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In-Field Observations Of Heavy Mining Vehicle Wheels And Analyses Of Proposed Solutions To Enhance Safety, Aleksander Tonkovich
In-Field Observations Of Heavy Mining Vehicle Wheels And Analyses Of Proposed Solutions To Enhance Safety, Aleksander Tonkovich
Electronic Theses and Dissertations
This research strives to enhance the safety of multi-piece wheel assemblies as injuries and fatalities are associated with their failure, yet information on this topic is limited. Experiments were performed to determine mechanical performance and planar deformation characteristics of several tires to aid in numerical model development. For a 29.5-29 tire, observations included determining vertical versus lateral deflection relationships (0.310 mm/mm), and vertical (2.59 kN/mm) and lateral (6.29 kN/mm) stiffness. A database capable of tracking wheel maintenance trends based on historical data was developed, allowing maintenance schedules to be estimated. A safety shield system was proposed. Effectiveness of the design …
Acoustic Communication In Thicket Habitats: Vocal Behaviour And Vocal Divergence In Mesoamerican Melozone Ground-Sparrows, Luis Andres Sandoval Vargas
Acoustic Communication In Thicket Habitats: Vocal Behaviour And Vocal Divergence In Mesoamerican Melozone Ground-Sparrows, Luis Andres Sandoval Vargas
Electronic Theses and Dissertations
Acoustic communication is a critical component of social interactions in birds. There are relatively few quantitative studies of the vocal behaviour of tropical bird species, in spite of the rich avian biodiversity in the tropics and the extensive variety of vocalizations they produce. This lack of information inhibits our ability to understand the behaviour and ecology of tropical birds, and impairs our ability to perform comparative analyses from an evolutionary perspective. In this dissertation, I study the vocalizations of three species of tropical ground-sparrow: Melozone biarcuata (Prevost's Ground-sparrow), Melozone kieneri (Rusty-crowned Ground-sparrow), and Melozone leucotis (White-eared Ground-sparrow). I provide the …
In The Wilderness, Aaron Daigle
In The Wilderness, Aaron Daigle
Electronic Theses and Dissertations
In the Wilderness is a poetry manuscript depicting the synthesis of science and spirituality. Though scientific and spiritual viewpoints are conventionally posed in a dialectic, this manuscript is a deconstruction in three sections that reveals physics and metaphysics to be complementary or even synonymous. Interconnectedness is envisioned through poetry. The first section poses competing metaphysical perspectives, the second section accentuates science, and the third section portrays a harmonious whole. The variety of poetic forms in this manuscript respond to discoveries in science, and either figuratively or symbolically emulate phenomena identified by scientists and physicists as they intersect with spiritual perspectives, …
An Investigation Of The Challenges Experienced By Somali Refugee Students In Canadian Elementary Schools, Mohamad Najib Ayoub
An Investigation Of The Challenges Experienced By Somali Refugee Students In Canadian Elementary Schools, Mohamad Najib Ayoub
Electronic Theses and Dissertations
The purpose of this qualitative research was to investigate the challenges and experiences of Somali refugee students as they integrate into Canadian English elementary public schools. The method of data collection in this study was one-on-one interviews. A total of seven Somali refugee students were interviewed. The exploration into the participants' experiences revealed that they faced many pre-migration challenges in refugee camps before resettling in Canada, as well as post-migration challenges with settlement and integration into Canadian culture and school systems. Members of the school community, including educators, administrators, and students, have a major role to play in supporting Somali …
Cognitive Drama And The Plays Of Samuel Beckett, Gregory Raymond
Cognitive Drama And The Plays Of Samuel Beckett, Gregory Raymond
Electronic Theses and Dissertations
