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   147969篇
  免费   4359篇
  国内免费   25篇
财政金融   25286篇
工业经济   11501篇
计划管理   21351篇
经济学   28470篇
综合类   1431篇
运输经济   950篇
旅游经济   2480篇
贸易经济   23173篇
农业经济   6051篇
经济概况   16774篇
水利工程   14643篇
信息产业经济   8篇
邮电经济   235篇
  2021年   1052篇
  2020年   1785篇
  2019年   2606篇
  2018年   2596篇
  2017年   2645篇
  2016年   3016篇
  2015年   2351篇
  2014年   3769篇
  2013年   16235篇
  2012年   4667篇
  2011年   4373篇
  2010年   3921篇
  2009年   4592篇
  2008年   4100篇
  2007年   3474篇
  2006年   3918篇
  2005年   3795篇
  2004年   3415篇
  2003年   3035篇
  2002年   3055篇
  2001年   2875篇
  2000年   2709篇
  1999年   2639篇
  1998年   2472篇
  1997年   2564篇
  1996年   2419篇
  1995年   2204篇
  1994年   2214篇
  1993年   2203篇
  1992年   2278篇
  1991年   2109篇
  1990年   1992篇
  1989年   1891篇
  1988年   1802篇
  1987年   1806篇
  1986年   1806篇
  1985年   2590篇
  1984年   2481篇
  1983年   2290篇
  1982年   2156篇
  1981年   2109篇
  1980年   2113篇
  1979年   2023篇
  1978年   1861篇
  1977年   1818篇
  1976年   1629篇
  1975年   1471篇
  1974年   1395篇
  1973年   1400篇
  1972年   1099篇
排序方式: 共有10000条查询结果,搜索用时 718 毫秒
981.
982.
983.
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   
984.
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   
985.
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   
986.
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   
987.
988.
989.
990.
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