Spin canting induced large nonreciprocal Goos-Hänchen shifts

Recent studies on surface reflection illustrate how light beams can be laterally shifted from the position predicted by geometrical optics, the so called Goos-Hänchen effect. In antiferromagnets this shifts can be controlled with an external magnetic field. We show that a configuration in which spins cant in response to applied magnetic fields enhance possibilities of field controlled shifts. Moreover, we show that nonreciprocal displacements are possible, for both oblique and normal incidence, due to inherent nonreciprocity of the polariton phase with respect to the propagation direction. In the absence of an external field, reciprocal displacements occur

Microscopic origin of level attraction for a coupled magnon-photon system in a microwave cavity

We discuss various microscopic mechanisms for level attraction in a hybridized magnon-photon system of a ferromagnet in a microwave cavity. The discussion is based upon the electromagnetic theory of continuous media where the effects of the internal magnetization dynamics of the ferromagnet are described using dynamical response functions. This approach is in agreement with quantized multi-oscillator models of coupled photon-magnon dynamics. We demonstrate that to provide the attractive interaction between the modes, the effective response functions should be diamagnetic. Magneto-optical coupling is found to be one mechanism for the effective diamagnetic response, which is proportional to photon number. A dual mechanism based on the Aharonov-Casher effect is also highlighted, which is instead dependent on magnon number.Comment: New Journal of Physics, Focus on Cavity Optomagnonics Issu

A Seleção de Eduardo Galeano

IX Congresso Brasileiro de Hispanistas realizado nos dias 22 a 25 agosto 2016Propomos com este texto, uma reflexão crítica acerca do fenômeno da modernização uruguaia através da observação dos fenômenos históricos e políticos que tornaram do futebol uma ferramenta do modelo administrativo do Uruguai durante a Era Batllista e como este se aliou às políticas de intervenção do Estado, do rádio e da prática esportiva para lograr seus êxitos. Na literatura, contemporâneo aos fatos supracitados, o autor Mario Benedetti se encarrega de lançar um olhar sobre a massa. O escritor uruguaio é um dos que integra a coletânea organizada pelo seu conterrâneo Eduardo Galeano, a pedido da editorial Arca. Su majestade el fútbol (1968) aponta para uma nova modalidade, a coletânea de textos cujo tema central era o futebol. O título de sua obra faz alusão ao primeiro texto do livro Lo que debo al fútbol, do escritor argelino Albert Camus, escrito originalmente para a France Footbal em 1957. Galeano, em seu livro, congrega diversos escritores em torno de um tema comum. Sua seleção conta com escritores uruguaios intelectuais e jornalistas, inclusive, alguns com participação no periódico Marcha, como Mario Benedetti e Carlos Maggi, por exemplo. Para tanto lançarseá mão da leitura de DA MATTA (1982), FRANCO JÚNIOR (2007) e ROCCA (1991) para dar conta do fenômeno do futebol, bem como DELEUZE (1987) a fim de levantar os signos que perpassam o ato de rememorar. Ao perceber a peculiaridade e a distinção de como a modernidade se apresenta na periferia do capitalismo, laçouse mão da leitura de investigadores como ARTEAGA (2008), BAUMAN (2001), BETTHEL (2002) e BERMAN (2007).UNILA­-UNIOEST

Heartbeat Anomaly Detection using Adversarial Oversampling

Cardiovascular diseases are one of the most common causes of death in the world. Prevention, knowledge of previous cases in the family, and early detection is the best strategy to reduce this fact. Different machine learning approaches to automatic diagnostic are being proposed to this task. As in most health problems, the imbalance between examples and classes is predominant in this problem and affects the performance of the automated solution. In this paper, we address the classification of heartbeats images in different cardiovascular diseases. We propose a two-dimensional Convolutional Neural Network for classification after using a InfoGAN architecture for generating synthetic images to unbalanced classes. We call this proposal Adversarial Oversampling and compare it with the classical oversampling methods as SMOTE, ADASYN, and RandomOversampling. The results show that the proposed approach improves the classifier performance for the minority classes without harming the performance in the balanced classes

A maximum entropy approach to H-theory: Statistical mechanics of hierarchical systems

A novel formalism, called H-theory, is applied to the problem of statistical equilibrium of a hierarchical complex system with multiple time and length scales. In this approach, the system is formally treated as being composed of a small subsystem---representing the region where the measurements are made---in contact with a set of `nested heat reservoirs' corresponding to the hierarchical structure of the system. The probability distribution function (pdf) of the fluctuating temperatures at each reservoir, conditioned on the temperature of the reservoir above it, is determined from a maximum entropy principle subject to appropriate constraints that describe the thermal equilibrium properties of the system. The marginal temperature distribution of the innermost reservoir is obtained by integrating over the conditional distributions of all larger scales, and the resulting pdf is written in analytical form in terms of certain special transcendental functions, known as the Fox $H$-functions. The distribution of states of the small subsystem is then computed by averaging the quasi-equilibrium Boltzmann distribution over the temperature of the innermost reservoir. This distribution can also be written in terms of $H$-functions. The general family of distributions reported here recovers, as particular cases, the stationary distributions recently obtained by Mac\^edo {\it et al.} [Phys.~Rev.~E {\bf 95}, 032315 (2017)] from a stochastic dynamical approach to the problem.Comment: 20 pages, 2 figure

Tunable focusing in natural hyperbolic magnetic media

While optical effects such as negative refraction and imaging obtained from slab lenses with plane parallel sides are widely studied using metamaterials, it is less well known that these effects can occur naturally in certain materials. We discuss a class of natural hyperbolic materials that not only display similar effects but also allow one to modify the focal length of a slab lens with an externally applied magnetic field. This is possible because antiferromagnets are gyrotropic and support magnetic polaritons whose frequencies are sensitive to magnetic fields. In addition, a rich caustic structure emerges at low temperatures, when damping should be small. These materials also produce slab focusing at higher temperatures, although the caustic structure disappears

Comentários à jurisprudência de natureza processual coletiva, oriunda do E. TJMG.

Comenta acórdão do TJMG indeferiu liminar sobre cobrança de tarifa de esgoto na cidade de Araxá-MG

Avaliação na estratégia saúde da família

Esta cartilha faz parte dos materiais didáticos dos cursos de especialização para trabalhadores vinculados à Atenção Básica ofertados pela UFPE. Espera-se, com esse material, que os estudantes percebam a importância da incorporação da Avaliação em Saúde à sua prática como instrumento permanente para tomadas de decisão e, por consequência, ampliação da sua capacidade de monitorar as ações, responder às necessidades locais em saúde; além de identificar e corrigir problemas de forma integral