Digital Commons Network^™

Critical Parameters Controlling Oxide Scale Formation And Hydro-Descaling Efficiency During Steelmaking, Tochukwu Princewill Ojiako

Doctoral Dissertations

In modern steelmaking, cast slabs are exposed to high-temperature oxidizing environments during secondary cooling, reheating, and hot rolling, resulting in the formation of multilayer oxide scales on the steel surface. These scales interact with mold-flux residues originating from the casting process (CC). The morphology, chemistry, and adhesion of oxide scale strongly influence its removability during high-pressure hydraulic descaling and ultimately determine the surface quality of hot-rolled products. However, the mechanistic relationship between oxide scale evolution, scale-steel interfacial structure, and hydraulic descaling performance remains poorly understood.

This dissertation investigates oxide scale formation, modification, and removal in low-carbon thin-slab steels produced by …

Incremental Cluster Validity Indices And Their Role In Interpreting Lifelong Learning Systems, Niklas Max Melton

Doctoral Dissertations

Clustering and supervised learning are often treated as distinct paradigms, yet both rely on structure in feature space. This dissertation investigates the relationship between cluster validity indices (CVIs) and supervised learning in real-time and lifelong learning settings where data arrive incrementally and cannot be revisited. Across four studies, it develops methods for online cluster validation, uses supervised learning to improve their interpretability, and applies these ideas to evaluating performance degradation in continual learning.

The first study extends incremental cluster validity indices (iCVIs), enabling widely used validation metrics to operate in streaming environments. Experiments on synthetic and real-world datasets show systematic …

Fully Differential Studies On Dissociative Capture In P + D2 Collisions And On Ionization In P + He Collisions, Shruti Majumdar

Doctoral Dissertations

Advancing our understanding of few-body dynamics in simple atomic systems is a fundamental objective in atomic scattering research. The underlying problem is that the Schrödinger equation is not analytically solvable for more than two mutually interacting particles. This involves a comprehensive exploration of various channels, such as ionization, capture, and excitation. A common theoretical approach to describe ion-atom collisions is based on perturbation theory, where the scattering amplitude is expanded in powers of the interaction potential. Here, understanding the few-body problem means accurately describing the relative importance of the higher- vs the first order terms.

In the case of ionization, …

Milankovitch Paleoclimatic Signals In Upper Permian–Lower Triassic Fluvial-Lacustrine Records, Bogda Mountains, Greater Turpan-Junggar Intracontinental Rift Basin, Nw China, Wentao Zhang

Doctoral Dissertations

"The objective of this study is to understand whether Milankovitch climatic and/or tectonic processes influenced the sedimentation of the upper Permian–Lower Triassic fluvial-lacustrine cyclic deposits in Bogda Mountains, greater Turpan-Junggar intracontinental rift basin, Xinjiang Uygur Autonomous Region, NW China. This study carried out gamma analysis, gamma and astronomical tuning, and spectral analysis on the Wutonggou, Jiucaiyuan, and Shaofanggou low-order cycles of the South and Central Taodonggou, South and North Tarlong, Dalongkou, and Zhaobishan sections. Stable and positive gamma values support the assumption of facies-dependent sedimentation rates for non-marine facies. The sedimentation rates range from 0.04 to 2.43 m/kyr, and 0.21 …

Accelerating Circular Economy Transition For A Sustainable Built Environment: A Systems-Based Framework, Radwa Walid Yassin Eissa

Doctoral Dissertations

"The Circular Economy (CE) has gained momentum as a transformative framework for steering the construction value chain towards greater sustainability. However, this transition requires shifts in production and consumption patterns, adoption of circular business models, and the replacement of linear practices. Despite growing interest, CE adoption in construction faces persistent challenges, including sectoral fragmentation, lack of integrated governance frameworks, and limited coordination among stakeholders. This dissertation aims to accelerate the CE transition in the built environment through a multi-scale, interdisciplinary approach spanning five modules: (1) Module 1 develops a construction value chain-structured portfolio of CE strategies and assesses their implementation; …

Bond Graph And Extended Generalized Average Method With Applications In Cyber-Physical Systems And Power Electronics, Arnold Anthony Fernandes

Doctoral Dissertations

"This research examines two applications of control theory. The first application considers the bond graph (BG) modeling technique, which is used to develop the MATLAB structural analysis toolbox (MATSAT), an open-source toolbox for sensor placement and qualitative system analysis that considers the observability and fault-detection capabilities of multi-domain cyberphysical systems. The toolbox provides information on redundant sensors, guiding the system designer in cost and security trade-offs. The toolbox uses traditional BG causality assignment procedures. Additionally, MATSAT provides optimal causality assignment methods that perform significantly better at assigning causality to BGs with increased junctions, sources, and simple meshes, without encountering causality …

