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   137758篇
  免费   3857篇
  国内免费   2篇
财政金融   25975篇
工业经济   11697篇
计划管理   21967篇
经济学   29555篇
综合类   1474篇
运输经济   981篇
旅游经济   2544篇
贸易经济   23746篇
农业经济   6170篇
经济概况   17259篇
信息产业经济   9篇
邮电经济   240篇
  2021年   839篇
  2020年   1635篇
  2019年   2416篇
  2018年   2405篇
  2017年   2579篇
  2016年   2749篇
  2015年   2096篇
  2014年   3420篇
  2013年   15381篇
  2012年   4248篇
  2011年   4281篇
  2010年   3789篇
  2009年   4389篇
  2008年   3995篇
  2007年   3320篇
  2006年   3620篇
  2005年   3595篇
  2004年   3167篇
  2003年   2935篇
  2002年   2904篇
  2001年   2661篇
  2000年   2611篇
  1999年   2500篇
  1998年   2321篇
  1997年   2389篇
  1996年   2255篇
  1995年   2049篇
  1994年   2048篇
  1993年   2033篇
  1992年   2085篇
  1991年   1980篇
  1990年   1854篇
  1989年   1689篇
  1988年   1632篇
  1987年   1632篇
  1986年   1724篇
  1985年   2490篇
  1984年   2345篇
  1983年   2151篇
  1982年   2005篇
  1981年   1936篇
  1980年   1924篇
  1979年   1840篇
  1978年   1661篇
  1977年   1639篇
  1976年   1389篇
  1975年   1287篇
  1974年   1192篇
  1973年   1187篇
  1972年   897篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
841.
842.
843.
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   
844.
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   
845.
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   
846.
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   
847.
848.
849.
850.
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