Drama, due to its dual-medium nature, is a unique genre of literature, and is a genre that gains meaning in both textual and performance modes. This study considers the relationship between script and performance in terms of elements specific to either writing (i.e. typographical layout) or performance (i.e. visual elements on stage). Drawing on Reuven Tsur's theory of cognitive poetics, this study propounds any meaning created by an element in a script can be equally created in performance and vice-versa, regardless of how that element may appear restricted to either script or performance. The theatrical work of Samuel Beckett serves …
Thermal And Microstructural Analysis Of The A356 Alloy Subjected To High Pressure In The Squeeze Casting (Sc) Umsa Technology Platform, Mohammad Khurshed-Ul Alam
Thermal And Microstructural Analysis Of The A356 Alloy Subjected To High Pressure In The Squeeze Casting (Sc) Umsa Technology Platform, Mohammad Khurshed-Ul Alam
Electronic Theses and Dissertations
The effect of cyclic pressure on the thermal and microstructural behaviour of the A356 alloy and the addition of commercial Al-Sr Master Alloy, Nano Alumina Master Alloy and a combination of both Master Alloys during the squeeze casting was investigated in this study. The results show that the α-dendrite growth temperature was increased and the Al-Si eutectic growth temperature was decreased substantially, resulting in a super refined, as-cast, equiaxed α-Al cells and ultra fine dendritic eutectic Si in the modified and unmodified A356 aluminum alloy. Moreover, very rapid spheroidization of the Si particles was observed within a very short Solution …
Novel Coordination Cages From T-Shaped Ligands, Ismail Khalafalla Elguraish
Novel Coordination Cages From T-Shaped Ligands, Ismail Khalafalla Elguraish
Electronic Theses and Dissertations
The coordination bond is very useful for supramolecular chemists because of its directionality and reversibility which lead to stable compounds. This thesis describes the synthesis and characterization of new right-angled benzimidazole-based pyridyl ligands and the resulting assemblies that are formed when these ligands were combined with a cis -protected platinum(II) complex. Chapter one gives a brief introduction about how coordination chemistry interfaces with supramolecular chemistry by utilizing coordination bonding in self-assemblies. Chapter two describes the preparation and characterization of new T-shaped bipyridine ligands with a benzimidazole core and the surprising folded tetramers resulted from the combination of these ligands with …
Instructional Coaching Relationships: An Interpretative Phenomenological Analysis, Deanna Marie Elizabeth Fougere
Instructional Coaching Relationships: An Interpretative Phenomenological Analysis, Deanna Marie Elizabeth Fougere
Electronic Theses and Dissertations
With the recent adoption of the literacy/instructional coaching model in many Ontario school boards, there is a need to further examine the coaching relationship between the coach and coachee and how it creates a space conducive for professional learning to occur. This study adopted a qualitative approach using Interpretative Phenomenological Analysis (IPA) to examine the lived experience of instructional coaching and the instructional coaching relationship in the secondary school setting from a strengths-based perspective. Three instructional coaches and three corresponding coachees in a southwestern Ontario school board participated in semi-structured interviews. The notions of trust, growth, and power and resistance …
Development Of A Generalized Finite Difference Scheme For Convection-Diffusion Equation, Shixin He
Development Of A Generalized Finite Difference Scheme For Convection-Diffusion Equation, Shixin He
Electronic Theses and Dissertations
The traditional finite difference method has an important limitation in practical applications, which is the requirement of a structured grid. The purpose of this thesis is to improve the finite difference scheme for application on complex domains. The analysis of the Finite Difference method is carried out for 1D model problems governed by the convection-diffusion equation. The Stencil Mapping method is developed for complex domains. One of the features of this new scheme is that the value at a node can be calculated by using only the neighbouring values on the 3-point stencil. This allows finite differencing for arbitrary nodal …
The Development Of Polymer-Coated Electrodes For Chemical Detection, Xuefeng Hu
