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All Graduate Theses and Dissertations

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Full-Text Articles in Engineering

Development Of A Two-Level Warping Algorithm And Its Application To Speech Signal Processing, Al-Waled H. Al-Dulaimi May 2021

Development Of A Two-Level Warping Algorithm And Its Application To Speech Signal Processing, Al-Waled H. Al-Dulaimi

All Graduate Theses and Dissertations

In many different fields there are signals that need to be aligned or “warped” in order to measure the similarity between them. When two time signals are compared, or when a pattern is sought in a larger stream of data, it may be necessary to warp one of the signals in a nonlinear way by compressing or stretching it to fit the other. Simple point-to-point comparison may give inadequate results, because one part of the signal might be comparing different relative parts of the other signal/pattern. Such cases need some sort of alignment todo the comparison. Dynamic Time Warping ...


Application Of Flow And Ion Data To Estimate Ungaged Inflows And Losses In Urban And Agricultural Sub-Reaches Of The Logan River Observatory, Hyrum Tennant May 2021

Application Of Flow And Ion Data To Estimate Ungaged Inflows And Losses In Urban And Agricultural Sub-Reaches Of The Logan River Observatory, Hyrum Tennant

All Graduate Theses and Dissertations

Streams in urban and agricultural environments are often heavily diverted for irrigation and drinking water purposes. These streams can receive inflow from unmeasured sources including stormwater returns, groundwater drains, and irrigation runoff that will help sustain flow during dry periods. Due to an inability to identify the source of most of these inflows or directly measure their volumes, there is a clear need for identification and quantification methods. Streamflow data from the Logan River Observatory illustrates the importance of unidentified inflows in sections influenced by large diversions. To understand the role of unidentified inflows and possible outflows in this portion ...


Effects Of Climate Forcing Uncertainty On High-Resolution Snow Modeling And Streamflow Prediction In A Mountainous Karst Watershed, Conor Tyson May 2021

Effects Of Climate Forcing Uncertainty On High-Resolution Snow Modeling And Streamflow Prediction In A Mountainous Karst Watershed, Conor Tyson

All Graduate Theses and Dissertations

Snow-dominated, karst watersheds present particular challenges to accurately modeling streamflow in response to differing climate conditions. This is due to the uneven distribution of snow within a basin, the varied melting rates due to terrain and climate, and the difficulty determining flow paths through karst conduits below ground. One possible solution to these challenges is to model snow at a fine scale, but climate variables are not available at these smaller spatial scales. The choices about which climate dataset to use, and how to downscale the data to a fine scale, will likely affect the accuracy of streamflow simulations. This ...


Design Of Miniaturized Sweeping Langmuir Probe And Electric Field Probe For The Sport Mission, Nathan P. Tipton May 2021

Design Of Miniaturized Sweeping Langmuir Probe And Electric Field Probe For The Sport Mission, Nathan P. Tipton

All Graduate Theses and Dissertations

The Scintillation Prediction Observation Research Task (SPORT) is a joint United States of America and Brazil 6U CubeSat mission. The US is providing the science instruments and the spacecraft launch. Brazil is providing the spacecraft bus, integration, and operations. Utah State University will provide four instruments for the mission as part of the US contribution in a suite called the Space Weather Probes (SWP). These instruments are the Sweeping Langmuir Probe (SLP), the Electric Field Probe (EFP), and the Sweeping Impedance Probe (SIP). Higher frequency components of the SLP and EFP will be observed through a Wave Spectrometer (WS). These ...


Raw Depth Image Enhancement Using A Neural Network, Xuan Xie May 2021

Raw Depth Image Enhancement Using A Neural Network, Xuan Xie

All Graduate Theses and Dissertations

The term image is often used to denote a data format that records information about a scene’s color. This dissertation object focuses on a similar format for recording distance information about a scene, “depth images”. Depth images have been used extensively in consumer-level applications, such as Apple’s Face ID, based on depth images for face recognition.

However, depth images suffer from low precision and high errors, and some post-processing techniques need to be utilized to improve their quality. Deep learning, or neural networks, are frameworks that use a series of hierarchically arranged nonlinear networks to process input data ...


