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Articles 2251 - 2280 of 196018

Full-Text Articles in Engineering

Integrating Remote Sensing Soil Water Balance And Time-Lapse Microgravity To Quantify A Groundwater Budget For The Greenfields Bench Aquifer, Montana, Tyler Storey May 2026

Integrating Remote Sensing Soil Water Balance And Time-Lapse Microgravity To Quantify A Groundwater Budget For The Greenfields Bench Aquifer, Montana, Tyler Storey

Honors Theses

The Greenfields Bench is an irrigation-sustained, shallow, unconfined gravel aquifer in Teton County, Montana, where irrigation modernization and canal operations affect groundwater recharge, storage, and discharge to drains and streams. This study integrates a 30 m remote sensing soil water balance in Google Earth Engine using OpenET evapotranspiration and gridded climate inputs (2020 to 2024) with a two-epoch time-lapse microgravity survey (July and November 2025), groundwater-level measurements, Greenfields Irrigation District operational records, and U.S. Geological Survey streamflow observations to quantify irrigation water partitioning and develop a groundwater budget. Microgravity paired with water level change yields provisional, high-uncertainty, effective specific yield …

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Hydrogen Engine For A Continuous Biochar Reactor, Andrew Woods May 2026

Hydrogen Engine For A Continuous Biochar Reactor, Andrew Woods

Honors Theses

A biochar reactor produces biochar, syngas, and bio-oil, which can be utilized for many useful products that are used in environmental remediation and power generation. The hydrogen that is captured from the syngas during the thermochemical gasification process opens the door to a unique opportunity to provide green energy from a biomass feedstock. The research aims to incorporate a single-cylinder, 10-hp engine that has been converted from gasoline to hydrogen fuel into a continuous biochar production reactor. This will play the role of power generation in a larger system that intends to mobilize biochar production. This study focuses on the …

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Hydrogeochemistry Of Natural Acid Rock Drainage In The Tobacco Root Mountains Of Southwest Montana And Implications For Restoration, Josie Grigsby May 2026

Hydrogeochemistry Of Natural Acid Rock Drainage In The Tobacco Root Mountains Of Southwest Montana And Implications For Restoration, Josie Grigsby

Honors Theses

This study investigates the hydrogeochemistry of the East Fork of the South Boulder River (EFSBR) in the northern Tobacco Root Mountains, Madison County, Montana. The upper 5 km of the main stem of the EFSBR is acidic (pH < 5.5), and dissolved concentrations of several trace metals including Al, Cd, Cu, and Zn exceed chronic aquatic life standards by 2-3 orders of magnitude. Unsurprisingly, the EFSBR appears to be devoid of trout. Since no mining has taken place at the source areas of the acidic headwater streams, this phenomenon is referred to as Natural Acid Rock Drainage (NARD). High mountains (up to 10,500’) bounding the EFSBR valley harbor a number of potential small rock glaciers and other periglacial features that appear to influence the hydrogeology and chemistry of the watershed. The steady flow of cold water in the hot summer months, during the same time period that neighboring drainages are drying up, is hypothesized to be sourced from melting ground ice high in the headwater catchment. Additionally, rock glaciers can act as efficient chemical reactors where they exist in conjunction with acid-generating mineralized bedrock, affecting the severity of acidic drainage and associated metal concentrations. Neutralization of the acidic water by alkaline tributaries results in the precipitation of aluminum hydroxysulfate (basaluminite), which covers the streambed with a vivid white mineral coating and can act as a natural sink through adsorption of other toxic metals to its surface. Pristine catchments exhibiting NARD can provide water quality data and serve as reference sites for restoration projects at sites experiencing Acid Mine Drainage where historical data does not exist. As climate change continues to alter the natural environment, especially in polar and high elevation regions, severity and instances of NARD are predicted to continue to increase on a global scale. A deeper understanding of the processes driving NARD from studies focused on areas such as the EFSBR will provide guidance for protecting vulnerable aquatic ecosystems and managing water resources in mountain communities into the future, as well as insights into necessary changes to established remediation methods in watersheds experiencing acid mine drainage.

