Impacto da insulinoterapia prévia no prognóstico dos pacientes diabéticos com síndromes coronárias agudas

Impact of previous insulin therapy on the prognosis of diabetic patients with acute coronary syndrome

The anisotropic XY model on the inhomogeneous periodic chain

The static and dynamic properties of the anisotropic XY-model $(s=1/2)$ on the inhomogeneous periodic chain, composed of $N$ cells with $n$ different exchange interactions and magnetic moments, in a transverse field $h,$ are determined exactly at arbitrary temperatures. The properties are obtained by introducing the Jordan-Wigner fermionization and by reducing the problem to a diagonalization of a finite matrix of $nth$ order. The quantum transitions are determined exactly by analyzing, as a function of the field, the induced magnetization 1/n\sum_{m=1}^{n}\mu_{m}\left ($j$ denotes the cell, $m$ the site within the cell, $\mu_{m}$ the magnetic moment at site $m$ within the cell) and the spontaneous magnetization $1/n\sum_{m=1}^{n}\left< S_{j,m}^{x},\right>$ which is obtained from the correlations $\left< S_{j,m}^{x}S_{j+r,m}^{x}\right>$ for large spin separations. These results, which are obtained for infinite chains, correspond to an extension of the ones obtained by Tong and Zhong(\textit{Physica B} \textbf{304,}91 (2001)). The dynamic correlations, $\left< S_{j,m}^{z}(t)S_{j^{\prime},m^{\prime}}^{z}(0)\right>$, and the dynamic susceptibility, $\chi_{q}^{zz}(\omega),$ are also obtained at arbitrary temperatures. Explicit results are presented in the limit T=0, where the critical behaviour occurs, for the static susceptibility $\chi_{q}^{zz}(0)$ as a function of the transverse field $h$, and for the frequency dependency of dynamic susceptibility $\chi_{q}^{zz}(\omega)$.Comment: 33 pages, 13 figures, 01 table. Revised version (minor corrections) accepted for publiction in Phys. Rev.

Consumo de energia por ovinos alimentados com silagens de sorgo em diferentes estádios de maturação.

O consumo de energia foi avaliado em ovinos, utilizando-se câmaras respirométricas de fluxo aberto, para as silagens de três híbridos de sorgo (BRS 610, BR 700 e BRS 655) colhidas em três estádios de maturação dos grãos (leitoso, pastoso e farináceo). O delineamento experimental utilizado foi inteiramente casualizado em desenho fatorial 3x3, sendo três híbridos e três estádios de maturação (idades de corte) e cinco repetições (carneiros). A silagem do BRS 610 colhida no estádio pastoso proporcionou maior consumo de energia líquida do que quando colhida no estádio leitoso. Já o BRS 655 apresentou maior consumo de energia líquida quando colhido no estádio pastoso em relação ao estádio farináceo. Para o BR 700 não houve influência da idade de corte sobre esse parâmetro

Finite elements versus experimental for a CFRP structure

The work presented herein is part of a project focused on the optimization of a carbon fibre reinforced epoxy matrix (CFRP) structure. The implemented process resorts to finite elements modelling in order to evaluate the performance of the analysed structure. To validate the finite elements model at the basis of the optimization process a scale model prototype of the composite structure was built and tested under similar loading conditions. The experimental results determined were then compared with those obtained from simulations of a built numerical model depicting the experimental set up and taken into account the mechanical and geometrical properties of the composite part, the used accessories, the interface between parts and production constraints.Portuguese Foundation for Science and Technology under project UID/CTM/50025/2013 and scholarship SFRH / BD / 51106 / 201

Impact of renal function on mortality and incidence of major adverse cardiovascular events following acute coronary syndromes

