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Dissertations / Theses on the topic 'MAPOD'

Author: Grafiati

Published: 25 May 2024

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1

Azzabi, Zouraq Brahim. "Optimisation du procédé de contrôle non destructif par thermographie inductive pour des applications du domaine nucléaire." Thesis, Nantes, 2019. http://www.theses.fr/2019NANT4023/document.

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Les travaux de cette thèse traitent d’une technique de contrôle non destructif (CND) novatrice et de son adaptation au domaine du nucléaire civil. L’outil numérique est utilisé à cette fin. Une présentation exhaustive des modèles numériques adaptés à la problématique est tout d’abord faite. Ces outils sont par la suite implémentés et leurs performances comparées. Ceci a permis de mettre en place un outil numérique rapide et capable de prendre en comptes différentes contraintes de modélisation. Il s’agit plus essentiellement de la prise en compte du circuit, d’alimentation du système de chauffe

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2

Reseco, Bato Miguel. "Nouvelle méthodologie générique permettant d’obtenir la probabilité de détection (POD) robuste en service avec couplage expérimental et numérique du contrôle non destructif (CND)." Thesis, Toulouse, ISAE, 2019. http://www.theses.fr/2019ESAE0014/document.

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L’évaluation des performances des procédures de Contrôle Non Destructifs (CND) en aéronautique est une étape clé dans l’établissement du dossier de certification de l’avion. Une telle démonstration de performances est faite à travers l’établissement de probabilités de détection (Probability Of Detection – POD), qui intègrent l’ensemble des facteurs influents et sources d’incertitudes inhérents à la mise en œuvre de la procédure. Ces études, basées sur des estimations statistiques faites sur un ensemble représentatif d’échantillons, reposent sur la réalisation d’un grand nombre d’essais expérim

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3

Fugita, Henrique Shoiti. "MAPOS: método de análise e projeto orientado a serviços." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/3/3141/tde-15092009-171050/.

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Com a crescente adoção do conceito de Arquitetura Orientada a Serviços (SOA) pelas organizações, torna-se necessário solucionar um dos principais desafios trazidos por este estilo arquitetural, que é a análise e projeto de serviços. Alguns métodos de análise e projeto de soluções orientadas a serviços vêm sendo propostos, mas ainda estão longe de convergir em direção a uma padronização. Este trabalho realiza uma avaliação crítica dos métodos existentes e levanta um conjunto de requisitos de análise e projeto orientado a serviços. Baseado nesta análise, é proposto um método para unificar as boa

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4

Cresswell, Sarah Louise. "A systematic study of the synthesis of aluminophosphate-based materials." Thesis, University of Greenwich, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389507.

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5

Massa, Ana Rosa Caribé de Góes. "Analisador virtual para a determinação do teor dos contaminantes mapd em um reator tricklebed." Escola Politécnica da Universidade Federal da Bahia, 2017. http://repositorio.ufba.br/ri/handle/ri/25218.

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Submitted by Uillis de Assis Santos (uillis.assis@ufba.br) on 2018-01-26T13:26:54Z No. of bitstreams: 1 AnaRosaCaribédeGóesMassa_Dissertação-UFBA-Politécnica-EngenhariaIndustrial-2017.pdf: 4582890 bytes, checksum: 3c5c6099462e9b7f61ff397081c5dd6a (MD5)<br>Approved for entry into archive by Vanessa Reis (vanessa.jamile@ufba.br) on 2018-01-26T16:03:46Z (GMT) No. of bitstreams: 1 AnaRosaCaribédeGóesMassa_Dissertação-UFBA-Politécnica-EngenhariaIndustrial-2017.pdf: 4582890 bytes, checksum: 3c5c6099462e9b7f61ff397081c5dd6a (MD5)<br>Made available in DSpace on 2018-01-26T16:03:46Z (GMT). No. of bitst

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Pinho, Bruno Miguel da Silva. "Les propriétés spécifiques des fluides supercritiques au service des systèmes réactifs contraignants." Thesis, Bordeaux, 2015. http://www.theses.fr/2015BORD0229/document.

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Le développement de nouveaux catalyseurs pour l’hydrogénation sélective du propyne et du propadiène (MAPD) est un processus complexe, puisqu’il s’agit d’une réaction rapide effectuée en gaz-liquide-solide. Dans ces conditions, le flux d'hydrogène transporté aux sites actifs du catalyseur contrôle la vitesse de la réaction, particulièrement à l’échelle pilote. Cela rend difficile la comparaison des performances des différents catalyseurs (conversion et sélectivité). Afin d’améliorer la discrimination des solides, l’hydrogénation sélective du MAPD a été étudiée en monophasique (fluide/solide) da

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7

Porto, Obanshe Severo D. Acelino e. "Medida da capacidade anaeróbica em atletas dos esportes coletivos de invasão : MAOD e Line Drill Test." Universidade Federal de Sergipe, 2015. https://ri.ufs.br/handle/riufs/4944.

