Submitted by Isaac Francisco de Souza Dias (isaac.souzadias@ufpe.br) on 2016-01-22T18:37:54Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Alex dissertacao biblio pdf.pdf: 1920115 bytes, checksum: 5d53197cee9577da1ce3e8cc35436431 (MD5) / Made available in DSpace on 2016-01-22T18:37:54Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Alex dissertacao biblio pdf.pdf: 1920115 bytes, checksum: 5d53197cee9577da1ce3e8cc35436431 (MD5) Previous issue date: 2015-04-15 / CAPES / A literatura de gestão de projetos apresenta fatores como críticos para o sucesso dos projetos. Este trabalho busca investigar e confirmar a importância desses fatores para que os projetos de Tecnologia da Informação (TI) sejam bem sucedidos, de modo a propor e construir um modelo de acompanhamento que possibilite auxiliar na gestão e no alcance do sucesso de projetos de TI, durante todo seu ciclo de vida. Para isso, foi aplicado um questionário semiestruturado, para submeter os fatores apresentados na literatura à avaliação dos gestores de projetos de TI da Região Metropolitana do Recife (RMR) e, dessa forma, com base nos julgamentos desses gestores, testar a significância desses fatores. A importância dos fatores foi testada através do teste estatístico de Wilcoxon. Verificou-se que, com base nos julgamentos dos gestores entrevistados, os fatores: atender o orçamento planejado, cumprir os prazos estabelecidos, atender às especificações feitas pelos clientes, atender às necessidades dos utilizadores, atingir a finalidade do projeto e atender à qualidade esperada do cliente apresentaram-se de forma significativamente importante para o alcance do sucesso do projeto de TI. Também foi verificada a significância dos fatores relacionados à gestão de projetos: não exceder o orçamento, respeitar os prazos estabelecidos, motivação da equipe em busca da qualidade especificada pelo cliente, produto entregue com a funcionalidade esperada, boa comunicação interna, gerenciamento de risco e promover um ambiente livre de conflitos. O modelo proposto não determina por si que projeto de TI terá êxito, uma vez que existem fatores externos não controláveis que podem inviabilizar o objetivo deste tipo de projeto. Dessa forma, o modelo construído se propõe a auxiliar a gestão de projetos de TI e assim aumentar as chances de alcance do sucesso dos mesmos. / The project management literature presents factors as critical to the success of projects. This paper seeks to investigate and confirm the importance of these factors for the success of Information Technology (IT) projects in order to propose and build a tracking model that enables assist in the management and in achieving the success of IT projects throughout the project life cycle. For this, a semi-structured questionnaire was administered to submit the factors presented in the literature to assess the management of IT projects in the Metropolitan Region of Recife (RMR) and thus, based on the judgments of these managers, test the significance of these factors. The importance of the factors was tested by the statistical Wilcoxon test. It was found that, based on the judgments of the managers interviewed, the factors: meet the planned budget, meeting these deadlines, meet the specifications made by customers, meet the needs of users, achieving the purpose of the project and meet the expected quality customer showed up significantly important way to achieve the success of the IT project. It was also verified the significance of factors related to project management: not exceed the budget, to respect the deadlines, team motivation in pursuit of quality specified by the customer, product delivered with the expected functionality, good internal communication, risk management and promote an environment free of conflicts. The proposed model does not determine for themselves the success of the IT project, since there are uncontrollable external factors that can hinder the success of this type of project. Thus, the model built proposes to assist the management of IT projects and thus increase the chances of achieving success thereof.

