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Articles 1621 - 1650 of 29589
Full-Text Articles in Entire DC Network
Implicit Vs. Explicit Approaches When Teaching Reflexive Structures In A Fifth-Grade Spanish Dual Immersion Classroom, Paula Valeria Ward
Implicit Vs. Explicit Approaches When Teaching Reflexive Structures In A Fifth-Grade Spanish Dual Immersion Classroom, Paula Valeria Ward
Theses and Dissertations
Dual language immersion (DLI) students can develop high levels of proficiency in their second language at a young age. However, they often have difficulties with their accuracy using advanced grammatical constructions (Watzinger-Tharp et al., 2018), such as using different verbs tenses or gender and number agreement in speaking and writing (Bateman et al., 2020). The goal of this study is to test whether explicit or implicit instructional approaches are more effective in the teaching of one such grammatical concept, specifically reflexive constructions, in two DLI classrooms. In this research, I investigated results from a five-lesson treatment in a case study …
Reconstructing Visual Narratives: Mary Colter, Fred Kabotie, And The Myth Of The West At Desert View Watchtower, Allison M. Foster
Reconstructing Visual Narratives: Mary Colter, Fred Kabotie, And The Myth Of The West At Desert View Watchtower, Allison M. Foster
Theses and Dissertations
Desert View Watchtower opened in 1933 on the Grand Canyon South Rim, under the management of the Fred Harvey Company. The structure contains many self-contradictions, in terms of style and use. In this thesis, I argue that these contradictions come from the dichotomous motives of Desert View Watchtower's architect, Mary Colter, and her employers, the Fred Harvey Company and the Atchison, Topeka & Santa Fe Railway. New western history theory of the Mythical West is used to explain Harvey/Santa Fe marketing, which created a narrative suggesting that Native American lifeways were going to disappear from the Southwest. I argue that …
One-Dimensional Cores Of Peano Continua, Shogo Starr
One-Dimensional Cores Of Peano Continua, Shogo Starr
Theses and Dissertations
In this paper, we define a berbering of a Peano continuum, which is the space one gets by attaching a null sequence of circles to a countable dense subset of a Peano continuum. The topology of a berbering is one that recognizes which circles are small, in the sense that any neighborhood of the original Peano continuum will entirely contain all but finitely many of the attached circles. We then show that given a berbering of any simply connected, locally simply connected Peano continuum $Y$, there exists a one-dimensional Peano continuum $X$ and a map from $X$ to the berbering …
Optimal Limb Regeneration Strategies In Hemigrapsus Sanguineus, Laura S. Fletcher
Optimal Limb Regeneration Strategies In Hemigrapsus Sanguineus, Laura S. Fletcher
Theses and Dissertations
Diet quality and energy allocation influence an individual’s life-history traits by determining how much energy is available for processes such as growth and reproduction. One common method of assessing diet quality involves measuring gut length or size, which is typically inversely related to diet quality. However, this often requires animal sacrifice and time- consuming dissections. Similarly, many traditional bioenergetics models fail to capture the context-dependence of energy allocation, as these models rely on fixed energy allocation rules. One such rule is the κ-rule of dynamic energy budget theory, which assumes a fixed proportion (κ) of assimilated energy is always allocated …
Feature Engineering For Grain Boundaries And Other Variable-Sized Atom Clusters, C. Braxton Owens
Feature Engineering For Grain Boundaries And Other Variable-Sized Atom Clusters, C. Braxton Owens
Theses and Dissertations
Obtaining microscopic structure-property relationships for grain boundaries are challenging because of the complex atomic structures that underlie their behavior. This has led to recent efforts to obtain these relationships with machine learning, but representing a grain boundary structure in a manner suitable for machine learning is not a trivial task. There are three key steps common to property prediction in grain boundaries and other variable-sized atom clustered structures. These are: (1) describe the atomic structure as a feature matrix, (2) transform the variable-sized feature matrices of different structures to a fixed length common to all structures, and (3) apply machine …
Wind-Carved Wonders: An Aerial Study Of Yardangs In The Puna, Argentina Using Drone And Satellite Imagery, Derek Gordon Ashliman
