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Articles 1771 - 1800 of 69419
Full-Text Articles in Engineering
Augmented State Linear Covariance Applications For Nonlinear Missile Engagements, Jeffrey Scott Clawson
Augmented State Linear Covariance Applications For Nonlinear Missile Engagements, Jeffrey Scott Clawson
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Sustained actuator saturation is a common occurrence for missile engagements. The saturation nonlinearity creates some difficulty for high-fidelity linear analysis methods. This dissertation investigates three methods of modeling actuator saturation in an advanced linear analysis. The linear covariance tools from this dissertation run extremely fast and provide several advantages over other linear missile engagement analysis methods. First, a simulation is developed and validated for a target engagement scenario without actuator saturation. Next, saturations are introduced to the problem, along with the first analysis method: statistical linear covariance analysis. This method combines the augmented state linear covariance framework with the statistical …
Groundwater-Surface Water Interaction To Increase Groundwater Availability, Saeid Masoudiashtiani
Groundwater-Surface Water Interaction To Increase Groundwater Availability, Saeid Masoudiashtiani
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
This study develops procedures for using surface water to increase groundwater availability and sustainable yield, and for evaluating impacts on surface water. Increasing sustainable groundwater yield requires reducing the gap between the volumes of discharge from versus recharge to an aquifer. The study presents procedure for water user(s) to help increase groundwater availability. Toward that end, this study simulates and evaluates: a) aquifer storage and recovery (ASR) of water diverted from Red Butte Creek in Salt Lake Valley, Utah for subsequent turf irrigation; b) ASR injection of residential runoff from daily rainfall for subsequent extraction to irrigate turf; and c) …
Aerodynamic Implications Of A Bio‐Inspired Rotating Empennage Design For Control Of A Fighter Aircraft, Christian R. Bolander
Aerodynamic Implications Of A Bio‐Inspired Rotating Empennage Design For Control Of A Fighter Aircraft, Christian R. Bolander
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
This dissertation presents an analysis of the aerodynamics for an aircraft using a novel, bio-inspired control system. The control system is a rotating tail, that is inspired by the way in which birds use their tail to control their flight. An aerodynamic model for a baseline aircraft and a bio-inspired variant are created by referencing well-known relationships for the aerodynamics of flight, which are then used to analyze the available flight envelope at which each aircraft can reach two different equilibrium states. An analysis of the total aerodynamic control authority of each aircraft is also included along with a preliminary …
Probabilistic Verification For Modular Network-On-Chip Systems, Jonah W. Boe
Probabilistic Verification For Modular Network-On-Chip Systems, Jonah W. Boe
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Modeling physical systems with formal analysis tools can help in the design of more fault-proof systems, by helping to determine if unpredictable or unwanted behavior may occur. Probabilistic verification further advances such processes, by providing quantitative information about the system. More complex systems can especially benefit from formal modeling and verification, as testing the physical system in every possible condition manually, can be extremely complex, and often impossible.
There is a growing interest in the application of Network-on-Chip (NoC) systems. NoCs can help simplify communication between the subsystems of many technologies, including the ever more complex multicore processors being produced. …
Dynamic Inductive Power Transfer Systems With Reflexive Tuning Networks Designed By Machine Learning, Shuntaro Inoue
Dynamic Inductive Power Transfer Systems With Reflexive Tuning Networks Designed By Machine Learning, Shuntaro Inoue
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
This dissertation proposes a new way to make dynamic wireless charging systems more affordable. Instead of using one inverter for each transmitter coil, as is typically done, the proposed system uses a single inverter that is connected to multiple transmitter coils. This approach is made possible by reflexive tuning, which allows for high currents to be achieved only on the transmitter coil in use. The system was tested with a 50kW prototype, designed using a combination of neural networks and genetic algorithms. The prototype was tested on both automated rail and vehicle systems. The measured dc-dc efficiency with single and …
Communication‐Less Synchronous Rectification For In Motion Wireless Charging, Joshua B. Larsen
Communication‐Less Synchronous Rectification For In Motion Wireless Charging, Joshua B. Larsen
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
