Engineering Commons^™

Land-Use Intensity Of U.S. Wastewater Treatment Facilities By Secondary Process, Robert B. Sowby, Chandler W. Johnson

ScholarsArchive Data

1. Excel workbook of sample data

2. Shapefile of sample site

3. Shapefile of site areas

Effects Of Prescribed Burning On Forest Soil Low-Molecular-Weight Organic Acids, Ariana Rivera-Anazco

Honors Theses

Low-molecular-weight organic acids (LMWOAs) play important roles in nutrient mobilization, microbial activity, and carbon cycling in forest soils, yet their response to prescribed fire and thinning remains poorly understood. This thesis examined whether thinning and prescribed burning altered extractable LMWOA in O-horizon soils from the Lubrecht Experimental Forest. The study focused on lactic, propionic, glycolic, acetic, and formic acids measured in soils collected immediately before and approximately two weeks after the 2024 prescribed burn across four treatment categories: control, burn, thin, and thin+burn. The managed plots belong to a long-term experiment first treated in 2001-2002, whereas the control remained unmanaged …

Optimizing Copper Slag As A Sustainable Precursor For Iron Phosphate Cement: Hydration Mechanism, Phase Transformation, And Environmental Safety, Wei Wang, Hongyan Ma, Xiunan Cai, Dan Luo, Zhicheng Xu, Zhongqiu Luo, Xintao Zhou

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Iron-rich copper slag (CS) has significant potential as a precursor for the synthesis of sustainable acid-base cement (AB). However, the roles and transformation behaviors of the diverse iron phases in CS during hydration remain unclear. In this study, the preparation conditions, early hydration behavior, transformation processes of iron components, and environmental safety of CS-based iron phosphate cement (CS-IPC) were systematically investigated. Under optimized conditions, with a CS/ADP mass ratio of 3.0 and a grinding time of 1.5 h, CS-IPC exhibited an initial setting time of 27.6 min and a flowability of approximately 159 mm. After curing for 3 and 28 …

Beyond Accuracy: Machine Learning Models For Predicting Presence Of Permanent Molar Caries In U.S. Children And Adolescents With Fairness Consideration, Pritam Deb, Lin Li, Christina R. Scherrer

Faculty Articles

Background

Although predictors of dental caries have been previously explored, a comprehensive understanding of factors influencing permanent‐molar decay in U.S. children and adolescents, especially with respect to racial and ethnic biases remains limited. This study aims to develop and evaluate machine‐learning (ML) models incorporating algorithmic fairness to predict caries in permanent molars.

Methods

Data from the National Health and Nutrition Examination Survey (NHANES) were analyzed, using the 2011–2014 cycles for training and validation and the 2015–2016 cycle for testing. The primary outcome was decayed, missing, and filled teeth (DMFT) in at least one permanent molar, dichotomized to represent the presence …

Radio Frequency Resonate And Fire (Rf-Raf) Neurons Supporting Device Classification, David L. Weathers, Michael A. Temple, Brett J. Borghetti

Faculty Publications

Radio Frequency Fingerprinting (RFF) enables passive physical-layer device authentication by exploiting unintentional hardware variations in wireless transmitters. Neuromorphic implementations are attractive, given their potential for low-latency, energy-efficient inference capability under Size, Weight, and Power (SWaP) constraints at the edge. A new RFF capability is demonstrated here using recently introduced Radio Frequency Resonate-and-Fire (RF-RAF) neurons and eight WirelessHART devices. Performance is evaluated for RF-RAF-generated fingerprints against the established Gabor Transform (GTX) baseline using three classifier architectures: Random Forest (RndF), Convolutional Neural Network (CNN), and a Time-Incremented Spiking Neural Network (TI-SNN). The results show that RF-RAF fingerprints achieve an average classification accuracy …

Waste Wood Biochar As A Potential Agricultural Soil Amendment, Gavin Rahl

Honors Theses

Biochar, as a technology, has and continues to be evaluated for a wide variety of purposes including drinking water treatment of heavy metals and air filtration for harmful contaminants. When evaluating the logging industry, a problem has emerged around residual wood waste (slash piles) in the field that biochar production may be able to address. Additionally, agriculture has begun to look for alternatives to nitrate heavy fertilizers that can cause eutrophication in waterways that biochar has the potential to address. In this study, the effect of biochar addition was assessed in agricultural fields with tight margin alfalfa/grass hay crops to …

Geochemistry And Occurrence Of Rare Earth Elements In Mine-Impacted And Natural Waters Of Montana, Matthew Vitale

