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Materials Science and Engineering Commons™
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Articles 571 - 600 of 988
Full-Text Articles in Materials Science and Engineering
Emerging Clean Water Act Issues For Ccr Surface Impoundments, John Kondziolka, Kathleen Radloff, Andrew Bittner
Emerging Clean Water Act Issues For Ccr Surface Impoundments, John Kondziolka, Kathleen Radloff, Andrew Bittner
World of Coal Ash Proceedings
No abstract provided.
Dewatering Ash – Progress Over The Last 5 Years, Greg M. Landry, Paul C. Schmall
Dewatering Ash – Progress Over The Last 5 Years, Greg M. Landry, Paul C. Schmall
World of Coal Ash Proceedings
No abstract provided.
Towards Development Of Sustainable Asphalt Pavement Using Off-Spec Fly Ash, Ahmed Faheem, Ahmed Abdalla, Konstantin Sobolev
Towards Development Of Sustainable Asphalt Pavement Using Off-Spec Fly Ash, Ahmed Faheem, Ahmed Abdalla, Konstantin Sobolev
World of Coal Ash Proceedings
No abstract provided.
Ccr Corrective Measures Assessment & Implementation – A Technical Roadmap And Smart Communication/Management Strategies, Steven F. Putrich, David Hagen
Ccr Corrective Measures Assessment & Implementation – A Technical Roadmap And Smart Communication/Management Strategies, Steven F. Putrich, David Hagen
World of Coal Ash Proceedings
No abstract provided.
Upgrading The Properties Of Fly-Ash From Long-Term Storage, With Simultaneous Deagglomeration, Drying & Classification Using Atritor Technology, Andrew Rigg, Scott Coley, Paul Machacek
Upgrading The Properties Of Fly-Ash From Long-Term Storage, With Simultaneous Deagglomeration, Drying & Classification Using Atritor Technology, Andrew Rigg, Scott Coley, Paul Machacek
World of Coal Ash Proceedings
No abstract provided.
Lime Activated Coal Ash For Ccr Pond Closure Projects, Larry Gibson, Karen Slade
Lime Activated Coal Ash For Ccr Pond Closure Projects, Larry Gibson, Karen Slade
World of Coal Ash Proceedings
No abstract provided.
A Thermodynamic-Guided Approach To Recycle Off-Spec Fly Ash Into Lightweight Aggregate, Mohammad Balapour, Newell Moser, Edward J. Garboczi, Grace Hsuan
A Thermodynamic-Guided Approach To Recycle Off-Spec Fly Ash Into Lightweight Aggregate, Mohammad Balapour, Newell Moser, Edward J. Garboczi, Grace Hsuan
World of Coal Ash Proceedings
No abstract provided.
Beneficial Use Of Fly Ash As A Sustainable Building Material, Randall Stremmel, Thomas Weyand
Beneficial Use Of Fly Ash As A Sustainable Building Material, Randall Stremmel, Thomas Weyand
World of Coal Ash Proceedings
No abstract provided.
In-Situ Stabilization For Hydraulic Control At Ccr Sites, Paul R. Lear
In-Situ Stabilization For Hydraulic Control At Ccr Sites, Paul R. Lear
World of Coal Ash Proceedings
No abstract provided.
Study To Evaluate Future Ash Beneficial Use, Corina Maria Aldea, Gil M. Haines, Matt Bishop
Study To Evaluate Future Ash Beneficial Use, Corina Maria Aldea, Gil M. Haines, Matt Bishop
World of Coal Ash Proceedings
No abstract provided.
Coal Quality & Combustion Impacts On Ash Chemistry, Rod Hatt
Coal Quality & Combustion Impacts On Ash Chemistry, Rod Hatt
World of Coal Ash Proceedings
No abstract provided.
