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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Cong, Binghao;

    The primary objective of this thesis is to improve optical setups of a constant volume combustion chamber to better understand the vaporization and spray characteristics of various fuels. The schlieren imaging technique is utilized to visualize phenomena that are challenging to observe directly. In this thesis, the schlieren imaging is used to observe the spray and ignition characteristics of DME and diesel fuels under high injection pressure. First, various optical techniques are discussed and compared under the same test condition including schlieren, shadowgraph, and direct imaging. The advantages for these techniques are presented and the most appropriate technique for different testing scenarios is proposed. Second, the spray and ignition characteristics of DME and diesel are compared. The inert spray for both fuels are observed and compared using schlieren imaging technique. The reactive spray for both fuels are observed and compared using direct imaging and shadowgraph imaging system.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Scholarship at UWind...arrow_drop_down
    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Scholarship at UWindsor
    Thesis . 2023
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Scholarship at UWind...arrow_drop_down
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
      Scholarship at UWindsor
      Thesis . 2023
      License: CC BY
  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Alexander, Nicolle;

    More than two decades after its introduction, neoliberal ideology has increasingly created a class and race-based gap in relation to student achievement in Ontario’s education system. Due to market-based rhetoric shaping policies and legislation, schools are increasingly encouraging students to adhere to the demands of a newly globalized world with a focus on the economy, regardless of their background. This study aims to analyze the presence of neoliberal reforms in Ontario’s education system through decisions made in government from Mike Harris’ in 1995 to the present Doug Ford administration. Specifically, I investigate how the so-called knowledge economy has produced a system that enables students deemed marketable, often from middle- and upper-class white backgrounds, and disables non-marketable students, most often the working poor and the working class, and racial and ethnic minorities, through funding cuts, heightened accountability, and standardized testing. By evaluating Ministry of Education policy documents and documents for both Conservative Premier campaigns, I analyzed the rhetoric used to introduce, consolidate and solidify neoliberal discourse throughout the past twenty years. The results showed that by simplifying education to quantifiable measures, the education system now measures concepts such as equity and inclusion in schools through standardized testing and monthly reports. Further, the rhetoric used to solidify equity and inclusion within the system focuses more on the presentation of both rather than materializing its action in schools. In order to minimize the current student achievement gap in our education system, funding needs to be focalized in social services cut by our government level to properly re“instate” the intended actions of these policies.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Scholarship at UWind...arrow_drop_down
    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Scholarship at UWind...arrow_drop_down
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Rana, Shivang;

    The rarity of Melanoma skin cancer accounts for the dataset collected to be limited and highly skewed, as benign moles can easily mimic the impression of the melanoma-affected area. Such an imbalanced dataset makes training any deep learning classifier network harder by affecting the training stability. We have an intuition that synthesizing such skin lesion medical images could help solve the issue of overfitting in training networks and assist in enforcing the anonymization of actual patients. Despite multiple previous attempts, none of the models were practical for the fast-paced clinical environment. In this thesis, we propose a novel pipeline named SkinCAN AI, inspired by StyleGAN but designed explicitly considering the limitations of the skin lesion dataset and emphasizing the requirement of a faster optimized diagnostic tool that can be easily inferred and integrated into the clinical environment. Our SkinCAN AI model is equipped with its module of adaptive discriminator augmentation that enables limited target data distribution to be learned and artificial data points to be sampled, which further assist the classifier network in learning semantic features. We elucidate the novelty of our SkinCAN AI pipeline by integrating the soft attention module in the classifier network. This module yields an attention mask analyzed by DenseNet201 to focus on learning relevant semantic features from skin lesion images without using any heavy computational burden of artifact removal software. The SkinGAN model achieves an FID score of 0.622 while allowing its synthetic samples to train the DenseNet201 model with an accuracy of 0.9494, AUC of 0.938, specificity of 0.969, and sensitivity of 0.695. We provide evidence in our thesis that our proposed pipelines outperform other state-of-the-art existing networks developed for this task of early diagnosis.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Scholarship at UWind...arrow_drop_down
    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Scholarship at UWindsor
    Thesis . 2022
    License: CC BY
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Scholarship at UWind...arrow_drop_down
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
      Scholarship at UWindsor
      Thesis . 2022
      License: CC BY
  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Edrisy, Mohamed;

    The emergence of commercial FEA solvers was a significant breakthrough that boosted the accuracy and complexity of engineering design. While composite materials are special materials, their mechanical properties can be custom made by considering the needs and requirements of the design problem. Given the rapidly expanding global consumption of composite materials, access to FEA solvers capable of assigning these materials is an absolute requirement.The CATIA software is a platform for designing, analyzing, and manufacturing of parts. However, there is no meaningful documentation in the public domain exploring the finite element functionalities of CATIA software for composite materials. Isotropic materials are used in numerous references investigating the CATIA FEA solver; however, the extension to composite materials has been lacking. The present study investigates two phenomena: (1) the procedure to import composite material properties into the Generative Structural Analysis workbench, and (2) the pre-processing and the post-processing toolbars and functionalities pertaining to this matter. The thesis does not address the CAD modelling aspects of the composites per se since there are many references available concentrating on such issues in the CATIA public literature.The composite models are selected from different scenarios labeled as benchmark problems. The results generated by CATIA’s native FEA solver for the static, dynamic, and buckling cases are compared with other tools available to the engineering community. These tools encompass the Classical Lamination Theory and two commercial CAE codes, known as ABAQUS and ANSYS.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Scholarship at UWind...arrow_drop_down
    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Scholarship at UWind...arrow_drop_down
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Stone, Rachel Marie;

