Graduate Theses & Dissertations

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UV-Curable hybrid sol-gel materials
This thesis describes the synthesis, application and evaluation of a UV crosslinked 3-methacryloxypropyltrimethoxysilane-derived coating formulation. This is a two-component sol-gel system with 3-methacryloxypropyltrimethoxysilane (MaPTMS) and tetraethoxysilane (TEOS). Herein we show that if we change the co-solvent required for solubilizing MaPTMS from the more common methanol and ethanol to isopropanol we change the rate of hydrolysis from days or weeks to minutes. With the assistance of 2D 29Si-NMR we demonstrate that the system undergoes extensive condensation in twenty minutes. Using standard UV irradiation, the material can be extensively UV crosslinked with 70% of the methacryloxy functionality being consumed in 5 minutes upon irradiation in the presence of a photo-initiator. When this material is used to coat low carbon steel and immersed in an accelerated corrosion solution (dilute Harrison’s solution); this material affords low carbon steel 25 hours of protection when crosslinked and 17 hours of protection when uncrosslinked. The material was then used to encapsulate polyaniline (PANI), an intrinsic conductive polymer used in the corrosion protection of metal substrates. PANI has been encapsulated previously in sol-gel material, but due to the pH dependence of the solubility of PANI, it can not be encapsulated in more commonly chemically crosslinked sol-gel. As our system is UV crosslinked rather than chemically crosslinked, we were able to successfully demonstrate the inclusion of PANI into our coating system. Finally, this thesis includes a thorough computational investigation into the structure and band gap of PANI. Through the analysis of the band gap it was shown that the structure of the polymer commonly displayed in literature is not the correct structure of the polymer. Our results suggest that when PANI is made electrochemically, the oligomer contains two quinoid units next to one another instead of the more usually represented regularly alternating benzoid and quinoid units. The results also suggest that when PANI is made using the oxidant ammonium persulfate, the polymer most likely contains a Michael adduct structure somewhere in the polymer chain which dominates PANI’s electronic properties. Author Keywords: 3-Methacryloxypropyltrimethoxysilane, Computational Chemistry , Corrosion , Polyaniline, Tetraethoxysilane
Bifacial Stone Tool Variability during the Late Paleoindian Period at Kruger 2 (BiEx-23), Eastern Townships, Québec
This thesis established the variability of Late Paleoindian bifacial stone tool assemblage from the Kruger 2 site. Kruger 2 is a basecamp occupied during the Pleistocene-Holocene transition in the Eastern Townships, Southern Quebec. The goal of this project is to quantify the variability observed in bifacial tools and to explain it. Geometrics Morphometrics and traditional attributed-base lithic analysis are used conjointly for this purpose. Geometrics Morphometrics are a set of methods that are used to distinguish groups based on their shape and to understand the differences between those groups. It is used to test the validity of the morpho-types used to classify bifacial tools found on Kruger 2 (bifaces, drills, Ste-Anne-Varney points, Agate Basin points, and other projectile points). In terms of explanation, the organization of technology postulates (sensu Nelson 1991) lies at the core of the research. The analysis involved defining the factors of biface shape variation and evaluating whether shape variation is caused primarily by raw material, function, tool life histories, or other design constraints. It was determined that all three of these factors contribute to shape differences. The data suggest that the primary factors are raw material availability and tool life histories – two factors intimately intertwined. In other words, it is the organization of technology that seems to be the driving explanatory force that accounts for shape variability. Author Keywords: Eastern Towhships, Geometrics Morphometrics, Late Paleoindian, Organization of technology, Pleistocene-Holocene Transition, Stonetool variability
Religion, Wilberforce’s Evangelicalism, and the Memoirs of Common British Soldiers, 1811-1863
This thesis examines low-ranking British soldiers’ memoirs in the nineteenth century to determine the extent to which they identified with Christianity and how their expressions of faith differed from each other. Using twelve narratives published between 1811–1863, it finds that all of these soldiers identified themselves with Protestant Christianity and, more importantly, considered irreligion an evil which could not be justified by any decent British citizen. Furthermore, it argues that soldiers’ identity construction was largely determined by the degree of depth of their religious understanding. It uses the work of William Wilberforce to contextualize these soldiers’ expressions of faith and demonstrates how military writing can be more fully understood as representing a spectrum between nominal Christianity and real or true Christianity. This project strives to demonstrate that the religiosity of eighteenth- and nineteenth-century Britain has a significant impact upon our understanding of their time. Author Keywords: Britain, Christianity, memoirs, Military, soldiers, William Wilberforce
Ostrich Eggshell from the Far Eastern Steppe
