Digital Commons Network^™

Multimaterial Fibers In Photonics And Nanotechnology, Guangming Tao

Electronic Theses and Dissertations

Recent progress in combing multiple materials with distinct optical, electronic, and thermomechanical properties monolithically in a kilometer-long fiber drawn from a preform offers unique multifunctionality at a low cost. A wide range of unique in-fiber devices have been developed in fiber form-factor using this strategy. Here, I summary my recent results in this nascent field of 'multimaterial fibers'. I will focus on my achievements in producing robust infrared optical fibers and in appropriating optical fiber production technology for applications in nanofabrication. The development of optical components suitable for the infrared (IR) is crucial for applications in this spectral range to …

Laser Filamentation - Beyond Self-Focusing And Plasma Defocusing, Khan Lim

Electronic Theses and Dissertations

Laser filamentation is a highly complex and dynamic nonlinear process that is sensitive to many physical parameters. The basic properties that define a filament consist of (i) a narrow, high intensity core that persists for distances much greater than the Rayleigh distance, (ii) a low density plasma channel existing within the filament core, and (iii) a supercontinuum generated over the course of filamentation. However, there remain many questions pertaining to how these basic properties are affected by changes in the conditions in which the filaments are formed; that is the premise of the work presented in this dissertation. To examine …

Structural And Functional Studies Of Glycine Riboswitches And Development Of Fab Chaperone Assisted Rna Crystallography, Eileen Sherman

Electronic Theses and Dissertations

The glycine riboswitch is a structured RNA found upstream of genes in mRNA transcripts in many bacteria, functioning as a biofeedback gene regulator. Upon binding glycine, a complete RNA transcript including gene sequences is transcribed, effectively turning on gene expression. In an effort to understand the intricacies of its functioning, many mutants of the riboswitch were made and characterized during Ph. D. work, resulting in discovery of a P0 duplex/kink-turn motif involving a few nucleotides upstream of the established glycine riboswitch sequence which changed its ligand binding characteristics (Chapter 1). Previously, the two aptamers of the riboswitch were thought to …

Is There A Distinction Between A Priori And A Posteriori, Hiu Man Chan

Lingnan Theses

This thesis studies whether there is a tenable distinction between a priori justification and a posteriori justification.

My research considers three possible conceptions of a priori: (1) Justification Independent of Experience, (2) Mere Meaning Based Justification and (3) Justification by Rational Insight, and examines whether they can provide a sound and significant distinction between a priori and a posteriori.

This thesis contains five chapters. Chapter 1 introduces the background knowledge of the a priori/a posteriori distinction. Chapter 2 analyzes the traditional conception of a priori, i.e. justification independent of experience, and considers whether the distinction based on it is tenable. …

Ar Physics: Transforming Physics Diagrammatic Representations On Paper Into Interactive Simulations., Yao Zhou

Electronic Theses and Dissertations

A problem representation is a cognitive structure created by the solver in correspondence to the problem. Sketching representative diagrams in the domain of physics encourages a problem solving strategy that starts from 'envisionment' by which one internally simulates the physical events and predicts outcomes. Research studies also show that sketching representative diagrams improves learner's performance in solving physics problems. The pedagogic benefits of sketching representations on paper make this traditional learning strategy remain pivotal and worthwhile to be preserved and integrated into the current digital learning landscape. In this paper, I describe AR Physics, an Augmented Reality based application that …

An Examination Of Job Analysis: Developing Interdisciplinary Strategies In Human Resource Management Facilitative Of Mitigating Propensities Of Teacher Attrition, Julio Devere

Electronic Theses and Dissertations

Despite repeated attempts by school administrators, policymakers and researchers to diagnose and correct rising occurrences of teacher turnover, there has been little change in the actual efforts to retain teachers in academy organizations. In response, this study was conducted to describe process constraints within the academy organization that are responsible for managing teacher turnover. To provide a description of current teacher retention efforts by school administrators, a survey instrument was administered to school teachers in the State of Florida. The population sample was dispersed throughout the entire state and closely reflected the demographics of Florida school teachers. The survey addressed …

