全文获取类型
收费全文 | 2086篇 |
免费 | 120篇 |
专业分类
管理学 | 225篇 |
民族学 | 16篇 |
人口学 | 173篇 |
丛书文集 | 8篇 |
教育普及 | 1篇 |
理论方法论 | 254篇 |
综合类 | 31篇 |
社会学 | 1318篇 |
统计学 | 180篇 |
出版年
2023年 | 24篇 |
2022年 | 12篇 |
2021年 | 22篇 |
2020年 | 47篇 |
2019年 | 86篇 |
2018年 | 91篇 |
2017年 | 121篇 |
2016年 | 94篇 |
2015年 | 64篇 |
2014年 | 83篇 |
2013年 | 348篇 |
2012年 | 90篇 |
2011年 | 92篇 |
2010年 | 62篇 |
2009年 | 63篇 |
2008年 | 68篇 |
2007年 | 68篇 |
2006年 | 69篇 |
2005年 | 58篇 |
2004年 | 53篇 |
2003年 | 39篇 |
2002年 | 54篇 |
2001年 | 45篇 |
2000年 | 35篇 |
1999年 | 37篇 |
1998年 | 23篇 |
1997年 | 20篇 |
1996年 | 27篇 |
1995年 | 19篇 |
1994年 | 20篇 |
1993年 | 19篇 |
1992年 | 19篇 |
1991年 | 25篇 |
1990年 | 17篇 |
1989年 | 18篇 |
1988年 | 12篇 |
1987年 | 17篇 |
1986年 | 22篇 |
1985年 | 14篇 |
1984年 | 10篇 |
1983年 | 8篇 |
1982年 | 9篇 |
1981年 | 12篇 |
1980年 | 5篇 |
1979年 | 12篇 |
1978年 | 8篇 |
1977年 | 5篇 |
1976年 | 9篇 |
1975年 | 8篇 |
1973年 | 6篇 |
排序方式: 共有2206条查询结果,搜索用时 15 毫秒
71.
72.
73.
This note examines the sensitivity of the basic economic-order-quantity inventory model to lot-size errors when holding costs are assumed to be a strictly increasing (though not necessarily linear) function of average inventory. In particular, we show that the penalty associated with ordering either too much or too little is a function not only of the size of the error but of the shape of the holding-cost curve as well. We demonstrate that, under certain conditions, even relatively small lot-size errors can be extremely costly. 相似文献
74.
75.
Rachel H. Farr Ilyssa Salomon Jazmin L. Brown-Iannuzzi Christia Spears Brown 《Journal of GLBT Family Studies》2019,15(2):127-150
As numbers of families with same-sex parents increase in the United States, children are more likely to encounter diverse family structures. Given that young children can demonstrate in-group bias, prejudicial attitudes, and social exclusion, it is important to understand how children perceive their peers in diverse families. To our knowledge, no studies have assessed elementary-school-age children's attitudes about same-sex parent families. Here, 131 elementary school students (Mage = 7.79 years; 61 girls) viewed images of same-sex (female and male) and other-sex couples with a child and then were asked about their perceptions of these families, particularly the children. Results indicated participants' preferences toward children with other-sex versus same-sex parents. Developmental and practical implications about children's attitudes toward sexual minority parent families are discussed. 相似文献
76.
Potratz Emily J. Brown Joel S. Gallo Travis Anchor Chris Santymire Rachel M. 《Urban Ecosystems》2019,22(5):807-816
Urban Ecosystems - White-tailed deer (Odocoileus virginianus) are becoming increasingly common in urban environments. How they respond to potential changes (i.e. increased human interactions,... 相似文献
77.
Objective: Previous research has established a gap in orgasm frequency between men and women. This study investigates explanations for the gender gap in orgasm. Methods: Crosstab analysis and logistic regression are used to examine the gender gap in orgasms from one Canadian city: Hamilton, Ontario (N = 194). Results: We find a strong association between women’s orgasms and the type of sexual behavior in which partners engage. Women who receive oral sex are more likely to reach orgasm. Conclusion: Sexual practices focused on clitoral stimulation are important to reducing the gender gap in orgasms. 相似文献
78.
Brizzi Francesco Birrell Paul J. Plummer Martyn T. Kirwan Peter Brown Alison E. Delpech Valerie C. Gill O. Noel De Angelis Daniela 《Lifetime data analysis》2019,25(4):757-780
Lifetime Data Analysis - CD4-based multi-state back-calculation methods are key for monitoring the HIV epidemic, providing estimates of HIV incidence and diagnosis rates by disentangling their... 相似文献
79.
Cameron C. Brown Zenova Williams Jared A. Durtschi 《Journal of marital and family therapy》2019,45(4):650-667
Minimal research has examined interracial couples’ relationship satisfaction and dissolution patterns over time. Using dyadic data across 8 years, we examined potential differences in relationship quality trajectories through latent growth curve modeling with 1,336 couples as well as differential risks for relationship dissolution through logistic regression between same‐race and interracial relationships using a different subset of 2,370 couples. Results indicated that women in interracial relationships were significantly lower in initial relationship quality than women in same‐race relationships. Further, interracial couples of Black‐Hispanic partnerings were twice as likely to separate across 8 years than same‐race couples. These results suggest that despite interracial relationships not substantively differing from same‐race couples in trajectories of relationship quality, specific Black‐Hispanic interracial couples are at a higher risk of eventual separation. 相似文献
80.