La prédominance de l’informel dans l’économie d’Haïti, où plus de 80% de la population vit en dessous du seuil de la pauvreté et plus de 35% au chômage, laisse entrevoir des liens étroits entre l’économie informelle, la pauvreté et le marché du travail. Faire ressortir ces interrelations, exige une évaluation de cette économie informelle qui fait l’objet des quatre chapitres de notre thèse traitant successivement l’évolution de la situation macroéconomique, le capital humain, les gains des travailleurs informels, et la segmentation du marché du travail.Le premier chapitre fait un diagnostic du phénomène selon l’état des lieux des théories élaborées et l’évolution du cadre macro-économique d’Haïti de 1980 à 2010 et propose une évaluation macroéconomique de l’informel à partir d’un modèle PLS (Partial Least Squares) en pourcentage du PIB.Le chapitre deux établit les relations entre l’évolution de l’économie informelle, dérégulation et politiques néolibérales grâce à un modèle LISREL (Linear Structural Relations). Nous examinons les incidences des politiques fiscales, budgétaires et monétaires des 30 dernières années sur l’économie informelle. Nous réévaluons aussi les causes de l’évolution de l’informel généralement évoquées par les études empiriques (taxes, sécurité sociale).Au chapitre trois, nous analysons la dimension micro-réelle de l’informel grâce à un modèle des gains à la Mincer estimé par les équations logit à partir des données d’une enquête nationale sur l’emploi et l’économie informelle (EEEI) de 2007. Nous analysons les déterminants des gains informels au regard de la position des travailleurs sur le marché (salariés, entrepreneurs et indépendants) ; et les revenus (formels et informels) et les caractéristiques socioéconomiques des travailleurs pauvres et non-pauvres par rapport au seuil de pauvreté.Au chapitre quatre, nous testons d’abord la compétitivité et la segmentation du marché de l’emploi en faisant usage de modèle de Roy et du modèle de Roy élargi à travers une estimation d’un modèle Tobit. Nous utilisons un modèle de Processus de Dirichlet : d’abord analyser la segmentation et la compétitivité éventuelle du marché du travail informel ainsi que ses déterminants, selon les données de l’EEEI-2007 ; ensuite, pour distinguer les caractéristiques fondamentales des informels involontaires (exclus du marché du travail formel) de celles des informels volontaires qui en retirent des avantages comparatifs. / The predominance of the informal sector in the economy of Haiti, where more than 80% of the population lives below the threshold of poverty and more than 35% unemployed, suggests links between the informal economy, poverty and the labour market. Highlight these interrelationships, requires an assessment of the informal economy, which is the subject of the four chapters of this thesis, dealing successively with the evolution of the macroeconomic situation, human capital, the informal earnings of workers, and the segmentation of the labour market.The first chapter made a diagnosis of the phenomenon according to the State of affairs of the developed theories and the evolution of the macroeconomic framework of Haiti from 1980 to 2010. And then offers a macroeconomic assessment of the informal sector as a percentage of GDP from a PLS (Partial Least Squares).Chapter two sets out the relationship between the evolution of the informal economy, deregulation and neo-liberal policies through a LISREL (Linear Structural Relations) model. We look at the impact of the budgetary, fiscal and monetary policies of the past 30 years on the informal economy. We also reassess the causes of the evolution of the informal economy generally evoked by the empirical studies (taxes, social security).In the chapter three, we analyse the micro-real dimension of the informal economy through a model of the Mincer earnings estimated by the equations logit from data in a national survey on employment and the informal economy (EEEI) in 2007. We analyse the determinants of informal gains in terms of the position of the market workers (employees, entrepreneurs and self-employed); and revenues (formal and informal) and the socio-economic characteristics of the working poor and non-poor compared to the poverty line.In chapter four, we first test the competitiveness and the segmentation of the labour market by making use of model of Roy and the expanded Roy model through an estimate a model Tobit. We use a model of Dirichlet process: first analyse the segmentation and possible informal work and market competitiveness as its determinants, according to data from the EEEI 2007; then, to distinguish the fundamental characteristics of the involuntary informal (excluded from the formal labour market) than the voluntary informal who gain comparative advantages.

