Parameter estimation from measurements along quantum trajectories

The dynamics of many open quantum systems are described by stochastic master equations. In the discrete-time case, we recall the structure of the derived quantum filter governing the evolution of the density operator conditioned to the measurement outcomes. We then describe the structure of the corresponding particle quantum filters for estimating constant parameter and we prove their stability. In the continuous-time (diffusive) case, we propose a new formulation of these particle quantum filters. The interest of this new formulation is first to prove stability, and also to provide an efficient algorithm preserving, for any discretization step-size, positivity of the quantum states and parameter classical probabilities. This algorithm is tested on experimental data to estimate the detection efficiency for a superconducting qubit whose fluorescence field is measured using a heterodyne detector.Comment: 8 pages, 3 figures, submitte

Interactions between a buffered amine oxide impregnation carrier and an acrylic resin, and their relationship with moisture

Wood used outdoor is subjected to different sources of degradation and should be protected properly. In this study, acrylic resins were added to a wood impregnation system using amine oxides and propiconazole, an organic fungicide, to create a two-part wood protection preservation treatment. Since amine oxides can diffuse readily into wood, this treatment protected both the surface and inner structure of the treated wood following a simple dipping. Many aspects of the treatment were studied: the adhesion of the acrylic coatings, their permeability to water, and the impregnation depth of the propiconazole. In each case, a particular attention was accorded to the interactions between the resins and the impregnation system. Adhesion and permeability tests were coupled with an artificial aging process simulating severely wet conditions. Amine oxides reduced the adhesion of the coatings but did not impair their aging properties. Because of their hydrophilic nature, they also increased the permeability to liquid water, although they did not affect the air moisture permeability. The penetration of the propiconazole, estimated with a dye, decreased with the resin. Overall, the two parts of the treatment lightly impaired each other, but the practical aspect of this treatment may overcome these disadvantages

Hardness of chemically densified Yellow birch in relation to wood density, polymer content and polymer properties

Density of wood can be increased by filling its porous structure with polymers. Such densification processes aim to increase hardness of wood and are particularly interesting for flooring applications. This study aims to evaluate efficiency of different polymers for chemical densification based on the polymer properties. Yellow birch (Betula alleghaniensis Britt.) was chemically densified with seven monomer mixtures through acrylate monomer impregnation and electron beam in-situ polymerization. Chemical retention and polymer content of densified woods were recorded. Hardness of treated and untreated Yellow birch was measured and compared to hardness of Jatoba (Hymenaea courbaril L.). All densified woods showed higher or comparable hardness to Jatoba. Hardness of densified wood was analyzed in relation to initial density of wood and polymer content of the material using multivariable linear mixed models. Efficiency of polymers for chemical densification was evaluated through effect of polymer content on hardness with interaction coefficients. Polymer films corresponding to monomer impregnating mixtures were prepared through low energy electron beam and characterized by their glass transition temperature, micro hardness, indentation modulus and crosslinking density. Polymers showed statistically significantly different efficiencies and were separated in two main groups. Overall, polymer efficiency increased with increasing glass transition temperature of polyacrylates

FACTORS AFFECTING THE PROFITABILITY OF GOLF COURSES IN GEORGIA

Land Economics/Use,

Effets de la configuration du paysage sur la variabilité génétique de populations de souris sylvestres (Peromyscus maniculatus: Rodentia, Muridae)

Thèse numérisée par la Direction des bibliothèques de l'Université de Montréal

Analyse des cas de neurolyse périphérique à l'alcool éthilique dans le traitement de la névralgie du trijumeau à l'Hôpital de l'Enfant-Jésus de 1995 à 2005

À travers l'étude evaluative et rétrospective des cas de névralgie du trijumeau recensés entre 1995 et 2005 dans les services de neurochirurgie et de chirurgie buccale et maxillo-faciale de l'Hôpital de l'Enfant-Jésus, nous avons caractérisé la cohorte des patients suivis et traités par neurolyse périphérique à l'alcool pour identifier l'utilité clinique de cette modalité thérapeutique dans le cadre global de l'approche de cette pathologie. Cette recherche vise d'abord à cerner l'indication, sinon la pertinence, de ce type d'intervention et en circonscrire le cadre d'utilisation, au vu des particularités de l'évolution naturelle ou altérée de la maladie. Après revue de la littérature et analyse de l'échantillon, nous proposons une conduite standardisée pour éventuellement guider une intervention concertée, en situant objectivement le type de procédure en fonction de sa rentabilité thérapeutique avérée

