Spin-orbit mode transfer via a classical analog of quantum teleportation

We translate the quantum teleportation protocol into a sequence of coherent operations involving three degrees of freedom of a classical laser beam. The protocol, which we demonstrate experimentally, transfers the polarisation state of the input beam to the transverse mode of the output beam. The role of quantum entanglement is played by a non-separable mode describing the path and transverse degrees of freedom. Our protocol illustrates the possibility of new optical applications based on this intriguing classical analogue of quantum entanglement.Comment: 5 pages, 7 figure

Tripartite entanglement and quantum relative entropy

We establish relations between tripartite pure state entanglement and additivity properties of the bipartite relative entropy of entanglement. Our results pertain to the asymptotic limit of local manipulations on a large number of copies of the state. We show that additivity of the relative entropy would imply that there are at least two inequivalent types of asymptotic tripartite entanglement. The methods used include the application of some useful lemmas that enable us to analytically calculate the relative entropy for some classes of bipartite states.Comment: 7 pages, revtex, no figures. v2: discussion about recent results, 2 refs. added. Published versio

Podolsky Electromagnetism at Finite Temperature: Implications on Stefan-Boltzmann Law

In this work we study Podolsky electromagnetism in thermodynamic equilibrium. We show that a Podolsky mass-dependent modification to the Stefan-Boltzmann law is induced and we use experimental data to limit the possible values for this free parameter.Comment: 13 pages, submitted to Physical Review

Graduação em informática em saúde: aspectos a serem considerados na proposição de novos cursos

Por meio de revisão de literatura foi possível observar que várias são as iniciativas internacionais voltadas para processos educacionais em informática em saúde. Destas, privilegiou-se a discussão do ensino de graduação e os aspectos que devem ser considerados durante a criação de novos cursos nesse campo.Metodologicamente, adotouse como referência o pragmatismo, que enfatiza os problemas postos pela realidade e o conhecimento disponível para solucioná-los. Conclui-se que a proposição de um curso de graduação em informática em saúde apresenta dificuldades que impactam na constituição de corpos docentes e discentes, pois o campo ainda se encontra em processo de consolidação científica.Through literature review it was observed that there are several international initiatives focused on educational processes in health informatics. Of these, we focused on the discussion of undergraduate and aspects that should be considered during the creation of new courses in this field.Methodologically, pragmatism was adopted as a reference, since it emphasizes the problems posed by reality and knowledge available to solve them. It is concluded that the proposal of an undergraduate degree in health informatics presents difficulties that impact the formation of faculty and students, because the field is still in the process of scientific consolidation.Sociedad Argentina de Informática e Investigación Operativ

Caracterização biométrica e físico-química dos frutos de acessos de manga 'Ubá'.

Este trabalho teve como objetivo avaliar a dissimilaridade genética de acessos de manga ?Ubá? na região leste de Minas Gerais, por meio da caracterização biométrica e físico-química dos frutos, visando a identificar materiais de interesse industrial para futuros trabalhos de melhoramento. Frutos de 67 acessos de mangueira Ubá provenientes do leste de Minas Gerais foram caracterizados, avaliando-se: massa da fruta, massa do endocarpo, relação polpa/endocarpo, diâmetro longitudinal, diâmetro transversal, sólidos solúveis totais, acidez total titulável, relação sólidos solúveis total/acidez total titulável e pH. Os resultados foram avaliados por estatística descritiva, utilizando-se de medida de tendência central (média) e de variabilidade de dados (desvio-padrão). Foram realizadas análises estatísticas, utilizando-se das técnicas de agrupamento e medidas de dissimilaridade. Os frutos que apresentaram melhores características para o processamento foram os provenientes dos acessos 10; 22; 23; 24; 35; 38; 40; 42; 52; 55 e 63. A análise de agrupamento mostrou a formação de dois grupos de acessos com base nas características biométricas e físico-químicas dos frutos, o que demonstra variabilidade genética em mangueiras Ubá, no leste de Minas Gerais

Graduação em informática em saúde: aspectos a serem considerados na proposição de novos cursos