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The anaerobic capacity is crutial to the results of team invasion games and can be assessed through the Line Drill Test (LDT), which shows correlations with Wingate. Its results and execution time is commonly obtained using manual timers. The anaerobic capacity can also be measured by the Maximal Accumulated Oxygen Deficit (MAOD), adopted as the gold standard for this capability. The classic version of this method requires time and cost relatively high, while the alternate version (MAODALT), although, although it presents time and execution costs reduced, has been validated exclusively for the

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VAZ, Lucyana Galindo Arcoverde. "Efeito do consumo agudo de cafeína na capacidade anaeróbia quantificada pelos principais métodos de estimativa." Universidade Federal de Pernambuco, 2016. https://repositorio.ufpe.br/handle/123456789/17771.

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Submitted by Fabio Sobreira Campos da Costa (fabio.sobreira@ufpe.br) on 2016-08-31T14:27:00Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Dissertação Mestrado LUCYANA GALINDO ARCOVERDE VAZ.pdf: 1541733 bytes, checksum: 075c4e7b9b3f5f39a8de2b68a1df2f24 (MD5)<br>Made available in DSpace on 2016-08-31T14:27:00Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Dissertação Mestrado LUCYANA GALINDO ARCOVERDE VAZ.pdf: 1541733 bytes, checksum: 075c4e7b9b3f5f39a8de2b68a1df2f24 (MD5) Previous issue

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Abbondanza, Marco. "Valutazione di strategie per la previsione dell'anticipo limite di detonazione." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/9657/.

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Effettuare la calibrazione di un motore a combustione interna richiede precisione e al contempo tempi ridotti per poter essere eseguita in modo rapido e sicuro sui banchi prova. In questo elaborato viene trattata in particolare la calibrazione dell’anticipo di accensione, parametro fondamentale per massimizzare la PMI e quindi le prestazioni di un motore da corsa, ma altrettanto delicato per quanto riguarda il fenomeno della detonazione in cui si può incorrere attuando combustioni troppo anticipate durante la ricerca della fase ottimale. Con l’esigenza di dover calibrare il singolo motore in m

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Oliveira, Juliano Elvis de. "Estudo de monocamadas fosfolipidicas nanoestruturadas obtidas por LB para aplicações em biossensores." Universidade Federal de Minas Gerais, 2007. http://hdl.handle.net/1843/MAPO-7R5QQF.

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There has been long-standing interest in the physical chemical properties of defined mixtures of cholesterol and phospholipids in monolayer and bilayer membranes. They also provide insight into certain properties of the membranes of animal cells. Even if phospholipids and sphingolipids build up the matrix of cellular membranes, sterols are essential components of these membranes. In contrast to the amazing diversity of phospholipid species, mammalian cells contain one major sterol, cholesterol, which is absolutely required for viability and cell proliferation. The studies of phospholipid monol

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Salum, Maria Jose Gazzi. "Estudo do uso do magstream na flotabilidade de alguns sistemas minerais." Universidade Federal de Minas Gerais, 1999. http://hdl.handle.net/1843/MAPO-88LQ5W.

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present work consists of a series of studies involving the effect of the use of Magstream on mineral surface properties, specifically quartz and pyrite. The Magnetic fluidused by the equipment, a mixture of lignin sulphonate and iron salts, the Magfluid, is responsible for changes on mineral surfaces. The first change observed on quartz characteristics, after it was processed in Magstream, was a change of color from transparent to brownish. The studies in the electron microprobe showed that the contact between quartz and Magfluid produces two kinds of precipitates on the quartz surface. One of

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Rodrigues, Henrique de Castro. "Simulação em laminador piloto da influência da lubrificação durante o processo de deformação a quente na microestrutura e textura do aço inoxidável ferrítico AISI 430." Universidade Federal de Minas Gerais, 2008. http://hdl.handle.net/1843/MAPO-88LQSY.

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This work deals simulation and characterization of the influence lubrication during hot deformation in AISI 430 ferritic stainless steel in a Steckel mill process. A characterization of industrial process AISI 430 thermo mechanical cycle simulation from slab reheating until finish annealed coil has been presented. A microstructure and texture characterization has been provided for pilot hot strip rolled and microstructure, texture, mechanical and hoping tests for pilot cold strip rolled after finish annealed process. The quantification of presents phases (recrystallised and non-recrystallised

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13

Carvalho, Marcilio Dias de. "Correlação das microestruturas de amostras de dolomitas do quadrilátero ferrífero, MG com as temperaturas iniciais de hidratação das dolomas." Universidade Federal de Minas Gerais, 2005. http://hdl.handle.net/1843/MAPO-7RELWW.

