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Full-Text Articles in Engineering

The Influences Of Calculus I On Engineering Student Persistence, Amie Baisley Dec 2019

The Influences Of Calculus I On Engineering Student Persistence, Amie Baisley

All Graduate Theses and Dissertations

About half of the students that are declared engineering majors end up leaving engineering within their first two years at the university. This happens following the required math and science courses that these students must take before getting into the technical engineering coursework. There are two systems that students must be a part of at the university to feel comfortable and have the desire to continue on in their degree. These include the academic system and the social system. The experiences engineering students have during their first required math course, Calculus I, is likely not promoting integration into these two ...


Rapid Prediction Of Low-Boom And Aerodynamic Performance Of Supersonic Transport Aircraft Using Panel Methods, Ted N. Giblette Dec 2019

Rapid Prediction Of Low-Boom And Aerodynamic Performance Of Supersonic Transport Aircraft Using Panel Methods, Ted N. Giblette

All Graduate Theses and Dissertations

The Utah State University Aerolab developed and tested a set of tools for rapid prediction of the loudness of a sonic boom generated by supersonic transport aircraft. This work supported a larger effort led by Texas A&M to investigate the use of adaptive aerostructures in lowering sonic boom loudness at off design conditions. Successful completion of this effort will improve the feasibility of supersonic commercial transport over land.

Funding was provided by a NASA University Leadership Initiative grant to several universities, including Utah State University, as well as industry partners to complete this work over a five year period ...


Advancing Cyberinfrastructure For Collaborative Data Sharing And Modeling In Hydrology, Tian Gan Dec 2019

Advancing Cyberinfrastructure For Collaborative Data Sharing And Modeling In Hydrology, Tian Gan

All Graduate Theses and Dissertations

Hydrologic research is increasingly data and computationally intensive, and often involves hydrologic model simulation and collaboration among researchers. With the development of cyberinfrastructure, researchers are able to improve the efficiency, impact, and effectiveness of their research by utilizing online data sharing and hydrologic modeling functionality. However, further efforts are still in need to improve the capability of cyberinfrastructure to serve the hydrologic science community. This dissertation first presents the evaluation of a physically based snowmelt model as an alternative to a temperature index model to improve operational water supply forecasts in the Colorado River Basin. Then it presents the design ...


Built-In Return-Oriented Programs In Embedded Systems And Deep Learning For Hardware Trojan Detection, Nathanael R. Weidler Dec 2019

Built-In Return-Oriented Programs In Embedded Systems And Deep Learning For Hardware Trojan Detection, Nathanael R. Weidler

All Graduate Theses and Dissertations

Microcontrollers and integrated circuits in general have become ubiquitous in the world today. All aspects of our lives depend on them from driving to work, to calling our friends, to checking our bank account balance. People who would do harm to individuals, corporations and nation states are aware of this and for that reason they seek to find or create and exploit vulnerabilities in integrated circuits. This dissertation contains three papers dealing with these types of vulnerabilities. The first paper talks about a vulnerability that was found on a microcontroller, which is a type of integrated circuit. The final two ...


Investigation Of Graphene Interconnections For Multifunctional Reconfigurable Antenna Beam Steering, Joshua R. Perkins Aug 2019

Investigation Of Graphene Interconnections For Multifunctional Reconfigurable Antenna Beam Steering, Joshua R. Perkins

All Graduate Theses and Dissertations

In high frequency, high-performance wireless communications, direct line of sight antennas are common. The issue with the line of sight antennas is the need to redirect the physical antenna to achieve the best possible reception. Classical redirections are done by mechanical movements: hand tuning and motors. Our multi-functional re-configurable antenna (MRA) concept allows for electrical and non-mechanical antenna reorientation. This work investigates two important concepts in the development and enhancement of future MRA devices: special, non-interfering, control signal circuitry and nano-sized switching devices that are controlled by the special circuitry. The investigation was conducted with the use of commercially available ...


