Digital Commons Network^™

Electrochemically-Modulated Surface Plasmon Waves At A Nano-Scale For Investigations And Applications Of Redox Assemblies., Aymen Hasan Qatamin

Electronic Theses and Dissertations

In this thesis, an electrochemically-modulated surface plasmon resonance (EC-SPR) technique was developed for challenging investigations and applications in different redox assemblies. The principle of the technique is based on the nano-scale confined and sensitive interplay between a surface plasmon wave and a redox-active probe featuring an optical transition when undergoing a faradaic redox process. Such faradaic process is electrochemically controlled by modulating the surface electric potential of the SPR platform to create an optical output signal that is substantially immune to the negative impacts of background environment and enabling the identification and quantification minute properties linked to a molecular event …

Marginal Methods And Software For Clustered Data With Cluster- And Group-Size Informativeness., Mary Elizabeth Gregg

Electronic Theses and Dissertations

Clustered data result when observations have some natural organizational association. In such data, cluster size is defined as the number of observations belonging to a cluster. A phenomenon termed informative cluster size (ICS) occurs when observation outcomes vary in a systematic way related to the cluster size. An additional form of informativeness, termed informative within-cluster group size (IWCGS), arises when the distribution of group-defining categorical covariates within clusters similarly carries information related to outcomes. Standard methods for the marginal analysis of clustered data can produce biased estimates and inference when data have informativeness. A reweighting methodology has been developed that …

Inventory Management Of The Refrigerator's Produce Bins Using Classification Algorithms And Hand Analysis., Sarah Virginia Morris

Electronic Theses and Dissertations

Tracking the inventory of one’s refrigerator has been a mission for consumers since the advent of the refrigerator. With the improvement of computer vision capabilities, automatic inventory systems are within reach. One inventory area with many potential benefits is the fresh food produce bins. The bins are a unique storage area due to their deep size. A user cannot easily see what is in the bins without opening the drawer. Produce items are also some of the quickest foods in the refrigerator to spoil, despite being temperature and humidity controlled to have the fruits and vegetables last longer. Allowing the …

Water Cluster Motifs In Structurally Similar N-(2-Aminoethyl)-1-Methylimidazole-2-Carboxamide Metal Complexes: Synthesis, Characterization, Thermal And Electrical Properties., Nina Saraei

Electronic Theses and Dissertations

Water is a remarkable molecule and in all of its forms exhibits an amazing collection of properties and functions. Besides its crucial role in life and many technological processes, water displays some unusual and anomalous properties at various interfaces and under different conditions. Although the role of hydrogen-bonding interactions and their fluctuations are well known to determine the properties of water, the main obstacle exists in the complexity of correctly describing the interactions between water molecules. The key to understanding the behavior of water is to collect precise structural data of various H-bonded water networks in diverse environments. In this …

Application Of Machine Learning Technologies For Detection Of Proximal Lesions In Intraoral Digital Images: In Vitro Study., Rohit Vadlamani

Electronic Theses and Dissertations

Background: Interpretation of bitewing radiographs is influenced by factors such as acquisition parameters (e.g. exposure, type of sensor), clinical technique, visualization (e.g. monitor type and calibration) and the observer (e.g. experience and fatigue bias). We hypothesized that the use of artificial intelligence (AI) will reduce visualization and observer factor in bitewing interpretation and improve diagnostic accuracy. Objective: The purpose of the present study was to evaluate the use of AI in the form of a machine-learning algorithm to detect and quantify proximal lesions compared with human trained observers. Methods: 16,000 anonymized, digital bitewings of patients were hand searched and non-bitewing, …

Search For New Physics Using Lepton Flavor Violating Signatures In Modern Particle Colliders., Atanu Pathak

Electronic Theses and Dissertations

Charged lepton flavor violation is a clear signal of new physics. Such decays are not allowed in the Standard Model but highly anticipated in a large class of new physics models. A direct search for lepton flavor violation in decays of the Higgs boson with the ATLAS detector at the LHC is presented here. The analysis is performed in the H → l tau channel, where the leading lepton (l) can be either an electron or a muon, and the tau lepton decays into an opposite flavored lighter lepton or via the hadronic decay channel. Published results of this search …

The Effects Of Different Set Configurations On Concentric Velocities In The Barbell Back Squat, Hanson Wong