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Modification And Characterization Of Bacterial Cellulose Membranes For The Potential Removal Of Various Contaminants From Water, Madison Skeel May 2026

Modification And Characterization Of Bacterial Cellulose Membranes For The Potential Removal Of Various Contaminants From Water, Madison Skeel

Honors Theses

Bacterial cellulose (BC) has emerged as a promising bio-based material for membrane filtration due to its high purity, interconnected nanofibrillar structure, and tunable physical properties. However, unmodified BC membranes function primarily as passive filtration materials, with performance largely governed by pore size and lacking the ability to effectively interact with dissolved contaminants. This study investigates the modification of BC membranes through a combination of mechanical pressing, chitosan functionalization, and citric acid crosslinking to enhance both structural control and functional performance. BC membranes were synthesized using a kombucha-based system and subsequently purified, mechanically compressed, and chemically modified. Results demonstrated that the …

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The Pebble In The Shoe, Marcos Fernandez Tous May 2026

The Pebble In The Shoe, Marcos Fernandez Tous

The Cicadian

This piece offers an introspective reflection by an educator at the University of North Dakota, blending phenomenological perspectives on the nature of education with the embodied experience of participating in a sweat lodge. Framed by a meandering walk across campus, the narrative interweaves several thematic threads: the tension between clarification and explanation, the values that should guide technology education, and the role of nature with its inherent, chaotic vitality. Although the text adopts a stream‑of‑consciousness approach, it does so without leaning on the established stylistic traditions of Proust, Joyce, or Faulkner. The work is also poetic in tone, suggesting that …

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Synthesis And Investigation Of Tungsten–Copper Oxide Composites For Enhanced Photocatalytic Applications, Janak Paudel, John Nichols May 2026

Synthesis And Investigation Of Tungsten–Copper Oxide Composites For Enhanced Photocatalytic Applications, Janak Paudel, John Nichols

Research and Creative Works Expo

No abstract provided.

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Behavioral And Biomechanical Analysis Of Hand Movement Stability In Virtual Reality, M. J. M. Sunny, Dr. Aryabrata Basu May 2026

Behavioral And Biomechanical Analysis Of Hand Movement Stability In Virtual Reality, M. J. M. Sunny, Dr. Aryabrata Basu

Research and Creative Works Expo

This research investigates fine motor control in virtual reality (VR) using a buzz-wire style precision task. Participants guide a loop along a wire while motion telemetry captures hand stability and movement patterns. Results show that individuals with combined VR, gaming, and athletic experience demonstrate smoother trajectories and reduced jitter, highlighting how prior expertise influences performance in immersive motor tasks.

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Brine Solidification And Metals Sequestration Using Lignocellulosics, Frank Kvietok May 2026

Brine Solidification And Metals Sequestration Using Lignocellulosics, Frank Kvietok

World of Coal Ash Proceedings

Coal ash has historically been used as a convenient, on-site solidification material for brines generated from flue gas desulfurization at power plants. As alternate utilization scenarios are developed for coal ash, lignocellulosic (wood-based) sorbents can serve as a highly efficient substitute for the solidification process. Results will be shared for a variety of different brine types: thermally reduced, thermally reduced and neutralized, and reverse osmosis. In addition to solidification performance, which demonstrated a 3-4x mass of liquid vs mass of sorbent factor, studies were conducted to quantify the strength of binding to the wood-based sorbent for a broad range of …

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Practical Guidelines For Pump Testing Of Ccr: Workflow, Design, And Lessons Learned., Nathanial Keller, Brian Hennings, Vic Modeer, Katie Moran May 2026

Practical Guidelines For Pump Testing Of Ccr: Workflow, Design, And Lessons Learned., Nathanial Keller, Brian Hennings, Vic Modeer, Katie Moran