Made available in DSpace on 2016-10-13T14:09:56Z (GMT). No. of bitstreams: 1 Rodrigo Esteves Tafner.pdf: 1848105 bytes, checksum: fbc7441faa379809b7a60c24b9ca92db (MD5) Previous issue date: 2014-04-09 / This study aims to provide a predictive model of degree of adaptation required for the entry of a particular product in a particular target market, pointing to a position on a continuum of standardization / adaptation based on the contingency view particularly Jain, through the analysis of relationship indicators formed from secondary data and public access. To achieve this goal, a theoretical review pointed constructs not only Internationalization, but Organizational Psychology, and the Cultural Distance Hofstede, the gravitational theory proposed by authors such as Retail Reiley, Converse Huff and that should be integrated in a formative model predicting the degree of adaptation of the International Offering. The resulting theoretical model from the literature review was put to the test with data obtained from secondary databases as the Best Global Brands Ranking, GMID - Euromonitor and Global UN HDI and compared to data obtained using the Delphi method, in which 18 judges internationalization experts judged ex -post adjustment of 48 cases, 7 products in 6 countries over 1 item in only 6 of the 7 countries, by means of Partial Least Squares method - Structural Equation Modeling. The results point to a model with a high degree of prediction, with significance, after removing the bookmark Monetary Value of Brand originally proposed theoretical model. The final model, however can not be generalized because the study investigated some representative group of the population, but offers prospects for expansion of research is the expansion of the sample and the databases used either by the method of regression analysis in Multilevel function of the multi-stage characteristic of the sample. / Este estudo objetiva oferecer um modelo preditivo de grau de adaptação necessária para a entrada de um determinado produto em um determinado mercado-alvo, apontando uma posição em um contínuo de padronização/ adaptação baseado na visão contingencialista, principalmente de Jain, por meio da análise da relação de indicadores formados a partir de dados secundários e de acesso público. Para atingir esse objetivo, uma revisão teórica apontou constructos não só de Internacionalização, mas de Psicologia Organizacional, como a Distância Cultural de Hofstede, da Teoria Gravitacional do Varejo proposto por autores como Reiley, Converse e Huff que deveriam se integrar em um modelo formativo de predição do Grau de Adaptação da Oferta Internacional. O modelo teórico resultante da revisão da literatura foi posto à prova com dados obtidos de bases de dados secundários como o Ranking Best Global Brands, GMID Euromonitor e IDH global da ONU e confrontados com dados obtidos por meio do método Delphi, no qual 18 juízes especialistas em internacionalização julgaram ex-post, a adaptação de 48 casos, 7 produtos em 6 países mais 1 produto em somente 6 dos 7 países, por meio do método Partial Least Squares Structural Equation Modeling. Os resultados apontaram para um modelo com alto grau de predição, com significância, após a retirada do indicador Valor Monetário da Marca do modelo teórico originalmente proposto. O modelo final, entretanto não pode ser generalizado pois a pesquisa investigou um grupo pouco representativo da população, mas oferece perspectivas de ampliação da pesquisa seja pela ampliação da amostra e das bases de dados utilizados, seja por meio do método de análise de Regressão Multinível em função da característica multi-estágio da amostra.

