L'utilisation croissante des Alliages à Mémoire de Forme (AMF) dans des structures de plus en plus complexes, notamment en vue d'applications médicales, rend nécessaire la compréhension des phénomènes régissant leur comportement et plus précisément la pseudo-élasticité. Le fort couplage thermomécanique, résultant de la transformation de phase martensitique, est un point clé de ce comportement. Les travaux de thèse présentés sont consacrés à l'étude et la modélisation de ce couplage. Tout d'abord, la transformation de phase martensitique provoque une déformation et une émission de chaleur couplées qui peuvent se localiser en bandes de transformation sous sollicitation uniaxiale. Une partie de cette thèse a été consacrée au développement de la Corrélation d'Images InfraRouge, qui permet à partir d'un unique film IR de mesurer conjointement, en une seule analyse, les champs cinématiques et thermiques discrétisés sur un même maillage éléments finis. Une application à l'analyse d'un essai de traction sur AMF de type NiTi a été réalisée. Le comportement pseudo-élastique a aussi été abordé d'un point de vue modélisation. Une large part de ce travail de thèse a donc été consacrée à l'élaboration d'un modèle multiéchelle et multiaxial, décrivant le comportement d'un VER à partir de la physique de la transformation martensitique à l'échelle de la maille cristalline. L'approche est inspirée de modèles multiéchelles développés pour la modélisation d'autres couplages multiphysiques et notamment magnéto-élastique. La troisième partie de cette thèse a été consacrée à l'élaboration d'un modèle de structure 1D sous traction uniaxiale. Dans un premier temps un modèle de thermique 1D ainsi qu'un modèle mécanique phénoménologique à seuils ont été développés. Les simulations rendent compte des phénomènes de transformation diffuse accompagnant l'élasticité puis de la transformation localisée. L'algorithme est notamment capable de gérer les deux sens de transformation. Ce modèle met en compétition les deux phénomènes transitoires de génération et évacuation de la chaleur par la transformation de phase et les échanges thermiques avec l'environnement. Ainsi, il est capable de reproduire la relation liant le nombre de bandes de transformation générées à la vitesse de sollicitation et aux conditions aux limites thermiques. Un travail été initié pour coupler ce modèle de structure et de gestion de la thermique au modèle monocristallin multiaxial. Sans encore reproduire la localisation de la transformation en bande, les simulations de traction montrent un hystérésis, issu des pertes thermiques dans l'air ambiant, bien que le modèle de comportement multiéchelle élémentaire soit écrit dans un cadre réversible, l'irréversibilité et la localisation étant avant tout des effets de transferts. Le couplage thermomécanique à la source des comportements si spécifiques des AMF que sont la super élasticité et la mémoire de forme ont donc été étudiés sous divers points de vue : expérimentalement, par l'établissement de modèles de comportement, par la simulation de structures 1D et des échanges thermiques mis en jeu. Les outils et modèles ont été appliqués à l'étude du Ni49,75at%Ti, support de ce travail, mais sont facilement adaptables à tout autre AMF. L'approche utilisée pour la modélisation multi-échelle peut être étendue à d'autres couplages, par exemple en cumulant les couplages thermo- et magnéto- mécaniques en vu de l'étude des Alliages à Mémoire de Forme Magnétiques par exemple.

The purpose of this study was to examine formal volunteering among retirees in order to explore whether their volunteer experiences represent an extension of their career in the paid workforce or whether their volunteer activities represent a completely new direction, and how this influences their career self-concept, as interpreted through Donald Super’s life-span, life-space theory of career development. This study employed a developmental mixed-method design. In Phase 1, qualitative interviews were conducted with 12 participants to better understand retirees’ volunteer experiences. Phase 1 informed the design of an instrument for the Phase 2 survey which examined the issues among a larger sample of 214 retirees. The Phase 2 results supported the Phase 1 findings and indicated that many retirees sought an extension of career in volunteer activities in that they used similar skills and knowledge. Study participants also displayed a desire for lifelong learning. Retirees relinquished their paid-work career, took on the retiree and volunteer roles, and integrated these roles within their career self-concept to create a new sense of self. These results indicated that the retirees had entered a new stage of life, qualitatively different from ‘retirement’. To better reflect the experiences of these retirees, it was proposed that Donald Super’s life-span, life-space theory of career development be extended to include Redirection. This theorizing is consistent with the finding that retirees both wanted to and are able to integrate previous paid work elements as well as seek out lifelong learning opportunities within their volunteer activities. This study demonstrates that the volunteer role in the lives of retirees can lead to personal renewal and reshaping of the career self-concept, or what is labeled as the stage of Redirection. This study also has implications for volunteer management, retirement planning and social policy, and may be of interest to volunteer managers, nonprofit organizations, career counsellors, financial planners, retirement planning consultants, life coaches and policy planners.

