Digital Commons Network^™

Evaluating The Impact Of Adopting 3d Printing Services On The Retailers, Sharareh Rajaei Dehkordi

Dissertations

As additive manufacturing technology becomes more responsive to consumers’ demand, one important question for the retailers is whether they should provide 3D printing services in their brick-and-mortar store in addition to the traditional off-the-shelf product? If so, what should be the retailers pricing scheme to achieve a higher profit? What should be the optimal inventory level of off-the-shelf products? What is the optimal capacity of 3D printers? In this study, stochastic models are examined to capture the joint optimal 3D product price and capacity of 3D printers to maximize retailer’s expected profit while considering consumer product choices. Moreover, a stochastic …

Numerical Methods And Simulation For Time Dependent Electrokinetic Flow, Rui Cao

Dissertations

Electrokinetic flow typically occurs when an electric field is applied to a fluid electrolyte in the presence of a boundary or interface. The electric field induces a force that causes oppositely charged ions to migrate in opposite directions while simultaneously diffusing due to Brownian motion. In an unbounded medium this process, which is called electrodiffusion, does not separate bulk electric charge into separate regions and causes no bulk motion of the host fluid solvent. However, in the presence of a boundary or interface that either impedes or is impervious to the movement of ions in the normal direction, the normal …

Black Silicon – Optical Properties And Applications, Sita Rajyalaxmi Marthi

Dissertations

Crystalline Silicon (c-Si) is one of the most abundant and widely used semiconductors. Si is a semiconductor with indirect bandgap. The average reflectance of Si is about 30% in the visible range of wavelengths. Standard Si solar cells are not entirely useful in the infrared spectrum region. In order to make Si useful in a wide spectral range, the surface of Si is modified to reduce the reflectance of Si. The silicon thus modified is called Black Silicon (BSi).

This dissertation describes the model based on effective medium approximation to determine the effective optical constants, refractive index and extinction coefficient …

Validation Of The Multilayered Gender Identity Questionnaires, Philip Eiseman

Dissertations

Gender identity shapes the ways transgender adults experience themselves and relate to the world around them. Although research and theory suggest that gender identity is a multidimensional construct, most measures of gender identity have viewed gender as primarily a unitary construct tied to the gender binary. The aim of this study was to develop and validate the Multilayered Gender Identity Questionnaires (MGIQ), a set of measures of gender identity, in a sample of transgender adults. Qualitative data collected through focus groups with transgender adults (N = 7) helped refine and develop these measures. A series of analyses involving a …

Latino Male College Students' Identities, Psychological Stress, And Coping Mechanisms, Ana E. Ramirez

Dissertations

Latino male college students’ identities impact their personal experiences, academic achievement, and well-being. This qualitative study uses a narrative inquiry approach to research Latino male college students’ racial and ethnic, gender, and academic identities and to investigate how these identities impact their psychological stress and the coping mechanisms they implement to manage their stress. Latino males undergo an identity development in which they engage in negotiating their gender identities in order to prioritize higher education academic requirements. When Latino males are determined to achieve a college degree, they are able to adjust their familism gender role expectations and shift their …

Effects Of Trophic Relationships On Oyster Reef Restoration Success In The Mississippi Sound, Virginia Robin Fleer

Dissertations

Natural and anthropogenic changes resulting from altered hydrology, hurricanes, variable precipitation, and the BP oil spill have all taken their toll on oyster reefs in Mississippi. In response, oyster reef restoration efforts are currently underway within the Northern Gulf of Mexico. In order to understand why these efforts succeed or fail, it is crucial to consider predator-prey relationships within the context of the trophic dynamics of oyster reefs. Thus, for this dissertation study I integrated a multidisciplinary approach to understanding key trophic interactions affecting oyster recruitment, growth and survival, comprising field sampling, manipulative lab experiments, and individual-based modeling. Spat settlement …

Historical Change Of Seagrasses In The Mississippi And Chandeleur Sounds, Linh Thuy Pham

Dissertations

Seagrasses are important coastal resources facing numerous stressors, and losses have been documented from local to global assessments. Under the broad theme of habitat loss and fragmentation, a study of historical change in total area and landscape configuration of seagrasses in the Mississippi and Chandeleur Sounds was conducted. Mapping data was collated from a multitude of previous projects from 1940 to 2011.

