Digital Commons Network^™

Characterization Of The Intrinsic Neural Timescale Indices As A Reliable Fingerprint Of Brain Dynamics, Helya Honarpisheh

Dissertations and Theses

Intrinsic neural timescales (INTs) characterize the persistence of neural activity over time and offer insight into the brain’s temporal hierarchy. This thesis evaluates and compares six autocorrelation-based INT metrics—AR(1) Coefficient (Autoregressive Coefficient at 1), First Zero Lag, Lag at ACF = 1/e, Sum of Positive ACFs, ACF at Half Lag, Exponential Decay Constant (τ)— using resting-state fMRI data from 400 cortical regions across a large, lifespan sample (ages 6– 85) from the NKI-Rockland dataset. A discriminability analysis revealed that the AR(1) coefficient provided the highest test-retest reliability and individual specificity across repeated scans, establishing it as the most reliable INT …

Metasurfaces And Their Applications In Photonic Devices, Shuwei Guo

Dissertations and Theses

Metasurfaces are flat artificial optical elements composed of dielectric and/or metallic nanostructures. They can manipulate light in unprecedented ways by altering amplitude, phase, and polarization at subwavelength scales. The ability of these two-dimensional elements to perform multiple optical functions within compact optical systems—while offering high functionality, small form factors, and easy integration into optoelectronic devices—has sparked significant interest across various fields and industries. These applications span imaging, sensing, nonlinear and quantum optics, optical computing, automotive technology, augmented and virtual reality, and more.

In this dissertation, we explore and design new multifunctional metasurfaces with a focus on manipulating spectral responses. First, …

Using Deep Neural Nets In Writer Identification & Analysis, Aditya Majithia

Dissertations and Theses

This thesis focuses on developing automated deep learning methods for writer identification and writer attribute prediction from handwriting. It introduces two novel architectures: Convolutional Transformer Encoder (CTE) and Convolutional Swin Encoder (CSE). CTE is designed for determining authorship from handwritten text, be it modern or historical handwriting. CTE tracks subtle features and cues from handwriting strokes to distinguish authorship. It is the first of its kind capable to operate on historical handwritten fragments, setting it apart from existing methods that rely on entire document pages. CSE is designed to determine multiple attributes of an author such as authorship, gender, age …

Utilizing Deep Learning Audio Models For Blind And Low Vision Crosswalk Assistance, Wayne Lam

Dissertations and Theses

Navigating urban environments poses significant challenges for blind and low vision (BLV) individuals, particularly at street intersections where determining when it is safe to cross can be life-threatening. In New York City, where pedestrian fatalities are on the rise and only 2% of intersections are equipped with Accessible Pedestrian Signals (APS), alternative solutions are urgently needed. This thesis proposes an audio-based deep learning approach to support BLV individuals at crosswalks by detecting traffic movement direction and idling states using spatial sound. With 4-channel audio capturing capabilities of wearables, such as Meta Project Aria glasses, we explore state-of-the-art sound event localization …

Cognitive Map Generation For Vision And Language Navigation, Alexander Sandoval Mesa

Dissertations and Theses

Visual-Language Navigation (VLN) presents significant challenges for autonomous agents, such as robots and virtual assistants, particularly in complex, dynamic environments where the seamless integration of visual perception and natural language understanding is critical. Traditional VLN systems often struggle with effectively aligning language instructions and visual scene understanding, limiting their adaptability and navigation efficiency.

This thesis proposes a novel Cognitive Map-based framework that addresses these challenges by transforming natural language navigation instructions into structured graph representations. The Cognitive Map consists of nodes representing waypoints, landmarks, decision points, and edges encoding spatial relationships and navigational actions. These maps are generated using Large …

Multi-Material Adhesive Bonded Joints Under Static And Dynamic Loading, Gizem Derya Demir

Dissertations and Theses

Adhesively bonded joints present significant potential for reducing structural weight and enhancing performance in modern and future engineering structures. By enabling the elimination or reduction of traditional mechanical fasteners and facilitating the integration of dissimilar materials, adhesives can contribute to more efficient, lightweight designs. However, to fully leverage these benefits—especially in high-performance applications—adhesive materials must exhibit robust behavior under both static and dynamic loading conditions, such as ballistic impact. Despite their promise, the failure mechanisms of adhesives under such high-strain-rate scenarios remain insufficiently understood.

