Digital Commons Network^™

Spectrally Equivalent Matrix Polynomials: Non-Standard Representations And Preservation Of Structure, Vasilije Perovic

Dissertations

Abstract attached as separate file.

Energy, Angular And Charge Deposition Dependence Of Electron Transmission Through Insulating Polyethylene Terephthalate Nanocapillaries For Narrow Beam Production, Darshika Keerthisinghe

Dissertations

This study analyzes the characteristic properties of electron transmission with incident energies of 300, 500 and 800 eV for the production of nanometer-sized beams through insulating polyethylene terephthalate (PET) nanocapillaries. More specifically, it investigates the transmission for very small tilt angles near zero degrees with the small step sizes revealing distinct regions of behavior, angular dependence, energy and the charge deposition dependence on transmission. Results were obtained for two Samples, 1 and 2, with different capillary diameters (100/200 nm) and pore densities (5 x 10⁸ /5 x 10⁷ /cm²), respectively, with the same foil thickness 12 …

Blind Source Separation For Feature Detection And Segmentation In Ground Penetrating Radar (Gpr) Lmaging Of Concrete Bridge Decks For Nondestructive Condition Assessment, Vincent Krause

Dissertations

Concrete bridge decks require periodic condition assessment and preventive maintenance to extend their useful lifespan. Nondestructive evaluation methods such as Ground Penetrating Radar (GPR) are slowly beginning to replace or complement the manual (visual) assessment of bridge conditions for detecting defects at their early stages. However, GPR scans of bridge decks are frequently cluttered with high amplitude reflections from known parts of the bridge deck, which make the detection of defects’ low amplitude reflections difficult. One such known part is the embedded steel reinforcement bars known as rebar.

This dissertation presents a novel approach to the automated detection of defects …

Uganda Science Teacher Educator: A Concurrent Mixed Methods Investigation Of Nature Of Science, Pedagogy And Classroom Learning Environment Perspectives, Robert Elisha Musookho Kagumba

Dissertations

This study investigates the perspectives of Uganda science teacher educators on three areas foundational to science education reforms: Nature of science, preferred science pedagogy and classroom learning environment. Uganda has embraced science education reforms but classroom science teachers struggle to implement them. Could these struggles be attributed to their science teacher educators’ perspectives? Using a concurrent mixed method design, the study profiles the views of 63 science teacher educators in Uganda.

Data were collected using four instruments: Student Understanding of Science and Scientific Inquiry, Pedagogy of Science Teaching Test, Views of Nature of Science survey and Constructivist Classroom Learning Environment …

The Relationship Between Students’ Applied Mathematics Skills And Students’ Attitudes Towards Mathematics, Taylor Andrew Kilman

Dissertations

Mathematics is a subject with which many students struggle. It has been noted that students’ attitudes towards mathematics can often affect their performance in related courses. The goal of this research is to explore the relationship between students’ basic applied mathematics skill and students’ attitudes towards mathematics. That is, do students, as they learn how to use mathematics in the real world, tend to develop a more favorable outlook towards mathematics? Or, on the other hand, do the attitudes towards mathematics of students remain unaffected as their ability to use mathematics in the real world increases? The current research seeks …

Novel Spectroscopic Tools To Differentiate Molecule-Dna Binding Interactions, Sense Dna And Track Dna Melting, Saad Hmoud Alotaibi

Dissertations

The discovery of DNA as a genetic material and its double helical structure led to numerous studies directed at understanding molecule-DNA interactions. These studies have played an integral role in medical diagnostics, forensics, imaging and therapeutics. Typically, molecule-DNA interactions have two prominent modes: intercalation and minor groove binding. Several optical techniques are available that can monitor molecule-DNA binding interactions, but they cannot differentiate between intercalation and minor-groove binding. The major goals of the research are to develop novel optical spectroscopic tools that can differentiate molecule-DNA binding interactions, selectively and sensitively detect one form of DNA over another, and track DNA …

Comparing Slug Test Methods For Unconfined Aquifers, Hussain Jaber Alfaifi

Dissertations

Slug test methods are used to determine in situ aquifer hydraulic conductivity (K) more quickly and economically than a pump test can. This study compares slug test methods for unconfined aquifers, looking at how to conduct a test using a physical slug, and at different analysis methods including Bouwer and Rice (1976), Kansas Geological Survey (KGS 1994), Hvorslev (1951) and Dagan (1978). Questions that motivated this study include: How well does the Bouwer and Rice method work? What is the most effective way to conduct a slug test? Does using a large physical slug relative to the well diameter and …