O presente trabalho trata-se de um estudo de caso múltiplo de natureza quantitativa. Trata-se de um estudo descritivo em função da comparação e análise dos projetos de arquitetura e explicativo em função da aplicação da modelagem em equação estrutural. Foram visitados e analisados os centros de pesquisas: (A) Instituto Max Planck de Ecologia Química, localizado em Jena, Alemanha; (B) Instituto Max Planck de Antropologia Evolutiva, localizado em Leipzig, Alemanha; (C) Instituto Max Planck de Biologia e Genética de Célula Molecular, localizado em Dresden, Alemanha; (D) Instituto de Biociência, localizado em Liverpool, Inglaterra. Procedeu-se a aplicação de um questionário, para avaliar a percepção dos usuários com relação aos fatores que caracterizam os ambientes de trabalho e que se relacionam com a satisfação pelo ambiente físico. Os fatores extraídos da literatura e analisados foram: interação, privacidade, flexibilidade e percepção de conforto. Analisando as características físicas de cada edifício e os resultados do questionário, constata-se que estas características de fato têm sido percebidas pelos usuários. As evidências empíricas obtidas através do modelo de equação estrutural indicam: (1) que existe uma relação positiva entre condição física para interação e satisfação com o ambiente físico; (2) que existe uma relação positiva entre percepção de conforto e satisfação com o ambiente físico; (3) que existe uma relação positiva entre condição física para interação e condição física para privacidade. / This paper consists of a quantitative multiple case study presenting a descriptive analysis based on comparisons and examinations of architectural project designs, with an explanation of the structural equation modelling application. The following research centres were visited and analysed: (A) Max Planck Chemical Ecology Institute, Jena, Germany; (B) Max Planck Evolutionary Anthropology Institute, Leipzig, Germany; (C) Max Planck Biology and Molecular Cell Genetics Institute, Dresden, Germany; (D) Bioscience Institute, Liverpool, UK. A questionnaire was completed in order to assess user perceptions of factors characterising their work environments, related to satisfaction with their physical surroundings. The factors taken from the literature and analysed were: Interaction, Privacy, Flexibility and Perception of Comfort. Analyses of the physical characteristics of each building and the findings of the questionnaire clearly demonstrate that these characteristics are really perceived by their users. Empirical evidence obtained through the structural equation model indicates that: (1) there is a positive relationship between physical conditions conducive to interaction and satisfaction with physical surroundings; (2) there is a positive relationship between perception of comfort and satisfaction with physical surroundings; (3) there is a positive relationship between physical conditions conducive to interaction and physical conditions providing privacy.

Diferentes abordagens teóricas têm sido utilizadas em estudos de sistemas biomoleculares com o objetivo de contribuir com o tratamento de diversas doenças. Para a dor neuropática, por exemplo, o estudo de compostos que interagem com o receptor sigma-1 (Sig-1R) pode elucidar os principais fatores associados à atividade biológica dos mesmos. Nesse propósito, estudos de Relações Quantitativas Estrutura-Atividade (QSAR) utilizando os métodos de regressão por Mínimos Quadrados Parciais (PLS) e Rede Neural Artificial (ANN) foram aplicados a 64 antagonistas do Sig-1R pertencentes à classe de 1-arilpirazóis. Modelos PLS e ANN foram utilizados com o objetivo de descrever comportamentos lineares e não lineares, respectivamente, entre um conjunto de descritores e a atividade biológica dos compostos selecionados. O modelo PLS foi obtido com 51 compostos no conjunto treinamento e 13 compostos no conjunto teste (r² = 0,768, q² = 0,684 e r²teste = 0,785). Testes de leave-N-out, randomização da atividade biológica e detecção de outliers confirmaram a robustez e estabilidade dos modelos e mostraram que os mesmos não foram obtidos por correlações ao acaso. Modelos também foram gerados a partir da Rede Neural Artificial Perceptron de Multicamadas (MLP-ANN), sendo que a arquitetura 6-12-1, treinada com as funções de transferência tansig-tansig, apresentou a melhor resposta para a predição da atividade biológica dos compostos (r²treinamento = 0,891, r²validação = 0,852 e r²teste = 0,793). Outra abordagem foi utilizada para simular o ambiente de membranas sinápticas utilizando bicamadas lipídicas compostas por POPC, DOPE, POPS e colesterol. Os estudos de dinâmica molecular desenvolvidos mostraram que altas concentrações de colesterol induzem redução da área por lipídeo e difusão lateral e aumento na espessura da membrana e nos valores de parâmetro de ordem causados pelo ordenamento das cadeias acil dos fosfolipídeos. As bicamadas lipídicas obtidas podem ser usadas para simular interações entre lipídeos e pequenas moléculas ou proteínas contribuindo para as pesquisas associadas a doenças como Alzheimer e Parkinson. As abordagens usadas nessa tese