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2006

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Distribution Dynamics Of Complex Systems, Young-Pyo Jeon Jan 2006

Distribution Dynamics Of Complex Systems, Young-Pyo Jeon

LSU Doctoral Dissertations

A complex system is defined as a system with many interdependent parts having emergent self-organization; analyzing and designing such complex systems is a new challenge. A common observable structure of many complex systems is the network, which is connections among nodes, and thus inherently difficult to describe. The goal of this research is to introduce an effective methodology to describe complex systems, and thus we will construct a population balance (distribution kinetics) model based on the association-dissociation process to describe the evolution of complex systems. Networks are commonly observed structures in complex systems with interdependent parts that self-organize. How networks …

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The Effects Of Perceptions On Consumer Acceptance Of Genetically Modified (Gm) Foods, Jae-Hwan Han Jan 2006

The Effects Of Perceptions On Consumer Acceptance Of Genetically Modified (Gm) Foods, Jae-Hwan Han

LSU Doctoral Dissertations

This study investigates the effects of risk/benefit beliefs on consumer purchase intentions for genetically modified (GM) foods. A random, national, mail survey is conducted. Three main problems are addressed in the study. The first problem addressed is to analyze the relationship between consumers risk/ benefit beliefs regarding GM foods, and their willingness to buy GM crop and meat products. The second problem deals with linkages between a consumer’s risk/benefit beliefs about GM foods and willingness to pay (WTP) for GM foods with a benefit disclosure. The third problem addressed is to test a causal relationship between knowledge and trust toward …

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A Conductor's Study Of Ruth Watson Henderson's Voices Of Earth, Ryan Jeffrey Hebert Jan 2006

A Conductor's Study Of Ruth Watson Henderson's Voices Of Earth, Ryan Jeffrey Hebert

LSU Doctoral Dissertations

Ruth Watson Henderson (b. 1932) has become one of Canada’s most prolific composers. She began her music study at a very early age and her career as a performer prospered as she received many awards and honors throughout her life. Her accomplishments as a performer and composer are numerous. Her work as the accompanist for the Toronto Children’s Choir has led to many pieces for children’s voices, and her involvement in church music as an organist has resulted in many sacred compositions for mixed choir. This research presents a brief biographical introduction of Ruth Watson Henderson and a conductor’s analysis …

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Development Of Analytical Techniques For The Analysis Of Submicron Particles And Protein Aggregates, Yohannes H. Rezenom Jan 2006

Development Of Analytical Techniques For The Analysis Of Submicron Particles And Protein Aggregates, Yohannes H. Rezenom

LSU Doctoral Dissertations

The goal of the research presented in this dissertation is to develop analytical techniques for the analysis of heterogeneous mixtures of submicron particles and protein aggregates. In Chapter 2, a simple and reproducible technique for constructing perfectly aligned gaps in fused-silica capillaries has been developed for postcolumn reagent addition with capillary electrophoresis (CE) to take advantage of laser-induced fluorescence (LIF) detection. This technique uses laser ablation with a Nd:YAG laser to create gaps of 14.0 ¡Ó 2.2 ƒÝm. These structures have been used for reagent addition for postcolumn derivatization with LIF detection and have been tested for the separation of …

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Uv-Liga Micro-Fabrication Of Inertia Type Electrostatic Transducers And Their Application, Seok Jae Jeong Jan 2006

Uv-Liga Micro-Fabrication Of Inertia Type Electrostatic Transducers And Their Application, Seok Jae Jeong

LSU Doctoral Dissertations

This dissertation discusses the design, working principles, static & dynamic analysis and simulation, mechanics of material, applied MEMS technology, micro-fabrication, and experimental testing of two types of micro-transducers: micro-power relay and micro-accelerometer. Several possible design concepts were proposed, and the advantages and disadvantages of electrostatic working principles were also discussed. Transducers presented in this research used electrostatic force as a driving force in the micro-relay and capacitance as a sensing parameter in the micro-accelerometer. There was an analogy between the micro-relay and the micro-accelerometer in their theoretical approach and fabrication processes. The proposed micro-transducers (micro-relay and micro-accelerometer) were fabricated using …

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Exploring The Hot-Carrier Effect On The Wireless Transceivers, Sameer R. Herlekar Jan 2006

