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   22884篇
  免费   578篇
各国政治   1075篇
工人农民   893篇
世界政治   1799篇
外交国际关系   833篇
法律   13648篇
中国共产党   2篇
中国政治   110篇
政治理论   4884篇
综合类   218篇
  2020年   272篇
  2019年   329篇
  2018年   419篇
  2017年   510篇
  2016年   534篇
  2015年   375篇
  2014年   447篇
  2013年   2314篇
  2012年   527篇
  2011年   558篇
  2010年   477篇
  2009年   499篇
  2008年   583篇
  2007年   613篇
  2006年   597篇
  2005年   514篇
  2004年   518篇
  2003年   551篇
  2002年   484篇
  2001年   870篇
  2000年   785篇
  1999年   666篇
  1998年   366篇
  1997年   305篇
  1996年   264篇
  1995年   261篇
  1994年   306篇
  1993年   280篇
  1992年   426篇
  1991年   488篇
  1990年   442篇
  1989年   454篇
  1988年   433篇
  1987年   466篇
  1986年   456篇
  1985年   441篇
  1984年   390篇
  1983年   412篇
  1982年   324篇
  1981年   311篇
  1980年   233篇
  1979年   351篇
  1978年   233篇
  1977年   198篇
  1976年   181篇
  1975年   190篇
  1974年   204篇
  1973年   189篇
  1972年   154篇
  1971年   139篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
A reformer most of her life, Lydia Maria Child advanced the rights of women, Native Americans, and African Americans in such works as History of the Condition of Women in Various Ages and Nations (1835), Hobomok (1823), and An Appeal in Favor of That Class of Americans Called Africans (1833).  相似文献   
992.
This paper critically examines theories of accumulation, dispossession and exclusion for analyzing the agrarian transformations that result from contemporary large-scale land acquisitions across the Global South. Building upon Marx's primitive accumulation, Harvey's accumulation by dispossession and Hall et al.'s Powers of Exclusion, conceptual lenses are developed through which to examine how land grabs transform property and social relationships of resource-based production. I examine the concession of 10,000 hectares by the central government of Laos to a Vietnamese corporation for extracting timber and planting rubber in the southern province of Attapeu. This acquisition has excluded farmers from land and resources that constituted their primary sources of (re)production, reconfigured rural property relations, altered the peasant relationship to land and produced new exploitative forms of wage labor.  相似文献   
993.
994.
Since the 1980s, regulated markets and New Public Management have been introduced in the public sector across the world. How they have affected existing governance mechanisms such as self‐regulation and state regulation has remained largely unexplored, however. This article examines the origins and consequences of institutional layering in governing healthcare quality. Dutch health care, where a market‐based system has been introduced, is used as a case study. The results show that this market‐based system did not replace but modified existing institutional arrangements. As a result, hospitals have to deal with the fragmentation of quality demands. Using the concept of institutional layering, this study shows how different arrangements interact. As a consequence, the introduction of a certain policy reform will work out differently in different countries and policy sectors. Our ‘archaeological’ study in this layering can be seen as an example of how such incremental change can be studied in detail.  相似文献   
995.
This article is the first to statistically examine the reciprocal relationship between formal political institutions and political corruption. We argue that political corruption is an informal institution that allows nondemocratic leaders to build political support, act as a substitute for liberalizing concessions in the formal institutions of the state, and thereby extends the longevity of non-democratic regimes. Yet, whereas high corruption level will prevail in nondemocratic regimes, we expect the electoral constituency in democratic regimes to have the formal power to curb political corruption. We demonstrate that these expectations hold by estimating a dynamic multinomial regression model on data for 133 countries for the 1985–2008 period. Our model shows that high-corruption autocracies and hybrid regimes are more stable than their low-corruption counterparts, but that low-corruption democracies are more stable than high-corruption ones. For autocratic and hybrid regimes, the stability is due both to corruption making the formal institutions more resistant to democratization and that the formal institutions prevent reductions in corruption. Consistent democracies, on the other hand, are able to reduce corruption and become more stable as a result.  相似文献   
996.
