Digital Commons Network^™

Nanodiamonds And Carbon Nano-Onions Ceramic Composites And Their Applications, Ibrahim Munkaila Abdullahi

Masters Theses

"Luminescent nanodiamonds are photostable non-blinking fluorescent biocompatible, non-toxic, functional Zable materials made from high-pressure high temperature (HPHT) microcrystalline diamonds. For long, the scientific community has been investigating for a clean, efficient and cost-effective technique to reduce the size of fluorescent microcrystalline diamond into nanodiamonds. Their color center, responsible for the fluorescent properties are crucial for their applications, including biomedical imaging, nano sensing, quantum computing etc, and therefore should not be affected significantly by the method of size reduction applied. A novel size reduction technique that is based on explosive fragmentation was developed and the corresponding fragmented diamonds obtained were characterized …

Serdes Channel Crosstalk Mitigation Methodology With Industrial Implementation Guidance, Junda Wang

Masters Theses

"With the increasing data rate of digital circuits, the differential crosstalk degrades the signal integrity performance in PCBs drastically. Usually, in the trace area, crosstalk can be isolated by stitching vias and adding shielding ground vias can also shield coupling in the ball gate array (BGA) and pin field area. The traditional way to mitigation crosstalk in the BGA and pin field area through adding more ground vias between signal pairs or increasing the spacing in between, it demonstrated us the efficiency on crosstalk cancellation efficiency but it also increases the size of products and it would be contradictory to …

Prediction Of Crack Propagation In Zrb₂-Carbon Based Composites Using The Extended Finite Element Method, Leiren Danielle Jarvis

Masters Theses

“The ultra-high temperature ceramic, zirconium diboride (ZrB₂) has long been researched for applications in extreme environments. Its high strength (> 400 MPa) and thermal conductivity (> 100 W/m•K) make it a candidate for use in hypersonic fight, but a low fracture toughness (< 3 MPa•m^1/2) limits this use. In order to increase the fracture toughness without compromising the strength and thermal conductivity, experimental research has focused on the viability of engineered architectures using multiple materials to create a macrostructure. These architectures allow for the increase of fracture toughness thru crack deflection in the material.

Two architectures in particular, …

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 …

Influence Of Input Energy On Mechanical Properties Of Laser Powder Bed Fused Aisi 304l Stainless Steel, Tan Pan

Masters Theses

“Powder Bed Fusion process with selective laser melting technique is popularly adopted in additive manufacturing area on account of its layer by layer manufacturing fashion capable of fabricating components with complex internal and external geometries and structures. However, the process-property map is unique and vital for different materials and AM configurations used for fabrication. The process parameter is identified as a significant factor that heavily influences the properties and performances of the printed materials.

Current work aimed to extend the existing knowledge on Laser Powder Bed Fusion fabricated AISI 304L by accessing the influence of varying energy input on the …

Games For Organizational Training: Gamer Motivation Profile And Organizational Training Climate Effect Of Trainee Preference For Gamified Training, Brooke-Nicole Woods Ruffin

Masters Theses

“Gamified training is often utilized in organizations as a way to revamp their training and gain the attention of their employees. However, this training is expensive, and research is needed to help ensure that this training delivery is successful. In this study, first an individual’s gamer motivation profile is compared with learning outcomes that share the same elements. This was completed to determine if the elements that they looked for in playing video games were in alignment with those same elements in training In addition, it was explored whether the preference for participating in video games based on an individual’s …

Microgel Placement And Plugging Performance In Sand Filled Fracture For Conformance Control, Baihua Lin

Masters Theses

“Preformed particle gels (PPG) has been widely applied for conformance control in heterogeneous reservoirs with fractures and super-K channels. As a plugging agent, PPG could plug the fractures or high permeability streaks and divert the displacing fluid into low permeability matrix. Many studies have been conducted to investigate the potential of PPGs as a water cut reduction and improved oil recovery agent using homogeneous sandpacks or heterogeneous core samples with man-made open fractures. However, no research has been carried out to understand how PPG injection and plugging performance will be changed if the fractures are filled with sands. Herein, the …

