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apps Other research product2023 Canada EnglishAuthors: Despeines, Yadhiera;Despeines, Yadhiera;All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=od______1875::4285bf0dd3d69fe9e4d7086af613f78d&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu0 citations 0 popularity Average influence Average impulse Average Powered by BIP!more_vert All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=od______1875::4285bf0dd3d69fe9e4d7086af613f78d&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euapps Other research product2023 Canada EnglishAuthors: Mendoza, Paulene;Mendoza, Paulene;All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=od______1875::ac24da90825a8e6e5aedb7f03399ec2e&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu0 citations 0 popularity Average influence Average impulse Average Powered by BIP!more_vert All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=od______1875::ac24da90825a8e6e5aedb7f03399ec2e&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euapps Other research productkeyboard_double_arrow_right Other ORP type 2023 Canada EnglishAuthors: Gao, Zhiyuan;Gao, Zhiyuan;handle: 1993/37415
Mercury is a contaminant of global concern. It is present widely in global ecosystems and its methylated species is a known developmental neurotoxin to humans. The fate and behaviour of mercury in the environment are largely affected by its speciation, especially among different oxidation states controlled by redox chemistry. Mercury redox chemistry is the key chemical mechanism mediating the transport of the contaminant, yet it has not been well represented in global and regional mercury transport models. Most models rely heavily on computational data to parameterize mercury redox chemistry, and large discrepancies have been reported between the model parameters and experimental results. In this thesis, several critically important mercury redox processes in the atmosphere and marine cryosphere are investigated experimentally in laboratory, mesocosm and field studies. In the atmosphere, in-cloud mercury photoreduction is found to occur at rates that are much slower than those currently used in models, questioning the presumed dominance of the aqueous-phase reduction in the atmosphere. Mercury redox reactions are also studied in an outdoor sea ice mesocosm. At the atmosphere-sea ice interface, saline surfaces of experimental sea ice are shown to support heterogenous photochemical reactions causing the depletion of gaseous elemental mercury in the atmospheric boundary layer; whereas at the sea ice-seawater interface, cryo-photochemical processes could cause the decrease in the concentrations of dissolved gaseous mercury during the formation of sea ice. Overall, the results from this thesis research provide new and important concepts and experimental datasets to the mercury redox mechanism during its geochemical cycle. The results will advance model parametrizations on mercury redox chemistry and improve future projections of mercury cycling in the atmosphere and the Arctic marine cryosphere, which are especially important under a rapidly changing environment. Furthermore, the results also validate the mesocosm approach on studying cryo-photochemical processes in the sea ice environment, which opens up a new platform to study the geochemistry of other contaminants in the marine cryosphere.
MSpace at the Univer... arrow_drop_down MSpace at the University of ManitobaOther ORP type . 2023Data sources: MSpace at the University of Manitobaadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eu0 citations 0 popularity Average influence Average impulse Average Powered by BIP!more_vert MSpace at the Univer... arrow_drop_down MSpace at the University of ManitobaOther ORP type . 2023Data sources: MSpace at the University of Manitobaadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=1993/37415&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euapps Other research product2022 Canada EnglishAuthors: Iligan, Sandy;Iligan, Sandy;All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=od______1875::5e3f5d3cef623da88937f39c699bfda0&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu0 citations 0 popularity Average influence Average impulse Average Powered by BIP!more_vert All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=od______1875::5e3f5d3cef623da88937f39c699bfda0&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euapps Other research product2022 Canada EnglishAuthors: Khoshrou, Ali; Ince, Ayhan;Khoshrou, Ali; Ince, Ayhan;Crack-tip stress evaluation requires special treatments in the frame of classical elasticity theory for characterizing fatigue crack growth behavior. In previous studies, modified finite element methods have been used to remedy infinite stresses predicted by the classical elasticity theory at the tip of a crack. Peridynamics, as a recently developed non-local theory, has proved to be a powerful mathematical modeling approach to overcome the limitations of continuum mechanics e.g. analyzing discontinuous problems such as cracks without utilizing special treatments/functions or additional crack behavior criteria. In this study, a state-based peridynamics modeling approach is developed to model and simulate displacement and stress fields around a hole and crack shape geometry in a steel plate structure. The peridynamics model is first used to simulate displacement and stress fields for a central hole in a plate under the uniform tension. Furthermore, it is also shown that the peridynamics approach provides high accuracies in modeling displacement and stress fields for sharp elliptical-shaped crack geometry. Part of the Proceedings of the Canadian Society for Mechanical Engineering International Congress 2022.