How Many Are Out There? A Novel Approach For Open And Closed Systems, Zia Rehman

Electronic Theses and Dissertations

We propose a ratio estimator to determine population estimates using capture-recapture sampling. It's different than traditional approaches in the following ways: (1) Ordering of recaptures: Currently data sets do not take into account the "ordering" of the recaptures, although this crucial information is available to them at no cost. (2) Dependence of trials and cluster sampling: Our model explicitly considers trials to be dependent and improves existing literature which assumes independence. (3) Rate of convergence: The percentage sampled has an inverse relationship with population size, for a chosen degree of accuracy. (4) Asymptotic Attainment of Minimum Variance (Open Systems: (=population …

Electric Power Resource "Shuffling" And Subnational Carbon Regulation: Looking Upstream For A Solution, Jim Rossi, Andrew J.D. Smith

Vanderbilt Law School Faculty Publications

"Resource shuffling" occurs when different subnational approaches to carbon regulation create variations in the costs of production across jurisdictions. California is the most aggressive jurisdiction in the United States to address climate change and has adopted a cap & trade program for its greenhouse gas (GHG) emissions. This Article addresses the resource shuffling issue presented by California's cap-and-trade program and evaluates the merits of various legal and regulatory solutions to the problem.

Deadly Premonition: Does Terrorist-Leader Psychology Influence Violence Lethality?, Clayton Besaw

Electronic Theses and Dissertations

This thesis seeks to address a theoretical and empirical gap within terrorism studies, and more specially the study of terrorist-group lethality. This research updates a model of terrorist-group lethality by including terrorist-leader psychology as an individual-level variable in predicting terrorist-group lethality. Terrorist-leader statements were analyzed by using two novel coding schemes called Operational Code and Leadership Trait Analysis to create quantified measurements of leader cognitive beliefs and personality traits. The empirical portion of this study utilizes pooled cross-sectional time-series data within the framework of fixed effects and multi-level estimation models. The results find that terrorist-leader psychology, and more specifically Instrumental …

Economic Inequality And Democratic Representative Institutions Across Western Industrialized Democracies, Donald Plungis

Electronic Theses and Dissertations

This study examines the effects of political representation on economic inequality across western industrialized democracies. I explore an explanation of increases in economic inequality as a consequence of less representative democratic institutions. Explaining economic inequality in this manner is a shift from to the Transatlantic Consensus that attributes increased economic inequality to globalization. I expect to find that more representative electoral and governments institutions will be associated with lower levels of economic inequality. The analysis takes place across twenty-three countries of the Organization for Economic Co-operation and Development (OECD) over the past forty years using a cross-sectional longitudinal model. Variables …

Effect Of Acute L-Alanyl-L-Glutamine (Sustamine) And Electrolyte Ingestion On Cognitive Function, Multiple Object Tracking And Reaction Time Following Prolonged Exercise, Gabriel Pruna

Electronic Theses and Dissertations

Changes in physiological function occurring during a body water deficit may result in significant decrements in performance, cognitive function and fine motor control during exercise. This may be due to the magnitude of the body water deficit. Rehydration strategies are important to prevent these deleterious effects in performance. The purpose of this study was to examine the changes before and after prolonged exercise of an alanine-glutamine dipeptide (AG) on cognitive function and reaction time. Twelve male endurance-trained runners (age: 23.5 [plus or minus] 3.7 y; height: 175.5 [plus or minus] 5.4 cm; weight: 70.7 [plus or minus] 7.6 kg) participated …

Distribution Of Laser Induced Heating In Multi-Component Chalcogenide Glass And Its Associated Effects, Laura Sisken

Electronic Theses and Dissertations

Chalcogenide glasses are well known to have good transparency into the infrared spectrum. These glasses though tend to have low thresholds as compared to oxide glasses for photo-induced changes and thermally-induced changes. Material modification such as photo-induced darkening, bleaching, refractive index change, densification or expansion, ablation of crystallization have been demonstrated, and are typically induced by a thermal furnace-based heat treatment, an optical source such as a laser, or a combination of photo-thermal interactions. Solely employing laser-based heating has an advantage over a furnace, since one has the potential to be able to spatially modify the materials properties with much …

