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   19251篇
  免费   345篇
  国内免费   1篇
管理学   2773篇
民族学   69篇
人才学   1篇
人口学   1871篇
丛书文集   78篇
教育普及   2篇
理论方法论   1717篇
现状及发展   1篇
综合类   257篇
社会学   9299篇
统计学   3529篇
  2021年   112篇
  2020年   275篇
  2019年   375篇
  2018年   438篇
  2017年   600篇
  2016年   472篇
  2015年   347篇
  2014年   456篇
  2013年   2986篇
  2012年   633篇
  2011年   608篇
  2010年   445篇
  2009年   370篇
  2008年   444篇
  2007年   460篇
  2006年   452篇
  2005年   439篇
  2004年   403篇
  2003年   374篇
  2002年   416篇
  2001年   519篇
  2000年   530篇
  1999年   460篇
  1998年   341篇
  1997年   309篇
  1996年   321篇
  1995年   301篇
  1994年   283篇
  1993年   289篇
  1992年   342篇
  1991年   316篇
  1990年   285篇
  1989年   291篇
  1988年   288篇
  1987年   250篇
  1986年   244篇
  1985年   277篇
  1984年   266篇
  1983年   250篇
  1982年   215篇
  1981年   180篇
  1980年   164篇
  1979年   194篇
  1978年   176篇
  1977年   159篇
  1976年   134篇
  1975年   157篇
  1974年   118篇
  1973年   115篇
  1972年   93篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
871.
872.
Children with attention‐deficit/hyperactivity disorder (ADHD) exhibit marked difficulty with frequent and intense shifts in negative or positive emotions, referred to as emotional lability. This study examines the relationships between negative emotional lability (NEL), ADHD, and reactive and proactive aggression. A community sample of 96 children (53 with ADHD, 43 control) ages 8–12 and their parents completed a baseline session include a diagnostic structured interview and the Reactive–Proactive Aggression Questionnaire (RPAQ). Parents then rated their child's NEL using the Positive and Negative Affect Scale as part of an Ecological Momentary Assessment protocol 3 times a day for 28 days. Seventy‐three participants (37 with ADHD, 36 control) completed the RPAQ at follow‐up. Hierarchical regression analyses indicated that NEL significantly and independently estimates reactive aggression at baseline and follow‐up, regardless of ADHD status. NEL and ADHD status significantly estimates concurrent proactive aggression, but not at follow‐up. Results of this study suggest that NEL accounts for a significant amount of the variability in reactive aggression, a common difficulty in children with ADHD. Further, individuals that are reportedly emotionally labile become more reactively aggressive over time. Both ADHD diagnostic and NEL are predictors of proactive aggression at baseline, although no interaction occurred.  相似文献   
873.
The aim of this study was to explore young children's perceptions, beliefs, and anticipated outcomes about different types of social withdrawal (shyness, unsociability, social avoidance). Participants were N = 212 children (n = 110 boys) aged 2.55–6.37 years (M = 4.86, SD = 0.89) recruited from three preschools and kindergartens in Italy. Children were interviewed individually and asked about hypothetical peers displaying different types of social withdrawal (i.e., shy, unsociable, socially avoidant) and for comparison purposes, aggressive and socially competent behaviors were also assessed. Among the three vignettes depicting types of withdrawn children, children rated the hypothetical shy peer as having the highest social motivations, the unsociable peer as receiving the least sympathy from others, and the avoidant peer as being the least intelligent and least liked by the teacher. In addition, girls reported wanting to play more with the shy peer than boys, and kindergarteners reported a higher affiliative preference for all subtypes of socially withdrawn peers than preschoolers. These findings suggest that Italian young children have a quite sophisticated ability to differentiate among the different social motivations and emotions that may underlie social withdrawal.  相似文献   
874.