Honors Theses

The occurrence and geochemical behavior of rare earth elements (REEs) in mine-impacted and natural waters of Montana are evaluated across a range of environments, including hard rock mining-impacted systems, coal-associated waters, and naturally occurring acid rock drainage (NARD). Understanding the abundance of REEs in secondary sources such as mine-impacted waters is critical for both environmental assessment and resource recovery. A comprehensive dataset of dissolved and total recoverable REE concentrations was analyzed to assess the influence of pH, total dissolved solids, and geologic setting on REE mobility and distribution. Results demonstrate a strong inverse relationship between pH and REE concentrations, with …

Analysis Of Rare Earth Element Enrichment In The Phosphoria Formation, Southwest Montana, Nicholas Risedorf

Honors Theses

The Phosphoria Formation is a world-class phosphate-producing paleobasin in the Rocky Mountains. It has produced over 230 Mt of commercial phosphate since the 1920s. Rare earth element (REE) mineralization in phosphorite was observed historically, but commercial recovery of REEs has not been reported. Increasing demand for domestic REE supply has made resource characterization a priority. This study investigates the distribution of REEs within the Phosphoria Formation across southwest Montana. Five sections of Retort Member from the Phosphoria were exposed to measure stratigraphy and collect samples for geochemical analysis. Historic mine sites and prospects were also visited to collect and analyze …

Design Optimization Of Active-Stabilizing Canards For High-Powered Rockets, Simon Babcock

Senior Honors Theses

Rocket canards are a common means of stabilizing a high-powered rocket in flight by producing aerodynamic forces to correct the rocket's trajectory. The size, shape, and position of the canards relative to the rocket body determine their control effectiveness and aerodynamic efficiency – two objectives of canard design with an inverse relationship to each other. By integrating automated iterative rocket trajectory simulation with adaptive surrogate modelling, this research optimized the canard planform geometry for a high-powered rocket to maximize the canards’ control effectiveness and aerodynamic efficiency through multi-variable, multi-objective design optimization. The canard design was first parameterized into four design …

Modeling Individual Self-Protective Behavior During Epidemics, Geonsik Yu, Michael J. Garee, Mario Ventresca, Yuehwern Yih

Faculty Publications

Protecting public health from infectious diseases requires collective action, as individual behaviors—such as vaccination and mask-wearing—directly influence disease dynamics. During the COVID-19 pandemic, unexpected public responses often undermined the effectiveness of interventions, highlighting the need to understand collective behavioral patterns and motivations to design more effective mitigation strategies. This study presents an agent-based simulation model that captures how individuals adjust self-protective behaviors based on evolving opinions about disease risk and examines how these decisions interact with external factors, such as public health interventions, to shape collective outcomes. To improve the representativeness of the simulated population, multiple datasets were integrated to …

Energy Materials Health Monitoring With Interpretable Machine Learning, Osumanu Musah Mohammed

Honors Theses

Reliability and the lifecycle of energy materials have become key concerns for sustainable, decarbonized power systems [1]. More recent reports on photovoltaic (PV) device technologies, fuel cells, hydrogen storage, and novel composite materials have indicated that material deterioration is a constraint on large-scale exploitation and cost-effectiveness, rather than on energy conversion efficiency [2], [3]. The energy infrastructure of tomorrow needs to be smart and efficient; however, more to the point, it needs to be self-aware, self-diagnostic, and able to overcome any form of degradation before breaking down [4]. The US dilemma is also directly related to federal concerns. That is …

Recovering Sn From Ultrafine Tails At Mina San Rafael, Peru, Angelica Plenge

Honors Theses

San Rafael is currently the only mine producing tin (Sn) in Peru, operating two concentrators. In the first, called the San Rafael plant, tin concentrate is produced through gravity separation circuits consisting of jigs, spirals, and Mozley tables, followed by reverse flotation, where sulfides are floated while cassiterite (78.77% theoretical tin content) is depressed. Material containing tin values is then directed to a desliming circuit, where the pulp density is adjusted prior to sulfide reverse flotation. The tailings from this stage are subsequently processed through another flotation circuit but, in this case, the Sn is floated. Cycloning is applied throughout …

Topological Investigation Of Underground Mine Airflow Characteristics, Shadrack Nuamah

Honors Theses

Underground mine ventilation sustains safe working conditions by supplying fresh air, diluting contaminants, and controlling heat and humidity throughout active workings. Because air moves through a connected system of shafts, drifts, and raises, the ventilation problem is inherently one of network flow, and in large mines, that network can grow complex enough that standard simulation tools, while numerically reliable, leave engineers with little guidance on which circuits matter most, which redundancy is structurally meaningful, and where recirculation risk is concentrated. We address this gap by developing a physics-guided topological workflow that layers three complementary analyses: a physical graph filtration on …

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 …

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 …

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.

