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Articles 1141 - 1170 of 7696
Full-Text Articles in Entire DC Network
A Mathematical Model For Predicting Animal Population Persistence On Fragmented Landscapes, Allyson Jones
A Mathematical Model For Predicting Animal Population Persistence On Fragmented Landscapes, Allyson Jones
Electronic Theses and Dissertations, 2020-2023
The effects of roads, buildings, and cities on animal populations are widespread and, often times, disastrous. These structures fragment animals' homes, inhibiting their ability to obtain essential resources and to reproduce. The question arises then: Under what circumstances can an animal population persist in a fragmented landscape? To attempt to answer this question, we present a spatially explicit reaction-diffusion model with varying growth and diffusion rates that incorporates animal behavior at points where habitats are fragmented for four different habitats. The outcome of extinction or persistence of the animal population is determined by examining the effects of changing parameters on …
Ground Movements And Nonlinear-Inelastic Response Of Buildings Induced By Excavations In Glacial Clay Deposits, A. Felipe Uribe-Henao
Ground Movements And Nonlinear-Inelastic Response Of Buildings Induced By Excavations In Glacial Clay Deposits, A. Felipe Uribe-Henao
Electronic Theses and Dissertations, 2020-2023
The analysis of ground movements and nonlinear response of buildings induced by excavations in glacial clay deposits is conducted using finite element models built in PLAXIS2D and OpenSees. PLAXIS2D was used to simulate the performance of an urban cofferdam excavation braced with a concrete bracing system. Measured ground movements were compared with the computed response, and the influence of the temperature, installation, and curing effects on the concrete bracing is evaluated. Concrete time-dependent effects contributed to 32% of the maximum lateral wall movements. The numerical studies are expanded in a second finite element analysis to characterize the coupled fluid-solid response …
"I Drink (Responsibly), Therefore I Am": Development Of The Personal Assessment Of Responsible Drinking Identity, Angelina Leary
"I Drink (Responsibly), Therefore I Am": Development Of The Personal Assessment Of Responsible Drinking Identity, Angelina Leary
Electronic Theses and Dissertations, 2020-2023
PURPOSE: Identity has long been a human phenomenon, questioned and pondered by many thinkers. Recently, changes in identity have been argued to be the driving force behind behavioral change, and therefore interventions should be viewed within the context of identity change. While several measures of a drinker's identity exist, no measure examines the idiosyncrasies of a Responsible Drinker's Identity, an aim many alcohol-related interventions target. The current study created a responsible drinker identity measure, the Personal Assessment of Responsible Drinking Identity, or PARDI. METHOD: Two studies and a follow-up were used to develop and assess the psychometric properties of the …
Identification And Detection Of Cosmetics Transferred During Close Personal Attacks, Kandyss Najjar
Identification And Detection Of Cosmetics Transferred During Close Personal Attacks, Kandyss Najjar
Electronic Theses and Dissertations, 2020-2023
New types of trace evidence are necessary to account for the potential lack of evidence found during criminal investigations, due to perpetrators' awareness of common types such as latent prints, hair, and DNA. During cases involving close personal contact, such as sexual assault, perpetrators may not be aware of the possible transfer of cosmetics from or onto the victim or crime scene. Therefore, this project focused on analyzing and developing characterization schemes for cosmetic components, specifically glitter and shimmer particles. Analysis of these particles was performed using various analytical techniques, such as microscopy and spectroscopy techniques, and the developed characterization …
High Speed Modulation Characteristics Of Semiconductor Nanolasers And Coupled Ring Laser Systems, Chi Xu
High Speed Modulation Characteristics Of Semiconductor Nanolasers And Coupled Ring Laser Systems, Chi Xu
Electronic Theses and Dissertations, 2020-2023
Optical communication systems require light sources that can be modulated with high speeds. However, the modulation bandwidth of laser diodes is typically limited by an intrinsic value, its relaxation resonance frequency. In order to circumvent this limitation, a number of methods have been proposed to boost the modulation speed, including optical injection locking, quantum dots lasers with large differential gain, push-pull modulation in composite lasers. This dissertation explores two new approaches for enhancing the direct modulation bandwidth of semiconductor quantum well laser diodes. Lasers with strong spontaneous emission have been shown to exhibit a high-speed performance theoretically. It is expected …
Dual Beam Frequency Comb Ftir Spectroscopy, Connor Kelly
