Digital Commons Network^™

Determining Variable Depth To Bedrock Using Ert And Masw: A Geophysical Investigation In St. Louis, Mo, Justin James Clinton

Masters Theses

“The research involves a geophysical study in the Maremec River Valley in St. Louis County, Missouri. The geophysical methods described in this paper can provide a relatively quick, inexpensive, and accurate means in investigating the lithologic characteristics of the subsurface. Method selection is ultimately dependent of the type of investigation and site-specific characteristics. In this investigation, Electrical Resistivity Tomography (ERT) data and Mutli-Channel Analysis of Surface Waves (MASW) data were acquired to image the bedrock beneath the Maremec River to an approximate depth of 110 ft or an elevation of 300 ft for a proposed wastewater tunnel. Two overlapping dipole-dipole …

On The Investigation Of Hot Tearing Behavior Of Continuous Cast Steel, Yanru Lu

Masters Theses

”Hot tearing has long been recognized as a major problem that plagues the development of the continuous casting process and results in low-quality products. Understanding of the mechanisms and the required conditions for the hot tearing formation is important for industries but has not been well-established yet. Thus, this research focuses on the hot tearing issue observed in continuous cast steel, by providing a summary of the current research progress and then introducing a new laboratory method to determine the thermo-mechanical properties relevant to hot tearing of different steel grades under different solidification conditions. In this method, an apparatus was …

Performance Evaluation Of Alsi10mg Fabricated By A Selective Laser Melting Process, David Michael Murphy

Masters Theses

“Selective laser melting is becoming a widely used additive manufacturing technique that melts metal powder in a layer by layer process in order to build a desired part or geometry. Like many additive processes, selective laser melting allows for fabrication of parts with complex geometries. In order to fabricate a fully dense part there are a number of variables to take into account including: powder characteristics, laser parameters, and environmental parameters. Each of these variables can affect the microstructure and thus the mechanical performance of an additively manufactured part. In this work, the aluminum alloy AlSi10Mg was investigated. AlSi10Mg is …

Combining Laser Aided Ablation And Polishing To Minimize Surface Roughness Of Additively Manufactured Aluminium Components, Sahil Bipinkumar Patel

Masters Theses

“The surface roughness of additively manufactured parts is much higher than the acceptable range for most applications, thus post-processing is needed to qualify these parts for use. Laser polishing can be used to bring the surface roughness in an admissible range, but if the initial roughness is very high then the energy density for the polishing process needs to be very high to achieve a significant reduction in roughness. This high energy density can produce many process defects. Also, laser polishing alone cannot get rid of high wavelength asperities. Any waviness in the part can be linked with initial waviness …

Modeling And Control Of Cascaded Bridgeless Multilevel Rectifier Under Unbalanced Load Conditions, Sai Hemanth Kankanala

Masters Theses

“The goal of this project is to model and control a novel unidirectional cascaded multilevel bridgeless rectifier as an active front end in medium and high voltage applications. This topology has many advantages over a conventional cascaded H-bridge rectifier, such as lower implementation cost, higher reliability, and greater flexibility with similar power quality. The complete design process of the proposed converter is developed step by step in order to meet all the desired objectives. The steady-state mathematical model is used to develop a method for the voltage balancing of dc cells. Power factor analysis is discussed to mathematically derive requirements …

The Application Of Machine Learning Models In The Concussion Diagnosis Process, Sujit Subhash

Masters Theses

“Concussions represent a growing health concern and are challenging to diagnose and manage. Roughly four million concussions are diagnosed every year in the United States. Although research into the application of advanced metrics such as neuroimages and blood biomarkers has shown promise, they are yet to be implemented at a clinical level due to cost and reliability concerns. Therefore, concussion diagnosis is still reliant on clinical evaluations of symptoms, balance, and neurocognitive status and function. The lack of a universal threshold on these assessments makes the diagnosis process entirely reliant on a physician’s interpretation of these assessment scores. This study …

