



@article {3282,
	title = {Can artificial neural networks be used to predict the origin of ozone episodes?},
	journal = {Science of the Total Environment},
	volume = {488-489},
	year = {2014},
	note = {Export Date: 21 November 2014},
	month = {2014},
	pages = {197 - 207},
	abstract = {Tropospheric ozone is a secondary pollutant having a negative impact on health and environment. To control and minimize such impact the European Community established regulations to promote a clean air all over Europe. However, when an episode is related with natural mechanisms as Stratosphere-Troposphere Exchanges (STE), the benefits of an action plan to minimize precursor emissions are inefficient. Therefore, this work aims to develop a tool to identify the sources of ozone episodes in order to minimize misclassification and thus avoid the implementation of inappropriate air quality plans. For this purpose, an artificial neural network model - the Multilayer Perceptron - is used as a binary classifier of the source of an ozone episode. Long data series, between 2001 and 2010, considering the ozone precursors, 7Be activity and meteorological conditions were used. With this model, 2-7\% of a mean error was achieved, which is considered as a good generalization. Accuracy measures for imbalanced data are also discussed. The MCC values show a good performance of the model (0.65-0.92). Precision and F1-measure indicate that the model specifies a little better the rare class. Thus, the results demonstrate that such a tool can be used to help authorities in the management of ozone, namely when its thresholds are exceeded due natural causes, as the above mentioned STE. Therefore, the resources used to implement an action plan to minimize ozone precursors could be better managed avoiding the implementation of inappropriate measures. {\textcopyright} 2014 Elsevier B.V.},
	keywords = {artificial neural network, Classification, Human health, Ozone, Stratosphere, Troposphere},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84900308360\&partnerID=40\&md5=5bb79ec9cf75f45b1556274bf83ce812},
	author = {Fontes, T. and Silva, L.M. and Silva, M. P. and Barros, N. and Carvalho, A. C.}
}
@article {2441,
	title = {Improving the adhesion of poly(ethylene terephthalate) fibers to poly(hydroxyethyl methacrylate) hydrogels by ozone treatment: Surface characterization and pull-out tests},
	journal = {PolymerPolymer},
	volume = {46},
	year = {2005},
	note = {Cited By (since 1996): 6Export Date: 21 November 2012Source: ScopusCODEN: POLMAdoi: 10.1016/j.polymer.2005.08.033Language of Original Document: EnglishCorrespondence Address: Ferreira, L.; Instituto de Engenharia Biom{\'e}dica, Laborat{\'o}rio de Biomateriais, Rua do Campo Alegre, 823, 4150-180 Porto, Portugal; email: lino@mit.eduReferences: Hart, B.L., Deyo, R.A., Cherkin, D.C., (1995) Spine, 20, pp. 11-19;Bao, Q.-B., McCullen, G.M., Higham, P.A., Dumbleton, J.H., Yuan, H.A., (1996) Biomaterials, 17, pp. 1157-1167; 
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},
	month = {2005///},
	pages = {9840 - 9850},
	abstract = {This work reports a methodology to improve the adhesion between poly(ethylene terephthalate) (PET) fibers and poly(hydroxyethyl methacrylate) (pHEMA) hydrogels by treating PET with ozone. The surface chemistry of PET was examined by water contact angle measurements, X-ray photoelectron spectroscopy (XPS), infrared reflection absorption spectroscopy (IRAS) and attenuated total reflectance infrared spectroscopy (ATR-IR) yielding information about the chemical functionalities at depths upon 0.6 μm. Ozone treatment introduces several polar groups in the surface of PET through oxidation and chain scission resulting in increased wettability. These groups include mostly carboxylic and anhydride groups and in small extent hydroxyl groups. Atomic force microscopy (AFM) analysis shows that the surface of ozone-treated PET films is fully covered with spherical particles that are removed after washing the film with water. During the washing step carboxylic functionalities were removed preferentially, as demonstrated by XPS and IR analysis. According to pull-out tests, PET monofilaments and bundles treated by ozone had a higher adhesion to pHEMA hydrogels than untreated ones. The apparent interfacial shear strength is 65\% higher on pHEMA hydrogel containing an ozonated than an untreated PET monofilament. In addition, the force to pull-out an ozone-treated PET bundle from pHEMA hydrogel is ca. 81\% higher than the one observed for the untreated bundle. {\textcopyright} 2005 Elsevier Ltd. All rights reserved.},
	keywords = {Adhesion, Atomic force microscopy, Contact angle, hydrogel, Hydrogels, infrared spectroscopy, Oxidation, Ozone, ozone treatment, Ozone treatments, Poly(ethylene terephthalate), polyethylene terephthalate fiber, Polyethylene terephthalates, Polymethyl methacrylates, pull-out, Pull-out tests, Surface characterization, Surface chemistry, surface property, X ray photoelectron spectroscopy},
	isbn = {00323861 (ISSN)},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-26844540116\&partnerID=40\&md5=bebe6186e9e73c41648eedee7d5c0f61},
	author = {Ferreira, L. and Evangelista, M.B. and Martins, M.C.L. and Granja, P.L. and Esteves, J.L. and Barbosa, M.A.}
}