Stamina: Stochastic Approximate Model-Checker For Infinite-State Analysis, Thakur Neupane Aug 2019

Stamina: Stochastic Approximate Model-Checker For Infinite-State Analysis, Thakur Neupane

All Graduate Theses and Dissertations

Reliable operation of every day use computing system, from simple coffee machines to complex flight controller system in an aircraft, is necessary to save time, money, and in some cases lives. System testing can check for the presence of unwanted execution but cannot guarantee the absence of such. Probabilistic model checking techniques have demonstrated significant potential in verifying performance and reliability of various systems whose execution are defined with likelihood. However, its inability to scale limits its applicability in practice.

This thesis presents a new model checker, STAMINA, with efficient and scalable model truncation for probabilistic verification. STAMINA uses a ...


Angles-Only Ekf Navigation For Hyperbolic Flybys, Iggy Matheson Aug 2019

Angles-Only Ekf Navigation For Hyperbolic Flybys, Iggy Matheson

All Graduate Theses and Dissertations

Space travelers in science fiction can drop out of hyperspace and make a pinpoint landing on any strange new world without stopping to get their bearings, but real-life space navigation is an art characterized by limited information and complex mathematics that yield no easy answers. This study investigates, for the first time ever, what position and velocity estimation errors can be expected by a starship arriving at a distant star - specifically, a miniature probe like those proposed by the Breakthrough Starshot initiative arriving at Proxima Centauri. Such a probe consists of nothing but a small optical camera and a small ...


Agent-Based Model To Manage Household Water Use Through Social-Environmental Strategies Of Encouragement And Peer Pressure, Ryan James Aug 2019

Agent-Based Model To Manage Household Water Use Through Social-Environmental Strategies Of Encouragement And Peer Pressure, Ryan James

All Graduate Theses and Dissertations

Inelastic price responses, demand hardening, and poor public awareness reduce the effectiveness of demand side strategies on water savings. This project quantified phycological household’s factors of attitudes, peer support, opportunities on water conservation with two social-environmental management strategies of encouragement and peer pressure. An agent-based model was populated with data for Logan, Utah using surveys, municipal billing, aerial imagery, weather monitoring stations, and flow, frequency, and durations of appliance use data. Results indicated those households with higher attitudes, peer support and opportunities saved the most water while peer pressure saved more than encouragement when using small and diverse social ...


Statistical Analysis Of A Channel Emulator For Noisy Gradient Descent Low Density Parity Check Decoder, Rakin Muhammad Shadab Aug 2019

Statistical Analysis Of A Channel Emulator For Noisy Gradient Descent Low Density Parity Check Decoder, Rakin Muhammad Shadab

All Graduate Theses and Dissertations

The purpose of a channel emulator is to emulate a communication channel in real-life use case scenario. These emulators are often used in the domains of research in digital and wireless communication. One such area is error correction coding, where transmitted data bits over a channel are decoded and corrected to prevent data loss. A channel emulator that does not follow the properties of the channel it is intended to replicate can lead to mistakes while analyzing the performance of an error-correcting decoder. Hence, it is crucial to validate an emulator for a particular communication channel. This work delves into ...


Predicting Critical Warps In Near-Threshold Gpgpu Applications Using A Dynamic Choke Point Analysis, Sourav Sanyal Aug 2019

Predicting Critical Warps In Near-Threshold Gpgpu Applications Using A Dynamic Choke Point Analysis, Sourav Sanyal

All Graduate Theses and Dissertations

General purpose graphics processing units (GP-GPU), owing to their enormous thread-level parallelism, can significantly improve the power consumption at the near-threshold (NTC) operating region, while offering close to a super-threshold performance. However, process variation (PV) can drastically reduce the GPU performance at NTC. In this work, choke points—a unique device-level characteristic of PV at NTC—that can exacerbate the warp criticality problem in GPUs have been explored. It is shown that the modern warp schedulers cannot tackle the choke point induced critical warps in an NTC GPU. Additionally, Choke Point Aware Warp Speculator, a circuit-architectural solution is proposed to ...


