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Articles 2101 - 2130 of 8052
Full-Text Articles in Entire DC Network
Analysis Of Safety Impacts Of Access Management Alternatives Using The Surrogate Safety Assessment Model, Kyung Min Kim
Analysis Of Safety Impacts Of Access Management Alternatives Using The Surrogate Safety Assessment Model, Kyung Min Kim
Theses and Dissertations
In a traditional safety impact analysis, it is necessary to have crash data on existing roadway conditions in the field and a few years must pass before accumulating reliable crash data. This is a time-consuming approach and there remains uncertainty in the crash data due to the random nature of crash occurrences. The Surrogate Safety Assessment Model (SSAM) was developed for resolving these issues. With SSAM, a conflict analysis is performed in a simulated environment. A planned improvement alternative under study is modeled and no physical installation of the alternative is needed. Hence, the method using a simulation software along …
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.
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 …
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 …
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 …
Microstructural Evaluation Of Hydrogen Embrittlement And Successive Recovery In Advanced High Strength Steel, Quentin Scott Allen
Microstructural Evaluation Of Hydrogen Embrittlement And Successive Recovery In Advanced High Strength Steel, Quentin Scott Allen
Theses and Dissertations
Advanced high strength steels (AHSS) have high susceptibility to hydrogen embrittlement, and are often exposed to hydrogen environments in processing. In order to study the embrittlement and recovery of steel, tensile tests were conducted on two different types of AHSS over time after hydrogen charging. Concentration measurements and hydrogen microprinting were carried out at the same time steps to visualize the hydrogen behavior during recovery. The diffusible hydrogen concentration was found to decay exponentially, and equations were found for the two types of steel. Hydrogen concentration decay rates were calculated to be -0.355 /hr in TBF steel, and -0.225 /hr …
Improving Thermodynamic Consistency Among Vapor Pressure, Heat Of Vaporization, And Liquid And Ideal Gas Heat Capacities, Joseph Wallace Hogge
Improving Thermodynamic Consistency Among Vapor Pressure, Heat Of Vaporization, And Liquid And Ideal Gas Heat Capacities, Joseph Wallace Hogge
Theses and Dissertations
Vapor pressure (Pvap), heat of vaporization (ΔHvap), liquid heat capacity (Cpl), and ideal gas heat capacity (Cpig) are important properties for process design and optimization. This work focuses on improving the thermodynamic consistency and accuracy of the aforementioned properties since these can drastically affect the reliability, safety, and profitability of chemical processes. They can be measured for pure organic compounds from the triple point, through the normal boiling point, and up to the critical point. Additionally, ΔHvap is proportional to the derivative of vapor …
The Morphology And Uniformity Of Circumstellar Oh/H2O Masers Around Oh/Ir Stars, Derek Sean Felli
The Morphology And Uniformity Of Circumstellar Oh/H2O Masers Around Oh/Ir Stars, Derek Sean Felli
Theses and Dissertations
Even though low mass stars (< 8 solar masses) vastly outnumber high mass stars (< 8 solar masses), the more massive stars drive the chemical evolution of galaxies from which the next generation of stars and planets can form. Understanding mass loss of asymptotic giant branch stars contributes to our understanding of the chemical evolution of the galaxy, stellar populations, and star formation history. Stars with mass < 8 solar masses form planetary nebulae, while those with mass < 8 solar masses go supernova. In both cases, these stars enrich their environments with elements heavier than simple hydrogen and helium molecules. While some general info about how stars die and form planetary nebulae are known, specific details are missing due to a lack of high-resolution observations and analysis of the intermediate stages. For example, we know that mass loss in stars creates morphologically diverse planetary nebulae, but we do not know the uniformity of these processes, and therefore lack detailed models to better predict how spherically symmetric stars form asymmetric nebulae. We have selected a specific group of late-stage stars and observed them at different scales to reveal the uniformity of mass loss through different layers close to the star. This includes observing nearby masers that trace the molecular shell structure around these stars. This study revealed detailed structure that was analyzed for uniformity to place constraints on how the mass loss processes behave in models. These results will feed into our ability to create more detailed models to better predict the chemical evolution of the next generation of stars and planets.
