Digital Commons Network^™

Shaping Egypt’S Transition To Sustainable Electric Transport: Current Policies And Future Directions, Noha A. Ragab

Theses and Dissertations

Egypt has enacted policies to promote the adoption of electric vehicles (EVs) in order to reduce their overall carbon footprint. However, the pace of transition remains limited, so the research aims to answer the following question: “How do current policies shape Egypt’s transition towards sustainable electric transport, and what additional measures can support this transition?" The study employs a qualitative analysis methodology, based on diffusion of innovation theory and conceptual framework, to analyze current policies in Egypt and identify challenges and gaps in their implementation. It also analyzes responses from 23 interviews with experts in the field, manufacturers, dealers, EV …

Beyond Emergency: Charting Pathways To Sustainable Development In Fragile And Conflict-Affected Settings: A Case Study Of Yemen, Sharif Abdurabu Salem Farid Alsahbool

Theses and Dissertations

For nearly a decade, Yemen's eastern governorates of Hadramawt, Shabwah, and Al‑Mahrah have been relatively stable, yet the international aid system has kept delivering short‑term humanitarian relief like food baskets and water trucking instead of shifting to sustainable development that could rebuild people's lives, create jobs, fix infrastructure, and strengthen local government. This thesis investigates why this transition has taken so long. Based on 21 interviews with government officials, international NGO staff, and local NGO managers in these three governorates, the study develops a new way of understanding the problem. It introduces three ideas: the 'emergency mentality', which is a …

Assessing The Relationship Between Subsurface Geology And Surficial Geomorphology: Remotely Predicting Geologic Features And Geohazards Using An Elevation-Trained Machine Learning Algorithm In The Northern Gulf Of Mexico, Allison L. Wing

Theses and Dissertations

This thesis evaluates the capacity to predict subsurface geologic features and submarine landslide susceptibility using surficial geomorphology derived from bathymetric elevation data in the Northern Gulf of Mexico. Quantitative geomorphic variables including slope, curvature, aspect, rugosity, geomorphons, and Bathymetric Position Index were generated from 30-meter digital elevation models and used as explanatory variables in presence-only Maximum Entropy models. Known locations of faults, pockmarks, mud volcanoes, hydrocarbon seeps, and landslides (particularly intact scarps) were used to train and validate predictive models through k-fold cross validation. Model performance was assessed using omission rates and AUC values. Results demonstrate that specific geomorphic signatures, …

The Supply-Side Effects Of Air Pollution On Local Non-Polluting Industries, Erin Hyman

Theses and Dissertations

This paper examines the relationship between PM2.5 and the production of goods and services across industries using a county–industry panel (1999–2013). Fixed effects regressions show higher activity in manufacturing but relative declines in non-polluting sectors, suggesting pollution reflects production intensity and a reallocation toward polluting industries.

Navigating Radical Indeterminacy In The Struggle For A Global Collective Consciousness: The Question Of Eco-Justice And Law Or Universalize The Pluriverse: A Manifesto, More Or Less, Omar Auf

Theses and Dissertations

The processes of interpretation, communication, and re-interpretation leads to the emergence of an approximated collective consciousness, for which it may be struggled and contested by hegemonic. The dominant forces of this contest, capitalism and nationalism, lead to an interdivided world: one that possesses the tools to empathize with each other but is instead leading people to keep their heads down and focus on surviving their own contexts, perceived as existing within different historical times on the same timeline. This leads to legal and justice systems that fail their claim to universality and/or impartiality. Incorporating an ecological lens to justice within …

In Her Words: The Silent Battles Of Egyptian Women With Breast Cancer, Nada Mohamed Ahmed Hassan Nh

Theses and Dissertations

This study investigates the emotional, social, and economic difficulties encountered by Egyptian women from middle- to working-class origins after a breast cancer diagnosis. Despite being a worldwide health concern, local cultural, institutional, and economic circumstances have a significant impact on the lived consequences of breast cancer. Women's post-diagnosis experiences in Egypt are greatly exacerbated by deeply ingrained gender stereotypes, stigma associated with cancer, and systemic injustices in the healthcare system. This research emphasizes women's situated knowledge and views their bodily experiences as crucial sources of insight into larger societal power relations. It is based on feminist perspective theory, especially the …

Advancing Climate Transition Through Fiscal Tools: The Role Of Carbon Taxation And Fuel Subsidy Reform, Farah Amgad Zayed

