13,295 research outputs found

    Second Generation of 'Miranda Procedure' for CP Violation in Dalitz Studies of B (\& D \& \tau) Decays

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    The `Miranda Procedure' proposed for analyzing Dalitz plots for CP asymmetries in charged B and D decays in a model-independent manner is extended and refined. The complexity of CKM CP phenomenology through order λ6\lambda^6 is needed in searches for New Dynamics (ND). Detailed analyses of three-body final states other great advantages: (i) They give us more powerful tools for deciding whether an observed CP asymmetry rep- resents the manifestation of ND and its features. (ii) Many advantages can already be obtained by the `Miranda Procedure' without construction of a detailed Dalitz plot de- scription. (iii) One studies CP asymmetries independent of production asymmetries. We illustrate the power of a second generation Miranda Procedure with examples with time integrated rates for Bd/BˉdB_d/\bar B_d decays to final states KSπ+π−K_S\pi+\pi- as trial runs with comments on B±→K±π+π−/K±K+K−B^{\pm} \to K^{\pm}\pi^+\pi^-/K^{\pm}K^+K^-.Comment: 29 pages, 7 figure

    Research in hospitality management and accounting: a research synthesis and analysis of current literature and future challenges

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    This study characterizes the results of social-scientific, behavioral science, and managerial/accounting research on current management and accounting matters in the hotel industry published in the most prestigious scientific hospitality journals and identifies avenues for future research. Based on an analysis of a set of 55 articles published in the journals that make up the SCImago Journal and Coutry Rank, published between 2005 and 2015, it is concluded that there is a lack of research in the financial accounting group; additional research is required for the small hotel category, and it is the important to use comparative studies that are better able to capture the characteristics of the hospitality industry. Additionally, most of the empirical studies analyzed come from European countries and statistical methods are extensively used in all topic areas. Finally, some gaps are identified in the literature and indicated future research priorities.info:eu-repo/semantics/publishedVersio

    Flow Diverters Devices for Treatment of Intra-Cranial Aneurysms - Six Months Follow-Up Results

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    A reconstrução endoluminal com sistemas de derivação de fluxo (flow diverter devices) constitui uma técnica inovadora no tratamento de aneurismas intra-cranianos. Estes novos stents, auto-expansíveis e de reduzida porosidade, são libertados através de microcateterização da artéria portadora do aneurisma, reconstruindo assim a sua parede e excluindo a formação aneurismática da circulação arterial. Neste trabalho mostramos os resultados preliminares obtidos no tratamento de 10 doentes no Hospital de São José, Lisboa. Estes doentes, com aneurismas de colo largo (> 4mm) ou ratio saco/colo não favorável (< 1,5), foram tratados com o sistema PIPELINE®, e estudos angiográficos de controlo foram efectuados aos três e seis meses. Novo controlo será feito aos 12 meses. A idade media dos doentes envolvidos é de 54,3 anos, oito doentes são do sexo feminino e dois doentes do sexo masculino. Os aneurismas foram incidentalmente descobertos em dois doentes e os restantes foram diagnosticados no contexto de investigação imagiológica por cefaleias (n = 3), defeito de campo visual (n = 1), vertigens (n = 1) e parésia de pelo menos um par craniano (n = 2). Em apenas dois doentes foi observada hemorragia subaracnoideia e outros dois doentes foram submetidos a terapêutica endovascular prévia, com espiras metálicas. As localizações dos aneurismas tratados são o segmento M1/M2 da artéria cerebral média (n = 1) e os segmentos da artéria carótida interna para-oftálmico (n = 6), oftálmico (n = 2) e cavernoso (n = 4). Treze aneurismas intra-cranianos foram tratados uma vez que três doentes apresentavam múltiplos aneurismas. Os estudos de controlo efectuados demonstram um grau de oclusão médio aos três meses de 74% e aos seis meses de 86%. Não se observou qualquer redução das dimensões do saco de um dos aneurismas para-oftálmico. A experiência deste serviço é muito favorável a utilização de sistemas de derivação de fluxo no tratamento de aneurismas seleccionados, tendo obtido taxas de oclusão elevadas dados os desafios existentes na terapêutica deste tipo de aneurismas

    Syndemic contexts: findings from a review of research on non-communicable diseases and interviews with experts

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    Background Syndemics are characterized by the clustering of two or more health conditions, their adverse interaction, and contextual factors that create the conditions for clustering and/or interaction that worsens health outcomes. Studying syndemics entails drawing on diverse disciplines, including epidemiology and anthropology. This often means collaboration between researchers with different scholarly backgrounds, who share and – ideally – integrate their findings. Objective This article examines how context within syndemics has been defined and studied. Methods A literature review of empirical studies focusing on syndemics involving non-communicable diseases (NCDs) and mental health conditions was conducted and the full text of 13 articles was analyzed. The review was followed-up with semi-structured interviews with 11 expert researchers working in the field. Results The review and interviews highlighted a relatively consistent definition of syndemics. The reviewed studies of NCD-related syndemics tended to focus on micro-level context, suggesting a need to analyze further underlying structural factors. In their syndemics research, respondents described working with other disciplines and, although there were some challenges, welcomed greater disciplinary diversity. Methodological gaps, including a lack of mixed methods and longitudinal studies, were identified, for which further interdisciplinary collaborations would be beneficial. Conclusions NCD-related syndemics research would benefit from further analysis of structural factors and the interconnections between syndemic components across multiple levels, together with more ambitious research designs integrating quantitative and qualitative methods. Research on the COVID-19 pandemic can benefit from a syndemics approach, particularly to understand vulnerability and the unequal impacts of this public health crisis
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