Dual Beam Frequency Comb Ftir Spectroscopy, Connor Kelly
Electronic Theses and Dissertations, 2020-2023
A visible and Infrared (IR) range dual beam frequency comb Fourier transform spectrometer was developed. Using dual mode-locked Ti:Sapphire lasers a comb-interferogram was generated in the visible range. This spectrum was calculated and used to measure the transmittance of a Nd-doped crystal. The system was further developed to generate an IR interferogram by Difference Frequency Generation (DFG) using a Gallium Selenide (GaSe) crystal placed in the mode-locked pump beam. Numerical work was done to calculate the expected DFG spectrum confirming the necessary IR range can be reached. This has been conducted in support of an IR holographic spectroscopic microscopy spatial …
Enhancement And Evaluation Of Proton Pencil Beam Spot Placement Algorithms, Mahboob Ur Rehman
Enhancement And Evaluation Of Proton Pencil Beam Spot Placement Algorithms, Mahboob Ur Rehman
Electronic Theses and Dissertations, 2020-2023
Intensity modulated proton therapy (IMPT) in the form of pencil beam scanning (PBS) has shown improvement in treatment plan quality as compared to conventional proton and photon-based radiotherapy techniques. However, in IMPT maintaining a sharp lateral dose falloff is crucial for sparing organs at risk (OARs), especially when they are in close proximity to the target volume. The most common approach to improve lateral dose falloff is through the use of physical beam shaping devices, such as brass apertures or collimator-based systems. This work has shown that IMPT can be further improved by implementation of advanced spot placement techniques by …
Safety And Operations Of Urban Arterials Incorporating The Context Classification System, Nada Mahmoud
Safety And Operations Of Urban Arterials Incorporating The Context Classification System, Nada Mahmoud
Electronic Theses and Dissertations, 2020-2023
Urban arterials connect multiple areas in the city and encourage non-motorist activities. Hence, the safety and operations on urban arterials is vital as they improve the mobility of daily commuters and road users. This research aims to facilitate traffic operations on urban arterials by proposing multiple mythological approaches to estimate and predict turning movement counts at signalized intersections using traffic data from adjacent intersections. Further, it aims to improve the safety by developing crash prediction models, identifying the hotspots for multiple crash types, and indicating the factors contributing to operating speed as well as non-motorist crashes. The analyses included tuning, …
Exploring New Materials As Promising Electrocatalysts For The Generation Of A Clean And Renewable Energy Source, Tyler Campbell
Exploring New Materials As Promising Electrocatalysts For The Generation Of A Clean And Renewable Energy Source, Tyler Campbell
Electronic Theses and Dissertations, 2020-2023
This work presents the research of myself, my advising professor, and our collaborators in first-principles studies of several catalytic materials for improving the efficiency and economics of hydrogen fuel cells, focusing on the oxygen reduction reaction (ORR) at the cathode, CO removal and the hydrogen oxidation reaction (HOR) at the anode, and the redox reactions used for water splitting through photocatalysis. We use a computational design approach to analyze the reaction thermodynamics, applying density functional theory (DFT) for most calculations. We find that, through a subversion of the linear scaling approximation for surface reactivity, an Au monolayer deposited on the …
Crash Analysis And Development Of Safety Performance Functions For Florida Roads In The Framework Of The Context Classification System, Ma'en Al-Omari
Crash Analysis And Development Of Safety Performance Functions For Florida Roads In The Framework Of The Context Classification System, Ma'en Al-Omari
Electronic Theses and Dissertations, 2020-2023
Nowadays, technology is employed in many safety applications and countermeasures that would enhance traffic safety by influencing some crash-related factors. Therefore, crash-related factors must be determined for every roadway element by the development of safety performance functions. Safety performance functions (SPF) are employed to predict crash counts at the different roadway elements. Several SPFs have been developed for the various roadway elements based on different classifications such as functional classification and area type. Since a more detailed classification of roadway elements leads to more accurate crash predictions, multiple states have developed new system to categorize roads based on a comprehensive …
Topology And Megnetism In F-Electron Systems, Firoza Kabir
Topology And Megnetism In F-Electron Systems, Firoza Kabir
Electronic Theses and Dissertations, 2020-2023
