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4. Observations of Coastal Landslide-Generated Tsunami Under an Ice Cover: The Case of Lac-des-Seize-Îles, Québec, Canada

Author

Leblanc, Jonathan, Turmel, Dominique, Therrien, Julie, Locat, Jacques, Lamarche, Geoffroy, editor, Mountjoy, Joshu, editor, Bull, Suzanne, editor, Hubble, Tom, editor, Krastel, Sebastian, editor, Lane, Emily, editor, Micallef, Aaron, editor, Moscardelli, Lorena, editor, Mueller, Christof, editor, Pecher, Ingo, editor, and Woelz, Susanne, editor

Published
2016
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5. Tsunami generation by potential, partially submerged rockslides in an abandoned open-pit mine: the case of Black Lake, Quebec, Canada

Author

Leblanc, Jonathan, Turmel, Dominique, Locat, Jacques, Harbitz, Carl B., Lovholt, Finn, Kim, Jihwan, Grenon, Martin, and Locat, Ariane

Subjects
Tsunamis -- Environmental aspects -- Canada, Rockslides -- Environmental aspects, Water, Chrysotile, Infrastructure (Economics), Earth sciences, Environmental aspects
Abstract

The Black Lake rockslide is located on the east wall of an open-pit mine initially operated by LAB Chrysotile near Thetford Mines, Quebec. Movements were observed in July 2012 when a volume of 2.0 x [10.sup.7] [m.sup.3] was mobilized, destroying a large portion of Highway 112. Mining operations ceased in 2012, causing the complete shutdown of the pumping system whose goal was to prevent the rise of water level in the pit. As the water level increases in the pit, it is essential to determine the potential of tsunami generation by possible partially submerged rockslides and to understand the potential impacts. A series of possible scenarios have been analysed with regard to velocity and acceleration of the potential rockslide as well as the corresponding wave generation and inundation. Results from the simulation show that when the factor of safety of the global slope is less than unity, inundation would not reach the potentially vulnerable infrastructures. Maximum wave height will vary as a function of the filling of the lake, and the lower wave height relative to water depth will happen when the lake is completely filled.Key words: landslide-generated tsunami, partially submerged landslide, numerical modeling, open-pit mine, active rockslide.Le glissement de Black Lake est situe sur la paroi est d'une ancienne mine a ciel ouvert exploitee par la compagnie LAB Chrysotile, a Thetford Mines, Quebec. Ce glissement actif a connu un fort episode de glissements en juillet 2012, ou un volume de 2,0 x [10.sup.7] [m.sup.3] a ete mobilise, emportant une large portion de la Route 112. Les operations minieres ont cesse en 2012, causant l'arret complet du systeme de pompage lequel visait a prevenir la montee du niveau d'eau dans la fosse. Comme le niveau d'eau augmente dans la fosse il devient primordial de determiner le potentiel tsunamigenique genere par des glissements rocheux partiellement submerges possibles afin de comprendre le phenomene et de reagir efficacement a celui-ci. Plusieurs modelisations numeriques ont ete realisees a partir de scenarios probables concernant les vitesses et les accelerations de glissement rocheux potentiel ainsi que la formation de vagues et l'inondation correspondantes. Les modelisations effectuees ont permis de montrer que, lorsque le facteur de securite de la pente globale est inferieur a 1, aucune infrastructure potentiellement vulnerable ne serait touchee par un eventuel tsunami. La hauteur maximale de la vague generee sera fonction de la hauteur d'eau dans le bassin. Les hauteurs de vagues minimales, relatives au niveau d'eau dans le bassin, seront generees lorsque le bassin sera completement rempli.Mots-cles: tsunami genere par un glissement de terrain, glissement partiellement submerge, modelisation numerique, mine a ciel ouvert, glissement rocheux actif., 1. IntroductionApproximately 90 km south of Quebec City, on the border between Black Lake sector to the north (part of Thetford Mines) and the municipality of Saint-Joseph-de-Coleraine to the south, [...]

Published
2018
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9. Bill 78 and the Quebec student strike

Author

Leblanc, Jonathan

Subjects
Students' societies -- Political activity, Student movements -- Political aspects, Tuition -- Laws, regulations and rules -- Political aspects, Political science, Government regulation, Political activity, Political aspects, Laws, regulations and rules
Abstract

EVERYTHING BEGAN with a rhetorical shift in Liberal government parlance: the student strike, a common enough phenomenon in Quebec's social history, began to be referred to not as a "strike" [...]

