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Browsing by Issue Date, starting with "2014-06"

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  • Viver através da lente : um novo interface social ou a forma contemporânea de experienciar o real?
    Publication . Santos, David Rodrigues dos
    This paper begins with the assertion, made by Jean Baudrillard, that the technologically mediated image has a strong predisposition to perversity. Starting with this approach, we have situated this analysis between the contact line of the artistic productions created with the aid of technology and the representations of the self through social networks. To this end, we have postulated three key concepts in which we highlight the role of the mediated image in artistic practices at the turn of the 20th century, in particular with the Fluxus movement. Secondly, we’ll discuss the underlying process of the informational aesthetics and the dialogical communication based on artworks created to operate in the communication and information network and, finally, we’ll conclude with a consideration of the importance that this interfaces grasp in shifting the way we experience the real.
    2014-06Conference object Open access Show more
  • 2014-06Book part Restricted access Show more
  • A methodology to evaluate the performance and consumption of vehicles in comparative on-road tests
    Publication . Ghodsirad, Mohammadhossein; Teixeira, Joao; Breda, Paulo; Campos, Cristina; Serrano, Luis; Silva, Manuel Gameiro da
    The main objective of the reported work was to develop a methodology to assess the fuel consumption and the efficiency of the propulsion system of passenger cars equipped with internal combustion engines in road tests carried out to compare the performance of fuels with different formulations. The examination has been done out in highway travels. A Peugeot 407 HDI station wagon, with a 2,0 liter engine, has been equipped with different measurement systems. The measurement equipment is based upon two vehicle data loggers. A real-time fuel consumption metering system is combined with a GPS logger in order to analyze trip fuel consumption with different conditions in speed and altitude. An OBD II data logger is also mounted and the analog outputs of two pressure sensor are also connected to it. OBD II provides the vehicle and engine information available at the CPU unit, while the pressure sensors are connected to three pressure taps placed on the front of the vehicle to provide information about the relative velocity between the car and the air and the flow angularity. In the test, the impacts of speed, acceleration, road slope and wind disturbance on fuel consumption were analyzed for different fuel formulations. The developed system revealed to be well adapted to the requirements of the research project, allowing an accurate measurement of the fuel consumption and all the relevant parameters related to the vehicle movement. The best compromise in terms of sampling parameters has been achieved with a data acquisition frequency of 10 Hz, being the values decimated to 1 Hz, with the exception of the fuel consumption that is analyzed for 10 s integration intervals.
    2014-06Conference paper Open access Show more
  • Study of the driver’s behavior when cornering and characterization of safe speed perception
    Publication . Brás, M.; Ferreira, Carlos Daniel Henriques; Neves, Carlos
    Recently, there has been a growing interest in research towards autonomous vehicles, aiming to improve efficiency, safety, comfort and to eliminate human errors. However, a question arises: what should set the speed of the vehicle? The road legal limit, the maximum possible given the traffic conditions, the road critical speed or any other matter? Moreover, it has been mentioned in literature that drivers feel unsafe when using cruise control systems, namely in cornering conditions. Therefore, to study the driver’s behaviour when cornering, a test vehicle was equipped with a dedicated data acquisition system to acquire the vehicle dynamics and the driver heart rate. Trials with volunteers were carried out on a 22 km selected route, consisting of multiple types of roads, from city roads to highways. Based on the field results, we propose a control strategy for the vehicle speed when cornering relating the curve radius with the centrifugal acceleration. The proposed control strategy could be easily adopted by advanced driver assistance systems and autonomous vehicles. The reproduction of a human-like behavior will enhance the perception of safety and comfort of both the driver and occupants.
    2014-06Conference paper Open access Show more
  • Energy management in municipal solid waste treatment: A case study of a mechanical biological treatment facility
    Publication . Bernardo, Hermano; Oliveira, Filipe Tadeu; Quintal, Edgar
    Over the last few years, mechanical biological treatment systems for municipal solid waste have been introduced in many European countries. In most cases, this was driven by the European Union Landfill Directive, which requires the diversion of biodegradable municipal waste from landfill to alternative processes. Although this type of treatment allows energy recovery from municipal solid waste, the process of mechanical biological treatment appears to be an intensive energy consumer, due to high demand of electricity consumed by process equipment. This paper presents the main results of an energy audit performed to a Mechanical Biological Treatment facility in Portugal, which due to the amount of energy consumed must comply with the Portuguese Program called Intensive Energy Consumption Management System – SGCIE. The program was created in 2008 to promote energy efficiency and energy consumption monitoring in intensive energy facilities (energy consumption higher than 500 toe per year). Facilities operators are required to perform energy audits and take actions to draw up an action plan for energy efficiency, establishing targets for energy consumption reduction and greenhouse gases emissions indexes. To implement actions that improve energy efficiency, it is necessary for the facilities operation to be associated with an effective energy management methodology, as well as an efficient facilities management procedure. The implementation of any energy management system should start with an energy audit, which was carried out to identify potential energy conservation measures for improving energy efficiency, and also typical energy consumption patterns and sector/equipment load profiles. This tool gives managers the information to support decision making on improving energy performance and reducing greenhouse gas emissions. Results shown that there is a considerable potential for reducing energy consumption and greenhouse gases emissions on Mechanical Biological Treatment units. Here, as elsewhere in the industrial sector, energy efficiency can only be achieved through a continuous energy monitoring and management system.
    2014-06Conference paper Open access Show more
  • Fighting Elders’ Social and Technological Exclusion: The TV Based Approach
    Publication . Correia, Luís; Costa, Nuno; Pereira, António
    We are assisting to the fastest grow of senior population ever and that tendency has brought several challenges for governments, families and for the elderly. The society was not prepared for that. On the one hand, there are many elderly who live alone in the cities and, on the other hand, active people is moving to the cities looking for a better life while leaving behind the villages where they born and grow and the older family members. On the other side, everyone is expecting the aid of technology in order to solve or at least minimize this problem. This paper present a video-calling service targeted for elderly social and technological exclusion and promoting socialization while using recent technology embedded into well-known electronic devices like TVs. The evaluation of results showed that when assisted technology is encapsulated into everyday objects, older people can use it seamlessly, without any learning curve.
    2014-06Conference paper Open access Show more
  • 2014-06-04Master thesis Open access Show more
  • Refletindo sobre a prática pedagógica e analisando o contributo de um projeto de leitura no desenvolvimento dos hábitos de leitura dos alunos
    Publication . Bernardes, Cristina Alexandra Assis; Rodrigues, Marina Vitória Valdez Faria
    2014-06-04Master thesis Open access Show more
  • Instrumentos financeiros na gestão do risco financeiro das empresas : estudo de caso
    Publication . Botas, Inês Rodrigues; Lisboa, Inês Margarida Cadima
    2014-06-06Master thesis Open access Show more
  • 2014-06-11Master thesis Open access Show more