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2022

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Uav Path Planning And Multi-Modal Localization For Mapping In A Subterranean Environment, Kieren Yoshiki Samarakoon Jan 2022

Uav Path Planning And Multi-Modal Localization For Mapping In A Subterranean Environment, Kieren Yoshiki Samarakoon

Graduate Theses, Dissertations, and Problem Reports (ETD)

The use of Unmanned Aerial Vehicles (UAVs), especially quadcopters, have become popular in academia and industry due to their small size and maneuverability. These UAVs can be programmed to autonomously execute missions that are usually difficult and risky for humans, such as subterranean exploration, infrastructure surveying, and even disaster response. However, inaccessible and remote environments pose a challenge in terms of navigation as they often lack access to Global Navigation Satellite System (GNSS) connections and lack features. To address these challenges, UAVs are equipped with multiple sensors to acquire different types of data. These include range, acceleration, and even images, …

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Advanced Process Modeling And Optimization Of Amine-Based Carbon Capture Process, Paul Jide Terhemba Akula Jan 2022

Advanced Process Modeling And Optimization Of Amine-Based Carbon Capture Process, Paul Jide Terhemba Akula

Graduate Theses, Dissertations, and Problem Reports (ETD)

With the rise of carbondioxide (CO2) concentration in the atmosphere to more than 400 parts per million (ppm), research efforts have been focused on achieving net-zero carbon emission technologies. Post-combustion CO2 capture (PCC) is a key strategy in reducing CO2 emissions. Amine-based CO2 capture is the baseline technology for retrofitting existing power stations. However, the integration of amine-based PCC technology with power plants to reduce greenhouse gas emissions incurs a high energy penalty, decreasing a powerplant’s efficiency by about 23 percentage points. Understanding the capture plant dynamics plays an important role in its technical and economic performance. Rigorous models are …

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Study Of Resonantly Stabilized Radicals In Combustion Environments, James H. Lee Jan 2022

Study Of Resonantly Stabilized Radicals In Combustion Environments, James H. Lee

Graduate Theses, Dissertations, and Problem Reports (ETD)

Resonantly stabilized radicals (RSRs) play an important role in combustion environments due to their high stability resulting from resonance. Many RSRs such as the propargyl, allyl, or benzyl radicals are precursors to the formation of polycyclic aromatic hydrocarbons (PAHs), which can aggregate to form soot. Due to their stability, these RSRs can accumulate in combustion environments in significant quantities. The primary way these radical species are consumed in flames or by reactions with other abundant radicals, by self-recombination of propargyl to form benzene, or in the form of other abundant radicals such as the hydroxyl radical. Experimentally determining the pathways …

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Using Landsat-Based Phenology Metrics, Terrain Variables, And Machine Learning For Mapping And Probabilistic Prediction Of Forest Community Types In West Virginia, Faith M. Hartley Jan 2022

Using Landsat-Based Phenology Metrics, Terrain Variables, And Machine Learning For Mapping And Probabilistic Prediction Of Forest Community Types In West Virginia, Faith M. Hartley

Graduate Theses, Dissertations, and Problem Reports (ETD)

This study investigates the mapping of forest community types for the entire state of West Virginia, USA using Global Land Analysis and Discovery (GLAD) Phenology Metrics analysis ready data (ARD) derived from the Landsat time series and digital terrain variables derived from a digital terrain model (DTM). Both classifications and probabilistic predictions were made using random forest (RF) machine learning (ML) and training data derived from ground plots provided by the West Virginia Natural Heritage Program (WVNHP). The primary goal of this study is to explore the use of globally consistent ARD data for operational forest type mapping over a …

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A Workflow For Unconventional Reservoirs Optimization Using Supervised Machine Learning In Conjunction With Orthorhombic Elasticity Modeling, Aymen Ab Ali Alhemdi Jan 2022

A Workflow For Unconventional Reservoirs Optimization Using Supervised Machine Learning In Conjunction With Orthorhombic Elasticity Modeling, Aymen Ab Ali Alhemdi

Graduate Theses, Dissertations, and Problem Reports (ETD)

