Digital Commons Network^™

Association Between Lifetime Adverse Events, Emotion Dysregulation, Posttraumatic Stress Symptoms, Acculturation, And Chronic Pain: A Moderated Mediation Model, Miriam El-Haj

Theses and Dissertations

The association between traumatic experiences and chronic pain is well established. Lesser is known about how acculturation might affect this relation, specifically with Hispanics. In the present study, self-report measures on traumatic experiences, posttraumatic stress symptoms, emotion dysregulation, chronic pain, and acculturation were administered to 140 participants (71.4% females) aged 18–65 years old (M = 35.06, SD = 11.55), to determine whether acculturation moderates the relation between adverse lifetime experiences and chronic pain as mediated by posttraumatic stress symptoms and emotion dysregulation.

Those who were highly acculturated to the U.S. Anglo culture were higher on chronic pain than those who …

Design And Testing Of A Modular Laser System With Laser Machining And Bioprinting Capabilities, Jesus Gonzalez

Theses and Dissertations

This thesis introduces the applications of ultrafast lasers while focusing on their bioprinting capabilities. A custom system was designed to utilize a femtosecond laser for 2D and 3D applications. The characteristics of lasers allow them to be efficiently used in machining, 3D printing, research, and more. Their power and precision allow them to be used for delicate work such as bioprinting. Bioprinting is a field holding great potential to benefit society. Studies conducted over the years prove its usefulness in printing cells and biomaterials, while showing there is still much to improve upon before being able to print fully functioning …

The Digital Reading Experiences Of Middle School Readers: A Phenomenological Study, Laura A. Hayward

Theses and Dissertations

Reading digitally is part of the 21st century New Literacies, residing in the curriculum as a comprehension skill developed with print reading skills. Differences exist between purpose of digital reading and print reading, manifested in the association of digital reading as a mostly non-fiction genre, the immediacy to digital information and its relevance to a reader’s decision about the usefulness of the information. Contrastingly, print reading can be fiction or non-fiction with access to all the text. The differences suggest that learning focused on immediate evaluation, synthesis, and application of information while reading digitally should be taught in the context …

The Correlation Among Metabolic Syndrome Risk Factors, Hemodynamics, And Arterial Elasticity In Hispanic College Students, Paloma J. Mendoza

Theses and Dissertations

PURPOSE: The purpose of this study was to determine the correlation among MetS risk factors, hemodynamics, and arterial elasticity in Hispanic students attending The University of Texas Rio Grande Valley.

RESULTS: Systolic blood pressure (SBP), diastolic blood pressure (DBP), and fasting glucose (GLU) were the only components of MetS that had a significant correlation with large arterial elasticity (SPB: males: -.477 and females: -.503; DBP: females: -.300; p

CONCLUSION: MetS risk factors significantly correlated with both arterial elasticity and hemodynamic components. Uniquely in this population, waist circumference and systemic vascular resistance was reversely associated.

Educator Perspectives Of High-Stakes Testing In An Urban School District In Deep South Texas, Sergio R. Garcia

Theses and Dissertations

The purpose of this study was to explore how the high-stakes testing setting and the state assessments have influenced elementary teachers and other school professionals’ approach to preparing students for standardized tests. Policymakers and the public see standardized tests as simple quantifiable measures of school quality and student learning. They assume that high stakes tests will influence teachers and students to try harder and that the results will be used rationally to benefit all students.

Fredrick Herzberg’s Motivation-Hygiene Theory was used as a framework for this research. Study participants included nine experienced elementary school educators in a large urban district …

Shattering Taciturnity: The Use Of Visual Arts As A Method Of Communication And Expression, Jesmil M. Maldonado Rodriguez

Theses and Dissertations

Silence an action that conceals a person’s memories, thoughts, emotions, fears, and insecurities, making them crave a method of expression. In this case, the Visuals Arts serves as an approach to investigate, create, understand, accept, and confront the darkness within the artist's psychological and emotional state. Inspiration taken from vibrant colors and insects found within Puerto Rico's natural sources, how these interact, relate, and consume the human within. By creating a series of artworks, the artist starts to comprehend how silence has taken over her life. Taciturnity has become the flame that ignited the artistic flow that leads to the …

