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Effect Of Chain Rigidity On Network Architecture And Deformation Behavior Of Glassy Polymer Networks, Kyler Reser Knowles 2017 University of Southern Mississippi

Effect Of Chain Rigidity On Network Architecture And Deformation Behavior Of Glassy Polymer Networks, Kyler Reser Knowles

Dissertations

Processing carbon fiber composite laminates creates molecular-level strains in the thermoset matrix upon curing and cooling which can lead to failures such as geometry deformations, micro-cracking, and other issues. It is known strain creation is attributed to the significant volume and physical state changes undergone by the polymer matrix throughout the curing process, though storage and relaxation of cure-induced strains remain poorly understood. This dissertation establishes two approaches to address the issue. The first establishes testing methods to simultaneously measure key volumetric properties of a carbon fiber composite laminate and its polymer matrix. The second approach considers the rigidity of ...


Geopolymer Applications And Material Specifications In Railway Industry, Sakdirat Kaewunruen 2017 University of Birmingham

Geopolymer Applications And Material Specifications In Railway Industry, Sakdirat Kaewunruen

Sakdirat Kaewunruen

Geopolymer has been developed in the past decades and its applications in civil infrastructures start to gain popularity by replacing high-carbon concrete materials with the greener material. However, the application and uses of geopolymer concrete in railway industry are not common. It is because the material design and mixture did not fully accommodate the sub-system and systemic requirements for rail operations and maintenance. In this presentation, the emphasis is placed on the promising solutions to solve the sustainability issue and applicability for geopolymer concrete in railway environments. The review of railway infrastructures and their design and operational requirements are highlighted ...


Sustainable And Self-Sensing Concrete, Sakdirat Kaewunruen, Maaninder Singh, Ange-Therese Akono, Tetsuya Ishida 2017 University of Birmingham

Sustainable And Self-Sensing Concrete, Sakdirat Kaewunruen, Maaninder Singh, Ange-Therese Akono, Tetsuya Ishida

Sakdirat Kaewunruen

The majority of civil infrastructure is constructed using concrete materials and currently concrete production is at all time high resulting in significant carbon dioxide emissions. Furthermore, concrete structures have low tensile strength and low ductility increasing the risk of failure. Therefore concrete is currently neither environmentally nor economically sustainable. In this study, the experimental investigation has been highly promising in identifying a solution to solve the sustainability issue regarding concrete. Our critical literature showed that there have been successful in identifying the most optimum solution to solve the issue of carbon dioxide emissions related to concrete production but concrete structures ...


Physical Properties Of Single Crystalline R Mg 2 Cu 9 ( R = Y , Ce − Nd , Gd − Dy , Yb ) And The Search For In-Plane Magnetic Anisotropy In Hexagonal Systems, Tai Kong, William R. Meier, Qisheng Lin, Scott M. Saunders, S. L. Bud’ko, Rebecca Flint, Paul C. Canfield 2017 Iowa State University

Physical Properties Of Single Crystalline R Mg 2 Cu 9 ( R = Y , Ce − Nd , Gd − Dy , Yb ) And The Search For In-Plane Magnetic Anisotropy In Hexagonal Systems, Tai Kong, William R. Meier, Qisheng Lin, Scott M. Saunders, S. L. Bud’Ko, Rebecca Flint, Paul C. Canfield

Qisheng Lin

Single crystals ofRMg2Cu9 (R = Y, Ce-Nd, Gd-Dy, Yb) were grown using a high-temperature solution growth technique and were characterized by measurements of room-temperature x-ray diffraction, temperature-dependent specific heat, and temperature- and field-dependent resistivity and anisotropic magnetization. YMg2Cu9 is a nonlocal- moment-bearing metal with an electronic specific heat coefficient, γ ∼ 15 mJ/mol K2. Yb is divalent and basically non-moment-bearing in YbMg2Cu9. Ce is trivalent in CeMg2Cu9 with two magnetic transitions being observed at 2.1 K and 1.5 K. PrMg2Cu9 does not exhibit any magnetic phase transition down to 0.5 K. The other members being studied (R = Nd ...


Dual Mechanism For Toughening And Sustained Aminoglycoside Elution From A Polyphosphate Hydrogel, Dwight D. Lane, Russell J. Stewart PhD 2017 University of Utah

Dual Mechanism For Toughening And Sustained Aminoglycoside Elution From A Polyphosphate Hydrogel, Dwight D. Lane, Russell J. Stewart Phd

Biomedical Engineering Western Regional Conference

No abstract provided.


