Bibliographies thématiques / Fibred surface

Sommaire

Articles de revues
Thèses
Livres
Chapitres de livres
Actes de conférences
Rapports d'organisations

Littérature scientifique sur le sujet « Fibred surface »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 10 mars 2023

Créez une référence correcte selon les styles APA, MLA, Chicago, Harvard et plusieurs autres

Choisissez une source :

Consultez les listes thématiques d’articles de revues, de livres, de thèses, de rapports de conférences et d’autres sources académiques sur le sujet « Fibred surface ».

À côté de chaque source dans la liste de références il y a un bouton « Ajouter à la bibliographie ». Cliquez sur ce bouton, et nous générerons automatiquement la référence bibliographique pour la source choisie selon votre style de citation préféré : APA, MLA, Harvard, Vancouver, Chicago, etc.

Vous pouvez aussi télécharger le texte intégral de la publication scolaire au format pdf et consulter son résumé en ligne lorsque ces informations sont inclues dans les métadonnées.

Articles de revues sur le sujet "Fibred surface"

Lines, Daniel. « Stable Plumbing for High Odd-Dimensional Fibred Knots ». Canadian Mathematical Bulletin 30, n^o 4 (1 décembre 1987) : 429–35. http://dx.doi.org/10.4153/cmb-1987-063-4.

Texte intégral

Résumé :

AbstractPlumbing a Hopf band on the fibre-surface of a simple fibred knot is a geometric operation that produces another such knot. We show by algebraic methods that every high odd-dimensional simple fibred knot is obtained from the unknot by using this operation and its inverse.

Styles APA, Harvard, Vancouver, ISO, etc.

Serrano, Fernando. « The sheaf of relative differentials of a fibred surface ». Mathematical Proceedings of the Cambridge Philosophical Society 114, n^o 3 (novembre 1993) : 461–70. http://dx.doi.org/10.1017/s0305004100071759.

Texte intégral

Résumé :

AbstractLet Φ: S → C denote a fibration from a smooth projective surface onto a smooth curve, with fibres of genus ≥2. The double dual of the sheaf of relative differentials has been studied by F. Serrano [14]. There, it was proved that dim grows asymptotically as the square of n in case Φ is not isotrivial (i.e. fibres vary in modulus), and the converse holds true in most cases, in a way that can be made precise. In the non-isotrivial case, the present paper provides further information about by analysing the linear systems for large n. If P denotes the positive part of in its Zariski decomposition, then it is shown that |rP| is eventually base-point free for some r > 0. Furthermore, Proj is a normal projective surface, fibred over C, birational to S, and with only rational singularities.

Styles APA, Harvard, Vancouver, ISO, etc.

Barja, Miguel Ángel, et Francesco Zucconi. « On the slope of fibred surfaces ». Nagoya Mathematical Journal 164 (décembre 2001) : 103–31. http://dx.doi.org/10.1017/s0027763000008060.

Texte intégral

Résumé :

We give an asymptotically sharp lower bound for the slope λ(f) of a fibration f : S → B, where S is a surface and B is a curve, if there exists an involution on the general fibre F of f. We also construct a new lower bound of λ(f) depending increasingly on the irregularity of S; as an application of this new bound we have a criteria to control the existence of other fibrations on S.

Styles APA, Harvard, Vancouver, ISO, etc.

Catanese, Fabrizio, et Michael Dettweiler. « Vector bundles on curves coming from variation of Hodge structures ». International Journal of Mathematics 27, n^o 07 (juin 2016) : 1640001. http://dx.doi.org/10.1142/s0129167x16400012.

Texte intégral

Résumé :

Fujita’s second theorem for Kähler fibre spaces over a curve asserts, that the direct image [Formula: see text] of the relative dualizing sheaf splits as the direct sum [Formula: see text], where [Formula: see text] is ample and [Formula: see text] is unitary flat. We focus on our negative answer [F. Catanese and M. Dettweiler, Answer to a question by Fujita on variation of Hodge structures, to appear in Adv. Stud. Pure Math.] to a question by Fujita: is [Formula: see text] semiample? We give here an infinite series of counterexamples using hypergeometric integrals and we give a simple argument to show that the monodromy representation is infinite. Our counterexamples are surfaces of general type with positive index, explicitly given as abelian coverings with group [Formula: see text] of a Del Pezzo surface [Formula: see text] of degree 5 (branched on the union of the lines of [Formula: see text], which form a bianticanonical divisor), and endowed with a semistable fibration with only three singular fibres. The simplest such surfaces are the three ball quotients considered in [I. C. Bauer and F. Catanese, A volume maximizing canonical surface in 3-space, Comment. Math. Helv. 83(1) (2008) 387–406.], fibred over a curve of genus 2, and with fibres of genus 4. These examples are a larger class than the ones corresponding to Shimura curves in the moduli space of Abelian varieties.

Styles APA, Harvard, Vancouver, ISO, etc.

Leigh, Oliver. « UNWEIGHTED DONALDSON–THOMAS THEORY OF THE BANANA 3-FOLD WITH SECTION CLASSES ». Quarterly Journal of Mathematics 71, n^o 3 (8 juin 2020) : 867–942. http://dx.doi.org/10.1093/qmathj/haaa007.

Texte intégral

Résumé :

Abstract We further the study of the Donaldson–Thomas theory of the banana 3-folds which were recently discovered and studied by Bryan [3]. These are smooth proper Calabi–Yau 3-folds which are fibred by Abelian surfaces such that the singular locus of a singular fibre is a non-normal toric curve known as a ‘banana configuration’. In [3], the Donaldson–Thomas partition function for the rank 3 sub-lattice generated by the banana configurations is calculated. In this article, we provide calculations with a view towards the rank 4 sub-lattice generated by a section and the banana configurations. We relate the findings to the Pandharipande–Thomas theory for a rational elliptic surface and present new Gopakumar–Vafa invariants for the banana 3-fold.

Styles APA, Harvard, Vancouver, ISO, etc.

Scheyer, Torsten M., Elena V. Syromyatnikova et Igor G. Danilov. « Turtle shell bone and osteoderm histology of Mesozoic and Cenozoic stem-trionychian Adocidae and Nanhsiungchelyidae (Cryptodira : Adocusia) from Central Asia, Mongolia, and North America ». Fossil Record 20, n^o 1 (3 février 2017) : 69–85. http://dx.doi.org/10.5194/fr-20-69-2017.

Texte intégral

Résumé :

Abstract. The record of fossil turtles from the Cretaceous and Cenozoic of Asia and North America is very rich, including several lineages of cryptodiran turtles. Here we survey the shell bone histology of two important closely related groups of stem trionychians, the Adocidae and Nanhsiungchelyidae, which have representatives in both Asia and North America. All studied taxa show shell bones in which the diploe is framed by well-developed cortical compact bone layers. Taxa of both groups also express external regular surface sculpturing of their shell bones, and in the case of the nanhsiungchelyid genus Basilemys also on the osteoderms, which is also reflected in the internal histological bone structures. Besides similarities of the regular ornamentation patterns, both groups share a number of microanatomical and histological characters such as the zonation of external cortex with rather homogeneous fine-fibred interwoven structural fibres (ISF) in the more internal zone and a dominance of vertically oriented fibres in the ISF and the presence of growth marks in the more external zone. On the other hand, growth marks, i.e. lines of arrested growth, which are visible as wavy lines in thin sections, extend subparallel to the external bone surface in adocids, but they are not parallel/subparallel in nanhsiungchelyids. Thickness and structure of bone trabeculae in the cancellous interior regions depends on the shell bone thickness of the individual samples. The internal cortices of all taxa except the North American samples of Adocus usually consist of parallel-fibred bone that locally grades into lamellar bone. Secondary bone remodelling is more frequent in nanhsiungchelyids compared to adocids, and Sharpey's fibres that extend perpendicular to the bone margins extending across subparallel growth marks are more commonly found in adocids. In addition, bone histology served to identify trionychid specimens in the adocid and nanhsiungchelyid samples, especially as bone surface sculpturing patterns were weathered or eroded in those cases. The histological data present thus supplement the numerous previously reported differences in external shell morphology between adocids and nanhsiungchelyids on the one hand and trionychids and carettochelyids on the other.

