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Methods for Reducing the Complexity of Geometrical Structures Based on CFD Programming : Time Efficient Simulations Based on Volume Forces Coupled with Single and Two-phase FlowRezk, Kamal January 2014 (has links)
Throughout recent years, computer based programs have been applied to solve and analyse industrial problems encountered global fields such as automobile design for reduction of CO2-gas, designing wind parks aimed at increasing power output etc. One of these developed programs is Computational Fluid Dynamics (CFD) which numerically solves complex flow behaviour based on computer power. As there is an ongoing expansion of CFD usage in industry, certain issues need to be addressed as they are becoming more frequently encountered. The general demand for the simulation of larger control volumes and more advanced flow processes result in an extensive requirement of computer resources. Moreover, the implementation of commercial CFD codes in small-scaled industrial companies seems to generally be utilised as a black box based on the knowledge of fluid mechanic theory. Increased partnerships between industry and the academic world involving various CFD based design processes generally yield to a verbal communication interface, which is a crucial step in the process given the level of dependency between both sides. Based on these notions, a method for establishing time efficient CFD-models with implementation of volume forces as sink terms in the momentum equation is presented. The internal structure, or parts of the structure, in the simulation domain is removed which reduces the geometrical complexity and along with it, computational demand. These models are the basis of assessing the benefits of utilizing a numerical based design process in industry in which the CFD code is used as a communication tool for knowledge sharing with counterparts in different fields. / As there is an ongoing expansion of CFD usage in industry, certain issues need to be addressed as they are becoming more frequently encountered. The general demand for the simulation of larger control volumes and more advanced flow processes result in an extensive requirement of computer resources. Moreover, the implementation of commercial CFD codes in small-scaled industrial companies seems to generally be utilised as a black box based on the knowledge of fluid mechanic theory. Increased partnerships between industry and the academic world involving various CFD based design processes generally yield to a verbal communication interface, which is a crucial step in the process given the level of dependency between both sides. Based on these notions, a method for establishing time efficient CFD-models with implementation of volume forces as sink terms in the momentum equation is presented. The internal structure, or parts of the structure, in the simulation domain is removed which reduces the geometrical complexity and along with it, computational demand. These models are the basis of assessing the benefits of utilizing a numerical based design process in industry in which the CFD code is used as a communication tool for knowledge sharing with counterparts in different fields.
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[en] THE WILL TO POWER AND THE WORLD AS A NETWORK OF FORCES / [pt] A VONTADE DE PODER E O MUNDO COMO REDE DE FORÇASDIOGO BARROS BOGEA 11 June 2012 (has links)
[pt] Formulação de uma ferramenta teórica de descrição e explicação dos processos que constituem o mundo, com base no conceito nietzschiano de vontade de poder e em sua teoria das forças, segundo a qual tudo o que há são forças intrinsecamente impulsionadas pela vontade de poder. Todo e qualquer dado físico ou mental é concebido como expressão de forças pulsionais que, em seu movimento de acumulação e expansão de poder, atuam umas sobre as outras, estabelecem relações de poder entre si, aniquilam-se, dominam-se, escravizam-se, associam-se temporariamente, entrelaçam-se em rede e produzem, como efeito, configurações de forças de todos os tipos – células, tecidos, pessoas, coisas, instituições, ideias, etc. / [en] Formulation of a descriptive and explanatory theoretical tool to the processes that constitute the world, based on the Nietzschean concept of will to power and his theory of forces, according to which everything that exists are forces intrinsically driven by the will to power. Any given physical or mental data is conceived as an expression of instinctual forces that in its movement of accumulation and expansion of power, act on each other, establish relations of power between themselves, annihilate, dominate, enslave, get temporarily associated, intertwine in a network and produce, as effect, configurations of forces of all kinds – cells, tissues, people, things, institutions, ideas, etc.