são essenciais para o desenvolvimento de novas pesquisas em Química Medicinal Computacional. / Different theoretical approaches have been used in the studies of biomolecular systems aiming to contribute with the treatment of several diseases. For neuropathic pain, for example, the study of compounds that interact with sigma-1 receptor (Sig-1R) can elucidate the main factors associated to their biological activities. For this purpose, studies of Quantitative Structure-Activity Relationships (QSAR) using Partial Least Squares (PLS) and Artificial Neural Network (ANN) methods were applied to 64 Sig-1R antagonists belong to 1-arylpyrazole class. PLS and ANN models were used in order to describe linear and nonlinear behavior, respectively, between a set of descriptors and the biological activity of the selected compounds. The PLS model was obtained with 51 compounds in the training set and 13 compounds in the test set (r² = 0.768, q² = 0.684 and r²test = 0.785). Leave-N-out tests, biological activity randomization and outliers detection confirmed the robustness and stability of the models and showed that they were not obtained by chance correlations. Models were also generated from Multilayer Perceptron Artificial Neural Network (MLP-ANN) and the 6-12-1 architecture, trained by tansig-tansig transfer functions, showed the best result for the biological activity prediction of the compounds (r²training = 0.891, r²validation = 0.852 and r²test = 0.793). Another approach was used to simulate synaptic membranes environment using lipid bilayers composed by POPC, DOPE, POPS and cholesterol. Performed molecular dynamics studies showed that high cholesterol concentration induces decrease of area per lipid and lateral diffusion and increase of membrane thickness and order parameter caused by ordering of phospholipids acil chains. The obtained lipid bilayers can be used to simulate interactions between lipids and small molecules or proteins contributing for researches associated to Alzheimer and Parkinson diseases. The approaches used in this thesis are essential for the development of new researches in Computational Medicinal Chemistry.

O presente trabalho trata-se de um estudo de caso múltiplo de natureza quantitativa. Trata-se de um estudo descritivo em função da comparação e análise dos projetos de arquitetura e explicativo em função da aplicação da modelagem em equação estrutural. Foram visitados e analisados os centros de pesquisas: (A) Instituto Max Planck de Ecologia Química, localizado em Jena, Alemanha; (B) Instituto Max Planck de Antropologia Evolutiva, localizado em Leipzig, Alemanha; (C) Instituto Max Planck de Biologia e Genética de Célula Molecular, localizado em Dresden, Alemanha; (D) Instituto de Biociência, localizado em Liverpool, Inglaterra. Procedeu-se a aplicação de um questionário, para avaliar a percepção dos usuários com relação aos fatores que caracterizam os ambientes de trabalho e que se relacionam com a satisfação pelo ambiente físico. Os fatores extraídos da literatura e analisados foram: interação, privacidade, flexibilidade e percepção de conforto. Analisando as características físicas de cada edifício e os resultados do questionário, constata-se que estas características de fato têm sido percebidas pelos usuários. As evidências empíricas obtidas através do modelo de equação estrutural indicam: (1) que existe uma relação positiva entre condição física para interação e satisfação com o ambiente físico; (2) que existe uma relação positiva entre percepção de conforto e satisfação com o ambiente físico; (3) que existe uma relação positiva entre condição física para interação e condição física para privacidade. / This paper consists of a quantitative multiple case study presenting a descriptive analysis based on comparisons and examinations of architectural project designs, with an explanation of the structural equation modelling application. The following research centres were visited and analysed: (A) Max Planck Chemical Ecology Institute, Jena, Germany; (B) Max Planck Evolutionary Anthropology Institute, Leipzig, Germany; (C) Max Planck Biology and Molecular Cell Genetics Institute, Dresden, Germany; (D) Bioscience Institute, Liverpool, UK. A questionnaire was completed in order to assess user perceptions of factors characterising their work environments, related to satisfaction with their physical surroundings. The factors taken from the literature and analysed were: Interaction, Privacy, Flexibility and Perception of Comfort. Analyses of the physical characteristics of each building and the findings of the questionnaire clearly demonstrate that these characteristics are really perceived by their users. Empirical evidence obtained through the structural equation model indicates that: (1) there is a positive relationship between physical conditions conducive to interaction and satisfaction with physical surroundings; (2) there is a positive relationship between perception of comfort and satisfaction with physical surroundings; (3) there is a positive relationship between physical conditions conducive to interaction and physical conditions providing privacy.

