Dissertations / Theses on the topic 'RAYON FIBER'
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Modh, Haresh A. "Chemical treatment and adhesion in internally reinforced rayon fibers." Ohio : Ohio University, 1988. http://www.ohiolink.edu/etd/view.cgi?ohiou1182867766.
Full textCoda, Ryan. "A Study of Cellulose Based Biodegradable Foams and Sponges." Thesis, Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/6961.
Full textRabe, Richard L. "Drag and pressure die flow effects on the production and properties of a Rayon-Nylon skin-core type composite fiber." Ohio University / OhioLINK, 1987. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1183057790.
Full textHolmström, Marcus. "Design of a Carbon Fiber Thermocouple for Elevated Temperature Measurements." Thesis, KTH, Materialvetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-279105.
Full textTermoelement är ett av de mest använda instrumenten för temperaturavläsning vid upphöjda temperaturer. Idag finns det bara några få typer av termoelement som är byggda för temperaturer över 1600 ℃, däremot innehar dom vanligtvis en temperaturmätnings osäkerhet på cirka 1% vid dessa höga temperaturer. Över 1600 ℃ temperaturintervallet har de flesta högtemperatur termoelement en tendens att skifta i mätningarna vilket orsakar en felaktig och inexakt mätning av den faktiska temperaturen. Denna avhandling undersöker användningen av kolfiber som ett material för användning i termoelement, genom kombinationen av två olika grafitfibrer. Polyacrylonitrile- (PAN) och Rayon-baserade fibrer användes i en sammansatt kombination upp till en temperatur av 200 ℃, där spänningen mättes mot temperaturen. Studien visar en lovande och stabil linjär effekt av dess elektromotoriska spänning för denna typ av termoelement med kommersiellt tillgängliga kolfibrer vid lägre temperaturer. En jämförelse görs mellan de vanliga termoelementen av typ K och S vid rumstemperaturer, resultaten visar att grafittermoelementen har cirka 21% av den termoelektriska effektiviteten hos den för en typ K eller S termoelement vid 25 ℃. När det gäller dess funktionalitet vid högre temperaturer har liknande grafitmaterial studerats och funnit en potentiell ökning av den termoelektriska stabiliteten vid högre temperaturer över 2000 ℃, vilket visar att grafitbaserade termoelement gör sig väl lämpade för högtemperaturmätningar.
Li, Jian-xing. "Coupling agent effects on the interfacial adhesion in a sheath/core type bicomponent fiber." Ohio : Ohio University, 1989. http://www.ohiolink.edu/etd/view.cgi?ohiou1182441608.
Full textLe, Marec Nathalie. "Influence de l'irradiation précoce du cervelet aux rayons X sur l'apprentissage et la mémorisation chez le rat." Rouen, 1995. http://www.theses.fr/1995ROUES030.
Full textCourtois, Loïc. "Monofilament entangled materials : relationship between microstructural properties and macroscopic behaviour." Thesis, Lyon, INSA, 2012. http://www.theses.fr/2012ISAL0138.
Full textPlaying with the architecture of a material is a clever way of tailoring its properties for multi-functional applications. A lot of research have been made, in the past few years, on what is now referred to as “architectured materials” (metal foams, entangled materials, steel wool, etc), mostly for their capacity to be engineered in order to present specific properties, inherent to their architecture. In this context, some studies have been carried out concerning entangled materials but only a few on monofilament entangled materials. Such a material, with no filament ends, could exhibit interesting properties for shock absorption, vibration damping and ductility. In this study, entanglements were manually produced, using different types of wire, and submitted to constrained (inside a PTFE die) in-situ compressive tests within the laboratory tomograph. This technique enabled a 3D, non destructive, microstructural characterization of the complex architecture of these materials, along with the analysis of their macroscopic mechanical properties. The stiffness of this material was found to be in a 20-200 MPa range and homogeneous samples could be obtained, while lowering their stiffness, by pre-deforming the initial wire as a spring. Damping measurements were performed using different types of entanglements (constitutive materials, volume fraction, wire diameter, wire shape) under both monotonic and dynamic loadings and directly linked to the measurements of the number of contacts. The Dynamic Mechanical Analysis underlined the great capacity of this material to absorb energy with a loss factor of about 0.25 and damping was found to decrease with the stiffness of the entanglement. The mechanical properties of this material were first modeled using an analytical “beam” model based on the experimental evolution of the mean distance between contacts and a good agreement was found with the experimental results. In parallel, a Discrete Element Method was used in order to model the compressive behaviour of Monofilament Entangled Materials. Although purely elastic properties were taken into account in the model, a very good agreement with the experimental results was obtained by adjusting the friction coefficients of the model. This tends to prove that the plasticity of these entangled materials is rather due to the structure (friction) than to the constitutive material itself
Thomas, Jérémie. "Impact de la nanostructuration des fibres dopées Erbium sur leurs performances : application aux contraintes du spatial." Thesis, Montpellier 2, 2013. http://www.theses.fr/2013MON20178/document.
