Digital Commons Network^™

Solution Of Pdes For First-Order Photobleaching Kinetics Using Krylov Subspace Spectral Methods, Somayyeh Sheikholeslami

Dissertations

We solve the first order reaction-diffusion equations which describe binding-diffusion kinetics using a photobleaching scanning profile of a confocal laser scanning microscope approximated by a Gaussian laser profile. We show how to solve these equations with prebleach steady-state initial conditions using a time-domain method known as a Krylov Subspace Spectral (KSS) method. KSS methods are explicit methods for solving time- dependent variable-coefficient partial differential equations (PDEs). KSS methods are advantageous compared to other methods because of their stability and their superior scalability. These advantages are obtained by applying Gaussian quadrature rules in the spectral domain developed by Golub and Meurant. …

The Effect Of Instructional Strategies On Math Anxiety And Achievement: A Mixed Methods Study Of Preservice Elementary Teachers, Janelle K. Lorenzen

Dissertations

This study addressed how different instructional strategies affected preservice elementary teachers’ levels of math anxiety and their achievement in a math content course while considering descriptions of their experiences in the course in relation to their math anxiety and achievement. The instructional strategies used were traditional teaching methods and inquiry-based learning (IBL). A mixed methods embedded design was used in which the major design of the study is a nonequivalent control group design, where the collection of data occurred before, during, and after the intervention. There were 103 participants who were elementary education preservice teachers with 58 of them being …

The Effects Of Interrelated Goals, Anxiety, And Mindfulness On Somatic Symptoms, Liesel Christoe-Frazier

Dissertations

The present study investigated the interrelationships between interrelated goals, anxiety, somatic symptoms, and mindfulness among a sample of undergraduate college students (n = 454). Structural equation modeling was used to develop a well-fitting model based on collected data. Results showed that goal conflict was positively associated with higher levels of anxiety and somatic symptoms. Anxiety was found to mediate the relationship between goal conflict and somatic symptoms. Goal facilitation was found to be unrelated to anxiety and somatic symptoms. Mindfulness was not found to moderate the relationship between anxiety and somatic symptoms, but was found to be negatively related to …

"Love Is Gender Blind": The Lived Experiences Of Transgender Couples Who Navigate One Partner's Gender Transition, Barry Lynn Motter

Dissertations

This study investigated the experiences of romantic couples who maintained their relationship when one partner transitioned gender. For this phenomenology, 13 couples were interviewed as a dyad and individually from within systemic, feminist, and queer research theories. Couples were interviewed together to best encapsulate their couple narrative and honor their experiences. Themes that emerged from the interviews appeared overall consistent with research regarding transgender couple experiences. Couples discussed how much they loved each other and cared about their relationship above and beyond a partner’s gender identity, sharing they felt committed to their partners as people. Several common relationship changes were …

The Effects Of Self-Compassion And Shame On The Relationship Between Perfectionism And Depression, Julie Ann Barritt

Dissertations

The following study examined how self-compassion and shame effect the relationship between adaptive/maladaptive perfectionism and depression. Hierarchical multiple regression was used to examine the predictive role of adaptive/maladaptive perfectionism, shame, and self-compassion on depression. This study included a sample size of 226 undergraduate and graduate students from a university in the Rocky Mountain region. Results from the multiple regression analysis found maladaptive perfectionism was a significant predictor of depression (β = .540, p < .01), which supported findings from previous research. When shame and self-compassion were included, results indicated self-compassion (β = -.257, p < .01) and shame (β = .382, p < .01) were full mediators in the relationship between maladaptive perfectionism (β = .035, p = .707) and depression. The change in significance for maladaptive perfectionism from β = .540 to β = .035 was statistically significant (p < .01) showing important mediating effects of self-compassion and shame. Interestingly, adaptive perfectionism was found to act as a suppressor variable in this study; which provided important theoretical and methodological implications for future research. Overall, results emphasized the importance of targeting decreasing shame and increasing self-compassion for those with depression and maladaptive perfectionistic behaviors and beliefs.