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For further information contact us at helpdesk@openaire.eu0 citations 0 popularity Average influence Average impulse Average Powered by BIP!more_vert All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=od______1875::c00aaef570b94289f95a5d5d58a40f60&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euapps Other research product2021 Canada EnglishAuthors: Lu, Chang; Jin, Zhehui; Li, Huazhou; Xu, Lingfei;Lu, Chang; Jin, Zhehui; Li, Huazhou; Xu, Lingfei;Two-phase and three-phase equilibria are frequently encountered in a variety of industrial processes, such as carbon dioxide (CO2) injection for enhanced oil recovery in oil reservoirs, multiphase separation in surface separators, and multiphase flow in wellbores and pipelines. Simulation and engineering design of these processes using isothermal/isochoric (VT) multiphase equilibrium algorithms are sometimes more convenient than that using the conventional isothermal/isobaric (PT) algorithms. This work develops a robust algorithm for VT multiphase equilibrium calculations using a nested approach. The proposed algorithm is simple because a robust PT multiphase equilibrium algorithm is used in the inner loop without any further modifications, while an effective equation-solving method (i.e., Brent’s method; Brent 1971) is applied in the outer loop to solve the pressure corresponding to a given volume/temperature specification. The robustness of the VT algorithm is safeguarded by using a highly efficient trust-region-method-based PT algorithm. We demonstrate the good performance of the newly developed algorithm by applying it to calculate the isochores of fluid mixtures that exhibit both two-phase and three-phaseequilibria.
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For further information contact us at helpdesk@openaire.eu0 citations 0 popularity Average influence Average impulse Average Powered by BIP!more_vert All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=od______1875::0022e2f640ddd38ee5ea2b4be03bb885&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euapps Other research productkeyboard_double_arrow_right Other ORP type 2020 Canada EnglishPublisher:Elsevier BV Authors: Hudson, Rebecca; Faraj, Fouad; Fotopoulos, Georgia;Hudson, Rebecca; Faraj, Fouad; Fotopoulos, Georgia;handle: 1974/28009
The morphological study of geological hand samples has a wide variety of applications in the geosciences, which is conventionally accomplished by measuring the distance between features of interest on the sample’s surface. Close-range three-dimensional (3D) laser scanners provide an opportunity to study the form and shape of geological samples in a digital environment and have been increasingly utilized in fields such as paleontology, rock mechanics, and sedimentology, with some uptake in planetary sciences and structural geology. For paleontological studies, primary applications are in quantitative analysis of fossil morphology and integration into 3D animated models for understanding species movements. In the field of rock mechanics, typical uses of 3D digital geological hand sample models include quantifying joint roughness coefficient (JRC), determining the surface roughness of rock samples, and assessing morphological changes over time due to processes such as weathering. In the field of sedimentology, such models are incorporated to characterize the shape of sediment particles and to calculate key parameters such as bulk density. This paper aims to provide a comprehensive review of established literature that includes substantial use of digital geological hand samples acquired from 3D close-range (<1m target distance) triangulation laser scanners in an effort to identify opportunities for future progress (such as global data sharing) as well as challenges specific to the nature of geological samples (e.g., translucency) and geoscientific workflows (on and off-site).
add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eu0 citations 0 popularity Average influence Average impulse Average Powered by BIP!more_vert add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=1974/28009&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euapps Other research product2019 Canada EnglishGillard, Laura C.; Hu, Xianmin; Myers, Paul G.; Ribergaard, Mads Hvid; Lee, Craig M.;The oceanic heat available in Greenland’s troughs is dependent on the geographic location of the trough, the water origin, and how the water is impacted by local processes along the pathway to the trough. This study investigates the spatial pattern and quantity of the warm water (with a temperature greater −1.5◦C) brought to the shelf and into the troughs abutting the Greenland Ice Sheet (GrIS). An increase in ocean heat in these troughs may drive a retreat of the GrIS. Warm water that is exchanged from the trough into the fjord may influence the melt on the marine-terminating glaciers. Several regional ocean model experiments were used to study regional differences in heat transport through troughs. Results showed that warm water extends north into Baffin Bay, reaching as far north as the Melville Bay troughs. Melville Bay troughs experienced warming following 2009. From 2004 to 2006, model experiments captured an increase in onshore heat flux in the Disko Bay trough, coinciding with the timing of the disintegration of Jakobshavn Isbrae’s floating tongue and observed ocean heat increase in Disko Bay. The seasonality of the maximum onshore heat flux differs due to distance away from the Irminger Sea. Ocean temperatures near the northwestern coast and southeastern coast respond differently to changes in meltwater from Greenland and high-frequency atmospheric phenomena. With a doubling of the GrIS meltwater, Baffin Bay troughs transported ∼ 20 % more heat towards the coast. Fewer storms resulted in a doubling of onshore heat through Helheim Glacier’s trough. These results demonstrate the regional variability of onshore heat transport through troughs and its potential implications to the GrIS.
