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Application of Machine Learning and Pyrite Geochemistry to the Identification of Paleoplacer Gold Sources at Pardo, Ontario, Canada
Get PDFFluvial conglomerate of the Huronian (2.45-2.20 Ga), Mississagi Formation from the southern Cobalt Basin in Pardo and Clement townships, Ontario, hosts detrital pyrite, uraninite, and free gold derived from an unknown source. This study aimed to determine the source of gold by using detrital pyrite as a proxy. To do this, pyrite was characterised, texturally and geochemically from the Mississagi Formation and potential sources within the Neoarchean basement. A Random Forest statistical classifier algorithm, trained on a global dataset, predicted pyrite classes mainly split between VMS (57%) and orogenic (39%), with minor input from epithermal-porphyry-skarn (3%), and sedimentary-hosted (0.6%) for detrital pyrite at Pardo. Textural and geochemical clues also point to similarity in some detrital samples with both VMS and orogenic style mineralization at Golden Rose, a former banded iron formation-hosted gold mine located 15 km north of Pardo
Investigating Socially Supported Technical Assistance for Older Adults
Get PDFThe growing older adult population and increased technology use benefit healthy aging, but older adults often face barriers to managing it effectively. Limited access to helpful resources usually leads them to seek support from individuals within their social circles, which we term ``technology caregivers''. Our research aimed to understand the nature of technical caregiving for older adults, focusing on password management. We interviewed 21 older adults and 16 caregivers to explore their experiences. We found that this caregiving role is usually created unofficially and is impacted by relationship dynamics. Caregivers often provided technical support for multiple tasks, requiring access to older adults' passwords and raising privacy concerns. Without password sharing, caregivers struggle to provide support, while older adults face barriers in obtaining help, creating tension between the two groups. Our findings emphasize the complex interplay between these two groups and the need to address the associated challenges
Meta-analytical and experimental studies investigating the effects of exposure to environmental contaminants in fish and amphibians
No full textThis thesis used meta-analytical and experimental studies to further the understanding of the effects of environmental contaminants (ECs) on fish and wildlife health and to provide data to support ecological risk assessment of priority substances. The first meta-analytic study (Chapter 2) summarizes the effect of EC exposure on fish glucocorticoid (GC) levels, and explores potential moderators that can account for variation in responses between studies. The findings from this study will improve the understanding of how ECs influence fish GC levels and will provide direction for future avenues of research. The first experimental study (Chapter 3) investigates the effects of two short-chain perfluoroalkyl carboxylic acids (PFCAs) on northern leopard frog (Rana [Lithobates] pipiens) tadpole growth and development metrics. The results suggest that short-chain PFCAs influence tadpole growth and development at environmentally-relevant concentrations. In addition, the short-chain PFCAs tested exhibited low bioconcentration potential in tadpoles. The next experimental study (Chapter 4) examines the chronic toxicity and bioconcentration of two short-chain perfluoroalkyl sulfonic acids (PFSAs) using northern leopard frog tadpoles. The results suggest that short-chain PFSAs influence tadpole hepatic health, alter tadpole lipid metabolism, and may exert endocrine-disrupting effects on tadpoles during early development. Similar to the previous experiment, PFSA concentrations in tadpoles were low, suggesting a low bioconcentration potential for short-chain PFSAs. These two experimental studies will provide essential information for ecological risk assessments of short-chain PFCAs and PFSAs. The second meta-analysis (Chapter 5) summarizes the relationship between EC exposure and amphibian susceptibility to parasitism. This study also explores potential moderators for the effects of EC exposure on amphibian susceptibility to parasitism. Additionally, this study identifies data gaps for several EC classes and parasite types. This chapter will further the understanding of factors contributing to increased amphibian susceptibility to parasitism after exposure to ECs, providing valuable information on factors potentially influencing amphibian population declines. Overall, this thesis highlights several important considerations for future ecotoxicity studies including establishing more rigorous reporting requirements for ecotoxicity studies, incorporating environmentally-relevant exposure concentrations, including multiple developmental stages of test subjects, and testing for net-effects of environmental contaminants
Embodying the Gaze: Exploring Ali Khan Vali’s Visual Narrative (1862-1900)
Get PDFThis thesis, by focusing on a photographic artifact created by Ali Khan Vali (1845-1902), explores the early development of photography in Iran. The research is organized around two key questions: the nature and function of the artifact. The first chapter uses a phenomenological approach to examine the artifact beyond typical labels like "album," viewing it as a personal autobiography that reflects, yet departs from, traditional Iranian visual practices. The second chapter explores the socio-political implications of photography, contrasting the official documentary photography of the royal regime with Ali Khan's personal images, showing how his work offered a distinct, individual perspective. The concept of geographical imagination is used to explain how he crafted a unique visual narrative with both retrospective and prospective elements. Overall, the thesis argues that photography in Iran was reshaped through local characteristics and illuminates how it helped construct both personal and political identities in 19th-century Iranian society