Due to the anisotropy and heterogeneous nature of unconventional reservoirs like shale, a comprehensive parametric study to optimize hydraulic fracture treatment for such reservoirs is a tough challenge, especially when natural fractures are present. Most of the current frac simulators do not consider the anisotropy of rock elasticity in the shales. Besides, using the fracture simulation linked with reservoir simulation for the parametric study to understand the impact of multiple different design parameters on fracture propagation and production is time expensive and low efficient. The study proposes a workflow including a new orthorhombic (OB) rock algorithm to interpret geomechanical properties …

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A Combinatorial 5-Htr Expression Pattern Within The Ventral Projection Neurons Of The D. Melanogaster Olfactory Circuit., Mohd Freezely Ezzani Bin Mazri Jan 2022

A Combinatorial 5-Htr Expression Pattern Within The Ventral Projection Neurons Of The D. Melanogaster Olfactory Circuit., Mohd Freezely Ezzani Bin Mazri

Graduate Theses, Dissertations, and Problem Reports (ETD)

Neuromodulation allows neurons within a circuit to respond to stimuli from the environment according to the correct ecological value, context, and internal state of the animal. Serotonin (5-HT) is a neuromodulator that can generate different outcomes based on its target’s serotonin receptor (5-HTR) expression by affecting secondary messenger cascades. Within the Drosophila olfactory system, ventral projections neurons (vPN) express all five insect 5-HTR that project into two olfactory processing regions, the antennal lobe (AL) and the lateral horn (LH). The significance of this 5-HTR expression is unknown. In this study, I theorized the patterns of 5-HTR expression of vPNs. I …

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Development Of Capillary Vibrating Sharp-Edge Spray Ionization For Improving Continuous Flow Mass Spectrometry Analysis, Chong Li Jan 2022

Development Of Capillary Vibrating Sharp-Edge Spray Ionization For Improving Continuous Flow Mass Spectrometry Analysis, Chong Li

Graduate Theses, Dissertations, and Problem Reports (ETD)

Capillary Vibrating Sharp-Edge Spray Ionization (cVSSI) is new ionization technique developed in the year of 2018. This ionization technique has attractive features such as simplicity, compactness, ease of manipulation, low costs, compatible with continuous flow, etc. However, the development of high performance cVSSI for mass spectrometry analysis is a process that needs unremitting optimizations. In this dissertation, I demonstrate the development of cVSSI for improving continuous flow mass spectrometry analysis. The chapter 2 focuses on improving the ionization efficiency of cVSSI through reducing the droplet size. Three strategies were tested to reduce the droplet size of VSSI. The most effective …

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Charge Dynamics Of Inas Quantum Dots Under Resonant And Above-Band Excitation, Gary R. Lander Jr Jan 2022

Charge Dynamics Of Inas Quantum Dots Under Resonant And Above-Band Excitation, Gary R. Lander Jr

Graduate Theses, Dissertations, and Problem Reports (ETD)

Research involving light-matter interactions in semiconductor nanostructures has been an interesting topic of investigation for decades. Many systems have been studied for not only probing fundamental physics of the solid state, but also for direct development of technological advancements. Research regarding self-assembled, epitaxially grown quantum dots (QDs) has proven to be prominent in both regards. The development of a reliable, robust source for the production of quantum bits to be utilized in quantum information protocols is a leading venture in the world of condensed matter and solid-state physics. Fluorescence from resonantly driven QDs is a promising candidate for the production …

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Top-Down & Bottom-Up Approaches To Robot Design, Dylan Michael Covell Jan 2022

Top-Down & Bottom-Up Approaches To Robot Design, Dylan Michael Covell

Graduate Theses, Dissertations, and Problem Reports (ETD)

This thesis presents a study of different engineering design methodologies and demonstrates their effectiveness and limitations in actual robot designs. Some of these methods were blended together with focus on providing an easily interpreted project design flow while implementing more bottom-up, or feedback, elements into the design methodology. Typically design methods are learned through experience, and design taught in academia aims to shape and formalize previous experience. Usually, inexperienced engineers are taught approaches resembling the Verein Deutscher Ingenieure (VDI) 2221 process. This method presented by the Association of German Engineers in 2006 is regarded as the general system design process. …

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On Generalizations Of Supereulerian Graphs, Sulin Song Jan 2022

On Generalizations Of Supereulerian Graphs, Sulin Song

Graduate Theses, Dissertations, and Problem Reports (ETD)