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For further information contact us at helpdesk@openaire.eu0 citations 0 popularity Average influence Average impulse Average Powered by BIP!more_vert All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=od______1875::1dbee6baf68f88987680fda420674d70&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euapps Other research product2019 Canada EnglishHayashida, Haskase; Christian, James R.; Holdsworth, Amber M.; Hu, Xianmin; Monahan, Adam H.; Mortenson, Eric; Myers, Paul G.; Riche, Olivier G. J.; Sou, Tessa; Steiner, Nadja S.;Process-based numerical models are a useful tool for studying marine ecosystems and associated biogeochemical processes in ice-covered regions where observations are scarce. To this end, CSIB v1 (Canadian Sea-ice Biogeochemistry version 1), a new sea-ice biogeochemical model, has been developed and embedded into the Nucleus for European Modelling of the Ocean (NEMO) modelling system. This model consists of a three-compartment (ice algae, nitrate, and ammonium) sea-ice ecosystem and a two-compartment (dimethylsulfoniopropionate and dimethylsulfide) sea-ice sulfur cycle which are coupled to pelagic ecosystem and sulfur-cycle models at the sea-ice–ocean interface. In addition to biological and chemical sources and sinks, the model simulates the horizontal transport of biogeochemical state variables within sea ice through a one-way coupling to a dynamic-thermodynamic sea-ice model (LIM2; the Louvain-la-Neuve Sea Ice Model version 2). The model results for 1979 (after a decadal spin-up) are presented and compared to observations and previous model studies for a brief discussion on the model performance. Furthermore, this paper provides discussion on technical aspects of implementing the sea-ice biogeochemistry and assesses the model sensitivity to (1) the temporal resolution of the snowfall forcing data, (2) the representation of light penetration through snow, (3) the horizontal transport of sea-ice biogeochemical state variables, and (4) light attenuation by ice algae. The sea-ice biogeochemical model has been developed within the generic framework of NEMO to facilitate its use within different configurations and domains, and can be adapted for use with other NEMO-based sub-models such as LIM3 (the Louvain-la-Neuve Sea Ice Model version 3) and PISCES (Pelagic Interactions Scheme for Carbon and Ecosystem Studies).
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For further information contact us at helpdesk@openaire.eu0 citations 0 popularity Average influence Average impulse Average Powered by BIP!more_vert All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=od______1875::6f5dae1e34277358b4db6dcb0e97649c&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euapps Other research productkeyboard_double_arrow_right Other ORP type 2018 Canada EnglishAuthors: Bamburak, Kimberley;Bamburak, Kimberley;handle: 1993/33418
This practicum examines the feasibility of cold-climate viticulture in southern Manitoba in light of ongoing climate change and establishes principles for sustainable viticulture appropriate to Manitoba’s geological conditions. As the climate continues to change, drastic changes will begin to occur within the wine industry. Regions that are currently suitable for production are likely to be subject to higher temperatures, more erratic precipitation and harsher weather. An opportunity exists within the Mowbray Plateau located in the Pembina River Valley, to establish a new type of agriculture in the Prairies—one that can grow and adapt as the climate changes. Prairie viticulture is feasible if done appropriately, utilizing sustainable landscape strategies such as planned cover crops, creating smaller microclimates, and planting according to terroir. These strategies can evolve alongside climate and microclimatic-specific research. This practicum demonstrates through case studies of existing cold-climate grape growers, and by research and design, that the Prairies could provide a healthy future for sustainable viticulture.
