全文获取类型
收费全文 | 3889篇 |
免费 | 137篇 |
专业分类
4026篇 |
出版年
2022年 | 20篇 |
2021年 | 22篇 |
2020年 | 49篇 |
2019年 | 64篇 |
2018年 | 86篇 |
2017年 | 82篇 |
2016年 | 95篇 |
2015年 | 85篇 |
2014年 | 86篇 |
2013年 | 387篇 |
2012年 | 166篇 |
2011年 | 164篇 |
2010年 | 128篇 |
2009年 | 123篇 |
2008年 | 174篇 |
2007年 | 199篇 |
2006年 | 150篇 |
2005年 | 132篇 |
2004年 | 137篇 |
2003年 | 151篇 |
2002年 | 151篇 |
2001年 | 80篇 |
2000年 | 61篇 |
1999年 | 82篇 |
1998年 | 68篇 |
1997年 | 60篇 |
1996年 | 63篇 |
1995年 | 45篇 |
1994年 | 49篇 |
1993年 | 45篇 |
1992年 | 63篇 |
1991年 | 48篇 |
1990年 | 50篇 |
1989年 | 39篇 |
1988年 | 37篇 |
1987年 | 36篇 |
1986年 | 39篇 |
1985年 | 41篇 |
1984年 | 56篇 |
1983年 | 40篇 |
1982年 | 53篇 |
1981年 | 43篇 |
1980年 | 33篇 |
1979年 | 36篇 |
1978年 | 23篇 |
1977年 | 33篇 |
1976年 | 34篇 |
1975年 | 17篇 |
1974年 | 23篇 |
1973年 | 15篇 |
排序方式: 共有4026条查询结果,搜索用时 15 毫秒
971.
Ira G. Federspiel Alexis Garland David Guez Thomas Bugnyar Susan D. Healy Onur Güntürkün Andrea S. Griffin 《Animal cognition》2017,20(1):65-74
Establishment in urbanized environments is associated with changes in physiology, behaviour, and problem-solving. We compared the speed of learning in urban and rural female common mynas, Acridotheres tristis, using a standard visual discrimination task followed by a reversal learning phase. We also examined how quickly each bird progressed through different stages of learning, including sampling and acquisition within both initial and reversal learning, and persistence following reversal. Based on their reliance on very different food resources, we expected urban mynas to learn and reversal learn more quickly but to sample new contingencies for proportionately longer before learning them. When quantified from first presentation to criterion achievement, urban mynas took more 20-trial blocks to learn the initial discrimination, as well as the reversed contingency, than rural mynas. More detailed analyses at the level of stage revealed that this was because urban mynas explored the novel cue-outcome contingencies for longer, and despite transitioning faster through subsequent acquisition, remained overall slower than rural females. Our findings draw attention to fine adjustments in learning strategies in response to urbanization and caution against interpreting the speed to learn a task as a reflection of cognitive ability. 相似文献
972.
Associations of non‐symbolic and symbolic numerical magnitude processing with mathematical competence: a meta‐analysis 下载免费PDF全文
Michael Schneider Kassandra Beeres Leyla Coban Simon Merz S. Susan Schmidt Johannes Stricker Bert De Smedt 《Developmental science》2017,20(3)
Many studies have investigated the association between numerical magnitude processing skills, as assessed by the numerical magnitude comparison task, and broader mathematical competence, e.g. counting, arithmetic, or algebra. Most correlations were positive but varied considerably in their strengths. It remains unclear whether and to what extent the strength of these associations differs systematically between non‐symbolic and symbolic magnitude comparison tasks and whether age, magnitude comparison measures or mathematical competence measures are additional moderators. We investigated these questions by means of a meta‐analysis. The literature search yielded 45 articles reporting 284 effect sizes found with 17,201 participants. Effect sizes were combined by means of a two‐level random‐effects regression model. The effect size was significantly higher for the symbolic (r = .302, 95% CI [.243, .361]) than for the non‐symbolic (r = .241, 95% CI [.198, .284]) magnitude comparison task and decreased very slightly with age. The correlation was higher for solution rates and Weber fractions than for alternative measures of comparison proficiency. It was higher for mathematical competencies that rely more heavily on the processing of magnitudes (i.e. mental arithmetic and early mathematical abilities) than for others. The results support the view that magnitude processing is reliably associated with mathematical competence over the lifespan in a wide range of tasks, measures and mathematical subdomains. The association is stronger for symbolic than for non‐symbolic numerical magnitude processing. So symbolic magnitude processing might be a more eligible candidate to be targeted by diagnostic screening instruments and interventions for school‐aged children and for adults. 相似文献
973.
