1,764 research outputs found

    The impact of long-term ICT projects on student attitudes and capabilities

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    This study draws on pre- and post-surveys of 574 upper primary students who engaged in intensive work over two school terms to produce a multimodal narrative using desktop animation software. It was thought that factors such as general ability with computers, interest in composing stories and persistence with long-term projects might be influences of successful completion or higher quality products. Over the course of the project, there is evidence of student growth in the ICT-related skills as well as enjoyment and capacity with story composition. However, concerns remain over the pedagogy of extended project work and the impact of this on student learning in the affective domain. The impact of these findings for classroom teaching and the planning of long-term ICT projects are discussed

    The stochastic dynamics of nanoscale mechanical oscillators immersed in a viscous fluid

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    The stochastic response of nanoscale oscillators of arbitrary geometry immersed in a viscous fluid is studied. Using the fluctuation-dissipation theorem it is shown that deterministic calculations of the governing fluid and solid equations can be used in a straightforward manner to directly calculate the stochastic response that would be measured in experiment. We use this approach to investigate the fluid coupled motion of single and multiple cantilevers with experimentally motivated geometries.Comment: 5 pages, 5 figure

    Responses of Holstein calves to dietary calcium, phosphorus, and vitamin D3 using response surface techniques

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    The metabolism of calcium, phosphorus, and vitamin D has been a classical topic of nutrition studies through the past fifty years. Many experiments have been conducted to determine the relationship of calcium, phosphorus, and vitamin D in the animal body. All results have led to the conclusion that vitamin D will affect the absorption and/or retention of calcium and phosphorus, and the amount of calcium will affect calcium and phosphorus metabolism. However, the effect of the dietary level of phosphorus has been questioned (1, 56, 65, 69). The chemistry and site of the majority of these actions is still to a great extent unknown. The usual procedure for studying a problem of this type is to hold two of the factors constant and vary the third. Information obtained from studies of this type is limited in that it relates to only one set of conditions. A mathematical description of responses as related to any dietary combination within limits of calcium, phosphorus, and vitamin D would be desirable. The primary objective of this study was to quantitatively relate calcium, phosphorus, and vitamin D over a comparatively wide range of each and to determine the dietary combinations for maximum absorption, retention, and growth in the dairy calf. A secondary objective was to check the validity of mathematical techniques in describing biological systems

    Water exchange at a hydrated platinum electrode is rare and collective

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    We use molecular dynamics simulations to study the exchange kinetics of water molecules at a model metal electrode surface -- exchange between water molecules in the bulk liquid and water molecules bound to the metal. This process is a rare event, with a mean residence time of a bound water of about 40 ns for the model we consider. With analysis borrowed from the techniques of rare-event sampling, we show how this exchange or desorption is controlled by (1) reorganization of the hydrogen bond network within the adlayer of bound water molecules, and by (2) interfacial density fluctuations of the bulk liquid adjacent to the adlayer. We define collective coordinates that describe the desorption mechanism. Spatial and temporal correlations associated with a single event extend over nanometers and tens of picoseconds.Comment: 10 pages, 9 figure

    Contemporary cognitive load theory research: The good, the bad and the ugly

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    Kirschner, P. A., Ayres, P., & Chandler, P. (2011). Contemporary cognitive load theory research: The good, the bad and the ugly. Computers in Human Behavior, 27(1), 99-105. doi:10.1016/j.chb.2010.06.025This paper reviews the 16 contributions of the special issue entitled Current Research in Cognitive Load Theory. Each paper is briefly summarized and some critical comments made. The overall collection is then discussed in terms of the positive contributions they make to the field of learning and instruction, and cognitive load theory in particular (the good), as well as problematical issues such as unresolved explanations and conflicting results (the bad) and the special case of measuring cognitive load (the ugly)

    Characterizing heterogeneous dynamics at hydrated electrode surfaces

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    In models of Pt 111 and Pt 100 surfaces in water, motions of molecules in the first hydration layer are spatially and temporally correlated. To interpret these collective motions, we apply quantitative measures of dynamic heterogeneity that are standard tools for considering glassy systems. Specifically, we carry out an analysis in terms of mobility fields and distributions of persistence times and exchange times. In so doing, we show that dynamics in these systems is facilitated by transient disorder in frustrated two-dimensional hydrogen bonding networks. The frustration is the result of unfavorable geometry imposed by strong metal-water bonding. The geometry depends upon the structure of the underlying metal surface. Dynamic heterogeneity of water on the Pt 111 surface is therefore qualitatively different than that for water on the Pt 100 surface. In both cases, statistics of this adlayer dynamic heterogeneity responds asymmetrically to applied voltage.Comment: 6 page, 4 figure

    Responsive Regulation in Child Welfare: Systemic Challenges to Mainstreaming the Family Group Conference

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    The purpose of this article is to examine the challenges inherent in trans- forming child welfare services. We apply Braithwaite\u27s model of responsive regulation to the restorative practice of family group conferencing in child welfare. Shifting the role of the state away from controller of families in the child protective services system to one of regulatory partner with them is extraordinarily difficult. The paper looks at the complexities of reorienting child welfare services through the use of family group conferences on a large scale

    Opening Our Eyes : How film contributes to the culture of the UK

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    Opening our eyes looks at how films are consumed and the factors which affect people’s viewing choices. It also covers the relationships audiences report between film and other activities. It goes on to explore the sorts of effects which film has upon people, their sense of identity and relationship with the world. Finally it looks at the various effects which individual films have had on those surveyed and reaches a number of conclusions.Final Published versio
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