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Articles 361 - 390 of 8047
Full-Text Articles in Entire DC Network
Linking Geospatial Trends And Geochemical Fingerprints To Anthropogenic Phosphorus Dust Deposition In Subalpine Soils, Austen Michael Lambert
Linking Geospatial Trends And Geochemical Fingerprints To Anthropogenic Phosphorus Dust Deposition In Subalpine Soils, Austen Michael Lambert
Theses and Dissertations
This study shows that fugitive emissions associated with the surface mining of phosphate rock are a significant phosphorus (P) source to surface soils in northeastern Utah. Phosphorus is a nonrenewable resource essential for all life. Anthropogenic alterations to the P-cycle have led to widespread P pollution, and the unsustainable management of P has led to the threat of global depletion of P resources. Thus, accounting for both natural and anthropogenic flow paths of P is essential for the conservation and pollution reduction of P. One such source of human alteration to the P-cycle is the mining of phosphate rock. Mining, …
The Cofactor Matrix For Optimized Normal Transformations & Real-Time Caustics And Refractions Using Signed Distance Fields, Dane William Christensen
The Cofactor Matrix For Optimized Normal Transformations & Real-Time Caustics And Refractions Using Signed Distance Fields, Dane William Christensen
Theses and Dissertations
This thesis contains two distinct manuscripts both focused on real-time rendering research; an abstract for each is provided: 1. We survey methods for mapping normal vectors to a transformed surface with emphasis on the cofactor matrix form. We demonstrate that the cofactor matrix uniquely and correctly supports matrix transformations that are rank deficient or have negative determinants, while also generalizing to operations such as rotation, scaling, translation, and shearing. We derive and demonstrate the completeness of this new convention in contrast to other approaches, while also establishing its computational efficiency benefits. 2. We present SDF volumes as an efficient datastructure …
A Sensitivity Equation Framework For Parameter Estimation In Dynamical Systems, Joshua Newey
A Sensitivity Equation Framework For Parameter Estimation In Dynamical Systems, Joshua Newey
Theses and Dissertations
We present a new framework for understanding parameter estimation in dynamical systems. The approach is developed within the modeling approach of continuous data assimilation. We outline the basic assumptions that lead to our derivation. Under these assumptions we show that the parameter estimation turns into a finite dimensional nonlinear optimization problem. We show that our derivation reproduces and extends the algorithm originally developed in [9]. We then implement these methods in three example systems: the Lorenz '63 model, the two-layer Lorenz '96 model, and the Kuramoto Sivashinsky equation. So as to remain sufficiently general, our derivations are largely formal; we …
Tools For Planning Multi-Axis Vibration Qualification Tests, Marcus Edward Behling
Tools For Planning Multi-Axis Vibration Qualification Tests, Marcus Edward Behling
Theses and Dissertations
Vibration qualification testing is necessary to ensure that components will endure vibration-induced damage in flight. Multi-axis tests have shown the potential for improvement over single-axis tests, though they require increased planning. This work focuses on planning three critical aspects of these tests: the amount of operational next assembly to include in the test, the size of shakers to use, and the number of shakers to use. Next assembly selection is studied by varying the amount of next assembly included in the lab test, performing physical tests, and comparing the accuracy of environment reconstruction in each test. In doing so, a …
Pretty Good State Transfer And Fractional Revival In Double Extended Star Graphs, Kellon G. Sandall
Pretty Good State Transfer And Fractional Revival In Double Extended Star Graphs, Kellon G. Sandall
Theses and Dissertations
Much research has been done in the realm of quantum walks over networks of qubits. We primarily study a type of graph consisting of a path with two stars connected to the leaves which we call a Double Extended Star. We find that Pretty Good State Transfer can occur in many ways in a Double Extended Star and that Fractional Revival cannot occur in Double Extended Stars except when the length of the path within is one.
