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Aldehyde-functionalised distyrylbenzene : Photophysical properties and primary amine sensitivity evaluation in solution and solid state / Fateme Sadat Miri in COLORATION TECHNOLOGY, Vol. 138, N° 6 (12/2022)
[article]
Titre : Aldehyde-functionalised distyrylbenzene : Photophysical properties and primary amine sensitivity evaluation in solution and solid state Type de document : texte imprimé Auteurs : Fateme Sadat Miri, Auteur ; Saeideh Gorji Kandi, Auteur ; Farhad Panahi, Auteur Année de publication : 2022 Article en page(s) : p. 674-683 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alcool polyvinylique
AldéhydesUn aldéhyde est un composé organique, faisant partie de la famille des composés carbonylés, dont l'un des atomes de carbone primaire (relié au plus à 1 atome de carbone) de la chaîne carbonée porte un groupement carbonyle.
L'aldéhyde le plus simple est le formaldéhyde (ou méthanal), aussi appelé formol lorsqu'il est en solution aqueuse.
Un aldéhyde dérive formellement d'un alcool primaire (oxydation) dont le groupement hydroxyde -OH est en bout de chaîne et se forme suite à l'enlèvement de deux atomes H d'où le nom "alcool déshydrogéné" ou aldéhyde.
AminesUne amine est un composé organique dérivé de l'ammoniac dont certains hydrogènes ont été remplacés par un groupement carboné. Si l'un des carbones liés à l'atome d'azote fait partie d'un groupement carbonyle, la molécule appartient à la famille des amides. Découvertes en 1849, par Wurtz les amines furent initialement appelées alcaloïdes artificiels.
On parle d'amine primaire, secondaire ou tertiaire selon que l'on a un, deux ou trois hydrogènes substitués.
Par exemple, la triméthylamine est une amine tertiaire, de formule N(CH3)3.
Typiquement, les amines sont obtenues par alkylation d'amines de rang inférieur. En alkylant l'ammoniac, on obtient des amines primaires, qui peuvent être alkylées en amines secondaires puis amines tertiaires. L'alkylation de ces dernières permet d'obtenir des sels d'ammonium quaternaire.
D'autre méthodes existent : 1. Les amines primaires peuvent être obtenues par réduction d'un groupement azoture, 2. Les amines peuvent aussi être obtenues par la réduction d'un amide, à l'aide d'un hydrure, 3. L'amination réductrice permet l'obtention d'amines substituées à partir de composés carbonylés (aldéhydes ou cétones), 4. Les amines primaires peuvent être obtenues par la réaction de Gabriel.
Photophysique
Polyméthacrylate de méthyleLe poly(méthacrylate de méthyle) (souvent abrégé en PMMA, de l'anglais Poly(methyl methacrylate)) est un polymère thermoplastique transparent obtenu par polyaddition dont le monomère est le méthacrylate de méthyle (MMA). Ce polymère est plus connu sous son premier nom commercial de Plexiglas (nom déposé), même si le leader global du PMMA est Altuglas International9 du groupe Arkema, sous le nom commercial Altuglas. Il est également vendu sous les noms commerciaux Lucite, Crystalite, Perspex ou Nudec.
Produits chimiques -- Détection
solvantsIndex. décimale : 667.3 Teinture et impression des tissus Résumé : The identification of amines is a highly beneficial process in the industrial sector; food corruption, including fish and shellfish and, more importantly, breathing amines, causes dangerous illnesses. In this study, the optical properties and amine sensing of a π-conjugated organic compound, 1,4-bis[4-formylstyryl]benzene (BFSB), containing two aldehyde functional groups, was investigated. BFSB showed ultraviolet–visible absorption in the range of 318-329 nm with a high molar extinction coefficient (ε = 2.21*105–2.83*105 M−1 cm−1) in the tested solvent with different polarities. BFSB emits in the visible spectrum (420-514 nm) with Stokes shifts of ca. 6678-11 991 cm−1. Density functional theory at the B3LYP/6–31 ++ G level of calculation was employed to evaluate the molar structures and frontier orbitals. The combination of BFSB with poly(methyl methacrylate) and polyvinyl alcohol polymers exhibits different photophysical properties. Interaction of this dye with various primary amines in both solution and solid forms leads to the quick formation of an imine group (the reaction of aldehyde with amine and then dehydration). A hypsochromic shift was observed upon treatment of amine with BFSB. Note de contenu : - METHODS : Materials - Instruments - Solution preparation - Thin film preparation - Theory and calculations
- RESULTS AND DISCUSSION : Solvent effect - Polymer effect - Amine sensingDOI : https://doi.org/10.1111/cote.12628 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12628 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38380
in COLORATION TECHNOLOGY > Vol. 138, N° 6 (12/2022) . - p. 674-683[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23716 - Périodique Bibliothèque principale Documentaires Disponible Colour dependency of textile samples on the surface texture / Saeideh Gorji Kandi in COLORATION TECHNOLOGY, Vol. 124, N° 6 (2008)
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Titre : Colour dependency of textile samples on the surface texture Type de document : texte imprimé Auteurs : Saeideh Gorji Kandi, Auteur ; Mohammad Rahmati, Auteur ; Mohammad Amani Tehran, Auteur Année de publication : 2009 Article en page(s) : p.348-354 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.3 Teinture et impression des tissus Résumé : In this paper, the perceptual and instrumental effects of texture on colour is investigated, using 63 textile samples, in nine colour centres and seven texture structures. The effectiveness of texture is evaluated by assessing colour differences between six texture samples and a standard texture in each colour group. Experimental results show that the sample texture has a significant effect on the measured and perceived colour and its influence depends on the colour centre of the sample. The magnitude of texture effect is more dependent on the texture type than on its coarseness. A new term to evaluate texture difference of a pair of textile samples was defined using a Gabor filter (Gabor texture difference). The visual colour changes gave a good correlation with Gabor texture difference values; however, the colour of the samples affected this correlation. So the colour change, as a result of texture differences, depends on two independent variables consisting of the Gabor texture difference and the colour centre of samples. DOI : 10.1111/j.1478-4408.2008.00162.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2008.00162.x/pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3243
