Bibliografías temáticas / Fibre

Literatura académica sobre el tema "Fibre"

Autor: Grafiati
Publicado: 4 de junio de 2021
Última modificación: 18 de mayo de 2024

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Artículos de revistas sobre el tema "Fibre"

1

Hasham, Md, V. Reddy Srinivasa, M. V. Seshagiri Rao y S. Shrihari. "Flexural behaviour of basalt fibred concrete slabs made with basalt fibre reinforced polymer rebars". E3S Web of Conferences 309 (2021): 01055. http://dx.doi.org/10.1051/e3sconf/202130901055.

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In this paper, the flexural behaviour of M30 grade basalt fibred concrete slabs made with basalt fibre reinforced polymer rebars are studied and compared with slabs made with steel rebars. The optimum percentage of basalt is 0.3% for 50mm length basalt fibres. Due to high particle packing density in concrete made with basalt fibre micro cracks are prevented due to enhanced fatigue and stress dissipation capacity. Addition of basalt fibres to enhances the energy absorbtion capacity or toughness thereby enhancing the resistance to local damage and spalling. Addition of basalt fibres controlled the crack growth and crack width. Load at first crack of M30 grade basalt fibred concrete slabs made with basalt fibre reinforced polymer rebars is more than M30 grade conventional concrete slabs made with steel rebars because the with addition of basalt and BFRP bars will make either the interfacial transition zone (ITZ) strong or due to bond strength of concrete slabs made with basalt fibre reinforced polymer rebars. The ultimate strength in M30 grade basalt fibred concrete slabs made with basalt fibre reinforced polymer rebars is more than conventional concrete slabs made with steel rebars. Deflection at the centre of M30 grade basalt fibred concrete slabs made with basalt fibre reinforced polymer rebars is almost double than the conventional concrete slabs made with steel rebars. Toughness indices evaluated for M30 grade basalt fibred concrete slabs made with basalt fibre reinforced polymer rebars indicates that basalt fibre and BFRP bars will enhance the energy absorbtion capacity of slabs.
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2

Parasakthibala, Ms G. y Mrs A. S. Monisha. "A Review on Natural Fibers; Its Properties and Application Over Synthetic Fibers". International Journal for Research in Applied Science and Engineering Technology 10, n.º 8 (31 de agosto de 2022): 1894–97. http://dx.doi.org/10.22214/ijraset.2022.46530.

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Abstract: Fibre is a long, thin strand or thread of material made by weaving or knitting threads together. Fibre is a hair like strand of material. A fibre is the smallest visible unit of any textile product. Fibres are flexible and may be spun into yarn and made into fabric. Natural fibres are taken from animals, vegetables or mineral sources. A few examples of widely used natural fibres include animal fibre such as wool and silk vegetables fibres, especially cotton and flax and asbestos, a mineral. Natural fibers are more important part in our human environment. Natural fibers are ecofriendly and inexpensive which are readily available in nature. In this chapter we discuss about the overview of natural fiber and their characteristic. this paper also deals with the impact of natural fibers over the synthetic fibers and also the application of natural fiber in various fields.
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3

Amir, Norlaili, Faiz Ahmad y Puteri S. M. Megat Yusoff. "Char Strength of Wool Fibre Reinforced Epoxy-Based Intumescent Coatings (FRIC)". Advanced Materials Research 626 (diciembre de 2012): 504–8. http://dx.doi.org/10.4028/www.scientific.net/amr.626.504.

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Fire protective intumescent coating cannot insulate a base material effectively if its char lacks mechanical strength. This research therefore, studied the effects of fibre reinforcement to epoxy-based intumescent coatings char strength. The fibres used include glass wool fibre, Rockwool fibre and ceramic wool fibre of 10mm length. The three formulations mechanical performances were compared to both, a famous commercial intumescent coating and a control formulation without fibre. These coatings were fire tested up to 800°C in an electric furnace for an hour. Their chars mechanical properties were evaluated for char resistance test using predetermined weight loads. In the test, masses from 100g to 3600g were loaded continuously on top of the chars where the fibre reinforced intumescent coating (FRIC) has shown better strength and resistance to deformation. As a result, they produced lower percentage of height reduction i.e. 34% - 83% different when compared to unreinforced coating. Control char also ruptured at as low as 4N load. It was deduced that fire insulative wool fibres are effective reinforcement for improved char strength of the FRIC.
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4

Katarpawar, Raghvendra. "Review on Strengthening the Characteristics of Concrete Using Oil Coated Coconut Fibre". International Journal for Research in Applied Science and Engineering Technology 9, n.º VI (30 de junio de 2021): 3844–50. http://dx.doi.org/10.22214/ijraset.2021.35954.

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Sustainability is a widely acknowledged concept in modern day construction scenario. Although the construction industry is transforming in a substantial way in terms of the material used and the equipment used, the construction cost has risen steeply along with the worse impact on the environment due to this it has resulted in the acceptance of method like the use of natural fiber for example Coconut fibre for improving the strength of concrete. Coconut fiber is easily and widely available in abundance, which makes it fairly sustainable as form of reinforcement material in concrete. The use of coconut fibre as in form of reinforcement has also emerged as new source of income for the coconut producer. In addition, it can also be seen as a new effective way for the discarding of coir mattress wastage. The major problem of coconut fibre i.e. high water absorption rate of the fibre can be reduced to certain extent by coating the fibres with appropriate oil. In addition to this, the fibres which are naturally occurring is also ecologically sustainable and can lower the global carbon track effectively. This study aims to analyse the difference in strength of coconut fibre (processed fibres coated with oil and oil raw fibres coated with oil) reinforced concrete at various fibre contents and to collate it with the traditional concrete. The different strength aspects which are analysed in this study are the tensile, compressive and flexural strength of the concrete reinforced with coconut fibre at different percentages like 4%, 5% & 6% by the weight of cement of fibre. The optimum percentage of the raw fibre meshes and processed fibre were found and the optimum percentage of super-plasticizer required for the desired workability was also examined.
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Ortega, Raquel, Mario D. Monzón, Zaida C. Ortega y Eoin Cunningham. "Study and fire test of banana fibre reinforced composites with flame retardance properties". Open Chemistry 18, n.º 1 (7 de abril de 2020): 275–86. http://dx.doi.org/10.1515/chem-2020-0025.

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AbstractThe interest in natural fibre reinforced composites is growing in industrial applications due to natural fibres being an attractive alternative to synthetic fibres. However, it is necessary to improve the fire behaviour of the material because natural fibres have a high combustibility. The objective of this work is to evaluate the fire resistance of polymer composites reinforced with natural fibre fabric, using magnesium hydroxide as flame retardant for the polymeric matrix and alkali treatment for the fibre. The types of fabric are banana, banana with cotton and linen; and long banana fibre has been used for the formation of a nonwoven. The fire test is carried out based on ISO 9773 standard and the effect of the additive has been studied, chemical treatment, type of fabric and number of layers. Through statistical analysis, it is concluded that the flame propagation speed has a decreasing relation with respect to the percentage, but it decreases the mechanical properties considerably. In addition, the number of layers and type of fabric influence the fire properties. Finally, it is concluded that composites reinforced with linen fabric have the best mechanical properties, but banana nonwoven with 60% additive has the best fire behaviour.
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6

Ghazzawi, Yousof M., Andres F. Osorio y Michael T. Heitzmann. "Fire performance of continuous glass fibre reinforced polycarbonate composites: The effect of fibre architecture on the fire properties of polycarbonate composites". Journal of Composite Materials 53, n.º 12 (23 de octubre de 2018): 1705–15. http://dx.doi.org/10.1177/0021998318808052.

