Optical Characterization Of Magnetism In Magnetic/Nonmagnetic Heterostructures, 2013 College of William & Mary - Arts & Sciences
Optical Characterization Of Magnetism In Magnetic/Nonmagnetic Heterostructures, Yichun Fan
Dissertations, Theses, and Masters Projects
This thesis focuses on the study of the static and dynamic magnetic interactions in ferromagnetic/nonmagnetic heterostructures using interface-specific and time-resolved optical techniques. The goal of this thesis is to elucidate the interface exchange coupling, magnetic anisotropy, and coherent spin dynamics in these advanced material systems, crucial to the realization of high performance spintronic devices.;First, a pronounced exchange bias (EB) phenomenon is observed in Fe/MgO (001) by magnetic second harmonic generation. The bulk magnetization does not, in marked contrast to typical systems where EB is manifested only in the net magnetization. The magnitude of the exchange bias varies with interface oxygen …
High-Performance Nanocomposites Designed For Radiation Shielding In Space And An Application Of Gis For Analyzing Nanopowder Dispersion In Polymer Matrixes, 2013 College of William & Mary - Arts & Sciences
High-Performance Nanocomposites Designed For Radiation Shielding In Space And An Application Of Gis For Analyzing Nanopowder Dispersion In Polymer Matrixes, Joseph Simcha Auslander
Dissertations, Theses, and Masters Projects
No abstract provided.
Final Report: Multipath Modeling And Mitigation Using Multiple Antennas (M4a), 2013 Brigham Young University
Final Report: Multipath Modeling And Mitigation Using Multiple Antennas (M4a), Michael Rice
Faculty Publications
This report documents the effort under contract W900KK-09-C-0016. The contract comprised four phases spanning 15 April 2009 to 1 December 2012. The relationship between the effort associated with each phase and the contents of this report are as follows: Phase 1 was devoted exclusively to the channel sounding experiments with the UH-1H helicopter. The experimental setup, procedure, and results for the channel sounding experiments at Cairns Army Airfield and Patuxent River are described in Chapter 2. Good, usable data at upper L-band was captured during the Cairns Army Airfield experiments. Phase 2 was devoted to the channel sounding experiments with …
Induction Of Cell Death Mechanisms And Apoptosis By Nanosecond Pulsed Electric Fields (Nspefs), 2013 Old Dominion University
Induction Of Cell Death Mechanisms And Apoptosis By Nanosecond Pulsed Electric Fields (Nspefs), Stephen J. Beebe, Nova M. Sain, Wei Ren
Bioelectrics Publications
Pulse power technology using nanosecond pulsed electric fields (nsPEFs) offers a new stimulus to modulate cell functions or induce cell death for cancer cell ablation. New data and a literature review demonstrate fundamental and basic cellular mechanisms when nsPEFs interact with cellular targets. NsPEFs supra-electroporate cells creating large numbers of nanopores in all cell membranes. While nsPEFs have multiple cellular targets, these studies show that nsPEF-induced dissipation of DeltaPsim closely parallels deterioration in cell viability. Increases in intracellular Ca2+ alone were not sufficient for cell death; however, cell death depended of the presence of Ca2+. When both events occur, cell …
Graphene-Supported Metal Nanoparticles For Applications In Heterogeneous Catalysis, 2013 Virginia Commonwealth University
Graphene-Supported Metal Nanoparticles For Applications In Heterogeneous Catalysis, Hany Elazab
Theses and Dissertations
Due to its unique properties and high surface area, Graphene has become a good candidate as an effective solid support for metal catalysts. The Nobel Prize in Physics for 2010 was awarded to Andre Geim and Konstantin Novoselov "for groundbreaking experiments regarding the two-dimensional material graphene". Microwave-assisted synthesis of various metallic nanostructured materials was investigated for CO oxidation applications. These metallic nanostructured materials were used to convert CO to CO2 as an effective approach for carbon monoxide elimination due to its harmful effect on health and environment. In particular, this dissertation is focusing on palladium as a transition metal that …
Model Based Fault Diagnosis And Prognosis Of Nonlinear Systems, 2013 Missouri University of Science and Technology
Model Based Fault Diagnosis And Prognosis Of Nonlinear Systems, Hasan Ferdowsi
Doctoral Dissertations