Wind-Carved Wonders: An Aerial Study Of Yardangs In The Puna, Argentina Using Drone And Satellite Imagery, Derek Gordon Ashliman
Theses and Dissertations
Yardangs, elongated landforms sculpted by wind erosion, are prominent features in the Campo de Piedra Pomez (CPP) region of the Puna-Altiplano Plateau, Argentina. This study explores their formation and evolution through the examination of a 6 km by 0.5 km area captured in 2019 and a 5 km by 0.5 km area in 2024. High-resolution drone imagery and satellite data were employed to classify and quantify yardangs, gravel, and underlying bedrock across a vast study area. The research reveals a variation in yardang distribution and morphology from northwest (windward) to southeast (leeward), noting a significant decrease in yardang and bedrock …
Fission Product Thermodynamics, Solubility, And Extraction In Molten Salts And Lead, Richard Lee Fitzhugh
Fission Product Thermodynamics, Solubility, And Extraction In Molten Salts And Lead, Richard Lee Fitzhugh
Theses and Dissertations
Chemical behavior of fission products in systems relevant to two major advanced nuclear reactor systems, namely the lead-cooled fast reactor (LFR) and molten-salt reactor (MSR), has been studied with a heavy emphasis on thermodynamics. The behavior of fission products in molten salts is examined from a theoretical perspective, with an emphasis on the standard state used to define the thermodynamic activity. A standard state extrapolated from infinite dilution behavior, which is fairly common practice in electrochemistry, is found to facilitate faster, easier, and simpler analysis while retaining much of the accuracy of the complex Modified Quasichemical Model. Inductively-coupled plasma mass …
Dynamics Of Dissolved And Particulate Trace Metals In A Snowmelt-Dominated Stream, Provo River, Utah, Usa, Kendra Louise Caskey
Dynamics Of Dissolved And Particulate Trace Metals In A Snowmelt-Dominated Stream, Provo River, Utah, Usa, Kendra Louise Caskey
Theses and Dissertations
Trace element concentrations vary substantially during snowmelt runoff, with changes in the dissolved versus particulate fractions potentially impacting their movement at the catchment scale. To investigate trace element behavior in a snowmelt dominated stream, we measured concentrations in different size fractions in the Provo River (northern Utah, USA). We sampled the river at three locations during water years 2016-2018 and 2021-2023 for trace metal and major ion concentrations. During the final year, we collected three fractions (unfiltered, <0.45 µm filtered, and <0.22 µm filtered) for trace metal chemistry and calculated the particulate concentration as the difference between the unfiltered and 0.45 µm fraction. Stream measurements included pH, discharge, turbidity, and fluorescent dissolved organic matter (fDOM). We also sampled water sources (soil water, ephemeral streams, and snowpack) to compare trace metal concentrations across the watershed with the stream. Trace metal (Al, Be, Fe, Pb) and rare earth element (REE +Y) concentrations had the highest particulate and dissolved concentrations during snowmelt runoff. In contrast, major cations were primarily found in the dissolved fraction with lowest concentrations during snowmelt runoff. Major cation and particulate metal concentrations increased from upstream to downstream. The increased trace metal and REE + Y concentrations during snowmelt relative to baseflow may be explained by increased discharge and associated increased turbidity and fDOM. A comparison with water sources suggests that dissolved and particulate trace metals in the stream are sourced from flushed soil water, as trace metal transport through the watershed is facilitated by suspended sediment and dissolved organic matter. For most of the trace metals and REE +Y, concentrations were similar in the <0.45 µm and <0.22 µm fractions. Yet Al tended to have higher concentrations in the <0.45 µm fraction, suggesting a colloidal form of Al between 0.22 µm and 0.45 µm may exist. Differences from upstream to downstream may be related to changes in pH, from ~7 at the upper site to ~8 at the lower sites, which would change sorption capacity, saturation indices, or speciation. Our study demonstrates that trace metal concentrations are variable during snowmelt as the metals interact with suspended particles or dissolved organic matter and are influenced by changing water chemistry, with implications for understanding water quality impairments in snowmelt-dominated streams.
