2,125 research outputs found

    Grain Growth after Intercritical Rolling

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    The Impact Of Need For Social Affiliation And Consumer Relationship Proneness On Behavioural Intentions - An Empirical Study In A Hairdresser’s Context

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    This study investigates whether a consumer’s need for social affiliation and a consumer’s relationship proneness impact behavioural intentions (word-of-mouth communication, price sensitivity, repeat purchasing) towards a hairdresser’s. Data were collected from a systematic sample of a hairdresser’s consumers in Belgium. LISREL results revealed that need for social affiliation is a strong determinant of word-of-mouth communication and price sensitivity, while consumer relationship proneness has an indirect effect on price sensitivity via commitment. Important implications of the salient role of both constructs in determining behavioural intentions in a hairdresser’s context are provided.marketing ;

    Utilisation du sol, accessibilité et profil des ménages : effets sur le choix résidentiel et la valeur des propriétés = Land use, accessibility and household profiles : their effects on residential choice and house values

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    Cette thèse explore et développe différentes méthodes d’analyse afin de mieux comprendre les choix des ménages en terme de localisation résidentielle et les impacts de certaines externalités sur la valeur des propriétés unifamiliales. Le territoire d’étude couvre la ville de Québec, tandis que l’essentiel des analyses repose sur l’analyse de transactions effectuées pendant les périodes 1986-1987 et 1993-2001. De plus, une enquête téléphonique réalisée entre 2000 et 2002 a permis d’obtenir des informations complémentaires sur les critères de choix et le profil socio-démographique de quelque 800 ménages acheteurs de propriétés unifamiliales à Québec. Dans un premier chapitre, l’impact de l’utilisation du sol et plus particulièrement de la végétation est analysée, en ayant recours à la modélisation hédonique. Les données d’utilisation du sol, extraites de photos aériennes et d’une image satellite, sont compilées au sein d’un système d’information géographique, et ce, à différentes échelles. L’impact de la végétation, variable selon la proximité au centre ville, est clairement démontré. Dans un deuxième chapitre, les motivations liées au déménagement et les critères de choix de la résidence et du quartier par les ménages acheteurs sont étudiés. Une analyse des correspondances souligne le lien entre les critères de choix exprimés et les théories cognitive et géographique de « place-identity » et d’espaces de perception. Aussi, des régressions logistiques mesurent la probabilité d’exprimer un critère en fonction du profil du ménage et de la localisation. Le fait d’avoir ou non été préalablement propriétaire, l’âge, le type de ménage, le revenu, le niveau d’éducation ainsi que la localisation sont des facteurs significativement liés à divers critères de choix. Enfin, dans un troisième et dernier chapitre, les données décrivant le ménage sont introduites dans deux types de modèles hédoniques, les uns ayant recours à l’expansion spatiale et les autres utilisant les « Geographically Weighted Regressions ». L’hétérogénéité des valeurs implicites est alors analysée en considérant le profil des ménages. Il apparaît non seulement que la valeur marginale de plusieurs attributs varie en fonction du ménage acheteur, mais que le revenu et le statut de l’acheteur (ancien vs. nouveau propriétaire) ont un impact direct sur le prix d’achat de la propriété. Cette thèse, s’appuyant sur des méthodes d’analyse des marchés résidentiels et ayant recours à divers outils d’analyse spatiale, parvient à établir des liens entre le statut socio-démographique des ménages, leurs critères de choix résidentiels, et la structure spatiale de la ville de Québec.This thesis explores and develops various analytical methods in order to better understand residential choice and the implicit prices of single-family property markets. The area of study is Quebec City, whereas most of the work relies on single-family property transactions that occurred during the 1986-1987 and 1993-2001 periods. A phone survey held between 2000 and 2002 gave additional information on the choice criteria and household profiles of 800 of these actual property buyers. In a first chapter, the impact of the surrounding land use and vegetation is measured using hedonic modelling. Land-use data are extracted from both a mosaic of aerial photographs, and from a Landsat TM-5 image. Various measures of land use, at different spatial scales, are introduced within the hedonic models. More specifically, the heterogeneous impact of vegetation, depending on relative proximity to the Main Activity Centre, is shown. In a second chapter, motivations for moving and residential and neighbourhood choice criteria are analysed. A Correspondence Analysis underscores the links between choice criteria and the psychological and geographical theories of Place-Identity and perception spaces. Also, logistic regressions measure the odds of mentioning a criteria depending on the household profile and location. Previous tenure status, age, income, household structure and location are significantly related to various residential choice criteria. Finally, in a third chapter, the household-level data are introduced within the hedonic framework, using Casetti’s expansion method and Geographically Weighted Regressions. The heterogeneity of implicit prices is analysed regarding the buyer’s household profile. Not only does the marginal value of certain attributes vary regarding the buyer’s profile, but it appears that income and previous tenure status have a direct impact on property values. This thesis, through the development of new methods aiming at analysing residential markets and residential choices, contributes to further understanding the complex links between the socio-demographic dimension of households, their residential choice criteria, and the spatial structure of Quebec City

