Cette thèse porte sur l'étude numérique des écoulements fluide-particules rencontrés dans l'industrie. Ces travaux se situent dans le cadre de la compréhension des phénomènes qui se déroulent dans des tambours tournants et réacteurs à lit fixe en présence de particules de forme non convexe. En effet, la forme des particules influence de manière importante la dynamique de ces milieux. A cet effet, nous nous sommes servis de la plateforme numérique parallèle Grans3D pour la dynamique des milieux granulaires et PeliGRIFF pour les écoulements multiphasiques. Dans la première partie de cette thèse, nous avons développé une nouvelle stratégie numérique qui permet de prendre en compte des particules de forme arbitrairement non convexe dans le solveur Grains3D. Elle consiste à décomposer une forme non convexe en plusieurs formes convexes quelconques. Nous avons nommé cette méthode « glued-convex ». Le modèle a été validé avec succès sur des résultats théoriques et expérimentaux de tambours tournants en présence de particules en forme de croix. Nous avons aussi utilisé le modèle pour simuler le chargement de réacteurs à lits fixes puis des lois de corrélation sur les taux de vide ont été déduites de nos résultats numériques. Dans ces travaux, nous avons aussi testé les performances parallèles de nos outils sur des simulations numériques à grande échelle de divers systèmes de particules convexes. La deuxième partie de cette thèse a été consacrée à l'extension du solveur PeliGRIFF à pouvoir prendre en compte la présence de particules multilobées (non convexes) dans des écoulements monophasiques. Une approche du type Simulation Numérique Directe, basée sur les Multiplicateurs de Lagrange Distribués / Domaine Fictif (DLM/FD), a alors été adoptée pour résoudre l'écoulement autour des particules. Une série d'études de convergence spatiale a été faite basée sur diverses configurations et divers régimes. Enfin, ces outils ont été utilisés pour simuler des écoulements au travers de lits fixes de particules de forme multi-lobée dans le but d'étudier l'influence de la forme des particules sur l'hydrodynamique dans ces lits. Les résultats ont montré une consistance avec les résultats expérimentaux disponibles dans la littérature. / Non convex granular media are involved in many industrial processes as, e.g., particle calcination/drying in rotating drums or solid catalyst particles in chemical reactors. In the case of optimizing the shape of catalysts, the experimental discrimination of new shapes based on packing density and pressure drop proved to be difficult due to the limited control of size distribution and loading procedure. There is therefore a strong interest in developing numerical tools to predict the dynamics of granular media made of particles of arbitrary shape and to simulate the flow of a fluid (either liquid or gas) around these particles. Non-convex particles are even more challenging than convex particles due to the potential multiplicity of contact points between two solid bodies. In this work, we implement new numerical strategies in our home made high-fidelity parallel numerical tools: Grains3D for granular dynamics of solid particles and PeliGRIFF for reactive fluid/solid flows. The first part of this work consists in extending the modelling capabilities of Grains3D from convex to non-convex particles based on the decomposition of a non-convex shape into a set of convex particles. We validate our numerical model with existing analytical solutions and experimental data on a rotating drum filled with 2D cross particle shapes. We also use Grains3D to study the loading of semi-periodic small size reactors with trilobic and quadralobic particles. The second part of this work consists in extending the modelling capabilities of PeliGRIFF to handle poly-lobed (and hence non-convex) particles. Our Particle Resolved Simulation (PRS) method is based on a Distributed Lagrange Multiplier / Fictitious Domain (DLM/FD) formulation combined with a Finite Volume / Staggered Grid (FV/SG) discretization scheme. Due to the lack of analytical solutions and experimental data, we assess the accuracy of our PRS method by examining the space convergence of the computed solution in assorted flow configurations such as the flow through a periodic array of poly-lobed particles and the flow in a small size packed bed reactor. Our simulation results are overall consistent with previous experimental work.

