No abstract

Forest fragments in urban areas comprise important habitats for a wide variety of species, however, conservationist policies for their maintenance and conservation are still incipient. This study examined the richness and abundance of the ground-spider assemblage in five forest fragments, with areas ranging between 18.5 and 103.98 ha, in the urban perimeter of Sinop, northern Mato Grosso State, southern Amazon region of Brazil. Sampling was carried out using the mini-Winkler extractor and pitfall traps in the dry (July) and rainy (November) seasons of 2017. All fragments were characterized in relation to the area and the Index of Biotic Integrity (IBI), to assess the effect of these variables on richness and abundance of soil spider assemblage. A total of 653 spiders were sampled, corresponding to 25 families and 52 species. Salticidae, Theridiidae, Lycosidae, Linyphiidae, Oonopidae and Symphytognathidae were the most abundant families (63.3% of the total sample). The assemblage was characterized by the dominance of hunting spiders (393 ind.; 60.2%) over web-building spiders (260 ind.; 39.8%). Greater spider abundance and richness was obtained during the rainy season (517 ind.; 79.2%; 41 spp.) as compared with the dry season (136 ind.; 20.8%; 24 spp.). Only 13 species occurred in dry and rainy season. Two species were recorded for the first time in the Amazon region, namely, Anapistula aquytabueraRheims & Brescovit, 2003 (Symphytognathidae) and Opopaea concolor (Blackwall, 1859) (Oonopidae). Species richness was not affected by IBI and area of fragment. Although the statistical model is not significant, species richness increases slightly with IBI and area of fragment. Similarly, abundance of spiders was not affected by IBI and area of fragment. Regardless of the area size, all evaluated forest fragments showed a low and regular IBI, demonstrating that these habitats have suffered with the pressures inherent from the urban perimeter, including the constant expansion of human occupation as well as misuse by the population. Nonetheless, these same fragments revealed considerable richness of species of ground spiders and can thus be categorized as important habitats for the maintenance of regional biodiversity. Therefore, action strategies must be set out to ensure their conservation.

RESUMO: Este estudo teve como objetivo avaliar o emprego de diferentes métodos de propagação de ondas ultrassonoras para estimativa das propriedades mecânicas de dez madeiras amazônicas. Para tanto, amostras de madeira de angelim-pedra, amescla, cambará, canelão, cedrinho, cumaru, garapeira, itaúba, jatobá e sucupirapreta foram submetidas a ensaios de ultrassom por meio do emprego de métodos direto, indireto e semidireto de propagação das ondas, sendo determinada a velocidade ultrassônica e o módulo de elasticidade dinâmico. A acurácia de cada método de propagação das ondas ultrassonoras foi avaliada a partir de testes destrutivos de compressão paralela, com determinação dos módulos de elasticidade e de ruptura. O módulo de elasticidade dinâmico obtido por meio dos ensaios de ultrassom foi eficiente na predição dos módulos de elasticidade e de ruptura à compressão paralela. O método direto de propagação das ondas de ultrassom possibilitou a obtenção de melhores resultados para estimativa das propriedades mecânicas, em comparação aos métodos semidireto e indireto. Palavras-chave: ultrassom, ensaios não destrutivos, módulo de elasticidade, módulo de ruptura, madeira tropical. Mechanical properties of Amazonian woods estimated by ultrasound waves propagation methods ABSTRACT: This study aimed to evaluate the use of different ultrasound waves propagation methods to estimate the mechanical properties of ten Amazonian woods. Therefore, angelim-pedra, amescla, cambará, canelão, cedrinho, cumaru, garapeira, itaúba, jatobá and sucupira-preta woods were subjected to ultrasound tests using direct, indirect and semi direct methods of waves propagation in which ultrasound velocity and dynamic modulus of elasticity were determined. The accuracy of each ultrasound waves propagation method was evaluated from destructive tests of parallel compression, with determination of modulus of elasticity and rupture. The dynamic modulus of elasticity obtained by the ultrasound tests was efficient in the prediction of the modulus of elasticity and rupture in parallel compression. The direct method of ultrasound waves propagation allowed to obtain better results to estimate the mechanical properties, in comparison to the semi direct and indirect methods.

No abstract

Atherosclerosis represents the restriction of blood flow in the heart muscle and is one of the main causes of death in the world. The assessment of atherosclerosis is challenging and is currently evaluated by the Fractional Flow Reserve (FFR) and the Quantitative Flow Ratio (QFR). Both exams are based on angiography, which is the gold standard for geometrical assessment. This study presents a pipeline to automatically determine the presence of narrowing in the right coronary artery (RCA) angiography exams, segmenting the artery silhouette, selecting regions of interest (ROIs) followed by a classification model. Initial results suggest a valid sequence of steps to classify the lesion, but require some improvements in the network architecture for better classification accuracy.