Highly-Sensitive Stoichiometric Analysis Of Yag Ceramics Using Laser-Induced Breakdown Spectroscopy (Libs), Jahromi, Ali Kazemi

Electronic Theses and Dissertations

Transparent ceramics are an important class of optical materials with applications in high-strength windows, radiation detectors and high-power lasers. Despite the many successful developments of the past decades, their challenging fabrication still needs to be perfected to achieve a better consistency in optical quality. In particular, ternary phase materials such as Yttrium Aluminum Garnet (YAG, Y3Al5O12), a long standing high-power laser host, require a precise control of stoichiometry, often beyond the precision of current analytical techniques, in order to reduce scattering losses and the presence of deleterious point defects. This work explores the potential of Laser-Induced Breakdown Spectroscopy (LIBS) for …

A Comparative Study Of The Effect Of Block Scheduling And Traditional Scheduling On Student Achievement For The Florida Algebra 1 End-Of-Course Examination, Arthur Underwood

Electronic Theses and Dissertations

The focus of this research was on the effect of school schedules on student achievement for ninth-grade students in a Florida school district. Data were collected from two central Florida high schools from the 2011-2012 and 2012-2013 school years. Five one-way analyses of covariance (ANCOVA) were performed to ascertain if there was any interaction between school schedules and student achievement. Examined were the interactions (a) between schedule and schools, (b) schedule and male students, (c) schedule and female students, (d) schedule and Black students, and (e) schedule and Hispanic students. The independent variable, school schedule, consisted of two levels: traditional …

A Professional Learning Community Design: Using Close Reading Techniques To Improve The U.S. History Comprehension, Maureen Tinsley

Electronic Theses and Dissertations

This dissertation in practice presents a research-based model for staff development utilizing the elements of a professional learning community. The focus of this problem of practice was determined through an analysis of one high school's reading data indicating that 36% of the student body was reading below grade level according to the state assessment test for reading. Researchers have noted that reading demands for college and careers have increased (Alliance for Excellent Education, 2011; Barton, 2000; Common Core State Standards, 2014). If students do not develop reading proficiency to graduate with a high school diploma, they are at risk of …

A Single Case Analysis Of The Impact Of Caregiver-Student Collaborative Learning On An Urban Community, Heather Edmundson

Electronic Theses and Dissertations

The purpose of this study was to measure the impact of caregiver-student collaborative learning classes on an urban community. The study examined whether the self-efficacy of the caregivers increased with helping their children with school work due to the caregiver-student classes. The study also examined whether providing access to a resource not normally provided within this particular community led to increased self-efficacy within caregivers. The research questions that guided the study were as follows: How do collaborative caregiver-student classes that focus on collaborative strategies impact the self-efficacy of the caregivers in helping their children with school work? How does increasing …

A Systematic Review Of Research On Successful African American Students In Mathematics: Implications For Seminole High School, Trung Vong

Electronic Theses and Dissertations

The purpose of this study was to synthesize the counter-narratives of mathematically successful African American students. The gap in educational achievement between African American and White students is well documented in the United States, especially in mathematics education. Although Florida Comprehensive Assessment Test scores have increased for both groups at Seminole High School, the gap has remained over 30% for nearly a decade. Most research on this topic has focused on the reasons why African American students fail to achieve. Various individual, social, and organizational factors have been suggested. However, a growing body of research has highlighted the stories of …

Electronic Transport And Correlations In Single Magnetic Molecule Devices, Javier Romero

Electronic Theses and Dissertations

In this dissertation, we study the most important microscopic aspects that grant molecules such as Single Molecule Magnets (SMMs) their preferential spin direction. We do so by proposing and solving a model that includes correlations between electrons occupying atomic orbitals. In addition, we study the relation between the non-equilibrium electronic transport signatures in a SMM model weakly coupled to a three-terminal single electron transistor device, and the interference features of the SMM model in the presence of a magnetic field. Finally, we investigate the equilibrium transport features in a giant-spin model of a SMM in the Kondo regime. We study …

Degradation Of Hydrazine And Monomethylhydrazine For Fuel Waste Streams Using Alpha-Ketoglutaric Acid, Carolina Franco

