Some properties of two Nambu--Jona-Lasinio -type models with inputs from lattice QCD

We investigate the phase diagram of the so-called Polyakov--Nambu--Jona-Lasinio (PNJL) model at finite temperature and nonzero chemical potential. The calculations are performed in the light and strange quark sectors ($u$, $d$, $s$), which includes the 't Hooft instanton induced interaction term that breaks the axial symmetry, and the quarks are coupled to the (spatially constant) temporal background gauge field. On one hand, a special attention is payed to the critical end point (CEP). The strength of the flavor-mixing interaction alters the CEP location, since when it becomes weaker the CEP moves to low temperatures and can even disappear. On the other hand, we also explore the connection between QCD, a nonlocal Nambu--Jona-Lasinio type model and the Landau gauge gluon propagator. Possible links between the quenched gluon propagator and low energy hadronic phenomenology are investigated.Comment: Contribution to the International Meeting "Excited QCD", Peniche, Portugal, 06 - 12 May 201

Interplay between chiral and axial symmetries in a SU(2) Nambu--Jona-Lasinio Model with the Polyakov loop

We consider a two flavor Polyakov--Nambu--Jona-Lasinio (PNJL) model where the Lagrangian includes an interaction term that explicitly breaks the U$_A(1)$ anomaly. At finite temperature, the restoration of chiral and axial symmetries, signaled by the behavior of several observables, is investigated. We compare the effects of two regularizations at finite temperature, one of them, that allows high momentum quarks states, leading to the full recovery of chiral symmetry. From the analysis of the behavior of the topological susceptibility and of the mesonic masses of the axial partners, it is found in the SU(2) model that, unlike the SU(3) results, the recovery of the axial symmetry is not a consequence of the full recovery of the chiral symmetry. Thus, one needs to use an additional idea, by means of a temperature dependence of the anomaly coefficient, that simulates instanton suppression effects.Comment: 21 pages, 5 figures; PRD versio

Modelo de edificação para a produção de leitões em cama sobreposta.

bitstream/item/58282/1/CUsersPiazzonDocuments299.pd

Prevalence of Salmonella on tomatoes from organic and conventional production in Rio de Janeiro (Brazil).

Outbreaks of salmonellosis associated with tomatoes have been related over the past fifteen years. Tomatoes may become surface contaminated with Salmonella spp. from production of consumption. Purpose: The purpose of this study was to evaluate the prevalence of Salmonella spp. on tomatoes surface from organic and conventional production. Samples were collected in the street cendors and supermarkets, and analzed by two methods; the mini-VIDAS SLM assay a specific enzyme-linked fluorescent immonoassay (ELFA) rapid method and the conventional FDA-BAM. Methods: A total of 263 tomatoes were collected during a two-year (2010-2012) survey. A hundred twenty-seven were from organic production, 61 from supermarkets and 66 from street vendors. From conventional production 136 samples were collected, being 84 from supermarkets and 52 from street vendors. All samples were simultaneously surface analyzed by mini-VIDAS SLM and FDA BAM. Results: Salmonella spp. was not detected by the conventional method and two false positives were found by mini-VIDAS SLM. Significance: Surface tomatoes from organic and conventional production analyzed in the city of Rio de Janeiro showed no potential Salmonella risk to their consumption

Universal relaxation function in nonextensive systems

We have derived the dipolar relaxation function for a cluster model whose volume distribution was obtained from the generalized maximum Tsallis nonextensive entropy principle. The power law exponents of the relaxation function are simply related to a global fractal parameter $\alpha$ and for large time to the entropy nonextensivity parameter $q$. For intermediate times the relaxation follows a stretched exponential behavior. The asymptotic power law behaviors both in the time and the frequency domains coincide with those of the Weron generalized dielectric function derived from an extension of the Levy central limit theorem. They are in full agreement with the Jonscher universality principle. Moreover our model gives a physical interpretation of the mathematical parameters of the Weron stochastic theory and opens new paths to understand the ubiquity of self-similarity and power laws in the relaxation of large classes of materials in terms of their fractal and nonextensive properties.Comment: Two figures. Submitted for publicatio

Unidade desenvolve tecnologia para manejo e bem-estar animal.

Projeto:11.11.11.111

Incidência de lesões em suínos abatidos em frigoríficos da região sul do Brasil.

Projeto/Plano de Ação: 03.08.60800-01

Comportamento dos suínos nas baias de espera em frigoríficos brasileiros.

bitstream/item/50860/1/publicacao-488.pdfProjeto: 02.09.07.007