Por meio de revisão de literatura foi possível observar que várias são as iniciativas internacionais voltadas para processos educacionais em informática em saúde. Destas, privilegiou-se a discussão do ensino de graduação e os aspectos que devem ser considerados durante a criação de novos cursos nesse campo.Metodologicamente, adotouse como referência o pragmatismo, que enfatiza os problemas postos pela realidade e o conhecimento disponível para solucioná-los. Conclui-se que a proposição de um curso de graduação em informática em saúde apresenta dificuldades que impactam na constituição de corpos docentes e discentes, pois o campo ainda se encontra em processo de consolidação científica.Through literature review it was observed that there are several international initiatives focused on educational processes in health informatics. Of these, we focused on the discussion of undergraduate and aspects that should be considered during the creation of new courses in this field.Methodologically, pragmatism was adopted as a reference, since it emphasizes the problems posed by reality and knowledge available to solve them. It is concluded that the proposal of an undergraduate degree in health informatics presents difficulties that impact the formation of faculty and students, because the field is still in the process of scientific consolidation.Sociedad Argentina de Informática e Investigación Operativ

Graduação em informática em saúde: aspectos a serem considerados na proposição de novos cursos

Por meio de revisão de literatura foi possível observar que várias são as iniciativas internacionais voltadas para processos educacionais em informática em saúde. Destas, privilegiou-se a discussão do ensino de graduação e os aspectos que devem ser considerados durante a criação de novos cursos nesse campo.Metodologicamente, adotouse como referência o pragmatismo, que enfatiza os problemas postos pela realidade e o conhecimento disponível para solucioná-los. Conclui-se que a proposição de um curso de graduação em informática em saúde apresenta dificuldades que impactam na constituição de corpos docentes e discentes, pois o campo ainda se encontra em processo de consolidação científica.Through literature review it was observed that there are several international initiatives focused on educational processes in health informatics. Of these, we focused on the discussion of undergraduate and aspects that should be considered during the creation of new courses in this field.Methodologically, pragmatism was adopted as a reference, since it emphasizes the problems posed by reality and knowledge available to solve them. It is concluded that the proposal of an undergraduate degree in health informatics presents difficulties that impact the formation of faculty and students, because the field is still in the process of scientific consolidation.Sociedad Argentina de Informática e Investigación Operativ

Electric field inversion asymmetry: Rashba and Stark effects for holes in resonant tunneling devices

We report experimental evidence of excitonic spin-splitting, in addition to the conventional Zeeman effect, produced by a combination of the Rashba spin-orbit interaction, Stark shift and charge screening. The electric-field-induced modulation of the spin-splitting are studied during the charging and discharging processes of p-type GaAs/AlAs double barrier resonant tunneling diodes (RTD) under applied bias and magnetic field. The abrupt changes in the photoluminescence, with the applied bias, provide information of the charge accumulation effects on the device.Comment: 4 pages, 2 figure

Effect of oxygen reducing atmospheres on the quality and safety of stored shelled Brazil nut packs

High moisture content, relative humidity, temperature and environment rich in oxygen (O2) are the main factors for tree nuts to get infected by fungi and so aflatoxins (AFLs) contaminated. During storage and commercialization dry Brazil nuts packs need to maintain their safety and quality. Modified atmospheres in storage (macro-environment) and packaging (micro-environment) have been used to prolong food shelf life by reducing O2 concentration with inhibitory gases or, more recently, by adding O2 absorber pads. This work reports the application of O2 atmosphere reducing methods on stored shelled Brazil nut packs aiming fungi and AFL degradation as well as hygienic conditions improvements. The methods applied were: (a) ozone - O3, (b) carbon dioxide - CO2 and (c) O2 absorber pads with and without vacuum. Nuts were submitted to microbiological tests (fungi, aflatoxigenic strains, yeast and bacteria), moisture content and AFLs analysis. From all O2 reducing atmosphere evaluated, the best performance was obtained with O3. A reduction on fungi growth (1.8 x 104 cfu.g-1 to 2.6 x 10 cfu.g-1) and yeast destruction after the first month of storage were registered. Also O3 was the only nut treatment that was able to degrade AFLs. None of the spiked (AFLs: 15 ppb) nut samples O3 treated had AFLs detected up to the LOQ of the method (0.36 μg.kg-1 for AFB1+AFB2+AFG1+AFG2) i.e., much lower than the allowed by the European Union regulation (MRL: 4 and 2 ppb for total and AFB1, respectively), thus producing safer nuts. All other treatments stabilized and/or inhibited microorganisms growth. Add CO2 and O2 pads played an important role on nut quality. Further study will be carried out in order to adjust O3 concentration and application conditions for longer period of storage