Failing To Replicate: Hypothesis Testing As A Crucial Key To Make Direct Replications More Credible And Predictable, Pedro Fernando Mateu Bullón

Dissertations

Theory cannot be fully validated unless the original results have been replicated, resulting in conclusion consistency. Replications are the strongest source to verify research findings and knowledge claims. Sciences such as medicine, chemistry, physics, genetics, and biology, are considered successful because their knowledge claims are buttressed by a large set of replications of original studies. Unfortunately in the social sciences many attempts to replicate fail and thus there is a continuing need for replication studies to confirm facts, expand knowledge to gain new understanding, and verify hypotheses. Two plausible explanations for the failure to replicate in the social sciences could …

Three Essays On Panel Data Estimation, Alexander Houser

Dissertations

This work discusses various aspects of panel data estimation. In chapter one, an algorithm for semiparametric random effects estimation is proposed. The performance of bootstrap-based confidence intervals for the proposed estimators are examined and found reasonable. The algorithm is also applied to a set of U.S. state level medical expenditure data to estimate the medical Engel curve. In the second chapter, the predictive performance of various parametric and semiparametric panel data estimators is compared on the same dataset of U.S. state level medical expenditures as well as out of sample forecast performance and bootstrap bias-corrected mean square errors of the …

Factors Influencing Academic Engagement And Achievement: Exploration Of Impact Of Parentification And Poverty In Adolescents’ Student-Teacher Relationships, Nontle Nako

Dissertations

Parentification is the highest form of Adultification; a phenomenon that occurs when some children precociously perform extensive labor in their families, often as a function of poverty, and when their roles, responsibilities, and behaviors are “out of synch” with contemporary social and institutional notions of what children are expected to do (Burton, 2007). Based on the hypothesis that a significant number of children growing up in economically disadvantaged family backgrounds have higher chances of taking on adult roles at a young age and become adultified to a level of being parentified; this study sought to investigate whether and how school-based …

Comparison Of Item Response Theory Models For Data Fit Of Quality Control Measurements For Maillard Reaction Browning In Foods, Polly Barrett

Dissertations

In foods, browning is a complex set of reactions known as the Maillard Reaction (MR). As food is cooked, MR yields flavor, color and changes to the chemical properties of the initial food item. It is possible to undercook or overcook the food item, resulting in a less browned or burnt product. Item response theory (IRT) is often used to place subjects and instruments on the same continuum of the measured latent trait. IRT has been widely used in the fields of educational measurement and psychology, but few studies combine IRT and food science. This research tested IRT modeling for …

A National Study Of Alternatively And Traditionally Certified Teachers, John F. Hoye

Dissertations

The alternative teacher certification policy has been firmly in place for more than a decade, but there have been conflicting reports on its effects. I conducted the study to investigate whether the policy has materialized its promise. I compared the characteristics of alternatively certified (AC) and traditionally certified (TC) teachers by analyzing data from a nationally representative sample of public school teachers (N = 27,810). The sample was constructed from the Schools and Staffing Survey 2007-08, a national survey conducted by the National Center for Education Statistics. I investigated what teacher characteristics (such as age, gender, ethnicity, total years of …

Using Dynamic Lndicators Of Basic Early Literacy Skills (Dibels) Oral Reading Fluency Data To Predict Michigan Educational Assessment Program Outcomes, Lisa Lockman

Dissertations

Schools are under legislative pressure to ensure students make adequate progress each year, and therefore, must identify students in need of intervention at early grade levels. Educators use diagnostic tools to measure student progress, attempting to determine which children may be most at risk for future reading failure. The Dynamic Indicators of Early Literacy Skills (DIBELS) is widely used for early identification of students who have risk factors. This study incorporated a quantitative, correlational, ex post facto design to examine the relationship between students’ third grade scores on the spring DIBELS Oral Reading Fluency (ORF) assessment and their fifth grade …

Phantom Maps, Decomposability, And Spaces Meeting Particular Finiteness Conditions, James Schwass

Dissertations

The purpose of this dissertation is to extend principles for detecting the existence of essential phantom maps into spaces meeting particular finiteness conditions. Zabrodsky shows that a space Y having the homotopy type of a finite CW complex is the target of essential phantom maps if and only if Y has a nontrivial rational homology group. We show this observation holds on the collection of finite generalized CW complexes. Similarly, Iriye shows a finite-type, simply connected suspension space is the target of essential phantom maps if and only if it has a nontrivial rational homology group. We show this observation …

Redesign Program For Community College Developmental Education Students: Learning Through The Sense Of Belonging, Elizabeth Jk James

Dissertations

No abstract provided.