997.
The United States Supreme Court’s recent decision relating to violent video games revealed divisions within the scientific community about the potential for negative effects of such games as well as the need for more, higher quality research. Scholars also have debated the potential for violent games to have positive effects such as on visuospatial cognition or math ability. The current study sought to extend previous literature by using well-validated clinical outcome measures for relevant constructs, which have generally been lacking in past research. Cross-section data on aggression, visuospatial cognition, and math achievement were available for a sample of 333 (51.7 % female) mostly Hispanic youth (mean age = 12.76). Prospective 1-year data on aggression and school GPA were available for 143 (46.2 % female) of those youth. Results from both sets of analysis revealed that exposure to violent game had neither short-term nor long-term predictive influences on either positive or negative outcomes. A developmental analysis of the cross-sectional data revealed that results did not differ across age categories of older children, preadolescents or adolescents. Analysis of effect sizes largely ruled out Type II error as a possible explanation for null results. Suggestions for new directions in the field of video game research are proffered.  相似文献   
998.
Depression is a common and debilitating disorder in adolescence. Sleep disturbances and depression often co-occur with sleep disturbances frequently preceding depression. The current study investigated whether catastrophic worry, a potential cognitive vulnerability, mediates the relationship between adolescent sleep disturbances and depressive symptoms, as well as whether there are gender differences in this relationship. High school students, ages 16–18, n = 1,760, 49 % girls, completed annual health surveys including reports of sleep disturbance, catastrophic worry, and depressive symptoms. Sleep disturbances predicted depressive symptoms 1-year later. Catastrophic worry partially mediated the relationship. Girls reported more sleep disturbances, depressive symptoms, and catastrophic worry relative to boys. The results, however, were similar regardless of gender. Sleep disturbances and catastrophic worry may provide school nurses, psychologists, teachers, and parents with non-gender specific early indicators of risk for depression. Several potentially important practical implications, including suggestions for intervention and prevention programs, are highlighted.  相似文献   
999.
As a time of notably increased stress and a marked rise in depressive symptoms, adolescence is a key period in which to examine how stress is related to mental health outcomes. Many studies examine stress as a unitary construct; however, research suggests that how adolescents respond to stress within different domains may differentially predict depression. The current study used an 8-week weekly diary design to assess how adolescents’ cognitive appraisals, rumination, and co-rumination in response to dependent, independent, social, and nonsocial stressors differentially predicted depressive symptoms. Participants were 111 high school students (72 % female) ages 14–19 years (mean age 16.4). Results indicated that rumination and co-rumination about dependent and social events, rather than independent or nonsocial events, prospectively predicted depressive symptoms. Negative cognitive appraisals prospectively predicted depressive symptoms regardless of domain. This study provides support for the hypothesis that adolescents’ responses to stress in different domains differentially predict depressive symptoms.  相似文献   
1000.
Previous research has shown a consistent positive association between non-suicidal self-injury and depressive symptoms. However, the direction of the effects has not been examined. To understand whether non-suicidal self-injury predicts depressive symptoms or vice versa, we examined the relations between non-suicidal self-injury and depressive symptoms across three waves of self-report data collected 1 year apart from 506 Swedish adolescents (47 % girls; M age = 13.21; SD = .57) who were attending 7th grade at the onset of the study. The results suggest that depressive symptoms predict increases in non-suicidal self-injury 1 year later between the first and second waves of the study. Between the second and third waves of the study depressive symptoms and non-suicidal self-injury were significantly correlated indicating co-occurrence with no direction of effect rather than depressive symptoms predicting non-suicidal self-injury or vice versa. Group comparisons revealed no differences for boys and girls. The findings help clarify the relationships between non-suicidal self-injury and depressive symptoms during middle adolescence.  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