10 research outputs found

    Quasiparticle band structure of lithium hydride

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    We consider the energy bands of quasielectrons and quasiholes in lithium hydride within the Coulomb-hole\u2013plus\u2013screened-exchange formalism. The crystal density matrix is expressed by means of localized Gaussian functions and off-diagonal terms are preserved and rigorously accounted for. Using a basis set of plane waves orthogonalized to the cation core wave function, we express the matrix elements of the nonlocal self-energy operator in analytic form, thus achieving high numerical accuracy with moderate computational labor. Our theoretical results for the quasiparticle band structure, the valence bandwidth, the energy gap, and exciton resonances are in good agreement with the available optical and photoemission data. Ab initio inclusion of the many-body effects is found to be a key point for a theoretical interpretation of experimental electron properties and transitions in LiH

    Flow control of weakly non-parallel flows: Application to trailing vortices

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    A general formulation is proposed to control the integral amplification factor of harmonic disturbances in weakly non-parallel amplifier flows. The sensitivity of the local spatial stability spectrum to a base-flow modification is first determined, generalizing the results of Bottaro et al. (J. Fluid Mech., vol. 476, 2003, pp. 293-302). This result is then used to evaluate the sensitivity of the overall spatial growth to a modification of the inlet flow condition. This formalism is applied to a non-parallel Batchelor vortex, which is a well-known model for trailing vortices generated by a lifting wing. The resulting sensitivity map indicates the optimal modification of the inlet flow condition enabling the stabilization of the helical modes. It is shown that the control, formulated using a single linearization of the flow dynamics carried out on the uncontrolled configuration, successfully reduces the total spatial amplification of all convectively unstable disturbances

    Belle epoque Cairo museums itineraries: مسارات متاحف الزمن الجميل

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    The project of “Belle Époque ” Cairo Museums Itinerary (BECAMI) is part of the research program Preserving Egypt’s Cultural Heritage, launched in 2016 by the Arts and Humanities Research Council (AHRC) in the UK, and the Science and Technology Development Fund (STDF) in Egypt. It is a partnership between four Departments of Architecture. The UK team is formed by Cardiff University (previously by the University of Sheffield) and Queen’s University (Belfast), and the Egypt team of the French University and the Fine Arts of Helwan University. The project is led by two principal investigators: Dr Magda Sibley (previously Senior Lecturer at Sheffield University, currently Reader in History and Theory of Architecture at the Welsh School of Architecture and School Director for International Relations), and Professor Galila Elkadi (previously Head of the department of Architecture at the French University in Egypt, currently Emeritus Professor of Urban Planning at the French University in Egypt)

    Pure epidermoid cyst of ovary

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    Indicators of guideline-concordant care in lung cancer defined with a modified Delphi method and piloted in a cohort of over 5,800 cases

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    Background: To identify indicators of guideline-concordant care in lung cancer, to implement such indicators with cancer registry data linked to health databases, and to pilot them in a cohort of patients from the cancer registry of the Milan Province. Methods: Thirty-four indicators were selected by revision of main guidelines by cancer epidemiologists, and then evaluated by a multidisciplinary panel of clinicians involved in lung cancer care and working on the pathway of lung cancer diagnosis and treatment in the Lombardy region, Italy. With a modified Delphi method, they assessed for each indicator the content validity as a quality measure of the care pathway, the degree of modifiability from the health professional, and the relevance to the health professional. Feasibility was assessed using the cancer registry and the routine health records of the Lombardy region. Feasible indicators were then calculated in the cohort of lung cancer patients diagnosed in 2007–2012 derived from the cancer registry of the Milan Province. Criterion validity was assessed reviewing clinical records of a random sample of 114 patients (threshold for acceptable discordance ≤20%). Finally, reliability was evaluated at the provider level. Results: Initially, 34 indicators were proposed for evaluation in the first Delphi round. Of the finally 22 selected indicators, 3 were not feasible because the required information was actually not available. The remaining 19 were calculated on the pilot cohort. After assessment of criterion validity (3 eliminated), 16 indicators were retained in the final set and evaluated for reliability. Conclusion: The developed and piloted set of indicators is now available to implement and monitor, over time, quality initiatives for lung cancer care in the studied health system
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