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   13114篇
  免费   403篇
  国内免费   15篇
管理学   1607篇
民族学   80篇
人才学   1篇
人口学   1154篇
丛书文集   147篇
理论方法论   1222篇
综合类   692篇
社会学   6974篇
统计学   1655篇
  2023年   70篇
  2021年   107篇
  2020年   207篇
  2019年   255篇
  2018年   328篇
  2017年   476篇
  2016年   323篇
  2015年   266篇
  2014年   313篇
  2013年   2054篇
  2012年   479篇
  2011年   465篇
  2010年   392篇
  2009年   328篇
  2008年   400篇
  2007年   413篇
  2006年   418篇
  2005年   362篇
  2004年   285篇
  2003年   253篇
  2002年   269篇
  2001年   341篇
  2000年   281篇
  1999年   273篇
  1998年   200篇
  1997年   168篇
  1996年   158篇
  1995年   172篇
  1994年   158篇
  1993年   162篇
  1992年   185篇
  1991年   186篇
  1990年   183篇
  1989年   159篇
  1988年   167篇
  1987年   191篇
  1986年   147篇
  1985年   158篇
  1984年   176篇
  1983年   153篇
  1982年   151篇
  1981年   122篇
  1980年   111篇
  1979年   124篇
  1978年   95篇
  1977年   80篇
  1976年   93篇
  1975年   111篇
  1974年   84篇
  1972年   64篇
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
221.
Public policy decisions in health are increasingly difficult and expensive. Although there will never be enough information available, private foundations can help to bridge the most important gaps in knowledge. Larger foundations may also wish to respond to those who doubt the value of foundation activities. This article reviews the experiences over the past eight years of The Robert Wood Johnson Foundation in employing evaluation and related social research procedures in the planning and implementation of a major philanthropic effort to improve the health and medical care of Americans. Discussed are the still evolving Foundation evaluation framework, the unanticipated problems in undertaking specific evaluations, and the substantive findings of some of the studies.  相似文献   
222.
Summary Analysis of data from various phases of a study of post-partum amenorrhoea in Bangladesh illustrated good aggregate consistency of response on menstrual status, but less individual consistency on duration of post-partum amenorrhoea. Using life table techniques, the median duration of amenorrhoea was calculated as 19.9 months for women with births between February and September 1974. There were substantial seasonal variations in duration, with the median decreasing from 21.5 months for women with February births to 16.9 months for those with September births. By contrast, the median duration of post-partum amenorrhoea varies by only two months for women in the lowest and highest quartiles of weight and weight for height. The seasonal pattern was similar for all weight groups.  相似文献   
223.
Summary The theory of the low-level equilibrium trap asserts that an increase in income stimulates population growth sufficiently so that the additional people 'eat up' the 'surplus' over subsistence, and hence drive the level of income back to subsistence. Originally the theory referred primarily to mortality, but nowadays its application is to fertility. In the long-run equilibrium context in which the theory is ordinarily presented, the fact that the long-run elasticity of fertility with respect to income is negative in less developed countries fatally contradicts the accepted version of the trap. But to give every chance for trap theory to be meaningful, the paper presents a period-by-period analysis, embodying larger-than-observed positive elasticities during the early years and the logically necessary counterbalancing negative elasticities during the later years. These elasticities are combined with consumption and production figures for various age groups to estimate the effect in each year after the windfall, and altogether. The results show that even under assumptions not charitable to the conclusion of this paper, additional children do not even come close to 'eating up' the increase in income which induced their births, so that the trap theory is falsified.  相似文献   
224.
225.
Most evaluators seem to presume that all evaluative studies should result in conclusive evidence. Often, however, less than conclusive evidence may not only suffice, but be the only real alternative under conditions of limited evaluation resources. Three levels of evidence common to evaluation studies are discussed: suggestive evidence, preponderant evidence, and conclusive evidence. Ten factors are also presented which can be used to determine the level of certainty appropriate for a given evaluation study. Consideration of these factors enables the evaluator to specify when less than conclusive evidence is acceptable.  相似文献   
226.
Jones JM  McNeely RL 《Child welfare》1981,60(3):148-160
An innovative model for the training of social welfare students in the special skills essential in child welfare work is predicated upon a classification system of children at risk and a continuum of services.  相似文献   
227.
Neighborhood opposition to community-based treatment centers (CBTCs) has prompted fears that these centers will become concentrated in inner city, "transitional neighborhoods." These neighborhoods are thought to lack the willingness and/or resources to oppose CBTCs. This paper examines the distribution of CBTCs in a northern metropolitan county. The findings suggests that the fears of "ghettoization" may be real only for certain types of centers. Most centers were located in higher-status city and suburban neighborhoods. However, these centers were physically or visually isolated from the surrounding housing, making them less likely to attract attention and therefore less likely to arouse neighborhood opposition.  相似文献   
228.
229.
During the summer of 1972 in-depth interviews were conducted with 96 Shoshone and Arapahoe Indian women living on the Wind River Reservation in Central Wyoming. All were aged 15-49 and were users of the reservation health service. It was found the women fell into 4 groups: current contraceptive users, 42.7%; pregnant or seeking to become pregnant, 10.4%; infertile due to menopause or sterilization, 18.8%; and fertile never-users, 28.1%. The contraceptive users tended to be older, married, and have as many children as they want. The fertile never-users tended to be in their teens and generally unmarried. When asked why they did not use contraception their answer was 'because I am not married.' It is suggested that general education on contraception be provided the younger women so that when they achieve desired family size they will be informed as to family planning methods. It was found that religious belief against contraception was important to the young never-users, but not to the women who had completed their families. In fact, 73% of the users said their religion, which most identified as Roman Catholicism, had no influence on their contraceptive use while 27% said they were aware of church disapproval but used contraception anyway.  相似文献   
230.
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