A graph is supereulerian if it has a spanning closed trail. Pulleyblank in 1979 showed that determining whether a graph is supereulerian, even when restricted to planar graphs, is NP-complete. Let $\kappa'(G)$ and $\delta(G)$ be the edge-connectivity and the minimum degree of a graph $G$, respectively. For integers $s \ge 0$ and $t \ge 0$, a graph $G$ is $(s,t)$-supereulerian if for any disjoint edge sets $X, Y \subseteq E(G)$ with $|X|\le s$ and $|Y|\le t$, $G$ has a spanning closed trail that contains $X$ and avoids $Y$. This dissertation is devoted to providing some results on $(s,t)$-supereulerian graphs and …

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Navigating Abrupt Shifts In Contextual Discourses During A Pandemic And Lack Of Mentorship: A Preservice Teacher’S Journey Developing Critical Pedagogical Discourses, Casey L. King Jan 2022

Navigating Abrupt Shifts In Contextual Discourses During A Pandemic And Lack Of Mentorship: A Preservice Teacher’S Journey Developing Critical Pedagogical Discourses, Casey L. King

Graduate Theses, Dissertations, and Problem Reports (ETD)

This study is centered on one English language arts (ELA) preservice teacher’s development of her critical pedagogical discourses (CPD) with the contextual discourses of a school placement for preservice teaching and later shift to a full-time teacher before the placement was complete during a pandemic and in the midst of implementing online learning. Data is drawn from a 4-month interpretive qualitative case study that included classroom observations and semi-structured interviews. The objective for this study included how a preservice teacher uses their beliefs and identity about instruction amid changing contextual discourses in a pandemic and with a lack of mentorship. …

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Multisided Quality Inspection In Smart Manufacturing Systems, Milica Babic Jan 2022

Multisided Quality Inspection In Smart Manufacturing Systems, Milica Babic

Graduate Theses, Dissertations, and Problem Reports (ETD)

As technology advances so does its adoption in industry and our everyday lives. We use technology to better our daily tasks whether at home or in the workplace. In the workplace there are many benefits of implementing new technologies to improve processes and products while at the same time being cautious about associated costs. Costs associated with incorporating new digital technologies include but are not limited to hardware and software, system integration, testing, and employee training. Now that we have entered the era of the Fourth Industrial Revolution, there are many opportunities for improvements in manufacturing that involve Smart Digital …

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Understanding Surface Water--Groundwater Connectivity And Discharge In Arctic Deltas, Lindsey N. Aman Jan 2022

Understanding Surface Water--Groundwater Connectivity And Discharge In Arctic Deltas, Lindsey N. Aman

Graduate Theses, Dissertations, and Problem Reports (ETD)

Increased warming is driving unprecedented hydrologic changes within arctic deltas with implications for water storage, solute processing, and terrestrial and marine ecology. Thermokarst lakes within Arctic deltas store flood waters and filter solutes and sediments, thus moderating the impact of flood water discharge to arctic seas. However, this moderating influence is diminishing as lakes shrink on annual and seasonal time scales, especially close to active channels where lakes are shrinking most rapidly. This study investigates surface water-groundwater connectivity in arctic delta plains with coupled flow and heat transport models to provide a mechanistic understanding of how lake-channel proximity will impact …

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Identifying And Minimizing Sources Of Variability Within Modern Spectroscopic Techniques For The Forensic Analysis Of Glass, Oriana Christy Ovide Jan 2022

Identifying And Minimizing Sources Of Variability Within Modern Spectroscopic Techniques For The Forensic Analysis Of Glass, Oriana Christy Ovide

Graduate Theses, Dissertations, and Problem Reports (ETD)

Broken glass is a trace material frequently found at crime scenes such as hit-and-runs, burglaries, assaults, and homicides. Existing research encompassing the forensic analysis of glass evidence is vast. Published studies cover the analysis and interpretation of various types of glass. However, organizations such as the National Institute of Justice (NIJ), National Institute of Standards and Technology Organization of Scientific Area Committees (NIST-OSAC), and American Society of Trace Evidence Examiners (ASTEE) continue to identify glass-specific research needs to strengthen the scientific foundations of the field. Current gaps within the forensic glass community involve understanding modern glass formulations, re-evaluating the performance …

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Synthesis And Cyclotrimerization Of Sulfonyl Enynes, Alexa C. Martin Jan 2022

