Digital Commons Network^™

Residual Strength Estimation Of Degraded Bonded Joints Based On Non-Destructive Evaluations, Guilherme Garcia Momm

Theses and Dissertations

Pioneer designers acknowledged structural bonding advantages over other joining methods, sparking many aerospace applications. Nonetheless, durability issues, weak bonds, and the inability to non-destructively interrogate bond quality after-the-fact hindered widespread bonding use. These challenges also contributed to several aircraft accidents, fostering extensive related research. Firstly, we examined the bonding operational history in aviation. The challenge to simulate or experimentally reproduce bonded joints’ long-term behavior under real-life conditions magnifies the value of in-service data. Since 1944 the International Civil Aviation Organization has recommended investigating aircraft incidents/accidents. Among numerous investigation reports publicly available, we identified 73 bond-related occurrences involving type-certified aircraft registered …

Construction And Testing Of Large-Area Gem Detectors For The Forward Muon Endcap Upgrade Of The Cms Experiment And Vector-Portal Search For Dark Matter Particles With Dimuon Pairs At √S = 13 Tev, Mehdi Rahmani

Theses and Dissertations

In this thesis, I present my contributions to the second major upgrade of the Compact Muon Solenoid at the Large Hadron Collider and the analysis that I performed on the data collected by the Compact Muon Solenoid during the 2018 and 2017 era. Alongside my team, I assembled and tested ten Gaseous Electron Multipliers to upgrade the forward region at the Compact Muon Solenoid, all of which are now installed at the dedicated stations. The campaign for producing these detectors succeeded in a twoyear-long prototyping endeavor, where I examined the procedural steps for production to optimize the production and testing …

A Spatiotemporal Bayesian Model For Population Analysis, Mohamed Jaber

Theses and Dissertations

Spatiotemporal population analysis based on incomplete, redundant, and unidentified observations is critically important, yet it is a very challenging problem. Different approaches have been proposed and several methods have been implemented to address this problem. Capture-recapture methods have been widely used and have become the standard sampling and analytical framework for ecological statistics with applications to population analysis. Despite the fact that capture-recapture methods have been commonly used, these methods do not consider the spatial structure of the population. Moreover, conventional capturerecapture methods do not use any explicit spatial information with regard to the spatial nature of the sampling and …

Quantifying Responsiveness In The Vaccine Industry To Evaluate And Improve Pandemic Response, Connor Hill

Theses and Dissertations

In the wake of the pandemic Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) we can look at many aspects of the global response, including social, scientific, and governmental. Current research in the areas of vaccine development and manufacturing find the process of developing a new vaccine takes an especially long time and is unresponsive. Understanding the factors that influence responsiveness can help organizations be better prepared to address the needs of society should another pandemic strike. Responsiveness can be linked to product, process, and volume. The vaccine development and manufacturing process historically takes years to reach distribution for public use. …

Factors Influencing Students’ Achievement In Scientific Literacy: A Secondary Analysis Of Pisa 2018 Data From Saudi Arabia, Manal Dhaifallah Alkhudaydi

Theses and Dissertations

The Kingdom of Saudi Arabia joined PISA for the first time in 2018, and 6,136 of the students in 235 schools participated. The purpose of this multi-level study was to examine the influence of selected student- and school-level factors on students’ scientific literacy using data that were gathered as part of the 2018 PISA assessment. The sample of this study was obtained from the OECD’s PISA 2018 International Database. In this study, the focus was on the relationship between selected factors measured in PISA school and student surveys and students’ scientific literacy, as measured by the Science section of the …

Dirichlet Type Boundary Value Problems For Linear And Quasi{Linear Hyperbolic Equations Of Higher Order, Reemah Alhuzally

Theses and Dissertations

Dirichlet type problems for quasi-linear hyperbolic equations are considered. For two-dimensional boundary value problems there are established:

(i) Unimprovable sufficient conditions of unique solvability and well-posedness of linear problems in piecewise smooth domains;

(ii) Unimprovable Sufficient conditions of unique solvability of linear problems in smooth convex domains.

(iii) Optimal Sufficient conditions of solvability, unique solvability and strong well-posedness of quasi-linear problems in piecewise smooth domains;

(iv) Optimal sufficient conditions of solvability and unique solvability of quasi- linear problems in smooth convex domains.

