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Control Of Coherence In Attosecond Atomic Ionization, Saad Mehmood Jan 2022

Control Of Coherence In Attosecond Atomic Ionization, Saad Mehmood

Electronic Theses and Dissertations, 2020-2023

The motion of electrons in atoms, molecules, and in condensed matter unfolds on a time scale from the attosecond (1 as = 10-18 s) to several femtoseconds (1 fs= 10-15 s). The advent of attosecond light pulses has opened the way to the time-resolved study of electronic motion and of ionization processes using pump-probe spectroscopy. In this thesis, we examine three aspects of the ionization dynamics in poly-electronic atoms: i) the coherence of the emerging charged fragments, ii) two-photon ionization pathways, and iii) the reconstruction of photoionization amplitudes from experimental observable. We focus on the role of autoionizing states and …


Post-Crisis Organizational Learning Thresholds, Pitfalls And The Risk Of Repeated Crises: Clarifying The Discourse Of Renewal Theory, Rodrigo Soares Jan 2022

Post-Crisis Organizational Learning Thresholds, Pitfalls And The Risk Of Repeated Crises: Clarifying The Discourse Of Renewal Theory, Rodrigo Soares

Electronic Theses and Dissertations, 2020-2023

Through a case study analysis of repeated crises that impacted the same organization in Brazil, this dissertation aimed to solve an applied problem: the potential for unresolved or amplified risk for organizations and their stakeholders facing repeated crises due to incomplete post-crisis learning. This research expands and clarifies the understanding of organizational learning, particularly in the Discourse of Renewal theory, by exploring the potential for organizations to ascertain vital lessons for a crisis but fail to communicatively constitute them as central features of a renewed organization. The study investigated an organization's failure to avoid repeating a crisis within a relatively …


The Dialectics Of Ambivalent Identification In The Supervisor-Subordinate Dyad, Barret Vermilion Jan 2022

The Dialectics Of Ambivalent Identification In The Supervisor-Subordinate Dyad, Barret Vermilion

Electronic Theses and Dissertations, 2020-2023

Ambivalent interpersonal relationships in organizations are known to have deleterious effects on employee health and wellbeing, work performance, counterproductive work behaviors, and more. However, little research has examined ambivalent relationships in the supervisor-subordinate dyad. In the present study, I contribute to the supervisor-subordinate literature by examining the interaction between abusive supervision and supervisor support. Furthermore, I extend past findings by investigating the mediating role of ambivalent supervisor identification, hypothesizing that support in an otherwise abusive supervisor relationship will lead to ambivalent supervisor identification and, consequently, negative health outcomes. Finally, I explore the role of dialectical thinking style, an Eastern mode …


Attenuation Of Excess Tnfα Release In Crohn's Disease By Silencing Of Irhoms 1/2 And The Restoration Of Tgfβ-Mediated Immunosuppression Through The Modulation Of Tace Trafficking, Taylor Louis Jan 2022

Attenuation Of Excess Tnfα Release In Crohn's Disease By Silencing Of Irhoms 1/2 And The Restoration Of Tgfβ-Mediated Immunosuppression Through The Modulation Of Tace Trafficking, Taylor Louis

Electronic Theses and Dissertations, 2020-2023

Although treatment of Crohn's disease (CD) with TNFa monoclonal antibodies is beneficial, many patients stop responding over time and become at risk of acquiring infections. This study investigated an alternative approach to attenuate the release of excess TNFα by silencing iRHOMs 1/2 with the intention of restoring TGFβ-mediated Immunosuppression through Mitigation of TNFα converting enzyme (TACE) Trafficking. TACE, a transmembrane metalloprotease involved in signaling of receptors/cytokines/growth factors/adhesion proteins, is upregulated in CD, resulting in a marked increase of membranous TNFα cleavage and inflammation. Initially, we measured TGFβRII shedding in plasma from CD patients and healthy controls (N=40 per group). We …


Applications For Machine Learning On Readily Available Data From Virtual Reality Training Experiences, Alec Moore Jan 2022

Applications For Machine Learning On Readily Available Data From Virtual Reality Training Experiences, Alec Moore