Toward Reliable, Secure, And Energy-Efficient Multi-Core System Design, Prabal Basu Aug 2019

Toward Reliable, Secure, And Energy-Efficient Multi-Core System Design, Prabal Basu

All Graduate Theses and Dissertations

Computer hardware researchers have perennially focussed on improving the performance of computers while stipulating the energy consumption under a strict budget. While several innovations over the years have led to high performance and energy efficient computers, more challenges have also emerged as a fallout. For example, smaller transistor devices in modern multi-core systems are afflicted with several reliability and security concerns, which were inconceivable even a decade ago. Tackling these bottlenecks happens to negatively impact the power and performance of the computers. This dissertation explores novel techniques to gracefully solve some of the pressing challenges of the modern computer design ...


Control And Stability Of Upper Stage Launch Vehicle With Hybrid Arc-Ignition Attitude Control System, Steven Russell Bennett Aug 2019

Control And Stability Of Upper Stage Launch Vehicle With Hybrid Arc-Ignition Attitude Control System, Steven Russell Bennett

All Graduate Theses and Dissertations

The Utah State University Propulsion Research Laboratory (USUPRL) has recently made significant developments in the area of hybrid rocket systems. This type of propulsion system incorporates a solid fuel and a gas or liquid oxidizer. Hybrid rocket systems are known for their inherent safety, reliability, and restart capability. Over the last several years, the USUPRL has successfully built and tested a hybrid rocket system comprising acrylonitrile butadiene styrene (ABS) plastic and gaseous oxygen (GOX). The system was demonstrated to be fully functional during ground, vacuum, and sub-orbital flight testing. Continuing forward, the USUPRL endeavors to extend the capabilities of this ...


Calibration Of Hot-Film X-Probes For High Accuracy Angle Alignment In Wind Tunnels, Dallin L. Jackson Aug 2019

Calibration Of Hot-Film X-Probes For High Accuracy Angle Alignment In Wind Tunnels, Dallin L. Jackson

All Graduate Theses and Dissertations

This thesis investigates the use of hot-film thermal anemometers to align a plate on a wind tunnel at Hill Air Force Base that is used to calibrate Angle of Attack Transmitters on F-16s. A reoccuring problem with this wind tunnel is that no two instruments can verify an angle reading of the the mounting plate for the Angle of Attack Transmitters to the air stream in the wind tunnel. Multiple thermal anemometer calibration methods, such as Jorgensen’s equation and a look-up table are implemented to attemp to achieve consistent measurements between multiple probes. The results show that it is ...


Isentropic Efficiency And Theoretical Analysis Of The Planetary Rotor Expander, Joseph L. James Aug 2019

Isentropic Efficiency And Theoretical Analysis Of The Planetary Rotor Expander, Joseph L. James

All Graduate Theses and Dissertations

Expanders allow pressurized fluids to undergo a pressure decrease in a controlled environment via volumetric growth to extract fluid energy. There are many types of expanders, and the objective of this thesis is to model the efficiencies of the planetary rotor expander (PRE), a century-old design undeveloped due to insufficient manufacturing capabilities (until recently). Geometric relationships are derived and mathematical models are generated to determine the efficiency of the PRE as a function of design variables. Two industrially relevant case studies show that, to maximize isentropic efficiency, the planetary rotor expander (PRE) rotational frequency is maximized and rotor geometry optimized.


Spectral, Energy And Computation Efficiency In Future 5g Wireless Networks, Haijian Sun Aug 2019

Spectral, Energy And Computation Efficiency In Future 5g Wireless Networks, Haijian Sun

All Graduate Theses and Dissertations

Wireless technology has revolutionized the way people communicate. From first generation, or 1G, in the 1980s to current, largely deployed 4G in the 2010s, we have witnessed not only a technological leap, but also the reformation of associated applications. It is expected that 5G will become commercially available in 2020. 5G is driven by ever-increasing demands for high mobile traffic, low transmission delay, and massive numbers of connected devices. Today, with the popularity of smart phones, intelligent appliances, autonomous cars, and tablets, communication demands are higher than ever, especially when it comes to low-cost and easy-access solutions.

Existing communication architecture ...


Generalization Of Signal Point Target Code, Md Munibun Billah Aug 2019

Generalization Of Signal Point Target Code, Md Munibun Billah

All Graduate Theses and Dissertations

Detecting and correcting errors occurring in the transmitted data through a channel is a task of great importance in digital communication. In Error Correction Coding (ECC), some redundant data is added with the original data while transmitting. By exploiting the properties of the redundant data, the errors occurring in the data from the transmission can be detected and corrected. In this thesis, a new coding algorithm named Signal Point Target Code has been studied and various properties of the proposed code have been extended.