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The fire performance of polycarbonate resin and the role of glass fibre reinforcement in altering the fire performance was investigated. Three different fibre weaves with comparable surface density, plain, twill, and unidirectional glass fabrics, were used as reinforcements. E-glass fabrics were solution-impregnated with polycarbonate/dichloromethyl, laid up, and compression-moulded to consolidate the glass fibre reinforced polycarbonate composite. Cone calorimetry tests with an incident radiant flux of 35 kW/m2 were used to investigate the fire properties of polycarbonate resin and its composites. Results showed that glass fibre reinforcement improves polycarbonate performance by delaying its ignition, decreasing its heat release rate, and lowering the mass loss rate. The three fibre weave types exhibited similar time to ignition. However, unidirectional fibre had a 35% lower peak heat release rate followed when compared to plain and twill weave fibres.
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7

Uwaremhevho Momodu, Daniel. "SURFACE FUNCTIONALIZATION OF LINEN FIBER AND ITS DYE-FASTNESS ASSESSMENT USING (4-[(E)-(4-AMINO-2-HYDROXYPHENYL) DIAZENYL] BENZENE- 1-SULPHONIC ACID AND 4-[(E)-(4-{(Z)-[4-(DIMETHYLAMINO) PHENYL] DIAZENYL}-2-HYDROXYPHENYL) DIAZENYL] BENZENE-1-SULPHONIC ACI". Suranaree Journal of Science and Technology 30, n.º 3 (14 de diciembre de 2023): 030118(1–9). http://dx.doi.org/10.55766/sujst-2023-03-e03039.

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Textile fibres find application in many fields, such as; Apparel manufacturing, Medical, Agriculture, Packaging, Civil construction, Shipping. Some of these fibres lack special characteristics required for some specific application without any additional treatment. Large scale production of linen fibre has been limited by the tendency of the fibre to absorb water, degradation by micro-organisms and sunlight. These factors ultimately lower the strength and the service life of the fibre. Hence, the need to improve the hydrophobicity of natural linen fibre before application. Poor dye-fibre interaction has been an area of constant interest in the textile industry. This has been expressed by bleeding, crocking, bleaching of fabric resulting to fading of the fabric. These shortcomings are sometimes due to poor treatment, manufacturing processes and customer handling. Natural linen fiber is an eco-friendly ligno-cellulosic fiber known for its strength, resistance to degradation, hydrophobicity when pointedly modified. In this research, chemical modification of scoured and bleached linen fibre by Acetylation, Methylation and Benzoylation was carried out. The chemically modified fibres were evaluated by techniques such as SEM and FTIR spectroscopy. The mechanical property (strength) was determined after each modification. The result obtained revealed an absorption band at 3432 cm-1 - 3450 cm-1 confirming the OH group in the linen fibre. The band at 704 cm-1 indicated the presence of a benzene ring from benzoyl chloride. The chemical modification changed the morphology of the linen fibre for improved dye–fibre interaction. The chemically modified species were dyed and further subjected to a dye fastness test. The results revealed at 4.33a ± 0.69, 5.00a ± 0.00 and 4.67a ± 0.58 as against3.00a±1.00, 3.33a±0.58 and 2.67a±0.58 for light fastness, wash fastness and rub fastness respectively when subjected to ANOVA analysis. In conclusion, benzoylated linen fibre was observed to most improved dye-fibre interaction.
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8

Xiao, Jie, Han Shi, Lei Tao, Liangliang Qi, Wei Min, Hui Zhang, Muhuo Yu y Zeyu Sun. "Effect of Fibres on the Failure Mechanism of Composite Tubes under Low-Velocity Impact". Materials 13, n.º 18 (17 de septiembre de 2020): 4143. http://dx.doi.org/10.3390/ma13184143.

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Filament-wound composite tubular structures are frequently used in transmission systems, pressure vessels, and sports equipment. In this study, the failure mechanism of composite tubes reinforced with different fibres under low-velocity impact (LVI) and the radial residual compression performance of the impacted composite tubes were investigated. Four fibres, including carbon fiber-T800, carbon fiber-T700, basalt fibre, and glass fibre, were used to fabricate the composite tubes by the winding process. The internal matrix/fibre interface of the composite tubes before the LVI and their failure mechanism after the LVI were investigated by scanning electric microscopy and X-ray micro-computed tomography, respectively. The results showed that the composite tubes mainly fractured through the delamination and fibre breakage damage under the impact of 15 J energy. Delamination and localized fibre breakage occur in the glass fibre-reinforced composite (GFRP) and basalt fibre-reinforced composite (BFRP) tubes when subjected to LVI. While fibre breakage damage occurs globally in the carbon fibre-reinforced composite (CFRP) tubes. The GFRP tube showed the best impact resistance among all the tubes investigated. The basalt fibre-reinforced composite (BFRP) tube exhibited the lowest structural impact resistance. The impact resistance of the CFRP-T700 and CFRP-T800 tube differed slightly. The radial residual compression strength (R-RCS) of the BFRP tube is not sensitive to the impact, while that of the GFRP tube is shown to be highly sensitive to the impact.
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9

Mathew, Merin, Kamalakanth Shenoy y Ravishankar K. S. "Evaluation of Porosity and Water Sorption in Conventionally Cured Modified Polymethyl Methacrylate Resin - An In Vitro Study". Journal of Evolution of Medical and Dental Sciences 10, n.º 13 (29 de marzo de 2021): 930–34. http://dx.doi.org/10.14260/jemds/2021/201.

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BACKGROUND Dimensional change and porosity in the polymethylmethacrylate based prosthesis affects its clinical performance. Hence, the present study aimed to evaluate the porosity and water sorption present in the modified polymethyl methacrylate polymer composite. METHODS Control group without fibre reinforcement and test groups with fibre reinforcement were prepared for the study. Three different fibres such as boron free-E glass fibre, untreated and plasma-treated polypropylene fibres in varying weight percentage and aspect ratio were considered for reinforcement. The porosity of the fractured surface was observed through a scanning electron microscope (scanning electron microscope) and sorption measured based on international standards organization (ISO) 1567:1999. RESULTS Control group exhibited porous structures, whereas all fibre-reinforced groups did not exhibit porous structure at the fracture surface. There was a significant difference in the sorption rate between control and test group (p < 0.001). Among fibrereinforced test groups, boron free E glass fibre reinforced polymethylmethacrylate exhibited maximum sorption followed by polypropylene fibre reinforced polymer test groups (p < 0.001). However, all samples showed sorption rate within the ISO specification. CONCLUSIONS Fiber reinforcement is an effective method to reduce porosity and water sorption in polymethylmethacrylate based polymer composite regardless of the fibre type. KEY WORDS Polymer Composite, Porosity, Water Sorption, Fiber Reinforcement, Polymethylmethacrylate
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10

Schabowicz, Krzysztof, Tomasz Gorzelańczyk y Mateusz Szymków. "Identification of the Degree of Degradation of Fibre-Cement Boards Exposed to Fire by Means of the Acoustic Emission Method and Artificial Neural Networks". Materials 12, n.º 4 (21 de febrero de 2019): 656. http://dx.doi.org/10.3390/ma12040656.

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This paper presents the results of research aimed at identifying the degree of degradation of fibre-cement boards exposed to fire. The fibre-cement board samples were initially exposed to fire at various durations in the range of 1–15 min. The samples were then subjected to three-point bending and were investigated using the acoustic emission method. Artificial neural networks (ANNs) were employed to analyse the results yielded by the acoustic emission method. Fire was found to have a degrading effect on the fibres contained in the boards. As the length of exposure to fire increased, the fibres underwent gradual degradation, which was reflected in a decrease in the number of acoustic emission (AE) events recognised by the artificial neural networks as accompanying the breaking of the fibres during the three-point bending of the sample. It was shown that it is not sufficient to determine the degree of degradation of fibre-cement boards solely on the basis of bending strength (MOR).
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Tesis sobre el tema "Fibre"

1

Goh, Kheng Lim. "Fibre reinforcement in fibre composite materials : effect of fibre shape". Thesis, University of Aberdeen, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.395069.