Genetics And Morphology Of Invasive Tubastraea Species Within The Gulf Of Mexico: A Case Study Of Species Misidentification And Distribution, Amelia E. Mcclure

Theses and Dissertations

The invasive corals, Tubastraea coccinea and Tubastraea micrathus, are known to thrive in reefs within the Gulf of Mexico (GOM). Many studies have indicated that species within this genus are spreading throughout the western Atlantic due to their successful invasion on degraded and artificial reef systems. In the Northern GOM, artificial reefs have been created from decommissioned oil rigs and sunken vessels to provide a hard substrate for coral growth. Although, this method is demonstrating success, it is also facilitating, the dispersal of undesired species. The species, T. coccinea and T. micranthus, were thought to be the only …

Women In Law Enforcement: The Impacts And Obstacles They Face In A Hispanic- And Male-Dominated Culture, Lisa M. Seiser

Theses and Dissertations

Despite a lack of female law enforcement representation in police departments across the country and especially in the Border Patrol, there have been minimal studies performed that focus on the obstacles women face in these professions. The purpose of this study was to attempt to understand the lived experiences of female law enforcement officers/border patrol agents in this male-dominated profession, but also adding the aspect of them working in a Hispanic-dominated culture.

The findings revealed these women in law enforcement working in a Hispanic area face many of the same obstacles as women in other parts of the country - …

Outcomes For Professionals And Companies Through Student-Professional Reverse Mentoring Sessions, Nicholas Burr Gubler

Theses and Dissertations

This qualitative inquiry explores the outcomes that professionals, and their companies, experience when they participate in a student-professional reverse mentorship. Professional development is used across all trades and professions as a way to increase employee skills and improve product/service quality. Reverse mentoring, where a novice teaches the more experienced individual, is a relatively new approach in professional development. When the reverse mentoring scenario is between students and professionals, instead of professionals and their colleagues, we know that students benefit from the reverse mentoring process but little is known about what outcomes the professionals experience. This research reports that professionals experience …

Degree Of Bilingualism, Age, Income And Teacher Ratings Of Giftedness As Potential Predictors Of Dichotic Listening Performance, Francisco J. Sierra

Theses and Dissertations

Bilinguals and gifted individuals have consistently shown distinctive patterns of performance on measures of brain laterality and auditory processing. The purpose of this study is to examine the relationship between bilingualism, teacher ratings of giftedness, and auditory divided attention by comparing children and adults with income partialed out. Child participants from first to fifth grade were included in addition to an adult comparison group. Assessment of bilingualism, auditory divided attention, and giftedness occurred via the Woodcock-Munoz Language Survey-III (WMLS-III), the Dichotic Test of Attention (DITA), and the Hispanic Bilingual Gifted Screening Instrument (HBGSI). The main hypothesis of this study is …

A Compositional Analysis Of Artificial And Terrestrial Analog Martian Regolith Simulants, Beverly Watson Kemmerer

Theses and Dissertations

Over the past 50 years, significant advances in the knowledge of the topography, climate, and geology of Mars have taken place. The global Martian regolith composition is highly basaltic, primarily composed of pyroxene, plagioclase, and olivine, a mixture of Fe oxides and Fe-Ti oxides, and some alteration minerals, i.e. sulfates, carbonates, and clays. The particle size distribution of Martian regolith ranges from 1 µm to 1000 µm, with average Martian soil grain sizes being 250 µm to 300 µm. These regolith properties, as well as geotechnical properties, all play a part in the outcome of certain in situ resource utilization …

Earth – Mars Cycler Vehicle Conceptual Design, Bhumika Patel

Theses and Dissertations

This thesis summarizes a conceptual design for an Earth – Mars Cycler vehicle designed to transfer astronauts between Earth and Mars. The primary objective of the design study is to accommodate the crews’ needs and to estimate the overall mass and power required during Earth – Mars transfer. The study defines a concept of operations and system functional requirements and discusses the systems breakdown and subsystems design analysis. Systems developed for the cycler vehicle is designed primarily for the S1L1 cycler trajectory. The initial sizing of cycler subsystems is based on reference data from historical human spaceflight. The study performed …

Design Of A System For Inexpensive Underwater Fiber Optic In Vivo Imaging And Mass Balance Accounting Of Tissue Engineering Candidates, Nicole Melissa Bueno Guerrero