Signal Point Target Code (SPTC) uses a predefined shape within a given signal constellation to generate ...


Parametric Study Of Mixture Component Contributions To Compressive Strength And Impact Energy Absorption Capacity Of A High Strength Cementitious Mix With No Coarse Aggregate, Md. Abdullah Al Sarfin Aug 2019

Parametric Study Of Mixture Component Contributions To Compressive Strength And Impact Energy Absorption Capacity Of A High Strength Cementitious Mix With No Coarse Aggregate, Md. Abdullah Al Sarfin

All Graduate Theses and Dissertations

This research project has been undertaken to produce and characterize the behavior of High Strength Cementitious Mix (HSCM), which has considerably higher compressive strength compared to conventional concrete. Components of HSCM are cement, silica fume, sand, water, and high range water reducer. The material is tested for compressive strength and impact energy absorption capacity while the amount of above mentioned components are varied parametrically. The effect of these parameters are extensively studied and trends are reported. Finally, this research projects attempts to find correlations among compressive strength, compressive toughness, and impact toughness. Limitations of the experimental program are discussed and ...


Full-Pose Estimation And Tracking Control For A Multi-Rotor Aircraft Package Exchange, Trent P. Smith Aug 2019

Full-Pose Estimation And Tracking Control For A Multi-Rotor Aircraft Package Exchange, Trent P. Smith

All Graduate Theses and Dissertations

In this work, research to develop algorithms for a package exchange maneuver between two quad-rotor aircraft is presented. First, the development of tools used for this research is discussed. Second, a controller is designed that synchronizes the flight paths and motion of two quad-rotor robots. The controller is used to guide a designated follower quad-rotor to follow a leader aircraft’s position and orientation. The follower aircraft is equipped with a simple mechanical manipulator to compensate for limitations in the aircrafts maneuverability. finally, a sensor architecture study for relative navigation of Unmanned Aerial Vehicles (UAV) is presented. The architecture study ...


Multiple Imu Sensor Fusion For Suas Navigation And Photogrammetry, Matthew Givens Aug 2019

Multiple Imu Sensor Fusion For Suas Navigation And Photogrammetry, Matthew Givens

All Graduate Theses and Dissertations

Inertial measurement units (IMUs) are devices that sense accelerations and angular rates in 3D so that vehicles and other devices can estimate their orientations, positions, and velocities. While traditionally large, heavy, and costly, using mechanical gyroscopes and stabilized platforms, the recent development of micro-electromechanical sensor (MEMS) IMUs that are small, light, and inexpensive has led to their adoption in many everyday systems such as cell phones, video game controllers, and commercial drones. MEMS IMUs, despite their advantages, have major drawbacks when it comes to accuracy and reliability. The idea of using more than one of these sensors in an array ...


Optimization Of Biogas Production By Use Of A Microbially Enhanced Inoculum, Anna Doloman Aug 2019

Optimization Of Biogas Production By Use Of A Microbially Enhanced Inoculum, Anna Doloman

All Graduate Theses and Dissertations

A renewable energy source, biogas, comprises of methane (80%) and carbon dioxide (15%), and is a great alternative to the conventional fossil-based fuels, such as coal, gas and oil. Biogas is created during anaerobic biological digestion of waste materials, such as landfill material, animal manure, wastewater, algal biomass, industrial organic waste etc. A biogas potential from organic waste in the United States is estimated at about 9 million tons per year and technology allows capture of greenhouse gases, such as methane and carbon dioxide, into a form of a fuel. In the light of global climate change and efforts to ...