Integrating Stakeholder Priorities Into Resilience Planning And Investment Decision-Making, Victoria Jeaneen Kraemer

Doctoral Dissertations

"Resilience is a system’s ability to bounce back from a disruption. However, resilience needs may vary across different stakeholders. To better integrate stakeholder input into resilience planning and investment decision-making, existing frameworks were combined to develop the Integrated Stakeholder-Centered Resilience Framework. This broad framework is tailorable across contexts and stakeholder types. Research results demonstrate the use of this framework to evaluate the effects of disruptions and represent stakeholder preferences for investments. In the first study, participants were randomly assigned to power outage scenarios, which did not affect their criteria priorities. An exploratory factor analysis revealed two main priorities, (1) Absorption …

An Energy-Stable Mixed Cg-Dg Scheme For A Full Shliomis Phase Field Model Of Two-Phase Ferrofluid Flows, Mahdi Gharehbaygloo

Doctoral Dissertations

"Ferrofluids are magnetic nanoparticle suspensions whose motion couples surface tension, flow field, magnetostatics, and magnetization dynamics. This dissertation develops, analyzes, and validates an energy-stable finite element method for a two-phase ferrofluid model that couples the Cahn-Hilliard equations with the full Shliomis model of single-phase ferrofluids, retaining its damping torque term, magnetic torque term, and magnetic stress term.

The spatial discretization is a mixed continuous Galerkin (CG) and discontinuous Galerkin (DG) formulation. It uses continuous ��2 elements for the phase field, chemical potential, velocity, and magnetostatic potential, discontinuous ��2 elements for the magnetization, and discontinuous ��1 elements for the pressure. The …

From Perspectival Myopia To Professional Transformation: An Autoethnographic Retrospection Of A High School Principal From Nepal, Shankar Dhakal, Geoffrey W. Lummis, Andrew Jones

Research outputs 2022 to 2026

This paper presents a re-storied account of my (lead author) decade-long (2007–2017) professional journey as a high school principal in diverse educational settings in Nepal. Using an autoethnographic approach, I have theorized my leadership transformation approaches through professional storytelling, employing critical reflexivity to trace intimate leadership experiences where authoritarian approaches to leadership, disparities, and inequalities in schools run rampant. My perspectival myopia, professional vulnerabilities, and the discrepancies between my leadership ideals and behaviors resulted in issues such as perceptions of disengagement, underperformance, and dissatisfaction on the receiving end, prompting me to contemplate professional transformation. While outlining several significant steps and …

Laws Of Mechanics And Stationary Black Holes, Asma Iqbal

Master of Science in Mathematics

The aim of this thesis is to study laws of mechanics of Black Holes in the context of General Relativity. Important tools of General Relativity have been covered including concept of curvature and causal structure of spacetime. It then explore some characteristics of Schwarzschild and Kerr Black Holes and derived global quantities of them. These global quantities which are defined on Event Horizon of Black Hole makes analogy with the thermodynamics of physics. It then presents the Black Hole analogue of the zeroth, first, second and third laws of classical mecanics in General Relativity.

Approximation Of Solution Of Certain Nonlinear Problems With Applications, Faisal Aijaz

Master of Science in Mathematics

In the thesis, we established the strong convergence of inertial iterative scheme designed to approximate the common solutions of the equilibrium and the fixed-point problem for non-expansive mappings in Hilbert spaces. Through extensive numerical analysis, we analyze the efficiency of the algorithm and demonstrate that the incorporation of the inertial technique yields a significantly faster convergence rate than existing comparable schemes. Furthermore, we examine the effect of initial value on the convergence dynamics, offering visual and comparative assessments against classical methods. To highlight the practical utility and versatility of our framework, we apply the algorithm to signal restoration problems, and …

Metric And Dominant Metric Dimension Of Weakly Zero-Divisor Graphs, Adnan Hussain

Master of Science in Mathematics

This thesis investigates the metric dimension and dominant metric dimension of weakly zero-divisor graphs associated with commutative rings. The study focuses on determining resolving sets and dominating resolving sets for several classes of Γ(Z𝑛) graphs. These results establish connections between algebraic properties of rings and combinatorial characteristics of their associated graphs.

