Liste complète
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2025 — La perception des enseignant.es sur l’intégration des récits de la diversité dans les cours de français en milieu minoritaire pour promouvoir l’équité, la diversité et l’inclusionRésumé
Ce mémoire vise à souligner le rôle important des enseignant.es en tant qu’agent.es d’équité et d’inclusion dans les cours de français en milieu minoritaire. Les récits de la diversité concourent au bien-être des élèves et soutiennent leur construction identitaire positive et l’apprentissage de l’altérité. Ils favorisent aussi l’apprentissage du mieux vivre ensemble, la communication interculturelle et la justice sociale. Toutefois, ils sont peu utilisés dans les salles de classe, car les enseignant.es rencontrent divers obstacles matériels, relationnels ou ne sont pas formé.es à la sélection de livres et de récits culturellement sensibles et pertinents. Cette recherche porte sur la pratique … Lire la suite
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2020 — Effects of Creatine and Caffeine Supplementation During Resistance Training in Trained Young AdultsRésumé
The purpose of the study was to determine the separate and combined effects of creatine and caffeine supplementation during resistance training on body composition, muscle thickness and muscle performance (strength, endurance) in trained young adults. Twenty-eight participants were randomized to supplement with Creatine and Caffeine (CR-CAF; n = 9; 22 ± 4 yrs; 0.1 g·kg-1·d-1 of creatine monohydrate powder + 3 mg·kg-1·d-1 of caffeine anhydrous micronized powder); Creatine (CR; n = 7; 22 ± 4 yrs, 0.1 g·kg-1·d-1 of creatine + 3 mg·kg-1·d-1 of caffeine placebo [micronized cellulose powder]), Caffeine (CAF; n = 6; 19 ± 1 yrs, 3 mg·kg-1·d-1 … Lire la suite
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2022 — Machine learning enabled wireless sensor network for partial discharge detectionRésumé
Partial Discharge (PD) is one of the leading causes of failure in high voltage electrical equipment, making it an important metric for predictive and preventative maintenance. Early detection of PD and corresponding maintenance can prevent catastrophic failures and improve safety and reliability. PD occurs when insulation between conductors is partially bridged causing electrical stress on the surface of the insulation. The PD phenomenon typically results in pulses of duration 1 μs or less. PD can be monitored using Off-line and On-line methods. While on-line is a more attractive option as it does not require system downtime. Some On-line methods include … Lire la suite
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2020 — Cameron-Liebler Sets for 2-Transitive GroupsRésumé
This research was conducted on 2-transitive groups whose minimal normal subgroup is abelian. Suppose G is such a group and ΓG is its derangement graph. Any maximum coclique S of ΓG has a characteristic vector xS. Each xS is a boolean vector contained in a particular module, which is called the permutation module MP. This module has a dimension of 1 + (n − 1)2, where n = deg(G), and it is spanned by {xij | i,j∈{1,...,n}}, where each xij is the characteristic vector of Sij, the set of permutations that map i to j. Apart from the xij, which … Lire la suite
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2013 — Development and Evaluation of a Hybrid Membrane Bioreactor for Greywater ReclamationRésumé
The development and evaluation of novel treatment and sanitation devices are necessary for the advancement of wastewater management practices. Considering future water demands and the limitation of current supplies, water security will likely become a central issue of the 21st century. To address this concern, a greywater reclamation system for non-potable water applications was developed and evaluated during this research. The reclamation system consisted primarily of a hybrid membrane bioreactor (HMBR), a biological treatment system containing both attached and suspended growth processes and membrane separation. A 10 month pilot study using synthetic and real greywater was conducted at the University … Lire la suite
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2020 — Examination of the Fouling and Treatment Performance of a Hybrid Membrane Bioreactor for Decentralized Greywater ReclamationRésumé
An examination of the fouling behaviour and treatment performance of a hybrid membrane bioreactor (HMBR) was made to assess its viability for decentralized greywater reclamation. In comparison to a conventional membrane bioreactor (MBR), the HMBR was able to operate 1{11 days (4{42%) longer between cleaning cycles. These reductions in the rate of membrane fouling could not be attributed to any scouring e ects caused by the biocarriers, since they were prevented from contacting the membranes throughout operation. An examination of the biofoulants within each bioreactor indicated that the ratio of proteins to polysaccharides was signi cantly lower in the extracellular … Lire la suite
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2023 — Examining native Saskatchewan bumble bees health using species occurrence data, pathogen incidence and gut microbial associationsRésumé
Bees are important pollinators, though, recent evidence suggests some species of bumble bees (Hymenoptera, Apidae, Bombini, Bombus Latreille) are declining in parts of their ranges due to a combination of drivers such as climate change, pesticide use, habitat loss, competition for resources and pathogens acting upon the bees at once. A relatively new and important area of gut microbial research, the fungal and bacterial gut community members, could offer insight on why some species of bumble bees are declining while others remain stable. In this thesis, I use a combination of field and molecular methods to investigate aspects of bumble … Lire la suite
