Approved for public release, distribution is unlimited / The purpose of this study is to investigate U.S. Naval Academy student predictors of aviation selection for graduates between 1995 and 2002. The main hypothesis is that the background characteristics that predict aviation selectees will differ from the characteristics that predict non-aviation selectees. Although prior research suggests that several characteristics (academic, cognitive, athletic, and personality traits) play an important role in predicting success in aviation, other research suggests that many of those characteristics have not been included in the service selection process at the Naval Academy. Two empirical models were estimated to investigate this hypothesis. The models were used to determine whether the significance of predictive factors differ between all aviation selectees and non-aviation selectees, and likewise between pilot aviation selectees and non-pilot aviation selectees. The results show that of all of the variables in both models PFAR (an ASTB score) was the most important factor in predicting aviation selection. Both PFAR and academic grade point average at USNA had a large impact on aviation selection and separately on pilot selection. These results were representative of both aviation and pilot selection. It is also important to note that some variables were strong negative predictors in the models, although prior research suggested they would be positive predictors of aviation success. Apparently, the factors that predict success in aviation flight training are not the same that predict selection of the aviation community. / Lieutenant, United States Navy

M.Sc. (Eng.), Faculty of Engineering and the Built Environment, University of the Witwatersrand, 2012 / The aim of this research project was to test the response of ultra fine coal sourced at Klipspruit Colliery to froth flotation and the response of the froth flotation products to dewatering using two different types of filter presses, namely the Tecnicas Hidraulicas (TH) and the Ishigakhi presses. During test work, some difficulty was experienced with coarse material feeding the froth flotation pilot plant. This led to pilot plant modifications. Further process complexities necessitated laboratory scale flotation test work on the Klipspruit coal to be carried out. The results for both the laboratory scale and pilot plant test work for froth flotation indicated that froth flotation as applied to the Klipspruit fines was not economically feasible because neither the required quality of the product (calorific value of 27.80 MJ/kg) nor the product yield of 50% could be achieved when subjected to a primary and secondary stage of froth flotation. The coarse material, which fed the pilot plant and the Ishigakhi filter press, gave low moisture values (12.3%) not typical of ultra fine coal moisture values. However when fed with very fine particle size distributions, prior test work with the Ishigakhi showed that moisture values below 20% could be achieved. The moisture values obtained for very fine particles using the TH filter press on product thickener underflow material sourced at Goedehoop colliery reached values below 20%. Thus both of the two dewatering options, i.e. the Ishigakhi filter press equipment or TH filter press equipment for the ultra fine coal dewatering, can be utilized. Since the filter rate is the determining factor specifying filter press size, it was determined that a larger TH filter area is required in 1 comparison with the Ishigakhi press. Based upon the pilot and laboratory scale test work undertaken and the assessment of the results, it appears that both dewatering options could be successfully employed on a technical basis for the dewatering of coal flotation products, tailings and the arising raw ultra fine fraction. Froth flotation for Klipspruit ultra fine coal was deemed unfeasible for both pilot plant and laboratory scale tests conducted. For this reason a capital expenditure for the construction of a froth flotation plant at the Western Coal Complex Phola plant was not considered feasible since Klipspruit coal forms part of the feed that will feed the Phola plant. In conclusion, following dewatering using either the TH filter press or the Ishigakhi filter press, it was established that both froth flotation concentrate and unbeneficiated ultra fines gave acceptable total moisture results (below 20%). These dewatered raw ultra fines may therefore be blended into inland product as thermal coal to be utilised by Eskom for power generation. Based upon this premise, it is estimated that profits of 76.5 million Rand could be generated by blending Klipspruit ultra fine coal into thermal coal production at the new Phola plant.