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The slag agressivity during steel making in basic oxygen furnace (BOF) process has been attributed to its capacity of dissolving different refractories components, especially MgO (magnesia). Adding magnesia as dolomitic limestone, dolomitic lime has allowed the reduction of refractories attacks by corrosion, as long as raw materials presenting enough reactions rates are used. Several reviews already edited about the theme have permitted foreseeing of conditons of wearing, as well as the mettalurgical reactions wich have to be controlled increase to the life of the refractories. This document p

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14

Lopes, Hilton Luis Pereira. "Modelo para previsão da condição térmica de panelas de aciaria." Universidade Federal de Minas Gerais, 2007. http://hdl.handle.net/1843/MAPO-7QJPPA.

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Temperature control during the whole steelmaking process has a greatimportance to achieve the quality and productivity requirements demanded nowadays.At Gerdau Açominas steelplant, the temperature control of liquid steel from tapping up to the solidification in the caster has been widely studied. Due to the long casting times, a lack of control of the steel temperature, frequently, causes interruptions in the casting process, leading to productivity and yield losses.In the present work, a model to predict the thermal condition of the steel ladles was proposed, in order to reduce the temperatur

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Junior, Ezequiel de Souza Costa. "Desenvolvimento de matriz de quitosana/PVA, quimicamente reticulado para aplicação potencial em engenharia de tecido epitelial." Universidade Federal de Minas Gerais, 2008. http://hdl.handle.net/1843/MAPO-7REJZY.

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The skin is the organ of corporal covering that exercises the function of body boundary, between the body and the environment, therefore have functions as interface body/environment. That role requires both specific and much complex transition functions of the organ, and is subject to various kinds of demands and wounds provoked by agents from different sources, such as, electromagnetic, chemical, mechanical, physical, etc. and the countless combinations between them. However the skin presents a capacity of considerable self-repairing. Those characteristics of the skin have prompted countless

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Canaan, Gustavo Levy. "Influência da adição de vanádio nas propriedades mecânicas de aços médio teor de carbono para beneficiamento." Universidade Federal de Minas Gerais, 2007. http://hdl.handle.net/1843/MAPO-7R5Q4B.

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This work contributes to the understanding of the variation in the mechanical properties in all processes of the suspension springs production if the steel chemical composition have been modified. It studied the change in the chemical composition of high carbonsteel alloyed with Cr and Si through the vanadium addition working as a microalloying element. These processes include the wire rod production, the drawn bar fabrication and the suspension spring coiling in the quenched and tempered condition. This work evaluated the better conditions of the tempering treatment for this steel withmodifie

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Filho, Olney Amorim Viana. "Estudo para o uso de matérias-primas nacionais em misturas de carvões para obtenção de coque com características requeridas em altos-fornos de alta produtividade." Universidade Federal de Minas Gerais, 2007. http://hdl.handle.net/1843/MAPO-7RCHR7.

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This study has the objective of exploring the possibility of utilizing alternative raw materials available in the country in the coal blends with high quality coals for producing high quality coke for the blast furnaces of Gerdau Acominas, Ouro Branco, Brasil.Characterization of the constituents of the blends (Low grade coal from Santa Catarina, Petroleum coke from REGAP Petrobras) has been carried out.Different blends were prepared with different percentages of the above with high grade coal were prepared and charged into the pilot furnace (carbolite furnace) of the Gerdau, Acominas and the c

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Fernandes, Eunirio Zanetti. "Caracterização física, química, mineralógica e metalúrgica dos produtos granulados de minério de ferro." Universidade Federal de Minas Gerais, 2008. http://hdl.handle.net/1843/MAPO-7REJRR.

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The main purpose of this thesis is the technological characterization of iron ores granulated products (lump ores), through of study of chemical and physical correlations, typologies, metallurgical behavior and mineralogy of eleven from Vales South System mines. In terms of granulometric distribution, the majors percentages are concentrated between fractions 31,50 to 12,50 mm. The most important chemical correlations are: alumina and loss of ignition; manganese an magnesium; calcium and magnesium; manganese and calcium, alumina and phosphorus and the main negative correlations are: iron total

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Abreu, Carolina Bittencourt de. "Tratamento hidrometalúrgico do resíduo da rota de processamento de zinco primário para a recuperação de sulfato de cálcio visando aplicação industrial." Universidade Federal de Minas Gerais, 2009. http://hdl.handle.net/1843/MAPO-7RLKHH.

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Many non-ferrous metals ore, such as zinc, are associated with toxic elements, which are implied in the toxicity increase of its residues generated on process. At the primary zinc processing unit of the Votorantim Metals, at Três Marias (MG) (VM-Zn-TM),sodium sulfide (Na2S) and calcium oxide (CaO) are added in the final polishing stage ofthe effluents. This master degree dissertation presents the experimental results for the sulfuric acid leaching of CaSO4 contained in the residue sample and subsequent recovery of this chemical specie. Species like Na2S and CaO are added to precipitate remaini

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Martins, Lemyr. "Estudo da flotação de minério silicatado de zinco sem a etapa de deslamagem." Universidade Federal de Minas Gerais, 2007. http://hdl.handle.net/1843/MAPO-7R7GCU.