Styles APA, Harvard, Vancouver, ISO, etc.

HILL, PETER, et KUNIO MURASUGI. « ON DOUBLE-TORUS KNOTS (II) ». Journal of Knot Theory and Its Ramifications 09, n^o 05 (août 2000) : 617–67. http://dx.doi.org/10.1142/s0218216500000359.

Texte intégral

Résumé :

A double-torus knot is a knot embedded in a genus two Heegaard surface [Formula: see text] in S3. We consider double-torus knots L such that [Formula: see text] is connected, and consider fibred knots in various classes.

Styles APA, Harvard, Vancouver, ISO, etc.

CAI, JIN-XING. « On Abelian automorphism groups of fibred surfaces of small genus ». Mathematical Proceedings of the Cambridge Philosophical Society 130, n^o 1 (janvier 2001) : 161–74. http://dx.doi.org/10.1017/s0305004100004758.

Texte intégral

Résumé :

It is proved that, for a complex minimal smooth projective surface S of general type with a pencil of genus g = 3 or 4, any Abelian automorphism group of S is of order [les ] 12K2S + 96(g − 1), provided K2S > 8(g − 1)2, where KS is the canonical divisor of S.

Styles APA, Harvard, Vancouver, ISO, etc.

Yu, Jing, Yumeng Tian, Zaiwen Lin, Qi Liu, Jingyuan Liu, Rongrong Chen, Hongsen Zhang et Jun Wang. « NiSe2/Ni5P4 nanosheets on nitrogen-doped carbon nano-fibred skeleton for efficient overall water splitting ». Colloids and Surfaces A : Physicochemical and Engineering Aspects 614 (avril 2021) : 126189. http://dx.doi.org/10.1016/j.colsurfa.2021.126189.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Subramanya, Raghavendra, et S. S. Prabhakara. « Surface Modification of Banana Fiber and its Influence on Performance of Biodegradable Banana-Cassava Starch Composites ». Applied Mechanics and Materials 895 (novembre 2019) : 15–20. http://dx.doi.org/10.4028/www.scientific.net/amm.895.15.

Texte intégral

Résumé :

Natural fibers, in particularly lignocellulosic fibers are attracting material scientists now days, due to their comparative advantages over synthetic fibers. Biodegradable composites reinforced with short banana fibre after alkali treatment along with cassava starch matrix were prepared using the hot compression method. The mechanical properties like tensile strength and impact strength were investigated. Mechanical properties of the composites made from alkali treated fibres were superior to the untreated fibres. SEM observations on the fracture surface of composites showed that the surface modification of the fibre occurred and improved fibre–matrix adhesion. Keywords: Surface modification; banana fiber; Biodegradable composites; Mechanical properties; Matrix.

Styles APA, Harvard, Vancouver, ISO, etc.

Plus de sources

Thèses sur le sujet "Fibred surface"

RIVA, ENEA. « Slope inequalities for fibred surfaces and fibreed threefolds ». Doctoral thesis, Università degli Studi di Milano-Bicocca, 2022. http://hdl.handle.net/10281/374266.

Texte intégral

Résumé :

Su una varieta algebrica fibrata si definesce un invariante relativo detto slope che ne specifica la natura. Per queste fibrazioni un ruolo importante è svolto del fibrato di Hodge e dagli invarianti geometrici delle fibre generiche. In particulare in questa tesi ci concentreremo su superfici e threefold fibrati su curve, dando un stima dal basso della slope che dipenda del rango unitario del fibrato di hodge e da: - indice di clifford cella curva generale, nel caso di superfici; -dal genere geometrico ($p_{g}$) della superficie generale nel caso di threefold. infine sfrutteremo i risultati ottenuti sui threefold per definere un upper bound del rango unitario $u_{f}$ in funzione di $p_{g}$ sotto l'ipotesi che il genere della curva base sia zero o uno.
On a fibred algebraic variety, is defined a relative invariant called slope which classifies the variety itself. For these fibration a main character is played by the Hodge bundle and by the geometric invariants of the general fibers. In particular in this thesis we focus on surfaces and threefolds fibred over curves, and we give a lower bound for the slope which depends on the unitary rank of the hodge bundle and on: -the clifford index of the general curve, in case of fibred surfaces; - the geometric genus ($p_{g}$) of the general surface, in case of threefolds. Finally we use these results on fibred threefolds to make a new upper bound for the unitary rank $u_{f}$ depending on $p_{g}$ under the hypothesis that the genus of the base curve is zero or one.

Styles APA, Harvard, Vancouver, ISO, etc.

Acera, Fernandez José. « Modification of flax fibres for the development of epoxy-based biocomposites : Role of cell wall components and surface treatments on the microstructure and mechanical properties ». Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS218.

Texte intégral

Résumé :

