PhD, University of Cincinnati, 2008, Arts and Sciences : Physics

Condensation of Cooper pairs and Cooper quartets in fermionic systems with multiple internal degrees of freedom is studied. In this thesis work, I work on two major projects. On the first project I discuss Cooper pair condensation and while on the second I discuss Cooper quartet condensation. Due to the restrictions imposed by Pauli's principle, no two identical fermions can occupy a single quantum state. Therefore for electronic systems with two internal states, the maximum number of electrons that could be bound together is two. However; for a fermionic system having more than two internal states, it is possible that the bound state structure could be quite different. On my thesis I focus on systems that have four internal states. On one hand it is possible that the system will still undergo some types of pairing condensation, but there is also a possibility that the fermions will form a more complex structure where four fermions are bound together which we call a quartet. Physical systems where fermions can have four internal states include a system of spin-3/2 fermionic atoms and a two band electronic system. I look at possible two and four particle bound state structures in such systems. First I discuss pairing condensation in the system. I extend the original Cooper problem to the pairing of two quasiparticles excited out of two decoupled superconductors. I show that two quasiparticles can form a bound state but can't destabilize the underlying system. I derive the Landau Ginzberg free energy for the system and use it to describe the pairing structure that will exist under different limits of the interaction among the fermions. In the second work, I discuss quartet condensation in the system. I modify the Landau Ginzberg approach to include fluctuations in the order parameters and to allow for a quartet order parameter. We show that under the special SU(4) symmetric limit of interaction, the system has a tendency to undergo a quartet instability whi (open full item for complete abstract)

Committee: Ma Michael PhD (Committee Chair); Philip Argyres PhD (Committee Member); Young Kim PhD (Committee Member); Rostislav Serota PhD (Committee Member) Subjects: Physics

Master of Arts, The Ohio State University, 1971, Graduate School

Committee: Not Provided (Other) Subjects:

Master of Arts, The Ohio State University, 1932, Graduate School

Committee: Not Provided (Other) Subjects:

Master of Arts (MA), Bowling Green State University, 1966, Communication Studies

Committee: Raymond Yeager (Advisor) Subjects: Business Administration; Communication

Master of Arts (MA), Bowling Green State University, 1960, English

Committee: Lowell P. Leland (Advisor) Subjects: American Literature

Master of Arts (MA), Bowling Green State University, 1960, English

Committee: Lowell P. Leland (Advisor) Subjects: American Literature

Master of Science (M.S.), University of Dayton, 2021, Aerospace Engineering

As aircraft are developed to be faster and more advanced, the role of the human pilot in the combined pilot-aircraft system dynamics is important to understand. New fields of research aim to identify the ways in which adverse coupling of the pilot and aircraft dynamics manifest and potential causes of phenomena such as pilot-induced oscillations (PIO) and spatial disorientation. This research is considered too dangerous for real aircraft, and flight simulators provide a safer alternative. Therefore, there is a need for simulator models that seem realistic to pilots. I propose a methodology for developing and validating aircraft models within the motion-based Merlin 521 Flight Simulator that provide these perceptibly realistic flight dynamics. This specific flight simulator allows any aircraft to be modeled and simulated through a streamlined user interface, while providing an immersive experience for users within a typical cockpit layout. Realistic physics, clear graphics, and 6 degree-of-freedom motion enhance the physical realism of the simulator. Cessna 152 and Piper PA-28R-201 Arrow III models were developed from pilot's operating handbooks (POH) and aircraft design theory. Model validation relied on feedback from a group of 20 pilots with extensive experience flying at least one of these aircraft. Each pilot flew 8 different routine maneuvers and rated model realism with respect to the actual aircraft using the Cooper-Harper Handling Rating Scale. Simulation data, including control inputs and model kinematics, were extracted after each trial. As each model underwent testing, revisions were made to improve the realism of the model. Model performance was quantified by simulator data and used to confirm model deficiencies noticed by the test pilots. The Cessna 152 climbed at 734 fpm, which exceeded the 700 fpm given in the POH and expected by the pilots for sea level. The model was too efficient for short field takeoff, either breaking ground slower than 54 KIAS (open full item for complete abstract)

Committee: Timothy Reissman (Committee Chair); Megan Reissman (Committee Member); Sidaard Gunasekaran (Committee Member) Subjects: Aerospace Engineering