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The world measured reserves of zinc reached, in 2005, 462 x 106 t of the metal, the Brazilian reserves representing 1.2% of the world reserves. Approximately 82.9% of the Brazilian reserves are located in Vazante and Paracatu, in the northwest of Minas Gerais state. The ore from the Vazante deposit is oxidized. The apparent consumption of zinc concentrate in Brazil reached 592 x 103 t in 2005. The increase in sales of zinc in the coming years is estimated in 4% per year. Aiming at increasing the grade and recovery of the zinc concentrate produced in Vazante, the investigation included mineralo

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Azevedo, Juliana Calabria. "Arquitetura de interfaces funcionais em argilas e adobes." Universidade Federal de Minas Gerais, 2008. http://hdl.handle.net/1843/MAPO-7RELNJ.

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Clay is a widely used and studied material in many scientific areas. It can be called mud and it also can be used in advanced applications such as the pharmaceutical industry composites, special adsorbents etc. Adobe is basically composed of clay and it retains some of its morphological characteristics and functions. It was possible in this work to develop surface modifications for adobe which made the architecture of the adobe surface functional and capable of adapting to different environments and solicitations. Characteristics were studied in order to add technical features to the adobe bri

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Vieira, Marcos Gomes. "Produção de um pellet feed a partir da concentração do rejeito da flotação mecânica da SAMARCO." Universidade Federal de Minas Gerais, 2008. http://hdl.handle.net/1843/MAPO-7R7GM9.

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This work investigated the possibility to produce a pellet feed with 1.0% of silica using a representative sample of the mechanical flotation tailings. This sample contained 11.0% Iron and presented a F80 and a d50 of 116µm and 63µm, respectively. Higher silica content was verified in the coarser fractions and larger iron content in the fraction -37µm. The specular hematite is the most abundant mineralogical phase in fraction -37µm. The technological tests involved four routes: magnetic concentration using Minimag (WHIMS), magnetic concentration using SLon, reverse flotation and direct flotati

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Figueiredo, Rubem Lucas Pena de. "Soldagem térmica de tecido biológico rico em colágeno (aorta porcina)." Universidade Federal de Minas Gerais, 2009. http://hdl.handle.net/1843/MAPO-7RSNXT.

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Cardiac valve bioprosthesis are manufactured by means of sutures, which brings some disadvantages, as the difficulty of creating an automated process and the stress concentration in the tissue suturing region. Tissue welding is a technique that can replace the suture. Studies were carried out with the purpose to assess the feasibility of applying the thermal welding in the biological tissue used in the bioprosthesis, evaluating its mechanical strength and understanding the mechanisms involved in the process. The experiments involved the direct application of heat in the tissue to be welded. In

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Sadahira, Carolina Mieko. "Síntese, caracterização e avaliação do perfil de liberação "in vitro" de hidrogéis do álcool polivinílico ph sensitivos processados por métodos físico-químico." Universidade Federal de Minas Gerais, 2007. http://hdl.handle.net/1843/MAPO-7R5NPN.

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In this study hydrogels of poly(vinyl alcohol) (PVA) processed by chemical method and gamma radiation were obtained in order to evaluate the pH responsive behaviour of those systems as well the utilization for the targeted drug delivery in the gastrointestinal tract of Human. The rheological properties of PVA solutions with different hydrolysis degree and weight mass were evaluated as well your chemical structure through infrared and ultraviolet spectroscopy. The crosslinking was made with glutaraldehyde and citric acid/gamma radiation. The hydrogels were analyzed on the effectiveness of the c

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Silvestre, Marcelo Oliveira. "Estudo do estado de dispersão das partículas em polpa de minério sulfetado de chumbo-zinco." Universidade Federal de Minas Gerais, 2007. http://hdl.handle.net/1843/MAPO-76DNQE.

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Votorantim Metais Zinco, a fully Brazilian company, belonging to the Votorantim group, is the only producer of zinc and lead in the country. The industrial operations are located in the state of Minas Gerais, divided in two mining enterprises, in Vazante and Paracatu, and two metallurgical plants, in Três Marias and Juiz de Fora. The ore from the Paracatu deposit contains lead and zinc sulphides, galena and sphalerite, respectively. The ore is extracted from an underground mine and sent to the concentrator to be processed in a sequence that involves crushing, grinding, lead flotation, zinc flo

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Marques, Rodrigo Jose Alves. "Avaliação da resistência à corrosão de aços IF revestidos com zinco e ligas de zinco-ferro destinados à industria automobilística." Universidade Federal de Minas Gerais, 2008. http://hdl.handle.net/1843/MAPO-7RCNQM.