Modeling, Simulation And Optimization Of Nuclear Hybrid Energy Systems Using Openmodelica And Raven, Stephen Michael Hills May 2021

Modeling, Simulation And Optimization Of Nuclear Hybrid Energy Systems Using Openmodelica And Raven, Stephen Michael Hills

All Graduate Theses and Dissertations

Nuclear hybrid energy systems (NHES) are a viable option to combine renewable energy sources, such as wind, with a less fluctuating energy source. Given recent development and their inherent safer and modular design, small modular reactors (SMRs), which are smaller versions of a nuclear reactor, can play an instrumental role in complementing renewables and supporting carbon-free power sectors in the coming decades. With increasing population and demand for clean water, Freeze desalination (FD), which uses freezing to separate water from salt, is a possible way to produce clean water while converting excess power from a SMR into stored thermal energy ...


Accounting For Critical Attributes And Uncertainty In Flow-Ecology Relationships, Elizabeth Decker Morgan May 2021

Accounting For Critical Attributes And Uncertainty In Flow-Ecology Relationships, Elizabeth Decker Morgan

All Graduate Theses and Dissertations

Environmental flows are used to maintain streamflow for aquatic species in rivers while also sustaining human water requirements. While there are many approaches to develop environmental flows, they all rely on a strong conceptual understanding of flow-ecology relationships, which are often uncertain. Uncertainty in flow-ecology relationships can stem from using limited data to develop or test relationships or an incomplete understanding of the attributes inherent to each relationship, such as climate and land conditions. Accounting for these attributes and uncertainty in flow-ecology relationships is critical given mounting interest to develop and implement environmental flows at large scales, often with limited ...


Algorithms For The Calibration And Correction Of Texel Images Using Inertial Measurement Updates, Trevor C. Welch May 2021

Algorithms For The Calibration And Correction Of Texel Images Using Inertial Measurement Updates, Trevor C. Welch

All Graduate Theses and Dissertations

A 3D terrain map can be developed to survey the earth’s surface and provide scientists with a method of accurately modeling terrain. Some of the applications include agricultural surveys, disaster management, and object classification. In order to develop a 3D terrain map, a sensor must capture all of the data to create the map. This 3D mapping tool can be made by combining a sensor that take samples of points on the earth’s surface and combines that with a digital camera that takes an image and lays it across those samples of the earth.

In order to take ...


Application Of Computational Fluid Dynamics To Determine Gas Expansion Factors Of Differential Pressure Flow Meters, Patrick L. Campana May 2021

Application Of Computational Fluid Dynamics To Determine Gas Expansion Factors Of Differential Pressure Flow Meters, Patrick L. Campana

All Graduate Theses and Dissertations

The purpose of this research was to investigate if computer simulations could be used to accurately predict gas expansion in differential pressure flow meters. Differential pressure flow meters are used to measure the flow rate of pressurized liquids and gases through pipes. Computer simulations of liquid and gas flows were conducted for three distinct differential pressure flow meter geometries: Classical Venturis, Stand Concentric orifice plates, and wedge meters.

Gas flows were modeled as dry air using the assumption of a perfect gas. Expansion effects were modeled using the ideal gas law. Computer simulations of Classical Venturi and Standard Concentric orifice ...


A Laboratory Study On The Geometric Effects Of Piano Key Weirs On Scour For Non-Cohesive Substrates And Simple Mitigation Techniques, Wyatt Lantz May 2021

A Laboratory Study On The Geometric Effects Of Piano Key Weirs On Scour For Non-Cohesive Substrates And Simple Mitigation Techniques, Wyatt Lantz

All Graduate Theses and Dissertations

Sustainable flood control infrastructure is needed as climate change continues to produce more extreme precipitation events, as our water infrastructure continues to age, and as populations continue to grow and expand. Non-linear weirs, such as labyrinth and piano key weirs, are sustainable passive flood-control structures due to their improved hydraulic performance, and low maintenance and construction costs. However, like other structures, these weirs are susceptible to local scour, which is removal of soil and rock due to hydraulic forces. The scour phenomenon is a complicated process dependent upon multiple variables. There is limited information for non-linear weirs with little directed ...