Full textThis thesis focuses on the impact of nanostructuration on the performance of Erbium Doped Fiber in severe environment like Space. This study is motivated by the fact that no on-the-shell Erbium Doped Fiber can satisfy the space requirement, disabling the availability of the AOFD and stongly limiting the interest of the WDM technology for satellites. Several fiber based on different technologies have been tested in order to check their behavior under gamma radiations. We have defined an objective criterion for the selection of erbium doped fibers, and showed elements for hardening aluminum co-doped fibers, based solely on design parameters. In this way, we brought to the fore a radiation hardened fiber, based on silica nanoparticles, exhibiting a power decrease of 1 dB after a typical space mission. We also focused on EDFA modeling by proposing an evolved model taking into account non-linear effects due to the complex spectroscopy of Erbium. This model is completed by including irradiation effects thanks to a model such as Chen's one. The photobleaching effect that has been found to be strong is also considered
Blanchet, Thomas. "Influence des radiations (X, gamma, protons et électrons) sur les mesures par réseaux de Bragg à fibres optiques en environnement haute température." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSES045.
Full textOptical fiber temperature sensors have numerous advantages such as their small sizes, low weights and their immunity to a large band of the electromagnetic spectrum. The fiber Bragg gratings technology has the same advantages than the other optical sensors and is also characterized with an ultra-fast time response with a temperature accuracy better than 0.5°C. For nuclear environments such as near-Earth space or a nuclear reactor core the radiation – and the temperature – influence the performances of Bragg gratings. In this manuscript, we studied the behaviors of three gratings types: type I gratings are photo-inscribed with continuum or pulsed laser. They cannot resist to temperature higher than 400°C. Type R – Regenerated – gratings are done as type I with a further high-temperature treatment (> 600°C) to create a new grating resistant to temperatures exceeding 1000°C. Type II gratings are inscribed with femtosecond laser and are well-known to have a thermal stability as good as type R gratings. Regarding their responses to radiation and thermal constraints, type I gratings are unstable under radiations even with pre-thermal annealing (300°C). In addition, larger is the dose-rate or the accumulated dose larger the grating degradation is. Type R gratings are unstable under radiations at room temperature. However for the irradiation temperature above 150°C these gratings present an equivalent temperature error due to radiations of less than 1°C. After a thermal treatment at a temperature above 450°C, type II gratings are stable under radiations at room temperature (less than 1°C of radiation induced error)
Harry, I. D. "Modification and characterisation of carbon fibre ion exchange media." Thesis, Loughborough University, 2008. https://dspace.lboro.ac.uk/2134/14123.
Full textGillet, Pierre. "Validation d'un dosimètre patient temps réel basé sur fibre optique pour la tomodensitométrie X à l'aide de simulations Monte Carlo." Thesis, Strasbourg, 2018. http://www.theses.fr/2018STRAE025.
Full textThis work focuses on the simulation of CT exam, and aims to validate a new real-time patient dose measurement method that uses a scintillating optical fiber. First, we studied our dosimeter’s energy response, and we showed that it was close to the response of the ion chambers currently used. Then, we successfully modeled a scanner, and found that during the exam, patient dose and measured dose were affected differently by parameters such as the table height, the patients positioning or the patients morphology. However, when accounting for such parameters, it was possible to compute the dose delivered to the patient during an exam using the scintillating fiber measurement. We consider that when coupled with monte-carlo simulations, this measurement could be used to estimate accurately the organ dose delivered during an exam
Wilen, Linda, Daniel Norin, and Anna Eriksson. "Bomullens nya ansikte : Kan man finna ett material som kan agera substitut till bomullen för producenter inom yrkeskläder?" Thesis, Högskolan i Borås, Institutionen Textilhögskolan, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-20830.
Full textProgram: Textil produktutveckling med entreprenörs- och affärsinriktning
Cangialosi, Chiara. "Performances of Raman and Brillouin fiber-based sensing of temperature and strain in harsh environments." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSES018/document.
Full textThis PhD thesis is conducted in the joint supervision of both the University Jean Monnet of Saint Etienne (France) and the University of Palermo (Italy) in collaboration with the French national agency for the management of radioactive wastes (ANDRA). The aim of the Thesis is to evaluate the performances of distributed optical fiber sensors (based on Raman and Brillouin scattering technologies) that will be employed for monitoring industrial site for deep geological disposal for high and long-lived intermediate level activity radioactive waste (HL-W and LL/IL-W, respectively), called Cigéo. In this context, the distributed optical fiber sensors will provide a time and spatial cartography of the strain and temperature inside the disposal cell. The severe environment of Cigéo requires the sensor evaluation taking into account the resulting degradation of the sensing optical fiber. The sensor response is affected by y-rays and hydrogen presences inside the storage cells. In both cases a decrease of the optical fiber transmission, due to the radiation or hydrogen induced attenuation (RIA or HIA) is observed and limits the sensing distance range of the sensor. Moreover, the two different environment constraints lead to errors in the temperature or strain evaluation for both sensor technologies. This Thesis work establishes the guidelines to select and design distributed optical fiber sensors suitable to operate in radiation environment such as Cigéo one
Lessard, François. "Validation d'un détecteur à fibre scintillante plastique pour la dosimétrie de photons aux énergies diagnostiques." Thesis, Université Laval, 2012. http://www.theses.ulaval.ca/2012/29448/29448.pdf.
