Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

Brigham Young University

Discipline
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 631 - 660 of 8047

Full-Text Articles in Entire DC Network

What's The Password? Account Sharing In The Context Of Passwordless Authentication, Daniel Taylor Aug 2023

What's The Password? Account Sharing In The Context Of Passwordless Authentication, Daniel Taylor

Undergraduate Honors Theses

Passwordless authentication methods are becoming increasingly available for online accounts. This research asks how people will share online accounts with friends and family when there is no longer a password to share. Research participants were introduced to passwordless authentication methods and asked how they imagine the account sharing process might work. They were then introduced to four different methods of passwordless accounts, and asked to evaluate them. Sharing a link to register an additional authentication method proved to be the most popular method of account sharing.

Go to article

Cloning A Fusion Gene For The Identification Of The Proteins Contained In Ubiquitin-Rich Condensates, Grace M. Whitehead Aug 2023

Cloning A Fusion Gene For The Identification Of The Proteins Contained In Ubiquitin-Rich Condensates, Grace M. Whitehead

Undergraduate Honors Theses

Cellular liquid-liquid phase separation (LLPS) is a mechanism by which membraneless organelles such as polyubiquitinated condensates form and function. A non-receptor tyrosine kinase, Tnk1, binds to the polyubiquitin of polyubiquitinated condensates that are labeled for the proteasome for autophagy through its ubiquitin association (UBA) domain. This tyrosine kinase has links to a subset of hematological cancers, so identifying the protein contents within polyubiquitinated condensates is essential for understanding their significance in cancer pathways and to eventually identify potential therapeutic targets. This honors thesis focuses on the cloning of a fusion gene, pcDNA3.1 mNeonGreen–V5–UBA, as well as its deactivated L36D variant, …

Go to article

The Astronomy Animated Gif Lab, Darin Ragozzine Aug 2023

The Astronomy Animated Gif Lab, Darin Ragozzine

BYU Research Development Office Research Networking Conference

Astrophysics, Education

Go to article

Statistics Consulting Center, Greg Snow Aug 2023

Statistics Consulting Center, Greg Snow

BYU Research Development Office Research Networking Conference

Statistical support for any university research

Go to article

The Mything Link: Why Sacred Storytelling Is A Key Human Survival Strategy, Ken Baskin Aug 2023

The Mything Link: Why Sacred Storytelling Is A Key Human Survival Strategy, Ken Baskin

Comparative Civilizations Review

For several decades, societies across the globe have faced a real existential threat with challenges such as global warming. Yet no one in the elite has been able to do anything to improve conditions. We seem to be trapped in the kind of situation that Einstein described when he discussed problems that can’t be solved with the logic that created them.

Go to article

Buber The Radical Egalitarian And Buber And Psychology, Kenneth Feigenbaum Aug 2023

Buber The Radical Egalitarian And Buber And Psychology, Kenneth Feigenbaum

Comparative Civilizations Review

My first iteration for this paper was to present Martin Buber in the context of radical politics in Germany and to focus upon his relationship to the anarchist Gustav Landauer. After a brief search, I found too few sources that were easily accessible from here in the United States, so as part of this presentation I situate Buber in the radical politics extant mostly during his time in Germany and in Berlin. I focus here on Buber’s psychology but include several intellectual side trips visiting aspects of Buber’s philosophy and his politics. I cannot separate them in discussing Buber and …

Go to article

Practicing Mathematics Teachers' Perspectives Of Public Records In Their Classrooms, Sini Nicole White Graff Jul 2023

Practicing Mathematics Teachers' Perspectives Of Public Records In Their Classrooms, Sini Nicole White Graff

Theses and Dissertations

While media displays exist in every mathematics classroom, these displays may have been taken for granted by teachers and researchers in terms of their potential use and impact on learning. This study looks at how three practicing mathematics teachers with differing teaching styles and experience levels view and use these media displays in their classrooms. This research shows how the relationship between a teachers' perceptions of media displays for showing mathematics are closely tied to their own beliefs regarding teaching and learning. Findings for this study can provide researchers with a starting place to see how teachers perceive and talk …

Go to article

A Review On Membrane Fouling Prediction Using Artificial Neural Networks (Anns), Waad H. Abuwatfa, Nour Al Sawaftah, Naif Darwish, William G. Pitt, Ghaleb A. Husseini Jul 2023

