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   91591篇
  免费   2955篇
  国内免费   3篇
管理学   12632篇
民族学   540篇
人才学   25篇
人口学   7199篇
丛书文集   523篇
教育普及   3篇
理论方法论   9467篇
综合类   2161篇
社会学   42952篇
统计学   19047篇
  2023年   516篇
  2021年   581篇
  2020年   1523篇
  2019年   2236篇
  2018年   2131篇
  2017年   3199篇
  2016年   2400篇
  2015年   2055篇
  2014年   2646篇
  2013年   18893篇
  2012年   2422篇
  2011年   2241篇
  2010年   1991篇
  2009年   2208篇
  2008年   2055篇
  2007年   1874篇
  2006年   2098篇
  2005年   2288篇
  2004年   2160篇
  2003年   1898篇
  2002年   1999篇
  2001年   2045篇
  2000年   1839篇
  1999年   1743篇
  1998年   1510篇
  1997年   1363篇
  1996年   1339篇
  1995年   1352篇
  1994年   1320篇
  1993年   1309篇
  1992年   1327篇
  1991年   1235篇
  1990年   1217篇
  1989年   1086篇
  1988年   1141篇
  1987年   1032篇
  1986年   930篇
  1985年   1097篇
  1984年   1165篇
  1983年   1043篇
  1982年   954篇
  1981年   876篇
  1980年   830篇
  1979年   900篇
  1978年   796篇
  1977年   710篇
  1976年   672篇
  1975年   652篇
  1974年   532篇
  1973年   451篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
301.
302.
VII. Conclusion The number of immigrants now coming to the United States is proportionally only a fraction of the number that came in earlier years, and there is nothing in those numbers to suggest a difficult absorption burden. Immigrants, both legal and illegal, more than pay for the services they use with the taxes they pay, leaving a considerable net surplus that benefits American citizens. Immigrants raise productivity and do not cause an observable amount of unemployment of citizens. Admitting far more immigrants into the country than the law now allows would have positive effects on the incomes of citizens, and would enhance the continuing vitality of the United States.  相似文献   
303.
UNDERSTANDING THE DECISION TO PARTICIPATE IN A SURVEY   总被引:18,自引:1,他引:17  
The lack of full participation in sample surveys threatens theinferential value of the survey method. We review a set of conceptualdevelopments and experimental findings that appear to be informativeabout causes of survey participation; offer an integration ofthat work with findings from the more traditional statisticaland survey methodological literature on nonresponse; and, giventhe theoretical structure, deduce potentially promising pathsof research toward the understanding of survey participation.  相似文献   
304.
In our zeal to deal with alcohol and drug abuse, we may have a distorted picture of what the majority of college students actually think about alcohol and drug use. Students in this study done at a public university located in the Deep South report being generally intolerant of substance abuse.  相似文献   
305.
306.
307.
The study reported describes Efe (pygmy) forager one-, two-, and three-year-olds' involvement with males. The Efe of northeastern Zaïre were chosen because their social organization allows us to examine hypotheses based on studies in Western, technologically complex societies about the distinctive role fathers play in the lives of their young children. Behavioral observations of Efe children's day-to-day activities with fathers, men and boys were recorded using a focal subject sampling technique (Altmann, 1974). Two behavioral measures were created to capture the extent to which males were involved with children: Social engagement describes males' involvement with children and social attention describes eavesdropping by children on males' everyday activities. Eight one-year-olds, 7 two-year-olds and 8 three-year-olds were each observed for six, one-hour observation sessions that were distributed evenly over the daylight hours. Data were analyzed using the traditional measure of involvement (e.g., adult males) and using a newly developed measure of the involvement of the average individual (e.g., average adult mate). Comparisons at each of the ages showed that fathers were consistently like other men in the extent to which children participated in social activities with them and watched their activities. Only fathers' level of social engagement declined significantly as children grew older. Boys' role relative to other males became increasingly distinctive as children aged. The findings suggest that Efe fathers may not be unique in the same sense assumed by Western study ideals, and raise questions about the special status given to fathers in Western theory and data. The patterning of mate involvement with children is discussed in terms of Efe community life, and in terms of Efe children's developing understanding of their relationship with fathers and other males.  相似文献   
308.
309.
This paper discusses some uses in econometrics of empirical process theory for dependent rendom variables. Examples considered include non-standard parametric hypotheses tests and semiparametric estimation. The application of bracketing functional limit results is discussed in some detail  相似文献   
310.
I test the hypothesis that the growth of autonomy was the factor responsible for the decline of marital fertility in eight Eastern European countries. By growth of autonomy I mean increased control over one's political, personal, religious, economic and reproductive life. This increased control was manifested in revolutions, democratic political reforms, nationalist movements and declining marital fertility. The political reforms were the result of the growth of autonomy but they also accelerated the dissemination of these new ideas among the populace contributing to further growth of autonomy. My hypothesis is generally supported by the historical data.  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