En el presente estudio, tiene como objetivo reducir el alto índice de productos defectuosos, incrementando así los niveles de productividad en la empresa. Se explicarán los beneficios de la implementación de la metodología Lean Manufacturing en el proceso productivo textil en el área de tintorería y acabado de tela de la empresa TEXTIL SAN RAMÓN S.A. Por esta razón, se señala que si se implementa la metodología Lean Manufacturing, El trabajo está compuesto por tres capítulos. En el primer capítulo, se explica en qué consiste la metodología Lean Manufacturing. En el segundo capítulo, se presentará la situación actual de procesos actual de tintorería y acabado de tela. Asimismo, se describirá los principales beneficios de la implementación de la metodología Lean Manufacturing en el proceso de productivo textil, que buscará reducir el número de productos defectuosos en el proceso de tintorería y acabado de tela e incrementar los niveles de productividad de la empresa. Finalmente en el tercer capítulo se logra plasmar la implementación de esta metodología la cual resulta ser beneficiosa en el proceso de tintorería y acabado. Con estos resultados se evidencia que mediante la metodología Lean Manufacturing se puede reducir el índice de productos defectuosos significativamente, incrementando así en nivel de productividad, con el fin de reducir costos, aumentar la rentabilidad de la empresa y satisfacer las necesidades de los clientes. / In the present study, it aims to reduce the high rate of defective products, thus increasing productivity levels in the company. the benefits of implementing Lean Manufacturing in the textile production process in the area of fabric dyeing and finishing of textile SAN RAMON SA For this reason, it explained, noted that if the methodology is implemented Lean Manufacturing, The work is composed of three chapters. In the first chapter, it explains what Lean Manufacturing methodology. In the second chapter, the current situation of current processes dyeing and finishing fabric will be presented. Also, the main benefits of implementing Lean Manufacturing methodology will be described in the process of textile production, which seek to reduce the number of defective products in the process of dyeing and finishing fabric and increase the productivity levels of the company. Finally in the third chapter it manages to capture the implementation of this methodology which proves to be beneficial in the process of dyeing and finishing. With these results it is evident that through Lean Manufacturing methodology can significantly reduce the rate of defective products, increasing in level of productivity, in order to reduce costs, increase profitability and meet the needs of customers. / Trabajo de investigaciòn

A medição de vazão é fundamental para a gestão de processos que envolvem fluidos. Em empresas de saneamento, contabilizar as entradas e saídas de água é essencial para gerir faturamentos e perdas. A vazão pode ser mensurada através de diversos instrumentos com diferentes princípios de aplicação. O Tubo Pitot Cole é capaz de determinar a vazão em tubulações através do diferencial de pressão. Trata-se se um equipamento inventado em 1732 por Henri Pitot para determinar a velocidade, e aperfeiçoado por Eduard Cole, em 1896, permitindo sua aplicação em tubulações. As principais vantagens são o baixo custo e fácil instalação, que pode ocorrer com a tubulação em carga. Em contrapartida, a fragilidade e complexidade das suas peças motivaram este trabalho: a elaboração de um instrumento simples e robusto para medir a vazão. Propõe-se a construção de um protótipo com tomadas de pressão instaladas em faces opostas de um prisma hexagonal e a avalia-se a sua viabilidade na medição de vazão. Os resultados mostraram-se promissores dada a estabilidade e forte correlação linear obtida no coeficiente de calibração. / Flow measurements are essential for processes management that include fluids. In water companies, measuring inlets and outlets of water is essential to manage revenue and water losses. The water flow can be measured through different instruments with different application principles. The Pitot Cole Tube is able to determine flow in pipes through the pressure differential. This device was invented in 1732 by Henri Pitot to determine fluid velocity and it was improved by Eduard Cole in 1896, allowing to apply the instrument in pipes. The main advantages are the low cost and easy installation, that may occur with the pipe under load. However, the fragility and complexity of its pieces motivated this study: the construction of a simple and robust instrument to measure the water flow. It is proposed the construction of a prototype with pressure plugs installed on opposite faces of a hexagonal prism, then evaluation of its effectiveness in water flow measurements. The results were promising given the stability obtained in the calibration coefficient.