Electronic Theses and Dissertations

Alpha-ketoglutaric acid (AKGA) is an organic acid important for the metabolism of essential amino acids as well as for the transfer of cellular energy. It is a precursor of glutamic acid which is produced by the human body during the Krebs Cycle. AKGA has a specific industrial interest as it can be taken as a dietary supplement and is also widely used as a building block in chemical synthesis. Collectively termed as hydrazine (HZs), hydrazine (HZ) and monomethylhydrazine (MMH) are hypergolic fuels that do not need an ignition source to burn. Because of the particular HZs' characteristics the National Aeronautics …

Admission Criteria For Schools Of Business: Common Prerequisites And Academic Performance In Upper-Level Business Coursework, Helen Becker

Electronic Theses and Dissertations

Schools of business within the Florida State University system have state-mandated common prerequisites that students are required to complete prior to formal admission into baccalaureate business programs. As such, the common prerequisites serve as minimum admission requirements for schools of business in the state of Florida. This study sought to determine the ability of these discipline specific admission criteria to predict academic performance in upper-level business coursework. This study looked at existing data for 860 students in the College of Business Administration at the University of Central Florida. Findings of the study demonstrate that there is a positive and moderate …

Application Of Two-Photon Absorbing Fluorene-Containing Compounds In Bioimaging And Photodyanimc Therapy, Xiling Yue

Electronic Theses and Dissertations

Two-photon absorbing (2PA) materials has been widely studied for their highly localized excitation and nonlinear excitation efficiency. Application of 2PA materials includes fluorescence imaging, microfabrication, 3D data storage, photodynamic therapy, etc. Many materials have good 2PA photophysical properties, among which, the fluorenyl structure and its derivatives have attracted attention with their high 2PA cross-section and high fluorescence quantum yield. Herein, several compounds with 2PA properties are discussed. All of these compounds contain one or two fluorenyl core units as part of the conjugated system. The aim of this dissertation is to discuss the application of these compounds according to their …

An Analysis Of The Difference Between Assessed Instructional Practices, Value-Added Measures, And Learning Gains Of Secondary Reading Teachers, Ronald Fritz

Electronic Theses and Dissertations

The purpose of this study was to analyze the relationship that exists among instructional practice scores, value-added measures, and learning gains for the Large Urban School District (LUSD) among reading teachers in Grades 6-12 for the 2012-2013 school year. In addition, this study was also conducted to address the perceptions of secondary school principals and assistant principals regarding the relationship of the three variables and their relevance in making personnel decisions. Quantitative data were obtained from school district databases for observation scores, value-added measures, and standardized assessment achievement data to determine the relationship among the variables. In addition, a perception …

A Comparison Of Eighth-Grade Mathematics Scores By State And By The Four Census-Defined Regions Of National Assessment Of Educational Progress (Naep), Laurel Robinson

Electronic Theses and Dissertations

The purpose of this study was to investigate the information regarding the comparative relationship between the proficient mathematics scores of eighth-grade students on the 2009 state mathematics assessments and the 2009 National Assessment of Educational Progress (NAEP) mathematics assessment by state, census-defined regions and AYP subgroups. Analysis was completed and six research questions were used to guide the study. A multiple regression was used to assess the relationship between the percentage of eighth-grade students who were proficient in mathematics as assessed by the 2009 NAEP and those who were proficient in mathematics as assessed by their 2009 state assessment. A …

Creation And Application Of Routines For Determining Physical Properties Of Asteroids And Exoplanets From Low Signal-To-Noise Data Sets, Nathaniel Lust

Electronic Theses and Dissertations

Astronomy is a data heavy field driven by observations of remote sources reflecting or emitting light. These signals are transient in nature, which makes it very important to fully utilize every observation. This however is often difficult due to the faintness of these observations, often are only slightly above the level of observational noise. We present new or adapted methodologies for dealing with these low signal-to-noise scenarios, along with practical examples including determining exoplanet physical properties, periodicities in asteroids, and the rotational and orbital properties of the multiple asteroid system 2577 Litva.

