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Articles 901 - 930 of 8047
Full-Text Articles in Entire DC Network
Efficient And Adaptive Decentralized Sparse Gaussian Process Regression For Environmental Sampling Using Autonomous Vehicles, Tanner A. Norton
Efficient And Adaptive Decentralized Sparse Gaussian Process Regression For Environmental Sampling Using Autonomous Vehicles, Tanner A. Norton
Theses and Dissertations
In this thesis, I present a decentralized sparse Gaussian process regression (DSGPR) model with event-triggered, adaptive inducing points. This DSGPR model brings the advantages of sparse Gaussian process regression to a decentralized implementation. Being decentralized and sparse provides advantages that are ideal for multi-agent systems (MASs) performing environmental modeling. In this case, MASs need to model large amounts of information while having potential intermittent communication connections. Additionally, the model needs to correctly perform uncertainty propagation between autonomous agents and ensure high accuracy on the prediction. For the model to meet these requirements, a bounded and efficient real-time sparse Gaussian process …
Understanding College Students' Use Of Written Feedback In Mathematics, Erin Loraine Carroll
Understanding College Students' Use Of Written Feedback In Mathematics, Erin Loraine Carroll
Theses and Dissertations
Many teachers want to help their students develop a growth mindset about their ability to do mathematics. Research has shown, however, that teachers simply do not know how to promote growth mindsets in their classrooms. Existing research suggests that one way teachers can support students' development of a growth mindset is through the written feedback they provide students. This study combines the research done on students' mindsets and written feedback to examine the interaction between student mindset and written feedback by analyzing written feedback provided to students in a College Algebra class and how students used that feedback based on …
The Influence Of Sex On Cognitive Control Performance And Frontoparietal Network Integrity In First Episode Psychosis, Kaitlyn Mcfarlane Greer
The Influence Of Sex On Cognitive Control Performance And Frontoparietal Network Integrity In First Episode Psychosis, Kaitlyn Mcfarlane Greer
Theses and Dissertations
Cognitive deficits in first-episode psychosis (FEP) are well documented including deficits in cognitive control, but how sex may influence or impact these cognitive deficits is not well known. Cognitive deficits may impact multiple neural networks, including the fronto-parietal network (FPN). How sex may influence the structural integrity of regions in the FPN is also an important area of research in FEP that may provide further insight into the beginnings of the disease. The current study aimed to examine sexual dimorphisms in structural integrity of the frontoparietal network (FPN) and its role in cognitive control in FEP. A total of 111 …
Investigation Of Material, Process, And Environmental Factors In Bubble Defect Formation For Labels Of Bottled Essential Oils, Joseph Lloyd Andrus
Investigation Of Material, Process, And Environmental Factors In Bubble Defect Formation For Labels Of Bottled Essential Oils, Joseph Lloyd Andrus
Theses and Dissertations
Labeling of consumer products is not only required by regulatory bodies for product identification, but it also serves as a symbol of product quality and prestige. Bubbles under the label are unsightly and impact customer satisfaction. Pressure Sensitive Adhesive (PSA) labels currently make up more than eighty percent of all labels in the market today, yet little research could be found addressing causes of bubbling in an industrial setting. A root cause analysis for bubble development included four aspects: label application, environmental conditions of shipping and storage, defects in glass bottle geometry, and oil contamination. The most significant findings from …
International Water Quality: Global Patterns Of Water Pollutants And Pathogens, Leslie Lange
International Water Quality: Global Patterns Of Water Pollutants And Pathogens, Leslie Lange
Theses and Dissertations
