Digital Commons Network^™

The Effects Of Phosphatidylserine On Reaction Time And Cognitive Function Following An Exercise Stress, Adam John Wells

Electronic Theses and Dissertations

Phosphatidylserine (PS) is an endogenously occurring phospholipid that has been shown to have cognition and mood enhancing properties in humans, possibly through its role as an enzyme co-factor in cellular signal transduction. Specifically, PS has been identified as activator of classical isoforms of protein kinase C, an enzyme known to be involved in the growth and differentiation of neural cells, and is therefore thought to play a role in the protection of neurons. The purpose of this study was to examine the effects of supplementation with PS and caffeine on measures of cognition, reaction time and mood prior to and …

Levels Of Engagement Among Male, College Basketball Players, Mary Botts

Electronic Theses and Dissertations

This study examined the engagement of male, college basketball players within the National Collegiate Athletic Association (NCAA). The literature review shows a connection between engaging in educationally purposeful activities and student retention. Because some student athletes, male collegiate basketball players in particular, struggle to graduate at the same rate as their fellow student athletes, student engagement offers one lens to examine the educational experiences of basketball players. The National Survey of Student Engagement (NSSE) was used to collect levels of engagement along four identified variables. These four variables, part of Chickering and Gamson’s Seven Principles for Good Undergraduate Education, were …

Detecting And Characterizing Exoplanets: The Gj 436 And Hd 149026 Systems, Kevin Stevenson

Electronic Theses and Dissertations

This dissertation investigates two stellar systems known to contain extrasolar planets. It is comprised of five chapters that are readily divided into three independent but related analyses. Chapter 1 reports on the analysis of low signal-to-noise secondary-eclipse observations of the Neptune-sized exoplanet GJ 436b using the Spitzer Space Telescope in multiple infrared channels. The measured wavelength-dependent eclipse depths provide constraints on the planet’s dayside atmospheric composition and thermal profile. The analysis indicates that GJ 436b’s atmosphere is abundant in carbon monoxide and deficient in methane relative to thermochemical equilibrium models for the predicted hydrogen-dominated atmosphere. Chapter 2 discusses the techniques …

Selective Multivariate Applications In Forensic Science, Caitlin Rinke

Electronic Theses and Dissertations

A 2009 report published by the National Research Council addressed the need for improvements in the field of forensic science. In the report emphasis was placed on the need for more rigorous scientific analysis within many forensic science disciplines and for established limitations and determination of error rates from statistical analysis. This research focused on multivariate statistical techniques for the analysis of spectral data obtained for multiple forensic applications which include samples from: automobile float glasses and paints, bones, metal transfers, ignitable liquids and fire debris, and organic compounds including explosives. The statistical techniques were used for two types of …

Structure, Stability, Vibrational, Thermodynamic, And Catalytic Properties Of Metal Nanostructures: Size, Shape, Support, And Adsorbate Effects, Farzad Behafarid

Electronic Theses and Dissertations

Recent advances in nanoscience and technology have provided the scientific community with new exciting opportunities to rationally design and fabricate materials at the nanometer scale with drastically different properties as compared to their bulk counterparts. A variety of challenges related to nanoparticle (NP) synthesis and materials characterization have been tackled , allowing us to make more homogenous, well defined, size- and shape-selected NPs, and to probe deeper and more comprehensively into their distinct properties. In this dissertation, a variety of phenomena relevant to nanosized materials are investigated, including the thermal stability of NPs and coarsening phenomena in different environments, the …

A Study Of The Degradative Capabilities Of The Bimetallic System: Mg(Pd/C) As Applied In The Destruction Of Decafluoropentane, An Environmental Contaminant, Douglas Tomlin

Electronic Theses and Dissertations

Pollution from hydrofluorocarbons (HFC) poses a serious challenge to the environmental community. Released from industrial operations, they have contaminated both the atmosphere and groundwater and are considered persistent in both media.1 For over the past 20 years, the practice of synthesizing hydrofluorocarbons as alternatives to chlorofluorocarbons (CFC) has been conducted in an effort to reverse the effects of stratospheric ozone layer depletion. 2,3 However, in doing so these new fluorinated compounds exhibited an unexpected property as a potent global warming greenhouse gas (GHG) with radiative forcing potentials in the range of 100 to 10,000 equivalents greater than carbon dioxide.4 Conversely, …

