Digital Commons Network^™

Predictive Analytics For Emergency Department Patient Flow In Regards To Incoming Rate, Admission, And Leaving Behaviour, Harish Kumar Manchukonda

Theses and Dissertations

In this work, we produce several prediction models for aspects of hospital emergency departments. Firstly, we demonstrate the use of a recurrent neural network to predict the rate of patient arrival at a hospital emergency department. The prediction is made on a per hour basis using date, time, calendar, and weather information. Then, we present our comparison of two prediction systems on the task of replicating the human decisions of patient admittance in a typical American emergency department. Again, a recurrent neural network (RNN) was trained to learn the task of selecting the next patient from the waiting room/queue to …

Factors Associated With Quality Of Life And Dialysis Compliance, Viviana Garcia Guerra

Theses and Dissertations

This dissertation study explored the relationship between quality of life (QoL) and dialysis compliance with family support, spirituality, age, gender, and socioeconomic status (SES) among people with end stage renal disease (ESRD). Utilizing the Biopsychosocial Spiritual Framework, this study pursued to inform mental health professionals working with people undergoing dialysis about the factors that influence QoL and dialysis compliance. This descriptive quantitative dissertation study included 79 participants who self-identified as persons receiving either hemodialysis or peritoneal dialysis. Participants were members from closed social online forums and the National Kidney Foundation.

The current study found that family support and SES predicted …

The Underrepresentation Of African American Doctoral Students In College Of Education Disciplines At Hispanic Serving Institutions And Emerging Hispanic Serving Institutions In The Southwest United States (Texas, New Mexico, Arizona, California, Nevada And Colorado), Matthew Lloyd Atterberry

Theses and Dissertations

African Americans are underrepresented in higher education, especially in the graduate and doctoral level. Furthermore, research has identified numerous factors influencing African Americans to pursue doctoral studies in College of Education disciplines at postsecondary institutions of higher learning. However, there is a gap in the literature pertaining to factors influencing African Americans to pursue graduate and/or doctoral studies in College of Education disciplines at Hispanic Serving Institutions and Emerging Hispanic Institutions of higher learning in the Southwest United States. The purpose of this study is to bridge the gap pertaining to demographic factors in relationship to motivation and self-efficacy (Confidence) …

Comparing Novel And Traditional Sampling Methodologies To Analyze The Population Status Of The Rio Grande Cooter (Pseudemys Gorzugi), Amy P. Bogolin

Theses and Dissertations

The Rio Grande Cooter, Pseudemys gorzugi, is an understudied aquatic turtle species of conservation concern in the Rio Grande, Pecos, and Devils river systems. Traditional sampling methodologies for aquatic turtle species face numerous challenges, but novel sampling methodologies, such as drone-based surveys and environmental DNA analysis, may address these issues. This study compared novel sampling methodologies to traditional sampling methodologies in mean detections and identifications of aquatic turtle species, developed and implemented an environmental DNA assay to detect P. gorzugi, and characterized P. gorzugi habitat. Following an introductory chapter, each task is addressed by chapter and formatted to …

Lipid Analysis, Fluorescence Microscopy And Flow Cytometry As Tools To Evaluate Microalgae For Potential Biofuel Production, Giovanina Aimee Hinojosa

Theses and Dissertations

Petroleum-based crude oil is nonrenewable and toxic to the environment, leading to a need for a more efficient and environmentally effective replacement. Microalgae produce lipids which can be converted to recyclable biofuels; therefore, research in lipid production by algae is becoming important for an economic and environmental sustainability. Microalgae can re-absorb atmospheric CO2 and have rapid growth, thereby lowering greenhouse gasses (GHGs) emission, renewability, and simple growth requirements.

