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Empirical Bayes Estimators And Borel-Tanner Distribution, Celestina Ruby Soltero

Theses and Dissertations

The motivation for this paper stems from the role Borel-Tanner (BT) distribution has as the distribution of the total outbreak number in epidemics modeled by branching processes. We briefly review Borel-Tanner distribution and its applications. In Chapter II we outline the Bayes decision problem, a construction for an Empirical Bayes (EB) estimator proposed by Liang [9] and discuss risk analysis. In Chapter III, the importance of randomization addressed and a classical construction of a monotonized EB estimator proposed by Houwalingen [14] is outlined. Lastly in Chapter IV we use R software to perform a Monte Carlo simulation and conduct a …

Temperature Influence On Insecticide Resistance In Aedes Aegypti And Aedes Albopictus Mosquitoes From South Texas, Wendy Soledad Salinas

Theses and Dissertations

Aedes aegypti and Aedes albopictus are vectors for several emerging arboviruses including Zika, chikungunya and dengue. Both mosquitoes are found along the Rio Grande River in South Texas, along the border between Mexico and the United States of America. These mosquito species typically reside near human settlements. A preventative measure public health official use to help halt the spread of diseases is by controlling vector population with the use of insecticides, but as temperature vary, and with the constant exposure to commonly used insecticides, mosquitoes from South Texas may be developing a resistance to the insecticides. Resistance to insecticides may …

Evaluating Responses Of Benthic Macrofauna To Artificial Reef Presence In The Gulf Of Mexico, Douglas Faircloth

Theses and Dissertations

Artificial reef research has long concerned itself with the interactions of fishes and has tended to favor commercially valuable species. Because of this, a larger yet less known group that heavily benefits fishes have been overlooked; benthic macrofauna. Benthic macrofauna are marine invertebrates that live below the sediment-water interface and play many roles in the ecosystem. Macrofauna are important prey items, ecosystem engineers, and bioindicators, as well as being ubiquitous in the marine environment. Since macrofauna have been largely ignored in this field, not much is known regarding their interaction with the placement of artificial reefs. To try and fill …

Development And Analysis Of 3d-Printed Synthetic Vocal Fold Models, Ryan Gregory Romero

Theses and Dissertations

Vocal fold models are valuable for studying voice production. They provide an alternative method of studying the mechanics of the voice that does not require in vivo experimentation or the use of excised human or animal tissue. In this thesis, a new method of creating vocal fold models through additive manufacturing is described. The purpose of this research was to reduce model fabrication time, to decrease the number of model failures during manufacturing, and to lay the foundation for creating models with more lifelike geometric and material properties. This research was conducted in four stages. First, a suitable silicone additive …

Improving And Modeling Bacteria Recovery In Hollow Disk System, Clifton Anderson

Theses and Dissertations

Identifying antibiotic resistance in blood infections requires separating bacteria from whole blood. A hollow spinning disk rapidly removes suspended red blood cells by leveraging hydrodynamic differences between bacteria and whole blood components in a centrifugal field. Once the red cells are removed, the supernatant plasma which contains bacteria is collected for downstream antibiotic testing. This work improves upon previous work by modifying the disk design to maximize fractional plasma recovery and minimize fractional red cell recovery. V-shaped channels induce plasma flow and increase fractional plasma recovery. Additionally, diluting a blood sample spiked with bacteria prior to spinning it increased the …

Comparison Of Eight Remnant Tamaulipan Biotic Province Plant Communities In The Lower Rio Grande Valley Using Multivariate Analyses [Comparación De Ocho Comunidades Vegetales Remanentes De La Provincia Biótica Tamaulipeca El Valle Del Río Grande Usando Análisis Multivariada], Raziel I. Flores

Theses and Dissertations

The Tamaulipan Biotic Province falls within a biogeographic ecotone between temperate North America, the neotropics and the Chihuahuan Desert, and has consequently been defined as “Tamaulipan brushlands.” No quantitative, comparative study has ever been undertaken on the many and varied plant communities that occur in the region. This study compares eight remnant, primary plant communities to test the null hypothesis that the province comprises a single definable vegetation type. Four 50 x 10 m belt-transects were established at each site and woody plants taller than 1 m were recorded to determine species frequency, density, stratification and dominance. Community diversity was …

Developing Multispectral Imaging Techniques To Determine Canopy Coverage And Carbon Storage Of Seagrasses In The Gulf Of Mexico, Ivy Michelle Hinson

Theses and Dissertations

Although seagrass beds provide global ecosystem services, coverage is in rapid decline, with the capacity of seagrasses to sequester carbon of special concern. Current seagrass monitoring methods are labor intensive and may not offer a complete picture of coverage. Remote sensing offers the ability to oversee landscapes but water in coastal environments presents challenges, as the commonly used near-infrared wavelength dissipates in water.