Published
2012

10. Identity and Data Security for Web Development : Best Practices

Author

LeBlanc, Jonathan, Messerschmidt, Tim, LeBlanc, Jonathan, and Messerschmidt, Tim

Subjects
Web site development, Electronic information resources--Access control, Business enterprises--Computer networks--Security measures, Computer networks--Security measures
Abstract

Developers, designers, engineers, and creators can no longer afford to pass responsibility for identity and data security onto others. Web developers who don't understand how to obscure data in transmission, for instance, can open security flaws on a site without realizing it. With this practical guide, you'll learn how and why everyone working on a system needs to ensure that users and data are protected.Authors Jonathan LeBlanc and Tim Messerschmidt provide a deep dive into the concepts, technology, and programming methodologies necessary to build a secure interface for data and identity—without compromising usability. You'll learn how to plug holes in existing systems, protect against viable attack vectors, and work in environments that sometimes are naturally insecure.Understand the state of web and application security todayDesign security password encryption, and combat password attack vectorsCreate digital fingerprints to identify users through browser, device, and paired device detectionBuild secure data transmission systems through OAuth and OpenID ConnectUse alternate methods of identification for a second factor of authenticationHarden your web applications against attackCreate a secure data transmission system using SSL/TLS, and synchronous and asynchronous cryptography

Published
2016

11. Tsunami modelling of the 7250 cal years BP Betsiamites submarine landslide

Author

Turmel, Dominique, Locat, Jacques, Leblanc, Jonathan, and Cauchon-Voyer, Geneviève

Abstract

On the north shore of the St Lawrence Estuary (Québec, Canada), near the Betsiamites river delta, a large sub-aerial submarine landslide complex was mapped using multi-beam bathymetry and light detection and ranging (LiDAR) data. Previous analysis of this landslide complex revealed that, since 7250 cal years BP, at least four different landsliding events occurred to form the present morphology, in which over 2 km3of material have been mobilized. The 7.25 cal ka BP landslide is of particular interest here: this landslide is entirely submarine and mobilized about 1.3 km3of material, deposited over an area of 54 km2, which make this landslide the largest identified on the St Lawrence estuary seafloor. This landslide showed a runout distance of about 15 km. Landslide-generated tsunamis may be triggered by such a landslide, where a large volume of material is mobilized in a short time. Kinematic analysis of this landslide was previously performed, and here we use these analyses in order to perform tsunami wave generation and propagation modelling. It is shown in this analysis that, even if the mobilized volume is very high and there is a long runout, the tsunami generated is small with tsunami wave amplitudes of <1.5 m, except in the vicinity of the landslide. The highest tide elevation in this part of the St Lawrence Estuary is about 5.5 m, so the impact of such a tsunami wave may be limited.

Published
2019
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12. Study and design of a process for the elaboration of polyamide blends coupling a polycondensation pilot plant with static mixers

Author

Leblanc, Jonathan, Laboratoire des Sciences du Génie Chimique (LSGC), Institut National Polytechnique de Lorraine (INPL)-Centre National de la Recherche Scientifique (CNRS), Institut National Polytechnique de Lorraine, Fernand Pla, and Christian Fonteix

Subjects
Morphology, Malaxeurs et mélangeurs, [SPI.OTHER]Engineering Sciences [physics]/Other, Polymer blends, Modélisation, Alliages de polymères, Static mixers, Modeling, Polyamides, Mélanges de polymères, Morphologie, [SDV.AEN]Life Sciences [q-bio]/Food and Nutrition, Mélangeurs statiques
Abstract

The aim of this work is to develop a process, which enables to blend polyamide in molten state with others polymers, directly at the outlet of a polycondensation reactor. Contrary to currently industrial processes, no remelting stage is needed in this one. The study has been carried out with polyamide 66 / polyethylene glycol blends (products with very different viscosities) and with polyamide 66 / ethylene propylene blends (products with similar viscosities), with or without polypropylene-graft-maleic-anhydride as interfacial agent. The first part of this work deals with the characterization of the dispersions obtained for these blends when their elaborations are carried out using conventional processes. Only few studies are available on blends, which exhibit a large difference between components viscosity. This work led us to develop a model to correlate, in this case, the dispersed phase size to the main operating conditions of each processes.The second part is dedicated to the design and the realization of an experimental installation, which is composed of polycondensation plant equipped, at the outlet of reactors, with a blending device based on static mixers technology. Its operation has been tested and experiments have been carried out in order to study the influence of the different processing parameters on blends morphology. The comparison of the results with those previously obtained using conventional processes allowed then to precise the performances and the limits of the process developed in this study; Ces travaux de recherche portent sur le développement d’un procédé permettant de mélanger, directement en sortie de polycondensation, du polyamide fondu avec d’autres polymères immiscibles en tant qu’additifs. Ce procédé se distingue ainsi des méthodes d’élaboration conventionnelles pour lesquelles une fusion préalable des polymères est nécessaire. L’étude concerne le mélange de polymères de viscosités très différentes (polyamide 66 et polyéthylène glycol) et le mélange de polymères de viscosités similaires (polyamide 66 et copolymère d’éthylène propylène, en présence ou non d’un agent d’interface : polypropylène greffé par de l’anhydride maléique).Une première partie de ce travail a consisté à caractériser la dispersion de ces mélanges élaborés selon des procédés conventionnels. Ce travail a conduit à développer un modèle reliant la taille de la phase dispersée aux principaux paramètres opératoires de chaque procédé, pour le cas rarement recensé dans la littérature, des mélanges de polymères de viscosités très différentes.La seconde partie a été consacrée à la conception et à la réalisation d’une installation constituée d’un pilote de polycondensation équipé, en sortie de réacteurs, d’un dispositif de mélange reposant sur la technologie des mélangeurs statiques. Son fonctionnement a ensuite été éprouvé pour les deux mélanges considérés, grâce des expériences qui ont permis d’analyser l’influence de différentes conditions opératoires sur la morphologie des mélanges générés. La comparaison des résultats obtenus à ceux issus des procédés conventionnels, a alors permis de préciser les performances et les limites du procédé développé dans cette étude

