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Articles 1 - 30 of 2973
Full-Text Articles in Engineering
Trading Up: Exchanging Our Data For A Better Life, Nathan Turner
Trading Up: Exchanging Our Data For A Better Life, Nathan Turner
Marriott Student Review
We live in a data-driven economy. Many people feel like consumers are on the losing end of an economic data-battle with tech giants, but this is simply not true; our data can drive innovation. That’s right—personal data collected from you and me can influence new technologies that will improve our lives. This should excite us, but our fear of losing data privacy can quell our excitement for progress and even restrict innovation. Our quality of life has already begun to improve through data driven innovation, and technological progress is not slowing down. If we let our fear of ...
New Policies Give Solar Users An Economic Boost, Olivia Fowler
New Policies Give Solar Users An Economic Boost, Olivia Fowler
Marriott Student Review
The future looks bright for Solar Energy, as more States and Territories in the United States commit to moving to 100% renewable energy. What are the different states and territories committing to exactly, and what economic incentives are they bringing? Find out in this article by author Olivia Fowley.
Polyester Polymer Concrete For Bridge Deck Overlays, Robert James Stevens
Polyester Polymer Concrete For Bridge Deck Overlays, Robert James Stevens
Theses and Dissertations
The objectives of this research were to 1) compile a synthesis of information about polyester polymer concrete (PPC) from the literature; 2) conduct a scanning tour to observe PPC construction, inspect in-service PPC overlays, and discuss topics related to PPC; 3) revise the existing Utah Department of Transportation (UDOT) PPC specification; 4) document a PPC field demonstration project; and 5) perform laboratory characterization of the material properties of field-mixed PPC. The scope of the research included a scanning tour, field testing, and laboratory experimentation. The objectives of the scanning tour included observation of a PPC overlay placement, inspection of existing ...
Isogeometric Shell Analysis: Multi-Patch Coupling And Overcoming Locking, Zhihui Zou
Isogeometric Shell Analysis: Multi-Patch Coupling And Overcoming Locking, Zhihui Zou
Theses and Dissertations
The fundamental advantages of applying Isogeometric Analysis (IGA) to shell analysis have been extensively demonstrated across a wide range of problems and formulations. However, a phenomenon called numerical locking is still a major challenge in IGA shell analysis, which can lead to dramatically deteriorated analysis accuracy. Additionally, for complex thin-walled structures, a simple and robust coupling technique is desired to sew together models composed of multiple patches. This dissertation focuses on addressing these challenges of IGA shell analysis. First, an isogeometric dual mortar method is developed for multi-patch coupling. This method is based on Be ?zier extraction and projection and ...
An Open-Source Web-Application For Regional Analysis Of Grace Groundwater Data And Engaging Stakeholders In Groundwater Management, Travis Clinton Mcstraw
An Open-Source Web-Application For Regional Analysis Of Grace Groundwater Data And Engaging Stakeholders In Groundwater Management, Travis Clinton Mcstraw
Theses and Dissertations
Since 2002, NASA's GRACE Satellite mission has allowed scientists of various disciplines to analyze and map the changes in Earth's total water storage on a global scale. Although the raw data is available to the public, the process of viewing, manipulating, and analyzing the GRACE data can be difficult for those without strong technological backgrounds in programming or geospatial software. This is particularly true for water managers in developing countries, where GRACE data could be a valuable asset for sustainable water resource management. To address this problem, I have a developed a utility for subsetting GRACE data to ...
Bacteria In Blood: Optimized Recovery Of Bacterial Dna For Rapid Identification, Ryan Wood
Bacteria In Blood: Optimized Recovery Of Bacterial Dna For Rapid Identification, Ryan Wood
Theses and Dissertations
Blood stream infections are challenging infections to rapidly diagnose. The current clinical diagnostic methods for blood stream infections require culturing the blood sample prior to identifying the bacteria and any resistance the bacteria may contain. Removing the culturing step from the bacterial identification process of a blood stream infection provides a significant reduction in the processing time. However, eliminating the culturing step shifts the difficulty from processing time to concentration, since clinical concentration levels can be as low as 10 CFU/mL in blood. This dissertation developed and evaluated many aspects of the process required to identify bacteria from a ...
