254,893 Works

Studies of atmospheric properties for optical ground-based astronomy and methods to enhance laser guide star adaptive optics performance

Joschua Andrea Hellemeier
Ground-based astronomy suffers from waveform distortion produced by the turbulent atmosphere, which prevents telescopes from reaching diffraction-limited resolution. Modern large telescopes and next generation extremely-large telescopes use or will use adaptive optics systems with laser guide stars to correct for atmospheric wavefront distortion. The first part of the thesis deals with astronomical site testing and the second part with methods for adaptive optics system improvement. Meteorological data for 15 observatory sites were studied. Monthly averages...

Construction et transformation de l'imaginaire social de la religieuse au XVIIIe siècle

Marilyse Turgeon-Solis
Eighteenth century authors’ fascination with the figure of the nun is attested by its presence in the literary landscape. This presence has led us to question the social stakes behind its protean representations. Utilization of this figure is far from being insignificant as it often appears to be strategic, and above all, is highly rooted in the social and political context of the century. Although the tactical use of nuns as characters is extensive throughout...

Interpreting fossils of fly-speck fungi using comparative anatomy and phylogenetics

Ludovic Le Renard
Critical interpretations of fossil fungi combined with phylogenies of living species have the potential to reveal patterns of character evolution and to inform estimates of the geological timing of fungal radiations. Some of the best fungal fossils are of thyriothecia, formed by fly-speck fungi. A thyriothecium is a minute fungal sporulating structure, with a flat scutellum and a shield-like upper surface. Scutella have distinctive cell patterns that are formed by a sequence of hyphal branching...

The interpretation of gene coexpression in systems biology

Marjan Farahbod
One of the key features of transcriptomic data is the similarity of expression patterns among groups of genes, referred to as coexpression. It has been shown that coexpressed genes tend to share similar functions. Based on this, a common assumption is that gene coexpression is a result of transcriptional regulation and therefore, regulatory relationships could be inferred from coexpression. However, success in inferring such relationships has been limited and there are questions about the source...

Mapping urban trees with deep learning and street-level imagery

Stefanie Lumnitz
Planning and managing urban trees and forests for livable cities remains an outstanding challenge worldwide owing to scarce information on their spatial distribution, structure and composition. Sources of tree inventory remain limited due to a lack of detailed and consistent inventory assessments. In practice, most municipalities still perform labor-intensive field surveys to collect and update tree inventories. This thesis examines the potential of deep learning to automatically assess urban tree location and species distribution from...

Assessment of selected six sigma tools to improve food safety outcomes in a fresh - cut produce plant

Rebecca L. Robertson
Using a carrot processing line in a fresh-cut produce processing plant, it was found that Failure Mode and Effects Analysis (FMEA) provided a more accurate portrayal of the risk that is associated with a fresh-cut processing line than that provided by a conventional Hazard Analysis. This conclusion is based on the fact that FMEA clearly indicates the residual risk that is left after risk-mitigating activities are in place, and identifies the variables responsible for the...

A Monte Carlo inverse treatment planning algorithm for trajectory-based volumetric modulated arc therapy with applications in stereotactic radiosurgery, total body irradiation and patient-specific quality assurance

Shiqin Su
The main objective of this thesis is to present a full Monte Carlo (MC)-based inverse treatment planning method for trajectory-based volumetric modulated arc therapy (TVMAT). TVMAT uses continuous and simultaneous gantry and couch rotation to reduce the radiation exposure of normal tissues. However, commercial treatment planning systems for conventional medical linear accelerators do not provide dose calculation of such a beam trajectory. It has been shown that a full MC-based optimization can reduce the optimization...

An investigation into the utility of guilt by association machine learning algorithms for the prioritization of autism spectrum disorder candidate risk genes

Margot Patricia Rainbow Gunning
Autism spectrum disorder (ASD) is a neurodevelopmental disorder characterized by impairments in social interaction and communication, and restrictive repetitive behaviours or interests, with extreme phenotypic and genetic heterogeneity. Currently, genetic association studies have identified 90 risk genes with high confidence out of an estimated 1000. Researchers have begun to use machine learning methods leveraging heterogeneous biological network data in attempts to aid in discovery of ASD risk genes. However, the real-world utility of these studies...

