全文获取类型
收费全文 | 17834篇 |
免费 | 638篇 |
国内免费 | 165篇 |
专业分类
管理学 | 964篇 |
劳动科学 | 60篇 |
民族学 | 579篇 |
人才学 | 16篇 |
人口学 | 318篇 |
丛书文集 | 5241篇 |
理论方法论 | 952篇 |
综合类 | 7956篇 |
社会学 | 1048篇 |
统计学 | 1503篇 |
出版年
2024年 | 9篇 |
2023年 | 88篇 |
2022年 | 241篇 |
2021年 | 231篇 |
2020年 | 229篇 |
2019年 | 191篇 |
2018年 | 242篇 |
2017年 | 411篇 |
2016年 | 282篇 |
2015年 | 557篇 |
2014年 | 688篇 |
2013年 | 1010篇 |
2012年 | 916篇 |
2011年 | 1316篇 |
2010年 | 1358篇 |
2009年 | 1441篇 |
2008年 | 1248篇 |
2007年 | 1515篇 |
2006年 | 1528篇 |
2005年 | 1217篇 |
2004年 | 649篇 |
2003年 | 512篇 |
2002年 | 551篇 |
2001年 | 472篇 |
2000年 | 328篇 |
1999年 | 280篇 |
1998年 | 159篇 |
1997年 | 171篇 |
1996年 | 173篇 |
1995年 | 126篇 |
1994年 | 105篇 |
1993年 | 85篇 |
1992年 | 83篇 |
1991年 | 55篇 |
1990年 | 39篇 |
1989年 | 30篇 |
1988年 | 37篇 |
1987年 | 22篇 |
1986年 | 8篇 |
1985年 | 12篇 |
1984年 | 7篇 |
1983年 | 4篇 |
1982年 | 1篇 |
1981年 | 5篇 |
1980年 | 5篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
911.
Copulas have proved to be very successful tools for the flexible modeling of dependence. Bivariate copulas have been deeply researched in recent years, while building higher-dimensional copulas is still recognized to be a difficult task. In this paper, we study the higher-dimensional dependent reliability systems using a type of decomposition called “vine,” by which a multivariate distribution can be decomposed into a cascade of bivariate copulas. Some equations of system reliability for parallel, series, and k-out-of-n systems are obtained and then decomposed based on C-vine and D-vine copulas. Finally, a shutdown system is considered to illustrate the results obtained in the paper. 相似文献
912.
我国融资融券制度不同于国外成熟市场的一个重要特征是存在较大的卖空摩擦,但这一卖空摩擦对市场定价效率的影响及其作用机制尚未被研究揭示.本文运用双重差分固定效应模型、处理效应模型和倾向性匹配双重差分模型,研究了融资融券制度中的卖空摩擦对市场定价效率的影响及其内在机制.实证结果表明,融资融券制度中的卖空摩擦抑制了市场参与者对公司特质信息的充分挖掘,促使其过度利用市场或行业信息进行交易,从而延缓了公司特质信息融入股价,加速了市场或行业信息融入股价,最终加剧了股价同涨同跌现象,不利于市场定价效率的提高.本文研究结论为监管部门合理扩大融资融券标的范围、降低交易成本和交易门槛,营造高效的市场环境提供了依据和思路. 相似文献
913.
914.
基于区域技术异质性假定与共同边界理论,文章将大气污染排放物视为非期望产出,利用考虑投入产出松弛变量的SBM-Undesirable方法系统考察2006-2013年中国省域大气环境效率与大气环境治理技术的差异性,运用面板计量Tobit回归模型定量考察省域大气环境效率水平及其治理技术的影响机制.结果表明,中国大气环境效率较低且区域差异明显,三大区域之间大气环境治理技术落差较大,大气污染减排潜力巨大;经济增长、产业结构优化、科技创新、提升贸易开放度有利于促进大气环境效率及其治理技术的改善,相比之下,煤炭消费比重的提高与财政分权则起到了明显抑制作用. 相似文献
915.