La mesure et la modélisation des concentrations en $^{36}$Cl accumulé au sein d'un plan de faille normal permet d'estimer l'âge et le glissement des forts séismes passés ayant successivement exhumé ce plan de faille. Si cette méthode présente l'avantage de fournir des enregistrements paléo-sismologiques continus sur des périodes de temps relativement longues (10 000 à 20 000 ans), la modélisation de données repose jusqu’à présent sur un modèle direct qui permet difficilement d'attester de l'unicité du scenario proposé, et d'estimer précisément les incertitudes associées, et ne tient pas compte de l'histoire long-terme du plan de faille, avant son exhumation post-glaciaire (héritage). Nous avons développé dans un premier temps un nouveau modèle qui inclut l’histoire d'héritage, et mis en place une procédure d'inversion des données permettant de 1) déterminer l'ensemble des paramètres de l'histoire sismique d'exhumation, 2) d’attester de l'unicité du scénario proposé, et 3) de contraindre précisément ses incertitudes. Nous appliquons notre méthode d’inversion à 11 failles des Apennins Centraux et montrons une grande variabilité dans leur activité sismique au cours des derniers 10 000 à 45 000 ans, avec des accélérations représentant 2 à 20 fois la vitesse long-terme de la faille. Nos résultats suggèrent en particulier que l'activité sismique des failles des Apennins Centraux pourrait être contrôlée par les propriétés intrinsèques des failles (vitesse long-terme, longueur, segmentation, état de maturité structurale), ainsi que par des processus d'interactions visco-élastiques agissant entre les failles. / The use of $^{36}$Cl cosmogenic nuclide as a paleo-seismological tool to determine the seismic history of normal faults provide continuous records over the past 10 000 to 20 000 yrs. The modeling of the $^{36}$Cl concentrations measured at the surface of an exhumed fault-plane allows determining the age and the displacement of the past seismic events that successively exhumed the fault-plane. The available modeling approach is however unable to attest for the unicity of the inferred scenario, which makes the estimate of the associated uncertainties difficult. An other limitation concerns the long-term history of the fault-plane prior its post-glacial exhumation (inheritance), that is not fully accounted for in this model (Schlagenhauf et al., 2010). We have developed a reappraisal of this model that accounts for the inheritance history, and includes a procedure of data inversion to 1) determine all parameters of the exhumation history at once, 2) attest for the unicity of the proposed scenario, and 3) precisely determine the associated uncertainties. Applying our new modeling to 11 normal faults previously studied in Central Apennines, we observe a large variability of their seismic activity over the last 10 000 - 45 000 yrs, with slip-rate acceleration reaching 2-20 times their long-term slip-rate. In particular, our results suggest that the seismic activity of normal faults in Central Apennines could be controlled by intrinsic properties of the faults (such as their long-term slip-rate, fault-length, segmentation, state of structural maturity), and by visco-elastic stress transfers between faults.

The purpose of the current research was to explore the narrative career experiences of Grade 12 learners as well as the constructs of the Life-Career Rainbow. Knowledge of how these constructs relate to one another added to the career literature as it relates to Grade 12 learners’ experiences of career guidance/development and served as a guide for the career guidance/counselling process. The main findings indicated that the past experiences of learners relating to subject choices highlighted that there is dissatisfaction with certain subjects not being included in the schools’ subject choices for Grades 10 to 12. At this phase, learners were found to be uncertain about their future plans. The learners’ present experiences in career crystallising indicated that they are in the process of exploring and crystallising their career choices. In terms of future employment options, learners indicated interests that fitted within most career types while other learners were undecided about their future aspirations. The career types included sports, entertainment, financial, the military and medicine/nursing. The findings demonstrate consistency with previous national research on adolescents’ occupational aspirations. Influences which were found to be prominent were personality, interests and abilities, parents, friends, teachers, schooling experiences, financial support, availability of jobs, work experience, and opportunities to work overseas. / Psychology / M.A. (Psychology)