The machining of a new alloy often presents a challenge. While useful assumptions can be drawn from materials of similar properties, there will always be unpredictable outcomes. Titanium alloys have been employed in the aerospace industry due to their high mechanical properties and good strength-to-weight ratio. Ti-64 (Ti-6Al-4V) was the standard choice until recently, when Ti-555.3 (Ti-5Al-5V-5Mo-3Cr) began to take its place. Ti-555.3 has improved resistance to fatigue and higher mechanical properties compared to Ti-64 and is able to maintain its strength when exposed to high temperatures, which warrants its acceptance for many applications. However, its chemical reactivity, low thermal conductivity and high mechanical properties are known to cause challenges when cutting this alloy. Making use of both experimental procedures and computational resources, this work presents a comparison between these two aerospace alloys under different process conditions, setting the ground for further academic development and optimization strategies. Determining that these alloys are substantially different from a machinability standpoint (lower tool life, abrasion & chipping as dominant wear mechanisms and nonuniform chip formation for Ti555.3 versus Ti-64). Based on this further investigation should be carried out for optimal tooling selection to improve the machining of Ti555.3. / Thesis / Master of Applied Science (MASc)

Recent work has shown the capability of spherical nanoindentation to capture local structure-property relationships in polycrystalline cubic metals by measuring indentation stiffness and yield strength from stress-strain curves as a function of the local microstructure in the indentation zone. However, these protocols capture structure-property relationships at only one level of the material hierarchy (e.g., single grains). Thus it is still very difficult to infer bulk structure-property relationships using these indentation protocols, which is mainly due to a lack of understanding indentation length scale effects and the important role played by structural hierarchy (i.e., unique structural features at different length scales). It is the goal of this work to extend these protocols to systematically study length scale effects of mechanical properties (e.g., indentation stiffness and yield strength) in titanium alloys. Alpha-beta titanium alloys were chosen because they display a rich variety of two phase microstructures and structural hierarchy and are well documented in literature. Firstly, nanoindentation protocols are extended to characterize the elastic and plastic anisotropy of a hexagonally close packed metal (alpha titanium in commercially pure and alloy Ti-6Al-4V) and a two phase microstructure (alpha-beta colony in Ti-6Al-4V). Secondly, spherical microindentation stress-strain protocols are developed and employed to characterize polycrystalline volumes in three titanium alloys (commercially pure, Ti-6Al-4V, and Ti18). The results of these major advances in indentation protocols and systematic study of length scale effects on the mechanical properties in Ti-6Al-4V will be presented and discussed along with applications demonstrating their high throughput nature to rapidly explore alloy development.

No description available.