Full textYou, Yan. "Pulsed Laser Injected Enhancement Cavity for Laser-electron Interaction." Phd thesis, Université Paris Sud - Paris XI, 2014. http://tel.archives-ouvertes.fr/tel-01011958.
Full textSHODJAIE, GHAZAIE AFSANE. "Contribution a l'etude de la propagation de la lumiere dans les fibres optiques : application, etude de l'influence du rayon de courbure sur le mode de propagation d'une fibre optique monomode." Université Louis Pasteur (Strasbourg) (1971-2008), 1986. http://www.theses.fr/1986STR13186.
Full textShodjaie, Afsané. "Contribution à l'étude de la propagation de la lumière dans les fibres optiques application, étude de l'influence du rayon de courbure sur le mode de propagation d'une fibre optique monomode /." Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb376011884.
Full textMorana, Adriana. "Gamma-rays and neutrons effects on optical fibers and Bragg gratings for temperature sensors." Phd thesis, Université Jean Monnet - Saint-Etienne, 2013. http://tel.archives-ouvertes.fr/tel-01064993.
Full textJauzein, Vincent. "Étude de la microstructure et du comportement mécanique de la fibre de soie." Phd thesis, École Nationale Supérieure des Mines de Paris, 2010. http://pastel.archives-ouvertes.fr/pastel-00540941.
Full textPierre, Philippe. "Dispositif optoélectronique utilisant une fibre optique en polymère pour la détection des rayons X. Application au diagnostic des états de surface des électrodes d'un dispositif haute tension sous vide." Toulouse 3, 1996. http://www.theses.fr/1996TOU30045.
Full textBrichard, Benoît. "Systèmes à fibres optiques pour infrastructures nucléaires : du durcissement aux radiations à l'application." Montpellier 2, 2008. http://www.theses.fr/2008MON20182.
Full textDassi, Carhel. "La fibrinographie : une méthode multi-longueurs d’ondes pour la détermination de la structure du caillot en plasma." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAS028.
Full textThe physiological role of the clot is to avoid excessive bleeding in the presence of a vascular breach. Once this function is filled, the clot must be able to be easily destroyed, so that it is not transported in the venous system and does not hamper blood circulation. The formation of a fibrin clot and its lysis are key processes of hemostasis, implying simultaneously the polymerization of the fibrinogen monomers in a fibrin fibers network, and the destruction of this constituted network.Although this network controls the physical and mechanical properties of the clot, its structure at scales smaller than the micron is poorly characterized. The main problem in the physical characterization of clot in clinical settings is the current absence of a quantitative, sensitive and reproducible measurement method.We demonstrated in this work, thanks to our method using several wavelengths, that the analysis of the visible spectra of light transmitted through a clot allows to determine simultaneously, quantitatively and in quasi-physiological conditions, several essential parameters of structure of the fibrin clot, namely the number of protofibrils per fibrin fibers, the radius and the density of fibers, and various times of clotting and lysis of the clot. This method was validated by the results with CV inferior to 6 % under all test conditions and various plasmatic profiles: normal, hypo / hyper coagulant and hypo / hyper fibrinolytic. This demonstrates the robustness and reliability of the measurement method when measuring both clotting and clot lysis.This spectrophotometric method was implemented on a modified automaton dedicated to diagnosis of patients presenting hemostatic disorders. The clinical information and the interests expected from this new test concern at the same time the quality of the fibrin network, its accelerated lysis or its resistance to fibrinolysis, and the resultant of the coagulo-lytic balance
Sabatier, Laura. "Étude des conséquences de traitements physiques sur le cheveu, de l’échelle moléculaire à celle de la fibre." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASS076.
Full textThermomechanical hair styling is preferred by users for easy and temporary reshaping of hair. However, the result is not always up to expectations, particularly due to poor shape stability over time and possible hair damage. In this work, we aim to improve hairstyling devices. To this end, we need to understand the effects of such treatments on hair in order to determine conditions which allow the best shape holding while minimizing hair damage. To achieve this, we use tensile testing, X-ray diffraction and infrared spectroscopy experiments. First, we studied the structural organization of natural hair. We highlighted a “core-skin” distribution of structures with a regular core which is all the more off-centered as curvature is high. Subsequently, we identified the main parameters of thermomechanical reshaping: temperature, stress and application time. Then, we evaluated the effects of these parameters on mechanical behavior and hair nanostructure. Our study shows that applied stress is a key factor: we defined stresses range allowing preservation of hair structure and its mechanical properties and the one leading to degradation or even driving to beta-sheets transition. Efficiency of the different treatment conditions in producing long-lasting shape over time was then evaluated. In addition, we analyzed the structural mechanisms that occur during stretching for native and pretreated hair: we used X-ray microdiffraction coupled with continuous stretching of hair. Consequently, we were able to monitor a beta sheet structure in hair during stretching. The original results obtained during this work, bridging internal molecular mechanisms and macroscopic behavior of hair, will allow to develop new thermomechanical treatments at industrial scale
Labaye, François. "Amplification passive d'un laser à fibre optique dans une cavité Fabry-Perot : application à la production de rayonnement gamma par diffusion Compton inverse." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00837822.
Full textUhry, Cyril. "Optimisation du procédé de tomographie X appliqué à la détection des défauts dans les matériaux composites." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEI083/document.
