25 research outputs found
Anomalous Breaking of Anisotropic Scaling Symmetry in the Quantum Lifshitz Model
In this note we investigate the anomalous breaking of anisotropic scaling
symmetry in a non-relativistic field theory with dynamical exponent z=2. On
general grounds, one can show that there exist two possible "central charges"
which characterize the breaking of scale invariance. Using heat kernel methods,
we compute these two central charges in the quantum Lifshitz model, a free
field theory which is second order in time and fourth order in spatial
derivatives. We find that one of the two central charges vanishes.
Interestingly, this is also true for strongly coupled non-relativistic field
theories with a geometric dual described by a metric and a massive vector
field.Comment: 26 pages; major revision (results were unaffected), published versio
Perfil de limiares ventilatórios durante o exercÃcio e o consumo de oxigênio de pico verificado em jogadoras de futebol
Social representations of health surveillance among workers Representaciones sociales de trabajadores acerca de la vigilancia sanitaria Representações sociais sobre vigilância sanitária entre trabalhadores
This is a qualitative, exploratory-interpretative study, with the purpose of investigating the social representations of health surveillance among members of the National Health Surveillance Agency - ANVISA, in Rio Grande do Sul State. It was found that health surveillance is represented by subjects as a process that, despite the contradictions, is being constructed and lived in the job routine with signs of renovation of existing representations. Thus, health protection acquires a new understanding, deviating from the prevention limits that traditionally focus on disease in order to return to promotion itself. Also, the image of health police is displaced from punishment to health education, establishing links between normative and educative performance. Moreover, professionalism is based on responsibility and knowledge, and professional devaluation is anchored in the idea of exclusion. The results allow for an analysis of the elements that can be causing permanencies and influencing the movements of daily practice, being able to revert into a benefit for the construction of a professional profile.<br>Estudio cualitativo, exploratorio-interpretativo con el objetivo de conocer las representaciones sociales de trabajadores acerca de la vigilancia sanitaria en la Agencia Nacional de Vigilancia Sanitaria - ANVISA, RS. Vigilancia sanitaria fue representada por los sujetos como un proceso, el cual, a pesar de las contradicciones viene siendo construido y vivenciado en el cotidiano profesional con signos de renovación frente a las ya existentes. Asà la protección de la salud adquiere una nueva comprensión, que se aleja de los lÃmites de prevención, los que tradicionalmente enfocan a la enfermedad, para dirigirla en base a la noción de promoción. De la misma forma, la imagen de policÃa sanitaria, pasa de punición para educación sanitaria, estableciendo los ejes entre el hacer normativo y educativo. Por otro lado, el profesionalismo se fundamenta en la responsabilidad y conocimiento y en la falta de valor profesional basado en la exclusión. Los resultados favorecen un análisis de los elementos que pueden estar ocasionando su permanencia e influyendo en la práctica cotidiana, para posiblemente volverse en un beneficio para la construcción del perfil profesional.<br>Estudo qualitativo, exploratório-interpretativo, com o objetivo de conhecer as representações sociais sobre vigilância sanitária entre trabalhadores da Agência Nacional de Vigilância Sanitária - ANVISA, no Rio Grande do Sul. Verificou-se que vigilância sanitária é representada pelos sujeitos como um processo que, apesar das contradições, vem sendo construÃdo e vivenciado no cotidiano da profissão, com sinais de renovação das representações existentes. Assim, proteção à saúde adquire novo entendimento, distanciando-se dos limites da prevenção que tradicionalmente focaliza a doença, para voltar-se à noção de promoção. Também, a imagem de polÃcia sanitária desloca-se da punição para a educação sanitária, estabelecendo os elos entre os fazeres normativo e educativo. Além disso, o profissionalismo assenta-se em responsabilidade e conhecimento, e a desvalorização profissional ancora-se na idéia de exclusão. Os resultados propiciam análise dos elementos que podem estar causando permanências e influenciando os movimentos da prática cotidiana, podendo reverter em benefÃcio da construção de um perfil profissional
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Advances in the graphitization protocol at the Radiocarbon Laboratory of the Universidade Federal Fluminense (LAC-UFF) in Brazil
© 2015 Elsevier B.V. In this paper, we summarize the sample preparation methods currently used at the Radiocarbon Laboratory of the Universidade Federal Fluminense (LAC-UFF) in Brazil. We also report on a series of results with regards to the graphitization protocol. Tests with different temperatures and baking times were performed, and carbon stable isotope ratios of graphite were measured by an EA-IRMS (elemental analyzer coupled with an isotopic ratio mass spectrometer) to infer the completeness of the graphitization reaction. We monitored the muffle furnace temperature using an independent thermocouple and found a -60°C offset, which may have caused the lower graphitization yields (detected from the large isotopic fractionation on several reference materials targets). At a temperature of 520°C, the isotopic fractionation in the graphitization reaction was systematically lower (-5‰ in average) and the overall scattering was reduced. As long as isotopic fractionation corrections are made using the online stable isotopes ratios provided by the AMS system, the accuracy of the 14C results should be maintained