Theses and Dissertations

The goal of this project is to create a prototype bioreactor that mimics a cell’s microenvironment. The ultimate goal is to set up an array of 36 bioreactors in parallel and monitor them with an array of sensors that will enable full mass and energy balance accounting and in vivo imaging. This thesis will analyze the various options available for cell imaging, as well as describe the construction of a bioreactor design in which cell images can be obtained without removing the cells from the bioreactor. The hypothesis for this project is that imaging of unstained cells in an aquarium …

Social Groups Characterization And Dynamics: A Network Science Approach, Josemar Faustino Da Cruz

Theses and Dissertations

Over the course of our lives, we tend to transition through many social groups. From an early age, our first social group is our family, then we have our schoolmates, later in life, our coworkers, and likely another family. As we move from one group to another, we embed ourselves in the dynamics of social groups’ losses and gains of new members. These dynamics are a complex system of interactions, which at scale, form the structural basis of our societies. In many years of sociological research, the details of social group interactions remained poorly understood. Certainly, not because of lack …

Single Photon Avalanche Diode (Spad) Array Quenching And A Novel Quantum Random Number Generator (Qrng), Mano Rahul Kumar Pakalapati

Theses and Dissertations

Single Photon Avalanche Diodes, SPADs is a single-photon sensitive light detector with capabilities of pico-second timing resolutions and offer potential for enhancing various fields of science to evolve into quantum-age. SPAD has applications ranging from quantum computing, cryptography (QKD) to applications in medicine such as neural imaging and Single Photon Emission Computed Tomography (SPECT). SPAD arrays are gaining popularity as they enable for parallel photon detection and 3D imaging. To account for the process tolerances and aging, each SPAD-pixel needs a tunable quenching circuit in the frontend for post-fabrication fine-tuning, this research work presents a novel Dual Triggered Tunable Active …

Gut Content Analysis Of Benthic Foraging Fish Compared To Invertebrate Infauna Distributions In Dredged Vs. Undredged Habitats, Danielle Louise Juzwick

Theses and Dissertations

The Indian River Lagoon (IRL) has experienced a loss in seagrasses due to organic sediment accumulation and harmful algal blooms. Seagrasses are an essential nursery habitat for many fishes and benthic invertebrates. IRL fish known to utilize benthic habitat and feed on invertebrates include Atlantic croaker (Micropogonias undulates), juvenile Red Drum (Sciaenops ocellatus), and Mojarra (Eucinostomus spp.). The most abundant major infaunal taxa of the IRL are crustaceans, polychaetes, and mollusks. Environmental dredging in the IRL’s Turkey Creek is intended to improve water quality, remove harmful sediments and restore benthic habitat. Such dredging may impact benthic invertebrate populations and, indirectly, …

Nursery Habitat Characteristics Of Juvenile Tarpon, Megalops Atlanticus, In The Northern Indian River Lagoon, Fl, Austen Zugelter

Theses and Dissertations

The life history of tarpon is complex, involving multiple ontogenetic habitat shifts, which spatially separate larval, juvenile, and adult populations. Juvenile tarpon are obligate users of mangrove and marsh ecosystems as nursery habitats, whereas adults use the coastal ocean. Habitat loss/fragmentation due to coastal development however, threatens the availability and quality of obligate juvenile tarpon nursery habitat. Furthermore, there is a general lack of data on the environmental characteristics and spatial coverage of these important habitats. The goal of the present study was to identify potential environmental characteristics related to juvenile tarpon habitat utilization in the northern Indian River Lagoon, …

Integration Of Inboard Propulsion In Shock Mitigating Membrane Hull Technology, Korrey Rotkiske

Theses and Dissertations

Membrane Hull Technology is a strength based marine vessel design concept that seeks to utilize the in-plane properties of fiber reinforced composites to generate a lighter weight vessel with inherent shock mitigation benefits. MHT has been applied on several Naval crafts yet the design features of inboard propulsion systems have not been addressed. Inboard propulsion systems are a very common form of propulsion used in many types of marine vessels especially larger vessels. This thesis seeks to overcome the inboard engine mounting challenges of MHT which limits use of this technology in the marine industry. The fundamental design elements of …

Demographic Factors Affecting Freshman Engineering Students’ Attitudes Toward Mathematics At A University In Saudi Arabia, Essa Abdullah Alibraheim