Exploring Co-Manipulation Via A New Decomposition Of Interaction Force And An Exploration Of Signal Space In Multi-Agent Motion Primitives, Kody Blaine Shaw
Exploring Co-Manipulation Via A New Decomposition Of Interaction Force And An Exploration Of Signal Space In Multi-Agent Motion Primitives, Kody Blaine Shaw
Theses and Dissertations
Co-manipulation is when two or more people work together to move an object. In this work, we consider the physical co-manipulation of objects that are large and heavy enough that they are more easily handled by two or more participants. We currently lack a fundamental understanding of how people perform such tasks together, both the basic signals they use to communicate and how those signals are mapped to actions and behaviors. This work builds upon the existing body of knowledge to improve our understanding of physical co-manipulation. Specifically, interaction forces are often considered a key method for information transfer in …
Extreme Ultraviolet And Xray Applications Of Carbon Nanotube Devices, Scott Olsen
Extreme Ultraviolet And Xray Applications Of Carbon Nanotube Devices, Scott Olsen
Theses and Dissertations
The vacuum ultraviolet (VUV), extreme ultraviolet (EUV) and xray ranges of the electromagnetic spectrum have many unique properties and applications, such as medical treatment, photolithography, and astronomical observation. However, these applications require unique optical element designs, setups, and materials. carbon nanotubes (CNTs) are a fascinating material with thermal, mechanical, and chemical properties that may be beneficial for VUV, EUV, and xray applications. They are conductive, can be patterned into high aspect ratio structures, and are stable in high temperature vacuum. In this work, we report several carbon nanotube devices developed for the VUV, EUV, and xray range. These devices include …
Geological And Geophysical Model Of The Sand Wash Extensional Decollement, Utah, Brigham Louis Cardon
Geological And Geophysical Model Of The Sand Wash Extensional Decollement, Utah, Brigham Louis Cardon
Theses and Dissertations
The Sand Wash Fault Zone (SWFZ) in the southern Uinta Basin is a significant extensional fault zone exhibiting complex deformation patterns. Our study integrates detailed structural analyses with a broader tectonic model to elucidate the tectonic evolution of the region. The SWFZ, extending over 34 km with a NW-SE strike, is underlain by an extensional decollement. Substantial deformation is observed in the upper layers, notably within the S2 sandstone of the Eocene Green River Formation. The deformation diminishes with depth, terminating at the oil-rich Mahogany oil shale zone, below which minimal deformation is observed. Our tectonic model, developed primarily through …
Engineering Cell-Free Protein Synthesis Biosensors For Point Of Care Use, Tyler Jordan Free
Engineering Cell-Free Protein Synthesis Biosensors For Point Of Care Use, Tyler Jordan Free
Theses and Dissertations
Diagnostic tests can dramatically improve and save lives. Survival rates and patient outcomes related to cancer and other diseases can be improved when routine testing guides personalized treatment. Highly accurate laboratory tests exist for thousands of biomarkers, including those of interest in this dissertation, but cost and complexity limit access to life-saving lab tests in many cases throughout the world. To fill this need and increase accessibility of diagnostics, in this report we report our engineering advancements towards portable biosensors for colorimetric detection of glutamine, endocrine disrupting compounds (EDC), and pathogenic RNA which are key biomarkers in cancer treatment monitoring, …
Systematic Review Of Digital Activity Schedule Use In Individuals With Autism And Intellectual Disability, Adelaide Wahlquist Hammond
Systematic Review Of Digital Activity Schedule Use In Individuals With Autism And Intellectual Disability, Adelaide Wahlquist Hammond
Theses and Dissertations
The purpose of this systematic review of using digital activity schedules as an intervention in individuals with autism spectrum disorder and intellectual disabilities is to determine to what extent the current research shows it to be an effective intervention. For articles to be included in this review, they had to use a digitally presented activity schedule, the activity schedule could not be a task analysis of a single activity or a group visual schedule, and the intervention must have been carried out with individuals with autism or intellectual disabilities. Studies meeting the inclusion criteria totaled 17 studies with a total …
Using Neural Networks To Reconstruct Temperature From Fluorescent Data For Use In Bio-Microfluidics, Jacob G. Kullberg