Afin d’enrayer le dérèglement climatique actuel dû à l’utilisation à grande échelle de combustibles fossiles comme source d’énergie, une transition vers des énergies non émettrices de dioxyde de carbone est nécessaire. L’hydrogène, vecteur d’énergie neutre en dioxyde de carbone, pourrait y jouer un rôle important. Cependant, ses propriétés thermodynamiques interdisent de le stocker pur à des pressions modérées dans un volume raisonnable pour alimenter un véhicule. Le stockage solide sous forme d’hydrure métallique semble être une solution prometteuse à ce problème. Les alliages de structure cubique centrée à base de vanadium étant légers comparés aux alliages à base de terres rares étudiés depuis les années 1970, cette thèse a pour objet l’étude des propriétés d’hydrogénation (pression d’équilibre et capacité d’absorption notamment) d’alliages du système Fe Ti–V. Les composés à étudier devant être de structure cubique centrée et la limite de solubilité du fer dans cette phase du système Fe–Ti–V n’étant pas documentée de manière fiable, la première partie du travail a consisté en l’approfondissement des connaissances sur le diagramme d’équilibre grâce notamment à la détermination des sections isothermes à 1000 °C et 1200 °C. Pour cela, des échantillons massifs ont été synthétisés par fusion en four à arc puis recuit en four résistif. Les relations de phases ont été systématiquement analysées par diffraction des rayons X sur poudre et microsonde électronique. Grâce à ces techniques, nous avons pu montrer qu’après recuit à 1000 °C, la limite de solubilité du fer dans un alliage Ti–V dépasse 15 at.% pour tout rapport Ti/V. Lorsque la température de recuit est portée à 1200 °C, cette limite de solubilité dépasse 20 at.% de fer quel que soit le rapport Ti/V < 1. Une réaction quasi-péritectique a également pu être mise en évidence à 1140 °C et une projection de la surface liquidus est proposée, basée sur l’analyse de la microstrucure des échantillons. La seconde partie de notre travail a consisté en l’étude sur banc manométrique des propriétés d’hydrogénation d’échantillons de structure cubique centrée. Il en ressort que la majorité des composés étudiés ont une capacité totale à température ambiante de 1,7H/M, soit 3,4 wt.%, ou 140 g_L-1, la capacité réversible s’élevant à 0,98H/M, soit 1,93 wt.%, ou 82,5 g_L-1 (densité supérieure à celle du dihydrogène liquide) pour l’échantillon de compositionTi10V88Fe2. La dépendance entre l’enthalpie d’hydrogénation et la compositiondes échantillons est linéaire et a été déterminée. On peut ainsi, en fonction de la composition choisie, obtenir des pressions d’équilibre allant de 0,1 bar à plus de 100 bar. Une étude structurale par diffraction des rayons X pour de faibles concentrations en hydrogène a mis en évidence la déformation de la maille cubique en maille quadratique lorsque la quantité d’hydrogène absorbé augmente. La cinétique d’absorption des échantillons de structure cubique centrée est par ailleurs très avantageuse, puisqu’une minute suffit pour que 90% de la capacité totale soit atteinte. En revanche, on observe un ralentissement de la cinétique en fonction du nombre de cycles appliqués. Toutefois, ce type d’alliage reste prometteur pour des applications de stockage de l’hydrogène / In order to stop the current climatic disturbance due to the large scale use of fossilfuels as a source of energy, a transition towards less carbon dioxide emitting energies is necessary. Hydrogen, a carbon dioxide neutral energy carrier, could play an important role. However, its thermodynamic properties prevent from storing it pure under moderate pressure in a reasonable volume in order to feed a vehicle. Metallic hydride storage seems to be a promising solution to this problem. Vanadium based body centered cubic alloys being light compared to rare earth based alloys used since the 1970s, the purpose of this work is the study of the hydrogenation properties (equilibrium pressure and absorption capacity in particular) of Fe–Ti–V system alloys.Since the compounds to be investigated have to take the body centered cubic structure, but the solubility limit of iron in this phase of the Fe–Ti–V system is not reliably documented, the first part of this work consisted in deepening the equilibrium diagram knowledge by determining the isothermal sections at 1000 °C and 1200 °C. With this aim in view, bulk samples were synthesized by arc melting followed by an annealing in a resistive furnace. The phase relations were systematically analysed by means of powder X-ray diffraction and electron probe microanalysis. Thanks to these techniques, we showed that after annealing at 1000 °C, the solubility limit of iron in a Ti–V alloy exceeds 15 at.% for any ratio Ti/V < 1. A quasi-peritectic reaction at 1140 °C could also be evidenced and a liquidus surface projection is proposed, based on microstructural analyses. The second part of this work consisted in the study of the hydrogenation properties of body centered cubic samples. The majority of the studied compounds showed a total capacity at ambient temperature of 1.7H/M, corresponding to 3.4 wt.%, or 140 g_L��1, and the reversible capacity of the sample of composition Ti10V88Fe2 amounts to 0.98H/M, corresponding to 1.93 wt.%, or 82,5 g_L��1 (density higher than that of liquid hydrogen). There is a linear relationship, which was determined, between the alloy compositions and the hydrogenation enthalpy. We can thus, depending on the chosen composition, obtain equilibrium pressures ranging from 0.1 bar to more than 100 bar. A structural study by meansof X-ray diffraction for low hydrogen concentrations pointed out the unit cell distortionfrom body centered cubic to body centered tetragonal by increasing hydrogen concentration. Furthermore, absorption kinetics of the body centered cubic samples is interesting, since 90% of the total capacity is absorbed within one minute. On the other hand, a slowing down of the kinetics is observed when a large number of hydriding – dehydriding cycles is applied. However, this kind of alloy remains promising for hydrogen storage applications