Daeun Park Marjorie W. Schaeffer Kyle M. Nolla Susan C. Levine Sian L. Beilock 《Developmental science》2017,20(2)
Generic statements about the abilities of children's social groups (e.g. ‘Girls/Boys are good at this game’) negatively impact children's performance – even if the statements are favorable towards children's own social groups. We explored the mechanism by which generic language impairs children's performance. Across three studies, our findings suggest that generic statements influence children's performance by creating an entity belief (i.e. a belief that a fixed ability determines performance). Children who were exposed to a generic statement about their social group's ability performed worse than children in control conditions. This effect hurt children's performance even when the person who made the generic statement was no longer present and a new person not privy to the statement replaced them. However, when children heard a generic statement paired with an effort explanation (i.e. ‘Girls/Boys are good at this game because they try really hard when they draw’) they performed better than children who heard the generic statement with no explanation (i.e. just ‘Girls/Boys are good at this game’) and children who heard the generic statement paired with a trait explanation (i.e. ‘Girls/Boys are good at this game because they are smart and really good at drawing’). This work uncovers when and how generic statements that refer to the ability of one's social group hinder performance, informing the development of practices to improve student motivation and learning. 相似文献
974.
Applying organizational justice theory to admission into higher education: Admission from a student perspective 下载免费PDF全文
A. Susan M. Niessen Rob R. Meijer Jorge N. Tendeiro 《International Journal of Selection & Assessment》2017,25(1):72-84
Applicant perceptions of methods used in admission procedures to higher education were investigated using organizational justice theory. Applicants to a psychology study program completed a questionnaire about several admission methods. General favorability, ratings on justice dimensions, relationships between general favorability and these dimensions, and differences in perceptions based on gender and on the aim of the admission procedure (selection or matching) were studied. In addition, the relationship between favorability and test performance, and the relationship between favorability and behavioral outcomes were investigated. Applicants rated interviews and trial‐studying tests most favorably. Contrary to expectations based on the existing literature, high school grades were perceived least favorably and there was no relationship between applicant perceptions and enrollment decisions. In line with previous research in the employment literature, general favorability was most strongly related to face validity, study‐relatedness, applicant differentiation, the chance to show skills, perceived scientific evidence, and perceived wide‐spread use. We found no differences in applicant perceptions based on gender and small differences based on the aim of admission procedures. These results extend the applicant perceptions literature to educational admission and the results are useful for administrators when choosing methods to admit students. 相似文献
975.
Sandy Goldberg 《Philosophy and phenomenological research》2015,91(2):273-302
The aim of this paper is to defend a novel characterization of epistemic luck. Helping myself to the notions of epistemic entitlement and adequate explanation, I propose that a true belief suffers from epistemic luck iff an adequate explanation of the fact that the belief acquired is true must appeal to propositions to which the subject herself is not epistemically entitled (in a sense to be made clear below). The burden of the argument is to show that there is a plausible construal of the notions of epistemic entitlement and adequate explanation on which the resulting characterization of epistemic luck, though admittedly programmatic, has several important virtues. It avoids difficulties which plague modal accounts of epistemic luck; it can explain the conflicting temptations one can feel in certain alleged cases of epistemic luck; it offers a novel account of the value of knowledge, without committing itself to any particular analysis of knowledge; and it illuminates the significance for epistemology of the phenomenon of epistemic luck itself. 相似文献
976.