World of Coal Ash Proceedings

This session presents a streamlined approach for pump testing of coal combustion residuals (CCR) to maximize hydraulic information with limited well installations, variable pumping rates, and short tests. Pre-test forward modeling identifies well offsets (typically 5–10 ft) and test durations (~2–6 hours) to yield measurable and analyzable drawdown at observation wells despite low pumping rates. Field execution consists of short step-drawdown testing to evaluate well specific capacity and select pumping rates for a constant rate test with one or more observation wells. Test results facilitate analysis of transmissivity and storativity of the CCR. Applied at two Midwestern sites with different …

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Simplified Approximate Procedure For Assessing The Implications Of Updated Usgs Seismic Hazard Models On Seismic Stability Assessments Of Ccr Impoundment Facilities, Nick Mcclung, Matt Bishop, Adrian Pena-Iguaran, Seda Gokyer-Erbis May 2026

Simplified Approximate Procedure For Assessing The Implications Of Updated Usgs Seismic Hazard Models On Seismic Stability Assessments Of Ccr Impoundment Facilities, Nick Mcclung, Matt Bishop, Adrian Pena-Iguaran, Seda Gokyer-Erbis

World of Coal Ash Proceedings

Selection of appropriate seismic design ground motions remains a key challenge for seismic stability assessments of coal combustion residual (CCR) impoundment facilities, particularly where regulatory guidance does not specify a required hazard model. This paper examines the implications of using Uniform Hazard Spectra (UHS) derived from the 2014 versus the 2018 U.S. Geological Survey (USGS) National Seismic Hazard Model (NSHM) for seismic amplification and stability evaluations of the Tennessee Valley Authority (TVA) Widows Creek Fossil (WCF) Plant CCR Management Units. The 2018 NSHM incorporates updated understanding of seismicity in the central and eastern United States and generally predicts higher ground …

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Before The Limit Hits: Lessons From A Proactive Construction Air Monitoring Program, Brian Egan, Nicholas Golden, Wendy Depp May 2026

Before The Limit Hits: Lessons From A Proactive Construction Air Monitoring Program, Brian Egan, Nicholas Golden, Wendy Depp

World of Coal Ash Proceedings

This presentation describes a comprehensive air monitoring program designed to protect workers and nearby neighborhoods during ash pond closure work. The program uses three main components: project (or boundary) monitoring at the site perimeter to track dust near the project boundaries, work area monitoring placed near active construction zones, and personal sampling on individual workers at regular intervals. Together, these approaches provide data on both community impacts and worker exposures, helping the team respond quickly when levels approach action limits. The Teams actions prior to exceedance of regulatory limits has helped prevent exposures. The talk will explain how monitors are …

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Integrating Advanced Geochemical Workflows With Modern Statistical Tools To Improve The Decision-Making Process At Ccr Sites, A Case Study, Glenna Thomas May 2026

Integrating Advanced Geochemical Workflows With Modern Statistical Tools To Improve The Decision-Making Process At Ccr Sites, A Case Study, Glenna Thomas

World of Coal Ash Proceedings

While statistical assessment provides the foundation for CCR compliance reporting, incorporating a holistic geochemical framework transforms statistics from a compliance requirement into a powerful predictive tool. Strategic geochemical insight established the basis of understanding needed to support successful statistical approaches and to ensure that statistical outcomes reflect actual groundwater behavior. Whether it is trend analysis, delineating source mechanism, or updating geochemical conceptual site models (GCMs), geochemical context provides the technical foundations for statistical outputs and methods. A continuously refined GCSM enhances the ability to anticipate how groundwater chemistry should evolve, improving interpretation and predictive capability. This allows practitioners to understand …

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Monitored Natural Attenuation Evaluation And Additional Characterization Of A Ccr Unit Lithium Groundwater Plume, Matt Barickman, Adam Piestrzeniewicz Pg May 2026

Monitored Natural Attenuation Evaluation And Additional Characterization Of A Ccr Unit Lithium Groundwater Plume, Matt Barickman, Adam Piestrzeniewicz Pg