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The aim of this project was to investigate the effects of fibre shape on its ability to reinforce a fibre composite material. Analytical and finite element (FE) models of an axisymmetric fibre composite material were developed and used to achieve this aim. Fibres of cylindrical shape, ellipsoidal shape, with paraboloidal ends and with conical ends were considered: fibre geometry was further characterised by an axial ratio, q. The scope of this study covered elastic and plastic load transfer processes. The former corresponds to the initial loading stage whereby an applied tensile stress acting on a fibre composite causes stress in an elastic matrix to be transferred to an elastic fibre which is embedded in and adheres to the matrix. The latter corresponds to the next stage when, on progressive increase of the applied stress, the matrix yields and turns plastic and failure of adhesion at the fibre-matrix interface occurs. Two approaches were used to develop analytical models. In the first approach, equations were derived for calculating stress and displacement distributions in a general axisymmetric body. This approach was based on a stress function method for structural analysis of a statically indeterminate problem. The equations derived were implemented to model a fibre composite undergoing elastic load transfer by prescribing appropriate boundary conditions. However, the approach led to no useful solutions. In the second approach, first-order ordinary differential equations for solving axial, σz, and surface radial, σr, stresses in a fibre were formulated by considering forces at equilibrium in a stress element in a fibre subjected to a fibre-matrix interfacial stress. Equations for calculating these stresses to study plastic load transfer were derived from the differential equations by prescribing appropriate boundary conditions, σz was assumed to be constant in the radical direction of the fibre. For a cylindrical fibre, σz increases linearly, from zero at the ends, to a maximum value at the centre. At the other extreme, σz in a conical fibre was shown to be constant. The intermediate cases of a paraboloidal and an ellipsoidal fibre showed distribution of σz lying between these two extremes. The effectiveness of a fibre shape for reinforcement was defined for the plastic study. It was found that the conical fibre possessed the highest value; the cylindrical fibre gave the lowest value. From this study, it was concluded that: (1) an important property of all the tapers considered is to make the distribution of σz in a fibre more uniform; (2) fibres with conical ends are more effective for reinforcing fibre composite materials than cylindrical fibres.
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2

David, Marie. "Optimisation de la dispersion des fibres pendant le cycle de malaxage des bétons industriels". Thesis, Paris Est, 2014. http://www.theses.fr/2014PEST1157/document.

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L'homogénéité des caractéristiques est garantie par une présence en fibres constante en tout point du matériau. La dispersion d'une espèce dans une autre est régie par des mécanismes de convection et/ou de diffusion. Pour des objets de la taille d'une fibre métallique, ces deux phénomènes trouvent leur origine dans le cisaillement appliqué au matériau, une donnée souvent inconnue et difficile à mesurer dans des malaxeurs à béton. Dans un premier temps, nous proposons une méthode permettant d'estimer l'efficacité d'un malaxeur. Elle est basée sur la mesure du diamètre moyen de granules de ciment fabriqués dans ce malaxeur. Nous montrons que la mesure de ce diamètre moyen permet de quantifier le cisaillement moyen. Dans un second temps, nous présentons un moyen de mesurer la dispersion des fibres pendant le malaxage des bétons à base de mesures de résistivité électrique. Puis, dans un troisième temps, nous mesurons la présence en fibres pendant le malaxage et relions le temps nécessaire à l'obtention d'une répartition homogène à la capacité de cisaillement du malaxeur
Fibers are added to the concrete to give it news properties. The homogeneity of these characteristics is assured by a constant presence of fiber as the whole material. The dispersion of one species within another is governed by convection and/or diffusion mechanisms. Concerning objects having the size of steel fiber, these two phenomena are caused by the shearing applied to the material, an unknown and difficult to measure datum in the case of concrete mixer. To begin, a method allowing to estimate the mixer's shearing is suggested. This method is based on the measurement of the medium diameter of cement aggregates produced in the mixer. The link between the medium diameter and the mean shearing is established. In a second time, a mean to measure fiber dispersion from electrical resistivity measurements during the concrete mixing is presented. Then, in a third time, fiber dispersion are measured during mixing. The link between necessary time to obtain an homogeneous distribution and the mixer's shearing ability is established
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Hyensjö, Marko. "On fibre suspension flow modelling : mechanical fibre flocculation and fibre orientation /". Stockholm, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-344.

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Martinez, Pinon F. "Characterizing single-mode fibres and single-mode fibre lenses". Thesis, University of Southampton, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383403.

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Hale, Zoe Miranda. "Fibre optic sensors using adiabatically tapered single mode fibres". Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320155.

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Larsson, Per. "Dimensional Stability of Paper Influence of Fibre-Fibre Joints and Fibre Wall Oxidation". Licentiate thesis, KTH, Fibre and Polymer Technology, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4635.

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Papper är ett mycket mångsidigt material. Trots detta finns det ett flertal egenskaper som begränsar papperets användbarhet. Ett av de större problemen med cellulosa- och lignocellulosafibrer är att de sänker sin fria energi genom att sorbera vatten, och denna sorption förändrar papperets dimensioner. Detta fenomen kallas vanligtvis för bristfällig dimensionsstabilitet och uppträder i form av registerfel vid flerfärgstryck eller som krullning, buckling och vågiga papperskanter vid utskrift, kopiering och lagring, eller med en vidare definition som förkortad livslängd hos lådor på grund av mekanosorptivt kryp.

Avsikten med denna avhandling har varit att studera och kvantifiera vilka egenskaper som styr, och hur de påverkar, den vatteninducerade dimensionsförändringen som sker hos ett fibernätverk, samt hur dess dimensionsstabilitet kan förbättras. Detta har studerats både genom att ändra fiberns fuktsorptionsegenskaper och genom att förändra adhesionen och kontaktgraden mellan fibrerna i fiber-fiberfogarna. Fogegenskaperna har också varierats genom att tillverka laboratorieark torkade under inspänning samt ark torkade fritt för att minimera mängden inbyggda spänningar i arket.

Blekt kraftmassa har behandlats med polyelektrolytmultilager (PEM) för att förbättra adhesionen mellan fibrerna och för att öka kontaktgraden mellan fibrerna i fogen. Kontaktgraden har även minskats genom förhorning av fibrerna före arkformning. För de ark som fick torka fritt gav PEM-behandlingen en ökad hygroexpansionskoefficient, det vill säga dimensionsförändringen normaliserad mot förändringen i fuktinnehåll, vid samma förändring i relativ luftfuktighet medan förhorningen minskade hygroexpansionskoefficienten något. Om arken emellertid torkades under inspänning observerades ingen skillnad i hygroexpansionskoefficient mellan de olika fibermodifieringarna. Detta tolkades som ett resultat av en ökad kontaktzon och en större utbredning ut ur fogens plan, när arken torkades utan inspänning. En utbredning som medför att en större del av fiberns transversella expansion överförs som expansion i pappersplanet.

Fibrernas fuktsorptionsegenskaper förändrades genom natriumperjodatoxidering av 1,4-glukanernas C2-C3-bindning. Detta skapade sannolikt tvärbindningar i fiberväggen som förbättrade fiberväggens tålighet både genom att låsa fibrillerna närmare varandra och genom att ta bort potentiella adsorptionssäten som annars är tillgängliga för vattenadsorption. Perjodatoxidationen minskar också fibrernas kristallinitet och således frigjorde oxidationen hydroxylgrupper där vattenmolekyler kan adsorbera. Detta innebar att oxidationen både minskade och ökade interaktionen mellan vatten och fibervägg, men dock på olika strukturell nivå. Tvärbindningarna visade sig också märkbart reducera sorptionshastigheten när arken utsattes för en förändrad luftfuktighet så länge de inte tidigare utsatts för relativa luftfuktigheter nära mättnad. Som ett resultat av den lägre förändringen i fuktinnehåll vid en förändring i luftfuktighet från 20 till 85 % RF minskade dimensionsförändringens amplitud för de tvärbundna arken upp till 30 %. Emellertid uppvisade de tvärbundna arken en högre hygroexpansionskoefficeint, vilket innebär att de blev mer känsliga för absoluta förändringar i fuktinnehåll.