This thesis puts forward a control scheme to allow for synchronous rectification for dynamic wireless power transfer. The automotive industry is transitioning away from internal combustion engines (ICEs) and towards electric vehicles (EVs). This transition is spurred by the environmental and economic benefits EVs offer over ICEs. However, further improvements can still be made to how electric vehicles operate. One of these improvements is the technology of in motion wireless charging or dynamic wireless power transfer. In motion wireless charging offers the ability to remove existing range anxiety concerns for EVs. It also offers the potential for a reduction in …
A Questionnaire Survey Of Student Engagement Among First-Generation College Students In Engineering, Abigail Lehto
A Questionnaire Survey Of Student Engagement Among First-Generation College Students In Engineering, Abigail Lehto
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
First-generation college (FGC) students are defined as students whose parents do not have a bachelor's or graduate degree. FGC students tend to face more overall challenges in the college environment than their continuing-generation counterparts. Often, FGC students have lower grade-point-averages (GPAs) and are less likely to graduate than their peers. In majors like engineering, the struggles that first-generation college students face can be further magnified. This quantitative study examines the activities FGC students in engineering engage in based on the National Survey of Student Engagement (NSSE). Questions from the NSSE cover different educational activities and are categorized into ten educational …
High Efficiency Angles-Only Space-Based Approaches For Geosynchronous Orbit Catalog Maintenance With Sparse Information, Louis M. Tonc
High Efficiency Angles-Only Space-Based Approaches For Geosynchronous Orbit Catalog Maintenance With Sparse Information, Louis M. Tonc
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
The thesis of this dissertation proposes a novel filter algorithm to improve tracking and catalog maintenance of uncooperative satellites and other Resident Space Objects (RSOs) in Geosynchronous Equatorial Orbit (GEO). Tracking can be supported by space-based tracking from observer satellites (OBSs). Practical limitations can lead to long time gaps between measurement updates when tracking RSOs from an OBS, which may induce a loss of fidelity or divergence of the estimation algorithm. The Extended Kalman filter (EKF) is commonly used for tracking RSOs but it diverges as a consequence of nonlinearity in the dynamics and nonlinearity in the optical measurements from …
Estimating Seasonal Crop Water Consumption In Irrigated Lands Using Soil Moisture And Reference Evapotranspiration, Oliver Henry Hargreaves
Estimating Seasonal Crop Water Consumption In Irrigated Lands Using Soil Moisture And Reference Evapotranspiration, Oliver Henry Hargreaves
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
The increase in population and the megadrought that the American west has been experiencing for the past two decades and for the foreseeable future are the cause of great stress on the region’s water resources. In an effort to mitigate the worst effects of water shortages many public and private agencies have been pursuing ways to reduce water use while maintaining the current status quo of living standards, industrial productivity, and agricultural yield. This project aims to study water use in irrigated lands dedicated to agriculture with the objective of quantifying crop water use, often referred to as evapotranspiration (ET), …
Improved Sustainability And Efficiency Of Partial Depth Concrete Bridge Deck Repair, Israi I. H. Abu Shanab
Improved Sustainability And Efficiency Of Partial Depth Concrete Bridge Deck Repair, Israi I. H. Abu Shanab
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Recently, significant advances have been made in the development of rapid setting cementitious materials for partial depth bridge deck repair. The rapid set times of these materials allow for traffic to be re-opened onto the bridge deck in several hours versus days once the material has been placed. While this is a substantial improvement in reducing the traffic closure time, a large amount of time is still spent on the removal of damaged and deteriorated bridge deck and in preparing the concrete cutouts for placement of the rapid set material. Partial deck removal is a much more delicate process than …
Comparing 1d, 2d, And 3d Hydraulic Models In Urban Flooding Applications, Taylor Kesler
Comparing 1d, 2d, And 3d Hydraulic Models In Urban Flooding Applications, Taylor Kesler
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Floods have been a hazard to people since people first started building near rivers. Predicting floods can be very beneficial to save lives and property. Computers have made it possible to solve fluid dynamics equations in a fast and efficient manner. Computer programs have been designed to solve these equations and create digital models of floods.
