Genuine Multipartite Entanglement in Quantum Phase Transitions

We demonstrate that the Global Entanglement (GE) measure defined by Meyer and Wallach, J. Math. Phys. 43, 4273 (2002), is maximal at the critical point for the Ising chain in a transverse magnetic field. Our analysis is based on the equivalence of GE to the averaged linear entropy, allowing the understanding of multipartite entanglement (ME) features through a generalization of GE for bipartite blocks of qubits. Moreover, in contrast to GE, the proposed ME measure can distinguish three paradigmatic entangled states: $GHZ_{N}$, $W_{N}$, and $EPR^{\otimes N/2}$. As such the generalized measure can detect genuine ME and is maximal at the critical point.Comment: 4 pages, 3 figures. Replaced with final published versio

Nematic liquid crystal dynamics under applied electric fields

In this paper we investigate the dynamics of liquid crystal textures in a two-dimensional nematic under applied electric fields, using numerical simulations performed using a publicly available LIquid CRystal Algorithm (LICRA) developed by the authors. We consider both positive and negative dielectric anisotropies and two different possibilities for the orientation of the electric field (parallel and perpendicular to the two-dimensional lattice). We determine the effect of an applied electric field pulse on the evolution of the characteristic length scale and other properties of the liquid crystal texture network. In particular, we show that different types of defects are produced after the electric field is switched on, depending on the orientation of the electric field and the sign of the dielectric anisotropy.Comment: 7 pages, 12 figure

On X-ray-singularities in the f-electron spectral function of the Falicov-Kimball model

The f-electron spectral function of the Falicov-Kimball model is calculated within the dynamical mean-field theory using the numerical renormalization group method as the impurity solver. Both the Bethe lattice and the hypercubic lattice are considered at half filling. For small U we obtain a single-peaked f-electron spectral function, which --for zero temperature-- exhibits an algebraic (X-ray) singularity ($|\omega|^{-\alpha}$) for $\omega \to 0$. The characteristic exponent $\alpha$ depends on the Coulomb (Hubbard) correlation U. This X-ray singularity cannot be observed when using alternative (Keldysh-based) many-body approaches. With increasing U, $\alpha$ decreases and vanishes for sufficiently large U when the f-electron spectral function develops a gap and a two-peak structure (metal-insulator transition).Comment: 8 pages, 8 figures, revte

Banco de Dados de Genótipos e Fenótipos (BDGF) para suporte a estudos de associação genômica ampla e seleção genômica em programas de melhoramento animal.

Este documento complementa os trabalhos previamente desenvolvidos, apresentando um modelo de dados para armazenamento de dados de genótipos, fenótipos e pedigree de animais de interesse agropecuário para suporte tanto a experimentos de GWAS quanto a programas de melhoramento genético animal, Banco de Dados de Genótipos e Fenótipos(BDGF).bitstream/item/138127/1/Doc133.pd

Diffusion Enhancement in Core-softened fluid confined in nanotubes

We study the effect of confinement in the dynamical behavior of a core-softened fluid. The fluid is modeled as a two length scales potential. This potential in the bulk reproduces the anomalous behavior observed in the density and in the diffusion of liquid water. A series of $NpT$ Molecular Dynamics simulations for this two length scales fluid confined in a nanotube were performed. We obtain that the diffusion coefficient increases with the increase of the nanotube radius for wide channels as expected for normal fluids. However, for narrow channels, the confinement shows an enhancement in the diffusion coefficient when the nanotube radius decreases. This behavior, observed for water, is explained in the framework of the two length scales potential.Comment: 17 pages, 8 figures, accept for publication at J. Chem. Phy

Transition Matrix Monte Carlo Reweighting and Dynamics

We study an induced dynamics in the space of energy of single-spin-flip Monte Carlo algorithm. The method gives an efficient reweighting technique. This dynamics is shown to have relaxation times proportional to the specific heat. Thus, it is plausible for a logarithmic factor in the correlation time of the standard 2D Ising local dynamics.Comment: RevTeX, 5 pages, 3 figure

Características físico-químicas de sucos de uvas Isabel Precoce e BRS Violeta elaborados no Nordeste do Brasil.

A avaliação da adaptação de variedades de uva destinadas à elaboração de sucos a determinadas condições de clima e solo requer estudos específicos, contando com uma avaliação analítica do produto elaborado. O objetivo do presente trabalho foi comparar os sucos obtidos a partir de duas variedades de uvas labruscas produzidas no Vale do São Francisco. Os sucos foram elaborados em triplicata pelo método artesanal, a partir de uvas das variedades BRS Violeta e Isabel Precoce. As variáveis analisadas foram pH, sólidos solúveis totais, acidez total e volátil, dióxido de enxofre livre e total, teor alcoólico, índice de cor, antocianinas totais e índice de polifenóis totais (I-280). As médias foram comparadas pelo teste de Tukey a 5% de probabilidade. Apenas para o pH não houve diferença significativa, sendo as demais variáveis significativamente diferentes entre as variedades, nos sucos analisados. A variedade BRS Violeta apresentou excelente potencial para a elaboração comercial de sucos na região

Chaotic Interaction of Langmuir Solitons and Long Wavelength Radiation

In this work we analyze the interaction of isolated solitary structures and ion-acoustic radiation. If the radiation amplitude is small solitary structures persists, but when the amplitude grows energy transfer towards small spatial scales occurs. We show that transfer is particularly fast when a fixed point of a low dimensional model is destroyed.Comment: LaTex + 4 eps file

Características físico-químicas de sucos de uvas Isabel Precoce e BRS Violeta elaborados no Nordeste do Brasil.

A avaliação da adaptação de variedades de uva destinadas à elaboração de sucos a determinadas condições de clima e solo requer estudos específicos, contando com uma avaliação analítica do produto elaborado. O objetivo do presente trabalho foi comparar os sucos obtidos a partir de duas variedades de uvas labruscas produzidas no Vale do São Francisco. Os sucos foram elaborados em triplicata pelo método artesanal, a partir de uvas das variedades BRS Violeta e Isabel Precoce. As variáveis analisadas foram pH, sólidos solúveis totais, acidez total e volátil, dióxido de enxofre livre e total, teor alcoólico, índice de cor, antocianinas totais e índice de polifenóis totais (I-280). As médias foram comparadas pelo teste de Tukey a 5% de probabilidade. Apenas para o pH não houve diferença significativa, sendo as demais variáveis significativamente diferentes entre as variedades, nos sucos analisados. A variedade BRS Violeta apresentou excelente potencial para a elaboração comercial de sucos na região