"Rapid technological advances have led to more and more complex industrial systems with significantly higher risk of failures. Therefore, in this dissertation, a model-based fault diagnosis and prognosis framework has been developed for fast and reliable detection of faults and prediction of failures in nonlinear systems. In the first paper, a unified model-based fault diagnosis scheme capable of detecting both additive system faults and multiplicative actuator faults, as well as approximating the fault dynamics, performing fault type determination and time-to-failure determination, is designed. Stability of the observer and online approximator is guaranteed via an adaptive update law. Since outliers can …
Optimized Techniques For Real-Time Microwave And Millimeter Wave Sar Imaging, 2013 Missouri University of Science and Technology
Optimized Techniques For Real-Time Microwave And Millimeter Wave Sar Imaging, Joseph T. Case
Doctoral Dissertations
"Microwave and millimeter wave synthetic aperture radar (SAR)-based imaging techniques, used for nondestructive evaluation (NDE), have shown tremendous usefulness for the inspection of a wide variety of complex composite materials and structures. Studies were performed for the optimization of uniform and nonuniform sampling (i.e., measurement positions) since existing formulations of SAR resolution and sampling criteria do not account for all of the physical characteristics of a measurement (e.g., 2D limited-size aperture, electric field decreasing with distance from the measuring antenna, etc.) and nonuniform sampling criteria supports sampling below the Nyquist rate. The results of these studies demonstrate optimum sampling given …
The Enterprise Aid Methodology: Concepts, 2013 Old Dominion University
The Enterprise Aid Methodology: Concepts, Thomas J. Meyers, Patrick T. Hester
Engineering Management & Systems Engineering Faculty Publications
The Enterprise AID − for assessment, improvement, and design − methodology is a systems science-, operational test and evaluation-, and multicriteria decision analysis-based approach to design and deployment of performance measurement systems (PMSs) tailored to specific enterprises pursuing any or all of enterprise assessment, improvement, or design. Its two phases of design and deployment sprang from designers’ inductively generated and now prototyped response to a gap they recognized between performance measurement capabilities required by contemporary enterprises and those offered by contemporary PMSs. This paper illustrates key concepts underlying AID, while a companion document, The Enterprise AID methodology: Application, draws from …
Thinking Systemically About Complex Systems, 2013 Old Dominion University
Thinking Systemically About Complex Systems, Patrick T. Hester, Kevin Macg. Adams
Engineering Management & Systems Engineering Faculty Publications
As machine age problems have given way to systems age messes, the underlying complexity associated with understanding these situations has increased exponentially. Accordingly, the methods we use to address these situations must evolve as well. Unfortunately, many antiquated methods for dealing with situations remain prominent. Systems engineering, traditionally, is the practical application of procedural problem solving, typically geared toward the acquisition of large-scale systems. The underlying paradigm for solving these problems can be characterized as systematic thinking. While quite appropriate for machine age problems, this approach lacks the theoretical rigor to deal with systems age messes. Thus, a new paradigm …
3-D Numerical Simulation Of Dam-Break Flows Over Movable Beds, 2013 University of Mississippi
3-D Numerical Simulation Of Dam-Break Flows Over Movable Beds, Reza Marsooli
Electronic Theses and Dissertations
Irvin Cooper was a prominent music educator in boys’ adolescent voice change research. Dr. Cooper developed the Cambiata concept as a method for teaching boys to sing throughout the voice change. This method was starkly different from the traditional model that encouraged the changing voice to be rested during the voice change. While working as the music supervisor for the Montreal protestant school system, Cooper developed his method of having boys sing during the voice change, which included arrangements and compositions specifically for changing voices. Cooper taught many prominent researchers of adolescent voice change, including Don Collins and John Cooksey. …
Geotechnical Technique To Strengthen Traditional I-Walls Through The Use Of Composite Material, 2013 University of Mississippi
Geotechnical Technique To Strengthen Traditional I-Walls Through The Use Of Composite Material, Jimmy Irby Jackson
Electronic Theses and Dissertations