Topological insulators are insulators in the bulk but permit spin-polarized electrons to flow on their surface. Till date, non-magnetic topological materials have been extensively studied. However, due to the complex symmetries of magnetic crystals as well as theoretical and experimental difficulties associated with modeling and measuring quantum magnets, only a few magnetic materials have been explored so far. Therefore, by utilizing angle-resolved photoemission spectroscopy (ARPES), along with first-principles calculations, and magneto-transport measurements, we have chosen one doped and four intrinsic magnetic materials to study the interplay between magnetic order and nontrivial topology. First, we have observed a single topological non-trivial …
Development And Surface Science Investigations Of Epitaxial Thin Films Suitable For Elucidating Mechanisms Of Water Formation And Migration On The Moon, Bijoya Dhar
Electronic Theses and Dissertations, 2020-2023
The growth and characterization of epitaxial thin films see ubiquitous use in both research and applications spanning a number of scientific and industrial fields with overlapping interests in materials science. The central theme of this work centers on leveraging the structural control afforded through the ultrahigh vacuum (UHV) approaches to thin-film epitaxy to derive atomically specific structure-chemistry relationships of key importance to various interface-mediated reactions. The first project was aimed at developing gold (Au) and ceria (CeO2) thin films using advanced surface-science techniques. In that project, a thoroughly wetted Au film on Ta metal substrate has been identified. This model …
Superconductivity And Topological Properties In A Topological Semimetal, K A M Hasan Siddiquee
Superconductivity And Topological Properties In A Topological Semimetal, K A M Hasan Siddiquee
Electronic Theses and Dissertations, 2020-2023
Topological superconductors (TSCs) in which superconductivity and topological properties are combined are characterized by topologically protected gapless states in the superconducting gaps. Realized in the gapless states of TSCs, Majorana fermions, which are particles and their own antiparticles, have crucial importance in quantum computation and spintronic device applications because of the exotic nature. Despite extensive study for the confirmation of TSCs, the observation of Majorana fermions in bulk superconductors has not been settled yet. Recently, the binary stannide semimetal CaSn3 with a cubic structure has been proposed to be a promising candidate for realizing topological superconductivity. In this dissertation, to …
Directional Link Management Using In-Band Full-Duplex Free Space Optical Transceivers For Aerial Nodes, A F M Saniul Haq
Directional Link Management Using In-Band Full-Duplex Free Space Optical Transceivers For Aerial Nodes, A F M Saniul Haq
Electronic Theses and Dissertations, 2020-2023
Free-space optical (FSO) communication has become very popular for wireless applications to complement and, in some cases, replace legacy radio-frequency for advantages like unlicensed band, spatial reuse, and enhanced security. Even though FSO can achieve very high bit-rate (tens of Gbps), range limitation due to high attenuation and weather dependency has always restricted its practical implementation to indoor application like data centers and outdoor application like Project Loon. Building-to-building communication, smart cars, and airborne drones are potential futuristic wireless communication sectors for mobile ad-hoc FSO networking. Increasing social media usage demands high-speed mobile connectivity for applications like video call and …
Effectiveness Of Digital Interactive Experiment In Learning Outcomes And Engagement, Matin Salemirad
Effectiveness Of Digital Interactive Experiment In Learning Outcomes And Engagement, Matin Salemirad
Electronic Theses and Dissertations, 2020-2023
Despite some ongoing debates over the positive or negative impact of digital games, educational games are powerful tools to increase engagement and improve learning outcomes. Scientific concepts about the weather are complicated for younger learners and deep learning often requires long-term cultivation. This thesis presents a novel interactive educational simulation called the Science of Meteorology with Interactive Learning Experience (SMILE). In it, students interact with a touchscreen monitor to change weather conditions and learn about clouds and weather science. The relationship between engagement and learning outcomes and the effectiveness of the experience is evaluated using a formal user study. Online …
Analysis Of Sexual Lubricants As A Form Of Trace Evidence For Sexual Assault Cases, Brooke Baumgarten
Analysis Of Sexual Lubricants As A Form Of Trace Evidence For Sexual Assault Cases, Brooke Baumgarten
Electronic Theses and Dissertations, 2020-2023
A major gap in sexual assault casework is demonstrated when DNA is not recovered. Oftentimes, if DNA evidence is not present on the collection swabs, the sexual assault kit (SAK) is not further analyzed. Due to the "CSI effect," DNA is commonly understood as highly identifiable evidence, potentially leading to increased condom usage to eliminate or reduce DNA transfer during a sexual assault. Therefore, the analysis of condoms and sexual lubricants is pertinent. The purpose of this research is to develop analytical protocols to potentially connect unknown substances recovered in a SAK to known lubricant reference samples. Sexual lubricants were …