Exploring The Hot-Carrier Effect On The Wireless Transceivers, Sameer R. Herlekar

LSU Doctoral Dissertations

Phase noise can be regarded as the most severe cause of performance degradation in the wireless communication systems. The hot-carriers (HCs), found in the CMOS synchronization circuits, are the high-energy charge carriers that degrade the MOSFET devices’ performance by increasing the threshold voltage required to operate the MOSFETs. The HC effect manifests itself as the phase noise whose level increases with the continued MOSFET operation and such increases result in the performance degradation of the voltage-controlled oscillator (VCO) built on the MOSFETs. The HC effect is particularly evident in the short-channel MOSFET devices. In this dissertation, we analyze the wireless …

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Performing Citizenship: Tensions In The Creation Of The Citizen Image On Stage And Screen, John William Wright Jan 2006

Performing Citizenship: Tensions In The Creation Of The Citizen Image On Stage And Screen, John William Wright

LSU Doctoral Dissertations

What does it mean to be a “citizen” of the United States? In the simplest of terms, citizenship is a limited position of identity, relegated to a narrow definition of legal and geographical position for an individual. But to be a “citizen” in America means far more than that – it becomes an accepted image of our collective identity which seeks an historical and political supremacy that allows America, and its citizens, to claim ideological status over anyone who is not a part of that nationalistic frame. The citizen has, for us, become a set of understood rights and privileges, …

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Theory Of Curvature-Dependent Disjoining Pressure And Its Application To Liquid Films, Jin Zhang Jan 2006

Theory Of Curvature-Dependent Disjoining Pressure And Its Application To Liquid Films, Jin Zhang

LSU Doctoral Dissertations

A liquid film of thickness h < 100 nm is subject to additional intermolecular forces, which are collectively called disjoining pressure Pi. Since Pi dominates at small film thicknesses, it determines the stability and wettability of thin films. Current theory for uniform films gives Pi = Pi(h). It becomes unbounded as h -> 0. We present a theory of curvature-dependent disjoining pressure. The new Pi depends on the curvature hxx, slope hx, and h. When this theory is implemented for Lennard-Jones liquid films, the new Pi is bounded as h -> 0. We show that this Pi captures three regimes of drop behavior (complete wetting, partial wetting, and pseudo partial wetting) without altering the signs of the long and short-range interactions. We also find that a drop with a uniform film is linearly stable, whereas a drop without a uniform film is unstable. Evaporating thin films is …

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An Inverse Homogenization Design Method For Stress Control In Composites, Michael Stuebner Jan 2006

An Inverse Homogenization Design Method For Stress Control In Composites, Michael Stuebner

LSU Doctoral Dissertations

This thesis addresses the problem of optimal design of microstructure in composite materials. The work involves new developments in homogenization theory and numerical analysis. A computational design method for grading the microstructure in composite materials for the control of local stress in the vicinity of stress concentrations is developed. The method is based upon new rigorous multiscale stress criteria connecting the macroscopic or homogenized stress to local stress fluctuations at the scale of the microstructure. These methods are applied to three different types of design problems. The first treats the problem of optimal distribution of fibers with circular cross section …

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Ultra-Violet Lithography Of Thick Photoresist For The Applications In Biomems And Micro Optics, Ren Yang Jan 2006

Ultra-Violet Lithography Of Thick Photoresist For The Applications In Biomems And Micro Optics, Ren Yang

LSU Doctoral Dissertations

UV lithography of thick photoresist is widely used in microelectromechanical systems (MEMS) and micro-optoelectromechanical systems (MOEMS). SU-8 is a typical negative tone thick photoresist for micro systems, and can be used for both structural material and pattern transfer. This dissertation presents an effort to comprehensively study these important subjects. The first part, and the most fundamental part of this dissertation concentrated on the numerical analysis and experimental study of the wavelength dependent absorbance of SU-8 and the diffraction effects on the sidewall profiles of the microstructures made using UV lithography of SU-8. This study has laid the foundation for all …

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Use Of Polyhydroxyalkanoates For Denitrification In Recirculating Aquaculture Systems, Maria Teresa Gutierrez-Wing Jan 2006

Use Of Polyhydroxyalkanoates For Denitrification In Recirculating Aquaculture Systems, Maria Teresa Gutierrez-Wing