Electronic Theses and Dissertations, 2020-2023

The purpose of the research presented in this dissertation is to improve virtual reality (VR) training systems by enhancing their understanding of users. While the field of intelligent tutoring systems (ITS) has seen value in this approach, much research into making use of biometrics to improve user understanding and subsequently training, relies on specialized hardware. Through the presented research, I show that with machine learning (ML), the VR system itself can serve as that specialized hardware for VR training systems. I begin by discussing my explorations into using an ecologically valid, specialized training simulation as a testbed to predict knowledge …


An Anthropological Study Of The Effects Of The Covid-19 Pandemic On Drug Treatment In The United States, Abigail Shepherd Jan 2022

An Anthropological Study Of The Effects Of The Covid-19 Pandemic On Drug Treatment In The United States, Abigail Shepherd

Electronic Theses and Dissertations, 2020-2023

This thesis examined the extent to which the COVID-19 pandemic has affected the structure of drug treatment in the United States and how the effects have influenced the experience of undergoing and providing services in a variety of contexts. The COVID-19 pandemic emerged amid an opioid epidemic, which has taken the lives of over 564,000 Americans since the late 1990s. With overdose deaths increasing since the onset of the pandemic and government agencies responding with policy changes, recent research in the social sciences and on drug treatment services has necessarily shifted its focus to the effects of the pandemic on …


Numerical Study Of Flow Of Supercritical Carbon Dioxide Inside Microchannels With Heat Transfer, Uday Manda Jan 2022

Numerical Study Of Flow Of Supercritical Carbon Dioxide Inside Microchannels With Heat Transfer, Uday Manda

Electronic Theses and Dissertations, 2020-2023

Heat transfer inside microscale geometries is a complex and a challenging phenomenon. As supercritical fluids display large variations in their properties in the vicinity of the critical point, their usage could be more beneficial than traditional coolants. This numerical study, in two parts, primarily focuses on the physics that drives the enhanced heat transfer characteristics of carbon dioxide (CO2) near its critical state and in its supercritical state. In the first part of the study, the flow of supercritical Carbon Dioxide (sCO2) over a heated surface inside a microchannel of hydraulic diameter 0.3 mm was studied using three-dimensional computational fluid …


Atmospheric Retrieval: Bayesian Methods, Machine Learning, And Application To Exoplanets, Michael Himes Jan 2022

Atmospheric Retrieval: Bayesian Methods, Machine Learning, And Application To Exoplanets, Michael Himes

Electronic Theses and Dissertations, 2020-2023

Atmospheric retrieval is the inverse modeling method where atmospheric properties are constrained based on measured spectra. Due to the low signal-to-noise ratios of exoplanet observations, exoplanetary retrieval codes pair a radiative transfer (RT) simulator with a Bayesian statistical framework in order to characterize the distribution of atmospheric parameters that could explain the observations (the posterior distribution). This requires on the order of 106 RT model evaluations, which requires hours to days of compute time depending on model complexity. In this work, I investigate atmospheric retrieval methods and apply them to observations of hot Jupiters. Chapter 2 presents a set of …


Design And Mechanical Characterization Of Functionally Graded Sandwich Beams Fabricated Via Additive Manufacturing, Timothy Grondin Jan 2022

Design And Mechanical Characterization Of Functionally Graded Sandwich Beams Fabricated Via Additive Manufacturing, Timothy Grondin

Electronic Theses and Dissertations, 2020-2023

Lightweight aerospace structures have been sought after since humans took flight in 1903, making major strides in NASA's pursuit of the moon with the development of sandwich panel composites. Sandwich structures typically consist of two stiff phases (i.e., face sheets) separated by a lightweight phase (i.e., core), which are stacked together through adhesive layers. Such a structural arrangement provides a high stiffness-to-weight ratio and is often used in applications where weight saving is critical. Functionally Graded Materials (FGMs), refer to multifunctional materials, which contain a spatial variation of composition and/or microstructure for the specific purpose of altering thermal and structural …


Team Virtuality And Psychological Safety: An Experiment, Moses Rivera Jan 2022

Team Virtuality And Psychological Safety: An Experiment, Moses Rivera

Electronic Theses and Dissertations, 2020-2023

Working from home as part of a virtual team has become the status quo for many workers due to the COVID-19 pandemic. Moreover, modern organizations require teams skilled at complex problem-solving, innovation, and adaptability. Psychological safety enhances these skills, by means of fostering an environment in which team members can fully engage and learn. Given the theoretical possibility that team virtuality may dampen the development of team psychological safety, the present study empirically investigated relationship between these two constructs. A hypothesized model was tested, in which team virtuality has an indirect effect on team psychological safety, via intrateam perceived other-to-self …