The Development Of Polymer-Coated Electrodes For Chemical Detection, Xuefeng Hu
Electronic Theses and Dissertations
This research focuses on the development of simple and cost effective approaches for making electrochemical sensors with a great sensitivity and selectivity. As an economic and abundant starting material, organic substrates were investigated to making conductive polymers that showed promising electrocatalytic activities. Firstly, a poly(4-bromoaniline) film was successfully synthesized on a gold electrode and the porous film which was made up of nano-ribbons on the Au electrode was used for the recognition of amino acids enantiomers. Secondly, different halogen ions were introduced to manifest the properties of the synthesized polymers. The results show that bromide ions have significantly inhibited the …
Exploration Of Fatigue In Second Year Nursing Students, Michelle Lynn Groundwater
Exploration Of Fatigue In Second Year Nursing Students, Michelle Lynn Groundwater
Electronic Theses and Dissertations
The purpose of this descriptive study was to explore fatigue in second year nursing students at a university in southwestern Ontario. The study examined the perceptions of fatigue at the end of clinical consolidation in second year and the predictors of fatigue. A sample of 66 undergraduate nursing students completed a demographic questionnaire and the Occupational Fatigue Exhaustion Recovery (OFER) scale. Findings revealed that nursing students experienced moderate levels of fatigue with low inter-shift recovery. More than half of participants felt exhausted at work. The majority of participants reported having no energy left after a typical work period. Over half …
Failure Mechanism Of Coated Biomaterials Under High Impact-Sliding Contact Stresses, Ying Chen
Failure Mechanism Of Coated Biomaterials Under High Impact-Sliding Contact Stresses, Ying Chen
Electronic Theses and Dissertations
This study uses a newly developed testing method-- inclined cyclic impact-sliding test to investigate the failure behaviors of different types of biomaterials, (SS316L, Ti6Al4V and CoCr) coated by different coatings (TiN, DLC and PEO), under extremely high dynamic contact stress conditions. This test method can simulate the combined impact and sliding/rolling loading conditions, which is very practical in many aspects of commercial usages. During the tests, fatigue cracking, chipping, peeling and material transferring were observed in damaged area. This research is mainly focused on the failure behaviors of load-bearing materials which cyclic impacting and sliding are always involved. This purpose …
Study Of Fuels And Fuelling Strategies For Enabling Clean Combustion In Compression Ignition Engines, Xiaoye Han
Study Of Fuels And Fuelling Strategies For Enabling Clean Combustion In Compression Ignition Engines, Xiaoye Han
Electronic Theses and Dissertations
The main objective of this dissertation is to improve the efficiency and emissions of compression ignition engines. Adaptive fuelling control strategies are applied for enabling the low temperature combustion on the research engines of high compression ratios using a selected set of fuels that are vastly different from the conventional diesel. These fuels include n-butanol, gasoline, ethanol, and nine diesel fuels with specifically formulated Cetane numbers, aromatic contents, and boiling temperatures. The effects of these fuels on the engine performance are compared with those of diesel in both the high temperature combustion and low temperature combustion modes in terms of …
Computational Studies Into Iron-Based Biocatalysis, Rami Gherib
Computational Studies Into Iron-Based Biocatalysis, Rami Gherib
Electronic Theses and Dissertations
Iron-containing enzymes are ubiquitous in nature and play several key roles in living organisms. Unfortunately, like many other types of enzymes, their catalytic mechanisms are often elusive. The work presented herein investigates computationally the catalytic processes of three iron-containing enzymes: glycerophosphosdiesterase from Enterobacter aerogenes (GpdQ), coral allene oxide synthase (cAOS) and S-ribosylhomocysteinase (LuxS). While some were investigated primarily using density functional theory (DFT), others used quantum mechanics/molecular mechanics (QM/MM) and molecular dynamics (MD) simulations in a complementary fashion.