Synthesis And Cyclotrimerization Of Sulfonyl Enynes, Alexa C. Martin

Graduate Theses, Dissertations, and Problem Reports (ETD)

The synthesis of complex, polysubstituted aromatic rings from simple, non-aromatic building blocks is a consistent challenge to the synthetic community. Neopentylene ring fusions are found in several natural products but are largely absent from synthetic compound libraries. This discrepancy reflects the limitations in modern chemical synthesis. Utilizing, in part, a thoroughly developed fragmentation/olefination methodology from the Dudley Lab, a library of novel 1-sulfonyl-1,6-enynes have been developed. In this methodology, they are prepared in three steps from dimedone (5,5-dimethyl-1,3-cyclohexanedione), an inexpensive starting material. A total of 14 novel 1-sulfonyl-1,6-enynes were synthesized. These substrates were subjected to a novel benzannulation reaction based …

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Discussing Changes In Historical Human–Environmental Dynamics Through Ecosystem Services Interactions And Future Scenarios In A Rural-Mining Region Of Central Appalachians, Vincenzo Cribari Jan 2022

Discussing Changes In Historical Human–Environmental Dynamics Through Ecosystem Services Interactions And Future Scenarios In A Rural-Mining Region Of Central Appalachians, Vincenzo Cribari

Graduate Theses, Dissertations, and Problem Reports (ETD)

The aim of this dissertation was to investigate how recent processes of land-change induced by humans contributed to the shaping and alteration of the current landscape in a headwater system of Central Appalachians in West Virginia (US), to understand the interactions and tradeoffs among ecosystems services and address potential solutions for targeting more sustainable human-environment interactions in a region that is deeply grounded on extractive economies. The multitiered objective was addressed through different research phases in order to unfold and disentangle a series of complex problems that the study area presents. Three main phases were used; they corresponded to distinct …

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Analysis Of Forensically Relevant Evidence Using Electrochemistry, Spectroscopy, And Mass Spectrometry Tools, Colby Edward Ott Jan 2022

Analysis Of Forensically Relevant Evidence Using Electrochemistry, Spectroscopy, And Mass Spectrometry Tools, Colby Edward Ott

Graduate Theses, Dissertations, and Problem Reports (ETD)

Forensic science relies on the use of multiple techniques in the assessment of evidence to increase the accuracy and reliability of the results. However, with the rapidly changing drug landscape due to the introduction of novel psychoactive substances, many traditional screening methods are no longer sensitive or selective enough for use. Additionally, many screening methods such as chemical color tests are prone to false positive and negative results and are subjective. Therefore, the goal of this dissertation was to develop a novel analytical scheme that can provide a more efficient, rapid, and sensitive method that will facilitate adoption in the …

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Collaborative Practices Between General Education And Special Education Teachers In Middle School Inclusion Classrooms, Wanda Ray Washington Jan 2022

Collaborative Practices Between General Education And Special Education Teachers In Middle School Inclusion Classrooms, Wanda Ray Washington

Walden Dissertations and Doctoral Studies

To improve the learning of students with disabilities, the collaboration between generaleducation and special education teachers in middle school inclusion classrooms needs to be increased. This basic qualitative study aimed to explore general education and special education teachers’ coteaching relationships in inclusion classrooms. Pratt’s achieving symbiosis theory was used to frame the study. The research question investigated the difficulties middle school general education and special education teachers encountered that prevented them from attaining a symbiotic relationship in the inclusion classroom. A basic qualitative study was used to gain insight from certified, middle school coteachers in inclusion classrooms who taught in …

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Exploring Implementation Strategies Of Iot Technology In Organizations: Technology, Organization, And Environment, Khanhhung Hoang Pham Jan 2022

Exploring Implementation Strategies Of Iot Technology In Organizations: Technology, Organization, And Environment, Khanhhung Hoang Pham

Walden Dissertations and Doctoral Studies

AbstractAfter organizations successfully adopt the internet of things (IoT) technology, many corporate information technology (IT) leaders face challenges during the implementation phase. Corporate IT leaders' potential failures in implementing IoT devices may impede organizations from integrating IoT solutions and promoting business benefits. Grounded in technology-organization-environment (TOE) theory, the purpose of this qualitative, pragmatic inquiry study was to explore strategies that corporate IT leaders use to implement IoT technology in their organizations. The participants were six corporate healthcare IT leaders who successfully used implementation strategies for implementing IoT solutions for their organizations. Data were collected using semistructured interviews and industry security …