Deep Learning And Computer Vision-Based Modeling For A Real-Time Traffic Congestion Monitoring Framework, Neil Dustin Benedict A. Agner, Angelo B. Dela Cruz, Aster Benedict A. Mangabat, Raphael B. Alampay, Patricia Angela R. Abu

Ateneo Laboratory for Intelligent Visual Environments

As intelligent traffic systems evolve to manage complex urban mobility, conventional congestion estimation techniques, such as the time-windowed Volume-to-Capacity (V/C) ratio, fail to capture capture the real-time traffic situation. Because these methods rely on vehicles crossing a specific point, they often fail to register stopped cars, creating a ‘zero flow’ paradox where complete gridlock is incorrectly categorized as an empty, free-flowing road. To address these limitations, this study proposes an end-to-end computer vision framework utilizing the Real-Time DEtection TRansformer (RT-DETR) model to quantify vehicle volume and immediately classify a roadway’s Level of Service (LOS) through spatial density. In processing video …

Modulation Of Ccr2/Ccl2 Molecular Axis In The Expansion And Rupture Of Abdominal Aortic Aneurysms, Ryan Wahidi, Santiago Elizondo-Benedetto, Ryan Catlett, Bera Koklu, Mohamed A Zayed

2020-Current year OA Pubs

The CCR2/CCL2 molecular axis is a critical mediator of abdominal aortic aneurysm (AAA) pathogenesis. It has been demonstrated to drive chronic inflammation, extracellular matrix degradation, and vascular remodeling through the recruitment and activation of monocytes/macrophages and other immune cell types. Pre-clinical studies demonstrate that CCR2 inhibition reduces AAA formation, expansion, and progression in animal models. Emerging imaging techniques have validated CCR2 as a biomarker for AAA instability in humans. Although clinical trials targeting CCR2 are currently limited in number, ongoing translational studies highlight that CCR2 blockade is a promising therapeutic strategy to mitigate AAA expansion and the risk of rupture. …

Developmental Themes Associated With Religious Activity After Early Return From A Latter-Day Saint Mission, Samuel E. Hancock, Sam A. Hardy, Michael Goodman, Camron Angell, Jenae M. Nelson

Faculty Publications

In the Church of Jesus Christ of Latter-day Saints, qualified young men are expected (and young women are given the option) to complete extended missionary service during the transition to adulthood. Some youth end their missionary service short of the anticipated duration, which is associated with markedly lower rates of religious activity post-return. This study is a qualitative inquiry into the developmental themes associated with early returned missionaries from the Church of Jesus Christ of Latter-day Saints who chose to remain active (be consistently involved with the church), sampling from areas with high rates of Latter-day Saint activity, where stigmatization …

Eligibility For Anti-Amyloid Treatment In A Multiethnic Community-Based Study, Lydia Trudel, Joseph Therriault, Arthur C Macedo, Karin L Meeker, Meredith N Braskie, Arthur W Toga, Serge Gauthier, Paolo Vitali, Suzanne E Schindler, Sid E O'Bryant, Pedro Rosa-Neto

2020-Current year OA Pubs

INTRODUCTION: The approval of anti-amyloid monoclonal antibodies (mAbs), including lecanemab and donanemab, represents a significant advance in disease-modifying therapies (DMTs) for early Alzheimer's disease (AD). While appropriate use recommendations (AURs) have been established to guide clinical decision-making, the proportion of individuals with cognitive impairment in real-world, multiethnic populations meeting eligibility criteria remains unknown, as do potential differences in treatment-related risks across ethnic groups.

METHODS: We included 513 cognitively impaired individuals from the Health and Aging Brain Study-Health Disparities study, a multiethnic community-based cohort. Eligibility for lecanemab and donanemab was determined using published AUR criteria. Counts of amyloid-related imaging abnormalities were …

Ex Vivo Assessment Of Keratinocytic Carcinomas Using A Fast Mid-Infrared Probe., Maria G Vazquez De Vasquez, Rebecca C Bradley, Charles L Hitchcock, Angela S Casey, Austin Cusick, James V Coe, Ronald Siegle

Ambulatory and Primary Care Articles

A fast mid-infrared spectral probe was used to record infrared (IR) spectra of fresh skin tissue removed from patients with biopsy-proven keratinocytic cancer (KC) during Mohs surgery. A 150-patient library of IR spectral data was obtained to see if KC on the epidermal side (outside) of tissue samples can be differentiated from adjacent nonmalignant tissue and normal skin. A linear support vector machine model minimized overtraining predicting the contributions to decisions at each step in the spectrum. Training with an equal cost for KC and nontumor cases samples demonstrated a KC sensitivity of 93% ± 5% and specificity 82% ± …

