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Carbon Nanotube Prosthetic Venous Valve, Ryan Coulton Packer
Carbon Nanotube Prosthetic Venous Valve, Ryan Coulton Packer
Theses and Dissertations
Chronic Venous Insufficiency (CVI) is a disease of the lower limbs that affects millions of people in the United States. It is categorized by constant venous hypertension, which can lead to swelling of the legs, pain, skin changes and ulcers. One of the widely known symptoms that can lead to CVI is varicose veins. The main source of the problem of CVI is incompetent venous valves. The purpose of venous valves is to direct blood through the veins to the heart and prevent retrograde flow to the lower limbs. CVI can be caused by leg injury, pregnancy, genetics, age, and …
A Robust Synthetic Basis Feature Descriptor Implementation And Applications Pertaining To Visual Odometry, Object Detection, And Image Stitching, Lindsey Ann Raven
A Robust Synthetic Basis Feature Descriptor Implementation And Applications Pertaining To Visual Odometry, Object Detection, And Image Stitching, Lindsey Ann Raven
Theses and Dissertations
Feature detection and matching is an important step in many object tracking and detection algorithms. This paper discusses methods to improve upon previous work on the SYnthetic BAsis feature descriptor (SYBA) algorithm, which describes and compares image features in an efficient and discreet manner. SYBA utilizes synthetic basis images overlaid on a feature region of interest (FRI) to generate binary numbers that uniquely describe the feature contained within the FRI. These binary numbers are then used to compare against feature values in subsequent images for matching. However, in a non-ideal environment the accuracy of the feature matching suffers due to …
Tribopairs In Wellbore Drilling: A Study Of Pcd Tilting Pad Bearings In An Electric Submersible Pump, Cameron B. Ellis
Tribopairs In Wellbore Drilling: A Study Of Pcd Tilting Pad Bearings In An Electric Submersible Pump, Cameron B. Ellis
Theses and Dissertations
A polycrystalline diamond was tested as a bearing material for a tilting pad thrust bearing to be used in an electric submersible pump, which elevates process fluids from the bottom of well bores. The goal of this study was to compare the PCD to a current best of technology, which is stainless steel with an engineering polymer.This study found that PCD can handle larger loads than current technology but is limited in size due to diamond sintering and manufacturing constraints. The maximum size is Ø75mm.
Association Between Latent Toxoplasma Gondii Infection And Alzheimer's Disease, Cynthia Elizabeth Wyman
Association Between Latent Toxoplasma Gondii Infection And Alzheimer's Disease, Cynthia Elizabeth Wyman
Theses and Dissertations
Introduction: Many studies have found an association between Toxoplasma gondii seropositivity and behavioral and cognitive changes in animal models and in humans. In addition, early findings have suggested an association between T. gondii seropositivity and Alzheimer's disease (AD). We sought to determine whether there is an association between T. gondii seropositivity and AD as well as cognitive functioning (including memory, working memory, processing speed, language functioning, executive functioning) in a large, well-characterized sample of subjects with AD and matched controls without dementia. Method: Using ELISA assays, we determined anti-T. gondii IgG antibody titers in 114 control subjects and in …
How President Barack Obama Reshaped The Rhetorical Presidency By Slow Jamming The News, Preston Haycock Wittwer
How President Barack Obama Reshaped The Rhetorical Presidency By Slow Jamming The News, Preston Haycock Wittwer
Theses and Dissertations
The rhetorical presidency encompasses all the ways a president communicates and acts. These rhetorical elements of the job are not prescribed in the Constitution and as a result it is the presidents themselves who help shape the cultural understanding of presidentiality, of what it means to be president. When President Barack Obama participated in a "Slow Jam the News" comedy sketch on Late Night with Jimmy Fallon in 2012, he took the rhetorical presidency to a place it had never been before. This choice established a new genre of presidential rhetoric that President Obama would rely on throughout his time …
Real-Time Beamforming Algorithms For The Focal L-Band Array On The Green Bank Telescope, Mark William Ruzindana
Real-Time Beamforming Algorithms For The Focal L-Band Array On The Green Bank Telescope, Mark William Ruzindana
