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2024 — Viscosity modeling of solvent-water-heavy oil/bitumen systems at high pressures and elevated temperaturesRésumé
It is widely accepted that enhancing heavy oil/bitumen recovery has become a priority though fundamentally challenging due to the rising oil consumption and gradual depletion of conventional oil. The hybrid solvent-steam injection has been considered to be one of the most important enhanced oil recovery (EOR) methods for a given heavy oil/bitumen reservoir with its main mechanisms related to viscosity reduction resulted from thermal energy as well as solvent dissolution. To quantify the viscosity for such mixtures, various correlations have been proposed but each of them has its own limitations and may lead to large deviations under certain conditions. It … Lire la suite
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2024 — Coping with the distribution change in soil classification with LIBSRésumé
Accurate classification of soil types is crucial for crop productivity. Among the soil analysis techniques, laser-induced breakdown spectroscopy (LIBS) has become a prominent technology for real-time characterization of soil properties. The recent rise in the use of machine learning (ML) techniques for processing LIBS spectra has made LIBS more attractive. However, due to variations in the physical properties and/or chemical composition of the soil samples, the distribution of spectral emission lines can be highly variable, which may lead to different distributions of LIBS spectra and make the training and test spectra not representative of each other. Hence the test performance … Lire la suite
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2024 — Exploring the impact of limited information in active Bayesian learningRésumé
We tackle the problem of Noisy Bayesian Active Learning in a limited information setting. Originally explored by Cecchi and Hegde1 , this problem involves a Bayesian learner that sequentially selects oracles to determine the true class label of an incoming object, with the goal of minimizing the number of samples while maintaining a low error probability. The oracle's response is not a direct class label but a cluster label that is corrupted by noise. Additionally, the learner is only given an estimate of the true quality of those responses. We extend Cecchi and Hegde's framework to a more general scenario, … Lire la suite
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2024 — Search Timelines: Contextualized search history in support of exploratory searchRésumé
The timespan over which exploratory searching can occur, as well as the scope and volume of the search activities undertaken, can make it difficult for searchers to remember key details about their complex search tasks. These difficulties are present both during a single search session and when resuming a search task that spans multiple sessions. Existing public digital library search interfaces do not provide adequate support to allow patrons to pursue a complex search task for a prolonged period across multiple sessions. In this thesis, I present a novel search interface designed to support cross-session exploratory search in a public … Lire la suite
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2024 — Future nostalgia in the twenty-first century: Hauntology, hermeneutics, and historicity in contemporary popular musicRésumé
This thesis offers a critical analysis and discussion of the philosophical and popular culture concept of hauntology and its application to popular music and theory of history, arguing that hauntology is limited in ways that make it unequipped for understanding popular music’s historicity as the form develops into the 2020s. Drawing on UK artist Dua Lipa’s 2020 album Future Nostalgia as a case study, the argument suggests that recent developments in music production and consumption challenge the hauntological understanding of pop’s historicity. It concludes that instead of looking at the historical in pop through the lens of hauntology, popular music’s … Lire la suite
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2024 — Analysis of dissolved organic matter character and dynamics using optical techniques in prairie wetland pondsRésumé
Carbon plays an important role in a variety of Earth’s biogeochemical processes, through its various reservoirs and the interconnections between them. The hydrosphere is an important reservoir for carbon, and inland waters have often been regarded as unimportant in carbon biogeochemical cycling. However, important transformations and transport mechanisms occur within inland waters. Wetlands are an example of this, where carbon is in flux with the atmosphere and hydrosphere. Dissolved organic carbon (DOC), the carbon fraction and majority of dissolved organic matter (DOM), is found in the earth’s aquatic environments, is an important connection in the carbon cycle between terrestrial and … Lire la suite
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2024 — Prevalence and predictors of alcohol use disorder among Canadian Armed Forces members and veterans with military sexual traumaRésumé