Probing Space: Formative Assessment In A Middle School Inquiry-Based Science Classroom, Clinton W. Anderson

Electronic Theses and Dissertations

This action research thesis was performed to explore the research questions: How did the use of formative assessment affect student performance data in understanding the concepts of the Sun-Earth-Moon system?, How did the use of learning scales as formative techniques impact student self-assessment of their knowledge of the Sun-Earth-Moon system?, How did the implementation of formative assessment techniques affect student discourse on the topic of the Sun-Earth-Moon system? Formative assessment techniques including "talk-friendly" probes, sticky bars, and agree-disagree statements were used in the classroom to expose gaps in knowledge, to facilitate discourse, and promote self-assessment. A triangulation of data included …

The Influence Of Components Of Positive Psychology On Student Development, Yo Sang Ha

Electronic Theses and Dissertations

Considering a wide range of student's delinquencies and problems, preventive intervention in school is strongly required for healthy student development. American School counselor Association (ASCA) has focused on three areas, academic development, career development, and personal/social development to provide various skills and learning opportunities for the successful life of students. During the past 50 years, psychologists have concentrated on the disease treatment model. However, unlike this psychological trend, positive psychology has paid attention to prevent school violence and delinquency. Further, Positive psychologists have discovered not only to prevent problems but also to facilitate human strengths and virtues to live successful …

High-Efficiency Blue Phase Liquid Crystal Displays, Yan Li

Electronic Theses and Dissertations

Blue phase liquid crystals (BPLCs) have a delicate lattice structure existing between chiral nematic and isotropic phases, with a stable temperature range of about 2 K. But due to short coherent length, these self-assembled nano-structured BPLCs have a fast response time. In the past three decades, the application of BPLC has been rather limited because of its narrow temperature range. In 2002, Kikuchi et al. developed a polymer stabilization method to extend the blue-phase temperature range to more than 60 K. This opens a new gateway for display and photonic applications. In this dissertation, I investigate the material properties of …

Assessment Of Molecular Interactions Via Magnetic Relaxation: A Quest For Inhibitors Of The Anthrax Toxin, Oscar Santiesteban

Electronic Theses and Dissertations

Anthrax is severe disease caused by the gram-positive Bacillus anthracis that can affect humans with deadly consequences. The disease propagates via the release of bacterial spores that can be naturally found in animals or can be weaponized and intentionally released into the atmosphere in a terrorist attack. Once inhaled, the spores become activated and the anthrax bacterium starts to reproduce and damage healthy macrophages by the release of the anthrax toxin. The anthrax toxin is composed of three virulent factors: (i) anthrax protective antigen (APA), (ii) anthrax lethal factor (ALF), and (iii) anthrax edema factor (AEF) that work in harmony …

The Antecedents And Consequences Of Teacher Professional Discretion Over Curriculum And Instruction: A Grounded Theory Inquiry, Marc Spittler

Electronic Theses and Dissertations

With the ever-changing requirements of a secondary level of education and the application of standardized testing criteria to determine proficiency in mastery of the subject matter, the attempt to create a standard and acceptable curriculum for all school sites has left the control of the schools. Now classrooms are scrambling for focus, guidance and support with curriculum development and implementation. Over the last three decades, there have been numerous research studies that have examined the place of the classroom teacher in the process of creating curriculum for their classroom with mixed results. The efforts to reform secondary education, from the …

Laser Filamentation Interaction With Materials For Spectroscopic Applications, Matthew Weidman

Electronic Theses and Dissertations

Laser filamentation is a non-diffracting propagation regime consisting of an intense core that is surrounded by an energy reservoir. For laser ablation based spectroscopy techniques such as Laser Induced Breakdown Spectroscopy (LIBS), laser filamentation enables the remote delivery of high power density laser radiation at long distances. This work shows a quasiconstant filament-induced mass ablation along a 35 m propagation distance. The mass ablated is sufficient for the application of laser filamentation as a sampling tool for plasma based spectroscopy techniques. Within the scope of this study, single-shot ablation was compared with multi-shot ablation. The dependence of ablated mass on …

Somatechnologies Of Body Size Modification: Posthuman Embodiment And Discourses Of Health, Meghan Griffin

