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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Effects of bactericide-protease interactions on the protease-assisted soaking performance / Hao Liu in COLLAGEN AND LEATHER, Vol. 5 (2023)  

[article]  inCOLLAGEN AND LEATHER > Vol. 5 (2023) . - 12 p. Titre : Effects of bactericide-protease interactions on the protease-assisted soaking performance Type de document : texte imprimé Auteurs : Hao Liu, Auteur ; Yahang Pan, Auteur ; Bi Shi, Auteur ; Yunhang Zeng, Auteur Année de publication : 2023 Article en page(s) : 12 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antibactériens Cuirs et peaux Peaux brutes -- Trempe Peptidases Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Protease-assisted soaking has received increasing attention in recent years. However, few reports have elaborated on the effect of bactericides, which are used to protect raw hides from microbial damage in the soaking process, on the performance of protease-assisted soaking. Here we investigate the effects of three bactericides, namely, 2-methyl-4-isothiazolin-3-one (MIT), sodium propyl 4-hydroxybenzoate (SPHB) and cetyl trimethyl ammonium bromide (CTAB), on the catalytic activity of protease. MIT and SPHB have little effect on the proteolytic activity, whilst CTAB has a negative effect. Fluorescence spectroscopy, synchronous fluorescence spectroscopy, molecular docking and molecular dynamics simulation were used to analyse the bactericide–protease interaction. The data reveal that MIT and SPHB are bound to the non-catalytic sites of protease, whilst CTAB affects the catalytic triad of protease. Furthermore, the protease and bactericides were used alone, simultaneously and sequentially in the soaking process, and their soaking performances were evaluated. The evaluation shows that the use of protease increases the microorganisms in the soaking float, and MIT exhibits the best bactericidal effect. The simultaneous use of protease and MIT effectively inhibits bacteria and scarcely affects the removal of unstructured proteins from hides and the attack on epidermis by protease. These findings contribute to a better understanding of the scientific use of protease with other auxiliaries in soaking. Note de contenu : - EXPERIMENTAL : Materials - Determination of protease properties in the presence of bactericide - Interaction measurement - Soaking trials and their performance evaluation - RESULTS AND DISCUSSION : Effect of bactericide on protease properties - Interaction between bactericide and protease - Effect of bactericide on the soaking performance of protease - Table 1 : Dosages of protease and bactericide in soaking trials - Table 2 : Total amounts of bacteria, yeasts and moulds in the soaking float En ligne : https://link.springer.com/content/pdf/10.1186/s42825-023-00135-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40075 [article]

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Factors affecting mass transfer of protease in pelt during enzymatic bating process / Ying Song in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 1 (Année 2019)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 1 (Année 2019) . - 10 p. Titre : Factors affecting mass transfer of protease in pelt during enzymatic bating process Type de document : texte imprimé Auteurs : Ying Song, Auteur ; Siqi Wu, Auteur ; Qian Yang, Auteur ; Hao Liu, Auteur ; Yunhang Zeng, Auteur ; Bi Shi, Auteur Année de publication : 2019 Article en page(s) : 10 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Confitage Le confitage est une action biochimique effectuée au moyen de produits enzymatiques, qui a pour but de dégrader les fibres élastiques, contribuant ainsi à augmenter la souplesse du cuir. En outre, les enzymes complètent la dégradation des résidus épidermiques, donnant ainsi une fleur plus propre et plus lisse. Cuirs et peaux Electrostatique Peptidases Poids moléculaires Tension superficielle Transfert de masse Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Bating pelt with protease is an important process, which removes unwanted non-collagenous proteins from the pelt and moderately disperse hide collagen network. However, the grain surface, may be excessively hydrolyzed during bating due to the longer retention time of protease in the grain than in the middle layer caused by the low mass transfer rate of protease in pelt. Here, the effects of protease dosage, common auxiliaries and molecular weight of protease on protease transfer during bating were investigated so that we can find the key points to avoid excessive collagen damage, particularly in the grain. Observably, increasing protease dosage led to faster protease transfer and softer leather, but along with more considerable grain damage. Using penetrating agent JFC (fatty alcohol-polyoxyethylene ether) and ammonium sulfate enhanced protease transfer and simultaneously alleviated collagen damage due to the decrease in interfacial tension and electrostatic attraction between protease and pelt, respectively. Additionally, proteases with lower molecular weight transferred faster in pelt, which suggests that a potential strategy to solve the conflict between the mass transfer and the reaction of protease in pelt might be to produce/employ smaller bating proteases. Note de contenu : - MATERIALS AND METHODS : Materials - Effect of protease dosage on bating performance - Effect of auxiliaries on bating performance of protease - Effect of molecular weight of protease on its transfer rate during bating - RESULTS AND DISCUSSION : The effect of protease dosage on bating performance - The effect of auxiliaries on bating performance - The effect of molecular weight of protease on its mass transfer rate during bating DOI : https://doi.org/10.1186/s42825-019-0007-7 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-019-0007-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36949 [article]