Theses and Dissertations

This study of freshman engineering students enrolled at Imam Abdulrahman Bin Faisal University (IAU) in Saudi Arabia investigated the relationship between the students’ attitudes and their demographic characteristics. Specifically, the study assessed the relationship between students’ demographic characteristics and how the characteristics related to five variables associated with attitudes toward mathematics: attitude toward success in mathematics, confidence in learning mathematics, mathematics anxiety, awareness of the usefulness of mathematics, and effectance motivation in mathematics. A total number of 157 male students enrolled in Calculus 1 participated in the survey. Findings revealed that the freshman engineering students had positive attitudes toward mathematics; …

Some Free Boundary Problems For The Nonlinear Degenerate Multidimensional Parabolic Equations Modeling Reaction-Diffusion Processes, Amna Abu Weden

Theses and Dissertations

This dissertation presents a full classification of the short-time behavior of the interfaces or free boundaries for the nonlinear second order degenerate multidimensional parabolic partial differential equation (PDE) ut −∆u m +buβ = 0, x ∈ R N ,0 < t < T (1) with m > 0, β > 0,b ∈ R, arising in various applications in fluid mechanics, filtration of oil or gas in a porous media, plasma physics, reaction-diffusion equations in chemical kinetics, population dynamics in mathematical biology etc. as a mathematical model of nonlinear diffusion phenomena in the presence of the absorption or release of energy. Cauchy problem with compactly supported and nonnegative initial function …

Computational Models For Biological Locomotion In Gels, Hashim Mohammed Alshehri

Theses and Dissertations

We investigated Low Reynold’s Number Locomotion in two-phase biological gels. The gel is composed of two materials: a viscous fluid solvent phase and a viscoelastic polymer network phase. A novel Two-phase Immersed Boundary Method (IBM) is developed to simulate the complicated interactions between an elastic boundary and a mixture of two fluids with very different physical properties. A further extension of the method is developed for the case where fluids satisfy partial-slip and free-slip conditions on the elastic boundary. Our major conclusions are summarized as following: (i) Our numerical scheme is proved to be robust and efficient. It can successfully …

Semantic And Qualitative Physics-Based Formal Reasoning For Functional Decomposition In Mechanical Design, Xiaoyang Mao

Theses and Dissertations

Function modeling plays an essential role in academy design studies, yet a lack of acceptance in industry. A possible reason is that the designer must have well understand of the controlled vocabularies and grammars to utilize this method. The research presented in this dissertation is to fill this gap so that designers can use function-based design method without relevant knowledge. In graph-based function models, the function verbs and flow nouns are usually chosen from predefined vocabularies. The vocabulary class definitions, combined with function modeling grammars defined at various levels of formalism, enable function-based reasoning. However, the text written in plain …

Assessing The Rehabilitation Status Of The Reflooded Bahia Grande, Texas Based On Trace Gas Fluxes, Benthic Macroinvertebrates, And Fish Community Data Along Salinity And Seagrass Gradients, Catherine M. Eckert

Theses and Dissertations

The Bahia Grande is a 6,500-acre tidal basin located at the southernmost tip of Texas. Tidal flow into this coastal estuary was cut off by construction projects in the 1930s, causing the basin to dry up for ~70 years. In 2005, a pilot channel was built to reconnect the estuary to tidal waters, allowing the basin to refill. However, the pilot channel, in addition to other barriers within the basin, do not allow for adequate tidal exchange, leading to intermittent, extreme hypersalinity. Presumably because of the extreme hypersalinity in parts of the Bahia Grande, seagrass beds, which play vital roles …

A Landscape-Scaled And Community Ecology Approach To Wildlife Corridor Design In South Texas, James A. Stilley

Theses and Dissertations

A formidable challenge in landscape ecology is developing a sound resolution to mitigate the impacts of habitat fragmentation and restore connectivity to a degraded landscape. The problem is worldwide landscapes are becoming primarily anthropogenic and areas set aside for wildlife are small and isolated. Researchers’ have developed the concept of the wildlife corridor to mediate this situation but a proper methodology to implement this concept is still in its infancy. This study aims to uncover a quantitative and repeatable wildlife corridor design methodology based on the least cost analysis strategy with both a singular focal taxa approach and a comprehensive …