in COLORATION TECHNOLOGY > Vol. 124, N° 6 (2008) . - p.348-354[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 010992 - Périodique Bibliothèque principale Documentaires Disponible Introducing new methods based on the standard ISO/IEC 24790 to evaluate graininess for coloured printed images / Bita Panahi in COLORATION TECHNOLOGY, Vol. 138, N° 1 (02/2022)
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Titre : Introducing new methods based on the standard ISO/IEC 24790 to evaluate graininess for coloured printed images Type de document : texte imprimé Auteurs : Bita Panahi, Auteur ; Saeideh Gorji Kandi, Auteur Année de publication : 2022 Article en page(s) : p. 47-57 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Brillance (optique)
Granulation
Impression en couleur
Papier
Papier -- TextureIndex. décimale : 620.197 Matériaux fibreux d'origine végétale et animale : textiles, papier Résumé : Printing quality control has been one of the challenges in the printing industry. Therefore, it is indispensable to find evaluation methods with high correlations with the human visual system to assess the quality of the printed images. Standard ISO/IEC 24790 is one of the recommended standards to achieve this goal. An evaluation procedure for graininess, a common defect in printing, has been presented in this standard; however, this procedure is suggested only for monochrome printed images. Hence, in this research, the graininess of coloured samples is evaluated based on the proposed method in this standard with considering the effect of the paper. For this purpose, fictitious graininess defects are designed and applied on coloured samples and are printed on different papers. A visual assessment is performed to examine the effect of colour and paper differences on graininess. Six different methods, including the method suggested in the standard and the proposed modified procedures, are used to evaluate graininess, and their results are compared to subjective results. Moreover, three other wavelets are studied besides the suggested one in the standard. To eliminate the effect of paper texture, a Gaussian filter is utilised. The results show that applying the Gaussian filter to images increases the correlation between computational procedure results and visual assessment results. Also, the results indicate that utilising haar wavelet slightly increases the correlation. The results demonstrate that besides assessing graininess in greyscale mode, evaluating graininess in RGB (red, green, blue) colour space results in a high correlation with the visual assessment results. Note de contenu : - EXPERIMENTAL : Characteristics of paper - Spectral data - Gloss - Texture - Sample preparation - Visual assessment - Graininess calculations
- RESULTS AND DISCUSSION : Visual comparison results - Graininess calculations - Evaluation of graininess with paper texture removal - Effect of different wavelets on graininess evaluation
- Table 1 : The CIELab values of used papers
- Table 2 : The gloss values of used papers
- Table 3 : The correlation between visual comparison results and graininess evaluation results by using different procedures
- Table 4 : The correlation between visual comparison results and graininess evaluation results by using different procedures and applying Gaussian filter
- Table 5 : The correlation between visual assessment results and graininess evaluation results by using different wavelets and applying Gaussian filterDOI : https://doi.org/10.1111/cote.12570 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12570 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37498
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Code-barres Cote Support Localisation Section Disponibilité 23517 - Périodique Bibliothèque principale Documentaires Disponible Spectral dependence of colorimetric characterisation of scanners / Hossein Fashandi in COLORATION TECHNOLOGY, Vol. 127, N° 4 (2011)
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Titre : Spectral dependence of colorimetric characterisation of scanners Type de document : texte imprimé Auteurs : Hossein Fashandi, Auteur ; Seyed Hossein Amirshahi, Auteur ; Mohammad Amani Tehran, Auteur ; Saeideh Gorji Kandi, Auteur Année de publication : 2011 Article en page(s) : p. 240-245 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorimétrie Tags : 'Caractérisation colorimétrique' 'Module balayage' 'Propriétés spectrales' Index. décimale : 667.3 Teinture et impression des tissus Résumé : The spectral dependence of the colorimetric characterisation of a typical scanner was investigated. Different colour sets, including ColorChecker SG, Kodak Q-60 colour input target, a set of plain woven coloured fabrics with a large colour gamut, and randomly selected samples of the Munsell Book of Color were used as training and testing sets in the colorimetric characterisation of a scanner by employing a non-linear regression method. The coefficient matrices were optimised for each particular media in the training stage and used to predict the device-independent colorimetric data, i.e. CIELab values of other media from their corresponding RGB values measured by the scanner. In order to extract the differences between the applied sets and determine the actual dimensions of their reflectance spectra, the principal component analysis technique was employed. As expected, it was observed that the different sets benefit from diverse dimensional properties and, in some cases, the spectral behaviours of the first few eigenvectors were apparently different. It was demonstrated that scanner colorimetric characterisation depended on the spectral properties of the applied colour set in the training stage and, consequently, the testing errors increased with increasing the spectral dissimilarity between the sets that were used in training and testing sequences. It was concluded that, to achieve better colour reproduction results, the scanner should be characterised for each media with specific spectral properties. Note de contenu : - Sample sets
- Spectrophotometric measurements
- Scanner characterisationDOI : 10.1111/j.1478-4408.2011.00305.x Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11904
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Code-barres Cote Support Localisation Section Disponibilité 013185 - Périodique Bibliothèque principale Documentaires Disponible