Using Neural Networks To Reconstruct Temperature From Fluorescent Data For Use In Bio-Microfluidics, Jacob G. Kullberg
Theses and Dissertations
It has been theorized that Quantum Dots (QD) can solve the temperature sensor issue with microfluidic devices. Quantum Dots are nano-sized semiconducting crystals with a radius of an excited electron-hole pair. When a QD is excited by a short wavelength light, the QD produces fluorescent light. As the temperature of the dot changes, the dot expands and shifts the fluorescent spectrum. Quantum Dots are small enough to be placed inside the microfluidic devices, and a spectrometer can measure the change in fluorescent data. This fluorescent data can be used to create fluorescent images corresponding to the QD temperature. These fluorescent …
Real-Time Dynamically Feasible B-Spline Trajectory Generation For Unmanned Aircraft, David Lavae Christensen
Real-Time Dynamically Feasible B-Spline Trajectory Generation For Unmanned Aircraft, David Lavae Christensen
Theses and Dissertations
Onboard aircraft systems must frequently plan dynamically feasible paths or trajectories to safely and quickly reach their goal position. Optimized B-splines are promising because they can guarantee kinematic feasibility in a computationally efficient manner and can be applied to a variety of vehicle models. However, current B-spline solutions do not adequately constrain trajectories to the physical limitation of the vehicles they are planning for, or are often too conservative. Most are also limited to path smoothing or require pre-optimized timing parameters. This thesis develops a real-time B-spline optimization-based trajectory generator capable of minimizing time while respecting the velocity, acceleration, and …
Cellular Sorting Of The Dictyostelium Discoideum Slug, Erin Flowerday
Cellular Sorting Of The Dictyostelium Discoideum Slug, Erin Flowerday
Theses and Dissertations
Dictyostelium discoideum (Dd) cells are amoeba cells that feed on soil or plant leaf matter bacteria. They divide freely in the presence of food. When starved, cell division is ended, and cells transition from unicellular to multicellular organisms initiated by a chemoattractant, cyclic adenosine monophosphate (cAMP). This study intricately examines cellular sorting within the Dd slug, focusing on individual cell dynamics. Represented as oriented ellipsoids, these cells maintain constant volume through a viscoelastic structure. Applying force to specific semi-axes reveals predictable deformations, highlighting the relationship between force and deformation rate. Manipulating damping coefficients and spring constants uncovers insights into cell …
Investigating Cloth Sculpting For Simulation Control In Virtual Reality, Matthew S. Bishop
Investigating Cloth Sculpting For Simulation Control In Virtual Reality, Matthew S. Bishop
Theses and Dissertations
Artists require control and predictability over physically based simulations to create their required animation. This control can lead to reduced iteration time to get the desired simulation results. Controlling cloth simulations can require manual effort to create goal keyframes for control algorithms to match. Current techniques and research utilize a keyboard and mouse to create these goal keyframes. Other research has looked at using a virtual reality (VR) head-mounted display with controllers to improve the experience of completing similar animation tasks. However, we are not aware of any research that attempts to use VR as a tool to assist artists …
Vco Calibration Techniques And Design Of A 0.12-V Ultra-Low Supply Analog-To-Digital Converter, Shea Smith
Vco Calibration Techniques And Design Of A 0.12-V Ultra-Low Supply Analog-To-Digital Converter, Shea Smith
Theses and Dissertations
Many analog-to-digital converters (ADC) quantize inputs using a voltage-controlled-oscillator (VCO). These VCO-based ADCs leverage time-domain processing to shape quantization noise and mismatch, which further increases their appeal. Despite these advantages, achieving good performance with a VCO-based ADC remains a significant challenge due to the nonlinear transfer characteristics of the voltage-to-frequency (V-F) conversion. VCO-based ADCs widely utilize coarse-fine readout to save power and hardware compared to counter-only converters. However, the timing mismatch due to the clock skew between the coarse and fine quantizers can lead to significant reconstruction errors. Chapter 2 proposes a digital calibration circuit to detect and correct coarse-fine …
Subspace Decomposition Of Linear Secrecy Codes, David Robert Joseph Hunn
Subspace Decomposition Of Linear Secrecy Codes, David Robert Joseph Hunn
Theses and Dissertations