Spiderworms: Using Silkworms As Hosts To Produce A Hybrid Silkworm-Spider Silk Fiber, Ana Laura Licon Aug 2019

Spiderworms: Using Silkworms As Hosts To Produce A Hybrid Silkworm-Spider Silk Fiber, Ana Laura Licon

All Graduate Theses and Dissertations

Spider silk has received significant attention due to its fascinating mechanical properties. Given the solitary and cannibalistic behavior of spiders, spider silk farming is impractical. Unlike spiders, silkworms are capable of producing large quantities of a fibrous product in a manner mimetic to spiders, and there already exists an industry to process cocoons into threads and textiles for many applications. The combination of silk farming (sericulture), a millennia old practice, and modern advancements in genetic engineering has given rise to an innovative biomaterial inspired by nature; transgenic silkworm silk.

This project focuses on the creation of chimeric silkworm-spider silk fibers ...


Characterization Of Biofilms In A Synthetic Rhizosphere Using Hollow Fiber Root-Mimetic Systems, Michelle Bonebrake Aug 2019

Characterization Of Biofilms In A Synthetic Rhizosphere Using Hollow Fiber Root-Mimetic Systems, Michelle Bonebrake

All Graduate Theses and Dissertations

The area around a plant’s roots hosts a complex and diverse microbial community. This environment can include a large number of bacteria that live on the surface of the root and benefit from the nutrients that the roots exude into the soil. These microbes can in turn be beneficial to the plant by protecting the roots from harmful fungi or stressful environmental conditions such as drought. In this thesis, several root-mimetic systems (RMSs) were developed for the study and growth of plant-beneficial bacteria in the laboratory environment. The RMS uses a porous hollow fiber used in hemodialysis as a ...


Exploring The Capacity Of Bacteria For Natural Product Biosynthesis, Ozkan Fidan Aug 2019

Exploring The Capacity Of Bacteria For Natural Product Biosynthesis, Ozkan Fidan

All Graduate Theses and Dissertations

This dissertation is focused on exploring the potential of bacteria for the biosynthesis of natural products with the purposes of generating novel natural product derivatives and of improving the titer of pharmaceutically important natural products.

A wide variety of compounds from various sources have been historically used in the treatment and prevention of diseases. Natural products as a major source of new drugs are extensively explored due to their huge structural diversity and promising biological activities such as antimicrobial, anticancer, antifungal, antiviral and antioxidant properties. For instance, penicillin as an early-discovered antimicrobial agent has saved millions of lives, indicating the ...


Robust Resource Allocation To Secure Physical Layer Using Uav-Assisted Mobile Relay Communications In 5g Technology, Shakil Ahmed Aug 2019

Robust Resource Allocation To Secure Physical Layer Using Uav-Assisted Mobile Relay Communications In 5g Technology, Shakil Ahmed

All Graduate Theses and Dissertations

The unmanned aerial vehicles (UAVs) are also known as drones. Recently, UAVs have attracted the next generation researchers due to their flexible, dynamic, and cost-effective deployment, etc. Moreover, the UAVs have a wide range of application domains, such as rescue operation in the remote area, military surveillance, emergency application, etc. Given the UAVs are appropriately deployed, the UAVs provide continuous and reliable connectivity, on-demand, and cost-effective features to the desired destination in the wireless communication system. Thus, the UAVs can be a great choice to deploy as a mobile relay in co-existence with the base stations (BSs) on the ground ...


Design Of Capacitive Wireless Power Transfer Systems With Enhanced Power Density And Stray Field Shielding, Ujjwal Pratik Aug 2019

Design Of Capacitive Wireless Power Transfer Systems With Enhanced Power Density And Stray Field Shielding, Ujjwal Pratik

All Graduate Theses and Dissertations

Wireless power transfer is becoming relevant today because of its effectiveness and convenience. It has been employed into consumer electronics such as cellular charging and electric vehicle charging. In general, inductive wireless power transfer (IPT) is mostly used for WPT. IPT requires coils and power transfer enhancing material such as ferrite to transfer power. However, Capacitive wireless Power Transfer (CPT) appears as an alternative because it requires cost effective and light metal plate couplers. Among CPT couplers, Vertical (stacked) Four-Plate Coupler (V4PC) structure offers the advantage of higher input and output self-capacitances, rotational misalignment.

Safety is one of the most ...