Hey, Siri: How Companionate Ai Usage Affects Social Satisfaction And Personal Intelligence, Ryan E. Moran, Marley Ireland

Honors Theses and Capstones

Artificial intelligence is a field that is growing and changing faster than humanity can keep up. While part of the population is benefiting from its unmatched diagnostic power, increased productivity in school and in work, and even its surgical and therapeutic contributions, others are filing lawsuits based on claims that an AI chatbot was a key factor in the mental health crisis of someone they loved. Research has found that reliance on these AI-generated conversational agents can lead to social withdrawal, unrealistic relationship expectations, addictive tendencies, and, in the worst cases, increased or encouraged suicidal ideations, especially in vulnerable populations. …

The Paradox Of Matriliny: Cultural Authority And The Political Marginalization Of Women In Meghalaya, Kasturi Bharadwaj

Journal of International Women's Studies

The global discourse on gender equality gained momentum after the 1975 United Nations World Conference on Women. It continued through a series of international initiatives and culminated in the Beijing Declaration and Platform for Action, which emphasized women’s rights and their participation in political, social, and economic life. Despite these normative commitments at the international level, women’s political participation and representation within administrative and decision-making structures continue to be uneven, limited, and structurally constrained across many societies. In this context, the study investigates the political participation and representation of women in Meghalaya, a tribal state in Northeast India characterized by …

Submicron Diamond-Assisted Irrigation Enhances Apical Biofilm Removal Under Sonic And Ultrasonic Activation: An Ex Vivo Study, Yung-Szu Hsu, Nai-Chia Teng, Sin-Yu Chen, Huan-Cheng Chang, Haw-Ming Huang, Sung-Chih Hsieh

Journal of Dental Sciences

Background/purpose:

Residual apical biofilm often persists despite sodium hypochlorite (NaOCl) irrigation with sonic or ultrasonic activation. Submicron diamond particles (SMD) have shown promise as a particle-assisted adjunct for root canal cleaning, but their effects on mature intracanal biofilm remain unclear. This study evaluated whether 500-nm SMD particles (10 mg/mL) improve the antibacterial and antibiofilm efficacy of saline or NaOCl irrigation against mature Enterococcus faecalis (E. faecalis) biofilms.

Materials and methods:

One hundred single-rooted human premolars infected with E. faecalis for 21 days were randomly allocated to ten irrigation protocols (n = 10). Antibacterial efficacy was assessed by …

Exosomes Derived From Bone Substitute-Induced Gingival Mesenchymal Stem Cells Promote Angiogenesis, Chongyu Shen, Zheng Guan, Rui Chu, Zhengyin Li, Jiangting Lu, Liangkun Xie

Journal of Dental Sciences

Background/purpose: In certain clinical bone grafting scenarios, bone substitutes frequently interface with the adjacent soft tissues. This study aimed to investigate whether deproteinized bovine bone mineral (DBBM) and coralline hydroxyapatite (CHA) induce paracrine responses in human gingival mesenchymal stem cells (GMSCs), thereby altering the pro-angiogenic capacity of their derived exosomes, and to profile specific cargo alterations.

Materials and methods: Exosomes were isolated from GMSCs co-cultured with DBBM (DBBM-G-EXO) or CHA (CHA-G-EXO), while native GMSCs-derived exosomes (G-EXO) were collected as controls. The angiogenic effects of these exosomes on human umbilical vein endothelial cells (HUVEC) were evaluated via cell proliferation, scratch wound …

Oral Health Knowledge Across Cultural Boundaries: A Physiology And Hygiene Textbook From The Tamsui Middle School During The Japanese Colonial Period, Hung-Lun Pan, Feng-Chou Cheng, Chun-Pin Chiang

Journal of Dental Sciences

No abstract provided.

A Scientometric Study On Research Trends And Characteristics Of Lymph Node Metastasis In Oral Cancer, Linjian Huang, Xiaocui Tong, Wei Liu, Xinyu Zhang

Journal of Dental Sciences

Background/purpose: Cervical lymph node metastasis (LNM) is the most critical prognostic factor in oral cancer (OC) patients. The purpose of this study was to analyze the scientometric characteristics and research trends of LNM in OC.

Materials and methods: All the papers on LNM in OC were comprehensively retrieved from the Scopus database. The years of publication were divided into before 2016 and after 2016 in the analysis of research trends.