Les fibres végétales peuvent être considérées comme une alternative intéressante aux fibres de verre pour la fabrication de matériaux composites. En effet, elles présentent des caractéristiques physiques intéressantes, telles que leur faible densité et leurs bonnes propriétés mécaniques spécifiques, qui peuvent rivaliser avec les composites renforcés de fibres de verre. En outre, les fibres végétales sont obtenues à partir de ressources renouvelables, et présentent généralement moins d'impacts environnementaux lors de leurs phases de production, d’utilisation et en fin de vie. Contrairement aux fibres de verre, les fibres végétales, telles que des fibres de lin, présentent des structures hiérarchiques complexes composées essentiellement de cellulose, hémicellulose, lignine, ciments peptiques et extractibles lipophiliques (cires, acides gras, etc.). Cette composition varie selon les espèces, le lieu et les conditions de croissance, la maturité de la plante, etc. De la même façon, la composition biochimique et la structure des produits et des sous-produits issus du lin sont soumis à de grandes variations selon les étapes successives de transformation réalisées à partir des tiges de lin jusqu’aux fils et tissus. Cela influence fortement les propriétés finales des fibres de lin et de leurs biocomposites. La première partie de cette étude se concentre sur la caractérisation de fibres de lin au cours de leurs étapes successives de transformation. Une homogénéisation de la composition chimique est observée dans les étapes finales de transformation, ainsi qu’une augmentation des propriétés en traction longitudinale des mèches de fibres de lin. La deuxième partie traite de l'utilisation de différents traitements de lavage appliqués sur des tissus d’étoupes de lin et leur influence sur l'extraction des composants de la paroi cellulaire des fibres, ainsi que sur la microstructure et les propriétés mécaniques de biocomposites époxy/lin. Il est montré que les composants de la paroi cellulaire jouent un rôle clé dans la dispersion des mèches et des fibres élémentaires de lin et sur le comportement mécanique transversal de leurs biocomposites. Enfin, l'application de différents traitements de fonctionnalisation sur des tissus de fibre de lin est étudiée afin d'améliorer l'adhérence interfaciale entre les fibres et la matrice. L'utilisation de molécules de type organosilanes (aminosilane, époxysilanes) et de molécules biosourcés (acides aminés et polysaccharides) est étudiée. Une augmentation de la rigidité en traction longitudinale et de la rigidité et de la contrainte maximale en traction transverse est observée en raison de l'amélioration de l'adhésion interfaciale par la fonctionnalisation de surface des fibres avec des molécules d'origine biosourcé et non-biosourcé
Natural fibres can be considered as a relevant alternative to glass fibres in the manufacture of composite materials. Indeed, they present interesting physical characteristics, such as low density and good specific mechanical properties, which can compete with glass fibre reinforced composites. Moreover, natural fibres are obtained from renewable resources, and generally present lower environmental impacts during their production and use phases and their end of life. Unlike glass fibres, natural fibres, such as flax fibres, are complex hierarchical materials composed essentially of cellulose, hemicellulose, lignin, peptics cements and lipophilic extractives (waxes, fatty acids, etc.). This composition varies among species, collection site, plant maturity, batches, etc. Besides, the biochemical composition and structure of flax products and sub-products undergo wide variations according to the transformation steps from stems to yarns and fabrics. This influences greatly the final properties of flax fibres and their biocomposites. The first part of this study is focused on the characterization of flax fibres during their successive transformation steps. A homogenization of the chemical composition is observed at the final transformation steps, as well as an increment of the longitudinal tensile properties of flax yarns. The second part deals with the use of different washing treatments applied on flax tow fabrics and their influence on the extraction of flax cell wall components and the resulting microstructure and mechanical properties of epoxy/flax fibres reinforced biocomposites. It is shown that cell wall components play a key role in the flax yarns and elementary fibres dispersion and transverse mechanical behaviour of biocomposites. Finally, the application of different functionalization treatments onto flax fibres fabrics is investigated in order to improve the interfacial adhesion between fibres and matrix. The use of non-bio-based organosilane molecules (aminosilane, epoxysilane) and bio-based molecules (amino-acids and polysaccharides) is studied. Improvedstiffness in longitudinal tension test and stiffness and tensile strength in transverse tension test are observed due to the improvement of interfacial adhesion by surface functionalization of the fibres with both bio-based and non-bio-based molecules

Styles APA, Harvard, Vancouver, ISO, etc.

Zhang, Jing. « Différents traitements de surface des fibres de carbone et leur influence sur les propriétés à l'interface dans les composites fibres de carbone/résine époxyde ». Thesis, Châtenay-Malabry, Ecole centrale de Paris, 2012. http://www.theses.fr/2012ECAP0038/document.

Texte intégral

Résumé :

Les matériaux composites à base de fibres de carbone (CF) sont actuellement très utilises dans le domaine de l’aérospatiale, de la construction et du sport grâce à leurs excellentes propriétés mécaniques, une faible densité et une haute stabilité thermique. Les propriétés des composites dépendent fortement de la nature et de la qualité de l’interface fibre/matrice. Une bonne adhérence interfaciale permet un meilleur transfert de charge entre la matrice et les fibres. Les CFs sans traitement sont chimiquement inertes et présentent donc une faible adhérence vis-à-vis de la résine époxyde. Par ailleurs, les faibles propriétés transversales et interlaminaires limitent sensiblement la performance et la durée de vie des composites. Par conséquent, un type de renfort à base de fibres traitées est fortement souhaité pour améliorer les propriétés globales des composites, en particulier l'adhésion interfaciale entre les fibres et la matrice. Dans cette thèse, trois types de traitement de surface, l’ensimage, le traitement thermique et la croissance de nanotubes (CNTs), ont été appliqués aux CFs. En particulier, les CFs greffées de CNTs, se combinant avec les deux autres traitements, montrent la meilleure adhérence interfaciale avec la matrice époxyde. L’ensimage proposé peut améliorer la performance du CNT-CF hybride et minimiser les dommages aux fibres lors de la manipulation ultérieure tels que le transport et la préparation de composites. Tout d’abord, l’ensimage a été réalisé sur la surface des fibres par dépôt de résine époxyde en solution. L’ensimage permet de protéger les filaments au cours de la mise en oeuvre et favorise également la liaison fibre/matrice. Différentes formulations d’ensimage selon les proportions époxy/durcisseur ont été utilisées. La quantité d'ensimage déposée sur les fibres de carbone a été contrôlée en faisant varier la concentration de la solution d’ensimage. Ensuite, un traitement thermique, effectué sous un mélange de gaz à 600-750 oC, a permis de modifier la surface des CFs. L'influence de la composition du gaz, du temps de traitement et de la température sur les propriétés interfaciales des composites CFs/époxy a été systématiquement quantifiée. Enfin, des CNTs ont été greffés sur les CFs par une méthode de dépôt chimique en phase vapeur en continu afin d’obtenir un nouveau type de renfort hybride multi-échelle. Les CNTs greffés permettent d’augmenter la surface de contact et d’améliorer l’accrochage mécanique de la fibre avec la résine. De plus, ils pourraient améliorer la résistance au délaminage, les propriétés électriques et thermiques des composites. Les CFs greffées de CNTs de différentes morphologies et densités ont été produites en faisant varier les conditions de croissance. Après le traitement de surface, les essais de fragmentation ont été menés afin d’évaluer la résistance au cisaillement interfacial (IFSS) des composites CFs/époxy. Par rapport aux fibres vierges, l’ensimage et le traitement thermique ont contribué à une augmentation de l'IFSS de 35% et de 75%, respectivement. L'adhésion interfaciale entre la matrice époxyde et les fibres greffées avec CNTs pourrait être adaptée en faisant varier la morphologie, la densité de nombre et la longueur de CNT. Les CFs greffées avec 2% en masse de CNTs (10nm de diamètre) ont entraîné une amélioration de l'IFSS de 60%. Un traitement thermique et un ensimage pourraient contribuer à une augmentation supplémentaire de 108%. Il convient de mentionner que la dégradation des fibres n’a pas été observée après les divers traitements précédemment évoqués. Les résultats de ces travaux pourraient mener au développement de ces techniques à plus grande échelle pour la conception de structures à base de composites CFs/époxy
Carbon fiber (CF)-reinforced polymer composites are widely used in aerospace, construction and sporting goods due to their outstanding mechanical properties, light weight and high thermal stabilities. Their overall performance significantly depends on the quality of the fiber-matrix interface. A good interfacial adhesion provides efficient load transfer between matrix and fiber. Unfortunately, untreated CFs normally are extremely inert and have poor adhesion to resin matrices. Meanwhile, poor transverse and interlaminar properties greatly limit the composite performance and service life. Therefore, a new kind of fiber-based reinforcement is highly desired to improve the overall composite properties, especially the interfacial adhesion between fiber and matrix. In this thesis, three kinds of surface treatment, including sizing, heat treatment and carbon nanotube (CNT) growth, were applied to CFs. In particular, CFs grafted with CNTs, combining with the other two treatments demonstrate superior interfacial adhesion to the tested epoxy matrix. The proposed epoxy sizing can improve the CNT-CF hybrid performance and prevent fiber damage during the subsequent handling such as transport and composite preparation. Firstly, epoxy-based sizing was applied onto the CF surface by the deposition from polymer solutions. Sizing could not only protect the carbon fiber surface from damage during processing but also improve their wettability to polymer matrix. A detailed study was conducted on the influence of the ratio of epoxy and amine curing agent in the sizing formulation. The sizing level on the fiber surface was controlled by varying the concentration of polymer solutions. Secondly, heat treatment in a gas mixture at 600-750 oC was used to modify the carbon fiber surface. The effect of gas mixture composition, treatment time and temperature on the interface was evaluated systematically. Thirdly, CNTs were in-situ grafted on the carbon fiber surface by a continuous chemical vapour deposition (CVD) process to obtain hierarchical reinforcement structures. These hybrid structures have the potential to improve the interfacial strength of fiber/epoxy composites due to the increased lateral support of the load-bearing fibers. Meanwhile, the CNT reinforcement could improve the composite delamination resistance, electrical and thermal properties. The CF grown with CNTs of different morphologies and densities were produced by varying CVD conditions. After the surface treatment, single fiber fragmentation test was used to assess the interfacial shear strength (IFSS) of carbon fiber/epoxy composites. Compared with the as-received CFs, the epoxy sizing and the heat treatment contributed to an improvement in IFSS of up to 35% and 75%, respectively. The interfacial adhesion between epoxy matrix and CNT-grafted fibers could be tailored by varying the CNT morphology, number density and length. The CFs grafted with 2 wt% CNTs of 10 nm in diameter resulted in an improvement in IFSS of around 60%. A further heat treatment and epoxy sizing could contribute to an additional increase of 108%. It’s worth to mention that no significant strength degradation of the fibers was observed after the surface treatments. This work could support the development of large-scale approach to CF surface treatment, and throw light on the design of structurally efficient CF/epoxy composites