Analytical Study Of Deep Learning Methods For Road Condition Assessment, Elham Eslami Jan 2022

Analytical Study Of Deep Learning Methods For Road Condition Assessment, Elham Eslami

Electronic Theses and Dissertations, 2020-2023

Automated pavement distress recognition is a key step in smart infrastructure assessment. Advances in deep learning and computer vision have improved the automated recognition of pavement distresses in road surface images. This task, however, remains challenging due to the high variations in road objects and pavement types, variety of lighting condition, low contrast, and background noises in pavement images. In this dissertation, we propose novel deep learning algorithms for image-based road condition assessment to tackle current challenges in detection, classification and segmentation of pavement images. Motivated by the need for classifying a wide range of objects in road monitoring, this …


Polymer Derived Ceramic For Lithium-Ion Storage, And Electrospun Polyelectrolyte Fiber For Heavy Metal Ions Removal, Zeyang Zhang Jan 2022

Polymer Derived Ceramic For Lithium-Ion Storage, And Electrospun Polyelectrolyte Fiber For Heavy Metal Ions Removal, Zeyang Zhang

Electronic Theses and Dissertations, 2020-2023

This dissertation includes two major projects. The first project investigated the great potential of polymer-derived ceramics (PDCs) as lithium-ion battery anode materials with good cycling stability and large capacity. SiCNO ceramic nanoparticles were produced by pyrolysis of polysilazane nanoparticles synthesized via an oil-in-oil emulsion crosslinking. The SiCNO nanoparticles had an average particle size of around 9 nm and contained graphitic carbon, Si3N4, and SiO2 domains. The electrochemical behavior of SiCNO nanoparticles anode was investigated to evaluate the Li-ion storage performance and understand its mechanism of Li-ion storage. The lithiation of SiCNO was observed at ~0.385 V versus Li/Li+. The anode …


Exploring The Response To Covid-19 In Puerto Rico, Richard Colon Jan 2022

Exploring The Response To Covid-19 In Puerto Rico, Richard Colon

Electronic Theses and Dissertations, 2020-2023

In recent years Puerto Rico has faced a series of unfavorable events including financial turmoil, massive population loss, earthquakes, and droughts. These events had significantly impacted its resources and capacity to confront a major public health crisis. As such, Puerto Rico was expected to poorly manage the ongoing pandemic. Despite this, nearly all data surrounding the COVID-19 pandemic in Puerto Rico has indicated the contrary. The purpose of this study was to explore and understand the COVID-19 response in Puerto Rico. The Conservation of Resources theory guided the analysis of resource consumption and management of the Puerto Rican government and …


The Breakup Of Rp-2 Liquid Fuel Droplets In A Detonation Field, Daniel Dyson Jan 2022

The Breakup Of Rp-2 Liquid Fuel Droplets In A Detonation Field, Daniel Dyson

Electronic Theses and Dissertations, 2020-2023

Experimentally obtained droplet breakup patterns are presented for RP-2 liquid fuel droplets in the environment behind a detonation wave. To the best of our knowledge, this data is the first of its kind to examine the fundamental interactions between detonation waves and an individual fuel droplet. The experiments presented here are expected to support the ongoing effort of creating accurate models of droplet breakup in a variety of environments, which in turn will lead to enhanced predictions of rotating detonation engine performance, improved safety considerations for facilities operating in hazardous conditions, and new knowledge in energetics, hypersonics, and explosion dynamics …


Broadband Investigation Of The Pyrolysis Of Propane Using A Mir Optical Parametric Oscillator, Robert Greene Jan 2022

Broadband Investigation Of The Pyrolysis Of Propane Using A Mir Optical Parametric Oscillator, Robert Greene

Electronic Theses and Dissertations, 2020-2023

The chemistry of propane continues to play a pivotal role in today's power production technologies. As reliance on natural gas expands as greener cleaner fuels are sought throughout the world, especially as countries are attempting to transition away from traditional coal and crude-oil fired plants towards solar, wind, and hydro-electric sources. Natural gas, often seen as a bridge fuel between these two competing ends, has been in the recent past and for the foreseeable future will continue to play an important role in the energy sector. Among the components of natural gas, propane plays a key role in the chemistry …