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 …

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 …

Inconsistencies Emerge Between Regional And Local-Scale Water Security Metrics At Military Installations, Abigail Birnbaum, Michael L. Berg, Caitlin Grady, Daniel J. Weeks, Christopher M. Chini

Faculty Publications

Recent United States federal policy for military installations has emphasized the importance of developing a standardized approach for water security assessment to monitor changes in water resources and the ability for an installation to meet both its civilian and mission needs. For military installations in the United States, these assessments must consider demands both inside and outside the installation’s fence line, as regional resources are required to meet mission readiness. Focusing on physical water scarcity, this study compares four water security metrics with unique formulations and spatial resolutions, including an installation-scale metric and multiple regional metrics defined for either baseline …

An Integrated Artificial Intelligence–Circular Economy Framework For Sustainable Industrial Waste Management System: Case Study From The Carpet Industry Supply Chain, Noha Mostafa

Mechanical Engineering

Waste management has become a critical issue in industry due to its environmental and  economic impact. This urges societies to move towards circular economy and sustainability in managing wastes to achieve economic, social and environmental benefits that cannot be achieved by using traditional disposal methods. Artificial intelligence technologies can play an effective role in developing systems and applications that help in realizing circular economy approaches. This research explores using circular economy in the carpet industry with a focus on being eco-friendly and achieving operational excellence. Circular economy aims to use resources efficiently within a reduce, reuse, recycle paradigm. Critical literature …

Evaluating Team Formation Strategies With Algorithms, Ethan E. Lopez, Andy Vo

Student Scholar Symposium Abstracts and Posters

Effective teamwork is essential for collaborative learning, yet forming compatible student groups remains a persistent challenge. This study explores how algorithmic team-building methods influence students’ social and academic compatibility overtime. To support this investigation, we designed a visual survey system called “The Disco Ball." Evaluating work ethics, lifestyles, behaviors, and communication styles, students were initially assigned to project teams using one of three conditions: (1) random assignment (control), (2) a “most matches” condition maximizing similarity between students, and (3) a “diverse communication styles” condition designed to balance differing interaction preferences. After an initial collaboration period, students were given the opportunity …

Phytomining Potential Of Native Rocky Mountain Plants, Halle Cogley

Honors Theses

Standard mining practices of the past have left valuable, critical minerals remaining within mine waste and tailings piles. Phytoremediation, or the use of plants to uptake and store heavy metals, has grown in popularity for these sites. A new technology, phytomining, is being developed that not only offers the benefits of phytoremediation but also allows a new pathway to extract and generate revenue from these untouched critical minerals. Certain plants have been identified as hyperaccumulators with the ability to bioaccumulate a high level of certain minerals in their plant tissue. This study explored different species of native plants within the …

Collector Blends For The Flotation Of Rare Earth Silicates, Padmore Fosu Amankwah

Honors Theses

Rare earth elements (REEs) are critical for modern technologies, but their extraction from minerals remains challenging due to various factors, and their impact on mineral bonding and resulting crystal structure. Fundamental studies have shown that the concentration of rare earth minerals (REMs), such as rare earth silicates (RES), depends on factors such as Lanthanide contraction (LC), Coordination Number (NC), and silicate polymerization (SP). These influence flotation responses pending silicate type (e.g., sorosilicates, phylosilicates, nesosilicates, inosilicates, orthosilicates, etc.). To better understand this behavior and optimize REE recovery, samples from Halleck Creek, an American Rare Earth property in Wyoming, were obtained. Characterization …

Monitoring Groundwater Flow At Old Works Using Anisotropy, 3-D Electrical Geophysics, And Dem-Based Terrain Analysis, Yihaun Gao

Honors Theses

Groundwater flow in shallow heterogeneous environments is often difficult to characterize using a single geophysical method. This study applies an integrated approach combining azimuthal resistivity anisotropy, self-potential (SP) measurements, DEM-derived terrain indices, and three-dimensional electrical resistivity tomography (3-D ERT) to delineate preferential groundwater pathways at the Old Works Golf Course in Anaconda, Montana. Azimuthal anisotropy analysis from eighteen 2-D ERT profiles revealed a dominant directional dependence in electrical conductivity, indicating a structural or sedimentological control on subsurface flow. The anisotropy results indicate a preferred conductivity direction of approximately 200°–210° in azimuth (0° is north), suggesting that groundwater movement is guided …

