Digital Commons Network^™

The Abolitionist Spectator: Resistant Readings Of Punishment, Rehabilitation, And Reform At The Louisiana State Penitentiary, Kathryn Marie Morris

LSU Doctoral Dissertations

For the majority of the twenty-first century, Louisiana has been the global leader in rates of incarceration. Despite its prevalence, many people encounter prisons and punishment only through representations in movies, television, and the news, remaining distant from the actual processes of punishment and prisons built in remote areas. The Louisiana State Penitentiary at Angola, however, is unique in the number of opportunities it presents for the public to enter the prison for large-scale events like the famous Angola Prison Rodeo, select drama club performances, or to visit the Angola Prison Museum. These opportunities are often read cynically, as moments …

Evaluating The Pesticide-Induced Outbreak Of Soybean Looper, Chrysodeixis Includens (Walker) (Lepidoptera: Noctuidae), In Louisiana Soybean, Scott Lee

LSU Doctoral Dissertations

Soybean looper, Chrysodeixis includens (Walker), has established itself as the primary lepidopteran defoliator in Midsouth soybean agroecosystems. Pesticide-induced outbreak events associated with this pest have been observed by soybean producers. The insecticides believed to prompt these incidents are routinely used for the control of other co-occuring pests, such as stink bugs. Outbreak conditions present soybean producers with conflicting management decisions for pests. Laboratory, greenhouse, and field experiments were conducted to provide a better understanding of insecticide usage impact on populations of C. includens and the arthropod community. To discern the potential mechanisms behind C. includens outbreak, a baseline for the …

Chinese Folk Song Meets Western Compositional Technique—A Case Study Of Zhou Long’S The Partita For The Violin And The Piano, Bo Wu

LSU Doctoral Dissertations

In the field of contemporary Chinese music, a large number of outstanding composers and works have emerged in China. As one of the most prominent Chinese American composers, Zhou Long has created many excellent pieces that combine Chinese national elements with world-class composition techniques. These contributions have helped promote Chinese music on the global stage. Zhou Long possesses profound creative skills, with a deep understanding of both Chinese national modes and Western composition techniques. By applying these skills and techniques to his works, he has developed a unique style that integrates Chinese national features with modern music concepts and techniques, …

Nanosecond Infrared Laser Ablation Dynamics, Achala Priyadarshani Deenamulla Kankanamalage

LSU Doctoral Dissertations

Laser ablation dynamics encompasses studies of fundamental physical processes of mid infrared laser ablation. Understanding the mechanisms of IR laser desorption and ionization can lead to improvements in laser ablation-based techniques and expansion of their applications. Control of material removal ensures both accuracy and precision of the laser ablation-based techniques. The laser ablation mechanism in the studied wavelength region, is a process of water vaporization and photothermal disruption of tissue. Glycerol was used as the ablation target to establish the methods. Experiments were first aimed at developing methods to monitor material removal during ablation using a 2.94 µm wavelength mid-IR …

Stabilizing Control Schemes For Grid-Connected Hybrid Pv-Energy Storage Systems, Indra Narayana Bhogaraju

LSU Doctoral Dissertations

A nonlinear stabilizing control scheme based on Lyapunov theory is proposed for a grid- connected hybrid photovoltaic (PV)/ battery/supercapacitor (SC) system. The system dynamics is developed in the stationary reference frame, and the state-space model of the system is derived and used to formulate the Lyapunov function (LF) candidate. The global asymptotic stability of the LF-based controller is discussed in detail. The real-time implementation feasibility of the proposed control scheme is validated through hardware-in-the-loop (HIL) studies of a grid- connected hybrid system under solar energy generation and grid load variations. To address the issue of digital computational time that leads …

The Global Transcription Factor Fur Is Activated By Binding A [2fe-2s] Cluster To Maintain Iron Homeostasis In Escherichia Coli, Chelsey Rene Fontenot

LSU Doctoral Dissertations

Iron is an essential element for biological functions. Organisms have developed specific mechanisms to acquire, store, and export iron to manage intracellular iron homeostasis. These mechanisms are crucial not only for providing the cells with adequate iron for biological processes but also for ensuring that cells are not overloaded with excess iron, which is highly toxic. The Ferric uptake regulator (Fur) is a global transcription factor for maintaining intracellular iron homeostasis in bacteria. Previously, it was postulated that when the intracellular iron content is elevated, Fur binds ferrous iron to down-regulate the iron acquisition genes and up- regulate the iron …