Un-Portalable! An Animated Exploration In Boundaries And Relational Design, Ira Klages Jan 2022

Un-Portalable! An Animated Exploration In Boundaries And Relational Design, Ira Klages

Electronic Theses and Dissertations, 2020-2023

Un-Portalable! is an animated multimedia short film about two friends who become fused together after using a faulty teleporter. They attempt to conceal their deformity while simultaneously navigating a social situation with one of their friends. The main focus in the film is the concept that boundaries tend to become clearer as they begin to break. This conceptual focus merges into the visual theory of the film in which highly expressive character design and hybrid media utilization are driven by relational and narrative design choices. This film serves as a condensed pilot and proof of concept for a larger prospective …


The Universal Story: Coming-Of-Age In Contemporary Animation, Christina Christie Jan 2022

The Universal Story: Coming-Of-Age In Contemporary Animation, Christina Christie

Electronic Theses and Dissertations, 2020-2023

Cycles is a 3D animated short film about a father who struggles to keep up with his daughter as she races through life. Whereas most coming-of-age films focus solely on the journey of the adolescent, Cycles subverts the expectations of the genre by exploring the impact growing up has on both the parent and child in tandem. As a film, Cycles relies on the careful and deliberate use of tropes, informed character and environment design, and established cinematic devices to support the story's theme of accepting change. Though my personal experience inspired this film, it evolved into a contemporary and …


The Loyalty Of The Lords Of Albret: An Investigation Of The Gascon Rolls At The Outset Of The Hundred Years War, Jason Delaney Jan 2022

The Loyalty Of The Lords Of Albret: An Investigation Of The Gascon Rolls At The Outset Of The Hundred Years War, Jason Delaney

Electronic Theses and Dissertations, 2020-2023

This thesis will examine the juxtaposition of the duchy of Gascony's importance to the Plantagenet Crown with the difficulties administering the region and protecting it from French interference during the late-thirteenth and early-fourteenth centuries, resulting in the necessity of securing the loyalty of Gascon nobles for assistance. The lords of Albret were powerful allies under Edward I (1272-1307), and their defection to the French under his son, Edward II (1307-1327), put Plantagenet Gascony in a vulnerable position when the Hundred Years War began in 1337. Resecuring the loyalty of Albret – and other powerful Gascon lords – was crucial for …


Creating A Reverberating Beat: Digital Curation Of The Women Writers Of The Beat Generation, Elena Maria Rogalle Jan 2022

Creating A Reverberating Beat: Digital Curation Of The Women Writers Of The Beat Generation, Elena Maria Rogalle

Electronic Theses and Dissertations, 2020-2023

The focus of my study is the creation of a special topics American literature or Women's Studies course about the women writers of the Beat Generation; this course provides students with a variety of explorations of women's writing during and after Post World War II America. This period saw many changes in terms of women's roles as they challenged the mid-20th century societal constructs. My research examines the women Beat writers by centering on their distinct women's discourse and how their voices challenged the patriarchally-driven canon of Beat Generation writers. To accomplish this task, my research focuses on expanding the …


Digital Humanities & Community College Libraries: Opportunities And Challenges, Mia Tignor Jan 2022

Digital Humanities & Community College Libraries: Opportunities And Challenges, Mia Tignor

Electronic Theses and Dissertations, 2020-2023

Digital humanities study applies technological tools to the study of humanities topics and allows for the exploration of new questions in ways that were not possible using traditional research models. Librarians have been active participants of the field since its inception, as they explore new ways to critically engage with information organization and information literacy instruction, and most research that focuses on the intersection between these fields takes place within research universities . In contrast, there is very little research examining digital humanities work at the community college, which primarily offers associate degrees, vocational certificates, and other workforce based training. …


Various Dynamical Regimes, And Transitions From Homogeneous To Inhomogeneous Steady States In Nonlinear Systems With Delays And Diverse Couplings, Ryan Roopnarain Jan 2022

Various Dynamical Regimes, And Transitions From Homogeneous To Inhomogeneous Steady States In Nonlinear Systems With Delays And Diverse Couplings, Ryan Roopnarain