A Laboratory Study Of The Hydraulics Of Moderate-Sloped Stepped Chutes With A Labyrinth Crest, L. Kade Flake May 2021

A Laboratory Study Of The Hydraulics Of Moderate-Sloped Stepped Chutes With A Labyrinth Crest, L. Kade Flake

All Graduate Theses and Dissertations

Evolving methods of dam construction and rehabilitation require unique and innovative spillways. Spillways provide passage for water impounded by a dam. Stepped chute spillways offer an efficient and economical solution for dam construction and rehabilitation. Labyrinth weirs, which allow high flow discharge within a compact footprint, are often an economical solution for the spillway crest at a chute entrance. Labyrinth weirs have recently been combined with stepped chutes in several locations. However, published literature is scarce for the flow properties and key design parameters of these combined structures.

This study researched the hydraulics downstream of a labyrinth crest for two ...


Sustainable Agricultural Development In The Western Desert Of Egypt Under Climate Change: A Case Study Of The Siwa Region, Noha Hossam Moghazy May 2021

Sustainable Agricultural Development In The Western Desert Of Egypt Under Climate Change: A Case Study Of The Siwa Region, Noha Hossam Moghazy

All Graduate Theses and Dissertations

The Siwa region located in the Western Desert of Egypt is a natural depression and has a large volume of groundwater from the non-renewable Nubian Sandstone Aquifer System (NSAS). Recently the government initiated a development project to reclaim 1.5 million acres where most of the lands are located in the Western Desert to use available groundwater from NSAS. The primary goal of this project is to increase agricultural areas enabling rural development. Siwa is one of the areas that will be reclaimed in the desert by about 30,000 acres consisting of good soil quality. This dissertation aims to ...


Three-Phase Unfolding Based Soft Dc-Link Converter Topologies For Ac To Dc Applications, Dorai Babu Yelaverthi May 2021

Three-Phase Unfolding Based Soft Dc-Link Converter Topologies For Ac To Dc Applications, Dorai Babu Yelaverthi

All Graduate Theses and Dissertations

Battery electric vehicles (BEVs) and plugin hybrid electric vehicles (PHEVs) are more efficient than internal combustion-based vehicles. Adaption of EVs will help reduce the carbon emissions produced by the transportation sector. The charging infrastructure has to grow at a rapid pace to encourage EV adaption. Installing higher capacity fast chargers will help alleviate the range anxiety of battery electric vehicle customers. More public charging stations are required for the full adaption of EVs. Utility power is distributed as ‘alternating current.’ A battery requires ‘direct current’ (DC) source to charge it. Hence a power converter that converts AC source to DC ...


Sonic Boom Loudness Reduction Through Localized Supersonic Aircraft Equivalent-Area Changes, Troy A. Abraham May 2021

Sonic Boom Loudness Reduction Through Localized Supersonic Aircraft Equivalent-Area Changes, Troy A. Abraham

All Graduate Theses and Dissertations

The NASA University Leadership Initiative (ULI) titled “Adaptive Aerostructures for Revolutionary Civil Supersonic Transportation” looks to study the feasibility of distributed structural adaptivity on a supersonic aircraft for maintaining acceptable en-route sonic boom loudness during overland flight. The ULI includes a team of industry and university partners that are working together to develop and implement the systems necessary to accomplish this goal.

The Utah State University Aerolab is a member of this ULI team and has been tasked with developing and using low-fidelity supersonic aerodynamic and sonic boom predictions tools to rapidly study the effects of localized geometry changes on ...


Computational Fluid Dynamics Benchmark Validation Experiment Of Plenum-To-Plenum Flow Through Vertical Heated Parallel Channels, Austin W. Parker May 2021

Computational Fluid Dynamics Benchmark Validation Experiment Of Plenum-To-Plenum Flow Through Vertical Heated Parallel Channels, Austin W. Parker

All Graduate Theses and Dissertations

The next generation of nuclear power plants will have higher efficiency and improved safety, among other benefits; one attractive option is the high temperature gas reactor. An ability to predict the physics that occur within the reactor under normal conditions and accident scenarios is necessary before it receives regulatory licensing for use. The flow through a high temperature gas reactor involves complex interactions of heat transfer, fluids, and solids.