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Militarizing politics or politicizing the military? Interactions between politicians and the military in Zimbabwe, 2000-2013Mahuku, Darlington Ngoni January 2017 (has links)
A dissertation submitted to the Faculty of Humanities, University of the Witwatersrand, Johannesburg, for the degree of Doctor of Philosophy, 2017 / The thesis analyses civil-military relations in Zimbabwe since independence, but especially during the period from 2000 through 2013. A central question is why an outright military coup has not occurred, despite severe political and economic crises. Thequestion is broken down into two linked sub- -military relations question of why the military have not seized power from civilians and (2) the question why no "populist military revolt" has occurred, despite the kind of hyperinflation that has triggered such revolts in countries like Ghana and Ethiopia: [Abbreviated Abstract. Open document to view full version] / XL2018
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Armed forces as instruments of foreign policy: some case studiesCampbell, R. K.(R. Keith) 13 January 2015 (has links)
No description available.
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The social integration of demobilised ex-combatants in Mozambique.Taju, Gulamo Amade January 1998 (has links)
A dissertation submitted to the Faculty of Arts, University of the Witwatersrand,
Johannesburg. in partial fulfilment of the requirements for the degree of Master of
Arts / This study is an analysis of the social integration of demobilised soldiers in
Mozambique, in the context of post-war social reconstruction. De-constructing the
concept of "reintegration" that informed the top-down programmes designed for the
social integration of ex-combatants, that dichotomize society into the military sphere
and the civilian one, so that the process into which ex-combatants are involved after
leaving the Army is one of "returning home", as society remaining the same or in a
moving equilibrium, one saw society- marked by social differentiations, even
amongst the demobilised ex-combatants. The ideal of "sameness" between "civilians"
and ex-combatants involved in the concept of reintegration seems more an utopia.
This research used previous studies of my colleagues. In criticizing them, I do not
wish to create the impression that these works are of little value. Their analysis stand
from very different disciplinary approaches, and with others aims. The major
weakness I often saw was the indefinition of the terms they use and the mix of
concepts like social integration and reintegration as having the same meaning. Other
documentary research was carried out, and as the study included the understanding
of meanings, values, individual actions and social interactions, in order to capture
the meaningfulness of such life other qualitative methods were employed as the
informal interviews, the use of key informants, participation in and observation of
events in the setting.
Looking society in a dynamic change, social integration is regarded as the process of
negotiation of a common social order between actors in interaction (demobilised
soldiers, other social groupings, and institutions like the state). It is better approached
using the concept of integration. As an interactive process it is marked by a tension
between the affirmation of the individuality of actors and the will to the sense of
community. In its course different actors mobilise and use different identities
according to the situations. avoiding or erasing specificities of previous socializations
and identities and highlighting others.
This study is an analysis of the social integration of demobilised soldiers in
Mozambique, in the context of post-war social reconstruction. De-constructing the
concept of "reintegration" that informed the top-down programmes designed for the
social integration of ex-combatants, that dichotomize society into the military sphere
and the civil one, so that the process into which ex-combatants is one of "returning
home", as society remaining the same or in a moving equilibrium, one saw society
full of differentiations, even within the groups social defined as "demobilised
soldiers". The ideal of "sameness" involved in the concept of reintegration seems
more an utopia. Society is full of social differentiation, and the group of demobiIised
soldiers also inmarked by differences of gender, age, marital status, previous military
affiliation and rank, control of resources and social status in the living/working place,
marital status.
This study used previous studies of my colleagues. In criticizing them, I do not wish
to create the impression that these works are of little value. Their analysis stand from
very different disciplinary approaches, and with others aims. The major weakness I
often saw was the indefinition of the terms they use and the mix of concepts like
social integration and reintegration as having the same meaning. Other documentary
research was carried out, and as the study included the understanding of meanings,
values, individual actions and social interactions, to capture the meaningfulness of
such life other qualitative methods were employed: informal interviews, the use of key
informants, participation in and observation of events in the setting.
Looking society in a dynamic change, the process of negotiation of a social order
between actors in interaction (demobilised soldiers, other social groupings, and
institutions like the state) is better approached using the concept of social integration.
