Electronic Thesis or Dissertation

Since 2005 corporate managers must discuss their firm’s significant risk factors that may materially and unfavorably affect corporate outcomes in the Item 1A Risk Factor Disclosure (RFD) section of their 10-K filings. However, there is limited research on whether firms change the sentiment of their mandatory disclosures after a significant economic event. I use bankruptcy announcements as a unique setting in this study to assess non-announcing firms’ responses to these events as a bankruptcy announcement generates significant concern to non-announcing industry peer firms. I explore whether industry peers change four measures of sentiment (i.e., length, negative tone, specificity, forward-looking statements) of Item 1A RFDs after a rival firm’s bankruptcy filing. Using textual analysis methodology, I find that industry peer firms have shorter, less negative, and less forward-looking RFDs after another firm’s bankruptcy announcement. These results imply that industry peers are likely to adjust their tone of mandatory filings (i.e., Item 1A RFDs) in response to a rival firm’s bankruptcy announcement. I further provide evidence that firms do not use separate subsections to disclose their firm- and industry-specific risks within their Item 1A RFDs. Lastly, the lengths of financial, litigation, other-idiosyncratic, and other-systematic topic disclosures significantly decrease for non-announcing industry peers while the length of tax relevant risk topic does not significantly change after a bankruptcy filing. This study adds to mandatory research by identifying the spillover effect of a bankruptcy announcement on Item 1A RFDs. This research also contributes to accounting literature by providing evidence that non-announcing industry peers significantly adjust the sentiment of their risk factor information. Market participants including investors, shareholders, and financial analysts can improve investment decision accuracy by analyzing the industry peers’ risk factor information.

The communication in the nervous system is a pharmacological balance between excitatory and inhibitory signals, and seizure behavior is one of the most common manifestations of when an imbalance occurs. Environmental toxins can cause significant disruption of excitation-inhibition balance, but while some toxins, like nerve agents, have known targets and require novel antidotes, some have unknown neurobiological mechanisms and require exploration. Of particular concern, there is little knowledge on how herbicides may affect neurological signaling. Glyphosate, the world’s most popular herbicide, was found to be in 80% of people’s urine, and since it is so prevalent, it is critical to understand its impact on both excitatory and inhibitory signaling. We used an electroshock assay developed for C. elegans to uncover evidence that glyphosate, and the commercial formula Roundup, disrupted the excitation-inhibition balance by blocking GABA-A receptors. This presented a novel hypothesis of an inhibitory neurobiological target for glyphosate. As glutamate is the major excitatory neurotransmitter in the human central nervous system, an electrophysiology assay using Drosophila was used and found that Roundup, but not glyphosate, reduced synaptic viability. This result directs attention to the undisclosed adjuvant component which may have a significant effect on synaptic transmission, though the exact mechanism requires further investigation.

Mainstream vehicles sold today are equipped with the Advanced Driver Assistance System (ADAS) known as Adaptive Cruise Control (ACC). ACC automatically adjusts speeds and maintains a safe following distance with the preceding vehicle. This enables partial automation by automating longitudinal car-following. Despite the ever-increasing market penetration, ACC-equipped vehicles will likely operate in a mixed environment with other human-driven vehicles first. However, the traffic flow impact of human driver behavior when following ACC-equipped vehicles is largely unknown, and it is uncertain whether this deserves special consideration when modeling human driver behavior near ACC enabled vehicles. This study conducted a preliminary real-world experiment on a freeway (a portion of Interstate 95) and an urban arterial (a portion of state route A1A) to investigate the human driver behavior with and without the presence of vehicles in ACC mode as the leaders. This unbiased experiment was conducted in naturalistic traffic conditions. Results from the field experiments demonstrate that in a mixed environment with ACC-equipped vehicles as leaders, the human driven vehicles as the follower adopt similar headway, spacing, and acceleration on both freeway and arterial, with no statistically significant difference. The only exception is when traveling at speeds below 15 mph on urban arterials, where human drivers adopt significantly larger spacing while following ACC-enabled vehicles. We expect that findings from these field experiments will provide important initial insights to future research on human driver car following models in a mixed traffic environment and dedicated lanes for automated vehicles.

Fibropapillomatosis (FP) is a tumor disease that has reached panzootic proportions in green turtles (Chelonia mydas). FP is associated with chelonid alphaherpesvirus 5, although the etiology of FP is likely multifactorial, since high FP prevalence is often observed in degraded habitats. However, specific environmental cofactors for tumor development remain unknown. To explore this, I collated statewide green turtle stranding data from 2000–2020 to evaluate spatiotemporal trends of FP in Florida, and co-analyzed these data alongside patterns of river flow, chlorophyll-a (Chla), sea surface temperature (SST), El Niño (ENSO), and red tide (HAB). I found that FP was stable during 2000–2020. HAB (positively) and SST (negatively) correlated with statewide FP prevalence, as well as several interactions between various factors. These results suggest that SST and HABs may act as cofactors in the development of FP, and future work should be equally interdisciplinary in their investigation of this multifactorial disease

Working memory (WM) enables the flexible representation of information over short intervals. It is established that WM performance can be enhanced by a retrospective cue presented during storage, yet the neural mechanisms responsible for this benefit are unclear. Here, we tested several explanations for retrospective cue benefits by quantifying changes in spatial WM representations reconstructed from alpha-band (8 - 12 Hz) EEG activity recorded from human participants before and after the presentation of a retrospective cue. This allowed us to track cue-related changes in WM representations with high temporal resolution. Our findings suggest that retrospective cues engage several different mechanisms such as recovery of information previously decreased to baseline after being cued as relevant and protecting the cued item from temporal decay to mitigate information loss during WM storage. Our EEG findings suggest that participants can supplement active memory traces with information from other memory stores. We next sought to better understand these additional store(s) by asking whether they are subject to the same temporal degradation seen in active memory representations during storage. We observed a significant increase in the quality of location representations following a retrocue, but the magnitude of this benefit was linearly and inversely related to the timing of the retrocue such that later cues yielded smaller increases.

