Digital Commons Network^™

Development Of Supervised Machine Learning-Based Life-Cycle Cost Estimation And Prediction Models For Comparative Sewer System Rehabilitation Using Open-Cut And Trenchless Cured-In-Place Pipe Methods, Gayatri R. Thakre

Civil Engineering Dissertations - Archive

Aging wastewater infrastructure in the United States demands renewal strategies that balance cost-effectiveness, sustainability, and minimal social disruption. Conventional open-cut pipeline installation (OCPI) involves extensive excavation and restoration, whereas trenchless alternatives such as Cured-in-Place Pipe (CIPP) Renewal Technology offer reduced surface disturbance and environmental impacts. However, existing studies primarily focus on Construction Costs (CC), neglecting integrated life-cycle evaluations that also account for Environmental Costs (EC) and Social Costs (SC).

The primary objectives of this research are to develop supervised machine-learning (ML) models to estimate and predict CC in 2025 US dollars (USD) per linear foot of OCPI and CIPP Renewal …

Development Of A Drone-Assisted Pavement Management Framework Based On The Pavement Condition Index For University Parking Lots, Omesh Pasuluru

Civil Engineering Theses - Archive

Efficient pavement management is essential for keeping university parking lots in good condition. At the University of Texas at Arlington, parking areas experience heavy use and environmental wear, which can cause damage if not addressed early. Traditional methods for assessing pavement conditions are time-consuming, interrupt daily activities, and are expensive. Hence, there is a need for better solutions. This study introduces a drone-based pavement management approach that uses the Pavement Condition Index (PCI) system. The PCI is a numerical scale from 0 to 100 that rates pavement quality based on surface condition. A high PCI score (85-100) indicates the pavement …

Structural Performance Of High-Rise Rc Buildings With Sfrc Columns And Shear Walls Subjected To Seismic Loading, Ali Azzawi

Civil Engineering Theses - Archive

To investigate the seismic performance of high-rise RC buildings with steel fiber reinforced concrete (SFRC) columns and shear walls, a detailed numerical analysis was established using RISA-3D software on twelve-story RC buildings subjected to earthquakes. The variables included in this research are steel fiber volume fraction (SFVF), number of stories with SFRC columns and shear walls, and concrete strength grade. The mechanical properties of the concrete for each mix are evaluated experimentally. Three types of concrete mix designs were performed in the Civil Engineering Laboratory Building (CELB) using different dosages of steel fibers (0, 25lb/cy, and 70lb/cy). The properties of …

Chromatin Architecture And Dynamics In Native Folding States, Tianyu Yuan

Yale Graduate School of Arts and Sciences Dissertations

The central question in chromatin architecture and dynamics is how meter-long DNA strands are organized within a micrometer-sized nucleus while maintaining regulation of all genomic activities. While some organizational principles have been identified and validated through both theoretical models and experiments, controversies between alternative mechanisms persist,continually refining and enriching our understanding of chromatin architecture and dynamics. At the intermediate length scale, chromatin architecture is characterized by topologically associating domains (TADs), revealed through experimental Hi-C contact maps. This organization can be explained and modeled using loop extrusion factor (LEF) models, which rely on the correlation between TAD boundaries and the genomic …

Resource-Aware Distributed Machine Learning: Unified Approaches For Private And Efficient On-Device Intelligence, Yeshwanth Venkatesha

Yale Graduate School of Arts and Sciences Dissertations

The widespread integration of Artificial Intelligence (AI) into everyday life is driving a paradigm shift towards deploying machine learning models on a massive, distributed ecosystem of edge devices. While this decentralization offers opportunities for data-driven applications, it introduces a fundamental trilemma: the concurrent pursuit of high performance, operational efficiency, and stringent data privacy. State-of-the-art AI models, particularly Large Language Models (LLMs), demand computational and memory resources that far exceed the capabilities of typical edge devices, creating significant bottlenecks in training and inference. Furthermore, the distributed nature of data gives rise to challenges of statistical heterogeneity and communication overhead, while the …

