Digital Commons Network^™

Research On 3d Printing Resin Exposure Properties And Its Application On Centrifugal Microfluidic Platform Based On Fluorescence Detection, Zheng Qiao

LSU Doctoral Dissertations

This dissertation encapsulates significant advancements in the field of SLA 3D printing and centrifugal microfluidics. Central to the research is the development of a novel mathematical model for predicting trapped resin thickness in SLA 3D printing, a groundbreaking contribution that addresses a critical aspect of printing intricate structures. This model, the first to establish a mathematical relationship for resin thickness, is rooted in a comprehensive study of the resin curing process. The research leverages the concept of 'critical dosage' for resin curing, leading to a more refined and theoretically grounded approach for calculating curing thickness. Experimentation further validates the model, …

Seeking A Uniform Approach To Trumpet Sound Concept, Coleman T. Scott

LSU Doctoral Dissertations

One of the most challenging aspects of trumpet playing that pedagogues must teach is how to produce a professional tone. Trumpet students are often good musicians, play correct notes and rhythms, and even have proficient technique. However, many are unable to consistently produce a tone comparable to that of a professional. There are a number of methods that can be utilized to improve a student’s tone quality. In my own teaching and in the teaching of many professionals, tone concept has been used as a catalyst for the improvement of tone quality. A students’ exposure to a professional-quality trumpet tone …

Building The Church Of San Vitale In Ravenna, Italy, Sally S. Morgan

LSU Master's Theses

This thesis uses the evidence concerning the design and building of the Church of San Vitale in Ravenna to reconstruct, as far as it is possible, the sequence of decisions, activities, and methods that led to the construction of the church, made of bricks and mortar, and whose interiors are covered by glorious colored mosaics and marbles. The historiography on the Church of San Vitale begins with the historian Agnellus, who wrote the Liber pontificalis ecclesiae Ravennatis in the 830s to 840s. According to Agnellus and other sources, the Church of San Vitale was founded by Bishop Ecclesius around 525, …

All-Optical Probes Of Particle-Like Charge Migration Dynamics, Kyle A. Hamer

LSU Doctoral Dissertations

Particle-like charge migration (CM) is the coherent, back-and-forth motion of a positively-charged electron hole along the backbone of a molecule following a sudden ionization. CM in small molecules generally occurs on an Angstrom (10^-10 m) spatial scale and an attosecond (10^-18 s) timescale. I use time-dependent density-functional theory (TDDFT) to simulate CM modes in organic molecules, and to explore all-optical probes of this attosecond electron dynamics using high-harmonic spectroscopy (HHS). By leveraging my results from previous studies of two-center interferences in carbon dichalcogens, in which I separated the harmonic signal into contributions from individual Kohn-Sham orbitals, I first …

Post-Modeling Adjustments And Delivered Dose Verification Of The 6fff Beam Model Commissioned For The Monaco Treatment Planning System, Grant C. Debevec

LSU Master's Theses

External beam radiation therapy has been shown to be an effective treatment method for tumors and abnormalities of the spine and vertebral region. Treating the spine using a stereotactic body radiation therapy (SBRT) technique can reduce toxicity to the spinal cord. The 6 MV flattening filter free (6FFF) beam model is currently used to plan and calculate dose for SBRT treatment plans, and the treatment plans are delivered using a linear accelerator (LINAC).

The commissioned beam model represents an invariant component of a LINAC. For volumetric modulated arc therapy (VMAT) treatment plans, the multileaf collimator (MLC) positions are changing throughout …

Gut Microbial Dysbiosis Differs In Two Distinct Cachectic Tumor-Bearing Models Consuming The Same Diet, Lauri O. Byerley, Brittany Lorenzen, Hsiao Man Chang, William G. Hartman, Michael J. Keenan, Ryan Page, Meng Luo, Scot E. Dowd, Christopher M. Taylor

Faculty Publications

The impact of cancer cachexia on the colonic microbiota is poorly characterized. This study assessed the effect of two cachectic-producing tumor types on the gut microbiota to determine if a similar dysbiosis could be found. In addition, it was determined if a diet containing an immunonutrient-rich food (walnuts) known to promote the growth of probiotic bacteria in the colon could alter the dysbiosis and slow cachexia. Male Fisher 344 rats were randomly assigned to a semi-purified diet with or without walnuts. Then, within each diet group, rats were further assigned randomly to a treatment group: tumor-bearing ad libitum fed (TB), …

