全文获取类型
收费全文 | 6672篇 |
免费 | 220篇 |
国内免费 | 5篇 |
专业分类
6897篇 |
出版年
2019年 | 77篇 |
2018年 | 127篇 |
2017年 | 108篇 |
2016年 | 109篇 |
2015年 | 91篇 |
2014年 | 106篇 |
2013年 | 519篇 |
2012年 | 202篇 |
2011年 | 188篇 |
2010年 | 101篇 |
2009年 | 123篇 |
2008年 | 171篇 |
2007年 | 175篇 |
2006年 | 154篇 |
2005年 | 141篇 |
2004年 | 150篇 |
2003年 | 117篇 |
2002年 | 132篇 |
2001年 | 231篇 |
2000年 | 225篇 |
1999年 | 162篇 |
1998年 | 67篇 |
1997年 | 68篇 |
1996年 | 70篇 |
1993年 | 64篇 |
1992年 | 132篇 |
1991年 | 135篇 |
1990年 | 122篇 |
1989年 | 107篇 |
1988年 | 93篇 |
1987年 | 102篇 |
1986年 | 115篇 |
1985年 | 122篇 |
1984年 | 107篇 |
1983年 | 94篇 |
1981年 | 59篇 |
1979年 | 97篇 |
1978年 | 82篇 |
1977年 | 69篇 |
1975年 | 70篇 |
1974年 | 103篇 |
1973年 | 108篇 |
1972年 | 76篇 |
1971年 | 72篇 |
1970年 | 81篇 |
1969年 | 78篇 |
1968年 | 109篇 |
1967年 | 86篇 |
1966年 | 96篇 |
1958年 | 62篇 |
排序方式: 共有6897条查询结果,搜索用时 15 毫秒
961.
Miguel Ángel Cano Yessenia Castro Marcel A. de Dios Seth J. Schwartz Elma I. Lorenzo-Blanco Angelica M. Roncancio 《Anxiety, stress, and coping》2016,29(6):699-707
Background and Objectives: Emerging adulthood is often marked with elevated symptoms of anxiety and depression. Hispanic emerging adults may face cultural stressors such as ethnic discrimination that further increase levels of anxiety and depression symptoms. The study aims were to examine if (a) self-esteem mediated effects of ethnic discrimination on symptoms of anxiety and depression, and (b) if gender moderated the indirect effects of discrimination. Design: The study design was cross-sectional self-report. Method: Two moderated mediation models were tested, with 1084 Hispanic emerging adults (ages 18–25) enrolled in institutions of post-secondary in the United States. Results: Results indicated that (a) higher ethnic discrimination was associated with higher anxiety symptoms (β?=?.05, p?=?.04), higher depression symptoms (β?=?.06, p?=?.02), and lower self-esteem (β?=??.30, p?.001); (b) self-esteem mediated the associations of ethnic discrimination with anxiety and depression symptoms; and (c) gender moderated the indirect effects of discrimination, whereby self-esteem was a stronger mediator among men than women. Each moderated mediation model explained 26% of variability in symptoms of anxiety and depression, respectively. Conclusions: Findings suggest that the mediating effects of self-esteem linking ethnic discrimination with symptoms of anxiety and depression vary between genders. 相似文献
962.
Despite the essential role of food in our lives, we have little understanding of the way our knowledge about food is organized in the brain. At birth, human infants exhibit very few food preferences, and do not yet know much about what is edible and what is not. A multisensory learning development will eventually turn young infants into omnivore adults, for whom deciding what to eat becomes an effortful task. Recognizing food constitutes an essential step in this decisional process. In this paper we examine how concepts about food are represented in the human brain. More specifically, we first analyze how brain-damaged patients recognize natural and manufactured food, and then examine these patterns in the light of the sensory-functional hypothesis and the domain-specific hypothesis. Secondly, we discuss how concepts of food are represented depending on whether we embrace the embodied view or the disembodied view. We conclude that research on food recognition and on the organization of knowledge about food must also take into account some aspects specific to food category, the relevance of which has not been sufficiently recognized and investigated to date. 相似文献
963.
Rebecca S. Robinson 《文化与宗教》2016,17(3):332-351
While the initial purpose of this article was to outline online collective action (OCA) towards promoting the rights of hijab-wearing Muslim women in the workplace, it became apparent that there were substantial impediments to this solidarity. Thus, the bulk of it takes up these obstacles, arguing that American hijabis face structural discrimination and Muslims in the United States are subjected to heightened discrimination when they are highly visible to the mainstream culture. This article reviews two cases of workplace discrimination against hijabis and the reactions to these incidents on the Huffington Post, Los Angeles Times, and hijab-oriented blogs. Findings indicate that intolerance of Muslims is prevalent across various political affiliations and apprehension associated with hijabi rights could be related to the perceived decline of white privilege. The analysis also demonstrates that there may be impediments to solidarity with hijabi rights within Muslim communities due to disagreements on the Qur’anic mandate of modesty, divergent perspectives on how Muslims can best promote their rights and ensure their safety, and misunderstandings related to the rights guaranteed under reasonable accommodation. Despite the various obstacles to solidarity with hijabis, the article traces various forms of OCA at local, national and international levels that were encountered on social media platforms. 相似文献
964.
