Liste complète
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2015 — Characterization of novel genes involved in cell envelope function in Rhizobium leguminosarumRésumé
The complex structure of the rhizobial Gram-negative cell envelope is a crucial component for both survival in the environment, as well as for establishing a successful symbiosis with its legume host. The objective of this research was to identify and characterize novel genes involved in cell envelope development in Rhizobium leguminosarum. Previous studies have identified a positive correlation between cell envelope defective mutants and an inability to grow on peptide-rich media, as well as minimal media supplemented with 3 mM glycine. Identifying novel genes involved in cell envelope function through the use of transposon mutagenesis, and screening for growth sensitivity … Lire la suite
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2020 — Deliberately Thinking About Analytic Thinking Style: Developing The Comprehensive Thinking Style QuestionnaireRésumé
Dual-process theories distinguish between more automatic, intuitive cognitive processes and analytical, reflective processes. One of the major contributions of this theoretical perspective is that people vary in the extent to which they are disposed to think in a more analytic and reflective way relative to relying more on their intuitions. Such individual differences have been linked to a large number of other important psychological factors, such as general cognitive ability (Stanovich, 1999), improved detection of fake news (Pennycook & Rand, 2019) and pseudo-profound bullshit (Pennycook, Cheyne, et al., 2015) as well as disbelief in epistemically suspect claims (Pennycook, Fugelsang, et … Lire la suite
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2013 — Measurements of the Molar Heat Capacity and the Molar Excess Enthalpy for Various Alkanolamines in Aqueous SolutionsRésumé
The purpose of this study is to determine the molar heat capacity (Cp) and molar excess enthalpy for 4-Ethylmorpholine, 2-(Isopropylamino)ethanol, 2-(Diisopropylamino)ethanol, 3-Dimethylamino-1-propanol(3-DEAP), and1-Dimethylamino-2-propanol (1-DEAP) in aqueous solutions by means of a C80 heat flow calorimeter over the entire range of mole fractions at different temperatures. The heat capacity measurements were carried out from 303.15K to 353.15K, whereas the excess enthalpies were measured at 298.15, 313.15, and 333.15K. An estimated uncertainty of 1% was found in the measured amount of the molar excess enthalpy as well as heat capacity. Among the five selected alkanolamines, 2-DPAE possessed the highest value in terms … 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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2018 — Confidence Interval Estimation for the Ratio of Binomial Proportions and Random Numbers Generation for Some Statistical ModelsRésumé
A general problem of the interval estimation for a ratio of two proportions p1=p2 according to data from two independent samples is considered. Each sample may be obtained in the framework of direct or inverse binomial sampling. Asymptotic confidence intervals are constructed in accordance with different types of sampling schemes with an application, where it is possible, of unbiased estimations of success probabilities and also their logarithms. Since methods of constructing confidence intervals in the situations when values for the both samples are obtained for identical sample schemes are already developed and well known, the main purpose of this paper … 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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2021 — Screening of Potential Polyamine Solvents for Carbon CaptureRésumé
Carbon dioxide (CO2) is one of the main greenhouse gases that significantly contributes to global warming. It is therefore imperative to reduce the amount of CO2 emissions into the atmosphere. Among CO2 capture sorbents, liquid amines have been used commercially as they have high capacities for CO2 as well as fast reaction rates. The purpose of this research work is to screen novel promising amines which can be used at an industrial scale for CO2 capture from natural as well as flue gas streams. Ideally, potential amines should have a high kinetic rate, high CO2 solubility and low regeneration energy. … Lire la suite
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2023 — Experiences of professionals working with pre-adolescent children who are using psychoactive substances in Regina, SKRésumé
The purpose of this thesis research was to 1) explore the pathways to seeking and accessing support for substance use among pre-adolescents from the point of view of professionals working with children under age of 12, and, 2) examine how these professionals’ views on pre-adolescent substance use inform what services this population receives. The goal of the study was not only to understand how preadolescents access services for substance use but how the views of professionals assist or create barriers to accessing these services. The study used a qualitative, multiple case study method to interview four service providers, representing different … Lire la suite
