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Detecting Threats From Constituent Parts: A Fuzzy Signal Detection Theory Analysis Of Individual Differences, Ida Van De Car Jan 2015

Detecting Threats From Constituent Parts: A Fuzzy Signal Detection Theory Analysis Of Individual Differences, Ida Van De Car

Electronic Theses and Dissertations

Signal detection theory (SDT) provides a theoretical framework for describing performance on decision making tasks, and fuzzy signal detection theory (FSDT) extends this description to include tasks in which there are levels of uncertainty regarding the categorization of stimulus events. Specifically, FSDT can be used to quantify the degree to which an event is 'signal-like', i.e., the degree to which a stimulus event can be characterized by both signal and non-signal properties. For instance, an improvised explosive device (IED) poses little threat when missing key elements of its assembly (a stimulus of low, but not zero, signal strength) whereas the …

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Convective Heat Transfer In Quasi-One-Dimensional Magnetic Fluid In Horizontal Field And Temperature Gradients, Jun Huang Jan 2015

Convective Heat Transfer In Quasi-One-Dimensional Magnetic Fluid In Horizontal Field And Temperature Gradients, Jun Huang

Electronic Theses and Dissertations

In this work we studied the convective heat transfer in a magnetic fluid in both zero and applied magnetic fields. The natural convection is observed in a quasi-one dimensional magnetic fluid in a horizontal temperature gradient. The horizontal non-homogeneous magnetic fields were applied across the sample cell either parallel or anti-parallel to the temperature gradient. The temperature profile was measured by eight thermocouples and temperature sensitive paint. The flow velocity field and streamlines were obtained by optical flow method. Calculated Nusselt numbers, Rayleigh number, and Grashof number show that the convective flow is the main heat transfer mechanism in applied …

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Establishing And Clarifying The Roles And Responsibilities Of K-12 Mathematics Coaches In A Rural Urban School District In Central Florida, Beth Davis Jan 2015

Establishing And Clarifying The Roles And Responsibilities Of K-12 Mathematics Coaches In A Rural Urban School District In Central Florida, Beth Davis

Electronic Theses and Dissertations

This dissertation in practice establishes roles and responsibilities for K-12 mathematics coaches in a rural, urban school district in central Florida. To do this, coach roles and responsibilities from existing coaching approaches were examined. The roles and responsibilities were closely examined for alignment with the objectives of the work of the coach – improving instruction and increasing student achievement. The result was proposed roles and responsibilities for K-12 mathematics coaches in a targeted district in central Florida. Review of the literature found that clearly delineated and communicated roles and responsibilities are vital to the success of mathematics coaches. Poorly defined …

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Development Of A Nano-Sensing Approach And A Portable Prototype For Real-Time Detection And Quantification Of Free Mercury In Stream-Flow: Combining Science And Engineering In Pro Of The Environment, Warinya Chemnasiri Jan 2015

Development Of A Nano-Sensing Approach And A Portable Prototype For Real-Time Detection And Quantification Of Free Mercury In Stream-Flow: Combining Science And Engineering In Pro Of The Environment, Warinya Chemnasiri

Electronic Theses and Dissertations

Mercury (Hg) is a well-known hazardous environmental contaminant existing in several forms, but all are toxic to human in one way or the others. Since Hg usually settles into water polluting the environment and accumulating in living organisms, it is crucial to monitor Hg levels in the aquatic ecosystem. Although there are many well established techniques currently used to detect Hg, most of them require elaborate and time-consuming sample preparation and pre-concentration procedures, as well as costly and bulky equipment that limit their practical application in the field. In order to overcome the existent limitations in Hg determination methods, Hernandez …

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Transverse Mode Selection And Brightness Enhancement In Laser Resonators By Means Of Volume Bragg Gratings, Brian Anderson Jan 2015

Transverse Mode Selection And Brightness Enhancement In Laser Resonators By Means Of Volume Bragg Gratings, Brian Anderson

Electronic Theses and Dissertations

The design of high power lasers requires large mode areas to overcome various intensity driven nonlinear effects. Increasing the aperture size within the laser can overcome these effects, but typically result in multi-transverse mode output and reduced beam quality, limiting the brightness of the system. As one possible solution, the angular selectivity of a diffractive optical element is proposed as a spatial filter, allowing for the design of compact high brightness sources not possible with conventional methods of transverse mode selection. This thesis explores the angular selectivity of volume Bragg gratings (VBGs) and their use as spatial transverse mode filters …