Doctor of Philosophy, The Ohio State University, 2020, English

The Postbellum, Pre-Harlem era is often overlooked in African American scholarship. My dissertation proposes a renewed investigation of this era by studying Postbellum, Pre-Harlem African American writers and their negotiation with a prominent discourse during this period: African American folklore. Since “the folk” were repeatedly equated to Black Americans and folklore was used as a measure of African Americans' post-emancipation “progress,” nineteenth century Black intellectuals, recognized nineteenth- and twentieth-century folklore as a key site in shaping Black representation. Moreover, they were “active participants” in fashioning the foundations of American folklore (Waters and Hampton 22-46; Lamothe 23-32; Moody-Turner 4, 89). Thus my dissertation explores the “sites of concern and negotiation” that Postbellum, Pre Harlem writers encountered while creating narratives that incorporated African American folklore (Moody-Turner 13); I seek to characterize and historicize the Postbellum, Pre-Harlem's “racialized regime of folk representation,” discourses that intersected to create the representation of the folk. I conduct this analysis by using a three-pronged approach that combines insights from folklore theory, narrative theory, and African American literature. I call this methodology “positioning.” Using this approach, I study how (1) African Americans were positioned as the folk in a racialized regime, (2) how African Americans (re)positioned themselves, and (3) how African Americans positioned other Black people as the folk. With this methodology, alongside a history of the social construction of “Black folk” in early African American folklore studies and nineteenth-century popular discourse, I examine Charles Chesnutt's The Marrow of Tradition, Anna Julia Cooper's A Voice from the South, Pauline Hopkins's Contending Forces, Alice Dunbar-Nelson's “The Goodness of St. Rocque,” Frances E.W. Harper's Iola Leroy, and W.E (open full item for complete abstract)

Committee: Adeleke Adeeko (Advisor); Koritha Mitchell (Committee Member); James Phelan (Committee Member); Amy Shuman (Committee Member) Subjects: African American Studies; African Americans; American Literature; Black History; Black Studies; Comparative Literature; Folklore; History; Literature

Doctor of Philosophy, The Ohio State University, 2018, Physics

The spectral intensity and phase of the complex photoionization and photorecombination dipole matrix elements of gas phase atoms and molecules were studied with subfemtosecond time resolution and sub-eV energy resolution using attosecond spectroscopy and high-harmonic spectroscopy. Using attosecond spectroscopy, the phases of two-photon transitions near autoionizing resonances were studied in Ar and He with harmonic combs of odd harmonics only as well as combs of even and odd harmonics. The Ar 3s3p64p and the He 2s2p resonances were explored using the Reconstruction of Attosecond Beating by Interference of Two-Photon Transitions (RABBITT) method and by probing omega oscillations that occur with pulse trains comprised of even and odd harmonics. The RABBITT measurements revealed that the 3s3p64p resonance produced phase excursions of ≈0.2 rad and that the 2s2p resonance exhibited phase excursions of ≈0.5 rad. These results are in excellent agreement with ab initio calculations solving the time-dependent Schrodinger equation. The RABBITT measurements also revealed a small phase structure (≈0.05 rad) in Ar, which is attributed to the tentatively-labeled 3s23p44s4p resonance. The complexity of this resonance is beyond current modeling capabilities. Comparatively, the omega-oscillation experiments revealed resonant phase excursions for the Ar 3s3p64p and He 2s2p resonances that starkly deviate from theoretical predictions using the same theoretical framework. These measurements emphasize that two-photon ionization involving electron correlations is incomplete and in need of further investigation. Using high-harmonic spectroscopy, the first measurements fully characterizing the spectral intensity and phase of the methyl chloride molecular Cooper minimum (CM) were performed. These experiments revealed that the CM of methyl chloride is located at ≈43 eV and is accompanied by a ≈-120 as group delay minimum. The key to accurately identifying this resonance was the developme (open full item for complete abstract)

Committee: Louis DiMauro (Advisor); Jay Gupta (Committee Member); Daniel Gauthier (Committee Member); Douglass Schumacher (Committee Member) Subjects: Atoms and Subatomic Particles; Molecular Physics; Physics

MDES, University of Cincinnati, 2018, Design, Architecture, Art and Planning: Design

The Cleveland Museum of Art, San Francisco MOMA, and Cooper Hewitt's new applications and interactives exemplify best-practices for museum embracement of technology. A detailed analysis of their approaches reveals how the appropriate application of technology coupled with play theory can radically change the experience and information available to the museumgoer. Providing different views, of both object and opinion, and making inaccessible archives and objects freely available can increase community outreach and visitor numbers. This thesis will look at how play, gamification, augmented reality, and social media elements can build upon these implementations and by improving the visitor experience, education and reach.

