Browsing by Issue Date, starting with "2021-01-25"
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- Short-term forecasting photovoltaic solar power for home energy management systemsPublication . Bot, Karol; Ruano, Antonio; Ruano, MariaAccurate photovoltaic (PV) power forecasting is crucial to achieving massive PV integration in several areas, which is needed to successfully reduce or eliminate carbon dioxide from energy sources. This paper deals with short-term multi-step PV power forecasts used in model-based predictive control for home energy management systems. By employing radial basis function (RBFs) artificial neural networks (ANN), designed using a multi-objective genetic algorithm (MOGA) with data selected by an approximate convex-hull algorithm, it is shown that excellent forecasting results can be obtained. Two case studies are used: a special house located in the USA, and the other a typical residential house situated in the south of Portugal. In the latter case, one-step-ahead values for unscaled root mean square error (RMSE), mean relative error (MRE), normalized mean average error (NMAE), mean absolute percentage error (MAPE) and R2 of 0.16, 1.27%, 1.22%, 8% and 0.94 were obtained, respectively. These results compare very favorably with existing alternatives found in the literature.
- Social innovation and the role of the state: learning from the Portuguese experience on multi-level interactionsPublication . Pinto, Hugo; Nogueira, Carla; Guerreiro, J. André; Sampaio, FábioThe state is facing turbulent times. Financial and economic turmoil, growing inequalities, disinvestment in public and social services, and political disenchantment are but a few problems that contemporary society is facing, while traditional policies are failing to deliver the desired results. Social innovation is a possible approach to deal with emergent social needs. Research and policy experimentation on social innovation increased in the last decade, but many questions remain open. One key interrogation regards the relation of social innovation with the state. How can the state, considering the multi-level interactions that necessarily exist between different stakeholders, promote these practices? Using the case of Portugal, and the recent implementation of a pioneer public programmed dedicated to social innovation—Portugal Social Innovation—, this article contributes to the understanding of the role the state in the promotion of social innovation and the challenges, tensions, and difficulties experienced by those involved in the sector, whether as practitioners of social innovation or as heads of public institutions responsible for assisting in the development and implementation of social innovations. The article presents data gathered from a focus group involving the representatives from key third sector associations and officials responsible for public institutions that support the implementation of social innovation at the relevant levels of government (national, regional, local). Results show opportunities and tensions between the third sector and the different levels of the state, and a difficulty to adapt the processes and practices of public administration to the dynamic and creative nature of social innovation.
- Intracellular sources of ROS/H2O2 in health and neurodegeneration: spotlight on endoplasmic reticulumPublication . Konno, Tasuku; Melo, Eduardo; Chambers, Joseph E.; Avezov, EdwardReactive oxygen species (ROS) are produced continuously throughout the cell as products of various redox reactions. Yet these products function as important signal messengers, acting through oxidation of specific target factors. Whilst excess ROS production has the potential to induce oxidative stress, physiological roles of ROS are supported by a spatiotemporal equilibrium between ROS producers and scavengers such as antioxidative enzymes. In the endoplasmic reticulum (ER), hydrogen peroxide (H2O2), a non-radical ROS, is produced through the process of oxidative folding. Utilisation and dysregulation of H2O2, in particular that generated in the ER, affects not only cellular homeostasis but also the longevity of organisms. ROS dysregulation has been implicated in various pathologies including dementia and other neurodegenerative diseases, sanctioning a field of research that strives to better understand cell-intrinsic ROS production. Here we review the organelle-specific ROS-generating and consuming pathways, providing evidence that the ER is a major contributing source of potentially pathologic ROS.