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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.

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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.

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.

O mercúrio (Hg) é considerado internacionalmente como um poluente global e possui alta taxa de dispersão a partir das suas fontes de emissão, devido ao transporte atmosférico. Considerando que esse metal é proveniente, tanto de fontes naturais, quanto antrópicas, é importante saber o quanto de Hg é emitido, as concentrações observadas no ambiente e estimar seus impactos sobre a saúde humana e dos ecossistemas. Dessa maneira, este estudo avaliou a presença de mercúrio no perímetro urbano de seis municípios na região norte de Mato Grosso, sul da Amazônia, por meio da análise de folhas da espécie arbórea Oiti, Moquilea tomentosa Benth. (Chrysobalanaceae), amplamente utilizada na arborização urbana nessa região. Os resultados evidenciaram diferenças significativas nas concentrações de mercúrio entre os municípios avaliados (ANOVA = p≤ 0,0001), indicando a presença desse metal pesado na atmosfera em todos os perímetros urbanos avaliados. O maior valor médio de Hg foi observado em Paranaíta (172,8 µg Kg-1), seguido por Alta Floresta (62,1 µg Kg-1), Carlinda (52,3 µg Kg-1), Nova Canaã do Norte (25,5 µg Kg-1), Colíder (19,3 Kg-1) e Nova Santa Helena (6,8 µg Kg-1). Entretanto, todas essas concentrações encontram-se dentro da faixa considerada aceitável. Assim, recomenda-se o uso de M. tomentosa como indicadora da deposição atmosférica de mercúrio em áreas urbanas, com a necessidade de estudos seguindo uma série temporal permitindo o estabelecimento de protocolos específicos para diferentes tipos de poluentes atmosféricos.

At present, over 50 hydrocarbon accumulations have been discovered in the Campos Basin, six of them corresponding to giant oil fields, located in deep waters. In most of these accumulations, a very important factor is the complex reservoir distribution, requiring fine tunned exploration, appraisal and development tools. In this scenario, 3-D seismic method has been playing a majorrole. As a typical risk minimizing tool, 3-D seismic surplus the conventional wisdom which directed the 3-D efforts towards the optimization of appraisal well location. Today, in the Campos Basin, the same technique is already considered a standard tool for earlier and later stages in the Exploration & Production processes. The main benefit of using 3-D seismic data is positioning the wells in predictable areas of better reservoir conditions and eventually, allowing the identification of fluid types, enhancing discoveries and production. A historical comparison of extort and results in the Campos Basin indicates an improvement in performanceand a progressive reduction in the number of wells, at the expense of an increase in 3-D seismic application. At the same time, the overall expenditure in explorationdecreased, while production and reserves increased. INTRODUCTION The Campos Basin is located offshore Rio de Janeiro state, southeastern Brazil. It extends roughly from thecoast line to the 3,400m isobaths and covers an area of about 100,000km2 (Fig. 1). Exploration activities began in 1968 with seismic investigation and exploratory drilling started in 1971. The ontinuous exploratory activity led to the discovery of thefirst commercial oil accumulation in 1974, Garoupa field, in Albian carbonate reservoirs. Alter the first discovery, an aggressive exploratory program was carried on in the Campos Basin with intensive seismic acquisition and drilling activities, holding the basin today the largest oil reserve in Brazil. So far, over 50 oil accumulations have beendiscovered, including six giant oil fields in deep waters. Around 600 exploratory wells have been drilled and365.000km of seismic data lines have been acquired including 248.000km of 3-D seismic, most of them in deep waters. After nearly two decades of the first commercial discovery, the Campos Basin total reserves (proven, probable and possible) reached, by the end of 1994, 7.9 billion the barrels of equivalent oil, which represents 77% of the Brazilian reserves. The present production is 525 housand barrels of equivalent oil per day corresponding to 61% of the total Brazilian production. TECTONIC AND SEDIMENTARY EVOLUTION The origin of the Campos Basin is related to the breakup of the Gondwana super continent and the drifting apart of the South American and African plates. Two structural styles can be observed in the basin. The oldest one is related to Early Cretaceous block faulting affecting mainly pre-Aptian rift sediments and basement voicanics. The youngest one is mainly relatedto post-Aptian salt tectonics 12 including extensional structures such as listric faults. The rift phase in the Early Cretaceous is represented by a series of horsts and grabens, oriented according to structural patterns from the Precambrian shield.

A movimentação de agroquímicos na cadeia produtiva é imensa, oportunizando roubos, mal uso e evasão de impostos. O controle atual é precário e necessita de melhorias, possibilitando um vasto campo de pesquisa. Conforme a literatura na área, as propostas atuais de rastreabilidade usam apenas poucos sensores, além do fato de não existir combinação e integração entre eles. Nesse contexto, este trabalho apresenta um modelo que permite a rastreabilidade de defensivos agrícolas, combinando sensores de Internet das Coisas (IoT), aprendizado de máquina, redes de neblina (fog), identificação por rádio frequência (RFID) e blockchain. O diferencial do modelo está na contribuição de uma proposta modular e que permite segurança e confiabilidade no controle dos produtos. O modelo desenvolvido apresentou resultados concisos e promissores. Quando realizada a movimentação de objetos dentro de containers e fora destes, sensores capturam e enviaram os dados das ações para armazenamento e análise das camadas seguintes do modelo.