As moagens autógena (AG) e semiautógena (SAG) mostram-se como opções cada vez mais consideradas na seleção de novos circuitos de cominuição. A flexibilidade de operação, assim como a combinação de grandes capacidades de processamento e altas relações de redução obtidas, são algumas das vantagens destes circuitos. Este trabalho procurou descrever o método utilizado na condução de ensaios de moagem semiautógena em escala piloto e de caracterização tecnológica, empregando o minério de ouro da Rio Paracatu Mineração S/A (RPM). A moagem semiautógena foi investigada considerando diferentes condições de operação e às especificidades do minério da RPM. Foram conduzidos 69 ensaios em planta piloto que permitiram o estudo do efeito das variáveis de operação sobre parâmetros de moagem SAG, como taxa de processamento, consumo energético específico, qualidade do produto, entre outros. As informações obtidas na campanha de ensaios em planta piloto e nos trabalhos de caracterização das amostras mostraram-se consistentes e fundamentaram o dimensionamento e projeto do circuito de Expansão da RPM, com capacidade de processamento adicional de 41 Mtpa. / The autogenous (AG) and semi-autogenous (SAG) mills have increasingly been considered options in the selection of new comminution circuits. The flexibility of the operation, as well as the combination of high processing capacity and high reduction rates obtained, are some of the advantages of these circuits. This study sought to describe the method used in conducting semi-autogenous grinding pilot plant and technological characterization, using the gold ore from the Rio Paracatu Mineração S/A (RPM) mine. The semi-autogenous grinding was investigated considering different operating conditions and specific characteristics of the ore from the Rio Paracatu Mineração mine. Were conducted 69 tests in a pilot plant that enabled the study of the effects of the operating variables of the SAG grinding parameters such as processing rates, specific energy consumption, product quality, among others. Information obtained in the test campaign of the pilot plant and the characterization work of the samples were consistent and supported the design and project of the circuit of the expansion of the Rio Paracatu Mineração mine, with additional processing capacity of 41 Mtpy.

Made available in DSpace on 2016-07-27T14:21:19Z (GMT). No. of bitstreams: 1 Raul France Monteiro.pdf: 1001126 bytes, checksum: 29afd144051ec57332843f8ceac20262 (MD5) Previous issue date: 2007-03-12 / The Brazilian air transportation, also known as commercial air transportation, has been object of remarkable changes in the past 30 years. One of the main points of these changes results from the introduction of new technologies in the aircrafts cockpits, resumed after its automation in the expression glasscockpit . These technologies represent substantial changes on the pilot activity. The actual study focused on the research of the pilot social representation, trying to identify the probable effect of new technologies on the representation that pilots elaborate about their professional activity. It was used as a starting point for the carrying out of this project the Theory of Social Representations. To carry out this project, 216 subjects, pilots, divided in three categories by a time variable, a group was compiled by youths with less than ten years of activity; other pilots, developing the activity between 10 and 20 years and, finally, professionals with more than 20 years in activity, they participate of an empirical research. The social representation of the pilot, the professional experiences and the aviation changes perception were the axis investigated. The results allow us to suppose that general changes due to the using of new technologies are positive, that the subjects worries seem to judge other changes and that less experienced pilots offer excessive confidence to technology as safety manager. / O transporte aéreo no Brasil, também chamado de transporte aéreo comercial, foi objeto de marcantes transformações nos últimos 30 anos. Um dos principais focos destas transformações decorre da introdução de novas tecnologias na cabine de comando, condensadas após sua automação na expressão glasscokpit . Estas tecnologias representam mudanças substanciais na atividade do piloto. O presente estudo teve por objetivo pesquisar a representação social de piloto, buscando identificar o provável impacto das novas tecnologias na representação que pilotos elaboram sobre sua atividade profissional. Tomou-se por base para a realização desta investigação a Teoria das Representações Sociais. Para realizar este objetivo, 216 sujeitos, pilotos, divididos em três grupos por uma variável temporal, compuseram um grupo formado por jovens com menos de dez anos de atividade; outros pilotos, desenvolvendo a função entre 10 e 20 anos e, finalmente, profissionais com mais de 20 de serviços, participaram de uma pesquisa empírica. A representação social do piloto, as práticas profissionais e a percepção das transformações na aviação foram os eixos investigados. Os resultados permitem supor que as transformações gerais por conta da tecnologia são positivas, que as preocupações dos sujeitos parecem julgar outras transformações e que os pilotos menos experientes oferecem confiança excessiva à tecnologia como gestora da segurança.