Theses and Dissertations
A phased array feed (PAF) provides a contiguous, electronically synthesized wide field of view for large-dish astronomical observatories. Significant progress has been made in recent years in improving the sensitivity of PAF receivers though optimizing the design of the antenna array, cryogenic cooling of the front end, and implementation of real-time correlation and beamforming in digital signal processing. FLAG is a 19 dual-polarized element phased array with cryogenic LNAs, direct digitization of RF signals at the front end, digital signal transport over fiber, and a real time signal processing back end with up to 150 MHz bandwidth. The digital back …
Quantitative Morphological Classification Of Planetary Craterforms Using Multivariate Methods Of Outline-Based Shape Analysis, Thomas Joseph Slezak
Quantitative Morphological Classification Of Planetary Craterforms Using Multivariate Methods Of Outline-Based Shape Analysis, Thomas Joseph Slezak
Theses and Dissertations
Craters formed by impact and volcanic processes are among the most fundamental planetary landforms. This study examines the morphology of diverse craterforms on Io, the Moon, Mars, and Earth using quantitative, outline-based shape analysis and multivariate statistical methods to evaluate the differences between different types of. Ultimately, this should help establish relationships between the form and origin of craterforms. Developed in the field of geometric morphometrics by paleontological and biological sciences communities, these methods were used for the analysis of the shapes of crater outlines. The shapes of terrestrial ash-flow calderas, terrestrial basaltic shield calderas, martian calderas, Ionian paterae, and …
Livy's Republic: Reconciling Republic And Princeps In Ab Urbe Condita, Joshua Stewart Mackay
Livy's Republic: Reconciling Republic And Princeps In Ab Urbe Condita, Joshua Stewart Mackay
Theses and Dissertations
As early as Tacitus, Livian scholarship has struggled to resolve the "Livian paradox," the conflict between Livy's support of the Roman Republic and his overt approval of Augustus, who brought about the end of the Republic. This paper addresses the paradox by attempting to place Livy's writings within their proper historical and literary context. An examination of Augustus' position during the early years of Livy's writing shows that the princeps cloaked his power within the precedent of Republican autocracy, in which imperium could be unlimited in power so long as it was limited by time. As a result, although Augustus' …
Multilingual Trends In Five London Boroughs: A Linguistic Landscape Approach, Shayla Ann Johnson
Multilingual Trends In Five London Boroughs: A Linguistic Landscape Approach, Shayla Ann Johnson
Theses and Dissertations
Although multilingualism has been investigated in London, no studies have addressed the multilingual linguistic landscape of this linguistically diverse globalized mega-city. In addition, no previous research has addressed the linguistic impacts of colonialism on the colonizer with respect to signage in the linguistic landscape. With increasing rates of immigration and globalization in London, it is advantageous to fully document and research the nature of the linguistic landscape in order to create a baseline for future comparison. Consequently, aspects of the linguistic landscape of five London boroughs were collected and analyzed in terms of 2,062 signage items. The study noted multilingual …
Design And Analysis Of Compressed Air Power Harvesting Systems, Zachary James Sadler
Design And Analysis Of Compressed Air Power Harvesting Systems, Zachary James Sadler
Theses and Dissertations
Procedure for site discovery, system design, and optimization of power harvesting systems is developed with an emphasis on application to air compressors. Limitations for the usage of infrared pyrometers is evaluated. A system of governing equations for thermoelectric generators is developed. A solution method for solving the system of equations is created in order to predict power output from the device. Payback analysis is proposed for determining economic viability. A genetic algorithm is used to optimize the power harvesting system payback with changing quantities and varieties of thermoelectric generators, as well as the back work put into cooling the thermoelectric …
Understanding Community And Ecophysiology Of Plant Species On The Colorado Plateau, Hannah Elizabeth Yokum
Understanding Community And Ecophysiology Of Plant Species On The Colorado Plateau, Hannah Elizabeth Yokum