Void Formation During Liquid Composite Molding Under Varied Pressure With Mechanical Properties Validation, Neil Russell Thompson
Void Formation During Liquid Composite Molding Under Varied Pressure With Mechanical Properties Validation, Neil Russell Thompson
Theses and Dissertations
Composite materials have revolutionized products and how they are manufactured. Most large-scale aerospace companies utilize a carbon fiber pre-impregnated with a resin in conjunction with an autoclave to minimize voids, but it is very expensive and requires a great amount of space. The less expensive alternative to prepreg-autoclave processes is known as Liquid Composite Molding (LCM), in which the resin is brought into a mold via overpressure on the resin supply or by a vacuum in the mold. But this process is more prone to voids due to bubble formation. Voids are a critical issue as common failure modes such …
Linguistic Perspectives In Ecuadorian Amazonian Kichwa, Max Nathan Jensen
Linguistic Perspectives In Ecuadorian Amazonian Kichwa, Max Nathan Jensen
Theses and Dissertations
Despite the fact that Amazonian Kichwa speakers consider themselves to be both linguistically and culturally distinct from their highland counterparts (Ennis 2020; Wroblewski 2012), relatively little has been done to document their language attitudes and how these attitudes are reflected in their speech. This study shows this to be a valid line of questioning. Using commentary from interviews with Amazonian Kichwa people, I show that views on the status and future of the language are divided, as well as perspectives on the role of non-Kichwa sources like schools and governments in language maintenance. Older and native speakers of Kichwa are …
Deep Learning For Source Localization In A Laboratory Tank, Corey Emerson Dobbs
Deep Learning For Source Localization In A Laboratory Tank, Corey Emerson Dobbs
Theses and Dissertations
Deep learning has been applied to underwater acoustics problems in many forms. One difficulty in applying deep learning techniques to ocean acoustics is the spatially and temporally varying environmental properties. Another challenge is the lack of labeled data for training large networks. The overall goal of this work is to develop deep learning approaches for source localization that can be adaptable to different conditions. In this work, a convolutional neural network was trained on acoustic data measured in a water tank, while the water was at room temperature, to predict source-receiver range. Tests were done to ascertain ideal quantities of …
An Investigation Of University General Education Assessment Practice, Joseph H. Hanks
An Investigation Of University General Education Assessment Practice, Joseph H. Hanks
Theses and Dissertations
Many-facets Rasch modeling (MFRM) is an effective way to compensate for rater effects (e.g., rater leniency/severity) in the ratings assigned during rater-mediated assessment. While a fully crossed MFRM rating design, in which all raters rate every rating object, is the ideal from a psychometric standpoint; fully crossed designs are rarely implemented in practice because of the resource burden they impose on assessment personnel. Thus, incomplete rating designs, where each rater does not rate all rating objects, are the norm. However, unless assessment personnel consciously attend to a variety of aspects of rating design, incomplete rating designs may suffer from design …
Emergent Leadership, L2 Oral Proficiency, And Social Networks During Study Abroad, Nicole C. Whitby
Emergent Leadership, L2 Oral Proficiency, And Social Networks During Study Abroad, Nicole C. Whitby
Theses and Dissertations
Research shows that study abroad (SA) provides a unique, yet varied outcome for students seeking to improve their target language oral proficiency during study abroad SA (Freed et al., 2004). Contemporary work in second language acquisition (SLA) during SA has looked beyond individual behaviors of sojourners to analyze social networks as a structure with significant influence on outcomes, yet emergent leadership has not been addressed within social network analysis in SA. To address this gap the current study employed a computational social network approach. This mixed methods study analyzes the social networks of 30 SA sojourners from a large private …
Linking Geospatial Trends And Geochemical Fingerprints To Anthropogenic Phosphorus Dust Deposition In Subalpine Soils, Austen Michael Lambert
Linking Geospatial Trends And Geochemical Fingerprints To Anthropogenic Phosphorus Dust Deposition In Subalpine Soils, Austen Michael Lambert
Theses and Dissertations