Improved Tensor Current Limit From B 8 Β Decay Including New Recoil-Order Calculations, B. Longfellow, A. T. Gallant, G. H. Sargsyan, M. T. Burkey, T. Y. Hirsh, G. Savard, N. D. Scielzo, L. Varriano, M. Brodeur, D. P. Burdette, J. A. Clark, D. Lascar, K. D. Launey, P. Mueller, D. Ray, K. S. Sharma, A. A. Valverde, G. L. Wilson, X. L. Yan

Faculty Publications

A precision measurement of the β+ decay of B8 was performed using the Beta-decay Paul Trap to determine the β-ν angular correlation coefficient aβν. The experimental results were combined with new ab initio symmetry-adapted no-core shell-model calculations to yield the second-most precise measurement from Gamow-Teller decays, aβν=-0.3345±0.0019stat±0.0021syst. This value agrees with the standard model value of -1/3 and improves uncertainties in B8 by nearly a factor of 2. By combining results from B8 and Li8, a tight limit on tensor current coupling to right-handed neutrinos was obtained. A recent global evaluation of all other precision β decay studies suggested a …

Phonic Faces As An Intervention To Improve Decoding Skills Of Children With Persistantly Poor Decoding Abilities, Kayla Therese Martin

LSU Master's Theses

Background: Orthographic rules, phonological awareness, and the ability to process morphemes and phonemes from speech and language begins with verbal speech and the child unknowingly recognizes words from his or her environment as early as the senses can process their surroundings. Some children have difficulty integrating these processes to learn how to read. As Ehri (1979) mentions the importance of establishing mental processes, such as amalgamation and phonological recoding, are essential as a basis for establishing reading fundamentals. Decoding occurs through a complex integration of phonological and orthographic knowledge (Ehri 1992). Early readers typically have well-established amalgams for spoken words …

A Study Of Selected Vocal Works By Shande Ding: The Mysterious Sound Of Flute And Poems On Western Yunnan, Chuyan Luo

LSU Doctoral Dissertations

This study aims to delve into and interpret “The Mysterious Sound of Flute” and “Poems on Western Yunnan” from a singer’s perspective while also providing guidance and recommendations for other performers. The research encompasses the history of Chinese art songs, a biography of Shande Ding, and an introduction to his compositional style. A comprehensive examination of each song includes background information, song analysis, translation, a Chinese lyric diction guide, and performance suggestions.

Art songs constitute a significant genre in music composition, and Chinese art songs have yielded numerous outstanding composers and captivating works over the years. Among these composers, Shande …

Mind The Time: A Synthesis Of Pedagogical Approaches For Improving Rhythm And Meter For Instrumentalists As Applied To Bassoon, Annalea Milligan

LSU Doctoral Dissertations

Rhythm is imperative for the performing musician. This project aims to provide bassoonists with a resource for a rhythmic or metric-focused approach to their applied study. Pedagogical resources for improving rhythm in music through the lens of four categories are identified: experiential, pattern and phrasing, mapping, and repetition. Exercises created from a synthesis of each pedagogical approach demonstrate possible application to bassoon literature by exploring the ways in which an intentional awareness of rhythm can improve technical playing and build practice and performance confidence. By emphasizing the importance of rhythm, its components, and the various approaches to teaching and understanding …

Spatial Behavior Of Hospital Visits By Hand, Foot, And Mouth Disease Patients In Nanchang, China, Zeliu Zheng

LSU Doctoral Dissertations

Hand foot mouth disease (HFMD) is one of the widespread transmissible diseases that target preschool children, especially in urban regions in East Asia. Understanding the travel patterns of the HFMD patients helps us understand how the spatial behaviors of patients vary across space and what are the underlying forces. It is essential for understanding the healthcare market and planning for resource allocation. Foremost, health behavior and outcome change significantly across geographic regions of various urbanicities (i.e., degrees of urbanization) due to the uneven distribution of healthcare resource. In addition, health studies in the U.S. often use hospital service areas (HSAs) …

Estimating Crustal Thickness In Northwest Louisiana Using The Receiver Function Method, Delton Samuel