A Review On Membrane Fouling Prediction Using Artificial Neural Networks (Anns), Waad H. Abuwatfa, Nour Al Sawaftah, Naif Darwish, William G. Pitt, Ghaleb A. Husseini

Faculty Publications

Membrane fouling is a major hurdle to effective pressure-driven membrane processes, such as microfiltration (MF), ultrafiltration (UF), nanofiltration (NF), and reverse osmosis (RO). Fouling refers to the accumulation of particles, organic and inorganic matter, and microbial cells on the membrane’s external and internal surface, which reduces the permeate flux and increases the needed transmembrane pressure. Various factors affect membrane fouling, including feed water quality, membrane characteristics, operating conditions, and cleaning protocols. Several models have been developed to predict membrane fouling in pressure-driven processes. These models can be divided into traditional empirical, mechanistic, and artificial intelligence (AI)-based models. Artificial neural networks …

Go to article

Are Shrubs A Necessary Component Of The Habitat For Ammospermophilus Nelsoni In The San Joaquin Desert?, David J. Germano, Larry R. Saslaw Jul 2023

Are Shrubs A Necessary Component Of The Habitat For Ammospermophilus Nelsoni In The San Joaquin Desert?, David J. Germano, Larry R. Saslaw

Western North American Naturalist

The San Joaquin antelope squirrel (Ammospermophilus nelsoni; SJAS) is a state-listed Threatened species in California that evolved in the shrublands of the San Joaquin Desert. Due to livestock overgrazing and fires, much of the desert has lost its shrub cover, which would be a conservation concern if shrubs are a necessary component of the habitat for squirrels. We established two 64-trap plots on the Lokern area of Kern County, California: one covered by saltbush scrub (Atriplex spp.) and another nearby without shrubs. We trapped quarterly starting in January 2019 and ending in November 2021 (12 trap sessions). …

Go to article

Heat Transfer To Rolling Or Sliding Drops On Inclined Heated Superhydrophobic Surfaces, Joseph Merkley Furner Jul 2023

Heat Transfer To Rolling Or Sliding Drops On Inclined Heated Superhydrophobic Surfaces, Joseph Merkley Furner

Theses and Dissertations

This thesis examines the time resolved heat transfer to drops rolling or sliding along inclined, subcritical heated non-wetting surfaces. Results were experimentally obtained using IR imaging for a smooth hydrophobic surface and post as well as rib structured superhydrophobic surfaces of varying solid fraction (f_s = 0.06 - 0.5). Tests were performed at varying inclination angle (α = 10, 15, 20, and 25°), drop volume (12, 20, 30, and 40 μL), and surface temperature (T_w = 50, 65, and 80 °C). Rib structured superhydrophobic surfaces were explored for drops moving parallel and perpendicular to the rib structures. The findings indicate …

Go to article

Radar Processing Techniques For Using The Limesdr Mini As A Short-Range Lfm Radar, Jacob Scott Stratford Jul 2023

Radar Processing Techniques For Using The Limesdr Mini As A Short-Range Lfm Radar, Jacob Scott Stratford

Theses and Dissertations

Drone-mounted ground penetrating radar (GPR) has the capability to investigate terrain that is inaccessible or hazardous to humans. A linear frequency-modulated (LFM) radar with the potential for GPR applications is described based on the LimeSDR Mini software defined radio (SDR). Challenges of the LimeSDR Mini radar include the SDR's lack of support for transmitter-receiver synchronization and high bleedthrough leakage. These issues are overcome through corrective software processing techniques including deconvolution of the SDR's system impulse response and digital feed-through nulling. Feed-through nulling is effective at reducing bleedthrough leakage, achieving a 26 dB reduction in power. Although high noise can confound …

Go to article

Microfabrication Of Silicon Carbide And Metallized Polymers Using A Femtosecond Laser, Joseph Taylor Eddy Jul 2023

Microfabrication Of Silicon Carbide And Metallized Polymers Using A Femtosecond Laser, Joseph Taylor Eddy