    Monitoring intracranial pressure (ICP) has become an important practice in patients with elevated ICP (e.g., traumatic brain injury) to improve patient outcome. However, little information exists surrounding chronic, but sub-clinical elevations in ICP, which may stem from classic cardiovascular risk factors, such as elevated blood pressure (BP). The current methods to assess ICP are invasive and costly; but optic nerve sheath diameter (ONSD) and blood flow pulsatility (pulsatility index; PI) are promising non-invasive techniques, both of which have been reported to strongly correlate with invasive measures of ICP in pathology. However, the interactions of BP, ONSD and PI in otherwise healthy adults, remains undetermined. Accordingly, the purpose of this investigation was to determine the relationship between ONSD, PI and BP, and to highlight possible sex differences in a population of young healthy adults. Sixteen participants (6 females) underwent assessment of arterial BP, ONSD (left and right eyes) and PI (left common carotid artery) using ultrasound. There was a strong correlation between mean ONSD (left and right eye combined) and PI (R=0.735, p=0.001). There was no significant relationship between PI and BP (R=0.058, p=0.832) or ONSD and BP (R=0.272, p=0.309). Additionally, there was a significant difference between males and females for mean ONSD, whereby males demonstrated a larger diameter (males=0.4860.110 vs. females=0.3530.062cm; p=0.018), but there was no significant difference in PI between males and females (males=2.3630.613 vs. females=1.9500.196; p=0.136). Results of this study confirm the relationship between ONSD and PI in a healthy population. While ICP was not directly assessed in the current study, the strong associations between ONSD and PI suggest that their combined assessment may be employed as a tenable surrogate to non-invasively measure ICP when the invasive measure of ICP is unfeasible.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Scholarship at UWind...arrow_drop_down
    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Scholarship at UWindsor
    Thesis . 2022
    License: CC BY
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Scholarship at UWind...arrow_drop_down
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
      Scholarship at UWindsor
      Thesis . 2022
      License: CC BY
  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Eyrich, Charles Beaufort;

    The exchange stiffness, Aex, is one of the key parameters controlling magnetization reversal in magnetic materials but is very difficult to measure, especially in thin films. We developed a new technique for measuring the exchange stiffness of a magnetic material based on the formation of a spin spiral within two antiferromagnetically coupled ferromagnetic films [1]. Using this method, I was able to measure the exchange stiffness of thin film Co alloyed with Cr, Fe, Ni, Pd, Pt and Ru. The results of this work showed that the rate at which a substituent element reduces the exchange stiffness is not directly related to its effect on the magnetization of the alloy. These measured trends have been understood by combining measurements of element specific magnetic moments obtained using X-ray magnetic circular dichroism (XMCD) and material specific modeling based on density functional theory (DFT) within the local density approximation (LDA). The experimental results also hint at significant reduction of the exchange stiffness at the interface that can account for the difference between our results and those obtained on bulk materials.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Simon Fraser Univers...arrow_drop_down
    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Simon Fraser Univers...arrow_drop_down
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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    Authors: Roberti, Gioachino;