Quantifying Effects Of Sleep Deprivation On Cognitive Performance, Quang Nghia Le

Masters Theses

“The most commonly used metric for evaluating alertness and vigilance is the Psychomotor Vigilance Test (PVT), previous studies have indicated that alertness and vigilance can be affected by the lack of sleep as a function of sleep loss. This study explores methods to predict median psychomotor vigilance reaction times. The data used in this study comes from a series of tests and surveys conducted on volunteer students. The data set contains many potential predictors of PVT and one aspect of the study was to identify variables that are useful in prediction. The performances of various prediction methods that allow for …

Design And Comparison Of Unoptimized And Optimized Gray Code Multi-Level Systems, Shirly Adams Gamliel

Masters Theses

“As the conventional binary MOS-based VLSI technology is reaching limitations in chip area, speed, and power, new technologies are being researched. Some such technologies relate to multi-level logic design. This thesis explores the process and benefits of applying and optimizing multi-level design techniques to an existing Gray code binary system. Specifically, the multi-level system is designed using CoreMem technology and is optimized using Indira Dugganapally’s optimization techniques.

The first step is generating the n-bit binary and quaternary truth tables for an encoder’s Gray code output and additional desired data. Then, the data for each n-bit system is arranged in multi-level …

Modal Analysis As Non-Destructive Testing Technique For Additively Manufactured 304l Stainless Steel Parts, Tristan N. Cullom

Masters Theses

“Non-Destructive Testing (NDT) methods for Additively Manufactured (AM) parts is an ongoing field of research in the additive community due to its ability to determine if a part can be deemed viable for field usage. This study presents modal analysis as a NDT method for AM parts. For production builds that have multiple copies of the same part, a correcting technique can be used such that the frequencies of the parts under test can be reliably compared against each other, which saves both time and money compared to other traditional NDT methods. This study was able to develop a novel …

Creating Alabama Music Heritage And Theory: Equipping Students With State Pride Through Effective Curriculum, Julianne Rae Mattox

Masters Theses

Across general music curricula, there is always a concern for student interest. For elementary age students, music is viewed as magical and fun. It seems that as students age, if they are not in band, music begins to lose some of its magic. With any class, student interest and involvement is key for the academic success of the curriculum. If students have to take a class that they do not want to take, they automatically lose interest. It is important for teachers to present their curriculum to students in a way that grabs their attention and allows them to enjoy …

Portable Electrochemical System For Flexible Hybrid Electronics, Anthony Joseph Hanson

Masters Theses

This work focuses on the fabrication and design of a portable electrochemical sensing system for flexible hybrid electronic (FHE) sensors. A three-electrode chemical sensor was fabricated using copper tape on polyethylene terephthalate (PET) substrate, using laser etching process. An electronic circuit was designed to measure the sensor response through electrochemical techniques to detect different concentrations of glucose. The device was calibrated to give the user a concentration value in 5 seconds. The system was also designed to preform tests such as cyclic voltammogram and chronoamperogram for various chemicals. A Bluetooth Low Energy module was used to wirelessly transmit the results …

A Wrinkle In Autism Literature: An Analysis Of Madeleine L’Engle’S A Wrinkle In Time And Hope Larson’S A Wrinkle In Time: The Graphic Novel, Marla Larson

Masters Theses

This literature review will examine Madeleine L’Engle’s classic intermediate novel A Wrinkle in Time, and Hope Larson’s A Wrinkle in Time: The Graphic Novel. Medical scholarship regarding autism, comics scholarship, and comments from online contributors are used to describe how a comparison of these two texts can provide positive representation of autism in literature. Consideration for how these texts can be used together in the Language Arts classroom to develop the comprehension skills of students on the spectrum is also considered. This thesis first examines the character Charles Wallace in L’Engle’s original text and how he represents a positive presentation …

Electrodermal Activity During Dissonant Music In Musicians And Non-Musicians, Joshua Chapin