La proximité constitue l’une des préoccupations stratégiques actuelles majeures de la distribution alimentaire. Cette recherche porte sur les raisons de la réhabilitation des formats de proximité et s’intéresse aux représentations de la proximité d’un magasin par les distributeurs et par les consommateurs. Il ressort des analyses qualitatives et quantitatives menées auprès des distributeurs et des consommateurs que cette distance spatiale, temporelle, fonctionnelle et social qui unit un magasin et ses clients est multidimensionnelle. Sept dimensions ont été identifiées : la proximité d’accès, la proximité fonctionnelle, la proximité de processus, la proximité relationnelle, la proximité identitaire, la proximité d’intégration et la proximité d’assortiment. Certains points de convergence et divergence apparaissent dans les représentations de la proximité d’un magasin par les distributeurs et les consommateurs. Plus généralement, tous deux perçoivent les aspects symboliques et fonctionnels du magasin de proximité. Les représentations de la proximité d’un magasin du point de vue des distributeurs sont plus complètes et positives ; les consommateurs se concentrent davantage sur les aspects fonctionnels et utilitaires du magasin de proximité. Le test des hypothèses du modèle théorique (PLS) nous amènent finalement à identifier les antécédents de la proximité perçue d’un magasin (positionnement perçu et localisation géographique) et ses conséquences (intentions d’achat futures, évaluation positive et attachement). Nos résultats démontrent que la localisation géographique ne suffit pas à créer une relation entre client et le magasin. Le distributeur ne doit pas se contenter d’être géographiquement près de son client pour être proche de lui ; il doit dépasser la vision géographique de la proximité pour valoriser d’autres aspects fonctionnels et symboliques / Getting close to the consumer is one major concern in retailing. This research tries to understand the rehabilitation of small food stores in the French retailing context and explores the notion of closeness in all in its dimensions from a retailer as well as a consumer perspective. The research involves data collection from both retail companies and consumers. The qualitative and quantitative analysis show that creating closeness with the customer can be defined as the management of the spatial, temporal, functional and social distance that links a store to its customers. Seven dimensions can be identified: the access closeness, the functional closeness, the process closeness, the relational closeness, the identity closeness, the integration closeness and the assortment closeness. Some convergence or difference points between the retailers and the consumers perceptions can be describe. In general, managers and consumers both establish a dichotomy between practical and symbolic aspects of closeness. We can observe that managers see the relationship between the store and its clients in a more positive and global way whereas consumers are more rational and focus on practical elements. The tests of the hypothesis show us that the retailer image and the geographical location of the store have both a positive effect on perceived closeness to a store. Also, perceived closeness to a store increases consumer’s loyalty to the store. Our results demonstrate that location of the store is not enough to create a close relationship between the customer and the store; the closeness between a customer and a store is not only based on a spatial distance but also on a temporal, functional and social distance. Being close to its consumers not only means being close to them geographically. The consumer prefers a broader vision of closeness including practical and symbolic aspects