Error-State Estimation And Control For A Multirotor Uav Landing On A Moving Vehicle, Michael David Farrell
Error-State Estimation And Control For A Multirotor Uav Landing On A Moving Vehicle, Michael David Farrell
Theses and Dissertations
Though multirotor unmanned aerial vehicles (UAVs) have become widely used during the past decade, challenges in autonomy have prevented their widespread use when moving vehicles act as their base stations. Emerging use cases, including maritime surveillance, package delivery and convoy support, require UAVs to autonomously operate in this scenario. This thesis presents improved solutions to both the state estimation and control problems that must be solved to enable robust, autonomous landing of multirotor UAVs onto moving vehicles.Current state-of-the-art UAV landing systems depend on the detection of visual fiducial markers placed on the landing target vehicle. However, in challenging conditions ...
Thermal Atomization Due To Boiling During Droplet Impingement On Superhydrophobic Surfaces, Preston Todd Emerson
Thermal Atomization Due To Boiling During Droplet Impingement On Superhydrophobic Surfaces, Preston Todd Emerson
Theses and Dissertations
Superhydrophobic (SH) surfaces are characterized by their extraordinary water repellent qualities. When water comes in contact with these surfaces, it beads up and rolls around. This phenomenon is due partially to surface chemistry which promotes weak adhesive forces between liquid and solid. However, micro- and nanoscale surface roughness also plays a crucial role by trapping air beneath the liquid, reducing liquid-solid contact. Many advantages of these surfaces have been identified, including drag reduction and self-cleaning properties, and the body of research regarding them has grown rapidly over the past few decades.This thesis is concerned with water droplets impinging superheated ...
A Soft-Error Reliability Testing Platform For Fpga-Based Network Systems, Hayden Cole Rowberry
A Soft-Error Reliability Testing Platform For Fpga-Based Network Systems, Hayden Cole Rowberry
Theses and Dissertations
FPGAs are frequently used in network systems to provide the performance and flexibility that is required of modern computer networks while allowing network vendors to bring products to market quickly. Like all electronic devices, FPGAs are vulnerable to ionizing radiation which can cause applications operating on an FPGA to fail. These low-level failures can have a wide range of negative effects on the performance of a network system. As computer networks play a larger role in modern society, it becomes increasingly important that these soft errors are addressed in the design of network systems.This work presents a framework for ...
Improving Hydroshare And Web Application Interoperability Through Integrated Gis And His Data Services, Kenneth Jack Lippold
Improving Hydroshare And Web Application Interoperability Through Integrated Gis And His Data Services, Kenneth Jack Lippold
Theses and Dissertations
HydroShare is a collaborative online system being developed by the Consortium of Universities for the Advancement of Hydrologic Science Inc. (CUAHSI) with the goal of facilitating the dissemination, visualization, and publishing of hydrologic data and models. External web applications serve a key role in extending HydroShare's capabilities, so robust application programming interfaces (APIs) are a vital component of HydroShare's architecture. Hydrologic data stored on HydroShare are defined by a data type, and much of these data are either geospatial or time series data. Although HydroShare's API provides ways to upload and download files, as well as access ...
Maverick: A Stand-Alone Cad Flow For Partially Reconfigurable Fpga Modules, Dallon Godfrey Glick
Maverick: A Stand-Alone Cad Flow For Partially Reconfigurable Fpga Modules, Dallon Godfrey Glick
Theses and Dissertations
Circuit designs for field-programmable gate arrays (FPGAs) are typically compiled by FPGA vendor tools, such as Xilinx's Vivado Design Suite. In recent years, partial reconfiguration (PR) has emerged as a popular technique that allows portions of an FPGA to be dynamically reconfigured after the complete device has been configured with an initial bitstream. However, the nature of current FPGA vendor tools limits further innovation and possible usage models of PR.This thesis presents Maverick, an open-source proof-of-concept computer-aided design (CAD) flow for generating reconfigurable modules (RMs) which target PR regions in FPGA designs. Maverick builds upon existing open source ...
