Digital Commons Network^™

3d Permeability Characterization Of Sheared Fiber Reinforcement For Liquid Composite Molding Process Simulation, Collin William Childs

Theses and Dissertations

Resin transfer molding (RTM) is an infusion-based closed-mold manufacturing process where resin is injected into a preform of dry reinforcement to create a net shape part. Often, when a preform is draped over a mold with complex geometry, such as the double curvature of a dome, a reorientation of the fibers takes place in the form of in-plane shear. This deformation of the reinforcement structure has the potential to adversely affect the resin flow and the filling of the mold during RTM if the manufacturer fails to properly account for the shear effects. Various process simulation tools are being developed …

Partial Circuit Replication For Masking And Detecting Soft Errors In Sram-Based Fpgas, Andrew Mark Keller

Theses and Dissertations

Partial circuit replication is a soft error mitigation technique that uses redundant copies of a circuit to mask or detect the effects of soft errors. By masking or detecting the effect of soft errors on SRAM-based FPGAs, implemented circuits can be made more reliable. The technique is applied selectively, to only a portion of the components within a circuit. Partial application lowers the cost of implementation. The objective of partial circuit replication is to provide maximal benefit at limited or minimized cost. The greatest challenge of partial circuit replication is selecting which components within a circuit to replicate. This dissertation …

The Development Of A Social And Emotional Well-Being Scale Using Esem And Cfa: Synergistic Stories In Complex Models, Christopher Hughes Busath

Theses and Dissertations

School districts face unique challenges as they implement social and emotional learning (SEL) initiatives, particularly when choosing or developing a high-quality scale to measure non-academic competencies. Like collaborations with the CORE school districts described by West, Buckley, et al. (2018) and the Washoe County School District described by Davidson et al. (2018), Alpine School District (ASD) partnered with Brigham Young University (BYU) to develop a scale (80 items) that reflected their Vision for Learning framework. In this pilot study, I describe the collaborative and iterative process used to develop a shortened version of the ASD Social and Emotional Well-Being Scale …

A Brief History Of Writing From The Perspective Of Restoration Scripture, Noel B. Reynolds

Faculty Publications

This paper brings together selected insights of modern epigraphers who study the languages and texts of the ancient near east to illuminate how we should understand the composition and history of central texts in the Bible and the Book of Mormon.

Computing Agent Competency In First Order Markov Processes, Xuan Cao

Theses and Dissertations

Artificial agents are usually designed to achieve specific goals. An agent's competency can be defined as its ability to accomplish its goals under different conditions. This thesis restricts attention to a specific type of goal, namely reaching a desired state without exceeding a tolerance threshold of undesirable events in a first-order Markov process. For such goals, the state-dependent competency for an agent can be defined as the probability of reaching the desired state without exceeding the threshold and within a time limit given an initial state. The thesis further defines total competency as the set of state-dependent competency relationships over …

Zeros Of A Two-Parameter Family Of Harmonic Trinomials, David Work

Theses and Dissertations

This thesis studies complex harmonic polynomials of the form $f(z) = az^n + b\bar{z}^k+z$ where $n, k \in \mathbb{Z}$ with $n > k$ and $a, b > 0$. We show that the sum of the orders of the zeros of such functions is $n$ and investigate the locations of the zeros, including whether the zeros are in the sense-preserving or sense-reversing region and a set of conditions under which zeros have the same modulus. We also show that the number of zeros ranges from $n$ to $n+2k+2$ as long as certain criteria are met.

Cedar: A Dimensionally Adaptive Flow Solver For Cylindrical Combustors, Ty R. Hosler

Theses and Dissertations

This thesis discusses the application, evaluation, and extension of dimensionally adaptive meshing to the numerical solution of velocity and pressure fields inside cylindrical reactors. Due to the high length to diameter ratios of many cylindrical reactor vessels the flow field can become axisymmetric, allowing for simplification of the governing equations and significant reduction in computational time required for solution. A fully 3D solver is developed from existing computational tools at BYU and validated against theoretical velocity profiles for pipe flow at various Reynolds numbers, as well as with experimental data for an axial-fired center jet with recirculating flow. Dimensionally adaptive …

Fabrication Of Advanced Materials For Chromatography, Sample Preparation, And Separations, And Accompanying Material Characterization, Dhananjay I. Patel

