Analytical control of leather fat by near infrared reflectance spectroscopy / H. Iturriaga in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 91, N° 2 (03-04/2007)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 91, N° 2 (03-04/2007) . - p. 47-51 Titre : Analytical control of leather fat by near infrared reflectance spectroscopy Type de document : texte imprimé Auteurs : H. Iturriaga, Auteur ; S. Maspoch, Auteur ; Trinitat Canals, Auteur ; D. Rey, Auteur Année de publication : 2007 Article en page(s) : p. 47-51 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bains de trempe -- Analyse Bains de trempe -- Teneur en matières grasses Cuirs et peaux de bovins Etalonnage Extraction par solvant Spectroscopie de réflectance Wet-blue (tannage) Peau tannée au chrome (le chrome donne une couleur bleue) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A highly expeditious method for the direct analytical control of leather fat as an alternative to the officially endorsed methods was developed based on solvent extraction. The proposed method uses multivariate calibration with partial least-squares regression (PLSR) of diffuse reflectance spectra (NIRRS) for leather specimens. The reference values of the calibration matrix are used to derive those for powdered leather extracted with methylene chloride using the official method. Two different approaches based on matrices containing spectral information for powdered leather and spectra directly recorded on unpowdered leather samples were developed. The optimum calibration model for powdered samples is based on the second spectral derivative and 3 PLS components, and provides overall relative calibration and prediction errors in the region of 5%. On the other hand, the optimum prediction model uses the first spectral derivative and 5 PLS components; the results are similarly as good as those of the calibration model, but the prediction of some external samples results in larger errors arising from the inability to construct calibration sets encompassing the whole variability of the prediction set. Fibre optic-based NIR spectroscopy in combination with multivariate calibration appears to be an effective alternative to existing methods for the analysis and control of fat in the leather tanning industry as it is a rapid method and uses no reagents. Note de contenu : - EXPERIMENTAL PROCEDURES : Leather and fat-liquoring - Samples - Apparatus and software - Recording of NIR spectra - Processing of data - RESULTS AND DISCUSSION : Powdered sample method - Direct recording method - Table 1 : Fat content in the fat-liquoring baths and values provided by the reference method (RM) - Table 2 : Relative standard errors for the calibration and prediction sets as calculated using various calibration models for the powdered (p) and unpowdered (l) samples - Table 3 : Fat content in each calibration and external prediction sample as determined using both methods (p and l) En ligne : https://drive.google.com/file/d/1jRdhYSyPRuG-TxoFtUWG6VS8NNillbld/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39032 [article]

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Assessing the performance of a spectral reflectance estimation method based on a diffraction grating and a spectroradiometer / Dejana Javorsek in COLORATION TECHNOLOGY, Vol. 130, N° 4 (08/2014)  

[article]  inCOLORATION TECHNOLOGY > Vol. 130, N° 4 (08/2014) . - p. 280-287 Titre : Assessing the performance of a spectral reflectance estimation method based on a diffraction grating and a spectroradiometer Type de document : texte imprimé Auteurs : Dejana Javorsek, Auteur ; Tim Jerman, Auteur ; Blaž Rat, Auteur ; AleÅ¡ Hladnik, Auteur Année de publication : 2014 Article en page(s) : p. 280-287 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Couleur -- Analyse Spectroscopie de réflectance Index. décimale : 667.3 Teinture et impression des tissus Résumé : Constant improvements in digital cameras have made it possible to use these devices for colour acquisition and reproduction at an advanced level. It is known that a colour match for all observers when changing illumination can only be achieved by matching spectral data. Obtaining spectral data from digital camera RGB values could provide a new way of using the digital camera as a spectrophotometric tool or as a high-quality colour-capturing system that is required in more demanding applications. In the present study, two spectral reflectance estimation methods were examined – the Imai–Berns method (ImaiBerns) and the spectral-sensitivity-based method (SpecSens). The purpose of the research was to simplify the procedure of the SpecSens method by using a diffraction grating and a spectroradiometer instead of a monochromator, and to compare the results with those of the ImaiBerns approach. Obtained spectral reflectance estimates were evaluated using the root-mean-square error and ?E00 metrics. Results of the research show that the ImaiBerns method was superior to SpecSens, most likely because the former method does not require knowledge of the camera spectral sensitivities, which often introduces errors into reflectance estimation calculations. Both methods were successful in predicting black, brownish, and dark patches, as indicated by a low root-mean-square error, as well as unsaturated pastel, pink, or skin colours, which produced low ?E00 values. On the other hand, many of the patches with a low root-mean-square error also exhibited high ?E00 values, while bright, nearly-white patches were characterised by a high root-mean-square error. DOI : 10.1111/cote.12095 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12095 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21781 [article]

