LOUIS University of Alabama in Huntsville
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Existence and stability analysis for non-autonomous systems of differential equations in multi-dimensional time
Full text linkThis dissertation studies the existence and stability of solutions for a class of non-autonomous systems of differential equations in multi-dimensional time, within the framework of Banach space. Focusing on both hyperbolic and parabolic cases, it presents a comprehensive range of results on existence and stability over finite and infinite time intervals. By leveraging the theory of evolution families, this work uncovers the conditions under which these systems have solutions and provides an in-depth analysis of how these solutions evolve, offering fresh perspectives on their dynamic behavior over time
Investigation into floral structure traits in Miscanthus
No full textAwns and callus hairs are significant dispersal traits of Miscanthus - understanding them will be essential in domesticating this crop. Due to their small size, these structures can be challenging to phenotype. To aid this, a method has been developed for automated length measurement via computational image analysis in Python. Lengths for both structures have been collected and processed for all plants in both the Mississippi State University and Alabama A&M University research fields. The measurements from both sites were compiled and mapped against the Miscanthus genome to create multiple Quantitative Trait Loci (QTL) maps of inflorescence trait-affecting genes. Chromosomes 3 and 6 consistently showed an effect on awns, while chromosome 19 showed an effect on callus hair length at the Alabama A&M research site and in the combined data set of both locations but did not show an effect in the Mississippi State University data set
Attention deficit hyperactivity disorder and metacognitive awareness of learning
Full text linkThe present study examined knowledge updating abilities in individuals with and without ADHD when forced to metacognitively evaluate the effectiveness of different study strategies. Participants with and without ADHD were randomly assigned to either a spontaneous or a forced knowledge updating condition, with those in the latter condition being asked to keep track of encoding strategy-recall outcome results, but no additional instructions for those in the spontaneous condition. I expected that healthy control participants would show greater knowledge updating abilities than those with ADHD, the participants in the forced knowledge updating condition would show greater knowledge updating abilities than participants in the spontaneous updating condition, and healthy controls in the forced knowledge updating condition would show greater knowledge updating abilities than the ADHD individuals in the same condition. Knowledge updating of study strategy effectiveness was found where ADHD individuals in the forced knowledge updating condition showed greater knowledge updating than the control participants. The forced condition potentially promoted metacognitive abilities in ADHD participants. These results combine to suggest that ADHD individuals can show knowledge updating of study strategies if their metacognitive abilities are promoted in some way. Future research should investigate whether these results extend to a setting more similar to a college class
Analysis of interbacterial competition amongst lactobacilli isolated from the human urinary tract
No full textThe rise of antibiotic-resistant urinary tract infections (UTIs) has led to an increased interest in alternative treatment and prevention methods without antibiotics. Female urinary bladders host microbial communities that often contain lactobacilli bacteria. Many lactobacilli are known for their ability to kill urinary pathogens in vitro and proposed as a probiotic treatment for UTIs. It is not known whether urinary lactobacilli compete with one another and what is the potential impact of introducing probiotic lactobacilli. Well-diffusion inhibition assays were used to detect competition amongst several urinary lactobacilli species. My results identified one species-specific and cell-contact dependent inhibition of Lactobacillus delbrueckii growth by Lacticaseibacillus rhamnosus. Near-complete whole genomes of eleven new urinary lactobacilli strains of five species were established using hybrid de novo assembly and analyzed for homology and genetic markers such as plasmids, prophages, bacteriocin and antibiotic resistance genes, that are possibly involved in the interspecies competition
Bloomer
No full textBloomer is a creative project crafted from years of reading plays and researching work from contemporary women and feminist playwrights who inspired the author to explore various modes of playwrighting. This project allowed the author to explore the life of Amelia Bloomer, an influential individual from the women’s rights movement, and the significance of friendship and community, particularly in situations of social injustice. While this work contains historical facts from history about the lives of Amelia Bloomer and her friends, the piece still stands as a historical adaptation that examines themes of protest literature, women’s agency in a male- dominated society, suffragette history, and the inherent queerness of female friendships. Ultimately, the play is a result of research and inspiration from playwrights contributing to the canon of feminist dramatic literature, which allowed the author to incorporate her passion for women’s gender and sexuality studies in the form of a creative project
Average heat flux measurements in an additively manufactured rotating detonation rocket engine calorimeter
Full text linkRotating detonation rocket engines (RDREs) offer benefits over traditional deflagrative engines, including increased engine performance, compact combustion and negligible detrimental thermoacoustic instabilities due to mode-locking. Realizing the benefits of a detonation-based propulsion system will be accompanied by increased thermal loads due to a combination of heat release at elevated pressure and temperature, as well as compact heat release due to detonation. Managing these heat loads necessitates the development of thermal management strategies. As a first step towards establishing the requirements for detonation-based engine thermal management strategies, this work develops an additively manufactured (AM) water-based, axially resolved calorimeter for integration in an existing 76.8 mm outer diameter (OD) RDRE to measure average chamber heat flux. In particular, the calorimetry outer body provides average heat flux data via circumferential channels at nine axial stations to axially resolve the heat flux distribution on the chamber outer wall. The average heat flux is found to be 6.6 − 16.3 MW/m2 for a straight annulus and 11.4−20.5 MW/m2 for a constricted annular configuration which exhibited maximum heat flux at the throat. By quantifying the axial distribution of heat flux, this work seeks to support the development of thermal management systems for long duration firing of detonation-based devices
Nonlinear vortical electron acceleration in magnetic reconnection and its application to solar flares
Full text linkThe origin of solar energetic electrons has been a long-standing problem, namely the production of a huge number of energetic electrons with power-law energy spectra within a sufficiently short time. Using particle-in-cell (PIC) magnetic reconnection (MR) simulations based on a new vortical electron acceleration model proposed by Che and Zank (CZ) [21], I first investigated the scaling of the PIC MR simulations to the observational scales of solar flares. The CZ model reproduced the sharp two-stage transition observed in soft-hard-harder electron energy spectra, implying that the electron acceleration timescale must be a small fraction of the solar flare duration. Then I investigated the impact of the magnetic guide field on the electron acceleration. I discovered that while the CZ model works well for smaller guide field MR, a new Alfv ́enic-like Fermi electron acceleration mechanism emerges for strong guide field MR, producing a harder power-law energy spectrum
