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   232篇
  免费   4篇
财政金融   57篇
工业经济   23篇
计划管理   36篇
经济学   38篇
综合类   2篇
贸易经济   53篇
农业经济   3篇
经济概况   24篇
  2021年   2篇
  2020年   4篇
  2019年   2篇
  2018年   5篇
  2017年   7篇
  2016年   5篇
  2015年   4篇
  2014年   7篇
  2013年   17篇
  2012年   8篇
  2011年   6篇
  2010年   3篇
  2009年   11篇
  2008年   10篇
  2007年   7篇
  2006年   2篇
  2005年   6篇
  2004年   9篇
  2003年   5篇
  2002年   5篇
  2001年   6篇
  2000年   4篇
  1999年   2篇
  1998年   4篇
  1997年   2篇
  1996年   3篇
  1995年   3篇
  1994年   7篇
  1993年   4篇
  1992年   6篇
  1991年   3篇
  1990年   3篇
  1989年   2篇
  1987年   4篇
  1986年   4篇
  1985年   3篇
  1984年   5篇
  1983年   6篇
  1981年   3篇
  1980年   4篇
  1979年   4篇
  1978年   2篇
  1975年   2篇
  1973年   2篇
  1972年   2篇
  1971年   4篇
  1967年   2篇
  1930年   1篇
  1929年   1篇
  1928年   2篇
排序方式: 共有236条查询结果,搜索用时 15 毫秒
51.
This paper examines the impact of tax incentives on corporate research and development (R&D) activity. R&D tax incentives are commonly provided as special tax allowances or tax credits. In recent years, several countries also reduced their income tax rates on R&D output with the purpose to foster R&D activity. Previous papers have shown that all three tax instruments are effective in raising the quantity of R&D related activity. We in turn assess the impact of corporate tax incentives on the quality of R&D projects, i.e., their innovativeness and earnings potential. Using rich data on corporate patent applications to the European patent office, we find that a low tax rate on patent income raises the average profitability and innovation level of the projects undertaken in a country. The effect is statistically significant and economically relevant and prevails in a number of sensitivity checks. Generous R&D tax credits and tax allowances are in contrast found to exert a negative impact on project quality.  相似文献   
52.
53.
Public fears have grown up surrounding the uncertain potential benefit or harm of recent rapid technological advances in Austrian telecommunications. A technology assessment was called for, to proffer comprehensive and balanced information on the current state of, and future developments in, Austrian telecommunications. This paper explains the organization of the Austrian PTT, discusses successful new services, considers their relationship to the law and the economy, and analyses their social impact.  相似文献   
54.
Between 1997 and 2004, Preussag, a diversified German conglomerate of "old economy" businesses, transformed itself into TUI, a company focused almost entirely on tourism and logistics. We analyze how Preussag executed this change, and how the change contributed to Preussag's underperformance in the stock market. We find that only the divestitures created value, that the strategy to invest in tourism destroyed value, and that the acquisition premiums Preussag paid were mostly unjustified. The case shows how divestiture programs increase the liquid resources available to management and casts doubt on the positive governance role of institutional blockholders.  相似文献   
55.
Drawing from the resource-based view and transaction costs economics, we develop a theoretical framework to explain why small and large firms face different levels of resource access needs and resource access capabilities, which mediate the relationship between firm size and hybrid governance. Employing a sample of 317 venture capital firms, drawn across six European countries, we empirically assess our framework in the context of venture capital syndication. We estimate a path model using structural equation modeling and find, consistent with our theoretical framework, mediating effects of different types of resource access needs and resource access capabilities between VC firm size and syndication frequency. These findings advance the small business literature by highlighting the trade-offs that size imposes on firms that seek to manage their access to external resources through hybrid governance strategies.  相似文献   
56.
57.
Dynamic processes are crucial in many empirical fields, such as in oceanography, climate science, and engineering. Processes that evolve through time are often well described by systems of ordinary differential equations (ODEs). Fitting ODEs to data has long been a bottleneck because the analytical solution of general systems of ODEs is often not explicitly available. We focus on a class of inference techniques that uses smoothing to avoid direct integration. In particular, we develop a Bayesian smooth-and-match strategy that approximates the ODE solution while performing Bayesian inference on the model parameters. We incorporate in the strategy two main sources of uncertainty: the noise level of the measured observations and the model approximation error. We assess the performance of the proposed approach in an extensive simulation study and on a canonical data set of neuronal electrical activity.  相似文献   
58.
Phylogenetic trees are types of networks that describe the temporal relationship between individuals, species, or other units that are subject to evolutionary diversification. Many phylogenetic trees are constructed from molecular data that is often only available for extant species, and hence they lack all or some of the branches that did not make it into the present. This feature makes inference on the diversification process challenging. For relatively simple diversification models, analytical or numerical methods to compute the likelihood exist, but these do not work for more realistic models in which the likelihood depends on properties of the missing lineages. In this article, we study a general class of species diversification models, and we provide an expectation-maximization framework in combination with a uniform sampling scheme to perform maximum likelihood estimation of the parameters of the diversification process.  相似文献   
59.
60.
The paper concerns how new quality management in the Danish hospital sector has created new career and professionalisation opportunities for nurses. While the well-known dualism between the logics of professionalism and managerialism is challenged in the literature, not much is known about how engagement in the tighter steering of practice may converge with professional identities and meaningfulness in work. The paper applies a Bourdieusian and ethnographic approach to the examination of nurses’ enthusiastic involvement in quality management as they take up hybrid managerial positions in an acute care department. The findings demonstrate the importance of the material and symbolic value of scientific-bureaucratic knowledge in legitimizing quality management, achieving meaningfulness in practice and bolstering the professional role of nurses.  相似文献   
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