Paper is a very versatile material. Nevertheless, there are several factors limiting its usefulness, and one of the major issues is that cellulosic and ligno-cellulosic fibres lower their free energy by sorbing water and this water changes the dimensions of the paper. This phenomenon is usually referred to as a lack of dimensional stability and is often evident as misregister during multicolour printing or curl, cockle and wavy edges during printing, copying and storage or, with a wider definition, also as a shortened life-time of boxes during storage due to mechano-sorptive creep.

The work described in this thesis aims to study and quantify the importance of the different mechanisms causing water-induced dimensional changes in a fibre network and to investigate how to improve the dimensional stability of ligno-cellulosic materials. This has been done both by altering the fiber properties such as the moisture sorptivity and by changing the adhesion and degree of contact within the fibre-fibre joints. The properties of the fibre-fibre joints have been varied by drying laboratory sheets both under restraint and freely to minimise the generation of built-in stresses.

Bleached kraft fibres were treated using the polyelectrolyte multilayer (PEM) technique to improve the adhesion between the fibres and to increase the molecular contact within the joints. In contrast, the degree of contact was impaired by hornifying the fibres before sheet preparation. For sheets allowed to dry freely, the PEM-treatment increased the hygroexpansion coefficient, i.e. the dimensional movement normalised with respect to the change in moisture content, when subjected to changes in relative humidity whereas the hornification process resulted in a slightly lowered hygroexpansion coefficient. However, when the sheets were dried under restraint, the different joint and fibre modifications led to no difference in hygroexpansion coefficient. This was interpreted as being a result of an increase in the total contact zone between the fibres when the sheets were dried under restraint, with a greater extension in the outof- plain direction of the joint resulting in a transfer of a larger part of the transverse swelling to the in-plane expansion.

The sorptivity of the fibres was changed by oxidising the C2-C3 bond of the 1,4- glucans with periodate. This most likely created covalent cross-links in the fibre wall both improved the integrity of the fibre wall by locking adjacent fibril lamellae to each other and also removed possible sites for water sorption onto the cellulose surfaces. Periodate oxidation also led to a decrease in the crystallinity of the cellulose within the fibres, making more cellulose hydroxyl groups available for the adsorption of water molecules. This means that the oxidation both decreased and increased the interaction between the fibre wall and moisture but, on two different structural levels. The crosslinks significantly reduced the sorption rate when the papers was subjected to changes in relative humidity, as long as the fibres were not subjected to humidities close to saturation. The smaller change in moisture content when the relative humidity was changed between 20 and 85 % RH meant that the dimensional stability of the crosslinked sheets was increased. On the other hand, the hygroexpansion coefficient was increased in the case of papers made from fibres with the highest degree of oxidation, i.e. the sheets became more sensitive to absolute changes in moisture content.

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Larsson, Per A. "Dimensional Stability of Paper : Influence of Fibre-Fibre Joints and Fibre Wall Oxidation". Licentiate thesis, KTH, Fiberteknologi, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4635.

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Papper är ett mycket mångsidigt material. Trots detta finns det ett flertal egenskaper som begränsar papperets användbarhet. Ett av de större problemen med cellulosa- och lignocellulosafibrer är att de sänker sin fria energi genom att sorbera vatten, och denna sorption förändrar papperets dimensioner. Detta fenomen kallas vanligtvis för bristfällig dimensionsstabilitet och uppträder i form av registerfel vid flerfärgstryck eller som krullning, buckling och vågiga papperskanter vid utskrift, kopiering och lagring, eller med en vidare definition som förkortad livslängd hos lådor på grund av mekanosorptivt kryp. Avsikten med denna avhandling har varit att studera och kvantifiera vilka egenskaper som styr, och hur de påverkar, den vatteninducerade dimensionsförändringen som sker hos ett fibernätverk, samt hur dess dimensionsstabilitet kan förbättras. Detta har studerats både genom att ändra fiberns fuktsorptionsegenskaper och genom att förändra adhesionen och kontaktgraden mellan fibrerna i fiber-fiberfogarna. Fogegenskaperna har också varierats genom att tillverka laboratorieark torkade under inspänning samt ark torkade fritt för att minimera mängden inbyggda spänningar i arket. Blekt kraftmassa har behandlats med polyelektrolytmultilager (PEM) för att förbättra adhesionen mellan fibrerna och för att öka kontaktgraden mellan fibrerna i fogen. Kontaktgraden har även minskats genom förhorning av fibrerna före arkformning. För de ark som fick torka fritt gav PEM-behandlingen en ökad hygroexpansionskoefficient, det vill säga dimensionsförändringen normaliserad mot förändringen i fuktinnehåll, vid samma förändring i relativ luftfuktighet medan förhorningen minskade hygroexpansionskoefficienten något. Om arken emellertid torkades under inspänning observerades ingen skillnad i hygroexpansionskoefficient mellan de olika fibermodifieringarna. Detta tolkades som ett resultat av en ökad kontaktzon och en större utbredning ut ur fogens plan, när arken torkades utan inspänning. En utbredning som medför att en större del av fiberns transversella expansion överförs som expansion i pappersplanet. Fibrernas fuktsorptionsegenskaper förändrades genom natriumperjodatoxidering av 1,4-glukanernas C2-C3-bindning. Detta skapade sannolikt tvärbindningar i fiberväggen som förbättrade fiberväggens tålighet både genom att låsa fibrillerna närmare varandra och genom att ta bort potentiella adsorptionssäten som annars är tillgängliga för vattenadsorption. Perjodatoxidationen minskar också fibrernas kristallinitet och således frigjorde oxidationen hydroxylgrupper där vattenmolekyler kan adsorbera. Detta innebar att oxidationen både minskade och ökade interaktionen mellan vatten och fibervägg, men dock på olika strukturell nivå. Tvärbindningarna visade sig också märkbart reducera sorptionshastigheten när arken utsattes för en förändrad luftfuktighet så länge de inte tidigare utsatts för relativa luftfuktigheter nära mättnad. Som ett resultat av den lägre förändringen i fuktinnehåll vid en förändring i luftfuktighet från 20 till 85 % RF minskade dimensionsförändringens amplitud för de tvärbundna arken upp till 30 %. Emellertid uppvisade de tvärbundna arken en högre hygroexpansionskoefficeint, vilket innebär att de blev mer känsliga för absoluta förändringar i fuktinnehåll.
Paper is a very versatile material. Nevertheless, there are several factors limiting its usefulness, and one of the major issues is that cellulosic and ligno-cellulosic fibres lower their free energy by sorbing water and this water changes the dimensions of the paper. This phenomenon is usually referred to as a lack of dimensional stability and is often evident as misregister during multicolour printing or curl, cockle and wavy edges during printing, copying and storage or, with a wider definition, also as a shortened life-time of boxes during storage due to mechano-sorptive creep. The work described in this thesis aims to study and quantify the importance of the different mechanisms causing water-induced dimensional changes in a fibre network and to investigate how to improve the dimensional stability of ligno-cellulosic materials. This has been done both by altering the fiber properties such as the moisture sorptivity and by changing the adhesion and degree of contact within the fibre-fibre joints. The properties of the fibre-fibre joints have been varied by drying laboratory sheets both under restraint and freely to minimise the generation of built-in stresses. Bleached kraft fibres were treated using the polyelectrolyte multilayer (PEM) technique to improve the adhesion between the fibres and to increase the molecular contact within the joints. In contrast, the degree of contact was impaired by hornifying the fibres before sheet preparation. For sheets allowed to dry freely, the PEM-treatment increased the hygroexpansion coefficient, i.e. the dimensional movement normalised with respect to the change in moisture content, when subjected to changes in relative humidity whereas the hornification process resulted in a slightly lowered hygroexpansion coefficient. However, when the sheets were dried under restraint, the different joint and fibre modifications led to no difference in hygroexpansion coefficient. This was interpreted as being a result of an increase in the total contact zone between the fibres when the sheets were dried under restraint, with a greater extension in the outof- plain direction of the joint resulting in a transfer of a larger part of the transverse swelling to the in-plane expansion. The sorptivity of the fibres was changed by oxidising the C2-C3 bond of the 1,4- glucans with periodate. This most likely created covalent cross-links in the fibre wall both improved the integrity of the fibre wall by locking adjacent fibril lamellae to each other and also removed possible sites for water sorption onto the cellulose surfaces. Periodate oxidation also led to a decrease in the crystallinity of the cellulose within the fibres, making more cellulose hydroxyl groups available for the adsorption of water molecules. This means that the oxidation both decreased and increased the interaction between the fibre wall and moisture but, on two different structural levels. The crosslinks significantly reduced the sorption rate when the papers was subjected to changes in relative humidity, as long as the fibres were not subjected to humidities close to saturation. The smaller change in moisture content when the relative humidity was changed between 20 and 85 % RH meant that the dimensional stability of the crosslinked sheets was increased. On the other hand, the hygroexpansion coefficient was increased in the case of papers made from fibres with the highest degree of oxidation, i.e. the sheets became more sensitive to absolute changes in moisture content.
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Lee, Ching Hao. "Fire retardant behavior of Kenaf fibre reinforced Floreon composite". Thesis, University of Sheffield, 2018. http://etheses.whiterose.ac.uk/19908/.

