全文获取类型
收费全文 | 610篇 |
免费 | 42篇 |
专业分类
各国政治 | 39篇 |
工人农民 | 33篇 |
世界政治 | 70篇 |
外交国际关系 | 58篇 |
法律 | 250篇 |
中国政治 | 11篇 |
政治理论 | 187篇 |
综合类 | 4篇 |
出版年
2023年 | 7篇 |
2022年 | 5篇 |
2021年 | 16篇 |
2020年 | 27篇 |
2019年 | 31篇 |
2018年 | 39篇 |
2017年 | 42篇 |
2016年 | 34篇 |
2015年 | 28篇 |
2014年 | 30篇 |
2013年 | 100篇 |
2012年 | 27篇 |
2011年 | 21篇 |
2010年 | 14篇 |
2009年 | 14篇 |
2008年 | 22篇 |
2007年 | 28篇 |
2006年 | 17篇 |
2005年 | 15篇 |
2004年 | 19篇 |
2003年 | 9篇 |
2002年 | 13篇 |
2001年 | 5篇 |
2000年 | 9篇 |
1999年 | 3篇 |
1998年 | 5篇 |
1997年 | 4篇 |
1996年 | 4篇 |
1995年 | 5篇 |
1994年 | 3篇 |
1993年 | 2篇 |
1992年 | 2篇 |
1990年 | 5篇 |
1989年 | 2篇 |
1986年 | 3篇 |
1985年 | 2篇 |
1984年 | 3篇 |
1983年 | 7篇 |
1982年 | 3篇 |
1981年 | 2篇 |
1979年 | 3篇 |
1978年 | 1篇 |
1977年 | 2篇 |
1976年 | 4篇 |
1975年 | 3篇 |
1974年 | 1篇 |
1973年 | 2篇 |
1971年 | 3篇 |
1968年 | 1篇 |
1966年 | 1篇 |
排序方式: 共有652条查询结果,搜索用时 15 毫秒
71.
72.
73.
74.
The human subjects protection committee is the principal legal mechanism for protecting the rights and welfare of human subjects of biomedical and behavioral research. In this article the author explores the influence of variations in the structure of the review process and in the composition and operating procedures of the committees on committee performance. He also assesses revisions in the review process proposed by the National Commission on the Protection of Subjects of Biomedical and Behavioral Research. 相似文献
75.
76.
77.
Much research on adolescent delinquency pivots on the notion of peer influence. The peer effect that is typically employed
emphasizes the transmission of behaviors and attitudes between adolescents who are directly linked. In this paper, we argue
that to rely solely on those direct social ties to capture peer influence oversimplifies the realities of adolescent society.
We use data from the National Longitudinal Study of Adolescent Health to show that indirect peer relations can exercise independent
influences on adolescent delinquency. Adolescents actively draw on the examples of friends of friends, and even more distal
peers, as they develop their repertoires of action and identity. We argue, however, that this behavior actually reflects adolescents’
ongoing struggle to impress their closest friends and to preserve their social circle. Indeed, the extent to which adolescents
are willing to model the behavior of indirect contacts seems to decline as that behavior becomes more dissimilar from that
of their close friends. Our findings dovetail with an account of the adolescent as a rational actor who struggles for social
acceptance in a complex peer environment which offers conflicting behavioral models.
相似文献
Danielle C. PayneEmail: |
78.
79.
80.
The labor force participation rates of men and women aged 62-79 have notably increased since the mid-1990s. The result is a dramatic increase in the share of total money income attributable to earnings. For persons aged 65-69, the earnings share of total income increased from 28 percent in 1980 to 42 percent in 2009. For this age group in the late 1980s and early 1990s, Social Security benefits and earnings were roughly equal shares of total money income (about 30 percent); the earnings share is now more than 12 percentage points larger. When we focus on aged persons who receive Social Security benefits, earnings shares have increased markedly throughout the 62-79 age range since the early 1990s. We show that for aged persons with labor market earnings, those earnings have a large effect on their relative position in the distribution of annual money income of older Americans. 相似文献