Digital Commons Network^™

Tidal-, Wind-, And Buoyancy-Driven Dynamics In The Barataria Estuary And Its Impact On Estuarine-Shelf Exchange Processes, Linlin Cui

LSU Doctoral Dissertations

A three-dimensional, high-resolution, Finite-Volume Coastal Ocean Model (FVCOM) was used to study the dynamics of Barataria Estuary located in the Southeastern Louisiana. Three numerical experiments with different discharge scenarios, including the actual discharge (average ~ 160 m³ s^-1) from the Davis Pond Diversion (DPD) over three months from April to June 2010, no discharge (NO), and the proposed Mid-Barataria Diversion (MBD) with a constant discharge of 850 m³ s^-1, were conducted to investigate the impacts of river diversions on salinity gradients and residence times in the estuary. The three-month average salinity indicated that surface …

Effective Visualization Approaches For Ultra-High Dimensional Datasets, Gurminder Kaur

LSU Doctoral Dissertations

Multivariate informational data, which are abstract as well as complex, are becoming increasingly common in many areas such as scientific, medical, social, business, and so on. Displaying and analyzing large amounts of multivariate data with more than three variables of different types is quite challenging. Visualization of such multivariate data suffers from a high degree of clutter when the numbers of dimensions/variables and data observations become too large. We propose multiple approaches to effectively visualize large datasets of ultrahigh number of dimensions by generalizing two standard multivariate visualization methods, namely star plot and parallel coordinates plot. We refine three variants …

Large Eddy Simulations Of Vertical Jets In Crossflow, Pranaya Pokharel

LSU Doctoral Dissertations

Jets in crossflow (JICF) have applications ranging from oil spill to film cooling of turbine blades. Hence, an understanding of the flow physics is important. The majority of the research has been conducted for low velocity ratios between jet and crossflow with round jets. JICF is demonstrated to behave differently for high velocity ratios and different jet shapes. Circular and rectangular jets are commonly used in aircraft applications. Current study focuses on high velocity ratio JICF issuing from both circular and rectangular exit.

For simulating JICF, an in house code “Chem3D” is used with Large Eddy Simulation (LES) to model …

First-Principles Study On The Catalytic Role Of Cerium Dioxide In The Conversion Of Organic Compounds, Chuanlin Zhao

LSU Doctoral Dissertations

Ceria is an earth-abundant material that has been widely used in heterogeneous catalysis, environmental catalysis, and energy applications thanks for its ability to readily convert between different oxidation states. The objective of this study is to theoretically elucidate the reaction mechanisms for the conversion of model organic compounds on ceria, in order to gain insights for the design of cost-effective and selective ceria-based catalysts. Acetaldehyde, acetic acid, and para-nitrophenyl phosphate monoester were selected as the model compounds to probe ceria surfaces. Density functional theory calculations can provide accurate predictions of adsorption and reaction energetics, which can be used to …

The Socialization Of Students Serving On United States Public Post-Secondary Education Boards, Erin Renee Bendily

LSU Doctoral Dissertations

This study aimed to explain how student members of United States public post-secondary education boards are socialized into their roles and how specific strategies influence their engagement and effectiveness. Researchers have studied student involvement and leadership, including why and how students become involved, individual and institutional benefits, challenges that students experience, and perceptions about students’ involvement in decision-making. Literature also addresses organizational socialization and that of post-secondary education board newcomers, including strategies that organizations use to support their engagement and effectiveness. Little research, however, has been done on the ways in which those boards attempt to support and facilitate students’ …

Teachers As Leaders: An Autoethnographic Account Into The Way That Personal Spirituality Influenced One Teacher's Leadership In A South Louisiana High School, Scott Mckneely Blanchard

LSU Doctoral Dissertations

The purpose of this autoethnographic study is to better understand the role spiritual leaders have in both educational settings and in the motivation of students. An overarching question guides this autoethnographic study: Is spiritual leadership, influenced by Christianity, an appropriate form of mentoring-leadership relationships in public secondary schools? The specific research sub-questions for this study address the following: 1. How do servant leadership and spiritual leadership help create this autonomous learning environment identified by Deci and therefore reduce the number of amotivated students? 2. How can understanding the student as an individual help a teacher confront the issues with motivation …

Non-Parametric Classification Of Time Series Using Permutation Ordinal Statistics, Aldo Duarte Vera Tudela