This project aimed to provide reliable methodology to assess seagrass coverage using multispectral imagery taken from an unmanned aerial vehicle and to provide evidence for the link between seagrass coverage and stored belowground carbon for common seagrasses …

So . . . We're Going For A Walk: A Placed-Based Outdoor Art Experiential Learning Experience, Priscilla Anne Stewart

Theses and Dissertations

Schools in the United States often emphasize making children competitive in a global economy while neglecting the importance of developing citizens who are ecologically responsible. Problems of climate change, loss of biodiversity, mass extinctions and degradation of the natural environment, are often ignored. Some researchers have suggested that children lack unstructured play time in nature, have an increased amount of screen time, lack mindfulness, and are insulated from the natural world. Many children rarely have significant experience with nature's wildness. It is common for people to experience a sense of placelessness in the hyper-mobility of present times where "globalizing" agendas …

Development Of A Novel Bioprinting System:Bioprinter, Bioink, Characterizationand Optimization, Chandler Alan Warr

Theses and Dissertations

The use of 3D printing in biological applications is a new field of study given that 3D printing technology has become more available and user friendly. Possible uses include using existing 3D printing polymers to use in extracorporeal or in vitro devices, like Lab-on-a-Chip, and the development of new biologically derived materials to print cell-containing constructs. The latter concept is what is more commonly known as bioprinting. Our research had the goal of developing a bioprinting system including the printer, a bioink, and a feedback system for printing parameter optimization which could be done cheaply and within the reach of …

Electrospun Nanofibers Of Polymer Nanocomposite With Cichorium Intybus Extract And Investigating Their Antioxidant And Antibacterial Activities, Ahmed Emadelddin Mohamed

Theses and Dissertations

Micro-organisms causing diseases have been quickly increasing and spreading vastly in their ability to gain resistance against current antibiotics in the market. This results in an enormous mortality rate. Fortunately, Scientists introduced nanotechnology that can further enhance properties of materials in the nanoscale. This allowed further openings to upgrade natural-based products to become more effective and safer than current synthetic antibiotics. In this study, biodegradable polymer nanocomposite made up of Poly Vinyl alcohol (PVA) with Chitosan (CS) was electro-spun using the electro-spinner embedded with Chicory root herbal extract that can potentially be used for targeting Gastro Intestinal Tract (GIT) diseases. …

Emotion Recognition Using Facial Feature Extraction, Demiyan Smirnov

Theses and Dissertations

Computerized emotion recognition systems can be powerful tools to help solve problems in a wide range of fields including education, healthcare, and marketing. Existing systems use digital images or live video to track facial expressions on a person's face and deduce that person's emotional state. The research presented in this thesis explores combinations of several facial feature extraction techniques with different classifier algorithms. Namely, the feature extraction techniques used in this research were Discrete Cosine/Sine Transforms, Fast Walsh-Hadamard Transform, Principle Component Analysis, and a novel method called XPoint. Features were extracted from both global (using the entire facial image) and …

Functional Porous Polydimethlysiloxane As Piezoresistive And Piezoelectric Materials, Taissa Rose Michel

Theses and Dissertations

In this paper, polydimethylsiloxane (PDMS), carbon nanotubes (CNTs), and zinc oxide (ZnO) were combined to create functionalized piezoresistive and piezoelectric sensors for pressure sensing and energy harvesting. Samples were foamed to show that the increased deformability of the foam sensors makes them suitable for a range of applications including dexterous robotics, tactile sensing, energy harvesting, and biosensing. Uniform dispersion of CNTs was achieved with chloroform as the solvent. Samples were foamed using chemical blowing and scaffolding but granulated sugar at 70% porosity resulted in foamed samples with the most consistent mechanical properties. Samples underwent tensile and compressive testing for their …