One method for simulating complex fluid dynamics is called Computational Fluid Dynamics. These simulations have already been used to predict the complex fluid flows found in high temperature gas reactors. Predicting ...


Sensitivity And Estimation Of Aerodynamic, Propulsion, And Inertial Parameters For Rudderless Aircraft Using Simulation, Jaden Thurgood May 2021

Sensitivity And Estimation Of Aerodynamic, Propulsion, And Inertial Parameters For Rudderless Aircraft Using Simulation, Jaden Thurgood

All Graduate Theses and Dissertations

A technique known as system identification is often used in aircraft design and testing to understand and validate the mathematical parameters that describe the aircrafts stability and handling characteristics. System identification can be thought of as the inverse of simulation. In the world of system identification, we have a physical system that we seek to understand in more detail by monitoring the system with an array of sensors. In short, we conduct tests of an aircraft while recording the inputs and response outputs. Then we take the input and output data and run it through an algorithm that seeks to ...


Development Of A Variable Extensometer Method For Measuring Ductility Scaling Parameters, Adam J. Smith May 2021

Development Of A Variable Extensometer Method For Measuring Ductility Scaling Parameters, Adam J. Smith

All Graduate Theses and Dissertations

Ductility is the measure of how much a material can stretch before separation. It is usually measured in percent elongation, which is the amount a material stretches divided by its original length before stretching. This is an important property to understand for both the design for performance and safety. A material’s ductility can be influenced by several factors including heat treatment, machining, temperature, and radiation dose. Materials used in nuclear energy facilities are often exposed to all these factors, and it is important to be able to understand ductility at each possible combination.

Ductility is usually characterized through tension ...


Uses And Challenges Of Collecting Lidar Data From A Growing Autonomous Vehicle Fleet: Implications For Infrastructure Planning And Inspection Practices, Md Ashikur Rahman May 2021

Uses And Challenges Of Collecting Lidar Data From A Growing Autonomous Vehicle Fleet: Implications For Infrastructure Planning And Inspection Practices, Md Ashikur Rahman

All Graduate Theses and Dissertations

Autonomous vehicles (AVs) that utilize LiDAR (Light Detection and Ranging) and other sensing technologies are becoming an inevitable part of transportation industry. Concurrently, transportation agencies are increasingly challenged with the management and tracking of large-scale highway asset inventory. LiDAR has become popular among transportation agencies for highway asset management given its advantage over traditional surveying methods. The affordability of LiDAR technology is increasing day by day. Given this, there will be substantial challenges and opportunities for the utilization of big data resulting from the growth of AVs with LiDAR. A proper understanding of the data size generated from this technology ...


Biomethanation And Alkaline Wet Air Oxidation Of Water Hyacinth (Pontederia Crassipes) From Ozama River, Dominican Republic, Yessica A. Castro May 2021

Biomethanation And Alkaline Wet Air Oxidation Of Water Hyacinth (Pontederia Crassipes) From Ozama River, Dominican Republic, Yessica A. Castro

All Graduate Theses and Dissertations

Obtaining valuable products from environmental remediation waste is a sustainable approach that contributes to the ecological well-being of developing countries. In the present work, the feasibility of the water hyacinth anaerobic digestion as a post-weed management practice in the Ozama River (Dominican Republic) was demonstrated. The estimated energy required for harvesting was lower than that produced during digestion. The biomethanation of water hyacinth was improved by Alkaline Wet Air Oxidation (AWAO), a thermochemical pretreatment process that almost doubled the methane production rate and increased the yield by 24% when conducted at high temperatures. At lower temperatures, the methane yield of ...


Numerical Simulation Of Losses In Four-Way Pipe Junctions, Simon Barth May 2021

Numerical Simulation Of Losses In Four-Way Pipe Junctions, Simon Barth

All Graduate Theses and Dissertations

To design pipelines, engineers need to know how much energy the fluid in the pipe has at different locations in the pipe network. The energy the fluid has comes in the form of pressure, velocity, and elevation. As fluid travels through a pipe, it loses energy for many different reasons. Some of those reasons include friction between the fluid and the pipe wall, shear forces within the fluid, changes in flow direction, changes in elevation, or various pipe fittings like elbows, tee’s, valves, reducers, and expanders. Many of the causes of energy loss are well researched. One cause of ...