Ernest Gonzales Lisa A. Marchiondo Jing Tan Yi Wang Huajuan Chen 《Journal of gerontological social work》2017,60(3):245-254
ABSTRACTThe Aging Semantic Differential (ASD) is the most widely used instrument to measure young people’s attitudes towards older adults. This study translated the ASD to Mandarin and examined its psychometric properties. The Mandarin-ASD contains three latent factors (Personality and Mental Health, Societal Participation, and Physical) that have high internal reliability and reasonable discriminate validity. Social work researchers, practitioners and allied professionals may utilize the ASD-Mandarin instrument to measure young people’s attitudes towards older adults in China. We issue a call for a universal-ASD that can be applied across different cultural contexts. 相似文献
916.
917.
The new rural cooperative medical system (NCMS) is the primary form of social insurance in rural China. This study aims to explore how the NCMS influences the health care seeking behaviors of middle-aged and older Chinese, considering the family and community contexts. A series of multi-level (three-level) models using data from the first wave of the China Health and Retirement Longitudinal Study (CHARLS) are used. We find that the presence of NCMS coverage has a statistically significant association with seeking inpatient and outpatient care but not physical checkups among middle-aged and older rural Chinese: Rural residents insured by NCMS were more likely to seek inpatient and outpatient care than people who were not insured. Other factors at the individual level (such as self-perceived health and number of doctor-diagnosed chronic diseases), the family level (such as living arrangements and household expenditures), and the community level (such as the presence of township hospitals within the community) are also significant predictors of health care seeking behaviors. 相似文献
918.
Na Xiu Maria Ignatieva Cecil Konijnendijk van den Bosch Yongyu Chai Fei Wang Tengfei Cui Fengping Yang 《Urban Ecosystems》2017,20(4):729-742
Landscape fragmentation threatens habitats, biodiversity and other ecosystem services. In tackling this threat, the dynamic processes of social-ecological systems should be recognised and understood. Although network analysis based on graph theory has been recognised as an efficient way of spatially understanding landscape or habitat connectivity, only few studies have offered specific approaches or suggestions for integrating detailed social-ecological values into geographical distributions. As a contribution to bridging this gap, this paper introduces a social-ecological network model for the issue of landscape or habitat fragmentation applied to the case of Stockholm, Sweden. Graph theory was used in combination with sociotope and biotope maps for simple visualisation of network situations in two-dimensional maps. The European crested tit (Lophophanes cristatus), European common toad (Bufo bufo) and human beings were selected as indicator species, based on a landscape ecology analysis in Stockholm Municipality in 2009. Slope, land use and human disturbance maps were assessed in order to decide cost values of travelling from node to node. Lease-cost-path accumulation was used to create ideal reference maps of green networks. Three separate maps were then developed for suggesting efficient routes for three indicators in city scale that mainly connect from the Royal National City Park to the other parts of the city. The model in Hjorthagen neighbourhood to highlight two practical paths that link this fragmented community to its neighbouring park areas. Findings make it possible to address two scales of network improvement strategies, namely first for the city-scale green network that connects geographical habitats (nodes) and the regional green wedges of the city, and the second that of neighbourhood links between habitats in detailed layers of green networks. Strategic improvement potentials are presented based on ideal reference maps of green networks correspondingly. 相似文献
919.
The current investigation examined our prediction that sexual objectification decreases women’s experiential consumption but not material consumption. Three experiments provided converging support for this prediction. In particular, female participants reported lower tendency to engage in experiential consumption after recalling a past experience of objectification (Studies 1 and 3) and chose a material product over an experiential one after receiving objectifying comments (Study 2). Furthermore, Study 3 found that sexual objectification reduced purchase inclination of experiential products, and this effect did not emerge for material products. These findings contribute to the literature on sexual objectification by showing the impact of sexual objectification on women’s economic decisions and behaviors. 相似文献
920.
总部经济是国家级新区竞相培育发展的一种新型经济形态,也是衡量新区区域竞争力的重要指标。以国家级新区总部经济扶持政策为研究对象,重点梳理分析了上海浦东、天津滨海、重庆两江等8个国家级新区扶持总部经济发展的具体政策,总结了新区在总部经济发展扶持政策的通行做法和基本规律,并在此基础上提出新区应加强总部经济规划、总部经济中央商务区建设以及加大优惠扶持政策力度等相关对策建议。 相似文献