Committee: Craig Vogel M.I.D. (Committee Chair); Patrick Schreiber M.F.A (Committee Member); Renee Seward (Committee Member) Subjects: Design

MA, Kent State University, 2018, College of Arts and Sciences / Department of English

Extreme temperatures, radical weather events, and species' extinctions have all taken place or been foreshadowed during the Earth's current ecological crisis. Since this crisis was named the “Anthropocene” (new, human) epoch, scholars from a range of disciplines have sought to find both a reason for and start to this geological era. Usually, the Anthropocene is thought to have begun during the Industrial Revolution of the early nineteenth century, following the carbon dioxide that was released into the Earth's atmosphere from that period onward. However, this thesis argues that the roots of the Anthropocene, and the climate change that goes with it, can be traced back to the century before the Industrial Revolution. I argue that the roots of the Anthropocene are first apparent in Lydia Maria Child's 1824 novel, Hobomok. Set in early seventeenth-century New England, I seek to show that the Puritan settlers within the novel are carriers of what ecological philosopher Timothy Morton calls “agrilogistical” norms and subscribers to the reductive material philosophy of “Easy-Think Substances.” Moreover, I posit that the American Indians to which the Puritan settlers believe themselves superior to can be viewed as bearing material philosophies more akin to Diana Coole and Samantha Frost's new materialism and Jane Bennett's vital materialism, which offer a more ecologically sustainable viewpoint regarding nonhuman materiality. The competing viewpoints regarding nonhuman nature and materiality further serve to divide the Puritans and Amerindian characters, and this separation is seen further in ethnocentric colonialism apparent in Hobomok and furthered in James Fenimore Cooper's The Last of the Mohicans. Set a century after Hobomok, Cooper's novel serves to show the advancement of agrilogistical policies that began in Hobomok, and would continue through “civilization,” farming practices, war, and colonialization. In tracing these agrilogistical norms through the (open full item for complete abstract)

Committee: Ryan Hediger (Advisor); Wesley Raabe (Committee Member); Sara Newman (Committee Member) Subjects: American Literature; Climate Change; Ecology; Environmental Studies; Literature; Native American Studies; Native Americans; Native Studies

Doctor of Philosophy, The Ohio State University, 1976, Graduate School

Committee: Not Provided (Other) Subjects: Literature

Doctor of Philosophy, The Ohio State University, 1968, Graduate School

Committee: Not Provided (Other) Subjects: Literature

Doctor of Philosophy, The Ohio State University, 2016, English

“'I Would Prevent You from Further Violence': Women, Pirates, and the Problem of Violence in the Antebellum American Imagination" analyzes how antebellum American pirate stories used the figure of the pirate to explore the problem of violence and the role women play in opposing violent men. This project joins ongoing conversations about women in the nineteenth century in which scholars, such as Nina Baym, Mary Kelley, and Mary Ryan, have made key contributions by recovering a domestic model of nineteenth-century womanhood. As my work demonstrates, antebellum Americans were similarly invested in a more adventurous, and sometimes violent, model of womanhood that was built upon the figure of the gentleman pirate and placed in opposition to violent men. I argue that it is important to think about the pirate story and the figure of the pirate, not only in the context in which it has come to be known—escapist fantasies written for boys and young men—but as a place where authors reinforced, modified, and established different models of gender roles. Frequently within the mid-nineteenth-century American pirate story, authors answered the question of who is allowed to be violent by demonstrating that women had the capacity for violence and constructing scenarios illustrating that women were often the only ones in a position to forcibly oppose violent men. The pirate story uniquely blends different narrative conventions: adventure stories that are often believed to appeal to male audiences and domestic scenarios that are usually understood to resonate with female readers. Although historical and fictional pirates of other eras and geographical locations have been examined, little scholarship has focused on piracy in the antebellum American imagination, even though the figure of the pirate continued to proliferate, especially in popular fiction, throughout the nineteenth century. My project addresses this gap not only by demonstrating the importance of pirates in nineteenth (open full item for complete abstract)

Committee: Sara Crosby (Advisor); Andrea Williams (Committee Member); Susan Williams (Committee Member) Subjects: American History; American Literature; American Studies; British and Irish Literature; Gender; Literature; Womens Studies

Master of Science, Miami University, 2014, Physics

Andreev reflection spectroscopy can be used for estimating the spin polarization for ferromagnetic materials. We used the Circular Transfer Line Method (CTLM) to measure the Andreev reflection effect at the GaMnAs / superconductor interface and to extract GaMnAs spin polarization. In this work I will present a systematic analysis of the Andreev reflection curves for GaMnAs/Nb, using both modeling and experimental data analyses. The relationship between ballistic and diffusive transport was considered. New selective mixed transport state between ballistic and diffusive is suggested. Furthermore, we found a strong effect of short, low temperature annealing on the Andreev spectra. From we concluded that, the surface states play a major role at these compound semiconductor interfaces. Some of conductance curves showed unexpected sharp dips in the conductance. The new transport suggested state is able to explain the presence of the unexpected dips by the previous theory.