World of Coal Ash Proceedings

Monitored Natural Attenuation (MNA) refers to the reliance on natural attenuation processes (within the context of a carefully controlled and monitored site cleanup approach) to meet groundwater protection standards (GPS) for a CCR unit within a reasonable time frame (USEPA, 1999). MNA is being evaluated as an adaptive management strategy for a CCR unit groundwater plume with statistically significant lithium concentrations above GPS, though with little risk of offsite migration. A previous MNA evaluation was performed for the lithium plume following the United States Environmental Protection Agency (USEPA) “tiered lines of evidence approach” (USEPA, 2015), which determined that there were …

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Establishing Groundwater Monitoring Systems Under The Legacy Rule: A Systematic Approach For Utilities, Chris Hoglund May 2026

Establishing Groundwater Monitoring Systems Under The Legacy Rule: A Systematic Approach For Utilities, Chris Hoglund

World of Coal Ash Proceedings

The USEPA’s Legacy CCR Rule introduces new requirements for establishing groundwater monitoring systems at Legacy Surface Impoundments (LSIs) and Coal Combustion Residual Management Units (CCRMUs). These requirements present unique challenges for electric utilities, particularly at inactive or historically operated facilities where subsurface data are limited and CCR units may have nontraditional configurations such as linear roadways, elongated embankments, or distributed disposal areas. Utilities must also determine how best to apply single-unit or multi-unit monitoring approaches, integrate newly regulated units into existing monitoring networks, and align monitoring system design with planned closure strategies. This presentation outlines a systematic, defensible framework to …

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Risk Evaluation Of Linear Coal Combustion Residual Management Unit (Ccrmu) Fills, Qian Zhang, Andrew Bittner, John Kondziolka, Masoud Arshadi May 2026

Risk Evaluation Of Linear Coal Combustion Residual Management Unit (Ccrmu) Fills, Qian Zhang, Andrew Bittner, John Kondziolka, Masoud Arshadi

World of Coal Ash Proceedings

In 2024, the US Environmental Protection Agency (US EPA) established new regulations for coal combustion residual management units (CCRMUs), defined as coal combustion residual (CCR) deposits placed on power plant properties outside of landfills or surface impoundments. US EPA supported the rulemaking with modeling-based risk analyses and established regulatory requirements based on fill size. Linear CCRMU, such as backfill along pipelines or haul roads, have individual segments that may be composed of a small amount of mass below the threshold for regulation, but the cumulative mass over the full linear feature extent may exceed regulatory thresholds. This study applies US …

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Application Of Mine Tailings Flow Failure Assessment On Ccr, Zachary Fallert May 2026

Application Of Mine Tailings Flow Failure Assessment On Ccr, Zachary Fallert

World of Coal Ash Proceedings

A new geotechnical stability analysis method has been implemented for a CCR surface impoundment to aid in design for temporary cut slopes and final closure grades. Conditions have come to light after significant tailings dam failures occurred across the globe, specifically those exhibiting flow failures (i.e. failures in which tailings behave a liquid and flow out of the facility). These failures have come under intense scrutiny as the failures pose significant risk to public safety and the environment and have been observed in CCR. Additionally, static liquefaction has arisen as another potential but less well understood causative mechanism. As the …

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Lessons Learned: Commissioning An Fgd Wastewater Treatment System, Bella Triolet, Mckale Grant, Louis Manigault May 2026

Lessons Learned: Commissioning An Fgd Wastewater Treatment System, Bella Triolet, Mckale Grant, Louis Manigault

World of Coal Ash Proceedings

Stantec recently supported commissioning a flue gas desulfurization (FGD) Wastewater Treatment System in accordance with the 2020 Environmental Protection Agency (EPA) Effluent Limitations Guidelines (ELG) Rule, which requires that coal fired power plants meet their more stringent requirements by December 31, 2025. With the addition of the 2024 EPA ELG Rule, coal fired power plants will now be expected to move to zero liquid discharge (ZLD) systems or permanently cease coal combustion by 2034. Due to this change, it is likely that coal fired power plants will be looking to design and install ZLD systems within the next decade. While …

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Risk Evaluation Of Linear Coal Combustion Residual Management Unit (Ccrmu) Fills, Qian Zhang, Andrew Bittner, John Kondziolka, Masoud Arshadi May 2026