Nannochloris sp. is a marine microalga that is amenable for lipid production because there is little research on it so this study will focus on using flow cytometry, fluorescence microscopy and other …

Mathematical Modeling Of Nonlinear Dynamics Of Blood Hormones On The Regulatory System, Gabriela Urbina

Theses and Dissertations

We study a mathematical modeling of nonlinear dynamics of blood hormones, which includes glucose and insulin. On Chapter I, II, III and IV, we introduce this work, analyze an effect of the secreted insulin by the pancreatic beta cells and glucagon hormones and state concluding remarks, respectively. This model considers the time evolution of nonlinear dynamics of the equations for glucose, glucagon and insulin concentrations plus insulin and glucagon actions and the secreted insulin as a result of elevation of glucose in the blood plasma. Using both analytical and numerical procedures, we determine such quantities using different parameters for different …

Validation Of Finite Element Couple Level-Set Volume Of Fluid Method For Plunging Breaking Wave Prediction, Graham Hubbard

Theses and Dissertations

Predictive capability of computational fluid dynamics simulations for the prediction of plunging breaking wave is assessed. Laminar flow simulations are performed for dam break, solitary wave run up on a slope and flow over a submerged bump using OpenFOAM, a finite volume solver with volume-ofluid (VoF) interface capturing method, and Proteus, a finite element solver with coupled level-set/ volume-ofluid (CLSVoF) methods. CLSVoF predicts wave elevation before the plunge, and primary and secondary plunger shapes better than VoF in all the cases. The primary limitation in the simulation is the airflow, which results in diffused plunger tips in VoF simulations, and …

A Mathematical Development Of Minimal Surface Theory: From Soap Films To Black Holes, Timothy Pitts

Theses and Dissertations

Minimal surfaces are a special subset of surfaces that have gone through a long and extensive development and have also led to many fruitful findings in mathematics. Several periods that are key to the progression of the theory are coined as Golden Ages for the field’s development. Here, a historical and mathematical development of minimal surface theory is presented that spans from its inception in the late 18th century to the present day. Along with the development, there is an emphasis on showing connections of minimal surfaces to various natural phenomena that occur such as soap films, black holes, biological …

Exploring Interactions Of Phyllosphere Epiphytes With Plant Pathogenic Bacteria Pseudomonas And Xanthomonas On Tomato, Ashley D. Turner

Theses and Dissertations

Recent studies have indicated the importance of resident microflora of plants in contributing towards overall plant health. Among difference components of the plant microbiome, Methylobacterium and Sphingomonas have been recognized as common residents of the phyllosphere for many host plants, however their role in disease control needs to be further investigated. The purpose of this study was to conduct experiments investigating the effectiveness of phyllosphere Methylobacterium and Sphingomonas isolated from red clover against common tomato phyllosphere bacterial pathogens, Pseudomonas syringae pv. tomato and Xanthomonas perforans. Additionally, this study uses X. perforans wild-type and X. perforans type VI secretion system …

Analysis Of Fatty Acids In Chukchi Sea Sediments, Damilola Ajadi

Theses and Dissertations

The Arctic Ocean and its marginal seas are key areas for understanding the global climate system. Climate change causes increased terrigenous materials to be carried into the ocean as well as higher production of marine organic matter in the ocean. This study determined the concentrations, distribution, and sources of fatty acids in core sediments from four locations: Stations H32, H30, BarC5 and H24 in the Chukchi Sea, which are in the Arctic Ocean. Fatty acids are valuable tracers of marine or terrigenous inputs and may give evidence to the extent of climate change. Fatty acids were analyzed, characterized using GC-MS …

A Bio-Inspired Classification System For Cyber-Physical-Human Identity Resolution, Mary Catherine (Kay) Michel

Theses and Dissertations

The Internet has created a need for understanding complex technology and identities today. Cybercrime can take years to solve, and a systematic design may aid in more rapid resolution. Classification of identities involves the arrangement of shared qualities or characteristics known as features set expression, useful for identifying specific types of cybercriminals based on empirical evidence and logic. In order for classification of a cyber identity to be explainable and acceptable to researchers, a holistic systematic approach is beneficial to organize natural and synthetic features of living and non-living organisms into a standardized model. Proven scientific methods in the biology …

The Relationship Between Place Attachment And Socioscientific Reasoning Among High School Students In Puerto Rico After Negotiation With Local And Foreign Socioscientific Issues, Lorraine Judith Ramírez Villarín

