Digital Commons Network^™

Origin And Maintenance Of The Andean Bird Fauna, Elkin A. Tenorio

Dissertations, Theses, and Capstone Projects

The origin and maintenance of the tropical montane diversity have been evaluated over multiple decades using various techniques and perspectives. Despite major progress in understanding phylogenetic relationships, diversification patterns, distributional data, and general ecology in the Andean biota, large gaps in our understanding remain, particularly in the synthesis across scales. To fill these gaps, I aimed to explore patterns and processes that underlie species diversification in birds of the tropical Andes of South America by combining different approaches using phenotypic, phylogenetic, and genomic data in multiple temporal and spatial scales.

In the first chapter, I examined the macroevolutionary patterns of …

An Interpolating Regime For The Extreme Values Of A Random Zeta Model, Christine K. Chang

Dissertations, Theses, and Capstone Projects

We study the large values of a random model of the Riemann zeta function over short intervals. The extreme value statistics depend on the interval size: the log-correlated regime governs intervals of order one while the i.i.d. regime emerges over longer intervals. The main focus is to describe the transition between these two well-understood regimes as the interval varies in length. This thesis shows that there is an intermediate regime where the behavior of the zeta model’s maxima cannot be entirely captured by either extreme— i.i.d. or fully log-correlated. This suggests that the Riemann zeta function exhibits correlations around its …

The Interaction Of Multilingualism And Depressed Mood On Cognitive Set-Shifting, Annalise Caviasco

Dissertations, Theses, and Capstone Projects

Although findings are mixed, many researchers believe there are cognitive benefits to multilingualism, a phenomenon dubbed the “bilingual advantage”. Of these apparent benefits, cognitive flexibility, or the ability to shift thinking styles based on the context or specific demands of a certain situation, is thought to be highly relevant. Current literature suggests that one aspect of multilingualism, the practice of “code-switching” between languages throughout their daily lives, is related to increased general cognitive flexibility compared to monolinguals. Another branch of research on cognitive flexibility investigating the role of affect in cognition demonstrates that clinical depression as well as transient negative …

Nonlinear Diffusion, Hydrodynamic Cascades And Jamming In Kinetically Constrained Systems: Insights From Lattice Gas Models, Abhishek Raj

Dissertations, Theses, and Capstone Projects

This dissertation investigates non-linear diffusion processes and emergent dynamical phenomena in kinetically constrained lattice gases. Two central models are considered: a one-dimensional lattice gas exhibiting a diffusion cascade triggered by hydrodynamic nonlinearities and a triangular ladder exclusion model that undergoes a jamming transition. The former demonstrates stretched exponential decay consistent with non-perturbative long-time tails, while the latter illustrates how classical-quantum mappings yield insight into glassy dynamics and mobility constraints. Through a combination of numerical simulations, analytical perturbation theory, and mean-field approximations, the work uncovers mechanisms underlying anomalous transport, jamming transitions, and the breakdown of perturbative hydrodynamics.

The Question Of Money: State, Protest, And Informal Currencies In The Wake Of Greece’S Economic Crisis, Helen Panagiotopoulos

Dissertations, Theses, and Capstone Projects

Monetary unions are designed to foster political, social, and economic integration among member states by enabling the free movement of people, goods, services, and capital. Yet when a member nation faces economic crisis, citizens may respond by creating monetary systems of their own. This research asks whether such practices are simply demonstrations of human resiliency and adaptability, or whether they also challenge the very idea of a shared market and currency that do not align with national identity. Greece offers a crucial case for this inquiry. Following the 2008 debt crisis, austerity measures led to economic depression, mass unemployment, and …

Disability Theatre Communities: Engaging Artists And Audiences In Contemporary International Performance, Joseph Paul Hill

Dissertations, Theses, and Capstone Projects

“Disability Theatre Communities” examines how communities are constructed in, through, and around contemporary international disability theatre performances. It explores ideas of community formation and intersection across three case studies to elucidate the various ways in which disability theatre artists, productions, companies, and organizations attract, engage, and educate variable artist and audience communities. The project analyzes Rome, Italy’s Teatro Patologico and its Integrated Theatre of Emotion, a theatrical training program for neurodivergent performers; Wales-based writer, theatre-maker, and dramaturg Kaite O’Reilly, whose international collaborations center d/Deaf and disabled performers and foreground audience accessibility; and the biennial BIT (Blind in Theatre) International Festival …