Risk Evaluation Of Linear Coal Combustion Residual Management Unit (Ccrmu) Fills, Qian Zhang, Andrew Bittner, John Kondziolka, Masoud Arshadi

World of Coal Ash Proceedings

In 2024, the US Environmental Protection Agency (US EPA) established new regulations for coal combustion residual management units (CCRMUs), defined as coal combustion residual (CCR) deposits placed on power plant properties outside of landfills or surface impoundments. US EPA supported the rulemaking with modeling-based risk analyses and established regulatory requirements based on fill size. Linear CCRMU, such as backfill along pipelines or haul roads, have individual segments that may be composed of a small amount of mass below the threshold for regulation, but the cumulative mass over the full linear feature extent may exceed regulatory thresholds. This study applies US …

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Site Characterization, Design, Permitting, And Construction For Clean Closure Of A Small But Challenging Legacy Ccr Disposal Impoundment, John Garten, Bob Baker, Lee Lenhart May 2026

Site Characterization, Design, Permitting, And Construction For Clean Closure Of A Small But Challenging Legacy Ccr Disposal Impoundment, John Garten, Bob Baker, Lee Lenhart

World of Coal Ash Proceedings

The Lay of Land Area (LOLA) is a 10-acre (40,468 square meters) legacy disposal impoundment containing approximately 55,000 cubic yards (42,000 cubic meters) of sluiced coal combustion residuals (CCRs) produced during startup operations of a former fossil plant. Most of its perimeter is bounded by water, with a river to the north and a cooling water lake to the south. The entire area lies within a 100-year floodplain, is heavily forested, and groundwater is typically encountered within a few feet of the existing ground surface. As part of an overall CCR closure-by-removal and ash beneficiation program, planning, design, permitting, and …

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Trimble County Pond Closures, Steven Turner, Shanti Montgomery May 2026

Trimble County Pond Closures, Steven Turner, Shanti Montgomery

World of Coal Ash Proceedings

The Trimble County Closure Project is a 5-year project to close the 40-acre (161,900 square meters) Gypsum Storage Pond (GSP) through closure-by-removal and the 100-acre (404,700 square meters) Bottom Ash Pond (BAP) through closure-in-place in accordance with coal combustion residual (CCR) Rule. The excavated gypsum from the GSP was “Beneficially Reused” to fill the BAP to the prescribed grade for drainage through a monitored outfall to the adjacent creek. The daily plant produced CCRs of fly ash, bottom ash, and gypsum were also used for four years to supplement the filling of the BAP as well as several onsite soil/rock …

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Green Infrastructure As A Strategy For Revitalizing Old Residential Neighborhoods: Evaluation Of Carbon Footprint And Energy Performance - Case Study Of Heliopolis, Cairo, Ahmad Abouisaadat, Eman Gameel, Shoroq Adel May 2026

Green Infrastructure As A Strategy For Revitalizing Old Residential Neighborhoods: Evaluation Of Carbon Footprint And Energy Performance - Case Study Of Heliopolis, Cairo, Ahmad Abouisaadat, Eman Gameel, Shoroq Adel

Mansoura Engineering Journal

This study aims to address the challenge of reducing energy consumption and greenhouse gas (GHG) emissions in urban areas, particularly in aging residential neighborhoods. Despite the benefits of Urban Green Infrastructure (UGI) and residential retrofitting, current research often examines these strategies separately, leaving a gap in understanding their combined impact at the district scale. The research proposes a methodology that integrates GIS-based spatial analysis, Urban Building Energy Modeling (UBEM), and Life Cycle Assessment (LCA) to evaluate the effects of UGI (e.g., green roofs, urban trees) and retrofitting strategies on energy use, CO2 reduction, and urban microclimates. The study will provide …

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Dewatering System Operations And Modeling Of A Bottom Ash Ccr Surface Impoundment, Craig Schuettpelz, Todd Stong, Ben Sieren May 2026

Dewatering System Operations And Modeling Of A Bottom Ash Ccr Surface Impoundment, Craig Schuettpelz, Todd Stong, Ben Sieren

