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Adam Czornik 《Journal of The Franklin Institute》2010,347(2):502-507
In this paper we introduce certain constants that characterize exponential stability or exponential unstability of discrete linear time varying systems. We also present bounds for Lyapunov and Perron exponents in terms of the introduced constants. 相似文献
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Peer Group Norms and Accountability Moderate the Effect of School Norms on Children's Intergroup Attitudes 下载免费PDF全文
The present study examined the interactive effects of school norms, peer norms, and accountability on children's intergroup attitudes. Participants (n = 229) aged 5–11 years, in a between‐subjects design, were randomly assigned to a peer group with an inclusion or exclusion norm, learned their school either had an inclusion norm or not, and were accountable to either their peer group, teachers, or nobody. Findings indicated, irrespective of age, that an inclusive school norm was less effective when the peer group had an exclusive norm and children were held accountable to their peers or teachers. These findings support social identity development theory (D. Nesdale, 2004, 2007), which expects both the in‐group peer and school norm to influence children's intergroup attitudes. 相似文献
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Donald Simpson Eunice Lumsden Rory McDowall Clark 《Early Years: An International Journal of Research and Development》2015,35(1):96-109
The global rise of a neoliberal ‘new politics of parenting’ discursively constructs parents in poverty as the reason for, and remedy to, child poverty. This allows for Early Childhood Education and Care (ECEC) to become a key policy lever by using human technologies to intervene in and regulate the lives of parents and children in poverty. The article explores the uptake of this policy locally through interviews with 30 ECEC practitioners in three locations across England. The interviews suggested that the neoliberal discursive formation of child poverty as a problem of the poor themselves had symbolic power and was a view shared by most of the interviewees. This appeared to restrict their thinking and action, shaping a limited engagement with parents in poverty. Delivering curricular requirements was seen to further delimit practitioners’ practices with children in poverty by reducing their poverty sensitivity. Although this is a small study, its findings may be of value in questioning neoliberal logics, and their implications are considered critically. 相似文献
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Bullying has been the topic of much debate and empirical investigations over the past decade. Contemporary literature contends that students with disabilities may be overrepresented within the bullying dynamic as both perpetrators and victims. Unfortunately, prevalence rates associated with the representation of students with disabilities is limited due to measurement, disability status identification, and definition issues. The present study attempted to address these issues by assessing the prevalence rates of specific subgroups of students with disabilities in a large‐scale cross‐sectional study with 13,325 students without disabilities and 1,183 students with disabilities in Grades 6 through 12. Results suggest that overall, students with disabilities reported proportionally higher rates of bullying, fighting, relational aggression, victimization, online victimization, and relational victimization than did their peers without disabilities. These findings suggest that schools must begin to establish targeted interventions to support skill development based on characteristics associated with specific disability identification. 相似文献
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Nuria Calet Nicolás Gutiérrez-Palma Ian C. Simpson M. Carmen González-Trujillo Sylvia Defior 《Scientific Studies of Reading》2015,19(1):51-71
Previous studies implicate suprasegmental phonology in reading acquisition. However, little is known about how suprasegmental sensitivity develops or how it contributes to reading. Here, 130 Spanish primary-school children participated in this 2-year longitudinal study. Nonlinguistic rhythm, lexical-stress sensitivity and metrical-stress sensitivity, along with phonological awareness, vocabulary, nonverbal intelligence, and reading aloud, were assessed on five occasions. Results suggest that prosody abilities have different developmental trajectories and that prosody explains unique variance in reading beyond that explained by other factors. There was some evidence that the contribution of each prosody skill occurred at different phases in reading development. Nonlinguistic rhythm, lexical-stress sensitivity, and metrical-stress sensitivity assessed at the end of kindergarten, the start of Grade 1, and the end of Grade 1, respectively, predicted reading performance 6 months later. Nevertheless, sample size and reliability temper the conclusions that can be made. The implications of prosody skills for literacy development are discussed. 相似文献