全文获取类型
收费全文 | 1819篇 |
免费 | 44篇 |
专业分类
管理学 | 143篇 |
民族学 | 11篇 |
人口学 | 210篇 |
丛书文集 | 4篇 |
理论方法论 | 248篇 |
综合类 | 16篇 |
社会学 | 1099篇 |
统计学 | 132篇 |
出版年
2024年 | 3篇 |
2023年 | 10篇 |
2022年 | 7篇 |
2021年 | 11篇 |
2020年 | 37篇 |
2019年 | 43篇 |
2018年 | 53篇 |
2017年 | 70篇 |
2016年 | 61篇 |
2015年 | 37篇 |
2014年 | 54篇 |
2013年 | 306篇 |
2012年 | 67篇 |
2011年 | 86篇 |
2010年 | 49篇 |
2009年 | 43篇 |
2008年 | 67篇 |
2007年 | 64篇 |
2006年 | 76篇 |
2005年 | 60篇 |
2004年 | 68篇 |
2003年 | 59篇 |
2002年 | 68篇 |
2001年 | 46篇 |
2000年 | 54篇 |
1999年 | 34篇 |
1998年 | 32篇 |
1997年 | 25篇 |
1996年 | 19篇 |
1995年 | 19篇 |
1994年 | 31篇 |
1993年 | 19篇 |
1992年 | 22篇 |
1991年 | 13篇 |
1990年 | 15篇 |
1989年 | 14篇 |
1988年 | 10篇 |
1987年 | 11篇 |
1986年 | 10篇 |
1985年 | 15篇 |
1984年 | 18篇 |
1983年 | 10篇 |
1982年 | 6篇 |
1981年 | 3篇 |
1980年 | 9篇 |
1979年 | 6篇 |
1978年 | 5篇 |
1977年 | 3篇 |
1975年 | 3篇 |
1971年 | 3篇 |
排序方式: 共有1863条查询结果,搜索用时 15 毫秒
141.
Even before the 1996 overhaul of the U.S. welfare system, a number of states had ended the practice of paying extra benefits to families who have additional children while receiving welfare. Proponents believe that this reform can reduce births to recipients, however many worry that it may encourage women to obtain abortions. Using a sample of unmarried AFDC recipients from the NLSY, we estimate a bivariate probit model of pregnancy and, conditional on becoming pregnant, the probability of abortion. Our results lend some support for the proposition that reducing incremental AFDC benefits will decrease pregnancies without increasing abortions. Received: 16 April 1998/Accepted: 11 March 1999 相似文献
142.
143.
Helen McLachlan Della Forster Michelle Newton Pamela McCalman Sue Kildea Fiona McLardie-Hore Gina Bundle Jennifer Browne Marika Jackomos Jacqueline Watkins Simone Andy Jeremy Oats Catherine Chamberlain Jane Freemantle Sue Jacobs Ngaree Blow Karyn Ferguson Susan Donath Helena Maher 《Women and birth : journal of the Australian College of Midwives》2018
144.
145.
The purpose of this paper is to examine the relative importance of access to family planning and the motivation to restrict fertility in determining contraceptive use in three countries that have led the fertility transitions in their regions: Colombia, Tunisia, and Zimbabwe. A structural equations model is estimated where endogenous fertility intentions are allowed to affect contraceptive method use. Simulation methods are then used to quantify the size of the impact of intentions and access on method choice for the three countries. The results demonstrate that even after controlling for fertility intentions, family planning program variables still have important effects in all three countries. 相似文献
146.
John Bongaarts Susan Greenhalgh Geoffrey McNicoll Michael P. Todaro Etienne van de Walk Zachary Zimmer 《Population and development review》2001,27(3):608-617
Books reviewed in this article: Gay Becker, The Elusive Embryo: How Women and Men Approach New Reproductive Technologies Theodore Caplow, Louis Hicks, and Ben J. Wattenberg, The First Measured Century: An Illustrated Guide to Trends in America, 1900–2000 Stephen Moore and Julian L. Simon, It's Getting Better All the Time: 100 Greatest Trends of the Last 100 Years Elisabeth Croll, Endangered Daughters: Discrimination and Development in Asia Barbara Entwisle and Gail E. Henderson (Eds.), Re‐Drawing Boundaries: Work, Households, and Gender in China David T. Graham and Nana K. Poku (Eds.), Migration, Globalisation and Human Security Paul Harrison and Fred Pearce, AAAS Atlas of Population and Environment Russell King, Paolo De Mas, and Jan Mansvelt Beck (Eds.), Geography, Environment and Development in the Mediterranean Michael T. Klare, Resource Wars: The New Landscape of Global Conflict Korea Institute for Health and Social Affairs and United Nations Population Fund, Low Fertility and Policy Responses to Issues of Ageing and Welfare National Assessment Synthesis Team, Climate Change Impacts on the United States: The Potential Consequences of Climate Variability and Change. Report for the US Global Change Research Program Jacques Vaixin and Thérèse Locoh (Eds.), Population et développement en Tunisie: La métamorphose 相似文献
147.
Elizabeth Thomson Trude Lappegård Marcia Carlson Ann Evans Edith Gray 《Demography》2014,51(2):485-508
This article compares mothers’ experience of having children with more than one partner in two liberal welfare regimes (the United States and Australia) and two social democratic regimes (Sweden and Norway). We use survey-based union and birth histories in Australia and the United States and data from national population registers in Norway and Sweden to estimate the likelihood of experiencing childbearing across partnerships at any point in the childbearing career. We find that births with new partners constitute a substantial proportion of all births in each country we study. Despite quite different arrangements for social welfare, the determinants of childbearing across partnerships are very similar. Women who had their first birth at a very young age or who are less well-educated are most likely to have children with different partners. The educational gradient in childbearing across partnerships is also consistently negative across countries, particularly in contrast to educational gradients in childbearing with the same partner. The risk of childbearing across partnerships increased dramatically in all countries from the 1980s to the 2000s, and educational differences also increased, again, in both liberal and social democratic welfare regimes. 相似文献
148.
Regina Bures Rebecca Clark Rosalind King Susan Newcomer 《Population research and policy review》2014,33(1):1-11
The purpose of this article is to briefly describe the application and funding process at the National Institutes of Health (NIH). We target our discussion to demographic and population science at the Eunice Kennedy Shriver National Institute of Child Health & Human Development (NICHD), but the general strategies are applicable to social and behavioral scientists for all NIH funding opportunities. 相似文献
149.
This study investigated the relationships between types of activity and quality of life (QOL) for older men and women at different ages. Based on cross-sectional data that included 220 community-dwelling elderly persons aged 65 and older in southern Taiwan, the results showed that the participation rates in many activities declined with age for both genders. Social activity and solitary leisure activity were significantly associated with QOL for old-old men, but not for young-old men. Only social activity was significantly associated with QOL for young-old women, but there was no significant association between any activity and QOL for old-old women. 相似文献
150.