Made available in DSpace on 2016-08-29T15:32:51Z (GMT). No. of bitstreams: 1 tese_4070_Dissertacao_Breno.pdf: 2337399 bytes, checksum: 050f06caeff0748499321e75941a5f38 (MD5) Previous issue date: 2009-12-22 / A remoção eficiente de cascalhos ainda é um desafio na perfuração de poços para produção de óleo e gás. O ponto crítico corresponde ao estágio horizontal da perfuração que intrinsecamente tende a formar um leito de partículas sedimentadas na parte inferior do poço em perfuração. A erosão desse leito de cascalhos oriundos do solo perfurado depende principalmente da tensão de cisalhamento promovida pelo escoamento do fluido de perfuração. Utilizando uma bancada experimental, composta de sistema para circulação de fluidos, caixa de cascalhos, unidade de bombeio e equipamentos de medição, investiga-se a tensão de cisalhamento mínima necessária para a erosão de um leito em função das propriedades do fluido e das partículas do leito. A área de observação consiste de uma caixa abaixo da linha de escoamento, para partículas de areia calibradas, em um duto de acrílico. Para as medições iniciam-se as bombas com baixa rotação e são feitos incrementos de freqüência. A cada patamar de freqüência são capturadas imagens de partículas carreadas pelo escoamento, registrando a vazão estabelecida. Com a análise do processamento das imagens define-se o momento em que o carreamento das partículas deixa de ser aleatório e esporádico e começa a ser permanente. A tensão de cisalhamento é determinada pela Correlação PKN (de Prandtl, von Kármán e Nikuradse) a partir da vazão mínima necessária para o arraste. Os resultados são obtidos para o escoamento de água e de solução água-glicerina. Palavras-chave: Tensão de cisalhamento. Erosão de leito. Perfuração horizontal. Pag. 79

In this thesis we discuss drawbacks of the event horizon which is defined glo- bally in spacetime and we introduce a quasilocal definition of black hole boundary foliated by marginally trapped surfaces on which the expansion of the outer null normal congruence becomes zero. List of different types of quasilocal horizons follows, i.e. apparent horizon, trapping horizon and isolated and dynamical hori- zon. Subsequently we calculate and analyse quasilocal horizons in two dynamical spacetimes which are used as inhomogeneous cosmological models. We discover future and past horizon in spherically symmetric Lemaître spacetime and we come to conclusion that both are null and have locally the same geometry as the ho- rizons in the LTB spacetime. Then we study Szekeres-Szafron spacetime with no symmetries, particularly its subfamily with β,z ̸= 0, and we derive the equation of the horizon. However, because of the lack of symmetries the spacetime is not adapted to double-null foliation, therefore we were unsuccessful in our attempts to estimate the equation's solution. Only in a special case when the function Φ does not depend on the coordinate z we found a condition on the existence of the horizon, that is Φ,t Φ > 0. 1

Resumé (En) Key words: Body, soma, sarx, pexis, horizon, aesthesis, corporate scheme, body art, body modifications. This thesis deals with body and its manifestation. The body is conceived as philosophic, anthropologic and psychic phenomenon. Philosophic part determinates body as soma, sarx and pexis. The phenomenon as corporate scheme, horizon, motion and aesthesis are used for better understanding as well. Next part deals with body as anthropologic phenomenon. Body modifications, suspensions and their history are showed here. The research makes clear minds and reasons of extremely modificated persons. The last part is psychological. Problems related with wrong corporate scheme are described, as well as evolution of body's perception.