Comparisons of seagrass area among various studies that used different mapping methods can result in overestimation of area change and misleading conclusions of change over time. The vegetated seagrass area (VSA) data were generalized to a common resolution …

Examining The Perceived Influence Of A Comprehensive Youth Development Program For Promoting Black Male High School Persistence, Richard Gray Walker

Dissertations

Black male youth in the United States drop out of high school at a rate consistently higher than their White counterparts. A lack of academic persistence contributes to lower workforce participation rates among Black Americans, which leads to lower national productivity and unrealized personal prosperity. Youth development research has developed an extensive body of knowledge regarding possible causes and contributing factors of minority high school dropout. Literature shows youth experience higher dropout rates when they grow up in adversity. Adversity risks such as dysfunctional families, cultural discontinuity between home and school, dysfunctional neighborhoods, or low-expectations from teachers contribute to graduation …

Using Eye-Tracking And Molecular Modeling To Explore Students’ Strategies For Solving Organic Stereochemical Problems, Travis Howard Knowles

Dissertations

Stereochemistry concepts are often some of the most difficult topics for students to grasp in the organic chemistry curriculum. Several factors may influence students’ abilities to solve stereochemistry problems, including their spatial abilities, strategy choice, and ability to use various types of spatial representations. A mixed-method study was conducted to investigate the role that these factors play when novice organic chemistry students solve stereochemistry problems. Eye-tracking methods were used in an attempt to capture cognitive processes of students while solving these problems. Additionally, three-dimensional molecular models and spatial ability measures were used to further analyze and characterize their strategies for …

(Dis)Integrated Identities: Experiences Of Tenure- Track Engineering Faculty Who Identify As Sexual Minorities, Robyn Elisa Sandekian

Dissertations

This study was conducted to explore how full-time, tenure-track engineering faculty members who self-identify as sexual minorities have experienced working in Doctoral Universities. Literature reviewed for this study included the history of higher education and engineering education in the United States; a review of the differences between engineering and science, technology, engineering, and mathematics (STEM) fields; and an overview of the history of discrimination against sexual minorities. Using a mixed-methods explanatory sequential methodology, the study included an anonymous web-based survey followed by semi-structured interviews of the participants who agreed to be contacted. During the interviews, participants shared photographs of their …

Exploring Students’ Use Of Learning Contracts In Preparing For The National Athletic Training Board Certification Examination, William Dill

Dissertations

The purpose of this study was to explore the application of learning contracts in the process of preparing to take the AT BOC exam. The goal of this study was to investigate best practices to assist students in being successful when taking the BOC certification examination. Self-directed learning in medicine was an important skill in the ever-changing healthcare landscape. One self-directed learning tool, learning contracts, had been studied in other healthcare fields. However, little research had been conducted utilizing learning contracts in athletic training. In addition, providing students with a research based instrument that could be used to improve success …

Urinary Incontinence And Women’S Quality Of Life In Oman, Alya Ali Abdullah Al Hasni

Dissertations

Urinary incontinence (UI) is a common public health concern among women worldwide, with adverse effects on their quality of life (QoL). This study aims to explore the prevalence of UI among Omani women aged 18-49 years old, and to explore the impact of UI on women's daily prayers, physical activities, social life, mental health, and general QoL. The study is of quantitative comparative design, and the researcher used the World Health Organization’s (WHOs) International Classification of Functioning, Disability and Health (ICF), as a conceptual framework. The researcher randomly chose four-hundred and one participants from ten primary health care centres in …

Evaluation Instruction In Council On Education For Public Health Accredited Master Of Public Health Schools And Programs, Kristin Ann Hobson