Real Time Pore Pressure Monitoring Of Ash And Construction-Induced Responses: The State Of The Practice, Paul C. Schmall, Chris Hardin, Kenneth Campbell, Ryan Smith
Real Time Pore Pressure Monitoring Of Ash And Construction-Induced Responses: The State Of The Practice, Paul C. Schmall, Chris Hardin, Kenneth Campbell, Ryan Smith
World of Coal Ash Proceedings
No abstract provided.
Field And Laboratory Methods To Demonstrate Monitored Natural Attenuation For Coal Combustion Product Constituents In Groundwater, Jim Redwine, Masa Kanematsu, Kristi Mitchell, Dimitri Vlassopoulos
Field And Laboratory Methods To Demonstrate Monitored Natural Attenuation For Coal Combustion Product Constituents In Groundwater, Jim Redwine, Masa Kanematsu, Kristi Mitchell, Dimitri Vlassopoulos
World of Coal Ash Proceedings
No abstract provided.
Addressing Public Fear With Facts—Tva Coal Ash Fact Sheets, Melissa Hedgecoth, Lisa Jn Bradley, Rock Vitale, Neil Carriker
Addressing Public Fear With Facts—Tva Coal Ash Fact Sheets, Melissa Hedgecoth, Lisa Jn Bradley, Rock Vitale, Neil Carriker
World of Coal Ash Proceedings
No abstract provided.
Developing Single Use Deposits Of Coal Derived Fly Ash As A National Resource, Nigel Cooke
Developing Single Use Deposits Of Coal Derived Fly Ash As A National Resource, Nigel Cooke
World of Coal Ash Proceedings
No abstract provided.
Six Years Of Service, Supply, And Success: Processing Harvested Ccr From Impoundments, William Fedorka, P.E.
Six Years Of Service, Supply, And Success: Processing Harvested Ccr From Impoundments, William Fedorka, P.E.
World of Coal Ash Proceedings
No abstract provided.
Experimental Characterization And Manufacture Of Polymer Nanocomposite Dielectric Coatings For High-Temperature Superconductor Applications, Jacob Ryan Mahon
Experimental Characterization And Manufacture Of Polymer Nanocomposite Dielectric Coatings For High-Temperature Superconductor Applications, Jacob Ryan Mahon
Theses and Dissertations
Increased implementation of high-temperature superconducting (HTS) power transmission has the potential to revolutionize the efficiency of electrical grids and help unlock a fully electric transportation infrastructure. Realizing the benefits of HTS systems has been impeded by a lack of available dielectric insulation materials that can 1) withstand the extreme cryogenic operating environment of superconductors and 2) demonstrate low temperature processing that is compatible with existing superconductor manufacturing methods. Solving this problem necessitates a high-performance dielectric material with multifunctional properties specifically suited for operation in HTS systems. A polyamide and silicon dioxide (PA/SiO2) nanocomposite material with exceptional thermal stability has been …
Development Of New, Diverse Triggering Mechanisms Of Shape Memory Polymers For Cell Mechanobiology Studies, Mark Macios
Development Of New, Diverse Triggering Mechanisms Of Shape Memory Polymers For Cell Mechanobiology Studies, Mark Macios
Theses - ALL
Over the past decade, several shape-memory polymer (SMP) substrates capable of changing topography under cell-culture conditions have been developed for the study of cell mechanobiology. Most initial reports of cytocompatible SMP platforms employed thermal triggering under ambient heating conditions, which, especially in hydrated environments, is a slow process that generally takes several minutes to a few hours. Also, biocompatible SMPs initially featured recovery temperatures too high for cells to maintain viability during the thermal trigger. To overcome the limitations of ambient thermal heating triggered shape recovery, the goal of this thesis was to develop new cytocompatible SMPs that can trigger …
Manipulated Electrochemical Surface Reactions Induced By Oscillatory Electric Potentials On Metal Based Electrodes, Thomas Stone Welles
Manipulated Electrochemical Surface Reactions Induced By Oscillatory Electric Potentials On Metal Based Electrodes, Thomas Stone Welles
Dissertations - ALL
