Submitted by Caroline Xavier (caroline.xavier@pucrs.br) on 2017-06-30T13:27:41Z No. of bitstreams: 1 TES_NATALIA_FEIJO_LOPES_COMPLETO.pdf: 8285271 bytes, checksum: 119a9479b96dbe3b60816028d619c58d (MD5) / Made available in DSpace on 2017-06-30T13:27:41Z (GMT). No. of bitstreams: 1 TES_NATALIA_FEIJO_LOPES_COMPLETO.pdf: 8285271 bytes, checksum: 119a9479b96dbe3b60816028d619c58d (MD5) Previous issue date: 2017-03-24 / Conselho Nacional de Pesquisa e Desenvolvimento Cient?fico e Tecnol?gico - CNPq / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / Funda??o de Amparo ? Pesquisa do Estado do Rio Grande do Sul (FAPERGS) / For the oil industry, corrosion in steel is a serious problem, especially when in presence of aqueous environment and in contact with dissolved gases (CO2, H2S and O2). In cases exploration in pre-salt fields, corrosion control is even more critical, because the crude oil is extracted with high salinity and elevated CO2 content at high pressures and temperatures. Therefore, the objective of this work was to study the performance of steels used in wellbore casing (HSLA steels with 0.04% Cr and with 0.31% Cr and a superduplex steel) in a CO2 corrosive environment with a similar chemical composition to the pre-salt reservoirs, at high pressures (15 and 30 MPa) and high temperatures (50?C and 90?C). For this, batch corrosion tests, for 7 and 30 days, were performed and the assessment of the corrosion process was made through the characterization of the scales formed on the steel surface. Corrosion rates were determined by mass loss tests, the characterization of the corrosion products was made by FEG/SEM, EDS, XRD and Raman, and the properties of the corrosion products were evaluated by electrochemical measurements of potentiodynamic polarization resistance and electrochemical impedance. In addition, the in-situ corrosion process was carried out at atmospheric pressure and evaluated by means of electrochemical impedance spectroscopy (EIS) in order to compare with the results obtained at high pressures. The scales formed on the steel surface at high pressure are predominantly composed of iron carbonate enriched with calcium as substitutional element in the lattice and the results indicate that the scales that exhibited more protective properties were the ones formed at higher temperature (90?C). There was a significant improvement on the protection character of these scales with the increase of the chromium content, with special emphasis on the high performance of superduplex steel. Comparing EIS analyzes performed on pre-corroded steels with in-situ measurements, the results obtained by the measurements performed using pre-corroded samples were more coherent with the results obtained by the other evaluation methods. However, the in situ EIS measurement can be important to provide complementary information for the understanding of corrosion involving complex systems such as these studied. / Para a ind?stria petrol?fera, a corros?o em a?os ? um grave problema, principalmente quando em presen?a de meio aquoso e em contato com gases dissolvidos (CO2, H2S e O2). Em casos como no pr?-sal, o controle da corros?o ? ainda mais cr?tico, pois o petr?leo ? extra?do com ?gua de alta salinidade e elevado teor de CO2, a altas press?es e temperaturas. Desta forma, o objetivo deste trabalho foi estudar o desempenho de a?os utilizados em revestimento de po?os de petr?leo (a?os ARBL com 0,04% de Cr e com 0,31% de Cr e um a?o superduplex) frente ao ambiente corrosivo por CO2, com composi??o qu?mica similar ao pr?-sal, a altas press?es (15 e 30 MPa) e altas temperaturas (50?C e 90?C). Para isto, realizaram-se ensaios de corros?o em batelada, por 7 e 30 dias, e as an?lises do processo corrosivo foram realizadas a partir da caracteriza??o dos filmes de produto de corros?o formados na superf?cie do a?o ap?s os ensaios. As taxas de corros?o foram determinadas por perda de massa, a caracteriza??o dos produtos de corros?o foi realizada por FEG/MEV, EDS, DRX e Raman, e as propriedades eletroqu?micas dos produtos de corros?o foram avaliadas por resist?ncia de polariza??o potenciodin?mica e imped?ncia eletroqu?mica (EIS). Al?m disso, avaliou-se tamb?m o processo corrosivo in situ, por meio de espectroscopia de imped?ncia eletroqu?mica, em press?o atmosf?rica com a finalidade de comparar com os resultados obtidos a altas press?es. O produto de corros?o formado na superf?cie do a?o a alta press?o, para todas as condi??es experimentais, ? predominantemente composto por carbonato de ferro enriquecido por c?lcio substitucional e os resultados indicam que os filmes que apresentaram propriedades mais protetoras aos a?os foram os formados em temperatura mais alta (90?C). Houve uma melhora significativa no car?ter de prote??o destes filmes com o aumento do teor de cromo, com especial destaque ao elevado desempenho do a?o superduplex. Comparando as an?lises de EIS realizadas nos a?os pr?-corro?dos com as de in situ, observou-se que os resultados obtidos atrav?s das medidas realizadas nas amostras pr?-corro?das foram mais coerentes com os resultados obtidos pelos outros m?todos avaliativos. Por?m, a medida de EIS in situ pode ser importante para fornecer informa??es complementares para a compreens?o da corros?o envolvendo sistemas complexos como estes estudados.