Delving into the ‘emotional storms’: A thematic analysis of psychoanalysts’ initial consultation reports 下载免费PDF全文
Alejandra Pérez Penelope Crick Susan Lawrence 《The International journal of psycho-analysis》2015,96(3):659-680
Psychoanalysts’ written reports on initial consultations are a window into the complexities of a crucial aspect of psychoanalytic work. However, systematic research in this area has largely focused on patients’ demographic factors or standardized measures. The present study looked at reports of all the consultations taking place at the London Clinic of Psychoanalysis over one calendar year (N = 100). The aim was to explore psychoanalysts’ different explicit styles of working and reporting as well as further understanding implicit processes used in thinking and writing about each particular consultation experience. A thematic analysis revealed a set of themes that related to a style of working and thinking about the consultation process as a dyadic experience, where the interaction, affective reactions and contact made between the two are the focus when thinking of making a recommendation for psychoanalysis. The majority of the reports had an open, exploratory quality. The writing of reports appears to give the analyst an opportunity to process the consultation experience and arrive at a more triangular position. Writing reports is a more valuable part of the consultation process than has formally been recognized and acknowledged. The limitations of this study as well as the relevance of these findings for future research are discussed. 相似文献
977.
Martha Givaudan Fons J. R. Van de Vijver Ype H. Poortinga Iwin Leenen Susan Pick 《Journal of applied social psychology》2007,37(6):1141-1162
A school‐based life skills and sexuality education HIV/AIDS program for adolescents was evaluated in Toluca, Mexico, through a quasi‐experimental pre–post design with 1,566 cases, divided over a control group and an experimental group. Based on a previously tested path model, 3 levels of variables were included as a guide for the contents of the program: personal variables (self‐knowledge, self‐efficacy regarding condom use, and decision making), intervening variables (subjective norms about, knowledge about HIV/AIDS, and attitudes toward condoms), and outcome variables (communication on sexuality and intentions to use condoms). Evaluation was conducted following these categories. Significant increases in all of these variables recognized as precursors of safer sex were found in the experimental group. 相似文献
978.
Strength and vulnerability integration: a model of emotional well-being across adulthood 总被引:1,自引:0,他引:1
Charles ST 《Psychological bulletin》2010,136(6):1068-1091
The following article presents the theoretical model of strength and vulnerability integration (SAVI) to explain factors that influence emotion regulation and emotional well-being across adulthood. The model posits that trajectories of adult development are marked by age-related enhancement in the use of strategies that serve to avoid or limit exposure to negative stimuli but by age-related vulnerabilities in situations that elicit high levels of sustained emotional arousal. When older adults avoid or reduce exposure to emotional distress, they often respond better than younger adults; when they experience high levels of sustained emotional arousal, however, age-related advantages in emotional well-being are attenuated, and older adults are hypothesized to have greater difficulties returning to homeostasis. SAVI provides a testable model to understand the literature on emotion and aging and to predict trajectories of emotional experience across the adult life span. 相似文献
979.
Children with pre‐ or perinatal brain injury (PL) exhibit marked plasticity for language learning. Previous work has focused mostly on the emergence of earlier‐developing skills, such as vocabulary and syntax. Here we ask whether this plasticity for earlier‐developing aspects of language extends to more complex, later‐developing language functions by examining the narrative production of children with PL. Using an elicitation technique that involves asking children to create stories de novo in response to a story stem, we collected narratives from 11 children with PL and 20 typically developing (TD) children. Narratives were analysed for length, diversity of the vocabulary used, use of complex syntax, complexity of the macro‐level narrative structure and use of narrative evaluation. Children’s language performance on vocabulary and syntax tasks outside the narrative context was also measured. Findings show that children with PL produced shorter stories, used less diverse vocabulary, produced structurally less complex stories at the macro‐level, and made fewer inferences regarding the cognitive states of the story characters. These differences in the narrative task emerged even though children with PL did not differ from TD children on vocabulary and syntax tasks outside the narrative context. Thus, findings suggest that there may be limitations to the plasticity for language functions displayed by children with PL, and that these limitations may be most apparent in complex, decontextualized language tasks such as narrative production. 相似文献
980.
Stigmatization is often listed as one of the adverse consequences of parental incarceration; yet, there is very little research
on this phenomenon. We address this knowledge deficit by providing a conceptual model of stigmatization and describing how
it may apply to children with parents in jail or prison. This model helps to explain why families conceal the fact that a
child’s parent is incarcerated; the potentially protective function of social withdrawal; possible links between stigmatization
and childhood emotional and behavioral problems; how fear of stigmatization may impede help seeking; and the possibility for
research and advocacy to contribute to the stigmatization of children who experience parental incarceration. It also helps
to define specific aspects of stigmatization requiring further study. 相似文献