L’objectif de cette thèse consiste en l’élaboration de deux méthodologies visant à révéler des effets jusqu’alors masqués en modélisation décisionnelle. Dans la première partie, nous cherchons à mettre en œuvre une méthode d’analyse locale des critères de choix dans un contexte de choix binaires. Dans une seconde partie, nous mettons en avant les effets de génération dans l’étude des comportements de choix. Dans les deux parties, notre démarche de recherche combine de nouveaux outils d’analyse prédictive (Support Vector Machines, FANOVA, PLS) aux outils traditionnels de statistique inférentielle, afin d’enrichir les résultats habituels par des informations complémentaires sur les effets masqués que constituent les effets locaux dans les fonctions de choix binaires, et les effets de génération dans l’analyse temporelle des comportement de choix. Les méthodologies proposées, respectivement nommées AEL et APC-PLS, sont appliquées sur des cas réels, afin d’en illustrer le fonctionnement et la pertinence. / The objective of this thesis is the development of two methodologies to reveal previously hidden effects in decision modeling. In the first part, we try to implement a method of local analysis in order to select criteria in the context of binary choices. In a second part, we highlight the effects of generations in the study of consumer behavior. In both parts, our research approach combines new predictive analytical tools (such as Support Vector Machines, FANOVA, PLS) to traditional tools of inferential statistics, to enrich the usual results by additional on the masked effects, which are the local effects in the binary choice functions, and the effects of generation in temporal choice behavior analysis.The proposed methodologies, respectively named AEL and APC- PLS are both applied to real cases in order to illustrate their operation and relevance.

Nos últimos anos, a incorporação de partículas inorgânicas em uma matriz polimérica com a finalidade de se obter sistemas híbridos orgânico/inorgânico utilizando diferentes técnicas de polimerização tem recebido grande atenção. Neste sentido, preservar e controlar as propriedades físico-químicas das partículas inorgânicas torna-se essencial para manter a integridade destas em nanoescala, bem como para obtenção de dispersões uniformes, magnificando os efeitos de reforço e demais ganhos de propriedades desejadas para a matriz polimérica. Quando se utiliza partículas inorgânicas anisotrópicas tais como a montmorilonita, silicato lamelar mais utilizado para obtenção de nanocompósitos do tipo polímero/silicato lamelar, este controle apresenta-se como um problema particularmente desafiador. Nesse contexto, a polimerização radicalar controlada (PRC) vem se destacando como uma importante via para atingir os objetivos mencionados acima, encontrando-se na literatura diversas estratégias de síntese em meio a solventes orgânicos na qual a efetiva nanoencapsulação de partículas inorgânicas dá-se por meio do crescimento de cadeias poliméricas na superfície destas estruturas inorgânicas. Entretanto, poucos trabalhos são encontrados envolvendo rota de obtenção semelhante em meio aquoso, tais como suspensão, emulsão e miniemulsão, processos estes que possuem grande interesse industrial, ambiental e viabilidade real de ampliação de escala quanto à produção.Desta forma, o objetivo deste projeto de pesquisa concentra-se na síntese e na caracterização de nanocompósitos do tipo polímero/silicato lamelar via polimerização radicalar controlada em emulsão. As polimerizações radicalares controladas de estireno em emulsão, via mecanismo de transferência reversível de cadeia por adição-fragmentação (RAFT), foram conduzidas na presença de argila montmorilonita (MMT) e mediadas por dois macroagentes de transferência de cadeia com grupo funcional tri-tioéster, sendo o primeiro constituído de cadeia polimérica não iônica de monoetil éter de poli(etilenoglicol) (MPEG-CPP) e outro derivado do MPEG-CPP contendo adicionalmente um bloco ionizável de poli(ácido