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2020 — The Role of Anxiety Sensitivity and Disgust on Facets of Covid-19-Related AnxietyRésumé
The COVID-19 pandemic has created a climate of fear, uncertainty, and panic as people cope with the spread and threat of a highly infectious disease. The influx of COVID-19-specific anxiety in the general population is of significant concern. Proponents of the behavioural immune system (BIS) argue that reactions to pandemics, such as excessive COVID-19-related anxiety, are shaped by psychological factors that help protect against infectious disease. Anxiety sensitivity specific to physical concerns (AS-physical concerns; i.e., the fear of perceived somatic signals of potential bodily harm) and disgust proneness (i.e., tendency to experience disgust frequently and intensely) are proposed to be … Lire la suite
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2018 — Hydrochemical Assessment and Modelling of Groundwater Quality of an Urban Aquifer Near A Sanitary LandfillRésumé
Groundwater supply is crucial to both anthropogenic and industrial activities in Canada. In Saskatchewan, around 63 percent of municipalities rely on groundwater as their primary water supplies. Recent data suggested groundwater quality in Condie aquifer might have been compromised due to the operations of an unlined municipal landfill and the industrial area upstream. The complex geographical conditions, hydrochemistry reactions in subsurface environment, missing data and inconsistent sampling has made the assessment of groundwater difficult. Two studies on the groundwater quality near the Regina landfill are conducted. In the first study, groundwater quality is evaluated with respect to its ions correlations, … Lire la suite
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2016 — Saskatchewan Electrical Power Systems Planning under Stochastic Conditions and Federal Climate Change RegulationsRésumé
Greenhouse gas (GHG) emissions from industrial activities are the key drivers of climate change impacts in many regions around the world. In 2012, Environment Canada and Climate Change published its first GHG emissions performance standards, the Reduction of Carbon Dioxide Emissions from Coal-fired Generation of Electricity Regulations, to set up the performance standards for coal-fired generation units to reduce GHG emissions in Canada. Saskatchewan is concerned about the impact of the published regulations on future electricity generation system planning and GHG. Specifically, the regulations result in a shift from existing coal-fired generation units towards other high efficient power generation units … Lire la suite
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2013 — Can Meaning Associated with Perceptual Grouping Modulate Attention?Résumé
In an environment rich with information, performance on a task depends on the ability to select only the relevant pieces of information for achieving a current goal. Cognitive psychologists propose that selective attention helps to segregate the relevant information from the irrelevant information. A combination of bottom-up and top-down factors jointly influences the settings of the attentional filter (Spalek, Falcon & Di Lollo, 2006) such that only task-relevant information is selected for further processing. However, biologically- and socially-important stimuli like affective faces are proposed to influence allocation of attention (Vuilleumier & Schwartz, 2001). Task-irrelevant emotional faces are proposed to capture … Lire la suite
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2023 — Efficient estimation for time series modelsRésumé
In this dissertation, we discuss the pretest, improved pretest and shrinkage estimators for some time series regression models, such as ARIMA, GARMA, and GARFIMA. We study the asymptotic biases and risks of these estimators and compare their relative performance with respect to the maximum likelihood estimator (MLE) analytically and numerically using Monte Carlo experiments and real data examples. In Chapter 2, we consider the James-Stein shrinkage estimation procedure for the ARIMA regression model when some prior/auxilliary information is available about insignificant covariates in the model. The asymptotic properties of the shrinkage estimators, under local alternatives, are implemented including the derivations … Lire la suite
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2013 — The Use of Object-Based Classification of High Resolution Panchromatic Satellite Imagery for the Inventory of Shelterbelts in the Province of SaskatchewanRésumé
The Prairie Shelterbelt Program of Agriculture and Agri-Food Canada, has produced many benefits for farmers and the prairie landscape: reducing soil erosion, protecting crops, controlling snow drifting over highways/roads and providing wildlife habitat. Due to growing concerns about rising levels of carbon dioxide in the atmosphere, the ability of shelterbelts to sequester carbon dioxide may also be of importance. Although the Prairie Shelterbelt Program has been distributing tree and shrub seedlings for more than 100 years, and records of the numbers of trees shipped have been kept, an inventory of the number of trees that have been successfully planted and … Lire la suite
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2012 — Experimental Investigation of Viscosity Ratio Effect on Displacement Performance of Polymer Systems During Heavy Oil RecoveryRésumé
