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While bookstores play the vital role in book distribution, little attention has been paid to concentration and conglomerate ownership in the retail book trade. In 1958, one-store book firms accounted for nearly 80 percent of book sales; by 1982 that figure had fallen to 26 percent even though single-store retailers continue to account for a majority of all bookstore outlets. Today the chains control at least 54 percent of bookstore sales. Buoyed by discriminatory discounts and publisher-subsidized advertising campaigns, the chains’ dramatic growth seems likely to continue despite the fact that they are less profitable than independent booksellers. The chains’ marketing orientation fits well with changes in the broader publishing industry, as publishers seek to rationalize operations in order to improve the bottom line. As books become just another commodity, sold through increasingly centralized and monopolized channels, access for alternative and minority voices is being for-closed.  相似文献   
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Research in Science Education - This study investigated the relationships of teacher-directed approaches with science achievement in Australian schools. The data for this study were drawn from the...  相似文献   
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Prior research on pretrial publicity has produced mixed results and a roughly equal number of studies show an effect, show no effect, or show mixed results. We explored the effects of (a) homogenous vs. heterogeneous exposure (whether deliberating jurors were all exposed to the same publicity or not) and (b) pre-deliberation queries as potential contributors to mixed results. We found an effect for positive but not negative publicity on conviction rates but not evidence ratings. Exposure heterogeneity appears to explain these differences and pre-deliberation queries did appear to play some role in the obtained outcomes. Overall these findings do not replicate a robust publicity effect and future research should consider how homogeneous exposure and pre-deliberation opinion queries influence results.  相似文献   
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The purpose of this study was to analyse the effect of bike type – the 26-inch-wheel bike (26“ bike) and the 29-inch-wheel bike (29“ bike) – on performance in elite mountain bikers. Ten Swiss National Team athletes (seven males, three females) completed six trials with individual start on a simulated cross-country course with 35 min of active recovery between trials (three trials on a 26“ bike and three trials on a 29“ bike, alternate order, randomised start-bike). The course consisted of two separate sections expected to favour either the 29“ bike (section A) or the 26“ bike (section B). For each trial performance, power output, cadence and heart rate were recorded and athletes’ experiences were documented. Mean overall performance (time: 304 ± 27 s vs. 311 ± 29 s; P < 0.01) and performance in sections A (P < 0.001) and B (P < 0.05) were better when using the 29“ bike. No significant differences were observed for power output, cadence or heart rate. Athletes rated the 29“ bike as better for performance in general, passing obstacles and traction. The 29“ bike supports superior performance for elite mountain bikers, even on sections supposed to favour the 26“ bike.  相似文献   
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Abstract

Few can deny the significance of sport in today’s South Africa. The sporting structures upon which this is based were first introduced to the country by the British in the late nineteenth century. In line with policies of cultural imperialism, sports such as cricket were promoted at this time as part of a wider political agenda that encouraged the adoption of an ‘English’ way of life in the region. Sports tours, most notably cricket, were a fundamental part of this cultural transfer between the ‘Mother Country’ and her colonies in Southern Africa. To underpin the study of transnational linkages and transfer in African sports, this paper will offer an historical overview of how ‘British-styled’ sport arrived in South Africa and how the early cricket tours between England and South Africa were constructed to promote distinct political and cultural connections. This paper will explore the early development of cricket in South Africa and investigate its symbiotic link to British imperialism and colonialism via the first tours and sporting exchanges that took place. The origins of the game in South Africa will be examined as well as its development up to 1910 (the date of Union in South Africa) as the site of a constructed transnational 'brotherhood' between Britain and its most coveted African colonies.  相似文献   
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Physical education (PE) lessons involve complex and dynamic interactive sequences between students, equipment and teacher. The potential for unexpected and/or unintended events is relatively large, a point reflected in an increasing amount of scholarship dealing with classroom management (CM). This scholarship further suggests that unexpected and disruptive events negatively impact on learning and can have deleterious effects on teacher health. Despite considerable potential for these kinds of events, many PE lessons occur in structured, organized ways. The broad purpose of this paper is to consider how classroom action becomes ordered in PE contexts. To this end, an interactional approach is put forward including the specific analytic concepts of directives, epistemic authority and deontic authority. To exemplify the approach, the micro-dynamics of a situation in which a group of students are building a human pyramid is examined. The examination draws attention to: how the teacher engages in a series of interactions with the students to move the sequence forward; how the students themselves achieve order through their interactions with one another; and how the characteristics of the activity help to organize the students' behaviors and limit possibilities for action. The discussion is located against a backdrop of current CM scholarship. Reference is also made to two aspects of social context: the increasing prominence of managerial discourse in educational arenas and the significance of student-centeredness in pedagogical theory. Both aspects appear to influence how order can be achieved in PE today. The analysis raises issues related to pedagogy, management and authority which are addressed in the final two sections of the paper.  相似文献   
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