Styles APA, Harvard, Vancouver, ISO, etc.

Walliser, André. « Caractérisation des interactions liquide-fibre élementaire par mouillage ». Mulhouse, 1992. http://www.theses.fr/1992MULH0248.

Texte intégral

Résumé :

Un système expérimental, Microwetting (marque Du Pont de Nemours), a été développé dans le but de déterminer, localement et avec précision, l'énergie de surface de fibres élémentaires par mouillage. Un faible volume de liquide est mis en contact avec une fibre en un endroit sélectionné de la surface. En l'absence d'étalement spontané, se forme alors une goutte de liquide qui adopte une conformation soit axisymétrique soit non-axisymétrique par rapport à l'axe de la fibre. Dans le premier cas, l'angle de contact entre la goutte et la fibre est calculé grâce à une équation qui relie l'angle au diamètre de la fibre, à la longueur et au diamètre de la goutte. Dans le cas d'une conformation non-axisymétrique, nous avons établi un modèle fondé sur la projection mathématique, aux volumes de gouttes nuls, des variations de paramètres géométriques de la goutte. Ce modèle conduit à la détermination de l'angle de contact représentatif des interactions à l'interface. Ainsi les mesures par mouillage sur fibres élémentaires permettent le calcul des composantes dispersive et non-dispersive de l'énergie superficielle quelles que soient les manifestations macroscopiques des interactions solide-liquide

Styles APA, Harvard, Vancouver, ISO, etc.

Limaiem, Sarra. « Étude et développement d’une interface fibre-matrice spécifique dans les composites à matrice thermoplastique renforcés en fibres de verre continues ». Thesis, Mulhouse, 2016. http://www.theses.fr/2016MULH8553.

Texte intégral

Résumé :

Au cours de cette étude, il a été question de développer une méthodologie d’élaboration et d’évaluation de la qualité de l’interface fibre-matrice au sein d’un composite à matrice polyamide 12 renforcé par du verre. Un modèle macroscopique a été élaboré dans un premier temps sous forme d’un assemblage lame de verre/film polyamide 12, et plusieurs promoteurs d’adhésion, principalement des organosilanes, de fonctionnalités différentes et compatibles avec la matrice polyamide ont été testés. La qualité du greffage a pu être caractérisée grâce à des techniques d’analyses physico-chimiques adaptées (AFM, PM-IRRAS, mouillabilité,…), et la performance adhésive des assemblages a pu être évaluée par des tests mécaniques spécifiques (pelage, clivage). Dans une seconde étape, le protocole de dépôt décrit à l’échelle macroscopique a été adapté à l’échelle des fibres de verre, plus particulièrement à l’échelle mésoscopique des fibres optiques. Des essais mécaniques spécifiques à l’échelle microscopique (fragmentation) ont été réalisés afin d’évaluer la performance adhésive de l’interface dans les assemblages concernés. Une étude focalisée sur la compréhension des mécanismes interfaciaux a également été réalisée afin de clarifier la nature des interactions établies à l’interface fibre-matrice. Grâce aux différentes techniques de caractérisation physico-chimiques il a été possible de mettre en évidence l’influence de différents paramètres expérimentaux, tels que la durée du greffage, la densité de greffage et la chimie des surfaces traitées, sur la cristallisation de la matrice à l’interface. La dernière partie de ce travail de thèse concerne le passage à l’échelle du semi-produit sous forme de rubans. Des analyses des propriétés de l’interface ainsi que des caractéristiques mécaniques ont été réalisées
During this study, the aim was to develop a methodology to elaborate and evaluate the quality of the fiber-matrix interface in a glass fiber reinforced polyamide 12 composite.At first, a macroscopic model was developed using a glass slide/polyamide 12 film assembly. Several organosilane adhesion promoters with different features and compatible with the polyamide matrix were tested. The grafting quality was characterized through appropriate physico-chemical analytical techniques (AFM, PM-IRRAS, Wetting…), and the adhesive performance of the assemblies was evaluated by specific mechanical tests (Peel test, Wedge test). In a second step, the deposition procedure described in macroscopic scale has been adapted to the glass fibers’ scale, more particularly to optical fibers. Specific mechanical tests were performed (fragmentation test) to assess the adhesive performance at the interface of the concerned assemblies.A study focused on the understanding of the interfacial mechanisms was also conducted to clarify the nature of the interactions established at the fiber-matrix interface. Thanks to the different physico-chemical characterization techniques, it has been possible to demonstrate the influence of various experimental parameters such as the surface treatment time, the grafting density and the chemistry on the treated surfaces on the crystallization of the matrix at the interface. The last part of this work concerns the transition to the semi-scale form of ribbons. The analysis of the interface’s properties and the mechanical characteristics has been investigated

Styles APA, Harvard, Vancouver, ISO, etc.

Raj, Gijo. « Interfacial interactions in Flax fibre / PLA biocomposite : from model surfaces to real fibres ». Lorient, 2010. http://www.theses.fr/2010LORIS197.

