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   523篇
  免费   17篇
各国政治   24篇
工人农民   21篇
世界政治   45篇
外交国际关系   24篇
法律   227篇
中国政治   3篇
政治理论   191篇
综合类   5篇
  2023年   2篇
  2020年   6篇
  2019年   11篇
  2018年   9篇
  2017年   13篇
  2016年   3篇
  2015年   12篇
  2014年   15篇
  2013年   78篇
  2012年   15篇
  2011年   8篇
  2010年   13篇
  2009年   14篇
  2008年   22篇
  2007年   14篇
  2006年   17篇
  2005年   22篇
  2004年   28篇
  2003年   20篇
  2002年   21篇
  2001年   15篇
  2000年   6篇
  1999年   8篇
  1998年   7篇
  1997年   15篇
  1996年   3篇
  1995年   6篇
  1994年   7篇
  1993年   9篇
  1992年   3篇
  1991年   9篇
  1990年   8篇
  1989年   10篇
  1988年   12篇
  1987年   8篇
  1986年   8篇
  1985年   10篇
  1984年   8篇
  1983年   5篇
  1982年   8篇
  1981年   6篇
  1978年   4篇
  1977年   2篇
  1976年   4篇
  1975年   5篇
  1973年   3篇
  1970年   1篇
  1969年   1篇
  1968年   1篇
  1966年   1篇
排序方式: 共有540条查询结果,搜索用时 15 毫秒
71.
72.
73.
74.
Reviews     
  相似文献   
75.
76.
This paper examines the role that basic research plays in the strategies pursued by industry in their interactions with federal labs. It draws on questionnaire-based data of 229 federal laboratory-industry joint R&D projects with 219 companies and 27 laboratories. The study documents the relative importance of basic research in the success of the interactions by comparing the incidence of basic research on several indicators of success. The study shows that, even though projects involving basic research tend to have higher costs, they also have a high percentage of product outputs in the short term. Typical high payoff strategies for partnership were those in which the company performed several technical roles and the federal laboratory was more narrowly focused. The authors gratefully acknowledge the support of the National Science Foundation, Research on Science and Technology Program, Contract No. 9220125. The views expressed here are the authors' and do not necessarily reflect those of the National Science Foundation or any other institution.  相似文献   
77.
HOLDING: Before withdrawal of tube feeding may be permitted, a guardian must establish, by clear and convincing evidence, the treating and consulting physicians' education, training, and experience; the physician's history and experience with the patient; the fact that the physician personally examined the patient; and the opinions required by statute. Each physician should also testify to his opinion that the other physician in the matter is qualified, by reason of advanced education or training, limited practice, experience, or certification as a specialist, to make the findings and provide the opinions about the patient which are required by the statute. The consulting physician's opinion should be more than a conclusory adoption of the attending physician's opinion. Rather, it should be independently stated and, ideally, should include the reasons upon which it is based.  相似文献   
78.
A diverse and growing literature ties legislative professionalization and power to career paths. In particular, higher rates of reelection and longer legislative careers should produce more professional, competent, and high‐quality legislatures. Legislators have more incentives to strengthen their own institution when they intend to remain there for a long career. Using data from the most recent constitutional convention in Brazil, we show that legislators with greater prospects for long careers were actually less likely to support strengthening the legislative branch. We explain this as part of a local equilibrium where career legislators’ short‐term need for pork trumped their long‐term interest in a stronger institution.  相似文献   
79.
Fourier-transform infrared spectroscopy (FTIR), discriminate analysis, X-ray fluorescence spectrometry (XRF), and stereoscopic microscopy were used to separate black coral forensic evidence items from similarly appearing items manufactured from plastics, bovid keratin, and mangrove wood. In addition, novel observations were made of bromine and iodine relationships in black coral that have not been previously reported.  相似文献   
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