MSpace at the Univer... arrow_drop_down MSpace at the University of ManitobaOther ORP type . 2018Data sources: MSpace at the University of Manitobaadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eu0 citations 0 popularity Average influence Average impulse Average Powered by BIP!more_vert MSpace at the Univer... arrow_drop_down MSpace at the University of ManitobaOther ORP type . 2018Data sources: MSpace at the University of Manitobaadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
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apps Other research product2023 Canada EnglishAuthors: Despeines, Yadhiera;Despeines, Yadhiera;All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=od______1875::4285bf0dd3d69fe9e4d7086af613f78d&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu0 citations 0 popularity Average influence Average impulse Average Powered by BIP!more_vert All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=od______1875::4285bf0dd3d69fe9e4d7086af613f78d&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euapps Other research product2023 Canada EnglishAuthors: Mendoza, Paulene;Mendoza, Paulene;All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=od______1875::ac24da90825a8e6e5aedb7f03399ec2e&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu0 citations 0 popularity Average influence Average impulse Average Powered by BIP!more_vert All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=od______1875::ac24da90825a8e6e5aedb7f03399ec2e&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euapps Other research productkeyboard_double_arrow_right Other ORP type 2023 Canada EnglishAuthors: Gao, Zhiyuan;Gao, Zhiyuan;handle: 1993/37415
Mercury is a contaminant of global concern. It is present widely in global ecosystems and its methylated species is a known developmental neurotoxin to humans. The fate and behaviour of mercury in the environment are largely affected by its speciation, especially among different oxidation states controlled by redox chemistry. Mercury redox chemistry is the key chemical mechanism mediating the transport of the contaminant, yet it has not been well represented in global and regional mercury transport models. Most models rely heavily on computational data to parameterize mercury redox chemistry, and large discrepancies have been reported between the model parameters and experimental results. In this thesis, several critically important mercury redox processes in the atmosphere and marine cryosphere are investigated experimentally in laboratory, mesocosm and field studies. In the atmosphere, in-cloud mercury photoreduction is found to occur at rates that are much slower than those currently used in models, questioning the presumed dominance of the aqueous-phase reduction in the atmosphere. Mercury redox reactions are also studied in an outdoor sea ice mesocosm. At the atmosphere-sea ice interface, saline surfaces of experimental sea ice are shown to support heterogenous photochemical reactions causing the depletion of gaseous elemental mercury in the atmospheric boundary layer; whereas at the sea ice-seawater interface, cryo-photochemical processes could cause the decrease in the concentrations of dissolved gaseous mercury during the formation of sea ice. Overall, the results from this thesis research provide new and important concepts and experimental datasets to the mercury redox mechanism during its geochemical cycle. The results will advance model parametrizations on mercury redox chemistry and improve future projections of mercury cycling in the atmosphere and the Arctic marine cryosphere, which are especially important under a rapidly changing environment. Furthermore, the results also validate the mesocosm approach on studying cryo-photochemical processes in the sea ice environment, which opens up a new platform to study the geochemistry of other contaminants in the marine cryosphere.
MSpace at the Univer... arrow_drop_down MSpace at the University of ManitobaOther ORP type . 2023Data sources: MSpace at the University of Manitobaadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eu0 citations 0 popularity Average influence Average impulse Average Powered by BIP!more_vert MSpace at the Univer... arrow_drop_down MSpace at the University of ManitobaOther ORP type . 2023Data sources: MSpace at the University of Manitobaadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.euapps Other research product2022 Canada EnglishAuthors: Iligan, Sandy;Iligan, Sandy;All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=od______1875::5e3f5d3cef623da88937f39c699bfda0&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu0 citations 0 popularity Average influence Average impulse Average Powered by BIP!more_vert All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=od______1875::5e3f5d3cef623da88937f39c699bfda0&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euapps Other research product2022 Canada EnglishAuthors: Khoshrou, Ali; Ince, Ayhan;Khoshrou, Ali; Ince, Ayhan;Crack-tip stress evaluation requires special treatments in the frame of classical elasticity theory for characterizing fatigue crack growth behavior. In previous studies, modified finite element methods have been used to remedy infinite stresses predicted by the classical elasticity theory at the tip of a crack. Peridynamics, as a recently developed non-local theory, has proved to be a powerful mathematical modeling approach to overcome the limitations of continuum mechanics e.g. analyzing discontinuous problems such as cracks without utilizing special treatments/functions or additional crack behavior criteria. In this study, a state-based peridynamics modeling approach is developed to model and simulate displacement and stress fields around a hole and crack shape geometry in a steel plate structure. The peridynamics model is first used to simulate displacement and stress fields for a central hole in a plate under the uniform tension. Furthermore, it is also shown that the peridynamics approach provides high accuracies in modeling displacement and stress fields for sharp elliptical-shaped crack geometry. Part of the Proceedings of the Canadian Society for Mechanical Engineering International Congress 2022.
