Calibration of dye solutions with artificial neural networks / Marja Marjoniemi in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXIX, N° 2 (02/1994)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXIX, N° 2 (02/1994) . - p. 39-48 Titre : Calibration of dye solutions with artificial neural networks Type de document : texte imprimé Auteurs : Marja Marjoniemi, Auteur Année de publication : 1994 Article en page(s) : p. 39-48 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In recent years artificial neural networks(ANN) have generated widespread interest and gained popularity.Numerous applications have been investigated, including pattern recognition,signal processing, process control and modeling or calibrating. ANN as a nonlinear calibraion method has been found to give superior results in calibration of nonlinearly behaving solutions.In the present study neural networks are applied to multivariate calibration of dye solutions using spectroscopic data and for producting quantitative estimates of the concentrations of a component in the mixture.Absorbance is linearly dependent on concentration only in a narrow concentration range.There exists severe overlapping of the absorption bands in multi-component dye solutions. The solutions studied here were multi-component and the concentration range of the dye to be calibrated was wide(0-975 mg/l). Thus the absorbance of the solutions changes nonlinearly as a fonction of concentration.The results are compared with the results obtained with other multivariate calibration methods; principal component regression ans partial least-squares regression. Metal complex dyes were used in making the dye solutions.The absorbance spectra of the samples were measured in the visible range of light. The sigmoid output function was used in the hidden layer of the network to perform nonlinear fitting. En ligne : https://drive.google.com/file/d/1iSG5xjvWcwGVeKJJv-H9TkVNiFC-bSBP/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8112 [article]

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Studies on multicomponent spectroscopic analysis of dye solution / Marja Marjoniemi in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), LXXXVII, N° 7 (07/1992)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > LXXXVII, N° 7 (07/1992) . - p. 249-258 Titre : Studies on multicomponent spectroscopic analysis of dye solution Type de document : texte imprimé Auteurs : Marja Marjoniemi, Auteur ; E. Mäntysalo, Auteur Année de publication : 1992 Article en page(s) : p. 249-258 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Absorbance measurements of dyes in solution are used in dye characterization,in setting up dyeing recipes, or in monitoring the progress of dyeing processes.Multicomponent spectroscopic analysis of dye solutions was performed in this research.The spectra of a set of dye solutions which contained either three or four different dye components were recorded.Several ordinary multivariate regression methods such as K-matrix,P-matrix and Q-matrix least-squares regressions and factor based methods such as Principal Component Regression and Partial Least-Squares Regression were applied for the calibration, and the results were compared.The Partial Least-Squares method gave best results, especially in the case of four dyes.Conventional multivariate methods can not resolve severe overlapping of the spectra of the dyes in the visible region of light. 1:2 metal complex dyes were used in this research and the aging and the tendency to aggregate of the dyes were examined.The dyeing system used is made up of the primary colors yellow,red,and blue,plus a brown. A VIS-spectrophotometer was applied for measuring the spectra of the dye solutions and L*a*b* values of some leather processing chemicals.The L*a*b* values were used when calculating color differences delta & delta E for determining whether there would exist change in color versus time. delta & delta E or gray scale are usually used for assessing change in color when testing color fastness of leather.When the value of delta & delta E is known, it is easy to quantify the change. En ligne : https://drive.google.com/file/d/15dkuc8Z2EQjSYmIM2cluhi0y--Lo8DK8/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8286 [article]

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