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2013

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The Impact Of Growth Conditions On Cubic Znmgo Ultraviolet Sensors, Ryan Boutwell Jan 2013

The Impact Of Growth Conditions On Cubic Znmgo Ultraviolet Sensors, Ryan Boutwell

Electronic Theses and Dissertations

Cubic Zn1-xMgxO (c-Zn1-xMgxO) thin films have opened the deep ultraviolet (DUV) spectrum to exploration by oxide optoelectronic devices. These extraordinary films are readily wet-etch-able, have inversion symmetric lattices, and are made of common and safe constituents. They also host a number of new exciting experimental and theoretical challenges. Here, the relation between growth conditions of the c-Zn1-xMgxO film and performance of fabricated ultraviolet (UV) sensors is investigated. Plasma-Enhanced Molecular Beam Epitaxy was used to grow Zn1-xMgxO thin films and formation conditions were explored by varying the growth temperature, Mg source flux, oxygen flow rate, and radio-frequency (RF) power coupled into …

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Trace Contaminant Control: An In-Depth Study Of A Silica-Titania Composite For Photocatalytic Remediation Of Closed-Environment Habitat Air, Janelle Coutts Jan 2013

Trace Contaminant Control: An In-Depth Study Of A Silica-Titania Composite For Photocatalytic Remediation Of Closed-Environment Habitat Air, Janelle Coutts

Electronic Theses and Dissertations

This collection of studies focuses on a PCO system for the oxidation of a model compound, ethanol, using an adsorption-enhanced silica-Ti02 composite (STC) as the photocatalyst; studies are aimed at addressing the optimization of various parameters including light source, humidity, temperature, and possible poisoning events for use as part of a system for gaseous trace-contaminant control system in closed-environment habitats. The first goal focused on distinguishing the effect of photon flux (i.e., photons per unit time reaching a surface) from that ofphoton energy (i.e., wavelength) of a photon source on the PCO of ethanol. Experiments were conducted in a bench-scale …

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Development Of Laser Spectroscopy For Elemental And Molecular Analysis, Yuan Liu Jan 2013

Development Of Laser Spectroscopy For Elemental And Molecular Analysis, Yuan Liu

Electronic Theses and Dissertations

Laser-Induced Breakdown Spectroscopy (LIBS) and Raman spectroscopy are still growing analytical and sensing spectroscopic techniques. They significantly reduce the time and labor cost in analysis with simplified instrumentation, and lead to minimal or no sample damage. In this dissertation, fundamental studies to improve LIBS analytical performance were performed and its fusion with Raman into one single sensor was explored. On the fundamental side, Thomson scattering was reported for the first time to simultaneously measure the electron density and temperature of laser plasmas from a solid aluminum target at atmospheric pressure. Comparison between electron and excitation temperatures brought insights into the …

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Investigation Of A Novel Magnesium And Acidified Ethanol System For The Degradation Of Persistent Organic Pollutants, Phillip Maloney Jan 2013

Investigation Of A Novel Magnesium And Acidified Ethanol System For The Degradation Of Persistent Organic Pollutants, Phillip Maloney

Electronic Theses and Dissertations

For centuries chemists have sought to improve humankind’s quality of life and address many of society’s most pressing needs through the development of chemical processes and synthesis of new compounds, often with phenomenal results. Unfortunately, there also are many examples where these chemicals have had unintended, detrimental consequences that are not apparent until years or decades after their initial use. There are numerous halogenated molecules in this category that are globally dispersed, resistant to natural degradation processes, bioaccumulative, and toxic to living organisms. Chemicals such as these are classified as persistent organic pollutants (POPs), and due to their negative environmental …

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Spectrally Uniform Frames And Spectrally Optimal Dual Frames, Saliha Pehlivan Jan 2013

Spectrally Uniform Frames And Spectrally Optimal Dual Frames, Saliha Pehlivan

Electronic Theses and Dissertations

Frames have been useful in signal transmission due to the built in redundancy. In recent years, the erasure problem in data transmission has been the focus of considerable research in the case the error estimate is measured by operator (or matrix) norm. Sample results include the characterization of one-erasure optimal Parseval frames, the connection between two-erasure optimal Parseval frames and equiangular frames, and some characterization of optimal dual frames. If iterations are allowed in the reconstruction process of the signal vector, then spectral radius measurement for the error operators is more appropriate then the operator norm measurement. We obtain a …