Full textThe carbon-fiber-reinforced-polymer (CFRP) materials display excellent properties considering their weight. However, they also can display defects that can significantly decrease their properties. In order to verify the internal structure of the composite materials, non destructive control is required. In this document, the X-ray computed tomography is used. Nevertheless, the distinction of the defects is difficult because of the chemical proximity between the carbon and the resin. In order to improve the detection of the defects, this document proposes to study the different physical phenomena happening during the tomography process such as the study of the acquisition parameters and the phenomena that decrease the image quality. In order to help to understand the different phenomena, the simulation tool is used. It allows to study the different phenomena independently to the others. After the presentation of the composite materials and the x-ray computed tomography in the first part, the features of the used acquisition system are presented in the second part. The features of the simulation of the acquisition system are also presented. The third part propose a study of the different phenomena contributing to the image. The comparison of the results between the simulation and the experimental allows to highlight a backscattering phenomenon happening inside the detector. A protocol allowing to determine these phenomena experimentally and to add it on the computed projections is presented. Furthermore, the simulation does not take the noise on the projection into account. Another protocol is presented, allowing to determine it experimentally. The fourth part displays the study of the optimization of the image quality using the simulation. The choice of the accelerating voltage is studied as well as the influence of the object scatter radiation. The fifth part proposes an experimental validation of the results. Especially, a correction of the backscattering is presented and applied to the composites objects
Harmouchi, Mohamed. "Étude des transitions de formes A-B et B-C dans les ADN en fibres et effets de tensions mécaniques : Diffraction des RX et microscopie optique." Nancy 1, 1989. http://www.theses.fr/1989NAN10178.
Full textHergott, Jean-François. "Optimisation de la génération d'harmoniques d'ordre élevé et application à l'interférométrie UVX résolue en temps." Phd thesis, Université Paris Sud - Paris XI, 2001. http://tel.archives-ouvertes.fr/tel-00081880.
Full textDans une première partie, nous présentons une étude approfondie de l'optimisation du flux harmonique produit soit dans une fibre creuse soit dans un jet. Dans chacun des cas, nous déterminons les facteurs limitant l'émission : accord de phase, absorption, ionisation, défocalisation. La comparaison des profils d'émission avec les simulations démontre le rôle crucial de la phase du dipôle atomique pour la génération dans une fibre. L'optimisation dans un jet conduit à des efficacités de conversion allant de 10-5 à 50nm (1010 ph/imp) à 10-7 à 15nm (5.107 ph/imp).
Dans une deuxième partie, nous étudions la focalisation du rayonnement harmonique par une lentille de Bragg-Fresnel, qui permet une focalisation efficace hors axe, sans aberration. Nous mesurons pour l'harmonique 39 une tache focale de l'ordre de 2µm. Compte tenu du flux élevé et de la courte durée (femtoseconde) des harmoniques, des éclairements élevés dans l'UVX peuvent être atteints.
Finalement, nous présentons les premières expériences de diagnostic de plasma par interférométrie UVX utilisant le rayonnement harmonique. Une technique originale est développée à partir de 2 sources harmoniques mutuellement cohérentes séparées spatialement. L'analogue temporel de l'interférométrie spatiale, qui utilise 2 impulsions harmoniques séparées en temps, est également démontré. Cette interférométrie fréquentielle a permis le premier diagnostic UVX de l'évolution temporelle d'un plasma avec une résolution femtoseconde. Une extension du schéma de 2 à 4 impulsions permet de mesurer avec une sensibilité extrême un déphasage équivalent à une demi-période harmonique, soit des écarts temporels à l'échelle attoseconde (1as=10-18s).
Laurencin, Tanguy. "Étude de la rhéologie des suspensions de fibres non-newtoniennes par imagerie et simulation numérique 3D à l'échelle des fibres." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAI013/document.
Full textThis study focuses on the processing of short fibre-reinforced polymer composites. The physical and mechanical properties of these materials are mainly affected by the position and orientation distribution of fibres induced during their forming. Thus, we analysed the flow-induced micro-mechanisms that arose at the fibre scale during the forming stage of these complex systems which behave as non-Newtonian fibre suspensions. For that purpose, an original approach was developed by combining 3D imaging technique and direct numerical simulation, both performed at the fibre scale. Hence, several model fibre suspensions with a non-Newtonian suspending fluid and with a concentration regime that ranged from dilute to concentrated were prepared . They were subjected to confined lubricated compression loadings using a rheometer mounted on a synchrotron X-ray microtomograph. Thanks to very short scanning times, 3D images of the evolving fibrous microstructures at high spatial resolution were recorded in real-time. These experiments were also simulated using a dedicated Finite Element library enabling an accurate description of fibre kinematics in complex suspending fluids thanks to high performance computation, level sets and adaptive anisotropic meshing. The efficiency of the numerical simulation from the dilute to semi-dilute concentration regimes was assessed through experimental and numerical comparisons.Then, we showed that the confinement effect and the non-Newtonian rheology of the suspending fluid had a weak effect on the fibre kinematics, if the fibres were sufficiently far from the compression platens, typically the fibre-platen distance should be larger than twice the fibre diameter. Otherwise, confinement effects occurred. Some extensions of the dumbbell model were proposed to correct the fibre kinematics in this flow conditions. In semi-dilute concentration, deviations of the fibre kinematics compared to the Jeffery’s predictions were also observed and related to hydrodynamic interactions between fibres. In this case, the predictions of Jeffery’s model and the related assumption of affine fibre motions are less relevant. In the concentrated regime, even if the overall orientation of fibre suspension could be astonishingly well described by using the Jeffery’s model, strong fluctuations on each fibre motion and rotation were observed. These deviations were induced by the numerous fibre-fibre contacts, which could be correctly predicted by the tube model
Gogoli, Komlavi. "Contribution à l'étude des faisceaux de fibres de lin : analyse des relations morphologie-comportement mécanique-ultrastructure." Thesis, Normandie, 2022. https://tel.archives-ouvertes.fr/tel-03789637.
