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- Extensions of Dorfman’s TheoryPublication . Santos, Rui; Pestana, Dinis; Martins, João PauloEconomic impact of composite sampling is investigated in the realistic framework of tests with positive probability of false positive and of false negative results. Sensitivity and specificity when pooling samples are also discussed, using rarefaction as a framework.
- Conducting Polymer‐Based Flexible Supercapacitor DevicesPublication . Torvi, Anand I.; Naik, Satishkumar R.; Hegde, Sachin N.; Mulla, Mohemmedumar; Kamble, Ravindra R.; Mitchell, Geoffrey R.; Kariduraganavar, Mahadevappa Y.Flexible supercapacitors are gaining considerable attention because of their wide range of applications in the area of flexible electronics. Significant opportunities exist and will continue to exist for the development of flexible energy storage devices through intensive research. The level of R&D activity in the general field of energy storage technology has been rising considerably all over the world during the last two decades, because of the growing recognition of the commercial potentialities of energy storage technology. This chapter focuses on the different types of conducting polymer-based supercapacitors, incorporating polymers such as polyaniline, polypyrrole, polythiophene, and the derivatives of polythiophene. Emphasis is given to the methods of fabricating flexible supercapacitor devices. The different electrolytes employed for the development of flexible supercapacitors are discussed. In the beginning, a brief account of the principles and classification of supercapacitors is described. The chapter concludes with a consideration of the prospects for flexible supercapacitor. To compile this chapter and to provide adequate information to the readers, we have explored all the possible materials available in the literature.
- Distribution of the Number of Losses in Busy-Periods of Mx/G/1/n SystemsPublication . Ferreira, Fátima; Pacheco, António; Ribeiro, HelenaThis chapter addresses MX=G=1=n queues, i.e., single server batch Markovian arrival queues with finite customer waiting space of size n. Taking profit of the Markov regenerative structure of these systems, we develop an efficient recursive procedure to compute the probability mass function of the number of losses in busy-periods starting with an arbitrary number of customers in the system. The derived computational procedure is easy to implement and leads to a fast numerical computation of the loss probabilities. To illustrate the effectiveness of the procedure, loss probabilities are computed for a wide variety of queues, with different capacities, batch size distributions, and arrival and service parameters.
- Pareto Scale MixturesPublication . Felgueiras, Miguel MartinsPareto scale mixtures are very effective for modelling heavy-tailed data. A new class of models is described, generalizing commonly used slash distributions. Mixture properties and possible applications are discussed.
- Operation of Multi-MicrogridsPublication . Lopes, João Abel Peças; Madureira, André; Gil, Nuno; Resende, Fernanda; Nikos HatziargyriouThis chapter aims at studying the management of distribution networks with an increased Microgrid penetration, i.e. corresponding to a situation where most of the Low Voltage (LV) networks turn into active Microgrids. It is therefore assumed that the Microgrid concept is extended, leading to the development of a new concept – the Multi-Microgrid [1]. A full exploitation of this concept involves the design of new control architecture as well as the development of new management tools or the adaptation of existing Distribution Management Systems (DMS) tools.
- Sustainability Performance of Buildings in the Project Stage—Residence StudentsPublication . Heleno, Lizete; Baptista, Pedro; Marta Gregório; Oliveira, Nelson S.; Monteiro, SilviaIn recent years, the concept of sustainable construction has been promoted by demand and by regulations. Several methodologies to assess the sustainability of the construction have been spread across the world, by several countries for almost all continents. This study focuses on the most used construction sustainability assessment methodologies, which were compared with the Portuguese methodology, LiderA. It was found that the LiderA is the sustainability system with the greatest number of relevant criteria, considering the three dimensions of sustainability, environment, economy and social. Considering the 5 phases of the construction life cycle, the importance to apply these methodologies in construction is crucial in the early phases. It can help to draft the sustainability classification of the building. To apply the LiderA was used a residence of students, a building composed of apartments, in the phase of planning. All of the 40 criteria from the LiderA were classified from F to A++, according to the project of the residence of students. The final classification, as it was projected, was A, meaning that the building has an environmental performance 50% higher than usual practice. The category of criteria with the highest contribution was the category of quality of service and resilience, with a percentage of achievement greater than 50%. The local dynamics and the resources category were the categories with the lowest contribution, and they have the potential to be reevaluated by the building promoter, since it has the potential to improve the sustainability classification of the residence of students.