This study compares three different methods of computer modeling and explores their advantages and disadvantages. One-dimensional models solve fluid equations by setting up a series of cross sections. Two-dimensional models use a grid-like mesh to solve fluid equations from one cell to the next. …
The Active Cryocubesat Technology: Active Thermal Control For Small Satellites, Lucas S. Anderson
The Active Cryocubesat Technology: Active Thermal Control For Small Satellites, Lucas S. Anderson
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Modern CubeSats and Small Satellites have advanced in capability to tackle science and technology missions that would usually be reserved for more traditional, large satellites. However, this rapid growth in capability is only possible through the fast-to-production, low-cost, and advanced technology approach used by modern small satellite engineers. Advanced technologies in power generation, energy storage, and high-power density electronics have naturally led to a thermal bottleneck, where CubeSats and Small Satellites can generate more power than they can easily reject. The Active CryoCubeSat (ACCS) is an advanced active thermal control technology (ATC) for Small Satellites and CubeSats, which hopes to …
Laboratory Modelling Of The Various Components Of Backward Erosion Piping Behavior Due To Converging Flow With Different Constricted Outlets, Ibrahim Ahmed Abdelmotelb Ibrahim
Laboratory Modelling Of The Various Components Of Backward Erosion Piping Behavior Due To Converging Flow With Different Constricted Outlets, Ibrahim Ahmed Abdelmotelb Ibrahim
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Backward Erosion Piping (BEP) is an internal erosion mechanism which occurs at the down stream of dams or levees. Two conditions needed for this failure to occur: 1) head of water in the upstream of the dam or the levee to drive the seepage forces, and 2) crack in the roof or the blanket layer of the cohesionless material in the downstream of the dam or a levee. Numerous researches were performed in the past in an attempt to predict the critical gradient for BEP to initiate. Some researches are too conservative and other researches are under predicting the critical …
Physical Model Of Rainwater Along Roadway Filter Strip, Ryan C. Eberhard
Physical Model Of Rainwater Along Roadway Filter Strip, Ryan C. Eberhard
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
The purpose of this research was to investigate infiltration rates of rainwater into a roadside filter strip. The findings of this study were intended to be used by the Utah Department of Transportation in their design of stormwater retention. A testing apparatus was designed and constructed to simulate rainfall and infiltration on an inclined slope during the 80th percentile 24-hour rainstorm event in Utah. The model was used to test six different surface soil configurations at three slope inclinations. Each test was subjected to a simulated storm event of ½ inch of rain over a 2-hour period. The variation …
Locating Low Head Dams Using A Deep Learning Model In Arcgis Pro With Aerial Imagery, Caitlin R. Arnold
Locating Low Head Dams Using A Deep Learning Model In Arcgis Pro With Aerial Imagery, Caitlin R. Arnold
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Low Head Dams are man-made structures that span the width of a river and allow water to flow over them. Although these structures vary in age and original purpose, some pose a life-threatening danger when recreationalists are entrapped in the reverse current at the toe. Despite these dangerous structures causing many drowning deaths in the USA each year, most low head dams do not have safety regulations and remain unknown to those charged with dam and public safety. Thus, to improve public safety at these structures, the first step is to fully inventory low head dams, so that subsequent efforts …
Metastability And Degradation In Cu(In,Ga)Se2 Thin-Film Solar Cells, Mohsen Jahandardoost
Metastability And Degradation In Cu(In,Ga)Se2 Thin-Film Solar Cells, Mohsen Jahandardoost
UNLV Theses, Dissertations, Professional Papers, and Capstones
Cu(In,Ga)(S,Se)2 or CIGS is a thin-film semiconductor that has shown a device efficiency of 23.35% and 24.2% for single-junction and perovskite/CIGS tandem solar cells, respectively. CIGS offers promising properties such as tunable bandgap and ease of processing making them great candidates for thin-film tandem devices. However, knowledge of the effect of material defects, buffer materials, and post-deposition treatment (PDT) on degradation and metastability behavior in these devices is not well understood.In this dissertation, metastability and long-term degradation of CIGS thin-film solar cells have been investigated under combinatorial stress factors of heat, light, and voltage bias to systematically understand the effect …
Probing The Structure Of Water On Surfaces: From Water Absorption To Ice Nucleation, Jiarun Zhou