Potential Environmental Impacts Of Oil And Natural Gas Production On A Shortgrass Steppe, Randi Corrine Lupardus

Dissertations

Federal lands of the Arapaho and Roosevelt National Forests and Pawnee National Grassland (PNG) lie on the Niobrara play and bring high profits to the State of Colorado. Natural gas development, production, and associated processing activities; however, can be a substantial source of air pollution. Common fugitive emissions on typical PNG Oil and Natural Gas (O&NG) production sites include volatile organic chemicals (VOCs), such as benzene, toluene, ethylbenzene and the xylenes (BTEX). These VOCs can then deposit (wet or dry) onto or transfer (via soil or water) into surrounding vegetation. Minerals, including heavy metals, are also released during the production …

Lived Experience Of College Students Who Reduced Their Alcohol Consumption, Devin L. Jordan

Dissertations

Research has indicated that college students who experience alcohol-related problems may reduce their alcohol consumption without treatment (Alexander & Bowen, 2004; Barnett, Goldstein, Murphy, Colby, & Monti, 2006; Blume, Marlatt, & Schmaling, 2000; McNally & Palfai, 2001). However, the literature regarding their overall experience before, during, and after this self-initiated change process is limited. This qualitative study investigated the lived experience of eight college students between the ages of 18 and 25 who reduced their alcohol consumption for a period of at least 30 days after experiencing alcohol-related problems. Participants had never met the diagnostic criteria for a “severe” substance …

Effects Of Historical Story Telling On Student Understanding Of Nos And Mendelian Genetics, Cody Tyler Williams

Dissertations

Science education researchers have long advocated the central role of the nature of science (NOS) for our understanding of scientific literacy. NOS is often interpreted narrowly to refer to a host of epistemological claims associated with the process of science and the limitations of scientific knowledge. Despite its importance, practitioners and researchers alike acknowledge that students have difficulty learning NOS and that this in part reflects how difficult it is to teach. Many teachers are uncomfortable with taking time away from traditional science content instruction. One promising method for teaching NOS and science content involves an explicit and reflective approach …

Fluid Manipulations Using A Piezo Electric Transformer For Sensing And Spray Generation Applications, Zeinab Ramshani

Dissertations

A steady effort has been made on the development of fluid manipulation techniques for sensing and actuating systems. Conventional techniques of fluid manipulation for sensing and spray generation purposes, often need trained staff or high input power and they are complicated, time consuming and expensive. Therefore, it is necessary to develop new systems which can overcome these drawbacks.

In this dissertation, the author has developed piezoelectric-based systems for fluid manipulation. The focus of this dissertation involves novel approaches of enhancing the sensing and actuating systems using the piezoelectric devices. This includes designing a system, which theoretically can overcome the limitations …

Sex Differences In Serotonergic And Dopaminergic Mediation Of Lsd Discrimination In Rats, Keli A. Herr

Dissertations

After decades of opposition, a resurgence of interest in the psychotherapeutic potential of LSD is gaining acceptance in the medical community. Future acceptance of LSD as a psychotherapeutic adjuvant may be predicated on knowledge about its neural mechanisms of action. Preclinical drug discrimination assay offers an invaluable model to determine the neural mechanisms underlying LSD’s interoceptive stimulus effects. Unfortunately, current preclinical literature on LSD discrimination is based on results obtained exclusively in male subjects. The present study represents the first known preclinical assessment of possible sex differences in the discriminative stimulus effects of LSD.

Adult female (n=8) and male (n=8) …

Elucidating Mechanisms Of Protein Aggregation In Alzheimer’S Disease Using Antibody-Based Strategies., Benjamin A. Colvin

Dissertations

Alzheimer’s Disease (AD) is a devastating neurodegenerative disorder. There are two characteristic histopathological hallmarks in the brain: senile plaques and neurofibrillary tangles, composed of insoluble aggregates of the amyloids Amyloid-β (Aβ) and tau protein, respectively. These diagnostic markers, though distinctive, are not apparent effectors of AD pathology. Evidence has mounted suggesting smaller soluble aggregates (oligomers) of Aβ or tau are the true drivers of disease progression. This dissertation presents several amyloid biophysics projects. Aggregate biophysical parameters such as weight, shape, and conformation were measured using a range of methodologies, including Multiangle Light Scattering, Dynamic Light Scattering, UV-Circular Dichroism, UV-Fluorescence, Scanning …

Teachers’ Perceptions Of Educational Games That Keep Score Of Cooperative Performances, Theodore Alden Wohlfarth