L’importance de la problématique des vaches laitières non gestantes avec multiples inséminations (› 3) communément appelées « Repeat Breeder » (RB), au Québec, repose sur deux facteurs: son incidence et son impact économique. Actuellement, l’incidence du syndrome RB au Québec est de ± 25% (Rapport annuel, juin 2008, www.dsahr.ca). Les pertes monétaires associées à ce problème proviennent des frais vétérinaires et d’insémination, de la diminution de productivité ainsi que des pertes en lien avec la réforme involontaire. Afin d’avoir de meilleures connaissances sur ce syndrome, nous devons connaître les facteurs de risques généraux impliqués et ensuite explorer la condition individuelle de ces vaches problèmes. Dans la première partie de ce mémoire, une banque de données informatisées répertoriant 418 383 lactations fut analysée. L’objectif de ce projet de recherche était d’évaluer l’impact des problèmes reproducteurs post-partum et l’effet du nombre de lactations comme facteurs de risques de la vache Repeat Breeder. L’analyse a permis d’établir la dystocie comme étant la condition ayant le plus de conséquences sur la fertilité future. D’autres facteurs de risques à savoir le nombre de lactations influencent le pronostic reproducteur. La deuxième partie de ce mémoire consistait à explorer, à l’aide d’outils cliniques, la condition individuelle des vaches RB. Une étude cohorte fut menée sur des vaches Holstein en fin de période d’attente volontaire au jour 7 du cycle oestral. Les tests cliniques étudiés furent la vaginoscopie, l’examen transrectal, l’ultrasonographie du système reproducteur, la présence d’estérases leucocytaires, la bactériologie et la biochimie du liquide utérin, la cytologie endométriale et le profil de progestérone sérique. Les résultats de ces tests cliniques dévoilent que l’examen bactériologique du liquide utérin est révélateur du statut reproducteur futur. / Two factors underlie the Repeat Breeder (RB) concerns in Quebec: its incidence and economic impact. Currently RB incidence in Quebec is of ± 25% (yearly Report, June 2008, www.dsahr.ca). Monetary losses related to the RB are the result of veterinary expenses and insemination, loss of productivity and the involuntary culling. In order to have a better knowledge of this syndrome, one must understand the general risk factors involved and then explore the individual condition of these problem cows. The goal of the first part of the project was to assess the impact of the postpartum reproductive problems and the effect of the lactation number as risk factors of the Repeat Breeder cow. A computerized data bank listing 418 383 lactations was analyzed. The analysis established dystocia as being the condition with the most consequences on future fertility. Other risk factors namely the number of lactations influence the reproductive prognosis as well. The second part of the research was to explore the individual condition of the RB using clinical tools. A cohort study was conducted on Holstein cows at the end of the voluntary waiting period on day 7 of the oestrous cycle. The clinical tests studied were vaginoscopy, trans-rectal examination, ultrasonography of the reproductive system, presence of leukocyte esterase, bacteriology and biochemistry of uterine fluid, endometrial cytology and serum progesterone profile. The results of these clinical tests reveal that the bacteriological analysis of uterine fluid is indicative of future reproductive status.

The primary aim of the research has been to determine whether there is a relationship between personality variables as measured by the Occupational Personality Questionnaire (OPQ32i) and the work performance of credit controllers in a bank. Work performance was measured by means of internal company data sources. A literature review was used to verify whether there is a theoretical relationship between personality and work performance and strong evidence was found. The sample consisted of 89 credit controllers. The relationship between personality variables and work performance was determined by means of correlation studies and multiple regression analyses. Results are reported both in terms of statistical significance and effect sizes. Key terms: personality, work performance, credit control, personality trait theory, Sixteen Personality Factors questionnaire (16PF), Occupational Personality Questionnaire (OPQ). / Industrial and Organizational Psychology / M.Com. (Industrial Psychology)

In the last 20 years, various investigators have contributed valuable insights that shed light on the interconnected matrix of self-efficacy and attribution theories of motivation in instilling confidence and desire for academic achievement. However, these two areas of beliefs and their effects on students‟ achievement have rarely been researched together with writing performance here in Ethiopia. Both quantitative and qualitative methodologies have been integrated in the analysis of the data gathered from two secondary schools. The quantitative method was employed where participants were involved in taking composition test, filling out the self-efficacy scale and a questionnaire on attribution so as to investigate the relationships among the variables. The qualitative method was also used to examine the teachers‟ role in boosting students‟ motivation towards effecting goal-oriented striving at success in English writing performance The findings of this study indicated that there is a positive and strong relationship between writing self-efficacy beliefs and awareness and effective performance in writing tasks. It was also found that the learners who attributed their success to their ability and effort rather than to external causes achieved better results. Moreover, the findings of the qualitative data indicated that teachers‟ interest and motivation to teach writing can play a crucial role so as to raise the learners‟ feelings of self-worth and self-efficacy to do the writing activity. In other words, teachers need to capitalise on their learners‟ fervent desire for success and achievement in whatever line of endeavour, and the vital role effective writing skills play in the realisation of life goals. / English Studies / M.A. (Specialisation in TESOL)

The thesis deals with the content of selected phenolic compounds in some species of the genus Amaranthus, in black elderberry (Sambucus nigra L.) and buckwheat (Fagopyrum esculentum M.). Phenolic compounds are a group of natural compounds exclusively vegetable character. Flavonoids represent only one group of phenolic compounds. Flavonoids show many positive biological effects, in particular act as antioxidants. Natural flavonoids may cause to prevent from coronary- heard diseases and other diseases associated with older age. In recent years the increased attention is paid to flavonoid investigation due to its biological effects. For the determination of phenolic substances there were used two independent analytical methods. There are the high-performance liquid chromatography (HPLC) and micellar electrokinetic capillary chromatography (MECC). The MECC method was used for determination rutin and free quercetin. The highest content of rutin was found in leaves of buckwheat (76,400 mg/kg of dry weight) and the lowest content of rutin was determined in buckwheat hulls. The highest content of rutin was observed in teas from buckwheat leaves and inflorescence. This amount of rutin corresponds with rutin content in more than two pills of Ascorutin (the most favourite flavonoid medicament in the Czech Republic) The HPLC method was used for quantitative determination of phenolic acids. The content of free quercetin was monitored in all samples. No free quercetin was found both in plant material and in samples of teas. The ethanolic extract from the elderberry inflorescence didn´t contain any free quercetin. Free quercetin wasn?t found in any further samples of teas, which were prepared by described methods.