- Sustainability Assessment of Building Rehabilitation Solutions: The Mid 70s Portuguese BuildingPublication . Reis, Alexandre; Heleno, Lizete; Monteiro, Silvia; Oliveira, Nelson S.The Energy Performance of Buildings Directive (EPBD) establishes improvements to buildings’ comfort conditions and energy performance, bringing them closer to buildings with almost zero energy needs, namely the Nearly Zero Energy Building (NZEBs). The assessment tools for sustainable construction, more recognized internationally, are LEED and BREEAM, and in Portugal is the LiderA. The application of those tools promotes energy efficiency and decarbonization of buildings, as referred to in the Portuguese Long-Term Strategy for Building Renovation (LTRS-PT) until 2050. In this case, a house representative of the construction of the period between 1971 and 1980 in Portugal was chosen to evaluate environmental sustainability using LiderA. In the current conditions, the LiderA rating class of the house was D. To improve the performance of the building were identified balanced rehabilitation solutions without excessive automation. The presented solutions should avoid transforming the house into a complicated device with operational difficulties or specialized operation. In this way, the proposed interventions in the building and systems are based on renewable sources, prioritizing energy and water efficiency. Furthermore, as a contribution to the health and well-being of the occupants, we considered measures related to indoor air quality (IAQ) and noise minimization. In addition, the encouragement of native species has contributed to ecological enhancement. With that proposals, the house rating class using LiderA improved from class D to class A+.
- Low Cost Smart Homes for EldersPublication . Ferreira, Gabriel; Penicheiro, Paulo; Bernardo, Ruben; Mendes, Luís; Barroso, João; Pereira, AntónioThe increase in life expectancy and the consequent aging of the general population pose, nowadays, major challenges to modern societies. Most elderly people have the usual problems related to old age, like health chronic problems and sensory and cognitive impairments. Besides that, in today’s modern societies, where families have less and less time to look after for their old relatives, the isolation of the elderly is a real concern and a very current problem, which is enhanced if the elders live alone. To solve or, at least, mitigate that problem, it was developed a smart home for elders that is presented and described in this paper. The developed assistive home system, which is based on available technology, can ensure the quality of life, safety and well-being of all older adults that want or desire to live in the comfort of their home, near to their friends and in their neighborhood, instead of living in elder care centers.
- Indicator-Based Evolutionary Level Set Approximation: Mixed Mutation Strategy and Extended AnalysisPublication . Liu, Lai-Yee; Basto-Fernandes, Vitor; Yevseyeva, Iryna; Kok, Joost; Emmerich, MichaelThe aim of evolutionary level set approximation is to find a finite representation of a level set of a given black box function. The problem of level set approximation plays a vital role in solving problems, for instance in fault detection in water distribution systems, engineering design, parameter identification in gene regulatory networks, and in drug discovery. The goal is to create algorithms that quickly converge to feasible solutions and then achieve a good coverage of the level set. The population based search scheme of evolutionary algorithms makes this type of algorithms well suited to target such problems. In this paper, the focus is on continuous black box functions and we propose a challenging benchmark for this problem domain and propose dual mutation strategies, that balance between global exploration and local refinement. Moreover, the article investigates the role of different indicators for measuring the coverage of the level set approximation. The results are promising and show that even for difficult problems in moderate dimension the proposed evolutionary level set approximation algorithm (ELSA) can serve as a versatile and robust meta-heuristic.
- Natural ventilation potential on thermal comfort of a light-steel-framing residential buildingPublication . Craveiro, A.; Lopes, A.; Santos, P.; Silva, L. daNowadays, given the increasing comfort requirements that are imposed on buildings and the overall energy concerns, it is not reasonable dissociate ventilation from the thermal comfort. In fact, ventilation, as passive strategy, when properly studied and implemented on a building, may contribute to the thermal performance increase, and also, to minimize the energy expenditure required to achieve comfortable conditions with consequent improvement of building energy efficiency. In order to predict natural ventilation potential on the comfort increase, as passive strategy in a purely climatic analysis, a simplistic analysis on two different European scenarios is presented using the Autodesk Ecotect weather tool. In addition, some outcomes of numerical simulations, using Design Builder software, aims to highlight the importance of natural ventilation on the thermal behaviour of a light-steel-framing residential building: CoolHaven building