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   23929篇
  免费   785篇
  国内免费   5篇
各国政治   1214篇
工人农民   1007篇
世界政治   1721篇
外交国际关系   884篇
法律   14659篇
中国共产党   8篇
中国政治   291篇
政治理论   4682篇
综合类   253篇
  2020年   315篇
  2019年   386篇
  2018年   489篇
  2017年   584篇
  2016年   582篇
  2015年   447篇
  2014年   473篇
  2013年   2472篇
  2012年   645篇
  2011年   751篇
  2010年   578篇
  2009年   604篇
  2008年   686篇
  2007年   717篇
  2006年   694篇
  2005年   627篇
  2004年   626篇
  2003年   688篇
  2002年   560篇
  2001年   932篇
  2000年   808篇
  1999年   708篇
  1998年   376篇
  1997年   257篇
  1996年   296篇
  1995年   260篇
  1994年   294篇
  1993年   286篇
  1992年   451篇
  1991年   480篇
  1990年   459篇
  1989年   392篇
  1988年   453篇
  1987年   402篇
  1986年   446篇
  1985年   409篇
  1984年   360篇
  1983年   347篇
  1982年   249篇
  1981年   248篇
  1980年   198篇
  1979年   252篇
  1978年   191篇
  1977年   168篇
  1976年   157篇
  1975年   171篇
  1974年   175篇
  1973年   144篇
  1972年   148篇
  1969年   144篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
881.
Two cross-sectional studies investigated media influences on adolescents’ substance use and intentions to use substances in the context of exposure to parental and peer risk and protective factors. A total of 729 middle school students (n = 351, 59% female in Study 1; n = 378, 43% female in Study 2) completed self-report questionnaires. The sample in Study 1 was primarily African-American (52%) and the sample in Study 2 was primarily Caucasian (63%). Across the two studies, blocks of media-related cognitions made unique contributions to the prediction of adolescents’ current substance use and intentions to use substances in the future above and beyond self-reported peer and parental influences. Specifically, identification with and perceived similarity to media messages were positively associated with adolescents’ current substance use and intentions to use substances in the future, and critical thinking about media messages and media message deconstruction skills were negatively associated with adolescents’ intention to use substances in the future. Further, peer influence variables (e.g., peer pressure, social norms, peer substance use) acted as risk factors, and for the most part, parental influence variables (e.g., parental pressure to not use, perceived parental reaction) acted as protective factors. These findings highlight the importance of developing an increased understanding of the role of media messages and media literacy education in the prevention of substance use behaviors in adolescence.  相似文献   
882.
The purpose of the present study was to examine relations between adolescents’ social cognitions regarding parenting practices and adolescents’ prosocial behavioral tendencies. A mediation model was tested whereby the degree to which adolescents perceived their parents as responding appropriately to their prosocial and antisocial behaviors was hypothesized to predict adolescents’ tendencies toward prosocial behavior indirectly by way of adolescents’ prosocial values. Adolescents (N = 140; M age = 16.76 years, SD = .80; 64% girls; 91% European Americans) completed measures of prosocial values and of the appropriateness with which they expected their parents to react to their prosocial and antisocial behaviors. In addition, teachers and parents rated the adolescents’ tendencies for prosocial behaviors. A structural equation model test showed that the degree to which adolescents expected their parents to respond appropriately to their prosocial behaviors was related positively to their prosocial values, which in turn was positively associated with their tendencies to engage in prosocial behaviors (as reported by parents and teachers). The findings provide evidence for the central role of adolescents’ evaluations and expectancies of parental behaviors and of the role of values in predicting prosocial tendencies. Discussion focuses on the implications for moral socialization theories and on the practical implications of these findings in understanding adolescents’ prosocial development.  相似文献   
883.
While having a purpose in life has been theorized as a developmental asset, the extent to which adolescents cultivate a meaningful sense of direction is not well understood. In the present study, cluster analysis was used to classify adolescents by levels of purpose exploration and commitment. The sample (N = 318; 55% female) consisted of youth aged 14–18 and was predominantly White/non-Hispanic (76.3%). Results supported four meaningful yet distinguishable profiles of youth purpose that are largely consistent with theories on identity formation: Achieved, Foreclosed, Uncommitted, and Diffused. Hypothesized linkages with affect and hope were established across the profiles such that positive emotions and goal-directed thinking were most apparent among Achieved and Foreclosed youth and least apparent among Diffused and Uncommitted youth. Overall, findings demonstrate the inherent complexity in adolescents’ engagement with purpose and suggest a correspondence between stronger commitments to purpose and youths’ sense of personal agency and well-being.  相似文献   
884.
Scholars of representative bureaucracy have long been interested in the linkage between passive representation in public agencies and the pursuit of specific policies designed to benefit minority groups. Research in this area suggests that the structural characteristics of those organizations, the external political environment, and the perceptions of individual bureaucrats each help to facilitate that relationship. Work to date has not, however, sufficiently investigated the impact of region on representation behavior, which is surprising given the emphasis that it receives in the broader literature on race and politics. Drawing on that literature, this study argues that, for black bureaucrats, region of residence is an important moderator of active representation because it helps to determine the salience of race as an issue and the degree of identification with racial group interests. It tests hypotheses related to that general argument in a nationally representative sample of more than 3,000 public schools. The results suggest that black teachers produce greater benefits for black students in the South, relative to other regions. A supplementary analysis also confirms the theoretical supposition that race is a more salient issue for Southern black bureaucrats, when compared with their non-Southern counterparts.  相似文献   
885.
886.
The riskiness of state employee pension plan portfolios varies across states. We investigate whether this variation is related to how public employees and taxpayers share actuarial surpluses of pension accounts. We focus on two determinants of a plan’s asset mix: the relative influence of public employees to taxpayers; and whether a surplus-sharing contract is specified. Our theoretical model demonstrates that the effect of public employee influence on the asset mix is ambiguous. Our empirical results corroborate this complex theoretical result. In our theoretical and empirical analyses, if a surplus sharing rule is specified, plans adopt a more aggressive investment allocation.  相似文献   
887.
888.
889.
890.
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