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Resistance to extinction as a function of percentage of reward: A reinforcement-level interpretation
Jeffrey A. Seybert Lisa P. Baer Robert J. Harvey Kurt Ludwig Ivan C. Gerard 《Learning & behavior》1979,7(2):233-238
Three experiments investigated the effects of percentage of reinforcement on the resistance to extinction of an instrumental running response. In Experiment 1, with N-length held constant, 47% reinforcement during acquisition generated greater resistance to extinction (Rn) than did 77%. In Experiment 2, this result was replicated with both functional N-length and number of N-R transitions held constant. In Experiment 3, Rn was shown to be a function of both N-length and percentage of reinforcement. The results of all three experiments were discussed in terms of Capaldi’s reinforcement level theory and possible alternative explanations. 相似文献
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Sasha A. Barab Kurt D. Squire William Dueber 《Educational technology research and development : ETR & D》2000,48(2):37-62
The purpose of this study was to share our experiences using emerging technologies to create an authentic learning context where preservice teachers at a university and practicing K-12 teachers collaborate in the conduct of real-world (as opposed to textbook) tasks. In this paper, we demonstrate and evaluate the design of professional development that involved a partnership between two universities and eight surrounding K-12 schools. This partnership provides the foundation for supporting a learning community of preservice and practicing teachers that situates in collaborative practices that are both authentic and valuable to all involved. Specifically, we studied how issues of ownership, power, authenticity, and collaboration contribute to students' successes and the success of the program through four case studies. We also explored how asynchronous conferencing tools might be used to facilitate communication across geographic and chronological boundaries, breaking down traditional barriers to distributed communities of practice and making possible the creation of a co-evolutionary model for supporting the emergence of a context that was authentic to both preservice and in-service teachers. In contrast to claims that suggest authenticity for an individual can be prescribed to a learner by the instructor, we deny the legitimacy of preauthentication. Instead, an assumption underlying this research is that authenticity is an emergent process that is actualized through individuals' participation in tasks and practices of value to themselves and to a community of practice. The co-evolutionary model for supporting the emergence of authenticity described in this study provides a means of overcoming some of the challenges associated with simulation and participation models for establishing authentic learning experiences. 相似文献
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Gabrielle Rappolt-Schlichtmann Harriet R. Tenenbaum Margy F. Koepke Kurt W. Fischer 《Mind, Brain, and Education》2007,1(2):98-108
ABSTRACT— Contextual support for performance and understanding plays an important role in learning and teaching. This study investigated the temporal course of the effects of support—how it affects complexity and correctness of judgments about density in kindergarten ( n = 35) and second-grade ( n = 29) children. In the experimental group, a teacher provided support through modeling more complex reasoning about why objects sink or float. Children's complexity judgments increased sharply with support compared to no support, although their predictions about whether objects would sink or float were mostly correct from the start. Following the support event, children showed a sudden jump in complexity of explanations, which was transient for most children, who showed either rapid decrease or some oscillation and then decrease. A few sustained the high-level explanation after the jump, showing robust knowledge. That is, patterns of performance across trials were primarily nonlinear, following mostly cubic or quadratic change. In addition, second-graders had a more complex understanding of density than did kindergarteners. Findings indicate that children's concepts are dynamic rather than static, as evidenced by the strong but transient effects of support for most students. To move from transient to robust knowledge requires the building of knowledge and skill over time. 相似文献
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During their socialisation process, many girls gifted in physics acquire a reality construction inconsistent with their objectively measurable competencies. In comparison to boys they rate their action and problem solving competencies unrealistically low, which results, for example, in extremely low participation rates in scientific and technical studies and professions. For this reason differences in motivation and self‐related cognitions become the focus of interest in explaining achievement differences. The present study was carried out prior to initial physics instruction. Students in the 7th grade of the German Gymnasium (243 girls and 282 boys) were divided according to their KFT 4‐13+ results into “average”, “gifted” or “highly gifted groups”. Prior to commencement of physics instruction, boys in general, as well as gifted male and female students, already possessed more knowledge of physics and more favourable motivation for the subject than girls or male and female students of average ability. In addition, domain specific measures and self‐related cognitions were evaluated in accordance with Dweck's model of achievement motivation. 相似文献
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