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Drilling damage in composite material

The characteristics of carbon fibre reinforced laminates have widened their use from aerospace to domestic appliances, and new possibilities for their usage emerge almost daily. In many of the possible applications, the laminates need to be drilled for assembly purposes. It is known that a drilling process that reduces the drill thrust force can decrease the risk of delamination. In this work, damage assessment...

Treatment of persistent perineal sinus after abdominoperineal resection with gr...

Introduction: After an abdomino-perineal resection of the rectum, infection of the perineal wound is a complication observed in 7-47% of cases. Its incidence increases when associated to inflammatory bowel disease. Persistent sinus is observed in 3-69% of cases. There are various etiological factors associated with this complication; preoperative radiotherapy is the most important. There are various techniques ...

Restless Legs Syndrome in Pregnancy: a Frequent Underdiagnosed Disorder

Keywords: Pregnancy; Pregnancy Complications Restless;Legs Syndrome.

Mutual diffusion of sodium hyaluranate in aqueous solutions

The Taylor dispersion technique has been used for measuring mutual diffusion coefficients of sodium hyaluronate in aqueous solutions at T = 298.15 K, and concentrations ranging from (0.00 to 0.50) g · dm−3. The results are interpreted on the basis of Nernst, and Onsager and Fuoss theoretical equations. From the diffusion coefficient at infinitesimal concentration, the limiting ionic conductivity and the tracer ...

Navegação Entre Obstáculos Usando Um Método De Campos De Potencial Modificados

This paper describes a modified potential fields method for robot navigation, especially suited for unicycle-type non-holonomic mobile robots. The potential field is modified so as to enhance the relevance of obstacles in the direction of the robot motion. The angular speed and linear acceleration of the robot can then be expressed as functions of the linear speed, distance and relative orientation to the obsta...

Planeamento de Trajectórias usando Caminhos de Curvatura Contínua

This paper proposes a method for real-time planning of continuous curvature paths in a structured environment. The building blocks of such paths are circle segments, straight-line segments and clothoids — the later being used to smoothly adapt the curvature profile of the resulting paths. The main application for this method would be to provide guidance for autonomous vehicles in a formula one like enviro...

Polarization Mode Dispersion Measurements using Low-Coherence Interferometry

An interferometric setup for measuring Polarization Mode Dispersion (PMD), was tested. It uses a low-coherence technique in a Michelson interferometer to determine the PMD values in two reels, measuring the Differential Group Delay (DGD). The low-coherence source bounds the minimum value of DGD detected to 0,13 ps, leading to a minimum value detected around 0,14 ps. The measured PMD mean value for one reel, in ...

Priapism associated with lumbar stenosis in a dog

Priapism, a persistent long-lasting involuntary erection of the penis, is uncommon in dogs. In this report, the case of a 13-year-old male Pointer, referred to our services due to persistent exposition of the penis, is described. This condition was consecutive to an intermittent priapism situation lasting for several days, which has been initially attributed to the inflammation and haematoma associated with a p...

Avaliação das aprendizagens: Representações sociais elaboradas por estudantes d...

A avaliação envolve variáveis de contexto como dinâmicas de sala de aula e estudantes, em particular na forma como influencia os processos de aprendizagem. Estas variáveis emergem como fatores menos estudados (Fernandes, 2009). Com o objetivo de analisar as representações sociais (RS), sobre avaliação das aprendizagens, elaboradas pelos estudantes de enfermagem realizou-se estudo exploratório com 40 participan...

Margem Oeste Portuguesa