Joint Models Of Longitudinal Outcomes And Informative Time, Jangdong Seo

Dissertations

No abstract provided.

School Climate And The Latino-White Achievement Gap, Rachael R. Leavitt

Dissertations

No abstract provided.

Testing For Two Signals With Unknown Locations In Functional Magnetic Resonance Images Using Gaussian Random Field: A Monte Carlo Simulation Study, Pei-Chin Lu

Dissertations

No abstract provided.

Moving College Students To A Better Understanding Of Substrate Specificity Of Enzymes Through Utilizing Multimedia Pre-Training And An Interactive Enzyme Model, Mounir R. Saleh

Dissertations

Scientists’ progress in understanding enzyme specificity uncovered a complex natural phenomenon. However, not all of the currently available biology textbooks seem to be up to date on this progress. Students’ understanding of how enzymes work is a core requirement in biochemistry and biology tertiary education. Nevertheless, current pre-college science education does not provide students with enough biochemical background to enable them to understand complex material such as this. To bridge this gap, a multimedia pre-training presentation was prepared to fuel the learner’s prior knowledge with discrete facts necessary to understand the presented concept. This treatment is also known to manage …

Developmental Education At The Community College: An Exploration Of Instructional Best Practices And The Relationship Between Integration, Student Involvement And Rates Of Completion, Beverly Gayle Strickland Lewis

Dissertations

The purpose of this study was to explore the developmental education process within the community college system in Mississippi. Tinto’s (1993) Integration Theory and Astin’s (1993) Theory of Student Involvement were employed as a framework to assess and understand the relationship between academic integration, social integration, student involvement, and rates of completion.

This concurrent mixed method study identified best practices related to the successful completion of developmental education courses from the vantage point of the faulty and administration at the community college. A total of ten faculty and administrators from five of the community colleges in Mississippi were given a …

Rebel Yale: Yale Graduates And Progressive Ideals At The University Of Mississippi Law School, 1946-1970, Jennifer Paul Anderson

Dissertations

The University of Mississippi School of Law (Ole Miss Law) was the fourth public law school founded in the United States. The school was established to prevent men from leaving the state for legal education due to fears that they were being indoctrinated by eastern schools where ideologies were not consistent with those of Mississippi. One hundred years after her founding, Ole Miss Law entered into a period of turbulence as race and politics clashed on campus. From the time of the Brown decision through the Civil Rights Era, the deans and law professors at the law school were subjected …

Secure And Reliable Routing Protocol For Transmission Data In Wireless Sensor Mesh Networks, Nooh Adel Bany Muhammad

Dissertations

Abstract

Sensor nodes collect data from the physical world then exchange it until it reaches the intended destination. This information can be sensitive, such as battlefield surveillance. Therefore, providing secure and continuous data transmissions among sensor nodes in wireless network environments is crucial. Wireless sensor networks (WSN) have limited resources, limited computation capabilities, and the exchange of data through the air and deployment in accessible areas makes the energy, security, and routing major concerns in WSN. In this research we are looking at security issues for the above reasons. WSN is susceptible to malicious activities such as hacking and physical …

Improved Monitoring Of The Changjiang River Plume In The East China Sea During The Monsoon Season Using Satellite Borne L-Band Radiometers, Bumjun Kil

Dissertations

Measurement of sea surface salinity (SSS) from Satellite borne L-band (1.4 GHz, 21cm) radiometers (NASA Aquarius/SAC-D and ESA SMOS) in the East China Sea (ECS) is challenging due to the uncertainty of SSS caused by land thermal emissions in the antenna side lobes and because of strong radio frequency interference (RFI) due to illegally emitted man-made sources. RFI contamination in the ECS has gradually decreased because of the on-going international efforts to eliminate broadcasts in the protected L-band radio-astronomy frequency band. The present dissertation focuses on carefully eliminating the remaining RFI contamination in retrieved SSS, and masking out regions close …

Aqueous Raft Polymerization Of Glycopolymers For Peptide Interaction Studies And Antimicrobial Peptide Mimics For Antimicrobial Activity And Selectivity Studies, Sarah Elizabeth Exley

