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   150125篇
  免费   4372篇
  国内免费   26篇
财政金融   25792篇
工业经济   11534篇
计划管理   21735篇
经济学   29073篇
综合类   1455篇
运输经济   958篇
旅游经济   2482篇
贸易经济   23422篇
农业经济   6082篇
经济概况   16838篇
水利工程   14869篇
信息产业经济   7篇
邮电经济   276篇
  2021年   1064篇
  2020年   1796篇
  2019年   2624篇
  2018年   2627篇
  2017年   2699篇
  2016年   3037篇
  2015年   2372篇
  2014年   3785篇
  2013年   16284篇
  2012年   4710篇
  2011年   4481篇
  2010年   3969篇
  2009年   4626篇
  2008年   4164篇
  2007年   3585篇
  2006年   3940篇
  2005年   3867篇
  2004年   3478篇
  2003年   3085篇
  2002年   3086篇
  2001年   2943篇
  2000年   2793篇
  1999年   2687篇
  1998年   2537篇
  1997年   2637篇
  1996年   2464篇
  1995年   2249篇
  1994年   2269篇
  1993年   2238篇
  1992年   2330篇
  1991年   2198篇
  1990年   2030篇
  1989年   1903篇
  1988年   1805篇
  1987年   1827篇
  1986年   1844篇
  1985年   2633篇
  1984年   2537篇
  1983年   2334篇
  1982年   2222篇
  1981年   2158篇
  1980年   2155篇
  1979年   2096篇
  1978年   1901篇
  1977年   1832篇
  1976年   1647篇
  1975年   1499篇
  1974年   1399篇
  1973年   1403篇
  1972年   1100篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
941.
942.
943.
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   
944.
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   
945.
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   
946.
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   
947.
948.
949.
950.
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