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Theoretical Investigation Of The Ring Opening Of Cyclohexane On Ir(111) And Pt(111), Kushal Ghale

LSU Master's Theses

Diesel engines have higher fuel efficiency and can burn cleaner than gasoline engines. To enhance quality of diesel fuels as measured by the cetane number (CN), the removal of aromatic compounds is necessary. A potentially highly efficient approach would be to convert aromatics to saturated cycloparaffin, followed by selective ring opening to linear or branched alkanes, to increase the CN. Here the focus of the project is to study the mechanism of metal-catalyzed ring opening (RO) of cyclohexane (denoted CHA, or c-C₆H₁₂) through theoretical and computational modeling. CHA, a simplest cycloparaffin, is used as probe molecule …

String Out And Compressibility Effect On Pressure Rise In A Shut-In Well, Nicholas Henry

LSU Master's Theses

Gas kick migration experiments were performed in a small-scale well prototype model of annular geometry to analyze the behavior of gas kicks in highly non-Newtonian fluids. The objective was to isolate and estimate the effects system compressibility and bubble string out have on the pressure build up in a situation in which a gas kick rises through a noncirculating drilling mud in a vertical well.

The experiments consisted of 2 tests. The first test measured the apparent compressibility of the liquid phase of the experiment – that phase which simulated the drilling mud in a gas kick situation. The second …

Disentangling The Role Of Future Orientation And Callous-Unemotional Traits In The Prediction Of Offending In Justice-Involved Youth, Toni Walker

LSU Master's Theses

Future Orientation and callous-unemotional (CU) traits are well established predictors of future offending. A more positive outlook on one’s future goals seems to protect youth from engaging in antisocial behavior, whereas elevated CU traits predict more severe and persistent forms of delinquency. The relationship between CU traits and other aspects of psychopathy, such as grandiose self-worth, is not consistent with a pessimistic outlook towards the future. This study explored the associations among these variables in a sample of male first-time juvenile offenders (N = 1,216). Results indicated that future orientation predicted delinquency over a 5-year follow-up period, and this …

Surface Gravity Waves In The Gulf Of Mexico And Their Role In Ocean-Atmosphere Coupling, Ehsan Abolfazli

LSU Master's Theses

This study provides an overview of the surface gravity wave dynamics in the Gulf of Mexico (GoM) using numerical simulations. The focus is on the effects of ocean currents on waves, and the geographic distribution of a set of wave statistics and parameters related to the role of waves on both sides of the ocean-atmosphere interface. Simulations are performed using the Simulating WAves Nearshore (SWAN) model with and without coupling with the Regional Ocean Modeling System (ROMS) model within the Coupled Ocean Atmosphere Wave Sediment Transport (COAWST) framework. In the GoM, currents alter the climatological significant wave heights (H …

Impacts Of Anthropogenic Activities On Coastal Wetland Microbes And Microbially-Mediated Processes In Coastal Louisiana, Jessica Vaccare

LSU Master's Theses

Louisiana contains 40% of the nation’s coastal wetlands, but accounts for 80% of the nation’s coastal wetland loss. This loss is attributed to eustatic sea level rise (SLR), regional land subsidence, and sediment starvation. The relative SLR in coastal Louisiana (~13 mm yr^-1) puts this area within the predicted level of SLR for most other coastlines in the next 65-85 years; and makes current coastal Louisiana an ideal proxy for studying the future impacts of SLR, wetland loss, and anthropogenic activities on coastal ecosystems worldwide.

There are approximately 1,500 oil spills reported for Louisiana every year and the …

Effects Of A Repeated Writing Intervention On Writing Fluency And Writing Quality, Katherine L. Moore

LSU Master's Theses

Writing is a fundamental skill that is essential for students’ academic success. In fact, students with writing difficulties are shown to have lower academic achievement and reduced likelihood of college acceptance (Graham & Perin, 2007). Writing fluency is a crucial component in the development of writing abilities, as it allows for the development of higher-order writing skills (Bloom, 1986, Binder, Haughton & Bateman, 2002). Limited research exists of interventions targeted specially for writing fluency; however, performance feedback procedures have been shown as effective (Hier & Eckert, 2016). Literature suggests the skills of reading and writing share similar processes of learning …