Making kalamkari textiles : artisans and agency in Coromandel, India

Sengupta Rajarshi
The full abstract for this thesis is available in the body of the thesis, and will be available when the embargo expires.

Automated tuning of wireless mesh networks for smart meter applications

Parham Zarei
Many power utilities use wireless mesh networks to interconnect the smart meters that support monitoring, protection and optimization of the distribution grid. Network performance is critically dependent on the distribution of smart meters/mesh nodes and the path-loss over the links between nodes and degrades as the number of nearest neighbours seen by each node: 1) increases in regions of high node density (leading to mutual interference) or 2) decreases in regions of low node density...

Secular trends in risk of incident cardiovascular events in rheumatoid arthritis relative to the general population

Kiana Yazdani
Background: Recent evidence suggests a significant decline in all-cause and cardiovascular mortality over time in rheumatoid arthritis (RA) relative to the general population. This improvement in mortality could be due to improvement in risk of cardiovascular events that are the leading cause of excess deaths in RA. Our objective was to evaluate secular trends in ten-year risk of incident a. Acute Myocardial Infarction (AMI), and b. Cerebrovascular Accidents (CVA), in incident RA cohorts, according to...

Functional brain networks underlying working memory performance in schizophrenia : a multi-experiment approach

Nicole A. Sanford
Working memory (WM), defined as actively holding and/or manipulating information in mind, is central in guiding behaviour. WM is also a core domain of impairment in schizophrenia which substantially impacts functional outcome. Although the dorsolateral prefrontal cortex (DLPFC) has been implicated as a source of WM deficits in schizophrenia, these deficits may be better characterized within the framework of functional connectivity of distributed brain regions. However, in task-state functional magnetic resonance imaging (fMRI) research, the...

Influence of kin, density, soil inoculum potential and interspecific competition on interior Douglas-fir (Pseudotsuga menziesii var. glauca) performance and adaptive traits

Amanda Karlene Asay
Positive interactions between plants, in addition to competition, can help shape a plant community and ecosystem. Positive interactions can come in the shape of intraspecific interactions such as kin selection, or interspecific interactions, such a mycorrhizal symbiosis. Previous studies have provided evidence for both of these processes occurring in interior Douglas-fir (Pseudotsuga menziesii var. glauca) with the possibility that they are linked. This thesis focuses on potential influences on the processes of kin recognition and...

Patient stories project : a solution-based approach to decrease burnout in critical care

Lara Nicole Gurney
Problem: Burnout is particularly prevalent among nursing staff in intensive care units (ICUs), and it is associated with job dissatisfaction, staff shortages, and high turnover rates (Moss, Good, Gozal, Kleinpell, & Sessler, 2016). Burnout is also related to negative outcomes associated with the quality and safety of patient care, such as medical errors, decreased patient satisfaction, and higher rates of health care-associated infections (Moss et al., 2016). Nurse burnout is a significant problem in high...

Deploying low cost virtual reality for archaeological research

Jem Patrick Tari
In recent years powerful and inexpensive Virtual Reality ecosystems have become widely available, a side effect of the cellphone revolution. Both the archaeological and software development communities have struggled with both the pace of change and the unique properties of the medium, with the result that many projects have had mixed and inconsistent outcomes. In this thesis I argue that VR adds significant adjunctive capabilities to several areas of archaeological inquiry—wayfinding, space and place, landscape...

Participating in other worlds : locating gurbilās literature in the wider world of Brajbhasha traditions

Julie Vig
My dissertation asks the question: How can Sikh cultural production in the premodern and early modern period be placed within and understood through wider cultural and literary movements and forces such as the world of Brajbhasha traditions? While such wider forces have shaped scholarly discussions about the formation of other communities and textual traditions in early modern India, they have only recently received attention in Sikh and Punjabi Studies. This recent scholarship by Dhavan, Murphy,...