The Sonic Hedgehog Effector Smoothened Modulates Cholinergic Interneuron Activity, Physiology, And Striatum-Dependent Behaviors, Santiago Uribe-Cano

Dissertations, Theses, and Capstone Projects

The striatum is a central node in action selection and associative learning, integrating cortical, thalamic, and neuromodulatory input. Among its principal modulators, dopamine (DA) and acetylcholine (ACh) are known for their temporally coordinated yet mechanistically distinct influences on striatal output. However, the upstream signals that regulate their dynamic interplay, particularly within cholinergic interneurons (CINs)—the primary source of striatal ACh—remain incompletely characterized. This dissertation investigates the role of Smoothened (Smo), a G protein-coupled receptor (GPCR) effector of Sonic Hedgehog (Shh) signaling, in modulating ACh signaling dynamics in the striatum.

Building on evidence that midbrain DA neurons co-release Shh and that CINs …

Nonlinear Optics Through Femtosecond Light-Matter Interactions, Shah Faisal B. Mazhar

Dissertations, Theses, and Capstone Projects

This dissertation offers experimental and theoretical insights into nonlinear light-matter interactions induced by intense femtosecond (fs) laser pulses. It investigates key phenomena, including stimulated Raman scattering (SRS) from phonon and magnon quasiparticles, supercontinuum (SC) generation via self-phase modulation (SPM), conical emission (CE) arising from four-wave mixing (4WM), and modulation instability (MI) driven by cross-phase modulation (XPM) between SRS and SC processes. These effects are studied in diverse media using state-of-the-art femtosecond lasers.

The interplay among SRS, SC, 4WM, and MI is examined to probe vibrational modes and temperature-dependent magnetic excitations in condensed-matter systems. Experiments are conducted on anisotropic uniaxial calcite …

Choreographies Of Care: Disability And Relationality In Performance, Kiera Bono

Dissertations, Theses, and Capstone Projects

My dissertation explores enactments of what I am calling “choreographies of care” in interdisciplinary performance practices in the 21^st century. Working across disability studies, race and ethnicity studies, queer theory, and performance studies, I investigate the ways in which chronically ill and disabled artists have generated multisensorial movement, sound, and performance works that resist normative understandings of time, space, bodies, and interactions between bodies. Focusing mostly on performances and events that I have attended in New York City or virtually over the past decade, my project engages directly with disability arts communities in which I have been deeply embedded …

Teaching And Technology: "You Can't Just Do The Same Thing Online", Sakina Laksimi

Dissertations, Theses, and Capstone Projects

This dissertation examines how faculty at the City University of New York navigated the abrupt transition to online teaching during the COVID-19 pandemic, revealing how pedagogy is shaped by technological, institutional, and social conditions. Drawing on twenty-two interviews with twelve faculty across eight disciplines, I use a grounded theory approach to analyze how instructors adapted courses, reimagined assessment, and sustained connection with students amid crisis. Three overlapping pedagogical orientations emerged: improvisational, relational, and design-based teaching. These approaches highlight how faculty balanced responsiveness, care, and intentional course design in environments mediated by digital platforms and marked by inequity. The study situates …

Relevant Deformations Of Brane Brick Models, Georgios P. Goulas

Dissertations, Theses, and Capstone Projects

The thesis studies relevant deformations of 2d gauge theories with $\mathcal{N}=(0,2)$ supersymmetry, realized on the worldvolume of D1-branes probing toric Calabi-Yau 4-folds. Brane brick models are the primary means for engineering such theories and streamlining their connection to geometry. In this thesis, we relevant deformations of brane brick models, focusing on a specific class of deformations in which the initial and final theories are both described by brane brick models. Relevant deformations serve as an additional, systematic way of generating these theories, as well as uncovering connections between them. Within the framework of brane engineering, these deformations acquire a geometric …

Non-Linear Heart Rate Variability: Investigating Cardiac Complexity Of Psychopathic Traits, Khaya A. Roach

Dissertations, Theses, and Capstone Projects

Psychopathy is a complex personality disorder characterized by distinct emotional and interpersonal deficits, and affects approximately 25% of the prison population and 4.5% of nonincarcerated populations. The manifestation of psychopathy can be understood through two distinct variants, each demonstrating unique etiological pathways and clinical presentations. Primary psychopathy is characterized by core interpersonal and affective deficits, including shallow emotions and manipulativeness, while demonstrating reduced autonomic responsivity and lower anxiety levels. Secondary psychopathy presents with higher levels of impulsivity, anxiety, and emotional dysregulation, showing stronger associations with various psychopathologies. Treatment outcomes also vary between the variants, with primary psychopaths typically showing poor …

