Gels are three-dimensional polymer networks capable of absorbing a large amount of solvent molecules subject to various external stimuli (pH, temperature, light, etc.). They exhibit a rich mechanical behavior and prominent nonlinearity owing to their high flexibility, stimuli-responsiveness and superabsorbency. More compelling are the intriguing morphologies and novel functionalities achieved...
Porous metal structures exhibit numerous advantages over dense materials due to their high specific stiffness, strength, damping, energy absorption, and surface areas, making them suitable for applications ranging from actuators to medical implants. However, traditional foam manufacturing methods do not provide sufficient control of the foam micro-architectures, and the creation...
This dissertation investigates a single-column model for Arctic energy balance in the limit as a smoothing parameter associated with ice-albedo feedback tends to zero. This limit is a common modeling approximation used in conceptual climate models, and we explore the implications of taking this limit on bifurcations associated with the...
The reforms called for by the Next Generation Science Standards (NGSS) (National Research Council, 2012; NGSS Lead States, 2013) involve students using scientific and engineering practices to construct disciplinary knowledge with others. For this work to be meaningful, students need to understand what they were doing and how their actions...
Unveiling Baubo” describes how the mythical figure Baubo was constructed in nineteenth-century German. Associated with the act of exposing herself to the goddess Demeter, Baubo came to epitomize questions about concealment and unveiling in the budding fields of archaeology, philology, psychoanalysis and literary theory. As I show in my dissertation,...
Agents of online platforms often have to make purchase decisions in the face the uncertainty of the true value of an item. Observing the other agents’ actions and/or reviews is one common method to learn about an item. However such observational learning can lead to an information cascade, in which...
Following a stroke, precise, individuated control of single joints is often replaced by highly stereotyped patterns of multi-joint movement, due to a loss of independent joint control, which can negatively impact functional use of the paretic arm. Despite the debilitating nature of this impairment, the precise underlying neural mechanisms remain...
In recent decades, scholars and activists have written extensively on the immense growth of America’s penal system, its origins in fear-based, racially coded politics and neoliberal reformations, its distressingly ineffective and unjust outcomes, and its central place as a social institution in the contemporary United States. Yet this dominant discourse...
This dissertation consists of two papers united by a common element: they both study the behavior of heterogeneous agents across the business cycle.
In Chapter 1, I consider: what is the link between the drop in consumer credit during the Great Recession and increased unemployment? I build a heterogeneous household...
The purpose of the egg is to give rise to offspring in sexually reproducing organisms. Zinc thresholds became connected to egg quality from initial breakthrough discoveries in M. musculus which demonstrated that large-scale zinc fluxes occur during meiotic maturation, and these fluxes are required to maintain female egg viability. Numerous...
This dissertation narrates the circulation and institutionalization of an emergent category of talk performance within the late-twentieth century US avant-garde through the career trajectories of three artists from disparate disciplinary backgrounds working in and around the 1970s: theatrical monologist Spalding Gray, poet David Antin, and dance artist and filmmaker Yvonne...
My dissertation explores the dynamics of Northeast Asia’s island disputes, specifically the Dokdo/Takeshima dispute between Korea and Japan and the Senkaku/Diaoyu dispute between Japan and China. I focus on three questions that are important for academic and policy purposes and are not well addressed by existing theories: 1) what explains...
The rational and deliberate assembly of functional materials from nanoscale building blocks requires a fundamental understanding of interactions between individual components as well as their collective behavior. This thesis investigates the hierarchical organization of nanoparticles using DNA into well-defined three-dimensional materials on the micrometer and millimeter length scales. This assembly...
Social media such as Twitter has risen as a powerful new communication medium for disseminating information on news, personal interests, experiences, and opinions. On social media, people talk about their lifestyle, health conditions and symptoms, search information on treatment options, and connect with people who have been through similar medical...
This thesis reports on the use of optical antennas, and more broadly, metal optics for the engineered collection and enhancement of infrared photodetectors. These ideas would be useful in enhancing at other wavelengths and other types of detectors, but this work is specifically focused on the Quantum Well Infrared Photodetector...
Computational models greatly benefit metabolic engineering efforts by helping to elucidate experimental observations and predict engineering targets for improved cellular performance. Additionally, supplementing experimental efforts with computational modeling can reduce the loss of time and resources in the lab by narrowing down testing conditions. In optimal cases, computational models can...
The discovery and tailoring of new useful organic molecules for applications such as medicine and materials science is highly driven by meaningful developments in chemical methodology, and some of the most impactful advances have invoked catalysis to increase efficiency and specificity. N-heterocyclic carbenes (NHCs) have continuously occupied a prominent space...
The thesis contains all four chapters of my Ph.D. research on deep learning and text mining. The first chapter, "Temporal Topic Analysis with Endogenous and Exogenous Processes'', proposes a topic model which mines temporal economy-related documents with an exogenous economic indicator, and finds the relationship between document topics and the...
Related article: McGrath, M.C., Gerber, A.S. Experimental evidence for a pure collaboration effect. Nat Hum Behav 3, 354–360 (2019) doi:10.1038/s41562-019-0530-9
Dictating Manhood: Refiguring Masculinity in Haitian Literature of Dictatorship, 1968-2010 explores the literary representations of masculinity under dictatorship. Through the works of Marie Vieux Chauvet, René Depestre, Frankétienne, Georges Castera, Kettly Mars and Dany Laferrière, my dissertation examines the effects of dictatorship on Haitian masculinity and assesses whether extreme oppression...
The diverse reactivity patterns, unique structural features imparted by the cumulated double bonds, and possibility of axial chirality have garnered allenes considerable attention in organic synthesis. Numerous methods have been described in the literature to afford optically active allenes starting from chiral starting materials, yet catalytic and asymmetric methods to...
