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Acceptabilité colorimétrique / Daniel Steen in L'INDUSTRIE TEXTILE, N° 1300 (07-08/1998)
[article]
Titre : Acceptabilité colorimétrique : Comparaison des équations CMC et CIE94 Type de document : texte imprimé Auteurs : Daniel Steen, Auteur Année de publication : 1998 Article en page(s) : p. 55-58 Note générale : Bibliogr. Langues : Français (fre) Catégories : Colorimétrie
Equations
Textiles et tissus -- ApprêtIndex. décimale : 535.6 Couleur Résumé : Dans le textile, l'équation CMC a donné d'excellents résultats pratiques. Le lancement récent de la CIE94 apporte-t-il une plus grande fiabilité dans la détermination des écarts de couleurs ? Note de contenu : - L'espace CIELAB
- Calcul des indices CMC et CIE94
- Comparaison des ellipsoïdes CMC et CIE94
- Comparaison des indices CMC et CIE94
- Equation CMC (l:c)
- Equation CIE 94 (Kl, Kc, Kh)
- Fig. 1 comparaison des indices CMC en inversant le type et le contretype
- Fig. 2 : Mode de détermination de l'ellipsoïde CIE94
- Fig. 3 : Comparaison des évolutions de SI en fonction de la luminosité L*
- Fig. 4 : Comparaison des évolutions de Sc en fonction de la saturation C*
- Fig. 5 : Comparaison des évolutions de Sh en fonction de la teinte h° (saturation C* = 50)Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38889
in L'INDUSTRIE TEXTILE > N° 1300 (07-08/1998) . - p. 55-58[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21959 - Périodique Bibliothèque principale Documentaires Disponible Development of erosion equations for removal of organic coating on carbon fiber reinforced polymer surface by plastic abrasive in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 2 (03/2023)
[article]
Titre : Development of erosion equations for removal of organic coating on carbon fiber reinforced polymer surface by plastic abrasive Type de document : texte imprimé Année de publication : 2023 Article en page(s) : p.671-685 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Abrasifs
Composites à fibres de carbone
Equations
Matériaux -- Détérioration par érosion
Modèles mathématiques
Polyuréthanes
Prévision, Théorie de la
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : Erosion equations were developed to predict the material removal of polyurethane coatings on carbon fiber reinforced plastic (CFRP) surfaces and validated through experimental data. The effects of abrasive properties, process parameters, and organic coating properties (such as fracture toughness and hardness) were considered in the equations. As the erosion angle increased, elastoplastic deformation in the oblique direction and repeated "deformation" in the normal direction were the main reasons for material removal. The ductile erosion behavior was confirmed by experimental data because the maximum erosion rate occurred at an incident angle of 30°. The coefficient and index in the equations were determined by experimental data, and the equations were verified. The developed equations could accurately predict the quantity loss of organic coatings under different particle sizes and particle velocities, and the erosion equations were in good agreement with the experimental data. Note de contenu : - DEVELOPING EROSION EQUATIONS : Modeling of plastic deformation mechanism - Particle rotation analysis
- EXPERIMENTAL DETAILS : Abrasive particles and substrate - Coating system - Experimental procedure
- RESULTS AND DISCUSSION : Determination of abrasive initial velocity index b - Determination of the coefficient f - Determination of coefficient C C - Determination of coefficient C D - Comparison of the model prediction with experiment - Effect of abrasive particle size - Effect of coating characteristics
- Table 1 : Key property indexes of the abrasive
- Table 2 : Properties of continuous carbon fiber reinforced plastic composite
- Table 3 : Related properties of polyurethane coating
- Table 4 : Detailed coating removal experimental conditions
- Table 5 : Model coefficients for fatigue index cDOI : https://doi.org/10.1007/s11998-022-00700-3 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00700-3.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39311
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 2 (03/2023) . - p.671-685[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24056 - Périodique Bibliothèque principale Documentaires Disponible New approach to melt pressure determination during screw channel flow / R. Steller in INTERNATIONAL POLYMER PROCESSING, Vol. 36, N° 2 (2021)
[article]