Electronic Theses and Dissertations

The purpose of this study was to determine if concentric velocities of lighter loads of could be augmented if they are performed heavier working sets. Twelve trained males with experience in the barbell back squat performed a 5RM and completed two separate squat training session conditions that consisted of three sets of five repetitions with 85% of their 5RM. Both conditions differed in the placement of a reduced-load set that was either performed after the working sets or during the warm-up period. No significant differences were observed in the working set MCVs in both conditions. Additionally, no significant differences were …

Assessing The Impact Of Restored Wetlands On Bat Foraging Activity Over Nearby Farmland, Philip Allagas

Electronic Theses and Dissertations

Up to 87% of the world’s wetlands have been destroyed, considerably reducing ecosystem services these wetlands once provided. More recently, many wetlands are being restored in an attempt to regain their ecosystem service. This study seeks to determine the effects of restored wetlands on local bat habitat use. Bat activity was found to be significantly higher around the wetlands when compared to distant grassy fields; however, no significant difference was found among the restored wetlands and a remote cattle farm containing multiple water features. Geospatial models of bat distribution and bat foraging were produced using machine learning that showed higher …

Identifying Competencies And Outputs Of Sss Role In Stem Bridge Programs In The Silicon Valley, Alexandra C. Duran

Electronic Theses and Dissertations

This study identified the competencies and outputs associated with the role of student support specialists (SSS) in science, technology, engineering, or mathematics (STEM) bridge programs in the community colleges of Silicon Valley. The growth of STEM education, coupled with the increasing diversity of student population in community colleges, has made the work of SSS professionals in the region challenging. While the SSS professionals are often positioned as comprehensive, nonacademic support for STEM students, not enough has been documented on the competencies and outputs associated with SSS role in STEM bridge programs. In addition, most studies on student affairs professionals primarily …

The Relationship Between Exclusionary Discipline, Race, Socioeconomic Status, And Graduation Rates At 4a, 5a, And 6a High Schools, Ryan M. Cavazos

Electronic Theses and Dissertations

High school graduation is a significant predictor of future success. In most cases, a high school graduate will earn more money and live a healthier lifestyle than those who do not graduate from high school. The graduation rate in the United States is lower than the graduation rate of many other industrialized countries. Three known predictors of graduation rate are the number of exclusionary discipline assignments a student incurs, the race of the student, and the socioeconomic status of the student. The purpose of this study was to determine the relationship between graduation rate, exclusionary discipline, race (nonwhite), and low …

Academic Success And Curricular Structure: Exploring The Relationship Between Prerequisite Course Sequence And Grade Point Average In Community College Health Science Students, Patrick Carl Dupont

Electronic Theses and Dissertations

The current and ongoing shortage of healthcare professionals in the United States challenges educators and institutions to produce graduates of health professions programs in ever-increasing numbers. However, the current process typically used in community colleges is a cafeteria-style system of open enrollment, a model in which students pick courses from many choices without guidance or counseling. As a result, students often enroll in more advanced courses before taking the fundamental science courses. This may lead to poor performance, dropout, or failure. One potentially important variable in student success at a community college in the southwestern United States is student performance …

Underrepresentation Of Female And Minority Students In Science, Technology, Engineering, And Mathematics Academies In Texas, Darnisha Lanette Carreathers

Electronic Theses and Dissertations

Female and minority student groups are underrepresented in science, technology, engineering, and mathematics (STEM) programs and careers. Researchers have attributed this disparity to many factors; however, the primary factors are motivation and self-efficacy beliefs emerging during middle school. The purpose of this study was to examine why female and minority students enrolled and persisted in designated Texas-STEM academies by identifying themes related to Eccles’s expectancy-value model. In this qualitative case study, the researcher classified nine students from designated Texas Science, Technology, Engineering, and Mathematics (T-STEM) academies in a North Texas school district as persisters or nonpersisters. The researcher used interviews, …

Studies Of Quaternary Depositional Systems Of The Coastal Plain And Inner Continental Shelf Along The Georgia Bight: South Carolina And Georgia, U.S.A., Joshua H. Long

