Graduate Theses & Dissertations

Pages

Acidification of lakes in northern Saskatchewan
The emission of acid precursors by large point sources in Western Canada (such as the Athabasca Oil Sands Region) has prompted studies into the possible impact to downwind aquatic and terrestrial ecosystems. Sensitivity of catchments to acidic deposition was estimated for the total lake population of northern Saskatchewan (n=89,947) using regression kriging. Under the Steady State Water Chemistry model, a range of 12-15% of the total catchment population was predicted to be in exceedance of critical loads under 2006 deposition levels and 6% of catchments were estimated to be very sensitive (pH below 6 and acid neutralizing capacity, alkalinity, calcium below 50 eqL-1). Temporal changes in soil and water chemistry estimated for 18 Alberta and Saskatchewan catchments using the Very Simple Dynamic and PROFILE models showed that changes in soil base saturation and lake acid neutralizing capacity between 1850 and 2100 were slight, declining 0.8% and 0.9% by 2012, respectively. Author Keywords: acidification, critical loads, exceedance, PROFILE, regression kriging, VSD
Application of One-factor Models for Prices of Crops and Option Pricing Process
This thesis is intended to support dependent-on-crops farmers to hedge the price risks of their crops. Firstly, we applied one-factor model, which incorporated a deterministic function and a stochastic process, to predict the future prices of crops (soybean). A discrete form was employed for one-month-ahead prediction. For general prediction, de-trending and de-cyclicality were used to remove the deterministic function. Three candidate stochastic differential equations (SDEs) were chosen to simulate the stochastic process; they are mean-reverting Ornstein-Uhlenbeck (OU) process, OU process with zero mean, and Brownian motion with a drift. Least squares methods and maximum likelihood were used to estimate the parameters. Results indicated that one-factor model worked well for soybean prices. Meanwhile, we provided a two-factor model as an alternative model and it also performed well in this case. In the second main part, a zero-cost option package was introduced and we theoretically analyzed the process of hedging. In the last part, option premiums obtained based on one-factor model could be compared to those obtained from Black-Scholes model, thus we could see the differences and similarities which suggested that the deterministic function especially the cyclicality played an essential role for the soybean price, thus the one-factor model in this case was more suitable than Black-Scholes model for the underlying asset. Author Keywords: Brownian motion, Least Squares Method, Maximum Likelihood Method, One-factor Model, Option Pricing, Ornstein-Uhlenbeck Process
Active Neighbourhoods Canada
This research considers the historic context of power that planning operates within, and looks at the ways in which certain community members are marginalized by traditional planning processes. Participatory planning, which has theoretical roots in communicative planning theory, may have the potential to shift the legacy of power and marginalization within planning processes, resulting in improved planning outcomes, more social cohesion, and a higher quality of urban life. I used a community-based research approach to evaluate approaches to participatory urban planning in Peterborough, Ontario. I worked with a community-based active transportation planning project called the Stewart Street Active Neighbourhoods Canada project. This thesis evaluates the participatory planning approaches employed in the project, and determines if they are effective methods of engaging marginalized community members in planning. The research also identifies the professional benefits of participatory planning, and examines the barriers and enablers to incorporating participatory approaches into municipal planning processes. Finally, I developed a set of recommendations to implement participatory planning approaches more broadly in the city of Peterborough, Ontario. Author Keywords: active transportation, communicative planning theory, community-based research, community engagment, participatory planning, public participation
An Analysis of Zoning By-laws and Urban Agriculture in the City of Peterborough, Ontario
Urban agriculture (UA) is becoming increasingly prevalent in Canadian cities. Despite this municipal zoning by-laws often do not address UA explicitly. Using eleven interviews of urban agricultural participants a case study of the City of Peterborough’s zoning by-laws and the barriers they might present to UA was conducted. Research suggests that UA can provide many benefits to urban areas. The analysis found that the City of Peterborough’s zoning by-laws do not directly address UA. In order to enable the development of UA in the City of Peterborough its zoning by-laws will need to be redesigned to address and regulate UA directly. Author Keywords: By-laws, food systems, land use, municipal planning, urban agriculture, zoning
Representations of Aboriginal Health in the Media
The goal of the present study was to explore the overall discourse within media articles regarding Aboriginal health issues. The present research aimed to answer the following questions: What Aboriginal health issues are being discussed in the media? How are Aboriginal health issues being discussed in the media? And, does the media propagate power imbalances between Aboriginal and non-Aboriginal Canadians? A thematic analysis was conducted, coopting aspects of Critical Discourse Analysis (CDA) to assess media content. Four CDA devices were used: overlexicalisation, structural oppositions, nominalizations and functional nominations, and concessions and hedging. Results suggest that while there are disparities in health outcomes between Aboriginal and non-Aboriginal Canadians, it is not widely reported in the media. The thematic analysis of 208 articles revealed patterns of stereotypical ideologies and negative framing appearing in media articles, the creation of an us versus them narrative, and themes of out of sight, out of mind, criminalizing Aboriginal Canadians, politicizing health, and access to health services. Author Keywords: Aboriginal Health, Communication, Health, Media, Psychology, Thematic Analysis