As an interactive process, in its course different actors mobilise and use different
identities, the most convenient for each occasion, in a way that sometimes involves
the attempt to erase specificities of previous socializations and identities. / Andrew Chakane 2019
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I allmänhetens tjänst? : en fallstudie över intressekonflikter mellan kommuners fysiska planering och riksintressen för totalförsvarets militära del.Sundberg Wallman, Max January 2019 (has links)
Abstract The aim of this study is to gain a deeper understanding of the conflicts of interests that may arise between the differing land use needs of a municipal planning agency and The Swedish Armed Forces. The study is based on three distinct cases located in the municipalities of Umeå, Luleå and the region of Gotland; each respective case presents unique contextual factors at the local level and these also serves to exemplify the issue at a national level. The work has been carried out as a case study and the methods employed were research interviews, document-based research and literature studies. The results indicate that there are significant differences in the planning practice used by the respective municipal planning agencies and that employed by The Swedish Armed Forces in terms of differing aims, methods and outcomes. The study also highlighted how the outcome of each case was dependent upon a combination of contextual factors and the impact of external factors such as national politics, changing security policy, urban development and progression of the environmental legislation. In short, The Swedish Armed Forces is a land use agency that has had significant impact on the municipal planning in each of the locations that has been studied. In a Swedish context, their land use needs are classified as being of national interest and thusly have precedence over competing land use claims. These factors have combined to create conditions in which municipal planning is, to some extent, often restricted by the land use needs of The Swedish Armed Forces.
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Visualization tool for molecular dynamics simulationUnknown Date (has links)
A study of Molecular Dynamics using computational methods and modeling provides the understanding on the interaction of the atoms, properties, structure, and motion and model phenomenon. There are numerous commercial tools available for simulation, analysis and visualization. However any particular tool does not provide all the functionalities. The main objective of this work is the development of the visualization tool customized for our research needs to view the three dimensional orientation of the atom, process the simulation results offline, able to handle large volume of data, ability to display complete frame, atomic trails, and runtime response to the researchers' query with low processing time. This thesis forms the basis for the development of such an in-house tool for analysis and display of simulation results based on Open GL and MFC. Advantages, limitations, capabilities and future aspects are also discussed. The result is the system capable of processing large amount of simulation result data in 11 minutes and query response and display in less than 1 second. / by Meha Garg. / Thesis (M.S.C.S.)--Florida Atlantic University, 2010. / Includes bibliography. / Electronic reproduction. Boca Raton, Fla., 2010. Mode of access: World Wide Web.
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Climate Change & (In)Security : Practical Implications of SecuritizationSöder, Rickard January 2019 (has links)
This study explores different perceptions of security and investigates if recognition of climate change as a security issue has implications for countries’ armed forces. I use a securitization framework to understand how discursive positions are created, and by making the framework more dynamic I investigate how similar security matters are represented in different ways. I argue that securitization of climate change in national contexts changes the armed forces’ strategies to bring about security and that their activities are affected by the underlying logics of the discursive arguments. To investigate the proposed relation, I conduct a comparative case study of Norway and Sweden, and find that different ideas about the security dimension of climate change have different implications for the armed forces’ practices and organization.
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Desenvolvimento de controladores de forças generalizadas em manipuladores industriais / Development of generalized force controller for industrial robotsMirandola, André Luís de Aguiar 22 September 2006 (has links)
Esta dissertação estuda a otimização da capacidade de interação de manipuladores robôs com o meio externo através do controle das forças e torques envolvidas no contato. Os modelos adotados para as análises levam em consideração a interação entre a extremidade do manipulador e uma superfície. Neste trabalho, são investigadas diferentes metodologias para controle de forças, assim como as vantagens e desvantagens de cada método estudado para comparar e desenvolver um controle adequado das forças de contato. Devido às divergências encontradas na literatura, foram implementadas experimentalmente duas abordagens distintas conhecidas por controle cinestático e controle híbrido. Também, como parte do ambiente experimental, foi desenvolvido um protótipo de um micro manipulador com um grau de liberdade instalado na extremidade do robô. O micro manipulador simplifica a implementação de controle de força ativo, pois trabalha de forma independente do acionamento \"fechado\" dos robôs industriais abordados no trabalho. Assim é possível manter uma força arbitraria desejada no contato com a superfície. O controlador de força se sobrepõe ao controlador de posições convencional do manipulador para produzir o comportamento desejado na interação com o meio externo. / The optimization of a conventional industrial robot manipulator capacity to interact with the surrounding environment is analyzed in this work. The models adopted for the analysis take into account the contact between the robot and an external surface. Different force control approaches are analyzed regarding their implementation advantages and disadvantages. Due to the well known contradictions in the literature experiments were carried out using the kinestatic control and the hybrid control. A micro manipulator with one degree of freedom was developed and installed at the end effector in association with the tool tester. With this system it is possible change the contact force on the surface. The simultaneous coordinate work of the robot position control and the micro manipulator system force control are use to produce a desired behavior in the interaction with the external surface.