Submitted by Jessica Alves (alves.jessica@ufba.br) on 2018-12-19T14:07:39Z No. of bitstreams: 1 TESE conferida para impressão 30 11 15.pdf: 5681431 bytes, checksum: 39a77906717f143604406b8eed48515c (MD5) / Approved for entry into archive by Jessica Alves (alves.jessica@ufba.br) on 2018-12-19T14:09:10Z (GMT) No. of bitstreams: 1 TESE conferida para impressão 30 11 15.pdf: 5681431 bytes, checksum: 39a77906717f143604406b8eed48515c (MD5) / Made available in DSpace on 2018-12-19T14:09:10Z (GMT). No. of bitstreams: 1 TESE conferida para impressão 30 11 15.pdf: 5681431 bytes, checksum: 39a77906717f143604406b8eed48515c (MD5) / A Baía de Todos os Santos (BTS), embora tenha sido designada, em 1999, como uma área de proteção ambiental, por ser um dos mais ricos ecossistemas marinhos brasileiros, desde 1960 vem sofrendo com intensa industrialização, e associado com ocrescimento populacional urbano, resultou em sua degradação ambiental. Por volta do ano de 2009, uma plataforma de petróleo foi implantada em São Roque do Paraguaçu, região próxima à Salinas da Margarida, despertando interesse em realizar maiores investigações nessa localidade. Macroalgas e macrófitas são utilizadas para monitoramento de metais em ambientes marinhos, por bioacumularem e biomagnificarem os elementos. Mariscos e peixes, pois, além disso, são capazes de fornecer informações sobre biodisponibilidade desses elementos. Entre os metais com maior potencial contaminante está o Hg, e em virtude da sua capacidade de acumulação ao longo da cadeia trófica, a determinação de sua concentração é importante, sobretudo para população que consome altas quantidades de frutos do mar, como as litorâneas. Assim, esta tese foi dividida em três partes, e objetiva determinar as concentrações dos elementos traço Ba, Cd, Co, Cr, Cu, Fe, Hg, Li, Mn, Mo, Ni, Pb, Sr, V e Zn em amostras de sedimentos, fanerógama marinha (Halodule wrightii), e três macroalgas (Padina sp., Caulerpa sp. e Hypnéia sp.), em sete localidades da Baía de Todos os Santos, Bahia, Brasil, e também em amostras de Anomalocardia brasiliana, Lucina pectinata, Callinetes sapidus, Bagre marinus e Diapterus sp. de Salinas da Margarida, cozidas e cruas.