Water quality is an essential component of vibrant societies and ecosystems. For decades, researchers, managers, and policymakers around the world have struggled to accelerate societal progress while preserving and enhancing water quality and human health. This thesis consists of two studies that I hope will contribute to better understanding, policy, and management. In the first study, I evaluated spatial and temporal patterns in global water quality and their relationship to gross domestic product (GDP) per capita, as a metric of socioeconomic development status. Using global water quality datasets containing over 2.7 million observations, I tested the Environmental Kuznet Curve (EKC) …
Patterned And Infiltrated Vertically Aligned Carbon Nanotube Ultra-Black Materials, Kevin Laughlin
Patterned And Infiltrated Vertically Aligned Carbon Nanotube Ultra-Black Materials, Kevin Laughlin
Theses and Dissertations
Ultra-black materials reflect less than 1% of incident light, and are used in a wide variety of applications from low signal detector systems, to jewelry. The darkest ultra-black materials are made with vertically aligned carbon nanotubes (VACNTs). One downside to these VACNT based ultra-black material, is they are extremely fragile, and the types of surfaces they can be grown on is limited. Here I created a strengthened ultra-black material that can withstand light handling and drying from water exposure, and can be transferred to other substrates while remaining ultra-black. I also present theoretical models with supporting data on how to …
Anxiety Of Struggling Readers And Excelling Readers During The Covid-19 Pandemic, Chelsey Taylor Lemmon
Anxiety Of Struggling Readers And Excelling Readers During The Covid-19 Pandemic, Chelsey Taylor Lemmon
Theses and Dissertations
Anxiety is the most reported negative emotion in the academic setting. One of the specific forms of anxiety that children can experience is reading anxiety (RA). Children who experience RA are often at risk for reading failure; likewise, children who experience reading failure are likely to experience RA. Children who excel at reading can also experience anxiety, often in the form of harm avoidance. Bibliotherapy has been shown to help to mitigate the effects of specific types of anxiety in children. The purpose of this study was to understand the anxiety of children who excel at reading and children at …
Teachers' Values For The Reduction Of Teacher Attrition In Utah Public Schools, Forrest Jensen
Teachers' Values For The Reduction Of Teacher Attrition In Utah Public Schools, Forrest Jensen
Theses and Dissertations
Teacher attrition is a major concern of educational systems. Research has investigated causes of attrition but have primarily neglected the role of teachers' values. The aim of this study is to explore how teachers prioritize four different factors: salary, administrative support, medical benefits, and teaching difficulty. Teachers (448) responded to a survey that asked them to (a) order the four factors by importance, (b) decide between job offers that differed with regards to these factors (e.g., a job with better salary or better administrative support), and (c) report information about teachers' characteristics. Data analysis involved exploring how teachers with differing …
Reformulated Vortex Particle Method And Meshless Large Eddy Simulation Of Multirotor Aircraft, Eduardo J. Alvarez
Reformulated Vortex Particle Method And Meshless Large Eddy Simulation Of Multirotor Aircraft, Eduardo J. Alvarez
Theses and Dissertations
The vortex particle method (VPM) is a mesh-free approach to computational fluid dynamics (CFD) solving the Navier-Stokes equations in their velocity-vorticity form. The VPM uses a Lagrangian scheme, which not only avoids the hurdles of mesh generation, but it also conserves vortical structures over long distances with minimal numerical dissipation while being orders of magnitude faster than conventional mesh-based CFD. However, VPM is known to be numerically unstable when vortical structures break down close to the turbulent regime. In this study, we reformulate the VPM as a large eddy simulation (LES) in a scheme that is numerically stable, without increasing …
Quantum Decoherence In Time-Dependent Anharmonic Systems, Ty Beus
Quantum Decoherence In Time-Dependent Anharmonic Systems, Ty Beus
Theses and Dissertations
