Graduate Theses & Dissertations

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An Evaluation of Wastewater Treatment by Ozonation for Reductions in Micropollutant Toxicity to Fish
Micropollutants are discharged into the aquatic environment with industrial and domestic wastewater and these compounds may cause toxic effects in aquatic organisms. In this study, the toxic effects to fish of micropollutants extracted from ozonated and nonozonated municipal wastewater effluent (MWWE) were measured in order to assess the effectiveness of ozonation in reducing toxicity. Juvenile rainbow trout (Oncorhynchus mykiss) injected with extracts prepared from ozonated MWWE had significantly reduced induction of plasma vitellogenin (VTG), significantly reduced hepatic total glutathione (tGSH) levels and an elevated oxidized-to-total glutathione (GSSG-to-tGSH) ratio. Exposure of Japanese medaka (Oryzias latipes) embryos to extracts prepared from both ozonated and non-ozonated MWWE resulted in elevated developmental toxicity in both treatment groups. These results indicate that wastewater treatment by ozonation reduces the estrogenicity of wastewater, but treatment may induce oxidative stress and embryonic developmental toxicity due to the production of toxic by-products. Author Keywords: Estrogenicity, Micropollutants, Oxidative stress, Ozonation, Toxic by-products, Wastewater
An Exploration of Attachment Influences on Rape Attitudes
While there is substantial research on the influence of adverse childhood experiences on sexual offending behaviours and attachment representations on sexual offending behaviours, few studies to date have explored how adverse childhood experiences and attachment representations act together to influence the development of rape attitudes in a non-clinical population. The purpose of this thesis was to explore how childhood experiences and attachment may help to understand the development of rape attitudes. Data were collected from 273 undergraduate students who completed self-report questionnaires pertaining to their attachment, childhood experiences and rape attitudes. Correlational and Structural Equation analyses were computed, and the results did not find support for the simultaneous influence of adverse childhood experiences and attachment representations on rape attitudes. Given that the sample was primarily female (83%), the results indicate that the outcomes of adverse childhood experiences on sexual attitudes may differ by gender. Understanding the formation of rape attitudes is important to understand the motivations behind sexual assault behaviours. Author Keywords: adverse childhood experiences, rape attitudes
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
An Investigation of Load Balancing in a Distributed Web Caching System
With the exponential growth of the Internet, performance is an issue as bandwidth is often limited. A scalable solution to reduce the amount of bandwidth required is Web caching. Web caching (especially at the proxy-level) has been shown to be quite successful at addressing this issue. However as the number and needs of the clients grow, it becomes infeasible and inefficient to have just a single Web cache. To address this concern, the Web caching system can be set up in a distributed manner, allowing multiple machines to work together to meet the needs of the clients. Furthermore, it is also possible that further efficiency could be achieved by balancing the workload across all the Web caches in the system. This thesis investigates the benefits of load balancing in a distributed Web caching environment in order to improve the response times and help reduce bandwidth. Author Keywords: adaptive load sharing, Distributed systems, Load Balancing, Simulation, Web Caching
An Investigation of Rare Earth Element Patterns and an Application of Using Zn and Cd Isotope Ratios in Oysters to Identify Contamination Sources in an Estuary in Southern China
Environmental monitoring and investigation of metal biogeochemical cycling has been carried out in the Pearl River Estuary (PRE), an important and complex system in Southern China. In this study, rare earth element (REE) patterns as well as isotope ratios (i.e., Zn and Cd) were evaluated as tools to identify contamination sources in environmental compartments (i.e., water and suspended particles (SP)) as well as in oysters collected from estuarine sites. Results show elevated concentrations (also called anomalies) of Pr, Nd, Dy and Ho, relative to other REE elements, in water samples, potentially from REE recycling and other industrialized activities in this area. Unlike water samples, no REE anomalies were found in SP or oysters, suggesting that the dominate REE uptake pathway in oysters is from particles. Secondly, site to site variations in Zn isotope ratios were found in water and SP, showing the complexity of the source inputs in this area. Also, in estuarine locations, larger spatially differences in Zn isotope ratios were found in water collected in wet season than those in dry season, which may due to mixing of different source inputs under the water circulations in different seasons. A series of laboratory experiments were conducted during which changes in Zn isotope ratios were measured during uptake under varying salinity and Zn concentrations and during depuration. Neither in vivo Zn transportation among the various tissues within the oysters