Electronic Theses and Dissertations, 2020-2023

This dissertation focuses on the effects of distributed delays modeled by 'weak generic kernels' on the collective behavior of coupled nonlinear systems. These distributed delays are introduced into several well-known periodic oscillators such as coupled Landau-Stuart and Van der Pol systems, as well as coupled chaotic Van der Pol-Rayleigh and Sprott systems, for a variety of couplings including diffusive, cyclic, or dynamic ones. The resulting system is then closed via the 'linear chain trick' and the linear stability analysis of the system and conditions for Hopf bifurcations that initiate oscillations are investigated. A variety of dynamical regimes and transitions between …


Methods And Characterization Of Topological And Disordered-Induced Protection Of Coherence In Quantum Systems, Sayandip Dhara Jan 2022

Methods And Characterization Of Topological And Disordered-Induced Protection Of Coherence In Quantum Systems, Sayandip Dhara

Electronic Theses and Dissertations, 2020-2023

Quantum computers can efficiently simulate natural processes and solve certain types of mathematical problems. Two of the key issues preventing the development of platforms to realize a scalable quantum machine are the decoherence of the qubits due to the interaction with the environment and the existence of a large overhead to correct errors. Although there already exist noisy intermediate-scale quantum machines, we still need to improve much to be able to solve problems faster than the already existing classical computers. In this dissertation, we explore two approaches to tackle both issues. We propose a scheme where, using quasi-Majorana zero modes …


Analysis And Characterization Of Smokeless Powders And Smokeless Powder Residues, Emily Lennert Jan 2022

Analysis And Characterization Of Smokeless Powders And Smokeless Powder Residues, Emily Lennert

Electronic Theses and Dissertations, 2020-2023

The ability to associate a smokeless powder, smokeless powder residue, or organic gunshot residue (OGSR) to one another may be helpful in determining the origin of a suspected sample and aid in linking a suspect to a crime scene. In this study, smokeless powders were extracted and analyzed via gas chromatography – mass spectrometry (GC-MS) and direct analysis in real time – high resolution mass spectrometry (DART-HRMS). Subsequently, group definition was performed using hierarchical cluster analysis and principal component analysis followed by internally validated classification models. Then, smokeless powder residues were generated in-lab and extracted. Resulting residue data from each …


Fabrication Of Piezoelectric Field Effect Transistors For Acoustic Signal Detection, Luke Minks Jan 2022

Fabrication Of Piezoelectric Field Effect Transistors For Acoustic Signal Detection, Luke Minks

Electronic Theses and Dissertations, 2020-2023

In this study, a standard bulk FET design is fabricated with a piezoelectric gate, allowing a microwave-frequency voltage signal to be transmitted from a transducer to the transistor via acoustic conduction through the substrate. Using a single polycrystalline aluminum nitride film as the piezoelectric material, microwave-frequency piezoelectric transducers were fabricated in parallel with piezoelectric FETs. These device pairs function by generating high frequency acoustic waves in the substrate via application of AC voltage to the transducers; the transistors then recover these signals by detecting these waves in their gates via the piezoelectric film, reproducing an attenuated version of the original …


Methodology Of Augmented Reality Chinese Language Articulatory Pronunciation Practice: Game And Study Design, Daria Sinyagovskaya Jan 2022

Methodology Of Augmented Reality Chinese Language Articulatory Pronunciation Practice: Game And Study Design, Daria Sinyagovskaya

Electronic Theses and Dissertations, 2020-2023

Learning a language can be hard. Learning a language that contains tones to convey meaning is even harder. This dissertation presents a novel methodology for creating a language practice using augmented reality that has never been used before. The design of a new app in AR and non-AR versions can evaluate the same practice methodology. This methodology was applied to new software and was examined in regard to the importance of this software. Although the study results are inconclusive, progress has been made in answering research questions on the effectiveness of AR versus non-AR and the reliability of peer assessment. …


Reverse Engineering Of Adversarial Samples By Leveraging Patterns Left By The Attacker, Rahul Ambati Jan 2022

Reverse Engineering Of Adversarial Samples By Leveraging Patterns Left By The Attacker, Rahul Ambati