Theses and Dissertations
The intensification of aridity due to anthropogenic climate change is likely to have a large impact on the growth and survival of plant species in the southwestern U.S. where species are already vulnerable to high temperatures and limited precipitation. Global climate change impacts plants through a rising temperature effect, CO2 effect, and land management. In order to forecast the impacts of global climate change, it is necessary to know the current conditions and create a baseline for future comparisons and to understand the factors and players that will affect what happens in the future. The objective of Chapter 1 is …
"What More Could I Have Done?" A Graduate Student's Experience Teaching Writing About Writing, Lena May Harper
"What More Could I Have Done?" A Graduate Student's Experience Teaching Writing About Writing, Lena May Harper
Theses and Dissertations
As writing about writing (WAW) research enters its "second wave," characterized not only by an increase in data-driven studies that theorize and assess the effectiveness of WAW curricula (Downs) but also by an increase in its prominence and adaptation, particularly among emerging writing studies scholars and teachers (e.g., Bird et al.), a space has opened for more and varied types of research, especially empirical research, to determine its effectiveness and to produce more solid recommendations for training and curriculum development, especially for those who are new to the field. This case study, which highlights how a novice teacher responds to …
"To You I Give Myself, For I Am Yours": Editorial Giving And Taking In Shakespeare's As You Like It, Jennifer Jean Thorup
"To You I Give Myself, For I Am Yours": Editorial Giving And Taking In Shakespeare's As You Like It, Jennifer Jean Thorup
Theses and Dissertations
In As You Like It 5.4.107-08 we receive Rosalind returning as herself—a woman—no longer in the guise of Ganymede, the "boy" page. Her first lines upon returning are repetitive: "To you I give myself, for I am yours [To Duke Senior] / To you I give myself, for I am yours [To Orlando]." However, comparing Folio versions of these lines produces a provocative variant. In the third and fourth folios, these lines are no longer a repetitious patriarchal pledging, but a tender dialogic exchange—much like vows—between Rosalind and Orlando. While none of our modern Shakespeare editions make a note of …
Eigenblades: Application Of Computer Vision And Machine Learning For Mode Shape Identification, Alex W. La
Eigenblades: Application Of Computer Vision And Machine Learning For Mode Shape Identification, Alex W. La
Theses and Dissertations
On August 27, 2016, Southwest Airlines flight 3472 from New Orleans to Orlando had to perform an emergency landing when a fan blade separated from the engine hub and destroyed the cowling and punctured the fuselage. Initial findings from the metallurgical examination conducted in the National Transpiration Safety Board Materials Laboratory found that the fracture surface of the missing blade showed curving crack arrest lines consistent with fatigue crack growth. Fatigue is often cause by resonate vibrations. Modal analysis is a method that can model the natural frequencies and bending modes of turbomachinery blades. When performing modal analysis with finite …
"Speak Up!" An Examination Of The Language Abilities Of Children Displaying Various Forms Of Social Withdrawal And Aggression, Brandon Neil Clifford
"Speak Up!" An Examination Of The Language Abilities Of Children Displaying Various Forms Of Social Withdrawal And Aggression, Brandon Neil Clifford
Theses and Dissertations
Language serves as a mechanism through which children are able to interact and communicate with their others. Thus, when children do not produce language at a typical pace, there may be cause for concern. The primary purpose of the current study was to examine the language abilities of children displaying various forms of social withdrawal and children engaging in subtypes of aggression. Participants came from the Brigham Young University Child Laboratory (N = 141; Mage = 4.57; 53% female) and were observed and teachers and parents completed reports on children's behaviors and demographics. Results revealed reticent and solitary-passive children …
Using Remote Cameras To Estimate The Abundance Of Ungulates, Jace C. Taylor
Using Remote Cameras To Estimate The Abundance Of Ungulates, Jace C. Taylor
Theses and Dissertations
