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   19481篇
  免费   597篇
  国内免费   1篇
管理学   2593篇
民族学   111篇
人口学   1725篇
丛书文集   74篇
教育普及   1篇
理论方法论   1746篇
综合类   181篇
社会学   9896篇
统计学   3752篇
  2023年   130篇
  2022年   80篇
  2021年   133篇
  2020年   346篇
  2019年   513篇
  2018年   607篇
  2017年   790篇
  2016年   609篇
  2015年   407篇
  2014年   569篇
  2013年   3508篇
  2012年   732篇
  2011年   681篇
  2010年   498篇
  2009年   403篇
  2008年   531篇
  2007年   484篇
  2006年   521篇
  2005年   406篇
  2004年   418篇
  2003年   350篇
  2002年   363篇
  2001年   468篇
  2000年   412篇
  1999年   402篇
  1998年   311篇
  1997年   261篇
  1996年   278篇
  1995年   288篇
  1994年   246篇
  1993年   256篇
  1992年   299篇
  1991年   294篇
  1990年   288篇
  1989年   253篇
  1988年   238篇
  1987年   201篇
  1986年   229篇
  1985年   249篇
  1984年   216篇
  1983年   191篇
  1982年   159篇
  1981年   130篇
  1980年   155篇
  1979年   170篇
  1978年   133篇
  1977年   114篇
  1976年   87篇
  1975年   91篇
  1974年   93篇
排序方式: 共有10000条查询结果,搜索用时 171 毫秒
221.
This study examines the possibility that estimation of the effect of breast-feeding on infant survival is affected by selection bias, in that children who are healthier at birth may be more likely to be breast-fed. Data are from the 1976 Malaysian Family Life Survey. "Ordinary logit models for breast-feeding and survival are estimated, and the results suggest that selection is indeed present. For example, children of higher birth weight appear to be more likely to be breast-fed and likely to survive. In addition, weight at birth and the duration of breast-feeding appear to be linked." Using birth weight as an indicator for the child's health, the authors conclude that "the direct influence of breast-feeding on survival remains of overwhelming importance even after corrections for selection bias are made."  相似文献   
222.
"This paper seeks to (1) identify socioeconomic variables that are expected to generate fertility differentials; (2) hypothesize the direction and magnitude of the effect of each variable by reference to a demand-for-children model; and (3) test empirically the model using evidence from Costa Rica. The estimates are obtained from a ten-percent systematic random sample of all Costa Rican individual-family households. There are 15,924 families in the sample...." The authors specifically seek "to capture the effects of changing relative prices and available income and time constraints on parental preferences for children. Least-squares estimates show statistically significant relationships between household fertility and opportunity cost of time, parental education, occurrence of an extended family, medical care, household sanitation, economic sector of employment, and household stock of nonhuman capital."  相似文献   
223.
Introduction     
In the introduction to this special issue on temporary worker programs, the author defines the term temporary worker and reviews worldwide research, writings, and policies to date pertaining to temporary workers. Labor market and economic effects, socio-administrative conditions, and effects on the labor-sending societies are discussed. Noting that mutually exclusive arguments are presented within one issue of the journal, the author introduces the authors of the individual articles and their subjects. It is determined that the temporary worker phenomenon is now global and that having an understanding of these workers is increasingly central to understanding key socioeconomic and political processes affecting modern industrial and nonindustrial societies.  相似文献   
224.
An analysis of the foreign population in Kuwait shows that foreign nationals make up 60 percent of the population and 78 percent of the labor force in Kuwait. The implications of these figures for the Kuwaiti labor force are discussed by analyzing the occupational structures of Kuwaitis and non-Kuwaitis. "Structural analysis of the labor force indicates that 62 percent of Kuwaiti males are concentrated in administrative and service occupations while their percentage in sales and production work has declined during 1970-80. This demonstrates the need for reorienting educational/training programs and changing Kuwaiti attitudes towards manual work to ensure the realization of the 'Kuwaitization' process, and balance the nationals with foreign nationals." mortality has stabilized at relatively high levels and there is resistance to family planning. The author concludes that the main cause of the stalling of the demographic transition process is to be found in the role of the state and the dynamics of the social structure and that "demographic trends will depend more on the changes in social structure, land reforms, and response of the formal governing system to the needs of the underprivileged sections of the society, rather than on the health and family planning policies."  相似文献   
225.
"This article highlights important developments in the character of temporary worker flows to Canada between 1973 and 1985 through the use of unpublished data and new measures for analyzing this data. The number of employment authorizations are converted to person years to indicate the overall labor market impact of temporary worker flows and this measure is employed in an analysis of unpublished data from Employment and Immigration Canada. The analysis reveals that a significant and growing proportion of employment authorizations are exempted from governmental procedures which link the admission of temporary workers to the Canadian labor market." Reasons for these exemptions and policy implications are discussed  相似文献   
226.
Contributors to disruption and dissolution of older-child adoptions   总被引:1,自引:0,他引:1  
According to recent evidence, adoptive placements that do not work out are increasingly common. This article reviews research on rates of, and contributors to, adoption and "foster-adoption" disruptions and dissolutions. Implications for practice are included.  相似文献   
227.
Two questions concerning the location of a single facility by a voting process are investigated for transportation networks:
  • - What is the maximum number of customers located on the network preferring some rival point over a voting solution?
  • - How does the average distance of the customers to the facility increase when a voting location instead of a Weber location is chosen for the facility?
  • Complete answers are given for general networks and for certain planar networks, viz., the so-called generalized cacti.  相似文献   
    228.
    This paper demonstrates the need for a broad array of clinical services in treating the emotionally disturbed, mildly retarded youngster in the foster care system. A hypothesis suggests that cognitive deficits and borderline pathology are interrelated, and that treatment involves modifications of traditional therapeutic techniques. The definition of clinical is expanded to include seemingly concrete and environmental services, in addition to the office therapy session. Finally, some systemic impediments to effective treatment of the population are explored.This paper was completed as a requirement of the Post-Master's Program in Advanced Clinical Social Work of Hunter College School of Social Work.  相似文献   
    229.
    This article describes the therapeutic use of canines in child welfare work. The chronically rejected child, or those who virtually spend their entire youth in care, tend to develop a withdrawn, depressed, and suspicious posture toward their relations with other people. This ultimately results in their failure to respond to conventional treatment modalities. Under these circumstances, the canine intervention may prove to be a valuable adjunct, helping to develop and to expedite the process of the therapeutic alliance.This article is a revised version of one presented to meet the requirements for the Masters in Social Work Degree from Hunter College School of Social Work.  相似文献   
    230.
    Recent migration trends involving Italy are described. The authors note that Italy has changed from a manpower-exporting country to a labor-importing country. Consideration is also given to changes in internal migration patterns.  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