Differences in loading patterns between fast walking and jogging at the same speed in male adults / Ruoyi Li in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 2 (Année 2020)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 2 (Année 2020) . - 7. p. Titre : Differences in loading patterns between fast walking and jogging at the same speed in male adults Type de document : texte imprimé Auteurs : Ruoyi Li, Auteur ; Hao Liu, Auteur ; Mengyuan Guo, Auteur ; Jitka Badurova, Auteur ; Luming Yang, Auteur ; Haojun Fan, Auteur Année de publication : 2020 Article en page(s) : 7. p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Biomécanique Course à pied Hommes Marche Pied Statistique Transfert de charge Index. décimale : 796.51 Marche Résumé : Fast walking and jogging are two common exercises for people to maintain health in daily life. But the differences in loading patterns of fast walking and jogging are still unclear. The purpose of this study was to compare loading patterns in fast walking and jogging at the same speed, and to identify how differences in foot mechanics influence plantar pressure distribution between the two modes of gait. Totally, 49 healthy males participated in this study. Data of pressure parameters, including maximum force (MF), peak pressure (PP), contact area (CA), force-time integral (FTI), were recorded by Pedar-X insole plantar pressure measurement system in participants’ fast walking and jogging process at 7 km/h. A Load transfer analysis method was used to quantify the plantar load transference from fast walking to jogging. The results showed that MF, PP and CA increased in metatarsal regions and midfoot regions while decreased in toes regions and heel during jogging when compared with fast walking. FTI decreased in all foot regions during jogging compared to fast walking. Under the effects of spring mechanics and the varus of rearfoot during jogging, fast walking and jogging reveal different loading patterns. Compared jogging to fast walking, load transferred as follow : 1) in transverse direction, load transferred from lateral foot to medial foot in metatarsal regions and midfoot regions, 2) in longitudinal direction, load transferred from toes to the metatarsal, and from heel to the metatarsal and midfoot. These results also provide suggestions for footwear designs. Note de contenu : - Participants - Speed selects - Procedure - Statistical analysis - Load transfer analysis method - Table 1 Relative FTI (%) in fast walking and jogging at 7 km/h DOI : https://doi.org/10.1186/s42825-020-00021-4 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-020-00021-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37335 [article]

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Research on innovative design methods of intangible cultural heritage in leather products / Han Xu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 3 (03/2024)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIX, N° 3 (03/2024) . - p. 119-131 Titre : Research on innovative design methods of intangible cultural heritage in leather products Type de document : texte imprimé Auteurs : Han Xu, Auteur ; Han Chen, Auteur ; Biyu Peng, Auteur ; Luming Yang, Auteur Année de publication : 2024 Article en page(s) : p. 119-131 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Conception technique Couleur -- Dans l'art Couture Innovations Motifs (arts décoratifs) Patrimoine culturel -- Analyse Patrimoine technique Point de croix Recherche Vêtements en cuir Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Intangible cultural heritage is an important symbol of a nation’s historical and cultural achievements, containing rich connotations and high artistic value. Leather products, as a significant component of modern fashion, have a wide range of market demand. To address the issues of traditional patterns in intangible cultural heritage not matching modern aesthetics and lacking application scenarios, this study takes leather products as carriers and proposes an innovative design paradigm for traditional clothing patterns. We chose the Miao cross-stitch patterns of Guizhou, China, as a case study. Analyzed their subject connotations, common structures and features. Using split grammar and shape grammar, the patterns are deconstructed and reassembled to obtain foundational innovative patterns. The Mean-shift clustering algorithm was applied to extract the classic colors of Miao cross-stitch patterns. Based on fractal theory and computer algorithms, a novel pattern model for Miao cross-stitch was proposed, incorporating representative patterns and colors to complete pattern designs. Finally, the feasibility of the proposed approach was validated through the practical design of leather fashion accessories on the Style 3D platform. This study aims to provide methodological references for the modernization and innovation of intangible cultural heritage, as well as the diverse integration of leather products design. Note de contenu : - RESEARCH BASIS : Patterns motifs - Pattern structure - Pattern color - METHODS : Elemental derivation methods - Mean-shift color clustering algorithm - Fractal pattern design method - Design paradigm - APPLICATION : Derivation of Miao cross-stitch element - Color design of Miao cross-stitch - Miao cross-stitch pattern design - The application of cross-stitch patterns in leather apparel - Table 1 : Classification and extraction of Miao cross-stitch patterns - Table 2 : Classic pattern colors and their RGB values DOI : https://doi.org/10.34314/jalca.v119i3.8265 En ligne : https://drive.google.com/file/d/1Qp_XpW8G8ymFGSO9FvqL3MyAYkiCWUtx/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40618 [article]