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Nano And Nanostructured Materials For Optical Applications, Panit Chantharasupawong Jan 2015

Nano And Nanostructured Materials For Optical Applications, Panit Chantharasupawong

Electronic Theses and Dissertations

Nano and nanostructured materials offer unique physical and chemical properties that differ considerably from their bulk counterparts. For decades, due to their fascinating properties, they have been extensively explored and found to be beneficial in numerous applications. These materials are key components in many cutting-edge optic and photonic technologies, including photovoltaics, waveguides and sensors. In this dissertation, the uses of nano and nanostructured materials for optical applications are investigated in the context of optical limiting, three dimensional displays, and optical sensing. Nanomaterials with nonlinear optical responses are promising candidates for self-activating optical limiters. In the first part of this study, …

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Investigating New Guaiazulenes And Diketopyrropyrroles For Photonic Applications, Ebrahim Ghazvini Zadeh Jan 2015

Investigating New Guaiazulenes And Diketopyrropyrroles For Photonic Applications, Ebrahim Ghazvini Zadeh

Electronic Theses and Dissertations

?-Conjugated systems have been the focus of study in recent years in order to understand their charge transport and optical properties for use in organic electronic devices, fluorescence bioimaging, sensors, and 3D optical data storage (ODS), among others. As a result, several molecular building blocks have been designed, allowing new frontiers to be realized. While various successful building blocks have been fine-tuned at both the electronic and molecular structure level to provide advanced photophysical and optoelectronic characteristics, the azulene framework has been under-appreciated despite its unique electronic and optical properties. Among several attributes, azulenes are vibrant blue naturally occurring hydrocarbons …

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Mahalanobis Kernel-Based Support Vector Data Description For Detection Of Large Shifts In Mean Vector, Vu Nguyen Jan 2015

Mahalanobis Kernel-Based Support Vector Data Description For Detection Of Large Shifts In Mean Vector, Vu Nguyen

Electronic Theses and Dissertations

Statistical process control (SPC) applies the science of statistics to various process control in order to provide higher-quality products and better services. The K chart is one among the many important tools that SPC offers. Creation of the K chart is based on Support Vector Data Description (SVDD), a popular data classifier method inspired by Support Vector Machine (SVM). As any methods associated with SVM, SVDD benefits from a wide variety of choices of kernel, which determines the effectiveness of the whole model. Among the most popular choices is the Euclidean distance-based Gaussian kernel, which enables SVDD to obtain a …

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Undergraduate Prescription Stimulant Misuse: The Impact Of Academic Strain, Social Norms, And Gender, Lauren Norman Jan 2015

Undergraduate Prescription Stimulant Misuse: The Impact Of Academic Strain, Social Norms, And Gender, Lauren Norman

Electronic Theses and Dissertations

This study investigates the misuse of prescription stimulants among undergraduates for a variety of different purposes, including: academic, other instrumental, and recreational. This research is important as existing literature as well as national level surveillance data indicates a substantial increase in this type of prescription drug misuse, especially among young adults aged 18-25. Drawing from several theoretical frameworks, this research focuses on how academic strain, social norms, and gender influence prescription stimulant misuse among undergraduates. Roughly 900 quantitative surveys were collected that specifically address undergraduate prescription stimulant misuse. The results indicate that college students are at an increased likelihood of …

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Three Essays On Compensation And The Board Of Directors, Ian Cherry Jan 2015

Three Essays On Compensation And The Board Of Directors, Ian Cherry

Electronic Theses and Dissertations

In my first essay, I find a statistically and economically significant director-specific component in CEO pay following the enactment of the Sarbanes-Oxley Act of 2002 (SOX). In the cross-section of firms, directors that award relatively higher (lower) CEO pay in one firm also award relatively higher (lower) CEO pay in other firms of whose boards they are members during the year. Based on my estimates, the director-specific component is responsible for around ±3.5% of total CEO pay or around ±$230,000 per CEO-year on average. In addition to affecting CEO pay levels, the director-specific component also has a significant effect on …

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The Subject Librarian Newsletter, Creol, Fall 2015, Patti Mccall Jan 2015

The Subject Librarian Newsletter, Creol, Fall 2015, Patti Mccall

Libraries' Newsletters

No abstract provided.

