Digital Commons Network^™

Precise Landing Of Vtol Uavs Using A Tether, Jeremy W. Rathjen

Graduate Theses, Dissertations, and Problem Reports (ETD)

Unmanned Aerial Vehicles (UAVs), also known as drones, are often considered the solution to complex robotics problems. The significant freedom to explore an environment is a major reason why UAVs are a popular choice for automated solutions. UAVs, however, have a very limited flight time due to the low capacity and weight ratio of current batteries. One way to extend the vehicles' flight time is to use a tether to provide power from external batteries, generators on the ground, or another vehicle. Attaching a tether to a vehicle may constrain its navigation but it may also create some opportunities for …

Student Understanding Of The Definite Integral When Solving Calculus Volume Problems, Krista Bresock

Graduate Theses, Dissertations, and Problem Reports (ETD)

The concept of integration appears in many different scientific fields, and students’ understanding of and ability to use the definite integral in applications is important to success in their STEM (science, technology, engineering, and mathematics) classes. One of the first types of application problems that students encounter is finding the volume of a solid using the definite integral. How students approach these problems and how they use the definite integral to find volumes can have an impact on their future use and understanding of the definite integral.

This study involves a deep and thorough investigation of how ten students understand …

Considering "Machine Testimony": The Impact Of Facial Recognition Software On Eyewitness Identifications, Valena Beety

Articles by Maurer Faculty

This Article uses a wrongful conviction lens to compare identifications by machines, notably facial recognition software, with identifications by humans. The Article advocates for greater reliability checks on both before use against a criminal defendant. The Article examines the cascading influence of facial recognition software on eyewitness identifications themselves and the related potential for greater errors. As a solution, the Article advocates the inclusion of eyewitness identification in the Organization of Scientific Area Committees' ("OSAC") review of facial recognition software for a more robust examination and consideration of software and its usage. The Article also encourages police departments to adopt …

System Development Of An Unmanned Ground Vehicle And Implementation Of An Autonomous Navigation Module In A Mine Environment, Jonas Amoama Bredu Jnr

Graduate Theses, Dissertations, and Problem Reports (ETD)

There are numerous benefits to the insights gained from the exploration and exploitation of underground mines. There are also great risks and challenges involved, such as accidents that have claimed many lives. To avoid these accidents, inspections of the large mines were carried out by the miners, which is not always economically feasible and puts the safety of the inspectors at risk. Despite the progress in the development of robotic systems, autonomous navigation, localization and mapping algorithms, these environments remain particularly demanding for these systems. The successful implementation of the autonomous unmanned system will allow mine workers to autonomously determine …

The Dances Of Diplomacy: French Social Dance Culture In The United States, 1780-1800, Kaylar Gina Moser

Graduate Theses, Dissertations, and Problem Reports (ETD)

This thesis explores how social dancing in the United States formed a noteworthy aspect of political, diplomatic, social, and class exchange for U.S. elites both domestically and overseas; and how the cultural dominance over dance that France enjoyed during this period created an informal cultural diplomatic relationship between the United States and France in the 1780s and the 1790s. I argue that U.S. elites utilized this dance culture as a form of upper-class status legitimation that could serve diplomatic purposes. This project increases the purview of U.S. cultural diplomatic studies by centering on the eighteenth century and by utilizing an …

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 …

Living On The Edge: Trans* Exclusion, Survival, And Resistance, Rayna E. Momen

Graduate Theses, Dissertations, and Problem Reports (ETD)

ABSTRACT

This dissertation focuses on the criminalization and victimization of transgender people, broadly defined as people whose gender identity does not align with their assigned birth sex, using a queer criminological and intersectional lens. The introduction offers background and context for this examination, and includes the purpose, theoretical approach, methodology, research questions, contributions, and overviews of the substantive chapters. Chapter two explores what we know and what we do not know about transgender people’s pathways into the criminal legal system, how they experience state surveillance, and how they navigate the system. Chapter three explores violence against transgender people in various …

Noise Exposure Trends Among Violating Coal Mines, 2000 To 2021, Hanna Grace Davis

Graduate Theses, Dissertations, and Problem Reports (ETD)