An Intersectional Feminist Rhetorical Reframing Of Rhetorics Of Efficiency Within Public Policy: Embodied Knowledge And Usability, Oriana A. Gilson

Theses and Dissertations

This dissertation focuses on public policies that are presented under the pretext that they benefit all members of society but that in fact reserve those privileges for those who conform to reductive policy mandates. Specifically, this project employs an intersectional feminist rhetorical methodology that is committed to identifying and challenging exclusionary rhetorics of efficiency and propelling the agentive power of those whose embodied realities places them outside of the normative user-group imagined by, and constructed through, a specific policy. This dissertation begins with a synthesis of scholarship that is key to the theorization and application of an intersectional feminist rhetorical, …

Need Fulfillment And Happiness In Botswana, Carolyn Moe

Theses and Dissertations

Happiness has been an important aspect of people’s lives spanning centuries and continents; as such, it is a widely researched area. A current prominent theory in happiness research is Needs Theory which has the premise that there are universal human needs and having these needs met would lead to a person’s happiness. Most often, the needs referenced are those presented by Abraham Maslow including needs of physiology, safety and security, love and belonging, esteem, knowing and understanding, aesthetics, self-actualization and transcendence. However, some studies have found that there are individuals who do not fit this theory either through having their …

An Unexpected Companion: Hope And Its Role In Dystopian Literature, Luis Alberto Ramirez

Theses and Dissertations

This thesis establishes a framework for analyzing the role of hope in young adult and adult dystopian novels. The first chapter establishes what hope is and what facets are focused on in establishing a framework for hope in a dystopian novel. This framework is based on figures such as Aquinas and Aristotle and uses Gravlee and Cartwright to establish a consensus on hope. Hope is an integral part of the human experience that comes in two states: pseudo-hope and true hope. True hope is a future desire for something good that is difficult to obtain but not impossible. It is …

Connecting The Dots: Exploring The Relationship Between Avian Eggshell Pigmentation And Paternal Provisioning Effort, Kara E. Hodges

Theses and Dissertations

In a number of bird species, eggs laid by females breeding in the same population can vary extensively in the extent of their eggshell pigmentation, but the adaptive significance of this intraspecific variation remains unknown. One hypothesis posits that shell pigmentation is an honest signal of female quality that reflects her level of oxidative stress, one that is used by males to inform their subsequent paternal investment. We employed a reciprocal clutch cross-fostering design to test whether provisioning by male house wrens (Troglodytes aedon) responds to the clutch pigmentation of their mates. In experimental replicates, dark clutches were swapped with …

Modified Ambient Mass Spectrometric Methods For Field Screening And Confirmation Of Forensic Evidence, William Lee Fatigante

Theses and Dissertations

The utility of field-portable analytical instrumentation has the potential to revolutionize many fields of science, particularly for forensic science and law enforcement. While colorimetric testing can be employed for drug evidence screening, the influx of novel psychoactive substances has significantly decreased the effectiveness of this investigation strategy. One approach to meeting the needs of today’s practitioner is coupling flexible, ambient ionization techniques with portable mass spectrometric (MS) instrumentation. Ambient ionization techniques have a rich history of being amendable to the sample at hand. Since their inception in 2005, numerous techniques saturate the field. The main drive for this development is …

An Intersectional Examination Of Criminally Involved Women Of Color With Mental Illness, Cailin Rosemary Mcdermott

Theses and Dissertations

Women, people of color, and people with mental illness are fast growing populations in the criminal justice system. However, research tends to overlook the women of color with mental illness who exist at the intersection of these statuses. The current thesis attempts to apply an intersectional framework to the analysis of the narratives of these multifaceted women to explore the ways that their varying positions in society interact to shape unique life experiences. I analyzed a secondary data set of semi-structured life-course interviews with 65 women on a Seriously Mentally Ill (SMI) probation caseload. Implementing a grounded-inspired approach, the interviews …

Suicide Literacy And Laypersons’ Ability To Accurately Recognize Suicide Warning Signs And Risk Factors, Salman Ibrahim