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What Is The Effect Of Standardized Testing On Teacher Practice?, Courtney Granato Jan 2015

What Is The Effect Of Standardized Testing On Teacher Practice?, Courtney Granato

HIM 1990-2015

This study examines the potential correlation between standardized testing and teacher practice. Building upon the conceptual framework, are constructs of school climate and assessment to develop themes such as leadership role, teacher role, district role, and coach’s role as well as teacher practice, classroom assessment, standardized assessment, and the alignment of curriculum to standardized testing. In discovering the parallel between standardized testing and teacher practice, both qualitative and quantitative data were collected through research and observations, but more importantly through a survey and focus group. Over a two-semester period, it became evident that there was an eminent parallel between each …

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The Innovator, Volume 3 Issue 6, Winter 2014-2015, Christa Santos Jan 2015

The Innovator, Volume 3 Issue 6, Winter 2014-2015, Christa Santos

The Innovator

No abstract provided.

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A Cooperative Path Planning Algorithm For A Multiple Mobile Robot System In A Dynamic Environment, Wentao Yu, Jun Peng, Xiaoyong Zhang, Kuo-Chi Lin Jan 2015

A Cooperative Path Planning Algorithm For A Multiple Mobile Robot System In A Dynamic Environment, Wentao Yu, Jun Peng, Xiaoyong Zhang, Kuo-Chi Lin

Faculty Bibliography 2010s

A practical path planning method for a multiple mobile robot system (MMRS) requires handling both the collision-free constraint and the kinematic constraint of real robots, the latter of which has to date been neglected by most path planning methods. In this paper, we present a practical cooperative path planning algorithm for MMRS in a dynamic environment. First, each robot uses an analytical method to plan an obstacle-avoidance path. Then, a distributed prioritized scheme is introduced to realize cooperative path planning. In the scheme, each robot calculates a priority value according to its situation at each instant in time, which will …

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Underlying Scaling Relationships Between Solar Activity And Geomagnetic Activity Revealed By Multifractal Analyses, Zu-Guo Yu, Vo Anh, Richard Eastes Jan 2015

Underlying Scaling Relationships Between Solar Activity And Geomagnetic Activity Revealed By Multifractal Analyses, Zu-Guo Yu, Vo Anh, Richard Eastes

Faculty Bibliography 2010s

This paper identifies some scaling relationships between solar activity and geomagnetic activity. We examine the scaling properties of hourly data for two geomagnetic indices (a(p) and AE), two solar indices (solar X-rays X-l and solar flux F10.7), and two inner heliospheric indices (ion density Ni and flow speed Vs) over the period 1995-2001 by the universal multifractal approach and the traditional multifractal analysis. We found that the universal multifractal model (UMM) provides a good fit to the empirical K(q) and tau(q) curves of these time series. The estimated values of the Levy index alpha in the UMM indicate that multifractality …

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The Effect Of Cognitively Guided Instruction On Students' Problem Solving Strategies And The Effect Of Students' Use Of Strategies On Their Mathematics Achievement, Nesrin Sahin Jan 2015

The Effect Of Cognitively Guided Instruction On Students' Problem Solving Strategies And The Effect Of Students' Use Of Strategies On Their Mathematics Achievement, Nesrin Sahin

Electronic Theses and Dissertations

The purpose of this study was to investigate the effect of teachers attending Cognitively Guided Instruction (CGI) professional development on students' problem solving strategies and the effect of students' use of strategies on their mathematics achievement as measured by a standardized test. First, the study analyzed the differences in students' use of strategies between treatment and control groups. The treatment was CGI professional development, and the teachers in the treatment group attended CGI workshops whereas the teachers in the control group did not. Next, the study analyzed the differences in the mathematics achievement of students between different strategy groups. A …

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The Perceived Effectiveness Of Mixed Reality Experiences In A Master Of Arts In Teaching (Mat) Program For Science, Technology, Engineering, And Mathematics Degreed Individuals, Chana Speir Jan 2015