Electronic Theses and Dissertations

This project focuses on persistent gaps in philosophies of the body: the enduring mindbody divide in accounts of phenomenology, the unfulfilled promises of representing and inhabiting the body in online and virtual spaces, and the difference between health as quantified in medical discourse versus health as lived experience. These tensions are brought to light through the electronic food journal genre where the difficulty in capturing pre-noetic, outsideconsciousness aspects of experience and embodied health are thrown into relief against circulating cultural discourses surrounding health, body size, self-surveillance, and self-care. The electronic food journal genre serves as a space for users to …

The Community College Baccalaureate And Adult Students: A Qualitative Analysis, Angela Kersenbrock

Electronic Theses and Dissertations

The focus of this qualitative research was to investigate the motivations, experiences, and constructs of non-traditional adult students who elected to enroll in community college baccalaureate programs. The participants in this investigation were a homogeneous sample of adult students who had priorities other than school, such as employment and families. The research questions which guided the study sought to explore the narratives adult students shared of their reasons for choosing to enroll in a community college baccalaureate degree program, how they described meaning to having access to these new degrees, and what impact the community college baccalaureate had on the …

Medical School Prerequisite Courses Completed At Two-Year Colleges By Medical School Matriculants: An Analysis At The University Of Central Florida, Erin Myszkowski

Electronic Theses and Dissertations

Many medical school admissions personnel and pre-health advisors advise premedical students not to take the medical school prerequisite courses at two-year colleges because they believe the courses are less academically rigorous than the same courses at four-year institutions (Losada, 2009; Marie, 2009; Thurlow, 2008, 2009a, 2009b). According to this belief, premedical students who complete the medical school prerequisite courses at a two-year college could be at a disadvantage in regard to medical school admission compared to those students who complete the medical school prerequisite courses at a four-year institution. In an effort to analyze these perceptions, this study examined factors …

Enriching Students With Developmental Delays In An Early Childhood Classroom Using Ipads With Mathematics Applications, Selma Powell

Electronic Theses and Dissertations

Laws and legislation related to early childhood and special education have shaped the field and impacted the need for early intervention services, but the outcomes of those services both academically and socially at the forefront. Children with developmental delays today are eligible for school services beginning at birth across the country, the new challenging is determining the impact of services on the social and academic outcomes. Many children with developmental delays are served in inclusive early intervention classrooms. A need for developmentally appropriate quality mathematics instruction exists to prepare students to meet the demands of a global economy; students must …

Integrated Assessment Of Anthropogenic, Climate, And Policy Induced Changes Of Phosphorus Export In The United States Laurentian Great Lakes Watersheds, Meredith Ballard Labeau

Dissertations, Master's Theses and Master's Reports - Open

Anthropogenic activities have increased phosphorus (P) loading in tributaries to the Laurentian Great Lakes resulting in eutrophication in small bays to most notably, Lake Erie. Changes to surface water quality from P loading have resulted in billions of dollars in damage and threaten the health of the world’s largest freshwater resource. To understand the factors affecting P delivery with projected increasing urban lands and biofuels expansion, two spatially explicit models were coupled. The coupled models predict that the majority of the basin will experience a significant increase in urban area P sources while the agriculture intensity and forest sources of …

Biophysics, Environmental Stochasticity, And The Evolution Of Thermal Safety Margins In Intertidal Limpets, W. Wesley Dowd, M. W. Denny

Biology Faculty Works

As the air temperature of the Earth rises, ecological relationships within a community might shift, in part due to differences in the thermal physiology of species. Prediction of these shifts – an urgent task for ecologists – will be complicated if thermal tolerance itself can rapidly evolve. Here, we employ a mechanistic approach to predict the potential for rapid evolution of thermal tolerance in the intertidal limpet Lottia gigantea. Using biophysical principles to predict body temperature as a function of the state of the environment, and an environmental bootstrap procedure to predict how the environment fluctuates through time, we create …

Performance Evaluation And Characterization Of Symmetric Capacitors With Carbon Black, And Asymmetric Capacitors Using A Carbon Foam Supported Nickel Electrode, Jinjin Wang

Dissertations, Master's Theses and Master's Reports - Open

This thesis evaluates a novel asymmetric capacitor incorporating a carbon foam supported nickel hydroxide positive electrode and a carbon black negative electrode. A series of symmetric capacitors were prepared to characterize the carbon black (CB) negative electrode. The influence of the binder, PTFE, content on the cell properties was evaluated. X-ray diffraction characterization of the nickel electrode during cycling is also presented.

