112,084 research outputs found

    Riding the Third Wave of SoTL

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    Taking stock of an enterprise can be a stimulating exercise. It is also an essential one that allows for assessment of what one has while facilitating the planning of what one wants. In this piece, we take stock of the scholarship of teaching and learning (SoTL), mapping out what we see as the first two waves of the movement, and then identifying a ‘third wave.’ We believe it is time to think bigger. Specifically, those practicing SoTL need to: infiltrate the mainstream, run interference and catalyze the use of SoTL, and work towards a grand picture of learning

    Global Trends in Mediation: Riding the Third Wave

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    The chapter introduces the proceeding chapters

    Wave-riding and wave-passing by ducklings in formation swimming

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    It has been commonly observed on open waters that ducklings/goslings follow their mothers in a highly organized formation. The questions arise: (1) why are they swimming in formation? (2) what is the best swimming formation? (3) how much energy can be preserved by each individual in formation swimming? To address these questions, we established a simplified mathematical and numerical model and calculated the wave drag on a group of waterfowl in a swimming formation. We observed two new and interesting findings: wave-riding and wave-passing. By riding the waves generated by a mother duck, a trailing duckling can obtain a significant wave-drag reduction. When a duckling swims at the ‘sweet point’ behind its mother, a destructive wave interference phenomenon occurs and the wave drag of the duckling turns positive, pushing the duckling forward. More interestingly, this wave-riding benefit could be sustained by the rest of the ducklings in a single-file line formation. Starting from the third one in a queue, the wave drag of individuals gradually tended towards zero, and a delicate dynamic equilibrium was achieved. Each individual under that equilibrium acted as a wave passer, passing the waves’ energy to its trailing one without any energy losses. Wave-riding and wave-passing are probably the principal reasons for the evolution of swimming formation by waterfowl. This study is the first to reveal the reasons why the formation movement of waterfowl can preserve individuals’ energy expenditure. Our calculations provide new insights into the mechanisms of formation swimming

    Wound-up phase turbulence in the Complex Ginzburg-Landau equation

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    We consider phase turbulent regimes with nonzero winding number in the one-dimensional Complex Ginzburg-Landau equation. We find that phase turbulent states with winding number larger than a critical one are only transients and decay to states within a range of allowed winding numbers. The analogy with the Eckhaus instability for non-turbulent waves is stressed. The transition from phase to defect turbulence is interpreted as an ergodicity breaking transition which occurs when the range of allowed winding numbers vanishes. We explain the states reached at long times in terms of three basic states, namely quasiperiodic states, frozen turbulence states, and riding turbulence states. Justification and some insight into them is obtained from an analysis of a phase equation for nonzero winding number: rigidly moving solutions of this equation, which correspond to quasiperiodic and frozen turbulence states, are understood in terms of periodic and chaotic solutions of an associated system of ordinary differential equations. A short report of some of our results has been published in [Montagne et al., Phys. Rev. Lett. 77, 267 (1996)].Comment: 22 pages, 15 figures included. Uses subfigure.sty (included) and epsf.tex (not included). Related research in http://www.imedea.uib.es/Nonlinea

    Setting the agenda or responding to voters? Political parties, voters and issue attention

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    Why do political parties prioritise some policy issues over others? While the issue ownership theory suggests that parties emphasise policy issues on which they have an advantage in order to increase the salience of these issues among voters, the riding the wave theory argues instead that parties respond to voters by highlighting policy issues that are salient in the minds of citizens. This study sheds new light on the selective issue emphasis of political parties by analysing issue attention throughout the entire electoral cycle. On the basis of a quantitative text analysis of more than 40,000 press releases published by German parties from 2000 until 2010, this article provides empirical support for the riding the wave theory. It shows that political parties take their cues from voters by responding to the issue priorities of their electorate. The results have important implications for political representation and the role that parties play in democracies
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