Made available in DSpace on 2019-03-29T23:51:47Z (GMT). No. of bitstreams: 0 Previous issue date: 2014-11-03 / Study aimed to investigate how private security companies deal with the theme of spirituality. The research used the theoretical model of Ashmos and Duchon whom claimed that spirituality in the workplace is directly related to the principles of interior life, community and devoted to understand the meaning of work. We carried out surveys to 52 chief executive officers of private security companies based in the city of Fortaleza, Ceará State, following the method described by Likert (1932). There was not assumptions of croos-links between spirituality and religion along the interviews. Exploratory factorial analysis was used to determine how organizations realize spirituality among their employees. We have shown that organization's values were linked to spirituality and devoted to the community in 85.5 % of security companies. The use of principles of interior life or related to reinforce the understanding of the meaning of work were identified in 91.8% and 69.70% of companies, respectively. We conclude that employees of security companies recognize their interior life as part of their professional achievement. Additionally, they often link spirituality and religion and there is a feeling of accomplishment and connectivity of the building role of companies on understanding of spirituality in the workplace. / O presente estudo teve como objetivo investigar como as empresas de segurança privada tratam o tema da espiritualidade. A pesquisa utilizou o modelo teórico de Ashmos e Duchon, que compreende a espiritualidade no ambiente de trabalho como relacionada diretamente aos princípios de vida interior, comunidade e voltada para a compreensão do significado do trabalho. Foram aplicados questionários para 52 gestores executivos de empresas de segurança privada da cidade de Fortaleza, Ceará, seguindo o método de Likert (1932). Durante as entrevistas não se assumiu que havia conexão entre espiritualidade e religião. Para análise dos dados utilizou-se a técnica estatística de análise fatorial exploratória para determinar como as organizações percebem a espiritualidade entre seus empregados. Nós mostramos que os valores organizacionais foram associados à espiritualidade e voltados para a comunidade em 85,5 % das empresas de segurança. O uso de princípios de vida interior ou relacionados com o reforço do entendimento sobre o significado do trabalho foram identificados em 91,8 % e 69,7 % das companhias, respectivamente. Concluímos que o empregado de empresas de segurança reconhece sua vida interior como parte de sua realização profissional. Ainda, eles freqüentemente associam espiritualidade e religião, sendo que existe um sentimento de concretização e conectividade sobre o papel construtivo das companhias na compreensão da espiritualidade no ambiente corporativo.

This paper is primarily focused on developers wanting to learn the essentials of developing mainframe applications on the IBM`s Interactive System Productivity Facility (ISPF) platform. It describes the components of the ISPF environment, focusing mainly on the two components most used in mainframe application development: The ISPF Dialog Manager and the ISPF Program Development Facility (PDF). Second part of the paper is a hands-on tutorial, where the reader is guided trough the creation of a set of simple interactive ISPF applications, with focus on covering the most used features of the platform. Within the paper it is assumed that any reader interested in this topic has basic mainframe skills and knowledge, including user knowledge of ISPF PDF, as it is usually the primary tool for dataset manipulation and editing in the z/OS mainframe environment. A wider skill set is assumed for readers who want to go through the tutorial, for example REXX and z/OS assembler basics. However none of these skills are necessary, nor expected, from those who are mainly interested in finding out what ISPF is and what it can offer to z/OS applications and their developers.

The subject of this thesis is to compare the most widely used mobile operating systems from the perspective of the development, distribution and monetization of applications developed for these systems. Compared systems are Android, iOS, Symbian OS, Windows Phone and BlackBerry OS. The thesis defines a total of 16 criteria against which systems are compared. These criteria are further divided into three categories, namely SDK features, functionality and distribution and monetization. All criteria have assigned weights which are determined by the paired comparison method using the Fuller's triangle, which is part of the Annexes of this work. Practical part of this thesis is focused on determining the values of defined criteria. Each criterion is evaluated separately, including an analysis of results. The overall evaluation is performed in a separate part of the thesis and is composed by categories evaluation and overall evaluation.

The purpose of this study was to explore mechanisms through which high school students experience and cope with perceived discrimination and how discrimination and coping mechanisms relate to psychological distress and school engagement. Framed within transactional stress and coping and sociopolitical development theories, I tested a multiple mediation model with an ethnically diverse sample of public high school students (N = 979) and a subsample of Latina/o students (n = 433) to examine the mediating effects of three coping mechanisms (perceived social support, ethnic identity, and critical consciousness) on the relationship between perceived discrimination and the outcomes of psychological distress and school engagement. Additionally, psychological distress was examined as a mediator in the link between perceived discrimination and school engagement. Measurement and structural models were tested and demonstrated an adequate fit to the data. The hypothesized structural model accounts for 54% of the variance in school engagement and 31.2% of the variance in psychological distress in the full sample. The same model accounts for 63.4% of the variance in school engagement and 26.7% of the variance in psychological distress in the Latina/o subsample. A bootstrap analysis revealed that critical consciousness and perceived social support mediate the relationship between perceived discrimination and psychological distress in the full sample. Further, critical consciousness, ethnic identity, perceived social support, and psychological distress mediated the relationship between perceived discrimination and school engagement. A bootstrap analysis in the Latina/o subsample indicated that critical consciousness and psychological distress mediated the relationship between perceived discrimination and school engagement. While there are associated risks, the results highlight critical consciousness development as a protective racism-related coping mechanism for ethnically diverse adolescents and Latina/o youth in particular. Strengths, limitations, and implications of the study are discussed.