This study shows that fugitive emissions associated with the surface mining of phosphate rock are a significant phosphorus (P) source to surface soils in northeastern Utah. Phosphorus is a nonrenewable resource essential for all life. Anthropogenic alterations to the P-cycle have led to widespread P pollution, and the unsustainable management of P has led to the threat of global depletion of P resources. Thus, accounting for both natural and anthropogenic flow paths of P is essential for the conservation and pollution reduction of P. One such source of human alteration to the P-cycle is the mining of phosphate rock. Mining, …
Microbial Hydrolysis Process To Improve Anaerobic Digestion For Biofuel Generation, Caleb Michael Jensen
Microbial Hydrolysis Process To Improve Anaerobic Digestion For Biofuel Generation, Caleb Michael Jensen
Theses and Dissertations
Human development results in billions of tons of waste per year, which contributes to major issues such as pollution, climate change, and habitat destruction. In this study, we explored the impact of bacterial inoculation on volatile fatty acid (VFA) production, volatile solids (VS), and gas output in anaerobic digesters under different substrate treatments. Our results reveal that bacterial inoculation significantly boosts VFA levels, especially acetic acid, with both Caldicellulosiruptor bescii and mixed Caldicellulosiruptor, cultures showing notable differences compared to controls, especially in untreated manure and WAS treatments. Acetic acid and VS/TS increased in untreated WAS when inoculated with C. bescii …
The Cofactor Matrix For Optimized Normal Transformations & Real-Time Caustics And Refractions Using Signed Distance Fields, Dane William Christensen
The Cofactor Matrix For Optimized Normal Transformations & Real-Time Caustics And Refractions Using Signed Distance Fields, Dane William Christensen
Theses and Dissertations
This thesis contains two distinct manuscripts both focused on real-time rendering research; an abstract for each is provided: 1. We survey methods for mapping normal vectors to a transformed surface with emphasis on the cofactor matrix form. We demonstrate that the cofactor matrix uniquely and correctly supports matrix transformations that are rank deficient or have negative determinants, while also generalizing to operations such as rotation, scaling, translation, and shearing. We derive and demonstrate the completeness of this new convention in contrast to other approaches, while also establishing its computational efficiency benefits. 2. We present SDF volumes as an efficient datastructure …
Quiescent Condensation Heat Transfer On Vertical Cicnt Structured Superhydrophobic Surfaces, Clint Mach Hubbard
Quiescent Condensation Heat Transfer On Vertical Cicnt Structured Superhydrophobic Surfaces, Clint Mach Hubbard
Theses and Dissertations
This study experimentally investigates the impact of the subcooling magnitude, the carbon-infiltrated carbon nanotube (CICNT) diameter, the time duration of condensation, and amount of non-condensable gases on the nature of dropwise condensation and condensate removal, and heat flux and heat transfer coefficient measurements. Experiments were conducted in a vacuum chamber on a vertically oriented test CICNT surface. The CICNT diameter was varied between 15-120 nm and the subcooling ranged from 0.5-9 °C. Each test ran for a duration of at least one hour and video was recorded at 20-minute intervals. Three modes of condensation were observed: drop jumping, drop wetting …
A Sensitivity Equation Framework For Parameter Estimation In Dynamical Systems, Joshua Newey
A Sensitivity Equation Framework For Parameter Estimation In Dynamical Systems, Joshua Newey
Theses and Dissertations
We present a new framework for understanding parameter estimation in dynamical systems. The approach is developed within the modeling approach of continuous data assimilation. We outline the basic assumptions that lead to our derivation. Under these assumptions we show that the parameter estimation turns into a finite dimensional nonlinear optimization problem. We show that our derivation reproduces and extends the algorithm originally developed in [9]. We then implement these methods in three example systems: the Lorenz '63 model, the two-layer Lorenz '96 model, and the Kuramoto Sivashinsky equation. So as to remain sufficiently general, our derivations are largely formal; we …
Behavior Of Reinforced Lightweight Cellular Concrete Backfill For Mechanically Stabilized Earth Walls With Welded Wire Reinforcements, Cole Max Larsen
Behavior Of Reinforced Lightweight Cellular Concrete Backfill For Mechanically Stabilized Earth Walls With Welded Wire Reinforcements, Cole Max Larsen
Theses and Dissertations