Military sexual trauma (MST) is a pervasive issue that is associated with adverse psychological and physical health sequelae (e.g., chronic health conditions, mental health disorders, suicidal ideation). Alcohol use disorder (AUD) is positively associated with MST and may exacerbate physical and mental health conditions. An elevated lifetime prevalence of MST was recently reported among Canadian Armed Forces (CAF) Members and Veterans. Still, research examining the relationship between MST and AUD within a Canadian context is lacking. Risk factors for AUD among CAF Members and Veterans with MST have also yet to be identified. The current thesis used the 2018 CAF … Lire la suite
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2024 — Exploration of the antimicrobial capabilities of Pantoea: Insights into a metabolically diverse genusRésumé
The rise of antimicrobial resistance has once again renewed interest in the development of novel antimicrobials for the treatment of resistant pathogens. The genus of bacteria Pantoea, a member of the Erwiniaceae, has been shown to produce several unique antimicrobials with diverse targets. Chapter one gives a review of the known antimicrobials produced by Pantoea including their discovery, genetic origins, biosynthetic pathways, structures, mechanisms of action and resistance, distributions, and insights into their evolutionary histories. Chapter two describes a replica-plating technique that was developed to quickly and easily screen transposon mutant libraries to discover the biosynthetic gene clusters responsible for … Lire la suite
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2024 — Making (in)visible: Marginality, neurodiversity and COVID-19 in urban SaskatchewanRésumé
People with disabilities have been coined invisible citizens during the COVID-19 pandemic. This research responds to the ways people with disabilities and other intersecting marginalities were made invisible during COVID-19 in urban Saskatchewan. Using arts-based participatory this research asks, “what are the practices that worked to invisibilize people with disabilities and intersecting marginalities during the COVID-19 pandemic?” To explore this question the project worked with three community-based organizations and individuals with disabilities in Regina Saskatchewan to unpack stories and truths while co-designing a creative outcome focused on lived experiences of COVID-19. Analysis explores the broader contexts in which people with … Lire la suite
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2024 — Development of scintillator-based components for the photosensor system for the Intermediate Water Cherenkov Detector of the Hyper-K experiment and for the time of flight system of the Water Cherenkov Test ExperimentRésumé
The existence of the neutrino flavour oscillation phenomenon carries a potential CP-violation phase, 𝛿CP, that might be the answer to the matter-antimatter asymmetry question in the Universe. With a new far detector and upgraded components of the successful Tokai-to- Kamioka (T2K) experiment, the long-baseline aspect of the Hyper-Kamiokande (Hyper-K) experiment will utilize an upgraded neutrino beam from the Japan Proton Accelerator Research Complex (J-PARC). The measurement of 𝛿CP from 𝜈𝜇 and ¯ 𝜈𝜇 disappearance modes will be dominated by systematic uncertainties. To reduce these uncertainties to discovery-level precision, an Intermediate Water Cherenkov Detector (IWCD) is introduced at a distance of … Lire la suite
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2024 — Investigating population structure and resource use diversity in Lake Huron Lake (Coregonus clupeaformis) and Round (Prosopium cylindraceum) Whitefish using compound specific stable isotopes analysisRésumé
Aquatic thermal pollution from electricity generation, via once-through cooling systems, poses a potential threat to freshwater ecosystems. Research has shown that elevated temperatures can have adverse effects on whitefish reproduction and development, potentially leading to population decline. Despite these risks, there is limited understanding of whitefish population structure in areas affected by once-through cooling in Lake Huron. Population structure assessments are typically conducted with genetic methodologies but population mixing in Lake Huron complicates detection. In addition, genetic methodologies are not able to capture recent ecological aspects of population structure, necessitating the use of additional marker types. The stable isotopes of … Lire la suite
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2024 — Measurement of the pion exclusive electro-production cross-section in the E12-19-006 experiment in Hall-C at Jefferson LabRésumé
One of the most effective methods for exploring the transition from hadronic de- grees of freedom to quark-gluon degrees of freedom in Quantum Chromodynamics (QCD) is through the investigation of \exclusive" pion and kaon electro-production reactions at various Q2 and -t values. The E12-19-006 experiment is conducted within the confines of experimental Hall C at the Thomas Jefferson National Accel- erator Facility, USA, for such studies. The primary aim of the experiment is to first enhance our comprehension of the pion electro-production cross-section and its form factor at Q2 = 0.38 and 0.42 GeV2. This is the first run period … Lire la suite
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2024 — An exploration of conceptual similarity in multiple target visual searchRésumé