Leveraging Stellar Chemistry For A Global View Into The Atmospheres Of Brown Dwarfs And Giant Exoplanets, Emily Calamari

Dissertations, Theses, and Capstone Projects

In the era of the James Webb Space Telescope (JWST), it is now possible to examine substellar mass atmospheres in unparalleled detail and precision. However, unraveling the complicated thermodynamics and chemistry in these atmospheres remains a challenge. Atmospheric retrievals are a leading data-driven technique capable of recovering an object’s fundamental parameters such as mass, radius, effective temperature, gravity, cloud structure and composition and chemical abundances. However, in directly imaged or isolated worlds, constraining and/or interpreting these fundamental parameters can be difficult, particularly as retrieval models try to parameterize the overall impact of clouds.

For my dissertation, I turned to main …

Towards Automated Evolution Of Imperative Deep Learning Programs, Tatiana Castro-Vélez

Dissertations, Theses, and Capstone Projects

Software engineering (SE) is increasingly intersecting with data-centric domains such as machine learning (ML) and deep learning (DL). Similar to bugs in traditional software systems, defects can emerge in ML and DL systems. ML, including DL, systems are now widespread and rely on dynamic models defined by input data. Developers face the challenge of building dependable systems while addressing the demand for scalable software.

Efficiency is essential to support responsiveness with respect to ever-growing datasets. Traditional DL frameworks achieve scalability through deferred execution, enabling symbolic, graph-based deep neural network (DNN) computation. While efficient, this approach is error-prone, cumbersome, and difficult …

Multi-Nuclear Magnetic Resonance (Nmr) Characterization Of Novel Materials, Tawhid Pranto

Dissertations, Theses, and Capstone Projects

The increasing reliance on batteries in commercial products, coupled with the environmental challenges posed by climate change and the limitations of fossil fuel consumption, has created strong financial and environmental incentives to explore innovative energy storage solutions. Renewable energy sources are being actively developed, but their intermittent nature necessitates efficient storage technologies, driving significant research into improving the performance of batteries, fuel cells, and capacitors.

This thesis focuses on the application of advanced Nuclear Magnetic Resonance (NMR) spectroscopy to study and understand novel materials for energy storage applications, with an emphasis on electrolytes for rechargeable lithium-ion batteries and all-solid-state batteries. …

Toward A Generalizable Perceptual Hashing Framework For Image Manipulation Detection, Priyanka Samanta

Dissertations, Theses, and Capstone Projects

This thesis contributes to research in adversarial image manipulation detection. The primary motivation is the increasing need to verify digital images, especially for legal evidence, journalistic proof, or social media content—where manipulated or fabricated images can mislead, defame, or distort reality. A key application and contribution of this work is the development of eWitness, a blockchain application that generates and registers image provenance at capture time to enable independent verification of authenticity. The secret sauce behind the system is SmartHash, a novel and efficient perceptual hashing algorithm designed for real-world deployment in systems like eWitness. Unlike existing algorithms, SmartHash targets …

Asian American Artists, Improvisation, And Collaboration, Johnna Wu

Dissertations, Theses, and Capstone Projects

The purpose of my dissertation is to explore how contemporary Asian Americans artist-performers have formulated their identities through collaborations with the Association for the Advancement of Creative Musicians (AACM). The project addresses issues in the existing literature on this topic and provides an alternative framework of cosmopolitanism to understanding the multidimensional aspects of artistic collaborations. The dissertation examines the history of the AACM and the Asian American improvisers and reveals ideological differences among its members on how music should reflect their identities. These histories paved the way for the artist subjects of my three case studies: Miya Masaoka, Vijay Iyer, …

The Salience Of Function Words In Implicit Statistical Linguistic Learning: An Erp Investigation, Daniel M. Schwartz

Dissertations, Theses, and Capstone Projects

Research has indicated that children and adults can implicitly learn language patterns; however, questions still remain regarding the role and nature of implicit learning, particularly of sequential patterns. Implicit statistical learning is a type of unconscious learning of sequential patterns, which may be especially relevant to phrase structure learning. Prior studies have highlighted the differential processing of function words (FWs), such as determiners, relative to content and nonsense words and have also pointed to particular neural response patterns (specifically, Anterior Negativity, or AN) to early syntactic violations. To date, there is relatively little work directly investigating the role of FWs …