En la actualidad diversas empresas vienen aplicando outsourcing con la finalidad de enfocar sus recursos en su negocio principal, sin embargo, no en todas las organizaciones donde se viene aplicando esta práctica se ha logrado obtener buenos resultados. Esta investigación tiene como objetivo determinar la influencia del outsourcing en la gestión de Tecnología de Información (TI) de la Universidad Nacional Agraria de la Selva (UNAS) - Tingo María 2017. Tomando como punto de partida la problemática que existe en la Universidad a la cual se aplica el presente estudio, siendo el problema ¿Cómo influye el Outsourcing en la gestión de TI de la Universidad Nacional Agraria de la Selva - Tingo María 2017?, se plantea como hipótesis que el outsourcing mejora significativamente la gestión de TI en la Universidad Nacional Agraria de la Selva - Tingo María 2017. El tipo de investigación empleado en este trabajo es aplicado, el nivel explicativo y el diseño de investigación experimental.

Thesis (M. Soc. Sc.)--University of Hong Kong, 1992.

Diss. Phil. Naturwiss. Bern.

Thesis (M.Soc.Sc.)--University of Hong Kong, 1992. / Also available in print.

Made available in DSpace on 2018-08-02T00:03:47Z (GMT). No. of bitstreams: 1 tese_10364_gabriel - representac__807_a__771_o_de_capacidades_organizacionais_em_frameworks_de_defesa__uma_abordagem_baseada_em_ana__769_lise_ontolo__769_gica_2016.pdf: 1757297 bytes, checksum: e0e7865c191a2fc80dc61ec86c50e83d (MD5) Previous issue date: 2016-09-27 / De modo a modelar e estruturar os domínios organizacionais para o domínio de defesa e estabelecer relações entre esses domínios, vários frameworks de arquiteturas corporativas de TI vêm sendo desenvolvidos com tal proposito. Uma das noções contempladas por tais frameworks é a de capacidades organizacionais. Com a finalidade de investigar a conceituação e construtos de linguagem desses frameworks e verificar se existem possíveis lacunas na representação de capacidades organizacionais, neste trabalho nós realizamos uma análise ontológica em três frameworks para o domínio da defesa (DoDAF, MODAF e NAF). Em nossa análise, nós adotamos um sentido ontológico para capacidades organizacionais baseada na noção de disposições, em termos da ontologia de fundamentação UFO, como endurantes. Um aspecto chave desse sentido é que ele inclui tanto disposições universais quando individuais, de acordo com a ontologia de quatro categorias de Aristóteles. Nós mostramos como essa fundamentação que difere da fundamentação perdurantista subjacente aos três frameworks de defesa pode ser utilizada para clarificar deficiências identificadas nos frameworks para o suporte à capacidades organizacionais, tal como, definições e exemplos de uso de capacidades organizacionais nos frameworks divergem da fundamentação que os suportam (ontologia do IDEAS) e o suporte para representar, de fato, capacidades organizacionais (propriedades de indivíduos) não existe nos frameworks, e consequentemente, a representação das propriedades dessas capacidades torna-se infactível. Por fim, propomos uma revisão no meta-modelo das linguagens. Nessa revisão, principalmente, o conceito de capacidades organizacionais foi reificado, para de fato representar uma capacidade organizacional (uma propriedade de um indivíduo). E deste modo, foi possível resolver problemas de expressividade e permitir atividades, tal como medição de capacidades organizacionais, representação de melhorias em capacidades organizacionais ao longo do tempo e a reconfiguração de recursos enquanto se mantém ou melhora uma capacidade organizacional especifica.