Visual search studies generally suggest that multiple target visual search is more difficult and less efficient than traditional single target search, with costs to both RT and accuracy. Typically, these studies use dual target trials and abstract stimuli. A study by Laderoute (2021) using varying target set sizes and naturalistic stimuli found better performance for many-target search, with per-item RTs that decreased as target set size increased. Interestingly, increasing the perceptual similarity of the targets had no effect on search performance. However, in that study, regardless of the perceptual similarity condition, all targets within a trial were always the same … Lire la suite
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2024 — The thief and the beauty queenRésumé
The Thief and the Beauty Queen is a middle-grade novel told from the perspectives of two eleven-year-olds, Landon and Cora—one known for theft and the other for social media fame—who must collaborate to mend their tarnished reputations. Aimed at readers aged 8-12, the story reflects the modern pressures young people face in balancing their online personas with their real-life identities. Drawing from my nineteen years of teaching experience, I sought to create a narrative that emphasizes authenticity and accountability, illustrating that we are not defined by others' perceptions. The novel appeals to readers by incorporating two alternating narrative voices. The … Lire la suite
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2024 — Exploring the Twitch.tv phenomenon: Secondary students' lived digital citizenship experiences on Twitch.tvRésumé
This study explored the lived experiences of secondary students in Saskatchewan on the popular live-streaming platform Twitch.tv (hereafter, Twitch) in order to understand their perceptions of digital citizenship in such interactive online spaces. Hermeneutic phenomenology was used to analyze interviews with eight participants who spoke about their experiences on Twitch. Analysis of the interview data generated two major themes. The first major theme, digital engagement, was bisected into two subthemes: using without the manual and safety in anonymity. The second major theme, digital awareness, was also parted into two subthemes: (digital) citizenship and digital literacy. The interview data showed that … Lire la suite
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2024 — Incorporating game theory with soft sets for better decision makingRésumé
Solving uncertainty is a challenge for decision-making. Soft set theory aims to aid complex decision-making when multiple uncertainty variables are involved. To solve classification problems with the existence of uncertainty, we adopted three-way classification instead of binary classification. It introduces a boundary region to handle scenarios in which a number of objects cannot be categorized as either positive or negative with a high degree of certainty. The three-way classification problem involves multiple experts. Each expert may produce a different three-way classification outcome based on their available information and expertise. We introduced a gametheoretic soft set model to address the fusion … Lire la suite
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2024 — Progressive partition-based granular computing and complexity measuresRésumé
Granular computing has received much interest over the past few decades due to its effectiveness and practicality in managing complexity. While it is intuitively believed that complexities in granular computing are linked to granularities, there do not exist any studies to show they have a direct connection. This suggests the need to investigate complexity from a different perspective. Simon’s concept of nearly decomposable systems, which describes complexity from a hierarchical perspective, aligns closely with the hierarchical nature of granular structures. Thus, granular structures can provide a foundation for exploring complexities in granular computing. This study investigates the complexity of the … Lire la suite
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2024 — Promote the development of novel post-combustion CO2 capture technology towards practical and feasible: Design and assessment of solvents and process configurationsRésumé
This thesis focuses on developing novel CO2 capture processes that encompasses both CO2 absorption and solvent regeneration process. The work adhered to the guiding principle “Simplify complex system engineering towards practicality and feasibility”. This research aims not only to explore the enhancement of the state of art technologies in the CO2 capture industry but also to improve the potential for practical operations in pilot and industrial scale, ensuring it meets the general level of practical industrial application. Several experimental and simulation tasks have been accomplished in labs, including solvent screening tests, process configuration design, simulation studies, and bench-scale pilot plant … Lire la suite
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2024 — Investigating the role of water and nanoparticles in the performance of CO2 and ethane-based cyclic solvent injection process for heavy oil recoveryRésumé