Results: There were 946 papers on LNM in OC, with total citations of 21,154 and the h index of 70. The trend of clinical aspect including lymph …

The Evolution Of Artificial Intelligence And Deep Learning In Removable Partial Denture Design, Fu-Chuan Tsai, Hsin-Hua Chou, Takashi Saito, Wei-Chun Lin

Journal of Dental Sciences

No abstract provided.

Virtual Patient Technology Enabled The Reconstruction Of Craniofacial Hard And Soft Tissues Through The Integration And Superimposition Of Multimodal Dental Imaging Datasets, Hsin-Hua Chou, Kuo‑Ning Ho, Takashi Saito, Wei-Chun Lin

Journal of Dental Sciences

No abstract provided.

Roles And Functions Of The Dental Division At The National Taiwan University Cancer Center, Feng-Chou Cheng, Yu-Jie Shen, Shu-Yu Liu, Chun-Pin Chiang

Journal of Dental Sciences

No abstract provided.

Comparative Life Cycle Assessment Of End-Of-Life Crystal Silicon Photovoltaic Panels: Recovery Methods And Extended Life In Agricultural Application, Patima Chaichana, Vacharaporn Soonsin, Nattapong Tuntiwiwattanapun

Applied Environmental Research

The increasing deployment of crystalline silicon (c-Si) photovoltaic (PV) panels has raised concerns about their waste management. This study evaluated management strategies for discarded c-Si PV panels in Thailand, integrating environmental and economic analyses. Life cycle assessment (LCA) and cost-effectiveness analysis (CEA) were applied. The LCA can be divided into 2 parts: (1) secured landfill vs decentralized recycling by existing facilities vs centralized full recovery and (2) reusing PV panels in agricultural applications. The results revealed that secured landfills were the most environmentally burdensome (34.43 Pt), whereas centralized recycling achieved net benefits (-211.93 Pt) through emission reductions and recovery of …

Life Cycle Assessment Of Co2-To-Methanol: Comparative Evaluation Of Direct And Alcohol-Assisted Hydrogenation Routes, Chayet Worathitanon, Naphat Chansonthi, Pawat Pinthong, Kritsana Suwanamad, Viganda Varabuntoonvit

Applied Environmental Research

The increasing severity of global warming, primarily driven by greenhouse gas emissions, underscores the urgent need for CO2 reduction and utilization strategies. Converting CO2 into methanol presents a promising approach, as methanol serves both as a fuel and a feedstock in various industries. This study evaluates the life cycle environmental impacts of three methanol production routes: (1) direct CO2 hydrogenation, (2) ethanol-assisted CO2 hydrogenation, and (3) propanol-assisted CO2 hydrogenation. Two energy scenarios are considered: conventional energy and wind power. Process simulations were performed using Aspen Plus V.14, and inventories were analyzed through Life Cycle Assessment (LCA) using the ReCiPe 2016 …

Unveiling Microplastic Removal And Characteristics In Wastewater From Two Municipal Wastewater Treatment Facilities In Indonesia, Nurul Setiadewi, Prayatni Soewondo, Cynthia Henny

Applied Environmental Research

Wastewater treatment plants (WWTPs) are considered an entrance pathways for microplastic (MP) pollution in aquatic environments. This study reveals the removal and characteristics of MPs in wastewater from two municipal WWTPs in Indonesia. The influent contained 17.1 ± 5.65 particles L-1 (WWTP A) and 15.45 ± 4.31 particles L-1 (WWTP B), whereas the effluent contained 1.41 ± 0.01 and 1.5 ± 0.16 particles L-1. The removal efficiency was 91.75% for WWTP A and 90.32% for WWTP B, with no statistically significant difference (p > 0.05). WWTP A employed advanced treatment units, whereas WWTP B used a conventional pond-based system. MPs were …

Assessment Of The Influence Of Human Activities On The Occurrence Of Forest Fires In Thailand Via Multiple Linear Regression (Mlr), Sittipong Ruktamatakul, Jirarat Insuk, Benjaporn Pinwongpet, Sarisa Ruktametakul, Pornpis Yimprayoon

Applied Environmental Research

Forest fires represent one of the most critical environmental challenges in Thailand, with impacts varying depending on forest type, fuel characteristics, terrain conditions, fire intensity, and the frequency of fire occurrence on the same landscape. While forest fires can contribute to ecosystem degradation, biodiversity loss, and the depletion of natural resources, such effects are not uniformly severe across all forest ecosystems. Understanding the human-induced factors contributing to forest fire occurrence is crucial for developing effective prevention strategies and promoting sustainable forest management. This study aimed to identify the anthropogenic factors influencing forest fire areas in Thailand via multiple linear regression …