Digital Commons Network^™

Multivariate List Decoding Of Evaluation Codes With A Gröbner Basis Perspective, Philip Busse

University of Kentucky Doctoral Dissertations

Please download dissertation to view abstract.

Phonon-Energy-Coupling-Enhancement Effect And Its Applications, Pang-Leen Ong

University of Kentucky Doctoral Dissertations

Silicon Oxide/Oxynitride (SiO₂/SiON) has been the mainstream material used for gate dielectric for MOS transistors for the past 30 years. The aggressive scaling of the feature size of MOS transistor has limited the ability of SiO₂/SiON to work effectively as the gate dielectric to modulate the conduction of current of MOS transistors due to excess leakage current dominated by direct quantum tunneling. Due to this constraint, alternative gate dielectric/high-k is being employed to reduce the leakage current in order to maintain the rate of scaling of MOS transistors. However, the cost involved in the implementation of …

Modular Fast Direct Analysis Using Non-Radiating Local-Global Solution Modes, Xin Xu

University of Kentucky Doctoral Dissertations

This dissertation proposes a modular fast direct (MFD) analysis method for a class of problems involving a large fixed platform region and a smaller, variable design region. A modular solution algorithm is obtained by first decomposing the problem geometry into platform and design regions. The two regions are effectively detached from one another using basic equivalence concepts. Equivalence principles allow the total system model to be constructed in terms of independent interaction modules associated with the platform and design regions. These modules include interactions with the equivalent surface that bounds the design region. This dissertation discusses how to analyze (fill …

Novel Catalysts For The Production Of Co- And Co2-Free Hydrogen And Carbon Nanotubes By Non-Oxidative Dehydrogenation Of Hydrocarbons, Wenqin Shen

University of Kentucky Doctoral Dissertations

Non-oxidative dehydrogenation of hydrocarbons is an attractive alternative route for the production of CO- and CO₂-free hydrogen. It will satisfy a major requirement for successful utilization of polymer electrolyte membrane (PEM) fuel cells (< 10 ppm CO) and sequestering carbon as a potentially valuable by-product, carbon nanotubes (CNTs). Due to the deposition of carbon on the surface of catalyst particles during the reaction, catalyst performance, life-time, and purification of the generated carbon product, are significant issues to solve in order to make the process practically feasible. The scope of this thesis includes: the development of novel Fe, Ni, and Fe-Ni catalysts supported on a Mg(Al)O support to achieve improved catalytic performance with easily-purified CNTs; evaluation of catalysts for ethane/methane dehydrogenation at moderate reaction temperatures; and study of activation and deactivation mechanisms by a variety of characterization techniques including TEM, HRTEM, XRD, Mössbauer spectroscopy, and x-ray absorption fine structure (XAFS) spectroscopy. The Mg(Al)O support was prepared by calcination of synthetic MgAl-hydrotalcite with a Mg to Al ratio of 5. The catalysts were prepared either by conventional incipient wetness method or by a novel nanoparticle impregnation method, where the monodisperse catalyst nanoparticles were prepared in advance by thermal decomposition of a metal-organic complex in an organic-phase solution and then dispersed onto the Mg(Al)O support. Dehydrogenation of undiluted methane was conducted in a fix-bed plug-flow reactor. Before reaction, the catalysts were activated by reduction in hydrogen. Fe-based catalysts exhibit a higher hydrogen yield at temperature above 600ºC compared with monometallic Ni catalyst. FeNi-9 nm/Mg(Al)O, Fe-10 nm/Mg(Al)O and Fe-5 nm/ Mg(Al)O nanoparticle catalysts show much improved performance and longer life-times compared with the corresponding FeNi IW/Mg(Al)O and Fe IW/Mg(Al)O catalysts prepared by incipient wetness. 10 nm is the optimum particle size for methane dehydrogenation. Addition of Ni to Fe forming a bimetallic FeNi alloy catalyst enhances the catalytic performance at the temperatures below 650ºC. Metallic Fe, Ni, FeNi alloy and Fe-Ni-C alloy, unstable iron carbide are all catalytically active components. Catalysts deactivation is due to the carbon encapsulation. The carbon products are in the form of stack-cone CNTs (SCNTs) and multi-walled CNTs (MWNTs), depending on the reaction temperature and catalyst composition. The growth of CNTs follows a tip growth mechanism and the purity of cleaned CNTs is more than 99.5%.

