全文获取类型
收费全文 | 31314篇 |
免费 | 679篇 |
国内免费 | 1篇 |
专业分类
财政金融 | 5594篇 |
工业经济 | 2345篇 |
计划管理 | 5401篇 |
经济学 | 7317篇 |
综合类 | 400篇 |
运输经济 | 209篇 |
旅游经济 | 454篇 |
贸易经济 | 5144篇 |
农业经济 | 1466篇 |
经济概况 | 3558篇 |
信息产业经济 | 3篇 |
邮电经济 | 103篇 |
出版年
2021年 | 193篇 |
2020年 | 382篇 |
2019年 | 576篇 |
2018年 | 652篇 |
2017年 | 711篇 |
2016年 | 681篇 |
2015年 | 477篇 |
2014年 | 726篇 |
2013年 | 3185篇 |
2012年 | 1014篇 |
2011年 | 1051篇 |
2010年 | 932篇 |
2009年 | 1057篇 |
2008年 | 962篇 |
2007年 | 854篇 |
2006年 | 793篇 |
2005年 | 690篇 |
2004年 | 623篇 |
2003年 | 647篇 |
2002年 | 554篇 |
2001年 | 680篇 |
2000年 | 644篇 |
1999年 | 568篇 |
1998年 | 622篇 |
1997年 | 599篇 |
1996年 | 576篇 |
1995年 | 528篇 |
1994年 | 514篇 |
1993年 | 503篇 |
1992年 | 544篇 |
1991年 | 546篇 |
1990年 | 478篇 |
1989年 | 383篇 |
1988年 | 369篇 |
1987年 | 374篇 |
1986年 | 356篇 |
1985年 | 522篇 |
1984年 | 484篇 |
1983年 | 483篇 |
1982年 | 405篇 |
1981年 | 438篇 |
1980年 | 409篇 |
1979年 | 418篇 |
1978年 | 347篇 |
1977年 | 284篇 |
1976年 | 296篇 |
1975年 | 256篇 |
1974年 | 239篇 |
1973年 | 220篇 |
1972年 | 154篇 |
排序方式: 共有10000条查询结果,搜索用时 35 毫秒
921.
M. M. Yusof 《Statistica Neerlandica》2011,65(1):43-57
Tournament outcome uncertainty depends on: the design of the tournament; and the relative strengths of the competitors – the competitive balance. A tournament design comprises the arrangement of the individual matches, which we call the tournament structure, the seeding policy and the progression rules. In this paper, we investigate the effect of seeding policy for various tournament structures, while taking account of competitive balance. Our methodology uses tournament outcome uncertainty to consider the effect of seeding policy and other design changes. The tournament outcome uncertainty is measured using the tournament outcome characteristic which is the probability Pq,R that a team in the top 100q pre‐tournament rank percentile progresses forward from round R, for all q and R. We use Monte Carlo simulation to calculate the values of this metric. We find that, in general, seeding favours stronger competitors, but that the degree of favouritism varies with the type of seeding. Reseeding after each round favours the strong to the greatest extent. The ideas in the paper are illustrated using the soccer World Cup Finals tournament. 相似文献
922.
C. Michael Wittmann Author Vitae Shelby D. Hunt Author Vitae Dennis B. Arnett Author Vitae 《Industrial Marketing Management》2009,38(7):743-756
Business alliances, by filling critical resource gaps, enable firms to have positional advantages that lead to superior financial performance. Some alliances, however, are more successful than others. The three prominent theoretical approaches to explaining alliance success rely on resources, competences, and relational factors. The authors theorize that the three approaches are interdependent and, using resource-advantage (R-A) theory as a framework, develop an integrative model. This model proposes that the three approaches are linked by means of relationships among (1) alliance competence, (2) complementary resources, (3) idiosyncratic resources, and (4) cooperation. A test of the model, using a sample of alliance professionals, finds support for the theory that the three approaches are, indeed, interdependent and that resources, construed in the manner of R-A theory, influence alliance success through positional advantage. 相似文献
923.
Along with the oil price, concerns about the security of energy supply have soared once again in recent years. In this paper, we analyze Germany’s past und future energy security situation and compare it to that of other G7 countries using a statistical indicator of the long-term energy supply risk and empirical energy data for the years 1978 through 2007. We find that Germany’s energy supply risk has increased substantially since the oil price crises of the 1970s, whereas France and Japan have managed to reduce their risks dramatically, most notably through the deployment of nuclear power plants. Among G7 countries, Germany’s risk is only surpassed by that of Italy, while it can be expected that the German energy security situation may deteriorate in the future, not least due to the phase-out of nuclear power. 相似文献
924.