    Mount Meager is a glacier-clad volcanic complex in British Columbia, Canada. It is known for its landslides, of which the 2010 is the largest Canadian historical landslide. In this thesis we investigated slope instability processes at Mount Meager volcano and the effects of ongoing deglaciation. We used a variety of methods including field and remote, geological, geomorphological and structural mapping to characterize glacial and landslide activity at Mount Meager. We used Structure from Motion photogrammetry (SfM) and Lidar to produce digital surface models and InSAR to monitor slope deformation. We applied SfM to historic photography to document glacier and landslide activity at Mount Meager. We discussed a model of growth and erosion of a volcano in glacial and interglacial periods, and the scientific and dissemination value of historic 3D topographic reconstruction. We described the 2010 Mount Meager landslide deposit to interpret emplacement dynamics and kinematics. The 2010 landslide separated in water-rich and water-poor phases that had different runout and distinct deposits. We analyzed historic airphotos to constrain the slope deformation prior to the 2010 collapse. The glacier near the toe of the slope retreated in the failure lead up, the collapse evolved in four subfailures involving the whole volcanic sequence and some basement rocks. We estimated 6 × 106 m3 of water in the slope, that allowed the separation of the frontal water-rich phase. The total failure volume was 53 ± 3.8 × 106 m3. We identified 27 large (>5×105 m2) unstable slopes at Mount Meager and calculated ~1.3 km3 of ice loss since 1987. The west flank of Plinth peak and Devastation Creek valley moved up to -34±10 mm and -36±10 mm, respectively, over a 24-day period during the summer of 2016. The failure of these slopes could impact infrastructures and communities downstream of the volcano. The resulting decompression on the volcanic edifice after the failure of Plinth peak would affect the stress field to a depth of 6 km and up to 4 MPa. This sudden decompression could lead to hydrothermal or magmatic eruptions.; Mount Meager est un complexe volcanique glaciaire en British Columbia (Canada). Il est connu pour ses glissements de terrain, dont celui de 2010 étant le plus grand glissement de terrain historique au Canada. Dans cette thèse, nous avons étudié les processus d'instabilités du volcan Mont Meager ainsi que les effets de la déglaciation en cours. Nous avons utilisé une approche pluridisciplinaire, intégrant la cartographie géologique, géomorphologique et structurelle, du terrain et de la télédétection, pour caractériser l'activité glaciaire et les glissements de terrain au Mount Meager. Nous avons utilisé la photogrammétrie Structure from Motion (SfM) et la technologie Lidar pour produire des modèles numériques de terrain, et techniques InSAR pour surveiller le mouvement et la déformation des pentes du volcan. Nous avons appliqué la technique SfM à des photographies aériennes historiques pour documenter les activités des glaciers et des glissements de terrain au Mount Meager. Nous avons discuté un modèle de croissance et d'érosion d'un volcan en période glaciaire et interglaciaire, ainsi que la valeur scientifique et de vulgarisation de la reconstruction topographique 3D. Nous avons décrit les dépôts de glissement de terrain de 2010 à Mount Meager pour interpréter la dynamique de leur mise en place. Le glissement de terrain de 2010 s'est divisé en phases riches en eau et pauvres en eau, ayant des distances d'écoulement différentes et des dépôts distincts. Nous avons analysé des photographies aériennes historiques remontant à 1948, afin de documenter la déformation de la pente avant l'effondrement de 2010. Le glacier situé a proximité du pied de la pente a reculé durant les années précédents la rupture. Cette effondrement a évolué en quatre sous-effondrements, impliquant toute la séquence volcanique et le socle. Nous avons estimé 6 × 106 m3 d'eau dans la pente, ce qui a permis la séparation de la phase frontale riche en eau. Le volume total d'effondrement est 53 ± 3.8 × 106 m3. Nous avons identifié 27 grands (>5×105 m2) flancs instables au Mount Meager et calculé a ~1.3 km3 de récession des glaciers depuis 1987. Le flanc ouest de Plinth Peak et de la vallée de Devastation Creek se sont déplacés de -34±10 mm -36±10 mm, respectivement, dans un période de 24 jours pendant l'été 2016. L’effondrement de ces flancs pourrait avoir un impact important sur les infrastructures et les communautés en aval du volcan. La décompression résultant de l'édifice volcanique après l'effondrement du flanc ouest de Plinth Peak affecterait le champ de contrainte à une profondeur de 6 km et jusqu'à 4 MPa. Cette décompression soudaine pourrait mener des éruptions hydrothermales et magmatiques. Un important glissement de terrain pourrait donc avoir joué un rôle dans le déclenchement de l'éruption de 2360 cal BP.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Simon Fraser Univers...arrow_drop_down
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    Hal-Diderot
    Doctoral thesis . 2018
    Data sources: Hal-Diderot
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      Hal-Diderot
      Doctoral thesis . 2018
      Data sources: Hal-Diderot
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    Authors: Kervazo, Sophie;