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According to the report, more than 41% of fatalities in flight were to find to be caused by fire. In recent years, composites used in aircrafts are carbon fibre/ glass fibre reinforced epoxy, due to light weights and high strength properties. However, these composites are known as highly flammable. Serious fire incident will be created in a short time after a spark of fire. Furthermore, ingredients for fibre and epoxies are, toxic and resulting in the release of toxic gases during fire, and cutting off fresh air to survivors and hindering their escape. In the meantime, biopolymers have attracted considerable attention due to their environmentally friendly and sustainable nature, Kenaf Fibre (KF) is one of the most famous natural fibre used as a reinforcement in Polymer Matrix Composites (PMC). Kenaf is also known as Hibiscus Cannabimus L., and is an herbaceous annual plant that is grown in a wide range of weather conditions, growing more than 3 meters within 3 months. However, the inherent drawbacks associated with Floreon (FLO) based composites include brittleness, lower strength and high moisture sensitivity, which in turn limit their application in the aircraft industry. In order to overcome such drawbacks, two modification techniques were employed in this study: (1) incorporated kenaf fibre into polypropylene polymer with magnesium hydroxide flame retardant and (2) reinforces kenaf fibre and magnesium hydroxide by different combination of volume. Consequently, KF reinforced FLO or polypropylene (PP) composites with magnesium hydroxide (MH) flame retardant specimens were successfully developed using extrusion followed by hot pressing. The increment of KF contents in PP composites had shown higher tensile modulus and decomposed mass loss at onset temperature, but lower values in tensile strength, elongation, flexural strength and onset temperature. In the meantime, 25 wt% KF contented PP composite shown a slightly higher flexural strength, while the higher volume of MH filler in composites caused lower strength, tensile modulus, elongation, but with higher onset temperature and the 2nd peak temperature in thermogravimetric analysis (TGA) testing. Furthermore, increasing the KF contents in PP matrix has found lower mass residue. However, increasing of KF contents in MH contented composite had increased the mass residue at the end of the testing. On the other hand, the increment of the melt flow properties (MVR and MFR) was found for the KF or MH insertion, due to the hydrolytic degradation of the polylactic acid (PLA) in FLO. The deterioration of the entanglement density at high temperature, shear thinning and wall slip velocity were the possible causes for the higher melt flow properties. In the meantime, increasing the KF loadings caused the higher melt flow properties while the FLO composites with higher MH contents created stronger bonding for higher macromolecular chain flow resistance, hence, recorded lower melt flow properties. However, the complicated melt flow behavior of the KF reinforced FLO/MH biocomposites was found in this study. The high probability of KF-KF and KF-MH collisions was expected and there were more collisions for higher fibre and filler loading, causing lower melt flow properties. Besides that, insufficient resin for fibre wetting, hydrolytic degradation on the biopolymer and poor interfacial bonding were attributed to low strength profile. Yet, further addition of KF increased the tensile strength and flexural. Nevertheless, inserting KF and MH filler have shown positive outcome on flexural modulus. Insertion of KF and MH showed the deterioration of impact strength, while the addition of KF increased the impact strength. Meanwhile, FLO is a hydrophobic biopolymer which showed only a little of total water absorption. In this regard, for the first 24 hours, the water absorption rates were high for all bio-composites. Hence, it is worth mentioning that the high contents of KF in bio-composites shown higher saturation period and higher total amount of water absorption while MH caused shorter saturation period but lower total amount of water absorption. However, interface bonding incompatibility has increased the water absorption of KF/FLO/MH composites. Moreover, some synergistic effect was located in char formation, Tg reduction and a lower tan δ peak shown in the three-phase system (KF/FLO/MH). The MH filler was found to be more significant in enhancing mass residual. The Tg were show deterioration for all samples compared to pure FLO biopolymer. The melting temperature has found no meaningful change for either insertion of KF or MH or both. The values of co-coefficient, C recorded decreasing as increasing the fibre loading. This showing the fibres transfer the loading effectively. As conclusion, although 10KF5MH specimen does not have the best performance in mechanical properties, a higher flame retardancy shall provide KF reinforced FLO composite with MH filler for more applications in advanced sector especially, in hazardous environment.
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Draghetti, Michela. "Fibre naturali nel settore dei compositi: confronto fibre di lino vs. fibre di carbonio". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/18602/.

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I materiali compositi possiedono proprietà funzionali e di resistenza sempre più performanti grazie alla natura dei rinforzanti in fibra di carbonio, i quali però sono caratterizzati da criticità relative al processo di trasformazione altamente energivoro e dispendioso, all’inquinamento collegato alla produzione delle fibre e al trattamento di sizing, nonché alla difficoltà nello stadio di separazione dei costituenti del manufatto composito e del conseguente riciclo. A causa di queste problematiche sono stati introdotti in produzione materiali a matrice epossidica rinforzata con fibre di lino. Lo studio è stato indirizzato verso la caratterizzazione delle materie prime che compongono i manufatti, quindi fibre e semilavorati, mediante analisi termiche dinamiche in DSC e TGA con il fine di determinare la composizione e resistenza dei singoli componenti e la misura della variazione nel comportamento quando sono uniti per comporre i prepreg. Sono state eseguite delle prove di igroscopicità, umidità e densità per ottenere una panoramica precisa sulle differenze nella struttura delle fibre in carbonio e lino che le differenzia in modo apprezzabile. Sono stati laminati compositi reticolati secondo tecnologia in autoclave, le cui proprietà sono state definite mediante prove termiche dinamiche in DSC, TGA, DMA, prove alla fiamma mediante conocalorimetro, prove fisiche di igroscopicità, umidità e densità, prove ottiche al SEM in seguito ad una rottura in trazione. Parte del progetto seguito è stato direzionato all’ottimizzazione del ciclo produttivo in autoclave. La simulazione del nuovo ciclo di cura industriale, RAPID, è stata eseguita per valutare la variazione della Tg finale e il grado di curing, nonché le proprietà termiche e meccaniche già valutate nel ciclo di cura, STANDARD.
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Apriyanto, Haris. "Study, analysis and experimental validation of fiber refractometers based on single-mode, multimode and photonic crystal fibers for refractive index measurements with application for the detection of methane". Thesis, Toulouse, INPT, 2019. http://www.theses.fr/2019INPT0022.