Theses and Dissertations

The purpose of this mixed-method study was to explore the relationship between place attachment and socioscientific reasoning (SSR) of Puerto Rican high school students through debate and discourse of local and foreign socioscientific issues (SSI). The specific research questions were, (1) what is the extent of the participants’ place attachment to the island of Puerto Rico, (2) are there differences in SSR between groups working with local and foreign SSI, (3) is there a correlation between place attachment and SSR, (4) are there differences in SSR between scenarios after SSI negotiation, and (5) do negotiation and discourse improve after SSI …

Design Of An Environmentally Responsive Grooming Tool To Aid In Underwater Navigation, Bruce Huntress Walker Iii

Theses and Dissertations

Underwater hull grooming is a proactive approach to ship hull husbandry. It has been defined as the frequent and gentle wiping of a ship hull coating to maintain it free of fouling. One of the challenges to implementing a grooming schedule is the control and navigation of the devices over the surface of the hull. This thesis presents prior research that has developed self-attaching rotating brushes as an effective method to groom fouling control coatings and the results from several years of implementation in the marine environment. The hypothesis of this thesis is that the condition of the ship hull …

Algorithmic Assembly Of Nanoscale Structures, Austin Luchsinger

Theses and Dissertations

The development of nanotechnology has become one of the most significant endeavors of our time. A natural objective of this field is discovering how to engineer nanoscale structures. Limitations of current top-down techniques inspire investigation into bottom-up approaches to reach this objective. A fundamental precondition for a bottom-up approach is the ability to control the behavior of nanoscale particles. Many abstract representations have been developed to model systems of particles and to research methods for controlling their behavior. This thesis develops theories on two such approaches for building complex structures: the self-assembly of simple particles, and the use of simple …

Introducing A Silverback To An Established Group Of Adult Female Western Gorillas (Gorilla Gorilla Gorilla), Claudia Martinez

Theses and Dissertations

In May of 2015, an attempt to introduce a new silverback (adult male) to an established group of six western lowland gorillas (Gorilla gorilla gorilla) housed at Gladys Porter Zoo failed. The introduction process was halted and only protected contact among the gorillas was allowed. On May 1, 2018 another introduction was initiated to three adult females.Twelve months of behavioral data were compared across three time periods and two environments. We predicted that an increase in agonistic and affiliative behaviors would occur while anxious behaviors would decrease. We observed a significant increase in affiliative behavior and a significant decrease in …

The Effects Of Salvia Hispanica On Biochemical Markers Related To Immune System, Hormone Regulation, And Lumbar Vertebrae In Postmenopausal Rat Model, Daisy M. Mendez

Theses and Dissertations

In women, with age and menopause there is increase in body weight and decreased immunity and bone mass. Due to severe side effects of currently available drugs for obesity and bone loss, new therapies with less side effects are sought after and alternative medications are becoming more popular. Recently, Salvia hispanica (SH), a herbal supplement is implicated in losing body weight. Currently, there is no information on how SH modulates obesity or bone health. In this study, effects of SH seed extract was investigated in a postmenopausal rat model on certain hormones, immune markers, and fourth lumbar vertebrae. The highest …

Individual Difference As A Factor In Ethical Decision-Making, Dan W. Reagan Jr.

Theses and Dissertations

Despite the dominance of modernistic ethics in counseling there has been a growing development of postmodern thought. There has been a growing understanding the limitations of ethical codes and purely rational thinking in ethical decision-making. Part of this new paradigm is an appreciation for the role of affect and context in the decision-making process. A post-modern approach to counseling ethics seems to be increasingly accepted among persons working in the social service field but little research has been attempted to evaluate the implications of such a change in training and practice. This study attempted to explore possible relationships between individual …

Detection And Enumeration Of Bacterial Pathogens In The American Oyster (Crassostrea Virginica), Mohammad Maruf Billah

Theses and Dissertations

American oyster (Crassostrea virginica) is a popular seafood for its delicacy and high nutritional value. Based on increasing concern about contamination of bacterial pathogens in raw oyster, my research objectives have been focused on detection and enumeration of two important bacterial pathogens, Escherichia coli and Salmonella spp. in the American oyster in south Texas waters, local markets and controlled laboratory studies. Immunohistochemical and RT-PCR analyses showed substantial bacterial pathogen’s presence in gills and digestive glands of oysters collected from San Martin Lake and South Padre Island as well as local markets. Laboratory studies showed increasing trend of both …