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Simulation of realistic fur texture based on piece element synthesis / Wei Wang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 12 (12/2022)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVII, N° 12 (12/2022) . - p. 520-533 Titre : Simulation of realistic fur texture based on piece element synthesis Type de document : texte imprimé Auteurs : Wei Wang, Auteur ; Weijie Wang, Auteur ; Gaopeng Zhang, Auteur ; Luming Yang, Auteur ; Biyu Peng, Auteur Année de publication : 2022 Article en page(s) : p. 520-533 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Fourrures Matériaux -- Texture Simulation par ordinateur Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Realistic fur texture is usually modeled and rendered with three-dimensional software. Due to the complexity and inefficiency of the three-dimensional software, it cannot meet general designers’ requirements to represent realistic fur texture quickly. In order to achieve the rapid drawing of real-quality fur, this work proposes an approach to simulating realistic fur texture based on the method of piece elements synthesis. To be specific, we used fur elements to represent fur units, the dislocation and superposition of which formed the fur visual effect. Also, we discuss the validity and feasibility of parameters that can be matched in Adobe Illustrator software. The method applied in this paper can not only meet the timeliness and convenience of designers when representing fur texture, but also visualize fur texture with a high sense of authenticity and diversity. Note de contenu : - METHOD : Formation of the visual texture of fur - Research hypothesis - Definition of fur texture model - Low-level parameter-circles and triangles - Middle-level parameter-fur element - High-level parameter-fur element arrangement - Construction of fur texture model - Application - RESULTS AND DISCUSSION : The influence of parameter changes on simulation effect - The influence of the star angle points changes on the effect of fur simulation - The influence of the star outer radius length change on the fur simulation effect - The influence of the roughness size change on the effect of fur simulation - The influence of shrinkage value on the effect of fur simulation - The influence of the gradient slider location change on the effect of fur simulation - DISCUSSION : The effectiveness of the method - The adaptability of the method - Comparisons among the methods - Table 1 : Value range of each parameter in fur texture model - Table 2 : Correspondance between fur texture model and parameters in Adobe Illustrator - table 3 : The comparisons among different fur simulation methods DOI : https://doi.org/10.34314/jalca.v117i12.6388 En ligne : https://drive.google.com/file/d/1sGXk2U1-oopyjrRrMzWrWTSBGMTClDJo/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38524 [article]

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Super robust, anti-bacterial polyurethane ionogel with high sensitivity and hydrophobicity / Wei Wang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 1 (01/2024)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIX, N° 1 (01/2024) . - p. 31-40 Titre : Super robust, anti-bacterial polyurethane ionogel with high sensitivity and hydrophobicity Type de document : texte imprimé Auteurs : Wei Wang, Auteur ; Shiyang Yan, Auteur ; Yihong Zhao, Auteur ; Hao Liu, Auteur ; Luming Yang, Auteur ; Biyu Peng, Auteur Année de publication : 2024 Article en page(s) : p. 31-40 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens Capteurs de contraintes Caractérisation Cuirs et peaux -- Conservation gels ioniques Un gel ionique (ou Ionogel ) est un matériau composite constitué d'un liquide ionique immobilisé par une matrice inorganique ou polymère. Le matériau a la qualité de maintenir une conductivité ionique élevée à l'état solide. Pour créer un gel ionique, la matrice solide est mélangée ou synthétisée in situ avec un liquide ionique. Une pratique courante consiste à utiliser un copolymère séquencé qui est polymérisé en solution avec un liquide ionique afin de générer une nanostructure auto-assemblée où les ions sont sélectivement solubles. Les gels ioniques peuvent également être fabriqués à partir de polymères non copolymères tels que la cellulose, d'oxydes tels que le dioxyde de silicium ou de matériaux réfractaires tels que le nitrure de bore. (Wikipedia) Hydrophobie Polyuréthanes Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Ionogel based on ionic liquids plays a vital role in wearable electronic devices. In this study, a robust and anti-bacterial ionogel with high sensitivity and hydrophobicity is synthesized by adding 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide to thermoplastic polyurethanes at a ratio of 1:1. The ionogel not only demonstrates tensile strength of 23.1 MPa and elongation at break of 1008%, but also exhibits excellent fatigue resistance with low residual strain (8%) and small hysteresis loop. Ionic liquid makes the ionogel have high-temperature stability (T5% near 300°C) and low Tg (-63.3°C). Due to the anti-bacterial property of ionic liquid, the ionogel formed by ionic liquid has anti-bacterial property, with up to 99% inhibition against E. coli and S. aureus. The sensor prepared with the ionogel shows a Gauge Factor of 1.8, with a short response time (128 ms) and a stable induction signal under water and at low temperature. Due to those performance characteristics, we believe that the study could provide insights for subsequent research on ionogel-based wearable electronic devices, for instance, the development of electronic skin in the leather industry. Note de contenu : - EXPERIMENTAL : Materials - Preparation of TPU/IL ionogel - Characterization - RESULTS AND DISCUSSIONS : Preparation and structure of the ionogels - Stretchability of the ionogels - Environmental stability of the ionogels - Anti-bacterial property of the ionogels - The ionogels as strain sensor - The ionogel as human skin sensor DOI : https://doi.org/10.34314/jalca.v119i1.8293 En ligne : https://drive.google.com/file/d/16BZB7P5x1_NxWJWcP0QaXhlnZweuMAYb/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40347 [article]

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