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Amazônia: pensamento e presença militar / Amazon: thought and military presenceMarques, Adriana Aparecida 03 September 2007 (has links)
A tese analisa o pensamento dos militares sobre a Amazônia brasileira e a escolha das estratégias das Forças Armadas para defender a região, dando uma especial atenção às modalidades de sua presença na área. A pesquisa mostra que a identificação da Amazônia como prioridade estratégica das Forças Armadas não se deve apenas a uma reconfiguração dos interesses estatais em matéria de segurança e defesa. A importância atribuída à região amazônica pelos militares resulta de uma intrincada relação entre interesses e elementos simbólicos. O primeiro capítulo apresenta o debate acadêmico entre neorealistas, organizativistas e construtivistas sobre o que determina a adoção de uma doutrina militar por um Estado. O segundo capítulo analisa o discurso dos militares sobre a região amazônica e as transformações deste discurso ao longo das duas últimas décadas, dando especial atenção ao discurso do Exército. O terceiro capítulo examina a presença do Exército na Amazônia e as estratégias militares elaboradas para defendê-la. O quarto capítulo trata das percepções da Força Aérea e da Marinha sobre os problemas de Defesa Nacional na Amazônia. E o quinto capítulo aborda a percepção dos formuladores de política civis sobre a problemática amazônica e as medidas adotadas para incrementar a defesa militar da região. A principal fonte de pesquisa desta tese é a bibliografia militar, composta por discursos, entrevistas, documentos doutrinários, revistas, livros de memórias, e monografias de final de curso das Escolas de Comando e Estado- Maior das Forças Armadas. Para a elaboração desta pesquisa também foi consultada uma bibliografia acadêmica que trata das relações entre os civis e os militares no Brasil, de sociologia militar, e de relações internacionais. Ademais, foram consultados documentos parlamentares, como os anais da Câmara de Deputados e do Senado Federal, assim como os arquivos eletrônicos disponíveis na internet referentes aos partidos políticos brasileiros, aos Ministérios das Relações Exteriores, e da Defesa. / This thesis analyzes the Brazilian Armed Forces strategic thought about the Amazon and the military presence in the region. It shows that the identification of the Amazon as a strategic priority to Brazilian military is not due only to a reconfiguration of state security and defense interests. The importance given to the region by the military service derives from a framework of interests and symbolical elements. The first chapter presents the academic debate among neorealism, organization theory and constructivism about the origins of military doctrine. The second chapter analyzes the military discourse about the Amazon and its changes over the last two decades, giving special attention to the Army. The third chapter focuses the Army presence in the Amazon and the military strategies to its defense. The fourth chapter deals with the Navy and the Air Force perceptions on the Amazon security problems. The fifth chapter presents the civilian perceptions on the Amazon problem and the policies adopted in order to increase the military defense of the region. The main source of this research is the Armed Forces bibliography, which is composed by speeches, interviews, doctrinaire documents, military magazines, memory books and Military Academies degree monographies. An academic bibliography dealing with civil-military relations in Brazil, military sociology and international relations was also adopted. Besides, the thesis dealt with parliamentary documents (as the Proceeding of the Chamber of Deputies and of the Federal Senate), as well as internet electronic archives referring to political parties, Ministry of Foreign Affairs and Ministry of Defense.
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