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Quantification of the microstructures of hypoeutectic white cast iron using mat...

This paper describes an automatic system for segmentation and quantification of the microstructures of white cast iron. Mathematical morphology algorithms are used to segment the microstructures in the input images, which are later identified and quantified by an artificial neuronal network. A new computational system was developed because ordinary software could not segment the microstructures of this cast iro...

Drilling tool geometry evaluation for reinforced composite laminates

In this work, a comparative study on different drill point geometries and feed rate for composite laminates drilling is presented. For this goal, thrust force monitoring during drilling, hole wall roughness measurement and delamination extension assessment after drilling is accomplished. Delamination is evaluated using enhanced radiography combined with a dedicated computational platform that integrates algorit...

Evaluation of delamination damage on composite plates using an artificial neura...

Drilling carbon/epoxy laminates is a common operation in manufacturing and assembly. However, it is necessary to adapt the drilling operations to the drilling tools correctly to avoid the high risk of delamination. Delamination can severely affect the mechanical properties of the parts produced. Production of high quality holes with minimal damage is a key challenge. In this paper, delamination caused in lamina...

99mTc Auger electrons for targeted tumour therapy : a review

Purpose: Targeted radiotherapy using Auger electrons presents multiple advantages and challenges. The advantageous characteristics of this type of radiotherapy can explain the growing interest in these specific electrons for cancer therapy. During the last decade, Technetium-99m (99mTc) has been used as an imaging agent and only recently has it been analyzed as a potential therapeutic agent. This paper aims to ...

Method for iris recognition based on its internal region

In the recent years, the recognition of individuals through the characteristics of the iris has become a well accepted practice due to its high reliability and non-invasive nature. The majority of the methods used in the solutions proposed for iris recognition seek for information over the entire region of the iris, which leads to very high computational costs, particularly for real-time applications. Consideri...

Processamento e análise de imagem em Engenharia Biomédica

Registration of pedobarographic images

In this study, we compare the performance of six fully automatic methods of within-subjects pedobarographic image registration: principal axes, modal matching, min(XOR), min(MSE), contours-based and frequency-based. These algorithms were tested on 30 control image pairs considered in previous studies. The accuracy was assessed by visual inspection and using the image similarity measures: exclusive-or (XOR) and ...

Actividade muscular durante a marcha segundo diferentes velocidades

Segmentation of skin lesions using active contours initialized by region growing

Tool effects on hybrid laminates drilling

Fibre reinforced plastics are increasing their importance as one of the most interesting groups of material on account of their low weight, high strength and stiffness. To obtain good quality holes, it is important to identify the type of material, ply stacking sequence and fibre orientation. In this paper, the drilling of quasi-isotropic hybrid carbon+glass/epoxy plates is analyzed. Two commercial drills and a...