The Effect Of Tbi On Working Memory And Anxiety In Rats, Mariola Sobolewska

Dissertations, Theses, and Capstone Projects

Traumatic Brain Injury (TBI) is a significant public health concern, often leading to cognitive and emotional impairments. This study examined the effects of TBI on working memory and anxiety-like behavior in young male Sprague-Dawley rats using the Radial Arm Maze (RAM) and Elevated Plus Maze (EPM), which are behavioral assessments. The RAM tests spatial working memory by evaluating the animal’s ability to remember and efficiently navigate multiple arms to retrieve rewards. The EPM assesses anxiety-like behavior based on the animal’s preference for open versus closed arms. The study utilized young male Sprague-Dawley rats, a well-established rodent model known for its …

Form And Structure In African Music: Four Case Studies In San, Por Por, Ewe, And Aka Music, Bai Xue

Dissertations, Theses, and Capstone Projects

This dissertation examines the organizational principles in African music through the analysis of four distinct musical traditions: the San music of Southern Africa, Por Por honk-horn music of urban Accra (Ghana), the Northern and Southern Ewe music of Ghana, and the Aka music of the Central African Republic. While the study of African music has often emphasized its sociocultural and rhythmic aspects, structural principles have remained a relatively underexplored subject. This study argues that African music is highly structural yet should not be analyzed as fixed blueprints. Instead, it introduces a “block-based method” for analyzing oral music, the first step …

Nuclear Magnetic Resonance Characterization For The Study Of Beyond Lithium-Ion Battery Electrolytes, Allen Zheng

Dissertations, Theses, and Capstone Projects

To achieve a sustainable future, key issues in the energy and construction sectors such as the transition from fossil fuels to renewable energy sources and recycling of waste construction materials must be addressed. While fossil fuels offer a high energy density source of quick, consistent energy, renewable energy sources such as wind, solar, and hydroelectric offer intermittent energy output, requiring energy storage systems to maintain steady energy availability for consumers. Lithium-ion batteries (LIBs) are widely used in consumer electronics, electric vehicles, and grid storage due to their high energy density, low self-discharge, and rechargeability. However, they are limited by high …

Mechanistic Insights Into The Neuroprotective Effects Of The Antidepressant Agomelatine In Alzheimer's Disease, Grace Terry

Dissertations, Theses, and Capstone Projects

Alzheimer’s Disease (AD) is a complex neurodegenerative disease that has limited treatment options and no cure. AD is characterized by robust pathology including extracellular amyloid beta plaques, intracellular neurofibrillary tangles, neuronal and synaptic loss, neuroinflammation, and brain atrophy. AD presents with cognitive decline and memory loss but only years after neuropathology has started to accumulate. This robust pathology has made AD difficult to treat and highlights the need for therapeutics that modulate multiple pathways. Agomelatine (AGO) was selected by a high-throughput machine learning drug repurposing algorithm by our collaborator Dr. Lie Xie (Hunter College Dept. of Comp. Sci.) as having …

Repurposing Atractylenolide Iii, A Natural Anti-Inflammatory Compound, For Alzheimer’S Disease, Angela M. Steele

Dissertations, Theses, and Capstone Projects

Alzheimer’s disease (AD) is a debilitating neurological condition ranked as the fifth leading cause of death in adults over the age of 65. Despite the severity, 98% of drugs have failed as treatments for AD. Current novel drug development approaches have been unable to produce a disease-modifying treatment as they often have a one-target approach, not accounting for the complex nature of the disease. One of the hallmarks of the disease, inflammation, may provide a better target for treatment because it interacts with multiple facets of the disease. Drug repurposing to identify compounds that mitigate inflammation in AD could provide …

Text-Based Propaganda Detection, Vivek Sharma

Dissertations, Theses, and Capstone Projects

In the digital age, the swift consumption of news and the widespread dissemination of propaganda significantly threaten democratic principles and informed decision-making. News organizations, often aligned politically, tailor their content to appeal to specific audiences, thereby perpetuating biases. Despite advancements in detecting propaganda through various computational techniques, including Large Language Models(LLM) and BERT-based approaches, significant challenges persist concerning data availability and the effectiveness of detection tools. This thesis explores the landscape of text-based propaganda and reviews related research in textual analysis. It introduces a novel method for collecting a social-media based dataset, which includes analysis of journalists' tweets to discern …

