Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1991. / Vita. Abstract. Includes bibliographical references (leaves 103-105). Also available via the Internet.

Thesis (Ph. D.)--George Washington University, 1992. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thèse-Neuchâtel. / "Bibliographie": p. [305]-310.

Thesis (Ph.D.)--York University, 2004. Graduate Programme in Environmental Studies. / Typescript. Includes bibliographical references (leaves 251-262). Also available on the Internet. MODE OF ACCESS via web browser by entering the following URL: http://wwwlib.umi.com/cr/yorku/fullcit?pNR11556

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Submitted by Eduarda Figueiredo (eduarda.ffigueiredo@ufpe.br) on 2015-03-10T16:59:04Z No. of bitstreams: 2 Dissertação Mestrado - Artur Angelo.pdf: 1754912 bytes, checksum: f99fef8e94e344bcb2290a439a03a99d (MD5) license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) / Made available in DSpace on 2015-03-10T16:59:04Z (GMT). No. of bitstreams: 2 Dissertação Mestrado - Artur Angelo.pdf: 1754912 bytes, checksum: f99fef8e94e344bcb2290a439a03a99d (MD5) license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Previous issue date: 2012-02-02 / Este estudo produz um panorama da indústria da água mineral na Região Metropolitana do Recife (RMR), registrando seus impactos econômicos, assim como o cumprimento da legislação em vigor. Outro aspecto identificado e avaliado é a qualidade do produto consumido pelos pernambucanos a partir dos parâmetros estabelecidos pelo Ministério da Saúde. A revisão bibliográfica apresenta os aspectos científicos e técnicos necessários para o aproveitamento da água mineral e o processo de legalização da indústria. A pesquisa envolveu visitas técnicas ao Departamento Nacional de Produção Mineral – DNPM, para coletar os dados indispensáveis a este estudo; e aos complexos industriais da RMR, para conhecimento presencial do processo produtivo. O estudo descritivo foi adotado a fim de identificar os tipos de captações, volume comercializado, empregos gerados, custo operacional, lucro líquido inicial, características físico-químicas dos produtos envasados nos complexos em atividade na RMR. Pernambuco é o segundo estado em volume de produção de água mineral no Brasil, o cruzamento das informações obtidas no estudo das captações da RMR torna possível afirmar que o envase e comercialização de água mineral na Região são atividades de alta lucratividade, sazonal, porém perene, de baixo risco com margem para expansão. No aspecto físico-químico, que determina a qualidade do produto, os dados coletados mostram a necessidade de maior fiscalização dos órgãos competentes para exigência do cumprimento das normas como os limites recomendados para o pH que é atendido por apenas 14% das indústrias avaliadas. Este estudo pode contribuir para o maior conhecimento e aperfeiçoamento das práticas e das Leis de monitoramento e análise do processo de industrialização e comercialização da água mineral em Pernambuco.

