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Application of 3D heat diffusion to detect embedded 3D empty cracks

This paper presents a 3D boundary element model (BEM), formulated in the frequency domain, to simulate heat diffusion by conduction in the vicinity of 3D cracks. The model intends to contribute to the interpretation of infrared thermography (IRT) data results and to explore the features of this non-destructive testing technique (NDT) when it is used to detect and characterize defects. The defect is assumed to b...

Extraction with supercritical fluid and comparison of chemical composition from...

Plants differ in metabolism during their life cycle. In species used as phytotherapics, these changes determine the quality and effectiveness of the product. The aim of this study to evaluate the differences of chemical extracts obtained with supercritical CO2 from young and adult leaves of Zanthoxylum tingoassuiba St.-Hil., Rutaceae, a species used in the folk medicine in Brazil. The chemical composition of th...

2.5D BEM modeling of underwater sound scattering in the presence of a slippage ...

Frugivory on Margaritaria nobilis L.f. (Euphorbiaceae): poor investment and mim...

Dehiscent fruits of Euphorbiaceae usually have two stages of seed dispersal, autochory followed by myrmecochory. Two stages of Margaritaria nobilis seed dispersal were described, the first stage autochoric followed by ornithocoric. Their dehiscent fruits are green and after they detached from the tree crown and fall on the ground, they open and expose blue metallic cocas. We studied the seed dispersal system of...

Peroxidases ativadas por frações protéicas de extrato biológico eficaz na prote...

Uma formulação natural (VLAF) obtida da extração aquosa a frio de pó de tecido necrótico de lobeira (Solanum lycocarpum), infectado por Crinipellis perniciosa (Stahel) Singer, promoveu redução significativa no progresso da mancha foliar bacteriana (Xanthomonas campestris pv. vesicatoria), quando previamente pulverizado em folhas de tomateiro. Duas frações obtidas por precipitação salina, F0/30 e F30/60, apresen...

Sound pressure level attenuation provided by thin rigid screens coupled to tall...

This paper computes the sound pressure attenuation provided by thin rigid screens placed on the walls of a tall building to protect the building from the direct sound incidence produced by sound pressure sources placed in its vicinity. The problem is formulated in the frequency domain via the Traction Boundary Element Method (TBEM), which overcomes the thin-body difficulty arising with the classical Boundary El...

Conduction and convection phenomena through a slab with thermal heterogeneities

This paper addresses the computation of the three-dimensional transient heat transfer through a layered solid and/or fluid formation containing irregular inclusions. The use of appropriate Green's functions for a flat layer formation in a boundary element method formulation avoids the discretization of the layer interface boundaries. ; http://www.sciencedirect.com/science/article/B6TYC-4K9C6V7-2/1/96b8b86fba...

Analysis of airborne sound insulation and impact sound pressure level provided ...

This paper studies the acoustic behaviour provided by a single infinite elastic partition dividing an infinite acoustic medium, containing two-dimensional (2D) heterogeneities placed parallel to the layer's surfaces, which simulate the presence of fittings such as pipes. The problem is solved in the frequency domain using the boundary element method (BEM). Only the surfaces of the heterogeneities are discretize...

Prediction of airborne sound and impact sound insulation provided by single and...

In this work, the authors use analytical solutions to assess the airborne sound and impact insulation provided by homogeneous partitions that are infinite along their plane. The algorithm uses Green's functions, derived on the basis of previous work by the authors on the prediction of airborne sound insulation provided by single and double panels. The model is now extended to handle multilayer systems, allowing...

Desenvolvimento de um programa computacional para implantação econômica de lavo...

Desenvolveu-se um algoritmo para a implantação convencional de lavouras canavieiras e em adição, uma implantação diferenciada com a finalidade de proporcionar produções, em toneladas, iguais nos anos subseqüentes à implantação, visto que, com o passar dos anos, as produtividades da cana-de-açúcar são diferentes; contudo, a nova metodologia fica limitada à área máxima de plantio, sendo que, em alguns casos, a pr...