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   221篇
  免费   7篇
  2023年   1篇
  2020年   4篇
  2019年   5篇
  2018年   4篇
  2017年   14篇
  2016年   6篇
  2015年   5篇
  2014年   4篇
  2013年   70篇
  2012年   6篇
  2011年   6篇
  2010年   7篇
  2009年   3篇
  2008年   4篇
  2007年   4篇
  2006年   3篇
  2005年   1篇
  2004年   4篇
  2003年   4篇
  2002年   6篇
  2001年   4篇
  2000年   6篇
  1999年   3篇
  1998年   3篇
  1997年   3篇
  1996年   3篇
  1995年   3篇
  1994年   6篇
  1993年   1篇
  1992年   4篇
  1991年   1篇
  1990年   1篇
  1989年   2篇
  1988年   3篇
  1987年   1篇
  1986年   1篇
  1985年   4篇
  1984年   1篇
  1983年   3篇
  1982年   1篇
  1981年   2篇
  1979年   5篇
  1977年   1篇
  1976年   1篇
  1975年   1篇
  1974年   1篇
  1970年   2篇
排序方式: 共有228条查询结果,搜索用时 46 毫秒
71.
72.
73.
Scholars agree that postreform House majority leadership strategies distinguish contemporary leaders from their predecessors. One such strategy is leaders' use of media to fulfill personal and member goals. Commonly presented evidence of this strategy is the increase in the number of times leaders appear in national evening newscasts. Yet most studies do not investigate the kind of media coverage leaders receive over time. Hence they do not show whether leaders have been successful in generating the sort of television attention consistent with the incentives that the literature identifies as driving them to adopt a media-oriented strategy. This article begins to address this gap in our understanding. Conducting a content analysis of network news accounts, we find that while postreform leaders have received more attention than their predecessors, coverage of them declined and leveled off in the 1990s. We also find that despite the drop in levels of attention accorded House majority-party leaders, they have maintained a plateau of higher news visibility relative to their primary competitors in the House, committee chairs, though there have been some recent exceptions to this trend that are highly suggestive.  相似文献   
74.
A simple typology of relations between any two geographical scales is established by qualitatively comparing their respective grains and extents. This typology is applied to spatial, temporal, and spatiotemporal scales. It describes seven relations between any two scales in either space or time. These basic relations yield a set of 169 qualitatively different spatiotemporal scale relations, a subset of which is portrayed dia‐grammatically. If it is possible to transform processes or patterns from one scale in the relation to the other, up to four scaling methods may need to be simultaneously applied, depending on the relation. Scaling methods might be classified as forms of grain generalization, grain decomposition, extent extrapolation, or extent selection. This typology may also provide a framework for investigations of dependencies between scales, as well as a reference scheme for observations of scale nonstationarity. The possibility is offered that any relation that forms a nonintersecting hierarchy in either space or time is a relation between essentially independent scales. However, the use of this typology is contingent on a number of factors, and it is offered as a tool, rather than a solution, for problems of scale.  相似文献   
75.
76.
77.
Municipal solid waste management and planning traditionally have been regarded as the responsibility of local government. However, the legal climate surrounding solid waste management has become more constrained, placing local government at the mercy of the private waste management industry, and eroding the effectiveness of local waste planning efforts. This article provides an overview of recent court decisions impacting local government solid waste management. It also discusses current congressional activity relating to interstate waste transport and flow control, and assesses the potential effects of such legislation on public solid waste management and on privatization issues raised by critics of local control.  相似文献   
78.
79.
80.
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