Dissertations

Despite the increasing role of evaluation in public health practice and research (Association of Schools and Programs of Public Health [ASPH], 2006; Institute of Medicine [IOM], 1998; Public Health Functions Steering Committee, 2008; United States Government Accountability Office [GAO], 2012), as well as Henry and Mark’s (2003) assertion of a need for systematic evidence on evaluation training and education, the literature continues to lack studies on evaluation instruction in Council on Education for Public Health (CEPH)-accredited Master of Public Health (MPH) schools and programs. As such, this study explored evaluation instruction in CEPH-accredited MPH schools and programs in the following …

Development Of Innate Immunity During In Vitro Differentiation Of Mouse Embryonic Stem Cells, William D'Angelo

Dissertations

Embryonic stem cells (ESCs) hold enormous promise for the goals of regenerative medicine and tissue engineering, and extraordinary progress has been made in defining conditions for differentiation to desired cell types. However, an often overlooked aspect of ESC biology is innate immunity, the ability of cells to detect and respond to pathogens and inflammatory cytokines. A number of recent studies by our lab and others have established that ESCs and other types of pluripotent cells from both mice and humans do not mount typical immune responses to viral or bacterial stimuli. There are also indications that various cell types differentiated …

Ecological And Oceanographic Influences On Leatherback Turtle Behavior And Scyphozoan Jellyfish Distributions In The Gulf Of Mexico, Katrina Aleksa

Dissertations

Leatherback turtles (Dermochelys coriacea) are a wide-ranging, oceanic species that feed exclusively on gelatinous zooplankton. Leatherback have been spotted in the Gulf of Mexico (GoM) for several decades and consistently had a high level of interactions with longline fisheries. However, no quantitative studies have been performed to address the spatiotemporal distribution of these turtles in the GoM. This research determines 1) leatherback movements and high-use areas in the GoM, 2) their association with oceanographic features, 3) the distribution and density of two abundant medusae in the northern GoM and any association with biophysical parameters, and 4) the body …

An Examination Of Subtypes Of Posttraumatic Stress Disorder Utilizing Latent Profile And Taxometric Analyses, Joseph Finn

Dissertations

Prior studies examining PTSD subtypes have yielded mixed results, likely stemming in part from the use of divergent samples and measurement techniques. This study aimed to expand upon these findings by utilizing a large nationally-representative sample in combination with sophisticated statistical analyses. Utilizing a sample of 2496 adults with a diagnosis of PTSD, latent profile analysis was used to determine the optimal number and composition of latent classes of individuals diagnosed with PTSD, and then taxometric analysis was utilized to determine whether these classes differed not only in degree, but in kind.

Finally, class relationships with a number of external …

A Collaborative & Systematic Approach To Implementing An Effective Standards-Based Grading And Reporting System: A Change Leadership Plan, Hector Freytas

Dissertations

This mixed methods study examined the collaborative efforts between the Standards-Based Grading and Reporting Committee (SBGRC) at Mountain West High School (MWHS) and the Leadership District Team (LDT), which consisted of the following stakeholders: the district superintendent, the chief business officer, the chief financial officer, multiple principals and assistant principals, students, and parents of Mountain West School District (MWSD). These groups researched effective grading and reporting policies and procedures for possible implementation, and worked toward developing a specific, measurable, attainable, realistic, and timely (SMART) goal. In addition, a multiyear action plan was cocreated to streamline the process (DuFour, 2006). This …

Teachers' Perceptions On Professional Learning: A Mixed Method Program Evaluation In A Middle School Setting, Emily Crement

Dissertations

The purpose of this research was evaluate the program of teacher professional learning at Hamlin Middle School to guide formative improvement, therefore maximizing the potential of increasing teacher effectiveness and results. By facilitating evaluative thinking among teachers on the topic of teacher professional learning, the goal was to change how teachers conceptualize teacher professional learning. The discussion of professional learning was based on the Modes of Learning Framework (HarvardX, 2014), which organizes learning along two continua: hierarchical-distributed and individual-collective. Methodology included a survey on teachers’ perceptions on the modes of learning, and focus group discussions in which participants interpreted survey …