Heavy oil production during secondary recovery is often plagued by high producing water/oil ratios; this is a direct result of the unfavourable viscosity ratio that leads to viscous instability at the displacement front between the injected water and the more viscous oil. Polymer flooding has proven to be an exceptionally efficient enhanced oil recovery (EOR) technique that increases the stability of the displacing front, accelerating the pore displacement efficiency and improving the vertical and areal macroscale sweep efficiencies. This is especially important in heavy oil reservoirs, where recovery factors tend to be less than 10 % of original-oil-in-place (OOIP) The … Lire la suite
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2023 — Saturated–Unsaturated behaviour of compacted claysRésumé
Clayey soils are often compacted for geotechnical and geo-environmental construction such as hydraulic dams, road embankments, tailings containment facilities, and municipal landfills. Post construction, these earthworks are exposed to variations in seasonal weather and extreme climatic events (drought, flood, and freezing), contaminations (deicing salts, ion-rich slurries, and toxic leachates), and applied stresses (self-weight, vehicular traffic, and heavy equipment), thereby affecting the integrity of civil infrastructures. The geotechnical behavior (flow through, volume change, and shear strength) is governed by soil composition and compaction, soil-water-electrolyte mechanisms, soil-atmosphere interactions, and field conditions. This research focused on developing a clear understanding of saturated–unsaturated behavior … Lire la suite
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2025 — New probabilistic approaches for detecting and evaluating concept drift in data streamsRésumé
In modern applications like online shopping, financial forecasting, and real-time fraud detection, data distributions frequently shift, causing predictive models trained on historical data to underperform. This phenomenon, known as Concept Drift (CD), presents a major challenge in adaptive learning environments, necessitating ongoing monitoring and adjustment to accommodate evolving data streams. Active drift detection methods, which track changes in data distribution or model performance, offer a targeted solution by prompting adaptations only when significant shifts are detected. However, existing active methods face challenges: distribution-based approaches may miss subtle drifts or respond to non-critical changes (virtual drift), while performance-based methods, which detect … 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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2020 — Fuzzy PID Controller Optimization for Robot Dynamics with Aid of Differential EvolutionRésumé
In this Thesis, a Fuzzy proportional-integral-derivative (FPID) controller is presented to control the dynamics of a 3-DOF robot. A Differential Evolution (DE) optimization method was used to optimize the performance of the FPID controller. The results are compared and validated with three other optimization methods: Genetic Algorithm (GA), Particle Swarm Algorithm (PSO), and Imperialistic Competition Algorithm (ICA). In the proposed FPID, the Membership functions (MFs) for two inputs and one output, fuzzy rules, and scaling factors have been optimized. The Error is implanted in a cost function and the results have been compared. The DE method shows the best performance … Lire la suite
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2015 — An Evaluation of an Omni- Directional (Fisheye) Vision Sensor for Estimating the Pose of an Object,Résumé
Two case studies of enhanced field of view are presented in this work. In the first an omni-directional lens is mounted on a single digital camera. In the second three perspective digital cameras are combined into a unique assembly (placed in row with known position to each another) to increase the sensing capabilities of the camera system. To generate precise pose information from a fisheye camera, the unified/ generic model is employed. The model is utilized to define the geometry of the camera. Omni-directional images captured are remapped to construct perspective images. A callback function for a mouse click event … Lire la suite
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2021 — Efficient and Robust Methods for Computing Trust in Multi-Agent SystemsRésumé
In systems with multiple potentially deceptive agents, any single agent may have to assess the trustworthiness of other agents in order to decide with which agents to interact. To evaluate the trustworthiness of an agent in a multi-agent system, one often combines two types of trust information: direct trust information derived from one’s own interactions with that agent, and indirect trust information based on advice from other agents. Since the advisors themselves may be deceptive or unreliable, agents need a mechanism to assess and properly incorporate advice. In this thesis, we evaluate existing state-of-the-art methods for computing indirect trust in … Lire la suite
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2022 — Implementation of crystal mapping and energy calibration procedures for PET block detectors with pixelated scintillatorsRésumé
The prevailing high-resolution Positron Emission Tomography (PET) block detector architecture uses pixelated scintillating crystals coupled to a position sensitive photomultiplier tube (PS-PMTs) or a silicon photomultiplier (SiPM) array. In such detector designs a light guide layer between the finely segmented scintillating crystal array and coarsely segmented photosensitive layer is introduced, which allows to distribute the scintillation light over several elements of the photosensor. Commonly, such detectors employ some form of analog signal multiplexing to minimize the number of readout electronics channels and employ Center of Gravity (CoG) approach to calculate the positions of gamma ray interactions. The list mode data … Lire la suite
