全文获取类型
收费全文 | 11070篇 |
免费 | 416篇 |
国内免费 | 133篇 |
专业分类
管理学 | 767篇 |
劳动科学 | 36篇 |
民族学 | 263篇 |
人才学 | 8篇 |
人口学 | 246篇 |
丛书文集 | 2946篇 |
理论方法论 | 473篇 |
综合类 | 5087篇 |
社会学 | 790篇 |
统计学 | 1003篇 |
出版年
2024年 | 10篇 |
2023年 | 57篇 |
2022年 | 185篇 |
2021年 | 194篇 |
2020年 | 129篇 |
2019年 | 133篇 |
2018年 | 194篇 |
2017年 | 276篇 |
2016年 | 195篇 |
2015年 | 370篇 |
2014年 | 390篇 |
2013年 | 684篇 |
2012年 | 656篇 |
2011年 | 763篇 |
2010年 | 848篇 |
2009年 | 813篇 |
2008年 | 783篇 |
2007年 | 797篇 |
2006年 | 795篇 |
2005年 | 690篇 |
2004年 | 373篇 |
2003年 | 289篇 |
2002年 | 363篇 |
2001年 | 308篇 |
2000年 | 204篇 |
1999年 | 224篇 |
1998年 | 134篇 |
1997年 | 134篇 |
1996年 | 130篇 |
1995年 | 120篇 |
1994年 | 72篇 |
1993年 | 66篇 |
1992年 | 38篇 |
1991年 | 39篇 |
1990年 | 34篇 |
1989年 | 34篇 |
1988年 | 23篇 |
1987年 | 14篇 |
1986年 | 14篇 |
1985年 | 16篇 |
1984年 | 5篇 |
1983年 | 5篇 |
1981年 | 4篇 |
1980年 | 4篇 |
1978年 | 2篇 |
1977年 | 1篇 |
1976年 | 3篇 |
1974年 | 1篇 |
1973年 | 1篇 |
1970年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 203 毫秒
991.
目前有关烃类流体相态的研究已较为成熟,能为油气田的高效开发提供相应的理论指导和技术支持。但研究成果大多忽略多孔介质对流体相态的影响。为此,在充分考虑流体与多孔介质相互作用的基础上,开展多孔介质内流体相态特征的研究十分必要。随着研究的不断深入,超声波探测技术不受压力温度限制、不改变流体成分、检测成本低、对人体无害等优点逐渐得到重视,并在多孔介质内相态研究领域逐渐得到了应用。在参考国内外相关文献资料的基础上,简述了超声波的探测机理,重点综述了超声波探测在多孔介质内天然气水合物、凝析油气相态特征研究的应用进展,并指出了目前存在的主要问题及今后的研究重点。 相似文献
992.
In this paper, we provide some exponential inequalities for extended negatively dependent (END) random variables. By using these exponential inequalities and the truncated method, we investigate the complete consistency for the estimator of nonparametric regression model based on END errors. As an application, the complete consistency for the nearest neighbour estimator is obtained. 相似文献
993.
994.
995.
996.
997.
Zhanshou Chen 《统计学通讯:模拟与计算》2015,44(1):71-87
In this article, we propose a moving kernel-weighted variance ratio statistic to monitor persistence change in infinite variance observations. We focus on I(1) to I(0) persistence change for sequences in the domain of attraction of a stable law and local-to-finite variance sequences. The null distribution of the monitoring statistic and its consistency are proved. In particular, a bootstrap procedure is proposed to determine the critical values for the derived asymptotic distribution depends on unknown tail index. The small sample performances of proposed monitoring procedure are illustrated by both simulation and application to a high frequency financial data. 相似文献
998.
In this article we consider the two-way ANOVA model without interaction under heteroscedasticity. For the problem of testing equal effects of factors, we propose a parametric bootstrap (PB) approach and compare it with existing the generalized F (GF) test. The Type I error rates and powers of the tests are evaluated using Monte Carlo simulation. Our studies show that the PB test performs better than the GF test. The PB test performs very satisfactorily even for small samples while the GF test exhibits poor Type I error properties when the number of factorial combinations or treatments goes up. It is also noted that the same tests can be used to test the significance of random effect variance component in a two-way mixed-effects model under unequal error variances. 相似文献
999.
We consider a retailer’s decision of whether to develop an internally produced, private label version of a national brand and the role that this decision plays in coordinating the supply chain. Our model assumes that the perceived quality of the private label is lower than that of the national brand, and we allow for the two products to have different marginal costs. We further allow for a fixed development cost that the retailer must incur to develop private label capability, and distinguish two types of private labels depending upon whether they would or would not be developed as product line extensions by a vertically integrated supply chain. We refer to these two types as first‐best (FB) and non‐first‐best (NFB) product line extensions, respectively. When the private label can be characterized as a NFB product line extension, its development creates adverse cannibalization effects, yet it also helps to mitigate the effects of double marginalization with respect to the national brand. We characterize the conditions under which the retailer will develop private label capability, and distinguish among the conditions under which this is either beneficial or detrimental to the overall performance of the supply chain. 相似文献
1000.
改革,就其本质而言,是相关主体之间价值体系的重新构建,因此确定改革的目标价值是一切改革的关键。在司法改革中,当事人始终是司法活动的最直接受益者,他们通过支付一定的代价获得司法服务,其地位相当于是消费者。从消费界域透视司法改革,首先必须确立以当事人为中心的价值体系,进而确立改革的目标和重点,从而全面、系统地推进司法体制的改革。 相似文献