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   14878篇
  免费   449篇
各国政治   440篇
工人农民   733篇
世界政治   837篇
外交国际关系   450篇
法律   9863篇
中国共产党   34篇
中国政治   169篇
政治理论   2649篇
综合类   152篇
  2021年   91篇
  2020年   194篇
  2019年   179篇
  2018年   353篇
  2017年   344篇
  2016年   431篇
  2015年   307篇
  2014年   304篇
  2013年   1126篇
  2012年   438篇
  2011年   463篇
  2010年   289篇
  2009年   376篇
  2008年   427篇
  2007年   426篇
  2006年   437篇
  2005年   737篇
  2004年   470篇
  2003年   343篇
  2002年   329篇
  2001年   517篇
  2000年   441篇
  1999年   361篇
  1998年   188篇
  1997年   158篇
  1996年   173篇
  1995年   162篇
  1994年   172篇
  1993年   180篇
  1992年   286篇
  1991年   339篇
  1990年   297篇
  1989年   281篇
  1988年   314篇
  1987年   295篇
  1986年   327篇
  1985年   309篇
  1984年   255篇
  1983年   241篇
  1982年   142篇
  1981年   157篇
  1980年   123篇
  1979年   141篇
  1978年   127篇
  1977年   101篇
  1975年   103篇
  1974年   122篇
  1973年   110篇
  1971年   93篇
  1970年   83篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
951.
In the present longitudinal 3-wave study of 1274 adolescents and young adults, aged 12–24 at the 1st wave, it is examined whether youngsters from intact versus postdivorce families show long-term differences in internalizing and externalizing problems. Furthermore, possible differences in the development of this problem behavior between offspring from intact and postdivorce families are examined, i.e., possible differences in growth curves of internalizing and externalizing problems are investigated. Longitudinal multilevel analyses reveal long-term differences in internalizing and externalizing problems according to family structure. Adolescents and young adults growing up in postdivorce families display more internalizing and externalizing problem behavior than youngsters of intact families. The development of these 2 types of problem behavior does not differ by gender or family structure. That is, the shape of the growth curves of internalizing and externalizing problem behavior is similar for boys and girls and also for youngsters from intact and postdivorce families. Inge VanderValk is a Postdoc Researcher at the Department of Child and Adolescent Studies, Utrecht University, the Netherlands. She received her Ph.D. in 2004 from Utrecht University. Her major research interests include associations between adolescent adjustment and parental marital quality and parental divorce. Ed Spruijt is an Associate Professor at the University of Utrecht. He received his Ph.D. in 1983 from Utrecht University. His major research interests are the consequences of parental divorce and visitation arrangements on children. Martijn de Goede is an associate Professor at Utrecht University, Department of Methodology and Statistics. He received his Ph.D. in 1988 from Utrecht University. His major research interests are occupational and relational life courses of youngsters. Cora Maas is an Assistent Professor at Utrecht University, Department of Methodology and Statistics. She received her PH.D. in 1992 in Utrecht from Utrecht University. Her major interests are: multilevel analysis (theory and applications). Wim Meeus is full Professor of Adolescent Development at Utrecht University. He received his Ph.D. in 1984 from Utrecht University. His major research interests are personality, identity, and relationships in adolescence.  相似文献   
952.
Due to conceptualizations of autonomy as detachment and independence, research on the parenting–autonomy relationship in adolescence has yielded inconsistent results. In the present study, self-determination is proposed as an alternative way of tapping into the construct of autonomy. An integrated model of the relationships between perceived parenting and teaching styles, self-determination in 3 life-domains (school, social competence, and job-seeking behaviors), and specific adolescent outcomes, was investigated and confirmed. In 2 samples of mid-adolescents (N = 328 and N = 285), autonomy-supportive parenting was significantly related to self-determination in all life-domains. Autonomy-supportive teaching added significantly to the prediction of self-determination in the domains of school and job-seeking behaviors. Self-determination, in turn, was positively and specifically associated with measures of adjustment in the specific life-domains under investigation. Finally, in both studies, indications were found that self-determination acts as an intervening variable in the relation between the perceived interpersonal environment and adolescent adjustment. Doctoral student at the Center for Developmental Psychology at the Katholieke Universiteit Leuven, Belgium. His major research interests are parenting, psychological control, and identity development. Postdoctoral researcher at the Center for Motivation Psychology at the Katholieke Universiteit Leuven, Belgium. His major research interests are self-determination theory, motivation, and parenting.  相似文献   
953.
The purpose of this study was to increase the knowledge base of adolescent substance use by examining the influences of risk and protective factors for specific substance use, namely alcohol, cigarettes, and marijuana. Participants included 271 adolescents and their primary caregivers referred for mental health services across North Carolina. A series of hierarchical multiple regressions showed that the relative influences of risk and protective factors differed depending on the target substance in some cases. History of parental felony predicted use of all 3 substances, although the direction of association was substance specific. Parental behavioral control (how families express and maintain standards of behavior) was predictive only of cigarette and marijuana use, not alcohol use. The different links among risk factors, protective factors, and specific substance use are discussed, and recommendations for both mental health and substance use professionals are offered.She received her M.A. in Psychology from Wake Forest University and is currently a doctoral student in Clinical Psychology at the University of North Carolina at Greensboro. Her major research interests include developmental pathways to aggressive behavior among females.An evaluator for the North Carolina Department of Health and Human Services, her major research interests include system of care intervention programming.She received her PhD in Clinical Psychology from Purdue University. Her major research interests include developmental psychopathology and early intervention.His research interests focus on youth violence and youth involved with the juvenile justice system.She received her PhD in Clinical Psychology from the University of North Carolina at Greensboro. Her research interests focus on early intervention with young children.  相似文献   
954.
