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   19808篇
  免费   207篇
  国内免费   23篇
财政金融   3062篇
工业经济   873篇
计划管理   3224篇
经济学   4810篇
综合类   499篇
运输经济   100篇
旅游经济   97篇
贸易经济   5148篇
农业经济   99篇
经济概况   1508篇
信息产业经济   44篇
邮电经济   574篇
  2023年   66篇
  2022年   54篇
  2021年   71篇
  2020年   143篇
  2019年   164篇
  2018年   2471篇
  2017年   2290篇
  2016年   1403篇
  2015年   222篇
  2014年   260篇
  2013年   759篇
  2012年   632篇
  2011年   2067篇
  2010年   1953篇
  2009年   1640篇
  2008年   1589篇
  2007年   1930篇
  2006年   135篇
  2005年   456篇
  2004年   516篇
  2003年   587篇
  2002年   290篇
  2001年   103篇
  2000年   78篇
  1999年   30篇
  1998年   24篇
  1997年   17篇
  1996年   21篇
  1995年   11篇
  1994年   12篇
  1993年   6篇
  1992年   3篇
  1991年   3篇
  1990年   1篇
  1986年   13篇
  1985年   3篇
  1984年   3篇
  1983年   2篇
  1981年   1篇
  1979年   2篇
  1977年   1篇
  1976年   3篇
  1975年   1篇
  1973年   1篇
  1890年   1篇
排序方式: 共有10000条查询结果,搜索用时 343 毫秒
11.
Without guaranteed compensation, granted by the German Renewable Energy Sources Act (Erneuerbare Energien Gesetz/EEG), biogas plants compete with all other plant types on the market for electrical energy. However, exchange-based electricity products do not currently permit an economically viable operation of biogas plants owing to their cost situation.  相似文献   
12.
13.
Do local partners' network attributes affect the survival of high-tech international joint ventures (IJV)? How does the effect of network attributes vary in different subnational institutional environments? While the classic economic explanation for IJV formation and subsequent performance draws from the resource-based view (RBV), we add the relational dimension to explain that IJV survival may be affected by local partners’ relation-specific assets within the local network. We test the effect of the local partners’ network attributes as calculated by UCINET (centrality, network status, and structural hole position) on IJV survival. We additionally assert that this relationship is moderated by subnational institutional heterogeneity. Using our sample of 125 IJV dyadic pairs of US multinational enterprises (MNEs) operating in high-tech industries and their local partners in China, we find partial support for our claims.  相似文献   
14.
We explore the innovation performance benefits of alliances for spin-off firms, in particular spin-offs either from other firms or from public research organizations. During the early years of the emerging combinatorial chemistry industry, the industry on which our empirical analysis focuses, spin-offs engaged in alliances with large and established partners, partners of similar type and size, and with public research organizations, often for different reasons. We seek to understand to what extent alliances of spin-offs with other firms (either large- or small- and medium-sized firms) affected their innovation performance and also how this performance may have been affected by their corporate or public research background. We find evidence that in general alliances of spin-offs with other firms, in particular alliances with large firms, increased their innovation performance. Corporate spin-offs that formed alliances with other firms outperformed public research spin-offs with such alliances. This suggests that, in terms of their innovation performance, corporate spin-offs that engaged in alliances with other firms seemed to have benefitted from their prior corporate background. Interestingly, it turns out that the negative impact of alliances on the innovation performance of public research spin-offs was largely affected by their alliances with small- and medium-sized firms.  相似文献   
15.
16.
Studies on dynamic managerial capabilities still have a rather theoretical nature, and there is great difficulty in finding a valid, reliable instrument to measure this construct. The present study contributes to solving this problem: It aims to develop and validate a scale to measure dynamic managerial capabilities. In this investigation, we develop a scale for three factors related to dynamic managerial capabilities: human capital, managerial cognition (already described in the literature), and relationship networks. The prominent finding in this research is the factor that is referred to here as relationship networks.  相似文献   
17.
18.
19.
We investigate the roots of scientists' perceptions of the impact of their work by examining stable psychological characteristics such as personality traits. An analysis of personality traits highlights the effects of policies related to gender equality, allocation of research time and skills acquisition. It improves our understanding of the conflicts related to scientists’ perceptions of the impact of their research on beneficiaries. For example, conscientiousness increases the perceived impact on clinical beneficiaries, but reduces the perceived impact on industrial beneficiaries. Organizational scientific freedom increases the effects of personality traits on perceived impact on beneficiaries such that scientists affiliated to a university are less likely than colleagues working in other research settings to perceive the simultaneous impact of their work on both industrial and clinical beneficiaries.  相似文献   
20.
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