Investigation Of Electrocoating Mechanisms, Tyler James Marlar
Investigation Of Electrocoating Mechanisms, Tyler James Marlar
Theses and Dissertations
The objective of this work is to advance the mechanistic understanding of cathodic electrocoating. These efforts are focused on the initial processes responsible for deposition, which are examined through direct experimentation and simulation. Electrocoating is a global industrial process providing a corrosive resistant base paint to automobile bodies. Presently, empirical models are used to model coating thickness; these models tend to overpredict deposition in occluded areas. Convection is implemented to study the behavior of adhered surface H2 bubbles on the substrate surfaces. The impact of surface H2 bubbles and early e-coat deposition on the local current density is studied using ...
Exploring The Efficiency Of Software-Defined Radios In 3d Heat Mapping, Andrew Scott Thomas
Exploring The Efficiency Of Software-Defined Radios In 3d Heat Mapping, Andrew Scott Thomas
Theses and Dissertations
A common method of connecting to the internet is a wireless network. These networks can be monitored to discover the area of their coverage, but commercial receivers don't always provide the most accurate results. A software-defined radio was programmed to sniff wireless signals and tested against a commercial receiver and the results were compared. The results suggest that the software-defined radio performs at least as well as the commercial receiver in distance measurements and significantly better in samples taken per minute. It was determined that the software-defined radio is a viable replacement for a commercial receiver in 3D heat ...
Trajectory Optimization And Design For A Large Number Of Unmanned Aerial Vehicles, Jenna Elisabeth Newcomb
Trajectory Optimization And Design For A Large Number Of Unmanned Aerial Vehicles, Jenna Elisabeth Newcomb
Theses and Dissertations
An unmanned aerial vehicle (UAV) swarm allows for a more time-efficient method of searching a specified area than a single UAV or piloted plane. There are a variety of factors that affect how well an area is surveyed. We specifically analyzed the effect both vehicle properties and communication had on the swarm search performance. We used non-dimensionalization so the results can be applied to any domain size with any type of vehicle. We found that endurance was the most important factor. Vehicles with good endurance sensed approximately 90% to 100% of the grid, even when other properties were lacking. If ...
Variance Reduction In Wind Farm Layout Optimization, Bertelsen Gagakuma
Variance Reduction In Wind Farm Layout Optimization, Bertelsen Gagakuma
Theses and Dissertations
As demand for wind power continues to grow, it is becoming increasingly important to minimize the risk, characterized by the variance, that is associated with long-term power forecasts. This thesis investigated variance reduction in power forecasts from wind farm layout optimization.The problem was formulated as a multi-objective optimization one of maximizing mean-plant-power and minimizing variance. The ε−constraint method was used to solve the bi-objectiveproblem in a two-step optimization framework where two sequential optimizations are performed. The first is maximizing mean wind farm power alone and the second, minimizing variance with a constraint on the mean power which is ...
Durability Of Hybrid Large Area Additive Tooling For Vacuum Infusion Of Composites, Nathan Joseph Northrup
Durability Of Hybrid Large Area Additive Tooling For Vacuum Infusion Of Composites, Nathan Joseph Northrup
Theses and Dissertations
The purpose of this research was to scientifically validate potential cost-saving measures for production of large area additively manufactured tooling for vacuum infusion of composites. These cost saving measures included using a hybrid additive/subtractive manufacturing system to fabricate the mold, requiring lower capital cost and creating shorter lead times. Fiberglass reinforcement was used instead of carbon in the mold material. The validation was done by designing and fabricating a mold for a custom test artifact and analyzing the surface geometry over the course of multiple infusions until tool failure.After printing and machining, the mold required a sealer in ...