This dissertation investigates the performance of adhesively bonded multi-material joints subjected to static loading and ballistic …

Data Driven Bridge Deck Deterioration Modeling And Maintenance Intervention Scheduling, Deepak Kumar

Dissertations and Theses

Majority of over 617,000 bridges across the United States are significantly impacted by environmental factors, aging materials, and heavy traffic loads. According to the 2021 Infrastructure Report, nearly 231,000 bridges require repair or preservation work, with 46,154 (7.5%) being classified as structurally deficient, thereby posing risks for mor than 178 million daily trips across these bridges. Despite recent improvements, 42% of U.S. bridges are at least 50 years old, underscoring an urgent need for increased investment to meet repair demands. The nation’s backlog of bridge repairs is estimated at $125 billion, with a 58% increase in annual spending required to …

Generation And Characterization Of Human Blood-Brain Barrier Models For Investigating Neuropsychiatric Disorders And Tumor Metastasis, Yunfei Li

Dissertations and Theses

The blood–brain barrier (BBB) is important in the normal function of the central nervous system (CNS). An altered BBB has been described in various neuropsychiatric disorders. The brain-specific microvascular endothelial cell (BMEC) is an essential structural component of the BBB. To test if integrity of the BBB formed by BMECs is compromised in 22q11.2 deletion syndrome (also called DiGeorge syndrome), which is one of the validated genetic risk factors for schizophrenia, a 2D iBBB (induced BBB) on a Transwell filter was generated from human microvascular endothelial cells (HBMECs) derived from the induced pluripotent stem cells (iPSCs) out of patients with …

Experimental And Analytical Investigation Of Particle Dynamics In Newtonian And Non-Newtonian Fluids In A Taylor-Couette Cell, Andres F. Velez Mendoza

Dissertations and Theses

This doctoral dissertation investigates heavy particle sedimentation in Newtonian and non-Newtonian fluids, aiming to understand their behavior in Drilling Fluid (DF) systems used in oil and gas industry, where such phenomenon can lead to operational issues such as lost circulation, well control problems, and even blowouts. To simulate DF dynamics under operational conditions, this study utilizes a Taylor-Couette (TC) cell, which consists of a rotating inner cylinder and a stationary outer cylinder separated by a 9.0 mm annular gap. The TC cell allows for the investigation of the sedimentation behavior of spherical particles within both Newtonian fluids (deionized water and …

Deep Learning Architectures For Improving Weather Research And Forecasting (Wrf) Precipitation Estimates And Landslide Susceptibility Mapping: A Case Study Of Puerto Rico, Said A. Mejia Manrique

Dissertations and Theses

Precipitation is a critical factor in the Earth’s hydrological cycle and has a profound impact on various environmental and socioeconomic systems, including management of water resources, flood forecasting, and the evaluation of natural hazards, particularly those associated with rainfall-induced landslides. For the latter, obtaining precise precipitation estimates is essential, as intense rainfall events can trigger landslides that pose significant risks to human life, infrastructure, and ecosystems, particularly in mountainous regions. Puerto Rico (PR), with its mountainous terrain, tropical climate, and vulnerability to hurricanes, provides a unique environment for studying precipitation patterns and the need for accurate rainfall estimates. The complex …

An Exploration Of Object Representations And Defense Mechanisms In Caregiver-Child Dyads On The Thematic Apperception Test, Hannah L. Bloom

Dissertations and Theses

Caregiver-child interactions, beginning in infancy, are essential for socio-emotional development. Through these exchanges, caregivers impart fantasies, fears, and beliefs—both consciously and unconsciously—that shape the child’s internal models of self and others (object representations) and strategies for managing intense emotions (defense mechanisms). Historically, projective tests, such as the Thematic Apperception Test (TAT), have been used to explore these constructs. In the TAT, participants craft narratives based on images that portray characters in different emotional states and interpersonal situations. Through their responses, participants project elements of their own internal world into the stories they create. Despite the TAT’s success in differentiating diagnostic …