Orientador: Saul Barisnik Suslick / Dissertação (Mestrado) - Universidade Estadual de Campinas, Instituto de Geociencias / Made available in DSpace on 2018-07-24T09:52:10Z (GMT). No. of bitstreams: 1 Gueye_PapaAmadou_M.pdf: 3072119 bytes, checksum: 94298771b03050e7f9f88fef02122e76 (MD5) Previous issue date: 1998 / Resumo: o sistema de transporte interno de minério é um dos principais aspectos relacionados à produção com baixos custos. Para a jazida fosfática de Tobene com uma reserva lavrável de 50.000.000 de t de P2Os que a ICS prevê o inicio da lavra em 2001, as alternativas de transporte do minério representam um dos aspectos críticos em relação à viabilidade do projeto. Dentro deste contexto, este trabalho analisa quatro alternativas preliminares de transporte do minério de fosfato que deve ser extraído e movimentado da mina à usina de beneficiamento: o transporte por caminhões fora de estrada (Tcam), o transporte por mineroduto (Tmin), o transporte por correia transportadora (Tc) e o transporte por cápsulas (Tcap). Os resultados desse estudo mostram que o Tcam cujo dimensionamento para o transporte unicamente do minério prevê 9 caminhões, poderá vigorar em Tobene somente durante a lavra de Tobene-oeste, pois o trajeto dos caminhões é quase equivalente ao atual. O Tmin revela-se com custo menor e mais rentável que o Tc, entretanto, existe a possibilidade de eliminar um ou mais equipamentos que acompanham o Tc, podendo assim tomar seu investimento mais competitivo do que o Tmin. Quanto ao Tcap ele é apresentado como uma alternativa marginal, para referência e comparação para futures estudos / Resumé: Le systême de transport de minerai au niveau des mines est fondamental principalment en relation à Ia eompétitivité. En effet, pour le gisement phosphatique de Tobene, réserve exploitable de 50 000 000 de t de P20S dont les ICS (lndustries Chimiques du Sénégal) prévoient le début des exploitations en 2001, le dispositif de transport du minerai revêt une grande importance en relation à Ia viabilité du projet. Dans ce eontexte, ce travail propose, quatre altematives préliminaires de transport du minerai de phosphate qui doit être extrai et mouvementé de Ia mine à I'usine de traitement de minerai: le transport par camions ("dumpers") (Team), le transport par mineroducte (Tmin), le transport par eonvoyeur (Te) et le transport par capsules (Tcap). Ainsi nous avons pu conelur que le Tcam, dont le dimensionement pour le transport du minerai uniquement prévoit 9 camions, pourra être en vigueur à Tobene seulement durant I'exploitation de Tobene ouest, car le trajet des eamions est presque équivalent à I'aetuel. Le Tmin se révêle moins couteux et plus rentable que le Teonv, cependant il existe Ia possibilité d'éliminer un ou plusieurs equipements qui acompagnent le Teonv pouvant ainsi toumer son investiment moins élevé que celui du Tmin. Quant au Teap il est présenté comme une altemative marginale Qui pourrait servir de base de comparaison / Abstract: The ROM transportation system plays an important role in the low cost mining. In fact for the Tobene phosphate deposit, a 50,000,000 t of P20S exploitable reserve, that ICS will start the explotation in 2001, the ROM transportation method tias a big impact for the project feasibility. This dissertation proposes four transportation alternatives for ROM in the circuit mine-beneficiation plant: the transportation by dampers (Team), the transportation by pipeline (Tmin), the transportation by belt-conveyor (Te) and transportation by capsules (Teap). The main findings of this study indicate that the Tcam with 9 dampers for the ROM transportation, will be operational in Tobene only during the Tobene West exploitation, because the dampers movements are practically the same as used presently in the route. The Tmin is the cheapest alternative and provides more economical benefices than Te. But it is possible to withdraw one or more of Te components from its equipment system, achieving an investment level lower than the Tmin. The Teap is evaluate as a marginal alternative only for costs reference in this work / Mestrado / Mestre em Administração e Politica de Recursos Minerais