Mucolipins are lysosomal cation channels, with high permeability to calcium ions, that are thought to regulate endolysosomal trafficking. While mucolipin 1 is expressed in all cells, mucolipin 3 is expressed in a small subset of cells (i.e. neonatal intestinal enterocytes, cochlear hair cells and marginal cells of stria vascularis). This...
Transcription by RNA polymerase II (Pol II) in metazoans is regulated in multiple steps, including preinitiation complex (PIC) formation, initiation, Pol II escape, productive elongation, cotranscriptional RNA processing, and termination. Genome-wide studies have demonstrated that the phenomenon of promoter-bound Pol II pausing is widespread, especially for genes that respond to...
Lithium ion batteries (LIBs) have been the most prominent electrochemical energy storage technology over the past decades and enabled the wireless evolution of portable electronic devices. Yet the expanded use of renewable but intermittent energy sources coupled with increasing demand for electric transportation vehicles put forward requirements to electrochemical energy...
Two-dimensional materials’ “all-surface” architecture presents a new paradigm for investigations into electron confinement effects and surface phenomena. However, synthesizing, characterizing, and ultimately engineering the properties of 2D materials represents a formidable challenge. This thesis presents several cases of isolating novel 2D materials via vapor-based syntheses. Vapor-based syntheses allow for reproducible...
A central question in neuroscience is how the brain plans movements. Here, I apply neural data analysis and machine learning methods to better understand both eye and arm movement planning, in particular focusing on naturalistic settings. First, I built encoding models to investigate the factors that led to neural activity...
Between 1815 and 1830, the western Atlantic experienced a surge in maritime piracy. The United States was confronted with the ancient specter of hostis humani generis, the enemy of all, which threatened the safety and prosperity of the young maritime nation. Questions emerged: Who was responsible for policing international waters?...
Computational catalysis is a challenging discipline because of the complexity of catalytic particles and the large number of reaction pathways that may occur in a given reaction. This thesis addresses these challenges with two strategies. First, an appropriate molecular model is defined that captures adequate physical and chemical details while...
Up to two thirds of individuals with chronic hemiparetic stroke suffer life-long residual impairments to their paretic hands, affecting their independence and quality of life. These impairments stem initially from losses of direct corticospinal projections that result in an increased reliance on indirect bulbospinal pathways. This reliance on the indirect...
The symbiotic relationships between ectomycorrhizal fungi (EcM) and host plants are vital for the survival and diversification of each group. Here we introduce the Suillus / Pinaceae model system to address evolutionary relationships between EcM fungi and host plants. Genus Suillus has higher host specificity than other groups of EcM...
The goal of this thesis is to develop practical algorithms with sound theoretical properties for three different subfields of nonlinear optimization: (i) Optimization Algorithms for Supervised Machine Learning; (ii) Derivative-Free Optimization; and (iii) Distributed Optimization. As such, the thesis is divided into three main chapters.
The focus of Chapter 2...
Unstructured data like text is plentiful and possibly contains valuable insights leading to a better decision-making process. Manually obtaining these insights can be costly and time-consuming. Text mining, also known as Text analytics, is developed to derive meaningful information from textual data. It is widely applied in various domains such...
My dissertation takes as its point of departure the commonly held premise that WWI forever changed the horizon of French literary production. While deemed indescribable, many authors did attempt to represent the battlefields and aftermath of WWI in literature. Distinct from previous heroic accounts of war, these descriptions had to...
The isolation of graphene by the simple Scotch-tape method led to the discovery of many novel two-dimensional (2D) materials. Since then, many new material growth and characterization techniques were proposed and many new phenomena were observed in layered 2D materials. Black phosphorous (BP) and topological insulator(TI) \ce{Bi2Se3} are examples of...
Plasmonic nanocavities consisting of metal nanoparticle (NP) arrays support surface lattice resonances (SLR) or lattice plasmon, emerged as an exciting platform for manipulating light-matter interactions at the nanoscale. Their recent prominence can be attributed to a combination of desirable photonic and plasmonic characteristics: high electromagnetic field enhancements extended over large...
Both the timing (i.e., ‘when’) and amount (i.e., ‘how much’) of language exposure have been shown to affect language-learning outcomes. Monolinguals and (most) bilinguals confound these two factors of early exposure and extended exposure (i.e., their first-acquired language is their most used or dominant language), making it difficult to isolate...
Ecological restoration is a land management tool for biological conservation in areas where ecosystems are subject to a suite of natural and anthropogenic disturbances. This approach is particularly critical in urban areas where disturbances are often frequent and substantial. Restoration projects aim to re-establish an entire ecosystem, including the native...
Plasmonic nanostructures are capable of trapping and confining light at the nanoscale, leading to interesting optical phenomena involving enhanced light-matter interactions. These responses arise in two forms: surface plasmon polaritons propagating on the surface of metal films and localized surface plasmons confined to the surface of metal nanoparticles. Plasmonic modes...
The ongoing generational shift whereby millennials are overtaking baby boomers as the largest generation in the U.S. population, along with the technology-fueled evolution of transportation patterns, offer opportunities for policy makers to leverage changing behavior and build a more sustainable future. Much research has emerged seeking to understand whether the...
In May 2018, the US Food and Drug Administration approved daily oral pre-exposure prophylaxis (PrEP) for adolescents under age 18. Although this is an important step toward HIV prevention for adolescents assigned male at birth who have sex with males (AMSM), limited research exists to gauge their awareness of PrEP...
Background: Evidence supporting a bidirectional relationship between depression and recurrent cardiovascular disease (CVD) appears strong, but there remains a need to better characterize the role of depression in CVD risk and cardiovascular health (CVH) promotion, especially in the context of comorbid risk factors such as cigarette smoking. In the present...