Committee: Khalid Eid PhD (Advisor); Herbert Jaeger PhD (Committee Member); Mahmud Khan PhD (Committee Member) Subjects: Nanoscience; Nanotechnology; Physics

Doctor of Philosophy, The Ohio State University, 2014, Physics

This thesis focuses on developing a standard theoretical framework to study the bulk dynamics and electromagnetic probes of ultra-relativistic heavy-ion collisions, which are presently studied experimentally at the Relativistic Heavy-Ion Collider (RHIC) and the Large Hadron Collider (LHC). We developed a modular numerical package with different (exchangeable) modular describing different evolution stages of the expanding fireball created in these collisions. For each stage of the collisions, we will give a detailed description of the theoretical model and its corresponding numerical implementation, supplemented with code checking tests. With this framework, we then perform a broad range of phenomenological studies of the bulk dynamics of relativistic heavy-ion collisions from RHIC to LHC energies. Our simulations are compared with various soft hadronic observables, in which the transverse momenta of the hadrons are less than 3 GeV/c. (This includes more than 99% of all particles created in the collision.) These comparisons help us to tightly constrain our theoretical modeling of the fireball evolution and to extract information about the transport properties of the quark-gluon plasma (QGP) as well as about the initial state fluctuation spectrum. We also explore the sensitivity of the hadronic observables to a possible temperature dependence of the QGP specific shear viscosity. The collision energy dependences of hadron spectra and elliptic flow coefficients are studied with our model, providing a qualitative baseline for comparison with recent data from the RHIC Beam Energy Scan (BES) program. Due to the smallness of the electromagnetic coupling compared to the strong interaction, electromagnetic probes in relativistic heavy-ion collisions can provide us with early dynamical evolution information complementary to that obtained from hadronic observables. The emission of direct photons from relativistic heavy-ion collisions is studied. We derive the off-equili (open full item for complete abstract)

Committee: Ulrich Heinz (Advisor); Michael Lisa (Committee Member); Robert Perry (Committee Member); Mohit Randeria (Committee Member) Subjects: Nuclear Physics; Physics; Theoretical Physics

Doctor of Philosophy in Urban Education, Cleveland State University, 2014, College of Education and Human Services

This study examines the potential mediating effects of prior knowledge regarding autism spectrum disorders and Asperger syndrome (AS), first and second-generation family ties, college major, gender, and level of exposure to Dr. Sheldon Cooper, the main character of The Big Bang Theory, on college students perceptions of a popular television character who displays traits and characteristics of Asperger syndrome/autism spectrum disorder. Bandura's (1971a) Social Learning Theory and Social Cognitive Theory (2004b) provide the framework through which the researcher attempts to understand how popular media impacts college students perceptions of autism spectrum disorders. A total of 102 college students (aged 18-40 years) from multiple colleges across the United States completed two instruments that were modified for use in this study: The Autism Spectrum Quotient (AQ; Baron-Cohen, 2001), and the Shared Activities Questionnaire (SAQ; Morgan, Walker, Bieberich, & Bell, 1996). Participants also answered demographic questions relating to age, race, major, exposure to The Big Bang Theory, and a researcher-developed knowledge of autism questionnaire. Students overwhelmingly rated Sheldon Cooper as an individual with AS. Findings from the study indicate that gender, ethnicity, income level, and exposure to The Big Bang Theory were statistically significant predictors for students’ rating of Sheldon Cooper as an individual with AS. Being a math/science/engineering major or having a second degree relationship with a person on the spectrum did not significantly predict students ratings of Sheldon as an individual with AS, nor did these variables predict students desire to engage with Sheldon in an academic, social or recreational domain. The use of Sheldon from The Big Bang Theory as an introduction to AS may be a valuable tool for working with the peers of students on the spectrum as findings suggest that repeated exposure to The Big Bang Theory reduces students cli (open full item for complete abstract)

Committee: Jeremy Genovese (Committee Chair); Hamlen Karla (Committee Member); Galletta Anne (Committee Member); Harper Brian (Committee Member); Masterson Tracy (Committee Member) Subjects: Behaviorial Sciences; Communication; Developmental Psychology; Educational Psychology; Higher Education

