Digital Commons Network^™

Analysis Of Energy Savings And Feasibility Of Retrofitting New York City Midrise Multifamily Buildings With Air Source Heat Pump Technology, Samuel Chussid

Dissertations and Theses

Motivated by reducing impacts of climate change due to greenhouse gas emissions, many dense urban cites throughout the United States have set into law ambitions decarbonization policies that will require buildings to replace fossil fuel space and water heating systems with electric powered alternatives. In many cities, especially in the northeast, fossil fuel space and water heating systems are used in a vast majority of buildings and significantly contribute to citywide carbon emissions. In New York City (NYC), it is estimated that over 40 percent of citywide emissions come from space heating and water heating systems that run on fossil …

Liquid-Amine Infused Surfaces For Carbon Capture, Pedro Bertolini

Dissertations and Theses

The release and accumulation of carbon dioxide in the atmosphere during the burning of fossil fuels is considered the primary contributor to climate change. Efficient and high-capacity technologies that can remove CO₂ from (i) point sources (e.g. exhaust streams) and (ii) directly from air (i.e. direct air capture (DAC)) are the key towards reversing the elevated levels of atmospheric CO₂.

Here, we study a novel technology (solid with infused reactive liquid (SWIRL)) which integrates liquid infused surfaces in flow-through geometries to form systems that have large interfacial surface areas per unit volume. The chemistry of the surfaces …

Implementation Of Acid/Gas Digestion Approach To Maximize Volatile Fatty Acids Production From Municipal Sludge And A Techno-Economic Feasibility Study, Aykut Sayin

Dissertations and Theses

Acid digestion, which is the first step of two-phase acid/gas anaerobic digestion process, was studied to identify the optimum operating conditions that would maximize the production of volatile fatty acids (VFAs). Batch and semi-continuous acid digesters were operated using combined primary sludge and waste-activated sludge as the feedstock from New York City (NYC)’s Wards Island water resource recovery facility (WRRF). Operating conditions tested in batch acid digesters for maximizing VFAs production included temperature (35-70°C), inoculum-to-substrate ratio (0.0-0.5 mgVS/mgVS), thickening (3-13%TS), and contact time (0-10 days), while simultaneously inhibition mechanisms on VFAs production were investigated. Once the optimum operating conditions for …

Modulation Of Motor Learning With High-Intensity Transcranial Electric Stimulation, Gavin Hsu

Dissertations and Theses

Research thus far on noninvasive, transcranial electric stimulation have produced mixed results from in vivo human experiments. This work tests the hypothesis that applying higher stimulation intensities would induce intracranial electric fields that more closely match the higher magnitudes used in animal and in vitro studies and subsequently yield more robust effects. As done commonly in the literature, we targeted the motor cortex (M1), specifically in the context of neuroplastic changes taking place during motor learning in healthy adult humans. This work also seeks a better understanding of the neural correlates underlying motor skill learning.

Through multiple large-sample studies, this …

Orbital And Spin Angular Momentum Light Generation, Interactions, Special Photons, And Applications In Liquids, Solids, Vapors And Biological Tissue Media, Sandra Mamani Reyes

Dissertations and Theses

Photons possess many characteristics such as wavelength, coherence, speed, polarization and wavefront. The aim of this thesis is the study of two salient properties of light exploring light carrying polarization and space degree of freedom of the wavefront. The wavefront of light is complex with different states of polarization. Special light beams are generated and characterized for interaction with liquids, solids, vapors, and bio- materials to understand fundamental processes such as Transmission, Raman scattering, and Optical Kerr Effect in steady state and temporal domains.

It has been more than hundred years since it is known that light can carry other …

The Racial Disparities Of The Gamma-Secretase/Notch Pathway And Inhibition In Triple Negative Breast Cancer, Jobin Joseph

Dissertations and Theses

Triple Negative Breast Cancer (TNBC) continues to be a formidable challenge in oncology, characterized by its aggressive phenotype and limited treatment options. Alarming racial disparities in TNBC outcomes persist, with underrepresented populations experiencing disproportionately higher rates of mortality and poorer prognoses. This master's thesis aims to delve into the molecular intricacies that contribute to these disparities, with a specific focus on gamma secretase activity, a key regulator of cellular processes.

