Les travaux présentés portent sur les étapes successives qui ont conduit au développement dans les années 1980 d'un modèle numérique qui simule l'évolution temporelle d'un manteau neigeux saisonnier en fonction des conditions météorologiques. Une première partie décrit le développement d'un modèle de neige multi-couches qui calcule les échanges d'énergie entre la neige et l'atmosphère et simule les principaux processus physiques qui contrôlent les échanges au sein du manteau neigeux.Une deuxième partie décrit comment ont été quantifiées les lois de métamorphose de la neige humide et de la neige sèche soumise à un faible gradient de température, de façon à compléter les connaissances existantes et proposer un jeu relativement complet de lois de métamorphoses de la neige saisonnière. Une troisième partie décrit l'implémentation de ces lois dans le modèle numérique, permettant ainsi de simuler la stratification du manteau neigeux, fonctionnalité qui n'existait dans aucun autre modèle à cette époque. Une évaluation détaillée de ce modèle sur le site du Col de Porte est présentée. La dernière partie introduit trois applications originales qui ont ensuite exploité les fonctionnalités de ce modèle : la simulation en temps réel de l'état caractéristique du manteau neigeux dans les Alpes françaises, l'étude de l'impact du changement climatique sur l'enneigement et la simulation de l'état du manteau neigeux dans un modèle hydrologique distribué / The thesis describes the different steps which lead during the 1980's to the development of an original numerical snow model. This model aimed at simulating the evolution of a seasonal snow cover as a function of the prevailing meteorological conditions. A first part describes the methods and algorithms used to compute the energy and mass exchange at the snow/atmosphere interface and inside the snowpack. The second part describes the experimental study which made possible the quantification of the metamorphism rate of snow samples submitted to weak temperature gradient and to liquid water content, in order to complete pre-existing knowledge on metamorphism. A third part describes the implementation of a set of metamorphism laws into the preliminary version of the snow model, which lead to the availability of the first numerical model able to simulate seasonal snowpack layering. The evaluation of the model at Col de Porte is presented. The last part introduces three applications of this model: real time monitoring of snowpack characteristics in the French Alps, assessment of the impact of climate change on snow climatology and simulation of the snowpack in a distributed hydrological model

This thesis is about social class and economic inequality, using the Goldthorpe class schema. It tests theories claiming that social class is increasingly irrelevant to inequality and people's life-chances with data on incomes and material living standards from the British Household Panel Survey. It covers the period over which the survey ran, i.e. 1991-2008. During this time many prominent social theories dismissed class analyses while others sought to retain the class concept but dismissed its economic foundations, seeking to ground it in culture instead. Economic inequality has not figured highly on the agenda of class analysts, at least not those working with the Goldthorpe class schema. There is a substantial body of work on mobility, voting behaviour, income poverty and material deprivation, but inequality in a broader sense has for the most part been neglected. This thesis is a step towards rectifying this situation. Thus it provides new information about within-career social mobility as well as income inequality within and between classes, on whether income mobility reduces class inequalities over time, and cast light on class inequalities in material living standards. The findings suggest that class is far from irrelevant to economic inequality. Class differences in incomes are persistent, between class inequalities contribute more to inequality overall than within-class inequalities, and while income mobility does reduce class inequalities over time it is not to the extent that supports the hypothesis that class is irrelevant to people's economic fortunes.

Data on the managerial and professional specialty occupations that were specified by the United States Census of the Population for the years 1950 through 1980 were used to analyze the influence of occupational sex ratios, growth rates, and male and female salary levels on the ability of females to move into those occupations. An analysis of the change in the Standardized Occupational Sex Ratio (SSR) showed that, over the thirty year period studied, growth rates became more important than salary levels in influencing movement toward parity in high status occupations. Before the 1980 census year, occupational growth rates were found to interact with both male and female salary levels. During all four census years, slowly growing occupations experienced the smallest movement toward parity regardless of salary level. The lack of movement toward parity in slowly growing occupations shows evidence of gender division. In rapidly growing fields, lower salary levels for both males and females led to greater movement toward parity for females. Movement toward parity in rapidly growing fields that offered lower salaries was taken as evidence of less sheltering. In declining fields, occupations with above median female salaries allowed greater female entry than did those with below median female salaries. The opportunity for women to move into declining fields showed evidence of chain mobility. By 1980, females were moving into managerial and professional specialty occupations at every salary level and growth rate; however, the greatest movement toward parity occurred in those occupations that were rapidly growing. Movement toward parity in rapidly growing occupations provided evidence of structural mobility. By 1980, rapidly growing occupations were experiencing fair sharing of occupational opportunity. The slowly growing occupations, though experiencing some female growth, still showed evidence of male sheltering.