Calibration Techniques for Enhanced Neutrino Detection in Hyper-Kamiokande and WCTE Experiments
No full textHyperK is a next-generation long-baseline neutrino detector that aims to investigate crucial questions in experimental particle physics, which includes the search for CP violation in the lepton sector, the neutrino mass hierarchy, and the octant problem. To support this, accurate calibration of detection systems, such as multi-photomultiplier tubes (mPMTs) and Particle Identification (PID) systems is essential. The thesis addresses dark pulse calibration of mPMTs, which are integral to the WCTE detector and the Intermediate Water Cherenkov Detector (IWCD), a near detector of the HyperK project. Advanced timing calibration techniques in the WCTE experiment using time-of-flight (TOF) data and PID methods as well as optimization of electron-positron(e±) vetoing in the Aerogel Cherenkov Counters (ACT) upstream pair are also discussed. The results shows that a global separation cut is feasible with a 40% retention rate of muons and pions (μ±, π±) signal when rejecting over 99% of e±
Need Job, Will Travel: Questioning the making and unmaking of intersectional precarity in the SAWP
Get PDFThis thesis project provides an analysis of the SAWP, demonstrating how relations of power underpin its structure through the recreation of worker precarity and evaluates reform suggestions made by Canadian CSOs in their potential to challenge such relations of power. This project introduced the analytical tool of intersectional precarity which acknowledges the socially constructed categorization of the aspects of Mexican SAWP workers’ life and identity which are manipulated through relations of power. Document analysis was used to identify recurring reform suggestions made by Canadian CSOs and the impact of their advocacy within the Canadian Government. Despite a reluctance from the Canadian Government, my analysis showed that reform suggestions made by Canadian CSOs have the potential to address manifestations of precarity within Canada. As intersectional precarity in the case of Mexican SAWP workers is constructed across borders, I conclude that advocacy efforts must be undertaken in both Canada and in Mexico
Co-Designing Rural Transit For Aging-In-Place from a ‘Futures’ Perspective
Get PDFTransportation services play an important role in supporting people living in rural areas to age-in-place. For older adults, a lack of adequate transportation can contribute to isolation or the need to move out of their home. In a case study of a rural community in Eastern Ottawa, this study applied a speculative service design approach to designing transportation services with older community members. The research involved interviews focused on older adults’ lived experiences of transportation and their visions for improved services that support aging-in-place. Findings from this research identify transportation barriers encountered by older adults in rural Ottawa, the impacts of these barriers, and community driven perspectives on designing rural transportation. This research provide insight into established and emerging approaches for supporting aging-in-place through transportation services and makes recommendations relative to the present policy context in the City
Forest Bat Movement Ecology in and Around Urban Forest
No full textUnderstanding the effects of urbanization on habitat use of bats is essential for bat-friendly urban planning. We explored the use of the forest and adjacent, urban habitat for foraging and day-roosting of urban forest bats in the Rouge National Urban Park. We radio-tagged 48 big brown bats (Eptesicus fuscus) and 22 northern myotis (Myotis septentrionalis) across three summers (2021, 2022, and 2023). We deployed an array of omni-directional radio antennae connected to the Motus wildlife tracking system across roughly 2.5 km2 of forest and in surrounding suburban backyards. We identified precise roost locations daily using manual tracking. Big brown bats were detected foraging by both forest and backyard stations, and day-roosted primarily in suburban areas. Northern myotis were only detected foraging and day-roosting in the forest. Urban forest provides a refuge for forest-dependent species such as northern myotis and important foraging opportunities for synurbic species such as big brown bats
Computational approaches to art crime research : network analysis and the case of Ante Topić Mimara.
Get PDFThis thesis focuses on computational approaches to art crime research through a networked analysis centered on Ante Topić Mimara, a man who deceived the postwar restitution process and fraudulently claimed many artworks and objects of value. This study deploys network analyses and other traditional and digital methodologies to understand Mimara’s history and examine his position within the larger context of Nazi-era provenance research. By establishing the provenance histories of these stolen works though a close study of primary source archival documents, an analysis of social networks using collected data reveals otherwise hidden connections between key actors. This study contributes to the broader understanding of Mimara’s theft though an investigation of various networks surrounding his stolen paintings
