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   92042篇
  免费   2934篇
  国内免费   4篇
管理学   12643篇
民族学   540篇
人才学   25篇
人口学   7270篇
丛书文集   526篇
教育普及   2篇
理论方法论   9474篇
现状及发展   1篇
综合类   2176篇
社会学   43374篇
统计学   18949篇
  2023年   505篇
  2021年   569篇
  2020年   1512篇
  2019年   2201篇
  2018年   2119篇
  2017年   3188篇
  2016年   2407篇
  2015年   2059篇
  2014年   2632篇
  2013年   18848篇
  2012年   2443篇
  2011年   2268篇
  2010年   1998篇
  2009年   2195篇
  2008年   2055篇
  2007年   1880篇
  2006年   2125篇
  2005年   2310篇
  2004年   2179篇
  2003年   1921篇
  2002年   2019篇
  2001年   2094篇
  2000年   1887篇
  1999年   1756篇
  1998年   1524篇
  1997年   1396篇
  1996年   1353篇
  1995年   1362篇
  1994年   1332篇
  1993年   1330篇
  1992年   1333篇
  1991年   1267篇
  1990年   1237篇
  1989年   1092篇
  1988年   1181篇
  1987年   1041篇
  1986年   951篇
  1985年   1112篇
  1984年   1179篇
  1983年   1061篇
  1982年   977篇
  1981年   878篇
  1980年   826篇
  1979年   906篇
  1978年   793篇
  1977年   713篇
  1976年   664篇
  1975年   646篇
  1974年   536篇
  1973年   456篇
排序方式: 共有10000条查询结果,搜索用时 740 毫秒
321.
The more things change, the worse they get.Presented April 18, 1991, Duke University, at the Department of Psychiatry's Grand Rounds, this paper condenses, integrates and updates the author's earlier publication. Acknowledgement and thanks for funding and professional sponsorship of the four research studies this paper draws from are selectively due to the Eugene and Agnes E. Meyer Foundation, the Edgar Stern Family Fund, The National Institute for Mental Health, the Baltimore-Washington Institute for Psychoanalysis and the Department of Psychiatry, Children's Hospital National Medical Center.  相似文献   
322.
323.
Firms facing research costs and demand uncertainty may engage in second-sourcing, in which potential suppliers agree to pool production facilities. I show how sellers and buyers both can benefit from the practice. Second-sourcing allows firms to meet a wider range of possible rates of demand and often to supply a given rate of demand at a lower total cost than under non-cooperation. Buyers benefit through a reduced probability of stock-outs and frequently a lower purchase price. Semiconductor industry data are found to be consistent with the paper's predictions.  相似文献   
324.
This paper is concerned with how standard estimation procedures perform in terms of eficiency for non-normal rounded data. Previous research has shown that the loss in eficiency due to rounding normal data is small. However, evidence from the non-normal distribution considered in this paper suggests, if rounding is coarse or the distribution is very skewed the loss in efficiency due to rounding can be considerable.  相似文献   
325.
326.
327.
328.
A number of researchers have recently challenged the long-held notion among criminologists that rape, along with most other violent crimes, is an intraracial crime. Based on analysis of survey data they concluded that black rapists “prefer” or “seek out” white victims and that the likelihood of a black offender selecting a white victim has been increasing during recent years. Data presented here (1977–88 National Crime Surveys) refute the notion that black rapists “prefer” white victims. Moreover these same data fail to support the contention that rapes involving black offenders and white victims have been increasing. According to National Crime Survey estimates, the proportion of black offenders that victimize whites has been declining. An earlier version of this paper was presented at the annual meetings of the American Society of Criminology, November 1991.  相似文献   
329.
This article examines whether asking the vote question beforeparty identification alters the strength of partisanship andits relationship to vote choice. It employs the 1992 BritishElection Survey, which included a random split half-sample experiment,and the 1992–93 American Election Study Panel, where thequestion order for party identification and the vote were changed.The results show that altering the question ordering had verylittle effect in Britain and no significant effect in the UnitedStates. These results are consistent with the notion that partyidentification is one of the more enduring and stable componentsof mass political behavior in both presidential and parliamentarysystems.  相似文献   
330.
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