This study presents the major ideas of Mahatma Gandhi on social stratification and social inequality. The methodology consists of systematically reading and analyzing the literature through which the theoretical components of social stratification in Gandhi's writings become more explicit, and evaluating these theoretical components. A systematic statement of Gandhi's theory of social stratification included the following five components. First, social differentiation is inherent in human nature. Gandhi believed in the universality of social differentiations and was convinced that societies were organized into the divisions on the basis of vocations. Second, relations among strata imply that a division of labor is essential for the stability and organization of society. Gandhi also implied that this division of labor is necessary and functional. Third, normative patterns establish traditions of heredity. To Gandhi, the four divisions in society defined a person's "calling" which is essential for social organization. Fourth, the system of stratification is the universal law that everyone is obliged to follow. Gandhi tried to legitimize social stratification through moral and religious values of the society. Fifth, social stratification system defines duties only and does not confer any privileges. To Gandhi, the divisions of people into strata was the best possible adjustment of social stability and progress. While accepting some form of social stratification for the benefit of total funcioning of the society, Gandhi refused to accept that social inequality necessarily grows out of the process of social stratification. To maintain the hereditary law of social stratification and reduce the inequality, Gandhi suggested the abolition of the present caste system and the revival of four orders of social organization, the removal of the concept of untouchability, the regulation of trusteeship, decentralization of power, the increase of women's status, and vocational education for all.

Quantification of stream macrobenthos populations has remained a perplexing problem in rivbrine ecology, despite numerous attempts at improvement. This is in part due to well documented variations in chemical and physical parameters locally and geographically, and resultant adapted macrobenthos populations. Southwood (1968) and Hynes (1970a) have reviewed the various sampling techniques developed'for the census of lotic macrobenthos populations. Needham and Usinger (1956), Chutter (1969), and others have pointed out the difficulty in obtaining adequate numbers of samples which will yield population estimates with desired statistical confidence, and still maintain some degree of sampling economy. Needham and Usinger (1956) and Gaufin et al. (1956) mentioned the "patchy" distribution of aquatic insect populations as the primary source of this difficulty. The concept of patchy distribution in insect populations was originally discussed by Andrewartha (1961). Attempts to improve confidence through improved sampling devices and techniques have led to development of numerous types of samplers. Cummins (1962) indicated that there were almost as many samplers as there were researchers.

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

Although there is an increasing interest in social sciences amongst policy makers in financial services and investment organisations, not enough is known about the way financial organisations and activities interact with their social environments. In particular, there is a need for more research into the way financial activities are integrated into broader social structures. This thesis will report on a comparative study analysing the practices of financial organisations and their employees in two very different social environments: the UK and Chile. From 38 in-depth interviews with financial practitioners in London, Edinburgh and Santiago de Chile about their job trajectories and experiences, it was possible to analyse the practices of financial organisations in the UK and Chile, with an emphasis on the way they interact with global financial trends and local distributions of power and resources. A sociological account of organisational processes such as recruitment, socialisation, staff allocation, promotion and organisation of work within firms in these countries allowed for description and analysis of the way firms’ practices are related to their social (structural, symbolic and institutional) contexts. The research shows that Chile’s position in the global financial market and local distribution of resources encourage more traditional organisational practices, especially in terms of recruitment, socialisation, staff allocation and promotion, as well as activities performed and the way services are provided. In the UK, on the other hand, all of the above-mentioned processes are more technical, formally designed and competitive.

Fifteen women who identify themselves as lesbians were located through snowball sampling. These women participated in confidential taped interviews and assigned pseudonyms. They were questioned on topics which included growing up gay, family, work relations and friendship associations. It was assumed that life experiences may differ on the basis of social environments. This study focused on the unique experiences of rural lesbians. Erving Goofman’s book, Stigma, provided the theoretical framework utilized in the analysis of lesbian identity management. It also allowed for a discussion of stigma and its effect on lesbians. The women in the study experiencing homosexual feelings during prior to adolescence. Their reactions to these feelings related directly to the amount of stigma that they had internalized. All women in the study developed maintenance strategies that prevented disclosure of their lesbianism. It was found that lesbians often suffer great consequences when their sexuality is disclosed.

This qualitative case study explores the post-Katrina experiences of African Americans in Houston and in New Orleans. When the levees failed, residents from New Orleans were scattered across the country. Houston housed the largest population of displaced low-income African Americans from New Orleans. As the rebuilding process began, housing, employment, education, and healthcare policies in New Orleans changed. These institutional changes employed urban revitalization and poverty removal strategies adapted to disaster recovery. This study differs from previous research by examining these changes with an intersectional approach. It explores how African Americans frame obstacles as they attempt to return to a city with reformed housing, employment, education, and healthcare policies. To do this, I analyze three different cases 1) those that returned to New Orleans, 2) those still displaced in Houston, and 3) those that relocated to Houston after returning to New Orleans for over a year.

This thesis supplements existing literature by examining the relationship between institutional regulations and gendered assumptions about bodies. This thesis draws from feminist social constructionist perspectives and gendered organizational theories to explore the role of gendered body assumptions in the organizational framework of a hypermasculine political institution. Using the U.S. military as an illustrative example, this thesis studies military policies and rationales historically, focusing on the post-Vietnam accelerated inclusion of women, the increasing use of combat as a divisive component, and the gendered structural elements that are used to determine physical competence. Findings coincide with existing literature and suggest that social meanings relating to gender are a prominent influence in U.S. military policy historically and contemporarily, even when biological reasons are cited as justification. This research provides implications for understanding institutional, strategic use of gender and provides analysis of how physical bodies and accompanying social meanings are impacted by institutional goals.