Noise-induced hearing loss has continued to be a significant issue within the mining industry, even after the passing of the MSHA’s improved noise standard in 2000. NIOSH has recognized that the noise standard enacted by both MSHA and OSHA does not properly protect workers with the 5 dBA exchange rate (i.e., the increase in noise level leading to a doubling of energy) and the lack of emphasizing the use of engineering controls over administrative controls and overreliance on hearing protection device usage. The primary objective of this study is to investigate statistical sound relationships between MSHA noise-related violations and samples …

Microwave Enhanced Electron Energy Distribution Functions, John Samuel Mckee

Graduate Theses, Dissertations, and Problem Reports (ETD)

The use of two (or more) radio frequency (RF) sources at different frequencies is a common technique in the plasma processing industry to control ion energy characteristics separately from plasma generation. A similar approach is presented here with the focus on modifying the electron population in argon and helium plasmas. The plasma is generated by a helicon source at a frequency f0 = 13.56 MHz. Microwaves of frequency f1 = 2.45 GHz are then injected into the helicon source chamber perpendicular to the background magnetic field. The microwaves damp on the electrons via R-mode (anti-parallel to the background magnetic field …

Exploration Of Intercollegiate Student-Athletes’ Athletic Identity, Leah C. Oldham

Graduate Theses, Dissertations, and Problem Reports (ETD)

Student-athletes encounter experiences that can cause their identity process and self-concept to be disturbed. Even though athletic identities are strong among intercollegiate athletes, some encounter identity-threatening events that interrupt their identity process, negatively affecting their athletic identity. The present study adds to current research on the athletic identity of student-athletes by examining the athletic identity and self-esteem of student-athletes to determine if a redshirt season is a positive (identity-enhancing) or negative (identity-threatening) event. The intersectionality of age, race, gender, and ethnicity are examined to understand if multiple identities influence the experience of a redshirt season. Results reveal that a redshirt …

The Impact Of Formation And Fracture Properties Alternations On The Productivity Of The Multi-Stage Fractured Marcellus Shale Horizontal Wells., Dalal Aldbayan

Graduate Theses, Dissertations, and Problem Reports (ETD)

As the reservoir deplete, the pore pressure decreases and the effective stress increases. The increase in the effective stress results in the formation compaction which can alter the formation and hydraulic fracture properties. This is particularly significant for a Marcellus shale horizontal well with multi-stage hydraulic fracture due to low Young's modulus and moderate Poisson's ratio of the Marcellus shale. The degree of the effective stress increase depends on the initial productivity of the well, which is influenced by the hydraulic fracture properties, formation properties, as well as the operating conditions. Therefore, it is necessary to couple the geomechanical and …

Characterizing Locomotor Disturbance Perception In Young Adults, Daniel James Liss

Graduate Theses, Dissertations, and Problem Reports (ETD)

Falls during walking are a leading cause of injuries across aging. Many of these falls are due to slips and trips. The ability to perceive disturbances to ongoing motion may play an important role in the control of walking balance. However, disturbance perception has been investigated in standing balance, but its role in walking balance due to slip- and trip-like disturbances remains largely unknown. Characterizing locomotor disturbance perception in young adults may lead to a more comprehensive understanding of sensorimotor walking balance control.

This work defined locomotor disturbance perception in response to slip and trip-like disturbances in young adults. We …

Aerodynamic Analysis Of Damage State Missiles Using Overset Meshing Techniques For Application To Computational Fluid Dynamics Simulation, Jonathan A. D'Alessio

Graduate Theses, Dissertations, and Problem Reports (ETD)

Significant research over the years has aimed to redefine the flight capabilities of aircraft after sustaining structural damage to critical components. Flight survivability and controllability are key areas of concern when designing fault-tolerant flight control systems to handle a wide range of potential scenarios. However, there is a lack of research on the impact of physically damaged missile systems. Missile counter-defense and intercept capabilities have become more advanced as the United States has focused heavily on these areas over the years. Damaged missiles due to a kinetic intercept capability present an opportunity for analysis of the post-damage implications on flight …

Evaluating Potential Soil Amendments And Geomorphic Methods For Mine Land Reclamation, Amanda Rodrigues Silva

Graduate Theses, Dissertations, and Problem Reports (ETD)

The United States has approximately 22% of the world’s coal reserves. Since 1961, the electric power sector has been the major user of coal in the U.S., accounting for 91.9% of the coal consumed in the country in 2021. Sixty-two percent of total U.S. coal production in 2021 was sourced from surface mining, and Wyoming, West Virginia, Pennsylvania, Illinois, and Montana were responsible for 74% of this total production.

