Institute for Color Science and Technology with scientific cooperation of Iran Color SocietyJournal of Color Science and Technology1735-877915420220220Investigation of the Color Stability of BCRA Ceramic Standards using Univariate Statistical MethodsInvestigation of the Color Stability of BCRA Ceramic Standards using Univariate Statistical Methods24325481768FANajmehKhaliliDepartment of Color Physics, Institute for Color Science and Technology, P.O. Box: 16765-654, Tehran, Iran.MahdiSafiDepartment of Color Physics, Institute for Color Science and Technology, P.O. Box: 16765-654, Tehran, Iran.0000-0002-0200-3542FarhadAmeriDepartment of Color Physics, Institute for Color Science and Technology, P.O. Box: 16765-654, Tehran, Iran.Journal Article20201109It is essential to investigate calibrated BCRA ceramic standards reference' color stability to determine the reflectance spectrophotometer's calibration period time. In this research, the color and spectral changes of a set of fourteen BCRA ceramic standards made by Avian Technologies Company were investigated over three years under repeatable conditions. Each ceramic's color changes were evaluated by calculating ∆E*ab and ∆E*00 and then analyzed using univariate statistic metrics such as MCDM and RMS (2S). Similarly, the spectral reflectance factor's variation was evaluated using univariate metrics of the standard deviation of reflectance (∆Rλ,2δ) and RMSR. This study's statistical results showed that the color and spectral reflectance factor of BCRA ceramic standards had no significant changes for three years and established good color stability. The maximum values were obtained for the statistic metric of MCDM (ΔE*ab) within about 0.08 units and the statistic metric of RMSR within about 0.02%. This result can play a significant role in reducing the recalibration costs of these reference ceramics.It is essential to investigate calibrated BCRA ceramic standards reference' color stability to determine the reflectance spectrophotometer's calibration period time. In this research, the color and spectral changes of a set of fourteen BCRA ceramic standards made by Avian Technologies Company were investigated over three years under repeatable conditions. Each ceramic's color changes were evaluated by calculating ∆E*ab and ∆E*00 and then analyzed using univariate statistic metrics such as MCDM and RMS (2S). Similarly, the spectral reflectance factor's variation was evaluated using univariate metrics of the standard deviation of reflectance (∆Rλ,2δ) and RMSR. This study's statistical results showed that the color and spectral reflectance factor of BCRA ceramic standards had no significant changes for three years and established good color stability. The maximum values were obtained for the statistic metric of MCDM (ΔE*ab) within about 0.08 units and the statistic metric of RMSR within about 0.02%. This result can play a significant role in reducing the recalibration costs of these reference ceramics.https://jcst.icrc.ac.ir/article_81768_31a6fb07491584c4340922b0ef58c340.pdfInstitute for Color Science and Technology with scientific cooperation of Iran Color SocietyJournal of Color Science and Technology1735-877915420220220Using camera of a cell phone as a spectrophotometer in the outdoor usageUsing camera of a cell phone as a spectrophotometer in the outdoor usage25526981769FAAlirezaVaziriDepartment of Textile Engineering, Isfahan University of Technology, Isfahan 8415683111, IranFiroozGhnabariDepartment of Chemistry Engineering, University of Tehran, Tehran 141556619, IranMahzyarGorji BandpayJonbesh Hamgam Tolid and Peiman Pars Company, MSTP, Sari 4816845155, IranJournal Article20210110To use a mobile phone camera as a spectrophotometer, two steps are usually required. In the first step, the output RGB values of a camera are converted to device-independent color values. Afterward, spectral reflection values are reproduced from those device-independent values. In this paper, the matrix method was used to convert two color spaces to each other in the first step. In the next step, spectral reflection values were reproduced using the principal component analysis (PCA) method. It was shown that the best result is obtained using light source D50/ standard observer in 1964 and light source A/ standard observer in 1931 in a way that the color of the second light source and observer are obtained through a conversion matrix from the color values of the first light source and observer.To use a mobile phone camera as a spectrophotometer, two steps are usually required. In the first step, the output RGB values of a camera are converted to device-independent color values. Afterward, spectral reflection values are reproduced from those device-independent values. In this paper, the matrix method was used to convert two color spaces to each other in the first step. In the next step, spectral