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   149629篇
  免费   4385篇
  国内免费   27篇
财政金融   25485篇
工业经济   11623篇
计划管理   21716篇
经济学   28939篇
综合类   1460篇
运输经济   976篇
旅游经济   2480篇
贸易经济   23430篇
农业经济   6105篇
经济概况   16883篇
水利工程   14692篇
信息产业经济   7篇
邮电经济   245篇
  2021年   1065篇
  2020年   1808篇
  2019年   2636篇
  2018年   2629篇
  2017年   2721篇
  2016年   3048篇
  2015年   2361篇
  2014年   3788篇
  2013年   16331篇
  2012年   4701篇
  2011年   4468篇
  2010年   4002篇
  2009年   4665篇
  2008年   4176篇
  2007年   3619篇
  2006年   3941篇
  2005年   3825篇
  2004年   3441篇
  2003年   3082篇
  2002年   3102篇
  2001年   2901篇
  2000年   2744篇
  1999年   2668篇
  1998年   2499篇
  1997年   2585篇
  1996年   2426篇
  1995年   2224篇
  1994年   2239篇
  1993年   2210篇
  1992年   2297篇
  1991年   2146篇
  1990年   2015篇
  1989年   1895篇
  1988年   1802篇
  1987年   1810篇
  1986年   1833篇
  1985年   2621篇
  1984年   2519篇
  1983年   2329篇
  1982年   2200篇
  1981年   2129篇
  1980年   2159篇
  1979年   2078篇
  1978年   1872篇
  1977年   1824篇
  1976年   1633篇
  1975年   1479篇
  1974年   1401篇
  1973年   1404篇
  1972年   1103篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
991.
992.
993.
The Dynamics of Alliance Conditions in the Alliance Development Process   总被引:10,自引:0,他引:10  
One of the key issues in understanding the developmental processes of strategic alliances is how the alliance conditions change over the different stages of alliance development. A related question concerns the nature of the co-evolutionary dynamics of alliances in terms of their constituent partner firms. In this article we propose an integrated process model of alliances that is based on alliance conditions, allianc developmental stages, and an alliance system comprising co-evolutionary elements. We suggest that alliance conditions, or the key characteristics of an alliance at any given moment, link the alliance environment (firm characteristics) and the alliance development process. We also explore how specific patterns of alliance conditions have differential impacts on the interactive elements of the alliance co-evolutionary system.  相似文献   
994.
Sufficient conditions are found for designs, derived from completely symmetric designs by deleting binary blocks, to be E-optimal. Sufficient conditions are also found for E-optimality of designs obtained from other E-optimal designs by deleting all blocks forming a balanced incomplete block design on a subset of the treatments. The results include many binary and non-binary designs for which E-optimality was previously unknown.  相似文献   
995.
Tracking programs have been criticized on the grounds that they harm disadvantaged children. The bulk of empirical research supports this view, but existing studies compare outcomes across students placed in different tracks. Track placement is likely to be endogenous with respect to student outcomes. We use a new strategy for overcoming the endogeneity of track placement and find no evidence that tracking hurts low-ability children. Previous studies have also been based on the assumption that students' enrollment decisions are unrelated to whether or not the school tracks. When we account for the possibility that tracking programs affect school choice, we find evidence that they may help low-ability children.  相似文献   
996.
The assessment of public universities has gained importance because of the demands from such state government bodies as the executive and the legislature. Public universities are increasingly being asked to account for how efficiently they have used diminishing state financial resources. Administrators thus have the responsibility of ensuring that the university's financial, human, and physical resources are allocated to academic departments in a manner that enhances the institution's efficiency. In this paper, data envelopment analysis (DEA) is proposed for evaluating the efficiency of academic departments at a public university. DEA provides a single measure of efficiency for each academic unit. It also identifies the causes behind the inefficiencies exhibited by poor performing units, as well as the changes that these units need to make in order to improve their efficiencies. Its usefulness as a planning tool is also discussed. Copyright © 2002 John Wiley & Sons, Ltd.  相似文献   
997.
998.
999.
1000.
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