全文获取类型
| 收费全文 | 13004篇 |
| 免费 | 580篇 |
| 国内免费 | 44篇 |
专业分类
| 财政金融 | 1535篇 |
| 工业经济 | 743篇 |
| 计划管理 | 2568篇 |
| 经济学 | 2395篇 |
| 综合类 | 2225篇 |
| 运输经济 | 58篇 |
| 旅游经济 | 105篇 |
| 贸易经济 | 1541篇 |
| 农业经济 | 773篇 |
| 经济概况 | 1685篇 |
出版年
| 2025年 | 53篇 |
| 2024年 | 121篇 |
| 2023年 | 156篇 |
| 2022年 | 191篇 |
| 2021年 | 258篇 |
| 2020年 | 352篇 |
| 2019年 | 258篇 |
| 2018年 | 218篇 |
| 2017年 | 285篇 |
| 2016年 | 311篇 |
| 2015年 | 414篇 |
| 2014年 | 765篇 |
| 2013年 | 731篇 |
| 2012年 | 1115篇 |
| 2011年 | 1254篇 |
| 2010年 | 972篇 |
| 2009年 | 842篇 |
| 2008年 | 1004篇 |
| 2007年 | 939篇 |
| 2006年 | 849篇 |
| 2005年 | 696篇 |
| 2004年 | 467篇 |
| 2003年 | 377篇 |
| 2002年 | 283篇 |
| 2001年 | 221篇 |
| 2000年 | 134篇 |
| 1999年 | 91篇 |
| 1998年 | 53篇 |
| 1997年 | 55篇 |
| 1996年 | 38篇 |
| 1995年 | 38篇 |
| 1994年 | 21篇 |
| 1993年 | 15篇 |
| 1992年 | 10篇 |
| 1991年 | 8篇 |
| 1990年 | 3篇 |
| 1989年 | 2篇 |
| 1988年 | 2篇 |
| 1987年 | 1篇 |
| 1985年 | 2篇 |
| 1984年 | 9篇 |
| 1983年 | 3篇 |
| 1982年 | 4篇 |
| 1981年 | 3篇 |
| 1979年 | 3篇 |
| 1978年 | 1篇 |
排序方式： 共有10000条查询结果，搜索用时 0 毫秒
241.
Frank Krummenauer 《Metrika》1998,47(1):47-69
According to the usual law of small numbers a multivariate Poisson distribution is derived by defining an appropriate model for multivariate Binomial distributions and examining their behaviour for large numbers of trials and small probabilities of marginal and simultaneous successes. The weak limit law is a generalization of Poisson's distribution to larger finite dimensions with arbitrary dependence structure. Compounding this multivariate Poisson distribution by a Gamma distribution results in a multivariate Pascal distribution which is again asymptotically multivariate Poisson. These Pascal distributions contain a class of multivariate geometric distributions. Finally the bivariate Binomial distribution is shown to be the limit law of appropriate bivariate hypergeometric distributions. Proving the limit theorems mentioned here as well as understanding the corresponding limit distributions becomes feasible by using probability generating functions. 相似文献
242.
进入21世纪以来,人们生活水平不断提高,现代社会对建筑施工项目整体质量要求越来越高。随着高层建筑物数量的增加,建筑物中高层框剪结构住宅楼板施工面临着更大的挑战。要想满足现代社会对建筑整体质量的实际要求,施工企业必须结合实际建设状况,不断强化中高层框剪结构住宅楼板施工,为提升建筑物的整体质量提供技术保障。但是,在实际施工建设过程中,建筑物中高层框剪结构住宅楼板施工受诸多因素的影响仍存在较多问题,如楼板开裂、脱落以及老化等。中高层框架结构一旦出现质量问题,建筑物整体质量将受到严重削弱。因此,建筑施工企业必须采用新技术、新工艺和新材料有效预防和处理中高层框剪结构楼板开裂问题。 相似文献
243.
244.
Past literature in board research has centred on board structure and company performance. Over the years, empirical studies do not reveal a conclusive relationship between these two variables (Dalton and Daily, 1999. Across the Board, March, 28–32). Until recently, the literature on board processes has been sparse. The reason for insufficient empirical work on board processes possibly is due to the difficulty of gaining access to boards. In this paper, we propose a conceptual model and tested the model on publicly listed companies in Singapore. Based on a sample of 212 company responses and 299 directors, we conclude that board structure does not affect board process while board process is related to board performance. In terms of individual parameters, effort norms, cognitive conflict and the presence and usage of skills are positively related to board roles and board transparency. Also, affective and process conflicts are negatively related to board roles and board transparency. Finally, board process does not mediate the relationship between board structure and board performance. 相似文献
245.
246.
企业转投资与资本结构关系涉及到代理成本效应、共担保效应与内部融资市场效应。本文采用1998年至2002年沪深两市的上市公司的数据进行了实证研究,结果表明：企业的转投资与资本结构呈现显著地负相关关系,说明转投资的代理成本效应与内部融资市场效应明显。 相似文献
247.
There is a need for regional studies of women on corporate boards to capture experiences of smaller companies and to understand the nature of local resources for expanding the pool of women candidates for board seats. New findings from a statewide study of women on corporate boards are reported. The paper examines the status of women on corporate boards compared to other regions in the United States and around the world. Change efforts of governments and professional organisations for helping women overcome barriers to the boardroom are described to demonstrate the need for local knowledge in determining an effective change approach. Results from this study indicate that the local pool of women in academia and consulting has provided alternative routes to the boardroom. This knowledge can be used to direct change efforts for promoting women on boards. Practical implications are discussed for women seeking board seats and for firms seeking qualified women director candidates. 相似文献
248.
This paper investigates the impact of managerial moral hazard on the debt overhang of a firm by constructing a contingent claims model in which the manager faces costly effort. Using a calibrated capital structure model, we show that the costs of debt overhang become more serious in the presence of managerial moral hazard. Such costs even account for more than half of the total agency costs at a high level of cash flow. Moreover, in contrast to the results of Hackbarth and Mauer (2012), our model predicts a U-shaped relationship between the leverage ratio and investment opportunities of a firm, which is caused by managers’ moral hazard. Finally, by considering this moral hazard, we also show the coexistence of low leverage ratios and high credit spreads, which explains the phenomenon of “low debt levels and high credit spreads” observed in practice. 相似文献
249.
自动化仓库巷道堆垛机的计算机辅助设计 总被引：7，自引：0，他引：7
本文在建立三种结构形式堆垛机力学模型的基础上,运用机械和结构设计理论、计算机和数据库技术,提出堆垛机的计算机辅助设计方法和软件 相似文献
250.