Theses and Dissertations

This study highlights how fiscal policy tools can accelerate Egypt's climate transition, with emphasis on carbon taxes and fossil fuel subsidies reforms. It investigates how fiscal tools can reduce carbon emissions and promote economic development by primarily relying on qualitative interviews with policymakers, consultants, representatives of the private sector, and civil society actors, paralleled with some descriptive and comparative analysis. The results show that even though Egypt has made significant strides in advancing green transition, including updating the Nationally Determined Contributions (NDC), introducing the first African Voluntary Carbon Market (VCM), as well as phasing out fossil fuel subsidies gradually, institutional …

Spatiotemporal Ecology Of Mycobacterium Ulcerans And Mycolactone Functions In French Guiana And Southeastern United States Aquatic Environments, Magdalene Dogbe

Theses and Dissertations

Mycobacterium ulcerans, the causative agent of Buruli ulcer, produces mycolactone, a polyketide toxin traditionally studied for its role in human pathogenesis. This dissertation presents a comprehensive spatiotemporal analysis of M. ulcerans and mycolactone producing mycobacteria (MPM) ecology in the Americas and also reveals mycolactone's role in the environment as a microbial community regulator. Through comparative studies in French Guiana (endemic) and the southeastern United States (non-endemic), combined with experimental microcosm investigations, this research contributes to environmental pathogen ecology understanding. Environmental surveillance across 2,226 samples from French Guiana revealed complete MPM restriction to freshwater environments, with zero detections from 1,226 coastal …

Toward An Anthropological Ecocriticism, Grant Mcmillan

Theses and Dissertations

Environmental storytelling has increasingly reckoned with concepts and assumptions about (N/a)ture inherited from the Western intellectual tradition. The late 2010s and early 2020s in particular have seen an explosion of fiction that interrogates the limits of these past ideas. Relatedly, ecocriticism of this period has entered a self-reflexive mode that has sought to deal with its own limitations while offering insights that may prove generative for a more general audience of environmentally minded readers. This project adds to ongoing ecocritical discourse by tracing a series of implicit affinities between the broad traditions of anthropology and environmental fiction through their shared …

Fungal Resistance Of Citric Acid Crosslinked Chitosan Treated Wood, Samuel Jacob Barton

Theses and Dissertations

Chitosan (CH), a linear polysaccharide biopolymer derived from chitin, is known for its antimicrobial and antifungal properties. However, its natural hydrophilicity limits its application as a wood preservative. This study explores the crosslinking of chitosan with citric acid (CA) to improve its stability and hydrophobicity, aiming to enhance its efficacy as a wood preservative. The study investigates fungal resistance against Gloeophyllum trabeum (brown-rot) and Trametes versicolor (white-rot) fungi using the AWPA E-10 soil block test for pine and gum samples vacuum-treated and dip-treated with CH-CA concentrations (CH 6%/CA 3%, CH 4%/CA 3%, CH 2%/CA 3%, and CH 1.5%/CA 3%). The …

Acute Exposure Of American Oyster (Crassostrea Virginica) To Selected Antidepressant Drug: Histological, Biochemical, And Immunohistochemical Assessments, Md. Faisal Amin

Theses and Dissertations

The rapid increase in pharmaceutical use has brought significant health benefits to humans. Studies have shown that many pharmaceuticals, such as antidepressants, are often detected in surface waters, groundwater, and even drinking water. These pharmaceuticals in aquatic environments threaten marine life seriously. Marine bivalves are vital source of seafood for people worldwide. In this study, we examined the effects of short-term exposure to fluoxetine, an antidepressant used to treat depression, at low (0.5 μg/L) and high (5 μg/L) doses over a one-week period on American oysters (Crassostrea virginica) under controlled laboratory conditions. Histological analysis revealed atrophy in the gills and …

Cultivating Smiles On The Frontier: The Making Of Brazil’S Soybean Capital And Community Building In Sorriso, 1980-2020, Nathalia Francio Cocenza

Theses and Dissertations

This dissertation explores the transformation of Sorriso, a small municipality in Mato Grosso, Brazil, into one of the world's leading soybean producers, placing its local history within the broader context of global agricultural and economic shifts from 1980 to 2020. Sorriso represents the unique convergence of local, regional, and international forces that reshaped Brazil's agricultural landscape. This study critically examines the political, environmental, and social dynamics that positioned Sorriso at the forefront of soybean production, illuminating the town's transition from a remote frontier settlement to a global agribusiness hub.

