Visco-elastic regularization and strain softening

In this paper it is intended to verify the capacity of regularization of the numerical solution of an elasto-plastic problem with linear strain softening. The finite element method with a displacement approach is used. Drucker-Prager yield criteria is considered. The radial return method is used for the integration of the elasto-plastic constitutive relations. An elastovisco- plastic scheme is used to regularize the numerical solution. Two constitutive laws have been developed and implemented in a FE-program, the first represent the radial return method applied to Drucker-Prager yield criteria and the second is a time integration procedure for the Maxwell visco-elastic model. Attention is paid to finite deformations. An associative plastic flow is considered in the Drucker-Prager elasto-plastic model. The algorithms are tested in two problems with softening. Figures showing the capability of the algorithms to regularize the solution are presented

Nonextensive Quantum H-Theorem

A proof of the quantum $H$-theorem taking into account nonextensive effects on the quantum entropy $S^Q_q$ is shown. The positiveness of the time variation of $S^Q_q$ combined with a duality transformation implies that the nonextensive parameter $q$ lies in the interval [0,2]. It is also shown that the equilibrium states are described by quantum $q$-power law extensions of the Fermi-Dirac and Bose-Einstein distributions. Such results reduce to the standard ones in the extensive limit, thereby showing that the nonextensive entropic framework can be harmonized with the quantum distributions contained in the quantum statistics theory.Comment: 5 pages, LaTe

Clear and Compress: Computing Persistent Homology in Chunks

We present a parallelizable algorithm for computing the persistent homology of a filtered chain complex. Our approach differs from the commonly used reduction algorithm by first computing persistence pairs within local chunks, then simplifying the unpaired columns, and finally applying standard reduction on the simplified matrix. The approach generalizes a technique by G\"unther et al., which uses discrete Morse Theory to compute persistence; we derive the same worst-case complexity bound in a more general context. The algorithm employs several practical optimization techniques which are of independent interest. Our sequential implementation of the algorithm is competitive with state-of-the-art methods, and we improve the performance through parallelized computation.Comment: This result was presented at TopoInVis 2013 (http://www.sci.utah.edu/topoinvis13.html

Thrombus aspiration in patients with ST-elevation myocardial infarction: results of a national registry of interventional cardiology.

BACKGROUND: We aimed to evaluate the impact of thrombus aspiration (TA) during primary percutaneous coronary intervention (P-PCI) in 'real-world' settings. METHODS: We performed a retrospective study, using data from the National Registry of Interventional Cardiology (RNCI 2006-2012, Portugal) with ST-elevation myocardial infarction (STEMI) patients treated with P-PCI. The primary outcome, in-hospital mortality, was analysed through adjusted odds ratio (aOR) and 95% confidence intervals (95%CI). RESULTS: We assessed data for 9458 STEMI patients that undergone P-PCI (35% treated with TA). The risk of in-hospital mortality with TA (aOR 0.93, 95%CI:0.54-1.60) was not significantly decreased. After matching patients through the propensity score, TA reduced significantly the risk of in-hospital mortality (OR 0.58, 95%CI:0.35-0.98; 3500 patients). CONCLUSIONS: The whole cohort data does not support the routine use of TA in P-PCI, but the results of the propensity-score matched cohort suggests that the use of selective TA may improve the short-term risks of STEMI.info:eu-repo/semantics/publishedVersio

Indicadores de custos, produtividade e renda de plantios de eucaliptos para energia na região de Guarapuava, PR

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Herpetofauna, Santa Edwiges I and II hydroelectric power plants, state of Goiás, Brazil

This paper presents a check list of amphibians and reptiles of the area under the influence of Santa Edwiges I and IIsmall hydroelectric power plants on Rio Buritis, state of Goiás, Brazil. The list was the result of faunal rescueoperations carried out between 31 August and 29 September 2005 (Santa Edwiges II) and between 30 July and 12September 2006 (Santa Edwiges I). The list comprises 30 species of amphibians belonging to 16 genera and 8 families(Caeciliidae, Bufonidae, Cycloramphidae, Hylidae, Brachycephalidae, Leiuperidae, Leptodactylidae, andMicrohylidae), and 45 species of reptiles belonging to 38 genera and 16 families (Amphisbaenidae, Anguidae,Gekkonidae, Gymnophtalmidae, Polychrotidae, Scincidae, Teiidae, Tropiduridae, Anomalepididae, Leptotyphlopidae,Typhlopidae, Boidae, Colubridae, Dipsadidae, Elapidae, and Viperidae)

Influência da compactação no crescimento e na nutrição de Eucalyptus badjensis.

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Dinâmica do potássio no solo cultivado com videira de vinho fertirrigada: 1° ciclo de produção.

A fruticultura irrigada no Vale do Submédio São Francisco é uma das principais fontes de renda e emprego na região, com destaque para a prática da vitivinicultura. Com o objetivo de determinar a disponibilidade de potássio na solução do solo, em função de cinco doses (0, 20, 40, 80 e 160 kg ha-1), um experimento foi instalado na Embrapa Semiárido, em Petrolina-PE, com videiras (Vitis vinifera L.) ?Syrah? enxertadas sobre o porta-enxerto ?Paulsen? 1103 e cultivadas no espaçamento 3 x 1 m. O sistema de irrigação utilizado foi o gotejamento, com um emissor de 2 L h-1 por planta. Foram avaliadas durante o período de 111 dias as concentrações de potássio (K mg L-1), nitrato (N-NO3, mg L-1), pH e condutividade elétrica (CE, dS m-1) na solução do solo. Para extração da solução do solo, foram instalados 30 extratores de cápsulas porosas nas profundidades do solo de 0,4 m e 0,6 m. Os dados foram submetidos à análise de variância e de regressão linear e polinomial. As médias foram comparadas entre as profundidades estudadas pelo teste F a 5% de probabilidade. As dosagens estudadas apresentaram efeito significativo para a concentração de potássio, apresentando comportamento linear com acréscimo de 0,45 e 0,33 mg L-1 (nas profundidades de 0,4 e 0,6 m, respectivamente) na solução do solo para cada aumento unitário (kg ha-1) de fertilizante potássico no solo. O aumento das dosagens de fertilizantes potássicos aumentou a concentração de K na solução do solo, porém não foram observadas perdas por lixiviação deste nutriente