On Monday, August 29, 2005, Hurricane Katrina struck the southern gulf coast of the United States. Hurricane Katrina produced record high amounts of surge water along the coastal regions, that over topped and eroded levees and flood walls, inevitably flooding the entire city of New Orleans. After Hurricane Katrina, the Department of Homeland Security approved a research grant to The University of Mississippi to develop effective but economic technique of strengthening existing I-walls. Using composite materials, a new retrofitting technique was developed to increase the stability of existing I-walls by implementing composite caps. For economical and practical testing, scale models …
Nanoenhanced Polyurea As A Blast Resistant Coating For Concrete Masonry Walls, 2013 University of Mississippi
Nanoenhanced Polyurea As A Blast Resistant Coating For Concrete Masonry Walls, Heather Kathryn Daniell Rivera
Electronic Theses and Dissertations
Blast impact is a major concern in the world today. The leading cause of death due to blast impacts is rapidly moving debris. To prevent this many researchers are looking for methods of improved blast resistance for concrete masonry walls. However, many available protective coatings are not flame retardant. This thesis focuses on nanoenhanced polyurea for applications in improving blast resistance, while possessing improved flame retardancy, of concrete masonry walls. The polyurea that is being researched is enhanced with nanoadditives in an effort improve both blast and fire resistance. These materials are dynamically tested and those showing marked improvement are …
Graphics Processing Unit Acceleration Of Computational Electromagnetic Methods, 2013 University of Mississippi
Graphics Processing Unit Acceleration Of Computational Electromagnetic Methods, Matthew Joseph Inman
Electronic Theses and Dissertations
The use of Graphical Processing Units (GPU's) for scientific applications has been evolving and expanding for the decade. GPU's provide an alternative to the CPU in the creation and execution of the numerical codes that are often relied upon in to perform simulations in computational electromagnetics. While originally designed purely to display graphics on the users monitor, GPU's today are essentially powerful floating point co-processors that can be programmed not only to render complex graphics, but also perform the complex mathematical calculations often encountered in scientific computing. Currently the GPU's being produced often contain hundreds of separate cores able to …
Infiltrated Composite Electrodes For Solid Oxide Fuel Cells, 2013 Missouri University of Science and Technology
Infiltrated Composite Electrodes For Solid Oxide Fuel Cells, Aligul Buyukaksoy
Doctoral Dissertations
"Solid oxide fuel cells (SOFCs) are electrochemical devices which can convert chemical energy to electrical energy with efficiencies up to 60%. In order for SOFCs to be favorable energy conversion devices, the power obtained from a unit volume should be improved. This corresponds to minimized resistances from SOFC components (composite electrodes and electrolyte). Stability of the generated power is another important issue. Degradation of SOFCs with time due to microstructural processes or chemical reactions that occur at operating conditions; and due to reduction/oxidation cycles caused by the changes in the anode has been an important obstacle that has prevented the …
Numerical Analyses Of Long Carbon Fiber Reinforced Concrete Panels Exposed To Dynamic Loading, 2013 Missouri University of Science and Technology
Numerical Analyses Of Long Carbon Fiber Reinforced Concrete Panels Exposed To Dynamic Loading, Zahra Sadat Tabatabaei
Doctoral Dissertations
"The purpose of this research was to evaluate impact and blast performance of long carbon fiber reinforced concrete experimentally and numerically. Experimental tests were conducted on plain concrete (PC), reinforced concrete, and four different types of long carbon fiber reinforced concrete (LCFRC). The results from each test were then compared to one another. This comparison indicates that adding long carbon fibers to concrete both increases the post-cracking behavior of concrete and decreases the spalls in either an impact or blast test. Among all of the fibers tested, Fiber Type B3 outperformed the other fibers, absorbing more energy during impact. Numerical …
The Manufacturing And Ballistic Testing Of Tri-Axial Quasi Three Dimensional Woven Composites Layered In Polyurea, 2013 University of Mississippi
The Manufacturing And Ballistic Testing Of Tri-Axial Quasi Three Dimensional Woven Composites Layered In Polyurea, Brandon Saint
Electronic Theses and Dissertations