Tese de Mestardo. Engenharia de Segurança e Higiene Ocupacionais. Faculdade de Engenharia. Universidade do Porto. 2012

Tese de mestrado integrado. Engenharia Civil (Especialização em Hidráulica, Recursos Hídricos e Ambiente). Faculdade de Engenharia. Universidade do Porto. 2008

Com base nos dados obtidos no inventário que elaborámos dos monumentos sob tumulus no território entre o Corgo e o Tua, procurou-se analisar as relações entre os tumuli e o meio físico envolvente, nomeadamente a sua distribuição por patamares altimétricos, substrato geológico e categorias de implantação topográfica. Após uma integração cronológica dos monumentos escavados nesta região, é discutida a questão da localização dos habitats contemporÂneos destas construções tumulares, tendo sido calculados os territórios de exploração dos monumentos de dois conjuntos e avaliadas as potencialidades dos solos neles incluídos, baseados nas categorias de aptidão actuais, conjugadas com os dados paleoambientais. A análise destes resultados permitiu-nos elaborar algumas considerações sobre o tipo de recursos a que as comunidades construtoras destes monumentos teriam acesso e, consequentemente, sobre o tipo de economia que potencialmente praticavam.

Le besoin clinique de nouvelles stratégies pour pallier les limites des techniques actuelles dans le cas de régénération osseuse a permis l’émergence de l’ingénierie tissulaire osseuse. Les stratégies basées sur les techniques d’ingénierie tissulaire semblent être une alternative à l’utilisation de greffes et ainsi de s’affranchir des limites qu’elles présentent. L’approche adoptée dans le cadre de cette thèse consiste en le développement et l’utilisation d’hydrogels comme matériaux d’échafaudage pour le comblement et la régénération de tissus osseux. De nombreuses approches utilisant elles aussi des hydrogels existent, chacune possède ses avantages et limites. Dans ce contexte, nos travaux ont consisté en l’utilisation d’un hydrogel non-polymérique comme matériau de base dans le développement des stratégies. Brièvement, plusieurs types cellulaires sont présents au sein du tissu osseux et vont participer aux processus de formation et de régénération osseuse. L’objectif de nos stratégies a été l’apport de cellules souches exogènes puis leur différenciation en cellules ostéoformatrices, ou le recrutement et la différenciation des cellules de l’hôte en cellules ostéoformatrices. Le gel de GNF a été utilisé comme matrice tridimensionnelle pour ses propriétés d’injectabilité, de gélification en l’absence d’agent de réticulation toxique et son potentiel ostéoinducteur. Ce travail a consisté au développement de stratégies pour l’ingénierie tissulaire osseuse en associant le gel de GNF à une matrice naturelle de collagène cellularisée ou à des molécules bioactives pour promouvoir la régénération de lésions osseuses. Ces travaux ont permis de développer et caractériser des stratégies pertinentes pour la régénération de lésions osseuses basées sur l’utilisation d’hydrogels. / New strategies to overcome the clinical limitations of current techniques for bone defect filling and regeneration has led to the involvement of bone tissue engineering. Indeed, strategies based on tissue engineering techniques seem to be an alternative to the use of grafts and thus to defeat their limits. The approach employed in this thesis consists in development and use of hydrogels as scaffold materials for bone defect filling and regeneration. There are many approaches that also use hydrogels, each one with its advantages and limitations. In this context, our work consisted in the use of a non-polymeric hydrogel as basic material in the development of strategies for bone tissue engineering. Briefly, several cell types are present within bone tissue and will participate in the processes of bone formation and regeneration. The objective of our strategies was the contribution of exogenous stem cells and then their differentiation into osteogenic cells or the recruitment and differentiation of the host cells into osteogenic cells within the material. The GNF gel was used as a three-dimensional matrix considering its properties of injectability, gelation in the absence of toxic crosslinking agent and its osteoinductive potential. The goal was to develop strategies for bone tissue engineering by combining the GNF gel with a natural matrix of cellular collagen or bioactive molecules to promote the regeneration of bone lesions. This work allowed to develop and characterize strategies relevant to the regeneration of bone lesions based on the use of hydrogels.