全文获取类型
收费全文 | 10109篇 |
免费 | 305篇 |
专业分类
财政金融 | 2077篇 |
工业经济 | 1011篇 |
计划管理 | 1791篇 |
经济学 | 2083篇 |
综合类 | 88篇 |
运输经济 | 122篇 |
旅游经济 | 202篇 |
贸易经济 | 1698篇 |
农业经济 | 548篇 |
经济概况 | 791篇 |
邮电经济 | 3篇 |
出版年
2023年 | 67篇 |
2021年 | 92篇 |
2020年 | 171篇 |
2019年 | 235篇 |
2018年 | 246篇 |
2017年 | 256篇 |
2016年 | 243篇 |
2015年 | 190篇 |
2014年 | 279篇 |
2013年 | 1180篇 |
2012年 | 326篇 |
2011年 | 368篇 |
2010年 | 325篇 |
2009年 | 413篇 |
2008年 | 403篇 |
2007年 | 340篇 |
2006年 | 350篇 |
2005年 | 303篇 |
2004年 | 291篇 |
2003年 | 306篇 |
2002年 | 278篇 |
2001年 | 234篇 |
2000年 | 235篇 |
1999年 | 216篇 |
1998年 | 196篇 |
1997年 | 209篇 |
1996年 | 170篇 |
1995年 | 170篇 |
1994年 | 158篇 |
1993年 | 149篇 |
1992年 | 133篇 |
1991年 | 128篇 |
1990年 | 116篇 |
1989年 | 104篇 |
1988年 | 93篇 |
1987年 | 103篇 |
1986年 | 76篇 |
1985年 | 121篇 |
1984年 | 145篇 |
1983年 | 134篇 |
1982年 | 113篇 |
1981年 | 87篇 |
1980年 | 96篇 |
1979年 | 85篇 |
1978年 | 66篇 |
1977年 | 63篇 |
1976年 | 62篇 |
1975年 | 35篇 |
1974年 | 50篇 |
1973年 | 45篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
We examine Kreps' conjecture that optimal expected utility in the classic Black–Scholes–Merton (BSM) economy is the limit of optimal expected utility for a sequence of discrete‐time economies that “approach” the BSM economy in a natural sense: The nth discrete‐time economy is generated by a scaled n‐step random walk, based on an unscaled random variable ζ with mean 0, variance 1, and bounded support. We confirm Kreps' conjecture if the consumer's utility function U has asymptotic elasticity strictly less than one, and we provide a counterexample to the conjecture for a utility function U with asymptotic elasticity equal to 1, for ζ such that . 相似文献
2.
3.
4.
5.
6.
Despite being generally well studied, emotional stability (ES) has not yet been widely accepted as a satisfactory and solidly valid theoretical construct. Without a clearly defined and validated construct, it is difficult to infer what ES means for the behavior and decisions of individuals as well as the performance of groups and organizations. Based on self-organization theory, this study infers a two dimensional construct for ES (threshold and recovery) under the framework of dynamic change and complexity. Two studies were conducted in China to develop and examine the construct of ES in an organizational context. The psychometric examination indicated that the newly developed construct of ES has discriminant and convergent validity with respect to different though related constructs such as the Big Five personality model and emotional intelligence (EI). It also demonstrates incremental validity in predicting group leadership, job satisfaction, job self-efficacy, and commitment. The findings also demonstrate that ES moderates the relationship between individual commitment and group relationship conflict. The results indicate that self-ratings effectively reflect the theoretical construct, whereas peer ratings and supervisor ratings create different biases. Additional theory, empirical, and methodological contributions are also discussed. 相似文献
7.
The question of tank failure is addressed for both cryogenic (LFG) and atmospheric (Crude Oil) designs. An analysis of the consequences of an assumed axisymmetric mode of failure of a liquid storage tank is presented in an effort to answer the question. 相似文献
8.
CHETAH, which stands for the Chemical Thermodynamic and Energy Release Program, was introduced in 1974. Since then, the CHETAH program has been widely used in the chemical industry for hazard evaluation. Although its chief aim is to predict deflagration/detonation potential from molecular structure, it can also be used to estimate heats of reaction, heat capacities, and entropies. One of the limitations of the original program was its rigid, punched card oriented format for data input and the lack of an overall hazard rating derived from the several hazard criteria. A new release of this program alleviates these shortcomings and includes other improvements. The main features of the new release are: 1) a totally interactive front end, 2) an interpreter subroutine which uses sophisticated pattern recognition techniques to combine the four hazard criteria into an overall hazard rating, 3) recognition of certain atomic groupings which are known to be sensitive, 4) correct handling of the symmetry number, and 5) an updated data bank. One of the most important features of this release is its availability in an IBM PC compatible version, making the program accessible to more users. 相似文献
9.
David P. Ellerman 《Metroeconomica》1990,41(3):259-276
The paper mathematically develops the heuristic idea that the first-order necessary conditions for a classical constrained optimization problem are equivalent to a market being arbitrage-free - with the Lagrange multipliers being the arbitrage-free market prices. The arbitrage notions start with the multiplicative Kirchhoff's Voltage Law and then generalize to matrix algebra. The basic result shows the normalized arbitrage-free «market prices» (the Lagrange multipliers) resulting from a classical constrained optimizaton problem can always be obtained as a ratio of cofactors. The machinery also gives an economic interpretation of Cramer's Rule as a competitive equilibrium condition. 相似文献
10.