LSU Master's Theses

The present thesis explores some approaches to classify time series without prior statistical information using the concept of permutation entropy. Motivated by the results from a previous published and relevant work that set similarity relationships between EEG time series, a reproduction of the proposed approach was performed giving negative results. The failure to reproduce those results led to the conclusion that the approach of building statistics from permutation patterns have to be complemented with another metric in order to be used for classification purposes. The concept of Total Variation Distance (TVD) was then used to develop three algorithms to classify …

Taking (Birth) Control: Empowerment Through Contraceptive Education, Meghan Saas

LSU Master's Theses

TAKING (birth) CONTROL is a body of work that educates women on their options for contraceptives, and empowers them to claim their right to choose if—and when—to have a child. Utilizing graphic design and letterpress printing processes, I created a visual system consisting of carefully honed typographic, color, and graphic styles. The bulk of the materials make up an educational toolkit for use at Delta Clinic of Baton Rouge, one of only three remaining abortion providers in Louisiana. Delta Clinic was in need of comprehensive and affordable materials for their patients on the subject of contraception. The toolkit consists of …

Out Of The Shadows The Matriarch Rises: A Case Study Of Women Academic Deans At A Southern, Research One Institution, Jacob Lee Vaughn

LSU Doctoral Dissertations

Abstract

This study examined the experiences of women in higher education as a career as well as the challenges women face in pursuing an appointment as Dean of a college. Selected participants were interviewed to gather data from their own narratives about the experiences and challenges as current women Deans in higher education. Each participant attributed their success to family support and proper mentoring, while highlighting institutional policies acting as a form of gendered oppression. Recommendations were suggested to higher educational representatives and legislators concerning the correction of the gendered environment favoring the advancement of men into a more equitable …

Soybean Response To Dicamba: Associated Injury Criteria And Development Of A Model To Predict Yield Loss, Matthew Ryan Foster

LSU Doctoral Dissertations

In research conducted using indeterminate soybean [Glycine max (L.) Merr.], fourteen injury criteria observed following dicamba at 0.6 to 280 g ae ha^-1 (1/1000 to ½ of 560 g ha^-1 use rate) were rated using a scale of 0= no injury, 1= slight, 2= slight to moderate, 3= moderate, 4= moderate to severe, and 5= severe. Greatest crop injury 15 d after treatment (DAT) was observed following dicamba applied at 0.6 to 4.4 g ha^-1 at V3/V4 for upper canopy pale leaf margins (3.8 to 4.2) and at R1/R2 for terminal leaf cupping (4.1 to 5.0) …

Observation Of High-Energy Gamma-Rays With The Calorimetric Electron Telescope (Calet) On-Board The International Space Station, Nicholas Wade Cannady

LSU Doctoral Dissertations

The CALorimetric Electron Telescope (CALET) is a multi-instrument high-energy astrophysics observatory deployed to the International Space Station (ISS) in August 2015. The primary instrument is the calorimeter (CAL), which is intended for measurement of the cosmic ray electron flux in the energy range 10 GeV - 20 TeV. The CAL is also sensitive to gamma-rays in the energy range 1 GeV - 10 TeV and protons and nuclei up to PeV energies. Also present on the CALET payload are an Advanced Stellar Compass (ASC) for the fine determination of the pointing direction and the CALET Gamma-ray Burst Monitor (CGBM) for …

Credit Securities From An Information Perspective, Meredith E. Rhodes

LSU Doctoral Dissertations

In this dissertation, I present three studies that independently contribute to the literature on credit securities from an information perspective. In the first chapter, I examine the informational role of exchange-traded funds (ETFs) to the corporate bond market. Considering the dramatic growth of ETFs and the fact that they trade on exchanges, I posit that ETFs provide information to market participants about the underlying market, but not all information provided may be relevant. Indeed, I show that higher levels of ETF ownership of bonds are associated with lower transactions costs, higher liquidity, but also contain less firm-specific information.