Analytic Guidance Strategies For Passively Safe Rendezvous And Proximity Operations, Simon Shuster Dec 2020

Analytic Guidance Strategies For Passively Safe Rendezvous And Proximity Operations, Simon Shuster

All Graduate Theses and Dissertations

A safety ellipse is a type of relative motion trajectory that is commonly used for unmanned rendezvous and proximity operations. As the name suggests, safety ellipses are passively safe relative motion trajectories, which means that their natural motion inherently maintains a low collision risk. The focus of this dissertation is the derivation, analysis, and application of guidance strategies that reconfigure, establish, and exit a safety ellipse. The guidance strategies consist of a set of ∆v vectors and impulse times, all written in closed form. Through applications of optimal control theory and parameter optimization, it is shown that these maneuver sequences ...


Hydraulic Analysis Of Coupling A Labyrinth Weir With A Steep Stepped Chute, Tucker J. Jorgensen Dec 2020

Hydraulic Analysis Of Coupling A Labyrinth Weir With A Steep Stepped Chute, Tucker J. Jorgensen

All Graduate Theses and Dissertations

There are many considerations involved in the design of a dam structure. A few of these include minimizing upstream flooding (and risk of embankment overtopping), economical construction, and downstream erosion. Addressing these concerns has, in part, led to a recent increase in the use of more efficient and economical hydraulic. Complex hydraulic structures such as labyrinth weirs and stepped chutes require extensive study to establish design methods. Combining two complex structures can result in dramatic changes in flow characteristics. This is particularly true in the case of combining a labyrinth weir with a stepped chute. Flow from the labyrinth weir ...


"You Can Tell They Care": A Phenomenographic Study Of Student Experiences With Empathic Concern Expressed By Professors In Engineering, Kate Youmans Dec 2020

"You Can Tell They Care": A Phenomenographic Study Of Student Experiences With Empathic Concern Expressed By Professors In Engineering, Kate Youmans

All Graduate Theses and Dissertations

In order to address the increasingly complex challenges of the 21st century, there is a need to continue to grow the technical workforce by improving graduation rates of engineering students. To accomplish this, the culture of engineering programs must shift from demanding or intimidating to more inclusive and supportive. Professors can play a critical role in creating these cultures by building relationships with students. Empathic concern is essential in building relationships that can encourage student growth and development. This form of empathy, sometimes referred to as care or concern, is expressed through actions of understanding, compassion, and non-judgement. While research ...


Characterizing Water And Water-Related Energy Use In Multi-Unit Residential Structures With High Resolution Smart Metering Data, Joseph C. Brewer Dec 2020

Characterizing Water And Water-Related Energy Use In Multi-Unit Residential Structures With High Resolution Smart Metering Data, Joseph C. Brewer

All Graduate Theses and Dissertations

As urban populations continue to grow and expand, localized demands on water supplies continue to increase as well. These water supplies, which have been historically stable, are also threatened by an increasingly erratic climate. Together, these two factors have significantly increased the likelihood of long-term drought conditions in the American West. In response, water suppliers are investigating new ways to record water use in urban areas to better understand how water is used. One of these methods is smart meters; advanced devices that can record and transmit water use information directly to the water supplier. However, these devices can produce ...


Self-Describing Fiducials For Gps-Denied Navigation Of Unmanned Aerial Vehicles, Amanda J. Strate Dec 2020

Self-Describing Fiducials For Gps-Denied Navigation Of Unmanned Aerial Vehicles, Amanda J. Strate

All Graduate Theses and Dissertations

Accurate estimation of an Unmanned Aerial Vehicle’s (UAV’s) location is critical for the operation of the UAV when it is controlled completely by its onboard processor. This can be particularly challenging in environments in which GPS is not available (GPS-denied). Many of the options previously explored for estimation of a UAV’s location without the use of GPS require more sophisticated processors than can feasibly be mounted on a UAV because of weight, size, and power restrictions. Many options are also aimed at indoor operation without the range capabilities to scale to outdoor operations. This research explores an ...