Coal-mining activities expose sulfide minerals in rocks that, when in contact with oxidizing conditions, produce sulfate-rich drainage known as acid mine drainage (AMD). AMD treatment typically involves chemical treatments to raise …

Roles And Responsibilities Of A Coach Developer In A Youth Soccer Setting In The United States, Christina Ann Villalon

Graduate Theses, Dissertations, and Problem Reports (ETD)

Although coaching has a long history guided in the apprenticeship or mentorship model (Taylor & Garratt, 2013), research has primarily focused on the athlete, rarely on the coach, and almost never on whom the coach is serving as an apprentice to, or being mentored or supported by. Internationally, this role has been termed a ‘coach developer,’ but the formalized title and role of the coach developer is still a rather new concept (ICCE, 2014), with most research focused on the coach developer working at elite levels. Therefore, the purpose of this study was to explore the roles and responsibilities of …

Improving Robotic Decision-Making In Unmodeled Situations, Nicholas Scott Ohi

Graduate Theses, Dissertations, and Problem Reports (ETD)

Existing methods of autonomous robotic decision-making are often fragile when faced with inaccurate or incompletely modeled distributions of uncertainty, also known as ambiguity. While decision-making under ambiguity is a field of study that has been gaining interest, many existing methods tend to be computationally challenging, require many assumptions about the nature of the problem, and often require much prior knowledge. Therefore, they do not scale well to complex real-world problems where fulfilling all of these requirements is often impractical if not impossible. The research described in this dissertation investigates novel approaches to robotic decision-making strategies which are resilient to …

Modeling Of Inverter-Based Microgrid For Small-Signal And Large-Signal Stability Analysis, Vishal Verma

Graduate Theses, Dissertations, and Problem Reports (ETD)

Integration of inverter-based resources (IBRs) such as solar photovoltaic, wind, and battery storage, is both a boon and a bane for electric power systems. On one hand, IBRs have helped in making electrical energy a clean (carbon-free) source of energy. On other hand, the dynamics of IBRs have changed the way power system studies have been carried out. With the advantages IBRs offer over conventional resources, it is assumed that a small distribution power system (microgrid) will have a 100% IBRs penetration in the future. Such a microgrid can operate in grid-connected mode or in an islanded mode. Both modes …

Wetland Mitigation Performance Standards: The Intersection Of Science, Practice, And Policy, Jessica Anne Bryzek

Graduate Theses, Dissertations, and Problem Reports (ETD)

Wetland ecosystem spatial extent and integrity have declined due to conversion to anthropogenic land uses. Wetland mitigation offsets the impact on wetlands encountered during development by restoring a previously degraded wetland or creating new wetlands. This activity creates an ecosystem service market where wetland impacts (debits) are offset by wetland restoration/creation (credits). Mitigation aims to replace functions provided by aquatic resources lost during development. Post-restoration monitoring criteria known as performance standards are used to evaluate and verify restored wetland functionality and regulate mitigation credit release. Therefore, performance standards are vital in ascertaining wetland restoration techniques and mitigation processes. In Chapter …

Understanding Vaccine-Induced Memory Responses To Develop The Next Generation Of Pertussis Vaccines, Kelly L. Weaver

Graduate Theses, Dissertations, and Problem Reports (ETD)

Bordetella pertussis is a Gram-negative respiratory pathogen that can infect individuals of all ages and is notably responsible for infant fatalities. Pertussis (whooping cough) is a vaccine-preventable respiratory disease for which vaccines have been available in the United States since the 1940s. Whole cell pertussis vaccines kept incidence of pertussis under 5,000 cases per year, but were associated with reactogenicity issues. Following the introduction of less reactogenic acellular pertussis vaccines in the late 1990s, there have been noteworthy outbreaks of pertussis. For example, in 2012 there were over 50,000 reported cases of pertussis and 20 deaths in the U.S. The …