Cyclic solvent injection (CSI) process is a promising method for enhancing heavy oil recovery in thin or deep heavy oil reservoirs. Foamy oil flow is a major phenomenon of the CSI process, but the impact of foam stabilizers like nanoparticle and water on its performance has not been well understood. Therefore, an in-depth understanding of waterflooding and nanoparticle affecting CSI performance is a crucial step toward further enhancing oil recovery. In addition, most studies only focus on one method. In fact, in order to develop an oil reservoir cost-effectively and efficiently, a variety of methods have to be applied in … Lire la suite
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2024 — Beta-delayed proton emission of magnesium-20 and the RCMP silicon detector arrayRésumé
In 2011, experiment e09024 was performed in National Superconducting Cyclotron Laboratory(NSCl) located at Michigan State University from Michigan state. The goal was to investigate delayed particle emission for isotopes near proton drip line. The main secondary beam was ²²Si while other exotic beam such as ²⁰Mg,²²Al,²³Si was also produced. The delayed particle emission from ²⁰Mg is of particular interest in this thesis and has been studied in details. In 2018, Dr.Gwen Grinyer's group at University of Regina started constructing a Silicon Detector Array named Regina Cube for Multiple Particle(RCMP) used for studying delayed particles at proton drop line with high … Lire la suite
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2024 — Numerical simulation of geothermal energy production in the Estevan area using water and CO2 as working fluidsRésumé
Geothermal energy is a promising and clean renewable resource that is widely accessible around the world (Avci, A.C., et al., 2020). The city of Estevan is proven to possess some geothermal qualities which can be utilized for heating and electrical power generation (Jacek Majorowicz et al., 2021). Water is the most common working fluid to extract geothermal energy; However, water-based geothermal systems may cause issues, such as water loss and induced seismicity. Recently, CO2 has attracted more interest as an alternative injectant to explore geothermal energy because of its high mobility, thermal properties and the additional benefits of CO2 sequestration. … Lire la suite
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2024 — The quantile analysis of gene expression trajectory and quality controlRésumé
In Chapter 2 of the thesis, Taguchi’s loss function in the multivariate case is reviewed and a straightforward and practical definition for the cost coefficient matrix is proposed. In order for the quality control process cost more realistic, the expected modified Taguchi’s loss function is applied on Hotelling’s T2 control chart based on a modified economic statistical design, and variable sampling interval (VSI) scheme is adopted. To obtain optimal design parameters, artificial bee colony (ABC) algorithm is utilized. By comparing our approach with previous routine design, it is concluded that redefining the cost factor makes the control system more sensitive … Lire la suite
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2024 — Victim blaming in the courtroom: The influence of lawyer gender and style on juror decision-makingRésumé
Despite the present Canadian laws meant to protect victims of sexual assault during the trial process, it is common for defence lawyers to employ stereotypes against the victim (a process known as “whacking”; Tanovich, 2015). It is unclear whether the gender of the defence lawyer is a determining factor in the influence of such stereotypes. Only a limited number of studies have examined the effects of lawyer gender, which yielded conflicting findings (Levi et al., 2022; Villemur & Hyde, 1983). Moreover, the previous studies did not explore whether the lawyers’ cross-examination style or the juror’s level of sexism factor into … Lire la suite
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2024 — Machine Learning on simulated forward calorimeter upgrade for JEFRésumé
This thesis centers around using Machine Learning to distinguish true photons from hadronic split-offs detected by the JEF and GlueX experiments. The FCAL is an electromagnetic detector undergoing an upgrade to its inner region for improving neutral particle identification for the JEF project. Search for exotic η and η′ decays are the focal point JEF experiment as they test the limits of the current Standard Model and provide unique opportunities to search for Dark Matter candidates. The aim of this project is to develop of a shower classification scheme that can confidently separate between true photons and split-offs showers in … Lire la suite
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2024 — Suspending echoesRésumé
This critical engagement paper outlines the conceptual and technical details and theoretical support for my Master of Fine Arts exhibition project titled Suspending Echoes, presented at the Fifth Parallel Gallery from August 1 to August 15, 2024. Suspending Echoes is an interactive and immersive installation through which I attempt to represent my perception of self as a fluid entity, continuously shaped and influenced by currents, created by interactions with my surrounding environment and people. The installation creates a dynamic environment where the audience's presence and movements contribute to their overall experience. I aim to evoke empathy and self-reflection through this … Lire la suite
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2024 — Women in social work leadership in Saskatchewan: The myth of shattering the glass ceilingRésumé