The Role Of Social Inequality In The “Feminization” Of Borderline Personality Disorder, Jane Goldie Ekhtman

Dissertations and Theses

Borderline personality disorder (BPD) is a severe and prevalent mental illness that is three times more likely to be diagnosed in women than men. BPD research has attempted to explain this gender disparity, with clinician gender bias emerging as a possible factor. Yet, no research to date has examined the role of social status in the overdiagnosis of women with BPD. There is merit in examining BPD through a class lens as low SES is a risk factor for BPD, poverty and income inequality disproportionately affect women, and low status is associated with stereotypical traits of femininity. Additionally, mental health …

A Wall Of Smoke: Understanding The Drivers Of The June 2023 Canadian Wildfire Smoke Event For New York City, Gregory S. Randazzo

Dissertations and Theses

The 2023 Canadian wildfire season was notable for its extent and the dense smoke it produced. Motivated by the resulting air quality impacts in the New York City region, we explore how the total particulate matter output from the Quebec fires influenced PM2.5 concentrations downstream in New York City. Using injection height data from the Regional Advanced Baseline Imager + VIIRS Emissions dataset, we relate the tropospheric injection heights of the fires with the broader synoptic context and surface PM2.5 concentrations. Using data from the NYS Mesonet Profiler Network, radiosondes, and ERA5 reanalysis, we document the connection between an anomalous …

Using Trace Gas Measurements As A Transport Diagnostic For Tropical Convection: A Combined Model And Observation Study, Albane Hoxha

Dissertations and Theses

No abstract provided.

Developing A Global, Multi-Decadal (1983-2017) Convection Tracking Database Utilizing Isccp Hxg Data, Yuliya Selevich

Dissertations and Theses

Deep convective systems play a crucial role in Earth's climate system, yet tracking their behavior over large spatial and temporal scales remains challenging. This study introduces a new global convection tracking database spanning July 1983 to June 2017, developed using the ISCCP H-Series Pixel-Level Gridded (HXG) dataset and the object-based TOBAC (Tracking and Object-Based Analysis of Clouds) framework. By applying multi-threshold feature detection, segmentation, and linking algorithms to infrared brightness temperature fields, convective systems are systematically identified and tracked through their life cycles. The resulting database provides a rich set of structural, dynamical, and radiative properties for over 67 million …

Political Regimes And Social Well-Being In The Sahel: An Analysis Of Gendered Development And Children's Education, Binta Fv Diarra

Dissertations and Theses

This thesis explores how divergent governance structures in the Sahel, specifically in Burkina Faso, Chad, Mali, and Senegal, affect the region's human development. Emphasizing gendered vulnerabilities and education, the research examines how political structures and leadership priorities deeply influence access to education and healthcare, specifically for women.

Authoritarian regimes often centralize power and prioritize regime stability over public welfare, leading to chronic underfunding of education and health services. In Mali and Burkina Faso, repeated coups and insecurity have affected schools and hospitals, disproportionately affecting girls and displaced women. Chad's one-party dominance reflects how systemic exclusion and poor service delivery entrench …

Peacekeeping In Sierra Leone And Mali, Ishaka Kondeh

Dissertations and Theses

This thesis examines the effectiveness of peacekeeping missions in promoting democracy, protecting human rights, and implementing Disarmament, Demobilization, and Reintegration (DDR) programs in post-conflict Sierra Leone and Mali. By analyzing the United Nations Mission in Sierra Leone (UNAMSIL) and the United Nations Multidimensional Integrated Stabilization Mission in Mali (MINUSMA), this research explores the impact of these missions on Mali still in conflict and long-term peacebuilding. The study focuses on three critical areas: supporting democratic governance, ensuring human rights protections, and successfully reintegrating former combatants into society. Through a comparative approach, this research analyzes why some peacekeeping missions succeed and then …

Examining Drug Policy In Portugal And Greece, Collin Fernandes

Dissertations and Theses

This thesis examines the divergent drug policies implemented in Portugal and Greece, analyzing why Portugal's comprehensive decriminalization model has been more successful than Greece's partial approach. Since 2001, Portugal has pioneered a drug policy that decriminalizes all drugs for personal use while investing in harm reduction services, rehabilitation, and social reintegration. In contrast, Greece maintained criminalization while implementing more limited harm reduction measures, particularly through OKANA (the Organization Against Drugs). The research highlights how economic factors, particularly the 2008 financial crisis and austerity measures, negatively affected both countries' programs but hit Greece's initiatives with greater severity. Portugal's programs have remained …

