27 documents found, page 1 of 3
Clustering of wind speed time series as a tool for wind farm diagnosis
Martins, A. A.; Vaz, D. C.; Silva, T. A. N.; Cardoso, M.; Carvalho, A.In several industrial fields, environmental and operational data are acquired with numerous purposes, potentially generating a huge quantity of data containing valuable information for management actions. This work proposes a methodology for clustering time series based on the K-medoids algorithm using a convex combination of different time series correlation metrics, the COMB distance. The multidimensional sca...
The performance of a combined distance between time series
Cardoso, M. G. M. S.; Martins, A. A.This paper presents the comparison of a proposed measure of dissimilarity between time series (COMB) with three baseline measures. COMB is a convex combination of Euclidean distance, a Pearson correlation based distance, a Periodogram based measure and a distance between estimated autocorrelation structures. The comparison resorts to 1-Nearest Neighbour classifier (1NN) since the effectiveness of the dissimilar...
Patterns and controls on fluvial incision in the Lower Douro River (Western Ibe...
Gomes, António Alberto; Cunha, P. P.; Martins, A. A.; Stokes, M.; Fernandes, Rui Morais
Pleistocene sea-level highstands and coastal uplift in westernmost Iberia: char...
Cunha, P. P.; Gouveia, M. P.; Martins, A. A.; Falguères, C.; Voinchet, P.; Gomes, António Alberto; Bahain, J. J.; Stokes, M.; Figueiredo, S.; Shao, Q.
Tectonic reactivation of a passive margin landscape: insights from Quaternary r...
Cunha, P. P.; Martins, A. A.; Gouveia, M. P.; Gomes, António Alberto; Falguères, C.; Stokes, M.; Voinchet, P.; Cabral, J.; Bahain, J. J.; Vicente, G. de
Correlation between the fluvial terrace staircases of the lower Tejo River and ...
Gouveia, M. P.; Cunha, P. P.; Martins, A. A.; Falguères, C.; Gomes, António Alberto; Voinchet, P.; Bahain, J. J.
Geometria da unidade alostratigráfica SLD13 (ca. 3,7-1,8 Ma) no Algarve: interp...
Cunha, P.P.; Martins, A. A.; Gomes, António Alberto; Gouveia, M. P.; Tominic, T.Analysis of 1/50,000 geologic mapsallowed geometric characterization of the allostratigraphicunit SLD13(probable age- latestZanclean to Gelasian, ca. 3.7 to 1.8 Ma) in the Algarve onshore; it culminates the Cenozoicsedimentary infill. The sedimentary discontinuity at the SLD13 base (at 25 to 150 m asl) is a vast wave cutsurface, with low slope, that in the mouth of the coeval rivers is an erosive surface of del...
Using Microalgae for Converting Solar Energy into Biofuels and other Bio-products
Mata, T. M.; Caetano, Nídia; Mendes, A. M.; Martins, A. A.It is consensual that current patterns of energy consumption and usage are unsustainable in the medium to long term, as mankind still has an overwhelming dependence on fossil fuels. Various renewable energy systems are being studied, developed and implemented, with the main goals of reducing the dependence on fossil fuels, decreasing the environmental impacts, increasing energy supply and security, among other ...
The terraces straircases of Douro River at the Pocinho and Barca D’Alva sectors...
Gomes, A.; Cunha, P. P.; Lopes, F.; Martins, A. A.; Pereira, D. I.; Cabral, J.
Techniques for analysing Late Cenozoic river terrace sequences
Stokes, Martin; Cunha, P. P.; Martins, A. A.