Broad Bandwidth, All-Fiber, Thulium-Doped Photonic Crystal Fiber Amplifier For Potential Use In Scaling Ultrashort Pulse Peak Powers, Alex Sincore

Electronic Theses and Dissertations

Fiber based ultrashort pulse laser sources are desirable for many applications; however generating high peak powers in fiber lasers is primarily limited by the onset of nonlinear effects such as self-phase modulation, stimulated Raman scattering, and self-focusing. Increasing the fiber core diameter mitigates the onset of these nonlinear effects, but also allows unwanted higher-order transverse spatial modes to propagate. Both large core diameters and single-mode propagation can be simultaneously attained using photonic crystal fibers. Thulium-doped fiber lasers are attractive for high peak power ultrashort pulse systems. They offer a broad gain bandwidth, capable of amplifying sub-100 femtosecond pulses. The longer …

Alpine And Other Abandoned Towns Along The Great Northern Railroad Near Stevens Pass, Washington, 1890-1930, Stacy Marie Stanley

All Master's Theses

Despite the wealth of research on the early transcontinental railroads of the West, including certain areas in Washington State, there is little known about the railroad towns, camps and logging communities that arose due to the construction of the Great Northern Railroad in the Stevens Pass area. This thesis summarizes some of the information on the history of the study area, as well as results of a field investigation of archaeological remnants of one railroad town, the town of Alpine. Alpine was a short-lived town established during construction of the railroad ca. 1892 or a little later in 1910, and …

Unintended Outcomes Of Farmers' Adaptation To Climate Variability: Deforestation And Conservation In Calakmul And Maya Biosphere Reserves, Claudia Rodriguez-Solorzano

Dartmouth Scholarship

Minimizing the impact of climate change on farmer livelihoods is crucial, but adaptation efforts may have unintended consequences for ecosystems, with potential impacts on farmers’ welfare. Unintended outcomes of climate adaptation strategies have been widely discussed, however, empirical exploration has been neglected. Grounded in scholarship on climate adaptation, environmental governance, social–ecological systems, and land-use change, this paper studies whether farmers’ climate adaptation contributes to deforestation or forest conservation. The paper draws on interviews with 353 farmers from 46 communities in Calakmul Biosphere Reserve in Mexico and Maya Biosphere Reserve in Guatemala. Farmers in the area of study have implemented adaptation …

Novice Science Teachers' Thinking About The Purpose Of Teachers' Questions, Gwyndolyn Crittenden

Electronic Theses and Dissertations

Effective teacher questioning during whole group instruction remains an important pedagogy in science education, especially the importance of helping novice teachers to guide student thinking using effective questions. This study examined how novice secondary science teachers’ understand the relationship between student thinking and teacher questioning. The sample was seven novice secondary science teachers’ enrolled in the University of Central Florida’s job embedded Resident Teacher Professional Preparation Program (RTP3 ). All participants received instruction and guided practice with the use of questions to elicit, probe, and challenge student ideas in the secondary science pedagogy class. Participants completed a questionnaire describing their …

Techniques For Characterization Of Third Order Optical Nonlinearities, Manuel Ferdinandus

Electronic Theses and Dissertations

This dissertation describes the development of novel techniques for characterization of nonlinear properties of materials. The dissertation is divided into two parts, a background and theory section and a technique development section. In the background and theory section we explain the origins of the nonlinear optical response of materials across many different spatial and temporal scales. The mechanisms that we are most interested in are the electronic nuclear and reorientational responses, which occur on the range of sub-femtosecond to several picoseconds. The electronic mechanism is due to the electrons of a material experiencing a non-parabolic potential well due a strong …

Driving Performance Adaptation Through Practice With And Without Distracters In A Simulated Environment, Marc Gentzler

Electronic Theses and Dissertations

A preponderance of research points to the detrimental effects of distraction on driving performance. An interesting question is whether practice can improve distracted driving. The results from the few longitudinal simulator-based research studies conducted on driving distraction have been inconclusive. This may be because practice effects could be confounded with participants adapting to driving in the simulator. Therefore, participants in the current studies were trained until performance reached a steady state prior to introducing the distracters. In this dissertation, two single-subject design studies were used to investigate the effects of training on distracted driving. The first study included two participants …