Performance Anxiety In Young Musicians: A Case Study Of Music Educators' Experiences, Carmen L. Rodriguez

LSU Doctoral Dissertations

Anxiety is a common emotional reaction in musicians that can negatively influence their performance. Some studies have proved that Music Performance Anxiety (MPA) can be found not only in adults but also in adolescents and children from 3 years old. Since MPA is a significant aspect of musicians’ development, it is essential that music educators take preventive action against MPA in young musicians, specifically under 18 years old. The purpose of this study is to examine the strategies used by music educators to address MPA in young musicians. Educators were interviewed regarding musical performance anxiety and its presence within their …

The Regulation Of Autoimmunity Genes In Pancreatic Β-Cells By Nf-Κb, Thomas Malone Martin

LSU Doctoral Dissertations

Type 1 diabetes (T1D) is an autoimmune disease where the immune system targets the pancreatic islet beta-cells, which are responsible for insulin production and secretion, leading to a state of insulin insufficiency. Many of the molecular details of disease onset and progression remain poorly understood, including key aspects of cytokine signaling. Therefore, we have examined some of the consequences of inflammatory cytokine signaling as a critical module relevant to T1D. Using interleukin-1 (IL-1) signaling as a well-defined paradigm for inflammation, we investigated key components of this signaling pathway in pancreatic beta-cells. We identified ICAM-1, one of the proteins expressed in …

Matroid Generalizations Of Some Graph Results, Cameron Crenshaw

LSU Doctoral Dissertations

The edges of a graph have natural cyclic orderings. We investigate the matroids for which a similar cyclic ordering of the circuits is possible. A full characterization of the non-binary matroids with this property is given. Evidence of the difficulty of this problem for binary matroids is presented, along with a partial result for binary orderable matroids.

For a graph G, the ratio of |E(G)| to the minimum degree of G has a natural lower bound. For a matroid M that is representable over a finite field, we generalize this to a lower bound on …

Attentional Focus Effects On Motor Variability, Charlend Kenneth Howard

LSU Doctoral Dissertations

Subtle changes in task instructions with associated changes of one’s focus of attention (FOA) can have measurable effects on performance and learning of complex motor skills (Wulf, 2013). The beneficial effects of adopting an external focus of attention (EF) have been well-documented in physical environments, and recently have also been demonstrated in virtual reality (VR) environments (Cochran, Aiken, Rhea, & Raisbeck, 2021; Yamada, Kuznetsov, Diekfuss, & Raisbeck, 2021). However, these studies primarily focused on performance outcomes (such as error and accuracy), with relatively less emphasis on movement coordination. Given that most human movements are motor abundant (more degrees of freedom …

First-Order Algorithms For Nonlinear Structured Optimization, Miao Zhang

LSU Doctoral Dissertations

Nonlinear optimization is a critical branch in applied mathematics and has attracted wide attention due to its popularity in practical applications. In this work, we present two methods which use first-order information to solve two typical classes of nonlinear structured optimization problems.

For a class of unconstrained nonconvex composite optimization problems where the objective is the sum of a smooth but possibly nonconvex function and a convex but possibly nonsmooth function, we propose a unified proximal gradient method with extrapolation, which provides unified treatment to convex and nonconvex problems. The method achieves the best-known convergence rate for first-order methods when …

Finite Element Methods For Elliptic Optimal Control Problems With General Tracking, Seonghee Jeong

LSU Doctoral Dissertations

This dissertation concerns a linear-quadratic elliptic distributed optimal control problem with pointwise state constraints in two spatial dimensions, where the cost function tracks the state at points, curves and regions of a domain.