In the …

Reinforcement Learning In Robotic Task Domains With Deictic Descriptor Representation, Harry Paul Moore

LSU Doctoral Dissertations

In the field of reinforcement learning, robot task learning in a specific environment with a Markov decision process backdrop has seen much success. But, extending these results to learning a task for an environment domain has not been as fruitful, even for advanced methodologies such as relational reinforcement learning. In our research into robot learning in environment domains, we utilize a form of deictic representation for the robot’s description of the task environment. However, the non-Markovian nature of the deictic representation leads to perceptual aliasing and conflicting actions, invalidating standard reinforcement learning algorithms. To circumvent this difficulty, several past research …

Thermal And Mechanical Energy Harvesting Using Lead Sulfide Colloidal Quantum Dots, Taher Ghomian

LSU Doctoral Dissertations

The human body is an abundant source of energy in the form of heat and mechanical movement. The ability to harvest this energy can be useful for supplying low-consumption wearable and implantable devices. Thermoelectric materials are usually used to harvest human body heat for wearable devices; however, thermoelectric generators require temperature gradient across the device to perform appropriately. Since they need to attach to the heat source to absorb the heat, temperature equalization decreases their efficiencies. Moreover, the electrostatic energy harvester, working based on the variable capacitor structure, is the most compatible candidate for harvesting low-frequency-movement of the human body. …

Velocity-Resolved Reverberation Mapping Of Five Bright Seyfert 1 Galaxies, G. De Rosa, M. M. Fausnaugh, C. J. Grier, B. M. Peterson, K. D. Denney, Keith Horne, M. C. Bentz, S. Ciroi, Elena Dalla Bontà, M. D. Joner, S. Kaspi, C. S. Kochanek, R. W. Pogge, S. G. Sergeev, M. Vestergaard, S. M. Adams, J. Antognini, C. Araya Salvo, E. Armstrong, J. Bae, A. J. Barth, T. G. Beatty, A. Bhattacharjee, G. A. Borman, T. A. Boroson, M. C. Bottorff, J. E. Brown, J. S. Brown, M. S. Brotherton, C. T. Coker, C. Clanton, V. Cracco, S. M. Crawford

Faculty Publications

We present the first results from a reverberation-mapping campaign undertaken during the first half of 2012, with additional data on one active galactic nucleus (AGN) (NGC 3227) from a 2014 campaign. Our main goals are (1) to determine the black hole masses from continuum-Hβ reverberation signatures, and (2) to look for velocity-dependent time delays that might be indicators of the gross kinematics of the broad-line region. We successfully measure Hβ time delays and black hole masses for five AGNs, four of which have previous reverberation mass measurements. The values measured here are in agreement with earlier estimates, though there is …

R1 Retrotransposons In The Nucleolar Organizers Of Drosophila Melanogaster Are Transcribed By Rna Polymerase I Upon Heat Shock, Himanshu S. Raje, Molly E. Lieux, Patrick J. Dimario

Faculty Publications

The ribosomal RNA genes (rDNA) of Drosophila melanogaster reside within centromere-proximal nucleolar organizers on both the X and Y chromosomes. Each locus contains between 200–300 tandem repeat rDNA units that encode 18S, 5.8S, 2S, and 28S ribosomal RNAs (rRNAs) necessary for ribosome biogenesis. In arthropods like Drosophila, about 60% of the rDNA genes have R1 and/or R2 retrotransposons inserted at specific sites within their 28S regions; these units likely fail to produce functional 28S rRNA. We showed earlier that R2 expression increases upon nucleolar stress caused by the loss of the ribosome assembly factor, Nucleolar Phosphoprotein of 140 kDa (Nopp140). …

The Use Of Systematic Distractions To Increase Sustained Attention In School-Aged Children With Attention Problems, Emma Larson

LSU Master's Theses

With the growing prevalence of Attention Deficit Hyperactivity Disorder (ADHD) in children (DSM-5, 2013), it has been established that the ability of these children to sustain attention is marked with difficulty (Barkley, 2006). Prior research has addressed the need to increase sustained attention in children with ADHD, however, not all of the promising methods take into consideration that children with ADHD have difficulty ignoring distractions (Rapport et al., 2009). This is problematic because the typical classroom environment is filled with distractions. The current study attempted to fill this research gap by training participants to sustain attention while systematically introducing distractions …

Evaluation Of Oral Function Before And After Frenectomy In Breastfed Infants Diagnosed With Tethered Oral Tissue, Cindy L. Parr

LSU Doctoral Dissertations

Assessment and treatment of tethered oral tissue, or tongue tie, vary within and across providers, resulting in inconsistent surgical and therapeutic outcomes. Assessment and treatment have historically focused on the anatomical (structural) underpinnings of tongue tie, as opposed to the physiological (functional) aspects that can affect daily activities. This is particularly noteworthy in the infant population in regards to breastfeeding. Clinical findings, however, suggest that connections exist between tongue tie and a variety of other oral functions that go beyond breastfeeding. The goal of this research was to examine a relatively small group of breastfed infants with tethered oral …

Hurricanes As A Major Driver Of Coastal Erosion In The Mississippi River Delta: A Multi-Decadal Analysis Of Shoreline Retreat Rates At Bay Champagne, Louisiana (Usa), Marianne Dietz, Kam-Biu Liu, Thomas Bianchette

Faculty Publications

No abstract provided.