Emma être les lignes : réceptions, lecteurs et lectrices de Madame Bovary de Flaubert

Anne-Claire Marpeau
This work carries on reading Madame Bovary by Flaubert. Although reading the novel threatened to be prohibited when it was first published in 1857, it progressively became mandatory in French studies in French high schools and at French universities and Anglo- American universities. The thesis explores the « classicisation » process of the novel as well as the reception of its principal character by three interpretive communities: journalists and critics who were Flaubert’s contemporaries, French...

Culturally appropriate community engagement in Vancouver's Chinatown

Tyler Tadao Taiming Mark
Vancouver’s Chinatown is the largest of its kind in Canada but is also, arguably, part of the economically poorest large urban postal code area. Despite its rising incomes and real estate prices, as indicators of growth, Chinatown has become increasingly polarized economically, as well as socially, by contesting ideals as to what actions should be taken to attempt revitalization. Therefore, I argue that Chinatown can be understood by two rationales. The first being through the...

“I thought I had empathy… but now I believe it was pity” : enhancing knowledge, empathy and harm reduction approaches among nurses working in concurrent disorder care

Emma Garrod
The full abstract for this thesis is available in the body of the thesis, and will be available when the embargo expires.

Investigation and characterization of microlenses for imaging reception in indoor optical wireless communications

Daniel Guerrero
The gain in popularity of optical wireless technologies over the past decade is the start of a revolution in optical technology. While we have seen commercial optical communication systems firmly establish themselves over the past decades, through the use of optical fibres for point-to-point optical communications, we are now beginning to see the emergence of mobile optical wireless technologies. Such technologies typically use portable imaging receivers and fixed indoor transmitters, such that data can be...

Hope for Chinese ecocities

Bei Jiang
This study focuses on the ecological and social metrics of sustainable cities in China. It presents a dialogic critique between Western scholars and local Chinese practitioners on how the ecocity concept has been framed locally in China. The dissertation consists of three papers, based on fieldwork and surveys conducted in the Sino-Singapore Tianjin Eco-City (SSTEC) project. Chapter 2 reviews the theories and modern history of ecological planning, from which the concept of ecocity and “best...

Fluids and seismicity in subduction zone systems

Alexandre P. Plourde
I investigate earthquakes and slow-slip phenomena in subduction zones and their overlying forearcs, with a particular focus on how metamorphism and fluid-migration affect the locations and character of earthquakes. I first focus on low-frequency earthquakes (LFEs) associated with episodic tremor-and-slip (ETS) down-dip of the megathrust zone on the subduction interface. I search for LFEs in southern Cascadia and find 34 distinct families. As in other regions of Cascadia, LFE hypocenters suggest that the plate interface...

Use of estrous expression within reproductive management and its association with conception and ovulation rates in dairy cows

Tracy Anne Burnett
Automated technologies have been developed to improve dairy cattle reproductive efficiency, yet there is still need for better understanding of how these technologies can be used and determine how the information collected relates to key events important for fertility. The aims of this thesis were to determine 1) if automated activity monitors (AAM) can predict estrus and be used within reproductive management, and 2) the interrelationship between estrous expression, ovulation and fertility. In Chapter 2,...

Comparative analysis of Salmonella-infecting bacteriophages and characterization of bacteriophage-host interactions

Karen Fong
Numerous outbreaks in North America have been attributed to non-typhoidal Salmonella enterica. Bacteriophages (phages), viral bacterial predators, represent agents that could be used for controlling Salmonella; yet, relatively little is known about phages and their host interactions. Therefore, the purpose of this thesis was to characterize phages of Salmonella on their phenotypic and genomic determinants and phage-host interactions. Salmonella phages (n=97) were isolated from sites within British Columbia, Canada. Host range analysis revealed diverse patterns...

Radiofluorinated amino acids for oncological positron emission tomography imaging

Milena Čolović
The full abstract for this thesis is available in the body of the thesis, and will be available when the embargo expires.

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