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Prediction Of Optical Properties Of Pi-Conjugated Organic Materials For Technological Innovations, Iffat Nayyar Jan 2013

Prediction Of Optical Properties Of Pi-Conjugated Organic Materials For Technological Innovations, Iffat Nayyar

Electronic Theses and Dissertations

Organic π-conjugated solids are promising candidates for new optoelectronic materials. The large body of evidence points at their advantageous properties such as high charge-carrier mobility, large nonlinear polarizability, mechanical flexibility, simple and low cost fabrication and superior luminescence. They can be used as nonlinear optical (NLO) materials with large two-photon absorption (2PA) and as electronic components capable of generating nonlinear neutral (excitonic) and charged (polaronic) excitations. In this work, we investigate the appropriate theoretical methods used for the (a) prediction of 2PA properties for rational design of organic materials with improved NLO properties, and (b) understanding of the essential electronic …

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Stereotypes, Perceptions Of Similarity, And Cultural Identity: Factors That May Influence The Academic Achievement Of Immigrant Students., Tamara Fagan Jan 2013

Stereotypes, Perceptions Of Similarity, And Cultural Identity: Factors That May Influence The Academic Achievement Of Immigrant Students., Tamara Fagan

Electronic Theses and Dissertations

For decades, the United States has been known as the nation of immigrants due to the increasing number of immigrant students in the public school system. Although the population of immigrant students steadily increases annually, American society still pressures immigrants into acculturation to fulfill the United States ideals of academic achievement despite the United States claim of multiculturalism (Malcolm & Lowery, 2011). This research focuses on 1st - and 2nd generation immigrant students’ strife of acceptance in U.S. culture, while sill preserving their own native culture, and the influence it has on academic achievement. The researcher interviewed eight (8) adult …

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Currency In Transition: An Ethnographic Inquiry Of Bitcoin Adherents, Justin Fletcher Jan 2013

Currency In Transition: An Ethnographic Inquiry Of Bitcoin Adherents, Justin Fletcher

Electronic Theses and Dissertations

The Internet and other telecommunications systems have reshaped the means by which markets are accessed, generated, and transformed. Recent innovations in computer science have led to the development of a virtually bound, decentralized, encrypted currency system known as bitcoin. Unlike conventional currency systems, the Bitcoin protocol is cryptologically defined with a virtual structure that allows it to simultaneously operate as currency, commodity, and market shaping socio-political force. Its decentralized design permits it to function as a free-market response to fiat currencies vulnerable to inflation, regulation, and manipulation. Given the cultural significance anthropologists and other social scientists have assigned to various …

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Interpreting Diet And Nutritional Stress In Napoleon's Grand Army Using Stable Carbon And Nitrogen Isotope Analysis, Sammantha Holder Jan 2013

Interpreting Diet And Nutritional Stress In Napoleon's Grand Army Using Stable Carbon And Nitrogen Isotope Analysis, Sammantha Holder

Electronic Theses and Dissertations

A mass grave containing the remains of at least 3269 Napoleonic soldiers from 1812 was discovered in Vilnius, Lithuania in 2001. Stable carbon and nitrogen isotopic analyses were performed on collagen from 78 femoral samples to explore dietary variation within the sample. Starvation and nutritional distress were also evaluated through the examination of nitrogen enrichment in bone collagen. Clinical studies have demonstrated that enriched nitrogen isotope values can indicate periods of nutritional stress and starvation; however, this is the first study to examine its use as a diagnostic indicator of starvation in a historical population using bone tissue. According to …

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Naep-Related Visual Arts Assessment In Classroom Applications, Debra Mcgann Jan 2013

Naep-Related Visual Arts Assessment In Classroom Applications, Debra Mcgann

Electronic Theses and Dissertations

This action research study investigates classroom visual art assessments and their potential to improve teacher instruction and student learning. In order to examine this topic more thoroughly, a National Assessment of Educational Progress (NAEP)-related classroom assessment was designed and administered to the researcher’s Drawing and AP Art History classes. Students were also asked to fill out a questionnaire that asked about their past art experiences and motivation to participate in art activities such as creating artwork outside of the school setting or attending an art museum. Students observed, described, and analyzed contemporary artwork, and they created and wrote about their …