reflection values were reproduced using the principal component analysis (PCA) method. It was shown that the best result is obtained using light source D50/ standard observer in 1964 and light source A/ standard observer in 1931 in a way that the color of the second light source and observer are obtained through a conversion matrix from the color values of the first light source and observer.https://jcst.icrc.ac.ir/article_81769_afd47e903a98fd0f8e1d1d77d22799c9.pdfInstitute for Color Science and Technology with scientific cooperation of Iran Color SocietyJournal of Color Science and Technology1735-877915420220220Preparation of Bio-Sensor with Hybrid Nanofibers of Chitosan/ Functional Carbon Nanotubes for the Sensing of NicotinePreparation of Bio-Sensor with Hybrid Nanofibers of Chitosan/ Functional Carbon Nanotubes for the Sensing of Nicotine27128681770FAAbolfazlMiraniDepartment of Biomedical Engineering, South Tehran Branch, Islamic Azad University, P.O. Box: 1955764955:1,2,3, Tehran, IranLalehMalekniaDepartment of Biomedical Engineering, South Tehran Branch, Islamic Azad University, P.O. Box: 1955764955:1,2,3, Tehran, IranAmirAmirabadiDepartment of Biomedical Engineering, South Tehran Branch, Islamic Azad University, Tehran IranJournal Article20201130In this paper, Nicotine (NIC) was detected by cyclic voltammetry (CV) using a modified glassy carbon electrode (GC). To do this, the surface of the GC electrode was modified by hybrid Nanofiber obtained from electrospinning method. Hybrid nanofibers were produced through the dispersion of carboxylated Multi-walled carbon nanotube (MWCNT-COOH) as an inorganic component in the CS polymer matrix as an organic component. The nanofibers showed unique morpHology and high surface area value. With the increase of functionalized carbon nanotube content in the nanofibers, the mean pore diameter and the average nanofiber diameter increased. The electrochemical properties of nanofibers toward the sensing of NIC were investigated by cyclic voltammetry method. NIC was irreversibly reduced with the use of CS/MWCNT-COOH electrode, a controlled process with 2 protons and 2 electrons. An oxidation signal at lower potential with higher current was obtained for nicotine with the use of polymer-modified electrode compared to glassy carbon electrode.In this paper, Nicotine (NIC) was detected by cyclic voltammetry (CV) using a modified glassy carbon electrode (GC). To do this, the surface of the GC electrode was modified by hybrid Nanofiber obtained from electrospinning method. Hybrid nanofibers were produced through the dispersion of carboxylated Multi-walled carbon nanotube (MWCNT-COOH) as an inorganic component in the CS polymer matrix as an organic component. The nanofibers showed unique morpHology and high surface area value. With the increase of functionalized carbon nanotube content in the nanofibers, the mean pore diameter and the average nanofiber diameter increased. The electrochemical properties of nanofibers toward the sensing of NIC were investigated by cyclic voltammetry method. NIC was irreversibly reduced with the use of CS/MWCNT-COOH electrode, a controlled process with 2 protons and 2 electrons. An oxidation signal at lower potential with higher current was obtained for nicotine with the use of polymer-modified electrode compared to glassy carbon electrode.https://jcst.icrc.ac.ir/article_81770_23d823f4f27e6956044eae0ef3cf5682.pdfInstitute for Color Science and Technology with scientific cooperation of Iran Color SocietyJournal of Color Science and Technology1735-877915420220220Identification of red, blue and golden pigments in Qajar Mural Painting anaclitic fire place in Goharion House in TabrizIdentification of red, blue and golden pigments in Qajar Mural Painting anaclitic fire place in Goharion House in Tabriz28729981771FAAlirezaKoochakzaeiFaculty of cultural materials conservation, Tabriz Islamic Art University, Tabriz, IranYaserHamzaviAssistant Professor, Faculty of Applied Arts, Tabriz Islamic Art University, Tabriz, Iran.FaezehShojae FarFaculty of cultural materials conservation, Tabriz Islamic Art UniversityJournal Article20201211The aim of this this study is to identify the pigments of mural painting remains on a historical fireplace related to the Qajar era in Goharion house, Tabriz. After sampling the blue, red and golden pigments of different parts of the mural, SEM-EDS to identifying the elements in the samples structure, micro Raman and FTIR spectroscopy, for investigation of structural properties, and PLM, for investigation of the optical properties of the samples in both PPL and XPL, were used. The results showed that a mixture of red lead, orpiment and white lead was used to paint flowers with red tones. There are also spots of red lead on the edge of the mural. The blue pigment was ultramarine (synthetic) and a combination of this pigment and