Thesis (M. Sc.), Memorial University of Newfoundland, 1998. / Bibliography: leaves 187-201. Also available online.

Thesis (Professional Degree)--University of Missouri, School of Mines and Metallurgy, 1936. / The entire thesis text is included in file. Typescript. Title from title screen of thesis/dissertation PDF file (viewed June 9, 2010) Includes bibliographical references (p. 93).

Thesis (M.Sc.)--Memorial University of Newfoundland, 2004. / Bibliography: leaves135-137. Also available online.

Thesis (Ph. D.)--Missouri University of Science and Technology, 2010. / Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed June 30, 2010) Includes bibliographical references (p. 129-135).

Orientador: Jose Maria Ferreira Jardim da Silveira / Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Economia / Made available in DSpace on 2018-08-13T16:08:33Z (GMT). No. of bitstreams: 1 Pereira_AndreiaMara_M.pdf: 2199653 bytes, checksum: 1b294df053cf1354f02dcdc09008a457 (MD5) Previous issue date: 2009 / Resumo: O foco da presente dissertação de mestrado é descrever quais são os determinantes institucionais e econômicos da Bioprospecção no Brasil. Para tanto, identificou-se os principais obstáculos àbioprospecção no país, ressaltando que há muitas especificidades a serem consideradas na elaboração dos desenhos institucionais para bioprospecção, pois são práticas que envolvem agentes com interesses nem sempre convergentes. Para melhor visualização deste framework, foram feitos estudos de casos nacionais e internacionais e da Economia Institucional aplicada à bioprospecção. Dentro dos casos analisados, identificouse que, quando há participação de instituições intermediárias no processo de negociação, os interesses das partes são mais claramente atendidos. Esta conjuntura foi confirmada pelos dados do levantamento de opiniões efetuados através de um questionário estruturado para a captação dos efeitos e desafios atuais da bioprospecção, utilizando a ferramenta multicriterial AHP. Os resultados mostram que o ambiente institucional deve ser fortalecido, para proporcionar segurança aos possíveis interessados em investir nas atividades, através da melhoria das ações cooperativas e do direito de propriedade intelectual. Foi detectado que a área central para os entrevistados é a ambiental, sendo esta a prioridade para a criação de um "modelo institucional ótimo" / Abstract: The focus of this master's thesis is to describe what are the institutional and economic determinants of Bioprospecting in Brazil. For this purpose, the principle obstacles for bioprospecting in this country were identified, calling attention to the fact that there are many specificities which must be considered in the elaboration of the institutional designs for bioprospecting, since these practices involve agents whose interests do not always converge. To better visualize this framework, national and international case studies were performed and the Institutional Economy applied to bioprospecting. Among the cases analyzed, it was identified that when there is participation of the intermediary institutions in the negotiation process, the interests of all parties are more clearly met. This conjuncture was confirmed by the data resulting from an opinion poll executed by means of a questionaire constructed in order to discover the contemporary effects and challenges of bioprospecting, using a multicriterial tool called AHP. The results demonstrate that the institutional environment should be strengthened, in order to assure the interests of those who are potentially invested in bioprospecting through improving cooperative actions and intellectual property rights. It was found that the central area of interest for those who were interviewed is environmental, this being the priority for the creation of an excellent "institutional model." / Mestrado / Economia do Meio Ambiente

Orientador: Ricardo Caetano Azevedo Biloti / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica e Instituto de Geociências / Made available in DSpace on 2018-08-25T17:36:00Z (GMT). No. of bitstreams: 1 Pereira_AntonioJoseOrtolan_M.pdf: 8216164 bytes, checksum: 4d5f0b8002b7501bdb1134a354a50405 (MD5) Previous issue date: 2014 / Resumo: O foco deste trabalho é a análise da viabilidade da aplicação da interferometria sísmica na interpolação de traços. Tais traços foram usados no preenchimento de falhas na cobertura sísmica devido à presença de obstruções durante campanhas de aquisição sísmica marítima. O tema proposto é particularmente relevante pois a falta de cobertura sísmica degrada consideravelmente a qualidade das seções e cubos sísmicos, com um impacto negativo para a sísmica como insumo para a atividade de exploração de petróleo. Para o estudo do significado físico dos fenômenos interferométricos foi aplicado o método da fase estacionária em um refletor plano e inclinado, que pode ser tomado como um análogo do fundo do mar na região da quebra do talude continental. Posteriormente utilizamos a interferometria sísmica para interpolação de traços sísmicos em um conjunto de dados sintéticos. Os resultados mostraram que a interpolação interferométrica tem um bom potencial para criação dos traços virtuais com um baixo custo computacional / Abstract: The scope of this work was the analysis of feasibility of the Seismic Interferometry application in trace interpolation. These traces can be used to fill coverage gaps in seismic surveys. In general these gaps are created by the obstruction of seismic vessel tracks, due to the presence of platforms, vessels and other facilities in offshore oil fields. The trace interpolation is a particularly important step in seismic processing in order to avoid losses of quality in seismic sections, which impacts negatively the value of Seismic information in Exploration. One of the most promising use of this technique is the ability to create new positions of sources and receivers by cross correlating the seismic wavefield recorded. To understand the physical meaning of Seismic Interferometry we studied one of its fundamental equations by means of the Stationary Phase method, in a very simple geometry: a flat dip reflector. After this we applied the interferometric equation of correlation type to create new virtual traces (interferometric traces) using a synthetic dataset. The results showed the good potential of interferometric interpolation / Mestrado / Reservatórios e Gestão / Mestre em Ciências e Engenharia de Petróleo