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A Study Of Student Achievement And Educational Intervention Strategies In Traditional And Virtual Format Algebra 1 Courses Within Volusia County School District, Paul Nehrig Jan 2013

A Study Of Student Achievement And Educational Intervention Strategies In Traditional And Virtual Format Algebra 1 Courses Within Volusia County School District, Paul Nehrig

Electronic Theses and Dissertations

The purpose of this study was to compare achievement results of students enrolled in traditional and virtual Algebra 1 courses in the School District of Volusia County, Florida and to identify which educational interventions are utilized by traditional and online teachers to promote student success, especially for at-risk populations. Two research questions guided this study. This study is significant, as school districts expand virtual options for K-12 students to meet legislative mandates and student demand, while also exploring and developing methods to ensure student success. Student scores on the Florida Algebra 1 End of Course Exam (EOC) were compared to …

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Utilizing Ipads To Enhance Student Engagement In Vocabulary Learning: A Case Study, Sarah Park Jan 2013

Utilizing Ipads To Enhance Student Engagement In Vocabulary Learning: A Case Study, Sarah Park

Electronic Theses and Dissertations

According to research evidence, the relationship between vocabulary and reading proficiency is so powerful that it is a valuable predictor of reading comprehension and academic achievement in the later school years (Scarborough, 2011). The major contributor to reading problem is the vocabulary demand of texts that students are assigned in school (Mckeown, Corsson, Arts, Sandora, & Beck, 2012). National Assessment of Education Progress (National Center for Education Statistics, 2012) stated the essential link between the words students know and students’ ability to use those words to understand what they read. Therefore, researchers and educators have both agreed the importance of …

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Theoretical And Computational Studies Of Diffusion Of Adatom Islands And Reactions Of Molecules On Surfaces, Syed Islamuddin Shah Jan 2013

Theoretical And Computational Studies Of Diffusion Of Adatom Islands And Reactions Of Molecules On Surfaces, Syed Islamuddin Shah

Electronic Theses and Dissertations

The work presented in this dissertation focuses on the study of post deposition spatial and temporal evolution of adatom islands and molecules on surfaces using ab initio and semiemperical methods. It is a microscopic study of the phenomena of diffusion and reaction on nanostructured surfaces for which we have developed appropriate computational tools, as well as implemented others that are available. To map out the potential energy surface on which the adatom islands and molecules move, we have carried out ab initio electronic structure calculations based on density functional theory (DFT) for selected systems. For others, we have relied on …

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Optically Isotropic Liquid Crystals For Display And Photonic Applications, Jin Yan Jan 2013

Optically Isotropic Liquid Crystals For Display And Photonic Applications, Jin Yan

Electronic Theses and Dissertations

For the past few decades, tremendous progress has been made on liquid crystal display (LCD) technologies in terms of stability, resolution, contrast ratio, and viewing angle. The remaining challenge is response time. The state-of-the-art response time of a nematic liquid crystal is a few milliseconds. Faster response time is desirable in order to reduce motion blur and to realize color sequential display using RGB LEDs, which triples the optical efficiency and resolution density. Polymer-stabilized blue phase liquid crystal (PS-BPLC) is a strong candidate for achieving fast response time because its self-assembled cubic structure greatly reduces the coherence length. The response …

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Computational Approach To The Problems Of Electro- And Photo-Catalysis, Sebastian Zuluaga Jan 2013

Computational Approach To The Problems Of Electro- And Photo-Catalysis, Sebastian Zuluaga

Electronic Theses and Dissertations

The main objective of this work is to gain basis for rational design of catalysts used in fuel cells for conversion of chemical energy stored in hydrogen molecules into electric energy, as well as photo-catalysts used for hydrogen production from water under solar irradiation. This objective is achieved by applying the first principles computational approach to reveal relationship among compositions of materials under consideration, their electronic structure and catalytic activity. A major part of the work is focused on electro-catalysts for hydrogen fuel cells. Platinum (Pt) is widely used in the electrodes of fuel cells due to its good catalytic …

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Inverse Problems In Multiple Light Scattering, John Broky Jan 2013