BM, Oberlin College, 2013, Musicology

Within the United States, few genres incite as vehement of a reaction as Country and Hip-Hop music, and both of these genres have faced a history of marginalization by the mainstream media corporations and by the broader population of the US. The reason for this marginalization often stems from the racial and class associations of the communities that produce this music, and the relationship between these genres and the broader population is well documented. What remains under-discussed is the relationship between these two communities. This study explores this relationship through an analysis of Country-Rap music, a sub-genre of Country music that is largely unrecognized by the Hip-Hop community, and which has reached mainstream radio only within the past few years. Using a semiotic-based analysis of the lyrics, music, and performance practices of Country-Rap artists, as well as the online community that consumes Country-Rap music, this study explores the ways in which the Country community is simultaneously tolerant and ignorant of the young, black, urban culture embodied by the Hip-Hop genre. Incorporating discussion of the language invoked by such an analysis, such as "genre" and "authenticity," I explore the ways in which Country-Rap music is a reflection of the race and class considerations that have plagued both communities. I ultimately aim to provoke further discussion of how our reaction to a community's music can be seen as a reflection of our opinion towards the culture and people of that same community.

Committee: Jennifer Fraser (Advisor) Subjects: Music

Doctor of Philosophy, The Ohio State University, 2011, Physics

One of the research goals in the DiMauro group is the application of attosecond light pulses for understanding electronic processes and for molecular imaging. The objective of this dissertation work was the construction of an attosecond beamline at The Ohio State University, and the implementation of the so-called Rabbitt technique. The Rabbitt experiment is a pump-probe interferometer that leads to the characterization of the temporal structure of EUV (extreme ultraviolet) and soft X ray harmonics, generated using intense infrared lasers. This allows us to find the optimal conditions for generating attosecond pulses. The attosecond pulses can then be used in the same apparatus to study the dynamics of atomic processes on the attosecond timescale and for molecular imaging. The novelty of this setup is the use of long wavelength (>1000 nm) laser beams, which will generate much shorter attosecond pulses than reported so far in literature and with a central energy that can be chosen to be much higher. One of the results of the experiment is the determination of the attochirp (i.e. the second order derivative of the harmonics' phase with respect to their frequency) scaling with the fundamental laser wavelength. The attochirp is found to have a dependence on the atomic species used to generate the harmonics. The attochirp also significantly depends on the position of the generating gas source relative to the laser focus, the pressure of the generating gas and the IR laser intensity. The influence of inner subshell electrons and the fine structure of the detection gas, secondary electrons, as well as Fano resonances in the detection gas are discussed.

Committee: Louis F. DiMauro Professor (Advisor); Linn D. Van Woerkom Professor (Committee Member); Robert J. Perry Professor (Committee Member); Jay A. Gupta Professor (Committee Member); Ulrich H. Gerlach Professor (Other) Subjects: Optics; Physics

Doctor of Philosophy (PhD), Ohio University, 2011, English (Arts and Sciences)

This project explores the central importance of captivity and revenge to four novels in the genre of frontier romance: Charles Brockden Brown's Edgar Huntly (1799), James Fenimore Cooper's Last of the Mohicans (1826), Catharine Maria Sedgwick's Hope Leslie (1827), and Robert Montgomery Bird's Nick of the Woods (1837). Although a fundamental plot aspect of nearly every work in the genre, the threat of captivity and the necessity of revenge are rarely approached as topics of inquiry, despite their deep connection to the structure and action of the texts. Perhaps most importantly, as critics Jeremy Engels and Greg Goodale note, these twin tropes serve as a way of unifying disparate social groups and creating order; in essence, such depictions function as a form of what Michel Foucault terms “governmentality,” logics of control that originate from non-governmental sources but promote systems of governance. For works in the genre of frontier romance, the cyclical recurrences of captivity and revenge violence – what I term the “captivity-revenge cycle” – become the rhetorical embodiment of the contemporary sociopolitical discourses on proper citizenship, government, and morality. With these ideas in mind, I examine the role of the captivity-revenge cycle as depicted in the texts studied here. In each novel, the centrality of forms of captivity – male domestic or economic disempowerment and isolation, female abduction and physical captivity – combine with their accompanying acts of vengeance to create a vision of frontier society that is structured around this cyclical violence; the societies depicted represent a form of participation in the era's sociopolitical discourses on topics like expansion, citizenship, proper republican morality, and justice. By reinvestigating a genre often dismissed as overly conventional and lowbrow, this project displays the way that frontier romances serve as vehicles for the rhetoric of sociopolitical organization, revealing important cultu (open full item for complete abstract)

Committee: Paul Jones PhD (Committee Chair); Nicole Reynolds PhD (Committee Member); Thomas Scanlan PhD (Committee Member); Jessica Roney PhD (Committee Member) Subjects: American Literature