Titre : New approach to melt pressure determination during screw channel flow Type de document : texte imprimé Auteurs : R. Steller, Auteur ; J. Iwko, Auteur Année de publication : 2021 Article en page(s) : p. 185-192 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Ecoulement bidirectionnel
Ecoulement unidirectionnel
Equations
Fluides newtoniens
Fluides, Mécanique des
Rhéologie
Vis d'extrusionIndex. décimale : 668.4 Plastiques, vinyles Résumé : Basic equations describing steady, two-directional, isothermal and fully developed drag-pressure flow of generalized Newtonian fluid between parallel plates assumed as the appropriate flow model in flat, shallow screw channel, are given. It is shown that the flow output for any generalized Newtonian fluid in the two-directional case can be described by a simple expression with a few parameters depending in a complicated way on pressure gradient, channel geometry and constants of the constitutive model. The expression is also valid for unidirectional flow as the limiting case of the two-directional flow. The parameters must be determined as a rule with numerical methods. To simplify the practical calculations, a few (semi)analytical methods of parameters determination for unidirectional power law flow are discussed first. These methods make possible to calculate analytically the pressure gradient for known output that is typical of screw flow characterization. The results obtained for the unidirectional flow 1-D were generalized to describe the two-directional flow 2-D, which takes into account both longitudinal and transverse velocity components. The generalization is based on translation and dilation of the 1-D flow characteristics by introducing a few additional parameters, which are only dependent on the helix angle and power law exponent. It was found a very good agreement between exact numerical and approximate ( semi)analytical characteristics for both flows. Note de contenu : - Theoretical analysis
- Unidirectional flow (1-d)
- Two-directional flow (2-d)
- Table 1 : Coefficients of polynomials in two variables for parameters in 2-D flow
DOI : https://doi.org/10.1515/ipp-2020-4007 En ligne : https://drive.google.com/file/d/16sA9YpARbJTN3O4UCNXgr510Zuobz7lw/view?usp=shari [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36362
in INTERNATIONAL POLYMER PROCESSING > Vol. 36, N° 2 (2021) . - p. 185-192[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23732 - Périodique Bibliothèque principale Documentaires Disponible Process model for multilayer slide coating of polymer electrolyte membrane fuel cells / Kristianto Tjiptowidjojo in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 1 (01/2022)
[article]
Titre : Process model for multilayer slide coating of polymer electrolyte membrane fuel cells Type de document : texte imprimé Auteurs : Kristianto Tjiptowidjojo, Auteur ; Janghoon Park, Auteur ; Scott A. Mauger, Auteur ; Michael Ulsh, Auteur ; Peter Randall Schunk, Auteur Année de publication : 2022 Article en page(s) : p. 73-81 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Eléments finis, Méthode des
Encre
Equations
Fluides, Mécanique des
Piles à combustible
Revêtements multicouches
Slide coatingIndex. décimale : 667.9 Revêtements et enduits Résumé : Slide coating is a precision method suitable for depositing multiple liquid-film layers simultaneously. Originally developed in the photographic film industry, it has been deployed for manufacturing of other products that benefit from multilayer coatings. One emerging application is the manufacture of polymer electrolyte membrane fuel cells (PEMFCs), which are used to produce electricity through electrochemical reactions of hydrogen and oxygen gas. The membrane-electrode assembly (MEA), in which key electrochemical reactions occur, consists of three layers that are typically deposited separately in serial fashion and then laminated together to form the three-layer MEA, i.e., three sequential steps of coat and dry. Adapting the process to simultaneous, multilayer slide coating of all three layers will save equipment cost and space while minimizing possible exposure to contaminants during transition between the steps. We are developing a three-layer slide coating model to aid the manufacturing process design of PEMFC. The model accounts for rheology of each layer, which typically exhibit shear thinning behavior. Model predictions are used to investigate simultaneous coatability of catalyst inks and to determine the best layer-by-layer ink selection. Note de contenu : - Governing equations and solution method