Inverse Problems In Multiple Light Scattering, John Broky

Electronic Theses and Dissertations

The interaction between coherent waves and material systems with complex optical properties is a complicated, deterministic process. Light that scatters from such media gives rise to random fields with intricate properties. It is common perception that the randomness of these complex fields is undesired and therefore is to be removed, usually through a process of ensemble averaging. However, random fields emerging from light matter interaction contain information about the properties of the medium and a thorough analysis of the scattered light allows solving specific inverse problems. Traditional attempts to solve these kinds of inverse problems tend to rely on statistical …

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Reduced Susceptibility Of Deformation Due To Vibrational And Gravitational Effects On A Focus Variable Adaptive Lens, Victoriya Relina Jan 2013

Reduced Susceptibility Of Deformation Due To Vibrational And Gravitational Effects On A Focus Variable Adaptive Lens, Victoriya Relina

Electronic Theses and Dissertations

Orthodox optical devices, such as lenses, mirrors, and prisms, are composed of solidstate materials, which although well studied and implemented ubiquitously are severely limited in their adaptable properties. An arguably new field of adaptive optics has emerged to further expand photonic manipulation competences of optical components. Fluid-based adaptive optical components were introduced as early as 1968 [1]; such components have the ability to change the shape of their interface surface, thus allowing for a variable curvature profile. The method of manipulation varies greatly, as does the range of surface deformations. A solid-state optical component is affected by system vibration variation …

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Mechanochemistry For Solid-State Syntheses And Catalysis, David Restrepo Jan 2013

Mechanochemistry For Solid-State Syntheses And Catalysis, David Restrepo

Electronic Theses and Dissertations

Traditional methods of synthesizing inorganic materials, such as hydrothermal, sol-gel, calcination and grinding steps, can typically require use of high temperatures, expensive precursors or use of solvents. Because of the energy-intensive nature or environmental impact these techniques, there is a push, especially from an industrial perspective, to move towards greener approaches. Mechanochemistry is a solvent-free alternative technique that can be used to synthesize a variety of materials under ambient conditions. Due to this, there is an increase in attention towards the use of this approach in both solid-state inorganic and organic chemistry. This dissertation reports the mechanochemical synthesis of a …

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A Comparison Of Students' And Parents' Mathematics Attitudes And Achievement At A Private Historically Black University, Kristopher Childs Jan 2013

A Comparison Of Students' And Parents' Mathematics Attitudes And Achievement At A Private Historically Black University, Kristopher Childs

Electronic Theses and Dissertations

The focus of this research was to compare students’ and their parents’ mathematical attitudes using the Attitudes Towards Mathematics Instrument (ATMI). The sample consisted of 476 newly-enrolled students and 263 parents attending the New Student Orientation and Leadership program at a private historically black university. The sample was predominantly African American, with 96% of the students and 95% of the parents identifying themselves as African American. The ATMI total score and subscale scores of self-confidence, value, enjoyment, and motivation were explored to determine if there was a relationship between the mathematics attitudes of students enrolled at a private historically black …

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Theoretical Studies Of Nanostructure Formation And Transport On Surfaces, Maral Aminpour Jan 2013

Theoretical Studies Of Nanostructure Formation And Transport On Surfaces, Maral Aminpour

Electronic Theses and Dissertations

This dissertation undertakes theoretical and computational research to characterize and understand in detail atomic configurations and electronic structural properties of surfaces and interfaces at the nano-scale, with particular emphasis on identifying the factors that control atomic-scale diffusion and transport properties. The overarching goal is to outline, with examples, a predictive modeling procedure of stable structures of novel materials that, on the one hand, facilitates a better understanding of experimental results, and on the other hand, provide guidelines for future experimental work. The results of this dissertation are useful in future miniaturization of electronic devices, predicting and engineering functional novel nanostructures. …

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Solid Phase Extraction Room Temperature Fluorescence Spectroscopy For The Direct Quantification Of Monohydroxy Metabolites Of Polycyclic Aromatic Hydrocarbons In Urine Samples, Korina Jesusa Calimag Jan 2013

Solid Phase Extraction Room Temperature Fluorescence Spectroscopy For The Direct Quantification Of Monohydroxy Metabolites Of Polycyclic Aromatic Hydrocarbons In Urine Samples, Korina Jesusa Calimag