    The main question of this thesis is: do we have today the tools to efficiently describe the structure, the bonding and the thermodynamics of actinide systems? This broad question is answered thanks to three studies. The first two are directly applied to the plastic industry and the nuclear plant safety. The last one, more fundamental, concerns the benchmarking of newly developed theoretical approach on f-elementsystems.First, actinides and transition metal arene-coordinated alkyl cations have been recently proven to be efficient catalysts for ethylene polymerizations. Interestingly, thorium, uranium and zirconium alkyl cations catalytic activity depends on the solvent. To understand these behaviours and to confirm the tendency of these complexes to engage in unusual-arene coordination, relativistic DFT calculations combined with a characterization of the interaction thanks to the ETS-NOCV method are used.Second, in accident scenario along the reprocessing of spent nuclear fuel, plutonium can be released in various volatile forms (PuO2, PuO3 or PuO2(OH)2, ...). The exploration of these scenarios by the use of simulations requires, among the various parameters, the knowledge of the thermodynamic properties of the possibly formed elements. Our in-silico study focusses on the determination of the enthalpies of formationof the former two species for which experimental uncertainties remain, using multi-configurational relativistic wavefunction method. The last part of the thesis focusses on the benchmark of the B2-PLYP functional for f-element systems, which turns out quite accurate with respect to the experimental data and the gold-standard CCSD(T) method. La question générale traitée dans cette thèse est de déterminer si, aujourd’hui, nous disposons d’outils théoriques efficaces pour d’écrire la structure, la liaison et les propriétés thermodynamiques de système comprenant un actinide. Cette large question va être abordée à l’aide de trois études différentes. Les deux premières sont directement liées à l’industrie plastique et à la sureté nucléaire. La dernière, plus fondamentale concerne une analyse comparative d’une approche théorique nouvellement développée sur des systèmes comprenant des éléments f.Tout d’abord, les cations alkyles contenant un actinide (Th, U) ou un métal de transition (Zr) coordonné à un arène se sont révélés efficaces pour la catalyse de la synthèse du polyéthylène. Étonnamment, les activités catalytiques des cations alkyles dépendent du solvant. Pour comprendre cela et confirmer la tendance qu'ont ces complexes à se lier à l’arène, une étude en DFT dans un contexte relativiste combinée à une caractérisation de liaison avec la méthode ETS-NOCV fut faite.La deuxième étude vise à étoffer les bases de données thermodynamiques qui servent à explorer numériquement les scénarios d’accidents. Notre étude in silico porte sur la détermination des enthalpies de formation des deux espèces pour lesquelles des incertitudes expérimentales subsistent (PuO2, PuO3 or PuO2(OH)2, ...), en utilisant une méthode quantique multiconfigurationnelle et relativiste.La dernière partie de la théorie se concentre sur l’estimation de la précision de la fonctionnelle B2-PLYP pour les éléments f, qui s'avère assez précise en comparaison aux données expérimentales et à la méthode de référence CCSD(T).

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    MacSphere
    Thesis . 2018
    Data sources: MacSphere
    Hal-Diderot
    Doctoral thesis . 2018
    Data sources: Hal-Diderot
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      MacSphere
      Thesis . 2018
      Data sources: MacSphere
      Hal-Diderot
      Doctoral thesis . 2018
      Data sources: Hal-Diderot
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    Authors: Zhai, Yuanyuan;

    A Thesis Submitted to the Faculty of Graduate Studies and Research In Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy in Environmental Systems Engineering, University of Regina. xvii, 185 p. Temperature extremes are among the most studied features in the climate research community using both the observed datasets and the simulated outputs from climate models. Such extremes often lead to irreversible societal, ecological, and economic consequences across the globe. Moreover, projected results from climate models have also indicated that changes in future temperature-related extremes will become more frequent and intense with global warming. Therefore, comprehensive knowledge of long-term changes in the observed temperature extremes cannot only help to detect, attribute, and project climate change but can also enhance the development of effective mitigation and adaptation strategies (at regional or site-specific scales) towards the management of catastrophe caused by the extremes. In this dissertation, the observed spatial and temporal variations in temperature extremes are first analyzed at a hemispheric scale based on the newly developed HadEX3 dataset; the impact of large-scale atmospheric circulation patterns on dynamic changes in temperature extremes has also been examined. Then, future changes in extreme temperature variables at a much smaller scale (e.g., local scale) are investigated through a stepwise clustered downscaling method. Based on the downscaled results, future changes in the properties of moderate and severe heatwave conditions are further analyzed. Comparisons of the projected temperature variables and future heatwaves among different climate models provide valuable information on the ability of the models in simulating the long-term variations of temperature extremes. This research can be used to provide a scientific basis and valuable information to prepare for future changes in extreme heat conditions and mitigate the negative impacts of temperature-related extremes on society and the environment. Student yes

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    oURspace
    Thesis . 2022
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    Authors: Knorr, Savannah;

    Southwestern Ontario is dominated by agricultural lands that are extensively tile drained throughout the region as a management practice to remove excess water from fields. While tile drainage is a common practice, the implementation of constructed preferential flow paths, along with surface runoff from agricultural lands, increases nutrient loading risks to connected and downstream environments, and receiving large lakes. Of particular concern in this region is Lake Erie which has a legacy of severely degraded water quality due to excess nutrient loading from agricultural lands within the lake’s drainage basin. While agricultural lands are a known source for nutrient loading, there is a lack of understanding on the role of microbial functional communities in environments connected to these lands, and how they respond to both nutrient inputs and agricultural management practices. This thesis investigates how sustained agricultural management practices alter microbial nutrient cycling communities in receiving aquatic and sediment environments, and the temporal patterns in both nutrient loading and microbial nutrient cycling communities. Results indicate that fertilization practices and agricultural management practices (e.g. tillage), increase nutrient loads to receiving environments. Nitrogen fertilization in particular drives patterns in nitrogen and phosphorus limited conditions in receiving aquatic environments, and phosphorus limited conditions of both aquatic and sediment environments determines patterns in phosphorus mobilization potentials. Finally, nutrient loads and microbial nutrient cycling capacity in aquatic environments increase during precipitation events and in the non-growing season, but decline significantly with increasing distance from agricultural sources and through areas of natural filtration. In contrast sediment environments are more resilient to agricultural inputs and abiotic factors. This research provides insight into temporal patterns of nutrient loading and how nutrient cycling microbial communities respond in receiving aquatic and sediment environments in agriculturally dominated locations of the southwestern Ontario region.