Soviet-American Relations During The Cold War: What Policies And Circumstances Conspired To Unravel The Soviet Empire?, John W. Krey

Dissertations and Theses

The two victorious superpowers of World War II – America and the Soviet Union – conceived and implemented unilateral foreign policies amid an atmosphere of intense hostility and suspicion of each other’s international intentions. Regardless of Moscow’s acquiescence in joining the United Nations and resolving a host of disputes (for example, the Security Council veto) regarding the establishment and operation of the same organization, it threatened to disequilibrate power relations between the US and the Soviet Union in the immediate aftermath of the second world war, which convinced Washington to develop the containment policy, a defensive realist posture for repelling …

Beyond The Threshold Of Protection: Examining Non-Refoulement's Erosion In Contemporary Refugee Law Through The Eu-Turkey Agreement, Aya Osman

Dissertations and Theses

This thesis examines the contemporary relevance and practical implementation of the principle of non-refoulement as established in the 1951 Refugee Convention. While this fundamental principle of international refugee law prohibits the return of individuals to countries where they face persecution, torture, or human rights violations, its widespread violation by state parties raises critical questions about its continued effectiveness and the broader validity of the Convention's framework in today's global context. Through a methodological approach combining legal analysis and case studies of state practices, this paper investigates whether the 1951 framework remains valid and in effect when addressing refugee and immigration …

The Rise Of China: Economic Expansion, Military Modification And The Belt And Road Initiative, Felix Padilla

Dissertations and Theses

In order to analyze China’s rise in power, we have to examine how China has achieved this growth. We need to observe their domestic reforms, international initiatives like the Belt and Road Initiative (BRI), and strategic military advancements. This thesis focuses on China’s economic integration, market reforms and military modernization. The thesis uncovers the effects of this rise on global governance and power balances, especially in trade, security, and geopolitics. I analyze China's vision of a multipolar world and how it contrasts with the current global order and how this fuels rivalry with the U.S. and other powers. China's rise …

Examining The Complex Interplay Of Stress, Social Support, And Drinking Motives On Alcohol Use Behaviors: A Moderated Mediation Model Among College Students, Sabrina Perrin

Dissertations and Theses

College student alcohol use remains a public health concern, yet the psychological and social mechanisms that contribute to high-risk drinking patterns are not fully understood. Guided by the motivational model of alcohol use and stress-buffering theory, this study tested a moderated mediation model to examine how perceived stress, coping motives for drinking, and perceived social support interact to influence alcohol use behaviors. A sample of over 1,100 diverse urban college students completed measures of stress, social support, drinking motives, and four alcohol-related outcomes: binge drinking, frequency of alcoholic drinks consumed, negative drinking consequences, and use of protective behavioral strategies (PBS) …

Testing An Educational Intervention To Improve Recognition And Understanding Of Emotional Manipulation In Romantic Relationships, Tiss Zaitz

Dissertations and Theses

Romantic relationships significantly impact happiness and well-being, yet rarely is it taught how to build them or recognize unhealthy relationship dynamics. This gap has profound implications, as Emotional Manipulation (EM) can have severe and lasting consequences. This study examined whether an educational intervention could improve participants' ability to recognize and understand EM in interpersonal relationships. Participants (N = 327) completed a pretest assessing recognition and comprehension of EM and were then given an answer sheet with detailed explanations to enhance understanding. A subset (n = 46) completed a posttest to measure changes in recognition and knowledge. Results showed significant improvement …

Unveiling Invisible Wounds: Experiences Of Racial Microaggressions, Racial Gaslighting, And Mental Health Among Racially And Ethnically Minoritized Adults, Supriya Pandit