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 …
Trading Off Sound Pressure Level And Average Power Production For Wind Farm Layout Optimization, Eric Tingey, Andrew Ning
Trading Off Sound Pressure Level And Average Power Production For Wind Farm Layout Optimization, Eric Tingey, Andrew Ning
Faculty Publications
This research explores the trade-offs between a wind farm’s average power production and noise impact on nearby observers. Two specific wind farm designs were studied and optimized using the FLORIS wake model and an acoustic model based on semi-empirical turbine noise calculations. It was found in the two wind farms that the average power production could be increased, up to 8.01% in one and 3.63% in the other, ignoring sound level considerations. Including a noise restriction in the optimization had a minimal impact on the optimal average power production within about a five-decibel range. Past this range, sound limitations decreased …
Quantification Of Short-Term Hydropower Generation Flexibility, Hamid Bashiri Atrabi, Erfaneh Sharifi, Arturo Leon, Yong Chen, Nathan Gibson
Quantification Of Short-Term Hydropower Generation Flexibility, Hamid Bashiri Atrabi, Erfaneh Sharifi, Arturo Leon, Yong Chen, Nathan Gibson
Open Water Journal
The main goal of the current research is to quantify hydropower generation flexibility in a system of ten multi-objective reservoirs on the Federal Columbia River Power System (FCRPS). At a given time step, the flexibility in electricity supply (F(t)) is defined as the remaining capacity after satisfying the scheduled production plan. The scheduled production plan includes the sum of future electricity demand and existing obligatory electricity sales resulting from open market sales of electricity. The time-varying flexibility metric is expressed in energy units (MWh). Estimating the flexibility helps the energy producers to address potential negative shocks in energy …
Valuation Of Flexibility For Optimal Reservoir Operation, Erfaneh Sharifi, Hamid Bashiri, Arturo Leon, Yong Chen, Nathan Gibson
Valuation Of Flexibility For Optimal Reservoir Operation, Erfaneh Sharifi, Hamid Bashiri, Arturo Leon, Yong Chen, Nathan Gibson
Open Water Journal
This research presents a valuation study of flexibility in hydropower generation. Flexibility herein is considered as a stochastic process and is defined as the difference between the maximum hydropower energy generation capacity and the scheduled energy production plan to meet the demand and obligatory sales of electricity. To value the flexibility, this framework combines options theory and the Non-dominated Sorting Genetic Algorithm II (NSGA-II), while this paper focuses only on real option model. Options theory is used in this research to create a framework that can value the flexibility at various levels of risk for a multi-reservoir system. A Black-Scholes-like …
Bare Aluminum Oxidation, R. Steven Turley
Bare Aluminum Oxidation, R. Steven Turley
Faculty Publications
This paper computes the oxidation rate of bare evaporated aluminum thin films under high vacuum conditions and exposed to air.
Characterizing The Electromechanical Response Of Flexible Foam For Multifunctional Impact-Sensing Applications, Evan Troy Bird
Characterizing The Electromechanical Response Of Flexible Foam For Multifunctional Impact-Sensing Applications, Evan Troy Bird
Theses and Dissertations
Flexible foams have unique properties that make them well-suited to several engineering systems. They are often used in impact-related applications because of their superior energy absorption performance. Many multifunctional materials are also derived from flexible foams due to their high customizability, which allows them to satisfy a wide range of performance requirements. Though flexible foams have high potential in these and other classes of material applications, their success relies on the proper characterization of their complex behavior. This thesis promotes the application of flexible foams by characterizing their electromechanical response through both experimental and theoretical approaches. One study in this …
The Intrigue Of Paradigmatic Similarity: Leibniz And China, Yu Liu
The Intrigue Of Paradigmatic Similarity: Leibniz And China, Yu Liu
Comparative Civilizations Review
The cosmology of China is indeed strikingly similar to the metaphysics of Leibniz, but precisely where the two resemble each other, the former is unmistakably different from Christianity. Scholars of Leibniz have so far generally taken it for granted that he was ideologically aligned with Christianity, but his paradigmatic similarity to China should alert us of a surprisingly different story. Leibniz was indisputably “the greatest of the seventeenth century sinophiles” and key Chinese cosmological ideas were introduced to Europe long before he formulated his worldview. Together, these two facts can help us decide whether he “owes to Chinese organic naturalism …
A Reply To Johann Arnason, Toby Huff
A Reply To Johann Arnason, Toby Huff
Comparative Civilizations Review
No abstract provided.
Full Issue, Comparative Civilizations Review
Full Issue, Comparative Civilizations Review
Comparative Civilizations Review
No abstract provided.