Theses and Dissertations

Suicide is considered a public health crisis in the United States due to the large number of individuals attempting and completing suicide each year. Oftentimes, the first line of defense or “gatekeepers” against suicide is non-mental health professionals. The body of literature on suicide risk assessment has not explored the efficacy of non-mental health professionals’ ability to accurately recognize various levels of suicide risk. This study focused on examining whether non-mental health professionals ability to accurately recognize suicide risk in others is influenced by their level of suicide literacy (knowledge regarding the various aspects of suicide). This study also examined …

Shying Away From Sex: Examining Fear Of Negative Evaluation And Body Esteem As Mediators In The Associations Between Shyness And Sexuality, Carlie Grace Palmer

Theses and Dissertations

Researchers have examined how shyness influences broad aspects of relationships (i.e., quality, satisfaction); however, little is known about how shyness impacts sexuality, specifically, within committed relationships. This study examined associations between shyness and sexual frequency and sexual satisfaction within committed young adult relationships. Potential explanations for these associations (i.e., fear of negative evaluation and body esteem, consecutively) were also examined. Participants included 3,670 individuals (61.6% female) ages 30-35 from the United States who were in committed dating or marital relationships. Results revealed that shyness was negatively associated with sexual frequency and satisfaction among men and women. In addition, fear of …

Measuring Influence On Linear Dynamical Networks, Jaekob Chenina

Theses and Dissertations

Influence has been studied across many different domains including sociology, statistics, marketing, network theory, psychology, social media, politics, and web search. In each of these domains, being able to measure and rank various degrees of influence has useful applications. For example, measuring influence in web search allows internet users to discover useful content more quickly. However, many of these algorithms measure influence across networks and graphs that are mathematically static. This project explores influence measurement within the context of linear time invariant (LTI) systems. While dynamical networks do have mathematical models for quantifying influence on a node-to-node basis, to the …

Education Facilities – Primary And Lower Secondary School, Yllka Kadriu

Theses and Dissertations

The statement "We shape our buildings, and thereafter they shape us" seems to be directly related to this thesis topic. This topic as much as it is interesting in terms of design, so it is important because school it is the place where each of us spend most of our shaping years at. Schools design plays a very important role in improving the level of education and the well-being of society. As architects, it is our “obligation” to design them in a way that the learning spaces motivate and inspire creativity to the students, which is certainly achieved with larger, …

Hydrologic And Biologic Responses Of Anthropogenically Altered Lentic Springs To Restoration In The Great Basin, Leah Nicole Knighton

Theses and Dissertations

Water is a limited and highly valued resource in the semi-arid Great Basin. Surface water sources are often small and widely spaced apart, comprising only 1-3% of the surface area of the overall landscape. Despite their small size, these springs and surrounding wet meadows have a substantial effect on the surrounding environment. Springs provide drinking water, forage and cover for livestock and wildlife, habitat for diversity of plant species and a resource for human-related activities. In recent years, many of these springs have become dewatered due to diversions of groundwater for municipal water and agriculture, and climatic shifts in precipitation …

Bioaerosols Associated With Evaporative Cooler Use In Low-Income Homes In Semi-Arid Climates, Ashlin Elaine Cowger

Theses and Dissertations

Asthma is the leading chronic illness in children in the United States. Since children in the U.S. spend a majority of their time indoors there is an increased need to understand key sources of daily asthma triggers in the home. Bacterial endotoxin, dust mite allergens and β-D-glucan have been shown to be potent inducers of asthma attacks, and high levels of these allergens in homes can trigger attacks in those with asthma. We aim to better understand the risks to those with asthma that might be associated with evaporative cooler (EC) use in low-income homes. ECs are often promoted because …

Role Of Epigenome And Microbiome In Cannabinoid And Aryl Hydrocarbon Receptor-Mediated Regulation Of Inflammatory And Autoimmune Diseases, Zinah Zamil Al-Ghezi