This dissertation studies quantum decoherence in anharmonic oscillator systems to monitor and understand the way the systems evolve. It also explores methods to control the systems' evolution, and the effects of decoherence when applicable. We primarily do this by finding the time evolution of the systems using their Lie algebraic structures. We solve for a generalized Caldirola-Kanai Hamiltonian, and propose a general way to produce a desired evolution of the system. We apply the analysis to the effects of Dirac delta fluctuations in mass and frequency, both separately and simultaneously. We also numerically demonstrate control of the generalized Caldirola-Kanai system …
Towards Color-Based Two-Hand 3d Global Pose Estimation, Fanqing Lin
Towards Color-Based Two-Hand 3d Global Pose Estimation, Fanqing Lin
Theses and Dissertations
Pose estimation and tracking is essential for applications involving human controls. Specifically, as the primary operating tool for human activities, hand pose estimation plays a significant role in applications such as hand tracking, gesture recognition, human-computer interaction and VR/AR. As the field develops, there has been a trend to utilize deep learning to estimate the 2D/3D hand poses using color-based information without depth data. Within the depth-based as well as color-based approaches, the research community has primarily focused on single-hand scenarios in a localized/normalized coordinate system. Due to the fact that both hands are utilized in most applications, we propose …
Methods For Characterizing Groundwater Resources With Sparse In-Situ Data, Ren Nishimura
Methods For Characterizing Groundwater Resources With Sparse In-Situ Data, Ren Nishimura
Theses and Dissertations
Groundwater water resources must be accurately characterized in order to be managed sustainably. Due to the cost to install monitoring wells and challenges in collecting and managing in-situ data, groundwater data is sparse in space and time especially in developing countries. In this study we analyzed long-term groundwater storage changes with limited times-series data where each well had only one groundwater measurement in time. We developed methods to synthetically create times-series groundwater table elevation (WTE) by clustering wells with uniform grid and k-means-constrained clustering and creating pseudo wells. Pseudo wells with the WTE values from the cluster-member wells were temporally …
An Exploratory Study Of Behavioral Engagement In People With And Without Aphasia: Comparisons And Relationships, Vivian Elisabeth Ward
An Exploratory Study Of Behavioral Engagement In People With And Without Aphasia: Comparisons And Relationships, Vivian Elisabeth Ward
Theses and Dissertations
Previous research suggests that attentional deficits could be the underlying cause of language impairments in people with aphasia (PWA) and that behavioral engagement ratings can be an accurate way to measure attention to specific tasks. Previous research also suggests that PWA have lower levels of behavioral engagement than neurologically healthy adults. Participants in the present study included 9 PWA and 18 neurologically healthy adults. This was an exploratory study investigating the relationships and differences between behavioral engagement and physiological measures, perceived arousal, and naming accuracy and response time in PWA and neurologically healthy adults. Participants completed a confrontational naming task …
The Behavioral And Neurophysiologic Relationships Between Sensory Processing And Autistic Traits In Emerging Adults, Savanah Calton
The Behavioral And Neurophysiologic Relationships Between Sensory Processing And Autistic Traits In Emerging Adults, Savanah Calton
Theses and Dissertations
The majority of individuals diagnosed with Autism Spectrum Disorder (ASD) experience sensory processing difficulties that are also associated with greater presence of autistic traits, psychiatric difficulty, and intolerance of uncertainty (IU). These relationships are also expressed in the neurotypical (NT) population, termed the Broader Autism Phenotype (BAP), and present with impacts to daily functioning/well-being just as prominently. However, little is known concerning the neurophysiologic nature of these behavioral relationships, especially in young adults. Thus, the purpose of the current study was to examine the behavioral and neurophysiologic nature of the relationships between sensory processing, autistic traits, and related behavioral functions …