Learning Accurate And Robust Deep Visual Models, Yandong Li
Learning Accurate And Robust Deep Visual Models, Yandong Li
Electronic Theses and Dissertations, 2020-2023
Over the last decade, we have witnessed the renaissance of deep neural networks (DNNs) and their successful applications in computer vision. There is still a long way to build intelligent and reliable machine vision systems, but DNNs provide a promising direction. The goal of this thesis is to present a few small steps along this road. We mainly focus on two questions: How to design label-efficient learning algorithms for computer vision tasks? How to improve the robustness of DNN based visual models? Concerning label-efficiency, we investigate a reinforced sequential model for video summarization, a background hallucination strategy for high-resolution image …
A Deep Learning Approach For Learning Human Gait Signature, Alexander Matasa
A Deep Learning Approach For Learning Human Gait Signature, Alexander Matasa
Electronic Theses and Dissertations, 2020-2023
With advancements in biometric securities, focus has increased on utilizing gait as a means of recognition. Gait describes the unique walking pattern present in humans and has shown promising results in person re-identification tasks. Unlike other biometric features, gait is unique in that it is a subconscious behavior minimizing the risk of purposeful obfuscation. In this research, we first cover supervised approaches showing that current methods fail to learn a unique signature that describes the motion of a subject. Rather they extract frame-based feature information which is then aggregated. While these methods have shown to be effective, they do not …
Unusual Superconductivity In Topological Nodal Line Semimetal, Riffat Munir
Unusual Superconductivity In Topological Nodal Line Semimetal, Riffat Munir
Electronic Theses and Dissertations, 2020-2023
Unconventional superconductivity differs from the conventional one by the pairing mechanism. In conventional or s wave superconductor electrons with opposite spin and momentum form cooper pair and superconductivity occurs as a result of electron phonon interaction. In the unconventional superconductor pairing mechanism is different than that of conventional one , for example p wave pairing where electrons with similar direction of spin forms the cooper pair. Unconventional superconductivity has been observed in systems such as heavy fermion,cuprates, iron based superconductors etc. In recent years topological superconductivity has gained attention due to the combination of topological states in the band sturucture …
Evaluating Pmo Sync Implementation For Persistent Memory Object, Faishal Wahiduddin
Evaluating Pmo Sync Implementation For Persistent Memory Object, Faishal Wahiduddin
Electronic Theses and Dissertations, 2020-2023
Persistent Memory, in the form of byte-addressable Non-Volatile Memories (NVMs), provides a low-cost and high-capacity main memory, and provides the ability to store and retain data even when the system is powered off, along with improved performance over traditional storage. Persistent Memory Direct Access (DAX) enables applications to perform byte-addressable operations such as load and store. Filesystem-DAX can store persistent data in NVMs with system call overheads. In order to reduce filesystem overheads, this study utilizes Persistent Memory Object (PMO) as an abstraction for persistent data containers on Non-Volatile Memory (NVM). Persisting data in Persistent Memory Object requires that the …
The Use Of Physically Based Models And Ensemble Forecasting For Storm Surge Risk Assessment In A Changing Climate, Jeane Camelo
The Use Of Physically Based Models And Ensemble Forecasting For Storm Surge Risk Assessment In A Changing Climate, Jeane Camelo
Electronic Theses and Dissertations, 2020-2023
Storm surge has been the deadliest and costliest hurricane induced hazard in the coastal United States. In order to save property and lives, emergency managers must issue advisories guided by numerical models in a timely manner. However, these surge models are highly dependent on weather forecasts which contain uncertainties themselves as hurricanes traverse through the waters before making landfall. This dissertation aims to understand the contribution of uncertainties in hurricane properties, particularly the wind intensity which can contribute to uncertainties in storm surge models. Investigating these properties through numerical modeling is both computationally and time intensive. However by developing a …
An Asset-Based Approach To Problem-Based Learning In K-12 Stem, Samantha Heller
An Asset-Based Approach To Problem-Based Learning In K-12 Stem, Samantha Heller
Electronic Theses and Dissertations, 2020-2023
