首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   91193篇
  免费   1958篇
  国内免费   3篇
管理学   12359篇
民族学   531篇
人才学   25篇
人口学   6947篇
丛书文集   525篇
教育普及   2篇
理论方法论   9397篇
综合类   2124篇
社会学   42478篇
统计学   18766篇
  2023年   513篇
  2021年   571篇
  2020年   1498篇
  2019年   2205篇
  2018年   2056篇
  2017年   3136篇
  2016年   2358篇
  2015年   2040篇
  2014年   2617篇
  2013年   18826篇
  2012年   2335篇
  2011年   2115篇
  2010年   1924篇
  2009年   2172篇
  2008年   2007篇
  2007年   1833篇
  2006年   2041篇
  2005年   2295篇
  2004年   2190篇
  2003年   1859篇
  2002年   1969篇
  2001年   2014篇
  2000年   1791篇
  1999年   1709篇
  1998年   1496篇
  1997年   1350篇
  1996年   1317篇
  1995年   1333篇
  1994年   1309篇
  1993年   1286篇
  1992年   1294篇
  1991年   1228篇
  1990年   1206篇
  1989年   1054篇
  1988年   1133篇
  1987年   1007篇
  1986年   911篇
  1985年   1065篇
  1984年   1156篇
  1983年   1028篇
  1982年   958篇
  1981年   864篇
  1980年   819篇
  1979年   888篇
  1978年   782篇
  1977年   701篇
  1976年   656篇
  1975年   634篇
  1974年   529篇
  1973年   455篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
901.
In this paper the timing of maternity is estimated by a hazard model. The novel aspect of this paper is that it is shown that wages and total household labor income have a significant effect on the timing of maternity. Both the wage rate of the woman and the wage rate of the husband have a negative effect on the timing of maternity. Total household labor income increases the probability of having a child at an earlier age. Calculated elasticities show that the timing of maternity is relatively elastic with respect to wage rates. However, the elasticities of the decision whether or not to have children altogether are much smaller. Women working in the labor market delay the timing of maternity compared to non-participating women. Attending school has the same effect. Until the age of 28 the maternity hazard increases with age, after that it decreases.We benefited from comments on previous drafts by Siv Gustafsson, Joop Hartog, Peter Kee, Herriette Maassen van den Brink, Eddie Mekkelholt, Joop Odink, Hessel Oosterbeek, Hans van Ophem, Gusta Renes, Andre Voskamp, two anonymous referees, and the Managing Editor of this Journal. This paper is a revised version of a paper presented at the third annual meeting of the European Society for Population Economics, Paris, June 1989. The usual disclaimer applies.  相似文献   
902.
Elective single mothers are adult, unmarried women who intentionally become mothers. This study utilized longitudinal data about 17 Caucasian, elective single mothers and their children to identify fathers' roles in these families, and to understand children's views of their fathers. These single mothers and their children resided for the first six years of the children's lives in father-absent households. By age six, most of the children had ghost fathers, whom they had never met or knew little about. The data suggest that the father often becomes a family secret, and that children may blame themselves for their fathers' absence.  相似文献   
903.
904.
905.
A paradox currently exists regarding legal sports gambling in North America: various forms are flourishing in Nevada, Oregon, and several Canadian provinces, while at the same time the United States Congress is conducting hearings on two bills that would prohibit any new state-sponsored sports gambling initiatives. This study examines the issue of why some jurisdictions are enthusiastic about legal sports gambling while others strongly resist the concept. In reviewing these divergent viewpoints, a case study of the newfledged Canadian Sport Select gambling format is presented. This example is used to highly the perils and payoffs of a typical state-sponsored sports gambling scheme, with a view toward broadening our understanding of how they work and how they might be fairer to the public.  相似文献   
906.
907.
908.
"A survey is given of the use of modern statistical techniques in event history analysis, and in particular in the study of multi-state life-tables in demography. Emphasis is placed on the interplay between partial likelihood and nonparametric maximum likelihood based methods, a) when analysing semi-Markov models or models with repeated spells, and b) in frailty models for unobservable heterogeneity."  相似文献   
909.
910.
College newspapers are a powerful but underutilized medium for educating students on health issues, including those related to drug and alcohol use on campus. Editors of these publications are in a position to wield significant influence among their readers. In addition to communicating factual information about the prevalence and impact of substance use among college students, editors can use the press to advocate changes in students' attitudes and behaviors and in college or community policies that affect substance use. A pilot conference was held to help New England college newspaper editors perceive the importance of their role in educating their peers about substance use and other health-related issues, and to offer concrete suggestions as to how they can incorporate these topics into an "activist" campus press.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号