Redesign Of Computer Keyboards For Hospital And Consumer Use, Kent Williams, Brian Jensen, Anton Bowden 2017 Brigham Young University - Provo

Redesign Of Computer Keyboards For Hospital And Consumer Use, Kent Williams, Brian Jensen, Anton Bowden

Biomedical Engineering Western Regional Conference

Application of carbon nanotube coatings to computer keyboards in order to reduce the spread of bacteria in hospitals and homes.

Keywords: carbon nanotube, bacteria, antimicrobial, keyboard, design, MRSA, biofilm


Engineered Crumbed Rubber Concrete For Vibroacoustic Reduction In Railway Built Environment, Sakdirat Kaewunruen, Ange-Therese Akono 2017 University of Birmingham

Engineered Crumbed Rubber Concrete For Vibroacoustic Reduction In Railway Built Environment, Sakdirat Kaewunruen, Ange-Therese Akono

Sakdirat Kaewunruen

Environmental friendly structural concrete using recycled waste tires, rubber and synthetics in structural concrete as either aggregate or filler have faced a number of challenges over the decade. The crumbed rubber concrete (CRC) was initially developed for low-profile non-structural elements such as pedestrian pathway, acoustic wall panel, and furniture due to its low strength. Although it has excellent thermal insulation property, using wasted rubber as aggregate could cause adverse effects on durability, creep and shrinkage, and abrassion resistance. Modern nanotechnology provides an opportunity for CRC modifications to improve strength while maintain high damping and good sound absorption. Experimental results show ...


Inkjet Printing Of Ag Nanoparticles Using Dimatix Inkjet Printer, No 1, Amal Abbas, Inayat Bajwa 2017 Quattrone Nanofabrication Facility

Inkjet Printing Of Ag Nanoparticles Using Dimatix Inkjet Printer, No 1, Amal Abbas, Inayat Bajwa

Protocols and Reports

Ag nanoparticle inkjet printing on polyimide and polyethylene terephthalate films has been performed using Dimatix inkjet printer at Quattrone Nanofabrication Facility. This article describes selection of Ag nanoparticle inks and reports the progress of optimization of drop spacing, drop frequency, droplet size, and waveform for high resolution features, and furthermore reveals the pros and cons of Dimatix inkjet printing. In addition, the resistivity of Ag nanoparticle line sintered was determined to be ~2.2 x 10-5 Ωm. The adhesion and bending tests indicated that Ag nanoparticle pattern sintered on PI and PET films had exceptional mechanical stability.


Effect Of Liquid Contamination On Hermeticity And Seal Strength Of Flexible Pouches With Lldpe, Francesca Delle Cese, Koushik Saha, S. Roy, Jay Singh 2017 California Polytechnic State University

Effect Of Liquid Contamination On Hermeticity And Seal Strength Of Flexible Pouches With Lldpe, Francesca Delle Cese, Koushik Saha, S. Roy, Jay Singh

Journal of Applied Packaging Research

Flexible packaging is a growing successful market and the majority of flexible package applications are for the food industry. The demand for process optimization and reduced production costs, has led to an increase in flexible packaging. However, fast production lines can result in contamination in the seal area. For flexible food packaging, contamination is considered any food particle or substance trapped in the seal area. Current quality control processes can detect contamination in the seal area, but it is not determined if seal contamination affects seal quality. Oil-based and sodium based snack foods are two common categories that can be ...


Quality Improvement In Drilling Silicon By Using Micro Laser Assisted Drilling, Barkin Bakir 2017 Western Michigan University

Quality Improvement In Drilling Silicon By Using Micro Laser Assisted Drilling, Barkin Bakir

The Hilltop Review

The micro-laser assisted drilling (µ-LAD) of monocrystalline silicon (100), using a diamond cutting tool coupled with a laser, was tested in order to improve the cutting edge quality of a drilled samples. The laser beam is transmitted through an optically transparent diamond drill bit and focused precisely at the tool-workpiece interface, where the material is under high pressure induced by the diamond tool. The influence of the laser power on the quality and the inner surface finish of the drilled materials is investigated. Different laser powers were used to carry out the experiments. The experimental results indicated that the µ-LAD ...