Two New Late Quaternary Avifaunas From The East-Central Great Basin With The Description Of A New Species Of Falco, Steven D. Emslie, Jim I. Mead
Two New Late Quaternary Avifaunas From The East-Central Great Basin With The Description Of A New Species Of Falco, Steven D. Emslie, Jim I. Mead
Western North American Naturalist
We report 2 new late Quaternary avifaunas from cave deposits in Snake Valley, White Pine County, eastern Nevada, that provide new records of extinct and extant species in the east-central Great Basin. These avifaunas collectively represent at least 24 species, including the most northern inland record of California Condor (Gymnogyps californianus) in western North America and a new species of kestrel (Falco sp.) described herein. Two extralimital living species also were identified—the Harlequin Duck (Histrionicus histrionicus) and Snowy Owl (Bubo scandiacus)—and are the first fossil records of these species in the Great Basin. …
Synthesis And Applications Of Α,Β-Dehydroamino Acid-Containing Peptides, Diego A. Moya
Synthesis And Applications Of Α,Β-Dehydroamino Acid-Containing Peptides, Diego A. Moya
Theses and Dissertations
Yaku’amide A (YA) is a linear anticancer peptide that is rich in bulky dehydroamino acids (ΔAAs) and β-hydroxyamino acids (β-OHAAs). In our recent total synthesis of YA, we featured a one-pot anti dehydration–azide reduction–O→N acyl transfer process for the stereospecific construction of Z- and E- ∆Ile residues. Despite previous total syntheses and our efforts, the synthesis of YA remains lengthy. Via computational studies, we identified two analogue peptides that closely resemble the conformation of YA. The use of simpler and symmetrical bulky ΔAAs such as dehydrovaline (ΔVal) and dehydroethylnorvaline (ΔEnv) as surrogates of ∆Ile, along with azlactone chemistry for their …
Progress On Static Structures In Leaky Mode Waveguides, Manusha Korimi
Progress On Static Structures In Leaky Mode Waveguides, Manusha Korimi
Theses and Dissertations
Virtual reality (VR) head-mounted displays provide a high definition, immersive experi-ence to the viewer. However, most existing technologies have flaws like bulky design and vergence-accommodation conflict that may cause stress in the neck muscles, posture issues, nausea, motion sickness and dizziness. Similarly, augmented reality (AR) displays, which use transparent light modulators, exist, but they possess low field of view and a limited number of discrete depth planes when wide field of view and continuous depth would be ideal. The ultimate goal of my research is use leaky mode waveguide devices to create wide-view angle, transparent near eye holographic displays for …
The Regulation Of Atg9a-Mediated Aggrephagy By An Ulk1-Independent Atg13-Atg101 Complex, Joshua Youngs
The Regulation Of Atg9a-Mediated Aggrephagy By An Ulk1-Independent Atg13-Atg101 Complex, Joshua Youngs
Undergraduate Honors Theses
Aggrephagy, a type of autophagy, is an essential cellular process by which protein aggregates are collected and broken down in the lysosome. Protein aggregates are implicated in several diseases including Alzheimer’s disease, diabetes, and cancer. Here, we investigate the ATG13-ATG101 protein complex, a sub-complex of the canonical ULK1 complex whose regulatory role in aggrephagy is not completely understood. We also develop a protein fragment complementation (PFC) assay using the biotin ligase TurboID to study the functions of the ATG13-ATG101 complex with increased specificity. We demonstrate that ATG13 is required for optimal degradation of p62-ubiquitin condensates. We also show that a …
Finding Patterns In The Inertia Of The Distance Squared Matrix Of Unicyclic Graphs, Kellon Sandall, Mark Kempton, Christian Howell
Finding Patterns In The Inertia Of The Distance Squared Matrix Of Unicyclic Graphs, Kellon Sandall, Mark Kempton, Christian Howell
Undergraduate Honors Theses
We analyze the spectrum of the distance squared matrix of a tree and give a relation between the inertia of the distance squared matrix and the structure of the tree. We take the result one step further and consider the addition of exactly one cycle in the tree. We obtain an expression for the inertia of the distance squared matrix of a cycle graph. We obtain a bound on the inertia of the distance squared matrix of an arbitrary unicyclic graph.