Improving Coupled Enzyme Assays With Capillary Electrophoresis, Thu Hoai Nguyen

LSU Doctoral Dissertations

The goal of this project is to address limitations of coupled enzyme assays using capillary electrophoresis (CE). In some enzyme assays, it is ineffective to directly detect products and substrates spectroscopically (absorption or fluorescence). Coupling the enzyme-catalyzed reaction of interest with another enzyme-catalyzed reaction allows for indirect detection of product formation or substrate depletion for the target enzyme. While conventional coupled enzyme assays are facile for kinetic measurements, they can be problematic for inhibition screening due to spectral and inhibitor interferences. To address these limitations of coupled assays, CE has been used to develop enzyme assays for acetyl-coenzyme A carboxylase …

Effect Of Environmental Factors And Residual Sanitizers On Survival And Attachment Of Indicator Organism And Human Pathogens On Fresh Produce, Vijay Singh Chhetri

LSU Doctoral Dissertations

A comprehensive understanding of the behavior of microbial contaminants on produce surfaces in agricultural farms and during post-harvest activities is essential for the development of produce safety risk management strategies. Our studies investigated the survival and the attachment of E. coli on watermelon surfaces in agricultural settings with different levels of vegetation, and the effect of residual sanitizers on the survival and the attachment of E. coli O157: H7 and L. monocytogenes on spinach leaves. The attachment strength (S_R) of the E. coli cells on watermelon surfaces significantly increased (P<0.05) from 0.04 to 0.99 in the first 24 h, which was primarily due to the decrease in loosely attached population, given that the population of strongly attached cells was constant. The daily die-off rate of E. coli ranged from -0.12 …

Blueberry Pectin-Anthocyanin Binding Kinetics And Stability Under In Vitro Digestion, Jee Won Koh

LSU Doctoral Dissertations

Blueberry pectins were sequentially extracted from highbush blueberry powder and precipitated in alcohol to obtain water soluble fraction (WSF) and chelator soluble fraction (CSF). WSF was high methoxyl pectin (degree of esterification: 53), rich in in neutral sugars (40 mol%), and had less negative charge (-21 mV) whereas CSF was low methoxyl pectin (degree of esterification: 21), rich in uronic acids (92 mol%), and had lower negative charge ( -26 mV).

The stability of blueberry pectin-anthocyanin complex was investigated under simulated in vitro digestion. Binding of blueberry pectins with three anthocyanin standards (malvidin-3-glucoside; M3G, cyanidin-3-glucoside; C3G, and delphinidin-3-glucoside; D3G) and …

Sensory Analysis For Determining The Influence Of Visual Stimuli Upon Eating Experiences, Pitchayapat Chonpracha

LSU Doctoral Dissertations

Consumers are currently more conscious about salt and sugar intake than they were in the past. Visual cues have been shown to impact consumers’ cognitive and their taste perceptions. Current research information about visual cues enhancing human’s tastes expectation of saltiness and sweetness is limited. The sophisticated sensory analysis for products containing a reduced amount of salt and sugar is undoubtedly time–consuming and costly if the sensory experiment is designed with many samples. Therefore, the following three studies were achieved: I) an examination of how intrinsic and extrinsic visual cues affect the overall consumer eating experiences; II) a comparison of …

The Use Of Cellulose Nanofibers In Polymer Matrix Composites Via 3d Printing, Ju Dong

LSU Doctoral Dissertations

Filament fused fabrication (FFF) is an extrusion-based 3D printing technology for manufacturing thermoplastic polymers. A major obstacle of 3D printed thermoplastic is the limited crystallinity resulting from a fast quench while material leaving the hot nozzle and solidifying quickly at the low-temperature platform. As a result, the mechanical performances of 3D printed thermoplastic is normally inadequate in comparison with conventionally manufactured ones (e.g., from injection molding). In this work, we developed two strategies for reinforcing and functionalizing 3D printed thermoplastic composites using cellulose nanofibers (CNFs) as nanofillers. Firstly, L-lactide monomers were grafted onto CNFs via ring-opening polymerization. The synthesized poly(lactic …

Vulnerability Of Industrial Facilities In The Lower Mississippi River Industrial Corridor To Relative Sea Level Rise And Tropical Cyclone Storm Surge, Joseph Blake Harris