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La mesure de l'indice de réfraction a été étudiée depuis qu'Ernest Abbé aie initialement conçu un réfractomètre en 1869, appelé le réfractomètre d'Abbé. Depuis lors, de nombreux réfractomètres ont été développés tels que le réfractomètre à prisme optique ainsi que le réfractomètre à fibre optique, en raison de leurs applications étendues pour la détection de divers paramètres physiques, biologiques et chimiques. Récemment, un grand nombre de chercheurs ont mis au point des réfractomètres basés sur des fibres optiques, exploitant des mécanismes tels que la résonance des plasmons de surface (SPR), les interférences multimodes, les fibres à réseaux de Bragg (FBG), les fibres à réseaux à longues périodes (LPG), les fibres optiques coniques et la fibre multimode à gaine dénudée. Les capteurs fibrés sont avantageux grâce à leur immunité contre les interférences électromagnétiques, passivité électrique au niveau de la sonde de détection et potentiel de mesure in situ à long terme. Cette thèse concerne le développement de modèles complets fonctionnels et précis pour les réfractomètres à fibres optiques basés sur la modulation d'intensité optique, en particulier la réfractométrie à fibre multimode à gaine dénudée ainsi que les systèmes hybrides associant fibres monomode et multimode, et un réfractomètre hybride tout fibré utilisant des fibres à cristaux photoniques. L'objectif clé de ce travail est de caractériser les performances de ces réfractomètres à fibres optiques basés sur la modulation d'intensité en termes de réponse en puissance, de sensibilité, de résolution et de dynamique de mesure. Les résultats de simulation qui sont corroborés expérimentalement démontrent que la très grande sensibilité obtenue dans la zone II (c'est-à-dire le régime de détection typiquement utilisé pour mesurer l'indice du milieu supérieur à l'indice de gaine mais inférieur ou égal à l'indice du coeur) pour tous les trois réfractomètres. Cependant, la sensibilité dans la Zone (c’est-à-dire le régime de détection pour lequel l’indice du milieu à mesurer est supérieur à celui du coeur) est très faible. Ainsi, un refractomètre fibré hybride monomode-multimode est utilisé pour améliorer la sensibilité dans la Zone III. D'autre part, la sensibilité pour la zone I (c'est-à-dire le régime de détection pour mesurer l’indice du milieu inférieur à l'indice de la gaine) a été améliorée en augmentant l'absorption des ondes évanescentes à l'aide du réfractomètre hybride tout fibré à base de fibres à cristaux photoniques à coeur solide. En termes d'application réelle du réfractomètre à fibre pour la détection biochimique, une preuve de concept pour un capteur du gaz méthane a été démontrée en utilisant les supramolécules de cryptophane-A qui permettent de piéger les molécules du méthane. Le cryptophane-A incorporé dans un film hôte à base de styrène acrylonitrile (SAN) est appliqué sur la zone dénudée du capteur comme une région fonctionnalisée. L'indice de réfraction de cette couche sensible augmente proportionnellement avec l'augmentation de la concentration du méthane, ce qui induit une variation de la puissance optique transmise dans le capteur fibré
Refractive index measurement has been studied since Ernest Abbé initially designed a refractometer in 1869, which is named the Abbé refractometer. Since then, numerous types of refractometers have been developed by employing either the optical prism-based refractometer or the optical fiber-based refractometer, due to their wide-ranging applications such as for sensingvarious physical, biological and chemical parameters. Recently, a large number of researchers have been developing refractometers based on optical fibers, exploiting mechanisms such as surface plasmon resonance (SPR), multimode interference, fiber Bragg gratings (FBG), long period gratings (LPG), tapered optical fibers, and striped-cladding multimode fibers (MMF), for their advantages in immunity against electromagnetic interference, electrical passivity at the sensing probe, and capability to long term in-situ measurement. This thesis concerns the development of comprehensively functional and accurate models for optical fiber refractometers based on optical intensity modulation, in particular for stripped-cladding MMF refractometry as well as hybrid systems involving a combination of single-mode-multimode fiber refractometery and the all-fiber hybrid refractometer using photonic crystal fibers. A key objective of this work is to characterize the performance of these intensity-based optical fiber refractometers in terms of their power response, sensitivity, resolution, and dynamic range. The simulation results which are corroborated experimentally demonstrate very high sensitivity being obtained in Zone II (i.e. the sensing regime typically employed for measuring a sensing medium index higher than the cladding index but less than or equal to the core index) for all three types of refractometers. However, the sensitivity in Zone III (i.e. the sensing regime for which the sensing medium index is higher than the core index) is very low. A hybrid single-mode fiber - multimode fiber configuration is used to improve the sensitivity in Zone III. On other hand, the sensitivity for Zone I (i.e. the sensing regime typically employed for measuring a sensing medium index lower than the cladding index) has been improved by increasing evanescent wave absorption using the all-fiber hybrid refractometer based on solid-core photonic crystal fibers. As a further potential of the fiber refractometer for applications in biochemical sensing, the proof-of-concept for a methane gas sensor has been demonstrated using supramolecular cryptophane-A which enables to trap the methane molecules. Cryptophane-A incorporated into a functionalized film of StyreneAcrylonitrile (SAN) host is applied to a de-cladded region of the sensor as the sensitive region. The refractive index of this functionalized layer increases proportionally with increasing methane concentration, subsequently inducing variations in the transmitted optical power along the fiber sensor
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Libros sobre el tema "Fibre"

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Selle, Giovanni. Fibre. Italy: Il Ceppo, 1988.

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Engineers, Institution of Electrical, ed. Optical fibre. London, U.K: P. Peregrinus on behalf of the Institution of Electrical Engineers, 1988.

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C, Trowell H., Burkitt D. P y Heaton K. W, eds. Dietary fibre, fibre-depleted foods and disease. London: Academic Press, 1985.

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van der Kamp, J. W., N. G. Asp, J. Miller Jones y G. Schaafsma, eds. Dietary Fibre. The Netherlands: Wageningen Academic Publishers, 2004. http://dx.doi.org/10.3920/978-90-8686-662-5.

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van der Kamp, Jan Willem, Julie Jones, Barry McCleary y David Topping, eds. Dietary fibre. The Netherlands: Wageningen Academic Publishers, 2010. http://dx.doi.org/10.3920/978-90-8686-692-2.

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Husemoller, Dale. Fibre Bundles. New York, NY: Springer New York, 1994. http://dx.doi.org/10.1007/978-1-4757-2261-1.

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Carty, Peter. Fibre properties. 2a ed. Gosforth: Formword, 1994.

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Foundation, British Nutrition. Dietary fibre. London: British Nutrition Foundation, 1988.

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Husemöller, Dale. Fibre bundles. 3a ed. New York: Springer-Verlag, 1994.

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Gurr, M. I. Dietary fibre. Washington, D.C: ILSI Press, 1994.

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Capítulos de libros sobre el tema "Fibre"

1

Leech, C. M. "Fibre Geometry and Fibre Mechanics". En Solid Mechanics and Its Applications, 5–36. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-7841-2_2.

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Sampson, William Wyatt. "Poisson Fibre Processes I: Fibre Phase". En Engineering Materials and Processes, 105–57. London: Springer London, 2009. http://dx.doi.org/10.1007/978-1-84800-991-2_4.

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Ferguson, A. I., M. W. Phillips, D. C. Hanna y A. C. Tropper. "Fibre Lasers". En Laser Spectroscopy VIII, 422–25. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-540-47973-4_135.

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Duplij, Steven, Steven Duplij, Paulius Miškinis, Steven Duplij, Allen Parks, Cosmas Zachos, Artur Sergyeyev, Robert Marnelius y Wojciech Florek. "Fibre Bundle". En Concise Encyclopedia of Supersymmetry, 148. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/1-4020-4522-0_193.

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Gadea, P. M. y J. Muñoz Masqué. "Fibre Bundles". En Analysis and Algebra on Differentiable Manifolds, 183–232. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-3564-6_5.

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Sibley, M. J. N. "Optical Fibre". En Optical Communications, 6–75. London: Macmillan Education UK, 1995. http://dx.doi.org/10.1007/978-1-349-13524-0_2.

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Sibley, M. J. N. "Optical Fibre". En Optical Communications, 7–46. London: Palgrave Macmillan UK, 1990. http://dx.doi.org/10.1007/978-1-349-20718-3_2.