An Action Research Evaluation Of An Online Inclusive Sport Peer Coach Training, Margaret Roberts Condon

Graduate Theses, Dissertations, and Problem Reports (ETD)

Background: Trained peer tutors are a proven pedagogical technique that can help eliminate barriers to inclusion in physical education and extracurricular sport, including a reported lack of training and experience of professionals. When adequately trained, peer tutors can encourage social interactions, provide constant feedback, and increase active learning and engagement. While recommendations for training peer tutors have been provided, there are currently no known studies examining a peer tutor training in an online format for middle and high school-aged students participating in an inclusive sport program.

Purpose: The purpose of this study was to evaluate the effectiveness of an …

Modeling And Optimization Of A Novel Chilled Ammonia Absorption Process And Amine-Appended Metal-Organic Frameworks For Co2 Capture, Ryan Keith Hughes

Graduate Theses, Dissertations, and Problem Reports (ETD)

Post-combustion capture is one of the leading technologies for CO₂ abatement from anthropogenic sources which have contributed significantly to the rise of atmospheric greenhouse gases. Specifically, solvent-based capture post-combustion processes are the industry standard but can suffer drawbacks such as high energy penalties and corrosion. In this work, two possible improvements are investigated which have been recently proposed in the literature. The first is aqueous ammonia as a capture solvent which has been shown to have several advantages including, but not limited to, a lower regeneration energy. The second is a novel solid sorbent, an amine-appended metal-organic framework (MOF). …

Bacterial Contamination In Public Atac-Seq Data And Alignment-Free Detection Methods, Drake Michael Aesoph

Graduate Theses, Dissertations, and Problem Reports (ETD)

ATAC-seq is a new high-throughput sequencing technology for measuring chromatin accessibility within genomic samples. It can be used to discover new information about open regions, nucleosome positions, transcription factor binding sites, and DNA methylation. It is especially useful when combined with other next-generation sequencing techniques, such as RNA-seq. Unlike previous technologies, however, ATAC-seq is more sensitive to bacterial contamination, which is a well-known problem in cell cultures that can lead to incorrect experimental results. Previous studies have measured the contamination in public RNA-seq data and found that 5%- 10% of samples were contaminated. In this report, we investigate the prevalence …

Polarization Properties Of Millisecond Pulsars: Astrophysical Interpretations And Applications, Haley Megan Wahl

Graduate Theses, Dissertations, and Problem Reports (ETD)

Pulsars are some of the most extreme objects in the universe; their small yet incredibly predictable spin periods coupled with their strong magnetic fields make them ideal laboratories for study. Not only are they interesting objects themselves, but they can also help us probe different astrophysical environments, such as the interstellar magnetic field and the solar corona.

These stars are highly polarized, and that polarization comes into play in various fields of pulsar physics (such as constraining models of pulsar emission), but obtaining that polarization information can be difficult, as the polarization properties of the light can change as the …

Stationary Solutions And Stability Of Constant Equilibrium Solutions For A Chemotaxis System, Awatif Ramadan Zawali

Graduate Theses, Dissertations, and Problem Reports (ETD)

We consider a one-dimensional Chemotaxis model describing the dynamics of the cell density n, cell velocity u, chemoattractant c1, and chemorepellent c2, respectively. The model is related to angiogenesis in cancer cells. n represents the cell density of the vessel, the chemoattractant c1 is vascular endothelial growth factor (VEGF) and the chemorepellent c2 is the antiangiogenic drug. We study the existence of a nonconstant steady-state solution using the singular perturbation method. We also provide numerical examples of steady-state solutions for the fast system to illustrate the idea. For the dynamical problem in part II, we study the stability of constant …

A Novel Tool To Promote Surgical Team Awareness Of Nurse Anesthesia Students’ Level Of Training, Joseph Lewis Britz

Graduate Theses, Dissertations, and Problem Reports (ETD)

Background: Communication errors in operating room (OR) settings are a common and avoidable source of patient harm. Communication in OR settings is enhanced when all members of the surgical team have knowledge of the skills and proficiency of their fellow team members. Student registered nurse anesthetists (SRNAs) provide anesthesia under the supervision of a certified registered nurse anesthetist (CRNA) or physician anesthesiologist. SRNAs’ proficiency in delivering anesthesia can vary significantly depending on their level of training, which varies based on the progression of the student in their multi-year nurse anesthesia program. Methods: This quality improvement project implemented a standardized non-verbal …

