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Articles 1 - 11 of 11
Full-Text Articles in Engineering
Cellulose Nanofibers Use In Coated Paper, Finley Richmond
Cellulose Nanofibers Use In Coated Paper, Finley Richmond
Electronic Theses and Dissertations
Cellulose Nanofibers (CNF) are materials that can be obtained by the mechanical breakdown of natural fibers. CNF have the potential to be produced at low cost in a paper mill and may provide novel properties to paper, paper coatings, paints, or other products. However, suspensions have a complex rheology even at low solid contents. To be able to coat, pump, or mix CNF at moderate solids, it is critical to understand the rheology of these suspensions and how they flow in process equipment; current papers only report the rheology up to 6% solids. Few publications are available that describe the …
The Development Of A Laminated Copolyester Electric Guitar, Addison S. Karnes
The Development Of A Laminated Copolyester Electric Guitar, Addison S. Karnes
Electronic Theses and Dissertations
This thesis is an investigation of the fabrication and assembly methodologies employed in the development of a proof-of-principle prototype electric guitar composed of laminated copolyester. The objective of the project was to develop the processes and procedures to create an optimized physical and visual bond between layers to minimize vibratory dissipation, thus maximizing sustain. A high speed CNC router, abrasive waterjet, laser engraver-cutter, as well as various manual fabrication and assembly methods were investigated in the construction of the guitar prototypes. The lamination processes explored include low-temperature, heat-assisted pressure bonding, solvent and chemical welding, and contact adhesives. The project concluded …
Fabrication Of A Thin Silver Nanowire Composite Film And Investigation Of A Patterning Technique., Richard S. Korte 1991-
Fabrication Of A Thin Silver Nanowire Composite Film And Investigation Of A Patterning Technique., Richard S. Korte 1991-
Electronic Theses and Dissertations
Electrically conductive polymers encompass an exciting field of research for applications in dye-sensitized solar cells (DSSC’s). DSSC’s possess several advantages over other types of solar cells. They offer the potential for high quantum efficiency, solar conversion efficiency approaching that of traditional silicon panels, rapid charge transfer kinetics for photo-excited electrons, mechanical flexibility, and cost efficient manufacturing processes. However, key drawbacks to their large scale production and performance lifetime lie in their reliance on costly indium tin oxide (ITO), fluorinated tin oxide (FTO), and platinum for electrode materials, and the mechanical fragility inherent to a liquid electrolyte layer component. Much of …
Phase Transformation Studies Of Metal Oxides To Dichalcogenides In 1-D Structures., Dustin Ray Cummins 1987-
Phase Transformation Studies Of Metal Oxides To Dichalcogenides In 1-D Structures., Dustin Ray Cummins 1987-
Electronic Theses and Dissertations
Recently, the use of materials with nanoscale morphologies has expanded, particularly with applications in energy conversion, catalysis, and energy storage. One drawback to single crystalline nanomaterials, especially 1D nanowires, is the difficulty in synthesizing these compounds, as the material chemistry becomes more complicated. Metal oxide nanowires can be synthesized easily and can be produced in relatively large quantities. However, more complex materials, such as metal chalcogenides, cannot typically be synthesized using facile methods, and currently very few techniques involve scalable methods. Phase transformation of metal oxides nanowires to form metal sulfides and selenides by gas-solid reactions is one viable route …
Investigation Of Stabilization Mechanisms For Colloidal Suspension Using Nanoparticles., Qingwen He
Investigation Of Stabilization Mechanisms For Colloidal Suspension Using Nanoparticles., Qingwen He
Electronic Theses and Dissertations
Over the past decade, charged nanoparticles have been found to enhance the stability of colloidal suspensions. One promising explanation of this stabilization mechanism is “Nanoparticle Haloing”- the formation of a non-adsorbing nanoparticle layer surrounding neutral colloids that would induce an effective electrostatic repulsion between them. The objective of this work was to investigate the effect of additional charged nanoparticles on the interaction between neural colloids in nanoparticle-regulated complex fluids. Firstly, colloidal probe Atomic Force Microscopy (CP-AFM) is used to directly measure the interaction force in such system with nanoparticle volume fractions varying from 10-6 to 10-2. It is found that …
An Investigation Of Heat Transfer Enhancement In Nanofluids Containing Core And Shell Nanoparticles., Cory Adam Milligan
