Colour-patterned fabric-defect detection using unsupervised and memorial defect-free features / Hongwei Zhang in COLORATION TECHNOLOGY, Vol. 138, N° 6 (12/2022)  

[article]  inCOLORATION TECHNOLOGY > Vol. 138, N° 6 (12/2022) . - p. 602-620 Titre : Colour-patterned fabric-defect detection using unsupervised and memorial defect-free features Type de document : texte imprimé Auteurs : Hongwei Zhang, Auteur ; Weiwei Zhang, Auteur ; Yang Wang, Auteur ; Shuai Lu, Auteur ; Le Yao, Auteur ; Xia Chen, Auteur Année de publication : 2022 Article en page(s) : p. 602-620 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Automatisation Détection de défauts (Ingénierie) Teinture -- Fibres textiles Textiles et tissus -- Défauts Textiles et tissus imprimés Index. décimale : 667.3 Teinture et impression des tissus Résumé : Automatic colour-patterned fabric-defect detection is essential and challenging in controlling manufacturing quality. Because of the scarcity of defective colour-patterned fabric samples and the imbalance of defect types, an auto-encoder trained with defect-free samples is used. However, the auto-encoder sometimes has weak generalisation ability, leading to mis- or over-detection of defects. An unsupervised and memorising defect-free method is proposed for colour-patterned fabric defects. The method designs a memory-guided quantisation variational auto-encoder-2 model and improves the residual post-processing operation. Specifically, it has three significant characteristics. First, it avoids time-consuming and laborious manually labelled samples and only needs defect-free samples in the training phase. Second, we expect the reconstruction image to be a defect-free image. Thus, memory modules are introduced to encourage the model to memorise the features of defect-free samples, which help to remove the image defect areas at the testing stage. Third, to further improve the detection accuracy, the closing operation is used to deal with the residual image that is calculated between the tested and the corresponding reconstructed image. Extensive experiments on various representative fabric samples demonstrated the effectiveness and superiority of the proposed method. Note de contenu : - RELATED WORK : Fabric-defect detection - Memory networks - METHOD: Network structure - Model training - Model testing - EXPERIMENTAL RESULTS AND ANALYSIS : Experimental platform - Experimental dataset - Evaluation indexes - Implementation details - Qualitative and quantitative analysis - Table 1 : The numbers of defective and non-defective samples in the YDFID-1 dataset - Table 2 : Comparison of detection performance of different threshold parameters and different mathematical morphology processing methods - Table 3 : PSNR and SSIM values of reconstruction results of seven models - Table 4 : Quantitative analysis and comparison of test results of seven models under four evaluation indexes DOI : https://doi.org/10.1111/cote.12624 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12624 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38375 [article]