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    Scholarship at UWindsor
    Thesis . 2023
    License: CC BY
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    Scholarship at UWindsor
    Thesis . 2023
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      Scholarship at UWindsor
      Thesis . 2023
      License: CC BY
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      Scholarship at UWindsor
      Thesis . 2023
      License: CC BY
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281 Research products
  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Cong, Binghao;

    The primary objective of this thesis is to improve optical setups of a constant volume combustion chamber to better understand the vaporization and spray characteristics of various fuels. The schlieren imaging technique is utilized to visualize phenomena that are challenging to observe directly. In this thesis, the schlieren imaging is used to observe the spray and ignition characteristics of DME and diesel fuels under high injection pressure. First, various optical techniques are discussed and compared under the same test condition including schlieren, shadowgraph, and direct imaging. The advantages for these techniques are presented and the most appropriate technique for different testing scenarios is proposed. Second, the spray and ignition characteristics of DME and diesel are compared. The inert spray for both fuels are observed and compared using schlieren imaging technique. The reactive spray for both fuels are observed and compared using direct imaging and shadowgraph imaging system.

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    Scholarship at UWindsor
    Thesis . 2023
    License: CC BY
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      Scholarship at UWindsor
      Thesis . 2023
      License: CC BY
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    Authors: Alexander, Nicolle;

    More than two decades after its introduction, neoliberal ideology has increasingly created a class and race-based gap in relation to student achievement in Ontario’s education system. Due to market-based rhetoric shaping policies and legislation, schools are increasingly encouraging students to adhere to the demands of a newly globalized world with a focus on the economy, regardless of their background. This study aims to analyze the presence of neoliberal reforms in Ontario’s education system through decisions made in government from Mike Harris’ in 1995 to the present Doug Ford administration. Specifically, I investigate how the so-called knowledge economy has produced a system that enables students deemed marketable, often from middle- and upper-class white backgrounds, and disables non-marketable students, most often the working poor and the working class, and racial and ethnic minorities, through funding cuts, heightened accountability, and standardized testing. By evaluating Ministry of Education policy documents and documents for both Conservative Premier campaigns, I analyzed the rhetoric used to introduce, consolidate and solidify neoliberal discourse throughout the past twenty years. The results showed that by simplifying education to quantifiable measures, the education system now measures concepts such as equity and inclusion in schools through standardized testing and monthly reports. Further, the rhetoric used to solidify equity and inclusion within the system focuses more on the presentation of both rather than materializing its action in schools. In order to minimize the current student achievement gap in our education system, funding needs to be focalized in social services cut by our government level to properly re“instate” the intended actions of these policies.

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    Authors: Rana, Shivang;

    The rarity of Melanoma skin cancer accounts for the dataset collected to be limited and highly skewed, as benign moles can easily mimic the impression of the melanoma-affected area. Such an imbalanced dataset makes training any deep learning classifier network harder by affecting the training stability. We have an intuition that synthesizing such skin lesion medical images could help solve the issue of overfitting in training networks and assist in enforcing the anonymization of actual patients. Despite multiple previous attempts, none of the models were practical for the fast-paced clinical environment. In this thesis, we propose a novel pipeline named SkinCAN AI, inspired by StyleGAN but designed explicitly considering the limitations of the skin lesion dataset and emphasizing the requirement of a faster optimized diagnostic tool that can be easily inferred and integrated into the clinical environment. Our SkinCAN AI model is equipped with its module of adaptive discriminator augmentation that enables limited target data distribution to be learned and artificial data points to be sampled, which further assist the classifier network in learning semantic features. We elucidate the novelty of our SkinCAN AI pipeline by integrating the soft attention module in the classifier network. This module yields an attention mask analyzed by DenseNet201 to focus on learning relevant semantic features from skin lesion images without using any heavy computational burden of artifact removal software. The SkinGAN model achieves an FID score of 0.622 while allowing its synthetic samples to train the DenseNet201 model with an accuracy of 0.9494, AUC of 0.938, specificity of 0.969, and sensitivity of 0.695. We provide evidence in our thesis that our proposed pipelines outperform other state-of-the-art existing networks developed for this task of early diagnosis.

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    Scholarship at UWindsor
    Thesis . 2022
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      Scholarship at UWindsor
      Thesis . 2022
      License: CC BY
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    Authors: Edrisy, Mohamed;

    The emergence of commercial FEA solvers was a significant breakthrough that boosted the accuracy and complexity of engineering design. While composite materials are special materials, their mechanical properties can be custom made by considering the needs and requirements of the design problem. Given the rapidly expanding global consumption of composite materials, access to FEA solvers capable of assigning these materials is an absolute requirement.The CATIA software is a platform for designing, analyzing, and manufacturing of parts. However, there is no meaningful documentation in the public domain exploring the finite element functionalities of CATIA software for composite materials. Isotropic materials are used in numerous references investigating the CATIA FEA solver; however, the extension to composite materials has been lacking. The present study investigates two phenomena: (1) the procedure to import composite material properties into the Generative Structural Analysis workbench, and (2) the pre-processing and the post-processing toolbars and functionalities pertaining to this matter. The thesis does not address the CAD modelling aspects of the composites per se since there are many references available concentrating on such issues in the CATIA public literature.The composite models are selected from different scenarios labeled as benchmark problems. The results generated by CATIA’s native FEA solver for the static, dynamic, and buckling cases are compared with other tools available to the engineering community. These tools encompass the Classical Lamination Theory and two commercial CAE codes, known as ABAQUS and ANSYS.

