Dimensionamento e conceção de vigas de rolamento dos Blondins

Tese de mestrado integrado. Engenharia Civil (Área de Especialização de Estruturas). Faculdade de Engenharia. Universidade do Porto. 201

Automação de banca didática de óleo-hidráulica

Tese de Mestrado Integrado. Engenharia Mecânica (Automação). Faculdade de Engenharia. Universidade do Porto. 201

Selecção de futebolistas infanto-juvenis : Um Estudo diferencial em jogadores de diferentes níveis de rendimento da Associação de Futebol da Madeira

Dissertação de Mestrado em Ciência do Desporto, área de especialização em Desporto para Crianças e Jovens, apresentada à Faculdade de Ciências do Desporto e de Educação Física da Universidade do Port

Watt-I-see: design and evaluation of an interactive installation using eco-feedforward strategies

In this paper, we present the design and evaluation of Watt-I-See (WISE), a tangible interactive installation aimed at probing awareness in two target audiences (children and adults) about renew able energy resources that could inform eco-feedforward strategies. Our system combines a tan gible interface representing five different energy sources, with a set of Lego™ blocks used to manipulate different weather conditions that affect the available energy mix. Through the evalu ation of WISE, our main goal was to expose users to the effort necessary to produce the energy used in our day-to-day lives. We evaluated the installation separately for children and adults. The focus on children was due to their importance in the overall household consumption and their role in future scenarios where consumers will have to adapt to the availability of renewable energy sources. The focus on adults was to observe the impact of such information in their decision mak ing regarding their routines. Our findings highlight the success of the interface in engaging chil dren and adults, creating awareness between weather conditions and energy production and the fossil-fuel energy baseline in the grid. Overall, the study highlights the importance of providing a close point-of-interaction feedback as it enables a better understanding of energy-related decisions, reactions, and availability of resources.info:eu-repo/semantics/publishedVersio

An analytical study of seismoelectric signals produced by 1-D mesoscopic heterogeneities

The presence of mesoscopic heterogeneities in fluid-saturated porous rocks can produce measurable seismoelectric signals due to wave-induced fluid flow between regions of differing compressibility. The dependence of these signals on the petrophysical and structural characteristics of the probed rock mass remains largely unexplored. In this work, we derive an analytical solution to describe the seismoelectric response of a rock sample, containing a horizontal layer at its centre, that is subjected to an oscillatory compressibility test. We then adapt this general solution to compute the seismoelectric signature of a particular case related to a sample that is permeated by a horizontal fracture located at its centre. Analyses of the general and particular solutions are performed to study the impact of different petrophysical and structural parameters on the seismoelectric response. We find that the amplitude of the seismoelectric signal is directly proportional to the applied stress, to the Skempton coefficient contrast between the host rock and the layer, and to a weighted average of the effective excess charge of the two materials. Our results also demonstrate that the frequency at which the maximum electrical potential amplitude prevails does not depend on the applied stress or the Skempton coefficient contrast. In presence of strong permeability variations, this frequency is rather controlled by the permeability and thickness of the less permeable material. The results of this study thus indicate that seismoelectric measurements can potentially be used to estimate key mechanical and hydraulic rock properties of mesoscopic heterogeneities, such as compressibility, permeability and fracture compliance.Facultad de Ciencias Astronómicas y Geofísica

Evaluation of providing military service organizations economic performance by executive dashboards

The subject of this article is to explore what are the possibilities and limitations of the use of a computerized system of executive dashboards to evaluate the providing military service organizations economic performance. This research is classified as qualitative, non-experimental, exploratory, bibliographic, documentary and case study. The main findings are associated with the fact that the use panel indicators allowed for more accurate monitoring, and in the shortest time, the performance of these organizations; viewing the most current and critical of their economic situation, allowing the identification and timely recommendations corrections; integration of information in a data platform safer; creating historical series for the preparation of studies and works with applications in Brazilian Navy and academia, and finally, facilitating the reading of the indicators for the use of new graphics and images in metrics representation

Correlaciones entre circunferencia escrotal y algunas medidas zoométricas con el peso testicular en borregos pelibuey

EI trabajo se desarrolló con el objeto de correlacionar el peso testicular con la circunferencia escrotal y algunas medidas zoométricas

Influencia de la experiencia previa del recelador sobre la detección de calores en borregas pelibuey

EI trabajo se realizó en el Campo Experimental Mocochá (INIFAP) con el objeto de evaluar la eficiencia de hembras androgenizadas y machos con el pene desviado para detectar celos en borregas Pelibuey y comparar su eficacia cuando ambos son sometidos a u

An analytical study of seismoelectric signals produced by 1-D mesoscopic heterogeneities

The presence of mesoscopic heterogeneities in fluid-saturated porous rocks can produce measurable seismoelectric signals due to wave-induced fluid flow between regions of differing compressibility. The dependence of these signals on the petrophysical and structural characteristics of the probed rock mass remains largely unexplored. In this work, we derive an analytical solution to describe the seismoelectric response of a rock sample, containing a horizontal layer at its centre, that is subjected to an oscillatory compressibility test. We then adapt this general solution to compute the seismoelectric signature of a particular case related to a sample that is permeated by a horizontal fracture located at its centre. Analyses of the general and particular solutions are performed to study the impact of different petrophysical and structural parameters on the seismoelectric response. We find that the amplitude of the seismoelectric signal is directly proportional to the applied stress, to the Skempton coefficient contrast between the host rock and the layer, and to a weighted average of the effective excess charge of the two materials. Our results also demonstrate that the frequency at which the maximum electrical potential amplitude prevails does not depend on the applied stress or the Skempton coefficient contrast. In presence of strong permeability variations, this frequency is rather controlled by the permeability and thickness of the less permeable material. The results of this study thus indicate that seismoelectric measurements can potentially be used to estimate key mechanical and hydraulic rock properties of mesoscopic heterogeneities, such as compressibility, permeability and fracture compliance.Facultad de Ciencias Astronómicas y Geofísica