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Molecular design of soluble poly(amide-imide) with high char yield for flame retardant epoxy resin / Yanbin Wang in INTERNATIONAL POLYMER PROCESSING, Vol. 38, N° 4 (2023)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 38, N° 4 (2023) . - p. 518-527 Titre : Molecular design of soluble poly(amide-imide) with high char yield for flame retardant epoxy resin Type de document : texte imprimé Auteurs : Yanbin Wang, Auteur ; Weiwei Zhang, Auteur ; Changlong Zhuang, Auteur ; Shengang Xu, Auteur Année de publication : 2023 Article en page(s) : p. 518-527 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Carbonisation Combustion Epoxydes Polyamide-imide Polymères -- Propriétés mécaniques Polymères -- Propriétés optiques Polymères -- Propriétés thermiques Polymères -- Solubilité Polymères -- Synthèse Polymères ignifuges Rendement en charbon Index. décimale : 668.4 Plastiques, vinyles Résumé : In this study, a noncoplanar diimide diacid monomer (DIDA) was synthesized by direct condensation of trimellitic anhydride (TMA) with m-tolidine. The noncoplanar unit was incorporated into poly(amide-imide)s (PAIs) main chain by Yamazaki-Higashi phosphorylation of DIDA with various aromatic diamines. Encouragingly, all of the PAIs show good solubility in some common solvents such as N,N-Dimethylacetamide (DMAc), N-methyl-2-pyrrolidinone (NMP), and m-cresol. In addition, the soluble PAIs show good optical transmittances of beyond 85 % at 500 nm due to the decreased crystallization ability. On the other hand, PAIs possess good mechanical properties with tensile strengths of 72–90 MPa and tensile moduli beyond 2 GPa. Meanwhile, the designed PAIs also exhibit excellent thermal properties: their glass transition temperatures (Tg) range from 278 to 314 °C, initial decomposition temperatures (5 % weight loss temperatures, T5wt%) are beyond 470 °C, coefficients of thermal expansion (CTE) are below 10 ppm/°C. The excellent mechanical and thermal properties are due to the strengthened hydrogen bonding interaction among the amide groups. Therefore, it is believed that incorporating noncoplanar unit and amide group into the polymer main chain at the same time can simultaneously improve processability, optical transparency, mechanical and thermal properties. Furthermore, it is worth noting that the char of PAI at 800 °C is as high as 72.5 %, which is one of the highest known values. When PAI was incorporated into epoxy resin, the blend passed UL94 V-0 rating due to the high charring capability of PAI. Note de contenu : - EXPERIMENTAL : Materials - Synthesis - Fabrication of epoxy resin and flame retardant blends - Measurements - RESULTS AND DISCUSSION : Molecular design and synthesis of PAIs - Solubility - Optical properties - Mechanical properties - Thermal properties - Flame retardant for epoxy resin - Table 1 : Solubility of PAIs - Table 2 : The optical data of PAI film - Table 3 : The mechanical parameters of PAI-1 and PAI-2 films - Table 4 : Thermal data of PAI films - Table 5 : The thermal data of PAI film DOI : https://doi.org/10.1515/ipp-2023-4381 En ligne : https://drive.google.com/file/d/1Wi87RtgaP-ii_k851FQT14_hwAZI85vl/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40113 [article]

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Photogenerated cathodic protection and invalidation of silane/TiO2 hybrid coatings / Weiwei Zhang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 2 (03/2017)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 14, N° 2 (03/2017) . - p. 417-424 Titre : Photogenerated cathodic protection and invalidation of silane/TiO2 hybrid coatings Type de document : texte imprimé Auteurs : Weiwei Zhang, Auteur ; Hanlin Guo, Auteur ; Haiqing Sun, Auteur ; Rong-Chang Zeng, Auteur Année de publication : 2017 Article en page(s) : p. 417-424 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier inoxydable Analyse électrochimique Anticorrosifs Anticorrosion Corrosion Dioxyde de titane Essais accélérés (technologie) Matériaux hybrides Métaux -- Revêtements protecteurs Protection cathodique Silanes Index. décimale : 667.9 Revêtements et enduits Résumé : Silane/TiO2 hybrid coatings were prepared on 304 stainless steel (304 SS) by a simple dipping method, where the silane is d-γ-methylacryloxy propyl trimethoxyl silane (CH2=C(CH3)COO(CH2)3Si(OCH3)3, MPMS). The photogenerated cathodic protection and invalidation of the hybrid coatings were evaluated by microstructure and electrochemical characterization. The coupling agent MPMS reduced the agglomeration of the nanosized TiO2 powders and promoted the adhesion of the coatings. Barrier protection of the coupled metal was promoted for the hybrid coatings in a short corrosion time. However, MPMS decreased the carrier concentration of the TiO2 electrode due to the large interface resistance. As a result, the corrosion potential shifted positively and the photogenerated cathodic protection decreased. In long-time corrosion, the hybrid coatings became invalid because of the accumulation of electropositive holes that may weaken the Ti–O bond and destroy the barrier effect. Note de contenu : - EXPERIMENTAL MATERIALS AND METHODS : Preparation of TiO2 powders - Preparation of silane/TiO2 hybrid coatings - Characterization - Measurements of photoelectrochemical performance - RESULTS AND DISCUSSION : Composition and microstructure of coatings - Analysis of electrochemical measurement - Corrosion test results DOI : 10.1007/s11998-016-9859-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9859-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28156 [article]

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