The current study examined parental advice given to fourth‐ and fifth‐grade preadolescents who imagined being bystanders to different forms of bullying (physical, verbal, property attack, social manipulation, exclusion). We assessed the frequency with which parents advised youth to follow specific intervention strategies (stop the bully, help/comfort the victim, tell adults), and we tested whether the frequency by which parents provided each kind of advice varied by the form of bullying described. One hundred and six fourth‐ and fifth‐grade preadolescents completed an interaction in which their parent gave them advice about how to respond if they were bystanders to five hypothetical bullying situations. Each situation described a different form of bullying. Across forms of bullying, parents most frequently told bystander children to intervene by telling an adult. However, advice differed based on the form of bullying presented. Parents most frequently advised children to “tell an adult” in response to physical bullying or property attacks, most frequently advised children to “help/comfort victims” in response to social exclusion and physical attacks, and most frequently advised children to “stop the bully” in response to verbal and social manipulation bullying.  相似文献   
875.
To test the hypothesis that social engagement is a foundational aspect of other peer social competence indicators during early childhood, 160 Portuguese preschool children (“3‐year‐olds”) were observed at least in two different school years, using a battery of validated social competence assessments based on direct observations and child interviews. Multilevel growth models tested whether social engagement predicted initial values and linear changes in the other social competence indicators. Results were consistent with the hypothesis, insofar as both initial values and changes in social engagement significantly predicted initial values and changes in other social competence indicators. Additionally, the number of children's reciprocated friendships was also predicted by social engagement. These results are discussed from the perspectives of conceptual frameworks that consider individual differences in social competence during early childhood as a consequence of attachment histories and/or emotional competence.  相似文献   
876.
Social Indicators Research - We examine the complex relationship between money and happiness. We find that both permanent income and wealth are better predictors of life satisfaction than current...  相似文献   
877.
Abstract The main trend in urban/rural migration is a continuous gain, in net terms, of towns from villages and large cities. But this is a result of two distinct migration streams associated with the process of family formation. While before marriage there is positive net migration from villages to both large cities and towns (and from large cities towards towns), after marriage there is a tendency for couples to move towards villages. This is explained by the desire of families, particularly those belonging to the middle class to move out of the urban centres to better accommodation in smaller communities. Considerable variations in migrations within and into regions are observed. These reflect the continuation oflong-term trends in internal migration (as described in Part I of this paper) in particular, population dispersal from Greater London and larger distance migration into the Southern and Eastern regions. Some social characteristics of migrants and non-migrants are compared. Associations between the intensity of internal migration on the one hand, and occupational status, education, social mobility and family size on the other are observed. An attempt is made to assess the extent of migration associated with the marriage process. Although this process increases mobility, its relative contribution to total adult mobility appears to be only slight.  相似文献   
878.
Using expected values to simplify decision making under uncertainty   总被引:2,自引:0,他引:2  
Ian N. Durbach  Theodor J. Stewart   《Omega》2009,37(2):312-330
A simulation study examines the impact of a simplification strategy that replaces distributional attribute evaluations with their expected values and uses those expectations in an additive value model. Several alternate simplified forms and approximation approaches are investigated, with results showing that in general the simplified models are able to provide acceptable performance that is fairly robust to a variety of internal and external environmental changes, including changes to the distributional forms of the attribute evaluations, errors in the assessment of the expected values, and problem size. Certain of the simplified models are shown to be highly sensitive to the form of the underlying preference functions, and in particular to extreme non-linearity in these preferences.  相似文献   
879.
This paper studies the graphs for which the linear relaxation of the 2-connected spanning subgraph polyhedron has integer or half-integer extreme points. These graphs are called quasi-integer. For these graphs, the linear relaxation of the k-edge connected spanning subgraph polyhedron is integer for all k=4r, r≥1. The class of quasi-integer graphs is closed under minors and contains for instance the class of series-parallel graphs. We discuss some structural properties of graphs which are minimally non quasi-integer graphs, then we examine some basic operations which preserve the quasi-integer property. Using this, we show that the subdivisions of wheels are quasi-integer.  相似文献   
880.
Philosophy as exercising the shift of perspectives, exemplified with Plato and NietzscheIn professional counselling a shift of perspectives is useful to develop new options of thinking and of action in the case of seemingly hopeless situations. Philosophy presents a great variety of concepts and also of models of change processes, which may offer a resource to counsellors. With regard to Plato’s “cave metaphor” and to Nietzsche’s “transvaluation of all values” the author presents a structure of change in three stages. Concerning the practice of counsellors some relevant aspects are derived from these discussions.  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