For three-dimensional linear boundary value problems there are established:

(i) Unimprovable sufficient conditions of unique solvability and well-posedness …

Railcar Wheel Impact Detection Utilizing Vibration-Based Wireless Onboard Condition Monitoring Modules, Marco A. Barrera

Theses and Dissertations

The current limitations in established rail transport condition monitoring methods have motivated the UTCRS railway research team at UTRGV to investigate a novel solution that can address these deficiencies through wired, onboard, and vibration-based analytics. Due to the emergence of the Internet of Things (IoT), the research team has now transitioned into developing wireless modules that take advantage of the rapid data processing and wireless communication features these systems possess. This has enabled UTCRS to partner with Hum Industrial Technology, Inc. to assist them in the development of their “Boomerang” wireless condition monitoring system. Designed to revolutionize the way the …

Removal Of Arsenic (Iii) And Arsenic (V) From Aqueous Solution Via Common Sunflower Helianthus Annuus By Phytoremediation, Irving A. Vazquez Hurtado

Theses and Dissertations

Phytoremediation provides a cost-effective, non-invasive technique to remove contaminants from the soil and groundwater. Sunflowers are fast growing and have a showed effective at removing various pollutants from soil, including lead and other heavy metals. Health issues related to arsenic are mainly attributed to exposure of arsenite, whereas arsenate is much less toxic. The common sunflower Helianthus annuus was the species used to remove both arsenic (III) and As(V) ions from hydroponics solutions. In the present study sunflower seeds were germinated for a week, placed under the sun for a day and subsequently placed in a nutrient solution to aid …

Career And Technical Education Teacher Self-Efficacy Of Staff Development As Part Of A Beginning Teacher Induction Program: A Qualitative Research Of Cte Teacher Externs Of A South Texas School District…From The Classroom To The Job Site, And Back Again, Raul Alvarez Jr.

Theses and Dissertations

Career and Technical Education (CTE) has proven itself through substantial research, to provide a positive impact on the U.S. economy and the job market in its college and career preparedness of high school students. However, the ability of school districts in retaining competent CTE teachers is not as reassuring. The progressive years for any beginning CTE teacher are during their initial tenure in the profession. Teacher self-knowledge is also developed during these years inclusive of the occupational reflection of either removing oneself from or continuing as a teacher. Therefore, it can be stated that it is during this period when …

Forecasting Salinity In The Laguna Madre Using Deep Learning, Martin J. Flores Jr.

Theses and Dissertations

Salinity is an important metric in the Laguna Madre for establishing the long term health of the local ecological population. By utilizing Deep Learning (DL) techniques, the predicted and forecasted salinity in the Laguna Madre is generated from data provided by the Moderate Resolution Imaging Spectroradiometer (MODIS)-Aqua satellite.

Currently, only one other DL model has been used to forecast Sea Surface Salinity (SSS), being a Recurrent Neural Network (RNN). However, the RNN model requires the prediction of a full area of salinity to function.

As such, several model architectures were tested, with the best one, being a Multi-input MPNN, utilized …

Assessing The Effects Of Levonorgestrel (Lng) On Neural Differentiation In The Developing Hypothalamus Using The Zebrafish (Danio Rerio) As A Model, Gabriella Hinojosa

Theses and Dissertations

Neurogenesis is a critical component of fetal neurodevelopment consisting of: migration, proliferation and differentiation. Health concerns from anxiety to reproductive issues have been linked to alterations of neurogenesis processes. Endocrine disrupting chemicals (EDCs) can mimic hormones vital to this process, potentially adversely affecting the susceptible fetal brain. One EDC, Levonorgestrel (LNG), is a testosterone-like progestin used in birth control methods that has a high bioavailability and long half-life. Using zebrafish embryos as a model, this lab previously discovered that an environmentally relevant LNG dose (5 ng/L) significantly increased anxiety behaviors. The hypothalamus is responsible for the development …

Corrido Of A Returning Angel: A Collection Of Stories, Ricardo Marez Jr.

Theses and Dissertations

As a Chicano (Mexican-American), person of color with a lower-middle class, American, South Texas upbringing, the world of authors and literature has always felt out of reach and not particularly inviting towards people like me—let alone representative or celebratory. In spite of this, or perhaps owing to it, I have decided to shoot my literary shot, unremittently holding onto my unique voice and unconventional styles in this first collection of short stories. I discuss in depth my inspirations and role models in writing, including Henry Miller and Whitman, with discussion of literary style and genre that include: surrealism, absurdism, allegory, …

Comparing Various Physiological System Adaptations Following 8 Weeks Of Resistance Training With Or Without Bfr In Older Males, Ricardo Parra

Theses and Dissertations

PURPOSE: The purpose of this study was to compare the effects of 8 weeks of resistance exercise training with and without BFR on: 1), arterial elasticity and hemodynamics (e.g., blood pressure and resting heart rate), 2) muscular force production (e.g., maximal voluntary contraction, force production, electromyography, and estimated one-repetition maximum) in males between the 50 to 70 years of age.