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Guaraldo, Francesco, Patrizia Macrì y Alessandro Tancredi. "Fibre Bundles". En Topics on Real Analytic Spaces, 149–60. Wiesbaden: Vieweg+Teubner Verlag, 1986. http://dx.doi.org/10.1007/978-3-322-84243-5_8.

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Simmonds, Andrew. "Fibre Optics". En Data Communications and Transmission Principles, 132–52. London: Macmillan Education UK, 1997. http://dx.doi.org/10.1007/978-1-349-13900-2_6.

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Starr, Trevor F. "Fibre Cables". En Glass-Fibre Databook, 236–42. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1492-9_14.

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Actas de conferencias sobre el tema "Fibre"

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Dantas, Lucas Cristiano, Everton Cavalcante y Thais Batista. "Facilitando o Desenvolvimento de Aplicações de Internet das Coisas: Um Estudo Experimental". En Workshop do Testbed FIBRE. Sociedade Brasileira de Computação, 2021. http://dx.doi.org/10.5753/fibre.2021.15767.

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Plataformas para Internet das Coisas (IoT) tem como um dos principais objetivos facilitar o desenvolvimento de aplicações. No entanto, a implantação e configuração dos componentes e serviços providos por tais plataformas para serem utilizados no desenvolvimento de uma determinada aplicação de IoT é, em geral, um processo laborioso. O FIWARE-Lab@RNP é um laboratório virtual Web desenvolvido com o propósito de possibilitar a utilização de recursos da plataforma FIWARE de forma transparente. Utilizando o FIWARE-Lab@RNP, os usuários podem facilmente criar, configurar e gerenciar componentes e serviços da FIWARE, minimizando assim a curva de aprendizado referente a essas tarefas. Este artigo apresenta os resultados de um experimento controlado realizado com usuários com o objetivo de avaliar o potencial do FIWARE-Lab@RNP para reduzir o esforço de desenvolvimento de aplicações e contribuir com uma melhor experiência no uso de plataformas de IoT.
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Oliveira-Jr, Antonio, Ciro Macedo, Gabriel M. F. de Almeida, Leonardo Rodrigues, Marcos Abreu, Sand Correa y Kleber Cardoso. "Experimentos da Proposta de Integração SOFTWAY4IoT e FIWARE-Lab@RNP para Internet das Coisas (IoT)". En Workshop do Testbed FIBRE. Sociedade Brasileira de Computação, 2021. http://dx.doi.org/10.5753/fibre.2021.15768.

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Espera-se que a quantidade de objetos da Internet das Coisas cresça de forma exponencial, aumentando consequentemente o fluxo de dados trafegados pela rede. Para suportar este aumento, a diversidade de tecnologias e a possível distribuição geográfica destes objetos conectados, é necessário uma infraestrutura apta a gerenciar estas demandas. Este trabalho apresenta os detalhes da implantação e os experimentos de integração do SOFTWAY4IoT realizado junto à infraestrutura computacional (máquinas virtuais) disponibilizada pela RNP e a plataforma FIWARE-Lab@RNP. O caso de uso é lixeiras inteligentes para coleta de dados acerca da quantidade de resíduos orgânicos e monitoramento de níveis de lixo das lixeiras seletivas.
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Coelho, Igor M. y Vitor N. Coelho. "NeoCompiler Eco: experimentação de consenso em blockchain e contratos inteligentes". En Workshop do Testbed FIBRE. Sociedade Brasileira de Computação, 2021. http://dx.doi.org/10.5753/fibre.2021.15770.

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Este artigo apresenta a plataforma NeoCompiler Eco, com foco em desenvolvimento e experimentação para contratos inteligentes, bem como sistemas de consenso para blockchain. O NeoCompiler é um projeto livre iniciado em 2017, já estabelecido online (em produção) e com usuários em escala global. Ele consiste em diversos módulos, dentre eles: suporte a compilação de contratos inteligentes Turing-completos escritos em linguagens populares para o bytecode da blockchain; testes e implantação de contratos em uma rede pública compartilhada temporária e de alcance global; ferramentas didáticas auxiliares para conversões de tipos e blockchain explorer interno para visualização de transações e blocos; chat interativo para dúvidas entre participantes (globais); interação e visualização gráfica do processo de consenso. Dentre as realizações da plataforma, ressaltamos: apoio a disciplinas no tópico de blockchain, realização de hackathons no Brasil, América Latina e mundiais; apoio à rede experimental "Nosso DLT'' e desenvolvimento de algoritmos de consenso inovadores, como o dBFT 2.0 lançado em 2019.
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Prates Jr., Nelson G., Allex Magno Andrade, Emerson Ribeiro de Mello, Michelle Silva Wangham y Michele Nogueira. "Um Ambiente de Experimentação em Cibersegurança para Internet das Coisas". En Workshop do Testbed FIBRE. Sociedade Brasileira de Computação, 2021. http://dx.doi.org/10.5753/fibre.2021.15771.

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A grande escala da Internet das Coisas exige estruturas complexas capazes de suportar cenários experimentais com escala suficiente para avaliar eficientemente soluções de cibersegurança contra ataques DDoS baseados em botnets. Este trabalho descreve uma arquitetura para o MENTORED Testbed, um ambiente de experimentação criado sobre a Infraestrutura Definida por Software da Rede Nacional de Ensino e Pesquisa (IDS-RNP). O testbed cria experimentos com redes de longa distância, tecnologias de nuvem e com dispositivos sem fio inseridos nos servidores do IDS-RNP. O comportamento do testbed foi analisado por meio de um caso de uso que reproduz automaticamente capturas de rede em um cenário realístico para avaliar propostas de detecção de botnets.
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Almeida, Francielly S., Gustavo T. Laureano, Leandro A. Freitas y Sand L. Correa. "Desenvolvimento de uma Aplicação para Escritórios Inteligentes Usando a Plataforma FIWARE e o ambiente FIWARE-Lab@RNP". En Workshop do Testbed FIBRE. Sociedade Brasileira de Computação, 2021. http://dx.doi.org/10.5753/fibre.2021.15766.

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Este trabalho apresenta os resultados de um estudo comparativo envolvendo a FIWARE, uma plataforma de desenvolvimento de aplicações de Internet das Coisas (IoT), e o FIWARE-Lab@RNP, um laboratório virtual e remoto para prototipação e experimentação de aplicações IoT baseadas na plataforma FIWARE. O objetivo principal do FIWARE-Lab@RNP é facilitar a criação, configuração e gerenciamento de implantações FIWARE, disponibilizando instâncias da plataforma de forma transparente e sem a necessidade de conhecer especificidades dos principais componentes e serviços da plataforma. O estudo apresenta uma visão prática e tem como objetivo mensurar o quanto um ambiente, com as características apresentadas pelo FIWARE-Lab@RNP, diminui o esforço de desenvolvimento de aplicações IoT baseadas na plataforma FIWARE. Para atingir esse objetivo, desenvolvemos uma aplicação piloto de IoT, no contexto de Escritórios Inteligentes, diretamente na plataforma, como também através dos recursos providos pelo FIWARE-Lab@RNP.
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Trindade, Yan, Luiz Henrique Calixto de Souza, Lucas C. Jorge, Andre G. Damaceno y Jacir L. Bordim. "Desenvolvimento de Aplicação IoT utilizando a Plataforma Integrada Softway4IoT e Fiware". En Workshop do Testbed FIBRE. Sociedade Brasileira de Computação, 2021. http://dx.doi.org/10.5753/fibre.2021.15769.

