Emociones y salud actividades propiciadoras de emociones positivas

Se parte del concepto de emoción positiva, vivida en contextos, cuya experiencia subjetiva, es auto-percibida como bienestar (Seligman & Csikszentmihalyi, 2000), razón por la que se considera aquí como promotora de Salud. Así, este estudio de carácter cualitativo organiza, con una “teoría basada en los datos”, las entrevistas semi-estructuradas, en una muestra intencional de 60 profesores. Los contenidos discursivos obtenidos se sometieron a análisis de contenido, de donde surgió un “árbol de categorías“ con 3 generaciones, alrededor de las actividades que proporcionan emociones positivas. Las actividades identificadas que proporcionan emociones positivas agregan un árbol de 13 categorías, que serán presentadas por orden decreciente de unidades discursivas: “Amor”, “Amigos” “Sentir la Naturaleza”, “Familia”, “Fare Niente”, “Pie Fuera de la Puerta”, “Musicalidad”, “Dormir”, “Lecturas”, “Trabajar en lo que nos gusta”, “Convivir”, “Baño” y finalmente, la categoría “Tener Dinero”. Se concluye que será posible proporcionar el desarrollo de estas actividades en ambiente laboral, para experienciar el bienestar subjetivo

Rheological Behaviour of PP Nanocomposites by Extrusion Process

The effect of organophilic clay (C15A) in PP compatibilized polymer (PP/PP-g-MA) through rheological experimental results is presented. This study focusses on the description of the rheological behaviour of the organophilic layers along the screws of a twin screw extruder by melting process, varying the screw profile as well as the processing conditions, namely screw speed, temperature and feed rate. Different levels of dispersion were found along the screws for all conditions and positions analyzed by rheology. The qualitative analysis of the images obtained by transmission electron microscopy, reinforced the results. Furthermore, the effects of the processing conditions on dispersion of C15A layers along the screw profile are analyzed using multiple linear regression techniques. The results show statistically significant differences of all rheology measures for all the processing conditions and positions along the extruder.info:eu-repo/semantics/publishedVersio

Bateria "Aurora" : estudos exploratórios de adaptação e validação em Portugal

No quadro de alguma insatisfação com o tipo de provas usadas pelos psicólogos na avaliação da inteligência, em particular em contextos educativos, a Universidade Yale assume nesta última década um projecto internacional de validação da Bateria AURORA. Esta bateria de provas emerge da teoria triárquica de inteligência de Robert Sternberg, e pretende avaliar habilidades cognitivas nos domínios da inteligência analítica, criativa e prática. As tarefas propostas para cada uma destas inteligências recorrem a conteúdos verbais, numéricos e figurativos, procurando sempre situações bastante apelativas (motivantes) e associadas ao quotidiano das crianças/adolescentes (validade ecológica). A Bateria aparece, ainda, mencionada como um contributo futuro à identificação de alunos com características de sobredotação, ultrapassando as limitações apontadas habitualmente aos testes de QI. Nesta comunicação, a par da descrição das provas, descrevemos os estudos qualitativos e quantitativos iniciados junto de crianças e adolescentes portugueses, tendo em vista a adaptação e validação da Bateria