First we explore the elliptic optimal control problem subject to pointwise control constraints. This problem is reduced into a problem that only involves the control. The solution of the reduced problem is characterized by a variational inequality. Then we introduce the elliptic optimal control problem with general tracking and pointwise state constraints. Here we reformulate the optimal control problem into a problem that only involves the state, …

Sl(2,Z) Representations And 2-Semiregular Modular Categories, Samuel Nathan Wilson

LSU Doctoral Dissertations

We address the open question of which representations of the modular group SL(2,Z) can be realized by a modular category. In order to investigate this problem, we introduce the concept of a symmetrizable representation of SL(2,Z) and show that this property is necessary for the representation to be realized. We then prove that all congruence representations of SL(2,Z) are symmetrizable. The proof involves constructing a symmetric basis, which greatly aids in further calculation. We apply this result to the reconstruction of modular category data from representations, as well as to the classification of semiregular categories, which are defined via an …

Switch-Like Behavior Of Lysosomes And Vcp Supports Spermatocyte Health And Development In Drosophila, Tyler James Butsch

LSU Doctoral Dissertations

Changes to societal norms, such as the educational, marital, and child-bearing expectations have coincided with significant increases in infertility worldwide. Surprisingly, male infertility is responsible for approximately half of all infertility cases worldwide. Thus, a better understanding of sperm development, and how it is affected by age, may permit the design and application of therapeutics to treat various cases male infertility. Here, I have found that lysosomes acidify as germ cells enter the spermatocyte stage. Once active, lysosomes turn over E-cadherin, and likely other proteins, to support plasma membrane stability. Notably, aging negatively impacts lysosome acidification, which can be reversed …

Contribution Of The Microbiome On Reproductive Outcomes During Pregnancy, Kalie Beckers

LSU Doctoral Dissertations

A series of translational comparative studies were performed to investigate the effects of the maternal microbiome on reproductive function and outcomes. With the launch of the human microbiome project in 2007, the next generation sequencing of microbiomes is booming. It is not only in the human medicine field, but also in veterinary species. This study specifically investigates the fecal microbiome in blood pressure high sublime 5 (BPH/5) mouse model that spontaneously develops preeclampsia (PE) and obesity. Additionally, the equine reproductive tract microbiome was explored and compared to microbiome of other host body sites. The BPH/5 mouse is a translational model …

Machine-Learning Approaches For Developing An Autograder For High School-Level Cs-For-All Initiatives, Sirazum Munira Tisha

LSU Doctoral Dissertations

Most existing autograders used for grading programming assignments are based on unit testing, which is tedious to implement for programs with graphical output and does not allow testing for other code aspects, such as programming style or structure. We present a novel autograding approach based on machine learning that can successfully check the quality of coding assignments from a high school-level CS-for-all computational thinking course. For evaluating our autograder, we graded 2,675 samples from five different assignments from the past three years, including open-ended problems from different units of the course curriculum. Our autograder uses features based on lexical analysis …

Improving Teacher Intervention Decisions Using The Fraction Error Flowchart, Katherine Pettrey

LSU Doctoral Dissertations

In the U.S. the fifth-grade mathematics curriculum is largely devoted to building fraction skills, providing an essential foundation for future success in mathematics (National Mathematics Advisory Panel, 2008). Unfortunately, students in the U.S. struggle with fraction proficiency (National Assessment of Educational Progress, 2022; Organisation for Economic Co-operation and Development, 2018). Even when teachers facilitate interventions for struggling students those interventions may not be aligned with student need (Riccomini, 2005). Additionally, teachers struggle to identify research-based practices (RBPs) when presented with student data (Means et al., 2009). The purpose of this study was to create and test a flowchart that could …

Did The Rapid Transition To Online Learning In Response To Covid-19 Protocols Results In Forced Disclosure By Faculty Members With Invisible Disabilities, Charles Edward Ethridge

LSU Doctoral Dissertations

In December of 2019, the SARS-CoV-2 virus, now commonly referred to as COVID-19, was first identified in Wuhan, China. The virus proved highly contagious and quickly spread around the globe. By April 7, 2020, Stay-at-Home orders and/or directives regarding the closures of non-essential businesses and schools had been issued throughout the US. While there has been considerable research since 2020 regarding the impact of COVID-19 on higher education, nearly all the research has focused on the effects on students, the economic impact on institutions, and the future landscape of higher education. However, there is little research regarding the effect on …

Analog Cosmology And Superfluidity In Atomic Gases And Electronic Materials, Anshuman Bhardwaj

