45,630 research outputs found

    Electron Cotunneling into a Kondo Lattice

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    Motivated by recent experimental interest in tunneling into heavy electron materials, we present a theory for electron tunneling into a Kondo lattice. The passage of an electron into the Kondo lattice is accompanied by a simultaneous spin flip of the localized moments via cotunneling mechanism. We compute the tunneling current with the large-NN mean field theory. In the absence of disorder, differential tunneling conductance exhibits two peaks separated by the hybridization gap. Disorder effects lead to the smearing of the gap resulting in a Fano lineshape.Comment: 4 pages, 2 eps figure

    Foreword Special Issue: Ethical Issues in Representing Older Clients

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    Sticking with Spanish: Reasons for Study and Motivation Maintenance in Adult Beginner Distance Language Learners

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    This paper examines the reasons for study of adult beginner distance learners of Spanish and the relationships between those reasons and motivation maintenance. A survey of 563 Open University UK students found motivational orientations distinct from those of young people in earlier studies. Adult learners who maintained their motivation also demonstrated a greater number of reasons for study. Their motivation embraced intrinsic and extrinsic, integrative and instrumental orientations, short-term and long-term ambitions, and an L2 self both ideal and realistically attainable. During their course module they focused more consistently than others on the language skills they had targeted, and expressed increased enjoyment of the learning experience. This study suggests that achieving ‘softer’ short-term goals encourages persistence towards longer-term goals which reflect the ideal L2 self

    Implications of external validity for research on polycentric and complex adaptive systems

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    Much recent research has examined the implications of policy analysis for complex adaptive social-ecological systems. System complexity comes from both the natural environment as well as complex institutional arrangements that humans use to manage and regulate such systems. Such research has systematically investigated how the interaction of a host of variables relate to some evaluation criteria. Many scholars argue that a deep understanding of the social-ecological systems, however, comes at the expense of externally valid inferences to other systems. In this paper I argue that having a nuanced understanding of the social-ecological system actually helps one to understand which types of policy domains an analysis might be generalized. --Complex Adaptive Systems,External Validity,Polycentric Systems
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