Texte intégral

Résumé :

The overall mechanical properties of natural fibre reinforced biocomposites are largely governed by the intrinsic strength of reinforcement fibres as well as by the level of adhesion between the fibres and the matrix polymer. The research work reported in this manuscript presents a model investigation of the adhesion properties of the major polysaccharides in flax and a polylactic acid polymer matrix, and a correlation between these interactions and the final mechanical properties of the fibre and the composite. The main objective of this multi-length scale analysis is to better understand the complex role of the different polysaccharides present in flax fibres at the biocomposite interface. We first submit a raw flax fibre to two separate treatments, an enzymatic and an alkali one, which are known to indirectly promote the adherence between the reinforcement fibre and a PLA matrix. The detailed investigation of the morphology, mechanical and adherence properties of the treated fibres allows to observe the removal of the middle and primary layers down to the cellulose microfibrils networks of the secondary layers, and underlines the importance of limiting the attack of encrusting amorphous hemicellulose matrix within the secondary layer that is essential both in order to maintain interesting material properties and to promote adhesion with PLA. In a second time, we adapt the colloidal force microscopy to directly probe interaction forces between PLA and the different polymers in flax fibre. The system was first tested on cellulose and PLA to estimate the Hamaker constant and the work of adhesion. From the Nardin and Schultz equation, the experimental data obtained by local techniques such as AFM were found to be more realistic, in contrast, with those obtained from averaging techniques that are known to be not suited for heterogeneous samples such as flax fibres. The colloidal force microscopy was thus used to selectively measure all the possible. Interaction between the different polysaccharides of the fibres and the PLA matrix to qualitatively identity the weakest interaction system in a biocomposite. The results underline the important interactions of PLA matrix with both hemicellulose and pectin materials, even at low humidity rate. We postulated that the high water content of these two polysaccharides may be responsible for several mechanisms of interaction with PLA, such as hydrogen bonds, capillary forces or inter-diffusion processes. In parallel, adhesion force mapping of real raw and treated flax fibre’s surface by AFM force-volume technique give complementary results that underline an important adhesion with these two polysaccharides

Styles APA, Harvard, Vancouver, ISO, etc.

Park, Soo-Jin. « Etude énergétique de la surface des fibres de carbone ». Mulhouse, 1992. http://www.theses.fr/1992MULH0264.

Texte intégral

Résumé :

L'ensemble de ce travail est consacré à une étude systématique de l'utilisation de la chromatographie gazeuse inverse (CGI) pour la caractérisation de l'énergie de surface des fibres de carbone. Sont considérées notamment la CGI à dilution infinie et la CGI à dilution finie dans le cas de fibres de carbone modifiées, soit par un traitement d'oxydation anodique (réalisation au laboratoire), soit par divers traitements industriels. Pour chaque technique, les bases théoriques sont bien décrites et achèvent souvent des développements originaux, notamment pour la détermination de la distribution d'énergie des sites d'adsorption. En effet, la mesure des chaleurs isostériques d'adsorption met en évidence l'hétérogénéité de surface. Pour chaque type de traitement, on a pu montrer l'évolution des caractéristiques de surface, à savoir de l'enthalpie d'adsorption totale, et des enthalpies d'adsorption spécifiques acido-basiques, ainsi que, l'existence d'une bonne corrélation entre les enthalpies d'adsorption totales et les propriétés mécaniques du monofilament et des matériaux composites

Styles APA, Harvard, Vancouver, ISO, etc.

Yang, Hongta. « Fundamentals, preparation, and characterization of superhydrophobic wood fiber products ». Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24796.

Texte intégral

Résumé :

Thesis (M. S.)--Chemical Engineering, Georgia Institute of Technology, 2008.
Committee Chair: Yulin Deng; Committee Member: Jeffery S. Hsieh; Committee Member: Sujit Banerjee; Committee Member: Zhong Lin Wang.

Styles APA, Harvard, Vancouver, ISO, etc.

Briggert, Andreas. « Fibres orientation on sawn surfaces : Can fibre orientation on sawn surfaces be determined by means of high resolution scanning ». Thesis, Linnéuniversitetet, Institutionen för byggteknik (BY), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-34979.

Texte intégral

Résumé :

In 2013 the European journal of wood and wood products published an article regarding a new method to predict strength in structural timber (Olsson et al 2013). By determining the fibres orientation on all four surfaces of each board in sample of timber using a high resolution scanner the authors were able to achieve a coefficient of determination, R2, as high as 0.71 between bending strength and a new indicating property (IP). For the same sample of timber Olsson et al (2013) determined the R2 by axial dynamic excitation as 0.59. However, all boards used in their investigation were planed before scanning. This study examines if a high resolution scanner could be used to determine the fibre orientation on the surfaces of sawn timber boards of Norway spruce. Both band sawn surfaces and circular sawn surfaces were examined. The procedure in this investigation is described as follows. Firstly, both the band sawn and the circular sawn boards were scanned by a WoodEye® scanner and together with dimensions, weight and the first longitudinal resonance frequency, a modulus of elasticity (MOE) profile was calculated for each board. The MOE profiles were calculated according to Olsson et al (2013) i.e. by a transformation matrix based upon the fibres orientation and a compliance matrix based on material parameters for Norway spruce. Secondly, the corresponding MOE profiles were then determined after the boards had been planed. As a result two MOE profiles were determined for each board. An indicating property (IP) was defined as the lowest value along each MOE profile. To compare the results a regression analysis was performed in which the IPs defined before planing worked as predictor variable and IPs defined after planing worked as response variable. The band sawn band boards yielded an R2 = 0.94 and the circular sawn boards an R2 = 0.93. Further the standard error of estimate was SEE = 829.1 MPa and SEE = 640.9 MPa respectively. As a last step in this investigation the SEE values achieved in this study where implemented on to the sample Olsson et al (2013) used in their investigation.

Styles APA, Harvard, Vancouver, ISO, etc.

Feuillade, Vincent. « Etude de l'influence de la formulation de l'ensimage des fibres de verre sur la qualité de surface des composites SMC de type "classe A" ». Montpellier 2, 2003. http://www.theses.fr/2003MON20103.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Plus de sources

Livres sur le sujet "Fibred surface"

Powell, Peter C. Engineering with Fibre-Polymer Laminates. Dordrecht : Springer Netherlands, 1994.

Trouver le texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

T, Drzal Lawrence, et United States. National Aeronautics and Space Administration. Scientific and Technical Information Office., dir. The surface properties of carbon fibers and their adhesion to organic polymers. [Washington, DC] : National Aeronautics and Space Administration, Scientific and Technical Information Office, 1987.

Trouver le texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Sfiligoj Smole, Majda, Silvo Hribernik, Manja Kurečič, Andreja Urbanek Krajnc, Tatjana Kreže et Karin Stana Kleinschek. Surface Properties of Non-conventional Cellulose Fibres. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-10407-8.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Kostikov, V. I. Fibre Science and Technology. Dordrecht : Springer Netherlands, 1995.

Trouver le texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Starr, Trevor. Carbon and High Performance Fibres Directory and Databook. 6^e éd. Dordrecht : Springer Netherlands, 1995.

Trouver le texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Bjarklev, Anders. Photonic Crystal Fibres. Boston, MA : Springer US, 2003.

Trouver le texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Daisū kyokusensoku no chishigaku : Geography of Fibred Algebraic Surfaces. Tōkyō-to Bunkyō-ku : Uchida Rōkakuho, 2013.

Trouver le texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

D, Bascom Willard, et United States. National Aeronautics and Space Administration., dir. Surface and interfacial properties of carbon fibers. [Washington, DC : National Aeronautics and Space Administration, 1988.

Trouver le texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Dresselhaus, Mildred S. Graphite Fibers and Filaments. Berlin, Heidelberg : Springer Berlin Heidelberg, 1988.

Trouver le texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Li, Kecheng. The effect of fibre surface lignin on interfibre bonding. [St. John, NB] : University of New Brunswick, 2006.

Trouver le texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Plus de sources

Chapitres de livres sur le sujet "Fibred surface"

Laurikainen, Pekka, Sarianna Palola, Amaia De La Calle, Cristina Elizetxea, Sonia García-Arrieta et Essi Sarlin. « Fiber Resizing, Compounding and Validation ». Dans Systemic Circular Economy Solutions for Fiber Reinforced Composites, 125–40. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-22352-5_7.