Many wildlife populations globally are experiencing unprecedented declines, and without accurate and precise estimates of abundance, we will not be able to conserve these vulnerable species. Remote cameras have rapidly advanced as wildlife monitoring tools and may provide accurate and precise estimates of abundance that improve upon traditional methods. Using remote cameras to estimate abundance may be less expensive, less intrusive, less dangerous, and less time consuming than other methods. While it is apparent that remote cameras have a place in the future of wildlife monitoring, research, and management, many questions remain concerning the proper use of these tools. In …
Response Inhibition To High Calorie Food Cues Among Adolescents Following Active And Sedentary Video Game Play Using A Go/No-Go Task: A Randomized Crossover Study, Joshua L. Smith
Theses and Dissertations
Sedentary behaviors, such as leisure time computer use and sedentary video games, are significant barriers to regular physical activity and contribute to high rates of overweight and obesity among adolescents. Sedentary screen time can adversely affect food intake and food selection. Active video games may be a promising way of increasing daily physical activity levels among adolescents. Active video games may help modulate response inhibition and food intake. PURPOSE: Compare the effects of an acute bout of active and sedentary video gaming on N2 amplitudes (while viewing high calorie and low calorie images), Stroop Color Word Test (Stroop test) performance …
Computational Exploration Of Vortex Nucleation In Type Ii Superconductors Using A Finite Element Method In Ginzburg-Landau Theory, Alden Roy Pack
Computational Exploration Of Vortex Nucleation In Type Ii Superconductors Using A Finite Element Method In Ginzburg-Landau Theory, Alden Roy Pack
Theses and Dissertations
Using a finite element method, we numerically solve the time-dependent Ginzburg-Landau equations of superconductivity to explore vortex nucleation in type II superconductors. We consider a cylindrical geometry and simulate the transition from a superconducting state to a mixed state. Using saddle-node bifurcation theory we evaluate the superheating field for a cylinder. We explore how surface roughness and thermal fluctuations influence vortex nucleation. This allows us to simulate material inhomogeneities that may lead to instabilities in superconducting resonant frequency cavities used in particle accelerators.
Tribopairs In Wellbore Drilling: A Study Of Pcd Tilting Pad Bearings In An Electric Submersible Pump, Cameron B. Ellis
Tribopairs In Wellbore Drilling: A Study Of Pcd Tilting Pad Bearings In An Electric Submersible Pump, Cameron B. Ellis
Theses and Dissertations
A polycrystalline diamond was tested as a bearing material for a tilting pad thrust bearing to be used in an electric submersible pump, which elevates process fluids from the bottom of well bores. The goal of this study was to compare the PCD to a current best of technology, which is stainless steel with an engineering polymer.This study found that PCD can handle larger loads than current technology but is limited in size due to diamond sintering and manufacturing constraints. The maximum size is Ø75mm.
Dissolved Organic Carbon And Dissolved Metal Pulses During Snowmelt Runoff In The Upper Provo River Watershed, Utah, Usa, Hannah Nicole Checketts
Dissolved Organic Carbon And Dissolved Metal Pulses During Snowmelt Runoff In The Upper Provo River Watershed, Utah, Usa, Hannah Nicole Checketts
Theses and Dissertations
Snowmelt river systems exhibit seasonal fluxes in water chemistry, potentially affecting the water supply of one-sixth of the worlds population. In this study, we examined water chemistry of the upper Provo River, northern Utah, which supplies water to over two million people along the urban Wasatch Front. Seasonal changes in water chemistry were characterized by analyzing discharge and dissolved organic carbon (DOC) with dissolved trace metal and cation concentrations (La, Pb, Cu, Al, Be, Sr and K) over three consecutive water years 20142016, with intensive sampling during snowmelt runoff. To better understand links between metal movement and DOC, we sampled …
Reliability Of Feqdrain For Modeling Performance Of Sand Treated With Large-Diameter Prefabricated Drains For Liquefaction Mitigation, Travis Hatch Meservy
Reliability Of Feqdrain For Modeling Performance Of Sand Treated With Large-Diameter Prefabricated Drains For Liquefaction Mitigation, Travis Hatch Meservy
Theses and Dissertations
