DSpace Community:http://hdl.handle.net/10174/372024-03-28T17:00:47Z2024-03-28T17:00:47ZMUSMAR based switching control of a solar collector fieldRato, LuisBorrelli, DonatoMosca, EdoardoLemos, João MBalsa, Pedrohttp://hdl.handle.net/10174/159802020-02-11T16:53:35Z1997-01-01T00:00:00ZTitle: MUSMAR based switching control of a solar collector field
Authors: Rato, Luis; Borrelli, Donato; Mosca, Edoardo; Lemos, João M; Balsa, Pedro
Editors: Aeyels, Dirk
Abstract: This paper presents a switching controller for the distributed collector eld of a solar
power plant. The switching control strategy has been used to cope with the changes in plant dynamic behavior induced by di erent operating conditions. The underlying predictive models and controllers were designed using the MUSMAR adaptive algorithm. Experimental results obtained at Plataforma Solar de Almeria (in Spain), are presented.1997-01-01T00:00:00ZUsing Support Vector Machine Model for Fault Detection along a Water canalDuarte, JRato, LRijo, Mhttp://hdl.handle.net/10174/126002015-02-18T12:24:59Z2014-10-31T00:00:00ZTitle: Using Support Vector Machine Model for Fault Detection along a Water canal
Authors: Duarte, J; Rato, L; Rijo, M
Editors: Alexandre, L; Proença, H; Fazendeiro, P
Abstract: This paper reports a work in progress, the training of a Support Vector Machine model to detect faults in an experimental water supply canal. The work took place at the experimental canal of Núcleo de Hidráulica
e Controlo de Canais at the Universidade de Évora. The main objective is to identify faults in the water depth sensors and to detect unauthorized water withdrawals using pattern recognition. The preliminary accuracy
tests, in and out of sample, have shown an accuracy over 90% to identify 28 different patterns.2014-10-31T00:00:00Z“The Political History of Nineteenth-Century PortugalBaiôa, Manuelhttp://hdl.handle.net/10174/116072014-10-17T15:27:05Z2003-01-01T00:00:00ZTitle: “The Political History of Nineteenth-Century Portugal
Authors: Baiôa, Manuel
Abstract: The political history of nineteenth-century Portugal was, for a long time, a neglected
subject. Under Salazar's New State it was passed over in favour of earlier periods from
which that nationalist regime sought to draw inspiration; subsequent historians preferred to
concentrate on social and economic developments to the detriment of the difficult evolution
of Portuguese liberalism. This picture is changing, thanks to an awakening of interest in
both contemporary topics and political history (although there is no consensus when it
comes to defining political history). The aim of this article is to summarise these recent
developments in Portuguese historiography for the benefit of an English-language audience.2003-01-01T00:00:00ZTime scaling internal state predictive control of a solar plantSilva, Rui NevesRato, LuisLemos, Joãohttp://hdl.handle.net/10174/94502015-03-31T13:35:07Z2003-12-01T00:00:00ZTitle: Time scaling internal state predictive control of a solar plant
Authors: Silva, Rui Neves; Rato, Luis; Lemos, João
Abstract: The control of a distributed collector solar field is addressed in this work, exploiting the plant's transport characteristic. The plant is modeled by a hyperbolic type partial differential equation (PDE) where the transport speed is the manipulated flow, i.e. the controller output. The model has an external distributed source, which is the solar radiation captured along the collector, approximated to depend only of time. From the solution of the PDE, a linear discrete state space model is obtained by using time-scaling and the redefinition of the control input. This method allows overcoming the dependency of the time constants with the operating point. A model-based predictive adaptive controller is derived with the internal temperature distribution estimated with a state observer. Experimental results at the solar power plant are presented, illustrating the advantages of the approach under consideration.2003-12-01T00:00:00Z