全文获取类型
收费全文 | 677篇 |
免费 | 36篇 |
专业分类
管理学 | 41篇 |
民族学 | 4篇 |
人才学 | 1篇 |
人口学 | 102篇 |
丛书文集 | 2篇 |
理论方法论 | 126篇 |
综合类 | 2篇 |
社会学 | 395篇 |
统计学 | 40篇 |
出版年
2023年 | 4篇 |
2021年 | 5篇 |
2020年 | 10篇 |
2019年 | 21篇 |
2018年 | 32篇 |
2017年 | 25篇 |
2016年 | 32篇 |
2015年 | 17篇 |
2014年 | 38篇 |
2013年 | 157篇 |
2012年 | 19篇 |
2011年 | 40篇 |
2010年 | 27篇 |
2009年 | 19篇 |
2008年 | 23篇 |
2007年 | 22篇 |
2006年 | 16篇 |
2005年 | 16篇 |
2004年 | 16篇 |
2003年 | 9篇 |
2002年 | 20篇 |
2001年 | 8篇 |
2000年 | 9篇 |
1999年 | 8篇 |
1998年 | 12篇 |
1997年 | 3篇 |
1996年 | 9篇 |
1995年 | 7篇 |
1994年 | 8篇 |
1993年 | 10篇 |
1992年 | 11篇 |
1991年 | 6篇 |
1990年 | 3篇 |
1989年 | 5篇 |
1988年 | 2篇 |
1987年 | 4篇 |
1985年 | 3篇 |
1984年 | 5篇 |
1983年 | 5篇 |
1981年 | 3篇 |
1980年 | 4篇 |
1979年 | 2篇 |
1978年 | 3篇 |
1977年 | 3篇 |
1976年 | 2篇 |
1975年 | 3篇 |
1974年 | 2篇 |
1973年 | 1篇 |
1972年 | 2篇 |
1969年 | 1篇 |
排序方式: 共有713条查询结果,搜索用时 828 毫秒
81.
82.
83.
Team play: Heedful interrelating as the boundary for innovation 总被引:1,自引:0,他引:1
84.
85.
86.
87.
The current approach to health risk assessment of toxic waste sites in the U.S. may lead to considerable expenditure of resources without any meaningful reduction in population exposure. Risk assessment methods used generally ignore background exposures and consider only incremental risk estimates for maximally exposed individuals. Such risk estimates do not address true public health risks to which background exposures also contribute. The purpose of this paper is to recommend a new approach to risk assessment and risk management concerning toxic waste sites. Under this new approach, which we have called public health risk assessment, chemical substances would be classified into a level of concern based on the potential health risks associated with typical national and regional background exposures. Site assessment would then be based on the level of concern for the particular pollutants involved and the potential contribution of site contaminants to typical background human exposures. While various problems can be foreseen with this approach, the key advantage is that resources would be allocated to reduce the most important sources of human exposure, and site remediation decisions could be simplified by focussing on exposure assessment rather than questionable risk extrapolations. 相似文献
88.
Previous studies have failed to examine (a) the simultaneity of decisions to bear children and to dissolve a marriage and (b) the effects of the childbearing in the period just before dissolution on the likelihood of disruption. We attempted to resolve both problems by developing a simultaneous logit model of the interrelationship between the probability of separation and of having a birth during this period (when dissolution presumably is being considered). The model was estimated at successive durations of first marriage, using data for white women in the 1970 National Fertility Survey. The results indicate that childbearing patterns— number of children and age of youngest child at the beginning of the marital interval being studied and fertility during the interval—did not influence the likelihood of separation in simple or consistent ways over the marital life course, nor did marital strife (as indicated by separation) seem to affect childbearing throughout marriage. 相似文献
89.
90.