The 3 wt% and 5 wt% PTFE/CB symmetric cells were examined using cyclic voltammetry (CV) and constant current charge/discharge measurements. As compared with symmetric cells containing more PTFE, the 3 wt% cell has the highest average specific capacitance, …

Online Distribution Management Framework By Incorporating Wind Generation, Bhairavi Pandya

Dissertations, Master's Theses and Master's Reports - Open

In distribution system operations, dispatchers at control center closely monitor system operating limits to ensure system reliability and adequacy. This reliability is partly due to the provision of remote controllable tie and sectionalizing switches. While the stochastic nature of wind generation can impact the level of wind energy penetration in the network, an estimate of the output from wind on hourly basis can be extremely useful. Under any operating conditions, the switching actions require human intervention and can be an extremely stressful task. Currently, handling a set of switching combinations with the uncertainty of distributed wind generation as part of …

Calibration Of The Hawc Gamma-Ray Observatory, Nathan C. Kelley-Hoskins

Dissertations, Master's Theses and Master's Reports - Open

The High-Altitude Water Cherenkov (HAWC) Experiment is a gamma-ray observatory that utilizes water silos as Cherenkov detectors to measure the electromagnetic air showers created by gamma rays. The experiment consists of an array of closely packed water Cherenkov detectors (WCDs), each with four photomultiplier tubes (PMTs). The direction of the gamma ray will be reconstructed using the times when the electromagnetic shower front triggers PMTs in each WCD. To achieve an angular resolution as low as 0.1 degrees, a laser calibration system will be used to measure relative PMT response times. The system will direct 300ps laser pulses into two …

Charge And Spin Transport In Nanoscale Junction From First Principles, Subhasish Mandal

Dissertations, Master's Theses and Master's Reports - Open

Recently nanoscale junctions consisting of 0-D nanostructures (single molecule) or 1-D nanostructures (semiconducting nanowire) sandwiched between two metal electrodes are successfully fabricated and characterized. What lacks in the recent developments is the understanding of the mechanism behind the observed phenomena at the level of atoms and electrons. For example, the origin of observed switching effect in a semiconducting nanowire due to the influence of an external gate bias is not yet understood at the electronic structure level. On the same context, different experimental groups have reported different signs in tunneling magneto-resistance for the same organic spin valve structure, which has …

Berry-Esseen Bounds For Nonlinear Statistics, And Asymptotic Relative Efficiency Between Correlation Statistics, Raymond E. Molzon

Dissertations, Master's Theses and Master's Reports - Open

Four papers, written in collaboration with the author’s graduate school advisor, are presented. In the first paper, uniform and non-uniform Berry-Esseen (BE) bounds on the convergence to normality of a general class of nonlinear statistics are provided; novel applications to specific statistics, including the non-central Student’s, Pearson’s, and the non-central Hotelling’s, are also stated. In the second paper, a BE bound on the rate of convergence of the F-statistic used in testing hypotheses from a general linear model is given. The third paper considers the asymptotic relative efficiency (ARE) between the Pearson, Spearman, and Kendall …

Perceptions Of Water Conditions And Management In The Sonora River Basin, Sonora, Mexico, Ellen Brenna

Dissertations, Master's Theses and Master's Reports - Open

The effects of climate change are expected to be very severe in arid regions. The Sonora River Basin, in the northwestern state of Sonora, Mexico, is likely to be severely affected. Some of the anticipated effects include precipitation variability, intense storm events, higher overall temperatures, and less available water. In addition, population in Sonora, specifically the capital city of Hermosillo, is increasing at a 1.5% rate and current populations are near 700,000. With the reduction in water availability and an increase in population, Sonora, Mexico is expected to experience severe water resource issues in the near future.

In anticipation of …

Geophysical And Geological Analysis Of The Collingwood Member Of The Trenton Formation, Ryan M. Banas

Dissertations, Master's Theses and Master's Reports - Open

The Collingwood Member is a mid to late Ordovician self-sourced reservoir deposited across the northern Michigan Basin and parts of Ontario, Canada. Although it had been previously studied in Canada, there has been relatively little data available from the Michigan subsurface. Recent commercial interest in the Collingwood has resulted in the drilling and production of several wells in the state of Michigan.