Practicing and Rewarding Task-Relevant Motor Variability to Optimize Motor Performance
It is universally accepted that human motor performance is variable in both its timing and spatial qualities. However, it is unclear to what extent motor variability impedes performance when learning a new skill and to what extent it enables our ability to learn. The first experiment examined whether performance during a test task depended on whether participants practiced to constrain or vary the task-relevant parameter. Participants used their right hand to make simple point-to-point movements. Results demonstrated the importance of paying attention to test task demands to evaluate which form of practice is most beneficial. The second experiment examined whether levels of variability could be manipulated using a reward-based paradigm to enhance learning when adapting to a perturbation of a simple visually-guided reaching movement. A reward-based feedback task was designed to encourage exploration along the task-relevant dimension, specifically movement direction variability. Overall, I did not find any significant results. Author Keywords: Adaptation, Motor Control, Motor Learning, Reaching
Robert Bringhurst and Polyphonic Poetry
Robert Bringhurst states that polyphonic art is a faithful, artistic reflection of the multiplicity of the world’s ecosystems. This ecocritical perspective recognizes that human art informs our understandings of the world, and therefore artists have a moral obligation towards that world. In Chapter One I argue that mimesis should be reclaimed as a useful literary category since all art, regardless of intentions, has an effect on both culture and the natural world. In Chapter Two I argue that by reconnecting publishing craft and philosophy, our books can serve to bring us more in tune with the structures of the natural world. I conclude in Chapter Three by asking how a counterpublic consciousness can be cultivated, and how Bringhurst’s mission of transforming culture might be fully realized. Altogether, this view of literature offers an antidote to Western culture’s destructive tendencies towards the natural world. Author Keywords: Bringhurst, ecocriticism, mimesis, poetry, polyphony, typography
Long-Term Population Dynamics of an Unexploited Lacustrine Brook Trout (Salvelinus fontinalis) Population
Long-term studies of demographic processes such as survival and abundance conducted in unexploited systems provide unique insight into the natural population ecology of fish, but are rarely available. I used historical tagging records of a sanctuary population of brook trout (Salvelinus fontinalis) in Algonquin Park, Ontario to investigate long-term population dynamics in an unexploited population. Adult brook trout in Mykiss Lake (23.5ha) were surveyed and tagged biannually (May and October) between 1990 and 2004. Open-population capture-mark-recapture models were used to test the importance of time, size, sex and season on estimates of apparent survival and abundance. Seasonal population growth and recruitment were estimated and compared with large-scale climate indices. Time-dependent survival and abundance estimates fluctuated, with distinct periods of increase. Population growth and recruitment were positively correlated with summer NAO and ENSO values, whereas survival was negatively correlated. Seasonally, larger individuals experienced higher apparent survival during winter and decreased survival during summer. These findings provide valuable insights into the natural demography of unexploited brook trout populations, and should help inform sustainable management of inland fisheries. Author Keywords: capture-mark-recapture, long-term, population dynamics, Salvelinus fontinalis, seasonal variation, survival
Bioremoval of copper and nickel on living and non-living Eugelna gracilis
This study assesses the ability of a unicellular protist, Euglena gracilis, to remove Cu and Ni from solution in mono- and bi-metallic systems. Living Euglena cells and non-living Euglena biomass were examined for their capacity to sorb metal ions. Adsorption isotherms were used in batch systems to describe the kinetic and equilibrium characteristics of metal removal. In living systems results indicate that the sorption reaction occurs quickly (<30 min) in both Cu (II) and Ni (II) mono-metallic systems and adsorption follows a pseudo-second order kinetics model for both metals. Sorption capacity and intensity was greater for Cu than Ni (p < 0.05) and were described by the Freundlich model. In bi-metallic systems sorption of both metals appears equivalent. In non-living systems sorption occurred quickly (10-30 min) and both Cu and Ni equilibrium uptake increased with a concurrent increase of initial metal concentrations. The pseudo-first-order model was applied to the kinetic data and the Langmuir and Freundlich models effectively described single-metal systems. The biosorption capacity of Cu (II) and) was 3x times greater than that of Ni (II). Sorption of one metal in the presence of relatively high concentrations of the other metal was supressed. Generally, it was found that living Euglena remove Cu and Ni more efficiently than non-living Euglena biomass in both mono- and bi-metallic systems. It is anticipated that this work should contribute to the identification of baseline uptake parameters and capacities for Cu and Ni by Euglena as well as to the increasing amount of research investigating sustainable bioremediation. Author Keywords: accumulation, biosorption, Cu, Euglena gracilis, kinetics, Ni