This research effort investigates the manipulation of surface electrochemical reactions induced by oscillating electric potentials on the surface of metal-based electrodes. Specifically, this research presents experimental data identifying modified electrochemical surface reactions caused by low magnitude electric potential oscillations on multilayered catalytic membranes and on implanted biometallic alloys. The scope of this effort consists of four major components: (1) perform an exhaustive literature review and analysis of the current understanding in applied surface electrochemistry and develop potential theoretical frameworks by which to interpret the experimental results; (2) identify the electrochemical manipulation via electrical oscillation while reacting nitric oxide on a …
Enhancing Optical And Thermal Properties Of Nanofibrous Films Inspired By The White Beetle Scale, Bokyung Park
Enhancing Optical And Thermal Properties Of Nanofibrous Films Inspired By The White Beetle Scale, Bokyung Park
Nanoscience and Microsystems ETDs
The Cyphochilus white beetle has received significant attention recently for its exceptional visible-light-scattering properties, owing to the beetle scale's anisotropic nano-fibrillar network structure. Inspiration from the remarkable optical properties of these biological species has directed research efforts to fabricating biomimetic nano-fibrillar structures with polymer materials. In this work, electrospun silk fibroin polymer films reproduce the white beetle scale's anisotropic nature to draw on its optical scattering properties and further improve the radiative-cooling capabilities of silk fabrics. An anisotropically restructured silk film with a mean fiber diameter of a few hundred nanometers substantially increases optical scattering strength in the visible spectrum …
A Modular Synthesis Of Processable And Thermally Stable Semi-Fluorinated Aryl Ether Polymers Via Step-Growth Polymerization Of Fluoroalkenes, Ketki Eknath Shelar
A Modular Synthesis Of Processable And Thermally Stable Semi-Fluorinated Aryl Ether Polymers Via Step-Growth Polymerization Of Fluoroalkenes, Ketki Eknath Shelar
Theses and Dissertations
Tailored fluoropolymers remain the leading choice for a wide variety of advanced high-performance applications, including electronic/optical and energy conversion, owing to their unique blend of complementary high-performance properties. Amorphous semi-fluorinated polymers exhibit improved solubility and melt processability when compared to traditional perfluoropolymers. A leading class of semi-fluorinated aryl ether polymers includes perfluorocyclobutyl (PFCB), perfluorocycloalkenyl (PFCA), and fluoroarylene vinylene ether (FAVE) polymers. Monomers containing aromatic trifluorovinyl ethers (TFVE) are used to synthesize PFCB polymers via radical-mediated [2+2] cyclodimerization. On the other hand, FAVE and PFCA polymers are polymerized via base-mediated nucleophilic addition/elimination of bisphenols with TFVE monomers and decafluorocyclohexene respectively. The …
Challenges And Signal Processing Of High Strain Rate Mechanical Testing, Barae Lamdini
Challenges And Signal Processing Of High Strain Rate Mechanical Testing, Barae Lamdini
Theses and Dissertations
Dynamic testing provides valuable insight into the behavior of materials undergoing fast deformation. During Split-Hopkinson Pressure Bar testing, stress waves are measured using strain gauges as voltage variations that are usually very small. Therefore, an amplifier is required to amplify the data and analyze it. One of the few available amplifiers designed for this purpose is provided by Vishay Micro-Measurements which limits the user’s options when it comes to research or industry. Among the challenges of implementing the Hopkinson technology in the industry are the size and cost of the amplifier. In this work, we propose a novel design of …
Phase-Field Simulations Of The Precipitation Kinetics And Microstructure Development In Nickel-Based Superalloys, Caleb O. Yenusah
Phase-Field Simulations Of The Precipitation Kinetics And Microstructure Development In Nickel-Based Superalloys, Caleb O. Yenusah
Theses and Dissertations