Liquid Jet Penetration And Breakup In A Free Supersonic Gas Jet, Hansen Jones

LSU Master's Theses

In the testing of today’s rocket engines, both on large scale vertical test stands and smaller subscale horizontal component testing stands, it is extremely important to be able to accurately quantify and mitigate the thermal and acoustic loads the engines will generate on test stand infrastructure. Due to the large number of parameters that must be considered for many cases, development of a multi-phase computational code is under way to properly analyze and design water spray cooling systems used at NASA’s Stennis Space Center (SSC) and across other NASA centers. As such, a small-scale experiment has been conducted at Louisiana …

Influence Of Salinity, Sunlight, And Sediment On The Toxicity Of Pesticides In Three Non-Target Organisms, Emily Noelle Vebrosky

LSU Doctoral Dissertations

Pesticides used in the United States must undergo registration by the United States Environmental Protection Agency (USEPA), after a multitude of analyses ranging from environmental fate to aquatic toxicological impacts to human risk exposure. Testing varies for each chemical, some requiring more testing than others. In many cases, environmental factors are restricted in the analysis of chemical behavior and organismal testing is limited to larvae. Many pesticides are formulated to breakdown in the environment by means of photolysis, hydrolysis, or oxidation, either to ensure low-persistence, limited transport, or to form the active ingredient (pro-pesticides). Environmental influences on chemical behaviors include …

Landscapes Of Persistence And Ritual Architecture At The Cosma Complex, Upper Nepeña Valley, Peru., Kimberly Elizabeth Munro

LSU Doctoral Dissertations

This dissertation focuses on the Cosma Complex, a multi-component archaeological site located at the headwaters of the Nepeña River, on the western slopes of the Cordillera Negra in the modern Department of Ancash, Peru. The overarching goal of this study is to understand not only Cosma’s influence as a religious center within the Nepeña Valley and the surrounding region, but its recurring occupation over a 5000-year time span and its role in religious networks within the valley through its function as a cultural landscape resource or persistent place.

The Cosma complex extends over 250 hectares and includes two multi-storied temple …

Effective Methods And Tools For Mining App Store Reviews, Nishant Jha

LSU Doctoral Dissertations

Research on mining user reviews in mobile application (app) stores has noticeably advanced in the past few years. The main objective is to extract useful information that app developers can use to build more sustainable apps. In general, existing research on app store mining can be classified into three genres: classification of user feedback into different types of software maintenance requests (e.g., bug reports and feature requests), building practical tools that are readily available for developers to use, and proposing visions for enhanced mobile app stores that integrate multiple sources of user feedback to ensure app survivability. Despite these major …

Proton Therapy For Adults With Mediastinal Lymphomas: The International Lymphoma Radiation Oncology Group Guidelines, Bouthaina Shbib Dabaja, Bradford S. Hoppe, John P. Plastaras, Wayne Newhauser, Katerina Rosolova, Stella Flampouri, Radhe Mohan, N. George Mikhaeel, Youlia Kirova, Lena Specht, Joachim Yahalom

Faculty Publications

Among adult lymphoma survivors, radiation treatment techniques that increase the excess radiation dose to organs at risk (OARs) put patients at risk for increased side effects, especially late toxicities. Minimizing radiation to OARs in adults patients with Hodgkin and non-Hodgkin lymphomas involving the mediastinum is the deciding factor for the choice of treatment modality. Proton therapy may help to reduce the radiation dose to the OARs and reduce toxicities, especially the risks for cardiac morbidity and second cancers. Becauseproton therapymay have some disadvantages, identifying the patients and the circumstances that may benefit the most from proton therapy is important. We …

A Note On The Knot Floer Homology Of Fibered Knots, John A. Baldwin, David Shea Vela-Vick