Aluminum-Containing Layered Double Hydroxides: The Thermal, Mechanical, And Fire Properties Of (Nano)Composites Of Poly(Methyl Methacrylate), Charles Manzi-Nshuti, Dongyan Wang, Jeanne Hossenlopp, Charles A. Wilkie

Chemistry Faculty Research and Publications

Hydrotalcite-like anionic clays or layered double hydroxides (LDHs) of the general formula, [M^II_1-xM^III_x(OH)₂]_intra[(CH₂=CH(CH₂)₈COO^-)_x•nH₂O]_inter, with M^III = Al and M^II = Co, Ni, Cu, and Zn, have been prepared by the co-precipitation method and used to prepare nanocomposites with poly(methyl methacrylate) (PMMA). One goal of this work was to compare the morphology, thermal, fire and mechanical properties with those of the well known PMMA–montmorillonite system. The thermal properties of these systems are greatly …

Adding Simple Simulations To Video Games To Improve Realism, Leonard Kinnaird-Heether

Master's Theses and Doctoral Dissertations

In this paper a method of enhancing the realism of certain computer game types, particularly First Person Shooter games, is explored by attempting to include intelligent neutral background characters to the game environment. This method also requires that the inclusion of these background characters will not adversely affect the performance of a game by drastically increasing the computational complexity of the game. A simulation was created to show how this can be done using a group of intelligent agents based in a simulated world, and a simplified system of norms designed to influence the agents’ behavior. The agents are designed …

Metaphoric Perspective Theory: Language To Action For The Self, Individuals, Communities, And Culture, Steven Adam Stuglin

Master's Theses and Doctoral Dissertations

Metaphoric and tropic language have been a hallmark of human communication throughout the ages. From ancient examples and first attempts at scholarly understanding to postmodern lexicons of metaphor theory in two-dozen disciplines, the understanding of this lingual phenomenon has evolved and grown over arguably the entire length of human history. Communication scholars note the presence and prevalence of tropic language in practice and assert the power that it may have on how humans conceptualize the world around them.

Presented here is complete theory based in these long lines of lingual thought that asserts a direct and powerful relationship between language …

Rice Straw Fiber Polymer Composites: Thermal And Mechanical Performance, Fei Yao

LSU Doctoral Dissertations

Rice straw fiber can be considered as important potential reinforcing filler for thermoplastic composite because of its lignocellulosic characteristics. It is thus of practical significance to understand and predict the thermal decomposition process of rice straw fibers. A method proposed by Málek, Šesták, and co-workers was used to investigate and model thermal decomposition process of common natural fibers with detailed analysis on rice straw system. Assuming a global model occurring within the entire degradation of natural fibers with consideration of fiber as one pseudo-component, model can be used to describe both isothermal and non-isothermal degradation process of most selected fibers …

Matrix-Assisted Laser Desorption/Ionization Mass Spectrometry For The Analysis Of Collected Bioaerosols, Alton John Dugas

LSU Doctoral Dissertations

The goal of this dissertation was to demonstrate collection, detection and identification of microorganisms from bioaerosols using offline matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) for the analysis of proteins. MALDI-MS intact bacteria techniques were adapted for use with an orthogonal MALDI quadrupole-time-of-flight mass spectrometer. Results indicate the instrument is capable of analyzing intact whole-cells. The first phase was to evaluate three bioaerosol samplers, an Andersen N6 single-stage impactor (AI), a cyclone impactor, and a vacuum filter system. The samplers collected test bioaerosols using a constructed bioaerosol exposure chamber (BEC). The BEC allowed all three samplers to operate in parallel. Each …