The research methodology encompasses a multi-faceted approach, amalgamating clinical data analysis with extensive in vitro and in vivo experimentation. The study employs cutting-edge molecular profiling techniques and gene expression analysis …

Ring Resonators Intergrating With Dichoric Materials And In Spin-Valley Controlled Photonic Topological System, Yuma Kawaguchi

Dissertations and Theses

Photonic technology plays an important role in the development of diverse applications, ranging from optical telecommunications to sensing and imaging. The utilization of photonic circuits emerges as a promising platform for the establishment of advanced communication systems characterized by high speed and large capacity. This advancement is crucial to facilitate fast and efficient data transfer while concurrently managing multiple devices. It is imperative that essential components such as lasers, modulators, and isolators exhibit compactness without incurring significant losses.

Non-reciprocal devices represent a valuable addition to photonic circuits, enabling the creation of unidirectional waveguides that function as optical isolators, preventing signals …

Alkaline Potassium Polyacrylate Electrolytes For Rechargeable Zinc-Manganese Dioxide Batteries, Jungsang Cho

Dissertations and Theses

Zinc (Zn)–manganese dioxide (MnO₂) rechargeable batteries have high specific theoretical capacity as well as being environmentally friendly, intrinsically safe and low-cost. Liquid electrolytes, such as potassium hydroxide (KOH), are historically used in these batteries; however, many failure mechanisms of the Zn–MnO₂ battery chemistry result from the use of liquid electrolytes, including the formation of electrochemically inactive compounds and shape change of Zn electrodes during charge and discharge cycling. This led to incorporation of an alkaline polymer electrolyte as an alternative to the liquid KOH electrolyte in Zn-MnO₂ rechargeable batteries, with the aim of making them non-spillable …

Surface Activity At The Air-Water Interface And Self-Stratification Of Silica Nanoparticles Functionalized With Tri-Methoxy Poly(Ethylene Glycol) Silane, Hyeongoo Jung

Dissertations and Theses

Aggregated silica nanoparticles (SNPs) have been functionalized with tri-methoxy poly(ethylene glycol) silane (mPEG silane), end-capped with a methyl group. This functionalization imparts surface activity at the air-water interface due to the hydrophobic nature of the end-capped methyl group. To determine the surface coverage of silane on the particle surface, solution-state ¹H-NMR spectroscopy was utilized for characterization, and surface tension measurements were conducted to assess their tension-lowering ability. Solutions containing 10 wt% of the functionalized SNPs reduced the quasi-static surface tension to approximately 53 mN/m, regardless of the amount of reacted mPEG silane. However, the quantification of mPEG silane influenced …

Hydrodynamics Of Drops And Particles Driven By Marangoni And Diffusiophoretic Forces, Subramaniam Chembai Ganesh

Dissertations and Theses

This study investigates the hydrodynamics of particles and drops driven by forces generated by an asymmetrical physical and chemical surrounding environment. In the first part, a novel colloidal motor design driven by surface tension forces is proposed, utilizing an active Janus particle encapsulated in an immiscible liquid drop to form a compound drop/particle. Marangoni forces induced by asymmetric solute adsorption at the liquid-liquid interface of the drop propels the compound system. The propulsion speeds of the motor are analyzed for various relative sizes and configurations of the Janus particle and the encapsulating drop and the effects of varying the transport …

Hyperspectral And Polarimetric Imaging Of The Ocean For The Characterization Of The Surface Effects And Measurement Uncertainties, Mateusz Malinowski

Dissertations and Theses

Ocean and coastal waters are monitored by Ocean Color satellite sensors to determine concentrations of chlorophyll and water properties and identify areas of algal blooms and other events. The light radiance from the ocean is weak in comparison with the sky radiance, which requires very accurate atmospheric correction of the radiance measured at the top of the atmosphere (TOA) on the satellite and heavy validation of the derived water leaving radiance by field measurements from the ships and ocean platforms. For TOA and especially above water radiance the skylight reflected from the ocean surface represents one of the main sources …

Therapist Engagement With Patient Nonverbal Behavior: Exploring These Interactions As A Mechanism Of Change In Virtual And In-Person Short-Term Psychotherapy, Elliana Sheriwn