Finite element modeling of laminar shear box testing that consisted of loose sand treated with large diameter prefabricated vertical drains (PVDs), was performed. The objective of the modeling was to evaluate the reliability of the computer program FEQDrain for predicting excess pore pressure ratios (Ru) at sites treated with prefabricated drains. FEQDrain was found to be capable of successfully modeling measured excess pore pressure ratio time histories from the laminar shear box experiment, as long as an appropriate combination of €˜number of equivalent cycles and €˜shaking duration was chosen, and sensitive parameters were in the range of measured values. Hydraulic …
An Investigation Of Elementary Teachers<'> Self-Efficacy For And Beliefs About The Importance Of Engineering Education, Khristen Lee Massic
An Investigation Of Elementary Teachers<'> Self-Efficacy For And Beliefs About The Importance Of Engineering Education, Khristen Lee Massic
Theses and Dissertations
In order for the United States to regain its global standing in science and engineering, educational and governmental organizations have started to re-emphasize science, technology, engineering, and math content in k-12 classrooms.While some preliminary research has been conducted on student and teacher perceptions related to engineering, there has been little research conducted related to teachers beliefs about the importance of engineering content in their classrooms and relatively few studies have investigated elementary teachers teaching engineering self-efficacy. Current studies have investigated the impact of professional development on teachers teaching engineering self-efficacy but these studies were conducted with limited sample sizes, for …
A Comparative Literature Review Of Intelligent Tutoring Systems From 1990-2015, Brice Robert Colby
A Comparative Literature Review Of Intelligent Tutoring Systems From 1990-2015, Brice Robert Colby
Theses and Dissertations
This paper sought to accomplish three goals. First, it provided a systematic, comparative review of several intelligent tutoring systems (ITS). Second, it summarized problems and solutions presented and solved by developers of ITS by consolidating the knowledge of the field into a single review. Third, it provided a unified language from which ITS can be reviewed and understood in the same context. The findings of this review centered on the 5-Component Framework. The first component, the domain model, showed that most ITS are focused on science, technology, and mathematics. Within these fields, ITS generally have mastery learning as the desired …
Capacity Of Human Immunodeficiency Virus Targeting Chimeric Antigen Receptor T Cells To Eliminate Follicular Dendritic Cells Bearing Human Immunodeficiency Virus Immune Complexes, Matthew T. Ollerton
Capacity Of Human Immunodeficiency Virus Targeting Chimeric Antigen Receptor T Cells To Eliminate Follicular Dendritic Cells Bearing Human Immunodeficiency Virus Immune Complexes, Matthew T. Ollerton
Theses and Dissertations
An important obstacle to a functional cure for HIV/AIDS is the persistence of viral reservoirs found throughout the body in various cells and tissues. Reservoirs can be latently infected cells, or in the case of follicular dendritic cells (FDC), non-infected cells that trap infectious virus on their surface through immune complexes (HIV-IC). Although several strategies have been employed to target and eliminate viral reservoirs, they are short-lived and ineffective. In an attempt to provide a long-term approach, chimeric antigen receptor T (CAR-T) cells were designed to eliminate native HIV on FDCs. Although effective at eliminating HIV-infected cells, and halting spreading …
Effects Of Teacher Praise And Reprimand Rates On Classroom Engagement And Disruptions Of Elementary Students At Risk For Emotional And Behavioral Disorders, Kade Rolan Downs
Effects Of Teacher Praise And Reprimand Rates On Classroom Engagement And Disruptions Of Elementary Students At Risk For Emotional And Behavioral Disorders, Kade Rolan Downs
Theses and Dissertations
In the United States educators often feel underprepared to manage student behavior in the classroom, which management is crucial for students with or at risk for Emotional and Behavioral Disorders (EBD) to learn effectively. Research on School-wide Positive Behavior Support (SWPBS) programs has reflected how effective simple principles, such as increasing teacher praise and decreasing teacher reprimands, can be. The current study is a secondary analysis of data originally gathered from 65 teachers and 239 students across three states. Results of these analyses bring principles of effective SWPBS programs and educator needs together by identifying how teacher behaviors correlated with …
