Graduate Theses & Dissertations


Supercritical Water Chemistry
Supercritical water (SCW) exhibits unique properties that differentiates it from its low temperature behaviour. Hydrogen bonding is dramatically reduced, there is no phase boundary between liquid and gaseous states, heat capacity increases, and there is a drastic reduction of the dielectric constant. Efforts are underway for researchers to harness these properties in the applications of power generation and hazardous waste destruction. However, the extreme environment created by the high temperatures, pressures and oxidizing capabilities pose unique challenges in terms of corrosion not present in subcritical water systems. Molecular Dynamics (MD) simulations have been used to obtain mass transport, hydration numbers and the influence on water structure of molecular oxygen, chloride, ammonia and iron (II) cations in corrosion crevices in an iron (II) hydroxide passivation layer. Solvation regimes marking the transitions of solvation based versus charge meditated processes were explored by locating the percolation thresholds of both physically and hydrogen bonded water clusters. A SCW flow through reactor was used to study hydrogen evolution rates over metal oxide surfaces, metal release rates and the kinetics for the oxidation of hydrogen gas by oxygen in SCW. Insights into corrosion phenomena are provided from the MD results as well as the experimental determination of flow reactor water and hydrogen chemistry. Author Keywords: Flow Studies, Molecular Dynamics, Supercritical Water
Altered Hippocampal Regulation of Immediate Early Genes after Pentylenetetrazol-Induced Seizures
Seizures induce long-term changes in gene expression in the hippocampus. Experimental evidence has demonstrated a significant effect of epileptic activity on the activity of neurons that participate in complex cognitive and behavioural processes. The present series of experiments involving kindling with subconvulsive doses of PTZ demonstrates a link between seizures and altered immediate early gene expression within the hippocampus and dentate gyrus. In addition, newborn hippocampal neurons were shown to have decreased induction of plasticity-related genes, suggesting deficits in activity-dependent recruitment. These findings may shed light on the mechanisms underlying epileptogenesis and epilepsy-related hippocampal dysfunction in human patients. Author Keywords: hippocampus, IEGs, kindling, neurogenesis, seizures
Assessing Molecular and Ecological Differentiation in Wild Carnivores
Wild populations are notoriously difficult to study due to confounding stochastic variables. This thesis tackles two components of investigating wild populations. The first examines the use of niche modeling to quantify macro-scale predator-prey relationships in canid populations across eastern North America, while the second examines range-wide molecular structure in Canada lynx. The goal of the first chapter is to quantify niche characteristics in a Canis hybrid zone of C. lupus, C. lycaon, and C. latrans to better understand the ecological differentiation of these species, and to assess the impacts of incorporating biotic interactions into species distribution models. The goal of the second chapter is to determine if DNA methylation, an epigenetic marker that modifies the structure of DNA, can be used to differentiate populations, and might be a signature of local adaptation. Our results indicated that canids across the hybrid zone in eastern North America exhibit low levels of genetic and ecological differentiation, and that the importance of biotic interactions are largely lost at large spatial scales. We also identified cryptic structure in methylation patterns in Canada lynx populations, which suggest signatures of local adaptation, and indicate the utility of DNA methylation as a marker for investigating adaptive divergence. Author Keywords: Ecological Epigenetics, Ecological Genetics, SDM
All Things Fusible
This dissertation presents the work of the American science fiction writer Neal Stephenson as a case study of mediations between literature and science by mobilizing its resonances with contemporary science studies and media theory. Tracing the historical and thematic trajectory of his consecutively published novels Snow Crash (1992), The Diamond Age; or, A Young Lady’s Illustrated Primer (1995), Cryptonomicon (1999), Quicksilver: The Baroque Cycle I (2003), The Confusion: The Baroque Cycle II (2004), and The System of the World: The Baroque Cycle III (2004), it approaches Stephenson’s fiction as an archaeology of the deep history of science that leads from late twentieth-century cyberculture, to world-war-two cryptography, and the seventeenth-century rise of the Royal Society. Refracted through a parallel reading of Stephenson’s novels and the theoretical work of Michel Serres, Bruno Latour, Friedrich A. Kittler, Isabelle Stengers, Donna Haraway, and others, this dissertation offers a literary discussion of the relations among cybernetics, complexity theory, information theory, systems theory, Leibnizian metaphysics, and Newtonian alchemy. Recognizing these hybrid fields as central to contemporary dialogues between the natural sciences and the humanities, Stephenson’s work is shown to exhibit a consistent engagement with the feedback loops among physical, artistic, narratological, and epistemological processes of innovation and emergence. Through his portrayal of hackers, mathematicians, natural philosophers, alchemists, vagabonds, and couriers as permutations of trickster figures, this dissertation advances a generalized notion of boundary transgressions and media infrastructures to illustrate how newness emerges by way of the turbulent con-fusion of disciplines, genres, knowledge systems, historical linearities, and physical environments. Uninterested in rigid genre boundaries, Stephenson’s novels are explored through the links among artistic modes that range from cyberpunk, to hard science fiction, historiographic metafiction, the carnivalesque, and the baroque. In a metabolization of the work performed by science studies, Stephenson’s fiction foregrounds that scientific practice is always intimately entangled in narrative, politics, metaphor, myth, and the circulation of a multiplicity of human and nonhuman agents. As the first sustained analysis of this segment of Stephenson’s work, this dissertation offers a contribution to both science fiction studies and the wider field of literature and science. Author Keywords: Complexity Theory, Cyberpunk, Michel Serres, Neal Stephenson, Science Fiction, Science Studies