Regulation Of Pre-Mrna Processing Through Nascent Rna Folding, Leonard Schaerfen

Yale Graduate School of Arts and Sciences Dissertations

RNA sequence determines the formation of intramolecular base pairs. Together with tertiary contacts, base pairs define every RNA's structure, or fold. The catalytic, regulatory, or coding potential of an RNA strongly depends on its folding pattern. Because base pairing occurs much faster than RNA synthesis (transcription) in cells, early structural states can govern RNA processing events and dictate the formation of functional conformations. These co-transcriptional structural states remained largely unknown. To address this gap, I developed CoSTseq, a chemical probing and enrichment method to measure nascent RNA base pairing upon exit from RNA polymerases (Pols) transcriptome-wide in living Saccharomyces cerevisiae …

Characterization Of Municipal Solid Waste Using Machine Learning Based Imaging And Chemical Analysis, Enyonam Ahadzi

Theses and Dissertations--Biosystems and Agricultural Engineering

According to the U.S. Department of Energy’s 2023-billion-ton report, the United States generates nearly 300 million tons of municipal solid waste every year. More than 50% of that waste is underutilized and ends up in landfills. This poses serious public health and environmental risks. But beyond the environmental and health implications, this is also a wasted opportunity. The U.S. Energy Information Administration estimates that, for every 100 lbs of waste we throw away, about 85% can be used as fuel or for electricity generation. However, its complex and heterogeneous nature poses challenges for efficient sorting and valorization in waste to …

Valorizing Municipal Solid Waste For Sustainable Aviation Fuel And Polyhydroxyalkanoate Bioplastics: Pyrolysis And Microbial Pathways, Emon Das

Theses and Dissertations--Biosystems and Agricultural Engineering

The escalating global burden of municipal solid waste (MSW), projected to reach 3.88 billion tons annually by 2050, calls for innovative valorization strategies to mitigate environmental impacts and promote a circular bioeconomy. This thesis investigates the conversion of MSW into two high-value products: sustainable aviation fuel (SAF) and polyhydroxyalkanoate (PHA) bioplastics. Chapter one presents comprehensive physicochemical characterization and pyrolysis-GC/MS analysis of MSW feedstocks. The physicochemical results reveal that densification enhances handling and storage properties, while pyrolysis-GC/MS analysis indicates that plastic-rich MSW streams produce bio-oils with favorable hydrocarbon profiles suitable for SAF production, potentially contributing to decarbonization efforts in the aviation …

A Design And Analysis Of Computer Experiments Approach To Water Distribution Network Seismic Rehabilitation Optimization, Uthman Abiola Kareem

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

Water is an essential part of human life. However, there are critical infrastructures that enable water availability in communities and homes. One of such is a water distribution network. Water distribution network performance depends on its reliability, which could be threatened by external agents like earthquakes. When earthquakes occur, they cause damages on some pipes within the distribution network and this limits performance of water distribution network. While earthquakes cannot be prevented, effective maintenance intervention may reduce the impact of earthquakes on water distribution networks. In order to develop an effective maintenance plan, researchers approach it in different ways. However, …

Analysis Of Crowd Logistics Networks Using Agent-Based Models, Preetam Kulkarni

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

Crowd logistics is a system in which an online platform connects a group of non-professional couriers (crowd/carriers), who use their under-utilized resources to offer delivery service to other individuals or businesses (senders) for a fee. While crowd logistics platforms have the potential to offer more flexible and responsive delivery services for much lower rates than traditional logistics providers, it is difficult for platforms to be successful as it is challenging to meet carriers’ and senders’ expectations. Crowd logistics has been applied in the context of food and grocery delivery, parcel pickup and drop-off services and last-mile delivery, however, it has …

The Impacts Of Land Use And Groundwater Inputs On Stream Health And Habitat Of Jennings Creek, Bowling Green, Kentucky, Allison Francis

Mahurin Honors College Capstone Experience/Thesis Projects

In Bowling Green, Kentucky, the Jennings Creek watershed encompasses the entire city and surrounding area; however, little work has been completed focused on assessing the Creek’s water quality, habitat, and biological indicators. Jennings Creek is fed by several karst groundwater springs, making it highly vulnerable to contamination due to the rapid connection between the surface and subsurface via sinkholes and underground rivers. An examination of Jennings Creek’s water quality, habitat, and biological indicators provides an assessment of the watershed’s health.

