Deformations of Quantum Field Theories on Curved Spacetimes

The construction and analysis of deformations of quantum field theories by warped convolutions is extended to a class of globally hyperbolic spacetimes. First, we show that any four-dimensional spacetime which admits two commuting and spacelike Killing vector fields carries a family of wedge regions with causal properties analogous to the Minkowski space wedges. Deformations of quantum field theories on these spacetimes are carried out within the operator-algebraic framework - the emerging models share many structural properties with deformations of field theories on flat spacetime. In particular, deformed quantum fields are localized in the wedges of the considered spacetime. As a concrete example, the deformation of the free Dirac field is studied. Second, quantum field theories on de Sitter spacetime with global U(1) gauge symmetry are deformed using the joint action of the internal symmetry group and a one-parameter group of boosts. The resulting theories turn out to be wedge-local and non-isomorphic to the initial one for a class of theories, including the free charged Dirac field. The properties of deformed models coming from inclusions of CAR-algebras are studied in detail. Third, the deformation of the scalar free field in the Araki-Wood representation on Minkowski spacetime is discussed as a motivating example.Comment: PhD thesis, University of Vienna, 2012 (advisors: J. Yngvason and G. Lechner) 107 pages, 3 figure

Deformations of quantum field theories on de Sitter spacetime

Quantum field theories on de Sitter spacetime with global U(1) gauge symmetry are deformed using the joint action of the internal symmetry group and a one-parameter group of boosts. The resulting theory turns out to be wedge-local and non-isomorphic to the initial one for a class of theories, including the free charged Dirac field. The properties of deformed models coming from inclusions of CAR-algebras are studied in detail.Comment: 26 pages, no figure

The segments method

Se reporta el uso de segmentos como dominio de integración para los métodos libres de mallas de tipo Petrov-Galerkin Local (MLPG). El procedimiento acarrea ventajas en el tratamiento de dominios con forma geométrica irregular, circunda el problema de la precisión numérica en la cuadratura y permite de forma simple traspasar un número arbitrario de derivadas de la función de forma a la función de ponderación. Este trabajo describe el procedimiento algebraico necesario. Además hace referencia al estudio experimental de errores que se hizo para el presente método en casos de prueba bidimensionales; con el objetivo de constatar la estabilidad y precisión del mismo.Peer Reviewe

Melhoria da Atenção ao Pré-Natal e Puerpério na UBS Postosus Centro, Encantado/RS

MORFA, LazaraYudet Vinent.Melhoria da Atenção ao Pré-natal e Puerpério na UBS Posto SUS Centro, Encantado /RS.2015. 111. Trabalho de Conclusão de Curso (Curso de Especialização em Saúde da Família) - Departamento de Medicina Social, Faculdade de Medicina, Universidade Federal de Pelotas, Pelotas, 2015. A atenção pré-natal e puerperal é fundamental para a saúde materna e neonatal e deve incluir ações de prevenção e promoção da saúde, além de diagnóstico e tratamento adequado dos problemas que ocorrem neste período. O presente trabalho teve como objetivo melhorar a atenção ao pré-natal e puerpério. Foi realizado na UBS Posto SUS Centro no município Encantado/RS, desde o dia 30 de Janeiro até 4 de Junho do ano 2015, teve duração de 12 semanas. Antes do início do projeto de intervenção tínhamos uma cobertura pré-natal apenas de 18% (37 gestantes) e 77% (130 puérperas) de cobertura ao puerpério pela estimativa do caderno de ação programática. Para melhorar a atenção ao pré-natal e puerpério foram desenvolvidas ações de capacitação da equipe de saúde, ações de promoção de saúde, palestras nas comunidades, atendimento clinico qualificado das gestantes e puérperas e monitoramento e avaliação das planilhas de acompanhamento/espelhos das gestantes e puérperas. Ao longo dos três meses de intervenção foi possível aumentar a cobertura de atendimento ao pré-natal e puerpério, alcançando no final do projeto de intervenção uma cobertura pré-natal de 56,4% (79 gestantes) e 100% de cobertura ao puerpério (185 puérperas), atingindo assim as metas propostas. Em relação a garantir a 100% das gestantes o ingresso no Programa de Pré-Natal no primeiro trimestre de gestação não foi possível atingir a meta proposta, alcançamos apenas 72,4%(57 gestantes), devido a que grande parte destas faziam acompanhamentos em outros serviços, ou vieram provenientes de outros municípios, em que não houve captação precoce. Conseguimos oferecer a todas as gestantes e puérperas exame clinico apropriado, solicitação de todos os exames laboratoriais, prescrição de sulfato ferroso e ácido fólico, vacinação em dia, avaliação da necessidade de atendimento odontológico e primeira consulta programática odontológica, registros adequados, avaliação de risco gestacional, orientações nutricionais, sobre aleitamento materno, cuidados com o recém-nascido, anticoncepção após o parto, riscos do tabagismo, uso de álcool e drogas na gestação e higiene bucal.Com a intervenção foi possível sensibilizar ainda mais os profissionais de saúde, quanto à importância do atendimento ao pré-natal e puerpério com qualidade seguindo os protocolos preconizados pelo Ministério de Saúde, promovendo ações de educação em saúde. A continuidade das ações é fundamental para que maior parte da população se beneficie das ações e que resultados a longo prazo sejam observados. Palavras-chave: Saúde da Família; Atenção Primária à Saúde; Saúde da Mulher; Pré-natal; Puerpério