    Influence of cold-rolling reduction on retained austenite texture in cold-rolled and intercritically annealed TRIP-assisted steel

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    The newly developed multiphase transformation-induced plasticity (TRIP) steels are of interest for industrial applications because of their excellent combination of high strength and ductility. Their performance can be successfully controlled by designing an optimum balance in the volume fractions of ferrite, bainite and retained austenite. The characteristics of the retained austenite are considered to be the main key to achieving the desired final properties. Against this background, the effects of retained austenite characteristics, such as volume fraction, carbon concentration, size and shape, on the behaviour of TRIP steels have been studied. The crystallographic orientation of the retained austenite was measured by electron backscattered diffraction (EBSD). The effect of initial cold-rolling reduction on the microtexture development of the retained austenite was studied on an aluminium-containing TRIP steel. The results show that, by increasing the cold-rolling reduction before the final austempering, the main components of the face-centred cubic phase, i.e. copper, brass and Goss, dominate the texture of the retained austenite. In contrast, the copper and Goss components of the retained austenite are absent in the texture of lightly deformed sheets. The features of the preferred orientation of the retained austenite are discussed and explained in terms of the annealing texture of the recrystallized ferrite and bainite

    Landscaping and House Values: An Empirical Investigation

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    This article is the winner of the Real Estate Valuation manuscript prize (sponsored by The Appraisal Institute) presented at the 2001 American Real Estate Society Annual Meeting. This hedonic study investigates the effect of landscaping on house values, based on a detailed field survey of 760 single-family homes sold between 1993 and 2000 on the territory of the Quebec Urban Community. Environmental information includes thirty-one landscaping attributes of both houses and their immediate environment. By and large, a positive tree cover differential between the property and its immediate neighborhood, provided it is not excessive, translates into a higher house value. Findings also suggest that the positive price impact of a good tree cover in the visible surroundings is all the more enhanced in areas with a high proportion of retired persons. Finally, a high percentage of lawn cover as well as features such as flower arrangements, rock plants, the presence of a hedge, etc. all command a substantial market premium.

    OIM analysis of microstructure and texture of a TRIP assisted steel after static and dynamic deformation

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    TRIP-assisted steel with a composition of 0.2%C, 1.6%Mn, 1.5%Al was studied in the undeformed state, after the application of 10 and 30 % static tensile strain parallel to rolling the direction of the sheet and after dynamic (Hopkinson) fracture test. Detailed examination of the microstructure and microtexture by means of electron backscattered diffraction (EBSD) was carried out in order to quantify the microstructural constituents and to study the strain distribution. The microtexture evolution and the distribution of the specific texture components between the BCC and FCC phases were studied as a function of the external strain and the strain mode-static or dynamic. The strain localization and strain distribution between the structural constituents were quantified based on local misorientation maps. The full constraint Taylor model was used to predict the texture changes in the material and the results were compared to the experimental findings. Comparing the local misorientation data it was found that at low strains the ferrite accommodates approximately 10 times more deformation than the retained austenite. The strain localizes initially on the BCC-FCC phase boundaries and is then spread in the BCC constituents (ferrite and bainite) creating a deformation skeleton in the BCC phase. It was found that the observed texture changes in the measured retained austenite texture after deformation do not correspond exactly to the model prediction. The austenite texture components which were predicted by the Taylor model were not found in the measured austenite texture after deformation which means that they are first transformed to martensite, which is considered as an indication for the selective transformation of austenite under strain

    Mechanical and forming properties of AA6xxx sheet from room to warm temperatures

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    The influence of temperature on the mechanical behaviour of the heat treatable Aluminium alloy EN AW-6061 has been investigated with a series of tensile tests. It is found that temperature has an effect on both the storage of dislocations and dynamic recovery. The results have been used to fit the dislocation based Nes work-hardening model. Simulations show that the model captures properly the dependence of yield stress and work-hardening rate with temperature and temper. The work-hardening model has been implemented into the Dieka FEM to simulate the warm deep drawing of cylindrical cups. Comparison of the simulated and experimental punch force and cup thickness reveals a good correspondence and validates the proposed modelling approach
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