Numerical Simulations Of Flow And Mass Transport In Micro-Fluidic Components For Modular Bio-Analytic Chip Applications, Sudheer D. Rani

LSU Doctoral Dissertations

Microfluidics has received a great deal of attention in the past decade. The ability of modular microfluidic chips to miniaturize integrate chemical and biological systems (µTAS) can be greatly productive in terms of cost and efficiency. During the design of these modular devices, misalignment of materials, geometrical or both is one of the most common problems. These misalignments can have adverse effect in both pressure driven and electrokinetically driven flows. In the present work, Numerical Simulations have been performed to study the effect of material and geometrical mismatch on the flow behavior and species progression in microfluidic interconnects. In the …

An Investigation Into The Implementation Of The Louisiana Comprehensive Curriculum Reading/English Language Arts In Selected First Grade Classrooms, Mary "Kitty" Taylor Ainsworth

LSU Doctoral Dissertations

This case study investigates the implementation of the Louisiana Comprehensive Curriculum English Language Arts in selected first grade classes. The teaching of the specific language arts skills, listening, speaking, reading, and writing, as directed the the Comprehensive Curriculum is examined. Four first grade teachers from a large urban school district, from an original sixteen first grade teachers, are observed during the hour and a half literacy instruction block once a week over a period of four weeks. These same four teachers are interviewed one-on-one by the researcher during the two interview sessions. Three themes developed throughout the observation from all …

Cluster Kinetics Modeling Of Glassforming Materials, Lisa Ann Brenskelle

LSU Doctoral Dissertations

In this work, a new model relating temperature and pressure to dielectric relaxation or viscosity of a glassformer is developed. The model is based upon cluster kinetics, reaction-like mechanisms describing interactions between glassformer monomers and their clusters. Mathematical solutions of population balance equations for monomer and cluster lead to molar concentrations in terms of rate coefficients of the reaction-like mechanisms. These are then related to viscosity or dielectric relaxation time through free volume theory. The resulting equations are tested against data for a variety of pure glassformers, fragile, non-fragile, large, and small molecules over a wide range of temperatures, pressures, …

Fast Marching Methods - Parallel Implementation And Analysis, Maria Cristina Tugurlan

LSU Doctoral Dissertations

Fast Marching represents a very efficient technique for solving front propagation problems, which can be formulated as partial differential equations with Dirichlet boundary conditions, called Eikonal equation: $F(x)|\nabla T(x)|=1$, for $x \in \Omega$ and $T(x)=0$ for $x \in \Gamma$, where $\Omega$ is a domain in $\mathbb{R}^n$, $\Gamma$ is the initial position of a curve evolving with normal velocity F>0. Fast Marching Methods are a necessary step in Level Set Methods, which are widely used today in scientific computing. The classical Fast Marching Methods, based on finite differences, are typically sequential. Parallelizing Fast Marching Methods is a step forward for …

Classifying Mental Tasks Based On Features Of Higher-Order Statistics From Eeg Signals In Brain–Computer Interface, Shang Ming Zhou, John Q. Gan, Francisco Sepulveda

School of Nursing and Midwifery

No abstract provided.

Dublin Core Metadata Harvested Through Oai-Pmh, Amy S. Jackson, Myung-Ja Han, Kurt Groetsch, Megan Mustafoff, Timothy W. Cole

University Libraries & Learning Sciences Faculty and Staff Publications

The introduction in 2001 of the Open Archives Initiative Protocol for Metadata Harvesting (OAI-PMH) increased interest in and awareness of metadata quality issues relevant to digital library interoperability and the use of harvested metadata to build "union catalogs" of digital information resources. Practitioners have offered wide-ranging advice to metadata authors and have suggested metrics useful for measuring the quality of shareable metadata. Is there evidence of changes in metadata practice in response to such advice and/or as a result of an increased awareness of the importance of metadata interoperability? This paper looks at metadata records created over a six-year period …

Inflammation: The Key To Health And Disease, Prakash Nagarkatti Ph. D, Donald J. Dipette M. D.