Stainless-Steel Column For Robust High Temperature Microchip Gas Chromatography, Abhijit Ghosh, Austin R. Foster, Jacob C. Johnson, Carlos R. Vilorio, Luke T. Tolley, Brian D. Iverson, Aaron R. Hawkins, H. Dennis Tolley, Milton L. Lee
Stainless-Steel Column For Robust High Temperature Microchip Gas Chromatography, Abhijit Ghosh, Austin R. Foster, Jacob C. Johnson, Carlos R. Vilorio, Luke T. Tolley, Brian D. Iverson, Aaron R. Hawkins, H. Dennis Tolley, Milton L. Lee
Faculty Publications
This paper reports the first results of a robust, high performance, stainless-steel microchip gas chromatography (GC) column that is capable of analyzing complex real world mixtures as well as operating at very high temperatures. Using a serpentine design, a 10 m column with an approximately semicircular cross section with a 52 µm hydraulic diameter (Dh) was produced in a 17 cm x 6.3 cm x 0.1 cm rectangular steel chip. The channels were produced using a multilayer chemical etch and diffusion bonding process, and metal nuts were brazed onto the inlet and outlet ports allowing for column ...
Development Of A Gpu-Based Real-Time Interference Mitigating Beamformer For Radio Astronomy, Jeffrey M. Nybo
Development Of A Gpu-Based Real-Time Interference Mitigating Beamformer For Radio Astronomy, Jeffrey M. Nybo
Theses and Dissertations
Radio frequency interference (RFI) mitigation enables radio astronomical observation in frequency bands that are shared with many modern satellite and ground based devices by filtering out the interference in corrupted bands. The present work documents the development of a beamformer (spatial filter) equipped with RFI mitigation capabilities. The beamformer is intended for systems with antenna arrays designed for large bandwidths. Because array data post processing on large bandwidths would require massive memory space beyond feasible limits, there is a need for a RFI mitigation system capable of doing processing on the data as it arrives in real-time; storing only a ...
A New Qpcr Assay To Detect Geosmin-Producing Cyanobacteria, Shane Brian Davis
A New Qpcr Assay To Detect Geosmin-Producing Cyanobacteria, Shane Brian Davis
Theses and Dissertations
Taste-and-odor (T&O) compounds are frequently produced by cyanobacterial blooms in bodies of water. Geosmin, perhaps the most common T&O compound produced by these blooms, is not effectively removed by conventional water treatment processes and frequently causes the tap water to have an off flavor. Although geosmin is not harmful when ingested, it damages the consumers' confidence in the cleanliness of their water. There are treatment options for geosmin removal, but the most common methods are often not implemented until complaints are made by consumers.There has been an increasing amount of research on the use of polymerase chain ...
Groundwater Level Mapping Tool: Development Of A Web Application To Effectively Characterize Groundwater Resources, Steven William Evans
Groundwater Level Mapping Tool: Development Of A Web Application To Effectively Characterize Groundwater Resources, Steven William Evans
Theses and Dissertations
Groundwater is used worldwide as a major source for agricultural irrigation, industrial processes, mining, and drinking water. An accurate understanding of groundwater levels and trends is essential for decision makers to effectively manage groundwater resources throughout an aquifer, ensuring its sustainable development and usage. Unfortunately, groundwater is one of the most challenging and expensive water resources to characterize, quantify, and monitor on a regional basis. Data, though present, are often limited or sporadic, and are generally not used to their full potential to aid decision makers in their groundwater management.This thesis presents a solution to this under-utilization of available ...