Full textIn order to reduce the ecological impact of industrial processes, there is a growing interest in the industry for plant fibres. Indeed, in addition to being biodegradable, these fibres have remarkable mechanical properties, making them very competitive with synthetic fibres. However, the use of plant fibres is currently limited, in particular by the variability observed in their mechanical properties. In addition, these fibres have a non-linear mechanical behaviour that needs to be elucidated. In this context, this work proposes in a first part to study the influence of the morphology of flax fibre bundles on their mechanical behaviour. The results reveal a strong heterogeneity in the morphology and a dependence of the tensile mechanical behaviour on morphological parameters such as the twisting of the samples, the state of the middle lamellae or the cross-section. In a second part, an X-ray diffraction characterisation of the flax ultrastructure is proposed to improve the understanding of the non-linear mechanical behaviour of flax fibres. The use of the so-called combined analysis << structure/microstructure/texture >> approach for the X-ray diffraction data fit allows the determination of the Micro-Fibrillar Angle distribution and the shape of the cellulose crystallites. This method then made it possible to follow the evolution of the ultrastructure of flax fibres under tensile loading. Finally, this allowed us to propose a scenario that could explain the non-linear mechanical behaviour of flax fibres
Clair, Bruno. "Enquête sur le comportement paradoxal du bois de tension." Habilitation à diriger des recherches, Université Montpellier II - Sciences et Techniques du Languedoc, 2009. http://tel.archives-ouvertes.fr/tel-00818173.
Full textValle, Orero Jessica. "Dynamics and thermal behaviour of films of oriented DNA fibres investigated using neutron scattering and calorimetry techniques." Phd thesis, Ecole normale supérieure de lyon - ENS LYON, 2012. http://tel.archives-ouvertes.fr/tel-00734670.
Full textLu, Yi-chun, and 陸薏存. "Rayon-based Carbon Fiber Adsorbent Modified by Supporting Silver." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/qfcp2v.
Full text國立臺灣科技大學
高分子系
94
This study examines the properties and microstructure of viscose rayon-based activated carbon fiber (ACF) adsorbent modified by supporting silver. Carbon fiber with different pore characteristics is prepared using different active gas, followed by spraying and decomposition of silver. The effect of variation in decomposition temperature and reaction time on the chemical properties and microstructure of ACF-Ag adsorbent are investigated. In addition, the antibacterial ability and absorption of volatile organic compounds(VOCs) of the ACF-Ag adsorbent are also measured. Experimental results show that carbon fiber activated by steam and air has more mesopores and larger BET specific surface area. In addition, the crystals thus formed are thicker and of a denser structure with relatively higher true density values. The ratio of the oxygen containing functional groups is also higher. Among the functional groups of ACF-Ag, the peak value of the carbonyl function group will increase, and so will the peak value of alcohol and ether. Comparing between ACF adsorbent before and after silver depositing shows that ACF-Ag adsorbent have lower isotherm, leas BET specific surface area and smaller mean pore diameter. The weight of volatile organic compounds adsorbed by ACF adsorbent before silver depositing reaches a maximum of 93.15% while the maximum adsorption of volatile organic compounds by ACF-Ag adsorbent reduces significantly to 45.44 as a result of increased silver content. Different ACF-Ag adsorbent all show effective antibacterial and sterilizing properties. The elution of Ag+ from ACF-Ag adsorbent placed in deionized water for 96 hours decreases gradually. After 168 hours, the maximum Ag+ eluted is only 0.3597 ppm.
Ling, Chen Yan, and 陳妍伶. "Study of Depositing Silver Particles on Rayon Fiber Fabrics." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/46357792063530429407.
Full text逢甲大學
材料科學與工程學系
104
Silver-impregnated rayon fiber fabric was prepared by immersing the fabric in NICHING silver solution (AW-01). This study discussed the effects of the solution with varied silver concentrations (50, 200, 300, and 400 mg/L) and different lengths of the silver solution immersion period (1, 10, and 60 minutes), under a fixed liquid ratio and room temperature, to the silver contents of the rayon fiber fabric. The antibacterial activities of the silver-impregnated rayon fiber fabric were also evaluated. Results showed that, under a fixed liquid ratio, the silver contents of the rayon fiber fabric were increased with the silver concentrations of the NICHING silver solution and the lengths of the silver solution immersion period. The rayon fiber fabric impregnated with 2.02 mg/cm2 of silver exhibited antibacterial activities against Escherichia coli and produced a clear zone of inhibition 3 mm in diameter.