The continual research and development of nickel-based superalloys is driven by the global demand to improve efficiency and reduce emissions in the aerospace and power generation industries. Integrated Computational Material Engineering (ICME) is a valuable tool for reducing the cost, time, and resources necessary for the development and optimization of the mechanical properties of materials. In this work, an ICME approach for understanding the microstructure development and optimizing the mechanical properties in nickel-based superalloys is employed. Most nickel-based superalloys are precipitate strengthened by either the γ’ phase, γ” phase, or both. Therefore, understanding the precipitation kinetics and morphological evolution of …
Finite-Difference-Time-Domain Simulation Of Ultrafast Experiments, Alpha Ma
Finite-Difference-Time-Domain Simulation Of Ultrafast Experiments, Alpha Ma
Macalester Journal of Physics and Astronomy
The Finite-Difference-Time-Domain (FDTD) method is a numerical method that calculates electric fields or magnetic fields by interleaving them in space and time. Using a python package called “MEEP”, I was able to write optical simulations of ultrafast experiments, especially the Terahertz Pump-Probe experiments. The goal of this project was to use FDTD simulation to measure the transmission of an electro-magnetic pulse passing through a thin film of conducting material on a dielectric substrate in order to study the characteristic conductivity of potential solar cell materials.
Copolymer Microphase Separation, Properties, And Applications, Daniel Weller
Copolymer Microphase Separation, Properties, And Applications, Daniel Weller
Dissertations
Copolymers represent a broad, but critically important class of materials. Often having properties superior to either of its constituents, copolymers are used in virtually all industries including automotive, aerospace, coatings, packaging, and cosmetics. Certain copolymers microphase separate to form nanosized domains that improve the physical properties of the copolymer. The polymer community already has a thorough understanding of how phase separation occurs, but the commercialization of phase separating copolymers lags significantly behind academia. Many of the copolymers that exist that have been undercharacterized and underutilized. This dissertation examines two such polymers. The first, a hard polystyrene material with soft nanodomains. …
Receptor-Doped Organic Transistors: Transducing Anion Binding From Mixed Ionic-Electronic Transport, Anthony Benasco
Receptor-Doped Organic Transistors: Transducing Anion Binding From Mixed Ionic-Electronic Transport, Anthony Benasco
Dissertations
Organic semiconductors based on π-conjugated polymers show remarkable properties such as high tolerance to structural defects, low processing temperature requirements, biocompatibility, ease of fabrication, and tunable properties. Conjugated polymers integrated into device arrays can exhibit collective properties sensitive to minor perturbations in the surrounding media. However, these devices rely on serendipitous sensitivity to the analyte of interest, and strategies for specific detection remain a considerable change. There remains a compelling, global need for technologies to monitor phosphate due to its prevalence in agricultural runoff, leading to fish kills and economic decline for commercial and recreational fisheries. The strong hydration energies …
Monolithically Integrated Microscale Pressure Sensor On An Optical Fiber Tip, Jeremiah C. Williams, Hengky Chandrahalim
Monolithically Integrated Microscale Pressure Sensor On An Optical Fiber Tip, Jeremiah C. Williams, Hengky Chandrahalim
AFIT Patents
A passive microscopic Fabry-Pérot Interferometer (FPI) pressure sensor includes an optical fiber and a three-dimensional microscopic optical enclosure. The three-dimensional microscopic optical enclosure includes tubular side walls having lateral pleated corrugations and attached to a cleaved tip of the optical fiber to receive a light signal. An optically reflecting end wall is distally engaged to the tubular side walls to enclose a trapped quantity of gas that longitudinally positions the optically reflecting end wall in relation to ambient air pressure, changing a distance traveled by a light signal reflected back through the optical fiber.