Vid produktionsborrning av spränghål kan valet av borrstål för dimensionen ca 70-100 mm variera mellan olika gruvor. Eftersom valet av borrstål har inverkan på mer än den direkta kostnaden finns ett behov att kvantifiera dessa. Examensarbetet syftar till att ge en värdering av för- och nackdelar mellan olika borrstål samt att överblicka nuvarande kostnads- och konsumtionsdata. Målet med arbetet är att kvantifiera behovet av en styvare borrsträng i samband med produktionsborrning med hänsyn till dess kostnadspåverkan. Eftersom en fullständig jämförelse av olika borrstål kräver omfattande fältstudier vilka överskrider den avsatta tiden för detta arbete ligger fokusområdet på deras inverkan på hålavvikelser och mediabehov. Genom att beräkna den spiralformade böjningens kastlängd för de olika borrstålen samt de radiella krafterna och momentkrafterna som verkar på borrkronan till följd av borrsträngens böjning kan borrstålets inverkan på hålavvikelsen identifieras. Mediabehovet, vare sig det är luft eller vatten, påverkas av den fria ytan som uppstår mellan borrstålet och borrhålsväggen. Genom att beräkna förbrukningen kan valet av borrstål motiveras. Resultaten visar tydliga differenser för kritisk last mellan de fyra studerade borrstålen där borrör, oavsett diameter, tål klart högre belastningar. De radiella krafterna och mediabehovet följer samma trend medan momentkrafterna är desamma för samtliga borrstål. Insamlad kostnads- och förbrukningsdata talar för att ingen ekonomisk vinning finns i att använda stänger istället för rör, snarare vice versa. Resultaten talar enhälligt för att långhålsborrning med rör är det bästa alternativet med avseende på hålkvalitet, mediabehov och kostnad. / When drilling blast holes of ca 70-100 mm in diameter with long hole drilling, it´s common to use different types of drill steel. Since the choice has an impact on more than the direct costs, there is a need to quantify the other effects. The sole purpose of this thesis is to give an evaluation of pros and cons for different drill steels and to use current cost and consumption data to dignify this. The goal is to understand the need of an increased stiffness in the drill string during production drilling with regards of their effect on total costs. A complete evaluation of the different drill steels would need extensive field studies which would extend beyond the time frame for this thesis. To accomplish some validated conclusions there´s a need to define a field of focus. This thesis focus on how the choice of drill steel impacts the hole deviation and the use of media. By calculating the helical pitch for the different drill steels, the lateral forces and the bending moment acting on the drill bit, the impact on hole deviation can be identified. The use of media, whether it´s air or water, for sufficient flushing is affected by the cross sectional area between the drill string and the hole wall. By estimating the volume needed for sufficient flushing, the choice of drill steel can be motivated. The results show differences in the applicable critical load for which the drill tubes show bigger capacity. The lateral forces and the use of media follows accordingly whilst the bending moment remains the same for all of the drill steels. Cost and consumption data show that there is no economic gain in using drill rods instead of drill tubes, rather the opposite.    The results are unanimously and supports that using drill tubes is the best alternative with regards to hole quality, use of media and overall costs.

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The horizontal water load combined with uplift forces implies that concrete damsare sensitive for sliding. At the same time, the safety of concrete dams againstsliding in the rock foundation is associated with large uncertainties. One of themain uncertainties regards the shear strength of rock joints. Several failure criteria exist to express the shear strength for unfilled and roughrock joints. However, these criteria do not in general consider a possible scaleeffect which means that the shear strength could be lower at larger scales. Somesuggestions exist for how a possible scale effect could be considered, but theseare mainly based on empiric grounds. This means that there exists a need of amore detailed and conceptual understanding on the scale effect of rock joints. In an attempt to increase the understanding on the scale effect of unfilled andrough rock joints, a conceptual model was derived. The model is based on theassumptions that contact points occur at the steepest asperities facing the sheardirection and that their total area could be expressed with adhesion theory. Fractaltheory is used in order to idealize the surface roughness by superposition ofasperities at different scales. Based on changes in the size and number of contactpoints, the conceptual model suggests that the scale effect does not occur for alltypes of rock joints. Perfectly mated joints are suggested to not exhibit any scaleeffect while a considerable scale effect could be expected for unmated joints. The practical implications from this, for foundations with unfilled joints, is thatunmated joints with large aperture are most critical for the sliding stability ofconcrete dams, since these joints probably are the ones with longest persistenceand lowest shear strength. In order to study the scale effect of rock joints further, eighteen shear tests atdifferent scales were performed. All of the samples were taken from the rockfoundation at Långbjörn hydropower station. Possible scale effects could beobserved, but no firm conclusions could be made, mainly due to different surfacecharacteristics of the tested joints. Three of the samples were also used toinvestigate the accuracy of the conceptual model. This investigation revealed thatit may be necessary to distinguish between weathered and unweathered joints,since the distribution of contact points appears to become more randomlydistributed for a weathered joint which in turn results in lower friction angles. In Sweden, dam safety is governed by the Swedish power company’s guidelinesfor dam safety, RIDAS. When the Swedish guidelines were compared withguidelines and regulations in other countries, it was realized that there exists aneed for a more balanced evaluation of the sliding stability for concrete damsfounded on rock in Sweden. In a first step of development, it can be based onsafety factors and an increased use of investigations. However, in a second step, anatural way of the development of RIDAS would be in a direction towardsreliability based methods. / <p>QC20100709</p>