CAVALCANTE, João Paulo Braga. Conexões entre o mundo on-line e a vida off-line: otakus e cultura de consumo na era da internet. 2008. 153 f. Dissertação (Mestrado em Sociologia) – Universidade Federal do Ceará, Departamento de Ciências Sociais, Programa de Pós-Graduação em Sociologia, Fortaleza-CE, 2008. / Submitted by nazareno mesquita (nazagon36@yahoo.com.br) on 2011-12-04T10:44:21Z No. of bitstreams: 1 2008_Dis_JPBC.pdf: 2437164 bytes, checksum: adff224e9a31571c037b2a2d6e2ec36c (MD5) / Approved for entry into archive by Maria Josineide Góis(josineide@ufc.br) on 2011-12-29T12:30:19Z (GMT) No. of bitstreams: 1 2008_Dis_JPBC.pdf: 2437164 bytes, checksum: adff224e9a31571c037b2a2d6e2ec36c (MD5) / Made available in DSpace on 2011-12-29T12:30:19Z (GMT). No. of bitstreams: 1 2008_Dis_JPBC.pdf: 2437164 bytes, checksum: adff224e9a31571c037b2a2d6e2ec36c (MD5) Previous issue date: 2008 / This research aimed to analyze the subjects related to social changes in the contemporary consumption culture due to interaction between social players and new electronic medias according to World Wide Web This interaction comes from the social player’s growing autonomy against the authorized issuer of product and information I’ve founded that consumer networks structured by subcultures have created unauthorized channels of sharing of messages circumventing the law This phenomenon was observed in a consumption subculture known as otaku whose origin is Japanese This term means an enthusiast of Japanese animes mangas cartoon and comics The otakism is a movement intrinsic to culture globalization and it looks at a powerful connection between new digital technologies and post-1980s youth that is more individualistic and more independent of authorized medias The growth of otakism could be observed in Fortaleza a city that hosts every year one of the biggest anime convention in Brazil called Super Amostra Nacional de Animes (SANA) Its numbers of visitors grows years after years The qualitative and quantitative methods of analyze were used in this research including exploratory poll in SANA event non-structured interviews and ethnography in virtual ambients The last one was designed to understand the quality of social relations in the multidirectional new medias where all players are issuers receptors and creators at the same time The research discovered that otaku subculture has been adapting the new digital technologies particularly the Internet for its consumption purposes and expansion of the possibilities of interpersonal relationships / Esta pesquisa teve como meta analisar questões relacionadas a mudanças na cultura de consumo contemporânea decorrentes da interação entre agentes sociais e novas mídias eletrônicas nos moldes da World Wide Web Tal interação resultou na crescente autonomia do agente perante os emissores oficiais de produtos e informação Constatou-se que redes de consumidores organizadas em subculturas têm criado canais não oficiais de compartilhamento de mensagens burlando barreiras legais e territoriais Este fenômeno foi observado na subcultura de consumo conhecida como otaku de origem japonesa O termo designa indivíduos aficionados em animes e mangás animações e quadrinhos japoneses respectivamente O otakismo é um movimento inerente a globalização cultural e retrata uma forte ligação das novas tecnologias digitais com uma juventude pós-década de 1980 mais individualista e mais independe dos meios de comunicações oficiais O crescimento do otakismo pôde ser observado na cidade de Fortaleza onde ocorre todos os anos uma das maiores convenções de animes do Brasil a Super Amostra Nacional de Animes (SANA) com um número cada vez maior de freqüentadores Os métodos de análise foram qualitativos e quantitativos com enquete exploratória na ocasião da SANA entrevistas não-estruturadas e etnografia em ambientes virtuais direcionada para a descoberta da natureza das relações sociais nestas novas mídias multidirecionais (todos os envolvidos são emissores receptores e produtores ao mesmo tempo) Concluiu-se que a subcultura otaku vem adaptando as novas tecnologias digitais particularmente a Internet para seus propósitos de consumo e para a ampliação das possibilidades de relacionamento interpessoal

This work covering the period 1795 to 1948 has four main features. It firstly examines the role of international and domestic factors in determining regional interaction and cooperation between South Africa and Chile. Secondly, it documents the whims of the international community, and more particularly the world powers which was a motivating factor in Chilean and South African politics, economy, society and their bilateral relations. Thirdly it covers the period when Britain rose to world power status. Eventually, this gave way to her displacement by Germany and then ultimately the United States. This study's fourth feature is that it marks the first documented account of direct contact between the inhabitants at the Cape of Good Hope and Latin America. The period ends with a cornerstone in the history of South African-Chilean bilateral relations when direct diplomatic and consular relations were established by both South Africa and Chile in May 1948. / M.A. (History)