Faculty Publications

We prove that the knot Floer homology of a fibered knot is nontrivial in its next-to-top Alexander grading. Immediate applications include new proofs of Krcatovich’s result that knots with L–space surgeries are prime and Hedden and Watson’s result that the rank of knot Floer homology detects the trefoil among knots in the 3–sphere. We also generalize the latter result, proving a similar theorem for nullhomologous knots in any 3–manifold. We note that our method of proof inspired Baldwin and Sivek’s recent proof that Khovanov homology detects the trefoil. As part of this work, we also introduce a numerical refinement of …

Coupled Chemical Pre-Oxidation And Aerobic Bioremediation Of Buried Mc252 Oil Across A Headlands Beach Profile, Olivia Bramlet

LSU Master's Theses

The release of MC252 crude oil following the Deepwater Horizon event has emphasized the need to investigate factors controlling the extent of contamination degradation in coastal environments. Dam structures created on Fourchon Beach, LA established conditions for PAH and n-alkane accumulation and burial along a vertical profile that persists today due to the anaerobic, often anoxic, and hypersaline conditions of the groundwater. The ability to remove the oxygen limitation present on in situ aerobic biodegradation of buried petroleum-based hydrocarbons in this environment was investigated through the coupled process of chemical oxidation and enhanced bioremediation using a proprietary formulation of activated …

Computational Aerodynamics And Anatomical Characterization Of Laryngotracheal Stenosis In Children, William Poynot

LSU Master's Theses

Laryngotracheal stenosis (LTS) is a health condition in which an obstruction in the upper trachea can cause breathing difficulties and increased incidence of infection, among other symptoms. Occurring most commonly due to intubation in infants, LTS often requires corrective surgery. Currently, clinical methods of assessing the blockage region are simplistic and subjective, and it is challenging to determine the most effective surgical strategy for any given patient. In the present work, a comprehensive methodology is proposed for characterizing the stenosis region both in terms of its anatomical parameters and its corresponding aerodynamic properties. The combination of computational fluid dynamics (CFD) …

Partner Gender As A Predictor Of Relationship Satisfaction, Sexual Satisfaction, Relationship Commitment, And Attachment Identity Among Women, Amy Leigh Wright

LSU Doctoral Dissertations

Previous research examining overall relationship satisfaction, relationship commitment, and sexual satisfaction among heterosexual women is well-documented. The theoretical foundation of attachment has also been well-established within relationship research among heterosexual women. However, little to no published reports examine such variables among women currently in same-sex relationships. Furthermore, virtually no reports assess for any differences in attachment identity based on the gender of women’s romantic partners. This study therefore sought to identify any interrelationships between relationship satisfaction, relationship commitment, sexual satisfaction, and attachment identity (measured using the dimensions of avoidance and anxiety) among two groups of women based on their partner’s …

Angle Dependence Of Strong-Field Single And Double Ionization Of Carbonyl Sulfide, Péter Sándor, Adonay Sissay, François Mauger, Paul M. Abanador, Timothy T. Gorman, Timothy D. Scarborough, Mette B. Gaarde, Kenneth Lopata, Kenneth J. Schafer, Robert R. Jones

Faculty Publications

© 2018 American Physical Society. We have studied, experimentally and theoretically, the ionization probability of carbonyl sulfide (OCS) molecules in intense linearly polarized 800-nm laser pulses as a function of the angle between the molecular axis and the laser polarization. Experimentally, the molecules are exposed to two laser pulses with a relative time delay. The first, weaker pulse induces a nuclear rotational wave packet within each molecule such that the ensemble exhibits preferential alignment in the laboratory frame at specific times. The second, stronger pulse induces ionization, and the variation in single and double ionization yields is measured as a …

Angle Dependence Of Strong-Field Single And Double Ionization Of Carbonyl Sulfide, Péter Sándor, Adonay Sissay, François Mauger, Paul M. Abanador, Timothy T. Gorman, Timothy D. Scarborough, Mette B. Gaarde, Kenneth Lopata, Kenneth J. Schafer, Robert R. Jones

Faculty Publications

We have studied, experimentally and theoretically, the ionization probability of carbonyl sulfide (OCS) molecules in intense linearly polarized 800-nm laser pulses as a function of the angle between the molecular axis and the laser polarization. Experimentally, the molecules are exposed to two laser pulses with a relative time delay. The first, weaker pulse induces a nuclear rotational wave packet within each molecule such that the ensemble exhibits preferential alignment in the laboratory frame at specific times. The second, stronger pulse induces ionization, and the variation in single and double ionization yields is measured as a function of the delay between …