Discrete Element Modelling of Rock Cutting Processes Interaction with Evaluation of Tool Wear

The document presents a numerical model of rocks and soils using spherical Discrete Elements, also called Distinct Elements. The motion of spherical elements is described by means of equations of rigid body dynamics. Explicit integration in time yields high computational efficiency. Spherical elements interact among one another with contact forces, both in normal and tangential directions. Efficient contact search scheme based on the octree structures has been implemented. Special constitutive model of contact interface taking into account cohesion forces allows us to model fracture and decohesion of materials. Numerical simulation predicts wear of rock cutting tools. The developed numerical algorithm of wear evaluation allows us us to predict evolution of the shape of the tool caused by wear. Results of numerical simulation are validated by comparison with experimental data

Transparent metal electrodes from ordered nanosphere arrays

We show that perforated metal electrode arrays, fabricated using nanosphere lithography, provide a viable alternative to conductive metal oxides as transparent electrode materials. The inter-aperture spacing is tuned by varying etching times in an oxygen plasma, and the effect of inter-aperture “wire” thickness on the optical and electronic properties of perforated silver films is shown. Optical transmission is limited by reflection and surface plasmons, and for these results do not exceed 73%. Electrical sheet resistance is shown to be as low as 3 Ω ◻−1 for thermally evaporated silver films. The performance of organic photovoltaic devices comprised of a P3HT:PCBM bulk heterojunction deposited onto perforated metal arrays is shown to be limited by optical transmission, and a simple model is presented to overcome these limitations

Numerical modelling with experimental validation applied to the study of stud connectors behaviour in concrete and steel composite structures

In this work, the behaviour of stud shear connectors in composite structures is studied, starting from the via numeric simulation of the push out test in a steel beam – with solid concrete slab concrete section is studied. The study considers material non-linearity material of concrete and steel, adopting firstly a bilinear model for both (steel and concrete), and in the second case, to the difference ofdiffering from other authors, the concrete damage plasticity of the concrete. ABAQUS is used to model the push out test. The basis and methodology of the modelmodelling process push out test are explained. The numerical results obtained are in accordance with the experimental results, which . This aspect shows the efficacythat of the finite element method is efficient for the in studying the behaviour of stud shear connector’s behavior. Finally, the capacities of shear connections obtained from the finite element analysis were are compared with to the connection strengths calculated using the American Specification (AISC-LRFD (2005)), European Code (Eurocode 4 (2004)) and Cuban Code (NR-080-2004). It this was is observed that, these specifications over estimate this value (capacities of shear connections) in many cases.Postprint (published version

a perspective on materials, synthesis methods and applications

The oxides of copper (CuxO) are fascinating materials due to their remarkable optical, electrical, thermal and magnetic properties. Nanostructuring of CuxO can further enhance the performance of this important functional material and provide it with unique properties that do not exist in its bulk form. Three distinctly different phases of CuxO, mainly CuO, Cu2O and Cu4O3, can be prepared by numerous synthesis techniques including, vapour deposition and liquid phase chemical methods. In this article, we present a review of nanostructured CuxO focusing on their material properties, methods of synthesis and an overview of various applications that have been associated with nanostructured CuxO

INFOBASIC: multimedia interactiva para el aprendizaje de elementos básicos de la computación/INFOBASIC: interactive multimedia for learning Computer Science basic elements

La asignatura Computación para el primer año de la carrera de Agronomía (educación a distancia), aporta los conocimientos esenciales para el trabajo con computadoras y su aplicación en el transcurso de la carrera. El artículo tiene como objetivo proponer el software educativo Infobasic como herramienta para el aprendizaje de los elementos básicos de la informática en el primer año de la carrera de Agronomía (educación a distancia). El software, resultante del trabajo científico metodológico, constituye un mediador didáctico para el desarrollo del proceso de enseñanza-aprendizaje de la asignatura; en su elaboración se emplearon métodos los teóricos, así como la observación y el análisis de documentos