Within the context of U.K. law, the right to respect for private life, articulated in Article 8 of the European Convention on Human Rights, and acknowledged more opaquely in domestic legislation and case law, is one whose scope is unclear. Nowhere is this brought into sharper relief than in cases where conduct which manifests a person’s sexual identity, or concerns her intimate relations with others, is prima facie criminal. In this essay I attempt, through a discussion of cases in which injury is caused in the context of relationships experienced inter-subjectively as private, to explore the contexts in which the law is prepared to legitimate that inter-subjective experience, and where it is not. Using cases in which injury has been caused purposively (in S/M sex), and incidentally (through the reckless transmission of HIV during sexual intercourse), the essay argues that the law is prepared to respect the right to respect for private life only in so far as the private life concerned is one which reinforces traditional gender roles and relationship types; in short, a life that one would be prepared to live publicly.  相似文献   
955.
Debates concerning the taxation of prostitution have occurred in taxation law and in feminist literature. This article will integrate the case of Polok v. C.E.C. [2002] E.W.H.C, 156; [2002] S.T.C. 361, within the feminist legal canon. The case is discussed in the context of the argument of the European doctrine of fiscal neutrality, which dictates that, regardless of legality as amongst member states, if an activity is levied to V.A.T. in one member state, V.A.T. should be levied on it in all member states. The doctrine of sovereignty accepts the possibility that the integrity of the V.A.T. system may be compromised by the levying of tax on illegal activities, in terms of the cooperation between tax and other aspects of the U.K.’s legal system. European law, feminist law, commodification and the marketplace are all considered within the context of these principles. The article also considers the place of Polok within standard feminist texts on prostitution. Different paradigms of prostitution define different aspects of prostitution as ‘problems’, and the article considers the implications within a feminist reconstruction of Polok of this. The article suggests that the challenge for a feminist analysis of Polok is to remain within the realm of European tax and competition law, and to render the perspective of the employees of the Polok taxpayers part of the substance of the deliberations of the case.  相似文献   
956.
In this article, we test: (a) the relation between school-based extracurricular participation and indicators of positive and negative development across a range of activity contexts, and (b) a mediation model linking activity participation, prosocial peers, and development. Extensive survey information was collected from a predominately White sample of middle class adolescents in 9th, 10th, and 12th grades. Extracurricular participation was related to more favorable academic, psychological, and behavioral adjustment; the pattern of findings differed by activity and outcome. In addition, we documented some support for the hypothesis that the link between extracurricular participation and positive adjustment is partly a function of associating with a prosocial peer group. Implications of these findings and suggestions for future research are presented. Assistant Professor of Human Development, Connecticut College. Received her PhD in 1999 from the University of Michigan. Major research interests include motivation, school engagement, extracurricular participation, and adolescent development. MacKeachie Collegiate Psychology Professor, University of Michigan. Received PhD in 1974 from the UCLA. Recent work focuses on ethnicity and the transitions from middle childhood to adolescence and into adulthood.  相似文献   
957.
958.
This research evaluated a dual pathway model for body dissatisfaction among adolescent boys. The study provides empirical support for the importance of distinguishing between weight and muscularity concerns in understanding male body image. A total of 128 boys from grades 8 and 11 completed a self-report questionnaire. Results indicated that weight and muscularity concerns each made unique contributions to body dissatisfaction and were associated with distinct individual and peer context characteristics. Weight concern was associated with elevated BMI and more frequent appearance conversations with friends. Muscularity concern was significantly greater among boys who reported more frequent muscle-building conversations, had lower BMI, and were older. The results support the importance of distinguishing between and assessing both muscularity and weight concerns in the development of body image dissatisfaction among adolescent boys.  相似文献   
959.
The increasingly global role of a forensic anthropologist necessitates a proper means for archiving evidence for re-examination. Large quantities of evidence can be stored and be made readily accessible through digital imaging. This study focuses on age assessment from digital photographs for personal identity reconstructions. A comparison of 52 Suchey-Brooks scores assigned to digital images and actual bone revealed that age assessment from digital images can be completed with accuracy. Coefficients of concordance imply that there significant agreement between osteological assessment of aging criteria from digital images and direct observation-greater than random change alone (p < 0.05). However, assessments from images should be approached with caution since there are inherent limitations of the naked eye in identifying morphological changes in certain skeletal features, especially where older adults are concerned. Although there is no replacement for a hands-on physical assessment, a digital archive may facilitate the global needs of the forensic anthropologist.  相似文献   
960.
Separation of male and female soft tissue depths into discrete groups for craniofacial identification implies that males and females differ enough from each other, with respect to this application, for this distinction to be useful. In this study, previously published soft tissue depth data were analyzed for sex separation. It was found that the variation within each sex was large while the variation between the sexes was small. Often the value of two standard deviations of the measurement for either sex was larger than the difference displayed between the means of each sex. Furthermore, opposite sex overlap in regions defined to be close to the male or female mean were found to be large and the amount of variance explained by sex was small (less than 6% on average). These results indicate that while male and female means at single craniofacial landmarks may differ slightly, and even at statistically significant levels, individual male and female soft tissue depths are often the same or very similar. On average, soft tissue depths of the face do display some sexual dimorphism but it is not marked and of little practical meaning for craniofacial identification where a single individual must be independently considered. Thus, there is little use in separate reporting of data for males and females and data should be combined to increase sample sizes.  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