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2013 — Smoking to Cope with Pain: The Motivating Effects of Pain Induction on Smoking Urge and BehaviourRésumé
Millions of Canadians live with chronic pain. Substantial evidence has linked tobacco smoking with both acute and chronic pain conditions. Contemporary models of pain and smoking posit a cyclical relationship wherein individuals smoke to reduce pain in the short term; however, smoking to cope with pain indirectly exacerbates pain in the long term. Recent findings suggest situational pain is sufficient to increase smoking urge and immediate smoking behaviour (Ditre & Brandon, 2008). The purpose of the current investigation is to replicate and extend the findings of Ditre and Brandon (2008) by investigating the effects of (a) situational pain on smoking … Lire la suite
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2017 — A Pilot Test of an Internet-Based Smoking Cessation Intervention: Outcomes Across Chronic Pain and Pain-Free SamplesRésumé
Background: Smoking and chronic pain are major public health concerns in Canada. Contemporary models of smoking and chronic pain suggest a reciprocal and self-perpetuating cycle, wherein smoking reduces pain in the short term but indirectly exacerbates pain in the long term. Population evidence indicates that a majority of Canadian smokers want to quit smoking; however, 90% of quit attempts are unsuccessful. Quitting may be even more difficult for those with chronic pain. Pain-related anxiety and expectancies that smoking will reduce pain have been suggested as additional cessation barriers faced by some individuals with chronic pain. Internet-based interventions have been suggested … Lire la suite
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2020 — Semicontinuum Modeling of Acid Catalyzed Aqueous Reaction: Ethene Hydration and Mechanochemical Lignin CleavageRésumé
Careful studies are still needed to know how to accurately predict energies of reaction and activation in aqueous chemistry. This thesis applies semicontinuum modelling to acid-catalyzed reactions involving consumption or production of water. First, ethene hydration (ethene + H2O + H3O+ TS+ ethanol + H3O+) is explored, with 19 different water-placement semicontinuum models for the challenging activation thermodynamics, to learn which are appropriate to reproduce the known Δ‡G, Δ‡H, and Δ‡S values (from temperature-dependent kinetics studies). New tools are developed, particularly (i) a solvent confinement correction (SCC) of 3 kcal mol-1 per confined water and (ii) a Trouton’s … Lire la suite
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2020 — Study of Neutron Reflector for the HALO-1kT Supernovae Neutrino DetectorRésumé
The Helium and Lead Observatory 1 Kilotonne (HALO-1kT) is a lead-based detector to study electron neutrinos emitted from core-collapse supernovae. It is proposed to follow the same purpose as the HALO detector located at SNOLAB but with higher detection efficiency. The sensitivity to electron neutrinos makes HALO-1kT (and also the current HALO detector) unique in the sense that all other detectors with capability to detect supernova neutrinos are sensitive to anti-electron neutrinos through charged- current inverse beta-decay such as the Super-Kamiokande, LVD, IceCube and KamLAND. HALO-1kT's sensitivity to supernova neutrinos is larger than that for HALO due to its proposed … Lire la suite
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2021 — Assessing Biochar Effects on Natural Fiber-Ground Tire-Agriculture Plastic CompostiesRésumé
Globally, the increasing population, urbanization and industrialization produces excessive waste. Plastics from consumer products, rubber from tires, and other organic waste from forestry and agriculture are accumulating faster than they can decompose. Presently, plastic production exceeds 8300 million tonnes, of which ~55% ends up in landfills. Annually, ~1 billion waste tires are generated with only 100 million tires being recycled. However, awareness and government regulations, like the Canada Zero Plastic Waste Strategy to be achieved by 2030, focusses on reduction and reutilization of waste streams. The research reported herein seeks to contribute by assessing composite that utilize waste streams. The … Lire la suite
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2020 — Material Property Modeling of Ground Tire - Recycled Polymer - Natural Fiber CompositeRésumé
Composites made of thermoplastic with ground tire rubber (GTR) have attracted increasing interest as recycled rubber with reclaimed polymer offer advantages of better tensile properties, better toughness, low energy requirement for molding, more economical, and provides an opportunity to add value to disposed material. Thermoplastic material studied herein is primarily recycled linear low-density polyethylene (RLLDPE) from agricultural films with 10% being virgin LLDPE. The agricultural plastic obtained from scrap grain bags contain naturally oxidized macromolecules that provides better adhesion with GTR. In addition, hemp fiber processed from crop residue provides reinforcement to enhance the tensile strength and stiffness of the … Lire la suite
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2016 — Real-Time Sentiment-Based Anomaly Detection in Twitter Data StreamsRésumé