Educators and policymakers advocate for the implementation of problem-based approaches to STEM education in K-12 classrooms to help students develop 21st-century skills such as the ability to think critically, collaborate, and problem-solve. The first exploratory case study in this three-article dissertation examines how students engage in STEM-focused PBL experiences and the meaning of these experiences for the development of their STEM identities. The second study utilizes Braun and Clarke's reflective thematic analysis framework to explore the experience of a model STEM teacher at a high-performing STEM-focused elementary school as she implemented problem-based learning in the first year of a school-wide …
Stance And Engagement In Scientific Research Articles, Caoyuan Ma
Stance And Engagement In Scientific Research Articles, Caoyuan Ma
Electronic Theses and Dissertations, 2020-2023
Stance and engagement are important rhetorical resources for writers to construct interaction with readers and ideas by marking epistemic evaluation and bringing readers into the texts. Building on previous research that suggests notable differences in the use of stance and engagement in academic discourse, this comparative study investigates the use of stance and engagement in scientific research articles. By comparing two corpora that contain 144 research articles in total across 16 scientific disciplines, this study examines if the numbers of stance and engagement differ between manuscripts (unpublished research papers) that are produced by nonnative writers and those that are published …
The Effects Of A House System On School Improvement In Elementary Schools: School Climate And Academic Achievement, Carol-Ann Clenton-Martin
The Effects Of A House System On School Improvement In Elementary Schools: School Climate And Academic Achievement, Carol-Ann Clenton-Martin
Electronic Theses and Dissertations, 2020-2023
A regional area of a school district in central Florida used the implementation of a house system as a school improvement intervention to impact school climate and academic achievement. The purpose of this study was to determine if a house system is an effective school improvement intervention that has a positive effect on school climate and academic achievement of students in elementary schools. Four research questions were developed to investigate if there was a difference in elementary schools that implemented a house system and ones that did not during the 2018-2019 school year. All schools included in the study had …
Student Government: A Phenomenological Study Of Student Government Leaders, K. Bonnieblue Rodríguez-Valentín
Student Government: A Phenomenological Study Of Student Government Leaders, K. Bonnieblue Rodríguez-Valentín
Electronic Theses and Dissertations, 2020-2023
This phenomenological study investigated the transition process of student government leaders in a university setting. The study consisted of interviewing a total of 17 participants from Executive, Judicial, and Legislative branches, as well as the Election Commission. This study focused on finding the types of transitions student leaders experience while serving in student government, the meaning obtained from such transitions, and the impact succession planning and university personnel had on those transitions. Themes that emerged from the study included stress, conflict, advocacy, resiliency, and boundaries. Recommendations and future applications of the research findings were made to help guide higher education …
Performance-Based Funding: A Case Study Of Three Universities In The State Of Florida, Lucretia Cooney
Performance-Based Funding: A Case Study Of Three Universities In The State Of Florida, Lucretia Cooney
Electronic Theses and Dissertations, 2020-2023
An exploratory case study of three institutions of higher education in the State of Florida and performance-based funding was conducted. The study examined the metrics that determined funding over the years 2014-2020. The study was grounded in Neoliberal Theory and Resource Dependency Theory. Significant findings in this study included: (a) the decline in the percentage of bachelor graduates employed (employment was measured by $25,000 wages after graduation), or continuing their education across all three universities, (b) Student-to-Faculty Ratios (CDS) were a statistically significant predictor of Bachelor's Degrees Awarded (Key Performance Metric), F (1, 13) = 37.76, p < .001., (c) the increase of non-tenure earning over tenure-earning and tenured faculty at all three institutions during the fiscal years 2016-17 to 2020-21, and (d) fewer graduate degrees were awarded in the STEM disciplines over the time investigated. The study affirms the tenets of both Neoliberal Theory and Resource Dependency Theory. The study provided useful information for national performance-based funding programs, the Florida Board of Governors, the Boards of Trustees, and institutional stakeholders. Implications for practice include the need for more transparency and parity in reporting data across databases. Future research should conduct this same study including all of the institutions in the State of Florida.
