全文获取类型
收费全文 | 7443篇 |
免费 | 190篇 |
专业分类
各国政治 | 436篇 |
工人农民 | 325篇 |
世界政治 | 439篇 |
外交国际关系 | 300篇 |
法律 | 4491篇 |
中国共产党 | 10篇 |
中国政治 | 78篇 |
政治理论 | 1387篇 |
综合类 | 167篇 |
出版年
2020年 | 79篇 |
2019年 | 91篇 |
2018年 | 117篇 |
2017年 | 144篇 |
2016年 | 151篇 |
2015年 | 111篇 |
2014年 | 143篇 |
2013年 | 774篇 |
2012年 | 158篇 |
2011年 | 172篇 |
2010年 | 176篇 |
2009年 | 173篇 |
2008年 | 211篇 |
2007年 | 214篇 |
2006年 | 217篇 |
2005年 | 176篇 |
2004年 | 164篇 |
2003年 | 183篇 |
2002年 | 141篇 |
2001年 | 286篇 |
2000年 | 242篇 |
1999年 | 226篇 |
1998年 | 96篇 |
1997年 | 78篇 |
1996年 | 71篇 |
1995年 | 64篇 |
1994年 | 74篇 |
1993年 | 67篇 |
1992年 | 123篇 |
1991年 | 159篇 |
1990年 | 155篇 |
1989年 | 142篇 |
1988年 | 148篇 |
1987年 | 165篇 |
1986年 | 159篇 |
1985年 | 148篇 |
1984年 | 131篇 |
1983年 | 120篇 |
1982年 | 81篇 |
1981年 | 91篇 |
1980年 | 68篇 |
1979年 | 126篇 |
1978年 | 86篇 |
1977年 | 72篇 |
1976年 | 56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7633条查询结果,搜索用时 15 毫秒
331.
332.
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
333.
334.
Hanne Fjelde Håvard Hegre 《Studies in Comparative International Development (SCID)》2014,49(3):267-299
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
335.
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
336.
Sheila K. Marshall Lauree C. Tilton-Weaver Håkan Stattin 《Journal of youth and adolescence》2013,42(8):1234-1242
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
337.
Rajni L. Nair Rebecca M. B. White Mark W. Roosa Katharine H. Zeiders 《Journal of youth and adolescence》2013,42(10):1611-1623
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
338.
Cecilie H⊘igaard 《Nora, Nordic Journal of Women's Studies》2013,21(1):51-64
The article presents a study of the Danish YWCA from 1883 to 1940. The approach adopted is that of cultural analysis, drawing on inspiration from several fields, not least cultural anthropology and so‐called empowerment research (Habermas 1968). The YWCA building in Copenhagen is used as the starting‐point for exploring the YWCA as a culture and for a discussion of the religious, social and feminist issues of the YWCA. 相似文献
339.
儿童社会化中的行为与发展研究范畴,大多局限于儿童的亲社会行为和反社会行为,而忽略了对非社会性行为的研究。非社会性行为,是儿童社会化发展中的重要范畴。典型的非社会性行为主要表现为内向性行为和逃避性行为。虽然它们会随年龄增长而消失,但它们潜隐着问题障碍乃至反社会危机。为此,要充分认识儿童期行为发展的重要性,及时识别与诊断儿童早期行为发展,激活儿童内在的成长机制,尊重与信任儿童的自我建构性发展。要善于挖掘儿童潜能,帮助儿童增添成功体验,让他们发现并创造自己的有价值的生活。 相似文献
340.
白纯 《南京政治学院学报》2000,16(3):63-67
汉奸问题曾一度成为鸦片战争前后中国一个较为突出的社会问题。从受外国侵略者驱使出卖祖国利益的不同行径看,鸦片战争前后的汉奸大致可分成五类即转卖鸦片者、接济逆夷者、煽惑百姓者、充作内应者、贿夷乞降者。清政府对汉奸的防范措施主要有加强对出海民船的管理;严格军队营门管理,实行暗号制度;加大暗查力度等。清政府对汉奸的处置措施主要有就地正法;递回原籍,责令地方官严加管束;“化奸为良”等。 相似文献