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Drag resistance of ship hulls : effects of surface roughness of newly applied fouling control coatings, coating water absorption, and welding seams / Xueting Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 4 (07/2018)
[article]
Titre : Drag resistance of ship hulls : effects of surface roughness of newly applied fouling control coatings, coating water absorption, and welding seams Type de document : texte imprimé Auteurs : Xueting Wang, Auteur ; Stefan Møller Olsen, Auteur ; Eduardo Andres Martinez, Auteur ; Kenneth Nørager Olsen, Auteur ; Søren Kiil, Auteur Année de publication : 2018 Article en page(s) : p. 654-669 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Humidité -- Absorption:Eau -- Absorption
Résistance au glissement
Revêtements antisalissures:Peinture antisalissures
SouduresIndex. décimale : 667.9 Revêtements et enduits Résumé : Fouling control coatings (FCCs) and irregularities (e.g., welding seams) on ship hull surfaces have significant effects on the overall drag performance of ships. In this work, skin frictions of four newly applied FCCs were compared using a pilot-scale rotary setup. Particular attention was given to the effects of coating water absorption on skin friction. Furthermore, to investigate the effects of welding seam height and density (number of welding seams per five meters of ship side) on drag resistance, a new flexible rotor was designed and used for experimentation. It was found, under the conditions selected, that a so-called fouling release (FR) coating caused approximately 5.6% less skin friction (torque) over time than traditional biocide-based antifouling (AF) coatings at a tangential speed of 12 knots. Furthermore, results of immersion experiments and supporting “standard” water absorption experiments showed that water absorption of the FR coating did not result in any significant impacts on skin friction. On the other hand, water absorption was found to actually lower the skin friction of AF coatings. This may be attributed to a smoothening of the coating surface. The effects of welding seam height and density on drag resistance were found to be substantial when welding seam height is above 5 mm, especially at high tangential speeds (above 15 knots). Using an interpolation approach, the pilot-scale welding seam drag data could be used to estimate the drag resistance at approximated full-scale conditions, equivalent to about one welding seam per five meters of ship side. It was shown, in this case, that the contribution of welding seams to ship skin friction could very well be less significant than those of FCCs when the welding seam height is below 5 mm, a representative value for full-scale welding seam height. Note de contenu : - EXPERIMENTAL SETUP : Flexible cylinder
- MATERIALS AND EXPERIMENTAL PROCEDURES : Seawater immersion experiments - "Standard" water absorption experiments - Welding seam experiments
- RESULTS AND DISCUSSION : Seawater immersion experiments and "standard" water absorption experiments - Welding seam experiments - Comparison of effects of coatings and welding seams on drag resistanceDOI : 10.1007/s11998-018-0054-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0054-7.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30844
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Code-barres Cote Support Localisation Section Disponibilité 20078 - Périodique Bibliothèque principale Documentaires Disponible Drying paths of phase-separating solution coatings exposed to humidity / Masato Yamamura in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 1 (01/2022)
[article]
Titre : Drying paths of phase-separating solution coatings exposed to humidity Type de document : texte imprimé Auteurs : Masato Yamamura, Auteur Année de publication : 2022 Article en page(s) : p. 15-23 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Azéotropes
Diagrammes de phases
Humidité -- Absorption:Eau -- Absorption
Revêtement -- Séchage
Séparation (technologie)
Simulation par ordinateur
Vapeur d'eauIndex. décimale : 667.9 Revêtements et enduits Résumé : Drying process paths, i.e., time-dependent trajectories of solution compositions on a phase diagram, were examined for coatings of a water-immiscible acrylic monomer dissolved in ethanol and exposed to humidity. The absorption of water vapor quenched the solution into a thermodynamic nonequilibrium state and promoted a spontaneous phase separation when the water content in the solution exceeded a critical value. A simultaneous mass-loss and heat-flux measurement technique was proposed and adapted for phase-separating coatings to determine the evaporation rates of two volatile components with different latent heats of vaporization. The measured drying paths agreed with those predicted from a drying model that takes into account the gas-diffusion-limited evaporation and composition-dependent activities. The numerical predictions also revealed that the pseudo-azeotrope determined the critical drying conditions, under which any drying paths on the phase diagram did not cross the two-phase region, and thus the drying solutions remained stable. DOI : https://doi.org/10.1007/s11998-021-00483-z En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00483-z.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37141
