall 2005(price not yet disclosed; currently available with $150 donationto Chicago Public Radio). http://www.thislife.org/dvd/  相似文献   
66.
Urban evolution in the USA   总被引:17,自引:0,他引:17  
On a sustained basis, cities are of non-uniform relative sizes.This paper addresses three basic issues which arise from thissimple observation by examining the size distribution of UScities over the period 1900–1990. First, we explore thereasons why there is a wide distribution of city sizes. Second,we characterize the evolution of the size distribution of cities,documenting growth in sizes and numbers of cities. We ask whetherthe relative size distribution of cities has remained stableover time, or if it has displayed, instead, a tendency to collapse,flatten, or otherwise change its shape. We also examine evidenceon whether the size distribution obeys Zipf's Law. Third, weexamine the degree and determinants of mobility of individualcities within this distribution, asking to what extent citiesare moving up and down in the distribution and how this movementis influenced by cities' geographic characteristics. We usea newly constructed data with consistent metropolitan area definitionsover this century, discussing the issues and linking our resultsto the relevant literature.  相似文献   
67.
68.
69.
70.
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