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Load forecasting, the importance of the probability “tails” in the definition o...
Santos, P. J.; Rafael, Silviano; Pires, A. J.The load forecast is part of the global management of the electrical networks, namely at the transport and distribution levels. This type of methodologies allows to the system operator, to establish and take some important decisions concerning to the mix production and network management, with the minimum of discretionarity. The load forecast in particularly the peak load forecast, represents an important econ...
An Adaptive PID Speed Controller for an 8/6 Switched Reluctance Machine
Rafael, Silviano; Santos, P. J.; Pires, A. J.This paper presents a classical controller with parameters adaptation capability, in an automatic way. This controller is based on a PID where a parameters adaptation algorithm is used and applied to the switched reluctance motor (SRM) speed control. This PID design do not require any kind of adjustment or calibration from the operator. The parameters adaptation algorithm implemented is based on one fuzzy syste...
Designing the input vector to ANN-based models for short-term load forecast in ...
Santos, P. J.; Martins, A. G.; Pires, A. J.The present trend to electricity market restructuring increases the need for reliable short-term load forecast (STLF) algorithms, in order to assist electric utilities in activities such as planning, operating and controlling electric energy systems. Methodologies such as artificial neural networks (ANN) have been widely used in the next hour load forecast horizon with satisfactory results. However, this type o...
Short-term load forecast using trend information and process reconstruction
Santos, P. J.; Martins, A. G.; Pires, A. J.; Martins, J. F.; Mendes, R. V.The algorithms for short-term load forecast (STLF), especially within the next-hour horizon, belong to a group of methodologies that aim to render more effective the actions of planning, operating and controlling electric energy systems (EES). In the context of the progressive liberalization of the electricity sector, unbundling of the previous monopolistic structure emphasizes the need for load forecast, parti...
Pelvic presentation.
Neves, J; Serviço de Ginecologia e Obstetrícia, Hospital de Santa Maria, Lisboa.; Santos, P J; Azevedo, I; Arteaga, M P; Cruz, A SLabour is very important in breech presentation and it is associated to significant morbidity and mortality enhancement in recent years. The authors made a retrospective study of breech presentation and labour with this kind of fetal presentation, in Santa Maria Hospital in 1993 and analysed the following data: maternal age, parity, gestational age, the mode of delivery, the fetal weight, the maternal and fetal...
Reduced and oxidized glutathione of the placenta in pregnancy complicated by pr...
Neves, J; Serviço de Obstetrícia e Ginecologia, Hospital de Santa Maria, Lisboa.; Cruz, A S; Azevedo, I; Vaz, A C; Vasco, P; Santos, P J; Bicho, M PSignificative enhancement of free radical formation (FRO) in vivo is an important feature of hypertensive disorders of pregnancy (HDP), namely preeclampsia (PIH). The latest investigations about the pathology of HDP, showed the contribution of placental circulation to the development and evolution of such disease. The placental bed can be a potential source of FRO or activation of cells that can produce FRO. Gl...
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