The Perceived Effectiveness Of Mixed Reality Experiences In A Master Of Arts In Teaching (Mat) Program For Science, Technology, Engineering, And Mathematics Degreed Individuals, Chana Speir

Electronic Theses and Dissertations

The purpose of this study was to examine the perceived effectiveness of mixed reality experiences on resident teachers who successfully completed an undergraduate Science, Technology, Engineering, or Mathematics (STEM) degree and were enrolled in a Master of Arts in Teaching (MAT) degree program as part of RTP3 at a large research university in Orlando, Florida. The population for this study consisted of those selected to be in the RTP3, which included being in the Masters in the Art of Teaching (MAT) and becoming a middle or high school science, mathematics, or engineering teacher. The resident teachers experienced mixed reality as …

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Treatment Matching In Ptsd: A Confirmatory Factor Analysis Based On Therapeutic Mechanisms Of Action, Benjamin Trachik Jan 2015

Treatment Matching In Ptsd: A Confirmatory Factor Analysis Based On Therapeutic Mechanisms Of Action, Benjamin Trachik

Electronic Theses and Dissertations

The current study takes an initial step toward deriving a method for empirically based, theory-driven treatment matching in a military population suffering from PTSD. Along with the more overt symptoms of PTSD (e.g., persistent hyperarousal), secondary cognitive symptoms have also been shown to be significantly associated with avoidance and intrusive symptoms, as well as contribute to functional impairment. Based on the factor analytic and treatment literature for PTSD, it appears that there are two central mechanisms associated with beneficial therapeutic change that underlies both CPT and PE treatments (i.e., habituation, changes in cognitions). Additionally, different traumatic events and peritraumatic responses …

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Principals' Perceptions On Educating Elementary Students Who Are Gifted, Ingrid Cumming Jan 2015

Principals' Perceptions On Educating Elementary Students Who Are Gifted, Ingrid Cumming

Electronic Theses and Dissertations

Students who are gifted need student centered academic challenges and authentic problems to spark reflection and enhance student outcomes. When academic needs are not met,students who are gifted may not reach their full academic potential and may lose motivation for learning. A primary reason for students who are gifted to underachieve in academics is equated to school factors including lack of instructional resources, social/emotional support, and teachers who are unprepared to teach students who are gifted. The purpose of this phenomenological research study is to explore the perceptions and lived experiences of participating elementary school principals in an urban school …

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An Exploratory Comparison Of A Traditional And An Adaptive Instructional Approach For College Algebra, Ryan Kasha Jan 2015

An Exploratory Comparison Of A Traditional And An Adaptive Instructional Approach For College Algebra, Ryan Kasha

Electronic Theses and Dissertations

This research effort compared student learning gains and attitudinal changes through the implementation of two varying instructional approaches on the topic of functions in College Algebra. Attitudinal changes were measured based on the Attitude Towards Mathematics Inventory (ATMI). The ATMI also provided four sub-scales scores for self-confidence, value of learning, enjoyment, and motivation. Furthermore, this research explored and compared relationships between students' level of mastery and their actual level of learning. This study implemented a quasi-experimental research design using a sample that consisted of 56 College Algebra students in a public, state college in Florida. The sample was enrolled in …

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The Safe Removal Of Frozen Air From The Annulus Of A Liquid Hydrogen Storage Tank, Angela Krenn Jan 2015

The Safe Removal Of Frozen Air From The Annulus Of A Liquid Hydrogen Storage Tank, Angela Krenn

Electronic Theses and Dissertations

Large Liquid Hydrogen (LH2) storage tanks are vital infrastructure for NASA. Eventually, air may leak into the evacuated and perlite filled annular region of these tanks. Although the vacuum level is monitored in this region, the extremely cold temperature causes all but the helium and neon constituents of air to freeze. A small, often unnoticeable pressure rise is the result. As the leak persists, the quantity of frozen air increases, as does the thermal conductivity of the insulation system. Consequently, a notable increase in commodity boiloff is often the first indicator of an air leak. Severe damage can then result …

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Nanoscale Control Of Gap-Plasmon Enhanced Optical Processes, Chatdanai Lumdee Jan 2015