Perceived Ideal Traits Of A Mentor As Viewed By African American Students In Science, Technology, Engineering, And Mathematics, Mary L. Smith

Dissertations

The purpose of this study was to examine undergraduate students majoring in science, technology, engineering, and math disciplines perception of traits an ideal mentor should possess, and to determine if these traits had positive results on their identification with science. With a large number of workers in STEM disciplines retiring, there is a projected need for more underrepresented minorities to fill these positions. In order to increase diversity in the workforce, efforts must be made to retain underrepresented minorities in STEM education beginning at the undergraduate level and continuing throughout the graduate level. This intervention should begin as early as …

Development, Evaluation, And Application Of A Novel Error Correction Method For Next Generation Sequencing Data, Isaac Akogwu

Dissertations

Tremendous evolvement in sequencing technologies and the vast availability of data due to decreasing cost of Next-Generation-Sequencing (NGS) has availed scientists the opportunity to address a wide variety of evolutionary and biological issues. NGS uses massively parallel technology to accelerate the process at the expense of accuracy and read length in comparison to earlier Sanger methods. Therefore, computational limitations exist in how much analysis and information can be gleaned from the data without performing some form of error correction.

Error correction process is laborious and consumes a lot of computational resources. Despite the existence of many NGS data error correction …

Short-Term Memory Capacity And Recall Of Students With And Without Intellectual Giftedness: An Empirical Inquiry, Angela Foil Ellison

Dissertations

The goal of this research is to examine the differences of short-term memory capacity between intellectually gifted, general education, and students receiving special education services. Using foundations in memory and recall research by Atkinson and Shiffrin and Baddeley and Hitch, data was collected by replication of a previous serial position effect research design. Participants were children in grades four through six located in the southern portion of the United States. An ANOVA analysis found a statistical significance between students receiving special education and general education and gifted students. A failure to reject of the null hypothesis supported that short-term memory …

Race, Socioeconomic Status, And Implicit Bias: Implications For Closing The Achievement Gap, Elizabeth Schlosser

Dissertations

This study accessed the relationship between race, socioeconomic status, age and the race implicit bias held by middle and high school science teachers in Mobile and Baldwin County Public School Systems. Seventy-nine participants were administered the race Implicit Association Test (race IAT), created by Greenwald, A. G., Nosek, B. A., & Banaji, M. R., (2003) and a demographic survey. Quantitative analysis using analysis of variances, ANOVA and t-tests were used in this study. An ANOVA was performed comparing the race IAT scores of African American science teachers and their Caucasian counterparts. A statically significant difference was found (F = …

Escorting Of Mother-Calf Pairs Of Humpback Whales (Megaptera Novaeangliae) In The Colombian Pacific During The Breeding Season, Natalia Botero Acosta

Dissertations

Humpback whales (Megaptera novaeangliae) belonging to the “breeding G-stock” annually migrate from the Antarctic Peninsula and southern Chile to the southeastern Pacific to reproduce. Associations between mother-calf pairs and escorts were examined in the Gulf of Tribugá, northern Colombian Pacific, using photo-identification and behavioral/spatial sampling. Research hypotheses included: 1. The association between cows and escorts is short-lived, consistent with a male reproductive strategy, 2. The presence of escort(s) elicits a behavioral response from mother-calf pairs and, 3. The patterns of spatial distribution reflect the spatial segregation of maternal females. Groups were classified as mother-calf pairs (Mc), mother, calf …

Electrophilic Cleavage And Functionalization Of Polyisobutylenes Bearing Unsaturations In The Backbone And Synthesis Of Polymers For This Process, Christopher Campbell

Dissertations

In the first project, we demonstrated a new reaction, which is a subset of the Friedel‑Crafts alkylation reaction, in which the alkylating carbocation undergoes a cleavage reaction prior to reaction with the aromatic substrate. This reaction was discovered by the observation that when a PIB containing a large amount of coupled fraction was subjected to a mixture of protic and Lewis acids (HCl/TiCl₄) in the presence of an alkoxybenzene compound, the coupled fraction was quantitatively converted to its constituent monofunctional chains, which became functionalized by the alkoxybenzene.