The protection of important infrastructure and vital resources of the United States is essential to the Nation's security. Attacks using the Nation's infrastructure as weapons of mass destruction could have a disturbing physical and psychological consequences. Work needs to be done to enhance the protection of the Nation's infrastructure to prevent, deter, or mitigate the effects of deliberate attacks by terrorist. Toxic inhalation hazard (TIH) chemicals such as chlorine gas and anhydrous ammonia are very dangerous hazardous materials. Rail transportation of TIH creates risk that exposes highly populated areas across the country to this threat. This study investigates the ballistic …
Sustainability Of Water And Wastewater Infrastructure: Using A Public-Private Partnership Model For Project Financial Assessment, 2013 University of Mississippi
Sustainability Of Water And Wastewater Infrastructure: Using A Public-Private Partnership Model For Project Financial Assessment, Rebecca Werner Trotter
Electronic Theses and Dissertations
To supplement current and future budget shortfalls for improvements to water and wastewater infrastructure, Public-Private Partnerships (PPPs or P3) are being advocated by the American Society of Civil Engineers (ASCE) and others as a practical mechanism to ensure financial sustainability. A PPP involves a partnership between a government entity and a concessionaire--consisting of one or more private companies acting as a single, private incorporation--who make an agreement on funding, building, and operating a usually government-provided service, such as drinking water and wastewater infrastructure. This is different from a traditional contract between a government entity and a contractor because the concessionaire …
Impulsivity Like Traits And Risky Driving Behaviors Among College Students, 2013 Old Dominion University
Impulsivity Like Traits And Risky Driving Behaviors Among College Students, Matthew R. Pearson, Elaine M. Murphy, Ashley N. Doane
Psychology Faculty Publications
The present study examined the predictive effects of five impulsivity-like traits (Premeditation, Perseverance, Sensation Seeking, Negative Urgency, and Positive Urgency) on driving outcomes (driving errors, driving lapses, driving violations, cell phone driving, traffic citations, and traffic collisions). With a convenience sample of 266 college student drivers, we found that each of the impulsivity-like traits was related to multiple risky driving outcomes. Positive Urgency (tendency to act impulsively when experiencing negative affect) was the most robust predictor of risky driving outcomes. Positive Urgency is a relatively newly conceptualized impulsivity-like trait that was not examined in the driving literature previously, suggesting a …
A Hands-On, Active Learning Approach To Increasing Manufacturing Knowledge In Engineering Students, 2013 Marquette University
A Hands-On, Active Learning Approach To Increasing Manufacturing Knowledge In Engineering Students, Jay R. Goldberg, David B. Rank
Biomedical Engineering Faculty Research and Publications
This paper describes a new learning module implemented as part of the senior capstone design course at Marquette University to teach engineering students about basic manufacturing processes, lean manufacturing principles, and design for manufacturability. The module includes several examples of active and student centered learning as part of an in-class assembly line simulation exercise. Students reflected on this experience, and suggested process improvements to save time, reduce cost and waste, and improve the assembly line process. They learned of the importance of manufacturing documentation, process design, and design for assembly. At the end of the module, students understood the importance …
Using Architecture Models To Design Adaptive Socio-Technical Systems, 2013 Old Dominion University
Using Architecture Models To Design Adaptive Socio-Technical Systems, Holly A. H. Handley
Engineering Management & Systems Engineering Faculty Publications
An architecture framework is used to capture the overall design and structure of a complex system. The Human Viewpoint was developed to augment existing architectural frameworks with additional information relevant to the human component in the system. The Human View models collect and organize social parameters in order to understand the way that humans interact with other elements of the system; the Human View models define the socio-technological boundaries of the system. Analyses performed with the architectural data provide information regarding the congruence, or fit of the human and the system. For example, different key thread analyses identify problematic paths …