Encontrados 18 documentos, a visualizar página 1 de 2
Fish communities in the lower Tagus inland wetlands: from anthropogenic pressur...
Ribeiro, Diogo; Dias, Diogo; Santos, Gil; Gago, João; Serrano, Beatriz; Almeida, Luís; Martelo, Joana; Costa, Luís M.; Ribeiro, Filipe; Catalão, JoãoInland wetlands are important biodiversity hotspots and amongst the most impacted ecosystems worldwide. Conservation management and restauration actions in wetlands are thus urgently needed to reverse trends in species loss and habitat degradation, particularly in regions harbouring already endangered endemic species. Inland wetlands may play an important role in supporting endemic endangered fishes in the Lowe...
Improved voltage control for the electric vehicle operation in V2H mode as an o...
Monteiro, Vítor Duarte Fernandes; Catalão, João; Sousa, Tiago José Cunha; Pinto, J. G.; Mezaroba, Marcello; Afonso, João L.As a contribution for sustainability, electric vehicles (EVs) are seen as one of the most effective influences in the transport sector. This paper proposes an improved voltage control of the EV operating as uninterruptible power supply (UPS) in smart homes. With the EV plugged-in into the smart home, it can act as an off-line UPS protecting the electrical appliances from power grid outages. The foremost advanta...
Demand Response-Based Operation Model in Electricity Markets With High Wind Pow...
Hajibandeh, Neda; Shafie-khah, Miadreza; Talari, Saber; Dehghan, Shahab; Amjady, Nima; Mariano, S.; Catalão, JoãoThe issue of climate change has received considerable attention in recent decades. Therefore, renewable energies and especially wind units have become a central point of attention. To cope with the uncertainties of wind power generation, resulting from the intermittent nature of this kind of energy, this paper proposes a Demand Response (DR) based operation approach. In other words, unlike the previous models i...
Virtual Inertia and Mechanical Power-Based Control Strategy to Provide Stable G...
Mehrasa, Majid; Pouresmaeil, Edris; Soltani, Hamid; Blaabjerg, Frede; Calado, M. do Rosário; Catalão, JoãoThis paper presents a virtual inertia and mechanical power-based control strategy to provide a stable operation of the power grid under high penetration of renewable energy sources (RESs). The proposed control technique is based on a new active and reactive power-based dynamic model with the permanent magnet synchronous generator (PMSG) swing equation, in which all PMSG features i.e., inertia and mechanical pow...
Crop data retrieval using earth observation data to support agricultural water ...
Rolim, João; Navarro, Ana; Vilar, Pedro; Saraiva, Cátia; Catalão, JoãoAccurate crop data are essential for reliable irrigation water requirements (IWR) calculations, which can be acquired during the crop growth season for a given region using earth observation (EO) satellite time series. In addition, a relationship between crop coefficients and the NDVI can be established to allow for crop evapotranspiration estimation. The main objective of the present work was to develop a meth...
Generation of persistent scatterers in non-urban areas: the role of microwave s...
Nico, Giovanni; Oliveira, Sérgio; Catalão, João; Zêzere, JoséIn this work, we study the capability of the ground surface to generate Persistent Scatterers (PS) based on the lithology, slope and aspect angles. These properties affect the scattering behavior of the Synthetic Aperture Radar (SAR) signal, the interferometric phase stability and, as a consequence, the PS generation. Two-time series of interferometric SAR data acquired by two different SAR sensors in the C-ban...
Evaluation of single-band snow-patch mapping using high-resolution microwave re...
Mora, Carla; Jiménez Cuenca, Juan Javier; Pina, Pedro; Catalão, João; Vieira, GoncaloThe mountainous and ice-free terrains of the maritime Antarctic generate complex mosaics of snow patches, ranging from tens to hundreds of metres. These can only be accurately mapped using high-resolution remote sensing. In this paper we evaluate the application of radar scenes from TerraSAR-X in High Resolution SpotLight mode for mapping snow patches at a test area on Fildes Peninsula (King George Island, Sout...
The Impacts of Climate Change on Irrigated Agriculture in Southern Portugal
Rolim, João; Teixeira, José Luís; Catalão, João; Shahidian, ShakibClimate change projections point to increasing air temperature and reduced precipitation in southern Portugal, which would affect farming systems. This study aims to assess the impacts of climate change on irrigated agriculture in southern Portugal. These impacts were assessed by combining climate model data with a soil water balance model and a numerical model for the design of irrigation systems. Meteorologic...
Ground motion and tectonics in the Terceira Island: Tectonomagmatic interaction...
Maques, Fernando Ornelas; Catalão, João; Hildenbrand, Anthony; Madureira, PedroThe interpretation of high-resolution topography/bathymetry, GPS and InSAR data, and detailed structural geology indicate that: (1) Terceira developed at the intersection of two major volcano-tectonic lineaments: WNW-ESE(localTR'sdirection)andNNW-SSE(submarinechainofvolcanoes,here fi rstlyrecognisedandcoined Terceira Seamount Chain). (2) Terceira is affected by four main fault systems: the ca. N165° (normal fau...
Impacte das alterações climáticas nas necessidades de rega das culturas
Rolim, João; Teixeira, José Luís; Catalão, João; Shahidian, ShakibConhecidos os valores diários das variáveis meteorológicas evapotranspiração de referência (ETo) e precipitação (P) para a série de controlo e para as séries referentes aos vários cenários das alterações climáticas, pode-se estimar as necessidades de rega relativas a cada um dos cenários referidos através da simulação do balanço hídrico dos solos. Para o efeito, é ainda necessário conhecer os parâmetros hidroló...