gypsum was used in sky blue. The golden color analysis showed the use of gold and copper alloy in the form of sheets. This color is in the inscription part along with the formation of copper degradation products, in the form of carboxylateThe aim of this this study is to identify the pigments of mural painting remains on a historical fireplace related to the Qajar era in Goharion house, Tabriz. After sampling the blue, red and golden pigments of different parts of the mural, SEM-EDS to identifying the elements in the samples structure, micro Raman and FTIR spectroscopy, for investigation of structural properties, and PLM, for investigation of the optical properties of the samples in both PPL and XPL, were used. The results showed that a mixture of red lead, orpiment and white lead was used to paint flowers with red tones. There are also spots of red lead on the edge of the mural. The blue pigment was ultramarine (synthetic) and a combination of this pigment and gypsum was used in sky blue. The golden color analysis showed the use of gold and copper alloy in the form of sheets. This color is in the inscription part along with the formation of copper degradation products, in the form of carboxylatehttps://jcst.icrc.ac.ir/article_81771_09f014fedbb24b899a04ab230847810d.pdfInstitute for Color Science and Technology with scientific cooperation of Iran Color SocietyJournal of Color Science and Technology1735-877915420220220Removal and measurement of bromocresol purple dye in aqueous samples by β-cyclodextrin-modified magnetic carbon nanotube with dispersive solid-phase extraction techniqueRemoval and measurement of bromocresol purple dye in aqueous samples by β-cyclodextrin-modified magnetic carbon nanotube with dispersive solid-phase extraction technique30131581773FAAliMoghimiDepartment of Chemistry, Varamin-Pishva Branch, Islamic Azad University, Varamin, IranMiladAbnikiDepartment of Chemistry, Varamin-Pishva Branch, Islamic Azad University, Varamin, IranJournal Article20201218This study investigated the pre-concentration, determination and removal of small amounts of colored effluents from bromocresol purple dye in various aqueous samples. In this research, a new method of solid phase extraction in aqueous samples has been performed by magnetic carbon nanotubes modified with β-cyclodextrin. The proposed method is cheap, easy and fast and is compatible with many existing device methods. Parameters of extraction of bromocresol purple from an aqueous sample including the effect of organic and desorbent solvent, optimum pH (pH = 9), extraction time, stirring speed, volume of phase giver were studied. The mentioned technique has many advantages such as; It has a short extraction time, low consumption of organic solvents, elimination of the effect of previous tests, low detection limit and high concentration factor. Concentration factor of 14.3 and detection limit for bromocresol purple dye was 4.8 μg / L, respectively. The linear range of method between 0.1-20 mg / L and the relative standard deviation for bromocresol purple was 4.65%.This study investigated the pre-concentration, determination and removal of small amounts of colored effluents from bromocresol purple dye in various aqueous samples. In this research, a new method of solid phase extraction in aqueous samples has been performed by magnetic carbon nanotubes modified with β-cyclodextrin. The proposed method is cheap, easy and fast and is compatible with many existing device methods. Parameters of extraction of bromocresol purple from an aqueous sample including the effect of organic and desorbent solvent, optimum pH (pH = 9), extraction time, stirring speed, volume of phase giver were studied. The mentioned technique has many advantages such as; It has a short extraction time, low consumption of organic solvents, elimination of the effect of previous tests, low detection limit and high concentration factor. Concentration factor of 14.3 and detection limit for bromocresol purple dye was 4.8 μg / L, respectively. The linear range of method between 0.1-20 mg / L and the relative standard deviation for bromocresol purple was 4.65%.https://jcst.icrc.ac.ir/article_81773_a5e4caab070af37a4e330ee142ae43d9.pdfInstitute for Color Science and Technology with scientific cooperation of Iran Color SocietyJournal of Color Science and Technology1735-877915420220220The Use of Support Vector Machine in The Classification of Lachack Toranj and Torkaman Geometric Rug DesignsThe Use of Support Vector Machine in The Classification of Lachack Toranj and Torkaman Geometric Rug Designs31732781780FATayebeSoleymanian MoghadamTextile Engineering Department, Amirkabir University of TechnologyMansourehGhanbar AfjehTextile Engineering Department, Amirkabir University of TechnologyS.H.AmirshahiTextile Engineering Department, Amirkabir University of TechnologyJournal Article20210301Design