This study focuses explicitly on the methodological implications of the endogenous theory of governance as applied to firm performance. In particular, if firms choose their governance structures as part of a constrained performance maximization process, then application of an appropriate empirical methodology should reveal statistical evidence of such behavior. In this study we take advantage of the endogenous switching regression model framework to determine whether such predicted optimizing behavior can be corroborated by the data. The model allows us to test explicitly for selection behavior in accordance with comparative advantage and, concomitantly, the presence of selectivity bias, in estimating the impact of CEO duality on firm performance. The selection and performance equations are modeled in accordance with the extant accounting, economics, and management literature on the impact of the dual governance structure on firm performance. Overall, we tested four performance measures for the entire sample of firm‐year observations as well as for the largest three industries in terms of sample sizes. The major finding, robust in all cases, is that there is no evidence to support a contention that CEO duality is a structure purposefully chosen for optimizing performance. If firms are indeed choosing the dual leadership structure, they are doing so for reasons other than improving performance from what it would be otherwise. In fact, for performance measured as market return and earnings per share, there is evidence of a significant selectivity bias that acts to lower performance below what it would have been under random assignment. For performance measured by Tobin's q and return on assets, we found neither evidence of selectivity bias, nor any significant marginal performance impacts of CEO duality. Such findings are inconsistent with an endogenous governance theory, at least when applied to firm performance. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
925.
Mergers are generally conglomerate in nature with only minor (if any) horizontal overlaps. Under U.S. law, an enforcement
agency may challenge any anticompetitive aspect of the merger and the consequent delay associated with litigation would impose
costs on the firm. These costs may give the enforcement agency “leverage” to extract a settlement even when the firm would
prevail in court. This paper explores whether the FTC’s decisions to challenge transactions approximate the case law. We find
that the representative enforcement regimes of the FTC and the courts are remarkably similar, although the FTC credits efficiencies,
while courts consider buyer sophistication as a mitigating factor. 相似文献
926.
This paper examines how the ECB's expansionary monetary policy affects income inequality in 10 euro area countries over the period 1999–2014. We distinguish two channels—labor-market and financial—through which monetary policy can have distributional effects. The labor-market channel is captured by wages and employment and the financial channel by asset prices and returns. We find that expansionary monetary policy in the euro area reduces income inequality, especially in the periphery countries. The labor-market channel enhances the equalizing effect: monetary expansion reduces income inequality stronger by raising wages and employment. There is limited evidence for the financial channel. 相似文献
927.
Hong T. M. Bui Yehuda Baruch Vinh S. Chau Hong-Wei He 《Asia Pacific Journal of Management》2016,33(1):29-51
Team learning should be an important construct in organizational management research because team learning can enhance organizational learning and overall performance. However, there is limited understanding of how team learning works in different cultural contexts. Using an international comparative research approach, we developed a framework of antecedents and outcomes in the higher education context and tested it with samples from the UK and Vietnam. The results show that a common framework is applicable in the two different contexts, subject to slight modifications. However, this study does not find that team learning (measured via the proxy of “attitude towards team learning”) exhibits any statistically significant relationship as a predictor of the proposed outcomes. Other findings from this study on educational contexts are important not only to scholars in this field, but also for practicing managers, particularly those who study and operate in the extensive global market. 相似文献
928.
929.
930.
M. Agovino 《Quality and Quantity》2014,48(2):1045-1073
The aim of this paper is to investigate the causes of occupational diseases and accidents at work (ODA) in the Italian agricultural sector. To this end, we proceed with a two-stage analysis of Italian regional data for the period 1976–2004. The first phase of the analysis shows that in the Italian agricultural sector productivity Granger-causes ODA, and not vice versa. The results of the econometric estimates in the second stage of the analysis show that an increase in “productivity pressure” (associated with an increase in production rhythms) will produce, in the long run, an increase in accidents on less serious ODA (or temporary ODA); the same effect will not be observed on the more serious ODA (or permanent ODA). We verify how pro work legislation reduces ODA and how this effect is strengthened in the long-run. In addition, we observe that in the long-run the increase in the “pressure on workers” (associated with a high unemployment rate and a high probability of being fired) is the main cause of the increase in less and more serious ODA. 相似文献