Biodegradable Active Bio-Nanocomposite Film For The Enhanced Shelf Life Of Tomatoes, Kalpani Y. Perera, Shubham Sharma, Brendan Duffy, Amit K. Jaiswal, Swarna Jaiswal
Biodegradable Active Bio-Nanocomposite Film For The Enhanced Shelf Life Of Tomatoes, Kalpani Y. Perera, Shubham Sharma, Brendan Duffy, Amit K. Jaiswal, Swarna Jaiswal
Articles
The increased environmental pollution has led to finding sustainable solutions for non-renewable plastic-based food packaging materials. Thus, the use of biomaterial-based packaging material has become an immense trend. This work aims at developing an antimicrobial biodegradable chitosan-alginate bio-nano composite film with TiO2 nanoparticle (NPs) for food packaging applications. The film was developed by a solution casting method. The chemical, mechanical, thermal, barrier, antimicrobial, and biodegradable properties of the packaging films were evaluated. Packaging studies were performed for 15 days for cherry tomatoes. The designed packaging material had enhanced the mechanical properties with a significantly (p < 0.05) higher tensile strength of 15.76 folds and 2 fold higher elongation at break. The UV barrier properties increased by 88.6%, while the film transparency decreased by 87.23%. Molecular interaction of N-H covalent bonds was observed between alginate and chitosan together with TiO2 NPs. The developed bio-nano composite film showed antimicrobial activity against foodborne pathogens E. coli, S. aureus, S. typhi, and L. monocytogene with a log reduction of 7.08, 7.28, 6.04 & 6.02 log CFU/ml respectively at 24 hours incubation period. The film was completely biodegraded and a weight loss of 89.06% was observed in bio-nanocomposite film during the 3 months. Shelf-life estimation of cherry tomato using developed packaging films showed an increase in the shelf-life up to 8 days with stable pH, total soluble solids, and weight with no bacterial growth when packaged with prepared film. Owing to their improved mechanical, UV barrier, antibacterial, and biodegradability, the prepared active bio-nano composite packaging films could be considered a potential candidate for fruit packaging.
Analysis Of Hemp Fiber Reinforced Polylactide Composite Under High Strain-Rate, Benjamin Rhoads
Analysis Of Hemp Fiber Reinforced Polylactide Composite Under High Strain-Rate, Benjamin Rhoads
Honors Theses
The introduction of hemp fibers into a polylactide (PLA) matrix creates a hemp fiber-reinforced composite with 10% hemp fibers and 90% PLA. Natural fibers are becoming a popular alternative to synthetic fibers since they are environmentally friendly, and hemp-fibers are becoming used more often as the demand for natural fibers increased. A Split-Hopkinson Pressure Bar was used to test this composite against a control group using elastic wave propagation theory. Strain gauges were mounted on the incident and transmission bars of the SHPB to measure the propagation of the wave that caused the strain in the sample, which were used …
Relating Detonation Parameters To The Detonation Synthesis Of Silicon Carbide, Martin Langenderfer, Eric W. Bohannan, Jeremy Lee Watts, William Fahrenholtz, Catherine E. Johnson
Relating Detonation Parameters To The Detonation Synthesis Of Silicon Carbide, Martin Langenderfer, Eric W. Bohannan, Jeremy Lee Watts, William Fahrenholtz, Catherine E. Johnson
Chemistry Faculty Research & Creative Works
Detonation synthesis of silicon carbide (SiC) nanoparticles from carbon liberated by negatively oxygen balanced explosives was evaluated in a 23 factorial design to determine the effects of three categorical experimental factors: (1) cyclotrimethylene-trinitramine (RDX)/2,4,6-trinitrotoluene (TNT) ratio, (2) silicon (Si) additive concentration, and (3) Si particle size. These factors were evaluated at low and high levels as they relate to the detonation performance of the explosive and the solid Si-containing phases produced. Detonation velocity and Chapman-Jouguet (C-J) detonation pressure, which were measured using rate stick plate dent tests, were evaluated. Solid detonation product mass, silicon carbide product concentration, and residual silicon …