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The low concentration behaviour and the increase of the dielectric constant in carbon nanotubes/polymer nanocomposites near the percolation threshold are still not well understood. In this work, a numerical model has been developed which focuses on the effect of the inclusion of conductive fillers in a dielectric polymer matrix on the dielectric constant and the dielectric strength. Experiments have been carried out in carbon nanotubes/poly(vinylidene fluoride) nanocomposites in order to compare to the simulation results. This work shows how the critical concentration is related to the formation of capacitor networks and that these networks give rise to high variations in the electrical properties of the composites. Based on numerical studies, the dependence of the percolation transition on the preparation of the nanocomposite is discussed. Finally, based on numerical and experimental results, both ours and from other authors, the causes of anomalous percolation behaviour of the dielectric constant are identified.

BackgroundThe positive component of Mental Health Literacy (PMeHL) refers to a person’s awareness of how to achieve and maintain good mental health. Although explored recently, the term still lacks a clear definition among healthcare practitioners.AimTo identify the attributes and characteristics of PMeHL, as well as its theoretical and practical applications.MethodsLiterature search (using the Medline and CINAHL databases) and review, covering the last 21 years, followed by concept analysis according to the steps described by Walker and Avant approach.ResultsPositive component of Mental Health Literacy is considered one component of MHL, integrating positive mental health. The concept’s attributes include: (a) competence in problem-solving and self-actualization; (b) personal satisfaction; (c) autonomy; (d) relatedness and interpersonal relationship skills; (e) self-control; and (f) prosocial attitude. Four case scenarios (model, borderline, related and contrary cases) were used to clarify the antecedents (individual factors and social/contextual factors) and consequences (individual sphere; relational/social sphere; contextual/organizational sphere) of PMeHL.ConclusionPositive component of Mental Health Literacy is considered a component of MHL, which deserves attention throughout the lifespan, in different contexts and intervention levels. Considering PMeHL as a multi-faceted and dynamic construct will help understand the mechanisms that improve mental health and promote healthy behaviors. Priority should be given to robust primary research focused on nursing interventions that enhance and sustain PMeHL in people and families.

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Os enfermeiros estão sujeitos a que o seu bem-estar e saúde mental possam ficar comprometidos. Dois terços dos enfermeiros apresenta uma perceção negativa da sua saúde mental. A manutenção e prevenção da saúde mental dos enfermeiros é fundamental para que se prestem cuidados eficazes e de qualidade. OBJETIVO(S):. Conhecer a saúde mental de um grupo de enfermeiros de um Centro Hospitalar da região centro de Portugal e correlacionar com as variáveis sociodemográficas MÉTODOS: Estudo quantitativo, descritivo-correlacional, transversal. A amostra, não probabilística de conveniência, foi composta por 83 enfermeiros. O questionário foi constituído por dados sociodemográficos e a versão portuguesa reduzida do Mental Health Inventory. Foram assegurados todos os princípios éticos e formais, recorrendo-se a software estatístico para análise estatística com testes não paramétricos. RESULTADOS: A saúde mental da amostra é considerada razoável, com valores acima do ponto de corte para a possível existência de sintomas moderados de sofrimento psicológico. A dimensão depressão é a mais bem cotada e a dimensão ansiedade aquela com menor cotação média. Ocorre a prevalência de sintomas graves de depressão em 20,5% da amostra. As mulheres apresentam níveis mais baixos de saúde mental do que os homens. Os enfermeiros que trabalham em serviços psiquiátricos evidenciam maiores níveis de saúde mental comparativamente aos que não trabalham em serviços de psiquiatria CONCLUSÕES: Os enfermeiros que constituíram a amostra apresentam níveis razoáveis de saúde mental, parecendo contudo ser importante o desenvolvimento de programas para a sua promoção no contexto ocupacional.

Football is considered nowadays one of the most popular sports. In the betting world, it has acquired an outstanding position, which moves millions of euros during the period of a single football match. The lack of profitability of football betting users has been stressed as a problem. This lack gave origin to this research proposal, which it is going to analyse the possibility of existing a way to support the users to increase their profits on their bets. Data mining models were induced with the purpose of supporting the gamblers to increase their profits in the medium/long term. Being conscience that the models can fail, the results achieved by four of the seven targets in the models are encouraging and suggest that the system can help to increase the profits. All defined targets have two possible classes to predict, for example, if there are more or less than 7.5 corners in a single game. The data mining models of the targets, more or less than 7.5 corners, 8.5 corners, 1.5 goals and 3.5 goals achieved the pre-defined thresholds. The models were implemented in a prototype, which it is a pervasive decision support system. This system was developed with the purpose to be an interface for any user, both for an expert user as to a user who has no knowledge in football games.

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