Computational Insights Into The Accuracy And Editing Of Aminoacyl Trna Synthetases, Grant B. Fortowsky
Computational Insights Into The Accuracy And Editing Of Aminoacyl Trna Synthetases, Grant B. Fortowsky
Electronic Theses and Dissertations
Proteins are ubiquitous in nature, carrying out many of life's functions. However, for these biomolecules to function correctly they must be accurately synthesized. The task of ensuring the desired accuracy is achieved falls to Aminoacyl tRNA Synthetases (aaRS). These enzymes catalyze the activation and transfer of amino acids to tRNA. In addition to carrying out these reactions, they also edit against the incorporation of incorrect amino acids. Within this thesis the many facets of aaRS editing and accuracy are examined in detail. In particular, the editing mechanism of Hcy and Hse in MetRS is elucidated in detail. These results allow …
Determination Of Optimal Power For Zigbee-Based Wireless Sensor Networks, Okhamila Yusuf
Determination Of Optimal Power For Zigbee-Based Wireless Sensor Networks, Okhamila Yusuf
Electronic Theses and Dissertations
In designing WSNs, both the transmit power, network topology, and routing scheme are considered. Transmitting at lower power affect the connectivity of the network while transmitting at excessive power reduces the lifetime of nodes and increases the network interference. Thus, determining the optimal power of the nodes that will be necessary to guarantee network connectivity. In this work, a practical self-healing and self-configuring real life prototype ZigBee Wireless Mesh Sensor Networks (WMSNs) was design to evaluate the performance of IEEE 802.15.4/ZigBee. We showed that increasing the transmit power of nodes from -6dBm to 0dBm in WMSNs leads to improved packets …
Analysis Of Lipoprotein(A) Receptors: Roles In Catabolism And Pericellular Plasminogen Activation, Rocco Romagnuolo
Analysis Of Lipoprotein(A) Receptors: Roles In Catabolism And Pericellular Plasminogen Activation, Rocco Romagnuolo
Electronic Theses and Dissertations
Elevated plasma concentrations of lipoprotein(a) (Lp(a)) have been identified as an independent, causal risk factor for coronary heart disease. Lp(a) resembles low-density lipoprotein (LDL), but is distinguished by the covalent addition of apolipoprotein(a) (apo(a)) to the apolipoproteinB-100 (apoB-100) moiety of LDL. Apo(a) shares homology with the zymogen plasminogen and Lp(a)/apo(a) can inhibit plasminogen activation to the serine protease plasmin on the fibrin surface. In addition, apo(a)/Lp(a) can inhibit fibrinolysis through attenuation of Glu1-plasminogen to Lys78-plasminogen conversion: a key positive feedback mechanism in accelerating plasmin formation. Cellular receptors for Lp(a)/apo(a) are suggested to contribute to the pathophysiological mechanisms of Lp(a) such …
Web Service Network Analysis, Avani Gade
Web Service Network Analysis, Avani Gade
Electronic Theses and Dissertations
A Web Service is a software component that is accessible on the Web. Web Services can collaborate to form composite services, which are called Mashups. Services and Mashups interconnect with each other, forming a complex network. This technological network evolves in a large scale without central control. As a new type of software network, there is an urgent need to study its topological properties. This thesis studies the Web Service Network that consists of 4255 primitive web services and mashups collected from ProgrammableWeb.com. We study various centralities of the network, including degree, betweenness, closeness and page rank. We find that …
Predicting Reward Sensitivity In A Non-Clinical Population, Brianne Brooker
Predicting Reward Sensitivity In A Non-Clinical Population, Brianne Brooker
Electronic Theses and Dissertations
Reward sensitivity (RS) has been implicated in a range of suboptimal psychological outcomes, including ADHD, antisocial personality disorder, borderline personality disorder, and callous-unemotional personality traits. Less known, however, is the relation between these constructs and RS in the non-clinical population. The current study investigated the utility of these traits in predicting RS in an undergraduate sample ( N = 225). Hierarchical multiple regression analyses suggested that impulsive ADHD symptoms and relational aggression predicted RS, as measured by two distinct questionnaires ( R 2 adj. = .15 for SPSRQ Sensitivity to Reward [Torrubia, Ávila, Moltó, & Caseras, 2001]; R 2 adj. …
Experimental Determination Of The Forming Limits Of Dp600 And Aa5182 Sheets In Electrohydraulic Free Forming, Christopher Joel Lyall Maris
Experimental Determination Of The Forming Limits Of Dp600 And Aa5182 Sheets In Electrohydraulic Free Forming, Christopher Joel Lyall Maris
Electronic Theses and Dissertations
