The present paper presents a two-dimensional numerical study about the geometric optimization of an ocean Wave Energy Converter (WEC) into electrical energy that has as operational principal the Oscillating Water Column (OWC). To do so, the Constructal Design fundamentals were employed to vary the degree of freedom H1/L (ratio between height and length of the OWC chamber), while the other degree of freedom H2/l (ration between height and length of chimney) was kept constant. The OWC chamber area (φ1) and the total OWC area (φ2) are also kept fixed, being the problem constraints. In this study was adopted a regular wave with laboratory scale dimensions. The main goal was to optimize the device’s geometry aiming to maximize the absorbed power when it is subjected to a defined wave climate. For the numerical solution it was used the Computational Fluid Dynamic (CFD) commercial code FLUENT®, which is based on the Finite Volume Method (FVM). The multiphasic Volume of Fluid (VOF) model was applied to treat the water-air interaction. The computational domain was represented by an OWC device coupled into a wave tank. Thereby, it was possible to analyze the WEC subjected to regular wave incidence. An optimal geometry was obtained for (H1/L)o=0.84, being this one approximately ten times more efficient then the worst case (H1/L = 0.14), showing the applicability of Constructal Design in this kind of engineering problem.

The objective of this study was to assess the quality and potential of wood from naturally fallen trees in the forest for product development and to provide subsidies for the use of raw material. The inventory of fallen trees was carried out along the road from the Experimental Station of Tropical Silviculture of the National Institute for Research in the Amazon (EEST / INPA) - Nucleus ZF-2, at km 23 of the ZF-2 road that starts to the left of km 50 of Highway BR-174 (Manaus-Boa Vista).  Only trees that had fall characteristics due to natural factors, that is, that had exposed roots, were considered for the inventory. It was also stipulated as a requirement for measurement the diameter class of trees of 25 cm ≤ DBH ≤ 45 cm. From each naturally fallen tree, the diameters (largest and smallest) and their length were measured. 5cm thick discs were removed from the trees to obtain samples for scientific identification of the wood and determination of physical properties. Based on the inventory, it was identified that many of the trees naturally fallen in the forest are in good conditions of use, considering their woody material and their volume. The Alexa grandiflora species presented the highest volume with 2,788 m³ for a single tree, followed by the species Ormósia sp. with 2,287 m³ and Protium tenuifolium Engl with a volume of 1,269 m³. Regarding the health of the inventoried trees, all from the species Byrsonima crispaJuss. had no sign of degradation, followed by the species Croton lanjouwensis and Ingá sp. The most frequent class was medium density with 9 species with a variation of 0.47g/cm3 to 0.62g /cm3. Eperua schomburgkiana Benth was the most dense with 0.78g /cm3.The levels of degradation found and the intrinsic characteristics of the species did not compromise the possibilities of using this wooden product, and can represent an excellent opportunity for economic return, contributing to minimize the pressures exerted around the living forest.

Resumo: Este trabalho tem como objetivo a confecção de um KIT postal para testes de controle de qualidade em raios X convencional. O KIT desenvolvido é composto por alguns dispositivos de fácil manipulação, tais como: teste de alinhamento, colimação do eixo central e determinação do ponto focal. Para acompanhá-lo, foi elaborado também um manual com procedimentos para realização dos testes, visando a sua realização por técnicos em radiologia. Os testes implementados no KIT tiveram seu desempenho comparado com testes regulamentados pela ANVISA (2005) existentes no mercado, e seus resultados mostraram-se compatíveis. Embora o manual de Radiodiagnóstico da ANVISA recomende dez testes de controle de qualidade para raio X convencional, só trếs deles possuem portabilidade, baixo custo sendo de simples execução para que sejam enviados pelo correio. Para os testes que continham essas três características simultâneas, sugerimos algumas técnicas de fabricação, com materiais de baixo custo sem perda de precisão. Este tipo de estratégia possibilita, que instituições localizadas a grandes distâncias de centros urbanos possam adquirir o KIT postal, diminuindo seus custos; e que membros da própria equipe radiológica assegurem o uso de níveis corretos de radiação para os seus pacientes. Palavras-chave: Raios X convencional, KIT postal, testes de controle da qualidade. Abstract: This work aims the development of a postal KIT of devices for conventional X -ray quality control tests. The KIT is composed of some easy-to-handle devices