is one of the most critical aspects of evaluating Persian rugs. While Persian rugs are woven in different designs, their unique patterns distinguish them from other rug styles such as Turkish, Indian and Chinese. In this study, the classification of two categories of Persian rugs (Lachak Toranj and Torkaman Geometric) was followed using Support Vector Machine (SVM) and based on Fourier feature. In this regard, the grayscale images of 60 rugs with different designs were collected. Using the Fourier transform, the unique feature of these two rugs’ categories were extracted and used for classification. For this purpose, a two-class support vector machine was used. According to the results, the SVM classification method can classify these two categories of rugs with an accuracy of 89% by using the polar Fourier feature.Design is one of the most critical aspects of evaluating Persian rugs. While Persian rugs are woven in different designs, their unique patterns distinguish them from other rug styles such as Turkish, Indian and Chinese. In this study, the classification of two categories of Persian rugs (Lachak Toranj and Torkaman Geometric) was followed using Support Vector Machine (SVM) and based on Fourier feature. In this regard, the grayscale images of 60 rugs with different designs were collected. Using the Fourier transform, the unique feature of these two rugs’ categories were extracted and used for classification. For this purpose, a two-class support vector machine was used. According to the results, the SVM classification method can classify these two categories of rugs with an accuracy of 89% by using the polar Fourier feature.https://jcst.icrc.ac.ir/article_81780_4a6033f08dd03ec8a170bbb2c0df88ac.pdfInstitute for Color Science and Technology with scientific cooperation of Iran Color SocietyJournal of Color Science and Technology1735-877915420220220Synthesis, spectroscopic evaluation and density functional theory calculations of some new azo dyes based on 5-chloro-8-hydroxyquinolineSynthesis, spectroscopic evaluation and density functional theory calculations of some new azo dyes based on 5-chloro-8-hydroxyquinoline32934281781FAF.Ashouri MirsadeghiDepartment of Chemistry, Faculty of Science, Lahijan Branch, Islamic Azad University, Lahijan, IranE.O.Moradi RufchahiDepartment of chemistry, Faculty of Sciences, Islamic azad University, Lahijan Branch, Lahijan, IranS.ZarrabiDepartment of Chemistry, Faculty of Science, Lahijan Branch, Islamic Azad University, Lahijan, IranJournal Article20201211In this study, two 2-aminobenzothiazole derivatives were prepared by the reaction of appropriate substituted anilines with potassium thiocyanate in acetic acid followed by mild cyclization oxidation reaction with bromine at room temperature. Then, 2-aminobenzothiazole and each of the two synthesized amines were diazotized with nitorsyl sulfuric acid and coupled with 5-chloro-8-hydroxy quinoline to prepare corresponding heteroarylazo dyes. Their solvatochromism was evaluated in different solvents. The effects of acid and base on the absorption maximum wavelengths of the compounds were also studied. From the optical spectra, in each case, the isosbestic points indicate that the two species are in equilibrium. For all of the compounds under investigation, the dependence of the absorbance on the pH value gives sigmoid curves. The acidity constants (pKa) of the dyes were also determined using the spectrophotometric method in an ethanol-water mixture (80:20, v/v) at 20-23°C. Besides, density functional theory (DFT) calculations were carried out in order to compare the energies of proposed azo and hydrazone tautomers of the dyes.In this study, two 2-aminobenzothiazole derivatives were prepared by the reaction of appropriate substituted anilines with potassium thiocyanate in acetic acid followed by mild cyclization oxidation reaction with bromine at room temperature. Then, 2-aminobenzothiazole and each of the two synthesized amines were diazotized with nitorsyl sulfuric acid and coupled with 5-chloro-8-hydroxy quinoline to prepare corresponding heteroarylazo dyes. Their solvatochromism was evaluated in different solvents. The effects of acid and base on the absorption maximum wavelengths of the compounds were also studied. From the optical spectra, in each case, the isosbestic points indicate that the two species are in equilibrium. For all of the compounds under investigation, the dependence of the absorbance on the pH value gives sigmoid curves. The acidity constants (pKa) of the dyes were also determined using the spectrophotometric method in an ethanol-water mixture (80:20, v/v) at 20-23°C. Besides, density functional theory (DFT) calculations were carried out in order to compare the energies of proposed azo and hydrazone tautomers of the dyes.https://jcst.icrc.ac.ir/article_81781_862916702c7edec02f45e424e94a04f2.pdf