Nanoscale Control Of Gap-Plasmon Enhanced Optical Processes, Chatdanai Lumdee

Electronic Theses and Dissertations

Surface plasmon resonances of metal nanostructures have been studied intensely in recent years. The strong plasmon-mediated electric field enhancement and field confinement well beyond the diffraction limit has been demonstrated to improve the performance of optical devices including ultrasensitive sensors, light emitters, and optical absorbers. A plasmon resonance mode of particular recent interest is the gap plasmon resonance that occurs on closely spaced metallic structures. In contrast to plasmon resonances supported by isolated metal nanostructures, coupled nanostructures provide additional spectral and spatial control over the plasmon resonance response. For example, the resonance frequencies of metal nanoparticle dimers depend strongly on …

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Optical Propagation Of Self-Sustaining Wavefronts And Nonlinear Dynamics In Parabolic Multimode Fibers, Matthew Mills Jan 2015

Optical Propagation Of Self-Sustaining Wavefronts And Nonlinear Dynamics In Parabolic Multimode Fibers, Matthew Mills

Electronic Theses and Dissertations

The aim of this thesis is to introduce my work which has generally been focused on optical wavefronts that have the unusual property of resisting commonplace phenomena such as diffraction and dispersion. Interestingly, these special beams are found both in linear and nonlinear situations. For example, in the linear regime, localized spatio-temporal waves which resemble the spherical harmonic symmetries of the hydrogen quantum orbitals can simultaneously negotiate both diffractive and dispersive effects. In the nonlinear regime, dressed optical filaments can be arranged to propagate multi-photon produced plasma channels orders of magnitude longer than expected. The first portion of this dissertation …

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Urban School Principal Rated As Highly Effective: Support And Culture For Co-Teaching, Michelle San Jan 2015

Urban School Principal Rated As Highly Effective: Support And Culture For Co-Teaching, Michelle San

Electronic Theses and Dissertations

The recent revisions to the Individuals with Disabilities Education Improvement Act (2004) and the passing of the No Child Left Behind Act (2001) promoted a movement toward meaningful inclusion, which has led to an increase in interest in co-teaching (Friend, Cook, Hurley-Chamberlain, & Shamberger, 2010; Nichols, Dowdy, & Nichols, 2010). When co-teaching is effectively executed both students with and without disabilities benefit academically and socially (Friend & Cook, 2007). Researchers indicate that a key factor in effective co-teaching is administrative support (Friend et al.; Dieker & Murawski, 2003; Murawski & Dieker, 2008; Murawski & Dieker, 2004; Scruggs et al., 2007). …

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Modeling Autocorrelation And Sample Weights In Panel Data: A Monte Carlo Simulation Study, Parul Acharya Jan 2015

Modeling Autocorrelation And Sample Weights In Panel Data: A Monte Carlo Simulation Study, Parul Acharya

Electronic Theses and Dissertations

This dissertation investigates the interactive or joint influence of autocorrelative processes (autoregressive-AR, moving average-MA, and autoregressive moving average-ARMA) and sample weights present in a longitudinal panel data set. Specifically, to what extent are the sample estimates influenced when autocorrelation (which is usually present in a panel data having correlated observations and errors) and sample weights (complex sample design feature used in longitudinal data having multi-stage sampling design) are modeled versus when they are not modeled or either one of them is taken into account. The current study utilized a Monte Carlo simulation design to vary the type and magnitude of …

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Towards High-Flux Isolated Attosecond Pulses With A 200 Tw Cpa, Eric Cunningham Jan 2015

Towards High-Flux Isolated Attosecond Pulses With A 200 Tw Cpa, Eric Cunningham

Electronic Theses and Dissertations

Attosecond pulses have been developed as a means for investigating phenomena that proceed on the order of the atomic unit of time (24 as). Unfortunately, these extreme ultraviolet (XUV) pulses by themselves contain too few photons to initiate nonlinear dynamics or dress states in an attosecond pump--attosecond probe scheme. As a result, most attosecond experiments thus far have featured complementary near infrared (NIR) femtosecond lasers for instigating electron dynamics. In order to access the benefits of all-attosecond measurements and open attosecond physics to new fields of exploration, the photon flux of these pulses must be increased. One way to boost …

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Increasing Metalinguistics Awareness As A Necessary Precursor For Preservice Teachers, Aimee Schoonmaker Jan 2015