Dissertations

The scoring systems used in traditional sports and games are founded on the zero-sum premise that players are on opposite sides and one side can win only if the other side loses. These scoring systems may be effective at nurturing zero-sum mindsets and providing data for assessing performance in win-lose relationships. If so, games that use different scoring systems can be used to facilitate the development of collaborative mindsets, nurture win-win skills between diverse groups, and enable objective self-assessment of performances in non-zero-sum events when engaging with those on “other sides.” Although economic game theory has rich reservoirs of research …

Age Appropriate Treatment Of Drug-Resistant Tuberculosis In South Africa, Brittney Jayne Sullivan

Dissertations

The purpose of this study was to describe the time from DR-TB diagnosis to treatment initiation for people in South Africa with DR-TB with and without HIV and to evaluate the influence of age on the timing of treatment initiation after controlling for patient and health system characteristics. It was hypothesized that younger patients would have a greater number of days from DR-TB diagnosis to DR-TB treatment initiation. Additionally, we address the knowledge gaps pertaining to prescription of guideline-based treatment for DR-TB at treatment initiation and the influence of individual and health system factors on prescribed treatment for youth and …

Women’S Sexual Initiation: The Impact Of Gender Roles And Relationship Type, Sara Gonzalez-Rivas

Dissertations

Sexual script theory is the theoretical foundation for understanding how sexual interactions are navigated, including sexual initiation. Sexual initiation occurs when an individual conveys interest in sexual activity when sexual behaviors are not yet in progress. Past research has demonstrated that women initiate sex less frequently than men in other-sex relationships, perhaps due to traditional sexual scripts. The current research literature lacks data on sexual initiation among women in same-sex relationships. This study investigated the impact of perceived gender roles on women’s sexual initiation, the role of partner sex on women’s initiation behaviors, if perceived gender roles account for initiation …

The Lived Experience In Relation To The Educational Needs Of Nurses Caring For Induced Hypothermia Patients, Marie Hankinson

Dissertations

Ongoing educational development is essential to ensure the effectiveness of professional nurses' learning experiences. Understanding the ways in which workplace learning occurs is fundamental to enabling nurse educators to deliver that knowledge. Induced hypothermia was introduced as a new treatment modality in 2005 and education surrounding the care of the hypothermia patient is lacking in the literature.

The purpose of this study is to illuminate how nurses learn new knowledge in the clinical setting. Theoretical Framework: The learning theory chosen for this study is the three dimensions of learning by Illeris (2004).

The Effect Of A School Nurse Led Education Intervention On Blood Pressure And Physical Activity Levels In Adolescents, Nancyruth Leibold

Dissertations

Regular physical activity (PA) is a necessary health promotion behavior for adolescents. Benefits of regular physical activity are optimal body weight, lowering blood pressure (BP), and decreasing risk factors for chronic illnesses. Yet declining physical activity levels and increasing sedentary behaviors along with the rising prevalence of overweight and obesity, type 2 diabetes, and hypertension exists in teenagers. The purpose of this quantitative research was to study the effects of a School Nurse led teaching intervention to promote physical activity as a healthy behavior on blood pressures and physical activity levels in adolescents. Youth empowerment was the theoretical framework for …

Study On The Dispersion Of Particles At A Fluid-Liquid Interface And Its Application In Hydrophilous Pollination, Naga Aditya Musunuri

Dissertations

This dissertation work describes the physics of particle adsorption and the spontaneous dispersion of powders that occurs when they come in contact with a fluid-liquid interface and its application in hydrophilous pollination of Ruppia Maritima, an aquatic plant. The dispersion of particles can occur so quickly that it appears explosive, especially for small particles on the surface of mobile liquids like water. PIV (Particle Image Velocimetry) measurements show that the adsorption of a spherical particle at the interface causes an axisymmetric streaming flow about the vertical line passing through the particle center. The fluid directly below the particle rises upward, …

Efficient Coarse-Grained Brownian Dynamics Simulations For Dna And Lipid Bilayer Membrane With Hydrodynamic Interactions, Szu-Pei Fu

Dissertations

The coarse-grained molecular dynamics (CGMD) or Brownian dynamics (BD) simulation is a particle-based approach that has been applied to a wide range of biological problems that involve interactions with surrounding fluid molecules or the so-called hydrodynamic interactions (HIs). From simple biological systems such as a single DNA macromolecule to large and complicated systems, for instances, vesicles and red blood cells (RBCs), the numerical results have shown outstanding agreements with experiments and continuum modeling by adopting Stokesian dynamics and explicit solvent model. Finally, when combined with fast algorithms such as the fast multipole method (FMM) which has nearly optimal complexity in …