Scrap production of extruded aluminum alloys by direct extrusion

The growing globalization of the different types of market requires that companies invest, in a recurrent way, to optimize and improve all the processes inherent to their activities. Aluminium extrusion is the main industrial process used to create profiles of a fixed cross-section. This process requires appropriate processing parameters to be used, in order to produce diverse profiles and high-quality products. The company’s ability to adapt and improve the productive process are differentiating factors against the competition. Thus, understand the main operations and dynamics of the companies is crucial. This work presents an empirical study concerning the extrusion process of a Portuguese company in the aluminium sector. By analysing a real data base provided by the company, the main objective is to model the aluminium extrusion process. Taking into account the variables that most influence the extrusion of different profiles, the aim is to minimize the production of scrap. First, by studying the literature in the subject, the variables that most contribute to scrap production were identified. Since the database provided by the company did not present all the variables described in literature, proxy variables were considered. Next, a multivariate linear regression model for explaining the amount of scrap taking as explanatory the identified variables was estimated. With this analysis, it was possible to identify levels of significance of the variables under study, and therefore understand how each of the variables contributes to the increase or decrease of the amount of scrap on the production of aluminium profiles. The results show that variables concerning with extrusion temperature, time, speed, pressure and die geometry are crucial to improve and control the scrap production. The obtained model will be improved, in future work, by including further variables of the extrusion process. Furthermore, factor analysis and GHML methodologies will also be considered for explaining the production of scrap and therefore improve the production process.info:eu-repo/semantics/publishedVersio

Cost reduction and quality improvements in the printing industry

Competitiveness has been the key factor for the survival of the companies. The economic crisis that marked the beginning of this millennium forced the total readjustment of processes and operations which, in some cases, gave origin to deep changes in the organizations. In addition, concerns and consequent environmental constraints have begun to increase. Printing industry was strongly influenced by these factors. This study aims to reduce the use of toxic products and general costs in offset printing process, as well as promote a productivity increase in the printing industry. Because this kind of industry is largely influenced by weather conditions, historical data was collected, allowing to reach the balance between the printing consumables usage and working methodologies, leading to implementing important improvements. At the end of the study, it was possible to observe very good results, increasing the Overall Equipment Effectiveness (OEE) and the Mean Time Between Failure (MTBF) and reducing the Mean Time To Repair (MTTR) relatively to the equipment. The biggest achievement was the massive reduction of the isopropyl alcohol consumption in the offset printing process, increasing the air quality at the facilities, reducing the costs and most of the problems during the printing process.info:eu-repo/semantics/publishedVersio

Use of laser speckle and entropy computation to segment images of diffuse objects with longitudinal motion

International audienc

Force-based higher-order beam element with flexural-shear-torsional interaction in 3D frames. Part II: Applications

The specific features of the proposed force-based formulation derived in the companion paper, which is applied for the first time to higher-order beam theories, are herein thoroughly validated. Introductory numerical examples illustrate the influence of mesh refinement, boundary conditions, and slenderness ratios for isotropic linear elastic response. Specific higher-order effects—unique to the developed element—are then suitably interpreted, as well as the formulation appropriateness to consider distributed loads and to model three-dimensional behaviour, which is verified with solid finite element analyses. Extensive comparisons against existing proposals, namely other refined higher-order beam theories, emphasize the performance of the proposed approach. Finally, the nonlinear response of the element with a multiaxial J2 linear plasticity material model is analysed, highlighting its advantages in relation to a classical force-based Euler–Bernoulli beam using a one-dimensional plastic material model with kinematic hardening

Force-based higher-order beam element with flexural–shear–torsional interaction in 3D frames. Part I: Theory

An innovative higher-order beam theory, capable of accurately taking into account flexural–shear–torsional interaction, is originally combined with a force-based formulation to derive the corresponding finite element. The selected set of higher-order deformation modes leads to an explicit and direct interaction between three-dimensional shear and normal stresses. Namely, cross-sectional displacement and strain fields are composed of independent and orthogonal modes, which results in unambiguously defined generalised cross-sectional stress-resultants and in a minimisation of the coupling of equilibrium equations. On the basis of work-equivalency to three-dimensional continuum theory, dual one-dimensional higher-order equilibrium and compatibility equations are derived. The former, which govern an advanced form of beam equilibrium, are strictly satisfied via stress fields arising from the solution of the corresponding systems of coupled differential equations. The formulation, which is numerically validated in a companion paper for both linear and nonlinear material response, inherently avoids shear-locking and accurately accounts for span loads. Finally, the superiority of force-based approaches over displacement-based ones, well established for inelastic behaviour, is also demonstrated for the linear elastic case