Dissertations and Theses

The individual (intrapsychic) and dyadic (interpersonal) implications of nonverbal behavior have kindled interest among psychologists for decades. Many researchers and clinicians have studied nonverbal communication in the context of attachment and moment-to-moment interactions between parent and infant (Stern, 1977; Beebe et al., 2000). Theorists have also explored nonverbal behavior in the clinical setting as a dynamic relational dimension co-created by patient and therapist (Freedman and Lavendar, 1995). Although the extant literature highlights how nonverbal communication can inform psychotherapy outcome (e.g., by fostering empathy and building rapport), the topic of therapist engagement with patient nonverbal behavior—specifically, how these interactions serve as …

Re-Envisioning Electric Railway Power Systems In Dense Urban Regions, Rohama Ahmad

Dissertations and Theses

Grid decarbonization and modernization are key requisites to combat global warming. Decarbonization entails the deployment of renewable energy sources, improving the energy efficiency of major consumers, and the electrification of the transportation and building sectors. Various US states and cities have pledged to reduce greenhouse gas (GHG) emissions (e.g., the Climate Leadership and Community Protection Act (CLCPA) in New York aims to reduce emissions to 40% below 1990 levels by 2030 and then to 85% below 1990 levels by 2050) via a set of targets in terms of renewable energy, energy storage system (ESS) capacity, and the number of electric …

Actuator Optimization And Control Of Pediatric Knee Exoskeleton For Community-Based Mobility Assistance: More Lightweight, More Affordable, And More Stable, Sainan Zhang

Dissertations and Theses

Lightweight and smart exoskeletons offer the potential to improve mobility in children. State-of-the-art pediatric exoskeletons are typically clinic-based since they are either tethered or portable but cumbersome, and their design is often not optimized across a range of environments and users. Child growth progressively alters key exoskeleton design requirements, yet no prior work investigated actuator optimization to accommodate child growth. Moreover, exoskeletons typically use the torque sensor or spring mechanics as exteroceptive feedback, but these torque sensing methods not only lead to extra cost and mass but also cause a small range of stable controller gains.

To facilitate pediatric exoskeleton …

Molecular Origins Of Phase Stability In Phase-Change Nano-Emulsions For Thermal Energy Storage By Nmr Spectroscopy, Jungeun Park

Dissertations and Theses

Phase change materials (PCMs) are latent heat storage materials that can store or release thermal energy during phase transitions. Organic PCM nano-emulsions are formed by emulsifying oil in water in the presence of surfactants, enhancing thermal conductivity and pumpability. However, PCMs nano-emulsions can become unstable due to repeated thermal cycling and shear in heat transfer systems.

To better understand the molecular origins of phase instability in PCMs nano-emulsions, liquid-state nuclear magnetic resonance (NMR) measurements were applied to a model PCM nano-emulsion. Quantitative ¹H single-pulse NMR measurements established the liquid fraction of oil within nano-emulsions as a function of temperature, …

Mechanisms For Regenerative Intervertebral Disc Healing During Early Growth In Mice, Danielle N. D'Erminio

Dissertations and Theses

Annulus Fibrosus (AF) defects of intervertebral discs (IVDs) cause painful disability, for example when herniated tissue compresses against adjacent nerves. Discectomy, the current standard of treatment to address herniation, does not repair AF defects and can result in re-herniation and recurrent pain. As such there is a need for improved AF repair strategies. It has previously been established that neonatal mice functionally regenerate following severe AF injury providing a model of successful innate AF repair processes that contrasts the poor healing of adult mice. This dissertation focuses on identifying mechanisms of AF regenerative healing in neonatal mice subjected to severe …

Enforcement Through Voluntary Participation: The Impact Of Non-Binding Informal Groups On The International Nuclear Nonproliferation Regime, Claudia M. V. Hampton

Dissertations and Theses

The present thesis analyzes the policy impact of the informal group known as the Nuclear Suppliers Group (NSG), a non treaty-bound grouping of states organized to define mutually agreed upon nuclear export controls with the aim of advancing the nonproliferation of nuclear weapons, in line with the values of the Treaty on the Non-Proliferation of Nuclear Weapons (NPT). As informal groups or voluntary forms of interstate cooperation are often criticized for their lack of enforcement mechanisms, two case studies in this thesis review the implementation of amendments and changes in national laws for states participating in the NSG (The United …

Understand The Structure-Water-Responsive Relationship By Engineering Silk Materials, Yeojin Jung