Ear Biometrics: A Comprehensive Study Of Taxonomy, Detection, And Recognition Methods, Susan Awm El-Naggar

Graduate Theses, Dissertations, and Problem Reports (ETD)

Due to the recent challenges in access control, surveillance and security, there is an increased need for efficient human authentication solutions. Ear recognition is an appealing choice to identify individuals in controlled or challenging environments. The outer part of the ear demonstrates high discriminative information across individuals and has shown to be robust for recognition. In addition, the data acquisition procedure is contactless, non-intrusive, and covert. This work focuses on using ear images for human authentication in visible and thermal spectrums. We perform a systematic study of the ear features and propose a taxonomy for them. Also, we investigate the …

Electronic Structure Of Early Transition Metal Complexes Supported By Pyridine Polypyrrolide Ligands, Dylan Connor Leary

Graduate Theses, Dissertations, and Problem Reports (ETD)

A thorough study of photoluminescent molecules involving the pyridine polypyrrole(ide) ligand platform has been conducted. A detailed analysis on speciation of the proligand H₂(^MesPDP^Ph) (H₂^MesPDP^Ph = 2,6-bis(5-mesityl-3-phenyl-1H-pyrrol-2-yl)-pyridine) and its dilithium salt Li₂(^MesPDP^Ph) revealed temperature- and solvent-dependent effects. These molecules, along with the hydrochloric acid adduct [H₃(^MesPDP^Ph)]Cl were found to exhibit short-lived photoluminescence in both tetrahydrofuran and benzene solution. These findings confirm the hypothesis that heavy-atom involvement is crucial for the favorable photophysical properties observed for the Zr(PDP)_{2 …}

Love At First Profile: An Experiment Exploring If Previously Incarcerated Individuals Are Less Desirable While Online Dating, Carina L. Perrone

Graduate Theses, Dissertations, and Problem Reports (ETD)

Incarceration is a rapidly increasing occurrence in the United States with more than 1.4 million people incarcerated and more than 2 million on some form of restricted confinement. While men are incarcerated at a much higher rate than women, women are still at a steady incline of incarceration as well. Also, people of color disproportionately make up a large number of those incarcerated while accounting for a small percentage of the general population. Previous research on people who have been incarcerated focuses on it affects education, employment, and marriage. Little research has attempted to explore how incarceration effects dating, a …

The Relationship Between Oral Health And Health-Related Quality Of Life Among Hemodialysis Patients In Rural West Virginia, Kimberly A. Wallace

Graduate Theses, Dissertations, and Problem Reports (ETD)

Introduction: Approximately 786,000 Americans are currently diagnosed with end-stage renal disease, 71% of whom are undergoing hemodialysis (HD) treatment. There is a bidirectional relationship between chronic kidney disease and periodontal disease. Among HD patients, poor oral health is prominent and can negatively impact general health and health-related quality of life. Appalachian residents experience extreme health and poverty inequities and limited access to healthcare and dental providers.

Method: The study was designed based on the Andersen Behavioral Model of Health Services Use. 120 participants from 6 outpatient HD centers were enrolled. Data were collected using a 34-item questionnaire including oral health …

Comparison Of Maintenance Cost Of Medium And Heavy-Duty Alternative Fuel And Diesel Vehicles, Isaac C. Boyce

Graduate Theses, Dissertations, and Problem Reports (ETD)

Abstract

Comparison of Maintenance Cost of Medium and Heavy-Duty Alternative Fuel and Diesel Vehicles

Isaac Boyce

This study was conducted to provide an in-depth analysis of the differences in maintenance cost with the use of alternative fuel and diesel in medium (MD) and heavy-duty (HD) vehicles. With the push toward lower emissions from transportation vehicles for a cleaner future, the United States of America (US) has incentivized the conversion from the use of conventional fossil fuel, diesel, to lower carbon alternatives. With the increased potential for the use of alternative fuels, an investigation is warranted to understand the differences. This …