Dissertations and Theses

Racial microaggressions are momentary, subtle, and often unintentional comments or behaviors that nonetheless communicate negative race-based messages towards racially and ethnically minoritized individuals. Given the accumulated and differential impact of racial microaggressions on individuals' mental health over time, it is crucial to investigate its associations with specific mental health symptoms and intrapsychic alleviating factors. To further clarify which coping strategies for racial microaggressions can be more empowering versus harmful, it is also crucial to investigate the processes and mental health consequences that unfold when individuals choose to challenge racial microaggressions, such as racial gaslighting. Racial gaslighting is an insidious interpersonal …

The Transformative Power Of An Ethic Of Care In Patricia Piccinini’S Mythic Posthuman Offspring, Keely Parrish

Dissertations and Theses

This thesis examines the contemporary artist Patricia Piccinini and her posthuman hybrid creations within the context of a feminist ethic of care. Largely referring to scholarship by the political scientist Joan C. Tronto, I argue that Piccinini expands the definition of an ethic of care to include non-human entities as well as human ones. The four phases of care identified by Tronto will serve to outline the encounter between the audience and Piccinini’s work to see how humans and non-humans (1) care about, (2) take care of, (3) give care and (4) receive care from each other, as well as …

Revelations: Spirituality As Privileged Perspectivism In Magical Realist Distortions, Isabella Scala-Kazanecki

Dissertations and Theses

This thesis examines the role of spiritual beliefs in the literary mode now known as magical realism in Cuban Alejo Carpentier’s The Kingdom of This World (1949), Indian-Born British and American Salman Rushdie’s The Satanic Verses (1988), and a lesser-known novel, Household Saints (1981) by Francine Prose, an American writer. The Kingdom of This World, itself the originator of the mode of magical realism, has allowed me to conclude with Carpentier that magical realism arises from “privileged revelations,” as he notes in the preface to his seminal book. But these revelations in magical realism are not necessarily always of the …

Living By The Sword: Religiosity And The Terrorist Subculture Of Russian Revolutionaries, 1904-1910, Gregory I. Mcevoy

Dissertations and Theses

The Marxist dictum of “religion is the opiate of the masses” has led to a prevailing assumption in scholarship that the socialist movements of the early twentieth century have been inherently atheistic. Religion is often associated as a remnant of old, antiquated society and incompatible with the claimed modernity of socialist progress. This assumption has led to overlooking the religiosity within certain radical movements and revolutionary culture at large. Scholarship on the political underground in Tsarist Russia has, thus far, perpetuated this impression. While it is the true that the Bolsheviks and Leninist Social Democrats rejected religion as obscurantist and …

Posters, Propaganda, & Bloody Saturdays: Making China Christian: How Media & Missionaries Made China Christian, Kristy Lee

Dissertations and Theses

This thesis investigates the role of religious groups and media in influencing the public perception of Chiang Kai-shek and the Kuomintang during the Second Sino-Japanese War.

Defining ‘Un-Americanism’ In Culture And Art: The Dies Committee’S Investigation Of The Federal Theatre Project, Matthew G. Summers

Dissertations and Theses

This thesis explores the House Un-American Activities Committee’s (HUAC) expansive definition of ‘Un-Americanism’ through the body’s 1938 investigation of the Federal Theatre Project (FTP). The committee, then known as the Dies Committee after its chairman Martin Dies (D-TX), publicly presented the hearings as an attempt to root out communism in a deeply compromised government program. And indeed the FTP, an ambitious New Deal Program to provide work for unemployed professionals in the theatre, had an undoubtedly leftist bent. However, the hearings were consistently focused on the project's progressive stances on issues of race and gender, and effectively exposed the underlying …

Asian-American Literature And The Family Saga: Cyclical Histories Of Racial Melancholia And Racial Dissociation, Molly Schwarz

Dissertations and Theses

This paper analyzes the novels The Namesake by Jhumpa Lahiri, Pachinko by Min Jin Lee, and Miss Burma by Charmaine Craig and argues how the family saga within Asian American literature draws out elements of the diaspora to best share histories across different ethnic and racial groups. There is a brief overview of the development of Asian-American literature and an explanation of how hyphenated identity is intrinsic to diasporic literatures, and then further discussion of how each of these novels contributes to the legacies of Asian-American writing and storytelling. Then, each novel is analyzed for how the various family saga …