We introduce a new method for the study of linear codes, termed subspace decomposition, which provides new insights into code structure and performance. Briefly, subspace decomposition comprises the evaluation of complex properties of a linear code by evaluating simple properties of its constituent subspaces. We find that this technique has application to a number of problems in coding theory. When applied to the problem of evaluating the performance of secrecy codes, subspace decomposition provides an efficient method for computing the equivocation of coset codes over the binary erasure wiretap channel. It is also especially efficient in computing the chi squared …
Developing A Fusion Energy Science And Technology Ecosystem, Richard Sandberg
Developing A Fusion Energy Science And Technology Ecosystem, Richard Sandberg
BYU Research Development Office Research Networking Conference
Areas of Interest: Fusion Energy, X-ray imaging, ultrafast optics, computational imaging, inverse and optimization problems, communication, social media campaigns, database development, scientific outreach, educational material development
Yoga And Christ Centered Learning, Veronique W. Merritt
Yoga And Christ Centered Learning, Veronique W. Merritt
BYU Research Development Office Research Networking Conference
The effects of yoga upon academic success: increased movement builds strength, neuroplasticity; increased brain blood perfusion improves cognition; regular low impact movement reduces injury; increased movement improves oxygenation
Structural Characterization Via Ion Mobility-Mass Spectrometry, Kenny Lee
Structural Characterization Via Ion Mobility-Mass Spectrometry, Kenny Lee
BYU Research Development Office Research Networking Conference
Areas of Interest: Structural biology, Isomer/conformer characterization, Gas-phase ion chemistry
Finding Therapeutic Targets From Big (Biological) Data, Brett E. Pickett
Finding Therapeutic Targets From Big (Biological) Data, Brett E. Pickett
BYU Research Development Office Research Networking Conference
Areas of Interest: Cancer, Infections, RNAseq, Disease, Treatments, Diagnostics
Greg Snow Research Interests, Greg Snow
Greg Snow Research Interests, Greg Snow
BYU Research Development Office Research Networking Conference
Areas of Interest: Statistical support for any University Research
Automated Classification Of Extended Astrophysical Objects Using Ai Techniques, Aleksandr Mosenkov
Automated Classification Of Extended Astrophysical Objects Using Ai Techniques, Aleksandr Mosenkov
BYU Research Development Office Research Networking Conference
Areas of Interest: Extragalactic astronomy, AI methods, Computer Science
Advancing Understanding And Support For Families Experiencing Chronic Illness And Disability, Christine Platt
Advancing Understanding And Support For Families Experiencing Chronic Illness And Disability, Christine Platt
BYU Research Development Office Research Networking Conference
Areas of Interest: Health of children and families, families raising children with chronic illnesses and disabilities, social determinant of health, foster care system
Comparing Gas Composition From Fast Pyrolysis Of Live Foliage Measured In Bench-Scale And Fire-Scale Experiments, David R. Weise, Thomas H. Fletcher, Timothy J. Johnson, Wei Min Hao, Mark Dietenberger, Marko Princevac, Bret W. Butler, Sara S. Mcallister, Joseph J. O'Brien, E Louise Loudermilk, Roger D. Ottmar, Andrew T. Hudak, Akira Kato, Babak Shotorban, Shankar Mahalingham, Tanya L. Myers, Javier Palarea-Albaladejo, Stephen P. Baker
Comparing Gas Composition From Fast Pyrolysis Of Live Foliage Measured In Bench-Scale And Fire-Scale Experiments, David R. Weise, Thomas H. Fletcher, Timothy J. Johnson, Wei Min Hao, Mark Dietenberger, Marko Princevac, Bret W. Butler, Sara S. Mcallister, Joseph J. O'Brien, E Louise Loudermilk, Roger D. Ottmar, Andrew T. Hudak, Akira Kato, Babak Shotorban, Shankar Mahalingham, Tanya L. Myers, Javier Palarea-Albaladejo, Stephen P. Baker
Faculty Publications
Background. Fire models have used pyrolysis data from oxidising and non-oxidising environments for flaming combustion. In wildland fires pyrolysis, flaming and smouldering combustion typically occur in an oxidising environment (the atmosphere). Aims. Using compositional data analysis methods, determine if the composition of pyrolysis gases measured in non-oxidising and ambient (oxidising) atmospheric conditions were similar. Methods. Permanent gases and tars were measured in a fuel-rich (non-oxidising) environment in a flat flame burner (FFB). Permanent and light hydrocarbon gases were measured for the same fuels heated by a fire flame in ambient atmospheric conditions (oxidising environment). Log-ratio balances of the measured gases …