Effects Of Short Season Irrigation On Pasture Yield And Predicting Yield With Sentinel-2 Satellite, Ihsan Bugra Bugdayci Dec 2020

Effects Of Short Season Irrigation On Pasture Yield And Predicting Yield With Sentinel-2 Satellite, Ihsan Bugra Bugdayci

All Graduate Theses and Dissertations

Deficit irrigation can reduce agriculture water use making additional water available for other uses. This study looked at multi-year impacts of deficit irrigation on pasture yield. The results show that that early irrigation provides the most benefit to cool season pastures and late season irrigation only had small impacts on yield. According to this research, irrigation water can be saved without impacting the yield importantly.

Remote sensing techniques are becoming a part of agriculture. Yield predictions are important for the farmers and others involved with agriculture. In this research, relationships between the normalized difference vegetation index (NDVI) calculated from remotely ...


Closed-Loop Propulsive Control For Very Low Perigee Orbit Energy Management And Stabilization, Tyler J. Gardner Dec 2020

Closed-Loop Propulsive Control For Very Low Perigee Orbit Energy Management And Stabilization, Tyler J. Gardner

All Graduate Theses and Dissertations

Within the past decade, the United States Air Force has begun exploring options for using smaller satellites, known as SmallSats and CubeSats, to decrease the time it takes to design and build new satellites. If used properly, a rapid development environment for satellites could improve the Air Force's ability to respond to new technologies and threats. Other organizations such as NASA and universities have been using SmallSats and CubeSats for research and development missions.

While smaller satellites are usually much cheaper to develop and require less time to create, limited volume strictly constrains the size of instrumentation and avionics ...


Formal Verification Of The Adversarial Robustness Property Of Deep Neural Networks Through Dimension Reduction Heuristics, Refutation-Based Abstraction, And Partitioning, Joshua Smith Dec 2020

Formal Verification Of The Adversarial Robustness Property Of Deep Neural Networks Through Dimension Reduction Heuristics, Refutation-Based Abstraction, And Partitioning, Joshua Smith

All Graduate Theses and Dissertations

Neural networks are tools that are often used to perform functions such as object recognition in images, speech-to-text, and general data classification. Because neural networks have been successful at approximating these functions that are difficult to explicitly write, they are seeing increased usage in fields such as autonomous driving, airplane collision avoidance systems, and other safety-critical applications. Due to the risks involved with safety-critical systems, it is important to provide guarantees about the networks performance under certain conditions. As an example, it is critically important that self driving cars with neural network based vision systems correctly identify pedestrians 100% of ...


Soft-Switched Resonant Dc-Dc Converter In Underwater Dc Power Distribution Network, Tarak Saha Dec 2020

Soft-Switched Resonant Dc-Dc Converter In Underwater Dc Power Distribution Network, Tarak Saha

All Graduate Theses and Dissertations

Power distribution with DC source is advantageous over its AC counterpart in long distance distribution network due to the absence of effects of reactive components. Long distance power distribution with traditional voltage source suffers from drop in voltage over the length of the cable due to its impedance and forces the converters in the network to be over-designed with higher power rating than needed. In underwater power distribution network such as ocean observatory, marine sensors on the sea-bed etc., power conversion modules are situated at a distance far away from the shore, ranging from tens of kilometers to hundreds of ...


System Level Characterization Of The Gridded Retarding Ion Drift Sensor (Grids) For The Petitsat Mission, Benjamin B. Oborn Dec 2020

System Level Characterization Of The Gridded Retarding Ion Drift Sensor (Grids) For The Petitsat Mission, Benjamin B. Oborn

All Graduate Theses and Dissertations

Weather prediction, wherever people live, serves as a beneficial part of everyday life. Weather in the upper portions of Earth’s atmosphere also impacts life on Earth but it is not able to be predicted as well as its terrestrial counterpart. PetitSat is a cube satellite (CubeSat) mission proposed to help remedy this issue. It will collect measurements of charged particles in the upper atmosphere called a plasma. The measurements taken by PetitSat will facilitate better prediction of upper-atmospheric weather. Prediction of when and where weather phenomenon will occur will allow avoidance of negative consequences that can result. Once such ...