Electrohydraulic forming is a pulsed metal forming process that uses the discharge of electrical energy across a pair of electrodes submerged in fluid to form sheet metal. Pulsed metal forming processes, including electrohydraulic forming, have been shown to increase the formability of sheet metals, which is of significant industrial interest. An experimental procedure was developed to quantify the formability in electrohydraulic free forming (EHFF) that is consistent with the quasi-static formability assessment convention. Novel sheet metal specimen geometries were created to quantify the formability across the entire minor strain spectrum. The experimental EHFF forming limit curve (FLC) was determined for …
Effect Of Suction On Local Scour Around Circular Bridge Piers, Mohammed Jahan
Effect Of Suction On Local Scour Around Circular Bridge Piers, Mohammed Jahan
Electronic Theses and Dissertations
An experimental study was conducted in the Hydraulics Laboratory of the University of Windsor, involving analysis of local scour around circular model bridge piers placed on a non-cohesive sand bed, with suction and no suction conditions. Experiments were conducted using three model circular piers. The results show that a narrower pier will induce a large value of depth averaged channel mean velocity in comparison to a wider pier in the same flow field. Furthermore, suction generally creates larger equilibrium scour depth, and increases near bed velocity, and decreases friction velocities with increasing suction. The present results indicate that, generally, scour …
Examining The Relationships Between Trust In Athlete Leadership And Cohesion, Geoffrey M.A. Hackett
Examining The Relationships Between Trust In Athlete Leadership And Cohesion, Geoffrey M.A. Hackett
Electronic Theses and Dissertations
The current study examined trust in athlete leadership. The study examined whether an athlete's propensity to trust others moderated the relationship between the antecedents of trust and trust in athlete leadership. In addition, the study examined whether the consequences of trust mediated the relationship between trust in athlete leadership and outcomes of trust. The sample comprised of 125 varsity athletes. Results showed Ability and Benevolence were significant predictors of Trust in the Athlete Leader, while Propensity to Trust did moderate the relationship between Benevolence and Trust in the Athlete Leader. As well, results indicated that Closeness fully mediated the relationship …
Exploring The Developmental Roles Of Plk4, Candace Rapchak
Exploring The Developmental Roles Of Plk4, Candace Rapchak
Electronic Theses and Dissertations
Plk4 is a member of the Polo-like kinase family of cell cycle regulators that has well established roles in the regulation of centrosome duplication, cytokinesis and the DNA damage response in adult cells. Mice with homozygous Plk4 null mutations are embryonic lethal at E7.5 and do not develop somites, notochord nor a proper neural tube. In this study, plk4 was cloned and characterized for expression and function during the embryonic development of Xenopus laevis. Xenopus plk4 is expressed in a diverse number of tissues including the somites, lens and retina. Translational knockdown of plk4 via morpholinos causes perturbations to somitogenesis …
The Effect Of Sodium Salicylate On The Level Of Gabab Receptor Subunits In The Rat's Central Auditory System, Sehrish Butt
The Effect Of Sodium Salicylate On The Level Of Gabab Receptor Subunits In The Rat's Central Auditory System, Sehrish Butt
Electronic Theses and Dissertations
Tinnitus is a phantom sensation of sound in the absence of acoustic stimulus and can be induced by ototoxic drugs such as sodium salicylate (SS). Tinnitus is likely related to hyperactivity in central auditory structures. In the central nervous system, activity is dependent on excitatory/inhibitory neurotransmission. Gamma-aminobutyric acid (GABA) is a major inhibitory neurotransmitter. It can activate the type-B GABAergic receptor (GABA B receptor), which can control the level of excitation/inhibition through regulating the release of neurotransmitters and lowering the cell membrane potential. I hypothesized that SS affects hearing by changing the level and distribution of the GABA B receptor …
Representations Of Banach Algebras Subordinate To Topologically Introverted Subpaces, Julan Al-Yassin
Representations Of Banach Algebras Subordinate To Topologically Introverted Subpaces, Julan Al-Yassin
Electronic Theses and Dissertations