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A parametric distribution model of electrostatic spray rotating bell and application for automobile painting / Peilun Zhang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 5 (09/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 5 (09/2023) . - p. 1727-1745 Titre : A parametric distribution model of electrostatic spray rotating bell and application for automobile painting Type de document : texte imprimé Auteurs : Peilun Zhang, Auteur ; Weiguo Gao, Auteur ; Chen Zhao, Auteur ; Hao Liu, Auteur ; Xuhao Wang, Auteur ; Xiangzhi Meng, Auteur Année de publication : 2023 Article en page(s) : p. 1727-1745 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Automobiles -- Revêtements:Automobiles -- Peinture Cloche rotative Pulvérisation électrostatique Tags : '  Atomiseur  ESRB'  'Pulvérisation  automobile'  'Modèle  de  distribution  d'épaisseur'  'Simulation  d'épaisseur  revêtement'  'Programmation  hors  ligne' Index. décimale : 667.9 Revêtements et enduits Résumé : Compared with spray gun spraying, electrostatic spray rotating bell (ESRB) spraying can provide better film forming quality and higher adhesion rate, which is more suitable for the automobile painting. However, the complexity of the automobile surface geometry and the spray pattern produced by ESRB painting makes the trajectory planning and the determination of spraying parameters challenging. This research presents a coating thickness distribution model for ESRB atomizer with uniform motion and establishes a parametric model to express the functional relationship between the thickness distribution model and atomizer parameters. The proposed parametric model aims to provide a guideline for the determination of spraying parameters in the process of off-line programming in the painting industry. Firstly, a novel feature points fitting distribution model was established based on the characteristics of ESRB uniform linear spraying coating. The model can fully visualize the cumulative profile characteristics of coatings. Secondly, the orthogonal experiment, multilevel and multifactor, was designed to analyze the variation of feature points with the painting parameters. Then, based on the requirements of the spraying process, an objective function is established for the coating thickness and other indicators of each area, and a genetic algorithm is used to solve it, so as to determine the ESRB spraying parameters. Finally, three simulation experiments show that the new model is effective and has high prediction accuracy, which can be effectively applied to the ESRB spraying system. Note de contenu : - ESRB SPAYING THICKNESS DISTRIBUTION MODEL AND PARAMETERIZATION METHOD : Working principle and parameters of ESRB - ESRB uniform linear motion spaying distribution model - Experimental design and data processing - ESRB parametric distribution model - APPLICATION OF PARAMETRIC DISTRIBUTION MODEL IN OFF-LINE PLANNING : Spraying trajectory of raster pattern - Optimization of spraying parameters - EXPERIMENTS AND VERIFICATION : Accuracy verification of predicting spray distribution model - Application of parametric distribution model in off-line programming DOI : https://doi.org/10.1007/s11998-023-00777-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-023-00777-4.pdf?pdf=button% [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39984 [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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