M.Sc. (Geology) / The purpose of this study was to assess the MLA’s ability to characterise (e.g. modal mineralogy, elemental assay, particle size distribution, particle density distribution and mineral associations) a coal product from New Vaal Colliery, with the aim to determine any liberation and beneficiation characteristics. In general the MLA assessment on coal is comparatively new and novel, especially at Spectrum (University of Johannesburg), hence research in this regard is required. For the first time New Vaal coal product was characterised with the MLA 600 FEG SEM. The coal product supplied to Lethabo Power Station for the study’s samples, consisted of Top Seam and Middle Seam coal from New Vaal Colliery which is located in the Cornelia subbasin of the Vereeniging-Sasolburg coalfield, South Africa. The proximate analysis characterised the coal as a high-ash (42.25% air-dried) and low calorific value (13.92 MJ/kg air-dried) product. Chemically SiO2 was the most abundant oxide followed by Al2O3 for the XRF analysis, which was mostly derived from the abundant kaolinite clay mineral (determined by petrography, XRD and MLA analysis). Mineralogically inertinite was the most abundant coal maceral encountered during the petrographic analysis. With geochemical characterisation, chalcophile, siderophile, lithophile and radioactive trace elements were found to be mostly comparable to the global average.

The dissertation reviews the present knowledge regarding diamonds, from its formation in the lithospheric upper mantle at depths between 150 and 300 km, to its final valuation in terms of US$/carat by diamantaires in London, Antwerp, Tel Aviv and New York. The dissertation is divided into two complimentary sections. Section one focuses on the formation, emplacement, occurrence and characteristics of kimberlites and, when present, their associated trace amounts of diamonds. The section follows a logical sequence from the regional tectonic-, local structrual- and geodynamic controls on kimberlite formation and emplacement to the characteristics of individual kimberlite morphology, mineralogy, petrography and geochemistry. Finally, the environment or diamond formation, resorption and the characteristics that have led to the marketability of diamonds are discussed. Section two reviews the current exploration techniques used in locating diamondiferous kimberliies and the subsequent economic evaluation of these kimberlites. A brief history of known Southern African kimberlite occurrences, grades, tonnages, tectonic settings, ages and regional structural controls is given. The prospective countries mentioned are Angola, Botswana, Lesotho, South Africa, Swaziland, Tanzania and Zimbabwe. Exploration techniques considered are ; the application of a landscape analysis and investigation of the surface processes active in a given area, indicator mineral sampling (with reference to their mineralogy and exploration significance), remote sensing techniques (subdivided into satellite imagery and aerial photography), geophysical techniques (including the magnetic-, gravity-, electrical-, radiometric- and seismic methods as well as heat flow models), geochemical techniques, petrographic- and electron beam techniques as well as geobotanical- and geobiological techniques. Finally, a brief summary of current evaluation techniques employed on diamondiferous kimberlite deposits is presented. The review covers kimberlite sampling methods, sample processing, diamond grade distributions (with reference to the experimental variogram model, statistical methods used in grade distribution calculations as well as block definition and local grade estimation). Stone size distributions, including microdiamond counts and value estimation, are also discussed. / KMBT_363 / Adobe Acrobat 9.54 Paper Capture Plug-in

Please read the abstract in the section 00front of this document / Dissertation (MSc)--University of Pretoria, 2006. / Geography, Geoinformatics and Meteorology / MSc / Unrestricted

Orientador: Ricardo Caetano Azevedo Biloti / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica e Instituto de Geociências / Made available in DSpace on 2018-08-22T09:02:28Z (GMT). No. of bitstreams: 1 Morelatto_Rodrigo_M.pdf: 18147217 bytes, checksum: d648f520871bb48eaa46073833fe5fbf (MD5) Previous issue date: 2013 / Resumo: O tensor estrutural é uma ferramenta muito versátil, e pode ser utilizado para detectar bordas, estimar coerência e inclinações locais. Neste trabalho, o tensor estrutural é empregado para estimar inclinações locais em dados sísmicos. As inclinações estimadas com essa ferramenta são comparadas com as inclinações obtidas com duas implementações diferentes de destruidores de onda plana. Esses três métodos são testados contra diferentes conjuntos de dados, quatro sintéticos e um real. As inclinações estimadas com o tensor estrutural foram robustas e precisas o suficiente para aplicações práticas, comparáveis às inclinações obtidas com os destruidores de onda plana. Por fim, é apresentada uma aplicação prática para as inclinações estimadas com o tensor. Essas inclinações são empregadas para filtrar dados sísmicos ao longo dos eventos, utilizando dois métodos diferentes: filtragem adaptativa e o filtro preditor de estruturas. Esse tipo de filtragem é especialmente útil para interpretação, pois os dados são filtrados ao longo dos eventos, reduzindo a perda de informação e atenuando o ruído / Abstract: The structure tensor is a very versatile tool, which can be used to detect edges, estimate coherency and local slopes. In this work we employ the structure tensor to estimate local slopes. We compare the slopes obtained with this tool with the slopes obtained by two different implementations of plane-wave destruction filters. Those three methods were tested against different datasets, four synthetic and one real. The slopes detected through the structure tensor were reliable and comparable to the ones obtained with plane-wave destruction filters. Finally, we present an application for the slopes detected by the structure tensor. We show how to employ them to filter seismic data along structures using two different methods: adaptive filtering and structure prediction filtering. This kind of filtering is useful for interpretation, because it filters the data along the seismic events, reducing the loss of information and noise at the same time / Mestrado / Reservatórios e Gestão / Mestre em Ciências e Engenharia de Petróleo