This thesis deals with the processing and comparing information on the thickness of A0 horizon (humus mulch) forming anthropogenic soils in forestry reclamation Sokolov brown coal basin. Comparison of data found in Bažantnice Bohemie reclaimed forestry in 1923 with newer areas of forestry reclamation dumps Velký Riesl, Dvory, Gustav and data from previous studies on the Velká podkrušnohorská výsypka. This thesis deals with finding major differences, especially power, humus horizons A0, depending on the time of the establishment of forest reclamation and the reclamation age of trees. To unify and minimize variables are all shallow pits removed under alder sticky. Based on field research was collected from each of five shallow soil probes on each of the dumps. Probes were taken evenly over the surface of the dump and always under identical reclamation trees. Were identified basic characteristics of humus horizon A0 and the individual probes was a proper photographs. Based on removing shallow soil pits were identified basic characteristics of humus horizon A0. The test was conducted in the laboratory granularity to better implement the results of the work in the coming years. Identified the basic characteristics of humus layers A0 are mutually compared and evaluated basic statistical methods. From the data obtained were created layers in ArcGIS, which were interpreted in this thesis and stored on a data carrier, mainly because of their possible use for further research needs in the coming years.

This diploma thesis is focused to possibilities of investment on financial market in the Czech Republic and subsequent proposal investment portfolio for different types of investors. The first part of thesis contents definition of individual investment instruments which is able to include as proposal of investment portfolio selected investors. Further includes definitions forms investment triangle which are efficiency, liquidity and riskiness. In the second part are defined characteristics of selected investors, determined their available financial resources suitable for investment together with their aims and needs. Following determination of their relation to risk is based on the Investment questionnaire. The main part is focused on analysis and further comparison of selected investment instruments which are suitable for different type of investors. Proposals for conservative and dynamic investor are based on analysis of investors. Each proposal contents these instruments which meets criteria and requirements of investors, mainly based on diversification and risk.

This thesis deals with the possibilities of investing in the financial market in the Czech Republic for free different types of investors who are different attitude to risk. The first part is generally characterized by the term investment, portfolio theory, types of investment strategies and variol investment instruments, whether in individual investment, as well as in collective investment schemes in which we invest, thereby realizing their funds. Own part is then focused on the modeling of achal investment portfolio for conservative, balanced and aggressive investor. For each of them is first characterized by its current portfolio, which have been shown in some parts as unsatisfactory and there for esubsequently proposed a new, more that meets investor requirements. They are considered basic requirements for return, risk and liquidity, as well as time horizon, which represents investor. Also, investor perceptions and visions for the future. In conclusion thee valuation of the diference between the current and new lyproposed investment portfolio for each client.

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / Linhas Imprevistas no Horizonte é uma reflexão sobre experiências de desestabilização de um limite imaginado da paisagem, sugerido pela linha do horizonte. Este traço do pensamento é materializado através de vídeos ou objetos em operações poéticas que investigam novos olhares sobre a paisagem. São registros de gestos que se situam entre a desconstrução e a permanência dessa demarcação fictícia. Os trabalhos partem da linha enquanto elemento essencial do desenho para investigar as tensões produzidas ao redesenhar as fronteiras desestabilizadas. Aproximações, deslocamentos, superposição de imagens, espelhamentos e alteração de escalas são alguns dos recursos explorados para questionar o visível e resignificar a paisagem natural. Da mesma forma que cartografias e objetos antigos agregam novos significados às linhas que compõem paisagens poéticas. Assim os trabalhos oscilam entre o desejo de imersão no espaço para fazer fugir os limites e a necessidade de distanciar-se para ver sem perder o foco. Conceitos surgem de conexões entre a arte e a biologia e buscam repensar vivências associadas à sensação de desterritorialização. O que move o processo artístico é a reinvenção constante das identidades humanas e territoriais, associada à noção de paisagem como uma experiência do corpo no espaço / Linhas Imprevistas no Horizonte is a reflection over experiences of destabilization of a imaginated limit of the landscape, suggested by the horizontal line. This line of thought is materialized throughout videos or objects in poetic operations that investigate new gazes over the landscape. They are registrations of gestures that are situated between the deconstruction and the permanence of this fictive borderline. The artworks started from the line as essential element of drawing to investigate the tensions produced by redrawing the destabilizated frontiers. Approximations, displacements, overlapping of images, mirrowings and alterations of scales are some of the ways explored to question the visible and to redefine the natural landscape. In the same way that maps and old objects bring new meanings to the lines that compose poetic landscapes. So the works swing between the desire of diving in the space to take away the limits and the necessity of take distance to see without loosing the focus. Concepts appear out of conexions between art and biology and search for rethought life experiences associated with the sensation of deterritorialization. What moves the artistic process is the permanent reinvention of human and territorial identities, associated with the idea of the landscape as an experience of the body in space