Estíbaliz Aragón José I. Navarro Manuel Aguilar Gamal Cerda Manuel García‐Sedeño 《Scandinavian journal of psychology》2016,57(6):489-494
Early math skills are determined by higher cognitive processes that are particularly important for acquiring and developing skills during a child's early education. Such processes could be a critical target for identifying students at risk for math learning difficulties. Few studies have considered the use of a structural equation method to rationalize these relations. Participating in this study were 207 preschool students ages 59 to 72 months, 108 boys and 99 girls. Performance with respect to early math skills, early literacy, general intelligence, working memory, and short‐term memory was assessed. A structural equation model explaining 64.3% of the variance in early math skills was applied. Early literacy exhibited the highest statistical significance (β = 0.443, p < 0.05), followed by intelligence (β = 0.286, p < 0.05), working memory (β = 0.220, p < 0.05), and short‐term memory (β = 0.213, p < 0.05). Correlations between the independent variables were also significant (p < 0.05). According to the results, cognitive variables should be included in remedial intervention programs. 相似文献
965.
Parental Monitoring,Association with Externalized Behavior,and Academic Outcomes in Urban African‐American Youth: A Moderated Mediation Analysis 下载免费PDF全文
Roberto Lopez‐Tamayo W. LaVome Robinson Sharon F. Lambert Leonard A. Jason Nicholas S. Ialongo 《American journal of community psychology》2016,57(3-4):366-379
African‐American adolescents exposed to neighborhood disadvantage are at increased risk for engaging in problem behavior and academic underachievement. It is critical to identify the mechanisms that reduce problem behavior and promote better academic outcomes in this population. Based on social disorganization and socioecological theories, the current prospective study examined pathways from parental monitoring to academic outcomes via externalizing behavior at different levels of neighborhood disadvantage. A moderated mediation model employing maximum likelihood was conducted on 339 African‐American students from 9th to 11th grade (49.3% females) with a mean age of 14.8 years (SD ± 0.35). The results indicated that parental monitoring predicted low externalizing behavior, and low externalizing behavior predicted better academic outcomes after controlling for externalizing behavior in 9th grade, intervention status, and gender. Mediation was supported, as the index of mediation was significant. Conversely, neighborhood disadvantage did not moderate the path from parental monitoring to externalizing behavior. Implications for intervention at both community and individual levels and study limitations are discussed. 相似文献
966.
967.
K.J. Glasheen I. Shochet M.A. Campbell 《British Journal of Guidance & Counselling》2016,44(1):108-122
Students in secondary schools experience problems that can impact on their well-being and educational outcomes. Although face-to-face counselling is available in most Australian secondary schools, many students, particularly boys, do not seek appropriate help. Research suggests that online counselling can be effective and increase engagement. This study of 215 secondary school students sought to assess students' intention to use online counselling if it was made available in schools. The results found no gender difference in the likely intentions to seek online help though year level was significant and students experiencing psychological distress had a preference for online counselling. If students did use online counselling it was more likely they would discuss sensitive topics rather than for career issues. Implications for school counselling are discussed. 相似文献
968.
Prior reports of preferential detection of emotional expressions in visual search have yielded inconsistent results, even for face stimuli that avoid obvious expression-related perceptual confounds. The current study investigated inconsistent reports of anger and happiness superiority effects using face stimuli drawn from the same database. Experiment 1 excluded procedural differences as a potential factor, replicating a happiness superiority effect in a procedure that previously yielded an anger superiority effect. Experiments 2a and 2b confirmed that image colour or poser gender did not account for prior inconsistent findings. Experiments 3a and 3b identified stimulus set as the critical variable, revealing happiness or anger superiority effects for two partially overlapping sets of face stimuli. The current results highlight the critical role of stimulus selection for the observation of happiness or anger superiority effects in visual search even for face stimuli that avoid obvious expression related perceptual confounds and are drawn from a single database. 相似文献
969.
This study examined the effect of a prior bout of exercise on implicit cognition. Specifically, we examined whether a prior bout of moderate intensity exercise affected performance on a statistical learning task in healthy adults. A total of 42 participants were allocated to one of three conditions—a control group, a group that exercised for 15 min prior to the statistical learning task, and a group that exercised for 30 min prior to the statistical learning task. The participants in the exercise groups cycled at 60% of their respective O2max. Each group demonstrated significant statistical learning, with similar levels of learning among the three groups. Contrary to previous research that has shown that a prior bout of exercise can affect performance on explicit cognitive tasks, the results of the current study suggest that the physiological stress induced by moderate‐intensity exercise does not affect implicit cognition as measured by statistical learning. 相似文献
970.
Barry J. Devereux Kirsten I. Taylor Billi Randall Jeroen Geertzen Lorraine K. Tyler 《Cognitive Science》2016,40(2):325-350
Understanding spoken words involves a rapid mapping from speech to conceptual representations. One distributed feature‐based conceptual account assumes that the statistical characteristics of concepts’ features—the number of concepts they occur in (distinctiveness/sharedness) and likelihood of co‐occurrence (correlational strength)—determine conceptual activation. To test these claims, we investigated the role of distinctiveness/sharedness and correlational strength in speech‐to‐meaning mapping, using a lexical decision task and computational simulations. Responses were faster for concepts with higher sharedness, suggesting that shared features are facilitatory in tasks like lexical decision that require access to them. Correlational strength facilitated responses for slower participants, suggesting a time‐sensitive co‐occurrence‐driven settling mechanism. The computational simulation showed similar effects, with early effects of shared features and later effects of correlational strength. These results support a general‐to‐specific account of conceptual processing, whereby early activation of shared features is followed by the gradual emergence of a specific target representation. 相似文献