Journal of the South Carolina Academy of Science

No abstract provided.

Solution Chemical Synthesis Of Nanostructured Thermoelectric Materials, Xiaohua Ji, Terry M. Tritt, Xinbing Zhao, Joe W. Kolis

Journal of the South Carolina Academy of Science

No abstract provided.

Phonon Scattering Effects On Thermal Conductivity Of Tinisn-Based Half-Heusler Alloys, S. Bhattacharya, T. M. Tritt, M. J. Skove, M. Russell, S. J. Poon, V. Ponnambalam, Y. Xia, N. Thadhani

Journal of the South Carolina Academy of Science

No abstract provided.

Governing Certain Things: The Regulation Of Street Trees In Four North American Cities, Irus Braverman

Journal Articles

Most sociolegal studies of the urban street focus on the human element. By focusing on the tree, my Article offers a unique perspective on the interrelations between various actors within the public spaces of modern North American cities. Situated at the intersection of legal geography, anthropology, and Science and Technology Studies, this Article demonstrates how natural artifacts function as technologies of governance, thereby masking crucial political interventions behind a natural facade. The tensions between nature and the city, as embedded in both the construction and the regulation of street trees, provide an unusual perspective on the management of urban populations …

Religion At A Public University, Gerard V. Bradley

Journal Articles

On March 6, 2007, the College of William & Mary announced a “compromise” solution to its polite civil war over the historic Wren Chapel. In a joint statement with President Gene Nichol, the Board of Visitors declared that permanent display of the Christian cross within the Chapel would resume. The cross would be moved, however, from its former place at center stage on the Chapel altar. Accompanying the elocated display would be a plaque “explaining the College's Anglican roots.” The compromise further provided that, when needed during certain worship services, the cross could be moved back to the altar. When …

The Memory Gap In Surveillance Law, Patricia L. Bellia

Journal Articles

U.S. information privacy laws contain a memory gap: they regulate the collection and disclosure of certain kinds of information, but they say little about its retention. This memory gap has ever-increasing significance for the structure of government surveillance law. Under current doctrine, the Fourth Amendment generally requires government agents to meet high standards before directly and prospectively gathering a target's communications. The law takes a dramatically different approach to indirect, surveillance-like activities, such as the compelled production of communications from a third party, even when those activities yield the same information as, or more information than, direct surveillance activities. Because …

Real-Time Implementation Of A Statcom On A Wind Farm Equipped With Doubly Fed Induction Generators, Wei Qiao, Ganesh K. Venayagamoorthy, Ronald G. Harley

Electrical and Computer Engineering Faculty Research & Creative Works

Voltage stability is a key issue to achieve the uninterrupted operation of wind farms equipped with doubly fed induction generators (DFIGs) during grid faults. This paper investigates the application of a static synchronous compensator (STATCOM) to assist with the uninterrupted operation of a wind turbine driving a DFIG, which is connected to a power network, during grid faults. The control schemes of the DFIG rotor- and grid-side converters and the STATCOM are suitably designed and coordinated. The system is implemented in real-time on a real time digital simulator. Results show that the STATCOM improves the transient voltage stability and therefore …

Notes On The Multiple Facets Of Immigration Federalism, Rick Su

Journal Articles

This symposium essay takes as its starting point the contestable position that some degree of immigration federalism is both constitutionally permissible and politically desirable. It suggests, however, that liberating the issue of immigration from the shadows of federal exclusivity does not necessarily tell us much about what a conceptual framework or legal jurisprudence of immigration federalism should or will actually be like. This is not solely a function of the difficulties inherent in incorporating principles of federalism into what is usually understood to be an exclusive federal field of immigration. Rather, it is also a consequence of the rifts and …

Section 524(G) Without Compromise: Voting Rights And The Asbestos Bankruptcy Paradox, S. Todd Brown