LSU Master's Theses

I aim to constrain the crustal thickness of the Sabine Block in the Sabine Uplift region of northwest Louisiana, using the frequency domain receiver function deconvolution technique followed by H-κ stacking. The passive margin on the southern edge of the North American continent experienced an active tectonic history, including the spreading events that led to the formation of the Gulf of Mexico. A previous study proposed the Sabine Block is a residual fragment of Proterozoic orogenic origin; however, its full extent and geometry are up for debate. It is now overlain by thick sedimentary sequences ranging from ~4-6 km deposited …

Investigating The Role Of Fluid Shear Stress During Metastasis On Enhanced Breast Cancer Extravasation, Alejandra M. Ham

LSU Master's Theses

In 2022, ~288,000 American women were diagnosed with metastatic breast cancer which was the leading cause of patient mortality with ~43,000 American women succumbing to the disease. Women can be diagnosed with four different molecular subtypes of breast cancer: luminal A, luminal B, human epithelial growth receptor type 2 enriched (HER2+), and triple-negative breast cancer (TNBC). TNBC accounts for ~12% of all breast cancers, yet it has the worst outcomes. TNBC is highly invasive, with ~46% of TNBC patients developing metastatic disease. A further understanding of metastatic TNBC is needed to provide a greater understanding of how to treat this …

A Novel Goat Model To Characterize Male Fertility Following Paternal Cannabidiol Exposure, Ashlyn N. Brewer

LSU Master's Theses

Despite the increasing use of cannabidiol, both for medical and social purposes, the effect of cannabidiol on male fertility is poorly understood. Previous studies have been carried out in rodent models, but a large animal model does not exist at this time. This experiment proposes chronic cannabidiol (CBD) exposure using a goat model to understand the impact CBD has on male reproductive performance. The purpose of this project is to determine if daily exposure to CBD in male goats would impact reproductive parameters such as sperm quality and testosterone levels.

Two studies were conducted to determine the effects of CBD …

The Modular Generalized Springer Correspondence For The Symplectic Group, Joseph Dorta

LSU Doctoral Dissertations

The Modular Generalized Springer Correspondence (MGSC), as developed by Achar, Juteau, Henderson, and Riche, stands as a significant extension of the early groundwork laid by Lusztig's Springer Correspondence in characteristic zero which provided crucial insights into the representation theory of finite groups of Lie type. Building upon Lusztig's work, a generalized version of the Springer Correspondence was later formulated to encompass broader contexts.

In the realm of modular representation theory, Juteau's efforts gave rise to the Modular Springer Correspondence, offering a framework to explore the interplay between algebraic geometry and representation theory in positive characteristic. Achar, Juteau, Henderson, and Riche …

Round Ii: Exploring The Experiences Of Black, First-Generation Graduate And Professional Students At Historically Black Colleges And Universities (Hbcus), Derrick D. Lathan

LSU Doctoral Dissertations

This phenomenological study explores the experiences of Black, first-generation (first-gen) students pursuing advanced degrees at historically Black colleges and universities (HBCUs), following the COVID-19 pandemic and racial justice movements like Black Lives Matter. Additionally, this study examines the present-day motivations to pursue advanced degrees, particularly the benefits of doing so at an HBCU. The main research question guiding this study is: What are the experiences of Black, first-gen graduate and professional students at historically Black colleges and universities (HBCUs)? The sub-questions are:

1. How do Black, first-gen graduate and professional students describe being a first-gen student?
2. What barriers and supports impact …

Thermal Frontal Polymerization – Applications In Coatings And Composites, Maria Martinez

LSU Doctoral Dissertations

Thermal frontal polymerization has long been used as a method to cure composites and coatings. However, this is the first time these applications have been used without the use of a catalyst, for the case of composites and coatings.

Chapter 2 discusses how to optimize cure-on-demand, thin layer coatings, using frontal polymerization. Previously, for the use of curing thin layer coating using thermal FP, it was known to just make the formulation viscous enough, as this would prevent premature quenching caused by heat loss. It was discovered that for a given layer thickness, a minimum viscosity and initiator concentration were …

Starting Small Or Big: An Artificial Language Paradigm, Rachel Evans

LSU Master's Theses

Previous research on language acquisition has raised two competing hypotheses: Starting Small and Starting Big. Starting Small states that limitations (small working memory capacity, simple structure, short string length, etc.) are beneficial for language learning, which explains why children are able to acquire language more easily than adults. Starting Big proposes the opposite, that input of chunks of language rather than individual units creates a stronger and more fluid understanding of grammatical relations between words. The current study aimed to investigate these theories in the context of an artificial language paradigm using a forced-choice task, a production task, a working …

