DSpace Collection:http://hdl.handle.net/10174/9732024-03-29T15:16:13Z2024-03-29T15:16:13Z“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