RESULTS: Significant condition difference for reflection magnitude occurred in BFR group (p < 0.05). Significant time*condition effect occurred in Leg Press 1RM, Leg Extension 1RM, Leg Curl 1RM, Chest Press 1RM, and Shoulder Press 1RM (p < 0.05). Significant condition* time interaction occurred for Isokinetic Leg Extension Test (60°/s) (p < 0.05). A significant time*condition interaction occurred during Maximal Voluntary Contraction (MVC) – Root Mean Square for both vastus medialis and vastus lateralis (p < 0.05). A significant time main effect occurred in the BFR group for the amplitude mean of the MVC in the vastus medialis and vastus lateralis (p < 0.05). A significant time main effect occurred for median frequency of the MVC (p < 0.05). A significant difference in Estimated Visceral Adipose Tissue occurred in the BFR group (p < 0.05). A significant condition*time interaction occurred in arm fat percentage (p < 0.05). The BFR group had significantly less fat tissue (%) in the left arm (p < 0.01) and in the right arm (p = 0.04). A significant time*main effect occurred in the total lean tissue for the left side of the body (p = 0.04).

CONCLUSION: Using BFR resistance training at a low intensity can achieve similar adaptations seen at high intensities while reducing the risk of injury that comes with heavier loads.

An Application Of Matrices To The Spread Of The Covid 19, Selena Suarez

Theses and Dissertations

We represented a restaurant seating arrangement using matrices by using 0 entry for someone without covid and 1 entry for someone with covid. Using the matrices we found the best seating arrangements to lessen the spread of covid. We also investigated if there was a factor needed to create a formula that could calculate the matrix that shows who would be affected with covid with each seating arrangement. However, there did not seem to be a clear pattern within the factors. Aside from covid applications, we also investigated the symmetries in seating arrangements and the possible combinations with these arrangements …

Mental Health In The Catcher In The Rye And Thirteen Reasons Why, Zugay Trevino

Theses and Dissertations

J.D. Salinger’s 1951 novel The Catcher in the Rye shows the life of seventeen-year-old Holden Caulfield and the aftermath of his expulsion from Pencey Prep. Jay Asher’s 2007 book Thirteen Reasons Why centers on seventeen-year-old Clay Jensen’s aftermath of his friend Hannah Baker’s death. Although both novels are written, published, and set decades apart, both have more in common than originally thought. Both books were originally heavily challenged or banned upon their initial release. Although they were challenged due to different reasons, both are better understood after analyzing mental health in the books. The books deal with unawareness of mental …

Real Memories For False Events: An Examination Of Individual Characteristics That Predict Flashbulb Memories For Real And Fictitious Mass Shootings, Richard Belz

Theses and Dissertations

Multiple studies have examined flashbulb memories (FBM) for various events, but few studies have evaluated these memories within the context of mass shootings. The current investigation examined adult participants’ FBMs for both real and fictitious mass shootings collected in an online survey of 607 participants in the United States. ANOVA, Chi-Square, and regression analyses were used to analyze survey data to examine participant characteristics associated with FBMs for these events. More than 40% of participants had one or more FBMs for real mass shootings. Of note, more than 20% of participants had one or more FBMs for shootings that never …

Age-Related Differences In Food-Specific Inhibitory Control: Electrophysiological And Behavioral Evidence In Healthy Aging, Whitney D. Allen

Theses and Dissertations

The number of older adults is estimated to double from 52 million to 95 million by 2060. Approximately 80-85% of older adults are diagnosed with a chronic health condition. Many of these chronic health conditions are influenced by diet and exercise, suggesting improved diet and eating behaviors could improve health-related outcomes. One factor that might improve dietary habits in older adults is food-related inhibitory control. We tested whether food-related inhibitory control, using behavioral (response time, error rate) and scalp-recorded event-related potential (ERP; N2 and P3 components) measures of food-related inhibitory control differed between younger and older adults over age 55. …