This study uses stable isotope analysis on both the organic and inorganic fractions of ostrich eggshell obtained from archaeological excavations in Mongolia, northern China, and southern Siberia. By establishing the δ13Corg, δ15N, δ13Cinorg, δ18O isotopic compositions of the eggshell of the Asian ostrich (Struthio asiaticus), this study provides insight into the maximum northern range of the species, which I suggest reached Lake Baikal, Siberia through the late Pleistocene, up to the Last Glacial Maximum. Through these isotopic data, the interactions between S. asiaticus and human forager groups are explored, specifically the trade of ostrich eggshell by hunter/gatherer populations in the early/middle Holocene. Because of deviations from the correlation between δ18O and latitude observed for other sites, the site of Shabarakh-usu may have been an aggregation point for ostrich eggshell from other locations. Movement of eggshell is observable from north to south but not from south to north on the basis of eggshell δ18O. Finally, I am able to develop a hypothesis regarding the drivers of species extinction. Specifically, I discuss trade in eggshell leading up to extinction as evidence for human pressure on S. asiaticus at a time when environmental shifts likely isolated populations in small regions of habitable landscape. I therefore implicate both changing environmental conditions and human pressure in my proposed explanation for the extinction of S. asiaticus. Author Keywords: Extinction, Holocene, ostrich, Pleistocene, Steppe, Struthio
Surface temperature regulation during stress exposure
The influence of stress exposure on the body temperature of vertebrates has been known for nearly two-thousand years. While the proximate mechanisms supporting this phenomenon are well described, the ultimate mechanisms remain enigmatic. In this thesis, I propose a novel hypothesis which states that changes in body surface temperature (henceforth "surface temperature") following stress exposure occur to reduce energetic expenditure toward thermoregulation, thus freeing energy for use in the stress response (hereafter, the "Thermoprotective Hypothesis"). Using a paired experimental design, I first show that black-capped chickadees (Poecile atricapillus, Linnaeus, 1766) exposed to repeated stressors decrease their surface temperatures at low ambient temperatures, and increase their surface temperatures at high ambient temperatures relative to unstressed controls. These changes in surface temperature contribute to a relative reduction in heat loss in the cold, and a relative increase in heat dissipation in the warmth among stress-exposed individuals, thus reducing their energetic demands toward more costly thermoregulatory strategies. Next, I show that stress-induced changes in surface temperature are most pronounced in chickadees that experience naturally-occurring resource-restrictions, suggesting that this response occurs to balance allocation of energy among the stress response and thermoregulation (i.e. a true energetic trade-off ). Third, I show that the magnitudes of chronic, stress-induced changes in surface temperature are highly variable among, and highly consistent within, chickadees, therefore suggesting that this response could hold adaptive significance if such variation among individuals is heritable. Finally, using domestic pigeons (Columba livia domestica, Gmelin, 1789) as a model species, I show that stress-induced changes in surface temperature are highly pronounced at bare tissues with a critical role in thermoregulation for some avian species (the bill), when compared with responses at surrounding bare tissues (the eye region). Together, these findings strongly support the Thermoprotective Hypothesis and suggest that endotherms may trade energetic investment toward thermoregulation with that toward the stress response in resource-limiting environments. Author Keywords: heat transfer, infrared thermography, stress physiology, surface temperature, thermoregulation, trade-off
Drink my beer, smoke my weed, my good friends are all I need
Past research has predominately supported an association between insecure attachment and substance use. More recent research has found that while individuals with secure attachment may use substances, they do so with less risk. The current study attempted to replicate the finding regarding secure attachment and substance use and examined the motivational drives behind why students use substances. A total of 318 undergraduate students completed self-report questionnaires examining peer attachment, alcohol and marijuana use, as well as motivations for use. Results indicated that students who reported low frequency use of alcohol or marijuana did not have significantly higher security ratings compared to students who reported increased use. Additionally, although hypothesized, secure attachment ratings were not associated with social facilitation or enhancement motivations. However, fearful and dismissing attachment ratings were both significantly associated with coping motives as predicted, while preoccupied and fearful attachment ratings were significantly associated with conformity motives. Lastly, results from multiple regressions suggest that coping and enhancement motivations are significant predictors of alcohol use, while enhancement motivations are marginally significant in predicting marijuana use. Author Keywords: alcohol, attachment, marijuana, motivation
An Exploration of Partnership Models for Urban Conservation Land Management in Ontario
Partnerships for management of public parks have a long history, but little attention has been given to the current models of partnerships during a period of municipal austerity in Ontario. Using a qualitative assessment of transcripts from representatives of 10 municipal partner groups, this research considers what some of the current models are, the impact that they may have, and how municipalities may foster these partnership arrangements. The participating organizations demonstrated that their governance models evolved to suit their mandate, activities, and scope of interaction with their municipality. Additionally, this research corroborates past findings that efficacy of an organization is tied to their ability to partner with other agencies and act as a capacity amplifier. These results demonstrate how municipal conservation partnerships can be effectively applied to create enhanced financial outcomes and improved community engagement, while delivering community based environmental programming. Author Keywords: Conservation, Environmental Stewardship, Municipal Management, Partnership, Social Ecology, Urban Parks
Morphology, Production and Trade
