139 research outputs found

    On electromagnetic contributions in WIMP quests

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    The effect pointed out by A. B. Migdal in the 40's (hereafter named Migdal effect) has so far been usually neglected in the direct searches for WIMP Dark Matter candidates. This effect consists in the ionization and the excitation of bound atomic electrons induced by the recoiling atomic nucleus. In the present paper the related theoretical arguments are developed and some consequences of the proper accounting for this effect are discussed by some examples of practical interest.Comment: 14 pages, 6 figures, 2 tables, Int. J. Mod. Phys. A (in publication

    Quasi-normal frequencies: Key analytic results

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    The study of exact quasi-normal modes [QNMs], and their associated quasi-normal frequencies [QNFs], has had a long and convoluted history - replete with many rediscoveries of previously known results. In this article we shall collect and survey a number of known analytic results, and develop several new analytic results - specifically we shall provide several new QNF results and estimates, in a form amenable for comparison with the extant literature. Apart from their intrinsic interest, these exact and approximate results serve as a backdrop and a consistency check on ongoing efforts to find general model-independent estimates for QNFs, and general model-independent bounds on transmission probabilities. Our calculations also provide yet another physics application of the Lambert W function. These ideas have relevance to fields as diverse as black hole physics, (where they are related to the damped oscillations of astrophysical black holes, to greybody factors for the Hawking radiation, and to more speculative state-counting models for the Bekenstein entropy), to quantum field theory (where they are related to Casimir energies in unbounded systems), through to condensed matter physics, (where one may literally be interested in an electron tunelling through a physical barrier).Comment: V1: 29 pages; V2: Reformatted, 31 pages. Title changed to reflect major additions and revisions. Now describes exact QNFs for the double-delta potential in terms of the Lambert W function. V3: Minor edits for clarity. Four references added. No physics changes. Still 31 page

    Co-producing across organizational boundaries: promoting asylum seeker integration in Scotland

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    This paper questions whether asylum seeker integration is promoted through inter-organisational relationships between non-profit and voluntary organisations (NPVOs) and government agencies. It focuses particularly on the role of NPVOs in service delivery (co-management) and in the delivery and planning of public services (co-governance). It presents a research study on the public services provided to asylum seekers in Glasgow and asks the following questions: What role do NPVOs play in the planning and delivery of public services? When planning and delivering public services, to what extent do NPVOs work across organisational boundaries and what kind of relationships exist? And in practice, what makes inter-organisational relationships work? This paper offers new empirical evidence and also contributes to the theoretical debate around the integration of asylum seekers

    Risking innovation:Understanding risk and public service innovation - evidence from a four nation study

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    This paper presents new evidence about the governance of risk in public service innovation. It finds that risk is currently poorly understood with public service organizations. Either it is presented as a professional issue or it is dealt with purely as an actuarial or health and safety issue. There is little understanding of risk as a core component of innovation. In response, this paper argues for a more nuanced risk governance approach that calls for transparent decision-making on risk in public service innovation in relation to its intended outcomes. Politicians and public service managers need to understand that risk is an inherent element of innovation, because it engages with uncertain outcomes. A framework needs to be evolved to balance these risks against potential benefits and which can drive forward transparent risk governance involving politicians, public service mangers, citizens and local communities and other key stakeholders. This approach also needs to accept that failure can often by an outcome of innovation. The key here is not to maintain the blame culture that has dominate the debate to date but rather to embrace failure as an opportunity to learn and to improve public services and their outcomes

    Pemphigus autoimmunity: Hypotheses and realities

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    The goal of contemporary research in pemphigus vulgaris and pemphigus foliaceus is to achieve and maintain clinical remission without corticosteroids. Recent advances of knowledge on pemphigus autoimmunity scrutinize old dogmas, resolve controversies, and open novel perspectives for treatment. Elucidation of intimate mechanisms of keratinocyte detachment and death in pemphigus has challenged the monopathogenic explanation of disease immunopathology. Over 50 organ-specific and non-organ-specific antigens can be targeted by pemphigus autoimmunity, including desmosomal cadherins and other adhesion molecules, PERP cholinergic and other cell membrane (CM) receptors, and mitochondrial proteins. The initial insult is sustained by the autoantibodies to the cell membrane receptor antigens triggering the intracellular signaling by Src, epidermal growth factor receptor kinase, protein kinases A and C, phospholipase C, mTOR, p38 MAPK, JNK, other tyrosine kinases, and calmodulin that cause basal cell shrinkage and ripping desmosomes off the CM. Autoantibodies synergize with effectors of apoptotic and oncotic pathways, serine proteases, and inflammatory cytokines to overcome the natural resistance and activate the cell death program in keratinocytes. The process of keratinocyte shrinkage/detachment and death via apoptosis/oncosis has been termed apoptolysis to emphasize that it is triggered by the same signal effectors and mediated by the same cell death enzymes. The natural course of pemphigus has improved due to a substantial progress in developing of the steroid-sparing therapies combining the immunosuppressive and direct anti-acantholytic effects. Further elucidation of the molecular mechanisms mediating immune dysregulation and apoptolysis in pemphigus should improve our understanding of disease pathogenesis and facilitate development of steroid-free treatment of patients

    Co-creating, co-producing and connecting: Museum practice today.

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    This is the peer reviewed version of the following article: Barnes, P., & McPherson, G. (2019). Co‐Creating, Co‐producing and Connecting: Museum Practice Today. Curator: The Museum Journal, 62(2), 257-267., which has been published in final form at https://doi.org/10.1111/cura.12309. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-ArchivingWe argue in this paper that museums have become hybrid spaces, where consumers look and challenge what they see; they form part of what they see; with some aspects of exhibitions now co‐created and co‐produced by the consumer (Kershaw et al. 2018; Solis 2012). This paper draws on an example from a group that we worked with using performance as a tool to engage a ‘hard to reach’ or ‘socially excluded’ groups. We conclude that by allowing audiences to co‐create and co‐produce exhibitions and performance; this can turn the museum rhetoric of community engagement into practice and create a space that is truly inclusive for the communities it serves. We demonstrate how the possibility of seeing museums as hybrid spaces, which can adapt, can be used for education and entertainment, and how that has in turn led to the transformation of people's lives in a previously socially excluded community
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