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College Students’ Perceptions Regarding High School Influences On Academic Buoyancy, Jeremy Travis Irwin Jan 2022

College Students’ Perceptions Regarding High School Influences On Academic Buoyancy, Jeremy Travis Irwin

Walden Dissertations and Doctoral Studies

The problem addressed by this study is the lack of student input in the development of resources to support academic buoyancy, leading to a gap in educational practices. Academic buoyancy is the ability to successfully deal with academic setbacks and challenges that are typical of the ordinary course of school life. The purpose of this study was to investigate the perceptions of recent high school students regarding the common academic setbacks and challenges they experienced in high school and how high schools could support students experiencing these challenges. Research questions examined participants’ perspective of the common academic setbacks and challenges …

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Perspectives Of Parents Of Black Head Start Graduates Regarding The Black-White Achievement Gap, Telisa Pitts Jan 2022

Perspectives Of Parents Of Black Head Start Graduates Regarding The Black-White Achievement Gap, Telisa Pitts

Walden Dissertations and Doctoral Studies

The problem of this study was the achievement gap that exists between Black and White children prior to kindergarten entrance. As children continue in school this gap grows substantially; therefore, it was important to understand perspectives of stakeholders regarding this gap. The purpose of this study was to explore perspectives of parents of Black Head Start graduates regarding the Black-White achievement gap, and how those perspectives shaped parents’ actions in promoting their children’s kindergarten readiness. The conceptual framework for this study was based on Bronfenbrenner’s ecological theory. The research questions focused on parents’ perspectives and how they believed those perspectives …

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Digital Strategies To Improve The Performance Of Pharmaceutical Supply Chains, Manish Shashi Jan 2022

Digital Strategies To Improve The Performance Of Pharmaceutical Supply Chains, Manish Shashi

Walden Dissertations and Doctoral Studies

Some supply chain managers at pharmaceutical companies lack strategies to digitalize integrated supply chain systems impacting their profitability. Digitalized supply chain management in a pharmaceutical company can help reduce operation costs, improve assets, enhance shareholders’ value, positively respond to customer demand, and generate profits. Guided by the theory of constraints, the purpose of this qualitative multiple case study was to explore strategies some pharmaceutical managers use to digitalize integrated supply chain systems to increase their profitability. The participants were five managers from four pharmaceutical companies in New Jersey with strategies to digitalize their integrated supply chain systems. Data collection included …

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Teaching Environment, Instructional Coaching, And Perceived Organizational Support On Educators’ Quality Of Work-Life, Patrick Terrell Hall Jan 2022

Teaching Environment, Instructional Coaching, And Perceived Organizational Support On Educators’ Quality Of Work-Life, Patrick Terrell Hall

Walden Dissertations and Doctoral Studies

In the field of education, work-life challenges are becoming a source of concern, especially during the recent global pandemic. This study sought to identify relationships between teaching environment, instructional coaching, perceived organizational support, and work-life quality. The variables in the study were measured using the following validated instruments: classroom environment scale; coaching evaluation scale; perceived organizational support scale; and the work-related quality of life scale. This research was informed by the ecological system theory, which served as the theoretical basis for the investigation. Elements of the ecological systems theory express a complex system of relationships that affects multiple levels of …

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Administrative Leaders’ Experiences With Information Communication Technology Platforms And Best Practices In Smart Schools, Byron B. Jackson Jan 2022

Administrative Leaders’ Experiences With Information Communication Technology Platforms And Best Practices In Smart Schools, Byron B. Jackson

Walden Dissertations and Doctoral Studies

Administrative leaders in traditional schools have failed to manage resources, implement best practices, and successfully integrate information communication technology (ICT) platforms into K-12 programs. The purpose of this qualitative, transcendental phenomenological study was to explore and discover the lived experiences of administrative leaders who have been successful in their integration of ICT platforms and best practices in K-12 smart schools. This study was framed by two concepts: (a) building digital capacity in smart schools and (b) ICT platforms integration in smart schools. Both concepts were theoretically grounded in social cognitive theory and system theory. Data were collected in semi structured …