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A comparison of Indonesian and Indian shellacs using specular reflectance spectroscopy / Deepika Bhatia in PAINTINDIA, Vol. LVII, N° 7 (07/2007)

[article]  inPAINTINDIA > Vol. LVII, N° 7 (07/2007) . - p. 87-94 Titre : A comparison of Indonesian and Indian shellacs using specular reflectance spectroscopy Type de document : texte imprimé Auteurs : Deepika Bhatia, Auteur ; P. C. Sarkar, Auteur ; M. Alam, Auteur Année de publication : 2007 Article en page(s) : p. 87-94 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Fourier, Spectroscopie infrarouge à transformée de Gomme-laque Réflexion totale atténuée Spectroscopie de réflectance Index. décimale : 667.9 Revêtements et enduits Résumé : Fourier Transform Infrared (FTIR) spectroscopy is well established as an analytical tool, for the determination of different functional moieties in complex matrices, including polymers and resins, both natural and synthetic. In addition to conventional KBr sampling techniques, DRIFT (Diffuse Reflectance), ATR (Attenuated Total Reflectance) and Specular Reflectance (SRS) techniques are also associated with FTIR. Specular Reflectance spectroscopy is useful in compounds having amorphous structures, as well as substances, which cannot be ground to a fine powder for KBr sampling. Such materials are therefore cast as films on reflecting surfaces and the reflectance spectra of the films are obtained, which may have to be converted to easily recognizable, transmission-type spectra, through sophisticated computerized techniques. In the present work, specular reflectance spectroscopy was utilized to ascertain molecular level differences in functional moieties of lac resin, obtained from different sources. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11496 [article]

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Determination of dyers' perceived components of colour difference (depth, brightness and hue) between two similar colours from their spectral reflectance values / Roger H. Wardman in COLORATION TECHNOLOGY, Vol. 128, N° 3 (2012)

[article]  inCOLORATION TECHNOLOGY > Vol. 128, N° 3 (2012) . - p. 161-168 Titre : Determination of dyers' perceived components of colour difference (depth, brightness and hue) between two similar colours from their spectral reflectance values Type de document : texte imprimé Auteurs : Roger H. Wardman, Auteur ; Salma Farooq, Auteur ; Ken J. Smith, Auteur Année de publication : 2012 Article en page(s) : p. 161-168 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Algorithmes Colorimétrie Spectroscopie de réflectance Teinture -- Fibres textiles Index. décimale : 667.3 Teinture et impression des tissus Résumé : The partitioning of colour differences into ΔL*, ΔC* and ΔH* is not directly equivalent to the dyer’s method of partitioning. The dyer’s method involves separation into the components of depth (ΔD), brightness (ΔB) and hue (ΔH), of which only hue difference has a qualitative (and quantitative) equivalent in the CIELAB system. Depth and brightness are important terms to dyers. Depth is related to the amount of dye taken up by a textile material and brightness to that component of colour difference that is neither depth nor hue. Brightness is best defined as the opposite of dullness, dullness being related to the amount of neutral grey present in the colour. An algorithm, called the Wardman–Smith–Farooq algorithm, has been developed to compute the dyers’ variables of ΔD,ΔB and ΔH from spectral reflectance values, enabling dyers to take full advantage of colorimetry. The algorithm is based on extensive experimental work to map surfaces of constant visual depth through the colour space and this paper describes the methodology of the calculation. The correlations of the values of ΔD,ΔB and ΔH, determined using the Wardman–Smith–Farooq algorithm with other empirical models for 117 sample pairs, are given. Note de contenu : - EXPERIMENTAL : Development of the WSF algorithm - Stages of the algorithm - RESULTS AND DISCUSSION : Comparison with the DBH and sato models - Performance of the WSF algorithm with visual assessments DOI : 10.1111/j.1478-4408.2012.00372.x Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15114 [article]

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Dry colour prediction of leather from its wet state / Malathy Jawahar in COLORATION TECHNOLOGY, Vol. 129, N° 4 (08/2013)  