The Africana IIA, an amphora subtype of the Africana II class, was produced in Africa Proconsularis (the present-day Tunisian Sahel) during the mid-Roman Imperial period (from the late 2nd c. A.D. to the middle decades of the 3rd c. A.D.), and was distributed around the western Mediterranean. Scholars have noted meaningful morphological variations on this subtype’s rim but had overlooked the information that these rims may convey. The preliminary analysis of the variations found on Africana IIA amphora rims yielded possible connections to various production sites or regions, distribution samples, and/or consumption sites, and suggested that at least some of the rim variants were indicative of origin. The rim variants also seemed to correlate to different trade routes, and potentially, different trade mechanisms, including private versus State interests. Author Keywords: Africa Proconsularis, Africana IIA amphora, ancient economy, Byzacena, ceramics, fabric analysis
Characteristics of Models for Representation of Mathematical Structure in Typesetting Applications and the Cognition of Digitally Transcribing Mathematics
The digital typesetting of mathematics can present many challenges to users, especially those of novice to intermediate experience levels. Through a series of experiments, we show that two models used to represent mathematical structure in these typesetting applications, the 1-dimensional structure based model and the 2-dimensional freeform model, cause interference with users' working memory during the process of transcribing mathematical content. This is a notable finding as a connection between working memory and mathematical performance has been established in the literature. Furthermore, we find that elements of these models allow them to handle various types of mathematical notation with different degrees of success. Notably, the 2-dimensional freeform model allows users to insert and manipulate exponents with increased efficiency and reduced cognitive load and working memory interference while the 1-dimensional structure based model allows for handling of the fraction structure with greater efficiency and decreased cognitive load. Author Keywords: mathematical cognition, mathematical software, user experience, working memory
Examining Strategies of New Public Management in Homelessness Policy
This research is a critical analysis of coordinated access as an approach to addressing homelessness focusing on Peterborough, Ontario as a case study. This study is situated in scholarship that explores the presence of strategies of New Public Management in social service and healthcare delivery. Balancing the methods of Smith’s (2005) Institutional Ethnography and Bacchi’s (2009) What is the Problem Represented to Be approach I investigate the way that Federal, Provincial and Municipal homelessness policies organize themselves as instruments of power and I connect this analysis to the accounts of staff working within the homelessness response system. I discover the frame of vulnerability through which homelessness is addressed to be an individualizing mechanism that facilitates the downloading of responsibility for social welfare to local governments without adequate resources. I argue that the consequence of an under resourced system is that only the most extreme forms of suffering can be addressed, and the tools used to decipher who is most vulnerable do not account for structural inequalities. Author Keywords: Coordinated Access, Homelessness, Homelessness Policy, Institutional Ethnography, Neoliberalization, New Public Management
Nassau Mills Complex
The objective of this thesis is to develop and implement a heritage plan for the Nassau Mills Complex, a locally-significant Euro-Canadian historical site that operated on what is now Trent University’s campus in Peterborough, Ontario. Within the framework of public archaeology and Cultural Heritage Management (CHM), emphasis is placed on the importance of protecting the site and its historic remains in order for present and future generations to appreciate and enjoy. Data was gathered by way of field and archival research, as well as through consultations with various archaeological and museological professionals. Of particular concern is evaluating how the Complex is significant to Peterborough, how it should be commemorated, public engagement and the importance of information accessibility, and the potential issues that may arise as a result of this project. In addition, recommendations regarding how the site and its collections should be preserved and presented to the collective society are also examined. Author Keywords: Cultural Heritage Management, Nassau Mills Complex, Peterborough, Preservation, Public Archaeology, Trent University
Changes in the Representations of Women from the 1980s Turkish Cinema to New Turkish Cinema
The thesis examines the changes in the representations of women in Turkish cinema from the 1980s through the 2000s in terms of semiotic codes. To demonstrate the shifts of the representations of women over three decades, four films directed by two representative filmmakers of the 1980s and the 2000s are analyzed within the context of gender codes: A Sip of Love (Atıf Yılmaz/1984), The Night, Angel and Our Gang (Atıf Yılmaz/1994), The Third Page (Zeki Demirkubuz/1999) and Envy (Zeki Demirkubuz/2009). Using gender as code in deconstructing women’s characteristics and their representations in the films, the research highlights the structural image of women in the semiotic sense. The stereotypical representations in Turkish cinema question social norms, patriarchy, and Islamic norms in Turkey. Author Keywords: Gender codes, Islam, Patriarchy, Semiotics, The representations of women , Turkish cinema

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Graduate student theses produced at Trent University. You may also browse theses and dissertations by year, program, or author.

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1973 - 2033
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Format: 2023/10/01

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