全文获取类型
收费全文 | 28572篇 |
免费 | 307篇 |
国内免费 | 2篇 |
专业分类
财政金融 | 4819篇 |
工业经济 | 1626篇 |
计划管理 | 4687篇 |
经济学 | 6378篇 |
综合类 | 585篇 |
运输经济 | 83篇 |
旅游经济 | 175篇 |
贸易经济 | 6693篇 |
农业经济 | 515篇 |
经济概况 | 2597篇 |
信息产业经济 | 45篇 |
邮电经济 | 678篇 |
出版年
2023年 | 78篇 |
2021年 | 102篇 |
2020年 | 161篇 |
2019年 | 232篇 |
2018年 | 2528篇 |
2017年 | 2304篇 |
2016年 | 1536篇 |
2015年 | 328篇 |
2014年 | 419篇 |
2013年 | 1333篇 |
2012年 | 891篇 |
2011年 | 2322篇 |
2010年 | 2181篇 |
2009年 | 1866篇 |
2008年 | 1856篇 |
2007年 | 2140篇 |
2006年 | 398篇 |
2005年 | 671篇 |
2004年 | 672篇 |
2003年 | 763篇 |
2002年 | 526篇 |
2001年 | 318篇 |
2000年 | 312篇 |
1999年 | 224篇 |
1998年 | 247篇 |
1997年 | 216篇 |
1996年 | 242篇 |
1995年 | 182篇 |
1994年 | 165篇 |
1993年 | 196篇 |
1992年 | 193篇 |
1991年 | 184篇 |
1990年 | 185篇 |
1989年 | 138篇 |
1988年 | 124篇 |
1987年 | 135篇 |
1986年 | 157篇 |
1985年 | 208篇 |
1984年 | 165篇 |
1983年 | 152篇 |
1982年 | 130篇 |
1981年 | 151篇 |
1980年 | 128篇 |
1979年 | 129篇 |
1978年 | 133篇 |
1977年 | 82篇 |
1976年 | 102篇 |
1975年 | 85篇 |
1973年 | 81篇 |
1972年 | 73篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
41.
Characterization and construction of optimal designs using the familiar optimality criteria, for example A-, D- and E-optimality
are well studied in the literature. However the study of the Distance Optimality (DS-) criterion introduced by Sinha (1970)
has very recently drawn attention of researchers. In the present article, we consider the singularly estimable full rank problem
of estimating the full set of elementary treatment contrasts using the DS optimality criterion in the set up of a one way
ANOVA model. Using a limit argument it turns out that a CRD in which difference between any two allocation numbers is at the
most unity is uniquely DS-optimal.
Acknowledgement. We are thankful to Prof. B. K. Sinha for suggesting the problem to us and many helpful discussions with him. We are also
thankful to the referees for drawing our attention to the reference of Bischoff (1995) and many helpful comments. 相似文献
42.
Richard Cebula 《Atlantic Economic Journal》2003,31(3):255-265
Using error-correction model (ECM) estimation, the paper empirically examines the causality relationship between the federal government budget deficit and the ex ante real interest rate yield on high grade long term tax free municipal bonds in the U.S. To clarify this deficit or interest rate relationship, the budget deficit is measured by the primary budget deficit, which excludes net interest payments by the Treasury. In a model that includes federal personal income tax rates and net international capital flows, as well as money supply growth, the ECM estimates strongly suggest a bi-directional relationship between the primary budget deficit and the ex ante real interest rate yield. Budget deficits apparently do matter! William Simon's concerns were justified.The author is indebted to P. A. V. B. Swamy for ideas and helpful suggestions and Will Perry for data assembly and processing. 相似文献
43.
44.
A Product and Process Model of the Technology-Sourcing Decision 总被引:1,自引:0,他引:1
The technology‐sourcing decision traditionally has examined the choice either to innovate internally or to acquire technology from outside sources. The increasing complexity of this decision requires a move beyond the simple “make‐versus‐buy” dichotomy. We seek to test factors that influence the technology decision of subsidiaries for product and process technology across the continuum of options from internal development to outsourcing. We also explore concordance between the research streams of new product development and technology sourcing. Regression models are used to analyze data from 187 subsidiaries that suggest product and process technology development decisions sometimes are associated with similar factors and at other times they diverge. In particular, we find that external product and process technology acquisition decisions are associated negatively with differentiation goals and associated positively with product dynamism. While external product acquisition is associated negatively with a low cost goal and positively with increasing distance between primary marketing and R&D operations, external process technology acquisition is associated positively with high competitive intensity. Implications include the following: (1) While external product technology acquisition may provide quicker or even less expensive initial solutions, external reliance makes it difficult to maintain a long‐term positional advantage; (2) When greater distances separate key functional activities, external partners may provide solutions that are more responsive to local consumer needs, and the potential for improved communication may allow for quicker adaptation and increased flexibility; (3) In highly dynamic product situations, internal development, while providing greater control, can be expensive and can result in technologies that are not accepted by the marketplace; and (4) As competitive intensity increases, strategic imperatives may reduce the focus on product design and development and may require increasing concentration on manufacturing costs and efficiencies. 相似文献
45.
46.
47.
48.
K.S. Larsen 《Futures》2003,35(2):163-167
Relations between rich and poor (across and within countries) appeared in some questions in Images; there were clear differences between what the powerful and the powerless hoped and expected from the future. This is compared with what actually happened and a deeper analysis is made of ‘power’ as an organizing concept. It turned out that the pessimism associated with powerlessness tended to make better predictions. 相似文献
49.
50.