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For further information contact us at helpdesk@openaire.euapps Other research product2021 Canada EnglishAuthors: Lu, Chang; Jin, Zhehui; Li, Huazhou; Xu, Lingfei;Lu, Chang; Jin, Zhehui; Li, Huazhou; Xu, Lingfei;Two-phase and three-phase equilibria are frequently encountered in a variety of industrial processes, such as carbon dioxide (CO2) injection for enhanced oil recovery in oil reservoirs, multiphase separation in surface separators, and multiphase flow in wellbores and pipelines. Simulation and engineering design of these processes using isothermal/isochoric (VT) multiphase equilibrium algorithms are sometimes more convenient than that using the conventional isothermal/isobaric (PT) algorithms. This work develops a robust algorithm for VT multiphase equilibrium calculations using a nested approach. The proposed algorithm is simple because a robust PT multiphase equilibrium algorithm is used in the inner loop without any further modifications, while an effective equation-solving method (i.e., Brent’s method; Brent 1971) is applied in the outer loop to solve the pressure corresponding to a given volume/temperature specification. The robustness of the VT algorithm is safeguarded by using a highly efficient trust-region-method-based PT algorithm. We demonstrate the good performance of the newly developed algorithm by applying it to calculate the isochores of fluid mixtures that exhibit both two-phase and three-phaseequilibria.
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For further information contact us at helpdesk@openaire.euapps Other research productkeyboard_double_arrow_right Other ORP type 2020 Canada EnglishPublisher:Elsevier BV Authors: Hudson, Rebecca; Faraj, Fouad; Fotopoulos, Georgia;Hudson, Rebecca; Faraj, Fouad; Fotopoulos, Georgia;handle: 1974/28009
The morphological study of geological hand samples has a wide variety of applications in the geosciences, which is conventionally accomplished by measuring the distance between features of interest on the sample’s surface. Close-range three-dimensional (3D) laser scanners provide an opportunity to study the form and shape of geological samples in a digital environment and have been increasingly utilized in fields such as paleontology, rock mechanics, and sedimentology, with some uptake in planetary sciences and structural geology. For paleontological studies, primary applications are in quantitative analysis of fossil morphology and integration into 3D animated models for understanding species movements. In the field of rock mechanics, typical uses of 3D digital geological hand sample models include quantifying joint roughness coefficient (JRC), determining the surface roughness of rock samples, and assessing morphological changes over time due to processes such as weathering. In the field of sedimentology, such models are incorporated to characterize the shape of sediment particles and to calculate key parameters such as bulk density. This paper aims to provide a comprehensive review of established literature that includes substantial use of digital geological hand samples acquired from 3D close-range (<1m target distance) triangulation laser scanners in an effort to identify opportunities for future progress (such as global data sharing) as well as challenges specific to the nature of geological samples (e.g., translucency) and geoscientific workflows (on and off-site).
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For further information contact us at helpdesk@openaire.euapps Other research product2019 Canada EnglishGillard, Laura C.; Hu, Xianmin; Myers, Paul G.; Ribergaard, Mads Hvid; Lee, Craig M.;The oceanic heat available in Greenland’s troughs is dependent on the geographic location of the trough, the water origin, and how the water is impacted by local processes along the pathway to the trough. This study investigates the spatial pattern and quantity of the warm water (with a temperature greater −1.5◦C) brought to the shelf and into the troughs abutting the Greenland Ice Sheet (GrIS). An increase in ocean heat in these troughs may drive a retreat of the GrIS. Warm water that is exchanged from the trough into the fjord may influence the melt on the marine-terminating glaciers. Several regional ocean model experiments were used to study regional differences in heat transport through troughs. Results showed that warm water extends north into Baffin Bay, reaching as far north as the Melville Bay troughs. Melville Bay troughs experienced warming following 2009. From 2004 to 2006, model experiments captured an increase in onshore heat flux in the Disko Bay trough, coinciding with the timing of the disintegration of Jakobshavn Isbrae’s floating tongue and observed ocean heat increase in Disko Bay. The seasonality of the maximum onshore heat flux differs due to distance away from the Irminger Sea. Ocean temperatures near the northwestern coast and southeastern coast respond differently to changes in meltwater from Greenland and high-frequency atmospheric phenomena. With a doubling of the GrIS meltwater, Baffin Bay troughs transported ∼ 20 % more heat towards the coast. Fewer storms resulted in a doubling of onshore heat through Helheim Glacier’s trough. These results demonstrate the regional variability of onshore heat transport through troughs and its potential implications to the GrIS.