Dissertations and Theses

Water-responsive (WR) materials mechanically swell and shrink in response to changes in relative humidity, and they have demonstrated the capability to exert higher actuation energy than conventional actuators and artificial muscles. As a result, WR materials have recently gained attention as potential high-energy actuating components for engineering applications. Despite the growing interest in this emerging category of WR materials, the fundamental WR mechanism of their significant performance is still not fully understood, limiting the ability to rationally design engineered systems. This dissertation presents three approaches for understanding the water-responsiveness of materials by engineering Bombyx (B.) mori silkworm silk protein. First, …

Reporting On Un Security Council: Decoding Media Bias, Alessandra Loiero

Dissertations and Theses

This thesis explores Western media's representation of the United Nations (UN), focusing on the Security Council's role in global conflict resolution. It examines how UN-accredited correspondents perceive the effectiveness of the Security Council, particularly when the body faces deadlock. The study employs text analysis techniques to identify biases and perceptions in media coverage, using The New York Times' reporting on the Ukraine conflict as a case study. It illuminates framing effects in journalistic narratives, revealing how journalists subtly interject their views when reporting, often revealing unrealistic expectations and shedding light on the limitations of the UN's mandate or its inability …

Explaining The U.S Failure In Afghanistan, Edwar Ramirez

Dissertations and Theses

This thesis offers a comprehensive analysis of the trajectory of U.S. foreign policy in Afghanistan spanning multiple administrations from Obama to Biden, contextualizing it within broader shifts in American interventionism since the Cold War. An examination of the Obama, Trump, and Biden eras, delineates the complexities of military interventions, nation-building endeavors, the limitations of incrementalism in addressing the multifaceted challenges of conflict resolution, and the challenges of maintaining stability in conflict regions while avoiding prolonged military engagements. Ultimately, it advocates for a comprehensive and more flexible approach to foreign policy, balancing idealistic aspirations with pragmatic considerations to safeguard national interests, …

Brics Currency And Dollar Hegemony: Passing Of The Torch?, Sami Tomaihi

Dissertations and Theses

The dawn of the 21st century has brought with it tremendous uncertainty with regard to the nature of global dominance. As doubts concerning the United States’ viability as a hegemon emerge, questions about how new powers may come to prominence circle (Rapayane, 2020). The BRICS bloc -- consisting of Brazil, Russia, India, China, and South Africa, respectively -- is a collection of regional powers in the developing world that have engaged in a series of high-profile collaborations together in the ostensible interest of increasing global advocacy within the developing world (Kubayi, 2022). One radical means that has been proposed within …

Parasympathethic Nervous Activity And Social Exclusion In Borderline Personality Disorder, Rebecca E. Barnes

Dissertations and Theses

Abstract

The experience of being excluded is universally unpleasant. However, for individuals that suffer from Borderline Personality Disorder (BPD), the experience of social exclusion, or ostracism can be unbearable (Bortolla, et al., 2019). While there is a significant amount of research on physiological reactivity in BPD, no studies adequately connect the parasympathetic nervous system (PNS) responses of people with BPD to social exclusion which is critical to understand as the inability of the PNS of individuals with BPD to adapt to stressors may be a contributing factor to the elevated rate of suicide and suicide attempts in this clinical population …

Depression In African American Males And The Mental Health Stigma, Deanna Carrington

Dissertations and Theses

Depression is a common mental health disorder in the United States. In particular, African Americans have a greater risk of depression because they are predisposed to depressive symptoms as opposed to their White counterparts (Miller and Taylor, 2011). Moreover, African Americans are 20% more likely to experience psychological distress that leads to depression compared to other racial groups. While African American cultural norms focus on resilience and independence, discussion around mental health is discouraged, which leads to underreporting and delayed treatment. For males in the African American community, they can be hesitant to seek help, let alone discuss their experiences …

Social Determinants Of Psychosis: An Examination Of Loneliness, Stress, Discrimination, And Neighborhood Cohesion In Psychotic Disorders, Alexandria Selloni

Dissertations and Theses

This study examined social determinants in individuals diagnosed with psychotic disorders in a large, diverse, sample from the NIH-sponsored All of Us Research Program. Participants completed self-report measures of loneliness, perceived stress, everyday discrimination, and neighborhood social cohesion. Analyses showed that individuals with a diagnosis of a psychotic disorder experience significantly more feelings of loneliness, stress, everyday discrimination, and poorer neighborhood social cohesion compared to individuals without any diagnosis of a mental disorder as well as compared to individuals who may have other mental disorders other than psychosis. We further examined racial difference among individuals with psychotic disorders and found …