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Code-barres Cote Support Localisation Section Disponibilité 23313 - Périodique Bibliothèque principale Documentaires Disponible Dyeing of chamois leather using water soluble sulphure dyes / A. Jaya Prakash in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 10 (10/2016)
[article]
Titre : Dyeing of chamois leather using water soluble sulphure dyes Type de document : texte imprimé Auteurs : A. Jaya Prakash, Auteur ; Rathinam Aravindhan, Auteur ; N. Nishad Fathima, Auteur ; Jonnalagadda Raghava Rao, Auteur Année de publication : 2016 Article en page(s) : p. 383-389 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Colorants
Colorimétrie
Cuirs et peaux -- Propriétés organoleptiques
Cuirs et peaux -- Teinture
Cuirs et peaux de Chamois
Humidité -- Absorption:Eau -- Absorption
pH
Résistance à l'abrasion
Solidité de la couleur
SoufreIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Chamois leathers find application in fuel filtration and cleaning. Recently, use of chamois leathers is explored in the development of sports garments, gloves and other personal wear. However, one of the consumer demand viz. different colors on the end product is not met by chamois leathers. Hence, dyeing is essential to make it more attractive for end user applications. In the present work an attempt has been made to develop colored chamois leather by employing water soluble sulphur dyes. The offer of sulphur dyes have been optimized based on dyeing characteristics, color fastness and color values. The results indicate that offer of 1 and 2% of the dyes show better colour value and fastness to rubbing. Hence, it could be inferred that coloring of chamois leathers not only improved the aesthetic appeal but also helped in adding value without altering inherent properties of chamois leather. Note de contenu : - EXPERIMENTAL SECTION : Materials - Methods : Dyeing of chamois leather - Color measurement of chamois leathers - Color fastness analysis - Water absorption - Organoleptic
- RESULTS AND DISCUSSION : Dyeing of leather matrix - Reaction mechanism and effect of pH - Stability of dye solution towards acid, alkali and hard water - Color measurement of chamois leather - Color fastness - Water absorption - Evaluation of organoleptic propertiesEn ligne : https://drive.google.com/file/d/1qxWDPiimzVoIWkafnFc4jR84urkRyfXC/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27032
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Code-barres Cote Support Localisation Section Disponibilité 18365 - Périodique Bibliothèque principale Documentaires Disponible Effect of chemicals treatments on the morphological, mechanical, thermal and water uptake properties of polyvinyl chloride/palm fibers composites / Hamida Boussehel in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 29, N° 1 (02/2019)
[article]
Titre : Effect of chemicals treatments on the morphological, mechanical, thermal and water uptake properties of polyvinyl chloride/palm fibers composites Type de document : texte imprimé Auteurs : Hamida Boussehel, Auteur ; Djamel Eddine Mazouzi, Auteur ; Noureddine Belghar, Auteur ; Belhi Guerira, Auteur ; Mohamed Lachi, Auteur Année de publication : 2019 Article en page(s) : p. 1-8 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chlorure de polyvinyle
Composites à fibres végétales
Composites à fibres végétales -- Propriétés mécaniques
Composites à fibres végétales -- Propriétés thermiques
Fibres de palmes
Humidité -- Absorption:Eau -- Absorption
Morphologie (matériaux)
Traitement chimiqueIndex. décimale : 668.4 Plastiques, vinyles Résumé : The use of natural resources in composite materials becomes more frequently, as they are low-colt and lightweight materials. In addition, industrial trends tend towards Eco-products, hence the importance of integrating natural products that are recyclable and easily degradable. Aim of this study is prepared polymer composites of polyvinyl chloride (PVC) using palm fibers at different loading (10 and 30 % by weight). Improving the interfacial adhesion between matrix- fluer interfaces using chemical modification of date palm fibers (DPF) by two types of treatments (acetylation, alkali). The effect of chemical treatment and fiber content on morphological, thermal, mechanical and water absorption properties of composites have been studies. It was found that the use of treated fibers in PVC composites improves the mechanical properties and decomposition temperature, and reduce water absorption of the composites. Note de contenu : - MATERIAL AND METHODS : Materials - Chemical treatments of palm fibers - Preparation of PVC composites - Characterization
- RESULTS AND DISCUSSION : FTIR results - Characterization of PVC composites
- Table 1 : Properties of polyvinyl chloride (PVC)