Electronic Theses and Dissertations, 2020-2023

Intrinsic susceptibility of deep learning to adversarial examples has led to a plethora of attack techniques with a common broad objective of fooling deep models. However, we find slight compositional differences between the algorithms achieving this objective. These differences leave traces that provide important clues for attacker profiling in real-life scenarios. Inspired by this, we introduce a novel problem of 'Reverse Engineering of aDversarial attacks' (RED). Given an adversarial example, the objective of RED is to identify the attack used to generate it. Under this perspective, we can systematically group existing attacks into different families, leading to the sub-problem of …


An Ethnographically Informed Case Study Exploring The Culture Of Writing Instruction In One Middle School English Language Arts Class, Misha Zaidi Jan 2022

An Ethnographically Informed Case Study Exploring The Culture Of Writing Instruction In One Middle School English Language Arts Class, Misha Zaidi

Electronic Theses and Dissertations, 2020-2023

This qualitative, ethnographically informed case-study examines how social, psychological, and organizational factors of a culture impact writing instruction and practice within an English Language Arts middle school class. In order to explore possible reasons for stagnant writing instruction in middle schools, two research questions guided this study: (RQ1) What do the components of writing instruction look like in one middle school class?, and (RQ2) How does one middle school ELA class exhibit identity distinction, writing development, and discourse surrounding writing instruction? I examined how one middle school class exhibits identity distinction among students and teachers within writing, development of writing, …


An Examination Of Florida's High Stakes Testing: A Post-Hoc Study Of The Academic Achievement Of Students With Borderline Intellectual Functioning, Rhonda Mcmahon Jan 2022

An Examination Of Florida's High Stakes Testing: A Post-Hoc Study Of The Academic Achievement Of Students With Borderline Intellectual Functioning, Rhonda Mcmahon

Electronic Theses and Dissertations, 2020-2023

This study compares achievement of students with borderline intellectual functioning by investigating differences in Florida Standards Assessment results for those who received special education services and those who did not receive services. A review of the literature finds research focused on this population is limited with few effective strategies identified to help these students keep pace with the increasing demand of today's classrooms. This post-hoc causal-comparative study uses an analysis of variance to determine if there are statistically significant achievement differences in Florida Standards Assessment results in English Language Arts and Mathematics for students when examining the effect of the …


Public Opinion In A Pandemic: Four Surveys Conducted With Americans Throughout The Covid-19 Pandemic, Lauri M. Baker, Chen-Xian Yang, Angela B. Lindsey, Ashley Mcleod-Morin, Ricky W. Telg, Anissa Zagonel, Sydney Honeycutt, Naik Wali, Shelli Rampold Jan 2022

Public Opinion In A Pandemic: Four Surveys Conducted With Americans Throughout The Covid-19 Pandemic, Lauri M. Baker, Chen-Xian Yang, Angela B. Lindsey, Ashley Mcleod-Morin, Ricky W. Telg, Anissa Zagonel, Sydney Honeycutt, Naik Wali, Shelli Rampold

International Crisis and Risk Communication Conference

The UF/IFAS Center for Public Issues Education in Agriculture and Natural Resources (PIE Center) conducted a series of national public opinion surveys to examine the perceptions of Americans related to COVID-19. The PIE Center conducted four surveys with ~1,500 Americans per survey from mid-March 2020 to January 2021. The surveys sought to understand Americans’ perceptions of a range of topics including health and communication concerns, vaccination perceptions and acceptance, mask understanding and willingness, and compound disasters and stress. Presentations in this panel highlight key areas of research from this survey series and share how communicators can use this research to …


The Effect Of Technological Advancements On Interactions In The Agricultural Commodities Market, Savannah B. Armas Jan 2022

The Effect Of Technological Advancements On Interactions In The Agricultural Commodities Market, Savannah B. Armas

Honors Undergraduate Theses

The objective of this research is to find, if and how, real and financial technological advancements influence interactions in the agricultural commodities market. Statistical testing was conducted to identify potential correlation and any positive linear relationships in the price data between agricultural commodities and their complementary agricultural chemical producers. Testing if higher trade volumes in this industry result from higher technology usage were initiated by identifying shared linear growth between general index volumes and agricultural commodities, alongside their chemical complement stock volumes. The scientific development of chemical engineering mirrors financial technologies influencing trader behavior as a significant contributor to agricultural …