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   102019篇
  免费   3342篇
  国内免费   75篇
管理学   12009篇
劳动科学   36篇
民族学   914篇
人才学   32篇
人口学   7360篇
丛书文集   4061篇
教育普及   1篇
理论方法论   10083篇
综合类   7499篇
社会学   43865篇
统计学   19576篇
  2023年   543篇
  2022年   402篇
  2021年   745篇
  2020年   1680篇
  2019年   2309篇
  2018年   2290篇
  2017年   3481篇
  2016年   2610篇
  2015年   2395篇
  2014年   3051篇
  2013年   19418篇
  2012年   3100篇
  2011年   3138篇
  2010年   2953篇
  2009年   3148篇
  2008年   2935篇
  2007年   2921篇
  2006年   3114篇
  2005年   3134篇
  2004年   2584篇
  2003年   2227篇
  2002年   2333篇
  2001年   2399篇
  2000年   2030篇
  1999年   1945篇
  1998年   1629篇
  1997年   1496篇
  1996年   1479篇
  1995年   1459篇
  1994年   1382篇
  1993年   1289篇
  1992年   1261篇
  1991年   1221篇
  1990年   1200篇
  1989年   1015篇
  1988年   1115篇
  1987年   968篇
  1986年   891篇
  1985年   1077篇
  1984年   1120篇
  1983年   982篇
  1982年   899篇
  1981年   814篇
  1980年   790篇
  1979年   843篇
  1978年   724篇
  1977年   660篇
  1976年   597篇
  1975年   568篇
  1974年   470篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
31.
This qualitative study examines the narratives of seven heterosexual, cisgender individuals who identify both as persons of color and as positively disposed toward LGB and transgender-identified persons. Using psycho-discursive qualitative methodology, the authors will present the narrative strategies taken up by these positively disposed cisgender heterosexuals of color as they attempt to position themselves as supportive of LGB and transgender persons while negotiating the discourse of heteronormativity. The three narrative strategies have been titled differentiation, empathy, and coherence. In addition to mapping the three narrative strategies, the authors also explore why informants may choose certain strategies over others and argue that the intersection of social identities must be considered when attempting to understand social oppression. Implications for the human services fields will be discussed.  相似文献   
32.
In this article, we propose a novel approach for testing the equality of two log-normal populations using a computational approach test (CAT) that does not require explicit knowledge of the sampling distribution of the test statistic. Simulation studies demonstrate that the proposed approach can perform hypothesis testing with satisfying actual size even at small sample sizes. Overall, it is superior to other existing methods. Also, a CAT is proposed for testing about reliability of two log-normal populations when the means are the same. Simulations show that the actual size of this new approach is close to nominal level and better than the score test. At the end, the proposed methods are illustrated using two examples.  相似文献   
33.
34.
35.
Feminist and empowerment theories are especially important to the understanding of individual and sociopolitical levels of social work assessment and intervention. Incorporating feminist and empowerment approaches in practice will provide social workers with the knowledge, values and skills most likely to promote human rights and social justice. In this paper, we present an overview of both theories and illustrate them with a case example.  相似文献   
36.
37.
Lifetime Data Analysis - Frailty models are generally used to model heterogeneity between the individuals. The distribution of the frailty variable is often assumed to be continuous. However, there...  相似文献   
38.
Abstract

The economic mobility of individuals and households is of fundamental interest. While many measures of economic mobility exist, reliance on transition matrices remains pervasive due to simplicity and ease of interpretation. However, estimation of transition matrices is complicated by the well-acknowledged problem of measurement error in self-reported and even administrative data. Existing methods of addressing measurement error are complex, rely on numerous strong assumptions, and often require data from more than two periods. In this article, we investigate what can be learned about economic mobility as measured via transition matrices while formally accounting for measurement error in a reasonably transparent manner. To do so, we develop a nonparametric partial identification approach to bound transition probabilities under various assumptions on the measurement error and mobility processes. This approach is applied to panel data from the United States to explore short-run mobility before and after the Great Recession.  相似文献   
39.
由于长期注水开发和层间非均质性影响,高含水期油藏各小层层间压力结构差异严重,掌握差异状况是合理调整的重要依据。针对现场分层测压资料少,单层压力资料获取困难的情况,应用渗流力学原理建立了高含水期地层层间压力结构差异量化数学模型,模型的关键参数可以通过生产数据计算获得。枣园油田的实例验证表明,高含水油藏层间压力存在明显差异,该方法能够确定各小层的压力差异状况。量化计算结果和实测资料相接近,有利于认清开发矛盾,为合理调整提供技术依据。  相似文献   
40.
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