metacrílico) incorporado à cadeia polimérica (MPEG-b-PMAA-CPP). Foram avaliados inicialmente os parâmetros de adsorção dos macroagentes MPEG-CPP e MPEG-b-PMAA-CPP na superfície da MMT bem como a influência das variáveis do processo de polimerização na adsorção dos macroagentes na MMT e na estabilidade coloidal dos complexos macroagente RAFT / MMT formados. Posteriormente foram avaliados os efeitos do pH, das concentrações dos macroagente RAFT e de MMT, bem como do tipo de iniciador na cinética de polimerização em emulsão \"ab-initio\" de estireno, conduzidas na ausência de surfatantes. As técnicas utilizadas nos estudos de adsorção e para a caracterização das argilas, dos látices híbridos e dos materiais nanocompósitos incluem: espectroscopia de UV-vis, espalhamento dinâmico de luz (DLS), espalhamento eletroforético de luz (ELS), cromatografia de permeação em gel (GPC), análise termogravimétrica (TGA), calorimetria diferencial de varredura (DSC) e microscopia eletrônica de transmissão (TEM). / In recent years, the incorporation of inorganic particles in a polymer matrix in order to obtain hybrid organic/inorganic systems using different polymerization techniques have received great attention. In this sense, preserve and manage the physical and chemical properties of inorganic particles is essential to maintain its integrity at the nanoscale, as well as to obtain uniform dispersions of them, magnifying the effects of reinforcement and other desired properties into the polymer matrix. When using anisotropic inorganic nanoobjects such as montmorillonite, the most used layered silicate to obtain polymer / layered silicate nanocomposites, this control is presented as a particularly challenging problem. In this context, the controlled radical polymerization (CRP) has been highlighted as an important way to achieve the goals mentioned above, several strategies of organic solvent-borne synthesis can be found in literature in which the effective nanoencapsulation of inorganic particles is given by through the growth of polymer chains on the surface of these inorganic structures. However, few works are found involving obtaining similar route in water-borne, such as suspension, emulsion, miniemulsion, these procedures have great interest in industrial, environmental and actual feasibility of expanding scale in manufacture. Thus, the objective of this research project focuses on the synthesis and characterization of nanocomposite-type polymer / layered silicate via controlled radical polymerization in emulsion media. The controlled radical polymerizations in emulsion, via transfer mechanism for the reversible addition-fragmentation chain (RAFT) have been conducted in the presence of montmorillonite clay (MMT) and mediated by two macroRAFT agents with functional tri-thioesters groups, being the first one constituted by a nonionic poly(ethylene glycol) methyl ether polymeric chain (MPEG-CPP) and the second on being MPEG-CPP derived but containing additionally an ionizable block of poly(methacrylic acid) inserted to its polymeric chain. The parameters of adsorption of MPEG-CPP and MPEG-b-PMAA-CPP agent on the surface of MMT as well as the influence of the polymerization process variables on the adsorption of PEO-RAFT in MMT and colloidal stability of the complex formed macroRAFT agents / MMT were firstly evaluated. Subsequently, the influence of pH, macroRAFT agents and MMT concentrations as well as the type of initiator on the kinetics of RAFT emulsion polymerization were equally evaluated. The techniques used the for adsorption studies and characterization of clays, latexes of hybrid materials and nanocomposites include: UV-vis spectroscopy, dynamic light scattering (DLS), electrophoretic light scattering (ELS), gel permeation chromatography (GPC), thermogravimetric analysis (TGA), dynamic scanning calorimetry (DSC) and transmission electron microscopy (TEM).