LSU Doctoral Dissertations

We present a study of analog cosmological models in Bose-Einstein condensates (BEC) and in graphene, and superfluidity in a box-shaped traps. We start by examining the dynamics of a Bose-Einstein condensate (BEC) trapped inside an expanding toroid that can realize an analog inflationary universe. The expanding condensate forces phonons to undergo redshift and damping due to quantum pressure, owing to the thinness of the ring. We predict that such expanding BECs can exhibit spontaneous phonon creation from the vacuum state and show how it would manifest in the atom density and density correlations and discuss connections with the inflationary theory. …

Accurately Valuing Blue Carbon Sequestration And Storage To Foster Coastal Conservation Via Evidence-Based Policymaking And Model Environmental Services Statute Methodologies, John Shelton Penton Jr

LSU Doctoral Dissertations

Blue carbon ecosystems, especially mangrove forests, provide one of nature’s most effective means for sequestering carbon from the atmosphere and storing it in subsurface soils. The six nearshore coastal morphologies found in tropical and subtropical regions each possess a conspicuous environmental signature that can be employed to accurately estimate and predict mangrove forests’ carbon storage in above-ground biomass, below-ground biomass, and the soils by system type. The consistent geomorphology and geophysical processes within each of these coastal environmental settings, that is, the wave and tidal forcings, the rate of coastal sediment accretions, nutrient load and limitations (e.g., nitrogen-to-phosphorus …

An Examination Of Relationships Between Ear-Playing Skills And Intonation Skills Of High School And College-Aged Wind Instrumentalists, Ben Michael Herrick

LSU Doctoral Dissertations

Playing by ear and the ability to play in tune are components of musicianship that rely heavily on the ability to successfully discriminate musical pitches. Connections between ear-playing and intonation performance have rarely been addressed. The purpose of this study was to investigate relationships between intonation performance and ear-playing skills of high school and college-aged wind instrumentalists. Research questions were: (1) What is the relationship between the ability to play by ear and intonation performance? (2) How does intonation ability differ when the participants sightread notation compared to performing music that was learned by ear? (3) Do differences appear in …

Beyond Machine Learning: An Fmri Domain Adaptation Model For Multi-Study Integration, Lauryn Michelle Burleigh

LSU Doctoral Dissertations

Traditional machine learning analyses are challenging with functional magnetic
resonance imaging (fMRI) data, not only because of the amount of data that needs to be
collected, adding a particular challenge for human fMRI research, but also due to the change in
hypothesis being addressed with various analytical techniques. Domain adaptation is a type of
transfer learning, a step beyond machine learning which allows for multiple related, but not
identical, data to contribute to a model, can be beneficial to overcome the limitation of data
needed but may address different hypothesis questions than anticipated given the analysis
computation. This dissertation assesses …

The Effect Of High Fraction Of Inspired Oxygen On Human Motor Learning Processes, Zheng Wang

LSU Doctoral Dissertations

Human motor learning processes are fundamental for our daily activities and can be adversely affected by neurologic conditions. Motor learning largely depends on successfully integrating cognitive and motor-related sensory information. A simple, easily accessible treatment that could enhance these learning processes would be exciting and clinically impactful. In this dissertation, we explore the effect of normobaric 100% oxygen treatment (NbOxTr) during different motor learning tasks and investigate the brain oxygenation changes during the process. In the visuomotor adaptation task (VMA), when participants adapted to a visual distortion between visual feedback and hand movements, participants with NbOxTr exhibited better movement planning …

Physics-Based Crystal Plasticity Model For Predicting Microstructure Evolution And Dislocation Densities, Juyoung Jeong

LSU Doctoral Dissertations

This work presents three different studies investigating plastic deformation mechanisms in metals and alloys using crystal plasticity finite element (CPFE) modeling. The first study presents a new nonlocal crystal plasticity model for face-centered cubic single crystals under heterogeneous inelastic deformation. The model incorporates generalized constitutive relations that incorporate the thermally activated and drag mechanisms to cover different kinetics of viscoplastic flow in metals and describes the plastic flow and yielding of single-crystals using dislocation densities. The model is compared to micropillar compression experiments for copper single crystals and clarifies the complex microstructural evolution of dislocation densities in metals. The second …