Increasing Metalinguistics Awareness As A Necessary Precursor For Preservice Teachers, Aimee Schoonmaker

Electronic Theses and Dissertations

Metalinguistic awareness (MA) in the context of the present study is the ability to deconstruct and analyze a language's intricate systems, and by doing so, better understand how these systems work. More specifically for the present study, the investigation focused on preservice teachers' MA in relation to grammar and its importance for their future students' understanding of language. Language is at the core of any content area in students' academic lives and it will continue to permeate all aspects of their studies at all ages. As such, language-related issues should be at the front and center of preservice teachers' preparation. …

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Optimization Of Molecular Beacon-Based Multicomponent Probes For Analysis Of Nucleic Acids, Maria Stancescu Jan 2015

Optimization Of Molecular Beacon-Based Multicomponent Probes For Analysis Of Nucleic Acids, Maria Stancescu

Electronic Theses and Dissertations

Detection of single nucleotide substitutions (SNS) in DNA and RNA has a growing importance in biology and medicine. One traditional approach for recognition of SNS takes advantage of hybridization probes that bind target nucleic acids followed by measuring ?Tm, the difference in melting temperatures of matched and mismatched hybrids. The approach enables SNS differentiation at elevated temperatures (usually 40-65oC) often only in a narrow range of < 10oC and requires high-resolution melting devices. Here we demonstrate that a specially designed DNA probe (X sensor) can broaden ?Tm from ~10oC to ~16oC and distinguish SNS in the interval of ~5-40oC. Therefore, there is no need for heating or measuring Tm for accurate SNS differentiation. Our data indicate that this wide differentiation range is in part due to the non-equilibrium hybridization conditions. Further we explored the idea that it is possible to improve the performance of an X sensor operable in close to equilibrium conditions by shifting its operability to non-equilibrium conditions. One way to achieve this is to introduce as many as possible structured ligands in analyte's dissociated state. Here we show that by introducing the maximum possible conformational constraints in X probe it is possible to shift its operation to non-equilibrium conditions and to improve its selectivity at temperatures < 15oC. Thus, this work points towards a new strategy for the design of highly selective hybridization sensors which operate in non-equilibrium conditions at close to room temperature. The X sensors could be utilized in qPCR, microarrays, as well as RNA analysis in living cells and for ambient temperature point-of-care diagnostics. In the last part of this work, X sensors were used in real time detection of PCR products. The sensors were optimized to operate in PCR buffer with optimal Mg2+ concentration. They were able to detect the target amplicon together with nonspecific products. The results presented here suggest that X sensors might be adopted for real time PCR format.

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Investigation Of Optical And Electronic Properties Of Au Decorated Mos2, Udai Bhanu Jan 2015

Investigation Of Optical And Electronic Properties Of Au Decorated Mos2, Udai Bhanu

Electronic Theses and Dissertations

Achieving tunability of two dimensional (2D) transition metal dichalcogenides (TMDs) functions calls for the introduction of hybrid 2D materials by means of localized interactions with zero dimensional (0D) materials. A metal-semiconductor interface, as in gold (Au) - molybdenum disulfide (MoS2), is of great interest from the standpoint of fundamental science as it constitutes an outstanding platform to investigate optical and electronic properties due to charge transfer. The applied aspects of such systems introduce new options for electronics, photovoltaics, detectors, catalysis, and biosensing. Here in this dissertation, we study the charge transfer interaction between Au nanoparticals and MoS2 flakes and its …

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Strategies For Enhanced Genetic Analysis Of Trace Dna From Touch Dna Evidence And Household Dust, Katherine Farash Jan 2015

Strategies For Enhanced Genetic Analysis Of Trace Dna From Touch Dna Evidence And Household Dust, Katherine Farash

Electronic Theses and Dissertations

In forensic casework it is often necessary to obtain genetic profiles from crime scene samples that contain increasingly smaller amounts of genetic material, called Low Template DNA (LTDNA). Two examples of LTDNA sources are touch DNA evidence and dust bunnies. Touch DNA refers to DNA that is left behind through casual contact of a donor with an object or another person. Touch DNA can be used to prove a suspect was present at a crime scene. Dust bunnies, or dust conglomerates, typically contain trapped shed skin cells of anyone in the vicinity along with fibers, dirt, hair, and other trace …

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