BACKGROUND: Renal failure patients have a dismal prognosis in the setting of acute coronary syndromes (ACS). Several studies have shown that this population is undertreated, benefiting less frequently from cardiovascular agents and interventions. The aim of our study was to evaluate patients hospitalized for ACS who also presented renal dysfunction, identifying baseline clinical characteristics, treatment options and prognosis. We also assessed whether renal failure was an independent predictor of mortality and cardiovascular events. METHODS: We performed an observational, longitudinal, prospective and continuous study, including 1039 consecutive patients hospitalized in a single center for ACS. Two groups were compared according to estimated glomerular filtration rate (eGFR): eGFR > or = 60 ml/min (group A) and eGFR < 60 ml/min (group B). The mean follow-up was twelve months after discharge. Multivariate analysis was used to identify predictors of mortality and major adverse cardiovascular events (MACE) in this population. RESULTS: Group B patients were older and more frequently female, and presented a higher prevalence of cardiovascular risk factors and previous cardiovascular disease, and more severe coronary artery disease. Group B also had more cases of non-ST-elevation acute myocardial infarction, as well as higher blood glucose, higher heart rate on admission, and lower left ventricular ejection fraction. Patients in group B were less frequently treated with the main cardiovascular drugs or by an invasive strategy; this group also presented higher in-hospital mortality (9.1 vs. 2.5%, p < 0.001). During clinical follow-up, survival and MACE-free rates were significantly lower in group B patients (86.6 vs. 93.6%, p < 0.001, and 76.2 vs. 86.2%, p < 0.001, respectively). Multivariate analysis showed that eGFR of < 30 ml/min was an independent predictor of in-hospital mortality (OR 6.92; C statistic = 0.87) and that eGFR of < 60 ml/min was an independent predictor of MACE during follow-up (OR 2.19; C statistic = 0.71). CONCLUSION: We found that moderate to severe renal dysfunction is common in ACS patients, and this variable was an independent predictor of mortality and MACE. However, we also found that these patients are undertreated, which may contribute to their poor prognosis. Early identification of these high-risk patients is important so that the procedures recommended in the international guidelines can be more consistently implemented

Agricultura familiar e sustentabilidade: implantação do sistema de produção integrada de frutas - PIF em áreas de pequeno produtor no semi-árido do Brasil.

Os produtores de uva e manga do Vale do São Francisco, necessitam estar capacitados e implantar o sistema Produção Integrada de Frutas - PIF (MAPA e INMETRO), para se adequarem às exigências mercado lógicas dos principais países Europeu s e dos Estados Unidos, o que aumenta nossa balança comercial e gera mais divisas para o país, aumentando também a geração de emprego s. A maior parte da manga (mais de 70%) e da s uvas de mesa (mais de 60 %) do Vale são produzidas pelos pequenos produtores (área irrigável menor que 12 ha ) que são estruturas familiares em grande parte

Mie-excitons: understanding strong coupling in dielectric nanoparticles

We theoretically analyse the hybrid Mie-exciton optical modes arising from the strong coupling of excitons in organic dyes or transition-metal dichalcogenides with the Mie resonances of high-index dielectric nanoparticles. Detailed analytic calculations show that silicon--exciton core--shell nanoparticles are characterised by a richness of optical modes which can be tuned through nanoparticle dimensions to produce large anticrossings in the visible or near infrared, comparable to those obtained in plexcitonics. The complex magnetic-excitonic nature of these modes is understood through spectral decomposition into Mie-coefficient contributions, complemented by electric and magnetic near-field profiles. In the frequency range of interest, absorptive losses in silicon are sufficiently low to allow observation of several periods of Rabi oscillations in strongly coupled emitter-particle architectures, as confirmed here by discontinuous Galerkin time-domain calculations for the electromagnetic field beat patterns. These results suggest that Mie resonances in high-index dielectrics are promising alternatives for plasmons in strong-coupling applications in nanophotonics, while the coupling of magnetic and electric modes opens intriguing possibilities for external control

Density perturbations in an Universe dominated by the Chaplygin gas

We study the fate of density perturbations in an Universe dominate by the Chaplygin gas, which exhibit negative pressure. We show that it is possible to obtain the value for the density contrast observed in large scale structure of the Universe by fixing a free parameter in the equation of state of this gas. The negative character of pressure must be significant only very recently.Comment: Latex file, 5 page