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   7615篇
  免费   205篇
各国政治   467篇
工人农民   346篇
世界政治   467篇
外交国际关系   293篇
法律   4662篇
中国政治   41篇
政治理论   1495篇
综合类   49篇
  2020年   80篇
  2019年   102篇
  2018年   151篇
  2017年   176篇
  2016年   172篇
  2015年   125篇
  2014年   160篇
  2013年   840篇
  2012年   169篇
  2011年   180篇
  2010年   170篇
  2009年   158篇
  2008年   194篇
  2007年   213篇
  2006年   202篇
  2005年   161篇
  2004年   157篇
  2003年   179篇
  2002年   138篇
  2001年   287篇
  2000年   242篇
  1999年   231篇
  1998年   97篇
  1997年   85篇
  1996年   72篇
  1995年   66篇
  1994年   76篇
  1993年   68篇
  1992年   123篇
  1991年   159篇
  1990年   156篇
  1989年   146篇
  1988年   150篇
  1987年   165篇
  1986年   159篇
  1985年   151篇
  1984年   134篇
  1983年   128篇
  1982年   81篇
  1981年   94篇
  1980年   68篇
  1979年   127篇
  1978年   87篇
  1977年   74篇
  1976年   58篇
  1975年   81篇
  1974年   86篇
  1973年   82篇
  1972年   56篇
  1971年   57篇
排序方式: 共有7820条查询结果,搜索用时 15 毫秒
261.
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   
262.
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   
263.
Studies of stress consistently have linked individuals’ experiences of stress to maladjustment, but limited attention has been given to cultural stressors commonly experienced by minority individuals. To address this, the current study examined the links between cultural stressors and prospective changes in mental health symptoms in a sample of 710 (49 % female) Mexican American youth. In addition, the moderating role of both family and neighborhood cohesion was examined. In-home interviews were completed with youth, mothers (required) and fathers (optional) to collect data on youth’s experiences of cultural stressors (discrimination and language hassles) and internalizing/externalizing behavior, and mothers’ report of family cohesion and mothers’ and fathers’ report of neighborhood cohesion. Analyses revealed that youth’s experiences of discrimination and language hassles at 5th grade were related positively to increases in internalizing symptoms at 7th grade. Additionally, youths who reported higher levels of language hassles in 5th grade experienced increases in externalizing symptoms across the 2-year span. Both family and neighborhood cohesion emerged as significant moderating factors but their impact was conditional on youth’s gender and nativity. Limitations and future implications are discussed.  相似文献   
264.
This article argues that if the introduction of genetically modified crops (GM crops) in developing countries is to be successful, we can and should not evade questions of access and control of technology. It implies probing into the experiences, perceptions and understanding of GM crops by the prime user: the farmer. Exactly in these respects the scholarly literature is remarkably silent. We know little about farmers' experiences and perceptions of GM crops' potential risks and benefits. This is evident when concentrating on a major GM crop – Bt cotton – and studying this in the context of China, its second largest producer in the world. Based on the results of a large survey, we demonstrate that Chinese farmers' awareness (‘having heard of’) and their understanding (‘being able to explain’) of Bt cotton is low. This may lead to ill-informed, distorted risk perceptions and a general inability to relate agricultural production problems to the specific nature of transgenic cotton cultivation. A great majority of the farmers find that the Chinese seed market was liberalised too early, in turn leading to a high incidence of ‘stealth transgenics’ or illegal seeds, the undermining of farmers' trust in private institutions, and a weakened biosafety regime. This finding points to the need for continued state intervention in the seed market, particularly in a developing context. Finally, we have discovered that farmers report a significantly lower reduction in pesticide use by Bt cotton than found in other studies. As suggested by recent research, we suspect that the higher pesticide use is necessary to control secondary pests – i.e. pests other than the cotton bollworm. We present empirical evidence that Chinese farmers perceive a substantive increase in secondary pests after Bt cotton was introduced.  相似文献   
265.
The paper examines how the tiny ethno-cultural group of Setos constructs its identity in the multicultural context. The study examines the validity of three acculturation models and tests earlier findings on the relationship between identity and well-being. The results suggest that Setos have clearly adopted a multicultural identity strategy while not merging different identities, and that they have managed to separate the material well-being from the pride of their identity. Despite its small size and peripheral location, the Setos' way to preserve their identity in a constantly changing context is an interesting lesson for other indigenous groups, and also for bigger neighbors.  相似文献   
266.
267.
268.
269.
270.
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