LSU Doctoral Dissertations

Relative sea level rise (RSLR) and tropical cyclone-induced storm surge are major threats to the Lower Mississippi River Industrial Corridor (LMRIC) which has approximately 120 industrial complexes located within the corridor. Spatial interpolation methods were applied to the 2004 National Oceanic and Atmospheric published Technical Report #50 subsidence dataset and cross-validation techniques were used to determine the accuracy of each method. Digital elevation models (DEMs) were created for the years 2025, 2050, and 2075, based on these predictive surface of subsidence rates. Future DEMs were utilized to model RSLR and determine the extent of storm surge on the LMRIC by …

Use Of A Behavioral Health Framework To Assess Perceptions Of Hurricane Evacuation Support Services In New Orleans, Louisiana, Aubry Kyle

LSU Doctoral Dissertations

This dissertation presents research conducted during the hurricane seasons of 2017 and 2018 in New Orleans, Louisiana. The research’s purpose was to assess citizen perceptions of evacuation support services offered during mandatory evacuation events. A prospective quantitative survey and qualitative, open-ended, semi-structured interview assessed perceptions. Both research methods were designed and assessed using the constructs of the Health Belief Model, a public health model created to assess perceived barriers, benefits, risks, severity, self-efficacy, and cues to action regarding health programming. Quantitative research yielded 211 surveys, representing opinions of New Orleans residents within 1-km Euclidian distance of an evacuation pick-up marker. …

Microscale Metal Forming: Mesoscopic Size Effect, Extrusion And Molding, Bin Zhang

LSU Doctoral Dissertations

The continuing trend of metallic device and product miniaturization has motivated studies on microscale metal forming technologies. A better understanding of materials’ mechanical response and deformation behavior is of importance for the design and operation of micro metal forming processes. In this dissertation, uniaxial compression testing was conducted on Al ring and pillar specimens with characteristic dimensions at meso to micro scales. The experimental data reveal inadequacies of the existing surface layer model and provides a baseline for delineating deformation mechanisms in micro metal forming operations. Microscale reverse extrusion experiment was carried out on Cu and Al rod specimens with …

Between Regulation And Repression, Tradition And Innovation: How The Royal College Of Physicians Of London Negotiated Its Place In The Early Modern Medical Field, Erin Michelle Halloran

LSU Doctoral Dissertations

This project seeks to understand the methods employed by the College of Physicians to maintain its authority and privileges in the English medical marketplace in the sixteenth and early seventeenth centuries. The College of Physicians was founded in 1518 by Dr. Thomas Linacre, whose medical humanist ideals became the framework for the College’s organization and statutes. The College was tasked with regulating the medical practice of practitioners in London. Physicians licensed by the College were, by law the only physicians allowed to practice internal medicine in London and the surrounding seven miles. It examined and licensed physicians and scrutinized and …

Infrared Laser Ablation For Biomolecule Sampling, Kelin Wang

LSU Doctoral Dissertations

In this research, an infrared laser at a wavelength of 3 µm was used to ablate material from tissue sections for biomolecule analysis. Pulsed infrared (IR) irradiation of tissue with a focused laser beam efficiently removed biomolecules, such as proteins, enzymes, DNA, and RNA from tissue sections for further analysis. In a proteomics project, matrix-assisted laser desorption/ionization mass spectrometry imaging (MALDI-MSI) was used to determine regions of interest (ROI) for laser ablation. The matrix was then washed off. By overlaying the MSI generated heat-map, the section was sampled using IR laser ablation and custom stage-control software. Two ROI were selected …

Quantitative Evaluation Of A Lightweight Sediment For A Physical Model Of The Lower Mississippi River, Mauricio Hooper

LSU Doctoral Dissertations

The Lower Mississippi River Physical Model (LMRPM), housed at the LSU Center for River Studies on the Baton Rouge, LA Water Campus, is a distorted, movable bed model comprising the lower 195 miles of the Mississippi River from Donaldsonville through the Head of Passes into the Gulf of Mexico. Since the LMRPM was designed to replicate the hydraulics (i.e., flow and river stages) and bulk non-cohesive sediment transport, the model lightweight sediment must replicate both the incipient motion and two-dimensional dune characteristics (height and length). In addition, the model scale and distortion require that the sediment time scale be determined …