Designing Curriculum The Fair Way, Lorraine Wallace
Designing Curriculum The Fair Way, Lorraine Wallace
The Utah English Journal
It was my second year as a teacher, my first year in a new school. In early August, I went to the building and introduced myself to the secretary. She was very pleasant as she escorted me to my new classroom. She opened the door, handed me the key, pointed to the cupboards where books were stored, and told me to let her know if I needed anything. Expecting some type of curriculum guide, I naively asked, “What am I supposed to teach?” “English, of course,” she answered with a laugh that continued as she went down the hall, back …
Hydrodynamic And Thermal Effects Of Sub-Critical Heating On Superhydrophobic Surfaces And Microchannels, Adam M. Cowley
Hydrodynamic And Thermal Effects Of Sub-Critical Heating On Superhydrophobic Surfaces And Microchannels, Adam M. Cowley
Theses and Dissertations
This dissertation focuses on the effects of heating on superhydrophobic (SHPo) surfaces. The work is divided into two main categories: heat transfer without mass transfer and heat transfer in conjunction with mass transfer. Numerical methods are used to explore the prior while experimental methods are utilized for the latter. The numerical work explores convective heat transfer in SHPo parallel plate microchannels and is separated into two stand-alone chapters that have been published archivally. The first considers surfaces with a rib/cavity structure and the second considers surfaces patterned with a square lattice of square posts. Laminar, fully developed, steady flow with …
Highly Compressible Origami Bellows For Harsh Environments, Jared J. Butler
Highly Compressible Origami Bellows For Harsh Environments, Jared J. Butler
Theses and Dissertations
The use of origami-based bellows is of interest in fields where traditional metal bellows are incapable of meeting compression, mass, or flexibility constraints. Metal bellows are often used in space applications but frequently complicate spacecraft design. Origami-based bellows capable of meeting design constraints while adequately shielding sensitive spacecraft parts may be advantageous to space mechanism design. The design and testing of a highly compressible origami bellows for harsh environments is described. Several origami patterns were evaluated and the Kresling fold pattern was designed to meet constraints and selected for use in the bellows design. Origami bellows were prototyped in five …
40ar/39ar Ages, Compositions, And Likely Source Of The Eocene Fallout Tuffs In The Duchesne River Formation, Northeastern Utah, Michael Seth Jensen
40ar/39ar Ages, Compositions, And Likely Source Of The Eocene Fallout Tuffs In The Duchesne River Formation, Northeastern Utah, Michael Seth Jensen
Theses and Dissertations
Thin fallout tuffs in the Duchesne River Formation in the Uinta Basin, Utah are evidence that volcanism was active in northern Nevada and Utah in the late Eocene. The Uinta Basin is a sedimentary basin that formed during the Laramide orogeny. Ponded lakes of various salinity filled and emptied and during the late Eocene the northern rim was dominated by a wetland/floodplain depositional setting. Most of the tuffs have rhyolitic mineral assemblages including quartz, biotite, sanidine, and allanite. Rhyolitic glass shards were also found in one of the ash beds. Biotite compositions have Fe/(Fe+Mg) ratios typical of calc-alkaline igneous rocks …
Developing New Classes Of Thick-Origami-Based Mechanisms: Conceal-And-Reveal Motion And Folding Printed Circuit Boards, Bryce Parker De Figueiredo
Developing New Classes Of Thick-Origami-Based Mechanisms: Conceal-And-Reveal Motion And Folding Printed Circuit Boards, Bryce Parker De Figueiredo
Theses and Dissertations
Origami-adapted mechanisms form the basis of an increasing number of engineered systems. As most of these systems require the use of non-paper materials, various methods for accommodating thickness have been developed. These methods have opened new avenues for origami-based design. This work introduces approaches for the design of two new classes of thick-origami systems and demonstrates the approaches in hardware. One type of system, called "conceal-and-reveal,'' is introduced, and a method of designing these mechanisms is developed. Techniques are also developed for designing folding printed circuit boards which are fabricated from a single sheet of material. This enables areas of …
40Ar/39Ar Ages, Compositions, And Likely Source Of The Eocene Fallout Tuffs In The Duchesne River Formation, Northeastern Utah, Michael Seth Jensen
40Ar/39Ar Ages, Compositions, And Likely Source Of The Eocene Fallout Tuffs In The Duchesne River Formation, Northeastern Utah, Michael Seth Jensen
Theses and Dissertations
Thin fallout tuffs in the Duchesne River Formation in the Uinta Basin, Utah are evidence that volcanism was active in northern Nevada and Utah in the late Eocene. The Uinta Basin is a sedimentary basin that formed during the Laramide orogeny. Ponded lakes of various salinity filled and emptied and during the late Eocene the northern rim was dominated by a wetland/floodplain depositional setting. Most of the tuffs have rhyolitic mineral assemblages including quartz, biotite, sanidine, and allanite. Rhyolitic glass shards were also found in one of the ash beds. Biotite compositions have Fe/(Fe+Mg) ratios typical of calc-alkaline igneous rocks …
Iq: Greatly Influenced By Early Family Life
Iq: Greatly Influenced By Early Family Life
Intuition: The BYU Undergraduate Journal of Psychology
For many years, psychologists and researchers have been interested in the nature and nurture debate with regards to IQ. Some have claimed that IQ is something that can be passed on through genetics and is an inherited trait. Others have declared that IQ level is not something passed on through genetics, but rather something determined by experiences one has in his or her life. This review was created to discuss how a child's IQ may be affected by early family life, a factor that requires more attention in the literature. This report will discuss how early child-parent experiences, intimate relationships …
Tokenism In Non-Native English Speakers: Does It Affect Their English Testing Abilities?
