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   10956篇
  免费   113篇
各国政治   429篇
工人农民   1149篇
世界政治   461篇
外交国际关系   470篇
法律   5686篇
中国政治   13篇
政治理论   2785篇
综合类   76篇
  2023年   10篇
  2022年   10篇
  2021年   23篇
  2020年   46篇
  2019年   55篇
  2018年   1346篇
  2017年   1264篇
  2016年   1103篇
  2015年   115篇
  2014年   87篇
  2013年   460篇
  2012年   278篇
  2011年   993篇
  2010年   1066篇
  2009年   647篇
  2008年   818篇
  2007年   790篇
  2006年   78篇
  2005年   162篇
  2004年   260篇
  2003年   210篇
  2002年   108篇
  2001年   75篇
  2000年   78篇
  1999年   58篇
  1998年   58篇
  1997年   57篇
  1996年   70篇
  1995年   72篇
  1994年   63篇
  1993年   36篇
  1992年   43篇
  1991年   47篇
  1990年   45篇
  1989年   41篇
  1988年   34篇
  1987年   19篇
  1986年   24篇
  1985年   25篇
  1984年   33篇
  1983年   30篇
  1982年   35篇
  1981年   38篇
  1980年   28篇
  1979年   18篇
  1978年   21篇
  1977年   20篇
  1975年   12篇
  1974年   12篇
  1967年   7篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
771.
772.
Climate change is emerging as one of the primary geopolitical challenges of the early twenty-first century, one that will likely involve military engagements and deployments in both traditional and non-traditional missions. Unlike mass casualty terrorism, climate change does not have a single galvanising event that can encourage collective mitigation efforts by both developed and developing states. International efforts to counter putative climate change causes have, thus far, been only marginally successful. Consequently, some of the more pernicious effects of climate change—extreme weather, heat waves, droughts and floods—will likely continue to manifest in the years and decades ahead. From a geopolitical perspective, climate change may influence the trajectory of rising or declining states in an increasingly multipolar world. It may also induce or exacerbate resource competition between states, particularly with regard to energy resources, water and food. Climate change may also exert a general weakening effect on lesser developed countries, thus necessitating increasingly intrusive and costly humanitarian assistance and disaster response (HADR) missions, some of which may be conducted by military agencies. Overall, these trends suggest that climate change will continue to emerge as a significant factor that shapes and defines future military missions and deployments.  相似文献   
773.
774.
775.
776.
This paper examines race-based peremptory challenges. Such challenges occur during the voir dire jury selection process. The process allows both the defense and the prosecution to strike jurors who they believe will not decide cases fairly. However, in the case of Batson v. Kentucky 476 U.S. 79 (1986), the Supreme Court ruled that race could not be used as a factor in eliminating prospective jurors. This paper examines federal litigation for five years in which it was alleged that race was used as a factor in removing a juror. An examination of the cases revealed that most of the cases involved sole male litigants who allege that there were multiple race-based peremptory challenges used in their cases. Moreover, most of the cases that led to the allegations involved violent offenses. Other case characteristics are noted, but of most significance was the finding that most appellants lost their cases. As such, the courts felt that most of the challenges were, in fact, race neutral. The implications of this research are discussed. This study was funded by an undergraduate research grant from Penn State University.  相似文献   
777.
778.
Developing the “Science of Science Policy” will require data collection and analysis related to the processes of innovation and technological change, and the effects of government policy on those processes. There has been much work on these topics in the last three decades, but there remain difficult problems of finding proxies for subtle concepts, endogeneity, distinguishing private and social returns, untangling cumulative effects, measuring the impact of government programs in a true “but for” sense, and sorting out national and global effects. I offer observations on how to think about these issues. This paper was presented as the Keynote Address at the NSF Workshop on Advancing Measures of Innovation: Knowledge Flows, Business Metrics, and Measurement Strategies, Arlington, VA, June 2006.  相似文献   
779.
780.
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