Factors That Contribute To Social Emotional Competence In Early Childhood And Parental Resilience, Jackeline Guillon

Theses and Dissertations

This study examined the effect gender, family income, maternal education and parental resilience have on the social emotional competence of children attending a childcare facility in the Rio Grande Valley. Identifying factors that are specifically linked to child social emotional competence may inform decisions about how to implement effective preschool programs for children. Until recently, the literature on social emotional competence has been limited and mostly focused on a child’s early life experiences and parenting behaviors. A quantitative design utilizing multiple regression analysis was used to test the null hypothesis in this study. The data was collected using the procedures …

Organizational Effects Of Exogenous Corticosterone On Vocal Development In A Wild Parrot, Rory Eggleston

Theses and Dissertations

Songbirds learn songs during a plastic phase in vocal development, similar to human vocal babbling. Research has focused on male song learning, a process influenced by gonadal steroids. Like humans, parrots are very plastic vocal learners and both sexes learn vocalizations throughout life. It is unclear how the endocrine system mediates environmental information with developing phenotypes in parrots. Corticosterone (CORT) is a sex-neutral hormone that can affect cognitive development, but its role in vocal development has not been experimentally tested in wild parrots. I quantified vocal babbling from nestling Green-rumped Parrotlets (Forpus passerinus) recorded in Venezuela. Nestlings received oral CORT-oil …

Topography Estimation Using Particle Swarm Optimization, Yelbir Kazhykarim

Theses and Dissertations

The Earth’s Vertical Gravity Gradient (VGG) can be used to map seafloor topography but presents a challenging inverse problem. A promising approach is forward modeling, in which one searches over a set of candidate topographies and selects the one whose predicted VGG best fits the observed one. The main bottleneck here is solving the associated high-dimensional and non-linear optimization problem. Yang et al (2018) demonstrated a method in which the topography is parametrized by heights of mass elements on a rectangular grid and the ≈ 104 dimensional optimization problem is tackled with simulated annealing (SA). We propose a computationally much …

Examining Various Aspects Of Zika Virus Dissemination In Aedes Aegypti, Ileana C. Lozano

Theses and Dissertations

South Texas is one of the few locations where Zika virus has been locally transmitted in the U.S. It has a climate which is distinct to other areas with autochthonous transmission, with extremely hot, dry summers and moderate winter temperatures. Studying mosquito transmission of Zika in a range of temperatures conditions replicating where virus transmission is occurring is essential in order to have a better understanding of transmission patterns. These factors were examined by infecting mosquitoes and monitoring the dissemination status through real-time PCR analysis.

To further characterize dissemination of Zika virus within south Texas mosquitoes a time series immunohistochemical …

Effects Of Arbuscular Mycorrhizal Fungi (Amf) On Growth And Herbivore Defenses In Sorghum Sudangrass (Sorghum X Drummondii), Jasleen Kaur

Theses and Dissertations

Chapter 2: In this chapter we have examined the role of trichomes in plant stress biology, reviewed the studies on herbivore X trichome interactions, and their role in plant defences. Ultimately, we have proposed new areas of research for future work.

Chapter 3: In this chapter, we examined whether AMF has cascading effects on insect community dynamics through attraction/repulsion of beneficial and damaging insects using Sorghum-sudangrass (Sorghum x drummondii), either inoculated with commercial AMF mix or left as control in lab and field experiments. Our results suggest positive effects of AMF on plant growth, and a lower initial incidence of …

Exploring Mechanical Properties And Configurational Energetics Of Toxbox Using Molecular Dynamics Simulation, Shams Mehdi

Theses and Dissertations

All-atom Molecular Dynamics Simulations (MDS) have been performed to obtain 5 ns trajectory of the solvated, neutralized, and equilibrated toxbox system in NPT ensemble at 300 K. This trajectory data has been used to calculate the configurational entropy of toxbox by employing a quantum mechanical approach. The method is based on evaluating determinant of the covariance matrix, built from generalized coordinates of all atoms for each frame. The upper limit to the configurational entropy of toxbox has been calculated to be 30,030 J/mol-K. A preliminary investigation has been conducted to study the effects of sequence-dependent DNA conformation (DNA Crookedness) on …