Made available in DSpace on 2015-05-14T12:36:43Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 3740448 bytes, checksum: df44ddc74f1029976a1e1beb1c698bf6 (MD5) Previous issue date: 2014-01-29 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / Nowadays, embedded systems have a huge amount of computational power and consequently, high complexity. It is quite usual to find different applications being executed in embedded systems. Embedded system design demands for method and tools that allow the simulation and verification in an efficient and practical way. This paper proposes the development and evaluation of a solution for embedded modeling and simulation of heterogeneous Models of Computation in a distributed way by the integration of Ptolemy II and the High Level Architecture (HLA), a middleware for distributed discrete event simulation, in order to create an environment with high-performance execution of large-scale heterogeneous models. Experimental results demonstrated that the use of a non distributed simulation for some situations as well as the use of distributed simulation with few machines, like one, two or three computers can be infeasible. It was also demonstrated the feasibility of the integration of both technologies and so the advantages in its usage in many different scenarios. This conclusion was possible because the experiments captured some data during the simulation: execution time, exchanged data and CPU usage. One of the experiments demonstrated that a speedup of factor 4 was acquired when a model with 4,000 thousands actors were distributed in 8 different machines inside an experiment that used up to 16 machines. Furthermore, experiments have also shown that the use of HLA presents great advantages in fact, although with certain limitations. / Atualmente, sistemas embarcados têm apresentado grande poder computacional e consequentemente, alta complexidade. É comum encontrar diferentes aplicações sendo executadas em sistemas embarcados. O projeto de sistemas embarcados demanda métodos e ferramentas que possibilitem a simulação e a verificação de um modo eficiente e prático. Este trabalho propõe o desenvolvimento e a avaliação de uma solução para a modelagem e simulação de sistemas embarcados heterogêneos de forma distribuída, através da integração do Ptolemy II com o High Level Architecture (HLA), em que o último é um middleware para simulação de eventos discretos distribuídos. O intuito dessa solução é criar um ambiente com alto desempenho que possibilite a execução em larga escala de modelos heterogêneos. Os resultados dos experimentos demonstraram que o uso da simulação não distribuída para algumas situações assim como o uso da simulação distribuída utilizando poucas máquinas, como, uma, duas ou três podem ser inviável. Demonstrou-se também a viabilidade da integração das duas tecnologias, além de vantagens no seu uso em diversos cenários de simulação, através da realização de diversos experimentos que capturavam dados como: tempo de execução, dados trocados na rede e uso da CPU. Em um dos experimentos realizados consegue-se obter o speedup de fator quatro quando o modelo com quatro mil atores foi distribuído em oito diferentes computadores, em um experimento que utilizava até 16 máquinas distintas. Além disso, os experimentos também demonstraram que o uso do HLA apresenta grandes vantagens, de fato, porém com certas limitações.

