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 37 for “"polymethylmethacrylate"”.
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Elution of Metronidazole and Gentamicin from Polymethylmethacrylate Beads
Ten polymethylmethacrylate (PMMA) beads containing metronidazole (3 concentrations); gentamicin sulfate; or metronidazole and gentamicin sulfate were immersed in 5 ml of phosphate buffered saline in triplicate. Eluent was replaced at specified time intervals for 1 day (1, 3, 6, 12 and 24 hours), …
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Chronic Ocular Hypertensive Model using Microbead Injection in Rats: Comparison of Polyurethane, Polymethylmethacrylate, and Polystyrene
… [7- and 17-µm polyurethane (PU), 7- and 15-µm polymethylmethacrylate (PMMA), and 15-µm polystyrene (PS)] and selected the appropriate microbeads for a chronic ocular hypertensive model in terms of IOP elevation and adverse events. IOP changes were observed for 4 weeks after microbead …
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Improving Bioactivity and the Anti-Bacterial Properties of Two-Solution Bone Cement Containing Cross-Linked Polymethylmethacrylate (PMMA) Nanospheres (η-TSBC)
… two-solution cements containing cross-linked polymethylmethacrylate (PMMA) nanospheres (η-TSBC), as part of the polymer phase, were fabricated as the first step for optimization of cement viscosity for application of the material in the treatment of vertebral compression fractures using …
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Characterization of Surfactant Effects on the Visible Spectroscopy of Lanthanide Metal Ion-Triphenylmethane Dye Complexes (Microscopy, Polyvinylidene Fluoride, Electron, Polymethylmethacrylate, Blends)
Although both micellar and submicellar concentrations were considered, adding the nonionic surfactant Triton X-100 to the Gd('+3)-CAS complex had little effect.
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Strength Development at Incompatible Polymer Interfaces
… Three pairs of polymers were used: polystyrene-polymethylmethacrylate, polystyrene-co-acrylonitrile-polymethylmethacrylate, and polystyrene-co-acrylonitrile-polycarbonate. For each pair, the weld strength, as measured by G$\sb{\rm IC}$, attained a constant value which increased with welding …
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Il trattamento delle fratture e lussazioni vertebrali nei piccoli animali
… in small animals using the screws/pins and Polymethylmethacrylate technique. The analysis of results is a contribute I the valutation of surgical technique and complications in the post-surgical period.
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Experimental investigation of surface temperatures of some polymers in unlubricated sliding
… polytetrafluoroethylene, polystyrene, and polymethylmethacrylate were investigated. Effects of load and sliding speed on the friction and wear behavior of the polymers were examined. Finally, the experimental results were compared with theoretical calculations, and reasons for the …
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PROTON BEAM WRITING OF MICRO/NANO FLUIDIC DEVICES FOR DNA ANALYSIS AND PARTICLE SEPARATION
… (PDMS) through soft lithography, polymethylmethacrylate (PMMA) are very popular for micro/nanofludic fabrication because of the easy process and low cost. In this thesis, different types of molds (resist, OrmoStamp and nickel mold) were fabricated for PDMS and PMMA fluidic devices …
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The use of thin polymeric coatings to prevent fretting corrosion and metallic contact in steel-on-steel systems
… Ten polymer types were chosen for study: polymethylmethacrylate (PMMA), polytetrafluoroethylene (PTFE), polyimide (PI), polyvinylidene fluoride (PVDF), polyvinylidene chloride (PVDC), polyvinyl chloride (PVC), low-density polyethylene (LOPE), high-density polyethylene (HDPE), polysulfone …
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Development of a phosphotriesterase enzyme assay for determination of organophosphate pesticides
… isothiocyanate (FITC), was immobilized on polymethylmethacrylate beads and the pH change is monitored through the pH-sensitive quantum yield of FITC. Analytes were measured using a KinExA fluorescence analyzer. This assay can detect paraoxon concentration down to 11 {dollar}\mu{dollar}M …
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Process window and variation characterization of the micro embossing process
The micro embossing process on polymethylmethacrylate (PMMA) is demonstrated experimentally to be a useful process to produce micro fluidic and optical devices. Because this process is a one step thermoplastic deformation process, it is possible to reach high production rates and low cost in …
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Study of Immobilizing Cadmium Selenide Quantum Dots in Selected Polymers for Application in Peroxyoxalate Chemiluminescence Flow Injection Analysis
… for immobilizing in polyisoprene (PI), polymethylmethacrylate (PMMA), and low-density polyethylene (LDPE). The combinations of QDs and polymer substrates were evaluated for their analytical fit-for-use in applicable immunoassays. Hydrogen peroxide standards were injected into the flow …
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The influence of microporosity on the mechanical properties of bulk, scaffold, and composite scaffold biphasic calcium phosphate
… porosity (macro- and microporosity), and BCP/polymethylmethacrylate (PMMA) composite scaffolds with multi-scale porosity were investigated in this work. The elastic properties of bulk BCP with varying micropore size and fraction were analyzed using resonant frequency testing. The compressive …
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The abrasive wear behaviour of mineral-filled polypropylene
… of polypropylene. The wear behaviours of polymethylmethacrylate, polycarbonate, acrylonitrile-butadiene-styrene, and high density polyethylene have been determined for comparative purposes. The abrasive wear rates have been measured and the material deformation and removal mechanisms have …
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Engineered iron oxide nanoparticle-polymer composites for the removal of dissolved arsenic and antimony
… the use of magnetite (Fe3O4) nanoparticle – polymethylmethacrylate (PMMA) composites, as a reusable adsorbent toremove dissolved As andSb. Comparative experiments were carried out to examine the effectiveness ofcommercial magnetite nanoparticles, lab synthesized nanoparticles, and the …
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A hybrid approach towards on-chip visible lasers
… laser. We combined colloidal quantum dots with polymethylmethacrylate (PMMA) to create suspended polymeric cavities that showed enhanced spontaneous emission from the quantum dots. By functionalizing surfaces, we achieved orientation control of nanoplatelet αlms. We also achieved the αrst …
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An Investigation of the Mechanical Implications of Sacroplasty Using Finite Element Models Based on Tomographic Image Data
… source of acute lower back pain. A polymethylmethacrylate (PMMA) cement injection procedure called sacroplasty has recently been utilized as a treatment for sacral insufficiency fractures. It is believed that injection of cement reduces fracture micromotion, thus relieving pain. In …
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Biomechanical evaluation of two methods of surgical stabilization of the atlantoaxial joint
… acrylic pins placed ventrally together with polymethylmethacrylate (PMMA) is a well-established technique that has been widely used in clinical cases. However, Kishigami tension bands are a less technically demanding procedure with potentially fewer complications. The purpose of this study …
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The development of h Homogeneous nucleation rate model for thermoplastic foams based on a molecular partition function and Fickian diffusion
… obtained from the model have been compared to a polymethylmethacrylate/carbon system with limited success. Althoulgh the model results do not match the experimental data, there is a significant improvement over the results obtained from current models available in the literature. The data is …
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Comparison of wettability for surface of ocular prosthesis depending on different kind of artificial tear eye drops
… rectangular parallelepiped block that is made of polymethylmethacrylate (PMMA) and silicone materials has been produced. One drop of artificial tear eye drops was applied by using a 23G needle on the surface of two different blocks of artificial eyes. Then, the static method contact angle was …
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