全文获取类型
收费全文 | 12401篇 |
免费 | 255篇 |
专业分类
财政金融 | 2193篇 |
工业经济 | 861篇 |
计划管理 | 2061篇 |
经济学 | 2655篇 |
综合类 | 94篇 |
运输经济 | 78篇 |
旅游经济 | 166篇 |
贸易经济 | 1909篇 |
农业经济 | 710篇 |
经济概况 | 1887篇 |
信息产业经济 | 1篇 |
邮电经济 | 41篇 |
出版年
2020年 | 110篇 |
2019年 | 178篇 |
2018年 | 269篇 |
2017年 | 244篇 |
2016年 | 244篇 |
2015年 | 155篇 |
2014年 | 263篇 |
2013年 | 1071篇 |
2012年 | 354篇 |
2011年 | 350篇 |
2010年 | 291篇 |
2009年 | 349篇 |
2008年 | 340篇 |
2007年 | 292篇 |
2006年 | 284篇 |
2005年 | 241篇 |
2004年 | 247篇 |
2003年 | 238篇 |
2002年 | 249篇 |
2001年 | 220篇 |
2000年 | 251篇 |
1999年 | 218篇 |
1998年 | 205篇 |
1997年 | 186篇 |
1996年 | 202篇 |
1995年 | 182篇 |
1994年 | 193篇 |
1993年 | 190篇 |
1992年 | 209篇 |
1991年 | 205篇 |
1990年 | 207篇 |
1989年 | 178篇 |
1988年 | 144篇 |
1987年 | 152篇 |
1986年 | 169篇 |
1985年 | 247篇 |
1984年 | 224篇 |
1983年 | 197篇 |
1982年 | 199篇 |
1981年 | 199篇 |
1980年 | 188篇 |
1979年 | 189篇 |
1978年 | 166篇 |
1977年 | 153篇 |
1976年 | 148篇 |
1975年 | 150篇 |
1974年 | 116篇 |
1973年 | 115篇 |
1972年 | 107篇 |
1971年 | 83篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
This paper has three goals. First, we demonstrate that standard arguments and methods from production and duality analysis
can be used to provide a comprehensive and general treatment of the value of information for a risk-averse firm with expected-utility
(linear-in-probabilities) preferences and a general stochastic technology. Second, we place bounds on the value of information
for a risk-averse firm and relate these bounds to characteristics of the technology and the producer’s preferences. The third
and final goal is to derive the implications that information differences can have for measured efficiency differences and
to relate the bounds on the value of information to those measured differences.
相似文献
102.
This article examines relationships between receipt of internal administrative information in hospitals, influence over general management decisions, and the extent to which certain organizational characteristics predict the receipt of information by each of the three major groups in hospitals: the board, the CEO, and the medical staff. Using a US national sample of 287 non-profit community hospitals, CEOs were found to receive the greatest amount of information and had highest influence while medical staffs were lowest on both measures. of five major organizational characteristics, hospital size emerged as the single strongest predictor of receipt of information for both boards (beta =?0.28, p 0.001) and medical staffs (beta =?0.42, p 0.001). Overall, the five dependent variables explained 18 per cent of the variance in receipt of information by boards and 28 percent of the variance for medical staffs. 相似文献
103.
104.
105.
THE INFLUENCE OF ORGANIZATION STRUCTURE ON THE UTILITY OF AN ENTREPRENEURIAL TOP MANAGEMENT STYLE 总被引:11,自引:0,他引:11
This study examined the influence of organization structure on the relationship between top management's entrepreneurial orientation and financial performance. Moderated regression analysis was used to analyse data collected from 80 business organizations. the findings suggest that an entrepreneurial top management style has a positive effect on the performance of organically-structured firms and a negative effect on the performance of mechanistically-structured firms. 相似文献
106.
Summary A procedure is proposed in this paper for testing the shape parameter, of the Weibull distribution. The test statistic which is based on the extremal quotient, possesses a monotone property which makes it possible for rejection earlier than the last planned observation of the null hypothesis,H
0: =0 when the alternative hypothesis isH
a: <0 and early acceptance ofH
0 whenH
a: >0. The test being scale-free, does not require the scale parameter to be known. 相似文献
107.