Lightweight cellular concrete (LCC) consists of a mixture of cement, water, and a pre-formed foam. The pre-formed foam entrains a high proportion of air voids into the cement water slurry at the time of casting, decreasing the product's overall weight. LCC is also a viable alternative when low native soil strengths prevent the use of traditional backfill methods through mitigating settlement and increasing strength. Due to these benefits, the use of LCC behind mechanically stabilized earth (MSE) walls is gaining popularity. Despite LCC gaining popularity behind MSE walls, the exact nature of the failure envelope is poorly understood. The pullout …
A Comparative Analysis Of Human And Machine Translation Quality, Catherine Marshall
A Comparative Analysis Of Human And Machine Translation Quality, Catherine Marshall
Theses and Dissertations
A common question raised by both translators and Machine Translation developers is Will Machine Translation (MT) ever attain the level of Human Translation (HT) quality? Researchers have argued that MT will likely never replace HT completely because MT systems cannot anticipate all the specifications for possible translation projects (Melby & Hague, 2019) and because MT systems lack cultural understanding (Latief et al., 2020). Researchers have also argued that the use of machines should be focused on augmenting humans, rather than trying to imitate them (Brynjolfsson, 2022). The purpose of this study is to determine how the quality of MT differs …
Tools For Planning Multi-Axis Vibration Qualification Tests, Marcus Edward Behling
Tools For Planning Multi-Axis Vibration Qualification Tests, Marcus Edward Behling
Theses and Dissertations
Vibration qualification testing is necessary to ensure that components will endure vibration-induced damage in flight. Multi-axis tests have shown the potential for improvement over single-axis tests, though they require increased planning. This work focuses on planning three critical aspects of these tests: the amount of operational next assembly to include in the test, the size of shakers to use, and the number of shakers to use. Next assembly selection is studied by varying the amount of next assembly included in the lab test, performing physical tests, and comparing the accuracy of environment reconstruction in each test. In doing so, a …
Design For Pullout Resistance And Global Stability Of Metallic Reinforcements In Mse Walls With Lightweight Cellular Concrete Backfill, Joshua Curt Peterson
Design For Pullout Resistance And Global Stability Of Metallic Reinforcements In Mse Walls With Lightweight Cellular Concrete Backfill, Joshua Curt Peterson
Theses and Dissertations
Lightweight cellular concrete (LCC) is a type of concrete that has reduced density and weight compared to traditional concrete. This is achieved by incorporating a large amount of air- filled cells or voids into the mixture. The resulting material is lighter, yet still possesses considerable strength and durability, making it suitable for a range of construction applications, especially in the case of retaining walls because of its reduced weight. Unlike traditional concrete, which can be extremely heavy and place significant stress on the supporting structure, lightweight cellular concrete reduces the pressure on the retaining wall, helping to prevent deformation and …
How Belief In God Impacts Marital Conflict And Resolution For Women Of Faith, Elizabeth Kay Madsen
How Belief In God Impacts Marital Conflict And Resolution For Women Of Faith, Elizabeth Kay Madsen
Theses and Dissertations
Frequent conflict is a significant relationship risk factor for divorce, but it has also been shown that religion strengthens marriages, specifically in ways that give direction and motivation for couples in resolving marital conflict or other marital hardships. Thus, a study of how successful religious couples resolve conflict is pertinent in helping us better understand how to strengthen marriages and families. Our qualitative study of 113 highly religious women of diverse faiths and races found that women's perceived relationship or connection with God reportedly impacted conflict resolution and coping with marital hardship. Results suggest greater reconciliation and unity with the …
Pretty Good State Transfer And Fractional Revival In Double Extended Star Graphs, Kellon G. Sandall
Pretty Good State Transfer And Fractional Revival In Double Extended Star Graphs, Kellon G. Sandall
Theses and Dissertations
Much research has been done in the realm of quantum walks over networks of qubits. We primarily study a type of graph consisting of a path with two stars connected to the leaves which we call a Double Extended Star. We find that Pretty Good State Transfer can occur in many ways in a Double Extended Star and that Fractional Revival cannot occur in Double Extended Stars except when the length of the path within is one.