Synthesis Of Yaku’Amide A Analogues And Impact Of Dehydroamino Acids On The Structure And Stability Of Incipient 310 Helical Peptides, Daniel Joaquin
Synthesis Of Yaku’Amide A Analogues And Impact Of Dehydroamino Acids On The Structure And Stability Of Incipient 310 Helical Peptides, Daniel Joaquin
Theses and Dissertations
The first project in this dissertation describes the total synthesis of yaku’amide A analogues. Natural product yaku’amide A possesses potent anticancer activity and exhibits a novel mode of action. However, due to its complex asymmetrical isoleucine dehydroamino acids, the synthesis of this polypeptide poses a unique challenge. Despite the efficient synthesis developed in our lab, the total synthesis of this natural product remains lengthy. In order to simplify the overall synthesis, symmetrical dehydroamino acids were incorporated to replace the dehydroisoleucine residues yielding two analogues of yaku’amide A that closely resembles the conformation of the natural product. Biological testing of the …
Gas Phase Techniques For The Study Of Biomolecular And Supramolecular Structures And Chemistry, Andrew J. Arslanian
Gas Phase Techniques For The Study Of Biomolecular And Supramolecular Structures And Chemistry, Andrew J. Arslanian
Theses and Dissertations
This dissertation expounds on the investigations of the structure and chemistry of peptides and supramolecular host-guest systems in the gas phase. These investigations used two different kinds of analytical instrument: Fourier transform ion cyclotron resonance mass spectrometry (FTICR-MS) and ion mobility mass spectrometry (IM-MS, IMS). These investigations were complemented by chemical modeling. The FTICR was used to radially trap ions with its 4.7 T magnet, which allowed the ions to undergo sustained off-resonance irradiation collision-induced dissociation (SORI-CID). A subsequent event then measured the collision cross sections (σ) of the targeted precursor ion and one of the selected product ions. These …
Effects Of An External Oscillation Device On Phonation Threshold Pressure (Ptp), Brittany Tiffany Jones
Effects Of An External Oscillation Device On Phonation Threshold Pressure (Ptp), Brittany Tiffany Jones
Theses and Dissertations
The purpose of the present study was to examine the effects of external laryngeal vibration on voice function. The current study was based on a recent pilot study using silicone vocal folds that demonstrated a decrease in phonation threshold pressure (PTP; cmH2O) when an external oscillation was applied to the vocal folds. Using a within-subjects experimental design, a custom external oscillatory device was fitted to the posterior portion of 12 excised pig larynges using a traditional benchtop phonation setup. For each larynx, phonation was elicited during 30 repeated trials, including 15 with and 15 without external oscillation. During the phonation …
District Leaders' Perception Of Multi-Tiered System Of Supports Implementation: A Qualitative Study, Julia E. Facer
District Leaders' Perception Of Multi-Tiered System Of Supports Implementation: A Qualitative Study, Julia E. Facer
Theses and Dissertations
Multi-Tiered System of Supports (MTSS) is a model that can be implemented in school buildings with the support of school district leaders. However, the voices of district leaders involved in MTSS implementation are limited in the research. This study sought to investigate what district leaders perceived as impacting factors towards MTSS implementation and draw conclusions about impacting factors from their opinions. Ten district leaders in a mountain west state of the United States were interviewed via Zoom and had their transcripts analyzed for impacting factors using a form of thematic analysis. All participants were involved with MTSS at their district …
Understanding Microstructure Heterogeneity In Li-Ion Battery Electrodes Through Localized Measurement Of Ionic Transport, Baichuan Liu
Understanding Microstructure Heterogeneity In Li-Ion Battery Electrodes Through Localized Measurement Of Ionic Transport, Baichuan Liu
Theses and Dissertations
Electrode microstructure influences ionic transport and electronic transport and is a key factor that affects lithium-ion battery performance. Non-uniform microstructure or heterogeneity in battery electrodes has long been observed and leads to non-uniform transport properties. This work provides a better understanding of in-plane heterogeneity at millimeter length scale and through-plane heterogeneity at micrometer length scale, through a combination of experiment and modeling. The first part of this work develops the aperture probe technique, which is an experimental method and associated model to locally estimate ionic transport, represented by MacMullin number, in the electrode. By generating contour maps of MacMullin number, …
Modeling Inter-Particle Magnetic Correlations In Magnetite Nanoparticle Assemblies Using X-Ray Magnetic Scattering Data, Johnathon Michael Rackham
Modeling Inter-Particle Magnetic Correlations In Magnetite Nanoparticle Assemblies Using X-Ray Magnetic Scattering Data, Johnathon Michael Rackham
Theses and Dissertations