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One of the most important changes in the last twenty years regarding steel application as a structural element, was the use of zinc and zinc-iron steel coated products for situations which require a major corrosion resistance. The consumer and competitor pressures responsible for the upsurge in the use of galvanized steel, which was experienced in the 1980s, have already been referred to. A further factor, which contributed to this, however, was the coincident uplift in the quality of the coated products. A much wider range of galvanized sheet products now became available from technologically

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Martins, Renata de Castro. "Características físicas, estruturais e mecânicas de instrumentos endodônticos de NiTi ProTaper." Universidade Federal de Minas Gerais, 2008. http://hdl.handle.net/1843/MAPO-7REMS5.

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A study on the structural, physical and mechanical characteristics of ProTaper nickeltitanium endodontic instruments was performed in this work. The geometric and dimensional aspects of the instruments were analyzed by optical microscopy. Simulated resin curved canals prepared with the instruments were evaluated using an image analysis software in order to verify canal geometry. Surface topography of the instruments was observed by scanning electron microscopy (SEM), their chemical composition was analyzed semi-quantitatively by X-ray energy dispersive spectroscopy (EDS), and the phases presen

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Januzzi, Aercio. "Análise da aglomeração a frio no processo HPS (Hybrid Pelletized Sínter) com ênfase nas matérias-primas envolvidas." Universidade Federal de Minas Gerais, 2008. http://hdl.handle.net/1843/MAPO-7R5JAP.

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ArcelorMittal Monlevade Steel works was motivated to study HPS (Hybrid Pelletized Sinter) process due to the similarity between the mix of iron ore from NKK Co and the natural fine iron ore from Andrade Mine owned by ArcelorMittal. The study began in the year 2000 and in the first quarter of 2002 the new plant facilities have started up with 100% of the Andrade sinter-feed (fine sinter-feed). Different characteristics in rawmaterials have introduced distortions in the original HPS technology in the Monlevade sinter plant. The fuel coating step of the original HPS could not be achieved in Monle

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Barroso, Rodrigo Camargos. "Redução do teor de cinzas dos finos de carvão vegetal por concentração gravítica a seco." Universidade Federal de Minas Gerais, 2007. http://hdl.handle.net/1843/MAPO-7RCNKC.

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The ashes, or more especifically the impurities, of charcoal are harmful to the production of pig iron, causing higher charcoal consumption, larger slag volume and increased costs. The elimination or minimization of the ashes content is imperative. The reduction of impurities was performed based on the differential properties identified from the technological characterization of the charcoal fines. The selected options were screening and the use of the pneumatic classifier developed by V&M Brasil and EEUFMG. The results indicated that the performance of screening (34% of impurities reduction w

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Ferreira, Angela de Mello. "Materiais híbridos nanoestruturados sintetizados a partir da funcionalização de esmectitas para imobilização de espécies inorgânicas e orgânicas." Universidade Federal de Minas Gerais, 2007. http://hdl.handle.net/1843/MAPO-7REHM3.

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The present work was aimed at synthesizing nanostructured hybrid materials derived from the functionalization of smectite clays with ligands containing thiol (-SH) and amino (-NH2) groups for application in adsorption processes. Two montmorillonite samples (a commercial American clay-Cloisite-Na and an in nature Brazilian clay from Campina Grande, PB) and one synthetic, commercial clay (Laponite) were investigated. The modification routes were based on the grafting reaction between hydroxyl groups present on clay surface and the hydrolyzable alkoxy group of the (3-mercaptopropyl)trimethoxysila

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Braganca, Ana Cristina Calil Ramos. "Avaliação de reagentes alternativos para substituição da cal em sistema de bombeamento de longa distância de polpa de minério de ferro." Universidade Federal de Minas Gerais, 2008. http://hdl.handle.net/1843/MAPO-7R5LBR.

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Two great concerns related to long-distance slurry pumping systems are plug formation, i.e. blockage, and sediment compaction upon shutdown. These problems are avoided in the Samarco Pipeline by adding lime. However, the presence of calcium ions generates scaling in the storage tanks of the concentrate pumping system and in the process water pumping system in the pelletizing unit. Moreover, the filter media is degraded in the subsequent process. Some alternative reagents were tested with the objective of evaluating the possibility of lime substitution as a transport reagent. Two organic coagul

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Feijo, Fernanda Diamantino. "Redução das perdas de zinco associadas aos processos de purificação do licor por cementação e de tratamento dos resíduos gerados da Votorantim Metais." Universidade Federal de Minas Gerais, 2007. http://hdl.handle.net/1843/MAPO-7RLK2K.

