Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 71 for “"glass fibers"”.
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Multifunctionality in epoxy/glass fibers composites with graphene interphase
… effect of a graphene interphase in epoxy/glass fibers composites was investigated by coating glass fibers (GF) with graphene oxide (GO) and reduced graphene oxide (rGO) nanosheets by an electrophoretic deposition (EPD) technique. Graphite oxide was prepared using modified Hummers method in …
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High Power Sources Near 0.9 Micrometers in *Oxide Glass Fibers
… 0.9 mum has not been successful to date. Optical fibers doped with neodymium offer a promising approach to the realization of this wavelength region. This thesis investigates the feasibility of using the 4F3/2 → 4I9/2 transition in Nd-doped oxide glass fibers both theoretically and …
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Nozzle analysis and heat transfer model for spray cooling of glass fibers
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1998.
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Investigation of High-Nonlinearity Glass Fibers for Potential Applications in Ultrafast Nonlinear Fiber Devices
… communication systems. They usually require long fibers to generate sufficient nonlinear phase shifts, since nonlinearities of conventional silica-core silica-clad fibers are too low. These long devices, however, cause the serious problems of pulse walk-off, pulse broadening, and polarization …
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The Dynamic Behavior of a Concentrated Composite Fluid Containing Non-Brownian Glass Fibers in Rheometrical Flows
… transient rheological behavior of a 30 wt% short glass fiber-filled polybutylene terephthalate was performed using the CP-D. Stress growth measurements during startup of flow were performed in combination with direct measurement of the fiber orientation to determine the relationship between the …
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Experimental Evaluation and Simulations of Fiber Orientation in Injection Molding of Polymers Containing Short Glass Fibers
… to produce small shadows where fibers recede into the matrix. These images were used to measure fiber orientation with a customized image analysis tool. This tool contains several modifications that we introduced in the method of ellipses which allow us to determine …
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Assessing an Orientation Model and Stress Tensor for Semi-Flexible Glass Fibers in Polypropylene Using a Sliding Plate Rheometer: for the Use of Simulating Processes
Great interest exists in adding long fibers into polymeric fluids due to the increase in properties associated with the composite, as compared to the neat resin. These properties, however, are dependent on the fiber orientations generated during processing, such as injection molding. In an effort …
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Understanding the Effect of Sizing and Cellulose Nanocrystals on S2 Glass Fiber Sheet Molding Compounds
Glass Fiber Reinforced Polymers (GFRPs) are increasingly more ubiquitous as research continuously pushes the limits of their mechanical performance. Excellent mechanical properties and low density coupled with increased ease of processibility are what distinguishes GFRPs over metallic materials. …
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Assessment of dielectric models and their application to polymer matrix composites
… of the spheres into the structure, E-glass fibers, at low fiber volume fraction, were added. The dielectric response of the epoxy-ceramic spheres-glass fibers system was studied, and it was found that this type of composite structure can be used to produce materials with tailored …
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Interface durability of externally bonded GFRP to normal and high-performance concrete
Externally bonded glass fiber-reinforced polymer (GFRP) fabrics are being increasingly used for seismic retrofit and rehabilitation of concrete structures. Glass fibers exhibit high strength to weight ratio and low cost in comparison to carbon and aramid fibers. However, previous studies have shown …
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Investigation of Waterborne Epoxies for E-Glass Composites
… replacement for solvent cast epoxies in E-glass laminated printed circuit boards. This research has revealed that the viscoelastic behavior of the cured epoxy is altered when serving as the matrix in a glass composite. The additional constraining and coupling of the E-glass fibers to the …
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Degradation of High Voltage Glass Fiber-Reinforced Polymer Matrix Composites by Aggressive Environmental Conditions
… matrix composites reinforced with either E glass or ECR glass fibers-reinforced are used in a variety of high voltage electrical applications because of their advantages like lower weight and cost. However, they can be damaged by aggressive in-service conditions such as high temperature, …
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Phase Relations in the YBa2Cu3O7-x - SiO2 System and the Impact on Superconducting Fibers
… study of the reaction phases within YBCO glass fibers, heat-treated YBCO+SiO2 pellets, rapid thermally annealed YBCO+SiO2 rods and rapid thermally annealed YBCO powder inside a fused silica tube is provided. These analyses are based on a vast set of generated novel results obtained using …
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Photosensitivity and Photodarkening of UV-induced Phosphate Glass Fiber Bragg Gratings and Application in Short Fiber Lasers
Phosphate glass fiber is an ideal choice for building compact high gain fiber lasers, as the fiber can host high concentrations of rare earth ions. However, the low photosensitivity of phosphate glass fibers prevents the integration of UV-written intra-core fiber Bragg gratings (FBGs) into the …
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Borate based bioactive glass scaffolds for hard and soft tissue engineering
… dissertation were to evaluate bioactive borate glass scaffolds for hard and soft tissue applications and determine the potential toxicity of the borate glasses on the adjacent and systemic tissues. Porous randomly oriented fiber scaffolds composed of bioactive borate glass were implanted in …
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Application of microperforated elements in axial fan noise control and silencer design
… material, which could replace the traditional glass fibers and other porous materials because of its sound absorbing characteristics in a wide frequency range. The MPP is also very useful in various human involved environments because it is less harmful to human respiratory system than …
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Extension of the Method of Ellipses to Determining the Orientation of Long, Semi-flexible Fibers in Model 2- and 3-dimensional Geometries
… and model the orientation evolution of chopped fibers in flow in order to accurately simulate the final fiber orientation distribution within injection molded parts. As a result of this, accurate and reliable experimental measurement of fiber orientation is needed. Within this research, the …
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Validation of Passive Air Sampling Monitors Onboard United States Navy Submarines
… 2-hydroxymethylpiperidine (HMP) impregnated glass fibers and 2-HMP silica gel as sorbent media, formaldehyde monitors containing adsorbing media of 2,4-dinitrophenylhydrazine (DNPH) and ozone monitors with a sorbent bed of nitrite impregnated glass fibers were evaluated. Active sampling was …
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