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2013 — A Theoretical Framework for Analysis of Communication PathwaysRésumé
Networks such as Peer-to-Peer (P2P), ad hoc, wireless sensor, and other complex networks do not support optimal communication between different devices across their configurations. They require appropriate algorithms to distribute data because they may have unspecific structures with a large amount of nodes, energy constraints, channel restrictions, and delays. The desired communication algorithms for these networks are simple and robust in order to handle these unpredictable characteristics. For example, gossip algorithms are used as core messaging algorithms for many distributed applications in wireless ad-hoc networks, sensor networks, and peer-to-peer networks because the underlying networks have complex unstructured topologies. This thesis … Lire la suite
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2016 — Precision-Based Selection Criteria for Classification with Ensembles of LearnersRésumé
A core problem in machine learning is to learn classi ers that categorize data into two or more classes. An ensemble of classi ers is made by integrating a set of base classi- ers to build a predictive model. In this thesis we review the principle of ensemblebased methods, especially boosting algorithms. We also introduce a new approach to ensemble learning based on the fact that it is often the case that one base classi- er h is particularly good for one particular class c. We modify the state-of-the-art ensemble method AdaBoost.M1 to take such class-speci c information into account … Lire la suite
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2020 — Pre-Service Teachers’ Perceptions And Expectations of K-12 Schooling Locales in SaskatchewanRésumé
The expectations which teachers hold affect their everyday decisions and, ultimately, the classroom, their instruction, the school, and the communities in which they serve. While there has been research into teachers’ expectations of locales of schooling in other parts of the world, there has been little research into the expectations that undergraduate education students hold towards specific locales of schooling within Saskatchewan. I conducted an exploratory phenomenographical study by interviewing four undergraduate students in the Faculty of Education at the University of Regina to learn more about their expectations and perceptions of band, rural, and urban locales of schooling in … Lire la suite
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2020 — Electrophilic Substitution and Cyclization Reactions in Tungsten-Coordinated ChlorophosphinesRésumé
Electrophilic substitution reactions of tungsten coordinated phosphenium ions [W(CO)5{PR′R}]+and phosphine triflates [W(CO)5{PR′R(OSO2CF3)}] have been investigated. Chloride abstraction from [W(CO)5{PPhCl2}] (7) was carried out using silver trifluormethanesulfonate to form [W(CO)5{PPhCl(OSO2CF3)}] (9). Reactions of 9 with nucleophiles H-R led to electrophilic substitution and monosubstituted phosphine complexes [W(CO)5{PPhRCl}] (R = N,N-diethylanilinyl, anisolyl, N,N-dimethyl-p-toluidinyl, p-tolyl, biphenyl, naphthyl, indolyl, thienyl, pyrrolyl, N-methylpyrrolyl). A second chloride abstraction and electrophilic substitution with H-R′ or allyltrimethylsilane led to tertiary phosphines complexes [W(CO)5{PPhRR′}] (R′ = ferrocenyl, phenylalkynyl, allyl). The reactions of [W(CO)5{PPhR}][AlCl4] and [W(CO)5{PPhR(OSO2CF3)}] (R = p-anisolyl, p-tolyl, indolyl, thienyl, N-methylpyrrolyl) with alkynes led to fused phosphole ring systems … Lire la suite
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2012 — An Exploration of How Homelessness Affects Indigenous WomenRésumé
This thesis is an exploration of how homelessness affects Indigenous women. This study was conducted using an Indigenous research paradigm and executed from an Indigenous world view. Seven Indigenous women who were currently or had lived experiences with homelessness shared their stories and experiences with the researcher. Narrative inquiry using storytelling and thematic grouping were used. The medicine wheel concept was used to discuss the themes that arose from the stories. The storytellers where affected in all areas of the medicine wheel by their experiences with homelessness. Finding quality affordable housing, recovering from addictions, and practising cultural traditions were significant … Lire la suite
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2020 — Computational Fluid Dynamics of High Temperature Shift Reaction of Reformate Gas in Fixed Bed and Membrane ReactorsRésumé
Crude biogas upgrade is required in order to boost its industrial use as it contains impurities such as carbon dioxide, carbon monoxide, hydrogen sulphide and ammonia that limits its value. Renewable hydrogen is a clean, carbon-free energy resource that is obtainable from biogas upgrade via the reforming process. To increase hydrogen yield and CO conversion in reformate gas, the product of reforming, the water gas shift (WGS) reaction is required. The conduction of the WGS reaction in a membrane reactor (MR) is a process intensive technology that not only increases hydrogen yield and purity but also reduces costs due to … Lire la suite