Dissertations

The first section of this work describes the synthesis and characterization of novel glycopolymers synthesized to model GM1 gangliosides, a glycolipid found in neuronal cells. Glucose and galactose were attached to N-hydroxyethyl acrylamide, using chemistry that granted control over the stereochemistry at the C1’ carbon of each saccharide, and polymerized via aqueous RAFT (aRAFT). Homopolymers, targeting either 30 or 300 DP, and copolymers, with N-dimethyl acrylamide, were prepared as a glycopolymer platform for investigation of amyloid β (Aβ), a naturally occurring peptide associated with Alzheimer’s disease, aggregation. Aβ aggregation kinetics and aggregate size in the presence of glycopolymer were determined. …

A Partial Replication Load Balancing Technique For Distributed Data As A Service On The Cloud, Klaithem Saeed Al Nuaimi

Dissertations

Data as a service (DaaS) is an important model on the Cloud, as DaaS provides clients with different types of large files and data sets in fields like finance, science, health, geography, astronomy, and many others. This includes all types of files with varying sizes from a few kilobytes to hundreds of terabytes. DaaS can be implemented and provided using multiple data centers located at different locations and usually connected via the Internet. When data is provided using multiple data centers it is referred to as distributed DaaS. DaaS providers must ensure that their services are fast, reliable, and efficient. …

Scalable Multi-Hop Data Dissemination In Vehicular Ad Hoc Networks, Moumena Abdullah Chaqfeh

Dissertations

Vehicular Ad hoc Networks (VANETs) aim at improving road safety and travel comfort, by providing self-organizing environments to disseminate traffic data, without requiring fixed infrastructure or centralized administration. Since traffic data is of public interest and usually benefit a group of users rather than a specific individual, it is more appropriate to rely on broadcasting for data dissemination in VANETs. However, broadcasting under dense networks suffers from high percentage of data redundancy that wastes the limited radio channel bandwidth. Moreover, packet collisions may lead to the broadcast storm problem when large number of vehicles in the same vicinity rebroadcast nearly …

Gal: A Stepwise Model For Automated Cloud Shadow Detection In Hico Oceanic Imagery Utilizing Guided Filter, Pixel Assignment, And Geometric Linking, Jennerpher Renee Meyers

Dissertations

Detection of cloud shadow pixels is an important step in image processing in several remote sensing ocean-color application domains, such as obtaining chlorophyll content. While shadow detection algorithms do exist, the vast majority are for over land which leaves few options for detection over water.

The detection of cloud shadow over water in HICO imagery is a unique problem. As its name implies, HICO (Hyperspectral Imager for the Coastal Ocean) imagery is produced for coastal and oceanic regions. Since land based algorithms remove water before processing, these approaches would not be applicable. The only currently published HICO shadow pixel detection …

Selective Detection Of Volatile Organic Compounds Using Metal Oxide Sensor Arrays, Anton Dmitrievich Netchaev

Dissertations

Selective detection of organic contaminant using widely available and inexpensive metal oxide sensors has the potential to be used in various robotic platforms for navigation, harmful chemical leak detection, mobile environmental monitoring, etc. Selective gas detection in real world environments using easily available sensors has not been reported and can be used in many industries. A sensor system using only four commercially available sensors with accompanying signal conditioning and clustering algorithm capable of discriminatory detection of chemical marker is possible. Tests have shown that temperature, humidity and concentration fluctuations can be accounted for to produce systems for real world environments. …

Psappha By Iannis Xenakis: Developing Multiple Percussion Literacy, Owen Phillip Rockwell

Dissertations

Psappha by Iannis Xenakis was written for a solo percussionist in 1975, and since then has been performed almost exclusively by elite musicians. The work suffers from broad neglect by students and professionals alike, because the structure and notation are difficult to access. Through Psappha, Xenakis created an alternative approach to serialist and chance compositional techniques that enabled him to communicate what he believed was rhythm in its purest form. The notation is unconventional and challenges the performer to approach Psappha in a similar manner. The main thrust of this project was to re-imagine the work in a more …

A Mixed Method Study Of The Effectiveness Of Gaining Early Awareness And Readiness For Undergraduate Programs (Gear Up) Federal Incentive Program In Southern Mississippi Public Secondary Schools, David Micah Maxwell

Dissertations

The Gaining Early Awareness for Undergraduate Programs (GEAR UP) incentive program has been in place since the late 1990s nationally. This grant, which covers a time span of six years and offers up to eighteen million dollars in federal funds, is designed to increase college readiness and decrease dropout rate among high school students. This study examines the effectiveness of this grant in southern Mississippi for the graduating class of 2014. Utilizing both quantitative and qualitative methods to determine the effectiveness of this grant, this study draws some conclusions and recommendations for this incentive program.