Fast Estimation Model Of Pressure-Temperature Response For Planning Focused Ultrasound Surgery, Tariq Mohammad Arif

Dissertations

High Intensity Focused Ultrasound (HIFU) is becoming a widely accepted modality for extracorporeal non-invasive hyperthermia and surgical procedures. Since ultrasonic transducers need to operate in various challenging body locations, the arrangement of their array elements can be optimized to improve the capability of controlling focus intensity. In the first part of this dissertation, patterns of pressure field variations with several selected design variables (kerf, transducer element’s number and element’s width-height) are studied. These patterns indicate that there is a more suitable shape and arrangement of transducer elements in a specified area to achieve highest possible pressure. In order to obtain …

A Case Study Of Hanban’S Chinese Language Teaching Program At Western Kentucky University: Developmental History And Preliminary Outcomes, Sheng-Huei Yu

Dissertations

This case study provides a historical overview of foreign language development (especially Chinese) in the United States and the growing number of Confucius Institutes (CIs) established in the U.S through Hanban, China’s National Office for Teaching Chinese as a Foreign Language. This case study specifically captures the growth of the Western Kentucky University (WKU) CI from its inception in 2010. According to Hanban’s annual assessment reporting guidelines, since the conception of CIs sheer quantity of teachers and students has always been the primary focus. Therefore, the growth in the numbers of Hanban Chinese teachers and number of students enrolled in …

Working On What Works (Woww) : Classroom-Level Impact On Teacher And Student Outcomes, Laura B. Wallace

Dissertations

The Working on What Works (WOWW) school-based intervention applies solution-focused theory and techniques to improve learning at the classroom level. This study evaluated WOWW's impact on student and teacher outcomes. Thirty classrooms were randomly assigned to treatment and control conditions, then compared on teacher-completed measures. Students who received WOWW experienced lower levels of internalizing and externalizing behaviors, including lower anxiety (p=0.000), sense of irrelevance (p=0.002), inattention (p=0.049), hyperactivity (p=0.044), impulsivity (p=0.044), and need for behavior correction (p=0.000). Overall externalizing behavior was also lower in students who had received WOWW (p=0.018). However, students in the treatment condition also scored lower on …

Motivation To Persist: The Role Of Hope, Academic Self-Efficacy, And Sense Of Belonging On First Generation Latinx College Students And Their Intent To Persist, Deanna Peck

Dissertations

The landscape of higher education is changing. More diverse students are attending universities at higher numbers, yet these students are not graduating. This quantitative study uses linear regression, stepwise regression, and then exploratory factor analysis to examine three constructs - hope, academic self-efficacy, and sense of belonging - in first generation Latinx college students to see if these constructs made a difference in their intent to persist. While these constructs were positively statistically significant, their effect sizes were weak and do not explain the all the reasons why first generation Latinx college students intend to persist to graduation. In addition, …

The African American/Black Racial Tapestry: Black Adolescents' Private, Independent School Experiences And Racial Identity Development, Angela R. Birts

Dissertations

While private, independent schools are homes to students of diverse racial and ethnic backgrounds, the subjective experiences of African American students within these spaces are distinct. Twelve African American high school students attending ten different private, independent schools were asked to describe their racial and ethnic backgrounds, and explain how race is manifested in their schooling experiences. A methodological bricolage, including ground theory methods, is intricately woven into the fabric of this study to reflect the rich tapestry of African American/Black youth identities and their experiences in independent schools that underscore youth’s interpretation of contemporary black culture and my personal …

Academic Supports Preferred By Academically Struggling African American Students At A Predominantly White University, Ellen E. Meadows, Joan H. Ruppert

Dissertations

Academic supports offered by Predominately White Institutions (PWIs) meet the needs of individuals who achieve standards such as high grade point averages and high standardized test scores, and who can negotiate traditional college institutions. Evidence indicates that retention and graduation rates for underrepresented minority students may be lower in comparison to White peers at the same institutions. Observations indicated that academic supports offered by a Midwestern PWI, may not provide the services preferred by African American students who struggle academically in two colleges, the College of Education and the College of Nursing.