Nm-Rs Au Naturale: Investigations Into Simulating A Natural Environment, Jenna Pantophlet

Theses and Dissertations

Naked Mole-rats (NM-Rs) have been studied in laboratories for decades due to their unique behavior and physiology. However, due to the scope and complexity of the NM-R’s natural subterranean tunneling system, it has been difficult to replicate in the laboratory environment. From a researcher’s perspective, optimal housing is cost- and space-efficient and easily cleaned. On the other hand, optimal animal welfare and husbandry encourages the most biologically relevant enclosure to evoke the fullest range of an animal's behavioral repertoire. While there is an abundance of works centered on the biomedical potential of these odd rodents (Buffenstein et al, 2012; Delaney …

Parenthood Orientation Among Young Women: Is It Associated With Pregnancy Intention And Unprotected Intercourse?, Nakeisha Blades

Theses and Dissertations

This study explored relationships between parenthood orientation, pregnancy intention, and unprotected intercourse. Nulligravid, sexually active women aged 18-29 (N = 252) were surveyed on these topics in May 2019. There were significant differences in parenthood orientation by past and current pregnancy intention. Higher scores on parenthood orientation were associated with increased odds of past unprotected intercourse and expecting future unprotected intercourse. Only education and contraceptive self-efficacy retained significance in adjusted models. Study results are consistent with prior work on parenthood orientation and pregnancy intention and point to other factors as stronger correlates of contraceptive use.

Non-Verbal Pride Expressions As A Predictor Of Lgbtq Health, Craig Gilbert

Theses and Dissertations

Pride is a self-conscious, positive emotion that has been assessed in a wide range of populations and with a variety of pre-validated measures. Research has shown that the presence of pride can function as a potential resilience factor against minority based stress and has been linked to increased emotional well being, life satisfaction, and self-esteem. However, a majority of this research relies upon self-report questionnaires as opposed to observational data. To evaluate the predictive power of non-verbal pride behaviors, a group of LGBTQ+ individuals (n=125) were asked during a recorded interview to describe an experience where they felt prideful about …

A Scoping Review Of Dominant Trends Of Using Music To Teach Phonemic Awareness From 1995 - 2021, Brandy Walthall

Theses and Dissertations

With reading being such an essential part of education, teachers need resources to help with instructional strategies. This scoping review will gather information on one such resource in teaching reading. It focuses on a scoping review of the information available on teachers using music to teach phonemic awareness. The scoping review will investigate the trends from 1995-2021 in teachers using music to teach phonemic awareness, trends in instructional strategies and research methods for teachers using music to teach phonemic awareness, and assessing or looking at the outcomes of teachers using music to teach phonemic awareness. The researcher used keywords for …

The Intersection Of The Sexual Double Standard And Race: A Sexual Triple Standard, Christina Whitaker

Theses and Dissertations

The primary purpose of this research study is to continue to investigate the Slut Shaming Scale and determine if it continues to serve as a reliable and valid measure. The secondary purpose of this study is to continue to investigate the sexual double standard, specifically examining the differences between men and women’s experiences. Finally, the third goal of the study is to examine slut shaming perceptions of both men and women who are identified as either white or Black. Participants (n = 539) were recruited using Amazon Mechanical Turk or were recruited through a local Midwestern university. The researcher found …

Dating App Facilitated Sexual Assault: A Growing Phenomenon, Kristen Mella Hamblin

Theses and Dissertations

Dating App Facilitated Sexual Assault (DAppSA) is a new phenomenon and growing concern. Research on DAppSA is extremely limited. This study aimed to identify unique victim and assault characteristics associated with DAppSAs. A retrospective SAMFE chart review of patients (N = 3,413) from 2017 to 2020 was conducted. Sexual assault nurse examiners completed SAMFEs. Inclusion criteria for DAppSA cases included 1) victim was 14 years of age or older; 2) victim indicated they met the perpetrator on a dating website or app; 3) the SA occurred at the initial in-person meeting; 4) victim had a SAMFE with evidence collection. DAppSAs …

Frequency And Magnitude Of Obstacles And Helpful Behavior Items In End-Of-Life Care As Perceived By Nurses Working In Critical Access Hospitals, Shalyn C. Larsen