On (Digital) Photographic Image-Objects
On the first page of the much read, Camera Lucida, Roland Barthes reveals his motive: “I was overcome by an “ontological” desire: I wanted to learn at all costs what Photography was “in itself,” by what essential feature it was to be distinguished from the community of images.” The impetus of this thesis might be called a Barthesian desire to learn what distinguishes digital photographic images from all other photographic images. Throughout, I ask: what is a digital image? The first exploratory turn reflects upon photographs and touch. While photographs are objects that are both touched and touching, digital images are inscrutable data assemblages that resist touch and are predisposed to speed. Digital images cannot be touched, yet are responsive to touch. Through the mediating magic of touch sensitive glass, we command digital images to move. Chapter two considers prevailing late twentieth century theory on the digital photograph that claims the eclipse of film by digital imaging will render [digital] photographs totally unreliable documents. The results have been surprising; although suspicion about digital image bodies has crept into the cultural psychological fabric, I argue that we still believe in the basic veracity of [digital] photographic images. Finally, I turn my attention to the objecthood of digital imageobjects in a discussion of the widely unacknowledged materiality of data. Digital image-objects—those speedy, untouchable, dubious, things—are heavy. The weight of their bodies moving in the vast—unseen—global technological infrastructure is the burden of my final reflection. Author Keywords: death of film, digital materiality, digital photographic realism, ontology of the image, philosophy of photography, photography after photography
Understanding the Role of Lived Experience in Community Leaders’ Vision and Governance of Economic Development and Sustainability in Rurally Situated Small Cities
Sustainable development is normative - making decisions in the present that construct the experience of place for the future. It is primarily driven by global measures developed to meet the needs of the present while ensuring future generations can meet their own needs. These measures attempt to balance economic prosperity, social justice, and environmental stewardship in many nations. This attempt to balance a plurality of outcomes creates socio-political tensions in choosing between alternatives. These barriers and tensions are characterized through the neoclassical vision of: economics as a science, utility maximization, and alienation of people. This thesis explores the lived experience of community leaders in Peterborough, Ontario as they navigate a contentious and current debate of where to relocate a casino in the region. The results focus on the tension experienced by community leaders as they seek to balance elements of care, while preserving neoclassical values of growth, individualism, freedom of choice, and interconnectedness. The thesis concludes with a model that works towards an understanding of the role of lived experience in economic development decision-making in rurally situated small cities, and recommendations for further research and policy recommendations. Author Keywords: economic development, governance, lived experience, small city, sustainable development, vision
Relationships between Dissolved Organic Matter and Vanadium Speciation in the Churchill River, MB and the Mackenzie River Basin, NWT using diffusive gradients in thin films (DGT)
This study examines the influence of dissolved organic matter (DOM) on dissolved vanadium (V) speciation in the Churchill River and Great Slave Lake using diffusive gradients in thin film (DGT). Vanadium is commonly found in natural environments such as rivers, lakes and oceans. It regulates normal cell growth, but in excessive amounts, it can have toxic effects on human and aquatic organisms. The use of in situ, time integrated DGT devices allows to better (1) monitor the most bioavailable fraction of V, the DGT-labile V, in Arctic Rivers and (2) assess the influence of DOM on dissolved V speciation. Higher DGT-labile V was found in the the central regions of the Mackenzie River (MR), with an average of 7.7 ± 2.3 nM, likely due to sediment leaching and permafrost thawing. The Churchill River and Great Slave Lake (GSL) showed lower DGT-labile V levels (2.2 ± 1.6 nM and 3.6 ± 2.7 nM, respectively), compared to central regions in MR. The CR DGT-labile V concentrations was positively correlated to protein-like DOM concentration and abundance (r = 0.3, p < 0.05). The data collected from this study will help in developing new strategies regarding environmental health and impact assessments of environmentally hazardous waste that consist of potentially high levels of toxic vanadium species. Developments in the use of DGT devices as a sampling method will also aid in future studies involved in analyzing environmental health and specifically dissolved V species in natural waters. Author Keywords: diffusive gradients in thin-films, dissolved organic matter, fluorescence, mass spectrometry, UV-Vis, vanadium

Pages

Search Our Digital Collections

Query

Enabled Filters

  • (-) ≠ Biogeochemistry

Filter Results

Date

1974 - 2024
(decades)
Specify date range: Show
Format: 2024/03/29