The Black Performer's Toolbox: A Critical Authoethnography, Laura D. Oliver

LSU Doctoral Dissertations

Blackness shines bright like the moon and beams outside of identity parameters that are limiting in Western society to determine its communicative function inside and outside systems of power. When Blackness intersects with performance, various ways to construct identity are highlighted to expand our understanding of theory and methods that emphasize difference and culture. This research project aims to reimagine Blackness as a performance methodology to explore the performer’s livelihood onstage and constructions of race that impact identity offstage. Additionally, this project is built from a specific method created from the continuous use of expressive work that reflects societal challenges …

Baldcypress (Taxodium Distichum) And Their Growth And Development Under Abiotic Stressors Related To Restoration Efforts, George Washburn

LSU Doctoral Dissertations

Baldcypresss (Taxodium distichum (L.) Rich.) forests are crucial to the Southeast coastal region for the trees’ ecosystem services. Many organizations have been trying to restore the ghost and dead forests found throughout the Gulf region through restoration events. Baldcypress seedlings and saplings face several abiotic and biotic stressors, including but not limited to elevated levels of salinity, nutrients, temperature, and light intensity. These stressors can be the limiting factor in the success or failure of these massive planting efforts.

To assess which stressors were of most concern to the restoration efforts, we conducted common garden experiments with baldcypress seedlings …

Analytic Continuation Of Toeplitz Operators And Commuting Families Of C*-Algebras, Khalid Bdarneh

LSU Doctoral Dissertations

In this thesis we consider the Toeplitz operators on the weighted Bergman spaces and their analytic continuation. We proved the commutativity of the $C^*-$algebras generated by the analytic continuation of Toeplitz operators with special class of symbols that are invariant under suitable subgroups of $SU(n,1)$, and we showed that commutative $C^*-$algebras with symbols invariant under compact subgroups of $SU(n,1)$ are completely characterized in terms of restriction to multiplicity free representations. Moreover, we extended the restriction principal to the analytic continuation case for suitable maximal abelian subgroups of the universal covering group $\widetilde{SU(n,1)}$, and we obtained the generalized Segal-Bargmann transform, where …

Stellar Binaries And Post-Merger Evolution: A Framework For Stellar Evolution And Nucleosynthesis In R Coronae Borealis Stars, Bradley Munson

LSU Doctoral Dissertations

We have developed a framework for simulating binary stars through all three relevant
timescales: the dynamical merger, thermal, and nuclear evolution. The framework begins by simulating a dynamical merger in a 3-dimensional hydrodynamics adaptive mesh refinement code, Octo-Tiger, and performing a spherical averaging calculation to map the post-merger remnant into the 1-dimensional stellar evolution code, MESA. In this work, we primarily utilize this framework for simulating double white dwarf mergers, which are believed to be the progenitor to R Coronae Borealis (RCB) stars. We evolve the post-merger in MESA and compare the computed surface abundances to those observed …

A Multiple Case Study Of Adolescent Piano Students: Examining Motivation Through The Lens Of Interest Development, Carla Lucia Salas Ruiz

LSU Doctoral Dissertations

One way of understanding motivation is through the factors that influence it. These factors analyzed as psychological constructs give rise to the notion of motivation variables such as interest. Interest is a powerful variable that affects student motivation to learn (Hidi & Renninger, 2006; Hulleman et al., 2017; O’Keefe et al. 2017; Renninger & Hidi, 2016; Tin, 2013). In 2006, Hidi and Renninger proposed the “Four-Phase Interest Development Model” for the characterization of interest in learning. According to this model, learners can move from a situational level of interest development to a well-developed individual interest, in a sequential manner. This …

The Impact Of Case Management Intervention For Insured Asthma Patients In Louisiana, An Empirical Study, Mohamed Mohamed Ohaiba

LSU Doctoral Dissertations

Asthma is a chronic condition whose symptoms are managed/prevented using medication and interventions. The overarching objective of this study was to evaluate the impact of patients' demographics on case management enrollment and healthcare utilization, as well as to develop machine learning models to predict high-cost patients.

To accomplish these goals, the Man-Whiteness test, the chi-squares test, logistic regression and odds ratios, and machine learning models were implemented. The average cost of the non-enrolled CM group was significantly higher than the enrolled group (p-value .0001). In addition, the non-enrolled groups had considerably more visits to the emergency department than the other …