全文获取类型
收费全文 | 9066篇 |
免费 | 142篇 |
国内免费 | 1篇 |
专业分类
管理学 | 1177篇 |
民族学 | 50篇 |
人口学 | 955篇 |
丛书文集 | 39篇 |
理论方法论 | 782篇 |
综合类 | 113篇 |
社会学 | 4324篇 |
统计学 | 1769篇 |
出版年
2023年 | 53篇 |
2020年 | 125篇 |
2019年 | 190篇 |
2018年 | 232篇 |
2017年 | 335篇 |
2016年 | 265篇 |
2015年 | 167篇 |
2014年 | 213篇 |
2013年 | 1615篇 |
2012年 | 273篇 |
2011年 | 253篇 |
2010年 | 185篇 |
2009年 | 159篇 |
2008年 | 178篇 |
2007年 | 184篇 |
2006年 | 193篇 |
2005年 | 177篇 |
2004年 | 177篇 |
2003年 | 154篇 |
2002年 | 183篇 |
2001年 | 199篇 |
2000年 | 193篇 |
1999年 | 200篇 |
1998年 | 159篇 |
1997年 | 148篇 |
1996年 | 138篇 |
1995年 | 128篇 |
1994年 | 124篇 |
1993年 | 126篇 |
1992年 | 138篇 |
1991年 | 151篇 |
1990年 | 138篇 |
1989年 | 158篇 |
1988年 | 111篇 |
1987年 | 129篇 |
1986年 | 108篇 |
1985年 | 126篇 |
1984年 | 106篇 |
1983年 | 116篇 |
1982年 | 93篇 |
1981年 | 96篇 |
1980年 | 83篇 |
1979年 | 94篇 |
1978年 | 103篇 |
1977年 | 75篇 |
1976年 | 79篇 |
1975年 | 76篇 |
1974年 | 69篇 |
1973年 | 55篇 |
1971年 | 49篇 |
排序方式: 共有9209条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
Mark S. Pearce Heather O. Dickinson Murray Aitkin Louise Parker 《Journal of the Royal Statistical Society. Series A, (Statistics in Society)》2002,165(3):523-548
Summary. This study investigates whether there was evidence of increasing risk of still-birth with increasing paternal exposure to ionizing radiation received during employment at the Sellafield nuclear installation before the child was conceived. A significant positive association is found between the total paternal preconceptional exposure to external ionizing radiation and the risk of still-birth (after adjustment for year of birth, social class, birth order and paternal age, odds ratio at 100 mSv 1.24 (95% confidence interval 1.04–1.45)). A summary of the principal scientific findings of this study has been published in the Lancet . This paper describes in detail the statistical methods that were used in the investigation and presents the results in full. 相似文献
5.
Diane Hope Weixing Zhu Corinna Gries Jacob Oleson Jason Kaye Nancy B. Grimm Lawrence A. Baker 《Urban Ecosystems》2005,8(3-4):251-273
We explored variations in inorganic soil nitrogen (N) concentrations across metropolitan Phoenix, Arizona, and the surrounding
desert using a probability-based synoptic survey. Data were examined using spatial statistics on the entire region, as well
as for the desert and urban sites separately. Concentrations of both NO3-N and NH4-N were markedly higher and more heterogeneous amongst urban compared to desert soils. Regional variation in soil NO3-N concentration was best explained by latitude, land use history, population density, along with percent cover of impervious
surfaces and lawn, whereas soil NH4-N concentrations were related to only latitude and population density. Within the urban area, patterns in both soil NO3-N and NH4-N were best predicted by elevation, population density and type of irrigation in the surrounding neighborhood. Spatial autocorrelation
of soil NO3-N concentrations explained 49% of variation among desert sites but was absent between urban sites. We suggest that inorganic
soil N concentrations are controlled by a number of ‘local’ or ‘neighborhood’ human-related drivers in the city, rather than
factors related to an urban-rural gradient. 相似文献
6.
The Coase theorem maintains that where free-market precepts exist, the allocation of property rights does not impact the distribution of resources. An application to Major League Baseball suggests that institutions such as free agency and the reverse-order amateur draft would not impact player distributions and therefore would not impact competitive balance. The present study finds that the distribution of wins is generally consistent with the precepts of the Coase theorem and therefore suggests a course for those who wish to alter the level of competitive balance: Major League Baseball should increase its focus on expanding the size of its labor pool. (JEL O15 , L83 , C22 ) 相似文献
7.
UNDERSTANDING THE DECISION TO PARTICIPATE IN A SURVEY 总被引:18,自引:1,他引:17
The lack of full participation in sample surveys threatens theinferential value of the survey method. We review a set of conceptualdevelopments and experimental findings that appear to be informativeabout causes of survey participation; offer an integration ofthat work with findings from the more traditional statisticaland survey methodological literature on nonresponse; and, giventhe theoretical structure, deduce potentially promising pathsof research toward the understanding of survey participation. 相似文献
8.
9.
This study examines the influence of the socialization of aggression among different gender and social class groupings and the influence of psychosocial stage on cognitive developmental play preferences among groups of school aged children. Observations of 143 play groups were coded for play preference (symbolic play, practice play, games with rules) and play performance (cooperative or competitive). Findings of the log-linear data analysis suggest a middle class and masculine bias in Piaget's cognitive model (i.e., that as age increases children prefer more games with rules). This model held only for middle class and affluent boys. Girls (both latency and prepubertal) and lower socioeconomic groups tended to prefer practice play. Girls were more likely to play cooperatively; boys more likely to play competitively. Implications for theory development and clinical practice are explored. 相似文献
10.
We employ vector autoregressive techniques to determine the current state of the labor queue. Unemployment rate differentials
have narrowed in recent years, potentially due to a change in the queue ordering, though a tight labor market and a stable
queue would yield similar results. We find no evidence that the queue ordering has changed, which brings into question the
resiliency of gains made by minority groups. We employ the same techniques to reveal the state of the queue across geographic
regions and find that substantial differences exist across regions, implying variation in the relative labor force status
of demographic groups. 相似文献