nor water exposure conditions (i.e., different salinities or Zn concentrations) caused Zn isotopic fractionation in the oysters. Cd and Zn isotope ratios were also determined in oysters obtained from the PRE. Large variations in Cd and Zn isotope ratios suggest that oysters were receiving contaminants from different input sources within the PRE. A consistent difference (approximately 0.67‰) was observed for Zn isotope ratios in oysters collected from the east side of the PRE compared to those from sampling locations on the western side of the PRE, suggesting different Zn sources in these two areas. Ultimately, by combining biogeochemistry with physiology, this study represents a first attempt to assess pollution status, monitor contaminants using oysters and model/identify contamination sources using both REEs and metal isotope ratios. Author Keywords:
An Investigation of the Impact of Big Data on Bioinformatics Software
As the generation of genetic data accelerates, Big Data has an increasing impact on the way bioinformatics software is used. The experiments become larger and more complex than originally envisioned by software designers. One way to deal with this problem is to use parallel computing. Using the program Structure as a case study, we investigate ways in which to counteract the challenges created by the growing datasets. We propose an OpenMP and an OpenMP-MPI hybrid parallelization of the MCMC steps, and analyse the performance in various scenarios. The results indicate that the parallelizations produce significant speedups over the serial version in all scenarios tested. This allows for using the available hardware more efficiently, by adapting the program to the parallel architecture. This is important because not only does it reduce the time required to perform existing analyses, but it also opens the door to new analyses, which were previously impractical. Author Keywords: Big Data, HPC, MCMC, parallelization, speedup, Structure
An Official Plan for Peterborough, Ontario
Using the Official Plan as the case study, this research examines the extent to which underrepresented groups are engaged in public consultation in the planning process for the City of Peterborough, Ontario, Canada. The Official Plan, along with the tools and secondary plans and policies which reinforce it, shape how people navigate and benefit from the built environment, such as access to public institutions and amenities, transit, parks, safe public space, quality housing, and more. This research frames the Official Plan as an opportunity for the city to demonstrate its new commitment to transparency and community engagement. Drawing on a range of experts and community members, and best engagement practices of other Canadian municipalities and nongovernmental organizations, a set of recommendations is proposed for the city’s community engagement framework. These recommendations emphasize an inclusive, democratic, and feminist approach to engagement and consultation which honours lived experience and local knowledge of diverse and underrepresented demographics and multi-sector stakeholders. Author Keywords: diversity, equity , inclusion, marginalized , public engagement, underrepresented
An assessment of the determinants of, or barriers to, successful municipal food waste management systems
Food waste (FW) disposal has negative implications for the social, economic, and environmental sustainability of communities. While some municipalities in Canada have made improvements to their FW management, others have not been successful. Considering the complexity of the issues integrated into municipal FW management (MFWM), a mixed methodological approach was used to understand the determinants of, or barriers to, successful MFWM systems. Methods included analysis of primary data from a household survey with a fixed response and open-ended questions, along with analysis of the secondary literature. A comparative analysis of the results was undertaken to determine similarities and differences between successful and less successful cases (Guelph and London, Ontario, respectively) and the broader empirical literature. The results suggest the success of MFWM is determined by the commitment of political decision-makers to implement FW policies backed by adequate regulations, high levels of perceived behavioural control over barriers to participating in MFWM programs, and the ability to finance user-friendly MFWM infrastructure. Recommendations are made to guide policies and programming on food waste management. Author Keywords: Components of Waste management System , Composting, Determinants of Success, Food Waste Reduction, Households Food Waste Behaviour, Municipal Food Waste Management System
Analysis and reactions of aqueous selenide and other reduced inorganic selenium compounds under anoxic conditions
Selenide is cited as a geochemically important selenium (Se) species, but it is unknown whether selenide is a stable aqueous ion in natural waters. The feasibility of using anoxic anion exchange chromatography (AEC) coupled to dynamic reaction cell-inductively coupled plasma-mass spectrometry to separate aqueous selenide was investigated with the goal of quantifying this anion to determine its importance in reducing waters. It was possible to qualitatively identify selenide using AEC, but much of the aqueous selenide oxidises to Se0 faster than the separation procedure could be completed. AEC analyses of solutions containing polyselenides produced peaks for unidentified Se compounds, which have been assigned tentative structures Se2O22-, Se2O32-, and Se2O62- based on close matches in retention time to stable S compounds. The results of this work show that aqueous selenide can be qualitatively observed in synthetic solutions using AEC, but it is unknown whether these conditions are relevant to natural waters. Author Keywords: anoxic speciation, polyselenides, selenide, selenium geochemistry, selenium speciation, selenoselenate