Magnetic nanoparticles are used in nanotechnologies and biomedical applications, such as drug targeting, hyperthermia, MRI contrasting agents, and bio-separation of compound solutions. Magnetite (Fe3O4) nanoparticles stand to be effective in these roles due to the non-toxic nature of magnetite and its ease of manufacture. To this end, a greater understanding of the magnetic behavior of the individual magnetite nanoparticles is needed when a collection of them is used. This research seeks to discover the local magnetic ordering of ensembles of magnetite nanoparticles at various stages of the magnetization process, temperatures above and below their blocking temperature, and for various particle …
Development Of Cooperative Catalytic Systems And Bimetallic Catalysts For Organic Synthesis, Kelton Guy Forson
Development Of Cooperative Catalytic Systems And Bimetallic Catalysts For Organic Synthesis, Kelton Guy Forson
Theses and Dissertations
The development of new catalysts for organic synthesis is an important pursuit that enables the discovery of new and more efficient reactions and the identification of new reaction mechanisms. Cooperative catalytic systems and bimetallic catalysts represent unique approaches to catalyst development that achieve reactivity that cannot be obtained with a single catalyst or metal. These types of catalysts can activate substrates in unique ways, facilitate reactions under mild conditions, increase substrate scope, and provide access to completely new transformations. The first part of this work describes the development of a cooperative nickel-titanium-catalyzed amination of allylic alcohols. The cooperative effects of …
The Default Network And Autism Spectrum Disorder: Characterizing Sub-Networks And Behavioral Correlates, Alyssa K. Kozlowski
The Default Network And Autism Spectrum Disorder: Characterizing Sub-Networks And Behavioral Correlates, Alyssa K. Kozlowski
Theses and Dissertations
The default network (DN), and specifically its sub-networks default network A (DN A) and default network B (DN B), has been strongly implicated in social cognition. This study examined its role in predicting social behavior, and also differences that may exist across diagnostic groups that may explain discrepancies in social cognition and behavior. One of the popular methods of study is functional connectivity, or analyzing correlated activity in the brain. Autism Spectrum Disorder (ASD) is a disorder characterized by social impairment and abnormal social behavior. To date, much of the functional connectivity research in ASD has focused on global connectivity, …
A Direct-Read, A Posteriori Golden Copy Method For Measuring Soc Cache Upsets, Evan D. Poff
A Direct-Read, A Posteriori Golden Copy Method For Measuring Soc Cache Upsets, Evan D. Poff
Theses and Dissertations
A method for measuring system-on-a-chip (SoC) cache upsets is presented and evaluated. In contrast to methods that predict cache contents through analysis or memory access patterns, this method uses system registers to read cache memories directly, thereby creating and checking golden copies to detect individual memory upsets during operation. The test method is driven by the device under test itself and does not require a user to set or know a priori the cache contents. A bare-metal implementation of this “direct golden method” on a Zynq UltraScale+ MPSoC logged upsets in the device’s data cache, data tag, and TLB RAM …
Computational Methods To Simulate Molten Salt Thermophysical Properties, Talmage Porter, Michael M. Vaka, Parker Steenblik, Dennis Della Corte
Computational Methods To Simulate Molten Salt Thermophysical Properties, Talmage Porter, Michael M. Vaka, Parker Steenblik, Dennis Della Corte
Faculty Publications
Molten salts are important thermal conductors used in molten salt reactors and solar applications. To use molten salts safely, accurate knowledge of their thermophysical properties is necessary. However, it is experimentally challenging to measure these properties and a comprehensive evaluation of the full chemical space is unfeasible. Computational methods provide an alternative route to access these properties. Here, we summarize the developments in methods over the last 70 years and cluster them into three relevant eras. We review the main advances and limitations of each era and conclude with an optimistic perspective for the next decade, which will likely be …
In Their Own Words: Perspectives On Collection Weeding From Library Employees And Teaching Faculty, Dan Broadbent, Megan Frost, Gregory M. Nelson, David Pixton
In Their Own Words: Perspectives On Collection Weeding From Library Employees And Teaching Faculty, Dan Broadbent, Megan Frost, Gregory M. Nelson, David Pixton
Faculty Publications
Following a Science and Engineering collection weeding project of over 350,000 print items, our research team conducted interviews with 20 library employees and 19 teaching faculty involved in the project. The purpose of the interviews was to assess the interviewees’ perspectives and feelings relating to the time required to complete the project, inter- and intra- library communication, the decision-making processes, and their personal assessment of the costs and benefits of the project. The interviewees also offered their views of the overall project’s successes and areas for improvement. Drawing from a qualitative analysis of the interviews, we provide guidance for other …