The purpose of this qualitative research was to enhance knowledge about the experiences of women in the 1% of marginalized leadership representation statistics in Saskatchewan in the field of social work. Through an intersectional feminist framework, based on the interrelatedness of our social identities, both privileged and oppressed; narrative interviews were completed with five women. The participants identified as belonging to the LGBTQ2S+, BIPOC, disability and/or trans communities. Within the social work leadership sector, the women have held upper management, director, and CEO positions. Data was analyzed through a case-by-case analysis and a thematic analysis. Several key findings emerged from … Lire la suite
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2024 — Field notes for returning home: Creative-critical conversations on the home place in Kroetsch’s completed field notesRésumé
This thesis utilizes a creative-critical approach to explore the concept of returning home as a place-based practice through the reading of three early poems from Robert Kroetsch’s Completed Field Notes. Each chapter begins with a personal, embodied experience related to the home place where I grew up and a Kroetsch poem grounds each chapter and acts as a field guide through which to view the experience of home. The selected Kroetsch poems, “Stone Hammer Poem”, “The Ledger”, and “Seed Catalogue”, each demonstrate a tension common in Kroetsch’s work: finality and simultaneity, product and process, and history and archaeology. The result … Lire la suite
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2024 — Geochemical analyses of amber associated with dinosaur bonebeds in central North AmericaRésumé
For a long time, amber has been praised for its ability to preserve organic inclusions in spectacular detail. More recently amber has been analysed from a geochemical point of view, to gain a better understanding of the environments in which this fossilized tree resin was produced. Due to lack of fossils and detail in known paleo-environments three meters below the Cretaceous-Paleogene (K-Pg) boundary, amber geochemistry helps to fill in a gap of the fossil record. This study consists of the analysis of carbon and hydrogen stable isotopes from amber in bone beds, as well as Fourier Transform Infrared Spectroscopy (FTIR) … Lire la suite
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2024 — Image-based direct geo-referencing of farm boundaries for autonomous farming vehicles using computer visionRésumé
Agriculture is undergoing a transformative technological revolution that has led to significant improvements in automation and efficiency. Although contemporary satellite imagery is limited in resolution and update frequency, it presents inherent challenges in the determination of farm boundaries. A novel image-based methodology has been developed in response to these limitations, which is poised to redefine precision agriculture by enabling accurate geo-referencing of agricultural boundaries within the context of autonomous vehicles. Through the integration of onboard cameras and GPS data into the very fabric of autonomous farming vehicles, this approach allows for the detection and geo-referencing of farm boundaries at an … Lire la suite
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2024 — Spinel: a framework for counting wheat spikes and kernels using UAV and ground-based imaging in breeding fieldsRésumé
Quantifying wheat spikes and kernels is crucial for evaluating the grain yield potential of diverse breeding lines. It enables breeders to measure grain yield and select superior breeding lines to improve crop productivity. Traditional methods for assessing these traits are labour-intensive, error-prone, and manual. Despite the widespread use of deep learning (DL) techniques in recent studies, there remains a gap in applying these methods to provide practical, quantified analyses for breeding field applications. This thesis introduces SPINEL (SPike and kerNEL), a comprehensive framework that combines unmanned aerial vehicle (UAV)-captured multispectral imaging and fieldcaptured RGB camera imaging for advanced phenotyping. The … Lire la suite
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2024 — Advanced CNN architecture integrating machine learning algorithms for precise Alzheimer's disease classificationRésumé
Alzheimer's disease (AD) is a degenerative neurological disorder that affects millions of individuals worldwide and is very difficult to detect and treat in its early stages. This thesis presents a novel architecture for a convolutional neural network (CNN) designed exclusively to classify Alzheimer's disease using functional magnetic resonance imaging (fMRI) data. This work improves the accuracy and reliability of early Alzheimer's identification by using state-of-the-art deep learning techniques to the Alzheimer's Disease Neuroimaging Initiative (ADNI) dataset. The basis of this research is the ADNI dataset, a vast collection of brain imaging and associated data from people with different degrees of … Lire la suite
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2024 — The Macdonald groupRésumé
Given α ∈ Z, the Macdonald group G(α) is defined by G(α) = ⟨ A,B | A[A,B] = Aα, B[B,A] = Bα ⟩. It is known that G(α) is finite if and only if α ̸= 1, in which case the prime factors of |G(α)| are those of α − 1. It is also known that G(α) is nilpotent in certain cases. We show that G(α) is always nilpotent, so that for α ̸= 1, G(α) is the direct product of its Sylow subgroups. In the first third of the thesis, we determine the order, upper and lower central series, … Lire la suite