Revamping Timing Error Resilience To Tackle Choke Points At Ntc, Aatreyi Bal May 2019

Revamping Timing Error Resilience To Tackle Choke Points At Ntc, Aatreyi Bal

All Graduate Theses and Dissertations

The growing market of portable devices and smart wearables has contributed to innovation and development of systems with longer battery-life. While Near Threshold Computing (NTC) systems address the need for longer battery-life, they have certain limitations. NTC systems are prone to be significantly affected by variations in the fabrication process, commonly called process variation (PV). This dissertation explores an intriguing effect of PV, called choke points. Choke points are especially important due to their multifarious influence on the functional correctness of an NTC system. This work shows why novel research is required in this direction and proposes two techniques to ...


Emerging Security Threats In Modern Digital Computing Systems: A Power Management Perspective, Rajesh Jayashankara Shridevi May 2019

Emerging Security Threats In Modern Digital Computing Systems: A Power Management Perspective, Rajesh Jayashankara Shridevi

All Graduate Theses and Dissertations

Design of computing systems — from pocket-sized smart phones to massive cloud based data-centers — have one common daunting challenge : minimizing the power consumption. In this effort, power management sector is undergoing a rapid and profound transformation to promote clean and energy proportional computing. At the hardware end of system design, there is proliferation of specialized, feature rich and complex power management hardware components. Similarly, in the software design layer complex power management suites are growing rapidly. Concurrent to this development, there has been an upsurge in the integration of third-party components to counter the pressures of shorter time-to-market. These trends collectively ...


Measuring Nitrogen Transformation In Wastewater Impacted Streams Using In-Situ Benthic Chambers, Makenzi Beltran May 2019

Measuring Nitrogen Transformation In Wastewater Impacted Streams Using In-Situ Benthic Chambers, Makenzi Beltran

All Graduate Theses and Dissertations

Acrylic chambers and metal frames were installed at the sediment-water interface of streams impacted by the effluent from wastewater reclamation facilities in order to determine nitrogen rates for nitrification, denitrification, assimilation, ANAMMOX, and DNRA. Each chamber was dosed with an isotopic form of nitrate (15NO3 - ), and both isotopic (15N) and non-isotopic (14N) samples were collected. The project locations included East Canyon Creek near the East Canyon Wastewater Reclamation Facility in Park City, Utah and Box Elder Creek near the Brigham City Wastewater Treatment Plant in Brigham City, Utah. Separate chamber measurements were conducted upstream and downstream ...


The Impact Of Wood Biochar On The Plant Uptake Of Pharmaceuticals And Personal Care Products From Reclaimed Wastewater, Jeffrey Flashinski May 2019

The Impact Of Wood Biochar On The Plant Uptake Of Pharmaceuticals And Personal Care Products From Reclaimed Wastewater, Jeffrey Flashinski

All Graduate Theses and Dissertations

Reclaimed water (treated water discharged from wastewater treatment plants (WWTPs)) is increasingly used in drier regions for irrigation purposes. This effectively increases the water supply and reduces the amount of WWTP discharge into surface waters but it creates the potential for contaminants in the reclaimed water, such as pharmaceuticals and personal care products (PPCPs), to accumulate in exposed crops. The US Environmental Protection Agency (US EPA) considers PPCPs contaminants of emerging concern due to their near universal presence in the environment and their potential for endocrine disruption. Biochar is gaining attention as a soil amendment and could potentially be used ...


Estimating Suspended Solids And Phosphorus Loading In Urban Stormwater Systems Using High-Frequency, Continuous Data, Anthony A. Melcher May 2019

Estimating Suspended Solids And Phosphorus Loading In Urban Stormwater Systems Using High-Frequency, Continuous Data, Anthony A. Melcher

All Graduate Theses and Dissertations

The introduction of pavement, buildings, and other impervious surfaces to urban landscapes greatly influences the quantity and quality of urban stormwater runoff. In this study, we designed and implemented modern stormwater monitoring technologies to establish a “smart” stormwater sensor network within the Northwest Field Canal (NWFC), an urban water conveyance located in Logan, Utah, USA. This network was designed to collect flow and water quality data at high frequencies and simultaneously at multiple locations. The observatory’s innovative method of inter-site communication and changing sampling frequencies during storm events was able to capture short duration events at the upstream and ...