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For further information contact us at helpdesk@openaire.euapps Other research product2019 Canada EnglishHayashida, Haskase; Christian, James R.; Holdsworth, Amber M.; Hu, Xianmin; Monahan, Adam H.; Mortenson, Eric; Myers, Paul G.; Riche, Olivier G. J.; Sou, Tessa; Steiner, Nadja S.;Process-based numerical models are a useful tool for studying marine ecosystems and associated biogeochemical processes in ice-covered regions where observations are scarce. To this end, CSIB v1 (Canadian Sea-ice Biogeochemistry version 1), a new sea-ice biogeochemical model, has been developed and embedded into the Nucleus for European Modelling of the Ocean (NEMO) modelling system. This model consists of a three-compartment (ice algae, nitrate, and ammonium) sea-ice ecosystem and a two-compartment (dimethylsulfoniopropionate and dimethylsulfide) sea-ice sulfur cycle which are coupled to pelagic ecosystem and sulfur-cycle models at the sea-ice–ocean interface. In addition to biological and chemical sources and sinks, the model simulates the horizontal transport of biogeochemical state variables within sea ice through a one-way coupling to a dynamic-thermodynamic sea-ice model (LIM2; the Louvain-la-Neuve Sea Ice Model version 2). The model results for 1979 (after a decadal spin-up) are presented and compared to observations and previous model studies for a brief discussion on the model performance. Furthermore, this paper provides discussion on technical aspects of implementing the sea-ice biogeochemistry and assesses the model sensitivity to (1) the temporal resolution of the snowfall forcing data, (2) the representation of light penetration through snow, (3) the horizontal transport of sea-ice biogeochemical state variables, and (4) light attenuation by ice algae. The sea-ice biogeochemical model has been developed within the generic framework of NEMO to facilitate its use within different configurations and domains, and can be adapted for use with other NEMO-based sub-models such as LIM3 (the Louvain-la-Neuve Sea Ice Model version 3) and PISCES (Pelagic Interactions Scheme for Carbon and Ecosystem Studies).
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For further information contact us at helpdesk@openaire.euapps Other research productkeyboard_double_arrow_right Other ORP type 2018 Canada EnglishAuthors: Bamburak, Kimberley;Bamburak, Kimberley;handle: 1993/33418
This practicum examines the feasibility of cold-climate viticulture in southern Manitoba in light of ongoing climate change and establishes principles for sustainable viticulture appropriate to Manitoba’s geological conditions. As the climate continues to change, drastic changes will begin to occur within the wine industry. Regions that are currently suitable for production are likely to be subject to higher temperatures, more erratic precipitation and harsher weather. An opportunity exists within the Mowbray Plateau located in the Pembina River Valley, to establish a new type of agriculture in the Prairies—one that can grow and adapt as the climate changes. Prairie viticulture is feasible if done appropriately, utilizing sustainable landscape strategies such as planned cover crops, creating smaller microclimates, and planting according to terroir. These strategies can evolve alongside climate and microclimatic-specific research. This practicum demonstrates through case studies of existing cold-climate grape growers, and by research and design, that the Prairies could provide a healthy future for sustainable viticulture.
MSpace at the Univer... arrow_drop_down MSpace at the University of ManitobaOther ORP type . 2018Data sources: MSpace at the University of Manitobaadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eu0 citations 0 popularity Average influence Average impulse Average Powered by BIP!more_vert MSpace at the Univer... arrow_drop_down MSpace at the University of ManitobaOther ORP type . 2018Data sources: MSpace at the University of Manitobaadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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