An Experimental And Theoretical Investigation Of Internal Wave Kinetic Energy Density In Variable Stratifications, Allison Marie Lee
An Experimental And Theoretical Investigation Of Internal Wave Kinetic Energy Density In Variable Stratifications, Allison Marie Lee
Theses and Dissertations
Internal waves are generated in a fluid if the density increases continuously with depth. The variation in density with depth, or stratification, defines the natural frequency of the fluid N. Two common examples of stratified fluids are the ocean and atmosphere; internal waves are generated continuously in both mediums. Although there are many internal wave generation mechanisms, one common and frequently studied method is tidal flow over oceanic bathymetry. If the local natural frequency of the water near the topography is greater than the tidal frequencyω, internal waves will be generated by the tidal flow over the topography. If N ...
Effects Of Infiltration Temperature, Time, And Gas Flow Rate On Material Properties Of Carbon Infiltration Carbon Nanotubes, Shane Dirk Sypherd
Effects Of Infiltration Temperature, Time, And Gas Flow Rate On Material Properties Of Carbon Infiltration Carbon Nanotubes, Shane Dirk Sypherd
Theses and Dissertations
This work characterizes the material properties of carbon infiltrated carbon nanotube (CI- CNT) structures. The impacts of temperature, time, and hydrogen flow rates on the material prop- erties of modulus of elasticity and strength are examined and compared. Carbon infiltration levels are assessed through the use of SEM images to determine which parameters give the highest level of infiltration. Through the use of SEM, carbon capping is observed on samples infiltrated for longer times at 900 and 950◦ C, suggesting that the samples are not being infiltrated during the entire desired infiltration period at these temperatures. The highest material properties ...
Investigating Inducer Performance Over A Wide Range Of Operating Conditions, David Tate Fanning
Investigating Inducer Performance Over A Wide Range Of Operating Conditions, David Tate Fanning
Theses and Dissertations
Inducer performance is investigated for a variety of inducer geometries operating at multiple flow conditions using computational fluid dynamics. Inducers are used as a first stage in turbopumps to minimize cavitation and allow the pump to operate at lower inlet head conditions. The formation of inlet flow recirculation or backflow in the inducer occurs at low flow conditions and can lead to instabilities and cavitation-induced head breakdown. Backflow formation is often attributed to tip leakage flow. The performance of an inducer with and without tip clearance is examined. Removing the tip clearance eliminates tip leakage flow; however, backflow is still ...
Significance Of The Rates Of Atmospheric Deposition Around Utah Lake And Phosphorus-Fractionation Of Local Soils, Joshua Glen Reidhead
Significance Of The Rates Of Atmospheric Deposition Around Utah Lake And Phosphorus-Fractionation Of Local Soils, Joshua Glen Reidhead
Theses and Dissertations
Eutrophic Utah Lake receives a large nutrient load from a variety of sources, includingtreated wastewater discharges, runoff and tributaries, recycling from bottom sediments andAtmospheric Deposition (AD). AD was the focus of this study and was comprised of twocomplementary parts. First was a study of nitrogen and phosphorus depositions from theatmosphere, and second was a study of phosphorous as contained in soils near Utah Lake viafractionation methods.The soil samples were found to contain approximately 1,000 mg-P/kg soil for totalphosphorus (TP). A separate phosphorus (P) fractionation gave slightly higher values, excludingthe residual P, we are 95% confident that one ...
Predicting Hardness Of Friction Stir Processed 304l Stainless Steel Using A Finite Element Model And A Random Forest Algorithm, Tyler Alan Mathis
Predicting Hardness Of Friction Stir Processed 304l Stainless Steel Using A Finite Element Model And A Random Forest Algorithm, Tyler Alan Mathis
Theses and Dissertations
Friction stir welding is an advanced welding process that is being investigated for use in many different industries. One area that has been investigated for its application is in healing critical nuclear reactor components that are developing cracks. However, friction stir welding is a complicated process and it is difficult to predict what the final properties of a set of welding parameters will be. This thesis sets forth a method using finite element analysis and a random forest model to accurately predict hardness in the welding nugget after processing. The finite element analysis code used and ALE formulation that enabled ...