Sextual Consent
The purpose of the current study was to explore the relationships between sexting, perceptions of sexual consent, and nonconsensual sexual experiences (NSEs). Participants consisted of 100 community members and 851 undergraduate students enrolled at Trent University. It was found that males were more likely than females to interpret ambiguous sexual scenarios as consensual, but consent perceptions were not influenced by sexting. When examining past personal experiences, males interpreted received sext messages as an indicator of consent significantly more than females, while females were more likely to interpret received messages as more harassing. NSEs were significantly related to sexting behaviours: those who engage in sexting were more likely to also have experienced a NSE, and 20.5% of participants in the current study reported having experienced a NSE with a consensual sexting partner. The current study has important implications for the future of sexting research, practice, and policy. Author Keywords: nonconsensual sexual experiences, sexting, sexual assault, sexual consent, sexual harassment
Reconceptualising the Heteronormative Curriculum Through Autobiographical Methodology - A Study of Heteronormativity within Ontario Ministry of Education Curriculum Documents
This thesis is about the negative impacts on queer identities caused by the lack of diversity related to sexual orientation within Ontario Ministry of Education curriculum documents, both at the elementary and secondary level. Curriculum documents as well as policy documents are analysed and compared in order to address the lack of diverse sexual orientation representation within Ontario’s education system. The study is guided by the question: “who benefits from the current representations of sexual orientation in the curriculum?” This conceptual study advances autobiographical methodology and the concept of Currere in relation to queer theory that allows researchers to analyse their educational experiences throughout the course of their lives and then become agents of social change. The results of my personal curriculum analysis have shown that curriculum documents lack diverse sexual orientation representation and that this has negative impacts how LGBQQ people identify and on the course of their lives. Author Keywords: Curriculum, Homophobia, LGBQQ, Ontario Curriculum, Ontario Education, Sexual Orientation
Eco-evolutionary Dynamics in a Commercially Exploited Freshwater Fishery
Fisheries assessment and management approaches have historically focused on individual species over relatively short timeframes. These approaches are being improved upon by considering the potential effects of both broader ecological and evolutionary processes. However, only recently has the question been raised of how ecological and evolutionary processes might interact to further influence fisheries yield and sustainability. My dissertation addresses this gap in our knowledge by investigating the role of eco-evolutionary dynamics in a commercially important lake whitefish fishery in the Laurentian Great Lakes, a system that has undergone substantial ecosystem change. First, I link the timing of large-scale ecological change associated with a species invasion with shifts in key density-dependent relationships that likely reflect declines in the population carrying capacity using a model selection approach. Then, using an individual-based model developed for lake whitefish in the southern main basin of Lake Huron, I demonstrate how ecosystem changes that lower growth and recruitment potential are predicted to reduce population productivity and sustainable harvest rates through demographic and plastic mechanisms. By further incorporating an evolutionary component within an eco-genetic model, I show that ecological conditions also affect evolutionary responses in maturation to harvest by altering selective pressures. Finally, using the same eco-genetic model, I provide a much-needed validation of the robustness of the probabilistic maturation reaction norm (PMRN) approach, an approach that is widely used to assess maturation and infer its evolution, to ecological and evolutionary processes experienced by exploited stocks in the wild. These findings together highlight the important role that ecological conditions play, not only in determining fishery yield and sustainability, but also in shaping evolutionary responses to harvest. Future studies evaluating the relative effects of ecological and evolutionary change and how these processes interact in harvested populations, especially with respect to freshwater versus marine ecosystems, could be especially valuable. Author Keywords: Coregonus clupeaformis, density-dependent growth, fisheries-induced evolution, individual-based eco-genetic model, Lake Huron, stock-recruitment
Tourism Around Yellowknife
Yellowknife, which began as a gold-mining town in the 1930s, developed into a modern city and the territorial capital. Yellowknife is a popular destination for tourism with yearly growing numbers that reflect aurora viewers, business travel, general touring and visiting friends and relatives. Consequently, tourism in the Yellowknife area is increasing in volume and is of growing economic significance. Municipal and territorial governments actively advance its expansion, with the City’s 2015-2019 Tourism Strategy directed at infrastructure and service enhancement. While diamond tourism, as envisioned in 2004, did not progress, the Indigenous population in the territory is developing and executing community-based tourism plans. Utilizing Grounded Theory, this study demonstrates that governmental and stakeholder support proves dedication and commitment to the local tourism industry for years into the future. Yellowknife and its citizens take firm measures to attract increasing numbers of visitors in recognition of the value of tourism to their community. Author Keywords: Aurora borealis, Diamond industry, Government involvement, Northwest Territories economy, Tourism, Yellowknife