The methodology closely followed the methods for assessing habitat by Kentucky’s Energy and Environment Cabinet and was approved for the …

Updating Rainfall Zones And Intensities In Nebraska For Improved Design Of Non-Bridge-Sized Drainage Structures, Rezaul Mahmood, Tirthankar Roy, Chanchal Gupta, Kanak Kanti Kar, William Sorenson

Nebraska Department of Transportation: Research Reports

This study assesses the effectiveness of precipitation zones and Intensity-Duration-Frequency (IDF) curves used by the Nebraska Department of Transportation (NDOT) for designing drainage structures. Twenty stations were selected for the analysis of revised IDF curves out of forty-two stations. Datasets have been considered from the National Center for Environmental Information (NCEI). By Comparing the new curves with existing ones, the study efforts examine the frequency, duration and severe rainfall. The results show that the IDF curves for various zones and stations varied noticeably from one another. Also, noticed that Zone A and B shows lower rainfall intensities in short to …

Empowering Future Educators: Exploring Preservice Elementary Teachers’ Self-Efficacy Within Integrated Stem Experiences In A Science Methods Course, Shane C. Campbell

Theses and Dissertations--Education Sciences

There is an ongoing need for preparing high-quality preservice elementary teachers who are confident and capable in the design and delivery of integrated STEM instruction. This qualitative study examines the experiences of a small cohort of preservice elementary teachers enrolled in a science teaching methods course and further examines how preservice teachers' perceptions of self-efficacy change as a result of their participation in integrated STEM experiences in science methods coursework. Data were collected using pre and post surveys to capture self-reported efficacy levels related to STEM teaching, along with semi-structured interviews conducted before and after the course to further contextualize …

Milk Tooth, 2025, Eddie Anderson, Sadie House, Jay Clark, Ravyn Oliver, Edwin Mayo, Joseph Kettelhodt, Kaitlyn Seibel, Daniel Mcnellis, Elise Fladeboe, Ivy Matejcek, Trinity Johnson, Eve Gwendolyn Hansen, Liz Fisher, Emma Niessink, Hannah Lewis

Milk Tooth

"Writings by Bemidji State University Students". Sponsored by the Bemidji State University English Department.

Educational Experiences Of Latinas In Space Exploration: Achievement Motivation And Science Identity Development, Roslyn Soto Sanchez

CGU Theses & Dissertations

For the U.S. to retain a leading role in understanding the solar system and the universe, a diverse and highly skilled STEM workforce is required. This qualitative study of the K-12 and higher education lived experiences of 30 Latinas who have earned STEM degrees and work in space exploration contributes to existing research by (a) offering insight on the types of achievement motivation that drives them to succeed along these challenging academic pathways; (b) providing an understanding of how Latinas in space exploration developed their science identities, and at what point they felt like they belonged as “real” scientists, engineers …

Enhancement Of Mechanical, Structural, And Electrical Properties In Advanced Composites And Vat Photopolymerized 3d Printing Nanocomposites, Poom Narongdej

CGU Theses & Dissertations

Advanced composites have gained significant attention across various industries, including aerospace, automotive, clean energy, and healthcare, owing to their exceptional mechanical properties and versatility. Fiber-reinforced polymer (FRP) composites, particularly those reinforced with carbon fibers, are extensively used as structural materials in spacecraft, aircraft, high-performance vehicles, and wind turbines due to their high strength-to-weight ratios, stiffness, durability, and tailorable mechanical characteristics. In healthcare, the advent of additive manufacturing (3D printing) has expanded the utility of advanced composites, enabling precise customization of components to meet patient-specific needs while offering design flexibility and ease of fabrication. Despite these advantages, several challenges hinder the …

Adhd As A Lived Experience Amongst Bipoc College Students, Nikash Kale

Honors Theses

This thesis focuses on the perspectives of Black Indigenous and Persons of Color (BIPOC) college students on Attention-deficit/hyperactivity Disorder (ADHD). The study analyzes scoping strategies, perceived symptomatological differences, and the effects of racial, ethnic, and cultural backgrounds among BIPOC college students. Drawing on semi-structured interviews with 14 participants, I examine the full permeation of ADHD among BIPOC college students, its evolution from pre-diagnosis to the present, and how they navigate the disorder and its treatment. A qualitative analysis of ADHD among minorities in college will not only allow clinicians to understand the distinct struggles of BIPOC with ADHD, but it …