Tokenism In Non-Native English Speakers: Does It Affect Their English Testing Abilities?
Intuition: The BYU Undergraduate Journal of Psychology
This study was conducted with 16 international non-native English speaking undergraduate students to examine the impact of tokenism on such students' test-taking performance. The students were divided into two testing conditions. The experimental group was given a modified GRE verbal ability test in a room with three native English speaking confederates. The control group was given the same test in the presence of fellow international students. The purpose was to compare test results of the two groups, taking into account participants' TOEFL scores, age, and length of stay in the United States. A significant difference was found between the experimental …
Discrete Pre-Processing Step Effects In Registration-Based Pipelines, A Preliminary Volumetric Study On T1-Weighted Images, Nathan M. Muncy, Ariana M. Hedges-Muncy, C. Brock Kirwan
Discrete Pre-Processing Step Effects In Registration-Based Pipelines, A Preliminary Volumetric Study On T1-Weighted Images, Nathan M. Muncy, Ariana M. Hedges-Muncy, C. Brock Kirwan
Faculty Publications
Pre-processing MRI scans prior to performing volumetric analyses is common practice in MRI studies. As pre-processing steps adjust the voxel intensities, the space in which the scan exists, and the amount of data in the scan, it is possible that the steps have an effect on the volumetric output. To date, studies have compared between and not within pipelines, and so the impact of each step is unknown. This study aims to quantify the effects of preprocessing steps on volumetric measures in T1-weighted scans within a single pipeline. It was our hypothesis that pre-processing steps would significantly impact ROI volume …
11.2 Complete
Intuition: The BYU Undergraduate Journal of Psychology
No abstract provided.
The Touchscreen Advantage: Understanding The Educational Value Of Touchscreen Applications For Preschool-Age Children
Intuition: The BYU Undergraduate Journal of Psychology
No abstract provided.
Usable Secure Email Through Short-Lived Keys, Tyler Jay Monson
Usable Secure Email Through Short-Lived Keys, Tyler Jay Monson
Theses and Dissertations
Participants from recent secure email user studies have expressed a need to use secure email tools only a few times a year. At the same time, Internet users are expressing concerns over the permanence of personal information on the Internet. Support for short-lived keys has the potential to address both of these problems. However, the short-lived keys usability and security space is underdeveloped and unexplored. In this thesis, we present an exploration of the short-lived keys usability and security design space. We implement both a short-lived keys and a long-term keys secure email prototype. With these two prototypes, we conduct …
Characterization Of Military Aircraft Jet Noise Using Wavepacket Analysis And Other Array Processing Methods, Blaine M. Harker
Characterization Of Military Aircraft Jet Noise Using Wavepacket Analysis And Other Array Processing Methods, Blaine M. Harker
Theses and Dissertations
Sound generation and radiation properties are studied of full-scale tactical jet engine noise. This is motivated by the high sound exposure levels from jet noise, particularly for tactical engines. Acoustic source reconstruction methods are implemented computationally on existing jet noise data. A comparative study is performed using numerical simulations to understand the capabilities of more advanced beamforming methods to successfully estimate the source properties of a distributed, partially correlated source distribution. The properties and limitations of each beamforming method are described. Having validated the methods, beamforming with regularization—via the Hybrid Method—is implemented on linear array measurements near an installed tactical …