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   14001篇
  免费   351篇
  国内免费   60篇
管理学   1603篇
劳动科学   1篇
民族学   84篇
人才学   5篇
人口学   1133篇
丛书文集   296篇
理论方法论   1136篇
综合类   1517篇
社会学   5838篇
统计学   2799篇
  2023年   69篇
  2022年   117篇
  2021年   127篇
  2020年   217篇
  2019年   256篇
  2018年   354篇
  2017年   488篇
  2016年   324篇
  2015年   318篇
  2014年   396篇
  2013年   2358篇
  2012年   565篇
  2011年   475篇
  2010年   449篇
  2009年   365篇
  2008年   445篇
  2007年   407篇
  2006年   401篇
  2005年   364篇
  2004年   270篇
  2003年   259篇
  2002年   269篇
  2001年   359篇
  2000年   315篇
  1999年   283篇
  1998年   210篇
  1997年   178篇
  1996年   222篇
  1995年   195篇
  1994年   207篇
  1993年   175篇
  1992年   206篇
  1991年   214篇
  1990年   199篇
  1989年   173篇
  1988年   196篇
  1987年   179篇
  1986年   142篇
  1985年   181篇
  1984年   181篇
  1983年   159篇
  1982年   122篇
  1981年   100篇
  1980年   99篇
  1979年   121篇
  1978年   94篇
  1977年   82篇
  1975年   64篇
  1974年   67篇
  1973年   60篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
951.
Reducing non-marital childbearing and making nonresidential fathers take greater responsibility for their children were identified as goals of numerous policy changes since the 1980s. Child-support award rates for children born to unmarried parents have been quite low historically, leading lawmakers to focus on increasing both award and payment rates for this group. Nonmarital fathers are also much less likely to have contact with their children. Although evidence suggests that policy efforts increase child support awards and receipt, the link between child support policies, child support outcomes, and father-child contact has received less attention. This paper uses data from the Survey of Income and Program Participation on children born between 1985–1997 to investigate the relationship between child-support award and receipt and the amount of contact that fathers have with their non-residential children. Since it is likely that both of these behaviors are, in part, determined by unobservable characteristics of the father, we estimate an instrumental variables Tobit model. The model is identified by our assumption that child support policy variables can impact child support awards and payments, but father-child contact cannot be directly legislated. Our results suggest that there are unintended, but desirable effects of child support establishment and collection. Policies to collect child support not only increase financial resources to families, but through their impact on payments increase visitation and contact between these children and their fathers. The estimated impact of receiving child support on contact is more than 27 days per year.An earlier version of this paper was presented at the Annual Meetings of the American Economic Association, Washington DC, January 2003 and the Annual Meetings of the Association of Public Policy and Management, November 2003. Support from NICHD Grant # HD30944 is gratefully acknowledged. We would like to thank Suzann Eshleman for excellent computer programming and James Scully for providing us with data on genetic testing laws.  相似文献   
952.
Adolescent suicide is increasing in the United States and the incidence of suicide gestures and attempts in juvenile correctional facilities is high. The attitudes of correctional staff toward adolescents and toward suicidal behavior may contribute to the increase. Suicide is often the outcome of a progression of problems that have isolated the adolescent from meaningful social relationships. Correctional staff must be aware of the phenomenon of adolescent suicide and be given training to deal with it effectively within the institution. Institutional staff have commonly seen suicide gestures or attempts as acting out behavior rather than a symptom of low self-esteem or inability to cope with institutional placement. This discussion examines the phenomenon of adolescent suicide and the impact the juvenile justice system has on its occurrence. It will also include an examination of interdisciplinary interventive strategies which can be used in an institutional setting.  相似文献   
953.
The regulatory environment is assumed to be characterized by changing labor costs and productivity, and by the existence of set-up costs for rate reviews. If the commission behaves myopically, price changes are shown to occur only when a threshold deviation of actual from target return is reached. During periods where productivity (wage) increases predominate, the actual return is thus consistently higher (lower) than the target level. If, however, the commission incorporates dynamic trends into its decision-making process, there are intervals where actual return both exceeds and falls short of target levels; on average, the firm earns over time a return that is approximately equal to the target level.  相似文献   
954.
The McMaster Model of Family Functioning   总被引:4,自引:0,他引:4  
The model of family functioning being presented is the product of over twenty years of research in clinical work with family units. A method of family therapy has been developed based upon this model and will be described in a future issue. The model utilizes a general systems theory approach in an attempt to describe the structure, organization, and transactional patterns of the family unit. It allows examination of families along the total spectrum ranging from healthy to severely pathological in their functioning. It is based upon a Judaeo-Christian value set, and allows attention to be paid to cultural differences and other issues of cultural relativity .  相似文献   
955.
The legalization of abortion is still a live issue in Queensland. The numbers and characteristics of women seeking abortion through the Children by Choice Association in 1973–74 and in 1980 were studied since no official statistics on abortion are available. From 1974 to 1980 there was a threefold growth in demand and a threefold rise in the proportion seeking their second or subsequent abortion. Both samples closely reflect the Queensland population as measured by place of birth and religious affiliation. Contraceptive knowledge was found to be associated with education while the proportion who stated they had formal lessons at school rose from 3% to 16% between the samples. In both samples two-thirds of the pregnancies resulted when no physical contraceptive was in use. Social characteristics of the women and men involved were investigated, as well as factors in the abortion decision.  相似文献   
956.
To prove the optimality properties of the maximum likelihood (and also minimum distance) discriminant rule Rogers (1980, p. 98) embeds the maximum likelihood discriminant function in a Cauchy-Schwartz inequality. This embedding procedure of Rogers (1980) may be used to derive a new distribution for Anderson's (1958) classification statistic.  相似文献   
957.
958.
959.
960.
American Indian adults are thought to experience significant depressive symptoms at rates several times higher than adults in the general population, yet we know very little about factors associated with depressive symptoms among this under studied group. Many researchers have argued that depressive symptoms are associated with conflicts between American Indian traditional cultural values, practices, and beliefs and those of the majority culture. This report, based on a sample 287 American Indian adults from the upper Midwest, takes into account two measures of cultural effects: perceived discrimination, as one indicator of culture conflict, and traditional practices, as a measure of cultural identification. The results indicate that discrimination is strongly associated with depressive symptoms among American Indian adults and that engaging in traditional practices is negatively related to depressive symptoms. Moreover, interaction effects between perceived discrimination and traditional practices indicate that engaging in traditional practices buffers the negative effects of discrimination among those who regularly participate in them.  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