Theses and Dissertations

Background: Twenty percent of Americans live in rural areas where most of their healthcare is provided in Critical Access Hospitals (CAHs). It is unknown how frequently obstacle and helpful behavior items occur in End-of-Life (EOL) care in CAHs. Objectives: To determine the frequency of occurrence scores of obstacle and helpful behavior items in providing EOL care in CAHs. To also determine which obstacles and helpful behaviors have the greatest or least impact on EOL care based on the magnitude scores. Methods: A questionnaire was sent to nurses working in 39 CAHs in the United States. Nurse participants were asked to …

School-Level Administrator And Teacher Perceptions Of The Impact Of Teacher Evaluations On Classroom Instruction, Sabrina Stephens

Theses and Dissertations

Teacher evaluations have a substantial impact on student achievement. Students rely on their teachers to provide them with the necessary knowledge and skills to succeed in today’s ever- changing world. Teachers are required to meet the needs of every student and perform to the best of their ability. Administrators support and evaluate teachers to help them make important decisions about their instructional practices. The purpose of the current study explored teacher and administrator perceptions of teacher evaluation ratings and its impact on classroom instruction. The current study utilized the principle of personal mastery as it assessed the impact teacher evaluations …

Teachers’ Perceptions On Implementing Read 180 During The Covid-19 Pandemic For Grade 3-5 Students In A Georgia Public School, Monika Nicole Whitmire

Theses and Dissertations

The problem addressed by the study was to examine the effectiveness of the implementation of the Read 180 Universal reading intervention program for students who struggle with reading during the COVID-19 pandemic. The purpose of this case study was to describe teachers’ perceptions of the effectiveness of the implementation of the Read 180 program for elementary students in a grades 3-5 Georgia elementary school during the COVID-19 pandemic. A qualitative research paradigm has been used in the research described below.

A case study involved semi- structured interviews of 12 general ELA teachers in grades 3, 4, and 5. A thematic …

An Investigation Into The Experiences Of Secondary Social Studies Teachers Regarding A Change In State-Level Social Studies Standards In A Colorado School District, Lindsay Mcmichael Sitterley

Theses and Dissertations

The researcher investigated the perceptions of secondary social studies teachers regarding the change in state - level social studies standards, especially in terms of their response in instructional practice. Furthermore, the study included a discussion of the factors that influence the actions of teachers related to the change in the social studies curriculum. This allowed for an analysis of potential changes in instructional decision making, such as including cooperative learning strategies, that were the result of the change in curriculum. The study is significant as changes in recommended instructional strategies have occurred in recent years. Additionally, research in the field …

Using A Tracer Test To Assess The Fate And Transport Of Nitrate In A Saturated Buffer Zone, Alhassan Sahad Sahad

Theses and Dissertations

The Upper Mississippi Basin (UMB), which includes Illinois, has highly fertile soils and therefore, experiences intensive agricultural practices. While fertile, the soils do not drain well, resulting in the installation of tile-drainage systems. Agricultural practices within the UMB involves the application of nitrogen (N)-rich fertilizers. The tile systems coupled with the application of N fertilizers have led to the excessive export of nitrates as nitrogen (NO3-N) from the agricultural fields into surface and subsurface waters through subsurface tile drainage systems. Excess NO3-N contributes to eutrophication and to development of hypoxic zones in aquatic environments. One method that has exhibited success …

How Brazilians Used Media To Cope With The Issues Brought By The Covid-19 Pandemic, Vivian De Melo Campos

Theses and Dissertations

Due to the COVID-19 pandemic, the world faced lockdown and quarantine restrictions that encouraged or forced people to stay home. Along with the rest of the world, Brazil faced many difficulties during this period and it became one of the countries that lost more lives due to the Coronavirus infection worldwide. This study focuses on showing how people in Brazil coped with the challenges brought by the pandemic. It also focuses on showing if and how participants used media as a coping mechanism. The research was done through qualitative methods with semi-structured interviews with 25 adults who were living in …

Conceptualization Of Steam Education In The Elementary Classroom, Virginia Olmert Mccullough

Theses and Dissertations

Science, Technology, Engineering, Art, and Mathematics (STEAM) education is an instructional approach to education in which students demonstrate creative approaches in experiential, inquiry-based learning within the STEM disciplines. Despite the national focus on STEAM education, there exists considerable uncertainty as to what constitutes STEAM education and how classroom educators make sense of their conceptualization of STEAM in their classroom within the state of Georgia.

The method of conceptualization is the internal processing of thoughts that produce new ideas or knowledge. This descriptive case study offers thoughtful new insights on how educators in a STEAM-certified elementary school in a school district …