LSU Doctoral Dissertations

Increasing demand of aquacultural products is driving the industry toward more intensive culture practices. Aquacultural operations are constrained by limitations on the availability high quality waters and regulatory pressures on the discharges. Recirculating systems can address these issues by reducing the amount of water required in the operation. Closed systems are especially suited where biosecurity is important. In closed systems, nitrate accumulates, limiting the time the water can be reused. In marine inland systems, water reuse reduces the cost of salt for make up water. To increase the water reuse time, some form of nitrate removal process must be incorporated …

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Optical Control Plane: Theory And Algorithms, Stefan Alexandru Pascu Jan 2006

Optical Control Plane: Theory And Algorithms, Stefan Alexandru Pascu

LSU Doctoral Dissertations

In this thesis we propose a novel way to achieve global network information dissemination in which some wavelengths are reserved exclusively for global control information exchange. We study the routing and wavelength assignment problem for the special communication pattern of non-blocking all-to-all broadcast in WDM optical networks. We provide efficient solutions to reduce the number of wavelengths needed for non-blocking all-to-all broadcast, in the absence of wavelength converters, for network information dissemination. We adopt an approach in which we consider all nodes to be tap-and-continue capable thus studying lighttrees rather than lightpaths. To the best of our knowledge, this thesis …

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Development Of A Mix Design Methodology For Asphalt Mixtures With Analytically Formulated Aggregate Structures, Khalid Salim Alshamsi Jan 2006

Development Of A Mix Design Methodology For Asphalt Mixtures With Analytically Formulated Aggregate Structures, Khalid Salim Alshamsi

LSU Doctoral Dissertations

This research documents an extensive study on the design and characterization of asphalt mixtures for use as road pavement material. Several aspects of asphalt mixtures were addressed using the state of the art laboratory test equipment and technical literature from different information sources. The research was divided into two phases. Phase one included the design and detailed analysis of compaction and performance characteristics of asphalt concrete mixtures with aggregate structures that were designed using an analytical method of aggregate blending. Three aggregate types were considered in this study: limestone, sandstone, and granite. All the aggregates were crushed aggregates. Three different …

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Residue Coevolution: Modeling And Interpretation, Zhengyuan Wang Jan 2006

Residue Coevolution: Modeling And Interpretation, Zhengyuan Wang

LSU Doctoral Dissertations

Coevolution between amino acid residues and its context-dependence are important for exploring protein structure and function, and critical for understanding protein structural and functional evolution. Coevolution has long been ignored because of its complexity and the lack of computing power. In the research presented here, I developed an efficient coevolution analysis methodology based on likelihood comparisons of statistical models. Likelihood ratios and Bayes factors, calculated using the Markov chain Monte Carlo algorithm, were employed as the statistics. Two types of models, 2-state and 3-state, were developed to allow for the context-dependence of coevolution. Computer programs implementing this methodology were coded …

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Electrodeposition Of Cocu Nanostructures, Yutong Li Jan 2006

Electrodeposition Of Cocu Nanostructures, Yutong Li

LSU Doctoral Dissertations

Electrodeposition is a key component in the microelectronic industry because it has the following advantages: low cost, easy operation and the capability to deposit into irregular geometries such as recessed and curved areas. In this dissertation, CoCu alloys were investigated to fabricate multilayers, microdevices and microposts. All of these multilayer structures were composed of nanometric copper and cobalt-rich layers in order to obtain magnetoresistance, a phenomenon where the resistance of multilayer structures decreases with increases of external magnetic field. An investigation was carried out in order to evaluate appropriate plating conditions during multilayered thin film deposition, with the aim to …

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Structural Performance Of Approach Slab And Its Effect On Vehicle Induced Bridge Dynamic Response, Xiaomin Shi Jan 2006

Structural Performance Of Approach Slab And Its Effect On Vehicle Induced Bridge Dynamic Response, Xiaomin Shi

LSU Doctoral Dissertations

Differential settlement often occurs between the bridge abutment and the embankment soil. It causes the approach slab to lose its contacts and supports from the soil and the slab will bend in a concave manner. Meanwhile, loads on the slab will also redistribute to the slab ends, which may result in faulting (or "bump") at the slab ends. Once a bump forms, repeating traffic vehicles can deteriorate the expansion joint in turn. In this case, the vehicle receives an initial disturbance before it reaches the bridge. This excitation introduces an extra impact load on the bridge and affects its dynamic …