Robust Coil Combination For Bssfp Mri And The Ordering Problem For Compressed Sensing, Nicholas Brian Mckibben
Robust Coil Combination For Bssfp Mri And The Ordering Problem For Compressed Sensing, Nicholas Brian Mckibben
Theses and Dissertations
Balanced steady-state free precession (bSSFP) is a fast, SNR-efficient magnetic resonance (MR) imaging sequence suffering from dark banding artifacts due to its off-resonance dependence. These banding artifacts are difficult to mitigate at high field strengths and in the presence of metallic implants. Recent developments in parametric modelling of bSSFP have led to advances in banding removal and parameter estimation using multiple phase-cycled bSSFP. With increasing number of coils in receivers, more storage and processing is required. Coil combination is used to reduce dimensionality of these datasets which otherwise might be prohibitively large or computationally intractable for clinical applications. However, our ...
Comparison Of Heat Generation Models In Finite Element Analysis Of Friction Welding, Richard Verile Livingston
Comparison Of Heat Generation Models In Finite Element Analysis Of Friction Welding, Richard Verile Livingston
Theses and Dissertations
Finite element models of friction welding can be used to estimate internal conditions of welds which are useful for weld analysis and developing experimental welding procedures. Many modeling techniques are used to accomplish these goals, each with relative strengths and weaknesses. A comparative analysis of friction welding models using different heat generation methods is presented. The three different heat generation methods examined were viscoplastic friction, constant steady-state generation, and experimentally measured power data. The models were compared against each other using three output measurements: temperature, axial force, and upset. The friction model predicted temperatures within 40 degrees C. Temperature accuracy ...
Techniques For Using Internal Strain-Energy Storage And Release Inorigami-Based Mechanical Systems, Mary Elizabeth Wilson
Techniques For Using Internal Strain-Energy Storage And Release Inorigami-Based Mechanical Systems, Mary Elizabeth Wilson
Theses and Dissertations
The objective of this thesis is to develop and demonstrate techniques for self-deployment of origami-based mechanical systems achieved through internal strain-energy storage and release, with special application to medical implant devices. The potential of compliant mechanisms and related origami-based mechanical systems to store strain-energy make them ideal candidates forapplications requiring an actuation or deployment process, such as space system arrays and minimally invasive surgical devices. The objective of this thesis is achieved by first categorizing differentdeployment methods in origami-based, deployable mechanisms and then further exploring the use of strain energy to facilitate actuation in deployable mechanisms. With this understanding inplace ...
Development Of A Novel Bioprinting System:Bioprinter, Bioink, Characterizationand Optimization, Chandler Alan Warr
Development Of A Novel Bioprinting System:Bioprinter, Bioink, Characterizationand Optimization, Chandler Alan Warr
Theses and Dissertations
The use of 3D printing in biological applications is a new field of study given that 3D printing technology has become more available and user friendly. Possible uses include using existing 3D printing polymers to use in extracorporeal or in vitro devices, like Lab-on-a-Chip, and the development of new biologically derived materials to print cell-containing constructs. The latter concept is what is more commonly known as bioprinting. Our research had the goal of developing a bioprinting system including the printer, a bioink, and a feedback system for printing parameter optimization which could be done cheaply and within the reach of ...
Isogeometric Bezier Dual Mortaring And Applications, Di Miao
Isogeometric Bezier Dual Mortaring And Applications, Di Miao
Theses and Dissertations
Isogeometric analysis is aimed to mitigate the gap between Computer-Aided Design (CAD) and analysis by using a unified geometric representation. Thanks to the exact geometry representation and high smoothness of adopted basis functions, isogeometric analysis demonstrated excellent mathematical properties and successfully addressed a variety of problems. In particular, it allows to solve higher order Partial Differential Equations (PDEs) directly omitting the usage of mixed approaches. Unfortunately, complex CAD geometries are often constituted by multiple Non-Uniform Rational B-Splines (NURBS) patches and cannot be directly applied for finite element analysis.parIn this work, we presents a dual mortaring framework to couple adjacent ...