Exploring Spatial Operations Of Distractor Suppression In The Sense Of Touch, Nicole A. Serino

Dissertations and Theses

The ability to select sensory information in our environment is key to facilitating goal-directed actions. Sensory selection mechanisms are prevalent in all sensory modalities, and can be implemented by enhancing information at the relevant location and/or suppressing neural information outside the focus of attention (a mechanism known as distractor suppression). Although we have a decent understanding of how the brain enhances information within the focus of attention, less is known about the mechanisms that mediate suppression of distractors, especially in sensory modalities outside vision. In this study, we conducted a series of behavioral experiments to investigate the spatial flexibility of …

The Menstrual Cycle In Psychotherapy: Interventions, Therapist Engagement, And Blind Spots, Rozita Alaluf

Dissertations and Theses

There is a dearth of literature on psychotherapy and menstruation, except for the treatment and diagnosis of issues associated with premenstrual distress. This study aimed to bridge this gap by investigating the frequency and context of discussions about the menstrual cycle, the factors influencing therapists’ engagement with this topic, and the therapeutic approaches utilized to address the menstrual cycle within psychotherapy.

In phase 1, 118 psychotherapists from various theoretical backgrounds completed a survey on menstruation in clinical practice. The data was analyzed using descriptive statistics. In phase 2, semi-structured interviews were conducted with 7 psychotherapists, primarily identifying their theoretical orientation …

Motherhood In Crisis: A Qualitative Study Of First-Time Mothers Diagnosed With Breast Cancer, Tamzin M. Baker

Dissertations and Theses

The aim of this study is to explore the psychological impact of pregnancy-associated breast cancer (PABC) on a first-time mother’s identity. What effects does life-threatening illness have on the development of maternal identity and connection? This question was explored with a sample of six mothers via semi-structured interview and self-report measure with the aim to shed light on a scarcely studied phenomenon that is predicted to affect a greater number of mothers in the future. These research questions were explored through Interpretive Phenomenological Analysis (IPA) (Smith et al., 2009) resulting in group experiential themes and three theoretical constructs: (1) a …

Teach Them How To Say Goodbye: Student Therapist Termination At A Psychodynamic Training Clinic, Michael Ferrara

Dissertations and Theses

Termination is arguably one of the most important aspects of psychotherapy, however, the research into training for termination is sparse. Further, student therapists report that their training for termination provided little guidance, instruction, or acknowledgment of clinical realities around treatment endings. Using a semi-structured interview with a sample of 11 student therapists at a psychodynamic training clinic, this study explored experiences of termination and the preparation for those endings. Qualitative thematic analysis indicated that this group of student therapists did not experience shared and structured termination training but did not feel they were unprepared for the endings with their patients. …

The Shadow Of Grief: Understanding Grief Among Ethnoracially Diverse Young Adults, Rona R. Tarazi

Dissertations and Theses

Background: Complicated grief, characterized by prolonged and intense mourning, presents unique challenges for individuals grappling with loss, as it is shaped by a multitude of factors influencing the grieving and mourning processes. While the literature has identified several factors that significantly impact complicated grief, such as post-loss symptom severity, stigmatization, the quality of the relationship to the deceased, and grief-related avoidance, this two-part study aimed to expand on existing findings by shedding light on the landscape of grief among a sample of ethnoracially diverse young adults. Part 1 of the study examined whether previously identified factors remain significant in this …

Identity-Focused Therapist Self-Disclosure In Matched Sexual/Gender Minority Dyads: A Longitudinal Therapy Process-Outcome Study, Brian Thomas Neff

Dissertations and Theses

Therapist self-disclosure (TSD) is a controversial clinical intervention whose benefits and drawbacks remain contested. Notably, no prior research has differentiated explicitly between self-disclosures related to the therapist’s core identities and those peripheral to identity, and qualitative studies suggest that identity-focused therapist self-disclosure (TSD-I) may be beneficial when therapist and patient share at least one marginalized identity. LGBTQ+ people, who experience significant health disparities and utilize psychotherapy more than their heterosexual and cisgender counterparts, could benefit particularly from TSD-I. The mental and physical health challenges facing LGBTQ+ individuals are predominantly explained through minority stress theory, which suggests that societal prejudice and …