Through a detailed analysis of previously unstudied archival sources, interviews with …

Integration Of Mechanism-Driven Computational Modeling And Public Data Resources For Chemical Toxicity Assessment, Elena Chung

Theses and Dissertations

Regulatory toxicology depends primarily on animal testing, which limits throughput, mechanistic interpretability, and applicability to human-relevant endpoints. This dissertation presents computational approaches that integrate publicly available bioactivity data with machine learning to support chemical safety evaluation. Oral carcinogenicity was modeled using curated chemicals from the US Environmental Protection Agency’s Integrated Risk Information System (IRIS) and activity data from over 1,900 PubChem assays. Quantitative structure-activity relationship (QSAR) models trained on statistically prioritized assays demonstrated strong predictive performance and were applied to rank the carcinogenic potential of more than 16,000 compounds. Hepatotoxicity was evaluated using a hybrid modeling approach that combined structural …

Future Of Work: Implication Of Green Economy On Employment Dynamics In Egypt, Sarah Adel Elgohary

Theses and Dissertations

Is Egypt's green economy a reality or just a policy-level aspiration? This thesis explores the tangible impact of the green economy on Egypt's labor market by examining key sectors—automotive, agriculture, and renewable energy. Through qualitative interviews and focus group discussions with private sector representatives, the study assesses the true implications of the green transition from a business-level perspective, beyond the propaganda and hype surrounding climate policies. What is the current scale of the green economy in Egypt's labor market? What existing policies and regulatory frameworks are in place to support the green economy transition? how urgent is the transition to …

Estimation Of Soybean Root Traits Using Computer Vision And Deep Learning, Muhammad Usman

Theses and Dissertations

Root phenotyping provides insights into root structure, function, and response to environmental stimuli, aiding researchers in improving crop yields, developing new plant varieties, and enhancing plant health. Traditionally, measuring root traits, such as length and area, is manual, time-consuming, and resource intensive. This study introduces a deep learning-based computer vision method for soybean root segmentation and traits estimation using RGB (red, green, blue) images captured under controlled illumination. A separate web-based application was also developed that can extract the root length and area using RGB images. A diverse set of 3,363 soybean root images was collected using an in-house root …

The Relationship Between Weather Variablity And Agricultural Land Cover Change In North Dakota (1997-2023) And Its Implication For Future Change, Sabrina Karim

Theses and Dissertations

Climate variability and weather patterns play a critical role in shaping agricultural land use and land cover (LULC), particularly in states like North Dakota, where agriculture dominates the landscape. This study explores the impacts of climatic factors—specifically rainfall, temperature, and Growing Degree Days (GDD)—on agricultural land cover (ALC) changes in North Dakota from 1997 to 2023, with projections for 2033. By combining historical analysis and predictive modeling, the research examines how climate variability has influenced crop dynamics and provides insights into future scenarios. The research uses advanced geospatial tools, including Google Earth Engine, and machine learning techniques such as Random …

Proof Of Concept: Using Uas Technology To Accomplish Aerial Roof Inspections, Madison R. Fanning

Theses and Dissertations

With the growing use of simulation across industries, the digital twin remains an underexplored research area, particularly in emergency management and response. Its real-time updating capability is often overlooked due to the misconception that "digital twin" is merely a complex term for simulation. This paper highlights its distinctiveness through an evasion exercise involving two independent entities in a collocated environment. Using a highly integrated virtual environment (HIVE) and internet of things (IoT) devices, we link the physical system with an analytical simulation, demonstrating the impact of lag times in high-pressure scenarios. The computational model leverages agent-based modeling (ABM) and discrete-event …

A Geomatic Appraisal On Restoration Of Tank Cascade Systems In Ambuliyar Watershed, Tamilnadu, Nasir N

Theses and Dissertations

Tanks and earthen embankments used for water harvesting and storage have been a significant part of India's irrigation system since the 2nd and 3rd centuries. In Tamil Nadu, around 39,202 tanks have storage capacities of around 178.94 million cubic feet. However, they have been impacted by natural and anthropogenic threats such as soil erosion, siltation, inadequate rainfall, and drought. This study aims to determine the current storage capacity of tanks, estimate the loss in storage capacity/volume of silt, estimate the rate of siltation and life of tanks, identify soil erosion-prone zones, and map deteriorating parameters along supply channels.