Optimization Of Mass Spectrometry-Based Methods For Low-Input And Spatial Proteomics, Andikan Jones Nwosu
Optimization Of Mass Spectrometry-Based Methods For Low-Input And Spatial Proteomics, Andikan Jones Nwosu
Theses and Dissertations
Eukaryotic cells are highly heterogeneous. These cells are arranged into different compartments, carrying out separate functions and facilitating biological processes. Proteins are the effector biomolecules targeted to subcellular locations that help fulfill specific tasks in living organisms. Spatial proteomics can help unravel molecularly how protein abundance and localization are altered in cells, which is not feasible in traditional bulk-scale proteomics. To achieve this, our lab has developed a miniaturized sample processing platform called nanoPOTS, reduced separation columns' inner diameter to increase ionization efficiency and concentrate analytes for mass spectrometers and optimized data acquisition modes for increasing proteome coverage in spatial …
Striking At The Root: A Categorization Of Dns Clients, Tyler Dean
Striking At The Root: A Categorization Of Dns Clients, Tyler Dean
Theses and Dissertations
The Domain Name System (DNS) root servers have provided a useful look into the DNS and internet ecosystems for decades. We present a categorization of clients querying DNS root servers. Using two clustering algorithms on DNS traffic sampled in 2020, we can predict the structure and volume of queries originating from different types of clients. Previous research has used unsupervised techniques to better understand DNS traffic patterns, but none have, to our knowledge, considered clients beyond those driven by queries from end users. By performing clustering on IP addresses rather than on individual queries, we are able to examine the …
Adding A Teacher Dashboard To A Functioning Web App, Melanie Jensen
Adding A Teacher Dashboard To A Functioning Web App, Melanie Jensen
Instructional Psychology and Technology Graduate Student Projects
A teacher dashboard was added to an existing web-based application that teaches math-fact fluency. The author describes the process of analysis, design, development, and implementation. Challenges faced at each stage are described, and design decisions are discussed.
Strong Gelfand Pairs Of Some Finite Groups, Joseph E. Marrow
Strong Gelfand Pairs Of Some Finite Groups, Joseph E. Marrow
Theses and Dissertations
Strong Gelfand pairs describe a relation between a group and a subgroup, using a relation between inner products of their characters. We find all strong Gelfand pairs of the dihedral and dicyclic groups, and several of the sporadic groups. We provide some results for the strong Gelfand pairs of the affine linear groups, in addition to the exceptional classical groups $\mathrm{Sp}_4(q)$ for $q$ a power of $2$.
Information Geometric Approaches To Optimal Experimental Design And Reduced-Order Modeling In Ocean Acoustics, Jay C. Spendlove
Information Geometric Approaches To Optimal Experimental Design And Reduced-Order Modeling In Ocean Acoustics, Jay C. Spendlove
Theses and Dissertations
This thesis demonstrates the application of information geometry to problems in underwater acoustics. Information geometry combines the fields of information theory and differential geometry by interpreting a multiparameter model as a Riemannian manifold in an ambient data space. Information geometry tools are especially powerful in context of problems of experimental design and model selection in ocean acoustics. The application area specifically considered in this research is geoacoustic inversion, where seabed parameter values are inferred from acoustical data. Chapter 2 contains a paper submitted to the Journal of Theoretical and Computational Acoustics, which introduces information geometry tools such as the model …
Documentation Of Norm Negotiation In A Secondary Mathematics Classroom, Michelle R. Bagley
Documentation Of Norm Negotiation In A Secondary Mathematics Classroom, Michelle R. Bagley
Theses and Dissertations
While previous mathematics education research has shown that norms can change in mathematics classrooms, little research has closely documented the struggles, concessions, and compromises involved in the negotiation process. Negotiating norms is a complex process entailing deliberate teacher moves intended to promote norms, often met with misunderstandings or resistance from students. This thesis documented the negotiation process that occurred when a teacher attempted to require conceptual explanations from students who had not previously been accustomed to doing so. I recorded six days of instruction in a 9th grade algebra unit, transcribed the class discussions, and inferred norms "at play" for …