- Table 1 Geometry description of slide die used in this study. Refer to Fig. 1 for the nomenclature
- Table 2 Physical properties of inks used in the slide coating flow model. No surface tension and contact angles values needed for Nafion due to being in the middle layerDOI : https://doi.org/10.1007/s11998-021-00508-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00508-7.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37146
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Code-barres Cote Support Localisation Section Disponibilité 23313 - Périodique Bibliothèque principale Documentaires Disponible Using symbolic regression models to predict the pressure loss of non-newtonian polymer-melt flows through melt-filtration systems with woven screens / S. Pachner in INTERNATIONAL POLYMER PROCESSING, Vol. 36, N° 4 (2021)
[article]
Titre : Using symbolic regression models to predict the pressure loss of non-newtonian polymer-melt flows through melt-filtration systems with woven screens Type de document : texte imprimé Auteurs : S. Pachner, Auteur ; W. Roland, Auteur ; M. Aigner, Auteur ; C. Marschik, Auteur ; U. Stritzinger, Auteur ; J. Miethlinger, Auteur Année de publication : 2021 Article en page(s) : p. 435-450 Note générale : Appendice - Nomenclature - Bibliogr. Langues : Anglais (eng) Catégories : Armures (tissage) L'armure, dans la terminologie du tissage de textile, est le mode d'entrecroisement des fils de chaîne et des fils de trame.
Il existe trois armures principales : toile, sergé et satin. À partir de ces trois armures sont fabriqués de nombreux tissus avec aussi des combinaisons des armures principales.
Equations
Etat fondu (matériaux)
Filtration
Fluides non newtoniens
Polymères -- Recyclage
Pression
Rhéologie
Simulation par ordinateurIndex. décimale : 668.4 Plastiques, vinyles Résumé : When selecting a melt-filtration system, the initial pressure drop is a critical parameter. We used heuristic optimization algorithms to develop general analytical equations for estimating the dimensionless pressure loss of square and Dutch woven screens in polymer processing and recycling. We present a mathematical description – without the need for further numerical methods – of the dimensionless pressure loss of non-Newtonian polymer melt-flows through woven screens. Applying the theory of similarity, we first simplified, and then transformed into dimensionless form, the governing equations. By varying the characteristic independent dimensionless influencing parameters, we created a comprehensive parameter set. For each design point, the nonlinear governing equations were solved numerically. We subsequently applied symbolic regression based on genetic programming to develop models for the dimensionless pressure drop. Finally, we validated our models against experiments using both virgin and slightly contaminated in-house and post-industrial recycling materials. Our regression models predict the experimental data accurately, yielding a mean relative error of MRE = 13.7%. Our modeling approach, the accuracy of which we have proven, allows fast and stable prediction of the initial pressure drop of polymer-melt flows through square woven and Dutch weave screens, rendering further numerical simulations unnecessary. Note de contenu : - Non-newtonian flow analysis - Geometry - Governing equations - Theory of similarity
- Numerical solution : Numerical simulation - Numerical results and discussion
- Regression analysis : Symbolic regression modeling - Symbolic regression results and discussion
- Experimental validation :
- Table 1 : Performance of various filter media
- Table 2 : Range of values of PD and n defined by minimum, maximum and step size
- Table 3 : Range of values of A, D and n, defined by minimum, maximum and step size
- Table 4 : Target and input variables for symbolic regression modeling
- Table 5 : Mathematical building blocks provided to the heuristic optimization algorithm
- Table 6 : Results of the error analysis assessing the accuracy of the models developed
- Table 7 : Filtration parameters of the square-woven (SW) and Dutch-weave (DW) metal screens used
- Table 8 : Results of the error analysis of the approximation models for square-weave and Dutch-weave screensDOI : https://doi.org/10.1515/ipp-2020-4019 En ligne : https://drive.google.com/file/d/13QLZw5Ek03dOo1EksPxH18yFIx-s1Fr9/view?usp=shari [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36717
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Code-barres Cote Support Localisation Section Disponibilité 23734 - Périodique Bibliothèque principale Documentaires Disponible