Theses and Dissertations

Femtosecond lasers deliver a high peak concentration of optical power while maintaining low average power. With an accompanying optical setup, this power can be focused and used for high-precision fabrication of metallized polymers via ablation, creating conductive structures on a thin film. These lasers can also be harnessed in tandem with hydrofluoric acid and the two-photon absorption principle to selectively etch silicon carbide, a very durable and machining-resistant semiconductor with desirable properties. This thesis presents improvements made to the Laser-Assisted Chemical Etching (LACE) technique and the ablation system. ��, the two- photon absorption coefficient of silicon carbide, is measured and …

Go to article

Ally Mediation Of Social Media Use For Adults With Autism, Spring S. Cullen Jun 2023

Ally Mediation Of Social Media Use For Adults With Autism, Spring S. Cullen

Theses and Dissertations

Previous research has highlighted the unique challenges young Autistic adults face when using social media. We extend this work by analyzing how guardians and allies, such as service providers, mediate the social media usage of young Autistic adults in order to address and mitigate online risks. Based on analysis of interview transcripts (8 young adults on the Autism spectrum, 4 parents, 10 staff members), we uncover the mediation tactics used, how they differ based on the ally's relationship with the individual, and the tactics' varying degrees of effectiveness. The findings of this research contribute to the literature by informing the …

Go to article

A Multi-Scale Method For Combined Design And Dispatch Optimization Of Nuclear Hybrid Energy Systems Including Storage, Daniel Hill, Dawson Mccrea, An Ho, Matthew Memmott, Kody Powell, John Hedengren Jun 2023

A Multi-Scale Method For Combined Design And Dispatch Optimization Of Nuclear Hybrid Energy Systems Including Storage, Daniel Hill, Dawson Mccrea, An Ho, Matthew Memmott, Kody Powell, John Hedengren

Faculty Publications

Reliable, carbon-free power generation is increasing in importance. Nuclear-renewable hybrid energy systems (NHES) are a potential solution for current generation challenges, but design and dispatch optimization for these systems remains challenging particularly when stochastic effects, long time horizons and nonlinear modeling are needed. This work presents a multi-scale method for combining the design and dispatch optimization problems for nonlinear NHES over long time horizons. Rather than treating the entire horizon as a single optimization problem, a large number of combined optimization problems are solved for shorter samples of the horizon resulting in distributions of optimal capacities for each of the …

Go to article

Friction And Heat Transfer Modeling Of The Tool And Workpiece Interface In Friction Stir Welding Of Aa 6061-T6 For Improved Simulation Accuracy, Ryan Melander Jun 2023

Friction And Heat Transfer Modeling Of The Tool And Workpiece Interface In Friction Stir Welding Of Aa 6061-T6 For Improved Simulation Accuracy, Ryan Melander

Theses and Dissertations

Friction stir welding (FSW) is a solid-state joining process that offers advantages over traditional fusion welding. The amount of heat generated during a FSW process greatly influences the final properties of the weld. The heat is generated through two main mechanisms: friction and plastic deformation, with friction being the larger contributor in a FSW process. There is a need to develop better predictive models of the heat generation and heat transfer in FSW. Almost all models seen in the literature validate temperature predictions on only one side of the tool/workpiece interface, thus ignoring possible inaccuracy that comes from incorrect partitioning …

Go to article

Extending Model Checking Using Inductive Proofs In Distributed Digital Currency Protocols, Kyle R. Storey Jun 2023

Extending Model Checking Using Inductive Proofs In Distributed Digital Currency Protocols, Kyle R. Storey

Theses and Dissertations

Model checking is an effective method to verify both safety and liveness properties in distributed systems. However, the complexity of model checking grows exponentially with the number of entities which makes it suitable only for small systems. Interactive theorem provers allow for machine-checked proofs. These proofs can include inductive reasoning which allows them to reason about an arbitrarily large number of entities. However, proving safety and liveness properties in these proofs can be difficult. This work explores how combining model checking and inductive proofs can be an effective method for formally verifying complex distributed protocols. This is demonstrated on a …

Go to article

Characterizing Dust From National Wind Erosion Research Network Sites Using Strontium Isotopes, Major And Trace Element Chemistry, And Mineralogy, Abby L. Mangum Jun 2023

Characterizing Dust From National Wind Erosion Research Network Sites Using Strontium Isotopes, Major And Trace Element Chemistry, And Mineralogy, Abby L. Mangum