Probing The Structure Of Water On Surfaces: From Water Absorption To Ice Nucleation, Jiarun Zhou
All Dissertations
Water, essential for all life forms, is the most abundant, simple, yet mysterious molecule in the world. This molecule, consisting of only three atoms, behaves in unexpectedly different ways with the change of environment. In the past, studies of water under different conditions (temperature, pressure, on the surfaces, with confinement) have been conducted using experimental and computational methods. However, the influence of a given environment on water properties is yet to be fully understood. This dissertation studies water at complex interfaces (surfaces with various chemistry and physics properties) in both the liquid and crystalline states. Various heterogeneous systems used to …
Evaluation Of Dual Band J-Pole Antennas To Serve Drone-Mountable Ham Radio Repeater, Jeremiah Wimer
Evaluation Of Dual Band J-Pole Antennas To Serve Drone-Mountable Ham Radio Repeater, Jeremiah Wimer
Electrical Engineering Undergraduate Honors Theses
The portable “roll-up” Dual-Band J-pole antenna model (commonly referred to as DBJ-2) is found to be the most favorable J-pole antenna design for serving a drone-mountable ham radio repeater. In addition to being light in weight, inexpensive to construct, and weather-resilient, the DBJ-2 offers the greatest Standing Wave Ratio (SWR) in the Very High Frequency (VHF) and Ultra High Frequency (UHF) bands compared to the other J-pole antenna designs evaluated. Enclosed is a brief overview of antenna design theory, as well as an exploration of various other J-pole antenna designs, and a clear rationale for selecting the DBJ-2 antenna design …
Formulation And Optimization Of Algae-Filled Polylactic Acid Thermoplastic Compounds For Improved Biodegradation, Sydney A. Cole
Formulation And Optimization Of Algae-Filled Polylactic Acid Thermoplastic Compounds For Improved Biodegradation, Sydney A. Cole
Honors Theses
Conventional plastics derived from non-renewable petrochemicals – especially from fossil reserves – have become an integral part of human life because their structure can be chemically manipulated to obtain a wide range of properties and geometries necessary in nearly all industries. The volume and rate at which petroleum plastics are produced, used, and discarded has incited several significant issues related to human health, environmental conservation, and ecological biodiversity. To address these issues, many institutions have begun investigating solutions in both the development and end-oflife phases of plastic production and waste. In this thesis, a Chlorella-dominated algae mixture is dried and …
Structure-Property-Processing Analysis Of Graphene Bioscaffolds For Viability And Differentiation Of C2c12 Cells, Lynn Karriem
Structure-Property-Processing Analysis Of Graphene Bioscaffolds For Viability And Differentiation Of C2c12 Cells, Lynn Karriem
Boise State University Theses and Dissertations
We investigated the structure – property – processing correlation of graphene bioscaffolds produced using three different methods. Bioscaffolds were prepared by chemical vapor deposition (CVD), sublimation of Silicon Carbide (SiC), and printed solvent assisted exfoliated graphene ink. To gain insight into the roughness and topography of graphene, AFM was performed on each bioscaffold. Raman spectroscopy mapping demonstrated differences in the I2D/IG ratio for each scaffold. Young’s modulus was determined by nanoindentation and indicated that epitaxial graphene had the highest average stiffness, followed by CVD, with printed graphene demonstrating the lowest average stiffness. To investigate the biocompatibility of …
Xanthan Gum Isolation Alternative Via Ultrafiltration, Anna Beth Malone, Jeffrey Greer, Lareesa Thomas, Lucy Moore
Xanthan Gum Isolation Alternative Via Ultrafiltration, Anna Beth Malone, Jeffrey Greer, Lareesa Thomas, Lucy Moore
Chancellor’s Honors Program Projects
No abstract provided.
Photocatalytic Nanoparticle Treatment Of Cyanotoxins In Harmful Algal Blooms, Brian Baird
Photocatalytic Nanoparticle Treatment Of Cyanotoxins In Harmful Algal Blooms, Brian Baird
Civil Engineering Undergraduate Honors Theses
Harmful Algal Blooms (HAB) have the ability to cause detriment to water bodies, ecosystems, and human health. Furthermore, current evidence suggests that these events are becoming increasingly common due to factors such as increased pollution and global warming. While there are current methods to treat water that is negatively impacted by the bacteria and toxins associated with HABs, these methods are often costly and inefficient. The purpose of this research is to explore a potential treatment option that uses titanium dioxide photocatalytic nanoparticles attached to a retractable net to treat toxins produced by HABs in situ. Specifically, the toxin …
Understanding The Bond Strength Of Bcsa Cement Repair Concrete To Portland Cement Concrete, Brenden Simmons
Understanding The Bond Strength Of Bcsa Cement Repair Concrete To Portland Cement Concrete, Brenden Simmons