The Architecture Of Exclusion: Disability, Race, And The History Of New York City’S 600 Schools, Francine Almash

Dissertations, Theses, and Capstone Projects

This dissertation investigates the largely erased history of New York City’s 600 schools—segregated public schools created to house students labeled as emotionally disturbed or socially maladjusted. These institutions, operating throughout the mid-20th century, disproportionately served Black and Puerto Rican youth, many of whom were placed in these schools under vague behavioral criteria and with little to no pathway for return to general education settings.

Combining archival research, longitudinal policy analysis, historical media review, and critical race and disability studies frameworks—including DisCrit (Disability Critical Race Theory)—this project situates the 600 schools at the intersection of institutional racism and ableism. It argues …

Investigating The Role Of Early Growth Response 1 (Egr1) Gene In Riluzole-Induced Apoptosis In Osteosarcoma, Syeda Maryam Azeem

Dissertations, Theses, and Capstone Projects

Osteosarcoma is a rare but aggressive bone malignancy most commonly affecting adolescents and young adults (AYA). With 5-year survival rate stagnating over the last four decades despite the advancements in multi-modal therapy, drug repurposing offers a rapid path to new osteosarcoma treatments. Recent studies suggest that Riluzole, a drug approved for amyotrophic lateral sclerosis (ALS), may be repurposed for osteosarcoma treatment due to its ability to slow tumor progression and induce apoptosis. Previously, we have shown that Riluzole increases reactive oxygen species (ROS), activating c-Abl, which phosphorylates YAP in the nucleus. YAP then forms a complex with p73 to enhance …

Online Resources For Oral Communication Courses, Sean P. Palmer

Dissertations, Theses, and Capstone Projects

Online resources focusing on oral communication skills are lacking, even as online education itself expands. While I was aware of this lack, I didn’t realize its severity until LaGuardia Community College went fully remote during the 2020 global pandemic, and I was looking for online tutoring aids for oral communication. Furthermore, the information presented online is frequently unsuitable for the purposes of online pedagogy due to its specialized and jargony mode of presentation. Also, many existing assignments involving oral communication assume public speaking as the default model, despite the growing importance of emergent digital modes of oral performance, like podcasting …

Some Puzzles Concerning Gujarati Nominalized Verbs In Before And After Sentences, Priya P. Patel

Dissertations, Theses, and Capstone Projects

Aspect, which relates events to time periods, interacts in complex ways with temporal operators. This complexity is exemplified in the Gujarati language, where certain imperfective nominalized verbal forms are considered unacceptable with the temporal operator pachi (after) but not with pehlaa (before). This paper aims to shed light on this semantic unacceptability by combining insights from prior studies relating to aspect in other Indo-Aryan langauages with previous work done on English before and after.

Between The Buffer And The Black Box: Ed(1), Invisible Text, And Delegation In Word Processing, Kai Prenger

Dissertations, Theses, and Capstone Projects

This thesis provides a media archaeological and theoretical examination of ed(1), the Unix line editor developed by Ken Thompson at Bell Labs in 1969, arguing that its approach to "invisible text" processing established lasting patterns of human-computer collaboration that persist in contemporary digital systems. Through historical research, technical analysis, and critical interpretation, this study demonstrates how ed(1) embodied a particular epistemology of text processing that appears alien in a contemporary context, but proves insightful in the age of generative text creation.

ed(1) emerged from the unique convergence of Bell Labs' collaborative research culture, severe hardware constraints of early Unix systems, …

From Stories To Strategy: Oral Histories As Qualitative Evidence For Neighborhood Planning, Randip K. Parhar

Dissertations, Theses, and Capstone Projects

Developments in neighborhood planning have sought more grounded and community- engaged approaches to space and service design. This capstone project examines how oral history recordings can serve as a data source for neighborhood planning. It asks “How can computational methods of analysis be applied to oral history recordings to provide a source of information for neighborhood planning?” using Jamaica, Queens, as a testbed. Using R as a computational tool, the project applies foundational text mining techniques, such as term frequency analysis, n-gram analysis, and topic modeling, to explore patterns and themes within the recorded narratives. These methods can provide a …