Este projeto apresenta a construção de um modelo numérico do Sistema Aqüífero Guarani pelo método de elementos finitos para auxiliar o gerenciamento de recursos hídricos subterrâneos na área do projeto piloto de Ribeirão Preto, localizada na região nordeste do Estado de São Paulo. Dados topográficos, hidrológicos e hidrogeológicos da região de interesse foram obtidos principalmente de mapas (impressos e digitais) e poços cadastrados junto a órgãos governamentais, em cooperação com o grupo coordenador do projeto piloto de Ribeirão Preto. Os dados levantados foram armazenados, processados e analisados utilizando ferramenta SIG, seguida da geração de mapas interpolados com características hidrogeológicas. Esses dados foram transferidos para o software de simulação SPA, onde se deu a construção da malha de elementos finitos e a atribuição dos parâmetros e condições de contorno ao modelo. Em seguida, foi feita uma análise de sensibilidade do modelo, e testadas algumas configurações de parâmetros hidrogeológicos e de taxas de recarga. O modelo apresentou bons resultados e desempenho, e, como parte de uma constante evolução, são propostas visitas de campo para verificação de dados para o seguimento desse projeto. / This work presents a numerical model for the Guarani Aquifer System management in the Ribeirão Preto pilot project area, located in the Northeast of São Paulo State. Topographical, hydrological and hydrogeological data of the region were obtained from printed and digital maps and well database recorded in governmental departments, in cooperation with the Ribeirão Preto coordinating group of the pilot project. The collected data were stored, processed and analyzed making use of GIS tool, followed by the generation of interpolated maps with hydrogeological parameters. These data were transferred to the SPA simulation software, which is based on the finite element method. After mesh construction, and attribution of parameters and boundary conditions, a sensitivity analysis of the model was performed. Different hydrogeological parameter configurations were tested. The model proved to represent the established conceptual model adequately. However base flow data and field visits are necessary, in order to improve the model representativity.