Understanding Community And Ecophysiology Of Plant Species On The Colorado Plateau, Hannah Elizabeth Yokum
Understanding Community And Ecophysiology Of Plant Species On The Colorado Plateau, Hannah Elizabeth Yokum
Theses and Dissertations
The intensification of aridity due to anthropogenic climate change is likely to have a large impact on the growth and survival of plant species in the southwestern U.S. where species are already vulnerable to high temperatures and limited precipitation. Global climate change impacts plants through a rising temperature effect, CO2 effect, and land management. In order to forecast the impacts of global climate change, it is necessary to know the current conditions and create a baseline for future comparisons and to understand the factors and players that will affect what happens in the future. The objective of Chapter 1 is …
Association Between Latent Toxoplasma Gondii Infection And Alzheimer's Disease, Cynthia Elizabeth Wyman
Association Between Latent Toxoplasma Gondii Infection And Alzheimer's Disease, Cynthia Elizabeth Wyman
Theses and Dissertations
Introduction: Many studies have found an association between Toxoplasma gondii seropositivity and behavioral and cognitive changes in animal models and in humans. In addition, early findings have suggested an association between T. gondii seropositivity and Alzheimer's disease (AD). We sought to determine whether there is an association between T. gondii seropositivity and AD as well as cognitive functioning (including memory, working memory, processing speed, language functioning, executive functioning) in a large, well-characterized sample of subjects with AD and matched controls without dementia. Method: Using ELISA assays, we determined anti-T. gondii IgG antibody titers in 114 control subjects and in 105 …
How President Barack Obama Reshaped The Rhetorical Presidency By Slow Jamming The News, Preston Haycock Wittwer
How President Barack Obama Reshaped The Rhetorical Presidency By Slow Jamming The News, Preston Haycock Wittwer
Theses and Dissertations
The rhetorical presidency encompasses all the ways a president communicates and acts. These rhetorical elements of the job are not prescribed in the Constitution and as a result it is the presidents themselves who help shape the cultural understanding of presidentiality, of what it means to be president. When President Barack Obama participated in a œSlow Jam the News comedy sketch on Late Night with Jimmy Fallon in 2012, he took the rhetorical presidency to a place it had never been before. This choice established a new genre of presidential rhetoric that President Obama would rely on throughout his time …
"What More Could I Have Done?" A Graduate Student's Experience Teaching Writing About Writing, Lena May Harper
"What More Could I Have Done?" A Graduate Student's Experience Teaching Writing About Writing, Lena May Harper
Theses and Dissertations
As writing about writing (WAW) research enters its second wave, characterized not only by an increase in data-driven studies that theorize and assess the effectiveness of WAW curricula (Downs) but also by an increase in its prominence and adaptation, particularly among emerging writing studies scholars and teachers (e.g., Bird et al.), a space has opened for more and varied types of research, especially empirical research, to determine its effectiveness and to produce more solid recommendations for training and curriculum development, especially for those who are new to the field. This case study, which highlights how a novice teacher responds to …
Eigenblades: Application Of Computer Vision And Machine Learning For Mode Shape Identification, Alex W. La
Eigenblades: Application Of Computer Vision And Machine Learning For Mode Shape Identification, Alex W. La
Theses and Dissertations
On August 27, 2016, Southwest Airlines flight 3472 from New Orleans to Orlando had to perform an emergency landing when a fan blade separated from the engine hub and destroyed the cowling and punctured the fuselage. Initial findings from the metallurgical examination conducted in the National Transpiration Safety Board Materials Laboratory found that the fracture surface of the missing blade showed curving crack arrest lines consistent with fatigue crack growth. Fatigue is often cause by resonate vibrations. Modal analysis is a method that can model the natural frequencies and bending modes of turbomachinery blades. When performing modal analysis with finite …