Civil Engineering Undergraduate Honors Theses
Concrete structures deteriorate over time, and there is an increasing demand for quick repair solutions. Belitic calcium sulfoaluminate (BCSA) cement, a type of rapid setting cement, is thought to be a more sustainable and convenient alternative to portland cement in repair concrete applications. Indicated by the name, rapid setting concrete can set up quicker than traditional portland cement concrete. Because of this, there has been a lot of research about the properties of rapid setting concrete mixes. One of the most popular topics is the strength of the concrete itself. However, there is a need for more research to understand …
Lignin Copolymer Property Prediction Using Machine Learning, Collin Larsen
Lignin Copolymer Property Prediction Using Machine Learning, Collin Larsen
Chemical Engineering Undergraduate Honors Theses
Lignin, an abundant biopolymer, is a waste byproduct of the paper and pulp industry. Despite its renewable nature and potential applicability in various products, such as plastics and composites, the development of lignin-based materials has been impeded by the cumbersome, Edisonian process of trial and error. This research proposes a novel approach to forecasting the properties of lignin-based copolymers by utilizing a recurrent neural network (RNN) based on the Keras models previously created by Tao et al. Example units of modified lignin were synthesized via esterification and amination functional group modifications. To increase the efficiency and accuracy of the prediction …
Comparing Firocoxib And Meloxicam In The Application Of Microneedle Patch For Transdermal Drug Delivery, Ruohan Li
Chemical Engineering Undergraduate Honors Theses
This thesis compares the performance of meloxicam and firocoxib in the aspects of its physical characteristic, chemical compositions, and in-vitro performances for transdermal pain management microneedle patches on farm animals. The microneedle patches are composed of polyvinyl alcohol (PVA), type I collagen (COL), and chitosan (CHI) as base material that carries NSAIDs to achieve therapeutic purposes. Scanning electron microscopy (SEM) was utilized to observe the morphological and physical characteristics of the microneedle patches. Both meloxicam and firocoxib microneedle patches were successfully prepared using the methodology, with organized microneedle distribution and sizing. And Fourier transform infrared spectroscopy (FTIR) confirmed the chemical …
The Effects Of Social Media On Mental Health And Career Planning, Spencer A. Rowan
The Effects Of Social Media On Mental Health And Career Planning, Spencer A. Rowan
Honors Theses
Social media use is prevalent and necessary in society—nearly anything can be accomplished with a mobile device or smartphone. Among the US population, two thirds of American adults admit to using social media (Perrin, 2015) and in 2022, Georgiev (2023) found Americans spent an average of two and a half hours daily on social media. Furthermore, social media use is tied to mental well-being, work confidence levels, and feelings of being an imposter (Johnson et al., 2020; Uram & Skalski, 2022; Hernandez & Chalk, 2021; Myers, 2021; Ramm, 2019).
This project examined the role of social media use among college …
Little River Shoreline Stabilization Project, Natalie M. Hester, Steven Connor Tremyane, Libby Vanderloo, Isaac Macon
Little River Shoreline Stabilization Project, Natalie M. Hester, Steven Connor Tremyane, Libby Vanderloo, Isaac Macon
Chancellor’s Honors Program Projects
No abstract provided.
Fabrication Of Black Phosphorus Terahertz Photoconductive Antennas, Nathan Tanner Sawyers
Fabrication Of Black Phosphorus Terahertz Photoconductive Antennas, Nathan Tanner Sawyers
Physics Undergraduate Honors Theses
Terahertz (THz) photoconductive antennas (PCAs) using 40nm thin-film flakes of black phosphorus (BP) and hexagonal boron nitride (hBN) have been shown computationally to be capable of THz emission comparable to those based on GaAs [2]. In this paper, I briefly describe the scientific and practical interest in THz emissions and explain what warrants research into black phosphorus as a photoconductive semiconductor in THz devices. Furthermore, I outline the basic principle of how these antennas work and mention alternative designs produced by other researchers in the past. Finally, I summarize the fabrication process of these antennas, as well as the measurements …
Medical Simu-Vest, Noah Presley Robison, Sarah Meeks, Mckenzie England, Tyler Morris
Medical Simu-Vest, Noah Presley Robison, Sarah Meeks, Mckenzie England, Tyler Morris
Chancellor’s Honors Program Projects
No abstract provided.
Temperature Driven Nitinol Expandable For Intramedullary Fixation, Ethan Connor, Tony George, Prem Patel, Jamie Pouncey
Temperature Driven Nitinol Expandable For Intramedullary Fixation, Ethan Connor, Tony George, Prem Patel, Jamie Pouncey
Chancellor’s Honors Program Projects
No abstract provided.