Texte intégral

Résumé :

AbstractThe mechanical performance of a composite is greatly related to the load transfer capability of the interface between the matrix and the reinforcing fibers, i.e. the fiber/matrix adhesion, which is enhanced by a surface treatment called sizing. The original sizing of reinforcing fibers is removed during recycling process, which is recognized to contribute in typical issues of recycled fibers, namely uneven fiber properties and poor fiber/matrix adhesion. Applying a new sizing, a process denoted here as resizing, can help mitigate the issues. Furthermore, the sizing has a major role in improving the processability of the fibers as it contributes to the distribution of the fibers in the matrix. Proper distribution, along with the fiber fraction, are highly important for the composite performance. These properties are ensured by proper compounding. Here we demonstrate and validate the process steps to resize and compound recycled glass and carbon fibers with thermoplastic matrices. We found that at a relatively high sizing concentration, the compounding of all tested material combinations was possible. The resizing of the recycled fibers improved the compatibility at the fiber/matrix interface. It was concluded that recycled fibers can be used to replace virgin fibers in automotive industry to allow weight reductions and to promote circularity.

Styles APA, Harvard, Vancouver, ISO, etc.

Tao, Guangming, Ayman F. Abouraddy, Alexander M. Stolyarov et Yoel Fink. « Multimaterial Fibers ». Dans Springer Series in Surface Sciences, 1–26. Cham : Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-06998-2_1.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Ehrburger, P. « Surface Properties of Carbon Fibres ». Dans Carbon Fibers Filaments and Composites, 147–61. Dordrecht : Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-015-6847-0_6.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Netravali, Anil N. « Laser Surface Modification of Fibers for Improving Fiber/Resin Interfacial Interactions in Composites ». Dans Laser Surface Modification and Adhesion, 139–66. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118831670.ch4.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Park, Soo-Jin, et Long-Yue Meng. « Surface Treatment and Sizing of Carbon Fibers ». Dans Carbon Fibers, 101–33. Dordrecht : Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-017-9478-7_4.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Park, Soo-Jin. « Surface Treatment and Sizing of Carbon Fibers ». Dans Carbon Fibers, 105–37. Singapore : Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0538-2_4.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Baffour-Awuah, E., S. A. Akinlabi, T. C. Jen et E. T. Akinlabi. « Surface Modification of Vegetal Fibre ». Dans Sustainable Education and Development – Making Cities and Human Settlements Inclusive, Safe, Resilient, and Sustainable, 206–16. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-90973-4_17.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Kerkstra, Randy, et Steve Brammer. « Glass Fibers on Surface ». Dans Injection Molding Advanced Troubleshooting Guide, 309–17. München : Carl Hanser Verlag GmbH & Co. KG, 2018. http://dx.doi.org/10.3139/9781569906460.032.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Kerkstra, Randy, et Steve Brammer. « Glass Fibers on Surface ». Dans Injection Molding Advanced Troubleshooting Guide, 319–27. 2^e éd. München : Carl Hanser Verlag GmbH & Co. KG, 2021. http://dx.doi.org/10.3139/9781569908358.032.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Belgacem, Mohamed Naceur, et Julien Bras. « Surface Treatments of Paper ». Dans Lignocellulosic Fibers and Wood Handbook, 481–92. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781118773727.ch19.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Actes de conférences sur le sujet "Fibred surface"

Malkapuram, devaiah. « Thermal Properties of Hybrid Natural Fiber Reinforced Polymer Matrix Composites with SiC as Filler ». Dans International Conference on Advances in Design, Materials, Manufacturing and Surface Engineering for Mobility. 400 Commonwealth Drive, Warrendale, PA, United States : SAE International, 2020. http://dx.doi.org/10.4271/2020-28-0460.

Texte intégral

Résumé :

<div class="section abstract"><div class="htmlview paragraph">Scientists and technologists attracted towards natural fibers like banana, cotton, coir, sisal, hemp and jute for the application civil structures and consumer goods. It was identified the electrical resistance, thermal and acoustic insulating properties for possessing of these natural fibers in composites. Natural fibers have many benefits compared to artificial fibers, as an example less density, less weight; low cost, specific properties and they are recyclable and biodegradable. There aren’t any skin effects because of high strength and stiffness, renewable. In alternative manner, there also are some limitations, as an example less thermal stability and wetness uptake. several of them studied a major improvement in properties of hybrid composites with reinforced with glass fiber in resin content however it’s naturally hazard with usage of this glass fiber content. There are many publications on review of fiber reinforced composites, a notable research has been done on natural fiber polymer composites but research on jute, hemp, hybrid of jute fiber and hemp fiber, hybrid (jute/hemp) fiber with SiC particulates as filler at specific extent fractions primarily.</div><div class="htmlview paragraph">In this paper, hybrid (hemp and jute) fiber reinforced epoxy matrix composites were fabricated by using hand lay-up technique of different weight percentage of hybrid fiber and SiC particulates as filler have been studied and their thermal properties such as density, Thermal gravimetric analysis (TGA) and Differential Scanning Calorimetry (DSC) by which we can know thermal stability of the composites.</div></div>

Styles APA, Harvard, Vancouver, ISO, etc.

Fisher, M. A., Y. Z. Huang, A. J. Dann, D. J. Elton, M. J. Harlow, S. D. Perrin, J. Reed, I. Reid, H. J. Wickes et M. J. Adams. « 1.5 μm Vertical-Cavity Surface-Emitting Lasers ». Dans Semiconductor Lasers : Advanced Devices and Applications. Washington, D.C. : Optica Publishing Group, 1995. http://dx.doi.org/10.1364/slada.1995.tud.2.

Texte intégral

Résumé :

VCSELs emitting in the 1.3 and 1.55 μm regions could be particularly useful as low cost sources for optical fibre telecommunications applications because mode-matched devices can be coupled to single-mode fibres with high efficiency and good alignment tolerance. The absence of cleaved facets also permits on-wafer characterisation of devices.

Styles APA, Harvard, Vancouver, ISO, etc.

Ajouguim, Soukaina, Jonathan Page, Chafika Djelal, Mohamed Waqif et Latifa Saadi. « Performance of Alfa Fibres in Cementitious Materials Exposed to Diverse Surface Treatments ». Dans 4th International Conference on Bio-Based Building Materials. Switzerland : Trans Tech Publications Ltd, 2022. http://dx.doi.org/10.4028/www.scientific.net/cta.1.660.

Texte intégral

Résumé :

Alfa plant presents a great ecological and socio-economic interest in the Maghreb countries. It is used in several fields of applications such as craft production and paper industry. However, a few research work has been realized on the valorisation of Alfa fibres in the construction sector. The main objective of this work is to develop an Alfa fibre-reinforced mortar with significant mechanical properties for the facade panel’s manufacturing. It was highlighted that Alfa fibres enhance the flexural strength of reinforced mortars. Therefore, a decrease in the flexural strength of the composite after 90 days of curing. In addition, the incorporation of Alfa fibres reduced the compressive strength of the composite. In this regard, to enhance the mechanical properties of the composite, various treatments were explored: alkaline treatment with sodium hydroxide, hydrothermal treatment by water boiling, and coating with sulfoaluminate cement. It was noted that the treatments could provide a partial elimination of the non-cellulosic components and enhance the Alfa fibre roughness. Raw and treated Alfa fibres were incorporated into cement mortars at different lengths of the (10 and 20 mm) with an addition ratio of 1 %vol.. Compared to untreated fibres, fibres treated chemically provide an improvement of 38 % of the flexural strength at 28 days for both fibres length. Unlike the coated fibres, the efficiency of treatment was noted at 90 days of curing. Otherwise, a slight increase in compressive strength was observed compared to the untreated fibres mortar. These results were approved by porosity accessible to water and calorimetric tests.

