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   21283篇
  免费   339篇
  国内免费   1篇
财政金融   3300篇
工业经济   947篇
计划管理   3436篇
经济学   5105篇
综合类   505篇
运输经济   72篇
旅游经济   62篇
贸易经济   5704篇
农业经济   136篇
经济概况   1713篇
信息产业经济   44篇
邮电经济   599篇
  2024年   10篇
  2023年   99篇
  2022年   66篇
  2021年   93篇
  2020年   146篇
  2019年   164篇
  2018年   2517篇
  2017年   2332篇
  2016年   1511篇
  2015年   297篇
  2014年   351篇
  2013年   1015篇
  2012年   693篇
  2011年   2082篇
  2010年   2019篇
  2009年   1685篇
  2008年   1641篇
  2007年   1926篇
  2006年   172篇
  2005年   483篇
  2004年   510篇
  2003年   623篇
  2002年   297篇
  2001年   113篇
  2000年   94篇
  1999年   32篇
  1998年   57篇
  1997年   27篇
  1996年   46篇
  1995年   28篇
  1994年   26篇
  1993年   25篇
  1992年   22篇
  1991年   23篇
  1990年   14篇
  1989年   20篇
  1988年   10篇
  1987年   11篇
  1986年   25篇
  1985年   30篇
  1984年   36篇
  1983年   20篇
  1982年   23篇
  1981年   23篇
  1980年   14篇
  1977年   14篇
  1976年   11篇
  1975年   13篇
  1974年   14篇
  1973年   9篇
排序方式: 共有10000条查询结果,搜索用时 78 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.
While many studies on the Fourth Industrial Revolution (FIR) focus on efficiency, productivity and economic progress, only a few have considered its ethical aspects. This article tries to contribute to filling this vacuum by providing a comprehensive approach to ethical risks at the workplace. Drawing upon Catholic social teaching (CST)—addressed to all people of good will—it analyzes ethical aspects at the workplace posited by the FIR, and more particularly by Industry 4.0, which is at the core of this revolution. CST emphasizes the dignity of the worker and the necessity to flourish at the workplace. While robots, artificial intelligence, and interconnected technologies are only instrumental, the real subject of work is the worker. This casts specific light on the ethical issues analyzed, including effects on employment, wages and inequality, human quality treatment, relational aspects, safety and health, surveillance on employees, and meaningful work.  相似文献   
16.
17.
18.
Journal of Economic Interaction and Coordination - This paper explores a situation in which a population split into two groups attempts to achieve the socially efficient outcome of a coordination...  相似文献   
19.
We propose parametric copulas that capture serial dependence in stationary heteroskedastic time series. We suggest copulas for first‐order Markov series, and then extend them to higher orders and multivariate series. We derive the copula of a volatility proxy, based on which we propose new measures of volatility dependence, including co‐movement and spillover in multivariate series. In general, these depend upon the marginal distributions of the series. Using exchange rate returns, we show that the resulting copula models can capture their marginal distributions more accurately than univariate and multivariate generalized autoregressive conditional heteroskedasticity models, and produce more accurate value‐at‐risk forecasts.  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