Nous étudions des approximations des équations de Navier-Stokes compatibles avec la recherche de solutions auto-similaires. Pour ce faire, nous utilisons un modèle préservant le changement d'échelle et vérifiant une égalité d'énergie. Lorsque la donnée initiale est dans L2, nous montrons qu'il converge vers une solution faible de Leray des équations de Navier-Stokes. La preuve utilise une nouvelle expression (locale) de la pression : via le formalisme des solutions "mild", le théorème de régularité maximale du noyau de la chaleur permet le contrôle de la pression approchée. Les chapitres suivants sont consacrés à la construction d'une solution des équations de Navier-Stokes, globale en temps et adaptée au sens de Caffarelli, Kohn et Nirenberg, lorsque la donnée initiale est dans M 2;3 : la pression est cette fois contrôlée grâce à l'utilisation des classes de Muckenhoupt (dont les propriétés utilisées sont rappelées dans l'annexe B). De plus, nous obtenons un résultat partiel d'unicité sur ces approximations.La première partie est consacrée a l'étude d'un modèle scalaire ayant les mêmes propriétés que celui celui des équations de Navier-Stokes (invariances par translation et dilatation, antisymétrie du terme bilinéaire) mais contenant un opérateur d'intégrale singulière : nous revisitons les techniques habituelles (solutions "mild", faibles) et construisons une solution vérifiant une inégalité d'énergie locale analogue à celle des équations de Navier-Stokes. / We study some approximations for the Navier-Stokes equations compatible with the research of self-similar solutions : for this, we use some scaling and energy equality preserving models. When initial data is in L2, we show that the model converges towards some (Leray) weak solution of the Navier-Stokes equations. In the proof, we use a new (local) expression of the pressure, whose control is ensured using the maximal regularity for the heat kernel thanks to the formalism of mild solutions. The following chapters are devoted to the construction of a global-in-time suitable solution for the Navier-Stokes equations, when initial data is in _M 2;3 : Muckenhout classes allow to control the pressure (see Annex B). Besides, we obtain a partial result of uniqueness of these approximations. In the first part, we study a scalar model whose properties are similar to the NS equations (invariance by translations and dilations, antisymmetry of the bilinear term) but which contains a singular integral operator : using on some classical harmonic analysis tools (mild and weak solutions), we prove that the solution also satisfies a local energy inequality.

Cette recherche, appliquée au contexte de la vente à distance, a pour objet l'étude de l'adaptabilité des offres promotionnelles à travers la gestion de l'hétérogénéité non-observée dans les réponses des clients. Pour cela, notre revue de littérature s'intéresse aux concepts attitudinaux du comportement de réponse d'un client ainsi qu'aux modèles de typologies des clientèles et des offres. Nous développons des classes d'offres promotionnelles permettant de regrouper simultanément les clients d'une entreprise et les offres auxquelles ils répondent. Puis, nous étudions les effets des dimensions sous-jacentes révélées par la typologie des offres, telles que l'attractivité perçue des offres et la propension d'un client à répondre aux promotions sur la réponse. Sur le plan méthodologique, nous avons recours à une classification des offres promotionnelles réalisée à partir de la méthode de classification par les classes latentes. De plus, nous employons une modélisation structurelle pour étudier l'influence des concepts latents sur ces classes d'offres. Les résultats de la recherche montrent, qu'au sein d'une clientèle d'entreprise de vente à distance, il subsiste des classes d'individus prédisposés à répondre à des offres considérées comme ayant un attrait similaire. La recherche conclue que l'attractivité perçue des offres et la propension à répondre aux promotions représentent deux concepts latents, distincts et influençant simultanément la réponse d'un client à une proposition commerciale. Sur la base de ces résultats, il est permis d'identifier plusieurs contributions ainsi que diverses voies de recherche futures. / This research, applied to the context of mail-order business, focuses on the adaptability of promotional offers through the management of unobserved heterogeneity in customers' responses. Thus, our Iiterature review is dedicated to the attitudinal concepts of customers' response behaviour, as weil as to the existing segmentation models of customers and offers. We develop classes of promotional offers allowing to simultaneously regrouping the customers and the offers to which they respond. Then, we investigate the effects of latent dimensions revealed by the offer segmentation, such as the attractiveness of promotions and the deal proneness of customers on the response. From a methodological point of view, we use a latent classes based method for classifying the promotional off ers. Moreover, we employa structural model to study the influence of the latent concepts on the classes of promotional off ers. The results of the research reveal, within customers of mail-order business company, there remains individual classes prone to the off ers considered as having a similar attraction. According to the conclusions of this research, the attractiveness of promotions and the deal proneness represent two distinct latent concepts simultaneously influencing customers' response to promotional off ers. Based upon these results, it is possible to identify several contributions. Directions for future research are then proposed.

Thèses (M.A.)--Université de Sherbrooke (Canada), 2006. / Titre de l'écran-titre (visionné le 23 oct. 2007). In ProQuest dissertations and theses. Publié aussi en version papier.

Thesis--Wisconsin. / Vita. Includes bibliographical references (leaves 486-504).

Thesis (M.S.)--University of Wisconsin--Madison, 1981. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 66-67).

Thesis (M.S.)--University of Wisconsin--Madison, 1975. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (M.A.)--University of Wisconsin--Madison, 1973. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Inaug.-diss.--Kiel. / Lebenslauf. "Literatur": p. ix-xii.

Orientador: Jair Pinheiro / Banca: Angélica Lovatto / Banca: Lúcio Flávio Rodrigues de Almeida / Resumo: O fim do regime militar e a ascensão de novas forças sociais na sociedade brasileira possibilitaram o desenvolvimento de uma concepção de participação popular que indicava a necessidade de organização das "massas exploradas" através dos conselhos populares, órgãos de participação direta onde os trabalhadores poderiam tomar as decisões sobre a sociedade. No entanto, constata-se que as transformações engendradas pela nova correlação de forças nacionais e internacionais, no decorrer dos anos 1990, apontam um panorama defensivo para os setores que postulavam as teses da participação e organização popular. A ofensiva política e ideológica do neoliberalismo, associada às transformações programáticas de partidos de esquerda como o PT, ensejam a criação de novas "práticas participativas". Estas novas práticas são apropriadas e redefinidas por segmentos conservadores, além de estimuladas pelos agentes do capital financeiro internacional; e passam a ter um caráter mais gerencialista do que transformador. Neste sentido, este estudo tem por objetivo a análise das metamorfoses que constituem a noção de participação popular e seu desenvolvimento no Partido dos Trabalhadores, suas continuidades e rupturas, bem como suas interconexões com as mudanças programáticas do partido / Abstract: The end of military regime and the rise of new social forces in Brazilian society facilitated the development of a conception of popular participation which indicated the need for organization of the "exploited masses" through the popular councils, direct participation organisms where workers could take the decisions on society. However, it appears that the changes engendered by the new correlation of forces nationally and internationally, over the years 1990, indicate a defensive outlook for the sectors that postulated the thesis of popular participation and organization. The political and ideological offensive of neoliberalism, programmatic changes associated with left-wing parties like the PT have inspired the creation of new "participatory practices". These new practices are appropriated and redefined by conservative segments, stimulated by the agents of international finance capital, and now they have a more managed than a processor one. Thus, this study aims to analyze the transformations that constitute the notion of popular participation and development in the Worker's Party, its continuities and ruptures, as well as its interconnections with the party's programmatic changes / Mestre

Thesis (M.S.)--University of Wisconsin--Madison, 1968. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.