Micro-Analysis Of Contaminants In Suspended Load And Bank Deposits From The Mineral Fork Creek Watershed In Potosi, Missouri, 2019-2020, William Joseph Miller

Masters Theses

”There are rising concerns pertaining to water contamination produced by toxic heavy metal contaminants such as lead and zinc. For this study, lead, zinc, and barite are three identified contaminants currently threatening Missouri water supplies. A microanalysis of the amounts of lead, zinc, and barite in the water of Mineral Fork Creek was conducted, involving both field and laboratory work. The purpose of the study was to determine the levels of lead, zinc, and barite contaminants, contributing to Big River, by Mineral Fork Creek, in Potosi Missouri, Washington County.

This research study uses a quantitative micro-analysis approach to determine the …

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 …

Strain Partitioning Across The Polochic-Motagua Fault System In Guatemala: Insight From Kinematic Modeling, Qiaoqi Sun

Masters Theses

”The Polochic-Motagua Fault System in Guatemala is the on-land segment of the sinistral transform plate boundary between the North American Plate and the Caribbean Plate. Three major seismically active strike-slip faults in this fault system pose significant earthquake threats to surrounding populated cities. The assessment of seismic hazard requires a better understanding of the kinematics of the fault system. GPS monitoring indicates that seventy-five percent of the ~20 mm/yr. plate motion is accommodated by the Motagua Fault and less than twenty-five percent is accommodated by the Polochic Fault. However, the Polochic Fault documents a lateral offset of ~132 ± 5 …

Mineral Compositions Of Meteorite Samples Alha 77005, Nwa 7397, Nwa 5480, And Ausson: Implications For Geodynamic Processes On Their Parent Bodies And Meteorite Reclassification, Kaylin Agnata Tunnell

Masters Theses

“This study investigates the major, minor, and trace element compositions of minerals from a series of meteorites which represent different stages of planetary evolution including two sample from Mars (ALHA 77005 and NWA 7397), one sample from Vesta (NWA 5480), and one ordinary chondrite (Ausson). The goal of this study is to investigate if petrogenetic tracers commonly employed to understand terrestrial samples can also be applied to extraterrestrial samples. The data presented here show that mineral trace element data allow for novel insight into the magmatic history of meteorite samples. For example, V/Sc and Fe/Mn ratios in olivine provide insight …

Development Of Amine-Functionalized Mesoporous Alumina For Radioiodine Removal From Water, Mansour Mohammed Alsalbokh

Masters Theses

“Radioactive materials have spread due to careless disposal and nuclear disasters. Some radionuclides can exist in an aqueous media, like radioactive iodine. As a result, in this work amine-functionalized mesoporous alumina was developed to adsorb radioactive iodine from the liquid phase. Bismuth was incorporated, using a wet impregnation method, to test it as a possible silver replacement. Amine grafting was used to functionalize the surface of the mesoporous alumina. All materials prepared in this work were characterized by N₂ physisorption, FTIR and TGA to determine the textural properties, surface functionality, and amine loading. The synthesized materials were tested for …

Additive Manufacturing Of Linear Shaped Charges To Address Run Up And Run Down Phenomena, Jason Ho

Masters Theses

”A shaped charge is an explosive device used to focus detonation energy in a desired direction. Additive Manufacturing (AM) can allow greater design freedom and geometric complexity for the liner portion of the shaped charge.

In this work, the following hypotheses were tested: 1) Adjusting the initial apex angle of a linear shaped charge liner reduces the amount of run up that occurs, and 2) implementing a backstop at the end of a linear shaped charge liner reduces the amount of run down that occurs.