Styles APA, Harvard, Vancouver, ISO, etc.

Walkingshaw, Jason, Stephen Spence, Jan Ehrhard et David Thornhill. « An Investigation Into Improving Off-Design Performance in a Turbocharger Turbine Utilizing Non-Radial Blading ». Dans ASME 2011 Turbo Expo : Turbine Technical Conference and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/gt2011-45717.

Texte intégral

Résumé :

Off-design performance now plays a vital role in the design decisions made for automotive turbocharger turbines. Of particular interest is extracting more energy at high pressure ratios and lower rotational speeds. In this region of operation the U/C value will be low and the rotor will experience high values of positive incidence at the inlet. The positive incidence causes flow to separate on the suction surface and produces high blade loading at inlet, which drives tip leakage. A CFD analysis has been carried out on a number of automotive turbines utilizing non-radial fibred blading. To help improve secondary flows yet meet stress requirements a number of designs have been investigated. The inlet blade angle has been modified in a number of ways. Firstly, the blading has been adjusted as to provide a constant back swept angle in the span wise direction. Using the results of the constant back swept blading studies, the back swept blade angle was then varied in the span wise direction. In addition to this, in an attempt to avoid an increase in stress, the effect of varying the leading edge profile of the blade was investigated. It has been seen that off-design performance is improved by implementing back swept blading at the inlet. Varying the inlet angle in the span wise direction provided more freedom for meeting stress requirements and reduces the negative impact on blade performance at the design point. The blade leading edge profile was seen to offer small improvements during off-design operation with minimal effects on stress within the rotor. However, due to the more pointed nature of the leading edge, the rotor was less tolerant to flow misalignment at the design point.

Styles APA, Harvard, Vancouver, ISO, etc.

Procházka, P. « Optimal shape of fibers in composite structure using Inverse variational principles ». Dans CONTACT/SURFACE 2007. Southampton, UK : WIT Press, 2007. http://dx.doi.org/10.2495/secm070131.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

ASEER, J. RONALD, Renold Elsen et MOHAMMED RILWAN. « Finite Element Modeling of Elastic Properties of Flax Fiber Reinforced Epoxy Composites ». Dans International Conference on Advances in Design, Materials, Manufacturing and Surface Engineering for Mobility. 400 Commonwealth Drive, Warrendale, PA, United States : SAE International, 2020. http://dx.doi.org/10.4271/2020-28-0489.

Texte intégral

Résumé :

<div class="section abstract"><div class="htmlview paragraph">Natural fibers are extracted from plant can be used as a fiber reinforcement in polymer based materials which provides anisotropic mechanical properties due to their interior microstructure. In our county, flax fiber is available in nature abundantly which is widely used for manufacturing of composites for automotive and aerospace application. In these work, young modulus of fiber composites is determined by using mathematical models. Finite element model is used to determine the modulus properties of flax fiber epoxy composites by varying fiber ratio. The analysis results indicated that finite element model results are correlated with mathematical of flax fiber reinforced epoxy composites.</div></div>

Styles APA, Harvard, Vancouver, ISO, etc.

LILLI, MATTEO, MILAN ZVONEK, VLADIMIR CECH, CHRISTINA SCHEFFLER, JACOPO TIRILLÒ et FABRIZIO SARASINI. « PLASMA POLYMERIZATION ON UNSIZED BASALT FIBRES FOR IMPROVING THE INTERFACIAL STRENGTH WITH POLYMER MATRICES ». Dans Thirty-sixth Technical Conference. Destech Publications, Inc., 2021. http://dx.doi.org/10.12783/asc36/35903.

Texte intégral

Résumé :

Basalt fibres are becoming a promising alternative to synthetic fibres as a green reinforcement phase in polymeric matrix composites, showing excellent mechanical, chemical and thermal properties. In this work we synthetized tetravinylsilane (TVS) or a mixture formed by tetravinylsilane and different percentages of oxygen on the surface of unsized basalt fibres through the Plasma-Enhanced Chemical Vapor Deposition (PECVD) technique for improving the fibre/matrix adhesion. Single fibre tensile test proved the effectiveness of the process, without any degradation of the mechanical properties of modified basalt fibres. Finally, through pull out tests, the interfacial properties of basalt fibres were studied, measuring increases up to 80% of the IFSS for modified fibres compared to neat fibres. This result is the consequence of a greater chemical compatibility between the fibres and the matrix, thanks to the presence of a higher number of Si-O-C groups, and of a mechanical interlocking effect promoted by the increased surface roughness of the plasma-modified fibres.

Styles APA, Harvard, Vancouver, ISO, etc.

Singh, Amit V. « Investigation of Airy Surface Plasmon Polariton evolution on metallic surfaces by Photoemission Electron Microscopy ». Dans International Conference on Fibre Optics and Photonics. Washington, D.C. : OSA, 2016. http://dx.doi.org/10.1364/photonics.2016.tu4a.14.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Rajkumar, N., J. N. McMullin, B. P. Keyworth et R. I. MacDonald. « 3 X 3 Optoelectronic Cross-Bar Switch Using Vertical Cavity Surface Emitting Laser Arrays ». Dans Diffractive Optics and Micro-Optics. Washington, D.C. : Optica Publishing Group, 1996. http://dx.doi.org/10.1364/domo.1996.dmd.4.

Texte intégral

Résumé :

In an electronic space division switch matrix, the system performance at high frequencies is subject to degradation because of crosstalk due to electromagnetic coupling in adjacent signal paths. A substantial improvement in performance can be obtained if the incoming signals were optical and the outgoing electrical with optical detectors acting as the cross points[1,2]. As the incoming paths are optical, a great degree of immunity to crosstalk can be gained, and the crosstalk that may arise in the outgoing electrical lines could be reduced by proper shielding as the adjacent conductor lines are no longer electrically connected. Such switching matrices may also be applied in high speed analog and digital signal processing applications [3,4]. The signal distribution in optoelectronic switches has been done in the past using 1:N multimode fibre splitters and butt-coupling the fibres to the MSM detectors by prealigning the fibres in etched silicon V-groove arrays. Two drawbacks of the fibre distribution method are that it is very fragile and handling large number of fibres is difficult and time-consuming. Alternative approaches are the use of integrated waveguide devices for power division or free space interconnect. A 3X3 free space switch prototype using three discrete lasers has been previously reported [5]. In this paper a modified version using vertical cavity surface emitting lasers (VCSEL’s) driven by electrical inputs is described.

Styles APA, Harvard, Vancouver, ISO, etc.

Sinclair, A. G., I. S. Ruddock et R. Illingworth. « Optical Assessment of Single Crystal Fibres ». Dans Nonlinear Optics. Washington, D.C. : Optica Publishing Group, 1992. http://dx.doi.org/10.1364/nlo.1992.we9.