Theses and Dissertations

The frequency of dust storms is increasing globally yet it is often difficult to determine dust sources in mixed events. Dust events may negatively impact human health, but the composition of major dust sources is not well characterized in arid regions globally. In the western US, the National Wind Erosion Research Network (NWERN) has various sites evaluating seasonal dust emissions to quantify dust fluxes. We used existing dust samples to characterize the isotopic, chemical, and mineralogical composition of dust over multiple seasons from ten representative NWERN sites and compared with land use, vegetation, and surficial geology. Our results show variability …

Go to article

Acoustic Directivity: Advances In Acoustic Center Localization, Measurement Optimization, Directional Modeling, And Sound Power Spectral Estimation, Samuel David Bellows Jun 2023

Acoustic Directivity: Advances In Acoustic Center Localization, Measurement Optimization, Directional Modeling, And Sound Power Spectral Estimation, Samuel David Bellows

Theses and Dissertations

Sound radiation from an acoustic source typically exhibits directional behavior, as is the case for the human voice, musical instruments, and loudspeakers, to name just a few. The necessity of directional data for many applications, such as sound source modeling, microphone placement, room acoustical design, and auralization, motivates directivity measurements. However, these measurements require careful understanding and implementation to produce the most meaningful results. Accordingly, this dissertation addresses several topics relevant to directivity theory, measurement, processing, and application. It first expands and amends previously published concepts of an acoustic source center and demonstrates the close relationship between the center and …

Go to article

Evaluating The Impact Of Math Self-Efficacy, Math Self-Concept, And Gender On Stem Enrollment And Retention In Postsecondary Education, Marcia Bingham Jun 2023

Evaluating The Impact Of Math Self-Efficacy, Math Self-Concept, And Gender On Stem Enrollment And Retention In Postsecondary Education, Marcia Bingham

Theses and Dissertations

Low enrollment and high attrition of women in science, technology, engineering, and mathematics (STEM) continues to be an issue for postsecondary institutions. Improvements in representation of women has been seen in some of the agricultural and biological sciences; however, in many of the more math intensive areas such as geosciences, engineering, mathematics/computer science, and physical sciences (GEMP), women continue to be underrepresented leading to underrepresentation in the workforce and further exacerbating gender gaps. Studies suggest the lack of representation is not due to a gap in math ability between men and women, yet underrepresentation remains predominantly within math intensive STEM …

Go to article

Ultracold Neutral Plasma Evolution In An External Magnetic Field, Chanhyun Pak Jun 2023

Ultracold Neutral Plasma Evolution In An External Magnetic Field, Chanhyun Pak

Theses and Dissertations

We study the expansion velocity and ion temperature evolution of ultracold neutral plasmas (UNPs) of calcium atoms under the influence of a uniform magnetic field that ranges up to 200 G. In the experiments, we use a magneto-optical trap (MOT) to capture the neutral atoms and laser-induced fluorescence (LIF) to take images of the plasma. We vary the magnetic field strengths and the initial electron temperatures and observe the plasma evolution in time. We compare the ion temperature evolution to the theory introduced in the paper by Pohl et. al. [Phys. Rev. A 70, 033416 (2004)]. The evolution of the …

Go to article

Reconstructing Historical Earthquake-Induced Tsunamis: Case Study Of 1852 Event Using The Adjoint Method Combined With Hmc, Chelsey Noorda Jun 2023

Reconstructing Historical Earthquake-Induced Tsunamis: Case Study Of 1852 Event Using The Adjoint Method Combined With Hmc, Chelsey Noorda

Theses and Dissertations

Seismic hazard analysis aims to estimate human risk due to natural disasters such as earthquakes. To improve seismic hazard analysis, our group is focused on earthquake induced tsunamis and the use of statistical models to reconstruct historical earthquakes. Based on the estimated wave heights given in anecdotal historical descriptions, we created observational probability distributions to model the historically recorded observations and constructed a prior distribution on the relevant earthquake parameters based on known seismicity of a given region. Then we used the software package GeoClaw, and a Metropolis-Hastings sampler to obtain a posterior distribution of earthquake parameters that most closely …