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Understanding An Indigenous Curriculum In Louisiana Through Listening To Houma Oral Histories, Nicholas Anthony Ng-A-Fook Jan 2006

Understanding An Indigenous Curriculum In Louisiana Through Listening To Houma Oral Histories, Nicholas Anthony Ng-A-Fook

LSU Doctoral Dissertations

Indigenous communities have inhabited Louisiana since time immemorial. However, the national project of teaching the rise of the West as a heroic story remains the curricular centerpiece in elementary and high school history classes in North America. As a curriculum theorist, and former science and history teacher, I am concerned with the ways in which my teachings of colonialism’s cultural, historical, and national narratives suppress and silence the stories of the colonized. Therefore, the purpose of this paper (based on a four-year qualitative study) is to share oral histories of the United Houma Nation in order to illustrate their daily …

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A Micromechanical Approach For Predicting The Complex Shear Modulus And Accumulated Shear Strain Of Asphalt Mixtures From Binder And Mastics, Cristian Druta Jan 2006

A Micromechanical Approach For Predicting The Complex Shear Modulus And Accumulated Shear Strain Of Asphalt Mixtures From Binder And Mastics, Cristian Druta

LSU Doctoral Dissertations

Asphalt mixtures are particulate composite materials consisting of uniformly distributed mineral aggregates, asphalt binder and air voids. Mixtures of asphalt binder and filler, also called mastics, are often assumed to behave as simple viscoelastic materials, where the binders are stiffened by the filler. Because the workability and performance of bituminous mixes are known to be affected by the filler-asphalt mixture (or mastic) properties, this study is intended for performing rheological tests on asphalt binder and mastics and use the results in order to estimate performance parameters of asphalt mixture. The present work uses the PG64-22 asphalt binder test data initially …

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Measuring The Degree Of Market Power In The Export Demand For Soybean Complex, Dwi Susanto Jan 2006

Measuring The Degree Of Market Power In The Export Demand For Soybean Complex, Dwi Susanto

LSU Doctoral Dissertations

Previous studies on market power hypothesis strictly assumed that the data used in the analysis were a stationary process. This assumption has been argued that not all time series exhibit a stationary process such that conventional asymptotic theory cannot be applied. This study adopts the “New Empirical Industrial Organization” (NEIO) approach developed by Bresnahan (1982) and Lau (1982) to measure the degree of market power in the export market for soybean complex. The non-stationary properties of the data were accommodated by formulating the model in an error correction framework (ECM) developed by Bårdsen (1989) and applied by Steen and Salvanes …

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A Plasticity-Damage Model For Plain Concrete, Umit Cicekli Jan 2006

A Plasticity-Damage Model For Plain Concrete, Umit Cicekli

LSU Doctoral Dissertations

A plastic-damage model for plain concrete is developed in this work. The model uses two different yield criteria: one for plasticity and one for damage. In order to account both for compression and tension loadings, the damage criterion is divided into two parts: one for compression and a second for tension. The superscripts (+) and (-) in this work are used to represent tension and compression cases, respectively. The total stress is decomposed into tension and compressions components. The total strain is decomposed into elastic and plastic parts. The strain equivalence concept is used such that the strains in the …

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Whose Input Counts And Which Paradigm Prevails?: A Content Analysis Of Mass-Mediated Debate On U.S.-China Relations In 1990'S And A Policy Critique On Republican Virtue Of The Policy Tradeoff, Xiaowei Chen Jan 2006

Whose Input Counts And Which Paradigm Prevails?: A Content Analysis Of Mass-Mediated Debate On U.S.-China Relations In 1990'S And A Policy Critique On Republican Virtue Of The Policy Tradeoff, Xiaowei Chen

LSU Doctoral Dissertations

This dissertation examines the public opinion-public policy nexus with regard to the making of U.S.-China policy during the Clinton administration (1992-2000). The researcher investigates how the mass media discourse on U.S.-China relations relates to the policy tradeoff between economic interdependence and confrontation on human rights. Particularly, the quantitative study of the media discourse is placed within a Communitarian perspective to determine: (1) whether the policy tradeoff can claim to have the support of public opinion; (2) whether the media discourse originated from the active civic participation; and (3) how the policy tradeoff broke its promise. As a result, the researcher …