Texte intégral

Résumé :

Single crystal fibres are grown by the Laser Heated Miniature Pedestal Growth technique [1] in lengths of up to ~ 50mm and with diameters in the range 50-500 μm. By this method, doped fibres, for example Cr3+ and Ti3+ in sapphire (alumina) for use in solid-state lasers or fibres of various nonlinear crystals may be produced. For laser action to be possible or for a fibre to be used in an optoelectronic device, there are several requirements to be met:- (i) the fibre diameter and cross-section must be uniform, (ii) the direction of the optic axis in an anisotropic crystal should be known, (iii) the fibre ends should be flat and preferably normal to the fibre axis, (iv) the fibre surface should be smooth so as to minimise scattering losses, and (v) for a fibre to be incorporated into a laser cavity a polarised Gaussian beam entering the fibre at one end must emerge from the other as a Gaussian beam of a known state of polarisation.

Styles APA, Harvard, Vancouver, ISO, etc.

Rapports d'organisations sur le sujet "Fibred surface"

Spiegel, Yitzhak, Michael McClure, Itzhak Kahane et B. M. Zuckerman. Characterization of the Phytophagous Nematode Surface Coat to Provide New Strategies for Biocontrol. United States Department of Agriculture, novembre 1995. http://dx.doi.org/10.32747/1995.7613015.bard.

Texte intégral

Résumé :

Chemical composition and biological role of the surface coat (SC) of the root-knot nematodes, Meloidogyne spp. are described. SC proteins of M. incognita race 3 infective juveniles (J2) were characterized by electrophoresis and western blotting of extracts from radioiodine and biotin-labelled nematodes. J2 labelled with radioiodine and biotin released 125I and biotin-labelled molecules into water after 20 hours incubation, indicating that SC proteins may be loosely attached to the nematode. Antiserum to the principal protein reacted with the surface of live J2 and with surface proteins previously separated by electrophoresis. Human red blood cells (HRBC) adhered to J2 of several tylenchid nematodes over the entire nematode body. HRBC adhered also to nylon fibers coated with SC extracted from M. javanica J2; binding was Ca++/Mg++ dependent, and decreased when the nylon fibers were coated with bovine serum albumin, or pre-incubated with fucose and mannose. These experiments support a working hypothesis that RBC adhesion involves carbohydrate moieties of HRBC and carbohydrate-recognition domain(s) (CRD) distributed on the nematode surface. To our knowledge, this is the first report of a surface CRD i the phylum Nematoda. Gold-conjugated lectins and neoglycoproteins combined with silver enhancement have been used for the detection of carbohydrates and CRD, respectively, on the SC of M. javanica J2. Biotin reagents were used to trace surface proteins, specifically, on live J2. The labile and transitory nature of the SC was demonstrated by the dynamics of HRBC adherence to detergent-treated J2, J2 at different ages or fresh-hatched J2 held at various temperatures. SC recovery was demonstrated also by a SDS-PAGE profile. Monoclonal antibodies developed to a cuticular protein of M. incognita J2 gave a slight, but significant reduction in attachment of Pasteuria penetrans spores. Spore attachment as affected by several enzymes was inconsistent: alcian blue, which specifically blocks sulfyl groups, had no afffect on spore attachment. Treatment with cationized ferritin alone or catonized ferritin following monoclonal antibody caused significant decreases in spore attachment. Those results suggest a role in attachment by negatively charged groups.

Styles APA, Harvard, Vancouver, ISO, etc.

Jones, Carol, et Ernest Sammann. The Effect of Low Power Plasmas on Carbon Fibre Surfaces. Fort Belvoir, VA : Defense Technical Information Center, octobre 1989. http://dx.doi.org/10.21236/ada234184.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Ishida, Hatsuo, et Philippe Bussi. Surface Induced Crystallization in Fiber Reinforced Semicrystalline Thermoplastics Composites. Fort Belvoir, VA : Defense Technical Information Center, mars 1991. http://dx.doi.org/10.21236/ada236591.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Thornberg, Steven Michael, Michael I. White, Arthur Norman Rumpf et Kent Bryant Pfeifer. Surface plasmon sensing of gas phase contaminants using optical fiber. Office of Scientific and Technical Information (OSTI), octobre 2009. http://dx.doi.org/10.2172/973354.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Paulauskas, Felix, Joshua Nowak, David Martin et Truman Bonds. CRADA (NFE-17-06574) Final Report : Carbon Fiber Surface Treatment. Office of Scientific and Technical Information (OSTI), janvier 2023. http://dx.doi.org/10.2172/1922292.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Anderton, Gary, Ernest Berney, John Newman, Travis Mann, Chad Gartrell et Daniel Miller. Joint Rapid Airfield Construction (JRAC) Program 2004 Demonstration Project--Fort Bragg, North Carolina. Engineer Research and Development Center (U.S.), mars 2021. http://dx.doi.org/10.21079/11681/40139.

Texte intégral

Résumé :

This report describes the demonstration of technologies and procedures developed during April 2002 and May 2004 under the Joint Rapid Airfield Construction (JRAC) Program. The demonstration took place at Sicily Landing Zone (LZ) at Fort Bragg, NC, in July of 2004. The objective of the exercise was to demonstrate the procedures and technologies developed under the JRAC Program by rapidly building two parking aprons capable of supporting C-130 transport aircraft taxiing and parking operations. The exercise was conducted under continuous 24-hr operations to simulate a real-world rapid construction environment. Apron 1 (north apron) was constructed using two technologies, one-half being ACE™ Matting and the other half being a cement-polymer stabilized soil surface. Apron 2 (south apron) was constructed solely of a fiber-cement-stabilized soil system. Both aprons were treated with a polymer emulsion surface application to form a sealed surface against abrasion and water infiltration. The entire construction of both aprons required 76 hr, with Apron 1 finished in 48 hr. The construction of Apron 1 was validated by operation of a C-130 aircraft approximately 31 hr after completion with success and high praises from the aircraft flight crew on the stability and surface of the apron, as well as its dust-abating characteristics.

Styles APA, Harvard, Vancouver, ISO, etc.

Laufenberg, Theodore, Andrzej Krzysik et Jerrold Winandy. Improving engineered wood fiber surfaces for accessible playgrounds. Madison, WI : U.S. Department of Agriculture, Forest Service, Forest Products Laboratory, 2003. http://dx.doi.org/10.2737/fpl-gtr-135.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Charles A. Gentile, John J. Parker et Stewart J. Zweben. In-Situ Imaging and Quantification of Tritium Surface Contamination via Coherent Fiber Bundle. Office of Scientific and Technical Information (OSTI), novembre 2001. http://dx.doi.org/10.2172/792584.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Bell, Nelson Simmons, Nancy A. Missert, Kevin Leung, Susan L. Rempe, David R. Rogers, Mani Nagasubramanian, Karen Lozano et Yatinkumar Rane. Surface engineering of electrospun fibers to optimize ion and electron transport in Li%2B battery cathodes. Office of Scientific and Technical Information (OSTI), novembre 2012. http://dx.doi.org/10.2172/1055879.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Laufenberg, Theodore L., et Jerrold E. Winandy. Field performance testing of improved engineered wood fiber surfaces for accessible playground areas. Madison, WI : U.S. Department of Agriculture, Forest Service, Forest Products Laboratory, 2003. http://dx.doi.org/10.2737/fpl-gtr-138.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Nous offrons des réductions sur tous les plans premium pour les auteurs dont les œuvres sont incluses dans des sélections littéraires thématiques. Contactez-nous pour obtenir un code promo unique!