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / Linhas Imprevistas no Horizonte é uma reflexão sobre experiências de desestabilização de um limite imaginado da paisagem, sugerido pela linha do horizonte. Este traço do pensamento é materializado através de vídeos ou objetos em operações poéticas que investigam novos olhares sobre a paisagem. São registros de gestos que se situam entre a desconstrução e a permanência dessa demarcação fictícia. Os trabalhos partem da linha enquanto elemento essencial do desenho para investigar as tensões produzidas ao redesenhar as fronteiras desestabilizadas. Aproximações, deslocamentos, superposição de imagens, espelhamentos e alteração de escalas são alguns dos recursos explorados para questionar o visível e resignificar a paisagem natural. Da mesma forma que cartografias e objetos antigos agregam novos significados às linhas que compõem paisagens poéticas. Assim os trabalhos oscilam entre o desejo de imersão no espaço para fazer fugir os limites e a necessidade de distanciar-se para ver sem perder o foco. Conceitos surgem de conexões entre a arte e a biologia e buscam repensar vivências associadas à sensação de desterritorialização. O que move o processo artístico é a reinvenção constante das identidades humanas e territoriais, associada à noção de paisagem como uma experiência do corpo no espaço / Linhas Imprevistas no Horizonte is a reflection over experiences of destabilization of a imaginated limit of the landscape, suggested by the horizontal line. This line of thought is materialized throughout videos or objects in poetic operations that investigate new gazes over the landscape. They are registrations of gestures that are situated between the deconstruction and the permanence of this fictive borderline. The artworks started from the line as essential element of drawing to investigate the tensions produced by redrawing the destabilizated frontiers. Approximations, displacements, overlapping of images, mirrowings and alterations of scales are some of the ways explored to question the visible and to redefine the natural landscape. In the same way that maps and old objects bring new meanings to the lines that compose poetic landscapes. So the works swing between the desire of diving in the space to take away the limits and the necessity of take distance to see without loosing the focus. Concepts appear out of conexions between art and biology and search for rethought life experiences associated with the sensation of deterritorialization. What moves the artistic process is the permanent reinvention of human and territorial identities, associated with the idea of the landscape as an experience of the body in space

Master's thesis "Philosophy and community" looks into the origin of ancient greek term "polis" and inception of its citizen. It looks into it as specifical means of being of world and human. The correlation of polis and citizen is most apparent in philosophy of Plato. With an emphasis on his privilegy of spoken word over written one, he shows possible sources of philosophical hermeneutics. By understanding the situation, which leads to the decline of the reciprocal relationship between human and world, author would like to express that in Platos way of thinking are still unreflected possibilities of solution for the present day. Intention of this work is to contribute - by sketching and explication of the principles of political thinking - to the discussion - and not only to that of the political philosophy and political science.

In 2009 Bañados, Silk and West described the possibility of principally unbounded collision energies in the centre-of-mass frame for the particle collisions in the vicinity of black holes. Their work attracted a big response. This thesis aims to summarise the results of a number of the articles about the topic and puts these results into a new, broader context. It also presents some generalisations of the existing results, especially for models of magnetised black holes. The main subject of interest is the question, whether the unbounded collision energies can be achieved in a single-scattering or multiple-scattering process which was first formulated by Grib, Pavlov and Zaslavskii. Variety of methods is summarised. A considerable attention is paid to the limiting near-horizon description, which is further developed in order to derive new links and relations among known results, particularly between the purely theoretical work dealing with the geometry of degenerate horizons and their vicinity and more astrophysical articles about magnetic fluxes. Powered by TCPDF (www.tcpdf.org)