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2020 — La Créolisation: Processus, Dimensions, Et Contraintes: Le Cas Du Pidgin Nigérian,Résumé
Nigerian Pidgin evolved as a result of language contact with the colonialists and foreign traders. It is one of the fast-growing languages in Nigeria, it is the only language that has no native speakers, making it a unifying language. In spite of the fact that Nigerian Pidgin is probably the language with the highest population of users in Nigeria, it does not enjoy official recognition and is excluded from the education system. It lacks prestige because it is seen by some Nigerians especially the elites as a “bad” form of English and associated with a socially deprived and uneducated set … Lire la suite
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2017 — Embodied Capital, Envy, and Relative DeprevationRésumé
Inequality causes feelings of relative deprivation and envy. Inequality has almost exclusively been examined as an environmental variable, characterized by skewed distribution of resources; however, inequality can also manifest through individual differences in traits such as intelligence, strength, and attractiveness. These innate qualities aid in successful social competition and are collectively referred to as embodied capital. Mishra, Barclay, and Sparks (2017) posit that both environmental and embodied factors influence an individual’s relative state – their assessment of their competitive (dis)advantage. This study examined whether low embodied capital is associated with feelings of relative deprivation and envy. Participants (n = 198) … Lire la suite
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2021 — Systematic Approach to Degradation Studies in Catalyst Based Amine CO2 Capture ProcessRésumé
The effects of climate change have attracted concern globally which has led to an increase in research focused on diverse plans and technologies for mitigation. The use of solid catalyst in an amine based post-combustion CO2 capture (PCCC) has become a very attractive option as developments are actively ongoing to address some of the challenges that the conventional capture system faces. This research work evaluated the role that a new super acid, proprietary desorber catalyst (PDC) catalyst has on the amine degradation rate using a formulated optimum 4M DMAE/AMP equimolar blend in a full cycle bench scale CO2 capture pilot … Lire la suite
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2018 — Comparative Assessment, Parametric Sensitivity, Economics, and Modeling of Novel 1,5-diamino-2-methylpentane Based Amine Solvent Blend for CO2 Capture From Large Industrial SourcesRésumé
This research investigates the development of novel 1,5-diamino-2-methylpentane (DA2MP) based amine solvent blend for CO2 capture from large industrial sources. The lab-scale absorber and desorber pilot plant (2 inch by 42 inch each) were used to investigate the comparative CO2 capture analysis of the novel 2 kmol/m3 AMP-(1 to 3) kmol/m3 DA2MP blend to 5 kmol/m3 MEA and 2 kmol/m3 AMP-1 kmol/m3 PZ blend for the power plants (8 vol.% CO2 and 15.1 vol.% CO2), and lime kiln (30 vol.% CO2) industries. For the water-gas shift process plant (50 vol.% CO2) the CO2 capture performance of novel 3 kmol/m3 MDEA-(0.5 … Lire la suite
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2020 — Process Analysis and Optimization of Crude Glycerol Autothermal Reforming Using Response Surface Methodology and Artificial Neural NetworkRésumé
There is an urgent need to curtail the effects of global warming through the development of efficient, cheap and accessible alternative source of energy since the combustion of carbon containing compounds has become a problem. The combustion of hydrogen gas for example for either heat generation or use as fuel cells in automobiles produces only water vapour as by-product. Though, water vapour is also greenhouse gas, it does not last long in the atmosphere when released since hydrologic cycle ensures the excess water vapour is sent down via precipitation. Based on this and in addition to its high heat capacity, … Lire la suite
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2023 — Effects of flue gas impurities on amine stability in C02 capture processRésumé
Amine stability in a post-combustion carbon capture plant is considered one of the most essential parameters tracked to keep the process running at peak efficiency. The presence of impurities in exhaust gases (O2, SOx, NOx) is known to undergo undesired irreversible reactions with the amine to form products leading to solvent loss which impedes the optimum operation of the plant. Metal oxides (the main constituents of industrial exhaust gas fly ash) influence on solvent degradation however have not been reported extensively and hence this study aims at investigating the effects of different metal oxides common in the blast furnace exhaust … Lire la suite