Theses and Dissertations

My dissertation primarily focuses on the fabrication of materials for solid phase microextraction (SPME) and separation devices. In my first project, I used direct current magnetron sputtering (DCMS) to prepare sputtered silicon coatings on fused silica fibers. These fibers were then subjected to the chemical vapor deposition of 6-phenyhexylsilane (6-PH) as a stationary phase. Six different types of fibers were made using two different throw distances (4 cm and 20 cm) and three different silicon thicknesses (0.5, 1.8, and 2.8 µm). These coatings were characterized by time-of-flight secondary ion mass spectrometry (ToF-SIMS), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), …

Weak Cayley Table Groups Of Crystallographic Groups, Rebeca Ann Paulsen

Theses and Dissertations

Let G be a group. A weak Cayley table isomorphism $\phi$: G $\rightarrow$ G is a bijection satisfying two conditions: (i) $phi$ sends conjugacy classes to conjugacy classes; and (ii) $\phi$(g1)$\phi$(g2) is conjugate to $\phi$(g1g2) for all g1, g2 in G. The set of all such mappings forms a group W(G) under composition. We study W(G) for fifty-six of the two hundred nineteen three-dimensional crystallographic groups G as well as some other groups. These fifty-six groups are related to our previous work on wallpaper groups.

Quantification Of Eccentricity In Stems Of Two Species Of Purshia, Lance S. Evans

Western North American Naturalist

Plants of Purshia tridentata and Purshia stansburyana, 2 shrub species from the western United States, naturally display eccentric stem growth. The purpose of this study was to quantitatively document stem eccentricity for these 2 species. Stem segments were obtained from 3 different plants of each species at locations in central Utah. Each stem was sawed into 8-mm sections and photographed for analysis. Every stem section was then marked at a 36° interval to produce 10 wedge-shaped sectors. The areas of each sector were determined and analyzed. Stem segment areas were about 40, 60, and 100 mm² for stem …

Chemical And Physical Weathering Rates Of Basaltic Volcanic Regions: Utilizing Space In Place Of Time In The Hawaiian Archipelago, Benjamin Clyde Barton

Theses and Dissertations

With large populations living in tropical regions of the world with volcanic substrates, understanding basalt weathering processes is vital. The Hawaiian Islands are an excellent natural analogue to study chemical weathering rates due to a uniform bedrock (basalt), large variations in rainfall, and varying ages across the islands. Laterite weathering profiles (LWP) develop over time through chemical weathering, where LWP thickness is influenced by many factors, including precipitation and time. Using the rapid, non-invasive horizontal-to-vertical spectral ratio (HVSR) method, LWP thicknesses can be estimated to constrain chemical weathering rates. Studying the laterite weathering profiles developed from basaltic bedrock of varying …

Order And Harmony: Kepler’S Guiding Forces, Dan Broadbent

Faculty Publications

Adapted from the article “Order and Harmony: Kepler’s Guiding Forces” included in “Towards Mysteries of the Cosmos with Johannes Kepler – on the 450th Anniversary of His Birth,” a commemorative volume published by the Obserwatorium Atronommiczne Krolowej Jadwigi Rzepienniku Biskupim (Queen Jadwiga Observatory of Rzepiennik Biskupi Poland) December 2021. Adapted with permission.

As the subject librarian for physics and astronomy at Brigham Young University, the author has had the privilege of handling some of Johannes Kepler’s original books preserved in the university’s archives. One of the most impressive materials in the archive is a large page from Mysterium Cosmographicum that …

Resiliency Of Utah's Road Network: A Logit-Based Approach, Max Evan Barnes

Theses and Dissertations

The Utah Department of Transportation (UDOT) manages and maintains a complex state-wide network of highways. Recent incidents such as the collapse of the I-35W bridge in Min- neapolis, Minnesota, and the I-85/Piedmont Road fire and subsequent bridge collapse in Atlanta, Georgia, have brought identification of transportation network vulnerabilities to the forefront of UDOT’s planning efforts. Traditional estimates of transportation network impacts have focused on increases to user travel time or the volume of affected traffic, but studies of these disasters have revealed that when facing a degraded transportation network, people adjust their trip making in terms of destination, mode, and …

Stochastic Modeling Of Surface Scalar-Flux Fluctuations In Turbulent Channel Flow Using One-Dimensional Turbulence, Marten Klein, Heiko Schmidt, David O. Lignell

