Digital Commons Network^™

Development Of A Discrete Element Model For Artificial Turf, Justin Rittenhouse

Dissertations

NFL data exhibits a distinct correlation between an elevated lower extremity injury rate and synthetic surfaces. These ubiquitous injuries frequently relate to excessive foot traction (i.e., failure to release causing fracture or soft tissue damage). Consequently, a discrete element model was developed using open-source software to analyze stud traction. First, laboratory data was collected via bench level experiments covering seventeen different testing scenarios. A minimum of twenty-five samples were collected per scenario. Total work, average torque, and maximum torque were used as indicators of stud grip. And the latter two were statistically analyzed for outliers and significant differences. Next, an …

From Doctoral Student To Professor: The Professional Socialization And Career Development Of International Counselor Educators, Ayla Martine Ludwig

Dissertations

Becoming a counselor educator is a complex and rigorous process wherein students grow both personally and professionally (Dollarhide et al., 2013). Throughout this process, students develop in accordance with doctoral competency standards (CACREP, 2021) which help socialize them into the role of professor. For international learners, their education has historically included unique challenges such as language barriers (Behl et al., 2017; Hegarty, 2014; Jang et al., 2014; McDowell et al., 2012; Ng, 2012; Pollock et al., 2017; Sato & Hodge, 2015; Sherry et al., 2010), cultural adjustment (Jang et al., 2014; Kuo et al., 2018; Woo et al., 2015), and …

Say Her Name: A Phenomenological Study On Black Women’S Experiences With Fearful Encounters With The Police, Marilyn Shantey Buford

Dissertations

Police violence is a historical, systemic issue that continues to plague the Black community to this day. Research discussing the systemic oppression of police violence on Black people has seen an increase over the past decade. However, little has been discussed on the effects of police violence on Black people’s health and wellness, particularly their mental health. The research that exists surrounding police violence and mental health is largely concentrated on the experiences of Black men. Little is known about how Black women personally experience police violence or how these experiences impact their mental, emotional, and physical health. Not exploring …

The Effects Of Combined Evaluative And Memo, Matrix, And Graphic Objective Feedback On Performance When Receiving Fixed Pay, Amber L. Derthick

Dissertations

The purpose of this current study was to examine the relative effectiveness of written feedback in the form of a memo that displays the performer’s current performance (memo feedback), written feedback in the form of a matrix that displays the performer’s current performance along with past performance (matrix feedback), and graphic feedback that displays the performer’s current performance along with past performance on a line graph (graphic feedback) when individuals receive fixed pay. The memo, matrix, and graphic feedback displayed “objective” feedback. Participants were 70 undergraduate students who were randomly assigned to one of the four conditions. Participants attended a …

An Examination Of Specific Learning Disability Identification Post Participation In The Michigan Department Of Education Transformation Zone, Erin E. Senkowski

Dissertations

The identification of students with specific learning disabilities has evolved since the reauthorization of the Individuals with Disabilities Education Improvement Act (IDEIA) in 2004. This reauthorization gave state agencies parameters that disallowed using the severe discrepancy model for identification as a stand-alone method. In response to this change, Michigan provided Intermediate and local school districts with further guidance that disallowed the use of the severe discrepancy model for identifying children with Specific Learning Disabilities (SLDs) and instead required Intermediate School Districts, on behalf of their local districts, to choose one of three models, including Patterns of Strengths and Weakness (PSW), …

A Case Study Of The Organizational System Of Articulation At A Midwestern Regional Public University, Katherine J. Giardello

Dissertations

Quantitative research has long shown lagging community college transfer student completion rates, in addition to excess credits earned and lengthened time-to-degree for transfer students that do earn a bachelor’s degree (Horn & Skomsvold, 2011; Jenkins & Fink, 2016; Simone, 2014; U.S. GAO, 2017). Scant qualitative studies exist related to student transfer, particularly the academic enterprise of articulation and the university perspective on transfer.

This qualitative study takes up the cause, using organizational and systems theories (Birnbaum, 1988; Clark, 1983; Cohen & March, 1974; Morgan, 2006; Senge, 1990; von Bertalanffy, 1972; Weick, 1976) to frame a single site case study with …

Principals Staying In Concentrated Poverty School Districts: Voices From Within, Mark Wilke

Dissertations

School principals are facing an increase in demand and challenges from district, state, and federal agencies for improvements both behaviorally and academically. Each year, more school principals exit their positions for other professions. The concentrated poverty school districts have been hit the hardest by this exodus.

The purpose of this basic qualitative study is to examine why some principals within concentrated poverty school districts remain in their positions, especially when they are located near other districts with much lower poverty concentrations. The factors of interest are issues such as district leadership support for principals, compensation, climate and culture of the …

Working Logic Parameter Types And Philosophical Assumptions Of Selected Evaluation Approaches—A Descriptive Qualitative Analysis, Thomas J. Lyzenga

Dissertations

The purpose of the study is to enhance the selection and use of selected contemporary evaluation approaches through the development of a descriptive profile that combines the parameters of their working logics and their philosophical assumptions. The profile provides a unique structure to understand, identify, select, and apply evaluation approaches. I catalogued 86 evaluation approaches described in 13 sources that discuss multiple evaluation approaches and applied citation analysis to identify the most used or most quickly growing approaches. For 11 of the commonly used evaluation approaches, I identified the seven features of the feature profiles through a qualitative content analysis …

Beneficial Effects Of Exercise On Glial Cell Line-Derived Neurotrophic Factor Content And Endplate Morphology In Skeletal Muscle Of Aging Male And Female Rats, Juliana M. Vangyseghem