Chen, Chiau-Yu, and 陳巧妤. "Effect of PET/Rayon Fiber Blending Ratio on the Hygroscopicity of Spunlace." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/97091711479833050555.
Full text中國文化大學
紡織產業研發碩士專班
99
In this study, the water absorption of spunlace nonwoven composed of rayon and polyester fiber were evaluated. The effect of water absorption was analyzed by the liquid absorptive capacity, liquid wicking rate, and diffusion area. On the other way, basis weight and construction were also analyzed. According to the results, the tensile strength was in direct ratio to the polyester fiber radical, basis weight, and density. Additionally, thickness was in direct ratio to the fiber radical, and liquid absorptive capacity was in inverse ratio to the basis weight. Finally, the 70%R had the optimal water absorption and softness, 991% of liquid absorptive capacity, 8.05 cm (machine direction, MD) and 6.6 cm (cross direction, CD) of liquid wicking rate at 90 sec, and 1161.14 mm2 of diffusion area. Generally speaking, the 50%R had reached the required physical property and water absorption. For this reason, the physical property and water absorption of different basis weight were evaluated. When the mixture ratio was 50%Rayon/50%PET and 40 gsm of basis weight, the liquid absorptive capacity, softness of MD, and softness of CD were 983%, 4.8 cm, and 1.98 cm. The better diffusion area was 1178.03 mm2 while the basis weight was 50 gsm. At the 60 gsm of basis weight, the liquid wicking rate of MD and CD were 7.7 cm and 5.5 cm at 90 sec. When the PET fiber was X cross section, the liquid wicking rate of MD and CD showed increase of 0.45 cm and 1.6 cm, and the liquid absorptive capacity increased 1.07-fold.
Wang, Chi-Ming, and 王麒銘. "A study of the Rayon-based activated carbon fiber used in supercapacitor electrodes." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/22944769220314469180.
Full text國立臺灣科技大學
材料科學與工程系
101
This study used rayon woven fabrics as the raw material of activated carbon fabrics (ACFs), which are manufactured by oxidation engineering, carbonization engineering and activation engineering in a continuous semi-open high-temperature furnace. Firstly, the activated carbon fabricare prepared from two specific manufactured condition: (i) the ACFs are manufactured by difference production rate10 cm/min、15 cm/min、20 cm/min and 80 ml/min steam activator at 1000℃, (ii) the other hand, the ACFs are prepared by difference flow rate of steam activator 80 ml/min、120 ml/min、160 ml/min and 10 cm/min production rate at 1000?aC. Then, the ACFs’s electrochemical prosperities are evaluated by three-electrode device. The experiments results (i) show the specific surface area and electrical capacitance would be higher as decrease production rate. The results (ii), which offers higher flow rate of steam activator, the specific surface area and mesopores ratio of ACFs are increased resulting in higher value of electronic conductivity. The activated carbon fabrics prepared at manufactured condition at 160 ml/min with 10 cm/min production rate, obtained specific surface area 2332.1m2/g, mesopores percentage 78.7%, which shows 430.4 F/g at low rate charge (5 mV/s) and the 60% capacitance rotation at high rate charge (100 mV/s).
Han-Hui, Chen, and 陳翰輝. "The Competitive and TransformingStrategies for Taiwan’s Chemical Fiber Industry -A study of Formosa Chemicals & Fiber Corporation Rayon Division." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/40877298413831256591.
Full text淡江大學
國際貿易學系碩士在職專班
92
In recent years, the development of science and technology has brought rapid changes in the external environment, resulting in continual impact on different industries. Especially traditional industries, they have to face many difficulties in their businesses, such as continuously increased cost, and more and more industries relocating abroad. Therefore, traditional industries have reached a critical point where they have to transform themselves in order to survive. Determining how to carry out transformation themselves and what the proper policies are that should be taken are important problems for traditional industries at present. The chemical fiber industry is important to people’s livelihood. As natural cotton is limited in planting area, and its production is also affected by recent environment pollution and greenhouse effect. Therefore, the chemical fiber industry will become more and more important as people’s living standards improve and functional requirements for fibers become more different and diversified. In the chemical fiber industry system, Rayon Fiber needs high investment, high technology and has a high threshold. In Taiwan, it is only produced by Formosa Chemicals & Fiber Corp. This company even monopolizes Rayon Fiber production in the world. However, in recent years it has to face low cost competition from Southeast Asia and increased cost for wood pulp material. At present, the company is under the pressure of high operation costs and threatened by price competition in the same industries of many Southeast Asian countries. This research will focus on how to take proper measures to adjust to a deteriorated external environment and cater to enterprise transformation and adopt business strategies to ensure enterprises’ competitive advantages as they face rapid decline in the domestic textile industry and the pressure of international competition. This research will make use of professor Porter’s five-forces analysis, value chain theory analysis and SWOT analysis, and combine these analyses with professional opinions and information obtained from discussion and interviews. Thereby, presenting a conclusion about where the advantages of the rayon fiber industry are, and make suggestions on transformation and competition strategies to cater to external environment change. These are divided into (1) Product differentiation strategy; (2) Excellent Brand strategy; (3) Low cost strategy; and (4) Reinforcing sale strategy. The research is carried out with the hope that Taiwan’s rayon fiber industry will successfully carry out transformation and continue to develop forever.