Habitat Characteristics, Density Patterns and Environmental Niches of Indo-Pacific Humpback Dolphins (Sousa chinensis) of the Pearl River Estuary and Eastern Taiwan Strait
The purpose of this thesis is to quantify the habitat characteristics, density patterns and environmental niches of two groups of Indo-Pacific humpback dolphins: Chinese white dolphins (CWD) of the Pearl River estuary (PRE), and Taiwanese white dolphins (TWD, =Taiwanese humpback dolphin, THD) found in the eastern Taiwan Strait (ETS). Much work has already been done on the habitat use of CWDs in parts of the PRE, so the purpose of my first two chapters was to advance knowledge of the TWD to a comparable level. Chapter 2 contains the first published description of the relatively shallow, inshore, estuarine habitat of the TWD. General environmental characteristics and observed group sizes were consistent with other populations of humpback dolphins, and group sizes were not correlated with the environmental variables measured during surveys. Chapter 3 investigated density patterns of TWDs, finding spatiotemporal heterogeneity across the study area. Humpback dolphin densities fluctuated from year to year, but some parts of the study area were consistently used more than others. Environmental characteristics again did not influence dolphin densities, though more dolphins than expected were sighted in waters adjacent to major land reclamations, which may be related to the location of these areas close to major rivers. In Chapter 4, niches of the TWD and CWDs found in the PRE were compared using species distribution models, which indicated significant niche overlap. This may be due to niche conservatism maintaining similar fundamental niches between the two groups since their historical split >10,000 years ago, or a result of the intrinsic biotic factors that influence occurrence data affecting the hypervolume dimensions of each realized niche in similar ways. Geographic predictions indicate that most of the TWD’s range has likely been surveyed, and that there may be connectivity between PRE humpback dolphins and at least one neighbouring putative population due to continuous predicted suitable habitat in waters that remain poorly surveyed. Overall, my thesis demonstrates that density patterns may vary over time, but on a broad temporal scale, these two allopatric groups of Indo-Pacific humpback dolphins have similar habitat requirements in geographically isolated, but environmentally similar locations. Author Keywords: density, habitat, Indo-Pacific humpback dolphin, niche overlap, Sousa chinensis, species distribution model
Psychometric Properties of a Scale Developed from a Three-Factor Model of Social Competency
While existing models of emotional intelligence (EI) generally recognize the importance of social competencies (SC), there is a tendency in the literature to narrow the focus to competencies that pertain to the self. Given the experiential and perceptual differences between self- vs. other-oriented emotional abilities, this is an important limitation of existing EI models and assessment tools. This thesis explores the psychometric properties of a multidimensional model for SC. Chapter 1 describes the evolution of work on SCs in modern psychology and describes the multidimensional model of SC under review. Chapter 2 replicates this model across a variety of samples and explores the model’s construct validity via basic personality and EI constructs. Chapter 3 further explores the predictive validity of the SC measure within a group of project managers and several success and wellness variables. Chapter 4 examines potential applications for the model and suggestions for further research. Author Keywords: emotional intelligence, project management, social competency, work readiness
History Majors During the Humanities Crisis
This qualitative case study explored the experience of members and associates of one university history department in order to examine the phenomena of choosing and working within the history major in the context of current declines in humanities enrolment. Drawing on interviews with 7 professors, 8 student majors, and 10 professional staff, it analyzed beliefs about how students should choose their majors, benefits of historical thinking, the current climate of crisis in history, and resources to support history students. Participants agreed that students should choose a major based on intrinsic factors and shared a common vision of the meaning and importance of historical thinking. However, participants experienced tension between these intrinsic values and extrinsic pressures regarding the humanities crisis and the efficacy of student-support resources. These results have implications for understanding pressures felt by current humanities students and for developing new resources to better support history majors. Author Keywords: case study, choice of major, historical thinking, history department, humanities crisis, student affairs
Ludic Fictions, Lucid Games
This thesis elucidates the role of play and games—the ludic—in Julio Cortázar’s novel Hopscotch (1966; translation of Rayuela, 1963) through a range of resonant theories. Literary gameplay dominates the formal, linguistic, affective, reflexive, and thematic dimensions of Hopscotch, which are analyzed through concepts borrowed from play theorist Roger Caillois, among others, and literary theorists including Mikhail Bakhtin and Wolfgang Iser, whose ludic theories of fiction begin to map the field of ludic fiction. The analysis positions Hopscotch as an exemplar of the ludic counter-tradition within the novel, a perennial tendency from Don Quixote to postmodernism and beyond. Hopscotch, like other ludic fictions, enacts a complex convergence of the ludic and the lucid. It provokes active reading over passive consumption, diminishes the hegemonic function of serious mimesis to elevate other forms of gameplay, notably chance, competition, vertigo, and enigma, to dominant positions, and ultimately demonstrates a profound affinity between play and critical consciousness. Author Keywords: Bakhtin, Cortazar, Iser, Ludic, Novel, Play


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