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The present work aims at reducing the losses of zinc associated to the processes of "purification of the zinc sulfate solution by cementation" and "treatment of the cementation residues", in the Três Marias plant of the Votorantim Metals Zinc, MG. The generation of the residues,approximately 300t/month imply in a reduction of the overall zinc recovery of the plant in 0,50-0,60%. In addition to these losses, the generation of the ementationresidues results in important environmental liabilities, and in significant disposal costs. The present work involved two stages of investigation. The first

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Mapa, Paulo Sergio. "Rota de processo para o underflow da deslamagem de minério de ferro do concentrador da Samarco Mineração." Universidade Federal de Minas Gerais, 2006. http://hdl.handle.net/1843/MAPO-7RCHYY.

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The iron ore reverse cationic flotation process, using etheramine as a collector/frothing and corn starch as a depressor, is very important in all major Brazilian pellet-feed concentration plants. One of the major challenges found by these plants is the metallic recovery increase, whose main factor is the reduction of iron minerals loss on the froth or true flotation. The main purposes of this study were the characterization of the two products proceeding from the desliming circuit (cleaner hydrocyclones underflow and desliming hydrocyclones underflow) that constitute the reverse cationic flot

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Carvalhido, Carlos Augusto. "Influência da deformação na laminação de encruamento nas propriedades mecânicas do aço acalmado ao alumínio refosforado, galvanizado a quente classe 220mpa de limite de escoamento." Universidade Federal de Minas Gerais, 2007. http://hdl.handle.net/1843/MAPO-77KNK6.

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Votorantim Metais Zinco, a fully Brazilian company, belonging to the Votorantim group, is the only producer of zinc and lead in the country. The industrial operations are located in the state of Minas Gerais, divided in two mining enterprises, in Vazante and Paracatu, and two metallurgical plants, in Três Marias and Juiz de Fora. The ore from the Paracatu deposit contains lead and zinc sulphides, galena and sphalerite, respectively. The ore is extracted from an underground mine and sent to the concentrator to be processed in a sequence that involves crushing, grinding, lead flotation, zinc flo

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Guimaraes, Octavio Rosa de Almeida. "Aplicação de algoritmos genéticos na determinação de cava final e sequenciamento de lavra em minas a céu aberto." Universidade Federal de Minas Gerais, 2007. http://hdl.handle.net/1843/MAPO-77KNW9.

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Esta dissertação de mestrado intitulada Aplicação de algoritmos genéticos na determinação de cava final e sequenciamento de lavra em minas a céu aberto sumariza o programa de trabalho a ser submetido ao Curso de Pós Graduação em Engenharia de Metalúrgica e de Minas (CPGEM UFMG) em conformidade com os requisitos para dissertação de Mestrado. Os tópicos descritos baseiam-se em desenvolvimentos e técnicas divulgadas, e têm por objetivo avaliar a aplicabilidade dos algoritmos genéticos no problema de definição de cava final e sequenciamento de lavra para minas a céu aberto. O objetivo é desenvolve

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Oliveira, Eduardo Marques de. "Avaliação da influência do tempo de estocagem em pilhas na qualidade de carvões metalúrgicos." Universidade Federal de Minas Gerais, 2008. http://hdl.handle.net/1843/MAPO-7R5P3K.

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The quality of coal used in the mix for production of coke used in blast furnaces is important for obtainment of a coke within characteristics demanded. Maintain the coke quality without great variations will enable a stable operation of the blast furnace.The objectives of this study were to evaluate the variations in metallurgical coals used for production of coke for blast furnace during stockpiling and to evaluate the influence of origin, volatile matter and climate factors on the characteristics of coals duringstockpiling .The experimental program for this study involved the formation of l

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Fernandes, Eunirio Zanetti. "Aplicação da caracterização tipológica ao planejamento de lavra de minério de ferro." Universidade Federal de Minas Gerais, 2003. http://hdl.handle.net/1843/MAPO-7R5PFG.

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Em 1994, a MBR - Minerações Brasileiras Reunidas S. A., iniciou um longo processo de substituição das Minas de Águas Claras e Mutuca, expandindo as atividades de mineração e beneficiamento no Complexo Pico, onde foi construída uma nova Instalação de Tratamento de minérios (ITM-D), no município de Itabirito, Estado de Minas Gerais.O projeto concebeu a concentração dos finos (fração <0,15 mm) por flotação e nas frações mais grosseiras, os produtos eram gerados sem concentração, apenas britagem e peneiramento. Com a crescente demanda de produtos de minério de ferro e maiores exigências de qualida

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Junior, Willy Schuwarten. "Caracterização e modelagem matemática da fração recristalizada de ferrita no aço inoxidável ferrítico AISI 430 durante o processo de deformação a quente em laminador Steckel." Universidade Federal de Minas Gerais, 2007. http://hdl.handle.net/1843/MAPO-7RCN73.