Made available in DSpace on 2014-12-17T15:41:52Z (GMT). No. of bitstreams: 1 MariaRCI_DISSERT.pdf: 3251511 bytes, checksum: ea24e2034f12435ffe63fbcaee9ff544 (MD5) Previous issue date: 2010-02-24 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / In this work we used chemometric tools to classify and quantify the protein content in samples of milk powder. We applied the NIR diffuse reflectance spectroscopy combined with multivariate techniques. First, we carried out an exploratory method of samples by principal component analysis (PCA), then the classification of independent modeling of class analogy (SIMCA). Thus it became possible to classify the samples that were grouped by similarities in their composition. Finally, the techniques of partial least squares regression (PLS) and principal components regression (PCR) allowed the quantification of protein content in samples of milk powder, compared with the Kjeldahl reference method. A total of 53 samples of milk powder sold in the metropolitan areas of Natal, Salvador and Rio de Janeiro were acquired for analysis, in which after pre-treatment data, there were four models, which were employed for classification and quantification of samples. The methods employed after being assessed and validated showed good performance, good accuracy and reliability of the results, showing that the NIR technique can be a non invasive technique, since it produces no waste and saves time in analyzing the samples / Neste trabalho foram utilizadas ferramentas quimiom?tricas para classificar e quantificar o teor de prote?nas em amostras de leite em p?. Empregou-se a espectroscopia NIR com reflect?ncia difusa associada a t?cnicas multivariadas. Primeiramente, realizou-se um m?todo explorat?rio das amostras atrav?s da an?lise das componentes principais (PCA),em seguida a classifica??o de modelagem independente para analogia de classes (SIMCA). Dessa forma se tornou poss?vel classificar as amostras que se agruparam por semelhan?as em sua composi??o. Por fim, as t?cnicas de regress?o por m?nimos quadrados parciais (PLS) e regress?o por componentes principais (PCR) permitiram a quantifica??o do teor de prote?nas nas amostras de leite em p?, comparadas com o m?todo de refer?ncia Kjeldahl. Um total de 53 amostras de leite em p? comercializadas nas regi?es metropolitanas de Natal, Salvador e Rio de Janeiro foram adquiridas para an?lise, em que ap?s pr?-tratamento dos dados obtidos, foram encontrados quatro modelos, os quais empregaram-se para a classifica??o e quantifica??o das amostras. Os m?todos empregados ap?s serem avaliados e validados apresentaram bom desempenho, demonstrando exatid?o e confiabilidade nos resultados obtidos, mostrando que a t?cnica NIR pode ser uma t?cnica n?o invasiva, uma vez que n?o produz res?duos e ainda economiza tempo na an?lise das amostras

Ce travail concerne les analyses multi-tableaux de données et plus particulièrement la régression. Présentées sous forme d'un recueil, nous exposons un grand nombre de méthodes peu connues pour la majorité, pour l'analyse des multi-tableaux.<br /><br />Notre travail se compose de trois parties. La première partie, contenant sept chapitres, expose les méthodes de modélisation linéaires. Elles sont classées par type d'analyse (conjointe ou régression) et par domaine d'application (cube ou multi-tableaux). Nous en introduisons plusieurs nouvelles de type PLS, basées sur l'optimisation d'un critère sous contraintes par étape, pour analyser simultanément un (ACIMO) ou plusieurs (ACIMOG1,2, 3) ensembles de tableaux, pour modéliser un ensemble de tableaux par un autre (ACIMO-PLS, ACIMOG-PLS1,2 3, REMUB) et appliquons l'ACIMO à l'intrastructure de STATIS pour en améliorer les trajectoires. De plus, nous proposons une généralisation de la méthode STATIS au cas de deux ensembles de tableaux (DO-ACT), aussi basée sur l'optimisation d'un critère sous contraintes. <br /><br />Un chapitre est consacré à ce qui touche la pratique de ces méthodes, dans lequel nous abordons la question du choix de blocs explicatifs importants dans les modèles de régression multi-tableaux, qui n'a encore jamais été abordée. Nous proposons plusieurs critères pour répondre à cela.<br /><br />La seconde partie, moins importante en taille, concerne la modélisation non-linéaire en régression multi-tableaux. Après une revue des méthodes de régression PLS non-linéaire pour deux tableaux, nous introduisons deux méthodes (SARMUB1 et 2) pour la régression non-linéaire des multi-tableaux, basées sur la recherche de transformations splines des prédicteurs optimales. Enfin, nos méthodes, programmées en S-Plus, ayant pour but principal d'être appliquées, nous proposons dans la troisième partie les résultats de plusieurs applications dans divers domaines, tels que la chimiométrie, l'analyse sensorielle, l'écologie ...