全文获取类型
收费全文 | 28502篇 |
免费 | 1013篇 |
国内免费 | 532篇 |
专业分类
财政金融 | 2935篇 |
工业经济 | 1330篇 |
计划管理 | 5775篇 |
经济学 | 6014篇 |
综合类 | 3382篇 |
运输经济 | 366篇 |
旅游经济 | 610篇 |
贸易经济 | 3796篇 |
农业经济 | 2443篇 |
经济概况 | 3396篇 |
出版年
2024年 | 189篇 |
2023年 | 674篇 |
2022年 | 691篇 |
2021年 | 979篇 |
2020年 | 1254篇 |
2019年 | 887篇 |
2018年 | 835篇 |
2017年 | 1052篇 |
2016年 | 1024篇 |
2015年 | 1003篇 |
2014年 | 1906篇 |
2013年 | 2489篇 |
2012年 | 2251篇 |
2011年 | 2551篇 |
2010年 | 1805篇 |
2009年 | 1708篇 |
2008年 | 1901篇 |
2007年 | 1683篇 |
2006年 | 1437篇 |
2005年 | 1084篇 |
2004年 | 716篇 |
2003年 | 474篇 |
2002年 | 314篇 |
2001年 | 259篇 |
2000年 | 208篇 |
1999年 | 132篇 |
1998年 | 111篇 |
1997年 | 78篇 |
1996年 | 80篇 |
1995年 | 55篇 |
1994年 | 48篇 |
1993年 | 27篇 |
1992年 | 39篇 |
1991年 | 20篇 |
1990年 | 7篇 |
1989年 | 9篇 |
1988年 | 9篇 |
1987年 | 4篇 |
1986年 | 11篇 |
1985年 | 14篇 |
1984年 | 13篇 |
1983年 | 5篇 |
1982年 | 5篇 |
1981年 | 5篇 |
1980年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
61.
In this paper, progressive stress accelerated life tests are considered when the lifetime of a product under use condition
follows a finite mixture of distributions. The experiment is performed when each of the components in the mixture follows
a general class of distributions which includes, among others, the Weibull, compound Weibull, power function, Gompertz and
compound Gompertz distributions. It is assumed that the scale parameter of each component satisfies the inverse power low,
the progressive stress is directly proportional to time and the cumulative exposure model for the effect of changing stress
holds. Based on type-I censoring, the maximum likelihood estimates (MLEs) of the parameters under consideration are obtained.
A special attention is paid to a mixture of two Rayleigh components. Simulation results are carried out to study the precision
of the MLEs and to obtain confidence intervals for the parameters involved. 相似文献
62.
The Theory of Socially Embedded Games: Applications and Extensions to Open and Closed Games 总被引:1,自引:0,他引:1
An earlier article, drawing on the mathematical theory of rules and rule complexes, extends and generalizes game theory (GGT). The theory has been used to conceptualize and analyze diverse social relationships, roles, and games as particular types of rule complexes.For instance, a social role, as a major basis of a parent's action in a game, consists of at least four key components – which are mathematical objects – in the determination of action: value complex, model of reality (including beliefs and knowledge bases), a repertoire of acts, routines, programs, and strategies, and modality, a role-specific algorithm for determining or generating action in game settings. This article applies and extends GGT in analyses of a market bargaining game (a type of open game) and of the classical game of prisoners' dilemma (a type of closed game). The applications show the concrete effects of social embeddedness on game structuring, game interaction patterns and outcomes, and social equilibria. 相似文献
63.
VARMA (vector autoregressive moving average) processes are proposed for modelling cointegrated variables. For this purpose the echelon form is combined with the error correction form. Procedures for estimating the Kronecker indices which characterize the echelon form and for specifying the cointegration rank are discussed. The asymptotic distribution of the coefficient estimators is given. An example based o n US macroeconomic data illustrates the procedure and demonstrates its feasibility in practice. 相似文献
64.
供应链集成下的企业采购管理 总被引:6,自引:1,他引:6
供应链集成下的采购管理是供应链管理的重要内容之一,基于供应链的采购管理模型利用现代信息技术的成果解决了供应链中核心企业与供应商之间的联系问题。供应链集成下的企业采购管理策略从本质上讲是一种理念,旨在提高采购管理的效率,降低企业采购的成本,建立新的供需合作模式。 相似文献
65.
当前,汽车市场出现井喷式增长,各商业银行相继推出新的汽车金融业务.为应对外来汽车金融公司的同业竞争,避免再次陷入“车贷信用危机“,商业银行应积极借鉴国外的业务发展经验,针对自身业务发展障碍,制定合理的策略,审慎发展. 相似文献
66.
借鉴软件能力成熟度模型(CMM),构建了化工物流业成熟度模型(CL-CMM)。将物流企业成熟度分为初始期、成长期、成熟期、成熟巩固期、成熟创新期;从分析各个等级的关键过程,为化工物流业发展提供决策依据。并用成熟度曲线表示了化工物流业发展所经历的过程。 相似文献
67.
This paper applies Kim and Wardes (2004) stratified Warners randomized response model to Mangat and Singhs (1990) two-stage randomized response model. The proposed stratified randomized response model has an optimal allocation and a large gain in precision. Hence, the estimator based on the proposed method is more efficient than Kim and Wardes (2004) and Mangat and Singhs (1990) estimators under the conditions presented in both the case of completely truthful reporting and that of not completely truthful reporting by the respondents. 相似文献
68.
文章以一著名有色企业研发项目管理为例来分析传统大型企业研发项目管理模式,总结出研发项目管理模式的特点,即分散布局、意向指令与多头管理相结合。 相似文献
69.
70.