Twitter has over 316 million active users and the engagement of these Twitter users results in the rapid production of data, notably in the context of popular topics (such as news stories, politics, and sports). This data is available in the form of data streams, which has led many researchers to develop analysis techniques especially for Twitter data streams. Although anomaly detection in time series is a well established research area, its application to detect sentiment-based anomalies in large volumes of streaming data began recently. A sentiment-based anomaly is de ned as a sudden increase in the time series of … Lire la suite
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2025 — Secure and scalable blockchain mechanisms for IoT applicationsRésumé
Integrating blockchain with IoT ensures secure, transparent data exchange through immutability and consensus mechanisms, preventing data tampering. However, the increasing number of IoT devices raises risks like unauthorized access and network attacks. Blockchain scalability issues also affect throughput and latency, challenging real-time IoT applications. This thesis addresses these challenges through four contributions that aim to improve the security, scalability, and efficiency of blockchainbased IoT networks, balancing security with performance needs. Our first contribution is to develop an end-to-end security mechanism for IoT networks, called the trust-based ABAC mechanism for IoT networks (TABI). TABI integrates edge computing and blockchain technology to … Lire la suite
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2021 — Adaptive Quality of Service and Trust Based Lightweight Secure Routing Algorithm for Dense Wireless Sensor NetworksRésumé
Wireless Sensor Networks (WSNs) are group of wireless devices that are deployed in an adhoc manner and are generally left unattended. The main advantages of WSNs are that they are simple to use, allow the use of inexpensive sensor nodes, and have good scalability. WSNs are useful in object tracking, periodic monitoring, and event detection applications. However, the inherent characteristics of the WSNs, such as limited resources and low computation, make them vulnerable to various types of security attacks. Therefore, security mechanisms are needed to secure the network and protect against various security attacks. Conventional security mechanisms, such as cryptography … Lire la suite
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2022 — Aquatic ecosystems’ responses to past human activities in the neotropicsRésumé
Lake systems are essential for the environment and human populations. Nevertheless, human activities have strongly modified aquatic ecosystems, and many lakes have been affected by anthropogenic stressors, including eutrophication, acidification, increased sediment load, among others. In the last years, the study of the environmental history of lakes has increased, as well as the need for assessing the changes due to anthropogenic activities on aquatic systems. However, the information about how freshwater ecosystems in the neotropics have responded to natural forcings e.g., climate variations and or anthropogenic activities, is still scarce. Sediments accumulated in lakes provide a useful archive that can … Lire la suite
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2017 — Spin Polarizability of a Proton using Polarized Photon Beam and Polarized Butanol Target at Mainz MicrotronRésumé
Within this work, the data analysis and experimental results on the measurement of the double polarization observable (or beam-target asymmetry), Σ2z, for real Compton scattering off the proton is presented. The Σ2z values are measured via a circularly polarized photon beam incident upon a longitudinally polarized butanol target in the resonance region, Eγ = 250-310 MeV. This experiment was performed at the MAMI-A2 tagged photon facility in Mainz, Germany, during two experimental beamtimes in 2014 and 2015. This work also involves the extraction of proton spin polarizabilities, which are fundamental structure constants, similar to its charge and mass. These constants … Lire la suite
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2011 — Statistical Modeling for Tailings Consolidation Using Index PropertiesRésumé
The extraction of mineral resources from the earth generates large volume of mine tailings which are usually disposed hydraulically in tailings pond. To minimize the environmental concerns associated with deposition of mine wastes and reclamation of the containment ponds, the tailings need to undergo an efficient consolidation. The main objective of this research was to develop statistical models for tailings consolidation using index properties based on data in the literature thereby, capturing physicochemical interactions. The first model was developed for groups of tailings (sedimentary clays, residual soils and oil sand tailings) and the second model was developed for all tailings. … Lire la suite
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2012 — Role of β-galactofuranose and β-glucan in Aspergillus nidulans hyphal cell wall ultrastructure and physical propertiesRésumé
The fungal cell wall is a first line of defence from the external environment or chemical treatments. Glucan, chitin and mannan are the main components of the Aspergillus nidulans hyphal cell wall. The sugar β-galactofuranose is a minor component of the cell wall and thought to be responsible for cross-linking of the other cell wall components, therefore responsible for maintaining cell wall structural integrity. We investigated the role of β-galactofuranose on the structure and physical properties of the hyphal cell wall. Based on its unique capacity to image live samples, atomic force microscopy was used to determine both the ultrastructure … Lire la suite