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A Internet das Coisas (IoT) abrange uma diversidade de dispositivos, incluindo sensores e atuadores com funcionalidades, capacidades e características bastante distintas. A heterogeneidade dos dispositivos IoT requer mecanismos adequados de gestão, coleta e disponibilização de dados. Neste contexto, o presente trabalho tem como objetivo avaliar duas plataformas que se complementam no gerenciamento de dispositos IoT. Para tal, este trabalho apresenta uma aplicação que utiliza API's genéricas e reusáveis da plataforma Fiware com o poder de gerenciamento de múltiplos sensores da plataforma Softway4IoT para abstrair os diferentes protocolos de comunicação no desenvolvimento de uma aplicação de teste.
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Nassif, Nadia A., Luciano Martins, Luciano A. Domingos, Fernando N. N. Farias, José L. S. Lopes, Lucas Borges, Niudomar S. A. Chaves, Marcos Schwarz y Rafael C. Figueiredo. "Aplicação Northbound baseada em Transport API (TAPI) usando Controlador ONOS e transponder configurável de padrão aberto para a criação de circuito óptico fim a fim". En Workshop do Testbed FIBRE. Sociedade Brasileira de Computação, 2021. http://dx.doi.org/10.5753/fibre.2021.15765.

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Este artigo descreve uma arquitetura para controle de redes ópticas que possibilita o aprovisionamento de circuitos ópticos fim a fim. Para isso, foi desenvolvida uma aplicação northbound pelo CPQD que utiliza Transport API (TAPI) e RESTCONF para interagir com o controlador ONOS e solicitar serviços, incluindo o aprovisionamento e desaprovisionamento de circuitos ópticos. Os testes foram realizados utilizando um emulador de transponders ópticos, desenvolvido pelo projeto ODTN do ONF, com uma extensão, desenvolvida pela RNP, para a inclusão do plano de dados. O desenvolvimento desta aplicação engloba os conceitos de SDN e desagregação e permite, através de um ambiente emulado, uma análise prévia de possíveis trabalhos futuros a serem realizados em testbeds com equipamentos físicos.
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Weber, HP y W. Lüthy. "Fibre lasers for surgery". En The European Conference on Lasers and Electro-Optics. Washington, D.C.: Optica Publishing Group, 1996. http://dx.doi.org/10.1364/cleo_europe.1996.cthm1.

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According to the absorption properties of tissue, a laser for microsurgery should emit radiation of 2.9 µm wavelength. This wavelength is absorbed in tissue within 1 µm and leads to evaporation with a minimum thermal damage in the walls of the incision. If monomode emission is used, the laser light can be focused to a very small spot. The resulting thin coagulation layer, however, cannot stop bleeding from larger vessels. For haemostasis a wavelength of 2 µm with a penetration depth of several hundred µm is preferable. For application in surgery therefore both wavelength 2 µm and 3 µm have to be available. These wavelengths can be generated in fibre lasers doped with Erbium for 3µm emission [1] or Thulium and Holmium for 2 µm emission [2]. Monomode fibre lasers are optically excited with a pump beam that has to be launched into the small rare earth- doped core of the fibre with a diameter of typically less than 10 µm. In view of this small target also the pump laser has to be operated in low transverse mode order or even in fundamental mode. For such a pump laser the available power is limited to about 1 Watt. In our experiments an output power of 158 mW has been reached for ZBLAN:Er3+ fibres [1] and 30 mW for silica:Tm:Ho fibres. These values were only limited by the available pump power. The output power of CW monomode fiber lasers, can be enhanced using a double clad fibre structure [3]. Double clad fibres can be excited with powerful multimode laserdiode arrays. An output power of several Watts has already been demonstrated in a Nd3+ doped double clad fibre [4,5].
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Rao, C. B. Kameswara, S. R. R. Teja Prathipati y Hanuma Kasagani. "Impact of the Fiber Distribution Characteristics on the Uniaxial Behaviour of Fiber-Reinforced Composites- An Experimental Study". En The 2nd International Conference on Civil Infrastructure and Construction. Qatar University Press, 2023. http://dx.doi.org/10.29117/cic.2023.0083.

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The demand for development of fiber-reinforced composites has enhanced as the practise of integrating fibres into concrete has become prevalent over the past few decades.. The intersection zone where the fiber crossing the fracture surface and fiber distribution characteristics in the composite plays an important role in predicting the overall performance of the Fiber Reinforced Composite (FRC). To ascertain the orientation and distribution of the fibres in various FRC's, a variety of experimental methods have been proposed in the literature. This study aimed to assess the impact of fibre orientation and fibre distribution characteristics on the fresh and hardened properties of Hybrid FRC's and Hybrid Graded FRC's containing glass and steel fibres. It can be concluded that the methods adopted in this study for calculating the fiber distribution and orientation characteristics were reliable and the proposed equations were successful in predicting the uniaxial behaviour of FRC. Positive synergy was observed in the Hybrid Graded FRC specimens, which was attributed to the superior fibre distribution characteristics displayed by hybrid grading of fibres, which was rationalised by the fact that modifying the fibre distribution characteristics would affect the FRC's behaviour.
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Dianov, E. M., K. M. Golant, V. M. Mashinsky, O. I. Medvedkov, I. V. Nikolin, O. D. Sazhin y S. A. Vasiliev. "Highly Photosensitive Germanosilicate Fibre Codoped with Nitrogen". En Bragg Gratings, Photosensitivity, and Poling in Glass Fibers and Waveguides. Washington, D.C.: Optica Publishing Group, 1997. http://dx.doi.org/10.1364/bgppf.1997.bme.2.

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In-fiber grating writing based on the photorefractive effect is now attracting considerable interest [1]. However, photosensitivity of standard germanosilicate fibres with a moderate concentration of germanium in the core (5 ÷ 7 mol.% GeO2) is not large and does not allow efficient writing of refractive index gratings. To increase the writing efficiency, one has to increase the germanium concentration and/or load the fibre with hydrogen [2]. Increasing the germanium concentration results in a reduction of the mode spot size and in additional losses when the fibre is spliced with a standard telecommunication fibre. Hydrogen loading complicates the grating technology and raises losses in the IR region owing to the OH-group absorption. Therefore, optimization of the grating writing technology and development of novel types of photosensitive fibres are now high on the agenda.
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Informes sobre el tema "Fibre"

1

McCloghrie, K. Fibre Channel Management MIB. RFC Editor, mayo de 2005. http://dx.doi.org/10.17487/rfc4044.

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Zhang, Lin. High Extinction Ratio In-Fibre Polarisers by Exploiting Tilted Fibre Bragg Grating Structures for Single-Polarisation High-Power Fibre Lasers and Amplifiers. Fort Belvoir, VA: Defense Technical Information Center, noviembre de 2009. http://dx.doi.org/10.21236/ada524631.

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Weber, R., M. Rajagopal, F. Travostino, M. O'Donnell, C. Monia y M. Merhar. Fibre Channel (FC) Frame Encapsulation. RFC Editor, diciembre de 2003. http://dx.doi.org/10.17487/rfc3643.

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DeSanti, C., V. Gaonkar, H. K. Vivek, K. McCloghrie y S. Gai. Fibre-Channel Name Server MIB. RFC Editor, abril de 2006. http://dx.doi.org/10.17487/rfc4438.

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DeSanti, C., K. McCloghrie, S. Kode y S. Gai. Fibre Channel Routing Information MIB. RFC Editor, septiembre de 2006. http://dx.doi.org/10.17487/rfc4625.

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DeSanti, C., H. K. Vivek, K. McCloghrie y S. Gai. Fibre Channel Zone Server MIB. RFC Editor, agosto de 2007. http://dx.doi.org/10.17487/rfc4936.

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Jones, Sid. Fibre Channel Avionics Bus Monitor. Fort Belvoir, VA: Defense Technical Information Center, febrero de 2001. http://dx.doi.org/10.21236/ada389673.

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Piggott, Michael R. Mesomechanical Model for Fibre Composites. Fort Belvoir, VA: Defense Technical Information Center, julio de 1990. http://dx.doi.org/10.21236/ada226792.

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Rajagopal, M., R. Bhagwat y W. Rickard. IP and ARP over Fibre Channel. RFC Editor, junio de 1999. http://dx.doi.org/10.17487/rfc2625.

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Rajagopal, M., E. Rodriguez y R. Weber. Fibre Channel Over TCP/IP (FCIP). RFC Editor, julio de 2004. http://dx.doi.org/10.17487/rfc3821.

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