An analysis of core samples, measured laboratory data, and petrophysical logs has yielded both a quantitative and qualitative understanding of the formation in the Michigan Basin. The Collingwood is a low permeability and low porosity carbonate package that …

Comparing Satellite And Ground-Based Observations Of Paroxysmal Degassing Events At Etna Volcano, Italy, Céline L. Mandon

Dissertations, Master's Theses and Master's Reports - Open

Mount Etna, Italy, is one of the most active volcanoes in the world, and is also regarded as one of the strongest volcanic sources of sulfur dioxide (SO₂) emissions to the atmosphere. Since October 2004, an automated ultraviolet (UV) spectrometer network (FLAME) has provided ground-based SO₂ measurements with high temporal resolution, providing an opportunity to validate satellite SO₂ measurements at Etna. The Ozone Monitoring Instrument (OMI) on the NASA Aura satellite, which makes global daily measurements of trace gases in the atmosphere, was used to compare SO₂ amount released by the volcano during paroxysmal lava-fountaining …

Slope Stability Analysis Of The Pacaya Volcano, Guatemala, Using Limit Equilibrium And Finite Element Method , Patrick. Manzoni

Dissertations, Master's Theses and Master's Reports - Open

The Pacaya volcanic complex is part of the Central American volcanic arc, which is associated with the subduction of the Cocos tectonic plate under the Caribbean plate. Located 30 km south of Guatemala City, Pacaya is situated on the southern rim of the Amatitlan Caldera. It is the largest post-caldera volcano, and has been one of Central America’s most active volcanoes over the last 500 years. Between 400 and 2000 years B.P, the Pacaya volcano had experienced a huge collapse, which resulted in the formation of horseshoe-shaped scarp that is still visible. In the recent years, several smaller collapses have …

Understanding "Just Enough" Computer Users: Motivation Style And Proficiency, Harriet Cook King

Dissertations, Master's Theses and Master's Reports - Open

Among daily computer users who are proficient, some are flexible at accomplishing unfamiliar tasks on their own and others have difficulty. Software designers and evaluators involved with Human Computer Interaction (HCI) should account for any group of proficient daily users that are shown to stumble over unfamiliar tasks. We define "Just Enough" (JE) users as proficient daily computer users with predominantly extrinsic motivation style who know just enough to get what they want or need from the computer. We hypothesize that JE users have difficulty with unfamiliar computer tasks and skill transfer, whereas intrinsically motivated daily users accomplish unfamiliar tasks …

Multimodal Performance And Reliability Analysis Of The Pierre Auger Observatory North Site, Maira Maskevics

Dissertations, Master's Theses and Master's Reports - Open

The Pierre Auger Cosmic Ray Observatory North site employs a large array of surface detector stations (tanks) to detect the secondary particle showers generated by ultra-high energy cosmic rays. Due to the rare nature of ultra-high energy cosmic rays, it is important to have a high reliability on tank communications, ensuring no valuable data is lost. The Auger North site employs a peer-to-peer paradigm, the Wireless Architecture for Hard Real-Time Embedded Networks (WAHREN), designed specifically for highly reliable message delivery over fixed networks, under hard real-time deadlines.

The WAHREN design included two retransmission protocols, Micro- and Macro- retransmission. To fully …

Geotechnical Data And Numerical Analysis Of Edifice Collapse And Related Hazards At Pacaya Volcano, Guatemala, Lauren N. Schaefer

Dissertations, Master's Theses and Master's Reports - Open

The continual eruptive activity, occurrence of an ancestral catastrophic collapse, and inherent geologic features of Pacaya volcano (Guatemala) demands an evaluation of potential collapse hazards. This thesis merges techniques in the field and laboratory for a better rock mass characterization of volcanic slopes and slope stability evaluation. New field geological, structural, rock mechanical and geotechnical data on Pacaya is reported and is integrated with laboratory tests to better define the physical-mechanical rock mass properties. Additionally, this data is used in numerical models for the quantitative evaluation of lateral instability of large sector collapses and shallow landslides. Regional tectonics and local …