Theses and Dissertations

Inflammation is considered to be the underlying cause of a majority of clinical disorders. Thus, studies aimed at understanding the signaling pathways that trigger inflammation could have significant translational impact. In the current study, we investigated the effect of activation of cannabinoid (CB) and Aryl hydrocarbon hydroxylase (AhR) receptors on the inflammatory response. To that end, we used cannabinoids such as Δ (9)-Tetrahydrocannabinol (THC) and cannabidiol (CBD), and a well-established AhR agonist namely 2,3,7,8-Tetrachlorodibenzo-p-dioxin (TCDD). These were tested against two inflammatory disease models: 1) Experimental autoimmune encephalomyelitis (EAE), an animal model for human multiple sclerosis (MS), and 2) Exposure to …

Effects Of Human Dopamine Transporter (Dat) Mutations And Novel Allosteric Modulatory Compounds In Disrupting Hiv-1 Tat-Dat Protein Interaction, Pamela Marie P. Quizon

Theses and Dissertations

More than 37 million people are living with HIV worldwide. Despite the widespread use of antiretroviral therapy (ART), up to 70% of HIV-positive individuals suffer from cognitive and behavioral deficits collectively known as HIV-associated neurocognitive disorders (HAND). HIV-mediated damage to the dopaminergic system is a mediating factor in HAND. Dopamine (DA) transporter (DAT)-mediated reuptake is essential for maintaining DA homeostasis. Because most ART cannot efficiently cross the blood-brain barrier (BBB), the brain serves as a viral reservoir that facilitates the spread of infection to microglia and astrocytes. Infected cells shed viral proteins such as Tat, which plays a critical role …

Association Between Snps In The Vitamin D Binding Protein, Vitamin D Status, And Aggressive Prostate Cancer By Race, Diana Diaz

Theses and Dissertations

Prostate cancer incidence and mortality have been decreasing in recent years, but it remains the most commonly diagnosed cancer among men. Racial disparities exist in prostate cancer with African Americans (AAs) having notably higher rates of incidence and mortality, lower survival rates, and are more likely to be diagnosed with a highergrade cancer compared to European Americans (EAs). Genome-wide association studies have revealed several single nucleotide polymorphisms (SNPs) within the vitamin Drelated GC gene that may be associated with prostate cancer aggressiveness. In addition to SNPs, previous research has suggested that low levels of 25-hydroxyvitamin D (25(OH)D) may be related …

Pre-Exposure Prophylaxis (Prep) For Hiv Prevention: A Mixed-Methods Study Of Sexual Risks And Knowledge, Perceptions, And Willingness Of Prep Use Among African American Women In The South, Jamie Troutman

Theses and Dissertations

There are approximately 1.1 million people living with HIV in United States, with nearly 40,000 new diagnoses annually. Significant regional and racial disparities are associated with HIV diagnoses — with the South experiencing the greatest burden of HIV and African American women accounting for 60% of new diagnoses among women. Pre-exposure prophylaxis (PrEP) has been designated as an effective tool to prevent HIV transmission among individuals who may be at risk of HIV infection. Earlier PrEP research has focused mainly on at-risk groups such as men who have sex with men (MSM). Previous PrEP research involving African American women included …

Assessing The Functions Of Prescription Stimulant Abuse Among College Students, Matthew J. Dwyer

Theses and Dissertations

Non-medical prescription stimulant use (NMPSU), such as using medications like Ritalin, Adderall, and Concerta without a prescription or at a higher dosage than prescribed, is a rising trend in American adults. Use is most prevalent among college age adults (18-25 years old). Survey research among experienced users has identified several reasons college students are engaging in NMPSU, including enhancement of cognitive, athletic, and social performance, but less is known about how the relative reinforcing value differs based on the reasons of use. Behavioral economic drug purchase tasks have been used to capture reinforcer strength and motivation related to use of …

Exploring Construct Validity And Measurement Invariance Of The Cyberbullying Experiences Survey, Kendall Moore

Theses and Dissertations

Given recent calls for advancing valid instrumentation in the field of cyberaggression, the present study evaluated construct validity and measurement invariance for the Cyberbullying Experiences Survey (CES) in a high school and college student sample. A series of confirmatory factor analyses (CFA), reliability analyses, and a nomological net evaluation were conducted to address these aims. The data did not provide support for the hypothesized four-factor model for cyberaggression or cybervictimization (i.e., unwanted contact, malice, deception, and public humiliation). Upon implementing suggested and theoretically supported modification indices, support for a four-factor solution for both cyberaggression and cybervictimization was provided.

To subsequently …