Electronic Theses and Dissertations

Polycyclic aromatic hydrocarbons (PAH) are important environmental pollutants generally formed during incomplete combustion of organic matter containing carbon and hydrogen. Introduced into the human body by adsorption through the skin, ingestion or inhalation, the biotransformation processes of PAH lead to the formation of multiple metabolites. Due to the short elimination lifetime from the body, the quantitative determination of monohydroxy-PAH (OH-PAH) in urine samples provides accurate information on recent exposure to environmental PAH. Urine analysis of OH-PAH with established methodology relies on sample clean-up and pre-concentration followed by chromatographic separation and quantification. Although chromatographic techniques provide reliable results in the analysis …

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Remediation Of Polychlorinated Biphenyl (Pcb) Contaminated Building Materials Using Non-Metal And Activated Metal Treatment Systems, Tamra Legron-Rodriguez Jan 2013

Remediation Of Polychlorinated Biphenyl (Pcb) Contaminated Building Materials Using Non-Metal And Activated Metal Treatment Systems, Tamra Legron-Rodriguez

Electronic Theses and Dissertations

PCBs are recalcitrant compounds of no known natural origin that persist in the environment despite their ban by the United States Environmental Protection Agency in 1979 due to negative health effects. Transport of PCBs from elastic sealants into concrete, brick, and granite structures has resulted in the need for a technology capable of removing these PCBs from the materials. This research investigated the use of a nonmetal treatment system (NMTS) and an activated metal treatment system (AMTS) for the remediation and degradation of PCBs from concrete, brick, and granite affixed with PCB-laden caulking. The adsorption of PCBs onto the components …

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Enhanced Two-Photon Absorption In A Squaraine-Fluorene-Squaraine Dye: Design, Synthesis, Photophysical Properties, And Solvatochromic Behavior, William Moreshead Jan 2013

Enhanced Two-Photon Absorption In A Squaraine-Fluorene-Squaraine Dye: Design, Synthesis, Photophysical Properties, And Solvatochromic Behavior, William Moreshead

Electronic Theses and Dissertations

The discovery of any new technology is usually accompanied by a need for new or improved materials which make that technology useful in practical applications. In the case of two-photon absorption (2PA) this has truly been the case. Since its first demonstration in 1961, there has been an ever increasing quest to understand the relationships between two-photon absorption and the structure of two-photon absorbing materials. This quest has been motivated by the many applications for 2PA which have been reported, including fluorescence bioimaging, 3D microfabrication, 3D optical data storage, upconverted lasing, and photodynamic therapy. The work presented in this dissertation …

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Development Of Micro Volume Dna And Rna Profiling Assays To Identify The Donor And Tissue Source Of Origin Of Trace Forensic Biological Evidence, Brittany Morgan Jan 2013

Development Of Micro Volume Dna And Rna Profiling Assays To Identify The Donor And Tissue Source Of Origin Of Trace Forensic Biological Evidence, Brittany Morgan

Electronic Theses and Dissertations

In forensic casework analysis it is necessary to obtain genetic profiles from increasingly smaller amounts of biological material left behind by perpetrators of crime. The ability to obtain profiles from trace biological evidence is demonstrated with so-called ‘touch DNA evidence’ which is perceived to be the result of DNA obtained from shed skin cells transferred from donor to an object or person during physical contact. However, the current method of recovery of trace DNA involves cotton swabs or adhesive tape to sample an area of interest. This "blindswabbing" approach may result in the recovery of biological material from different individuals …

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Squaraine Dyes, Design And Synthesis For Various Functional Materials Applications, Yuanwei Zhang Jan 2013

Squaraine Dyes, Design And Synthesis For Various Functional Materials Applications, Yuanwei Zhang

Electronic Theses and Dissertations

This dissertation contains the synthesis and characterization of squaraine based new functional materials. In the first part of this thesis work, a water soluble benzothiazolium squaraine dye was synthesized with pyridium pendents, and controlled aggregation properties were achieved. After formation of partially reversible J-aggregation on a polyelectrolyte (poly(acryl acid) sodium salt) template, the nonlinear, two-photon absorption cross section per repeat unit was found to be above 30-fold enhanced compared with nonaggregate and/or low aggregates. Using a similar strategy, sulfonate anions were introduced into the squaraine structure, and the resulting compounds exhibited good water solubilities. A ‘turn on’ fluorescence was discovered …