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Factors Influencing The Participation In Environmental Stewardship Programs: A Case Study Of The Agricultural And Forestry Sectors In Louisiana, Carrie Castille Mendoza Jan 2006

Factors Influencing The Participation In Environmental Stewardship Programs: A Case Study Of The Agricultural And Forestry Sectors In Louisiana, Carrie Castille Mendoza

LSU Doctoral Dissertations

Considerable research has been conducted to evaluate the adoption of agricultural best management practices and their overall impact on improving environmental quality. However, limited studies have been conducted to evaluate the behavioral factors that influence the adoption of these practices in the context of educational programs The goal of this study is to determine the factors that influence farmer conservation behavior that might lead to an increased probability of improving agriculture and forestry watersheds. A conceptual model was developed to identify the: 1) identify landowner participation in watershed conservation projects, and 2) determine the factors influencing agriculture and forestry landowners …

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Vegetational Change And Land Degradation In The Lake Baringo Area, Kenya, During The Late Holocene: Evidence From The Paleorecord And Remote Sensing, Lawrence Morara Kiage Jan 2006

Vegetational Change And Land Degradation In The Lake Baringo Area, Kenya, During The Late Holocene: Evidence From The Paleorecord And Remote Sensing, Lawrence Morara Kiage

LSU Doctoral Dissertations

This dissertation investigates the history of vegetational changes and land degradation in the Lake Baringo area, Kenya, East Africa, during the Late Holocene. It uses 14C -and 210Pb-dated fossil pollen, fungal spores, microscopic charcoal, and stratigraphic record from lake-sediment cores to reconstruct the paleoenvironment in the East African region. More recent changes in the Lake Baringo are examined using remote sensing imagery. These data provide one the first high-resolution late Holocene pollen records from the semi-arid region of Kenya (and one of only a handful from East Africa in general). Lake Baringo records a sedimentation rate of 1 cm yr-1, …

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An Adaptive Multi-Scale Computational Method For Modeling Nonlinear Deformation In Nanoscale Materials, Wenming Wang Jan 2006

An Adaptive Multi-Scale Computational Method For Modeling Nonlinear Deformation In Nanoscale Materials, Wenming Wang

LSU Doctoral Dissertations

In this dissertation a coupled multi-scale computational model for simulating nonlinear deformation processes in crystalline metals at finite temperatures is developed. The computational model uses the finite element method to model the coarse scale response of the material. The constitutive response in the finite element will be modeled through interatomic potentials acting on the underlying homogeneous crystal lattice that characterizes its nanostructure. An adaptive remeshing technique is proposed to automatically delineate regions of severe deformation where homogeneity of the microstructure/deformation is violated. In these regions the finite element will be replaced by a set of deformed atoms which interact with …

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Design And Fabrication Of Micro Transducers Using Cured Su-8 Polymer As Main Structural Material, Wen Dai Jan 2006

Design And Fabrication Of Micro Transducers Using Cured Su-8 Polymer As Main Structural Material, Wen Dai

LSU Doctoral Dissertations

Polymer based micro-transducers have many advantages over the traditional silicon based micro-transducers, such as easy integration with metal structures, design flexibility, and low fabrication costs. The characteristics of micro-transducers include converting electrical signals to/from mechanical response, the ability to sustain loading, sensitivity to external excitation, and etc. Some of the difficulties in realizing these characteristics include: characterizing material mechanical properties, techniques for producing electrically conductive polymer structures, and reliable fabrication procedures. In this dissertation, research addressing these difficulties is presented. The developed techniques are demonstrated in the design and fabrication of a SU-8 polymer based comb-drive micro-actuator. The micro-actuator used …

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Investigation Of Protein-Dna Contacts In The Saccharomyces Cerevisiae Rna Polymerase Iii Recruitment Factor (Tfiiib) Complex And Effects Of Promoter Topology On Transcription, Nick Dimitrios Tsihlis Jan 2006

Investigation Of Protein-Dna Contacts In The Saccharomyces Cerevisiae Rna Polymerase Iii Recruitment Factor (Tfiiib) Complex And Effects Of Promoter Topology On Transcription, Nick Dimitrios Tsihlis