Go to article

Design, Synthesis And Immunological Testing Of Minimal Oligosaccharide Epitopes For Glycoconjugate Vaccines Targeting Capsular Polysaccharides Of Serotypes 3, 4, 7f And 9v Of Streptococcus Pneumoniae, Seth A. Taylor Jun 2023

Design, Synthesis And Immunological Testing Of Minimal Oligosaccharide Epitopes For Glycoconjugate Vaccines Targeting Capsular Polysaccharides Of Serotypes 3, 4, 7f And 9v Of Streptococcus Pneumoniae, Seth A. Taylor

Theses and Dissertations

The rise in antibiotic resistant strains of bacteria has led to the need for new methods of combatting bacterial infection. Since the surfaces of bacteria are covered in uniquely patterned capsular polysaccharides, vaccines targeting these polysaccharides have become a popular field of research for protection against pathogenic bacteria. Though licensed polysaccharide vaccines are commercially available, they lack the efficiency to protect patients that are immunocompromised or at high risk because they elicit T cell independent immune responses, resulting in low-affinity antibodies. To elicit a T cell dependent response and thereby recruit B cells that produce high-affinity antibodies, a vaccine was …

Go to article

Investigating The Use Of Translational Methods To Characterize Therapeutic Interventions In Models Of Pulmonary Disease, Ashley Rae Chang Jun 2023

Investigating The Use Of Translational Methods To Characterize Therapeutic Interventions In Models Of Pulmonary Disease, Ashley Rae Chang

Theses and Dissertations

Idiopathic Pulmonary Fibrosis (IPF) is an interstitial lung disease with no known cause or cure. IPF has an incidence of 75/1,000,000 of the population, predominately in men over the age of 60. This relatively rare disease develops in a chronic and progressive way, ultimately leading to death within two to five years of diagnosis. Our use of translatable methodologies in the bleomycin mouse model of IPF led to the novel identification of the similarities between the average percent loss of lung function in previous human clinical trials to that of our mouse model data. There is no treatment for IPF …

Go to article

Developing Microfluidic Devices For Biomolecule Analysis, Jacob Brent Nielsen Jun 2023

Developing Microfluidic Devices For Biomolecule Analysis, Jacob Brent Nielsen

Theses and Dissertations

Microfluidics can take laboratory processes and miniaturize them, which led to the term lab-on-a-chip. Microfluidic devices are fabricated with a variety of materials and methods, each offering distinct advantages for bioanalysis. This dissertation describes two methods to create these devices, with the use of four different materials to achieve different assay needs. In the first application in this dissertation, hot-embossed cyclic olefin copolymer was used to create microdevices to electrophoretically separate seven preterm birth biomarkers. One biomarker, thrombin-antithrombin III, cannot be purchased commercially so I developed methods for its assembly in the lab. Dot blots and mass spectrometry were used …

Go to article

Context Dependence Of Non-Covalent Interactions Among Amino-Acid Side Chains Along The Solvent-Exposed Surface Of Coiled Coils, Kimberlee Larsen Stern Jun 2023

Context Dependence Of Non-Covalent Interactions Among Amino-Acid Side Chains Along The Solvent-Exposed Surface Of Coiled Coils, Kimberlee Larsen Stern

Theses and Dissertations

Coiled coils are a well-known protein structure prevalent in eukaryotic function, synthetic applications, and de novo protein design. Coiled-coil folding is often described using heptad repeat positions labeled abcdefg where a and d positions occupy the interface between the coils, e and g positions flank the interface, and the b, c, and f positions face the solvent-exposed surface. The a, d, e, and g positions have been extensively studied in the coiled-coil literature. There is a lack of investigation on the impact of the b, c, and f positions on coiled-coil folding. Chapter 1 is an introduction to the heptad …

Go to article

Navigating Molecular Complexity: A Multidimensional Approach Utilizing Computational Chemistry, Jacob Andrew Parkman Jun 2023

Navigating Molecular Complexity: A Multidimensional Approach Utilizing Computational Chemistry, Jacob Andrew Parkman