Prof. Dr. G. Bruckmann 《Metrika》1969,14(1):183-213
Zusammenfassung Nach einer kritischen Analyse der Begriffe „absolute“ und „relative“ Konzentration werden einige Kriterien gegeben, die Ma?zahlen
der absoluten oder der relativen Konzentration zu erfüllen haben. Hierauf wird untersucht, inwieweit die gebr?uchlichsten
Ma?zahlen der Konzentration (Gini, Herfindahl, Münzner) diese Kriterien erfüllen. Dann wird gezeigt, da? sich eine vonAdam angegebene, sehr allgemeine Klasse von Ma?zahlen als Ma?zahlen der absoluten Konzentration qualifizieren; einige wichtige
Spezialf?lle werden genauer untersucht. Im vorletzten Teil der Arbeit werden Ma?zahlen für die Ver?nderung der Konzentration
diskutiert und schlie?lich an einem praktischen Beispiel erprobt.
Summary After analysing the concepts of “absolute concentration” versus “relative concentration”, some criteria for coefficients of concentration are given to qualify them either as measures for absolute or for relative concentration. On the basis of these criteria, some well-known coefficients (Gini, Herfindahl, Münzner) are examined. Furthermore, it is shown that the measures of “predictivity” as given byAdam can be regarded as coefficients of absolute concentration; some important special cases (one of which the Herfindahl index) are investigated. Finally, measures for the change in concentration are developed and applied to a practical example.相似文献
108.
Parcel data on residential land conversion are used to investigate how land use externalities influence the rate of development and modify policies designed to manage urban growth and preserve open space. Several “smart growth” policies are found to significantly influence land conversion, including a development clustering policy that concentrates development and generates preserved open space. In addition to directly affecting a parcel's hazard rate of conversion, this policy is found to affect neighboring parcels' conversion by generating a positive open space externality that hastens their development. The implication that the clustering policy could generate a more sprawled pattern of development is explored using spatial simulation. 相似文献
109.
Injection drug users (IDUs) transmit the human immunodeficiency virus (HIV) via both needle sharing and sex. Available interventions for this population have varying costs and effectiveness and focus on different risk behaviors. In this analysis, we look at two interventions. One is inexpensive, broad-based and provides modest risk reductions (street outreach (SO)); the other is narrowly focused, expensive and relatively effective (methadone maintenance). This analysis explores the effects of population risk behavior, intervention effectiveness, intervention costs, and decision constraints when allocating funds between these two interventions to maximize effectiveness. We develop a model of the spread of HIV, dividing IDUs into susceptibles (uninfected) and infectives, and separately portraying sex and injection risk. We simulate the epidemic in New York City for time periods from the mid-1980s to the early 1990s, and incorporate the behavioral effects of two interventions performed singly or in combination to find the allocation that maximizes the number of infections averted in the IDUs and their noninjecting sex partners, assuming interventions have increasing marginal costs. We find that the optimal allocation nearly always involves spending the maximum allowable amount on SO. This result is largely insensitive to variations in risk parameters, intervention efficacy, or cost. The model's structure, however, makes clear that many factors contribute to this insensitivity, namely the scope of the interventions, the dual drug/sex nature of HIV risk in the population, the asymmetry of sexual risk for men and women, and the potential benefits to nonIDUs. 相似文献
110.
In order to explain coexistence of a deductible for low values of the loss and an upper limit for high values of the loss in insurance contracts, we consider the exchange of risk between two rank dependent expected utility maximizers. It is shown that if the insurer (insured) takes more into account the lowest outcomes – hence maximal losses – than the insured (insurer), then the optimal contract has an upper limit (includes a deductible for high values of the loss). If furthermore, the insured (insurer) neglects the highest outcomes while the insurer (insured) does not, the optimal contract includes a deductible (full insurance) for low values of the loss. 相似文献