Electronic Theses and Dissertations

The Quaternary stratigraphy of the continental shelf offshore of South Carolina consists of stratigraphic units deposited in coastal plain, shallow marine, and shelfal environments bound by composite erosional surfaces that developed in response to numerous glacioeustatic cycles and overprinted by regional uplift. These units are commonly distributed laterally rather than stacked vertically, a function of the long-term, low shelf gradient and the resulting lack of accommodation. This study integrates high-resolution geological and geophysical data sets acquired offshore and onshore with existing data onshore into a comprehensive conceptual model describing the Quaternary geologic evolution of the coastal plain and continental shelf …

The Impact Of Texas Aim On Academic Performance In Detx, Nicoli Morgan

Electronic Theses and Dissertations

School- and community-based after-school programs have evolved within the last 10 to 14 years, to accommodate and reinforce primary education (Mahoney, Larson, Eccles, & Lord, 2005). Students who are enrolled in after-school programs (e.g., Boys and Girls Club, Solid Foundation) have made higher grades in the classroom than their same age/grade peers who are not enrolled in after-school programs (Fredricks, Hackett, & Bregman, 2010). Additionally, after-school programs increase students’ self-esteem and confidence (Fredricks et al., 2010). The Boys and Girls Club organization has a strong devotion to their members’ academic success in the school setting (“Boys and Girls Clubs of …

Chemostratigraphy Of Carbonate Gravity Flows Of The Wolfcamp Formation In Crockett County, Midland Basin, Texas, Alex Blizzard, Julie Bloxson

Electronic Theses and Dissertations

Sediment gravity flows into deep-water environments are important stratigraphic traps in lithologically diverse reservoirs generating multiple plays for hydrocarbon exploration. These highly heterogeneous deposits can be studied by utilizing chemostratigraphy and higher-order sequence stratigraphy; being an accurate method for reservoir characterization. Studying these gravity flows along a carbonate platform’s slope can further expand an understanding of the stratigraphy that is filling adjacent basins. The application of elemental analyses can support in identifying mineralogy that impact reservoir quality, especially when conventional testing cannot be applied.

This study utilizes five cores containing the Wolfcamp Formation from the southeastern slope of the Central …

Simulated Mine Land Reclamation Impact On Biomass Partitioning And Nutrient Contents In Loblolly Pine, Osarumen Egharevba

Electronic Theses and Dissertations

Forest productivity on reclaimed mine land is hindered by soil compaction. Different techniques have been used to alleviate the effect of compaction to various degrees of success. The Forestry Reclamation Approach (FRA) was developed in the Appalachians and has been used to improve forest productivity on reclaimed mines in this region. The FRA provides a step by step method designed to reduce compaction, control erosion, provide land stabilization and accelerate forest succession. This method had not been evaluated in the Gulf Coastal Plain, where the pan scraper reclamation method is commonly used. However, using pan scrapers increases mine soil compaction …

Development Of A Pharmaceutical Tablet Authentication System Using Spectroscopic Techniques In Combination With Multivariate Chemometric Methods, Md Nayeem Hossain

Electronic Theses and Dissertations

The spread of falsified drugs is increasing worldwide. Currently, 10%-30% of drugs in the world are falsified. Unfortunately, the supply chain system of developing countries (from manufacturers to customers) is not well monitored and suffers the highest rates of fraudulent activities. Also, the rise of product procurement from the internet increases the chance of American consumers' exposure to poor quality drugs. To combat this horrendous activity, surveillance of pharmaceutical materials is required in the supply chain system. Spectroscopic techniques (e.g., Near-Infrared and Raman spectroscopies) can be a potential solution to authenticate samples in different locations; they are non-destructive, safe, rapid, …

British Eugenics Failure And Success, Angela Gallagher

Electronic Theses and Dissertations

The historical narrative of eugenics often focuses on those eugenic societies and movements that ‘succeeded’ in part or in full in achieving a eugenic society. Less studied are those societies that failed, whether due to social backlash or internal incoherence. The British Eugenic Educational Society as the foundational point of eugenics, has therefore been overlooked as a result of it’s perceived lack of contribution to eugenic thought and its failure to pass eugenic legislation. Founded by Francis Galton, the originator of the philosophy of eugenics, the British Eugenic Educational Society should have been successful given it’s reputation and the numerous …