Demand Side Management Through Integrated Water Distribution Systems And Smart Irrigation Controllers, Nathan T. Lunstad
Demand Side Management Through Integrated Water Distribution Systems And Smart Irrigation Controllers, Nathan T. Lunstad
Theses and Dissertations
The innovation of electrical utilities in creating smart electrical grids has superseded that of water utilities in analogous efforts. While many water utilities are now using smart water technologies, they lack the virtual command center that allows for two-way communication for more effective forecasting, load balancing, preventive methods, emergency and master planning, and level of service delivery while ensuring environmental justice and enhancing the responsible use of resources. In this dissertation, I propose the idea of the Integrated Water Distribution System (IWDS) to overcome this challenge. IWDS coordinates management of water supply and demand in a way that benefits both …
Exploring Co-Manipulation Via A New Decomposition Of Interaction Force And An Exploration Of Signal Space In Multi-Agent Motion Primitives, Kody Blaine Shaw
Exploring Co-Manipulation Via A New Decomposition Of Interaction Force And An Exploration Of Signal Space In Multi-Agent Motion Primitives, Kody Blaine Shaw
Theses and Dissertations
Co-manipulation is when two or more people work together to move an object. In this work, we consider the physical co-manipulation of objects that are large and heavy enough that they are more easily handled by two or more participants. We currently lack a fundamental understanding of how people perform such tasks together, both the basic signals they use to communicate and how those signals are mapped to actions and behaviors. This work builds upon the existing body of knowledge to improve our understanding of physical co-manipulation. Specifically, interaction forces are often considered a key method for information transfer in …
The Effects Of Combining Β-Lactam Antibiotics And Mefloquine In Multi-Drug Resistant Pseudomonas Aeruginosa, Kayla C. Maas
The Effects Of Combining Β-Lactam Antibiotics And Mefloquine In Multi-Drug Resistant Pseudomonas Aeruginosa, Kayla C. Maas
Theses and Dissertations
Pseudomonas aeruginosa, a notorious opportunistic pathogen, is a leading cause of hospital-acquired infections. The newest generation of β-lactam antibiotics, the carbapenems, are often used to treat multi-drug resistant (MDR) P. aeruginosa infections. Treatment of P. aeruginosa has become increasingly difficult due to its remarkable ability to resist antibiotics through various intrinsic and acquired mechanisms. Physicians rely on a limited group of antibiotics to treat these infections, but many P. aeruginosa isolates are evolving to become resistant to all available antibiotics, including carbapenems. The multifaceted mechanisms underlying P. aeruginosa antibiotic resistance include β -lactamases, efflux pumps, altered membrane porins, and antibiotic …
Exploring The Intergenerational Links Between Parent And Child Couple Conflict Styles: Attachment Behaviors And Forgiveness As Moderators, Ashley Forbush
Exploring The Intergenerational Links Between Parent And Child Couple Conflict Styles: Attachment Behaviors And Forgiveness As Moderators, Ashley Forbush
Theses and Dissertations
Conflict is a fundamental element of couple relationships, and the styles of conflict partners use can either enhance or undermine couples' relationship satisfaction and stability. Previous research has found clear links between parent and adult children's conflict strategies, but little is known about how adult children can change their conflict approach from what they observed in their family of origin, especially when they come from homes with dysfunctional forms of conflict. To better understand what factors help children change their style of conflict, the current study used data from 1,077 married couples from the CREATE study. Multinomial logit regression was …
Tribological Analysis Of Heat Treatments On Medical Grade Cobalt Chromium Molybdenum Alloys, Samuel Edis Bowden
Tribological Analysis Of Heat Treatments On Medical Grade Cobalt Chromium Molybdenum Alloys, Samuel Edis Bowden
Theses and Dissertations
Cobalt chromium molybdenum (CoCrMo) has many material properties that make it desirable as a medical hip implant. Due to the range of heat treatments available and the resulting material properties that are present in medical device manufacturing using CoCrMo, many implants are not able to withstand both the chemical and physical wear necessary as a hip replacement. This research looks to examine various heat treatments and their resulting properties to find a desirable heat treatment for CoCrMo in hip implant bearing surfaces. This study was accomplished by using five distinct variations of heat treatment on forged CoCrMo alloy that would …
Extreme Ultraviolet And Xray Applications Of Carbon Nanotube Devices, Scott Olsen
Extreme Ultraviolet And Xray Applications Of Carbon Nanotube Devices, Scott Olsen
Theses and Dissertations
The vacuum ultraviolet (VUV), extreme ultraviolet (EUV) and xray ranges of the electromagnetic spectrum have many unique properties and applications, such as medical treatment, photolithography, and astronomical observation. However, these applications require unique optical element designs, setups, and materials. carbon nanotubes (CNTs) are a fascinating material with thermal, mechanical, and chemical properties that may be beneficial for VUV, EUV, and xray applications. They are conductive, can be patterned into high aspect ratio structures, and are stable in high temperature vacuum. In this work, we report several carbon nanotube devices developed for the VUV, EUV, and xray range. These devices include …