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2024 — Preferences and experiences of interdisciplinary communication across hospital unit types: A survey of three health professions in a Regina, Saskatchewan hospitalRésumé
In the literature, interdisciplinary communication has been linked to high quality patient care, reduced medical error and improved patient and care provider satisfaction. Information sharing, role clarity, and shared goal setting amongst care providers are also attributed with interdisciplinary communication. The Accountable Care Unit (ACU) is an innovative, microsystem-based approach to inpatient hospital care that incorporates distinct features facilitating interdisciplinary collaboration and communication including: geographic co-location of a physicians’ patients and Structured Interdisciplinary Bedside Rounds (SIBR). During SIBR, care providers meet at the patient’s bedside and use a standardized communication protocol to provide and receive information. Traditional hospital wards, on … Lire la suite
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2024 — The sustainability of Saskatchewan municipalitiesRésumé
Although the municipal government is considered closest to the people, municipalities are not referenced in the Canadian constitution. Recognizing this gap, soon after joining the Confederation of Canada in 1905, Saskatchewan enacted a municipal act to regulate its rural and urban sectors. The province sought to ensure that citizens in urban municipalities were provided with municipal services such as water and sewage treatment, medical services, and recreation and that rural municipalities served agricultural land with roads, bridges, and other necessary infrastructure. The critical difference between urban and rural municipalities lies in population density, governance structure, and the types of services … Lire la suite
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2024 — Participation in 12 weeks of the Saskatchewan Health Authority’s Diabetes Wellness Series: Effects on appetite hormone response to a mixed meal tolerance testRésumé
Food intake (FI) dysregulation in type 2 diabetes (T2D) may be due to impaired tonic satiety signals (e.g., insulin, leptin) and episodic FI signals (e.g., glucose, acyl-ghrelin [a-ghrelin; appetite-stimulating], active glucagon-like peptide-1 [aGLP-1; appetite-inhibiting]), promoting caloric overconsumption. Research has shown that regular physical activity is associated with more sensitive appetite control. The present thesis aimed to: (1) investigate the acute responsiveness of FI regulatory signals (glucose, insulin, a-ghrelin, aGLP-1) and perception of appetite to a 120-minute mixed meal tolerance test (MMTT) in individuals with T2D, and (2) assess the impact of participation in 12 weeks of the Saskatchewan Health Authority’s … Lire la suite
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2024 — The role of modular construction and BIM technologies in sustainable construction and demolition waste managementRésumé
Construction and demolition activities significantly contribute to global waste generation, necessitating sustainable measures. This thesis explores advanced C&DW management through Building Information Modeling (BIM) and modular construction techniques. In the initial phase of the study, a comprehensive text-mining analysis of 493 scholarly publications (2009-2024) reveals key themes and temporal trends. The cooccurrence analysis identified three distinct clusters centered on C&DW management, highlighting strong correlations between "sustainability" (Links=41), "BIM" (Links=46), and "C&DW" (Links=46). Thematic development and evolution analysis indicated that during the third period (2018-2021), transversal themes included Material Passport (OCC=92) and Prefabrication (OCC=482). In the fourth period (2022-2024), transversal themes … Lire la suite
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2024 — Role of erythritol catabolism by Rhizobium johnstonii in the rhizospheres of lentil, pea, and vetchRésumé
Legumes are known for their high protein content and ability to improve soil fertility. They form a symbiotic relationship with rhizobia through exchange of signaling molecules and plant exudates, such as carbon sources, which, in turn, enable biological nitrogen fixation through the formation of nodules. In the rhizosphere, the environment around the roots, bacteria compete against each other for root colonization and nodulation. Rhizobium johnstonii is capable of catabolizing erythritol, a known pea root exudate. Previous deletion mutation of the catabolic genes (Yost et al., 2006) created strains unable or with reduced ability to grow on media containing erythritol as … Lire la suite
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2024 — Beam asymmetry in the reaction channel γp→ηΔ + at Glue XRésumé
Photoproduction mechanisms studied in the GlueX experiment allows the mapping of light mesons in unprecedented detail with particular interest in exotic meson candidates. This is achieved by impinging an 8.2-8.8 GeV linearly polarized photon beam on a liquid hydrogen target. The measurement of beam asymmetry Σ will help constrain quasi-particle t-channel exchange processes using Regge theory. Understanding the photoproduction exchange mechanisms is a crucial ingredient in establishing hybrid and exotic photoproduced light meson states. Σ is extracted from the azimuthal angular distribution between the meson production plane and the polarized photon beam. In particular, we will report results on the … Lire la suite