Pierre Hadot's Holistic Philosophy Of Communication, Jonathan Crist

Electronic Theses and Dissertations

Pierre Hadot’s holistic philosophy of communication attends to the health of the self and community through practice of spiritual exercises for the transformation of one’s entire being, working at the nexus of mind, body, soul, and cosmos. The task is ever-incomplete, works in an understanding of “human being as essentially an exposure that lacks a closed identity” and “keep[s] sight of the opening, wound, or lack that remains at the heart of any community and all communication” (Butchart 136). This is responsive to the present moment experiencing disjointed experience of time and space, increased anxiety, underdeveloped capacity for attention, and …

Characterization Of Photoacoustic Flow Cytometry Signals, Craig Benzinger

Electronic Theses and Dissertations

Photoacoustic flow cytometry has been utilized to clinically determine the presence of melanoma circulating tumor cells (CTCs). Further investigation was conducted into the morphology of detection signals and how they could be manipulated to allow for further classification. Novel features were extracted from waveforms that appear to have strong classification ability. Neural networks were also used to determine classification potential and the creation of feature mapping for future unsupervised classification. Detections were expanded from single waves to a time dependent multiwave event. Waveforms were also determined to be of non-parametric distribution, allowing for classification by neural network but not allowing …

The In/Authentic Subject: Kierkegaard, Heidegger, And Selfhood, Joseph Tighe

Electronic Theses and Dissertations

This dissertation represents an attempt to understand the self, what it is, what it means, and how it provides subjective identity. These concerns are situated within a personal narrative that describes the loss of self and its rediscovery subsequent to that loss. In critically examining the work of both Soren Kierkegaard and Martin Heidegger on the concept of authenticity, I have attempted to come to terms with my experience of the loss of selfhood as well as the conditions of possibility for its return. I argue that Kierkegaard’s construction of the self, while problematically religious, convincingly describes the experience of …

Using Tandem Mass Spectrometry And Irmpd Spectroscopy To Determine The Intrinsic Reactions Of Uranyl-Containing Ions, Irena Tatosian

Electronic Theses and Dissertations

Developing a comprehensive understanding of the intrinsic reactivity of uranium-containing species remains an important goal, as it may influence future developments in areas ranging from new approaches to nuclear fuel processing to studies of the migration and fate of the element in the environment. At a more fundamental level, such studies contribute to the understanding of the role that 5-f electrons may play in chemical bonding, the so called “f-electron challenge”. Electrospray ionization (ESI) is an effective way to generate gas-phase complexes containing uranium and uranyl ions for subsequent studies of intrinsic structure and reactivity. Studies in the gas-phase are …

Delineating Subsurface Karst Potential Using Electrical Resistivity In The Shell Mountain Province, Fort Hood Military Installation, Texas, Annie Robison

Electronic Theses and Dissertations

Fort Hood Military Installation is located within the Lampasas Cut Plain in Bell and Coryell counties, Texas, and is characterized by exposures of Lower Cretaceous Trinity and Fredericksburg Group carbonates. The Shell Mountain Province is an elevated plateau located in western Fort Hood utilized by the military for heavy mechanical (troop and wheeled) maneuver training and hosts significant surficial and subsurface karst. Ongoing karst inventories in western Fort Hood conducted by range managers have documented over 100 individual karst features. Recent studies utilizing LiDAR and remote sensing techniques delineated karst potential in this area and identified over 13,909 discrete depressions. …

Using Point Of View Video Modeling To Teach Math To Students With Autism Spectrum Disorder In Saudi Arabia, Hamad Hamdi

Electronic Theses and Dissertations

The utilization of academic skills plays a significant role in an individual’s function in society. For countries who are still developing an effective base of evidence-based practices, such as Saudi Arabia, single-subject research can be a powerful tool in discovering best practices for students with autism spectrum disorder (ASD). The purpose of this study was to determine the effectiveness of point-of-view video modeling (POVM) in improving the math skills (addition with regrouping) of elementary participants with ASD. A multiple baseline across participants design was used to examine the effectiveness of the intervention on each participant’s ability to solve two-digit by …

The Effects Of Teacher Professional Development And Self-Efficacy On Classroom Uses Of Information And Computer Technologies, Elif N. Gokbel

Electronic Theses and Dissertations

The uses of new technologies during mathematics instruction are essential for maintaining opportunities for students to gain better understanding of the content and become digital learners in the information age. Although scholars found technology integration is helpful in improving students’ mathematics achievement, the role of teachers’ preparedness for technology integration remains critical.