Journal Articles

Section 524(g) of the Bankruptcy Code was adopted to protect unknown future asbestos personal injury victims' rights and prospects for financial recovery. To serve these goals and satisfy the demands of due process, Section 524(g) provides two basic forms of virtual representation for future victims - requiring the appointment of an independent legal representative and aligning the interests of future victims with current claimants (75% of whom must approve any plan that invokes Section 524(g)). In recent years, however, the 75% super-majority vote requirement has been transformed into a veto power wielded by a small group of law firms, who …

Law And Economic Change During The Short Twentieth Century, John Henry Schlegel

Contributions to Books

Published as Chapter 16 in Cambridge History of Law in America, Volume 3: The Twentieth Century and After (1920–), Michael Grossberg & Christopher Tomlins, eds.

The brief recounting of the American economy in the twenties and thirties raises obvious questions about law and economic change. Economic change is the shift from one enacted, in both senses, understanding of economic life to another, in the case of the short twentieth century, from an associationalist economy to an impatient economy. This chapter explicates this economic change, and interrogates it in order to understand the role of law in its occurrence. Despite the …

The Supreme Court And The Politics Of Death, Stephen F. Smith

Journal Articles

This article explores the evolving role of the U.S. Supreme Court in the politics of death. By constitutionalizing the death penalty in the 1970s, the Supreme Court unintentionally set into motion political forces that have seriously undermined the Court's vision of a death penalty that is fairly administered and imposed only on the worst offenders. With the death penalty established as a highly salient political issue, politicians - legislators, prosecutors, and governors - have strong institutional incentives to make death sentences easier to achieve and carry out. The result of this vicious cycle is not only more executions, but less …

Estimation Of Earthquake Loss Due To Bridge Damage In The St. Louis Metropolitan Area: Part I - Direct Losses, Ronaldo Luna, David J. Hoffman, William T. Lawrence

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

The risk associated with earthquake hazards on highway systems is dependent on the complexity of a network and its redundancy in providing traffic flow. Earthquake loss estimation studies can provide decision makers with an appreciation of the importance of having a highway network resistant to earthquakes and information to make the network resistant to these events. The direct economic loss was estimated for a major metropolitan area, St. Louis, for a series of earthquake scenarios. The primary component of the study was damage to bridges within the highway system. The study zone covers the St. Louis metropolitan area and its …

Development Of Ballistic Limit Equations For Dual-Wall Spacecraft Shielding: A Concise History And Suggestions For Future Development, William P. Schonberg

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

All earth-orbiting spacecraft are susceptible to impacts by orbital debris particles, which can occur at extremely high speeds and can damage flight- and mission-critical systems. The traditional damage mitigating shield design for this threat consists of a “bumper” that is placed at a relatively small distance away from the main “inner wall” of the spacecraft. The performance of a hypervelocity impact shield is typically characterized by its ballistic limit equation, which is typically drawn as a line of demarcation between regions of rear-wall perforation and no perforation; when graphically represented, it is often referred to as a ballistic limit curve. …

Opportunities For Network Development In Kazakhstan - Wimax, Zhanibek Dossybayev

Theses

The purpose of this paper is to discuss Worldwide Interoperability for Microwave Access (Wimax) technology-based network deployment opportunities in Kazakhstan. To be widely adapted and be profitable, even the very promising technology with advantageous features must experience market testing and meet user needs. This project consists of two parts; the first part consists of analysis while the second part focuses on implementation. In the first part, the telecommunications industry of Kazakhstan is divided into three main segments: fixed communication, mobile communication, and internet & data communication. Some market characteristics are viewed based on data from National Statistics Agency of Kazakhstan, …

Element Analysis Of The Green Building Process, Richard Zigenfus

Theses

This thesis studied the definition of a green building and the elements associated with the construction of single family home versus an office building. There are many rating systems available across the Country both private and public. The most well known is the LEED rating system developed by the United States Green Building Council. LEED has several rating programs now available. The eight elements of LEED for Homes are used as the basis of the research to create commonality throughout the documentation. Thirty single-family homes and office projects were examined and detailed in order to determine the aspects within each …