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Quasi-Experimental Study: The Effects Of Virtual Covert Audio Coaching On Teachers' Transfer Of Knowledge From Professional Development To Classroom Practice, Marilyn Jackson-Lee Jan 2013

Quasi-Experimental Study: The Effects Of Virtual Covert Audio Coaching On Teachers' Transfer Of Knowledge From Professional Development To Classroom Practice, Marilyn Jackson-Lee

Electronic Theses and Dissertations

A quasi-experimental multiple time series design was used to analyze and compare the impact of two types of instructional coaching, face-to-face and virtual covert audio provided with Bluetooth technology, on teacher transfer of knowledge learned in professional development into classroom practice. Teacher transfer across baseline, intervention, and maintenance phases was analyzed. The study was conducted at a public elementary school in a Florida suburban school district with approximately 750 students. Twelve teachers were randomly selected from teachers who volunteered to attend professional development. Six teachers (one from each grade level K-5) in the treatment group received virtual covert audio coaching. …

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Deconstructing Differences In Effectiveness Of Reading Teachers Of Ninth Grade Non-Proficient Readers In One Florida School District, Jason Wysong Jan 2013

Deconstructing Differences In Effectiveness Of Reading Teachers Of Ninth Grade Non-Proficient Readers In One Florida School District, Jason Wysong

Electronic Theses and Dissertations

This study was undertaken to identify specific instructional and professional differences between the most effective and least effective teachers of ninth grade students enrolled in intensive reading courses in one Florida school district. Teachers from eleven schools were invited to complete a survey that included categorical, Likert, and openended response items. Principals and assistant principals at these schools were also invited to complete a similar survey. Teacher respondents were then divided into three effectiveness groups based on the percentage of their students who met 2011-2012 FCAT performance targets established by Florida’s value-added learning growth model. Inferential statistics were used to …

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Numerical Simulations For The Flow Of Rocket Exhaust Through A Granular Medium, Kristina Kraakmo Jan 2013

Numerical Simulations For The Flow Of Rocket Exhaust Through A Granular Medium, Kristina Kraakmo

Electronic Theses and Dissertations

Physical lab experiments have shown that the pressure caused by an impinging jet on a granular bed has the potential to form craters. This poses a danger to landing success and nearby spacecraft for future rocket missions. Current numerical simulations for this process do not accurately reproduce experimental results. Our goal is to produce improved simulations to more accurately and effi- ciently model the changes in pressure as gas flows through a porous medium. A two-dimensional model in space known as the nonlinear Porous Medium Equation as it is derived from Darcy’s law is used. An Alternating-Direction Implicit (ADI) temporal …

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Engineering And Application Of Ultrafast Laser Pulses And Filamentation In Air, Nicholas Barbieri Jan 2013

Engineering And Application Of Ultrafast Laser Pulses And Filamentation In Air, Nicholas Barbieri

Electronic Theses and Dissertations

Continuing advances in laser and photonic technology has seen the development of lasers with increasing power and increasingly short pulsewidths, which have become available over an increasing range of wavelengths. As the availability of laser sources grow, so do their applications. To make better use of this improving technology, understanding and controlling laser propagation in free space is critical, as is understanding the interaction between laser light and matter. The need to better control the light obtained from increasingly advanced laser sources leads to the emergence of beam engineering, the systematic understanding and control of light through refractive media and …

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Terrorism: The Effect Of Positive Social Sanctions, Curtis Hibbert Jan 2013

Terrorism: The Effect Of Positive Social Sanctions, Curtis Hibbert

Electronic Theses and Dissertations

Research shows that relative deprivation, mental illness, culture, ideology, and various forms of social learning are often identified as factors that can lead an individual to terrorism. However, understanding the value of influences in the form of positive social sanctions through social contact has not been fully explored throughout terrorist studies. In regards to influencing behavior, positive social sanctions elicit a desired behavior which is reinforced through praise or rewards. By utilizing a case study approach, this thesis looks to determine the significance of positive social sanctions through social contact on select individuals who have committed an act of terror …

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