Gender Dynamics In Charreria Mexicana, Karen Melissa Flores Tavizon

Theses and Dissertations

This research and analysis about the experiences of women in charrería show the pervasive negotiation of needs that they engage as practicing in an Escaramuza Charra. Inside this study, it is introduced the term Sisterhood Paradox, used to describe the struggle that represents the Escaramuza’s constant collective performance, in comparison to charros, but that paradoxically serves a tool of resistance of charra women inside this patriarchal institution. In this piece of work, it is also argued that women in charrería, in many cases, are not aware of the subordinate position they occupy and in an unconscious way function as agents …

Understanding The Importance Of Psychological Screenings For Patients Undergoing Elective, Invasive Cosmetic Surgery: A Literature Review, Jazmin N. Rush

Theses and Dissertations

All over the United States (U.S.), men and women alike are undergoing elective, invasive cosmetic surgery. Research has found there is an increasing number of patients choosing cosmetic surgery in hopes of alleviating psychological disorders such as body dysmorphic disorder and low self-esteem. The objective of this review is to analyze the literature available regarding cosmetic surgery and the psychological issues leading to the decision to undergo elective, invasive cosmetic surgery in order to understand and identify the possible benefits of psychological screenings. Information for this study was obtained from three electronic databases - Galileo, PubMed, and CINAHL. U.S. based …

Navigating The Glass Ladder: A Qualitative Exploration Of The Challenges Women Leaders Experience Throughout The Process Of Promotion In The Manufacturing Industry, Jamie Birdwell

Theses and Dissertations

As the presence of women in the workplace continues to increase and significant strides have been undertaken to ensure fair and equitable treatment of women in industry, a considerable gap remains in the representation of women in leadership roles in male-dominated industries (Saraçoğlu, Memiş, Voyvoda, & Kızılırmak, 2018). Gender discrimination brought on by stereotypical gender beliefs regarding “men’s work” versus “women’s work” is pervasive in the male-dominated industry of manufacturing (Levine, 2009; Massey, 2014; Sweida & Reichard, 2013). This study explored the experiences of women as they navigated promotion in the manufacturing sector. Through the lens of role congruity theory, …

Toward The Development Of A Practitioner-Friendly Delay Tolerance Assessment And Treatment For Typically-Developing Children, Kaitlynn Mary Gokey

Theses and Dissertations

Delay discounting is the decrease in the value of a reinforcer as a function of the delay to the delivery of the reinforcer. Individuals who exhibit steep delay discounting are commonly referred to as ‘impulsive’ and are at a greater risk of behavior problems such as poor academic performance, addiction, and excessive risk-taking. One effective intervention is a concurrent activity, in which the individual must complete a task demand during the waiting period. Rules and rulegoverned behavior also play a critical role in improving delay discounting rates across populations, and may be used as an intervention to promote self-controlled responses. …

Microgravity Emergency Medical Containment System – A Concept Of Architecture, Prototyping, And Usability Research, Keith Elliott Crisman

Theses and Dissertations

Exploration is intrinsic to human nature but is well understood to be accompanied by inherent risks to the explorer. This is particularly evident in the exploration of extreme environments such as long-duration space habitation; in which risk is increased due in particular to the distance from assistance, services, and replenishment of consumables. One of the major risks to extreme environment survivability is lack of access to emergency medical care. This risk is further amplified in the microgravity environment where terrestrial non-life-threatening conditions can become life threatening due to lack of next-level-care capabilities. The question posed within this research asks, ‘What …

Symbiosis And Immunity At The Tri-Kingdom Interface, Stephen Alexander Lazar

Theses and Dissertations

The rise in global sea-surface temperatures drastically and adversely impacts coral reefs worldwide through coral bleaching, diseases, and subsequent coral mortality. Corals become bleached by the expulsion of endo-symbiotic dinoflagellates, which reduces host pigmentation. Coral bleaching can also lead to enhanced disease prevalence immediately after thermal-stress and during the associated re-uptake of symbiotic dinoflagellates. This aspect has yet to be thoroughly investigated. A model system is necessary to study the relationships between symbiosis and disease that has sufficient flexibility to include a variety of host symbionts as well as pathogens. For this dissertation project, Exaiptasia pallida was investigated as a …