The study …

The Influence Of The Un Watercourses Convention On The Development Of A Policy Design In The Nile River Basin, Zienab Ali Abdelhady

Theses and Dissertations

The adoption in 1997 of the United Nations Convention on the Law of the Non-navigational Uses of International Watercourses (UN Watercourses Convention or UNWC) marked a milestone in the codification and progressive development of international water law. Similarly, the signature in 2010 by the majority of the Nile Basin states of the Nile River Basin Cooperative Framework Agreement (CFA) was a major step towards a permanent legal and institutional framework as well as a significant shift from the currently applicable legal regime in the basin. The research concludes that the principles enshrined in the UNWC can assist future regional treaty …

Stability Of Lif Mirror Coatings On Space Telescopes At L2 Orbit, Devin M. Lewis

Theses and Dissertations

A team at Goddard Space Flight center has developed a coating of aluminum mirrors they term XeLiF. This coating has high ultraviolet reflection and improved environmental stability over similar LiF coatings. For these reasons, it is a potential candidate for the future Habitable Worlds Observatory (HWO) flagship space telescope mission. However, the stability of XeLiF at the planned L2 orbit of HWO has not been investigated. This study highlights the potential damage to XeLiF when irradiated by electrons that will be present at L2. This radiation will begin removing LiF after 6 years of exposure as well as start roughening …

Substrate Preference And Foraging Behavior Of Two Declining Warblers In Appalachian Shrublands, Samantha Fishman

Theses and Dissertations

Abstract Shrubland and early successional habitats (ESH) support a diversity of wildlife, including many declining songbirds. However, nonnative shrubs increasingly dominate these habitats, potentially altering habitat quality by influencing prey availability. Habitat quality can be assessed by observing foraging behaviors of songbirds and identifying preferred and avoided substrates as well as testing the predictions of optimal foraging theory; specifically that birds will maximize their energy gain relative to the costs. We examined foraging behaviors of Golden-winged Warblers (Vermivora chrysoptera; GWWA) and Chestnut-sided Warblers (Setophaga pensylvanica; CSWA) in ESH on private lands in Virginia with varying amounts …

Public Perceptions Of Fracking And Anti-Fracking Activism: A Theory Of Planned Behavior Approach And Its Implications For Environmental Policy, Okhumode Hector Yakubu

Theses and Dissertations

Hydraulic fracturing, or fracking, has become one of the most contentious energy technologies of the 21st century, drawing support for its economic and energy security benefits and opposition due to its perceived environmental and health risks. This study applies the Theory of Planned Behavior (TPB) to examine the psychological, social, and informational factors that shape public perceptions of fracking and motivate anti-fracking activism. Using a nationally representative sample of U.S. adults (N = 522), this research investigates how attitudes, subjective norms, perceived behavioral control, and domain-specific knowledge predict support or opposition to fracking, as well as intentions to engage in …

A Qualitative Study Exploring Best Practices And Applications Of Green, Eco, And Environmental Social Work In Canadian Social Work Practice, Ryley Kristanne Kowalski

Theses and Dissertations

Humanity and society are deeply connected to nature and the environment at their core. Through processes of colonization, the Industrial Revolution, urbanization, consumerism, and capitalism, people and societies have become increasingly disconnected from the natural environment. Introduced as a helping profession through the Industrial Revolution, social work began rooted in environment but quickly changed to understand human and societal wellbeing through the narrow scope of the social environment through the person-in-environment approach. Modern day issues of climate change, environmental degradation, environmental racism, and environmental justice movements have necessitated social work’s increased understanding of the natural environment. The purpose of this …

Assessment Of Drivers Of Light Attenuation In Virginia Reservoirs, Jackson Barnett

Theses and Dissertations

Water clarity in aquatic ecosystems is crucial for submerged vegetation and algal dynamics. We investigated the factors influencing light attenuation (kd) by measuring total suspended solids (TSS), chlorophyll-a (CHLa), and chromophoric dissolved organic matter (CDOM) across thirteen stations located in seven reservoirs. Average kd was 1.69 m^-1 (range: 0.37-3.99 m^-1), with photic depths averaging 3.27 m (range: 1.15-12.43 m). TSS was the primary predictor of light attenuation (R² = 0.57, P = 0.003, SE = 0.053). Average TSS values for each site were multiplied by the slope of the kd-TSS relationship to find the proportion of kd …

Linking Disturbance & Macrophyte Colonization–Extinction Dynamics To Invasion Success & Community Assembly: Integrating Population, Community, & Landscape Perspectives, Joshua T. Armstrong