An Investigation Of Heat Transfer Enhancement In Nanofluids Containing Core And Shell Nanoparticles., Cory Adam Milligan
Electronic Theses and Dissertations
The purpose of this research is to determine the differences in heat transfer enhancement of poly alpha olefin oil after the addition of two types of carbon coated nanoparticles, specifically carbon coated cobalt and carbon coated copper nanoparticles. The carbon shell allows for the nanoparticles to be homogenously dispersed in the oil and remain stable throughout the experimental procedure. The nanofluids were prepared in concentrations of 0.5, 1.0, and 1.5 wt%. A constant surface heat flux testing rig is used to determine the heat transfer coefficients of the base fluids and the nanofluids. Inlet temperatures to the heat transfer section …
Enhancement Of Anaerobic Digestion Of Actual Industrial Wastewaters : Reactor Stability And Kinetic Modeling., Mahyar Ghorbanian
Enhancement Of Anaerobic Digestion Of Actual Industrial Wastewaters : Reactor Stability And Kinetic Modeling., Mahyar Ghorbanian
Electronic Theses and Dissertations
Industrial plants pay disposal costs for discharging their wastewater that can contain pollutants, toxic organics and inorganics, to the sewer based on the Biological Oxygen Demand (BOD) or Chemical Oxygen Demand (COD) of the streams. It has become increasingly expensive for industry to meet stringent regulatory standards. One solution to reduce this cost is to anaerobically degrade the COD content, which in turn generates useful methane gas that can be used to generate useful energy or heat. Anaerobic Digestion (AD) is one of the most suitable renewable resources of conversion of industrial wastewaters to bioenergy, but it is not widely …
Aging Of A Polymer Core Composite Conductor Under Combined Ozone And Temperature Conditions, James M. Middleton
Aging Of A Polymer Core Composite Conductor Under Combined Ozone And Temperature Conditions, James M. Middleton
Electronic Theses and Dissertations
The next generation High Temperature Low Sag Polymer Core Composite Conductors (HTLS PCCC) can experience harsh in-service environments including high temperature and highly concentrated ozone. In some extreme cases, it is possible that the conductors will experience temperatures of up to 180°C and ozone concentrations as high as 1% (10,000 ppm). Therefore, the primary goal of this research was to determine the most damaging aging conditions which could negatively affect the in-service life of the conductors. This included characterizing the aging in ozone and at high temperature of the HTLS PCCC hybrid composite rods and neat resin. It was found …
Evaluation Of Cotton Valley "D" Sand Production In Stampede Field, Mississippi, U.S.A., Patrick Lawrence Murphy
Evaluation Of Cotton Valley "D" Sand Production In Stampede Field, Mississippi, U.S.A., Patrick Lawrence Murphy
Electronic Theses and Dissertations
No abstract provided.
The Effects Of Diffusion, Capillary Heterogeneity, And Porous Media Morphology On Co2 Migration In Porous Media, Oluseye Babafemi Adeyemi
The Effects Of Diffusion, Capillary Heterogeneity, And Porous Media Morphology On Co2 Migration In Porous Media, Oluseye Babafemi Adeyemi
Electronic Theses and Dissertations
The Modified Invasion Percolation (MIP) model was used to simulate the invasion of CO2 into a medium initially saturated with water and the style of capillary heterogeneity in combination with buoyancy and viscous forces were varied to yield 105 different simulation scenarios. Thereafter, the invasion of the CO2 gas is simulated using a finite difference model and the effective mass transfer coefficient is determined and linked to various styles of capillary heterogeneity. Results show that an increase in saturation does not result in an increase in mass transfer coefficient rather, the surface area, which in turn is controlled by the …
Pretreatment Of Cellulosic Biomass By Iron-Containing Magnetic Ionic Liquid Dissolution, Christopher Roth Riley
Pretreatment Of Cellulosic Biomass By Iron-Containing Magnetic Ionic Liquid Dissolution, Christopher Roth Riley
Electronic Theses and Dissertations
The focus of this project is to determine the effectiveness in the preprocessing of biomass when magnetic ionic liquids (MIL) (1-butyl-3-methylimidazolium tetrachloroferrate (Bmim[FeCl4]) and 1-ethyl-3-methylimidazolium tetrachloroferrate (Emim[FeCl4])) are used as a green solvent. Lignocellulose is a promising starting material for a plethora of products, ranging from biofuels to custom chemicals; however, lignocellulose is resistant to enzymatic degradation. Various biomass-preprocessing techniques such as microbial, mechanical, and chemical pretreatment are used for enhancing the digestibility of biomass to sugars for ethanol production. Varieties of ionic liquids have demonstrated the ability to fragment lignocellulose. However, after fragmentation, separation of biomass and ionic liquids …