A reutilização de resíduos e sua destinação são desafios seguidamente enfrentados na indústria. Por ser extensa e empregar uma grande variedade de processos, matérias-primas e insumos, a cadeia do aço se beneficia por ter ampla flexibilidade e diversas possibilidades de reintrodução de compostos em sua rota de fabricação. Resíduos carbonosos, por exemplo, podem ser parcialmente usados em misturas de carvões no processo de coqueificação dependendo do tamanho e da composição química. Este trabalho, teve como objetivo, avaliar a influência da adição de moinha de carvão vegetal em uma mistura de carvões para a produção de coques em forno piloto de coqueificação e determinar os teores máximos de incorporação suportados pela mistura, avaliando parâmetros de qualidade do coque. Para isso, a moinha de carvão vegetal de eucalipto foi introduzida em duas frações granulométricas distintas, uma composta por partículas mais grosseiras (fração G) e outra composta por partículas mais finas (fração F), e caracterizado juntamente com a mistura utilizada. Posteriormente, os coques produzidos em forno piloto também foram caracterizados através de diversas análises: imediata, elementar, área superficial, porosidade, textura óptica, reatividade em termobalança, CRI/CSR e DI150/15. Os resultados atingidos mostraram que inserção da fração G de moinha comprometeu menos os parâmetros de qualidade dos coques com carvão vegetal. Teores de até 3% de moinha foram suportados para essa distribuição de tamanho de partícula enquanto que para a fração F, somente 1%. Outro fator observado foi que os coques produzidos com adição de moinha de carvão vegetal não tiveram queda significativa no teor de enxofre, a exceção da amostra contendo 10% de carvão vegetal na fração G. Em todas as amostras com moinha de carvão vegetal também foi possível notar o aumento da área superficial em relação ao coque de referência. Os testes termogravimétricos dinâmicos também trouxeram informações relevantes a respeito das temperaturas e taxas aparentes de reações dos coques feitos com moinha de carvão vegetal. / The reuse of waste materials and its destination are challenges continuously faced for industry. For being far-flung and apply a huge variety of process, raw materials and inputs, the steel supply chain benefits from having a high flexibility and many possibilities of reintroducing compounds in its manufacturing route. For example, carbonaceous materials can be used partially in coal blends for cokemaking process depending on particle size and chemical composition. The current work aimed to evaluate the influence of adding fine charcoal to a coal blend for coke production in a pilot oven and to determine the maximum content tolerated for the blend, assessing coke quality parameters. For this, a eucalyptus charcoal residue was introduced in two different size distributions, one composed of coarser particles (fraction G) and another of finer (fraction F), and characterized together with the coal blend used. Afterwards, the cokes produced in pilot oven were also characterized through several analyzes: proximate, ultimate, surface area, porosity, optical texture, reactivity on thermobalance, CRI/CSR e DI150/15. The results achieved showed that the insertion of charcoal on fraction G compromised less the quality parameters of cokes with charcoal. Contents up to 3% of charcoal were tolerated for this particle size distribution while for fraction F, only 1%. Another point noticed was that the coke produced with charcoal addition had no significant drop on sulfur content, with the exception of the coke sample with 10% of charcoal and fraction G. In all samples with charcoal it was also possible to see an increase on surface area in relation to the reference coke. The dynamic thermogravimetric tests also provided relevant information regarding to the temperatures and apparent reaction rates of cokes made with charcoal.

Thesis. 1976. M.S.--Massachusetts Institute of Technology. Dept. of Aeronautics and Astronautics. / MICROFICHE COPY AVAILABLE IN ARCHIVES AND AERONAUTICS. / Includes bibliographical references. / by David M. Stofko. / M.S.

Background. Depression and anxiety are common and debilitating disorders, and at least one third of patients do not respond to available interventions. Morita Therapy, a Japanese psychological therapy which contrasts with established Western approaches, is currently untested in the UK and may represent a potentially effective alternative approach. Aim. To optimise and investigate the feasibility and acceptability of Morita Therapy as a treatment for depression and anxiety in the UK. Design. Three studies were undertaken in line with the MRC framework (2008) for complex interventions. Study One: scoping and systematic review to describe the extent, range and nature of Morita Therapy research activity reported in English. Study Two: intervention optimisation study, integrating literature synthesis with qualitative research, to develop the UK Morita Therapy outpatient protocol. Study Three: mixed methods feasibility study encompassing a pilot randomised controlled trial (RCT) and embedded qualitative interviews to prepare for a fully-powered RCT of Morita Therapy versus treatment as usual (TAU). Results. Study One: 66 papers meeting the inclusion criteria highlighted heterogeneity in the implementation of Morita Therapy, and an absence of both UK-based research and relevant unbiased RCTs. Study Two: a potentially deliverable and acceptable therapy protocol and tailored therapist training programme were developed for a UK population. Study Three: 68 participants were recruited and 94% retained at four month follow-up; 70.6% of Morita Therapy participants adhered to the minimum treatment dose, and 66.7% achieved remission in depressive symptoms (compared to 30.0% in TAU). Qualitative and mixed methods findings indicated that Morita Therapy was broadly acceptable to therapists and participants, and highlighted potential moderators of acceptability, treatment adherence and outcomes. Conclusions. Patients in the UK can accept the premise of Morita Therapy and find the approach beneficial. It is feasible to conduct a large-scale UK-based trial of Morita Therapy with minor modifications to the pilot trial protocols.