Symmetry Nonrestoration in a Resummed Renormalized Theory at High Temperature

We reinvestigate the interesting phenomenon of symmetry nonrestoration at high temperature in the multifield O(N_1) X O(N_2) model. We apply modified self-consistent resummation (MSCR) in order to obtain the scalar dressed masses and find in what circumstances a resummed multifield theory which has symmetry (non)restoration can be renormalized. It is shown that, aside from the consistency of the MSCR method, the basic ingredient that guarantees the renormalization of a multifield model within a resummation approach is the T^2 mass behavior of field theory at high temperature.Comment: 14 pages, 1 ps figure, revtex, Phys. Rev. D versio

Nonequilibrium pion dynamics near the critical point in a constituent quark model

We study static and dynamical critical phenomena of chiral symmetry breaking in a two-flavor Nambu--Jona-Lasinio constituent quark model. We obtain the low-energy effective action for scalar and pseudoscalar degrees of freedom to lowest order in quark loops and to quadratic order in the meson fluctuations around the mean field. The \emph{static} limit of critical phenomena is shown to be described by a Ginzburg-Landau effective action including \emph{spatial} gradients. Hence \emph{static} critical phenomena is described by the universality class of the O(4) Heisenberg ferromagnet. \emph{Dynamical} critical phenomena is studied by obtaining the equations of motion for pion fluctuations. We find that for $T<T_c$ the are stable long-wavelength pion excitations with dispersion relation $\omega_{\pi}(k)=k$ described by isolated pion poles. The residue of the pion pole vanishes near $T_c$ as $Z \propto 1/|\ln(1-T/T_c)|$ and long-wavelength fluctuations are damped out by Landau damping on a time scale $t_\mathrm{rel}(k)\propto 1/k$, reflecting \emph{critical slowing down} of pion fluctuations near the critical point. At the critical point, the pion propagator features mass shell logarithmic divergences which we conjecture to be the harbinger of a (large) dynamical anomalous dimension. We find that while the \emph{classical spinodal} line coincides with that of the Ginzburg-Landau theory, the growth rate of long-wavelength spinodal fluctuations has a richer wavelength dependence as a consequence of Landau damping. We argue that Landau damping prevents a \emph{local} low energy effective action in terms of a derivative expansion in real time.Comment: 22 pages 5 figures. to appear in Nucl. Phys.

O papel da gamificação no desenvolvimento das habilidades cognitivas e na aprendizagem de estudantes autistas: revisão sistemática da literatura

Os desafios no processo de aprendizagem de crianças e jovens autistas têm incentivado a busca por práticas educacionais gamificadas para esses indivíduos. Assim, o objetivo dessa Revisão Sistemática da Literatura foi investigar o papel da gamificação na aprendizagem e no estímulo da capacidade cognitiva de estudantes com Transtorno do Espectro Autista (TEA). Para isso, analisamos diversas abordagens na literatura acerca de práticas de jogos no contexto educacional com foco no autismo. Vários estudos relatam o uso da gamificação em favor da aprendizagem de estudantes com TEA

Survival and prognostic factors in patients with oral squamous cell carcinoma

This study aimed to evaluate sociodemographic and clinical factors influencing overall survival (OS) in patients with oral squamous cell carcinoma (OSCC). Medical charts of 547 patients with OSCC from a public hospital in northeastern Brazil seen between 1999 and 2013 were evaluated. Survival analysis was performed using the Kaplan-Meier method. The influence of age, sex, ethnicity, clinical stage, anatomical location, type of treatment, and comorbidities on the patients? prognosis was evaluated. Cox proportional hazards regression model was used to identify independent prognostic factors. The 5-year OS was 39%. Multivariate analysis showed that age < 40 years (HR = 2.20; 95%CI: 1.02-4.72) and a single treatment modality (HR = 1.91; 95%CI: 1.37-2.67) were associated with a poor prognosis, while early clinical stage resulted in better outcomes (HR = 0.38; 95%CI: 0.25-0.58). OSCC patients in advanced clinical stages, diagnosed at a younger age, and submitted to a single therapeutic modality have a poorer prognosis

Prevalência do consumo de drogas lícitas e ilícitas no complexo presidiário de Recife- PE / Prevalence of licit and illicit drug use in the Recife-PE prison complex

A organização do Estado com o sistema carcerário é notícia constante nos meios de comunicação. O consumo de drogas entre os detentos e a violência existente no âmbito prisional estão entre os principais desafios encontrados. Esta pesquisa teve como objetivo mapear o consumo de drogas no maior Complexo Prisional em população do Brasil, situado em Recife- PE. Foi realizado estudo analítico transversal, com uma amostra calculada de 756 pessoas privadas de liberdade, previamente aprovado pelo Comitê de Ética em Pesquisa através do Parecer nº 2.159.052. Um questionário sobre dados sociodemográficos e consumo de drogas foi aplicado por um anotador previamente treinado. Na análise estatística foram realizados testes específicos para comparação de proporção nos níveis de fatores qualitativos. Observou-se que 49,1% da amostra consumia drogas ilícitas com predominância do uso da maconha, sendo verificados valores significativos da prevalência desse consumo entre os mais jovens, casados e que fazem uso concomitante de tabaco e bebida alcóolica. Os achados obtidos evidenciaram a necessidade de implementar programas de atenção como forma de erradicar o consumo de drogas entre os detentos. Programas de segurança para bloquear o tráfico de drogas dentro das prisões poderão trazer uma modificação na conduta da população carcerária

Erratum to: 36th International Symposium on Intensive Care and Emergency Medicine

[This corrects the article DOI: 10.1186/s13054-016-1208-6.]