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This work deals with the characterization and mathematical modeling of the ferritic recrystallised fraction in AISI 430 ferritic stainless steel during the hot deformation in a Steckel mill process. A characterization of the thermo mechanical cycle of AISI 430 industrial process from reheating of the plate to annealed coil in box has been presented.A mathematic model was developed in spreadsheet to predict the ferritic recrystallised fraction during the steel processing. At the same time, is shown the results of a physical simulation by hot torsion.The results obtained by both, mathematical mo

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Federman, Sonia Regina. "Recobrimento de aço inoxidável ABNT 409 empregando filme fino bioativo obtido via sol-gel." Universidade Federal de Minas Gerais, 2007. http://hdl.handle.net/1843/MAPO-7REN7E.

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In the present study, composites made up of ABNT 409 stainless steel was obtained where films produced according to the sol-gel route were deposited using the immersion method. A film of the binary system SiO2-CaO, and another one of the ternary system SiO2-CaOP2O5, were employed. The structure and properties of these films were characterized through the scanning electron microscopy (SEM) technique, coupled with the energy dispersive spectroscopy, atomic force microscopy, Fourier Transformed Infrared spectroscopy (FTIR), Raman spectroscopy, and glow discharge optical emission spectroscopy and

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Almeida, Debora Fernandes. "Gestão ambiental dos sedimentos de corrente do rio SãoFrancisco na região de Três Marias/ Minas Gerais." Universidade Federal de Minas Gerais, 2010. http://hdl.handle.net/1843/MAPO-88NQQC.

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The São Francisco River, in the region of Três Marias (Minas Gerais), is subject to multiple environmental impacts: hydroelectric generation, zinc metallurgy, domestic sludge discharge, agriculture, forestry, among others. This doctorate aimed to assess the environmental impact caused by metal contamination of bed sediments at the São Francisco River and one of its tributaries in the region of Três Marias (MG/ Brazil). The assessment was accomplished by using the weight-ofevidence- WOE approach. The studies developed to support the assessment included: (1) metal concentration (2) metal bioavai

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Assis, Alexandra Alves Rodrigues de. "Estudo de mycobacterium phlei (ATCC 11758) como agente agregante para hematita e quartzo." Universidade Federal de Minas Gerais, 2007. http://hdl.handle.net/1843/MAPO-7R5JQ7.

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Several microorganisms have been studied in flotation, sedimentation and filtration processes for several minerals, with positive results. Studies show Mycobacterium phlei as flocculant agent and potential collector for hematite. The objective of this work is to study the influence of the addition of the bacteria Mycobacterium phlei (ATCC 11758) upon sedimentation and filtration of the minerals hematite and quartz. The sample of hematite comes from Quadrilátero Ferrifero in Minas Gerais and has hematite (Fe2O3) as its main mineralogical phase. The quartz sample comes from the town Jaboticatuba

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Lage, Meire Guimaraes. "Microestrutura e deformação a quente de um aço dinx20cr13 na laminação de tubos sem costura." Universidade Federal de Minas Gerais, 2008. http://hdl.handle.net/1843/MAPO-7QJQAZ.

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The DIN X20Cr13 stainless steel is a high technological alloy usually used in oil industry for onshore and offshore tubing applications. In this study DIN X20Cr13 equilibrium diagrams were made by Thermo-Calc software to study transformation reactions in solid state phases. This stainless steel was submitted to different heat treatments in order to generate delta ferrite to characterize and quantify it. Hot torsion tests were made to study DIN X20Cr13 mechanical properties and softening kinetic. The results showed that polygonal delta ferrite was not built with quantity enough to damage DIN X2

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Falcucci, Andre. "A influência de floculantes poliméricos na formação de pastas minerais." Universidade Federal de Minas Gerais, 2007. http://hdl.handle.net/1843/MAPO-7R5LG5.

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In the last years, the disposal of tailings in the form of pastes or high-density slurries has gained importance as it may present significant advantages in comparison to more traditional disposal techniques. The knowledge of physical chemical characteristics of the material to be disposed, as well as the interactions that result from the use of polymeric flocculants on solid/liquid separation can lead to the formation of pastes and/or high-density slurries with adequate conditions for handling and final disposal.With the help of factorial design tool (22) and with pH and flocculant dosage as

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Oliveira, Marise de. "Desenvolvimento e caracterização de fosfato de cálcio fluoretado em esmalte dentário." Universidade Federal de Minas Gerais, 2007. http://hdl.handle.net/1843/MAPO-7REMA2.