Dissertations

Premenopausal women display lower incidence and severity of neurological disease compared to men of the same age, yet these populations are often treated similarly. A decline in neuromuscular function is associated with aging, which may be partially explained by a decline in neurotrophic factor expression with age. A possible way to maintain neuroprotection would be to regulate the production and release of a target-derived neurotrophic factor, such as glial cell line-derived neurotrophic factor (GDNF). GDNF has been shown to be the most potent survival factor for motor neurons and GDNF content of skeletal muscle has been shown to increase with …

Pathways To Leadership In A Professional Association, Cheryl Lynn Endres

Dissertations

This purpose of this exploratory qualitative study was to explore the experiences of former volunteer leaders who served in the role of president for a professional association. A qualitative design framed by phenomenology is appropriate when seeking to understand individual reflections on a common experience (Brinkmann, 2008, Patton, 2018, Creswell & Poth, 2018). The research was framed as exploratory due to the limited qualitative studies on leadership in professional associations, and more information to understand this experience can be gained by using the qualitative phenomenological method. The phenomenon of focus in this study is motivations related to volunteer leadership, in …

New Alternative Method Developed For The Measurement Of Active And Total Clay In Foundry Green Sands, Piao Jian Tan

Dissertations

Precise measurement of active clay content in molding sand is essential in the metal casting foundry to produce high quality end products with no defects. The historical methylene blue (MB) test was considered qualitative, subjective and prone to operator bias in regard to the reading of the halo. A new spectrophotometric or digital clay technique has been developed. The test utilizes the cation exchange capabilities of the Cu(II)-triethylenetetramine dye and the absorbance reading of the sequestered solution through a UV-Vis spectrophotometer. Working with multiple laboratories (Decher, MTI, EJ, and JD) on actual foundry green sand samples, the method was optimized …

Three Essays On Fertility Rates In China, Lichun Cai

Dissertations

China is currently facing the issue of low fertility rates. In three chapters, I discuss the reasons for the low fertility rate in China from three different microeconomics perspectives, by using econometric methods including machine learning tools.

Chapter One considers the effects of income on fertility rate. There is a widely accepted view that the improvement of the education level has led to a decline in fertility. I critique this view and propose a new perspective: the childbirth choice of a family member is not only related to the education level, but also to the differences in education level between …

Unlocking Potential: Analyzing The Impact Of Special Education Services On The Assessment Outcomes Of Students With Learning Disabilities, Kaitlyn Billops

Dissertations

Since the enactment of the Individuals with Disabilities Education Act (IDEA) in 2004, there has been a notable increase in the enrollment of students receiving special education services (National Center for Education Statistics [NCES], 2022). However, despite advancements in special education programming and service delivery, academic performance for students with disabilities still falls behind their general education peers, particularly on state summative assessments (Aron & Loprest, 2012). Disparities in academic achievement on these assessments can be attributed to various factors, including assessment practices, students' comfort levels during testing, and the severity of their disabilities. Assessing the efficacy of special education …

Systematics, Biogeography, And Floral Trait Evolution Of The Plant Genus, Medinilla (Melastomataceae), John Peter Quakenbush

Dissertations

Medinilla is a large paleotropical genus in the plant family Melastomataceae with a long history of systematic uncertainty. The first objective of this research is to test the monophyly of Medinilla. A species tree is estimated using 599 nuclear gene trees, and 87 concatenated chloroplast genes are used to estimate the plastid phylogeny. Sampling includes 272 Medinilla and outgroups. Pachycentria and Plethiandra are resolved within Medinilla. Other fleshy-fruitedgenera long associated with Medinilla (i.e., Catanthera, Heteroblemma, Kendrickia) belong to other clades. With this new evolutionary framework, an infrageneric classification system is proposed for Medinilla consisting of …

Development Of Enzyme-Based Biotechnology For Removing Stickies And Regaining Fiber Quality In Paper Recycling, Yun Wang

Dissertations

Producing paper with recycled paper consumes about 30-70% less energy and emits less GHG than using virgin wood. However, with current recycling practices, more foreign matters are commingled with the recycled paper including hot-melt adhesives, food residues, inks, resins/sizing agents, and coating adhesives, which result in stickies issues in the paper remanufacturing process. On the other hand, recycled fibers inherently have lower quality due to mechanical treatment, heating, chemical processing, and aging in various types of application/use of paper products, limiting the production of high-quality paper grades from recycled fibers. The goal of this dissertation research is to address both …

Establishing Practical Equivalence Of Factor Loadings In Multigroup Confirmatory Factor Analysis, Christopher Edward Shank

Dissertations

This dissertation compares the performance of equivalence test (EQT) and null hypothesis test (NHT) procedures for identifying invariant and noninvariant factor loadings under a range of experimental manipulations. EQT is the statistically appropriate approach when the research goal is to find evidence of group similarity rather than group difference; despite this, the conventional approach to measurement invariance analysis relies upon NHT. EQT has proved effective for invariance detection using global model-data fit statistics in simulated and real-world data (Counsell et al., 2020) but its use in partial measurement invariance (PMI) analysis for evaluation of factor loading differences between groups has …

Identity And Alterity In A Comedy Series From Santa Cruz, Bolivia, During The Presidency Of Evo Morales, Anita L. Zandstra,

Dissertations

This dissertation explores the construction of social identity and social difference in and through Neo/Los Mismos, a Bolivian comedy series produced during the presidency of Evo Morales (2006-2019), the country’s first president to claim an Indigenous identity. These years were characterized by profound divisions between the Bolivian highlands, home to Morales’s base of support, and the opposition based in the lowlands department of Santa Cruz. This qualitative study takes an interdisciplinary approach to social identity and social difference during the Morales era, drawing on concepts from linguistic anthropology, literary criticism, and humor studies, and tracing connections between Neo/Los Mismos and …