Masters Theses

The purpose of this study was to investigate the subjective emotional and physiological responses to consonant and dissonant music excerpts in musicians and non-musicians. Participants were assigned to one of two groups, high experience (HE) or low experience (LE) based on their level of music experience and education. Participants from both groups listened to the same set of randomized musical excerpts half of which were consonant and half of which were dissonant. Participants self-reported ratings of perceived pleasantness, as well as Electromyography (EMG) and Electrodermal Activity (EDA) data were collected. Average Skin Conductance Responses (SCR) were averaged over all trials …

Radio Direction Finding Using Pseudo-Doppler For Uav-Based Animal Tracking, Anup Karki

Masters Theses

Radio Direction Finding (RDF) is commonly used for low cost tracking and navigation systems. However, for a low cost application and mobility, the design constraints are highly limited. Pseudo Doppler (PD) can improve RDF capabilities without being cost prohibitive. This work entails the analysis of PD RDF and its potential use for Unmanned Aerial Vehicles (UAV) that are currently employed in wildlife research animal tracking. PD is based on the doppler effect or doppler shift. The doppler effect works like a frequency modulator that increases or decreases the observed frequency depending on whether a signal source is approaching or receding …

Modeling And Improvement Of Electronic Waste Collection System: Case Study At Grand Valley State University, Quang Tran Nhat Nguyen

Masters Theses

Accelerated and advanced development of the electronics industry in the 21st century is creating the rapid obsolescence of electrical and electronic equipment. This causes one of the largest and unstoppable waste streams called electronic waste (e-waste). There have been obstacles in e-waste recycling, including the existence of the informal sector such as peddlers (a larger issue in developing countries) and insufficient consumer awareness. The ideal e-waste recycling system would be able to overcome these obstacles. To establish an effective e-waste recycling system, the first important step is to implement an e-waste collection system. To implement an e-waste collection system, many …

The Implementation Of Qpcr Beach Monitoring Methods: Analysis Of A Multi-Lab Validation Study And The Role Of Environmental Parameters On A Comparison Of Colilert And Qpcr Methods, Molly J. Lane

Masters Theses

Public beaches are routinely tested for potentially pathogenic bacteria to protect beachgoers from possible illness. An EPA approved method, Colilert™, used for testing E. coli in recreational water requires 18 – 22 hours before a result is reported but, recreators have already contacted unsafe water before the beach is closed. My study focused on a U.S. EPA proposed qPCR method (Draft Method C) to quantify E. coli in recreational waters that can provide same-day results. In Chapter 2, I examined the calibration procedure used to validate Draft Method C and compared standard curve intercept and slope estimates calculated with a …

Impacts Of Shoreline Restoration And Source Of Nutrient Enrichment On Macrophytes And Epiphytic Algal Communities, Paige Marie Kleindl

Masters Theses

Macrophytes and their epiphytic algal communities are integral for optimizing littoral ecosystem functioning in lakes. Epiphytic algae’s placement on the plant’s surface can reduce light and nutrient availability (i.e., nitrogen and phosphorus) for the host macrophyte. Macrophyte and epiphytic algal proximity complicates these primary producer group interactions and responses to bioavailable nutrients in the water column or porewater. For example, epiphytic algae may have a competitive advantage over surface water nutrients compared to macrophytes, which may have a competitive advantage over porewater nutrients via root systems.