Computational Studies Of Grain Boundary Behavior In Uranium Dioxide Nuclear Fuels, Eric Nelson, Lan Li (Mentor), Simon C. Middleburgh (Mentor) 2017 Westinghouse Electric Company LLC

Computational Studies Of Grain Boundary Behavior In Uranium Dioxide Nuclear Fuels, Eric Nelson, Lan Li (Mentor), Simon C. Middleburgh (Mentor)

Idaho Conference on Undergraduate Research

Nuclear power is responsible for the production of 380,000 Megawatts of energy worldwide, which results in over 11% of the world’s energy production [world-nuclear.org]. Pellet-cladding interactions (PCI) are a key nuclear fuel failure mechanism which presents formidable challenges to researchers due to extreme nuclear fission conditions. Although PCI interactions have been reduced due to fuel additives, understandings of PCI interactions remain elusive. We propose new approaches to increase understanding of nuclear fuel interactions; specifically, uranium dioxide and the effects of dopants. This study focuses on amorphous uranium dioxide and fission products, while benchmarking new methods with previous ...


Cermet Development For High Temperature And High Pressure Applications, Beatriz Justus Ferez, Samantha Guthrie, Brian J. Jaques (Mentor), Darryl P. Butt (Mentor) 2017 Boise State University

Cermet Development For High Temperature And High Pressure Applications, Beatriz Justus Ferez, Samantha Guthrie, Brian J. Jaques (Mentor), Darryl P. Butt (Mentor)

Idaho Conference on Undergraduate Research

Many traditionally used low cost alloys are easily corroded in steam or supercritical CO2. An effective solution is to utilize ceramic heat exchangers that are often integrated with metallic components which result in a significant thermal expansion mismatch. The goal of this project is to develop a sealing method to create a hermetic joint between the ceramic and metal alloy. Proposed is a seal ring containing a cermet powder with a coefficient of thermal expansion (CTE) higher than the ceramic and metal to produce a high temperature compressive seal. Cermets of Ag and MgO have been selected to withstand ...


Verifying The Implementation Of An Anisotropic Grain Boundary Energy Model In Idaho National Lab’S Marmot, John-Michael H. Bradley, Evan D. Hansen, Jarin C. French, Yongfeng Zhang (Mentor) 2017 Brigham Young University Idaho

Verifying The Implementation Of An Anisotropic Grain Boundary Energy Model In Idaho National Lab’S Marmot, John-Michael H. Bradley, Evan D. Hansen, Jarin C. French, Yongfeng Zhang (Mentor)

Idaho Conference on Undergraduate Research

This work aims to verify the correct implementation of an anisotropic grain boundary (GB) energy model for face-centered cubic (FCC) and fluorite materials in Idaho National Laboratory’s phase field fuel performance code MARMOT. The model was recently implemented in MARMOT with the purpose of enabling higher fidelity simulations of UO2 nuclear fuels. As part of verification, tests were performed to measure the energy dependence on misorientation of high symmetry GBs in an FCC metal (Cu). The energies of the [100], [110], and [111] twist boundaries result as predicted, as do the energies of the [111] symmetric tilt boundaries ...


Superconductivity Versus Structural Phase Transition In The Closely Related Bi2rh3.5s2 And Bi2rh3s2, Udhara S. Kaluarachchi, Weiwei Xie, Qisheng Lin, Valentin Taufour, Sergey L. Bud'ko, Gordon J. Miller, Paul C. Canfield 2016 Iowa State University

Superconductivity Versus Structural Phase Transition In The Closely Related Bi2rh3.5s2 And Bi2rh3s2, Udhara S. Kaluarachchi, Weiwei Xie, Qisheng Lin, Valentin Taufour, Sergey L. Bud'ko, Gordon J. Miller, Paul C. Canfield

Qisheng Lin

Single crystals of Bi2Rh3S2 and Bi2Rh3.5S2 were synthesized by solution growth, and the crystal structures and thermodynamic and transport properties of both compounds were studied. In the case ofBi2Rh3S2, a structural first-order transition at around 165 K is identified by single-crystal diffraction experiments, with clear signatures visible in resistivity, magnetization, and specific heat data. No superconducting transition for Bi2Rh3S2 was observed down to 0.5 K. In contrast, no structural phase transition at high temperature was observed for Bi2Rh3.5S2; however, bulk superconductivity with a critical temperature, Tc≈1.7 K, was observed. The Sommerfeld coefficient γ and the ...


