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Spectral decomposition of black coated fabrics to optimal feasible primaries / Razieh Jafari in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 6 (11/2022)
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Titre : Spectral decomposition of black coated fabrics to optimal feasible primaries Type de document : texte imprimé Auteurs : Razieh Jafari, Auteur ; Seyed Hossein Amirshahi, Auteur Année de publication : 2022 Article en page(s) : p. 1646-1653 Note générale : Bibliogr. Langues : Américain (ame) Tags : 'Tissus enduits noirs' 'Factorisation matricielle non négative' 'Reconstruction spectrale' Index. décimale : 535.6 Couleur Résumé : In this paper, the reflectance spectra of a series of black coated fabrics were decomposed to a limited number of feasible spectra that could be collected as optimal primaries. In fact, the possibility of finding the optimal feasible vectors with the capability of matching the spectral space of black samples was investigated. In this way, the application of non-negative matrix factorization (NNMF) method was examined on spectral dataset of 363 black coated fabrics to derive the non-negative basis functions. The extracted primaries were then employed for spectral matching of black samples where, one to three non-negative spectra were employed as optimal colorants. Results showed that both the spectral and colorimetric reconstruction errors decreased by increasing the number of primaries while applying of 3 non-negative feasible bases could mimic the spectral behaviors of black samples well. Besides, the role of chromatic primaries in two and three bases system was found very important due to better replication of reflectance spectra that matches the tint effect of blacks. Note de contenu : - Table 1 : Results of reconstruction of reflectance spectra of 363 black coated fabrics using the normalized non-negative vectors
- Table 2 : The chromaticity coordinates of two non-negative primaries extracted from the reflectance spectra of 363 black coated fabrics by 10 repetitions of ALS algorithm
- Table 3 : The chromaticity coordinates of three non-negative primaries extracted from the reflectance spectra of 363 black coated fabrics by 10 repetitions of ALS algorithmDOI : https://doi.org/10.1007/s11998-021-00635-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00635-9.pdf?pdf=button Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38486
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 6 (11/2022) . - p. 1646-1653[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23804 - Périodique Bibliothèque principale Documentaires Disponible Reconstructed human epidermis as an efficient tool in the evaluation of the effects of UV irradiation and of the photoprotective capacities of a sunblock / Alain Mavon in IFSCC MAGAZINE, Vol. 7, N° 3 (07-08-09/2004)
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Titre : Reconstructed human epidermis as an efficient tool in the evaluation of the effects of UV irradiation and of the photoprotective capacities of a sunblock Type de document : texte imprimé Auteurs : Alain Mavon, Auteur ; Christelle Gélis, Auteur ; Patricia Vicendo, Auteur Année de publication : 2004 Article en page(s) : p. 209-214 Note générale : Bibliogr. Langues : Anglais (eng) Tags : UVA 'Irradiation solaire' 'Expression P53' Produit antisolaire' 'Modèle alternatif' 'Reconstruction de l'épiderme humain' Index. décimale : 668.5 Parfums et cosmétiques Résumé : Solar or UVA (ultraviolet A) irradiation of the skin causes biological damage, including apoptosis, which is evident in the form of sunburn cells and the overexpression of p53. These two parameters, as well as the measurement of cellular viability, were used to evaluate the effects of UV irradiation on a reconstructed human epidermis (RHE) model, with and without the photoprotection of a broad spectrum sunblock. Reconstructed epidermis models were irradiated by solar spectrum (420 mJ cm–2) or UVA (20 J cm–2). In the absence of irradiation, and with irradiation doses of 420 mJ cm–2 and 20 J cm–2, viability was estimated at 95, 12 and 70% respectively. Sunburn cells per cm were evaluated at 0, 41 and 22, respectively under these same conditions. The apoptotic response was studied through the expression of p53, which increased at first and was then followed by a specific cleavage, 24 h after irradiation at 420 mJ cm–2. However, in the presence of a broad spectrum sunblock preparation (a combination of OMC, MBTBP, TiO2 and ZnO) and after irradiation at 420 mJ cm–2 and 20 J cm–2, viability increased to 40 and 85% respectively. The number of sunburn cells (SBC) per cm fell to 12 and nine respectively. The photoprotection provided by the sunblock limited the increase in the expression of p53 and resulted in the total disappearance of the cleavage. This study shows that human reconstructed epidermis is a valid skin model for use in the evaluation of the effects of solar and UVA irradiation, as well as in the testing of the efficacy of sunfilters. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10476
in IFSCC MAGAZINE > Vol. 7, N° 3 (07-08-09/2004) . - p. 209-214[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 003884 - Périodique Bibliothèque principale Documentaires Disponible