Applications Of The Match Model To Analyze Student Problem-Solving, Barbara Chiu
Applications Of The Match Model To Analyze Student Problem-Solving, Barbara Chiu
Honors Undergraduate Theses
Problem-solving has been recognized as a critical skill that students lack in the current education system, due to the use of algorithmic questions in tests that can be simply memorized and solved without conceptual understanding. Research on student problem-solving is needed to gain deeper insight into how students are approaching problems and where they lack proficiency so that instruction can help students gain a conceptual understanding of chemistry. The MAtCH (methods, analogies, theory, context, how) model was recently developed from expert explanations of their research and could be a valuable model to identify key components of student problem-solving. This project …
Fake News And Women: Fake And Real Media's Impact On Sexism In Consumer Attitudes, Alexandra C. Oropallo
Fake News And Women: Fake And Real Media's Impact On Sexism In Consumer Attitudes, Alexandra C. Oropallo
Honors Undergraduate Theses
Gender-based discrimination is an issue that permeates many aspects of today's society and is influenced by numerous factors, including the presence of fake news, or emotionally driven, factually inaccurate, and misleading media. This study aimed to examine fake news' impact on consumer attitudes regarding women and to investigate how certain demographic factors relate to consumers' attitudes towards women. The current study had two main hypotheses: (1) participants exposed to fake news materials will report higher levels of both old-fashioned and modern sexism than those in other conditions and (2) participants with higher levels of sociodemographic factors such as right-wing authoritarianism …
Exploring Mesoscale Structures Using Chord Occultations Of Saturn's Rings, Lamia Benyamine
Exploring Mesoscale Structures Using Chord Occultations Of Saturn's Rings, Lamia Benyamine
Honors Undergraduate Theses
The Cassini spacecraft orbited Saturn for over 13 years and collected stellar occultations using an Ultraviolet Imaging Spectrograph (UVIS). Chord occultations were analyzed using autocorrelations at minimum ring plane radius to visualize the structure and correlation in the azimuthal direction. These particle tracking occultations cut a chord across the rings in the path of the star. By taking the autocorrelation of these chord occultations, 8 out of the 66 showed clumping within the first 3.0 km in azimuth, representing signs of a structure. Six of those occultations could be moonlets or propellers as their minimum ring plane radii are in …
Workspace And Kinematic Modeling And Analysis Of Semi-Robotic Laparoscopic Surgery, Immanuel E. Girgis
Workspace And Kinematic Modeling And Analysis Of Semi-Robotic Laparoscopic Surgery, Immanuel E. Girgis
Honors Undergraduate Theses
Laparoscopic Surgery has been revolutionized by the world of Surgical Robotics. Robot-Assisted Surgeries have been proven to have many advantages over the fundamental, traditional "by-hand" procedures previously conducted, and still currently being done for certain operations. Robot-assisted surgery may offer benefits to patients through the use of minimally invasive techniques, which may result in reduced blood loss, reduced blood transfusion, fewer complications, reduced postoperative pain, shorter hospital stays, and reduced recovery times (Ho et al., 2011). Studies have proven that robotic surgery may lead to patients recovering faster depending on the timeframe and the type of procedure (Tang et al., …