Accueil
Résultat de la recherche
4 résultat(s) recherche sur le tag 'lumineuse'
Ajouter le résultat dans votre panier Affiner la recherche Générer le flux rss de la recherche
Partager le résultat de cette recherche
Color and appearance : I / Zeno W. Wicks in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 73, N° 917 (06/2001)
[article]
Titre : Color and appearance : I Type de document : texte imprimé Auteurs : Zeno W. Wicks, Auteur ; Frank N. Jones, Auteur ; S. Peter Pappas, Auteur Année de publication : 2001 Article en page(s) : p. 49-56 Note générale : Bibliogr. Langues : Américain (ame) Tags : Matériau revêtement Peinture Propriété optique Feuil Couleur Aspect Observation visuelle Source lumineuse Contretypage couleur Index. décimale : 667.9 Revêtements et enduits Résumé : Color and the interrelated topic of gloss are important to the decorative aspects of the use of coatings and, sometimes, to the functional aspects of their use. We have all dealt with color since we were babies, but most people have little understanding of color. Many technical people think of it as an aspect of physics dealing with the distribution of visible light. While that is a factor, color is a psychophysical phenomenon. The difficulty of understanding color can be seen by considering the most rigorous definition of color that has been prepared: Color is that characteristic of light by which an observer may distinguish between two structure-free fields of view of the same size and shape. In effect, it says that color is what is left to distinguish between two objects when all the other variables are removed. Not a very satisfying definition. Color has three components: an observer, a light source, and an object. (The single exception is when the light source is the object being viewed.) There is no color on an uninhabited island. This is not just a semantic statement; color requires an observer. There is no color in the absence of light; in a completely darkened room there is no color, not because you cannot see it, but because it is not there. There must be an object; if you look out the window of a spaceship without looking at a planet or star, there is no color-there is an observer, there is light, but there is no object. Another major factor affecting appearance is surface roughness. If a surface is very smooth, it has a high gloss; if it is rough on a scale below the ability of the eye to resolve the roughness, it has a low gloss. If, however, the roughness can be resolved visually, a film may exhibit brush marks, orange peel, texture, and so forth. Furthermore, there can be a combination of small scale and larger scale roughness, so films can, for example, have a low gloss and brush marks or high gloss and orange peel. The eye can resolve irregularities in surface smoothness of approximately 25 mm, depending on the distance from the object. Adding to the complications, color and gloss interact, changing either changes the other. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5748
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 73, N° 917 (06/2001) . - p. 49-56[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 001225 - Périodique Bibliothèque principale Documentaires Disponible Color and appearance : II / Zeno W. Wicks in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 73, N° 918 (07/2001)
[article]
Titre : Color and appearance : II Type de document : texte imprimé Auteurs : Zeno W. Wicks, Auteur ; Frank N. Jones, Auteur ; S. Peter Pappas, Auteur Année de publication : 2001 Article en page(s) : p. 73-81 Note générale : Bibliogr. Langues : Américain (ame) Tags : Matériau revêtement Peinture Propriété optique Feuil Couleur Aspect Observation visuelle Source lumineuse Contretypage couleur Index. décimale : 667.9 Revêtements et enduits Résumé : Color and the interrelated topic of gloss are important to the decorative aspects of the use of coatings and, sometimes, to the functional aspects of their use. We have all dealt with color since we were babies, but most people have little understanding of color. Many technical people think of it as an aspect of physics dealing with the distribution of visible light. While that is a factor, color is a psychophysical phenomenon. The difficulty of understanding color can be seen by considering the most rigorous definition of color that has been prepared: Color is that characteristic of light by which an observer may distinguish between two structure-free fields of view of the same size and shape. In effect, it says that color is what is left to distinguish between two objects when all the other variables are removed. Not a very satisfying definition. Color has three components: an observer, a light source, and an object. (The single exception is when the light source is the object being viewed.) There is no color on an uninhabited island. This is not just a semantic statement; color requires an observer. There is no color in the absence of light; in a completely darkened