Cationic Cobalt (Ii) Hydroformylation, Drew Michael Hood

LSU Doctoral Dissertations

While investigating a bimetallic cobalt hydroformylation catalyst a new class of monometallic cationic cobalt (II) hydroformylation catalyst were discovered. These newly discovered catalyst proved to be very unique with high hydroformylation activity under mild conditions. The pre-catalyst were characterized using various methods including NMR, EPR, MS, and X-ray crystallography. Similarly the active catalyst was also investigated using NMR, EPR, FTIR, and X-ray crystallography. Various catalyst modifications were investigated for their effects on hydroformylation activity. Likewise various reaction parameters were probed to determine their effect on hydroformylation activity. Finally the best cationic cobalt (II) catalyst were directly compared to industry standards …

The Modern Mississippi: Provenance Indicators And Human Impact, Brittney Anne Gregory

LSU Doctoral Dissertations

Given the significant degree to which the modern Mississippi River and its tributaries have been altered through dams, levees, and diversions, it is important to understand how sediment is transported from source to sink. The objective of this dissertation is to explore how the modern Mississippi River transports sediment from its tributaries to its delta using three independent proxies. Provenance indicators have traditionally been an effective way with which to characterize sediment transport in large river systems. First, detrital U-Pb zircon dating is used to investigate modern flux and possible anthropogenic influences on coarse-grained sediment within the modern Mississippi River. …

Effective Tax Rates For Multinational And Domestic Corporations: A Closer Examination, Allen Lee Ryan

LSU Doctoral Dissertations

This study investigates the differences in effective tax rates between U.S. multinational corporations and U.S. domestic corporations during the past 30 years. In a recent article published in the Journal of Financial Economics, Dyreng et al. (2017) found that cash effective tax rates for U.S. multinational and U.S. domestic corporations have been declining since 1988. The authors also found that multinational corporations show a higher cash effective tax rate when compared to domestic corporations. Using federal and state effective tax rates, I first examine the difference between these tax rates for multinational and domestic corporations. I find mixed results …

Essays On Education And Crime, Swarup Joshi

LSU Doctoral Dissertations

Education is considered one of the most important tools for success in the labor market. The benefits of education extend to multiple other externalities. However, access to education is not universal even within the same school, county, and state. This dissertation includes three different essays which looks at the literature on intervention programs, an intervention program to increase access to post secondary education, and impact of education on crime. The first chapter investigates the literature on intervention programs, their costs and impacts. It also discusses the literature connecting education and crime. The second chapter details the intervention program studied in …

Identification And Characterization Of Novel Transporters Involved In The Co2 Concentrating Mechanism Of Chlamydomonas Reinhardtii, Ananya Mukherjee

LSU Doctoral Dissertations

The green alga Chlamydomonas reinhardtii possesses a CO₂ concentrating mechanism (CCM) which helps in successful acclimation to low CO₂ conditions. One of the main aspects of the CCM is bringing in inorganic carbon (Ci) into the cell as bicarbonate using Ci transporters. Current models of the CCM postulate that a series of ion transporters bring HCO₃^- from outside the cell to the thylakoid lumen where the carbonic anhydrase, CAH3, dehydrates accumulated HCO₃^- to CO₂, raising the CO₂ concentration for Rubisco. Previously, HCO₃^- transporters have been identified at both the …

Multiple Voices In The Poetry Of Transculturation: Reading Contemporary Ex-Phonic Poetry Through Muwaššah: Ryoko Sekiguchi, Etel Adnan, And Suheir Hammad, Thana Al-Shakhs

LSU Doctoral Dissertations

This research is a comparative study that compares two types of multicultural poetry: contemporary poetry written by non-native speakers and the Andalusian medieval genre of muwaššah. In spite of the cultural and temporal gap between the two periods, the poets apply similar strategies to represent multicultural voices, for example integrating foreign expressions. I argue that multicultural poetics break the rules of classical writing and use oral expressions that are more flexible to include different languages and cultural references. This study focuses on oral techniques that offer an appropriate style to express multiplicity.