Theses and Dissertations

Preparing molecular coordinate files for molecular dynamics (MD) simulations can be a very time-consuming process. Herein we present the development of a user-friendly program that drastically reduces the time required to prepare these molecular coordinate files for MD software packages such as AmberTools. Our program, known as charge atomtype naming (CAN), creates and uses a library of structures such as amino acid monomers to update the charge, atom type, and name of atoms in any molecular structure (mol2) file. We demonstrate the utility of this new program by rapidly preparing structural files for MD simulations for polypeptides ranging from small …

Go to article

Soft Contact Lens Tear Film Proteomics For Clinical Diagnostic Biomarker Discovery, Robert Kimball Roden Jun 2023

Soft Contact Lens Tear Film Proteomics For Clinical Diagnostic Biomarker Discovery, Robert Kimball Roden

Theses and Dissertations

Human tear film is an accessible biospecimen rich with useful biological information. As tear protein biomarkers for both ocular and systemic diseases have been identified in tears, efforts are being made to create point-of-care tests useful for clinical diagnoses. However, there are significant obstacles to tear diagnostics, including inadequate sampling methods and biomarkers with insufficient sensitivity and specificity. Furthermore, tear film diagnostics are particularly challenging for dry eye disease (DED) patients, where low tear volume makes sampling more difficult and the multifactorial nature of DED makes identifying the exact pathological subtype very complex. As soft contact lenses (SCLs) are designed …

Go to article

Securing Wireless Communication Via Information-Theoretic Approaches: Innovative Schemes And Code Design Techniques, Morteza Shoushtari Jun 2023

Securing Wireless Communication Via Information-Theoretic Approaches: Innovative Schemes And Code Design Techniques, Morteza Shoushtari

Theses and Dissertations

Historically, wireless communication security solutions have heavily relied on computational methods, such as cryptographic algorithms implemented in the upper layers of the network stack. Although these methods have been effective, they may not always be sufficient to address all security threats. An alternative approach for achieving secure communication is the physical layer security approach, which utilizes the physical properties of the communication channel through appropriate coding and signal processing. The goal of this Ph.D. dissertation is to leverage the foundations of information-theoretic security to develop innovative and secure schemes, as well as code design techniques, that can enhance security and …

Go to article

Exploring Surface Silanization And Characterization Of Thin Films: From Surface Passivation To Microstructural Characterization Of Porous Silicon/Silica, And Exploratory Data Analysis Of X-Ray Photoelectron Spectroscopy Images, Behnam Moeini Jun 2023

Exploring Surface Silanization And Characterization Of Thin Films: From Surface Passivation To Microstructural Characterization Of Porous Silicon/Silica, And Exploratory Data Analysis Of X-Ray Photoelectron Spectroscopy Images, Behnam Moeini

Theses and Dissertations

Surface chemistry plays a key role in science and technology because materials interact with their environments through their surfaces. Understanding surface chemistry can help alter/improve the properties of materials. However, surface characterization and modification often require multiple characterization and synthesis techniques. Silicon/silica-based materials are technologically important, so studying their surface properties can enable future advancements. In this dissertation, I explore surface modification and characterization of different types of Si/SiO2 thin films, including silicon wafers, fused silica capillary columns, and oblique angle sputtered Si/SiO2 thin films. In Chapters 2-5, I first present a method to rapidly silanize silica surfaces using a …

Go to article

Raw Diffraction Data For 1tel-Aa-Vwa (Sumo), Wwpdb Id: 7n1o, Moriah H. Mathis, Braydan D. Bezzant, Diana T. Ramírez, Supeshala D. Nawarathnage, Tzanko I. Doukov, James Moody Jun 2023

Raw Diffraction Data For 1tel-Aa-Vwa (Sumo), Wwpdb Id: 7n1o, Moriah H. Mathis, Braydan D. Bezzant, Diana T. Ramírez, Supeshala D. Nawarathnage, Tzanko I. Doukov, James Moody

ScholarsArchive Data

This X-ray diffraction dataset was collected on October 21Oct2020 at SSRL Beamline BL9-2. The crystal was of Batch 1 1TEL-AA-vWa (SUMO) The solved structure used frames 1-999 and has been deposited in the wwPDB under the PDB ID 7N1O. This data can be readily processed using XDS, AutoProc, CCP4, HKL2000/3000, or other crystallographic X-ray diffraction data processing software. The files have a human-readable header but are otherwise binary.

Go to article

First Prev Next Last