Les corps extraterrestres (roman) : suivi de Le jeu réaliste magique de la fiction : le réalisme magique narratif comme posture de lecture paradoxale (étude) et de Une thèse "100 modèles" : méthode et recherche-création (petit essai)

Cette thèse de recherche-création en études littéraires se divise en trois parties. La première, Les corps extraterrestres, est un roman qui s’intéresse à deux personnages principaux, Xavier et Hollywood. Le roman, de facture existentialiste, oscille entre le réel et l’étrange, un peu à la manière du réalisme magique. Les deux personnages, lorsqu’ils s’endorment chacun de leur côté, se retrouvent ensemble dans des chambres d’hôtel puis à Montauk, dans une maison sur la plage, sans trop savoir pourquoi et comment ils y ont été transportés. Ils tentent de déterminer de quelle manière exister dans le monde, à travers une description minutieuse de leurs perceptions et émotions, qui s’effectue au moyen de la poésie pour Hollywood et du cahier de notes pour Xavier. La deuxième partie de la thèse est une étude théorique intitulée Le jeu réaliste magique de la fiction. Le réalisme magique comme posture de lecture paradoxale. Cette réflexion alliant théories des genres, théories de la réception, narratologie et histoire littéraire s’intéresse à ce qui se passe lorsqu’un lecteur entre dans un récit réaliste magique. En interrogeant les modalités narratives du réalisme magique et l’interaction entre le texte et le lecteur, nous en arriverons, au terme de cette étude, à postuler que le réalisme magique puisse être, en plus d’un mode narratif, une posture de lecture, un processus cognitif paradoxal pouvant faire sens de certaines œuvres romanesques contemporaines. La thèse se termine sur un petit essai en guise de conclusion, intitulé Une thèse « 100 modèles » : méthode et recherche création. La réflexion sur les manières d’effectuer une thèse de recherche-création est fondamentale dans le cadre d’un parcours comme le nôtre et cette troisième partie en laisse des traces pour justifier la démarche adoptée, pour l’expliciter, la montrer, la décrire, la définir, etc. Cette troisième partie s’interroge sur le sens des études supérieures en création littéraire et propose de réfléchir explicitement aux modalités de la recherche-création et au choix qui aura mené à l’écriture d’une thèse tripartite alliant écriture créative et recherche théorique

Discrete fracture network based drift stability at the Éléonore mine

Photogrammetry tools were used to characterise the rock mass structural regime at selected mining drifts at the Éléonore underground mine in Canada. This information was used to provide the input data for generating a series of discrete fracture networks (DFN) models. The generated DFN models were subsequently used to investigate the creation of rock wedges along the drifts that may impact the stability of the excavations. The impact of the choice of employed DFN model on the analysis was investigated with reference to the stability of excavations. A series of parametric analyses demonstrated the sensitivity of the model to variations in the properties of the structural regime. The benefits of using stochastic modelling to capture the inherent variability are reviewed

Rabies Postexposure Prophylaxis in Routine Practice in View of the New Centers for Disease Control and Prevention and World Health Organization Recommendations

Under real-life conditions rabies post-exposure prophylaxis is often administered in a suboptimal manner. In this study, 6.7% of previously non-immune patients did not develop adequate antibody levels after 4 doses of rabies vaccin

Impact of a reinforcement treatment with acrylate impregnation on the mechanical behavior of black spruce as connector member.

As a previous study has shown, it is possible to increase by 50% the dowel bearing strength of black spruce with an acrylate formulation applied by impregnation. Three diameters of bolts and two orientations of loading were included in this study. The effect of treatment on the dowel-bearing strength appeared to increase while the diameter of bolt decreased. The orientation of loading was significant as the treatment had a major impact in the parallel to grain direction and no impact in the perpendicular direction. With the digital image correlation analysis, an expanded strain field perpendicular to the load direction was observed. The superior embedding capacity would help to reduce the dimensions of the timbers as well as the number of connections required in the building design. With an increase of ductility, wood connections show a safer yielding behavior