This thesis is divided into four chapters. …

Spatial And Temporal Patterns Of Ecological Succession And Land Development Along A Coastal Deltaic Floodplain Chronosequence, Anika Abena Campbell Aarons

LSU Doctoral Dissertations

Coastal deltaic floodplain development occurs when riverine sediment delivery to coastal margins facilitates land accretion at a rate that exceeds the combined effect of eustatic sea level rise and geologic subsidence, leading to an actively prograding deltaic landscape. In a coastal setting environmental conditions are driven by river discharge, winds, tides and vegetation. The combination of these physical and biological forces over time creates a spatial heterogeneity in the landscape, which determines patterns of ecological succession. These successional changes are recorded in the soils and sediments of the delta and occur along age and elevation gradients. I described spatial and …

The Garbage That We Eat: Metabolizing Food-Waste In New Orleans, Louisiana, Kelly L. Haggerty

LSU Master's Theses

The 2017 Climate Action for a Resilient New Orleans report strives to divert 50 percent of waste by 2030. In the same year, waste companies had only managed to divert 5 percent of the total annual waste in Orleans Parish. Nearly a decade away from 2030, city officials have not even tested or implemented strategies to reach this goal. While city officials scramble to launch pilot projects, community and grassroots organizations center around recovering and transforming garbage and food waste. Using interviews and surveys with food-waste organizers from May to August 2018, this paper reveals that managing food-waste on a …

A Comprehensive Techno-Economic Framework For Shale Gas Exploitation And Distribution In The United States, Jorge Asis Charbel Chebeir

LSU Doctoral Dissertations

Over the past years, shale gas has turned into one of the most significant sources of energy in the United States. Technological advancements have provided the energy industry with the necessary tools to allow the economic exploitation of an enormous volume of natural gas trapped in shale formations. This has boosted the domestic gas production and generated a boom in other sectors of the economy in the country. However, major challenges are involved in the development of shale gas resources. A drastic decline of wells’ productivity, the costs involved in the gas production and distribution facets, and the volatile behavior …

Deltaic Wetland Dynamics From Seasonal To Centennial Scales, Giancarlo A. Restreppo

LSU Doctoral Dissertations

The lower plain of the Mississippi River Delta contains approximately five coastal sedimentary basins that are topographically defined, and one shelf-crossing depocenter (the Birds Foot Delta). These depositional systems receive varying quantities of sediment from fluvial and marine sources and have rates of coastal land loss that are roughly inversely proportional to fluvial sediment supply. To combat land loss along these regions, Louisiana has launched a historic campaign to sustain and regrow coastal lands using, in part, river sediment diversions. Fine sediments constitute the majority of sediment load in the Mississippi River, but are under-studied with respect to dispersal processes, …

A Niche Of Her Own: The Nine Piano Preludes Of Ruth Crawford Seeger, Joshua Medrano

LSU Doctoral Dissertations

For a large part of music history, women composers like Ruth Crawford Seeger (1901 1953) were easily overlooked. Often, their music and ambitions in contributing to the repertoire were not taken seriously by the masses. Instead, they tended to be disregarded in comparison to the great many male figures that have prevailed through the years. Through gaining an understanding of Crawford Seeger as a woman from upbringing until death, her compositional style, specifically focusing on her first distinctive style period during her years studying in Chicago from 1921-1929, and also through hands on learning of the Nine Preludes that will …

A Pedagogical And Performance Approach To A Selection Of Piano Solo Pieces Written By Chen Yi And Zhou Long, Weiying Tang

LSU Doctoral Dissertations

This dissertation will focus on the performance and pedagogical features of six piano solos composed by Chen Yi and Zhou Long. Both composers are Chinese-American who earned their Bachelor degrees in music from the Central Conservatory in Beijing, and came to United States in 1985-1986 to pursue doctoral studies in composition at Columbia University. Because of the composers’ personal experience, they were not only familiar with Chinese regional folk elements, but also trained in the Western classical music tradition. Their works tend to blend and expand both Chinese and Western cultural traditions, musical ideas and techniques.

The six piano solo …

Sonata For Violin And Piano By John Corigliano: A Performance Guide, Xinyu Yang

LSU Doctoral Dissertations

John Corigliano is one of the most famous American composers of modern times having gained global recognition over the course of his career. The focus of this dissertation is on one of his earlier works, the Sonata for Violin and Piano. This sonata is the first of his compositions to have gained international attention. In the Sonata for Violin and Piano, Corigliano uses traditional music elements that are accessible to the audience. Although it is based on the traditional composition, Corigliano uses ambiguous tonality, polytonality, complicated rhythm, and polyrhythm throughout the piece. These factors cause several technical issues which occur …