Investigation Of Aluminum Hollow Shapes Subject To Torsion, Nora Frederick

Honors Theses

This research investigates the torsional strength of hollow aluminum shapes, specifically fairly stocky square and circular cross-sections made from 6061-T6 alloy. A total of six cross-sections were tested, with six specimens for each cross-section, resulting in 36 tests. Torque and angular deformation data were recorded for each specimen to determine the torque corresponding to full- yield of the cross-section. Additionally, Strand7 finite element models were created to simulate the experimental results and assess whether the torsional behavior could be accurately replicated through numerical analysis. This allows for future research to be conducted using Strand7 or similar finite element software.

The …

How Many Passes Does It Take? An Investigation To Determine The Optimal Number Of Liposome Extrusion Cycles, Kasey Piper

Honors Theses

Liposomes are lipid-based nanoparticles with significant applications in drug delivery and membrane research. One of the most common methods for fabricating liposomes of specific sizes is membrane extrusion, where liposomes are passed through porous membranes to reduce their size. The precise number of passes needed and the factors influencing this process remain unclear. This thesis investigates the relationship between the number of passes through a track-etched polycarbonate membrane and size and lamellarity of extruded liposomes with a focus on lipid type (DOPC, DMPC, Soy PC), membrane pore size (50, 100, 200, 400 nm), and the effect of freeze-thaw cycling. To …

How Does The Bangkok Post Transform Press Into News Stories?, Jenjira Jitpaiboon, Jonathan Newton, Passapong Sriprachan

PASAA

No abstract provided.

Qualitative Interview Coding, Caroline M. Moore

ENGS 15.11: Design and Education

This lesson introduces undergraduate students to rigorous thematic analysis as a tool for gaining insights from qualitative interviews. Aimed at students with some familiarity in Design Thinking, it emphasizes the role of interviewing in understanding user experiences and informing human-centered research. This might be the first lesson in a multi-lesson sequence, allowing the next lesson to go deeper into insights of what design researchers gather from their thematic coding. Through a mix of lecture, individual coding, and small-group coding, students learn to distinguish between inductive and deductive coding and apply these methods to sample interviews. The lesson fosters active learning …

Mangroves: A Lesson On Modeling Changing Shorelines, Willa Skye

ENGS 15.11: Design and Education

This lesson is an overview of storm barriers, specifically mangroves and how they maintain shorelines. It is meant to offer a visual experience of coastline protection and provide a background for deeper understanding about intertidal zones and their conservation. Students will spend time creating a solution to a flooding problem by making a mock coast and storm barrier. To wrap-up the lesson, students will pair up, then reflect on their model and then individually write or draw their takeaways.

Using Design Thinking To Upcycle, Lily Chabica

ENGS 15.11: Design and Education

This 60-minute lesson introduces the power of design thinking as a tool for sustainability. Through short discussions, visual examples, and a hands-on “Trash Island” design challenge, students will explore how creativity can transform waste into value. The session combines theory (understanding upcycling vs. recycling) with active practice (building prototypes from found materials). By the end, students will connect environmental responsibility to personal agency. They will realize that design can drive everyday impact.

Confronting Indecision, Lane Allison Murray

ENGS 15.11: Design and Education

This course aims to increase students' understanding of indecision and how to confront it. The class provides insight into how the fear of the unknown holds people back from making decisions and about understanding one's values as a means to combat indecision. Students and teachers alike explore instances of indecision and evaluate their own impulses & thought processes by reflecting on the deeper reasons for their choices. Students will increase their comfort level of asking themselves and their peers questions about the values that guide them and, in doing so, strengthen their relationships with themselves and others.

