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   34929篇
  免费   626篇
  国内免费   1篇
管理学   4558篇
民族学   163篇
人才学   7篇
人口学   3342篇
丛书文集   178篇
教育普及   3篇
理论方法论   3207篇
现状及发展   2篇
综合类   472篇
社会学   17081篇
统计学   6543篇
  2023年   157篇
  2021年   192篇
  2020年   512篇
  2019年   765篇
  2018年   834篇
  2017年   1143篇
  2016年   851篇
  2015年   652篇
  2014年   828篇
  2013年   5650篇
  2012年   1166篇
  2011年   1093篇
  2010年   836篇
  2009年   752篇
  2008年   863篇
  2007年   904篇
  2006年   839篇
  2005年   798篇
  2004年   767篇
  2003年   696篇
  2002年   744篇
  2001年   893篇
  2000年   836篇
  1999年   768篇
  1998年   592篇
  1997年   544篇
  1996年   554篇
  1995年   527篇
  1994年   504篇
  1993年   498篇
  1992年   578篇
  1991年   561篇
  1990年   495篇
  1989年   508篇
  1988年   493篇
  1987年   440篇
  1986年   427篇
  1985年   478篇
  1984年   475篇
  1983年   448篇
  1982年   367篇
  1981年   316篇
  1980年   313篇
  1979年   339篇
  1978年   296篇
  1977年   277篇
  1976年   243篇
  1975年   258篇
  1974年   200篇
  1973年   178篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
The authors maintain that the social learning theory of career development and counseling has not been applied to diverse populations. To address this gap in the literature, the authors conducted a qualitative analysis of interviews with 21 middle school students in a low‐income, culturally diverse, inner‐city public school. Four themes emerged, reflecting the influence of discrimination on participants' career learning: contextual barriers and resources for learning, and psychological barriers and resources for learning. The authors provide a conceptual framework for assessing resources and barriers and a rationale for why these aspects often remain hidden or unexamined in career assessment with clients who are vulnerable to discrimination.  相似文献   
2.
3.
The product of two independent or dependent scalar normal variables, sums of products, sample covariances, and general bilinear forms are considered. Their distributions are shown to belong to a class called generalized Laplacian. A growth-decay mechanism is also shown to produce such a generalized Laplacian. Sets of necessary and sufficient conditions are derived for bilinear forms to belong to this class. As a generalization, the distributions of rectangular matrices associated with multivariate normal random vectors are also discussed.  相似文献   
4.
5.
Athletics is the most prominent extracurricular activity in U.S. secondary schools in terms of student participation and school budgets. The latter is often justified on the grounds that healthy bodies produce healthy minds, that school sports boost school spirit, and that participation in school-based sports increases students' self-esteem. In this article we examine the interrelationships among participation in a school-based sport and the benefits assumed to be associated with it. Specifically, we test a model that postulates that school spirit, operationalized as attachment to school, and healthy bodies, operationalized as a sense of physical well-being, mediate the relationship between school sports and self-esteem. Data from the National Longitudinal Study of Adolescent Health on Caucasian and African American girls and boys were employed to test the model. School attachment and physical well-being absorbed the statistical effect of participating in a sport for all four gender-by-race groups. Among Caucasian girls a negative residual effect of sports participation was observed, which suggests that sports participation encapsulates multiple effects with contradictory influences. For African American girls school attachment by itself was not a significant mediator of the effect of sports participation on self-esteem. For all groups a sense of physical well-being was the more powerful mediator.  相似文献   
6.
7.
Concurrent and longitudinal associations between peer crowd affiliation and internalized distress were examined in a sample of 246 youth (148 girls, 98 boys). Children completed measures of depression, social anxiety, loneliness, and self‐esteem when they were in grades 4 to 6 (Time 1), and again 6 years later during adolescence (grades 10 – 12; Time 2). At Time 2, adolescents also reported their self‐concept and their identification with reputation‐based peer crowds, including Populars, Jocks, Brains, Burnouts, Non‐Conformists, and None/Average crowds. Results indicated that adolescents' report of peer crowd affiliation was concurrently associated with self‐concept and levels of internalizing distress. Follow‐back analyses of internalizing trajectories revealed that Populars/Jocks had experienced significant declines in internalizing distress across development, whereas Brains exhibited some increases in internalizing distress between childhood and adolescence.  相似文献   
8.
The hypothesis that irritability and contingency detection are negatively correlated was examined in thirty‐one 6‐month‐old infants. Observation and maternal report‐based assessments of irritability were correlated with both a criterion score and a continuous score of contingency detection. Results indicated that greater irritability in infants was associated with lower contingency detection scores. Discussion focuses on identifying processes by which the 2 constructs may be associated.  相似文献   
9.
10.
A normal vote is a hypothetical election result following exclusively from predispositions of voters towards political parties which result from long-term or middle-term influences. The influence of short-term factors like attractive candidates or issues from the recent campaign have to be eliminated within the abstract model. As an operationalization for German Bundestag elections for this purpose the average vote intentions of population groups are used which are part of the politicized German social structures such as catholics, especially when they attend church frequently, or employees (Arbeitnehmer) and union members who have formed enduring coalitions with a political party. This operationalization is compared with a model originally developed for the United States. According to this model, the long-term factor is measured by party identification. All Bundestag elections of the Kohl era are analyzed, for which the Politbarometer surveys of the Forschungsgruppe Wahlen, Mannheim, immediately before the Bundestag elections are used as a data basis. The vote intentions which can be derived from the politicized social structure are shown to be a stabile basis for a German normal vote so that it makes sense to compute normal vote results from 1983 to 1998.  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