Made available in DSpace on 2014-12-17T15:15:02Z (GMT). No. of bitstreams: 1 FabioFM.pdf: 1459636 bytes, checksum: 4f2bb557c6a5bddb80e46f325bd5b4dd (MD5) Previous issue date: 2004-12-03 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / In this work we study the spectrum (bulk and surface modes) of exciton-polaritons in infinite and semi-infinite binary superlattices (such as, ???ABABA???), where the semiconductor medium (A), whose dielectric function depends on the frequency and the wavevector, alternating with a standard dielectric medium B. Here the medium A will be modeled by a nitride III-V semiconductor whose main characteristic is a wide-direct energy gap Eg. In particular, we consider the numerical values of gallium nitride (GaN) with a crystal structure wurtzite type. The transfer-matrix formalism is used to find the exciton-polariton dispersion relation. The results are obtained for both s (TE mode: transverse electric) and p (TM mode: transverse magnetic) polarizations, using three diferent kind of additional boundary conditions (ABC1, 2 e 3) besides the standard Maxwell's boundary conditions. Moreover, we investigate the behavior of the exciton-polariton modes for diferent ratios of the thickness of the two alternating materials forming the superlattice. The spectrums shows a confinement of the exciton-polariton modes due to the geometry of the superlattice. The method of Attenuated Total Reflection (ATR) and Raman scattering are the most adequate for probing this excitations / Neste trabalho estudamos o espectro (modos de volume e de superf?cie) dos polaritons de exciton em uma super-rede bin?ria infinita e semi-infinita (tal como, ???ABABA???), onde um meio semicondutor (A), cuja fun??o diel?trica depende da frequ?ncia e do vetor de onda, alterna-se com um diel?trico comum (B). Aqui, o meio A ser? modelado por um semicondutor da fam?lia dos nitretos (semicondutor III-V) que tem como caracter?stica principal um gap de energia (Eg) direto e largo. Em particular, consideramos os valores num?ricos para o nitreto de g?lio (GaN) com uma estrutura cristalina tipo wurtzite. A t?cnica da matriz de transfer?ncia ? utilizada para encontrarmos a rela??o de dispers?o do polariton de exciton. Os resultados s?o obtidos para os modos de polariza??o s (ou modo TE: transversal el?trico) e p (ou modo TM: transversal magn?tico), usando tr?s diferentes condi??es de contorno adicionais (ABC1, 2 e 3), mais as condi??es de contorno padr?es de Maxwell. Al?m disso, investigamos o comportamento dos modos do polariton de exciton para diferentes raz?es entre as espessuras das camadas dos dois materiais que comp?em a super-rede Os espectros encontrados evidenciam um comportamento de confinamento dos polaritons de exciton devido ?s geometrias empregadas. As t?cnicas experimentais ATR ("Attenuated Total Reflection") e o espalhamento Raman s?o as mais adequadas para a caracteriza??o dessas excita??es

No description available.

nÃo hà / Nesta dissertaÃÃo objetiva-se analisar a realizaÃÃo humana segundo a perspectiva do filÃsofo Friedrich Nietzsche (1844-1900). Considera-se, para tanto, o processo vital circunscrito pelo subtÃtulo dado à autobiografia: âcomo alguÃm se torna o que Ãâ. Privilegiando os temas tratados em Ecce Homo, intermedeiam-se as discussÃes com o cotejamento daqueles assuntos abordados por outras obras do FilÃsofo. Tornar-se o que se à constitui nÃo apenas um cume perseguido, mas igualmente uma sobredeterminaÃÃo inapelÃvel para a filosofia de Nietzsche. Nesse caminho, ele valorizou, contra a tradiÃÃo filosÃfica e religiosa, o cultivo de si e o amor de si como propiciadores do grande e fecundo egoÃsmo. Apontou para a superaÃÃo de tudo aquilo que amesquinha e enfraquece o homem, elogiando o que fortalece e plenifica a vida compreendida por ele como vontade de poder em expansÃo. O cultivo da grande individualidade surge como contraposiÃÃo, nessa filosofia, à massificaÃÃo do homem pelas forÃas gregÃrias que arrebanham os âseres supÃrfluosâ em igrejas, povos e estados. Percorrem-se, entÃo, as ponderaÃÃes de Nietzsche sobre o que ele nomeou de âcasuÃstica do egoÃsmoâ, sua pretensa extemporaneidade, bem como se delimita aquilo designado pelo FilÃsofo como die Wohlgeratenheit, âa vida que vingouâ. SÃo trabalhadas, a seguir, as relaÃÃes dessa vida bem lograda com as teses de Nietzsche sobre a razÃo, a subjetividade, o cultivo de si mediante a disciplina do guerreiro â ele prÃprio entendia-se como um filÃsofo guerreiro. Por fim, apresenta-se sua compreensÃo acerca do que à a mÃxima auto-realizaÃÃo depois que o Ãltimo homem se configurou no niilismo caracterÃstico da contemporaneidade: a figura de Zaratustra como super-homem, mestre do eterno retorno e amante do destino.