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    Authors: Stone, Rachel Marie;

    Monitoring intracranial pressure (ICP) has become an important practice in patients with elevated ICP (e.g., traumatic brain injury) to improve patient outcome. However, little information exists surrounding chronic, but sub-clinical elevations in ICP, which may stem from classic cardiovascular risk factors, such as elevated blood pressure (BP). The current methods to assess ICP are invasive and costly; but optic nerve sheath diameter (ONSD) and blood flow pulsatility (pulsatility index; PI) are promising non-invasive techniques, both of which have been reported to strongly correlate with invasive measures of ICP in pathology. However, the interactions of BP, ONSD and PI in otherwise healthy adults, remains undetermined. Accordingly, the purpose of this investigation was to determine the relationship between ONSD, PI and BP, and to highlight possible sex differences in a population of young healthy adults. Sixteen participants (6 females) underwent assessment of arterial BP, ONSD (left and right eyes) and PI (left common carotid artery) using ultrasound. There was a strong correlation between mean ONSD (left and right eye combined) and PI (R=0.735, p=0.001). There was no significant relationship between PI and BP (R=0.058, p=0.832) or ONSD and BP (R=0.272, p=0.309). Additionally, there was a significant difference between males and females for mean ONSD, whereby males demonstrated a larger diameter (males=0.4860.110 vs. females=0.3530.062cm; p=0.018), but there was no significant difference in PI between males and females (males=2.3630.613 vs. females=1.9500.196; p=0.136). Results of this study confirm the relationship between ONSD and PI in a healthy population. While ICP was not directly assessed in the current study, the strong associations between ONSD and PI suggest that their combined assessment may be employed as a tenable surrogate to non-invasively measure ICP when the invasive measure of ICP is unfeasible.

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    Scholarship at UWindsor
    Thesis . 2022
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      Scholarship at UWindsor
      Thesis . 2022
      License: CC BY
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    Authors: Eyrich, Charles Beaufort;

    The exchange stiffness, Aex, is one of the key parameters controlling magnetization reversal in magnetic materials but is very difficult to measure, especially in thin films. We developed a new technique for measuring the exchange stiffness of a magnetic material based on the formation of a spin spiral within two antiferromagnetically coupled ferromagnetic films [1]. Using this method, I was able to measure the exchange stiffness of thin film Co alloyed with Cr, Fe, Ni, Pd, Pt and Ru. The results of this work showed that the rate at which a substituent element reduces the exchange stiffness is not directly related to its effect on the magnetization of the alloy. These measured trends have been understood by combining measurements of element specific magnetic moments obtained using X-ray magnetic circular dichroism (XMCD) and material specific modeling based on density functional theory (DFT) within the local density approximation (LDA). The experimental results also hint at significant reduction of the exchange stiffness at the interface that can account for the difference between our results and those obtained on bulk materials.

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    Authors: Roberti, Gioachino;

