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The purpose of this article was to examine the validity of self-reported pedometer steps/day. Forty-seven participants were provided a New Lifestyles NL-2000 (NL-2000; Lees Summit, MO, USA) pedometer and a physical activity (PA) diary for 3 weeks, but not informed of the data-storing capabilities. For weeks 2 and 3, each participant was given a step goal of 3,000 steps/day above week 1 average. A 2 × 3 repeated measures analysis of variance (ANOVA) was used to examine differences between reported steps/day. Bland–Altman plots assessed the mean bias and limits of agreement between reporting methods. Mean self-reported and NL-2000 steps/day were 9,264 ± 3,555 and 8,971 ± 3,590 steps/day (n = 26, p > .05). Mean biases were 216 ± 1,753 (week 1), –506 ± 1,355 (week 2), and –590 ± 1,360 (week 3) steps/day. Negative mean bias values indicate higher self-reported steps/day. Mean steps/day were similar between recording methods, but large differences were observed among individuals, suggesting self-reported steps/day may be valid for PA research at the population level, but not the individual level.  相似文献   
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This study tracked the influence of explicit reflective instructional methods on cultural values, ethical and intellectual development, and the relationship of these with preservice teachers' views of nature of science (NOS). The researchers used the Views of Nature of Science Form B (VNOS B) to describe NOS views, the Learning Context Questionnaire (LCQ) to classify preservice teachers' ethical and intellectual positions using Perry's scheme, and the Schwartz Values Inventory (SVI) to measure preservice teachers' cultural values. The interventions took place in two concurrent courses: a science methods course, and a foundations of early childhood course. The science methods course explicitly emphasized NOS throughout the semester, and the foundations of early childhood course reinforced these ideas through cultural activities that stressed empirical evidence. Analysis of data showed relationships between preservice teachers' Perry positions and responses on the VNOS B with those at higher positions exhibiting more informed NOS views. Relationships between preservice teachers' NOS views and their cultural values were identified, such as those at the dualism position holding achievement more highly for scientists than those at other Perry positions. The values preservice teachers held personally were different from those they held as important for scientists. © 2007 Wiley Periodicals, Inc. J Res Sci Teach 45: 748–770, 2008  相似文献   
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In response to the increasing recognition of the need for sustainable food systems, research on students’ and educators’ knowledge of food systems and sustainability more broadly has grown but has generally focused on what people ‘fail’ to understand. Moving away from this deficit approach, the present study used semi-structured interviews to explore how 12 pre-service teachers (PSTs) in the US consider sustainability in terms of the trade-offs – or concurrent costs and benefits – associated with using different agricultural resources over short, medium, and long terms. Drawing upon the constructs of framing, metacognition, and complex causality, the study found that the majority of PSTs referred to indirect experiences of seeing or hearing about agricultural resources to demonstrate stable knowledge of short-term trade-offs and construct tentative knowledge about medium-term trade-offs. Few described long-term trade-offs. Most participants also acknowledged some gaps in their knowledge in discussing trade-offs across the different time scales. Findings suggest the importance of leveraging and building upon educators’ (and ultimately students’) prior experiences to build their understanding of complex trade-offs that underlie food systems. The study also illustrates the value of using the concept of trade-offs across time scales to explore people’s conceptions and understandings of sustainability.  相似文献   
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Abstract

In the introductory column by new column coeditors Amy Cooper Cary and Rosemary Pleva Flynn, the authors explain the goals and methodology for the column, and address the significance of professional networking. Authors focus on networking strategies and resources for both new and seasoned archivists.  相似文献   
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Albert C. Book and Norman D. Cary's The Television Comercial: Creativity and Craftsmanship (Decker, $6.95 paperback)

Stuart N. Hyde's Television and Radio Announcing (Houghton-Hifflin, $9.95)

William O. Johnson Jr.'s Super Spectator and Electronic Lilliputian (Little-Brown, $6.95)  相似文献   
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The girls inhabiting the deviant subject position of female juvenile offenders have no home in normalized total social institutions. This paper wonders about and wanders through various historical and contemporary studies "about" female juvenile offenders and discusses the intersections of the unhomely spaces (Bhabha, 1994) that exclude and even abandon those in this subject position. The juvenile female offender seems to be "outside" of culture, existing in an impossibly homeless space. This is vital work to interrupt and complicate the assumptions that limit the spaces of being for the girls studied. Using critical discourse analysis (Fairclough, 1995) and deviant historiography (Terry, 1991) in a hybrid methodology, the discursive spaces of im/possible being will be highlighted. A recent report from the American Bar Association and the National Bar Association highlights the gaps and failures of the system when it comes to girls. By analyzing the intersections of historical discourses constructing the female juvenile offender as deviant, this paper highlights the im/possibility of "home", that is the "unhomely spaces" of the social institutions catering to these girls and the homelessness of the deviant girl within and against the hegemonic discourses - thus troubling what it means to research the "homeless".  相似文献   
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