Neste trabalho apresentamos um estudo das reações de spallation a energias interme- diárias em núcleos actinídeos e pré-actinídeos. Para esta finalidade foi utilizado o modelo de Monte Carlo CRISP (Colaboração Rio-São Paulo), que neste estudo foi importante na reprodução da distribuição de massa de produtos residuais e as seções de choque de fissão e espalação. Estes observáveis são importantes para o estudo de Reatores Hibridos ADS considerado como dispositivos promissores para a transmutação de resíduos nucle- ares. Os modelos físicos necessários para uma correta simulação de dados experimentais foram já implementadas no CRISP, como o modelo de evaporação para emissão de par- tículas descrito por Weisskopf de 1937, e para fissão o clássico modelo de Bohr/Wheeler de 1939. Para a obtenção da distribuição dos fragmentos de massa de fissão o CRISP conta também com um modelo baseado na parametrização multimodal de fissão, que si- mula os processos de fissão simétrica e assimétrica predominantes em altas e baixas ener- gias, respectivamente. Os resultados obtidos do CRISP depois da aplicação dos modelos mencionados, foram os rendimentos de massa dos fragmentos residuais, os quais foram analisadas para o cálculo da seção de choque de fissão e espalação mediante uma fórmula implementada no modelo. Com o resultado se fez o gráfico da distribuição de massa para cada uma das reações analisadas. Uma das reações estudadas foi a reação induzida por fótons de Bremsstrahlung com energias máximas de 50 e 3500 MeV em um alvo de 181 Ta, calculando a distribuição de massa de fissão e espalação, mostrando bons resultados de acordo com os dados experimentais. Nas reações induzidas por prótons foram calcula- das as seções de choque de fissão e espalação assim como sua respectiva distribuição de massa dos produtos residuais. Neste caso estudamos duas reações, sendo: a reação p (1 GeV) + 208 Pb, e a reação de p (660 MeV) + 238 U. Para a primeira reação com chumbo os resultados do CRISP foram comparados com dados experimentais, e também com os resultados obtidos do modelo MCNPX-Bertini do trabalho de Baylac-Domengetroy de 2003, que simulou a mesma reação com chumbo. Obtendo-se melhores resultados com o CRISP mas com uma superestimação de dados no final da distribuição calculada. No caso do urânio, foi necessário usar a chamada fissão superassimétrica porque a distribuição de massa experimental é mais complexa e o modelo multimodal clássico não é suficiente para sua correta simulação. Foi também estudado as reações induzidas por dêuterons usando o modelo CRISP, mostrando os resultados da distribuição de massa para 197 Au e 208 Pb com algumas limitações do modelo para este tipo de reações. / In this work we present a study of the spallation reactions by intermediate energies in actinide and pre-actinide nuclei. For this purpose we used the Monte Carlo model CRISP (Rio-São Paulo Collaboration), for our study was important in the reproduction of the mass distribution of waste products and the total fission and spallation cross secti- ons. These observables are important for the study of Accelerator Driven System Reac- tors (ADS) considered as promising devices for the transmutation of nuclear waste. The physical models needed for a correct simulation of experimental data were already imple- mented in CRISP, such as the evaporation model for emission of particles described by Weisskopf in 1937, and the classical Bohr/Wheeler model in 1939, for fission. To obtain the fragment mass distribution for fission, CRISP has a model based on multimodal fis- sion parameter, which simulates the processes called symmetric and asymmetric fission that are predominant at high and low energies respectively. The CRISP results, obtai- ned after the application of the above mentioned models, were the mass yield of residual fragments, which were analyzed to calculate the fission and spallation cross section using a formula that was implemented in the CRISP model. With these result was obtained the mass distribution for each reaction analyzed. One of the reactions studied was a re- action induced by Bremsstrahlung photons with endpoint energies of 50 MeV and 3500 in a target 181 Ta, calculating the fission and spallation mass distribution, showing good results according the experimental data. In the reactions induced by protons were cal- culated fission and spallation cross sections as well as their respective mass distribution of the residual products. In this case we study two reactions, as follows: p (1 GeV) + 208 , and p (660 MeV) + 238 U. For the first reaction with lead, the results of CRISP were compared with experimental data and with results obtained of MCNPX-Bertini model of Baylac-Domengetroy work in 2003, simulated the same reaction with lead. Obtaining better results with CRISP, but with data-overestimated at the end of calculated distribu- tion. For uranium it was necessary to use the called superasymmetric fission, because the experimental mass distribution is more complicated and the classical model is not suffi- cient for a correct simulation. Has been also studied the reactions induced by deuterons using the CRISP model, showing the mass distribution