Faculty Publications

Accurate and economical modeling of near-surface transport processes is a standing challenge for various engineering and atmospheric boundary-layer flows. In this paper, we address this challenge by utilizing an economical stochastic one-dimensional turbulence (ODT) model. ODT aims to resolve all relevant scales of a turbulent flow for a one-dimensional domain. Here ODT is applied to turbulent channel flow as stand-alone tool. The ODT domain is a wall-normal line that is aligned with the mean shear. The free model parameters are calibrated once for the turbulent velocity boundary layer at a fixed Reynolds number. After that, we use ODT to investigate …

Evaluation Of Deep Neural Network Prospr For Accurate Protein Distance Predictions On Casp14 Targets, Jacob A. Stern, Bryce Eric Hedelius, Olivia Fisher, Wendy M. Billings, Dennis Della Corte

Faculty Publications

The field of protein structure prediction has recently been revolutionized through the introduction of deep learning. The current state-of-the-art tool AlphaFold2 can predict highly accurate structures; however, it has a prohibitively long inference time for applications that require the folding of hundreds of sequences. The prediction of protein structure annotations, such as amino acid distances, can be achieved at a higher speed with existing tools, such as the ProSPr network. Here, we report on important updates to the ProSPr network, its performance in the recent Critical Assessment of Techniques for Protein Structure Prediction (CASP14) competition, and an evaluation of its …

Exploring Improvements To The Convergence Of Reconstructing Historical Destructive Earthquakes, Kameron Lightheart

Theses and Dissertations

Determining risk to human populations due to natural disasters has been a topic of interest in the STEM fields for centuries. Earthquakes and the tsunamis they cause are of particular interest due to their repetition cycles. These cycles can last hundreds of years but we have only had modern measuring instruments for the last century or so which makes analysis difficult. In this document, we explore ways to improve upon an existing method for reconstructing earthquakes from historical accounts of tsunamis. This method was designed and implemented by Jared P Whitehead's research group over the last 5 years. The issue …

Modeling User Relationships In Online Communities Of Creators, Berkeley Andrus

Theses and Dissertations

Those who study creativity, especially from a computational perspective, have long understood the role of social influence in the creative process. This has motivated many efforts to simulate social mechanics in artificial creative systems. However, these simulations have often replicated generic or assumed human behaviors rather than specific anthropological data. In this work we take a more focused approach by quantitatively measuring interactions between creators in online social communities and replicating observed phenomena in a simulated environment. The primary contributions of this thesis are 1) defining quantitative metrics for comparing human and simulated social networks of creators, 2) providing social …

Statistical Method For Extracting Radiation-Induced Multi-Cell Upsets And Anomalies In Sram-Based Fpgas, Juan Andres Perez Celis

Theses and Dissertations

FPGAs are susceptible to radiation-induced effects that change the data in the configuration memory. These effects can cause the malfunction of the system. Triple modular redundancy has extensively been used to improve the circuit's cross-section. However, TMR has shown to be particularly susceptible to radiation effects that affect more than one memory cell such as Multiple Cell Upsets (MCU) or micro-Single Event Functional Interrupts (micro-SEFI). This work describes a statistical technique to extract Multi-Cell Upset (MCU) and micro-SEFI events from raw radiation upset data. The technique uses Poisson statistics to identify patterns in the data. The most common patterns are …

Dan Shea: Celebrating Math And Music, Kendall Svengalis

Newsletter of the Jussi Björling Societies of the USA & UK

What is it about a voice that so grips a teenage boy and holds his passionate interest for the rest of his life? And not just any voice, but the voice of that most exemplary of tenors— Jussi Björling. And not just any boy, but a future founder of the Jussi Björling Society—USA: Dan Shea.

Full Issue

Newsletter of the Jussi Björling Societies of the USA & UK

No abstract provided.

Quantum Computing In Business, Quinn Peterson

Marriott Student Review

No abstract provided.