We show the existence of a natural bijection between continuous representations of a Banach algebra A on a reflexive Banach space Y subordinate to a topologically introverted subspace X of A * , and normal representations of X * on Y . We define the spaces ap(A) and wap(A) and study some of their properties. We show that if A has a bounded approximate identity, then a functional on A is in wap(A) if and only if it is a coordinate function of a continuous representation of A on a reflexive Banach space. We prove that whenever A has a …
Effects Of Inflow Parameters And Operating Conditions On The Structural Response And Power Production Of A Commercial Wind Turbine, Jamie C. Smith
Effects Of Inflow Parameters And Operating Conditions On The Structural Response And Power Production Of A Commercial Wind Turbine, Jamie C. Smith
Electronic Theses and Dissertations
Onshore wind farms can experience a wide variety of wind conditions, even in simple or flat terrain, as a result of diurnal and seasonal changes in stability in the atmospheric boundary layer. At a farm in Southwestern Ontario, a commercial-sized wind turbine operates in close proximity to a meteorological mast capable of quantifying the inflow parameters of the approaching wind profile. The turbine's steel supporting tower has been instrumented with an optical strain gauge array measuring longitudinal deformation at multiple elevations. Wind conditions have been classified into two major profile types on the basis of two key inflow parameters: vertical …
The Pleiotropic Effects Of Dexamethasone On Breast Cancer Cell Behaviour, Martin Vance Crozier
The Pleiotropic Effects Of Dexamethasone On Breast Cancer Cell Behaviour, Martin Vance Crozier
Electronic Theses and Dissertations
Endogenous glucocorticoid (GC) steroids are lipophilic hormones secreted in response to the hypothalamic-pituitary-adrenal axis. Their anti-inflammatory and immunosuppressive potency is the basis for their frequent use in clinical applications. Dexamethasone (Dex) is a synthetic GC given to breast cancer patients to reduce emetic effects of chemotherapeutic drugs (e.g., paclitaxel (Pac)). GCs mediate their effects on cell behaviour through activation of the GC receptor (GR). Active GR regulates approximately 10% of the human genome influencing numerous physiological and developmental parameters including cell proliferation, invasion, migration, and survival. The prevalent use of Dex in breast cancer treatment is disconcerting given that little …
Just World, Kayleigh Csaszar
Just World, Kayleigh Csaszar
Electronic Theses and Dissertations
Just World is an anti-police procedural examining the complexities that minorities encounter within the police precinct. The nonlinear plot follows Abel Palmer's rape by a fellow officer. The psychological aftermath and impact of the rape is narrated through multiple and alternating first-person perspectives. Violence acts as a theme connecting the rape to the aggression enacted against officers of racial minority.
Transient And Steady-State Mobile Air Conditioning Operation With The Inclusion Of And Internal Heat Exchanger, Stephen Gemin
Transient And Steady-State Mobile Air Conditioning Operation With The Inclusion Of And Internal Heat Exchanger, Stephen Gemin
Electronic Theses and Dissertations
This thesis investigates the change in power consumption for a mobile air conditioning (MAC) system from the introduction of an internal heat exchanger (IHX). The internal heat exchanger is so named since it is a simple heat exchanger that is placed internally into the AC system. It serves to transfer heat from the high to low pressure refrigerant to maximize the system cooling capacity. The work investigates how other performance parameters such as the pressure drops, IHX capacity, evaporator capacity, coefficient of performance and the absolute efficiency ratio change from the introduction of the IHX. The steady-state simulation results are …
Polo-Like Kinase 4 At The Nexus Of Epigenetic Modifications And The Dna Damage Signaling Network, Gayathri Sivakumar
Polo-Like Kinase 4 At The Nexus Of Epigenetic Modifications And The Dna Damage Signaling Network, Gayathri Sivakumar
Electronic Theses and Dissertations
The evolutionarily conserved polo-like kinases (PLKs) are pivotal cellular proteins that govern mitotic progression, DNA damage, centrosome replication, and neuronal processes. Appropriate expression of these serine/threonine kinases is essential for cellular homeostasis as perturbations to PLK expression often results in oncogenic transformation and tumor development. In addition to loss of heterozygosity, the PLKs are also susceptible to aberrant epigenetic modifications in tumorigenic states. My studies describe the deregulation of the PLKs in the context of hematological malignancies and provide support that the methylation-dependent dysregulation may possess diagnostic and prognostic value. Moreover, I have characterized novel interacting substrates (PRMT5 and GADD45a) …