MPM / Oliver Tambo Institute of Governance and Policy Studies

Der alpine Skisport stellt in unserer Gesellschaft eine der beliebtesten Wintersportarten dar. Ausgehend von der Faszination der Berge in den vergangenen Jahrzehnten wurde die Sportart nahezu für jedermann zugänglich und entwickelte sich zu einem bedeutenden Wirtschaftsfaktor. Die Komplexität des alpinen Skisports ist für die Vielzahl der Personen jedoch nicht unproblematisch und beinhaltet Risiken, welche sich nicht selten als Ursache von Verletzungen darstellen. Das Zustandekommen der sportlichen Leistung ist dabei von mehreren Faktoren abhängig und je nach Leistungsniveau unterschiedlich gewichtet. Aus der Studienlage heraus wird ersichtlich, dass mehrere leistungsbestimmende Komponenten existieren, die sowohl konditionelle als auch koordinative Fähigkeiten als wichtige Voraussetzungen für die Ausführung der Skitechnik umfassen. Zudem wird deutlich, dass die Bedeutung der Gleichgewichtsfähigkeit im Konstrukt der Leistungsstruktur eine übergeordnete Rolle einnimmt. Nach Meinung verschiedener Autoren ist die Qualität skispezifischer Bewegungen daher auch in Abhängigkeit zur Gleichgewichtsfähigkeit zu sehen. Der Stellenwert dieser koordinativen Fähigkeit muss außerdem in Verbindung entstehender Verletzungen genannt werden, wodurch ihr als Faktor im sportmotorischen Anforderungsprofil eine vorrangige Stellung zuteil wird. Besonders im Breitensport, in dem der Leistungsgedanke in den Hintergrund rückt, scheint daher die Überlegung einer Risikoreduzierung oder Sturzvermeidung in Abhängigkeit des Materials sinnvoll zu sein. Speziell der Skischuh stand im Mittelpunkt der Betrachtungen dieser Studie, da er als Ausrüstungsgegenstand entscheidenden Einfluss auf die Übertragung von Steuerimpulsen nimmt. Das Bindeglied zwischen Mensch und Material bestimmt maßgeblich die Bewegungsregulation, die unter anderem von der Wahrnehmung außen einwirkender sensomotorischer Reize abhängig ist. Der Einfluss charakteristisch unterschiedlicher Schuhe auf die Gleichgewichtsfähigkeit wurde bislang jedoch noch nicht untersucht und stellt daher das Hauptanliegen dieser Arbeit dar. In Abhängigkeit der differenten Schuheigenschaft wurde außerdem die Fußsensibilität beim Tragen alpiner Skischuhe untersucht. Die in den insgesamt 3 Einzelstudien verwendeten Skischuhe unterschieden sich hauptsächlich in der Leistenbreite. Verwendet wurde ein sportlich orientierter Schuh (Breite 98mm) und ein komfortorientiertes Modell (Breite 103mm). Zur Quantifizierung der Gleichgewichtfähigkeit wurde ein spezifischer Prüfstand verwendet, der aus einer flexibel gelagerten Ebene bestand, auf der der Proband mittels alpiner Sicherheitsbindung arretiert wurde. Zur Simulation der skispezifischen Bewegung bestand die Aufgabe darin, so ruhig wie möglich zu stehen. Mittels Vibrationserzeugers wurde zur Messung der Fußsensibilität die Vibrationsreizschwelle plantar bestimmt. Zusammenfassend kann aus den Ergebnissen geschlussfolgert werden, dass sich ein in der Leistenbreite schmalerer und damit scheinbar fest sitzender Schuh positiv auf die Gleichgewichtsfähigkeit auswirkt. Beeinflusst durch die mit diesem Schuh festgestellte bessere Vibrationsreizwahrnehmung ist somit von einer besseren Bewegungsperformance auszugehen, durch die das Verletzungsrisiko reduziert werden könnte.

