全文获取类型
收费全文 | 11230篇 |
免费 | 3990篇 |
专业分类
财政金融 | 843篇 |
工业经济 | 1701篇 |
计划管理 | 1389篇 |
经济学 | 3478篇 |
综合类 | 148篇 |
运输经济 | 35篇 |
旅游经济 | 24篇 |
贸易经济 | 3442篇 |
农业经济 | 2632篇 |
经济概况 | 1517篇 |
邮电经济 | 11篇 |
出版年
2024年 | 183篇 |
2023年 | 413篇 |
2022年 | 263篇 |
2021年 | 202篇 |
2020年 | 525篇 |
2019年 | 1033篇 |
2018年 | 820篇 |
2017年 | 867篇 |
2016年 | 761篇 |
2015年 | 673篇 |
2014年 | 772篇 |
2013年 | 1128篇 |
2012年 | 1032篇 |
2011年 | 728篇 |
2010年 | 730篇 |
2009年 | 695篇 |
2008年 | 455篇 |
2007年 | 552篇 |
2006年 | 449篇 |
2005年 | 430篇 |
2004年 | 420篇 |
2003年 | 276篇 |
2002年 | 204篇 |
2001年 | 144篇 |
2000年 | 104篇 |
1999年 | 96篇 |
1998年 | 104篇 |
1997年 | 93篇 |
1996年 | 72篇 |
1995年 | 56篇 |
1994年 | 56篇 |
1993年 | 68篇 |
1992年 | 83篇 |
1991年 | 104篇 |
1990年 | 45篇 |
1989年 | 45篇 |
1988年 | 23篇 |
1987年 | 19篇 |
1985年 | 27篇 |
1984年 | 20篇 |
1983年 | 30篇 |
1982年 | 36篇 |
1981年 | 18篇 |
1980年 | 27篇 |
1979年 | 25篇 |
1978年 | 21篇 |
1975年 | 17篇 |
1971年 | 16篇 |
1969年 | 18篇 |
1963年 | 20篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
41.
Modeling Conditional Yield Densities 总被引:2,自引:0,他引:2
Given the increasing interest in agricultural risk, many have sought improved methods to characterize conditional crop-yield densities. While most have postulated the Beta as a flexible alternative to the Normal, others have chosen nonparametric methods. Unfortunately, yield data tends not to be sufficiently abundant to invalidate many reasonable parametric models. This is problematic because conclusions from economic analyses, which require estimated conditional yield densities, tend not to be invariant to the modeling assumption. We propose a semiparametric estimator that, because of its theoretical properties and our simulation results, enables one to empirically proceed with a higher degree of confidence. 相似文献
42.
A model of farmer decision making is developed to determine the extent to which uncertainties about soil fertility and weather affect the value of site-specific technologies (SSTs) using jointly estimated risk and technology parameters. Uncertainty can lead risk-averse farmers to apply more fertilizers and generate more pollution than in the certainty case. Ignoring uncertainty and risk aversion would overestimate the economic and environmental benefits of SSTs and underestimate the subsidy required to induce adoption. Accounting for uncertainties and risk preferences might explain the low observed adoption rates of SSTs. Improving the accuracy of SSTs would increase the incentives for adoption. 相似文献
43.
通过对《形状和位置公差》新、旧国际的对比,综述了新、旧标准间的不同之处、便于迅速了解和应用新标准。 相似文献
44.
Summary Standard laboratory posted-offer markets respond slowly and incompletely to demand shocks. In these one-sided markets, where sellers control the setting of prices, very little information is transmitted via the process of exchange. For this reason, traders have trouble distinguishing randomness in their own experience from changes in market fundamentals. This paper reports the results of twelve laboratory markets conducted to assess whether some common variants to standard posted-offer rules can correct the adjustment deficiences. Although discounting, multiple postings and excess demand information all improve performance, we find that response remains poor, and efficiencies low.Support for this research was provided by the National Science Foundation (SBR 9319842 and SBR 9320044), and the University of Virginia Bankard Fund. Data are archived at FTP address: fido.econlab.arizona.edu. We wish to thank Charles Plott and Shyam Sunder for useful comments on an earlier draft of this paper. The usual disclaimer applies. 相似文献
45.
Abstract: This paper examines the characteristics of firms that account for deferred tax liabilities related to government investment grants under an extended adoption timing period. Not only the recognition but also the timing decision is associated with changes in future performance and changes in the debt structure. Recognisers outperform non‐recognisers in the future, while early recognition is related to post recognition performance but only for those firms that currently perform well. Changes in the balance sheet structure are also related to both decisions. Firms with recent increases in the debt level tend to postpone recognition, while currently well‐performing firms that increase their future debt level are less likely to recognise deferred taxes. 相似文献
46.
Fang Cai director professor Institute of Population Labor Economics Chinese Academy ofSocial Sciences assistant professor Institute of Populationand Labor Economics Chinese Academy of Social Sciences. Du associate professor Institute of Population Labor Economics Chinese Academy of Social Sciences. 《中国与世界经济(英文版)》2005,(1)
I.IntroductionSincethelate1990s,China’slabor market has comeundergreat pressure,asreflected by anincreasing unemployment rate,and adeclining labor force participation rate.The causesofthe severe unemployment are threefold.First,due to the macro-economic downturn andrapid industrial structural change in the late1990s,state-owned enterprises(SOEs),whichlost their comparative advantage and competitiveness,have been unable to fully utilizetheir production capacity,and have become loss-makers.Se… 相似文献
47.
This article addresses the societal and cultural aspects of bioreserves and environmental restoration programmes. It begins with a discussion of bioreserves, then uses the example of a Man and Biosphere (MAB) inspired study of the US Everglades to illustrate how land has been shaped historically by culture and technology. It then demonstrates how current conflicts of values and culture, from both inside and outside the region, from interest groups with both pragmatic and emotional stances, are determining the future of an environment—the Everglades. The article thereby shows how human values and perceptions impact on the development of a sustainable Everglades, using the findings of surveys and public meetings to highlight the interests of the competing communities, ethnic and interest groups involved. If bioreserves are to survive they cannot become alienated from the people in the regions in which they are located. 相似文献
48.
Operational Research and the environment 总被引:1,自引:1,他引:0
The discipline of Operational Research (OR) is primarily concerned with improving the effectiveness and efficiency of decision processes. These processes take place everywhere in society: industry, banking, agriculture, government, politics. Frequent use of mathematical optimization models is typical of OR. Since the early '80s these models are increasingly packaged in a user-friendly way, as Decision Support Systems. In the following we will illustrate how OR can be used to describe and solve a number of environmental problems. 相似文献
49.
Charles Van Marrewijk 《De Economist》1992,140(3):357-372
Summary In a small open economy it is optimal to first maximize national income and second choose the best consumption point.The same two-step procedure under (quantitative) uncertainty is suboptimal if one of the goods is used as numéraire. Optimality is restored however, if nominal prices are deflated by the exact price index. Hence there is equivalence between the appropriate two-step procedure and the introduction of a stock market under uncertainty (Diamond 1967) under ideal circumstances.I would like to thank, without implicating, Peter van Bergeijk, Steven Brakman, Willem Buiter, Richard Gigengack, Jean-Marie, Viaene, Casper de Vries and an anonymous referee for useful comments and Angelique van Haasteren and Martijn Herrmann for graphical assistance. 相似文献
50.