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   30984篇
  免费   620篇
管理学   4126篇
民族学   204篇
人才学   7篇
人口学   4150篇
丛书文集   130篇
教育普及   2篇
理论方法论   2592篇
现状及发展   1篇
综合类   546篇
社会学   14631篇
统计学   5215篇
  2023年   109篇
  2021年   112篇
  2020年   333篇
  2019年   529篇
  2018年   2062篇
  2017年   2286篇
  2016年   1550篇
  2015年   460篇
  2014年   545篇
  2013年   3559篇
  2012年   1080篇
  2011年   1719篇
  2010年   1517篇
  2009年   1245篇
  2008年   1347篇
  2007年   1534篇
  2006年   550篇
  2005年   728篇
  2004年   752篇
  2003年   665篇
  2002年   552篇
  2001年   547篇
  2000年   463篇
  1999年   441篇
  1998年   352篇
  1997年   343篇
  1996年   366篇
  1995年   313篇
  1994年   304篇
  1993年   292篇
  1992年   321篇
  1991年   318篇
  1990年   294篇
  1989年   289篇
  1988年   278篇
  1987年   249篇
  1986年   234篇
  1985年   282篇
  1984年   270篇
  1983年   252篇
  1982年   208篇
  1981年   183篇
  1980年   197篇
  1979年   197篇
  1978年   155篇
  1977年   153篇
  1976年   150篇
  1975年   128篇
  1974年   112篇
  1973年   90篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
This longitudinal study examined relations between mother–child relationship quality and father support in adolescence (ages 15–19) and emerging adults’ (ages 24–28) romantic anxiety and avoidance in a sample that experienced parental divorce in childhood (n = 72). A significant interactive effect of mother–adolescent relationship quality and father support on romantic anxiety occurred. High levels of father support protected emerging adults from the negative effects of a low quality mother–adolescent relationship. These results highlight the importance of examining effects of one parental relationship in the context of the other and the role that nonresidential fathers play in influencing their offspring’s romantic attachment.  相似文献   
992.
This study tested sexual abuse as a unique predictor of subsequent adolescent sexual behaviors, pregnancy, and motherhood when in company with other types of maltreatment (physical abuse, neglect) and alternative behavioral, family, and contextual risk factors in a prospective, longitudinal study of maltreated (n = 275) and comparison (n = 239) nulliparous females aged 14–19 years old assessed annually through 19 years old. Hierarchical regression was used to disentangle risk factors that account for the associations of maltreatment type on risky sexual behaviors at 19 years old, adolescent pregnancy, and adolescent motherhood. Findings indicate that sexual and physical abuse remain significant predictors of risky sexual behaviors, and that sexual abuse remains a significant predictor of adolescent motherhood when alternative explanatory variables are controlled.  相似文献   
993.
It has been demonstrated that sexual minority men (SMM) participate in sexting. While research has shown that engagement in the exchange of sexually explicit media is associated with poor health outcomes, no previous research has investigated its association with sleep health outcomes. This study sought to examine the association between sexually explicit media and sleep health among SMM, a population that suffers from poor sleep health. A popular geosocial networking application was used to recruit SMM individuals (N?=?580) in the Paris, France, metropolitan area. Multivariate analyses, adjusting for sociodemographics, were used to test the association between the frequency of sexually explicit messaging and three dimensions of sleep health: (1) sleep quality, (2) sleep duration, and (3) two aspects of sleep problems. In multivariate analyses, those who reported engaging in sexually explicit messaging more were more likely to report getting less than seven?hours of sleep (aRR = 1.24; 95% CI = 1.08, 1.43) compared with those who reported engaging in sexually explicit messaging less. No significant associations were found between sexting and sleep quality or reporting sleep problems. Sexually explicit messaging was associated with shorter sleep duration. Intervention targeted at individuals who sext could potentially improve sleep health outcomes.  相似文献   
994.
Although we know that high‐quality employee–organization relationships are beneficial, these relationships are complex and not fully understood, especially among employees of nonprofit organizations. In particular, we know little about how these employees perceive trust, which may overlook an important contributor to effective management. We begin to address this issue by testing a new theoretical model that conceptualizes perceived insider status, psychological ownership, and organizational identification as foundations for the perception of justice and subsequent trust. Our results indicate that psychological ownership and perceived insider status relate to trust through procedural and interpersonal justice. These results contrast those typically found in for‐profit contexts in that organizational identification did not predict justice and that distributive and informational justice did not predict trust.  相似文献   
995.
The adolescent transition begins with the onset of puberty which, upstream in the brain, is initiated by the gonadotropin‐releasing hormone (GnRH) pulse generator that activates the release of peripheral sex hormones. Substantial research in human and animal models has revealed a myriad of cellular networks and heritable genes that control the GnRH pulse generator allowing the individual to begin the process of reproductive competence and sexual maturation. Here, we review the latest knowledge in neuroendocrine pubertal research with emphasis on genetic and epigenetic mechanisms underlying the pubertal transition.  相似文献   
996.
Urban Ecosystems - Urban streams provide important ecosystem services to cities’ population, from the maintenance of urban biodiversity, temperature, humidity and air quality to improving...  相似文献   
997.
Urban Ecosystems - It is generally thought that increased human activity or infrastructure automatically translates to decreased wildlife activity or abundance. We surveyed dragonflies and...  相似文献   
998.
Urban Ecosystems - Although amphibians use human-created habitats in urban landscapes, few studies have investigated the quality of these habitats. To assess habitat quality of stormwater...  相似文献   
999.
Urban Ecosystems - Urban areas with residential yards (= domestic gardens) provide a diverse environmental mosaic characterized by high plant architectural and species diversity and variation in...  相似文献   
1000.
Urban Ecosystems - The urban landscape constitutes a key aspect of human - nature interactions, as more than 60% of the world’s population resides in cities and their suburbs. This study...  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