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Submitted by Marcia Bacha (marcia.bacha@fgv.br) on 2012-01-18T12:33:58Z No. of bitstreams: 1 1425452.pdf: 2852830 bytes, checksum: 85cdfb0a495d378dee6536c7ec163253 (MD5) / Approved for entry into archive by Marcia Bacha (marcia.bacha@fgv.br) on 2012-01-18T12:34:10Z (GMT) No. of bitstreams: 1 1425452.pdf: 2852830 bytes, checksum: 85cdfb0a495d378dee6536c7ec163253 (MD5) / Approved for entry into archive by Marcia Bacha (marcia.bacha@fgv.br) on 2012-01-18T12:34:33Z (GMT) No. of bitstreams: 1 1425452.pdf: 2852830 bytes, checksum: 85cdfb0a495d378dee6536c7ec163253 (MD5) / Made available in DSpace on 2012-01-18T12:34:40Z (GMT). No. of bitstreams: 1 1425452.pdf: 2852830 bytes, checksum: 85cdfb0a495d378dee6536c7ec163253 (MD5) Previous issue date: 2011 / Desde à muito, os temas, capital social e comportamento de cidadania organizacional (CCO) têm sido extensivamente pesquisado e estudados nos EUA, no entanto estes têm recebido pouca relevância a nível de outros contextos internacionais. Se por um lado, a sua importância e inferência na performance dentro do contexto empresarial têm sido crescente, caracterizando a necessidade de um entendimento cada vez maior por parte das empresas, por outro, o investimento das corporações de grande porte, caminham cada vez mais em direção dos países com crescimento exponencial sustentado, como são o BRIC, o que cna uma necessidade fomentada de pesquisa nesta área de pesquisa para estas regiões. Este estudo pretendeu investigar, avaliar e mapear a influência do capital e do CCO na satisfação de vida e desempenho no trabalho do funcionário de nível superior, no contexto empresarial brasileiro e português, com o objetivo de identificar quais as diferenças existentes nestes duas realidade, devido ao investimento crescente do segundo para com o primeiro. Genericamente, encontramos clara influência das dimensões do CCO tanto para o desempenho no trabalho como para a satisfação de vida do trabalhador, assim como presença também marcada das duas dimensões do capital Social. Mais especificamente, foi entendido pelo nosso estudo que a realidade empresarial brasileira necessita que as empresas criem mecanismos que fomentem os laços entre colegas, a conscienciosidade, altruísmo e virtude cívica dos seus funcionários, pois assim aumentará o desempenho. Já para o contexto português, apenas a conscienciosidade e a virtude apresentaram significativa relação. Desta forma, conclui-se que para o investimento das empresas português no Brasil, estas precisam ter atenção à dimensão estrutural - relação com colegas - promovendo-a e à necessidade patente que os brasileiros têm de ajudar os seus colegas - comportamento altruísta - para aumentar o desempenho no trabalho. No que se refere a satisfação de vida, que se mostrou estreitamente relacionada com o desempenho, o brasileiro apenas precisa notar confiança nos colegas, senti-se altruísta e consciencioso, ao passo que o português necessita criar fortes laços com os colegas, mas não fomentar o comportamento altruístico. Desta forma as empresas investidoras apenas precisam ter atenção mais uma vez a necessidade de prestar ajuda especifica que o brasileiro sente, promovendo workshops com os próprios funcionários, por forma a estes passarem o seu conhecimento, monitorias, estágios, entre outros. Estes resultados demonstraram que cada continente, país (possuidor ou não da mesma língua) e/ou cultura comporta diferenças significativas no contexto empresarial, assim tornase difícil implementar técnicas e comportamentos internacionais e esperar que os resultados sejam exatamente iguais. Este estudo espera dar alguns instrumentos de comparação para que as empresas portuguesas entendam, a este nível, a realidade brasileira. / Since long ago, the themes of social capital and organizational citizenship behavior (OCB) have been extensively researched and studied in the V.S., though these have received little attention in terms of other international contexts. On the one hand, its importance and inference performance within the business environment have been increasing, characterizing the need for an increased understanding by firms, on the other hand, investment by large corporations, walk increasingly direction of countries with sustained exponential growth, as BRIC countries, which creates a need for research in this area encouraged the search for these regions. This study intended to investigate, assess and map the influence of capital and of the CCO in life satisfaction and job performance of top-Ievel employee in Brazilian and Portuguese business environment, in order to identify differences between those two realities, because increasing investment from the second to the first. Generally, we find clear influence ofboth dimensions ofthe CCO to perform at work and for the life satisfaction of workers, and also marked presence of the two dimensions of social capital. More specifically, it was understood by our study that the Brazilian business reality requires companies to create mechanisms that foster ties between colleagues, conscientiousness, altruism and civic virtue of its officials, as well as increase performance. As for the Portuguese context, the only virtue and conscientiousness showed a significant relationship. Thus, we conclude that for investment firms Portuguese in Brazil, they need to pay attention to the structural dimension - relationship with colleagues - promoting it and need to clear the Brazilians have to help their colleagues - altruistic behavior - to increase job performance. Regarding life satisfaction, which was closely related to performance, Brazilians need only belive in colleagues trust, I was unselfish and conscientious, whereas the Portuguese need to create strong bonds with colleagues, but not to encourage altruistic behavior. Thus investment firms only need to pay attention once again the need to assist states that the Brazilian feel, providing workshops with the employees themselves, so they pass their knowledge, tutoring, internships, among others. These results demonstrated that each continent, country (with or not possessing the same language) and / or culture involves differences in a business context, so it is difficult to implement technical and intemational behavior and expect that the results are exactly alike. This study hopes to give some means of comparison to understand that Portuguese firms at this leveI, the Brazilian reality.