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2024 — Optimize performance of second life batteries in an electric vehicle charging networkRésumé
The ever-increasing concerns of climate change has led to an exponential growth of electric vehicles (EVs) as a way to decarbonize the transportation sector. Although this solution appears promising, this method to reduce transportation emissions does comes with its challenges. Two main criticisms of EVs are the increased electricity demand due to EV charging participation and the accumulation of retired EV batteries. This study aims to provide a solution to both of these concerns. The EV battery can only sustain the vehicle's needs for a limited time. Once the battery reaches a state of health (SOH) that can no longer … Lire la suite
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2024 — Application of data-driven methods in water resources engineering – case studiesRésumé
Water resources engineering stands at the forefront of sustainable water management, facing challenges that necessitate innovative solutions. This thesis explores the integration of data-driven methods into the field, with a dual focus on predicting Maximum Scour Depth around Piers under Ice-covered Conditions (MSDI) and enhancing Water Quality Index (WQI) predictions. In addressing the first objective, MSDI, the study utilizes three data-driven methods—M5, PSO, and GEP—to predict scour depth around piers under ice-covered conditions. A meticulous dataset preparation process precedes model development, followed by rigorous evaluation and sensitivity analysis. The proposed solution framework not only advances academic understanding but also provides … Lire la suite
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2024 — Enriched model categories and the Dold-Kan correspondenceRésumé
The work we present in this thesis is an application of the monoidal properties of the Dold–Kan correspondence and is constituted of two main parts. In the first one, we observe that by a theorem of Christensen and Hovey, the category of nonnegatively graded chain complexes of left R-modules has a model structure, called the Hurewicz model structure, where the weak equivalences are the chain homotopy equivalences. Hence, the Dold–Kan correspondence induces a model structure on the category of simplicial left R-modules and some properties, notably it is monoidal. In the second part, we observe that changing the enrichment of … Lire la suite
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2024 — Modeling of birth and death oscillations in provinces of CanadaRésumé
We discuss several statistical properties of the new proposed Log-Logistic Erlang (LLogE) distribution. Additionally we analyse birth, death oscillation of Canadian provinces in depth as well as the correlation between birth and death and those with temperature that has been collected from center of population of each provinces. While the focus of this study is on Canada, temperature may have a global influence on fertility. Even if there is no consensus how seasonality of birth phenomenon modelled, yet environmental factors specifically temperature, plays a role in explaining the seasonality observed in birth in many countries over many years. There are … Lire la suite
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2024 — Musings on matchings, matrices, and multiplicitiesRésumé
The Parter-Wiener Theorem is a celebrated contribution to the inverse eigenvalue problem for trees due to its determination of vertices whose removal affects multiplicities of eigenvalues in a non-intuitive manner. For a more general graph, G, that contains cycles, the construction of the weighted matching polynomial and its many properties are derived. These properties are shown to determine a relationship between the multiplicities of the roots of the weighted matching polynomial and the graph operation of vertex deletion in G, which is the operation at the core of the Parter-Wiener Theorem. Solutions for locating vertices whose removal increases the multiplicity … Lire la suite
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2024 — Development of task specific ionic liquids incorporated porous sorbents for post-combustion CO2 captureRésumé
Amino functionalized ionic liquids (AAILs), also known as task-specific ionic liquids (TSILs), have demonstrated CO2 capture ability similar to amines while maintaining ionic liquid properties such as low regeneration energy, volatility, and thermal stability. However, high synthesis costs and viscosity prevent their broad usage in CO2 capture technologies. Recently discovered porous materials like metal-organic frameworks (MOFs) and ordered mesoporous silica have stimulated scientists’ interest in CO2 capture applications. However, these materials have limited CO2 absorption and poor CO2/N2 selectivity, particularly at post-combustion CO2 capture conditions (0.15 bar). Immobilizing TSILs in solid pores to boost CO2 capture is an innovative way … Lire la suite