In the second project, a commercial polymer, poly(isobutylene-co-isoprene) (butyl …

Evaluating Social Network Dynamics Of Bigg’S Killer Whales (Orcinus Orca) And Vessel Traffic Within A Transboundary Region: Implications For Conservation Management, Courtney Smith

Dissertations

The social lives of animals are defined by group dynamics based on the nature and strength of associations and movements between individuals, often resulting in highly complex and interconnected social networks. However, understanding of how environmental variables may shape this structure is poorly understood. Within the inland waters of Washington State and southern Vancouver Island, British Columbia, mammal-eating Bigg’s (transient) killer whales occur in relatively small, but stable social groups. Group size and occurrence in recent years has increased, coinciding with a growing whale watching industry. Given the central importance of the social network within killer whale population dynamics, such …

Transformative Experiential Impacts On Students: An Intervention, Stacy R. Bailey

Dissertations

Students’ successes in first-year writing courses at the university level are critical to academic success and degree completion. Fostering students' engagement in first-year writing courses has proved challenging for institutions of higher education (IHE). Utility value interventions (UV) employing social psychological intervention (SPI) methods have been implemented successfully to aid students in understanding the value of course content and improve achievement. Utility value is the perceived usefulness of a task or content. Similarly, transformative experience (TE) interventions have been implemented with success. Transformative experience is a learning outcome achieved when students re-conceptualize their out-of-school experiences as a result of their …

Estimating Bias In Multilvel Reliability Coefficients: A Monte Carlo Simulation, Karen Traxler

Dissertations

Purpose: The purpose of this dissertation was to generate observed scores under complex data conditions often found in the real world and (a) investigate error in terms of internal consistency reliability within the Classical Test Theory framework (Cronbach’s a and polychoric ordinal a) and person reliability within Rasch Rating Scale Model (RSM); (b) inform applied researchers about possible relative bias in reliability coefficients when more complex data structures and underlying distributions are encountered; and (c) provide applied researchers a reference from which to interpret their results. Methods: Using Monte Carlo simulation techniques to generate polytomous response choices in single-level and …

A Validation Of The Tactile Edition Of The Boehm-3 Preschool, Catherine Ann Smyth

Dissertations

The purpose of this research was to conduct a validation study of the Boehm-3 Preschool tactile version, which was designed to allow young children with visual impairment and who use their tactile abilities as their primary modality to discover and interpret the world to demonstrate knowledge of concept understanding. It is well established that concept understanding is one of the most important skills a young child with visual impairment should master. The progression of concept development and haptic understanding of two-dimensional representation in young children with visual impairment was a focus of this research to inform parents, practitioners, and researchers. …

Anna He Purnabramha: Deorukhe Women’S Agency In The Making Of Bodies, Cuisines, And Culture In Maharashtra, India, Gauri Anilkumar Pitale

Dissertations

The world is changing. India is changing. Food is changing. Bodies are changing. What does this mean for the women of Maharashtra, India? Globalization and modernity manifest in new and interesting ways the world over. As people establish networks of global commodity, capital, and human circulation, anthropologists raise pertinent concerns. While some are apprehensive about cultural loss and western cultural imperialism, others make a case for the rise of glocalization. While some espouse the positives of a free market economy, others are critical of the nutrition transition in developing countries and what this means for the health of the people …

Assessing The Cultural Effects Of Neoliberalism On Empathy, Melissa May Racho

Dissertations

The current study examined the effect of neoliberalism on the expression of empathy among 40 undergraduate college students. Participants were divided across three groups: two treatment groups who were exposed to either a neoliberal or critical primer and a control group with no exposure to a primer. Individuals were randomly assigned to each condition prior to completing three empathy measures: The Empathic Concern and Perspective Taking subscales of the Interpersonal Reactivity Index, and the Reading the Mind in the Eyes Test. Mean scores were analyzed using multivariate analysis of variance (MANOVA) and revealed no significant differences between groups, indicating the …