Effects Of Iconic Gestures On Word Pair Learning In Autistic And Non-Autistic Adults, Caprielle G. Priola

LSU Master's Theses

Previous studies have demonstrated that simultaneous speech and iconic gestures enhance learning and memory for listeners. Additionally, metacognitive awareness, which can be measured through judgements of learning (JOLs), has also been shown to impact learning and memory. However, it has not been established that these benefits apply to all learners. Existing studies on gesture processing and metacognitive abilities in autistic adults yield mixed findings. The present study aims to investigate the impact of co-speech iconic gestures on word pair recall and perceived learning (JOLs) in autistic and non-autistic adults.

Forty non-autistic adults and 40 autistic adults participated in an online …

Geospatial Analysis Of Historical Tropical Cyclone Intensity And Rainfall In Georgia, United States, Reilly T. Corkran

LSU Master's Theses

Tropical cyclones, characterized by their high wind speeds and heavy rainfall, cause widespread devastation, affecting millions of people and leading to economic losses worldwide. Tropical cyclone-specific research in Georgia is scarce, likely due to the coast’s minimal geographical extent and the relative infrequency of direct landfalls. Research on Georgia tropical cyclones does not account for storms that make landfall in Florida and continue north, northeast, or northwest. In 2018, Hurricane Michael generated $4.7 billion in property, agriculture, and forestry damages across southwest Georgia as a Category 3 hurricane. With an increasing population, property development, and agriculture sector sensitive to tropical …

Different Error Patterns Of /L/ In Children And Speech-Language Pathologists' Perception And Treatment, Grace E. Lemoine

LSU Master's Theses

Children often simplify target speech sounds using phonological processes, or common developmental error patterns. However, some children produce less common error patterns that differ from common errors. In the current study, less common errors involving /l/ sounds were studied as the phoneme /l/ is a sound that is subject to frequent misarticulations in young children and perceptual confusion among listeners. The current study focused on less common errors because studies have suggested that atypical errors can indicate weak phonological representations and poor phonological awareness skills, which can have long-term effects on children’s literacy skills. Therefore, the aim of the current …

Decoding Affective Information From Neuronal Populations In The Human Hippocampus, Alexander N. Lawriw

LSU Master's Theses

The hippocampus is understood to play a key role in the formation of episodic memories. Prominent theories suggest this is made possible through use of sparse encoding schemes, in which a small number of neurons encode each episodic event using a distinct pattern of neuronal activity. However, more recent computational models suggest that the hippocampus may also be capable of representing semantic structure, a notion previously thought to be exclusive to the neocortex. In our previous line of work, we trained multivariate classifiers to predict the semantic content, specifically affect, of computer-generated faces given spiking data taken from individual neurons …

A Study Of Select Arias From Three Obscure Operas By Antonio Vivaldi: ‘Ottone In Villa,’ ‘Arsilda, Regina Di Ponto,’ And ‘Il Farnace’, Qinan Cai

LSU Doctoral Dissertations

This paper provides an analysis of select compositional tools found in chosen arias from Antonio Vivaldi’s lesser-known operas, Ottone in Villa RV 729, Arsilda, Regina di Ponto RV 700, and Farnace RV 711. It aims to illuminate Vivaldi’s exploration of human emotions and relationships through his music. The research focuses on select arias from each opera, emphasizing Vivaldi’s compositional style, use of sequential patterns, development of harmonic shifts in the music, and the inclusion of the Lombardic rhythm. In addition, commentary is included regarding the application of modal principles, and rhythmic speech patterns. The study also offers historical context and …

Sequencing Orchestral Repertoire For Collegiate Orchestras: Addressing The Educational Needs Of Students In Various Stages Of Development, Cheuk Nok Francis Ku

LSU Doctoral Dissertations

Sequencing is a fundamental aspect of music education, not only in individual instrumental teaching but also in large-ensemble instruction. Collegiate orchestras, like other educational ensembles, experience turnover of students each academic year, and face unique challenges in repertoire selection due to the diverse skill levels and experience of their members. This document presents a case study of the LSU Symphony Orchestra program spanning from 2021 to 2024, and complements a performance featuring works by Amy Beach, Ludwig van Beethoven, Joseph Haydn, and José Pablo Moncayo. The document also delved into the study of performance practice during the Classical period and …