    Mount Meager is a glacier-clad volcanic complex in British Columbia, Canada. It is known for its landslides, of which the 2010 is the largest Canadian historical landslide. In this thesis we investigated slope instability processes at Mount Meager volcano and the effects of ongoing deglaciation. We used a variety of methods including field and remote, geological, geomorphological and structural mapping to characterize glacial and landslide activity at Mount Meager. We used Structure from Motion photogrammetry (SfM) and Lidar to produce digital surface models and InSAR to monitor slope deformation. We applied SfM to historic photography to document glacier and landslide activity at Mount Meager. We discussed a model of growth and erosion of a volcano in glacial and interglacial periods, and the scientific and dissemination value of historic 3D topographic reconstruction. We described the 2010 Mount Meager landslide deposit to interpret emplacement dynamics and kinematics. The 2010 landslide separated in water-rich and water-poor phases that had different runout and distinct deposits. We analyzed historic airphotos to constrain the slope deformation prior to the 2010 collapse. The glacier near the toe of the slope retreated in the failure lead up, the collapse evolved in four subfailures involving the whole volcanic sequence and some basement rocks. We estimated 6 × 106 m3 of water in the slope, that allowed the separation of the frontal water-rich phase. The total failure volume was 53 ± 3.8 × 106 m3. We identified 27 large (>5×105 m2) unstable slopes at Mount Meager and calculated ~1.3 km3 of ice loss since 1987. The west flank of Plinth peak and Devastation Creek valley moved up to -34±10 mm and -36±10 mm, respectively, over a 24-day period during the summer of 2016. The failure of these slopes could impact infrastructures and communities downstream of the volcano. The resulting decompression on the volcanic edifice after the failure of Plinth peak would affect the stress field to a depth of 6 km and up to 4 MPa. This sudden decompression could lead to hydrothermal or magmatic eruptions.; Mount Meager est un complexe volcanique glaciaire en British Columbia (Canada). Il est connu pour ses glissements de terrain, dont celui de 2010 étant le plus grand glissement de terrain historique au Canada. Dans cette thèse, nous avons étudié les processus d'instabilités du volcan Mont Meager ainsi que les effets de la déglaciation en cours. Nous avons utilisé une approche pluridisciplinaire, intégrant la cartographie géologique, géomorphologique et structurelle, du terrain et de la télédétection, pour caractériser l'activité glaciaire et les glissements de terrain au Mount Meager. Nous avons utilisé la photogrammétrie Structure from Motion (SfM) et la technologie Lidar pour produire des modèles numériques de terrain, et techniques InSAR pour surveiller le mouvement et la déformation des pentes du volcan. Nous avons appliqué la technique SfM à des photographies aériennes historiques pour documenter les activités des glaciers et des glissements de terrain au Mount Meager. Nous avons discuté un modèle de croissance et d'érosion d'un volcan en période glaciaire et interglaciaire, ainsi que la valeur scientifique et de vulgarisation de la reconstruction topographique 3D. Nous avons décrit les dépôts de glissement de terrain de 2010 à Mount Meager pour interpréter la dynamique de leur mise en place. Le glissement de terrain de 2010 s'est divisé en phases riches en eau et pauvres en eau, ayant des distances d'écoulement différentes et des dépôts distincts. Nous avons analysé des photographies aériennes historiques remontant à 1948, afin de documenter la déformation de la pente avant l'effondrement de 2010. Le glacier situé a proximité du pied de la pente a reculé durant les années précédents la rupture. Cette effondrement a évolué en quatre sous-effondrements, impliquant toute la séquence volcanique et le socle. Nous avons estimé 6 × 106 m3 d'eau dans la pente, ce qui a permis la séparation de la phase frontale riche en eau. Le volume total d'effondrement est 53 ± 3.8 × 106 m3. Nous avons identifié 27 grands (>5×105 m2) flancs instables au Mount Meager et calculé a ~1.3 km3 de récession des glaciers depuis 1987. Le flanc ouest de Plinth Peak et de la vallée de Devastation Creek se sont déplacés de -34±10 mm -36±10 mm, respectivement, dans un période de 24 jours pendant l'été 2016. L’effondrement de ces flancs pourrait avoir un impact important sur les infrastructures et les communautés en aval du volcan. La décompression résultant de l'édifice volcanique après l'effondrement du flanc ouest de Plinth Peak affecterait le champ de contrainte à une profondeur de 6 km et jusqu'à 4 MPa. Cette décompression soudaine pourrait mener des éruptions hydrothermales et magmatiques. Un important glissement de terrain pourrait donc avoir joué un rôle dans le déclenchement de l'éruption de 2360 cal BP.

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    Hal-Diderot
    Doctoral thesis . 2018
    Data sources: Hal-Diderot
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      Hal-Diderot
      Doctoral thesis . 2018
      Data sources: Hal-Diderot
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    Authors: Kervazo, Sophie;

    The main question of this thesis is: do we have today the tools to efficiently describe the structure, the bonding and the thermodynamics of actinide systems? This broad question is answered thanks to three studies. The first two are directly applied to the plastic industry and the nuclear plant safety. The last one, more fundamental, concerns the benchmarking of newly developed theoretical approach on f-elementsystems.First, actinides and transition metal arene-coordinated alkyl cations have been recently proven to be efficient catalysts for ethylene polymerizations. Interestingly, thorium, uranium and zirconium alkyl cations catalytic activity depends on the solvent. To understand these behaviours and to confirm the tendency of these complexes to engage in unusual-arene coordination, relativistic DFT calculations combined with a characterization of the interaction thanks to the ETS-NOCV method are used.Second, in accident scenario along the reprocessing of spent nuclear fuel, plutonium can be released in various volatile forms (PuO2, PuO3 or PuO2(OH)2, ...). The exploration of these scenarios by the use of simulations requires, among the various parameters, the knowledge of the thermodynamic properties of the possibly formed elements. Our in-silico study focusses on the determination of the enthalpies of formationof the former two species for which experimental uncertainties remain, using multi-configurational relativistic wavefunction method. The last part of the thesis focusses on the benchmark of the B2-PLYP functional for f-element systems, which turns out quite accurate with respect to the experimental data and the gold-standard CCSD(T) method. La question générale traitée dans cette thèse est de déterminer si, aujourd’hui, nous disposons d’outils théoriques efficaces pour d’écrire la structure, la liaison et les propriétés thermodynamiques de système comprenant un actinide. Cette large question va être abordée à l’aide de trois études différentes. Les deux premières sont directement liées à l’industrie plastique et à la sureté nucléaire. La dernière, plus fondamentale concerne une analyse comparative d’une approche théorique nouvellement développée sur des systèmes comprenant des éléments f.Tout d’abord, les cations alkyles contenant un actinide (Th, U) ou un métal de transition (Zr) coordonné à un arène se sont révélés efficaces pour la catalyse de la synthèse du polyéthylène. Étonnamment, les activités catalytiques des cations alkyles dépendent du solvant. Pour comprendre cela et confirmer la tendance qu'ont ces complexes à se lier à l’arène, une étude en DFT dans un contexte relativiste combinée à une caractérisation de liaison avec la méthode ETS-NOCV fut faite.La deuxième étude vise à étoffer les bases de données thermodynamiques qui servent à explorer numériquement les scénarios d’accidents. Notre étude in silico porte sur la détermination des enthalpies de formation des deux espèces pour lesquelles des incertitudes expérimentales subsistent (PuO2, PuO3 or PuO2(OH)2, ...), en utilisant une méthode quantique multiconfigurationnelle et relativiste.La dernière partie de la théorie se concentre sur l’estimation de la précision de la fonctionnelle B2-PLYP pour les éléments f, qui s'avère assez précise en comparaison aux données expérimentales et à la méthode de référence CCSD(T).