Technology professional development and self-efficacy are two major factors impacting teachers’ successful integration of instructional technologies. The purpose of this study was to provide a more in-depth look into (i) mathematics teachers technology uses during direct instruction, dialogic instruction, and assessment; (ii) the relationship between various types of …

N-Terminal Imine Derivatization For Enhanced De Novo Peptide Sequencing: A Study Of The Fragmentation Pattern Generated From Cid Of Peptide-Imines, Khiry L. Patterson

Electronic Theses and Dissertations

In this work, the fragmentation pattern derived from model peptides derivatized to create N-terminal imines (Schiff bases) were evaluated. Collision-induced dissociation of the protonated peptide-imines ([M+H]⁺) generally produced complete series of the sequence informative a_n and b_n ions, now undoubtedly characteristic of the peptide ion species. A novel product ion was also observed, denoted the y^ǂ ion, determined by IRMPD spectroscopy and density functional theory to be generated from the elimination of the N-terminal amino acid residue despite the N-terminal modification. It was concluded the pathway involved a nucleophilic attack by an amide nitrogen and …

An Investigation Of Technology Implementation Through The Lens Of Student Centered Learning And The Technological Pedagogical Content Knowledge Paradigm, Adam Wasilko

Electronic Theses and Dissertations

National statistics show that there are increases in access and availability of computers, and technology, in both the classroom and students’ personal lives (Culp et al. 2005, Hoffman & Ramirez, 2018). However, Tas (2017) and Wachira and Kenngwee (2010) posit that there is stagnation, even declines in certain cases, of the integration of instructional technologies in delivering student center learning in the classroom. This decline is even more prevalent in the science classroom (Vickrey, Golick, & Stains, 2018). Teachers face many challenges in the classroom; especially when technology integration is considered (Blackburn, 2016). This study seeks to determine which conditions …

The Problem Of Nature In The Phenomenology Of Merleau-Ponty, Alessio Rotundo

Electronic Theses and Dissertations

In my dissertation, I show that Merleau-Ponty’s idea of nature yields a double meaning: nature as ensemble of genetic and productive processes that are attainable in experience (phenomenal nature) and nature as that which enables this experience (transcendental nature). My thesis is that the two meanings of nature, when taken together, offer a guide to Merleau-Ponty’s final philosophical formulations about “flesh” and the “visible” and the “invisible.” The aim of the dissertation is to trace the salient conceptual and methodological complications entailed by this conception. I argue that the bivalence of the problem of nature in Merleau-Ponty receives a methodological …

Effects Of Warming On Decomposition Of Submerged Plant Litter And Associated Microorganisms In Streamside Channels, Kaity Ackerman

Electronic Theses and Dissertations

Surface air temperatures are predicted to increase in the near future, which will likely affect microbial activity and carbon flow in stream ecosystems. I performed an experiment in streamside channels at Coweeta Hydrological Laboratory, NC to assess responses of litter-associated microorganisms to moderate increases in water temperature (5 levels, ambient to +4°C). The objectives of the experiment were to determine: (1) if there are differences in the magnitude of responses to temperature among various microbial parameters and (2) whether microbial responses to temperature vary among plant litter of different carbon quality. Thus, I measured litter decomposition rate, fungal biomass (ergosterol), …

The Role Of Slc7a11 In Controlling Extracellular And Intracellular Redox Environments Of Lung Fibroblasts - Potential Targets For Intervention In Aging And Idiopathic Pulmonary Fibrosis., Yuxuan Zheng

Electronic Theses and Dissertations

Idiopathic pulmonary fibrosis (IPF) is a fatal lung disease characterized by extracellular matrix deposition by fibroblasts. Aging and oxidative stress increase the susceptibility to IPF. Redox couples, cysteine/cystine (Cys/CySS) and glutathione/glutathione disulfide (GSH/GSSG), and their redox potentials (E_h) quantify oxidative stress. Fibroblasts from old mice maintain more oxidized extracellular E_h(Cys/CySS) than young mice. Microarray shows down-regulation of Slc7a11 potentially mediates this age-related oxidation. Slc7a11 is the key component of system X_c^-, an antiporter that imports CySS and exports glutamate. The first aim of this dissertation is to investigate the mechanistic link between Slc7a11 …