Muskegon Lake’s industrial history and designation as an Area of Concern prompted shoreline restoration, …

Functional Analysis In The Home Setting Of An Older Adult With Neurocognitive Disorder, Emily Norton

Masters Theses

Currently within the behavioral gerontology literature there are no published studies that include a functional assessment in the home setting. The primary goal of the present study was to address this gap by conducting a functional analysis on a challenging behavior of an older adult with neurocognitive disorder in the home. This study occurred in two phases. During phase one, researchers conducted an antecedent functional analysis on the bizarre speech of an 81-year-old female with suspected dementia across four conditions (television on, no interactions initiated; television on, interactions initiated; television off, no interactions initiated; television off, interactions initiated). Results from …

The Grand Narrative Worldview: A Narrative Inquiry Into The Impact Of Biblical Metanarrative Teaching In Liberty University’S School Of Divinity Global Studies Program, Chesed Anne Dent

Masters Theses

There is limited research and literature on the effectiveness of narrative-centered academic learning environments that utilize biblical metanarrative as a tool for teaching. Literature exists showing that story is an effective tool within education, within discipleship, and within training for cross-cultural effectiveness. This narrative inquiry research study focused on Liberty University’s Global Studies Program, a program that overlaps these distinct areas into one platform. Global Studies uses the power of story through the Grand Narrative of Scripture to teach students academic content, equip them as messengers of God’s Story, and help them assess and understand their own narratives within a …

Assessing The Impact Of 3d Printed Terrain On Teaching Topography In Introductory Earth Science Labs, Jay Alan Cockrell

Masters Theses

Learning to effectively read topographic maps is challenging for students, as these maps contain 3D representations of terrain displayed on a 2D surface map. This project assessed student learning when 3D terrain printed from a portion of the laboratory quadrangle map currently in use was introduced into an earth science course for non-science majors. Using a quasi-experimental design with nonequivalent groups across two semesters, performance on the Modified Topographic Map Assessment (MTMA) administered as a pre- and posttest was used to compare learning outcomes between the traditional lab and the 3D print lab intervention. Students in the traditional (n = …

An Evaluation Of Unmanned Aerial Systems And Structure-From-Motion For Fluvial Large Wood Sensing And Risk Assessment, Daniel Gerke

Masters Theses

This research aims to show Unmanned Aerial System (UAS) and Structure-from-Motion (SfM) technology can, in combination, improve on traditional large wood (LW) monitoring techniques. More temporally and economically efficient data collected at a finer spatial resolution and greater spatial extent will increase the effectiveness of management plans and risk assessment for LW by providing decision-makers with a complete picture of the river.

Contemporary practices are too inefficient in time and labor for large-scale monitoring of fluvial LW with anything more than the most general management or risk assessment in mind. The paradigm of river research, the river continuum concept (RCC), …

Extending The Capabilities Of Von Neumann With A Dataflow Sub-Isa, Martin Cowley

Masters Theses

Instruction set architectures (ISAs) such as x86, ARM, and RISC-V follow the control flow model of computation, where a program is defined as a sequence of instructions. Early processors executed instructions one-by-one based on the control flow of a program. Dataflow is an alternative model of computation that uses the availability of data to drive instruction execution. Any instruction can be chosen for execution, independent of the instruction order, as long as the data is available for that instruction. While modern processors incorporate concepts of the dataflow model in the microarchitecture, the implementation of the ISA, the amount of instruction …

Estimation Of The Fatigue Life Of Additively Manufactured Metallic Components Using Modified Strain Life Parameters Based On Surface Roughness, Peter Grohs

Masters Theses

In this study, a method is developed to estimate the effects of surface roughness on the fatigue life of additively manufactured titanium Ti6Al4V, aluminum 7075–T6, and steel 4340 alloys through modified strain life parameters using finite element analysis (FEA). This method is highly beneficial to the fatigue analysis of as-built additively manufactured metal components, which possess rough surfaces that reduce fatigue life significantly but are challenging to analyze directly using finite element simulation because of complex geometries, i.e., modeling an exact surface profile is arduous.

