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   568篇
  免费   29篇
管理学   104篇
民族学   4篇
人才学   2篇
人口学   49篇
丛书文集   3篇
理论方法论   64篇
综合类   7篇
社会学   322篇
统计学   42篇
  2022年   5篇
  2021年   3篇
  2020年   8篇
  2019年   12篇
  2018年   9篇
  2017年   16篇
  2016年   15篇
  2015年   15篇
  2014年   22篇
  2013年   61篇
  2012年   20篇
  2011年   17篇
  2010年   11篇
  2009年   11篇
  2008年   15篇
  2007年   20篇
  2006年   17篇
  2005年   19篇
  2004年   16篇
  2003年   17篇
  2002年   21篇
  2001年   12篇
  2000年   7篇
  1999年   6篇
  1998年   16篇
  1997年   12篇
  1996年   14篇
  1995年   10篇
  1994年   15篇
  1993年   14篇
  1992年   12篇
  1991年   12篇
  1990年   11篇
  1989年   5篇
  1988年   6篇
  1987年   7篇
  1986年   7篇
  1985年   7篇
  1984年   10篇
  1983年   9篇
  1982年   3篇
  1981年   7篇
  1980年   3篇
  1978年   6篇
  1977年   10篇
  1976年   4篇
  1975年   3篇
  1974年   4篇
  1973年   5篇
  1972年   3篇
排序方式: 共有597条查询结果,搜索用时 812 毫秒
581.
582.
This is the first multisite, prospective study of behavioral and mental health disorders of youth in residential treatment centers (RTC) and therapeutic foster care (TFC), and the first study to compare the two. This study addressed two questions in a sample of 22 agencies in 13 states: (1) how prevalent were emotional and behavioral disorders in the youth admitted to RTCs and TFC?, and (2) were the youth in RTCs significantly more likely to be disturbed than youth served in TFCs? Data were drawn from the Time 1 phase of the longitudinal national "Odyssey Project" developed by the Child Welfare League of America (1995). Measures included an extensive child and family characteristics form (CFC) and the Child Behavior Checklist (CBCL). The results revealed extremely high levels of behavioral and mental health disorders in the sample as a whole, well above the norms for a non-child welfare population. The prevalence of disorder in the RTC population was substantially greater than in the TFC population.  相似文献   
583.
584.
585.
In recent years the unconstrained binary quadratic program (UBQP) has grown in importance in the field of combinatorial optimization due to its application potential and its computational challenge. Research on UBQP has generated a wide range of solution techniques for this basic model that encompasses a rich collection of problem types. In this paper we survey the literature on this important model, providing an overview of the applications and solution methods.  相似文献   
586.
This phenomenological study is the second phase of a larger mixed methods study of a relationship‐enhancement program for couples expecting their first child (see Gambrel & Piercy, this issue). The 4‐week Mindful Transition to Parenthood Program uses mindfulness practices and interpersonal activities to develop skills of internal and interpersonal attunement. Based on semi‐structured interviews with thirteen couples, four overarching themes emerged: (a) positive changes for self, (b) improvements in couple relationship, (c) more prepared for baby, and (d) male involvement. Participants stated that the program increased their acceptance and awareness, deepened connections with their partners, and led them to be more confident about becoming parents. Male participants felt they became more identified as fathers. The authors discuss the clinical implications of these findings. Video Abstract  相似文献   
587.
Service designers predict market share and sales for their new designs by estimating consumer utilities. The service's technical features (for example, overnight parcel delivery), its price, and the nature of consumer interactions with the service delivery system influence those utilities. Price and the service's technical features are usually quite objective and readily ascertained by the consumer. However, consumer perceptions about their interactions with the service delivery system are usually far more subjective. Furthermore, service designers can only hope to influence those perceptions indirectly through their decisions about nonlinear processes such as employee recruiting, training, and scheduling policies. Like the service's technical features, these process choices affect quality perceptions, market share, revenues, costs, and profits. We propose a heuristic for the NP‐hard service design problem that integrates realistic service delivery cost models with conjoint analysis. The resulting seller's utility function links expected profits to the intensity of a service's influential attributes and also reveals an ideal setting or level for each service attribute. In tests with simulated service design problems, our proposed configurations compare quite favorably with the designs suggested by other normative service design heuristics.  相似文献   
588.
As dynamic collaborations between networks of specialists have become more central to developing cutting-edge innovations, designing and sustaining innovation policies that foster them has become an increasingly central concern. This article reviews the characteristics of the “developmental network” or “neo-developmental” states that have been shown to foster innovations at the technological horizon. It then analyzes the US case to suggest why some developmental network approaches to governance have proven relatively durable, while others have not. We conclude with a discussion of what can – and cannot – be learned from the US case, and suggest the importance of comparative work on the sustainability of effective innovation-centered approaches to governance.  相似文献   
589.
An environmental event that damages housing and the built environment may result in either a short- or long-term out-migration response, depending on residents' recovery decisions and hazard tolerance. If residents move only in the immediate disaster aftermath, then out-migration will be elevated only in the short-term. However, if disasters increase residents' concerns about future risk, heighten vulnerability, or harm the local economy, then out-migration may be elevated for years after an event. The substantive aim of this research brief is to evaluate hypotheses about short- and long-term out-migration responses to the highly destructive 2005 hurricane season in the Gulf of Mexico. The methodological aim is to demonstrate a difference-in-differences (DID) approach analysing time series data from Gulf Coast counties to compare short- and long-differences in out-migration probabilities in the treatment and control counties. We find a large short-term out-migration response and a smaller sustained increase for the disaster-affected coastal counties.  相似文献   
590.
The problem of maximizing diversity deals with selecting a set of elements from some larger collection such that the selected elements exhibit the greatest variety of characteristics. A new model is proposed in which the concept of diversity is quantifiable and measurable. A quadratic zero-one model is formulated for diversity maximization. Based upon the formulation, it is shown that the maximum diversity problem is NP-hard. Two equivalent linear integer programs are then presented that offer progressively greater computational efficiency. Another formulation is also introduced which involves a different diversity objective. An example is given to illustrate how additional considerations can be incorporated into the maximum diversity model.  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