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Association Of Myplate Diet And Exercise With Diabetes In African American Women, Brandi Jones Jan 2022

Association Of Myplate Diet And Exercise With Diabetes In African American Women, Brandi Jones

Walden Dissertations and Doctoral Studies

Lifestyle choices such as diet and physical activity have been described as significant predictors of preventable disease, such as Type 2 diabetes mellitus. African American women disproportionately develop Type 2 diabetes and are at greater risk, compared to Caucasian/European Americans. The purpose of this study was to examine the association of physical activity and adherence to the MyPlate diet plan with the occurrence of Type 2 diabetes among African American women. The health belief model was the theoretical foundation for this study. Research questions were designed to examine the extent to which diet and physical activity predict Type 2 diabetes. …

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Strategies For Developing Sustainable Supply Chain Links With Local Producers, Edwin Che Ngwa Jan 2022

Strategies For Developing Sustainable Supply Chain Links With Local Producers, Edwin Che Ngwa

Walden Dissertations and Doctoral Studies

Failure to sustain agriculture supply chain links with local producers may lead to supply chain disruptions affecting the flow of products and materials. Successful strategies are essential for agribusiness supply chain managers to maintain profitability. Grounded in the value-based supply chain model, the purpose of this qualitative multiple case study was to explore strategies agribusiness managers used to develop sustainable supply chain links with local producers to maintain profitability. Semistructured online interviews were conducted with six Cameroon agribusiness managers who developed sustainable supply chain links with local producers for more than 5 years. Data analysis of the interviews and administrative …

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Washington University Magazine, August 2022 Jan 2022

Washington University Magazine, August 2022

Washington University Magazine

No abstract provided.

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Exploration Of Industry Certifications Within Career Pathways, Ashley Childs Jan 2022

Exploration Of Industry Certifications Within Career Pathways, Ashley Childs

Murray State Theses and Dissertations

This phenomenological research study explored industry certifications in career and technical education. A grand tour question and three research questions guided this study. Data collected from interviews with graduate of career pathway programs, career and technical education instructors, and industry employers provided a thorough understanding of the issues experienced in career and technical education. This study revealed a need for appropriate industry certifications in career and technical education programs and the workplace. In addition, the participants expressed a desire for students to start preparing earlier for their careers and be provided with alternatives to college for post-secondary education.

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Colonial Markets, Consumers, And Trade: A Comparative Analysis Of Historic Ceramics From The Bluefields Bay Area, Westmoreland, Jamaica, Lacy Risner Jan 2022

Colonial Markets, Consumers, And Trade: A Comparative Analysis Of Historic Ceramics From The Bluefields Bay Area, Westmoreland, Jamaica, Lacy Risner

Murray State Theses and Dissertations

The ceramic assemblages from a British colonial settlement in Bluefields Bay, Jamaica, provide a unique window into the market availability, exchange routes, and consumption patterns of the eighteenth century. This study compares the historic ceramics collected from two sites in Bluefields Bay to one another and to other intra-island (Jamaica), intraregional (Lesser Antilles), and international (North America) colonial and postcolonial sites to reveal patterns of individual and global ceramic consumption and distribution in the emergent capitalist networks and markets of the colonial era. Integrating small British colonial sites into the networks of other more extensive studies focusing primarily on plantations …

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Heterogeneous Oxidation Of Multi-Component Aqueous Organic Aerosols: The Effect Of Transport Phenomena And Reaction Compartment On Reaction Kinetics., Tadini Wenyika Masaya Jan 2022

Heterogeneous Oxidation Of Multi-Component Aqueous Organic Aerosols: The Effect Of Transport Phenomena And Reaction Compartment On Reaction Kinetics., Tadini Wenyika Masaya

Graduate Theses, Dissertations, and Problem Reports (ETD)

The surface-bulk partitioning of small organic molecules in aqueous droplets was investigated using molecular dynamics. The air-particle interface was modeled using a 80-Å cubic water box containing series of organic molecules and surrounded by gaseous OH radicals. The properties of the organic solutes within the interface and the water-bulk were examined at a molecular-level using density profiles and radial pair distribution functions. Molecules containing only polar functional groups such as urea and glucose are found predominantly in the water bulk, forming an exclusion layer near the water surface. Substitution of a single polar group by an alkyl group in sugars …

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