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An alternative to etching enamel for retention of an adhesive and repair caries lesions on enamel is to grow crystals on the enamel surface. One new technique of crystals adhesion that uses a peroxide solution of hydrogen and phosphoric acid added to the dust of fluoride calcium phosphate (F-CaP), was applied to the surface of the enamel for the coating attainment. This procedure was made by eight times in the incremental technique of dental restorations. The thickness of the layer formed in the surface of the enamel was observed through the MEV images and measured 62µm, in average. The coatin

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Alvarenga, Evandro de Azevedo. "Influência do substrato metálico e da camada de zinco na resistência à corrosão de aços eletrogalvanizados fosfatizados e pintados." Universidade Federal de Minas Gerais, 2007. http://hdl.handle.net/1843/MAPO-7REJWV.

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The automobile industry has used electrogalvanized steels sheet with zinc layer masses varying from 50 g/m² to 60 g/m² for the manufacture of its products,which is generally not very problematic from the point of view of atmospheric corrosion resistance. However, nowadays some car makers use electrogalvanized steels with zinc layer mass equal to or even less than 40 g/m², which is concerning because a too low zinc layer mass do not satisfactorily protect the steel against corrosion.Thus this study was proposed in order to investigate the influence of the zinclayer mass on the corrosion resista

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Fernandes, Mauro Vivaldino. "Efeito do tipo de carvão injetado nas ventaneiras do alto-forno no consumo de combustíveis (Fuel-Rate)." Universidade Federal de Minas Gerais, 2007. http://hdl.handle.net/1843/MAPO-7R7GX8.

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Coal injection through of the blast furnaces tuyeres is one of the ways to reduce coke consumption and dependence in the blast furnace process in addition to lowering of cost of production of pig iron. There are increasing trends in achieving high substitution rates of coke through increased rates of coal injection and productivity. This topic hasbeen a great technological challenge and involves different aspects such as coal blending and characterization of blended mixtures and their influence on fuel replacement ratio and achieving process stability, high productivity and reduction in costs.

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Bastos, Savia Cristina Lacerda Poubel. "Caracterização estrutural do nitreto de ferro silício e avaliação de sua aplicação como matéria-prima para massa de tamponamento." Universidade Federal de Minas Gerais, 2007. http://hdl.handle.net/1843/MAPO-7RCJHX.

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The iron silicon nitride is a kind of composite obtained through nitretation of the iron silicon, the temperature and controlled pressure. Still little studied this material have some applications, where in this work is stressed the use of this as one of the raw materials in the taphole mud to blast furnace. We carried out a study about physical, chemical and microstructural characterizations of the iron silicon nitride and, evaluation of its influence when added to the taphole mud. The iron silicon nitride samples studied presented significant difference during morphology and particles size c

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Rojas, Carol Elizabeth Barrientos. "Reciclagem de sucata de jóias para a recuperação hidrometalúrgica de ouro e prata." Universidade Federal de Minas Gerais, 2009. http://hdl.handle.net/1843/MAPO-7QJP4W.

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A great amount of scrap metal wastes away in the manufacturing of gold jewelry, which due the lack of knowledge of precious metals recovery used in its manufacturing. A part of this scrap material is considered as a high-grade scrap of gold, silver and platinum metals. In this Master degree Thesis it has been evaluated the use of a hydrometallurgical methodology to treat scrap gold jewels. The methodology consisted of an initial leaching of samples with proportions higher (sample A) and lower than 10% Ag (sample B) with HNO3 to extract silver, followed by aqua regia leaching to extract gold fr

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Maia, Breno Totti. "Efeito da configuração do bico da lança na interação jato-banho metálico em convertedor LD." Universidade Federal de Minas Gerais, 2007. http://hdl.handle.net/1843/MAPO-7R5MTZ.

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Different technologies and new devices have been incorporated into BOF converters to increase their productivity in order to face the demand for steel production.Gerdau Barão de Cocais Steelplant also introduced new techniques and technologies into its BOF converter. These improvements led to a increase in the capacity of the BOF converter from 18 to 30 tons of liquid steel per heat, with the same basic lay-out.Despite this significant increase, Gerdau Barão de Cocais is still looking for new developments that could lead to further increases in the productivity of its BOF converter. The produc

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Akaki, Emilio. "Avaliação de incorporação de agentes antibacterianos a cimentos resinosos." Universidade Federal de Minas Gerais, 2005. http://hdl.handle.net/1843/MAPO-7REJHN.

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As restaurações indiretas odontológicas têm sido cada vez mais solicitadas pelos pacientes no consultório odontológico. Tais restaurações têm uma longevidade menor do que as tradicionais restaurações metálicas. Uma das maneiras de se aumentar a sua durabilidade seria incorporar agentes antibacterianos aos cimentos resinosos. Neste trabalho iniciamos os estudos nesta linha de pesquisa adicionando o triclosan (Irgasan DP-300, Ciba-Geigy ) e o diacetato de clorexidina (Sigma ) em diferentes proporções (1 a 3% p/p) em duas marcas comerciais (C&B - Bisco e Fill Magic Dual Cement Vigodent ) de cimen

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