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   19991篇
  免费   367篇
  国内免费   1篇
管理学   2878篇
民族学   74篇
人才学   1篇
人口学   1922篇
丛书文集   79篇
教育普及   2篇
理论方法论   1834篇
现状及发展   1篇
综合类   262篇
社会学   9679篇
统计学   3627篇
  2021年   120篇
  2020年   295篇
  2019年   404篇
  2018年   462篇
  2017年   638篇
  2016年   494篇
  2015年   372篇
  2014年   481篇
  2013年   3100篇
  2012年   664篇
  2011年   637篇
  2010年   473篇
  2009年   396篇
  2008年   485篇
  2007年   488篇
  2006年   490篇
  2005年   465篇
  2004年   422篇
  2003年   391篇
  2002年   439篇
  2001年   534篇
  2000年   543篇
  1999年   471篇
  1998年   349篇
  1997年   321篇
  1996年   334篇
  1995年   309篇
  1994年   296篇
  1993年   294篇
  1992年   347篇
  1991年   320篇
  1990年   290篇
  1989年   295篇
  1988年   291篇
  1987年   251篇
  1986年   249篇
  1985年   284篇
  1984年   267篇
  1983年   250篇
  1982年   216篇
  1981年   185篇
  1980年   167篇
  1979年   194篇
  1978年   177篇
  1977年   159篇
  1976年   134篇
  1975年   157篇
  1974年   119篇
  1973年   115篇
  1972年   93篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
42.
43.
44.
Banks winners in tournaments are difficult to recognize   总被引:1,自引:0,他引:1  
Given a tournament T, a Banks winner of T is the top vertex of any maximal (with respect to inclusion) transitive subtournament of T. In this technical note, we show that the problem of deciding whether some fixed vertex v is a Banks winner for T is NP-complete. Received: 22 February 2002/Accepted: 20 June 2002 Supported by the START program Y43-MAT of the Austrian Ministry of Science. I would like to thank two thank the referees for a careful reading of the paper, for helpful remarks, and for many suggestions how to improve the presentation.  相似文献   
45.
Using an experimental design, this research examines the effect of the nation's first family cap on the births, abortions, and contraception use of over 8,000 women receiving public assistance in New Jersey. The family cap denies additional cash benefits to children conceived while the mother is receiving public assistance. Our research shows that a targeted welfare benefit manipulation does influence fertility behavior; however, the effect is conditioned by race. We find that Black women in the experimental group have a 21% lower birth rate and a 32% higher abortion rate than Black women in the control group. We do not find a birth effect for Hispanic or White women. We discuss the policy implications of the effects of a segmented family cap.  相似文献   
46.
This article aims to bring gender into an even tighter transnational migration focus by broadening and deepening our original framework of “gendered geographies of power,” linking it more directly to existing and emerging scholarship. We examine and highlight previously neglected areas such as the role of the state and the social imaginary in gendering transnational processes and experiences. We identify topics that remain under‐appreciated, under‐researched, and/or under‐theorized. Finally, we initiate a discussion of how a gendered analysis of transnational migration can help bridge this particular research to other gendered transnational processes under study that do not privilege migration.  相似文献   
47.
This paper proposes a developmental framework for foster parents and outlines four distinct growth stages. Such a framework can be of value to program administrators who are required to assess foster parent development during the crucial matching process. To draw a distinction between each developmental stage, specific instrumental tasks and indicators are outlined.  相似文献   
48.
Determining the size and demographiccharacteristics of substance abuse populationsis extremely important for implementing publicpolicies aimed at the control of substanceabuse. Such information not only assists in theallocation of limited treatment resources bythe state, but also in the monitoring ofsubstance abuse trends over time and in theevaluation of innovative policy initiatives. Inthis study, we develop three composite measuresof treatment need. We then use these measuresto estimate treatment need for alcohol abuseand for controlled substance abuse within eachof Florida's 67 counties. This study providesan important empirical component of communityplanning, quantifying and, to a limited degree,specifying the level of need for the substanceabuse treatment of community residents. Anadditional benefit is the development of a costeffective and unobtrusive methodology fordetermining empirically when levels of need arechanging so that treatment levels can beadjusted accordingly. With proper use,policymakers can readily employ the methodologydeveloped in this study in Florida andelsewhere to make better-informed decisions inthe allocation of finite substance abusetreatment resources.  相似文献   
49.
A comprehensive set of variables that have been supported as contributing to overall health and general well-being were analyzed to determine their simple structure using factor analysis and their relative contribution using Pearson correlation. The contributors to general well-being had been theoretically grouped into: emotions, beliefs, temperaments, behaviors, sittuations, experiences and health. The empirical factor structure was compared with the theoretical structure used to develop the variables. Stability was investigated by comparing results with those of another geographically separated group. All subjects were normally functioning working adults. The results demonstrated the feasibility and potential usefulness of using self-report questionnaires with multivariate procedures to measure components of the global general well-being concept.  相似文献   
50.
Despite high expectations, students of the 1960 and 1976 presidentialdebates were unable to find much evidence that these eventssignificantly affected voters' candidate preferences. As a result,scholars have turned increasingly to cognitive consistency theoriesto explain viewers' reactions (Or nonreactions) to debates.This article argues that one key mediating variable determiningwhether or not voters are influenced by debates is their levelof political knowledge. Looking at the largely ignored 1980Carter-Reagan debate, we find that voters with generally lowlevels of knowledge are particularly affected by the debate,and significant shifts in candidate preferences do occur amongthis group. The evidence suggests that the debate was an importantfactor in Ronald Reagan's bid to unseat his Democratic opponent.  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