World of Coal Ash Proceedings

Dewatering of coal combustion residual (CCR) surface impoundments is a technically challenging item for sites with CCR units at closure. Generation has ceased at this site where fly ash was mostly sold for beneficial use and bottom ash was sluiced to composite-lined CCR surface impoundments to passively drain prior to landfilling. During site closure and restoration, bottom ash and relatively minor amounts of other permitted waste materials were consolidated into the site’s landfill and bottom ash impoundment. The bottom ash impoundment entered closure 5 years ago with installation of a final cover system and construction of a sump to allow …

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Building Better Partnerships: Design-Build Lessons From The Ash Pond Closure Front Lines, Brian Egan, Nicholas Golden, Mark Edlebeck May 2026

Building Better Partnerships: Design-Build Lessons From The Ash Pond Closure Front Lines, Brian Egan, Nicholas Golden, Mark Edlebeck

World of Coal Ash Proceedings

This presentation shares lessons learned on an ash pond dig-and-haul project delivered by a design-build team with CTI providing engineering and Fisher Contracting delivering construction services. CTI and Fisher Contracting will discuss how they formed their partnership, what makes a good teaming arrangement work, and the challenges that come with working closely together. This team has worked side by side from early design through construction, which has helped cut costs and keep the project on schedule. The talk will show how the partners divide tasks, then adjust roles as needed instead of locking into a fixed plan. In some cases, …

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Illinois Coal Ash Impoundment Assessment, Randy Locke May 2026

Illinois Coal Ash Impoundment Assessment, Randy Locke

World of Coal Ash Proceedings

Coal combustion residuals (CCR) present one of the most significant waste management challenges in the United States. Illinois hosts 72 coal ash impoundments at 23 facilities across 22 counties. In 2019, the state enacted Public Act 101 0171 (Coal Ash Pollution Prevention Act), followed by Illinois Administrative Code Title 35, Part 845, establishing CCR surface impoundment standards. Even with federal and state requirements, significant gaps remain in identifying management options and site-specific risks. Key limitations include: (1) incomplete understanding of ash composition and variability within and among impoundments; and (2) fragmented information on impoundment physical properties, operational status, and geological …

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Response Surface Modelling And Multi-Objective Optimisation Of Asphalt Binder And Mixture Properties Modified With Reclaimed Automotive Lubricants And Waste Glass Bottle Powder, Nura Shehu Aliyu Yaro, Jacob Adedayo Adedeji, Luvuno Nkosinathi Jele, Nasir Khan, Aliyu Usman, Jacob Olumuyiwa Ikotun May 2026

Response Surface Modelling And Multi-Objective Optimisation Of Asphalt Binder And Mixture Properties Modified With Reclaimed Automotive Lubricants And Waste Glass Bottle Powder, Nura Shehu Aliyu Yaro, Jacob Adedayo Adedeji, Luvuno Nkosinathi Jele, Nasir Khan, Aliyu Usman, Jacob Olumuyiwa Ikotun

Journal of Sustainable Construction Materials and Technologies

Large volumes of reclaimed automotive lubricant (RAL) and waste glass bottle powder (WGBP) are disposed of inappropriately, causing serious environmental concerns. Furthermore, the paradigm shift towards sustainability in the pavement industry has prompted academics to investigate alternatives to conventional materials. As a result, one possible approach is to use these waste products as alternative materials in the asphalt pavement sector. This study investigated the combined use of RAL and WGBP as complementary modifiers, extending beyond the conventional single-modifier approaches reported in previous studies. Thus, in this study, response surface methodology (RSM) was utilised to optimise and predict the synergistic effects …

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Collins Aerospace Automated Pressure Switch Tester, Joseph C. La Barbera, Kevin Cordero, Brenda Sanchez, Molly Bramm May 2026

Collins Aerospace Automated Pressure Switch Tester, Joseph C. La Barbera, Kevin Cordero, Brenda Sanchez, Molly Bramm