In this thesis, feasibility of a concept for launch and recovery of the Remus AUV from WAM-V USV is investigated. A modular recovery system which can be added to the WAM-V payload tray was designed, and based on a review of previous literature a CONOPS was developed for the launch and recovery process. The first phase of the CONOPS, which pertains to the position of the REMUS initially on the free surface prior to sling engagement is simulated using ANSYS AQWA. Preprocessing for the simulation involved simplification of the model in ANSYS SpaceClaim to achieve a proper mesh as well as theoretical calculations of the input parameters for wave environment and point masses etc. The simulation was evaluated by taking into consideration two wave environment scenarios: beam sea’s (-90 degrees) and head seas (0 degrees). The wave environment was based on a linear frequency range for the waves which considered wavelengths that correspond to half and double the length of the WAM-V 16’. The significance of the simulation is characterized through identifying the ideal direction and wave frequency range for recovery based on the RAOs of the two vehicles.

This creative thesis is a collection of poems and lyric forms that explore queer identity and difference through the fraught navigation of heteronormative spaces and institutions such as the American school system, the Catholic Church, and marriage. Included are letters-as-poems, journal fragments, and extended lyrical sequences that serve to highlight the significance of community and chosen family to queer identity. When they aren’t addressed to an imagined recipient, they are dedicated to or in conversation with friends, family, lovers, strangers, past selves, and other writers. Although the three sections (LETTERS, FIRE, and HEARTH) that demarcate this work chart a thematic chronology that organizes stages of a queer life, memory isn’t cleanly linear. Poems pour into and echo each other, signifying embodied history in the present and the past’s bearings on queer (re)imaginings of the future.

In 1890 The Picture of Dorian Gray was published in Lippincott’s Magazine, and the fate of late-nineteenth century Victorian Britain was forever changed. While over a century's worth of studies have been conducted on aestheticism, the novel’s moral story, and whether or not Dorian Gray and Oscar Wilde are both gay figures, this thesis examines the possible intentions behind the writing of Wilde’s novel. Wilde lived during the time of the 1885 Labouchere Amendment, –under which he himself would be prosecuted for “gross indecency”– making the novel's contents risky. Alongside this amendment, there were already existing instances of criminalized homosexuality such as the Cleveland Street Scandal, making the novel’s publication all the more dangerous for Wilde. After publication, Wilde received numerous negative reviews attacking his novel and himself; even today, reviewers and critics have not fully understood why Wilde produced a novel with such an apparent and perilous homoerotic theme.

Rapid and efficient vascularization is still a considerable challenge of a tissue engineered β-tricalcium phosphate (β-TCP) scaffold. To overcome this challenge, branched channels were created in the porous scaffold to stimulate the instant flow of blood supply. The branched channeled porous β-TCP scaffold was fabricated using 3D printing and template-casting method. Human bone mesenchymal stem cells (hBMSC) and human umbilical vein endothelial cells (HUVEC) were seeded in the scaffolds and characterized through double-stranded DNA (dsDNA) assay, alkaline phosphatase (ALP) assay and cell migration. Scaffolds were then implanted in the subcutaneous pockets in mice. Hematoxylin and eosin staining and Immunohistochemical staining on vascularization, bone-related markers were carried out. Results showed that branched channels significantly promoted HUVECs’ infiltration, migration, proliferation, and angiogenesis and also promote the proliferation and osteogenesis differentiation of hBMSCs. Scaffolds did not show significant pro-inflammatory effects. In vivo results showed that in the early stage after implantation, cells significantly migrated into branched channeled scaffolds compared to non-channeled and straight channeled scaffolds. More and matured blood vessels formed in the branched channeled scaffolds compared to in non-channeled and straight channeled scaffolds. Besides promoting vascularization, the branched channels also stimulated the infiltration of bone-related cells into the scaffolds. These results suggested that the geometric design of branched channels in the porous β-TCP scaffold promoted rapid vascularization and potentially stimulated bone cell recruitment. To further enhance the function of the scaffold to promote the MSCs differentiation, MnO2 hollow and solid nanoparticles were doped into the scaffold with different concentrations.

Self-Gardening seeks to explore the oftentime selfish rationale behind seemingly selfless decisions. In dissecting my motivation, I found insecurity. I don't garden for the joy of it, I garden to feel valuable. Beneath my desire for children, lives the terrifying hesitation of putting more bad into the world. While this thesis does look to shine a light on uncomfortability and insecurity, it has no interest in poking or prodding them. Acknowledgement and awareness are enough.