Theses and Dissertations

Aquatic plants, macrophytes, are foundational components of freshwater ecosystems, influencing abiotic conditions, providing habitat structure, and shaping biodiversity and community assembly processes. Their role is particularly critical in dynamic systems where disturbance regimes and colonization processes interact to shape community patterns and species distributions. Despite their ecological importance, macrophytes remain underrepresented in theoretical and applied studies of metacommunity dynamics and invasion ecology, especially in natural systems experiencing frequent environmental fluctuations. Here we aim to elucidate how macrophytes influence and respond to spatial and temporal variation in aquatic ecosystems, with a particular focus on colonization-extinction dynamics, invasion success, and community assembly. …

Metakaolin-Based Geopolymer Concrete; Synthesis, Development And Characterization, Heba Fouad

Theses and Dissertations

Geopolymers are rendered as an essential sustainable replacement to the widely used Ordinary Portland Cement (OPC) which causes immense carbon dioxide emissions, hence a detrimental impact on society’s health and the environment. Geopolymers are three-dimensional networks of polymerized tetrahedral silicate and aluminate in the form of Q4(4Al), Q4(3Al) and Q4(2Al) which act as the principal binding phase in concrete. Past research has reported the synthesis of geopolymers from different aluminosilicates precursors, their characterization, and their wide range properties. However, previous studies still have not properly investigated effective range of synthesis ratios for a particular source material, optimum curing regimes, short- …

End-To-End Autonomous Quadcopter Using Reinforcement Learning, Mohamed Marwan Chawa

Theses and Dissertations

This thesis investigates the potential of Reinforcement Learning (RL) for achieving robust and adaptable quadcopter control, focusing on trajectory and attitude stabilization. We compare state-of-the-art RL algorithms, specifically Proximal Policy Optimization (PPO), against traditional Proportional-Integral-Derivative (PID) controllers across three tasks: hovering, slow trajectory following, and fast trajectory following. To enhance realism, we employ a modified PyFlyt simulation environment with a high-fidelity Crazyflie 2.x model, accounting for motor dynamics, noise, wind disturbances, and aerodynamic drag.

The challenge of operating a quadcopter can be divided into two distinct parts: planning a flight path and actually following that path. Our focus is on …

Discharge-To-Water Level Conversion Using Monthly Duration Curves (Dwl-Mdc): Enhancing The Utility Of The Geoglows Ecmwf Hydrological Model, Darlly Judith Rojas Lesmes

Theses and Dissertations

Flood early warning systems are crucial for disaster risk reduction strategies, enabling communities to take timely action against threats. However, the effectiveness of these systems depends on accurate and timely hydrological data, particularly river discharge and water level measurements. Unfortunately, many regions, face significant challenges in obtaining hydrological data, especially discharge data due to outdated rating curves, high equipment costs, and logistical constraints. Water level measurements, by contrast, offer reduced uncertainty and are often more accessible, providing an alternative for hydrological modeling in data-scarce regions. To address these limitations, we developed and validated the Discharge-to-Water Level Conversion Using Monthly Duration …

Impact Of Cascading Optical Processes On Spectroscopic Quantification Of Absorption And Scattering Properties Of Samples, Pathum Dilshan De Silva Wathudura

Theses and Dissertations

Light absorption and scattering are fundamental properties of matter, particularly significant in nanoscale materials. This study explores how cascading optical processes affect the experimental measurement of absorption and scattering intensities, along with scattering depolarization, in samples containing absorbers and scatterers. The experimental UV–vis spectrum results from the combination of absorption and scattering extinction spectra. However, the maximum measurable extinction may be limited by forward scattered light. Light absorption decreases the intensity of scattered light and influences scattering depolarization. While scattering can reduce absorption along the optical path to the detector, sufficient absorption of the scattered light may counterbalance this effect, …

Effects Of Metoprolol And Propranolol Beta-Blockers Mixture On Morphological And Physiological Responses In The American Oyster, Andrew Salinas

Theses and Dissertations

Beta-blockers are extensively used to treat human cardiovascular conditions yet pose significant risks to non-target aquatic organisms. This study aimed to investigate the effects of short-term exposure (one week) to a beta-blocker’s mixture (low-dose: 50 ng/L propranolol and 250 ng/L metoprolol, and high-dose: 250 ng/L propranolol and 650 ng/L metoprolol) in the American oysters. Histopathological assessments revealed structural damage to gills, connective tissues, and digestive glands in both low- and high-dose treatment groups. Additionally, glucose concentration and pH of the extrapallial fluid significantly declined in the high-dose treatment group. Hemocyte density within connective tissues increased proportionally with dosage. The beta-blocker …