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    MacSphere
    Thesis . 2018
    Data sources: MacSphere
    Hal-Diderot
    Doctoral thesis . 2018
    Data sources: Hal-Diderot
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      MacSphere
      Thesis . 2018
      Data sources: MacSphere
      Hal-Diderot
      Doctoral thesis . 2018
      Data sources: Hal-Diderot
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    Authors: Zhai, Yuanyuan;

    A Thesis Submitted to the Faculty of Graduate Studies and Research In Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy in Environmental Systems Engineering, University of Regina. xvii, 185 p. Temperature extremes are among the most studied features in the climate research community using both the observed datasets and the simulated outputs from climate models. Such extremes often lead to irreversible societal, ecological, and economic consequences across the globe. Moreover, projected results from climate models have also indicated that changes in future temperature-related extremes will become more frequent and intense with global warming. Therefore, comprehensive knowledge of long-term changes in the observed temperature extremes cannot only help to detect, attribute, and project climate change but can also enhance the development of effective mitigation and adaptation strategies (at regional or site-specific scales) towards the management of catastrophe caused by the extremes. In this dissertation, the observed spatial and temporal variations in temperature extremes are first analyzed at a hemispheric scale based on the newly developed HadEX3 dataset; the impact of large-scale atmospheric circulation patterns on dynamic changes in temperature extremes has also been examined. Then, future changes in extreme temperature variables at a much smaller scale (e.g., local scale) are investigated through a stepwise clustered downscaling method. Based on the downscaled results, future changes in the properties of moderate and severe heatwave conditions are further analyzed. Comparisons of the projected temperature variables and future heatwaves among different climate models provide valuable information on the ability of the models in simulating the long-term variations of temperature extremes. This research can be used to provide a scientific basis and valuable information to prepare for future changes in extreme heat conditions and mitigate the negative impacts of temperature-related extremes on society and the environment. Student yes

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    oURspace
    Thesis . 2022
    Data sources: oURspace
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    Authors: Knorr, Savannah;

    Southwestern Ontario is dominated by agricultural lands that are extensively tile drained throughout the region as a management practice to remove excess water from fields. While tile drainage is a common practice, the implementation of constructed preferential flow paths, along with surface runoff from agricultural lands, increases nutrient loading risks to connected and downstream environments, and receiving large lakes. Of particular concern in this region is Lake Erie which has a legacy of severely degraded water quality due to excess nutrient loading from agricultural lands within the lake’s drainage basin. While agricultural lands are a known source for nutrient loading, there is a lack of understanding on the role of microbial functional communities in environments connected to these lands, and how they respond to both nutrient inputs and agricultural management practices. This thesis investigates how sustained agricultural management practices alter microbial nutrient cycling communities in receiving aquatic and sediment environments, and the temporal patterns in both nutrient loading and microbial nutrient cycling communities. Results indicate that fertilization practices and agricultural management practices (e.g. tillage), increase nutrient loads to receiving environments. Nitrogen fertilization in particular drives patterns in nitrogen and phosphorus limited conditions in receiving aquatic environments, and phosphorus limited conditions of both aquatic and sediment environments determines patterns in phosphorus mobilization potentials. Finally, nutrient loads and microbial nutrient cycling capacity in aquatic environments increase during precipitation events and in the non-growing season, but decline significantly with increasing distance from agricultural sources and through areas of natural filtration. In contrast sediment environments are more resilient to agricultural inputs and abiotic factors. This research provides insight into temporal patterns of nutrient loading and how nutrient cycling microbial communities respond in receiving aquatic and sediment environments in agriculturally dominated locations of the southwestern Ontario region.

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