Yeh, Ju-Hsiang, and 葉如翔. "A study on The Performance of Viscose Rayon Based Carbon Fiber Adsorbents and Plasma Modification." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/15780842577217820239.
Full text國立臺灣科技大學
纖維及高分子工程系
89
This study investigates the performance of the carbon fiber adsorbent and its modification, as well as the practicability in application of liquid and gas adsorption. In this work, we preceded the production of carbon fiber fabric (CAF) based on the viscose rayon knitted fabrics as the precursor and pretreated fabrics with the composite flame retardant of Ammonium Sulfate ((NH4)2 SO4) and Ammonium Phosphate Dibasic ((NH4)2HPO4) with the blend ratio of 95: 5. The process of oxidize, carbonization and activation engineering was completed within the self-designed continuous semi-open high temperature equipment. For high performance of the carbon fiber adsorbents, the production conditions have to be changed according to the concentration of the composite flame retardant (40%, 35%, 30%, 25% and 20%), flow rate of the activated gas (100c.c/min), production rate (20 cm/min) and flame retardant gas (N2). Besides, we evaluated the CAF quality with the Colorimeter analysis, physical property test and adsorption isotherms of nitrogen at 77 oK to realize the CAF practicability in application of liquid and gas adsorption. The results showed that using 30% concentration of pretreatment reagent, 200ml/min flow rate of steam as the activator and 100cc/min flow rate of gas N2 as flame retardant are the optimum production conditions. This combination results in the higher BET surface area, better adsorption performance and higher weigh yield. Nevertheless, the experimental results showed that by using the chemical reagent washing we can hardly completely remove the reminder, and by using the ultrasonic cleaner treatment, we can decrease 60% remainder of Carbon fiber adsorbent, Both the two are all in the demand of the world water standard. The later can save the cost, waste time, manpower and energy, and have a continuous process. For the unapparent absorbency of the carbon monoxide, we preceded the plasma finish based on the copper ion, silver ion and/or chromium ion as the coating agent. In conjunction with the SEM surface observation, EDS element analysis and VOCs adsorption system analysis, we evaluate the effect of the modification of the plasma finish. The results revealed that we could obtain the better effect with the plasma finishing based on the Cr ion carried by CO, and its adsorption capability of CO increased up to about 758%
Lee, Cheng-yung, and 李正湧. "Preparation of Viscose Rayon Based Carbon Fiber Adsorbents and Modification by Sputtering Silver with Plasma." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/dh3qj8.
Full text國立臺灣科技大學
高分子系
94
This study concerns the preparation of activated carbon fiber (ACF) adsorbents with antibacterial ability, and changes in properties of that modified by sputtering silver. Viscose rayon-based knitted fabrics is used as the precursor and pre-treated by a composite flame retardant of ammonium sulfate ((NH4)2SO4) and ammonium phosphate dibasic ((NH4)2HPO4) mixed at a ratio 95:5. It then undergoes oxidation, carbonization and activation processes in a semi-open high-temperature erect furnace with three types of activating agents, namely (1) steam + N2, steam + air (N2/O2), and (3) steam +N2/H2, to produce ACF adsorbents with different pore characteristics. Tests using absorption isotherms of nitrogen at 77k and colorimeter reveals that ACF-Ag adsorbents with maximum BET specific surface area becomes antibacterial. Experimental results show that ACF adsorbents activated by steam + air (N2/O2) has the largest BET specific surface area of 1713 m2/g and have the maximum absorption amounts (100.5%) of CCl4. However, the BET specific surface area of ACF-Ag adsorbents decreased because pores were destroyed by etching and deposition of silver particles. Different ACF-Ag adsorbents all show effective antibacterial and sterilizing properties. When placed in deionized water, a large amount of Ag ions elute within the first 48 hours. The elution decreases gradually after 96 hours with the maximum Ag ions eluted after 168 hours ranging between 0.2855 and 0.4294 ppm.
SHIWANGI, HIMANSHU. "MULTI-DECONTAMINATION COMPOSITE WIPE AGAINST CBR AGENTS." Thesis, 2016. http://dspace.dtu.ac.in:8080/jspui/handle/repository/14652.
Full textPENG, CHAO-CHUN, and 彭兆群. "Study of Viscose Rayon Based Carbon Fiber Adsorbents Modified by Supporting Silver and Its Physical and Chemical Properties." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/ha2n2u.