A mixed-methods design was used to determine what …

A Functional Algorithm For Weight Loss And Obesity Practice: Guide For Clinical Decision-Making For Treating Women, Jennifer A. Tice Williams

Dissertations

ABSTRACT

Background

Overweight and obesity have significant impact and consequences on women leading to reduced quality of life, comorbid conditions and premature mortality. Many healthcare providers lack adequate training and the time to properly treat overweight and obesity. Algorithms have been shown to improve clinical knowledge and save time.

Objectives

To develop an algorithm for weight loss assessment and treatment to aid in the clinical decision-making process while improving the quality of care for overweight and obese clients in an efficient manner that can be replicated.

Methods

After an extensive literature review to identify best-practice guidelines for weight loss a …

A Video Intervention For Professionals Working With Transgender And Gender Nonconforming Older Adults, Allison R. Warren

Dissertations

Abstract

There is consensus that providers who work with transgender and gender nonconforming (TGNC) older adults should use the language preferred by the older adult; however, self-efficacy in this particular context is unexplored. The current study compared the efficacy of three online interventions for aging-focused professionals designed to increase knowledge of TGNC-related terminology, decrease self-reported negative attitudes towards TGNC individuals, and increase self-efficacy for affirmative interactions. Employees and volunteers of area agencies on aging across the United States (N = 155) were randomly assigned to one of three interventions: written educational information, a video demonstration, or both the written educational …

Neuroimaging And Cognitive Outcomes In Adults With Human Immunodeficiency Virus And Early Life Stress, Laurie M. Baker

Dissertations

Brain abnormalities persist in individuals with human immunodeficiency virus (HIV) despite the use of highly active antiretroviral therapy (HAART). To date, limited work has focused on the association between early life stress (ELS) and brain integrity in individuals with HIV, although ELS is highly prevalent in this population. The present study was conducted to determine whether ELS corresponds to the expression of persistent HIV–related neuroimaging abnormalities and cognitive dysfunction. A total of 130 HIV+ individuals on HAART and 76 HIV– individuals underwent 3T structural magnetic resonance imaging, diffusion tensor imaging, and neuropsychological assessment. Individuals were free of major psychiatric illness …

The Effects Of Religiosity On Parent-Adolescent Communication About Sex And Sexuality : A Multiple Regression, Marlon C. Robinson

Dissertations

Most studies on parental religiosity have focused on specific adolescent sexual behaviors (i.e. sexual initiation), family cohesion, greater supervision, and higher moral expectation while parent-adolescent communication about sexual matters remains understudied. The purpose of this study was to examine the relative influence of parent variables such as relation, education level, communication style (degree of openness, extent of problems), and religiosity (public, private) on sex communication and the age at which parents began conversations about sexual matters. A sample of 170 parents and caregivers from the Continental United States who had at least one adolescent 13-18 years old completed questions on …

An Investigation Of Turkish Middle School Science Teachers’ Pedagogical Orientations Towards Direct And Inquiry Instructional Approaches, Selcuk Sahingoz

Dissertations

One of the most important goals of science education is preparing effective science teachers which includes the development of a science pedagogical orientation. Helping in-service science teachers improve their orientations toward science teaching begins with identifying their current orientations. While there are many aspects of an effective science teaching orientation, this study specifically focuses on effective pedagogy. The interest of this study is to clarify pedagogical orientations of middle school science teachers in Turkey toward the teaching of science conceptual knowledge. It focuses on what instructional preferences Turkish middle school science teachers have in theory and practice.

The purpose of …

Chemotypic Variation Of Biogenic Volatile Organic Compounds In Midwest Forest And Atmospheric Role Of Peroxyacyl Nitrates In Southeastern U.S., Shino Toma

Dissertations

Biogenic volatile organic compounds (VOC), including isoprene and terpenes, impact atmospheric processes such as production of tropospheric ozone, formation and growth of secondary organic aerosol (SOA), global climate change, and human health. Although estimated emission rates of total biogenic VOC exceed anthropogenic emissions, there are many challenges to direct measurements because they are very reactive with atmospheric oxidants and some are still difficult to detect by current analytical techniques. Therefore, high uncertainties lead to discrepancies between individual and total biogenic VOC budget with atmospheric oxidants and an underestimation of SOA formation.

White pine (Pinus strobus) was once a dominant species …