Viability Of Wetland Crops For Use In Treatment Wetlands: Nitrogen Removal From Water And Production Of Food, Andrew Denson Corder

Theses and Dissertations

Treatment wetlands are used to treat wastewater from a variety of sources, but their functionality depends on the macrophytes present therein. To better understand the viability of wetland macrophytes both as sources of food and as agents of nitrogen removal from wastewater, this study quantified plant growth, food production, and nitrogen removal capacity of three common wetland crops as well as three locally dominant graminoid species in a variety of relevant ecological contexts. All six plant species and a control were grown over a ten-week period in three related experiments: (1) under three moisture regimes, (2) with or without competition …

“These Sculptur’D Lines”: An Analysis Of Protestant Burial Practices On St. Croix During The Danish Colonial Period (1733-1917), Brittany Higgs

Theses and Dissertations

This study argues that there are temporally and socially observable trends present in a sample of Protestant cemeteries from St. Croix’s Danish Colonial Period, as evidenced by the analysis of gravestone characteristics including iconography, morphology, and epitaph. Specifically, gravestones within the sample became noticeably more simplistic in the mid-19th century, which directly reflects St. Croix’s economic decline following emancipation. Although the iconographic and morphological characteristics of the gravestones for men and women and children and adults are largely identical, the epitaphic inscriptions for these groups exhibit a great deal of differentiation. Through analysis of these epitaphs, we discover that society …

Integrated Perspective Of Low Self-Control And Lifestyle-Exposure: Gender Differences In Victimization Risk Among South Korean Youth, Hyounggon Kwak

Theses and Dissertations

This dissertation examined the link between low self-control, risky lifestyles, and victimization, using data from 1,057 South Korean adolescents included in the Study on Childhood Delinquency. Specifically, this study explores a full mediation model to test whether risky lifestyles (unstructured activity, association with deviant peers, and delinquency) account for the effect of low self-control on victimization. The results indicated that low self-control only had an indirect effect on victimization primarily through unstructured time and one’s own delinquency. In addition, this study explored whether variations in the adolescent routine activities foster engagement in delinquency via association with deviant peers. Advancing prior …

Understanding The Differences In The Radioprotection Activity Of The Vitamin E Tocols, And Their Implications In Developing Effective Radioprotectors, Ujwani Nukala

Theses and Dissertations

With the increased use of ionizing radiation for various purposes like radiotherapy, nuclear power generation, sterilization, the likelihood of intentional or unintentional radiation exposure is increasing and there is an unmet need for effective radiation countermeasures that are safe, efficient, easy to administer. Vitamin-E is a well-known antioxidant, consisting of eight different vitamers, including four tocopherols (α, β, γ and δ) and four tocotrienols (α, β, γ and δ), which are structurally very similar and collectively known as tocols. Though alpha-tocopherol has been considered the primary form of vitamin-E and extensively studied, tocotrienols have recently gained attention for their superior …

Susceptibility Of Borrelia Burgdorferi Morphological Forms To Chemical Antimicrobials, Ann-Aubrey Kaiwilani Reid

Theses and Dissertations

Borrelia burgdorferi is the etiological agent of Lyme disease. Not much is known about the susceptibility of this organism to chemical disinfection. Current antimicrobial susceptibility test methods, such as those published by the American Society for Testing and Materials (ASTM), usually require assessment of the number of colony forming units (cfu) of growing organisms on plates following exposure to an agent. For fast-growing organisms, plates are ready for counting 1-2 days post plating, while several weeks may be needed for slower growing organisms. Spirochetes, like B. burgdorferi are difficult to grow on solid media and typically require long incubation periods, …

Investigation Of Thymidine Kinase 1 In Cancer Progression, Eliza Esther King Bitter

Theses and Dissertations

Understanding cancer biomarkers for diagnosis and prognosis leads to improved patient treatments and care. This thesis addresses the relevance of thymidine kinase 1 (TK1) as a cancer biomarker and the role of TK1 in cancer progression. Worldwide, cancer leads to more than 12 million deaths annually. In the United States alone, each year over 1.5 million cases will be diagnosed and over half a million persons will die. The most prevalent cancer types include skin, lung, breast, prostate, and colon. TK1 is known to be present in the serum of patients with multiple cancer types, including lung, breast, colon and …