Full text國立臺灣科技大學
材料科學與工程系
99
This study concerns the preparation of activated carbon fiber (ACF) adsorbents with antibacterial ability. Viscose rayon-based knitted fabrics is used as the precursor and pre-treated by a composite flame retardant of ammonium sulfate ((NH4)2SO4) and ammonium phosphate dibasic ((NH4)2HPO4) mixed at a ratio 95:5. It then undergoes oxidation, carbonization and activation processes in a semi-open high-temperature erect furnace with three types of activating agents, namely (1) steam + N2, steam + air (N2/O2), and (3) steam +N2/H2, to produce ACF adsorbents with different pore characteristics. The ACF adsorbents were modified by supporting silver for physical and chemical method and ACF-Ag adsorbents were produced with antibacterial. It is applied etching and deposition of silver for physical methodis. It is followed by spraying and decomposition of silver regarding to chemical method. The effect of variation on the silver particle distribution of surface, distribution of pore size, surface chemical properties, microstructure and the absorption of volatile organic compounds (VOCs) of ACF and ACF-Ag adsorbents are investigated. In addition, the antibacterial ability and Ag+ elution of the ACF-Ag adsorbent are also measured. Experimental results show that carbon fiber activated by steam and air has more mesopores and largest BET specific surface area (1713 m2/g) and the maximum absorption amounts (100.5%) of CCl4. In addition, the crystals thus formed are thicker and of a denser structure with relatively higher true density values. The ratio of the oxygen containing functional groups is also higher. However, the BET specific surface area of ACF-Ag adsorbents decreased because pores were destroyed by etching and deposition of silver particles. Among the functional groups of ACF-Ag by spraying and decomposition of silver, the peak value of the carbonyl function group will increase, and so will the peak value of alcohol and ether. ACF-Ag adsorbent have lower isotherm, less BET specific surface area and smaller mean pore diameter. The adsorption of volatile organic compounds by ACF-Ag adsorbent reduces significantly as a result of increased silver content. Different ACF-Ag adsorbent all show effective antibacterial and sterilizing properties. The elution of Ag+ from ACF-Ag adsorbent placed in deionized water for 96 hours decreases gradually. After 168 hours, the maximum Ag+ eluted is only 0.2855~0.4294ppm ppm.
SHIWANGI, HIMANSHU. "MULTI-DECONTAMINATION COMPOSITE WIPE AGAINST CBR AGENTS." Thesis, 2016. http://dspace.dtu.ac.in:8080/jspui/handle/repository/14826.
Full text"Clinical cancer diagnosis using optical fiber-delivered coherent anti-stokes ramon scattering microscopy." Thesis, 2012. http://hdl.handle.net/1911/70246.
Full textCHEN, GUO-HUA, and 陳國華. "A study on the spinning of flame retardant rayon fibers by the viscose process." Thesis, 1986. http://ndltd.ncl.edu.tw/handle/62980970304427610717.
Full textDao, Lan Thuy. "Properties of wet-and dry-laid sheets from rayon, polyester and kraft pulp fibers." 1988. http://catalog.hathitrust.org/api/volumes/oclc/19055058.html.
Full textTypescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 70-72).
ZHU, SHI-LIN, and 朱時霖. "The study on the spinning of rayon fibers from bagasse cellulose by the viscose method." Thesis, 1988. http://ndltd.ncl.edu.tw/handle/63931367084704732552.
Full textLewarne, Alicia Clare. "Identification and characterization of rayon in women's dresses of the 1920s and 1930s." Master's thesis, 2009. http://hdl.handle.net/10048/512.
Full textTitle from pdf file main screen (viewed on July 16, 2009). "A thesis submitted to the Faculty of Graduate Studies and Research in partial fulfillment of the requirements for the degree of Master of Science in Textiles and Clothing, Department of Human Ecology, University of Alberta." Includes bibliographical references.
Bairagi, Nilanjana. "Studies on dyeability and antimicrobial property of cationic additive modified viscose rayan fibers." Thesis, 2007. http://localhost:8080/xmlui/handle/12345678/3905.
Full textLaplante, Caroline. "Évolution des défauts dans les fibres optiques irradiées." Thèse, 2017. http://hdl.handle.net/1866/21296.
Full textQuinaud, Manuelle. "Etude structurale et fonctionnelle de PscE:PscF:PscG, un hétérotrimère nécessaire à la biogenèse de l'aiguille de sécrétion de type III chez Pseudomonas aeruginosa." Phd thesis, 2007. http://tel.archives-ouvertes.fr/tel-00182833.
Full textDans le cytoplasme bactérien, la protéine PscF qui forme l'aiguille de type III chez P. aeruginosa est stabilisée avant sa sécrétion par 2 chaperonnes distinctes; PscE et PscG. Ceci est nécessaire à la fonctionnalité du système de sécrétion de type III.
La structure cristallographique à 2.0A de résolution du complexe hétérotrimérique PscE:PscF55-85-PscG révèle que le domaine C-terminal de la protéine de l'aiguille PscF, impliqué dans le processus de polymérisation, est enfoui dans une cavité hydrophobe de la protéine PscG repliée de façon semblable à un domaine TPR. Ceci montre que le repliement macromoléculaire nécessaire pour stabiliser la protéine de l'aiguille de type III est différent de celui décrit chez le pilus de type IV et le flagelle. Les résidus qui précèdent l'hélice C-terminale de PscF sont maintenus dépliés par des interactions hydrophobes avec PscG. Ainsi, avant sa sécrétion, PscF est maintenue partiellement dépliée par ses chaperonnes. Elle transiterait ensuite sous forme partiellement dépliée à travers l'aiguille avant de se replier lors de sa polymérisation.
La rupture des interactions spécifiques entre PscG et PscF entraîne une nette baisse de la cytotoxicité de la bactérie envers une lignée de macrophages, ce qui indique que cet hétérotrimère essentiel, qui possède des homologues chez une grande variété de pathogènes, est une cible thérapeutique attractive pour le développement de nouveaux médicaments.