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We analyzed how two basic electromagnetism textooks approach the concept of electric field. We limited our study to the reasons given in these textbooks for the introduction of the field representation and to how accurate, coherent, and complete these reasons are. Because many times historical reasons are intertwined with textbooks' explanations of physical phenomena, we used the historical evolution of the field representation to guide our analysis. The analysis shows that one textbook mixes up the historical and pedagogical reasons for the introduction of the concept of field. The other one presents a sketch that might lead students to understand the field and the action-at-a-distance views as supplementing each other. 相似文献
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Gordon E Finley 《Int J Intercult Relat》1979,3(1):5-13
Although the topic of research collaboration receives infrequent comment, a well functioning collaborative process is crucial to the substantive success of intercultural research enterprises. The present report addresses this topic and focuses on two major sets of collaborative issues, the personal/ personnel and the structural/organizational. The issues are organized around the phases of the project at which they optimally should be considered and resolved. 相似文献
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On July 1, 2009, the Financial Accounting Standards Board officially adopted the Accounting Standards Codification as the sole source of generally accepted accounting principles. The codification is available online, and users may either subscribe to the free Basic View or purchase the Professional View. Although both views provide access to the same content, the Professional View contains more features than the Basic View and provides a significant increase in usability. This article compares the features within the Professional and Basic Views and discusses the implications of access for librarians, researchers, faculty, and students. 相似文献
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Science education researchers have, with few exceptions, not used the conceptual content of science as an important variable in their research. Writings of two groups-philosophers of science, “are concerned with the influence of the conceptual knowledge shared by an intellectual community on the activities of that community and the psychologists are concerned with the influence of the conceptual knowledge held by an individual on that individual's behavior”, science, are concerned with the influence of the conceptual knowledge shared by an intellectual community on the activities of that community and the psychologists are concerned with the influence of the conceptual knowledge held by an individual on that individual's behavior. Suggestions are offered as to what kinds of science education research could be done in which the conceptual content of science is important. 相似文献
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In 2008, the University of Louisville’s (UofL) Ekstrom Library printed reference collection numbered almost 30,000 volumes. Copious collecting and sparse weeding built up the collection during the era before the Internet. There had been considerable reluctance to address its more outdated sections due to competing priorities and inertia. A change of leadership as well as the recognition of changing use patterns had lessened the need for such a large collection. In 2011, three librarians began a title-by-title review process that resulted in an 86% reduction of the reference collection by 2014. This article describes that process, summarizes the results, and discusses the benefits and disadvantages of this approach. 相似文献
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Local school districts often stagger daily start times for their schools in order to reduce busing costs. This paper uses data on all middle school students in Wake County, NC from 1999 to 2006 to identify the causal effect of daily start times on academic performance. Using variation in start times within schools over time, the effect is a two percentile point gain in math test scores – roughly fourteen percent of the black–white test score gap. I find similar results for reading scores and using variation in start times across schools. The effect is stronger for students in the lower end of the distribution of test scores. I find evidence supporting increased sleep as a mechanism through which start times affect test scores. Later start times compare favorably on cost grounds to other education interventions which result in similar test score gains. 相似文献