Honors Capstones

For aerospace companies like Collins, pressure switches are crucial for safety, precise control, and reliability. As such, thorough testing of these switches is an essential step in Collins’ manufacturing workflow. However, current testing regimes suffer from several critical drawbacks. Firstly, they require constant manual supervision, costing precious time and manpower. Existing systems are also only able to test one single switch at a time, which creates backlog and delays. Lastly, current testing equipment has poor integration with the Collins digital ecosystem, hindering the utility of these devices. To solve these design challenges, a new system is required that is self-operable, …

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Lunar Regolith Sintered Brick Apparatus, Andrew Fasano, Noah Parayil, Darius Felix Karra May 2026

Lunar Regolith Sintered Brick Apparatus, Andrew Fasano, Noah Parayil, Darius Felix Karra

Senior Design Project For Engineers

This project describes the preliminary design and analysis of the Semi-Autonomous Lunar Regolith Sintered Brick Apparatus that will assist in developing permanent infrastructure on the Moon. An issue with permanent lunar operations is the transportation of materials to the Moon. To address this, the designed device uses lunar regolith as the source material for producing bricks. This design considers the constraints set for operation with the Griffin lunar lander: maximum payload mass of 200 kg, power consumption below 5 kW, and limited payload dimensions. The design uses a combination of a laser sintering motion system, a regolith layering subsystem, a …

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Stabilized Cargo Relay Aircraft For Precision Payload Yielding, Dato A. Tabidze, Michael Conely, Ben Courtney May 2026

Stabilized Cargo Relay Aircraft For Precision Payload Yielding, Dato A. Tabidze, Michael Conely, Ben Courtney

Senior Design Project For Engineers

As military missions become more complicated, warfighters need more capable drones to use across diverse scenarios. The same also applies to civilian applications, like infrastructure inspection, package delivery, and disaster response. Current multirotor drones, also known as unmanned aircraft systems (UAS), provide simplicity, affordability, and ease of operation; however, their primary limitation is their low payload-to-weight ratio, which typically falls at 1:1 or less. The DARPA Lift Challenge aims to shatter the heavy lift bottleneck, seeking novel drone designs that can carry payloads more than four times their weight, which would revolutionize the way we use drones across all sectors. …

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Quantitative Assessment Of Cybersecurity Risk Variability Across Transportation Modes, Paulo Carreon May 2026

Quantitative Assessment Of Cybersecurity Risk Variability Across Transportation Modes, Paulo Carreon

Doctoral Dissertations and Master's Theses

Transportation systems are increasingly dependent on digital technologies, networked communications, and cyber-physical integration, making cybersecurity an important issue for operational continuity, resilience, and safety. Although cybersecurity risks in transportation are widely recognized, much of the existing research remains mode-specific and lacks a standardized quantitative framework for comparing risk across transportation systems. This study develops a quantitative, incident-based approach for assessing cybersecurity risk variability across four major transportation modes: Aviation, Maritime, Rail, and Road. The study is based on a manually constructed dataset of 189 publicly reported transportation cybersecurity incidents collected from 2000 to 2025. Each incident was coded into structured …

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Testing And Qualification Of Low-Voltage Power Supplies For The Atlas Tile Hadronic Calorimeter Phase-Ii Upgrade, Justice A. Jones May 2026

Testing And Qualification Of Low-Voltage Power Supplies For The Atlas Tile Hadronic Calorimeter Phase-Ii Upgrade, Justice A. Jones

2026 Spring Honors Capstones Projects

The High Luminosity upgrade of the Large Hadron Collider (HL-LHC) places increased thermal and operational demands on detector electronics, requiring highly reliable power systems. The ATLAS Tile Hadronic Calorimeter (TileCal) uses low-voltage power supply (LVPS) bricks to power front-end electronics, but these units operate in inaccessible regions, making failures difficult to repair. Therefore, rigorous qualification procedures are essential. This work focuses on improving LVPS reliability through a structured burn-in process. Each unit undergoes pre-burn-in electrical verification using a Single Test Stand (STS), followed by sustained operation under load and elevated temperature, and post-burn-in requalification. Standard cooling conditions limit temperatures to …

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