- Table 2 : Thermal degradation and derivative weight loose of each thermal degradation stage with 30 wt% of fiber
- Fig. 1 : FTIR spectra of untreated, acetylated and alkali treated palm fibers
- Fig. 2 : SEM micrographs of PVC composites with : neat PVC, untreated fibers, acetylated and alkaly treated palm fibers
- Fig. 3 : Tensile strength of neat PVC and composites with trated and untreated fibers
- Fig. 4 : Elongation at break of neat PVC and composites with treated and untreated fibers
- Fig. 5 : Shore hardness of neat PVC and composites with treated and untreated fibers
- Fig. 6 : Thermograms of weight loss, and derivative weight loss of neat PVC and composites with 30 wt% of treated and untreated fibers
- Fig. 7 : Water absorption of neat PVC and composites with treated and untreated fibers
DOI : https://doi.org/10.18280/rcma.290101 En ligne : https://www.iieta.org/download/file/fid/6902 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34730
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Code-barres Cote Support Localisation Section Disponibilité 22404 - Périodique Bibliothèque principale Documentaires Disponible Effect of fiber percentage and stacking sequence on mechanical performance of unidirectional hemp and palmyra reinforced hybrid composites / Varanasi Lakshmi Narayana in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 30, N° 3-4 (08/2020)
[article]
Titre : Effect of fiber percentage and stacking sequence on mechanical performance of unidirectional hemp and palmyra reinforced hybrid composites Type de document : texte imprimé Auteurs : Varanasi Lakshmi Narayana, Auteur ; Lokavarapu Bhaskara Rao, Auteur ; Siva Bhaskara Rao Devireddy, Auteur Année de publication : 2020 Article en page(s) : p. 143-151 Note générale : Bibliogr. Langues : Français (fre) Catégories : Chanvre et constituants Le chanvre ou chanvrier (Cannabis sativa L.) est la seule espèce du genre botanique Cannabis. Ce terme latin est souvent utilisé aussi comme nom vernaculaire pour distinguer les variétés de chanvre cultivé à usage industriel des variétés de cannabis à usage récréatif ou médical. C'est une espèce de plante annuelle, de la famille des Cannabaceae. La graine de chanvre s'appelle le chènevis.
Composites à fibres végétales -- Propriétés mécaniques
Essais dynamiques
Fibres de chanvre
Humidité -- Absorption:Eau -- Absorption
Microscopie électronique à balayageIndex. décimale : 668.4 Plastiques, vinyles Résumé : The use of natural fiber reinforced composites gains attention due to its weight and reasonable strength in the recent years. Generally, the mechanical performance of the hybrid composites are superior than the mono fiber reinforced composites. In this work, two different types of natural fibers, namely hemp and palmyra fibers, are selected as reinforcement materials for the development of unidirectional fiber reinforced hybrid composites. Composite laminate was fabricated with four different weight percentages (10 wt.%, 20 wt.%, 30 wt.% and 40 wt.%) and three different hybrid ratios (1:1, 1:2, and 2:1) of hemp and palmyra. The influence of fiber percentage and stacking sequence on the mechanical performance such as tensile strength, flexural strength, impact energy, and hardness of the hybrid composites was evaluated. From the results, it was observed that the adding 30 wt. % of hemp and palmyra fiber can increase the tensile strength and flexural strength by a percentage of 112% and 241% respectively. The impact energy absorption and the hardness of the hybrid composites are examined and compared. The experimental results shows that the hybrid composites containing high fiber weight percentage contribute to significant increase in impact energy and hardness. Morphological analysis is done using Scanning Electron Microscope (SEM). Note de contenu : - EXPERIMENTAL : Materials - Composite preparation Physical and mechanical testing of hybrid composites
- RESULTS AND DISCUSSION : Density and void percentage - Water absorption - Tensile strength - Flexural strength - ILSS - Impact energy - Micro hardness - Interfacial analysis using Scanning Electron Microscope
- Table 1 : Properties of hemp and palmyra fiber
- Table 2. Detailed designation and composition of fabricated composites
- Table 3 : Theoretical, experimental densities and void percentage of the composites
- Table 4 : Comparison of tensile strength (MPa) of hybrid, hemp and palmyra fiber reinforced composites
- Table 5 : Comparison of flexural strength (MPa) of hybrid, hemp and palmyra fiber reinforced compositesDOI : https://doi.org/10.18280/rcma.303-405 En ligne : https://www.iieta.org/download/file/fid/39666 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37640
in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES > Vol. 30, N° 3-4 (08/2020) . - p. 143-151[article]Effect of a novel chemical treatment on the physico-thermal properties of sugarcane nanocellulose fiber reinforced epoxy nanocomposites / H. Mohit in INTERNATIONAL POLYMER PROCESSING, Vol. XXXV, N° 2 (05/2020)
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