Analyzing agricultural decision making in the Late Roman Empire
In the Roman World, at least 80% and up to 95% of the population lived and worked in a rural environment, driving the agronomic economy of the empire. During the Late Roman Empire (AD 300-600), there were a number of widespread political, social, and economic changes faced by the people who made up the empire. Through all these changes, the empire maintained its tax collection and households maintained agricultural production. I will be examining settlement in the rural region of Isauria (Rough Cilicia) to understand the Late Roman agricultural production in a rural environment. This thesis focuses on the decision making that all economic levels of households would face when producing goods within this Late Roman Economy. Using an economic theory of the peasant economy, I develop a framework through which to view the agronomic production of the Late Roman Period which I use to understand the household as an agent. Author Keywords: Ancient Economy, Isauria, Late Roman, Peasant Economy, Roman Economy
Analyzing the Effectiveness of Social Movements Opposing Fossil Fuel Infrastructure
Blocking fossil fuel infrastructure projects like pipelines is increasingly being seen as a legitimate way for civil society groups to reduce global carbon emissions. This research project is an exploratory case study of the Trans Mountain pipeline in British Columbia and its opposition. My research question asks, ‘What has each tactic/strategy of opposition in the campaign to stop the Trans Mountain pipeline expansion accomplished, and how have they been effective? How can they be done more effectively?’ Through interviews and an autoethnography, my research explores the effectiveness of activists in this campaign. I analyze the results of my findings within social movement theory and other activist definitions of effectiveness from my literature review. The more significant findings from my research are that activists need to do a better job educating the public on the issue, need to direct more of their resources towards promoting a solution to the issue and make alliances with other movements and groups. This research project contributes to the literature on the effectiveness of oppositional strategies and tactics of pipeline resistance, as well as social movement theory. Author Keywords: British Columbia, pipeline, protest, strategy, tactic, Trans Mountain
Anarchist Periodical Press in the United States
This dissertation focuses on the English-language anarchist periodical press in the United States in the 1890s and early 1900s. Each of the three chapters of this dissertation examines one anarchist paper and its coverage of a specific issue. The first chapter focuses on Prison Blossoms, which was started by Alexander Berkman, Carl Nold, and Henry Bauer and written and circulated in the Western Penitentiary of Pennsylvania, and its engagement with Alexander Berkman's attempt to assassinate Henry Clay Frick. The second chapter examines Free Society, a weekly edited primarily by Abraham Isaak, and its contributors' writings on the assassination of President William McKinley by self-described anarchist Leon Czolgosz. Finally, the third chapter focuses on The Demonstrator, specifically its first volume which was edited by James F. Morton Jr. from the intentional community of Home, Washington, and the paper's work in supporting John Turner, the first anarchist targeted for deportation under the Immigration Act of 1903. Drawing upon critical discourse analysis, this dissertation incorporates examination of the context in which these papers were written (particularly the immediate concerns to which the papers' authors responded), the form and generic conventions of the anarchist press, including the approaches of the papers' respective editors, and the arguments advanced by their authors. It pays particular attention to the intertextuality of the anarchist press -- the ways in which those writing in anarchist papers addressed one another both within and across periodicals, generating anarchist thought through conversation and debate and enacting their anarchist ideals in the practice of publishing. This dissertation demonstrates that the anarchist periodical press, an element of anarchist history that has received little attention, offers important insights: it details how anarchists immediately responded to important issues of their time, and reveals the ways in which the emergence of anarchism was itself a collective effort, emerging from conversation, debate, and disagreement about how best to create radical change and what that change should look like. Author Keywords: anarchism, anarchist periodicals, critical discourse analysis, Free Society, Prison Blossoms, The Demonstrator

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Format: 2023/01/31