Large-Scale Reality Modeling Of A University Campus Using Combined Uav And Terrestrial Photogrammetry For Historical Preservation And Practical Use, Bryce Berrett, Cory Vernon, Haley Beckstrand, Madi Pollei, Kaleb Markert, Kevin Franke, John Hedengren

Faculty Publications

Unmanned aerial vehicles (UAV) enable detailed historical preservation of large-scale infrastructure and contribute to cultural heritage preservation, improved maintenance, public relations, and development planning. Aerial and terrestrial photo data coupled with high accuracy GPS create hyper-realistic mesh and texture models, high resolution point clouds, orthophotos, and digital elevation models (DEMs) that preserve a snapshot of history. A case study is presented of the development of a hyper-realistic 3D model that spans the complex 1.7 km2 area of the Brigham Young University campus in Provo, Utah, USA and includes over 75 significant structures. The model leverages photos obtained during the historic …

6. News Of Two Young, Singers Of Special Interest To Jbs Members

Newsletter of the Jussi Björling Societies of the USA & UK

1. We are very proud that Julia Rolwing, winner of the $500 Jussi Bjorling Prize at the 2005 Yrjo Kilpinen Society art song competition in Madison, has gone on to win First Place in the Wagnerian Voice category of the 2007 Liederkranz Foundation competition. You can see her photo in the June issue of Opera News. And just this month, the Wagner Society of New York awarded Julia its highest honor, the Robert Launch Memorial Award.

5. Leonard Warren Archive To Be Housed At Ucsb.

Newsletter of the Jussi Björling Societies of the USA & UK

It's clear that some universities are performing valuable work in maintaining archives of all kinds, perhaps more effectively than huge governmental archives like the Library of Congress. Thus we were pleased to learn from JBS-USA members Barry and Muriel Crawford that they had donated their definitive Leonard Warren Archive of recordings and memorabilia to the Performing Arts Collection at the University of California-Santa Barbara's Davidson Library.

Full Issue

Newsletter of the Jussi Björling Societies of the USA & UK

No abstract provided.

Space-Time Coded Artm Cpm For Aeronautical Mobile Telemetry, Chad Carl Josephson

Theses and Dissertations

This dissertation explores the application of Silvester's space-time block code to the multi-index CPM called "ARTM CPM" in the IRIG 106 standard to solve the "two antenna problem"---the use of two transmit antennas to provide full spatial coverage on an airborne test article and the accompanying self interference due to different delays between the two transmit antennas and the ground-based receive antenna. A symbol-level encoding scheme is derived that allows the burst-based space-time block code to operate in a continuously streaming mode. The results show that the space-time block code can solve the two antenna problem with differential delays, but …

Determining The Anthropogenic Effects On Eutrophication Of Utah Lake Since European Settlement Using Multiple Geochemical Approaches, Richard Ronald Rawle Williams

Theses and Dissertations

Recent urbanization of Utah Valley, Utah, has highlighted the impacts of anthropogenically-driven eutrophication of Utah Lake, which may lead to more frequent harmful algal blooms. To examine changes in trophic state, three freeze cores were taken from Utah Lake (Goshen Bay, Provo Bay, and near the Provo Boat Harbor) to examine the extent of eutrophication since European settlement. 210Pb and 137Cs chronologies were constructed for all three cores, although due to low supported 210Pb in the Provo Boat Harbor core, an additional pollen analysis was performed. Lower juniper pollen counts in addition to higher POACEAE (grasses and cereals) counts above …

Beware Of Ips In Sheep's Clothing: Measurement And Disclosure Of Ip Spoofing Vulnerabilities, Alden Douglas Hilton

Theses and Dissertations

Networks not employing destination-side source address validation (DSAV) expose themselves to a class of pernicious attacks which could be prevented by filtering inbound traffic purporting to originate from within the network. In this work, we survey the pervasiveness of networks vulnerable to infiltration using spoofed addresses internal to the network. We issue recursive Domain Name System (DNS) queries to a large set of known DNS servers world-wide using various spoofed-source addresses. In late 2019, we found that 49% of the autonomous systems we tested lacked DSAV. After a large-scale notification campaign run in late 2020, we repeated our measurements in …

Fourier Analysis And Other Tools For Electrical Engineers: A Practical Handbook, David G. Long

Books

No abstract provided.

Simplifying The Development Of Portable, Scalable, And Reproducible Workflows, Stephen Piccolo, Zachary E. Ence, Elizabeth C. Anderson, Jeffrey T. Chang, Andrea H. Bild

Faculty Publications

Command-line software plays a critical role in biology research. However, processes for installing and executing software differ widely. The Common Workflow Language (CWL) is a community standard that addresses this problem. Using CWL, tool developers can formally describe a tool’s inputs, outputs, and other execution details. CWL documents can include instructions for executing tools inside software containers. Accordingly, CWL tools are portable—they can be executed on diverse computers—including personal workstations, high-performance clusters, or the cloud. CWL also supports workflows, which describe dependencies among tools and using outputs from one tool as inputs to others. To date, CWL has been used …