Rf Properties Of Military Radio Enclosures, Ethan Messner

Honors Theses

Ghost radios are used in a MANET setup by the 11th Airborne Division during operations in Alaska, however, the Ghost radios are limited by battery life and extreme cold temperatures. This work investigates the effects of different enclosures on the propagation characteristics of the Ghost radio. A testing setup was created to measure the S-parameters of a 2-port network in an open field to quantify the impact the enclosures will have on antenna gain. A finite element model of the final enclosure design was created in ANSYS HFSS to determine the effectiveness of adding an attachment onto the enclosure to …

Phytoextraction Potential Of Willows (Salix Spp.) For Common Heavy Metal Contaminants., Johannes Chandler

Honors Theses

Phytoextraction is a method for removal and recovery of heavy metals from contaminated substrates using plants. There is a growing need to test, identify, and further understand species effective for phytoextraction to feasibly remove and recover heavy metals. In this study, the phytoextraction capacity of Willow (Salix) species was tested for metal contaminated soils and waters from legacy mining in Butte, Montana. The willows were grown in a hydroponic system in two 8-week long growth trials, employing a 2x2 factorial design of contaminated soil, clay beads, contaminated mine water and uncontaminated water as the media. Heavy metal concentrations (Mn, Zn, …

Steel Corrosion In Underground Transportation Infrastructure, Amr M. Morsy, Islam A. Ebo, Shiv K. Janardhanan

Mineta Transportation Institute

Corrosion of buried steel, a critical component of American transportation infrastructure, remains one of the most insidious challenges due to the uncertainty associated with its estimates. Predicting when and how this corrosion happens is very difficult. This uncertainty grows exponentially with time, making corrosion estimation in the long term even more challenging, especially with buried steel and steel structures, which cannot even be monitored visually. While significant advancement has been made to understand the effect of the various corrosion parameters on soil corrosivity, there is a lack of a comprehensive understanding of how these factors collectively contribute to corrosion as …

Sit-To-Stand: Smart Physical Therapy Device Design Project, Mollie Petersen, Evie Collier, Gracie Kniss, Lucas Sokolik, Jacob Zitek

Honors Program: Senior Projects (Public)

Mechanical engineering students in their last year are provided with the opportunity to form a small group and design a product. The specific project covered in this report is the creation of a smart attachment to a physical therapy device. A sit-to-stand piece of equipment is used to help patients recover or build the strength to move from a sitting to standing position after an injury or illness. Currently, there is not a way for physical therapists to collect numerical data while a patient is using the equipment. Much of their care plans are built off of personal perception and …

Analysis Of Approximations In Flash Thermal Diffusivity Measurements Using High‑Fidelity Simulations, Tage T. Burnett, Jakob G. Bates, Matthew R. Jones, Christopher R. Dillon, John Tencer

Faculty Publications

Thermal diffusivity is an important material property for understanding and characterizing transient behavior in many heat transfer applications. This study investigates the accuracy and approximations of inverse mathematical models for measuring thermal diffusivity of materials via the widely used Flash Method. High-fidelity simulations of the Flash Method in copper, silicon carbide, silicon, and glass were performed as numerical experiments and included physics such as in-depth absorption, radial conduction, and surface convection. Data from those numerical experiments were used to estimate material thermal diffusivity using seven traditional and new inverse models. Parker’s original model had relative errors 𝜖< 5% when the approximations it makes were enforced in numerical experiments. Newer models performed well even when experimental restrictions were relaxed. Models that include radial heat conduction were capable of accurately measuring thermal diffusivity (𝜖< 1%) when a Gaussian energy source was used. Models with radial conduction and in-depth material absorption of the laser source could calculate thermal diffusivity for semi-transparent materials such as silicon (𝜖< 1%) and even transparent materials like glass (𝜖< 10%). Convective losses from the material’s front surface had a negligible impact on measurements except for very low thermal diffusivity materials. Using temperatures from many locations of the test material’s surface increased resilience to noise, reducing the distribution of thermal diffusivity measurements by more than an order of magnitude. The models developed in this study could enable a more relaxed Flash Method experimental setup that maintains thermal diffusivity accuracy and extend the utility of the Flash Method to semitransparent materials.

Analysis Of Dynamic Difficulty Scaling Ai In Video Games, Tyrese W. Walker

Honors Program: Senior Projects (Public)

Video games are a popular form of interactive media and, since their inception, have become one of the largest forms of media consumed. As such, they have evolved greatly from their humble beginnings into much more complex experiences, and adjusting the difficulty level to suit the needs of the player has become common practice. While there are simple ways to do so, the best games often feature a dynamic difficulty-scaling system that adapts to the player. Classics like Resident Evil and Left 4 Dead are excellent examples of innovative dynamic scaling design. By analyzing the strongest elements of these works, …