room there is no color, not because you cannot see it, but because it is not there. There must be an object; if you look out the window of a spaceship without looking at a planet or star, there is no color-there is an observer, there is light, but there is no object. Another major factor affecting appearance is surface roughness. If a surface is very smooth, it has a high gloss; if it is rough on a scale below the ability of the eye to resolve the roughness, it has a low gloss. If, however, the roughness can be resolved visually, a film may exhibit brush marks, orange peel, texture, and so forth. Furthermore, there can be a combination of small scale and larger scale roughness, so films can, for example, have a low gloss and brush marks or high gloss and orange peel. The eye can resolve irregularities in surface smoothness of approximately 25 mm, depending on the distance from the object. Adding to the complications, color and gloss interact, changing either changes the other. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5741
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 73, N° 918 (07/2001) . - p. 73-81[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 001226 - Périodique Bibliothèque principale Documentaires Disponible In a new light / Tom Molamphy in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 196, N° 4502 (07/2006)
[article]
Titre : In a new light Type de document : texte imprimé Auteurs : Tom Molamphy, Auteur Année de publication : 2006 Article en page(s) : p. 43-44 Langues : Anglais (eng) Catégories : Lampes à rayonnement ultraviolet
Revêtements -- Séchage sous rayonnement ultraviolet:Peinture -- Séchage sous rayonnement ultravioletTags : 'Matrice lumineuse semi-conductrice' Index. décimale : 667.9 Revêtements et enduits Résumé : This is an insight into how high intensity UV light sources will revolutionise curing technology.
It is interesting to note that though coatings have evolved and improved significantly over the last few decades, yielding faster cure, better properties, new pigment systems and gloss levels and safer materials, curing lamps has stayed basically the same. However, now that landscape is changing.
With the advent of new-intensity semiconductor UV light sources that can cure wide areas uniformly, radiation curing system customers now have access to clean, energy efficient, long life alternatives to traditional mercury lamp technology. As the new UV sources enter mass production, solid-state UV technology will revolutionise commercial processes like boat building, car repair, floor refinishing and other areas where a safe, portable easy-to-use UV source is critical.
The sources will also enable new applications for the first time. For example, low-temperature curing for temperature sensitive substrates, such as polyolefins is now enable, as is curing in areas where reduced green-house emissions and freedom from toxic waste generation are required.Note de contenu : - The problem with lamps
- SLM : a high intensity alternative to lampsPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27562
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 196, N° 4502 (07/2006) . - p. 43-44[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 005088 - Périodique Bibliothèque principale Documentaires Disponible Revêtements à usages extérieur - Essai de vieillissement artificiel - Norme NF T 30-049 / Association Française de Normalisation (Paris) / Saint-Denis La Plaine : Association Française de Normalisation (AFNOR) (1985)
Titre : Revêtements à usages extérieur - Essai de vieillissement artificiel - Norme NF T 30-049 Type de document : texte imprimé Auteurs : Association Française de Normalisation (Paris) , Auteur Editeur : Saint-Denis La Plaine : Association Française de Normalisation (AFNOR) Année de publication : 1985 Importance : 8 p. Présentation : ill. Format : 30 cm Note générale : Bibliogr. Langues : Français (fre) Catégories : Revêtements -- Normes:Peinture -- Normes
Vernis -- NormesTags : Peinture Vernis Essai vieillissement artificiel Spécimen essai Conditionnement éprouvette Exposition Eau chaleur sèche humide rayonnement Source lumineuse Evaluation Altération Appareillage Norme Index. décimale : 667.9 Revêtements et enduits Résumé : La présente norme décrit des essais de vieillissement accéléré des peintures et des préparations assimilées à usage extérieur.
Ces essais sont par nature conventionnels, aussi une certaine latitude est elle laissée à l'opérateur quant aux appareillages choisis et la combinaison des cycles.
A la fin de la norme, un tableau récapitulatif aide le lecteur à caractériser, par un renvoir aux normes, les altérations constatées.Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7663 Réservation
Réserver ce document
Exemplaires (2)
Code-barres Cote Support Localisation Section Disponibilité N000107 T 30-049 Norme Bibliothèque principale Documentaires Disponible 19820 T 30-049 Norme Bibliothèque principale Documentaires Disponible