Published
2008

13. Étude et mise au point d'un procédé d'élaboration de mélanges à base de polyamides combinant un pilote de polycondensation et des mélangeurs statiques

Author

Leblanc, Jonathan, UL, Thèses, Laboratoire des Sciences du Génie Chimique (LSGC), Institut National Polytechnique de Lorraine (INPL)-Centre National de la Recherche Scientifique (CNRS), Institut National Polytechnique de Lorraine, Fernand Pla, and Christian Fonteix

Subjects
[SPI.OTHER]Engineering Sciences [physics]/Other, Morphology, Malaxeurs et mélangeurs, [SPI.OTHER] Engineering Sciences [physics]/Other, Static mixers, Modeling, Polyamides, [SDV.AEN] Life Sciences [q-bio]/Food and Nutrition, Polymer blends, Modélisation, Alliages de polymères, Mélanges de polymères, [SDV.AEN]Life Sciences [q-bio]/Food and Nutrition, Morphologie, Mélangeurs statiques
Abstract

The aim of this work is to develop a process, which enables to blend polyamide in molten state with others polymers, directly at the outlet of a polycondensation reactor. Contrary to currently industrial processes, no remelting stage is needed in this one. The study has been carried out with polyamide 66 / polyethylene glycol blends (products with very different viscosities) and with polyamide 66 / ethylene propylene blends (products with similar viscosities), with or without polypropylene-graft-maleic-anhydride as interfacial agent. The first part of this work deals with the characterization of the dispersions obtained for these blends when their elaborations are carried out using conventional processes. Only few studies are available on blends, which exhibit a large difference between components viscosity. This work led us to develop a model to correlate, in this case, the dispersed phase size to the main operating conditions of each processes.The second part is dedicated to the design and the realization of an experimental installation, which is composed of polycondensation plant equipped, at the outlet of reactors, with a blending device based on static mixers technology. Its operation has been tested and experiments have been carried out in order to study the influence of the different processing parameters on blends morphology. The comparison of the results with those previously obtained using conventional processes allowed then to precise the performances and the limits of the process developed in this study, Ces travaux de recherche portent sur le développement d’un procédé permettant de mélanger, directement en sortie de polycondensation, du polyamide fondu avec d’autres polymères immiscibles en tant qu’additifs. Ce procédé se distingue ainsi des méthodes d’élaboration conventionnelles pour lesquelles une fusion préalable des polymères est nécessaire. L’étude concerne le mélange de polymères de viscosités très différentes (polyamide 66 et polyéthylène glycol) et le mélange de polymères de viscosités similaires (polyamide 66 et copolymère d’éthylène propylène, en présence ou non d’un agent d’interface : polypropylène greffé par de l’anhydride maléique).Une première partie de ce travail a consisté à caractériser la dispersion de ces mélanges élaborés selon des procédés conventionnels. Ce travail a conduit à développer un modèle reliant la taille de la phase dispersée aux principaux paramètres opératoires de chaque procédé, pour le cas rarement recensé dans la littérature, des mélanges de polymères de viscosités très différentes.La seconde partie a été consacrée à la conception et à la réalisation d’une installation constituée d’un pilote de polycondensation équipé, en sortie de réacteurs, d’un dispositif de mélange reposant sur la technologie des mélangeurs statiques. Son fonctionnement a ensuite été éprouvé pour les deux mélanges considérés, grâce des expériences qui ont permis d’analyser l’influence de différentes conditions opératoires sur la morphologie des mélanges générés. La comparaison des résultats obtenus à ceux issus des procédés conventionnels, a alors permis de préciser les performances et les limites du procédé développé dans cette étude

Published
2008

14. Was Martin Heidegger an Historicist?

Author

LeBlanc, Jonathan Lynn

Subjects
*HISTORICISM, *AUTHENTICITY (Philosophy), *PHILOSOPHY, *SCHOLARS
Abstract

The article elucidates the character of Martin Heidegger's historicism, through a reading of certain relevant sections of Heidegger's magnum opus. It states that authenticity leaves room for human thought to operate independently of the historical situation. It reflects that historicism, the idea that all human thought is a product of its time and place, dissolves philosophy according to Strauss and other scholars.

Published
2010

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