The Hemi-Hand, Shane Bauer, Supriya Ganti, Madelyn Goebel, Harry Leiter, Danny Will

ENGS 89/90 Reports

Current rehabilitation devices, such as splints and therapeutic gloves, aid spastic hemiparetic patients but are often impractical to don independently due to constant muscle contraction. Therefore, hemiparetic patients need a user-friendly method of extension in their affected hand to improve motor coordination, prevent contracture, and maintain muscle balance. The purpose of the device is to make hand expansion technology available to a wider range of individuals. We achieve this by creating a customizable device which both simplifies the donning process, and effectively expands the customers contracted hand. The device uses a base for stabilization, and a detachable cone. The cone …

Control System Development To Improve Outcomes In Policing Of Gun Crimes, Raylene Guo, Sara Magdalena Gómez, Sean Lee, Hongke Lu, Mihir Singh, Scottie Yang

ENGS 89/90 Reports

Law enforcement officials struggle to identify perpetrators of shootings quickly, reliably, and effectively. Data indicates that certain areas are more prone to shootings. Most shootings occur in dense urban areas that makes it difficult to discern relevant individuals related to a shooting and perpetrators of shootings often flee the scene of the crime. We created a cost effective control system that rapidly and accurately identifies individuals in the area in which a gunshot is fired. In order to accomplish this, we integrate existing acoustic sensor technology with cellular phone identification techniques. The acoustic sensors detect and distinguish gunshots and then …

Stolmate 2.0: Independent Takeoff And Landing Measurements For Private Pilots, Dakota Black, Arun Guruswamy, James Quirk, Sydney Savarese, Veronica Yarovinsky

ENGS 89/90 Reports

Takeoff and landing are the most challenging phases of flight. Short Takeoff and Landing (STOL) performance metrics quantify how efficiently an aircraft minimizes takeoff and landing distance. These measurements ensure safety and have even become the basis of STOLcompetitions, where pilots compete to minimize their takeoff and landing distance. While pilots use mathematical models to predict STOL distances, there are no available means for pilots to measure their true STOL performance instantaneously, affordably, and easily. STOLmate 1.0 laid the foundation for instantaneous, accessible STOL performance reporting; however, the current device requires labor-intensive manufacturing, has reliability issues in certain weather and …

Two-Phase Heat Exchanger Design For A Cryocooler, Matthew Timofeev, Ussaid Mustajab, Omar Sharief, Munachimso Onuoha, Ozgur Tuna Ozturk

ENGS 89/90 Reports

Recuperators are valuable components in refrigeration-cycle devices as they move heat between separate stages within the cycle, lessening the work done by compressors and improving the overall efficiency of the device. For Creare, a Hanover-based engineering firm and our sponsor, a recuperator must be designed to accommodate a mixed-gas flow at cryogenic temperatures. However, upon condensation, mixed-gas becomes a two-phase stream giving rise to heat exchange inefficiencies as the two phases separate and behave thermally distinctly. One way to address this is by incorporating a large surface area porous metal into the recuperator body to remix the two phases into …

Osteophone To Detect Fracture In The Field, Noah Dunleavy, Micah Green, Hannah Chipman, Gabe Landi, Kai Etheridge

ENGS 89/90 Reports

When assessing long bone fractures, X-ray is the state-of-the-art solution. However, its inaccessibility due to cost and distance poses a barrier to nearly half of the global population, and this lack of access inhibits prehospital triage and assessment. Currently, there are no affordable, portable options that can not only rule out— but also detect the presence of— fracture. We are developing a device that implements the principles of sound wave attenuation that underlie other state-of-the-art alternatives to X-ray, such as the clinician administered tuning fork and stethoscope method, but with improved accuracy and objectivity. This approach uses a microcontroller to …

Interventional Radiology Wire Management Device, Daniel Gyaakye Amoateng, Abby Chase, Victoria Cubina-Lopez, Timo Hemphill, Justin Pavan, Kristine Suritis

ENGS 89/90 Reports

Interventional radiologists and other medical professionals perform a variety of procedures that require the use of guidewires and catheters, but unfortunately OR management of these instruments is challenging. Currently, a bowl with internal ridging holds the wires in a heparinized saline bath. This is frustrating and insufficient, as wire identification, separation, and removal is time consuming and difficult. Our device, engineered in collaboration with Dartmouth Health, has addressed these issues by employing a multi-compartment approach to guidewire and catheter storage. Current storage strategies and saline access are still possible, with an open central compartment. Our design also has a compartment …