Experimental Methods And Practices For The Study Of Toroidal Inflated, Braided Fabric Members, Daniel J. Whitney 2016 University of Maine

Experimental Methods And Practices For The Study Of Toroidal Inflated, Braided Fabric Members, Daniel J. Whitney

Electronic Theses and Dissertations

Inflatable structures have become a very important area of interest for many differing applications where lightweight packable structures are required. NASA is developing Hypersonic Inflatable Aerodynamic Decelerator (HIAD) technology that takes advantage of stacked, inflated fabric tori to form a decelerating spacecraft nose cone. The tori consist of a bladder, braided fabric shell, and reinforcing in the form of integral cords or externally bonded straps. The focus of this thesis is on the development of methods for the structural testing of inflated fabric tori and developing an enhanced understanding of their behavior. This is essential for providing insight into the ...


Zirconium Diboride, Hexagonal Boron Nitride, And Amorphous Alumina Thin Films For High Temperature Applications, David Murdock Stewart 2016 University of Maine

Zirconium Diboride, Hexagonal Boron Nitride, And Amorphous Alumina Thin Films For High Temperature Applications, David Murdock Stewart

Electronic Theses and Dissertations

The use of microelectronic sensors and actuators in harsh, high temperature environments, such as power plants, turbine engines, and industrial manufacturing, could greatly improve the safety, reliability, and energy efficiency of these processes. The primary challenge in implementing this technology is the breakdown and degradation of thin films used in fabricating these devices when exposed to high temperatures >800 °C and oxidizing atmospheres. Zirconium diboride, hexagonal boron nitride, and amorphous alumina are candidate materials for use as thin film sensor components due to their high melting temperatures and stable phases. Zirconium diboride thin films have metallic-like electrical conductivity and remain ...


In Mold Flow Of Long Fibers In Compression Molding Process, Gleb Meirson 2016 The University of Western Ontario

In Mold Flow Of Long Fibers In Compression Molding Process, Gleb Meirson

Electronic Thesis and Dissertation Repository

Long Fiber Thermoplastics (LFT) are promising new materials with high physical properties and low density. These high properties are obtained by embedding very long fibers (~100 mm) into a thermoplastic matrix. Such a high fiber length dictates the use of a compression molding process for manufacturing as the length of discontinuous fibers in injection molding is limited by pellet length.

LFT composites are of great interest for the automotive industry. These materials are already used in some interior and exterior car parts such as bumpers, seat structures, door module etc. This research is inspired by the desire to manufacture load ...


Effects Of Position, Orientation, And Metal Loss On Ground Penetrating Radar Signals From Structural Rebar, David J. Eisenmann, Frank J. Margetan, Chien-Ping T. Chou, Shelby Ellis 2016 Iowa State University

Effects Of Position, Orientation, And Metal Loss On Ground Penetrating Radar Signals From Structural Rebar, David J. Eisenmann, Frank J. Margetan, Chien-Ping T. Chou, Shelby Ellis

David Eisenmann

Past experimental work on a highway bridge in central Iowa [1] suggested that ground penetrating radar (GPR) signals could possibly be used to differentiate intact rebar from those having substantial metal loss due to corrosion. That study made use of the amplitudes of GPR signals reflected by rebar, as obtained using a commercial instrument operated in pulse/echo mode. Many factors can contribute to the strength of the echo seen from a given rebar, including the rebar’s length, its distance from and tilt angle relative to the antenna, and the location and size of the metal-loss region. In this ...


Scanning Electron Microscopy Laboratory Portfolio, Gwendolyn F. Stark 2016 SUNY College of Environmental Science and Forestry

Scanning Electron Microscopy Laboratory Portfolio, Gwendolyn F. Stark

N.C. Brown Center for Ultrastructure Studies

The MCR 484 course is designed to provide students with the skills and knowledge to properly operate a Scanning Electron Microscope. In this collection are some of my best pictures from the course, as well as pictures that demonstrate the skills I have learned.


Scanning Electron Microscopy Laboratory Portfolio, Michaela Tersmette 2016 SUNY College of Environmental Science and Forestry

Scanning Electron Microscopy Laboratory Portfolio, Michaela Tersmette

N.C. Brown Center for Ultrastructure Studies

No abstract provided.


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