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2024 — Develop innovative methodology to optimally fill in missing values and predict progression on multiple sclerosisRésumé
Applying Machine Learning (ML) to predict and track Multiple Sclerosis (MS) progression is a significant advancement in medical research, with the potential to enhance patient outcomes. Accurate MS prediction enables personalized treatment, timely interventions, and improved quality of life by slowing disease progression and preventing complications. This research aims to deepen our understanding of MS by developing ML models and comprehensive risk assessments to support early prognosis, guide treatment strategies, and reduce disease impact. A major challenge in medical research, especially in predicting MS progression, is effectively managing missing data in MS datasets. This study introduces an innovative sequential Multi-Imputation … Lire la suite
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2024 — Characterization of CO2 separation from post-combustion flue gas mixtures using nanocomposite membrane: Molecular dynamics analysisRésumé
Dependency on fossil fuels to fulfill the global energy requirement has led to an increase in the concentration of greenhouse gases in the atmosphere particularly carbon dioxide (CO2) from industrial pollution. This has resulted in environmental impact, climate changes, etc. Hence, carbon capture became the focus of industries and academics to reduce the effects of greenhouse gases. However, capturing those free-flowing CO2, especially from the post-combustion flue gas has been a challenge. On the contrary, membrane-based carbon capture and storage (CCS) became a great option due to its retrofitting capability, sustainability, and reusability. Still, considerable research is required to properly … Lire la suite
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2024 — Carbon dioxide and ethane solubility in bis tri (fluromethylsulfonyl) imide-based ionic liquids: Selectivity measurements and modellingRésumé
The urgent need to address carbon dioxide (CO2) emissions, a critical factor in escalating greenhouse gas levels and global warming, underscores the significance of effective capture and reduction methods. This research investigates the absorption of Carbon Dioxide and Ethane in three ionic liquids: 1-Decyl-3-MethylimidazoliumBis (Trifluromethylsulfonyl Imide) [IL1], 1-Hexadecyl-3-Methyl imidazoliumBis (Trifluromethylsulfonyl Imide) [IL2] and Triethytetradecyl Ammonium Bis (Trifluromethylsulfonyl Imide) [IL3]. Solubility measurements of CO2 were conducted from 303.15K to 343.15K and pressures up to 1.5 MPa, utilizing a gravimetric microbalance. The acquired solubility values were correlated with the Peng Robinson (PR) equation of state (EoS) using three mixing rules: Single - … Lire la suite
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2024 — Structural analysis and fatigue prediction of harrow tines used in Canadian prairiesRésumé
Canadian prairies are renowned for their agricultural contribution to the global food market, where harrow tine is a critical component of agricultural equipment used for soil preparation and weed control before crop cultivation. Unfortunately, during operation, these tines are exposed to repetitive cyclic loading, which eventually causes fatigue failure. Commercially available three different harrow tines named 5-1895, 5-2709, 5-2776 undergo an experimental fatigue evaluation and are validated through a numerical approach using Finite Element Analysis (FEA). After that, fatigue life estimation for different deflections under different circumstances in the real field was determined where 5-2676 showed ground-breaking life compared with … Lire la suite
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2024 — Assessing construction and demolition waste generation rates using satellite imageryRésumé
Municipal solid waste management has seen a surge in the use of satellite imagery in decision-making processes, yet its application to analyze quantitative variations in construction and demolition (C&D) waste remains underexplored. Especially the COVID- 19 pandemic disrupted conventional municipal solid waste (MSW) management practices and affected waste generation rates. While MSW streams have been extensively studied and reported, the impact on construction and demolition (C&D) waste remains overlooked. As such, the first part of the study develops an innovative analytical framework utilizing satellite imagery to quantify C&D waste disposal rates during COVID-19 restrictions in a mid-sized Canadian city. Supervised … Lire la suite
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2024 — Alcohol and social work: Context and meaningsRésumé
There is little research available about alcohol use among social workers in Canada. This mixedmethodology study seeks to address gaps in research regarding alcohol use among social workers in Saskatchewan. Social workers in Saskatchewan were invited to participate in an online survey that collected quantitative data including demographic information, alcohol consumption, adverse childhood experiences, and professional quality of life. Qualitative data was collected using semi-structured interviews to capture the meanings social workers attribute to their experiences of alcohol use. The survey found that the overall alcohol consumption of Saskatchewan social workers may be lower than that of the general Canadian … Lire la suite