LSU Doctoral Dissertations

The TATA-binding protein (TBP) is required for transcription by all three nuclear RNA polymerase systems. TBP binds the TATA box (consensus sequence TATAa/tAa/tN) and induces an ~80° bend in the DNA. To achieve recruitment of Saccharomyces cerevisiae RNA polymerase III, TBP is associated with two additional factors, Brf1 and Bdp1, to form initiation factor TFIIIB. This study focuses on interactions between the proteins and DNA in TFIIIB, and effects of promoter topology on transcription. Previous data suggests that the structure or dynamics of the TBP-DNA complex may be altered upon entry of Brf1 and Bdp1 into the complex. Here, an …

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Fabrication, Characterization And Properties Of Hiercchically Ordered Nanocomposites, Avinash Dundigalla Jan 2006

Fabrication, Characterization And Properties Of Hiercchically Ordered Nanocomposites, Avinash Dundigalla

LSU Doctoral Dissertations

The objectives of this research are to study the structure, morphology and properties of poly(ethylene-oxide) (PEO)-clay nanocomposites using various imaging techniques. Optical Microscopy, Scanning Electron Microscopy, Environmental Scanning Electron Microscopy and Atomic Force Microscopy are used to image structures on all length scales. Complementary scattering experiments are discussed along with preliminary differential scanning calorimetry and Fourier Transform Infrared spectroscopy results. In particular we investigated the multilayered structures of PEO-Laponite and PEO-Montmorillonite multilayered films made from solution. The shear orientation of a polymer-clay network in solution combined with simultaneous solvent evaporation leads to supramolecular multilayer formation in the film. The resulting …

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The Role Of Technology In The Interactions Between Secondary School Library Media Specialists And Teachers, Shirley Benson Mcdonald Jan 2006

The Role Of Technology In The Interactions Between Secondary School Library Media Specialists And Teachers, Shirley Benson Mcdonald

LSU Doctoral Dissertations

Statewide studies of school library media centers in at least sixteen states (other than Louisiana) indicate that effective school library media center programs have a positive impact on student achievement. According to these studies, effective school library media centers have: (a) a qualified library media specialist, (b) adequate support staff, (c) current and large collections, (d) access to information technology that is integrated into the curriculum, and (e) time for collaboration with the faculty. This study was developed to explore the role of technology in the collaborations between school library media specialists and teachers. Data revealed that interactions between school …

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Summary Of Lecture Recital: Bright Sheng's Selected Chamber Music For Strings: Two Violin Solos, And Two String Quartets, Mei-Mei Wei Jan 2006

Summary Of Lecture Recital: Bright Sheng's Selected Chamber Music For Strings: Two Violin Solos, And Two String Quartets, Mei-Mei Wei

LSU Doctoral Dissertations

Bright Sheng was born in Shanghai, China, in 1955, and became one of America’s leading composers in the twentieth-century. Bright Sheng’s orchestral music, opera and chamber music is frequently performed throughout the world. His musical language combines Chinese folk music and Western techniques--the meeting of East and West. This essay will discuss Bright Sheng’s The Stream Flows for solo violin (1990), Three Fantasies for Violin and Piano (2006), String Quartet No.3 (1993), and String Quartet No.4 Silent Tempo (2000). These works represent Sheng’s chamber music for strings. This essay will be organized as follows: Chapter 1 will provide Bright Sheng’s …

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How Principal Participation In An Online Community Of Practice Impacts The Professional Development Experience Of Middle School Teachers, Cynthia Beatty Vavasseur Jan 2006

How Principal Participation In An Online Community Of Practice Impacts The Professional Development Experience Of Middle School Teachers, Cynthia Beatty Vavasseur

LSU Doctoral Dissertations

This study provided insights about incorporating an online community of practice into a professional development program designed to facilitate the instructional implementation of technology. Two middle schools in a southern state served as a comparative case study where this model of professional development was implemented. The primary goal of this research was to gain understanding of how principals interact with teachers and the roles principals assume during these interactions. A second goal was to determine how teachers perceived principal participation and how their levels of competence and efficacy were influenced by this experience. During four weeks of implementation principals participated …

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