Improving Implicit Communication In Remote Collaboration Through Augmented Reality And Digital Twins, Nicholas Levergne

LSU Master's Theses

Large scale digital twinning projects are beginning to emerge across the tech industry. Within these projects is a desire to integrate augmented reality capabilities into industrial workflows. However, research on augmented reality technology for remote collaboration lacks ecologically valid studies of real world scenarios. Additionally, prior remote collaboration literature is focused on white-collar applications instead of blue-collar field work. Prior AR collaboration software is similarly limited, with most software allowing mixed camera views and annotation that requires participants to be stationary. This thesis introduces SpectAR, an augmented reality and desktop remote collaboration software suite developed in Unreal Engine 5.1.1. SpectAR …

Speech And Language Errors In An 8-Year-Old Spanish-English Bilingual Speaker: A Case Study, Alaniss Heredia

LSU Master's Theses

Despite the growing population of Spanish-English bilingual speakers with developmental language disorders and speech sound disorders (SSD) in the United States, there is limited research on assessment for this population. Research suggests that the linguistic environment in which the Spanish-English bilingual speakers are brought up should be considered when assessing and treating this population since the Spanish-English bilingual population is diverse. One result of such environments is differences in degrees of language exposure. For example, a child can be exposed to two languages but have more exposure in one than the other. This might lead to better proficiency in one …

Effects Of Music Instruction For 3-4-Year-Old Children On Cognitive Development And Spatial Skills, Veronica Perez Espinosa

LSU Master's Theses

The impact of music instruction on child cognitive development has been examined by researchers in many contexts, but not as often in very young children. The purpose of the present study was to investigate the effects of music instruction on the spatial and cognitive skills of preschool children ages 3-4. Participants in the study were 68 three- to four-year-old students who received weekly music instruction at a private school in South Louisiana. Of the 68 participants, and using a quasi-experimental design, 30 students in three intact classes were randomly assigned to receive a movement song treatment and the other 38 …

Ceratocystis Fimbriata Alters Root System Architecture And Causes Symptom Development Only In Detached Storage Roots In Bayou Belle And Beauregard Sweet Potato, Arthur Q. Villordon, Catherine D. Derobertis, Christopher A. Clark

Faculty Publications

Little is known about how the sweet potato (Ipomoea batatas) root system responds to Ceratocystis fimbriata in the growth substrate. Understanding whether the fungus affects the root system before harvest of storage roots (SR) could guide timing of management efforts. Cuttings of cultivars Bayou Belle and Beauregard, both previously considered susceptible to black rot, were in unamended or infested sand. At the onset of SR formation, effects on first- and second-order lateral root (LR) length and number among and within treatments, cultivars and replicate experiments were recorded. First-order LR length in inoculated Bayou Belle plants was 31% greater than in …

Illumina 16s Rrna Gene Sequencing Dataset Of Bacterial Communities Of Soil Associated With Ironwood Trees (Casuarina Equisetifolia) In Guam, Tao Jin, Robert L. Schlub, Claudia Husseneder

Faculty Publications

Ironwood trees, which are of great importance for the economy and environment of tropical areas, were first discovered to suffer from a slow progressive dieback in Guam in 2002, later referred to as ironwood tree decline (IWTD). A variety of biotic factors have been shown to be associated with IWTD, including putative bacterial pathogens Ralstonia solanacearum and Klebsiella species (K. variicola and K. oxytoca), the fungus Ganoderma australe, and termites. Due to the soilborne nature of these pathogens, soil microbiomes have been suggested to be a significant factor influencing tree health. In this project, we sequenced the microbiome in the …

Callous–Unemotional Traits And Emotion Perception Accuracy And Bias In Youths, Enrica Ciucci, Andrea Baroncelli, Carolina Facci, Stefania Righi, Paul J. Frick

Faculty Publications

This study investigated the associations among conduct problems, callous–unemotional (CU) traits, and indices of emotion recognition accuracy and emotion recognition bias obtained from human faces. Impairments in emotion recognition were considered within broader, impaired emotional and social functioning. The sample consisted of 293 middle-school students (51.19% girls; M age = 12.97 years, SD = 0.88 years). In general, CU traits were associated with less accuracy in recognizing emotions, especially fearful and angry faces, and such deficits in emotional recognition were not associated with conduct problems independent of CU traits. These results support the importance of studying potential deficits in the …