An effective stress concentration factor, incorporating roughness data, is defined to quantify their effects on …

Reconsidering ‘Soul And Body Ii’: Who Is Culpable For Their Combined Fate?, Sarah Jaran

Masters Theses

Soul and Body II has been considered for many years by scholars to be a less doctrinally complex poem compared to later versions of the topos. Superficially, the poem seems to blame the body fully for the shared doomed fate of the body and soul because the majority of the poem is a speech by the soul claiming that much. I propose in this study, however, that the poet created a dual message for the audience of Soul and Body II. While the easy and more superficial message is that the body is at fault for the damnation of …

Analysis Of Advance Placement Distance Of The Gateway In-Street Sign On Increased Yielding Distance, Joshua Turske

Masters Theses

The National Highway Traffic Safety Association (2018) reported approximately 6,000 pedestrians were fatally injured by vehicles in 2016, with an increasing trend in fatalities over the past decade. The gateway configuration of In-Street signs has been shown to produce an increase in the percentage of drivers yielding right-of-way to pedestrians; this study examined at what distance in advance of the gateway the configuration was most effective in inducing drivers to yield right of way further in advance of the crosswalk. This study also counterbalanced time of day across placement distances. Data were collected on all vehicles that passed through the …

The Theological Implications Of Κατάπαυσίν And Σαββατισμὸς In Hebrews 3:7–4:11, Sean M. Best

Masters Theses

This thesis will argue that rest in Hebrews is entering into humanity’s rightful place, ruling over creation with God, in the full image of God, as intended by God since the seventh day. Rest in the book of Hebrews is a vitally important theme. The word for rest in Greek is κατάπαυσίν and is used eight times in Hebrews 3–4. The definition of rest determines the crux of understanding the warning passage by the author of Hebrews. The basic lexical definition of this word is “rest” or “resting place.” While a basic gloss of the Greek term κατάπαυσίν is easy …

Is There A Need For Restoration Of Justice In Democratic India?, Abraham Sekhar

Masters Theses

Justice means giving all persons their due. Justice is the quality of being fair and reasonable. India has the largest democracy in the world. It has become noticed globally by most other countries, on the one hand, for its significant economic growth during the past two decades; and on the other hand, for its domestic unrest among people of different religions and castes. Under the rule of the present political party, India’s economic growth has experienced a sudden decline during the past three years. This drew my attention to find out the reasons for such a decline. A literature survey, …

Modern Conducting: An Exhibition Of Traditional And Commercial Conducting, Mark Edward Mcdowell

Masters Theses

From the 20th century onward, there has been many notable musical and technological developments. These developments have led to the formation of new musical genres and commercial ensembles. The new genres and commercial ensembles have pertinent implications for modern conductors. In addition to traditional forms such as instrumental, choral, and mixed ensembles, modern conductors must be aware of the unique characteristics of the new commercial ensembles. These new ensembles include the film scoring stage, the jazz ensemble, and the worship ensemble. In addition to utilizing the fundamental concepts of traditional conducting, modern conductors must also attain a working knowledge of …

The Philosophical Underpinnings And Negative Consequences Of The Indian Child Welfare Act, Elizabeth Sharon Morris

Masters Theses

This paper will examine the philosophical underpinnings of current federal Indian policy and its physical, emotional, and economic consequences on individuals and communities. The U.S. Civil Rights Commission found in 1990 that “[T]he Government of the United States has failed to provide civil rights protection for Native Americans living on reservations” (W. B. Allen 1990, 2). As Regan (2014) observes, individuals have been denied full title to their property – and thus use of the property as leverage to improve their economic condition (Regan 2014). Tribal executive and judicial branches have been accused of illegal search and seizures, denial of …

Ethical Implications Of Codis, Lucy Grogan

Masters Theses

CODIS stores and maintains numerous DNA profiles, and is used as a tool by the criminal justice system in order to help solve crime. Deoxyribonucleic Acid, or DNA for short, is the genetic material that an individual inherits from one’s parents (NIH, 2019). Certain portions of this genetic material are selected for use within the CODIS database due to their lack of medically relevant information. There is an immense amount of power associated with DNA and the CODIS database that it is held within, which allows for many ethical issues to arise. In order to create a usable and safe …