Linear shaped charge liners with a continuously changing apex angle were created with additive manufacturing. …

Mid-Infrared Chiral Metsurface Coupling With Molecular Vibration, Md Shamim Mahmud

Masters Theses

“The mid-infrared design of chiral metamaterial shows a tremendous absorption capability of infrared rays, and it has the significant application of circular dichroism based device development. Plasmon-phonon coupling is one of the application of metamaterial that provides a new path for tailoring the surface in the nanoscale, which is also applicable in molecules detection. It is possible to change the Plasmon-Phonon coupling strength not only through the chemical change of molecules but also by changing the metamaterial light-matter interaction property. So far, linearly polarized light shows the strong coupling between metamaterial and molecules. However, it is possible to observe strong …

Feasibility Study On Novel Fire-Resistant Coating Materials, Anyou Zhu

Masters Theses

“Over the past decades, wildfires in the United States have caused severe damage and property losses. The California Camp Fire in November 2018 caused 85 civilian fatalities and destroyed 18,793 structures. There is a need to enhance the fire resistance of structures and buildings. The primary purpose of this study was to develop innovative surface-bonded fire-resistant material that can be used as a wall coating with three primary features: (a) workability for application, (b) enough adhesion to the surface of the structure, (c) fire-resistant. This research developed mix designs of innovative fire-resistant coating materials including high-performance cement mortar (HPCM), geopolymer …

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 …

An Intricate Ensemble : The Art-Science Of An Ecological Imaginary For The Anthropocene Epoch, Alyce Santoro

Masters Theses

The contradictions inherent in European Enlightenment-based “logics” that externalize humans from “nature” were a concern for the Romantic Naturalists, Dadaists, and Surrealists. More recently, some in the environmental humanities and socio-ecologically-concerned arts and sciences have also posed challenges to anthropocentric, hierarchical, positivist modes of thought. I suggest that by engaging the ludic, imaginative, and collaborative while bearing the empirical in mind, dualisms (such as objective and subjective, individual and collective) dissipate, and existence as a dialectical state of intricate ensemble can be revealed. In light of catastrophic disruption to Earth’s life-sustaining processes by exploitative forms of human activity, I argue …

左興萬, Hsing Wan Tso: Against The Current, Deryka D. Tso

Masters Theses

This literary biography tells the story of Hsing Wan Tso, a Chinese man who chose to act counter to the conventions of his culture, and his granddaughter, a writer learning what it means to defend his legacy.

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 …

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 …

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 …

The Use Of Music Therapy Towards Social Development In Children With Disabilities: A Rapid Review, Yuanyuan Bai

Masters Theses

Across the world, many music therapists serve children with disabilities in private practice and school settings. Although some clinical research for music therapy as a validated approach to facilitate social deficits is available, it is still limited. This study is focused on a rapid review of using music therapy towards social development in children with disabilities. Also explored is the researcher’s self-awareness of what was learned from the study and how these lessons may be transferred to future clinical work. The study's findings may also help music therapy professionals better understand (a) what aspects of social behavior music therapists tend …

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 …

Free Spirit Meets Gilded Cage: Betty Ford As Second Lady 1973-1974, Caroline Marie Dickey

Masters Theses

Betty Ford has a rich legacy as a pioneer and trailblazer, but her transition into politics was far from smooth. 1973-1974, or her time as Second Lady, was a critical training ground that solidified her beliefs and character for the rest of her life in the spotlight.

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, …

A Study Analyzing The Correlation Between One’S Knowledge Of The Myers-Briggs Type Indicator (Mbti) And The Chaplain’S Ministry Resiliency, Johnie Preston Joyce Ii

Masters Theses

Military Chaplains are at an increased risk for professional burnout and there is a need to improve the training that is provided to prepare them for occupational burnout and compassion fatigue. This study analyzes the effect that the chaplain’s knowledge of the Myers-Briggs Type Indicator (MBTI) has on his or her ministry resiliency. The purpose of this study is to discover if there is a correlation between the military chaplain’s level of resilience and his or her knowledge of the Myers-Briggs Type Indicator. Literature on, compassion fatigue, ministry burnout, military chaplaincy, chaplaincy resiliency, personality testing, and the Myers-Briggs Type Indicator …