[article]  inCOLORATION TECHNOLOGY > Vol. 129, N° 4 (08/2013) . - p. 252–258 Titre : Dry colour prediction of leather from its wet state Type de document : texte imprimé Auteurs : Malathy Jawahar, Auteur ; Rajangam Venba, Auteur ; Govindhan Jyothi, Auteur ; Swarna Vinodh Kanth, Auteur ; Mallinath Jinandra Doss, Auteur ; Chandra Babu Narasimhan Kannan, Auteur Année de publication : 2013 Article en page(s) : p. 252–258 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorimétrie Cuir -- Séchage Cuirs et peaux -- Teinture Spectroscopie de réflectance Tags : 'Cuir  sec'  mouillé'  'Modèle  régression'  'Teinture  cuir'  Séchage  'Spectroscopie  réflectance' Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The present investigation describes the development of a regression model for dry colour prediction based on the colour of wet leather. Such a prediction will be useful in the colour matching of leather – the time delay in drying of wet leather and determination of the final colour can be avoided. The use of computer technology interfaced with a reflectance spectrophotometer provides a novel approach to the prediction of dry colour from wet colour. In this study, five different regression models, i.e. linear fit, log fit, quadratic fit, log quadratic fit and cubic fit, were developed, with the dry reflectance of the leather sample as a dependent variable and the wet reflectance of the leather as an independent variable. The relationship between moisture content and surface leather colour, a prerequisite for enabling prediction, was studied. The obtained log quadratic model can be used for accurate prediction of dry colour from wet colour. DOI : 10.1111/cote.12033 En ligne : http://onlinelibrary.wiley.com/doi/10.1111/cote.12033/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19036 [article]

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Dyeing of cotton yarn with the aqueous extract of the leaves of Eupatorium odoratum L. in Thailand and associated extract toxicity studies / Montra Chairat in COLORATION TECHNOLOGY, Vol. 127, N° 5 (2011)  

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Effective models for correlating spectral reflectance between spectrophotometers / Yang Xu in COLORATION TECHNOLOGY, Vol. 129, N° 4 (08/2013)  

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Estimation of skin phototypes with optical parameters : an experimental study using newly developed fibre optic detection device / F. Ries in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 35, N° 1 (02/2013)  

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Fluorescent whiteness measurement of textiles by multispectral imaging system / Pengpeng Yao in COLORATION TECHNOLOGY, Vol. 140, N° 4 (08/2024)  

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Hydrodynamique Interfaciale sous Ecoulements Forts / Axel Buguin / 1998

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In vivo analysis of the interaction of antioxidants and free radicals in human skin / Jürgen Lademann in IFSCC MAGAZINE, Vol. 15, N° 4 (10-11-12/2012)

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Influencing the cutaneous carotenoid status and skin-physiological parameters by ingesting antioxidants in the form of curly-hale containing food supplements / J. Schleusener in SOFW JOURNAL, Vol. 144, N° 9 (09/2018)  

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Interfacial studies of crosslinked urethanes : Part III. Structure-property relationships in polyester waterborne polyurethanes / M. W. Urban in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 71, N° 888 (01/1999)

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Measuring gloss with a reflectometer / Rolf Döring in EUROPEAN COATINGS JOURNAL (ECJ), N° 9/99 (09/1999)  

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Monitoring the degree of curing in coatings using contact angle and surface reflectance measurements / Saminu Musa Magami in SURFACE COATINGS INTERNATIONAL, Vol. 97.5 (10/2014)  

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More than meets the eye / Cornelia Dreyer in EUROPEAN COATINGS JOURNAL (ECJ), N° 12 (12/2013)  

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A multispectral imaging approach to colour measurement and colour matching of single yarns without winding / Lin Luo in COLORATION TECHNOLOGY, Vol. 131, N° 4 (08/2015)  

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Optical analysis of coatings including diffractive pigments using a high-resolution gonioreflectometer / Jiri Filip in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 2 (03/2019)  

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Optimal eigenvectors of spectral datasets : sequential selection from one set vs a collection from two sets / Morteza Maali Amiri in COLORATION TECHNOLOGY, Vol. 132, N° 6 (12/2016)  

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Optimization of sintering temperature in CdZnS films using reflection spectroscopy / Vipin Kumar in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 7, N° 3 (05/2010)  

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