Introdução: Durante o processo de implantação de cursos na modalidade a distância, a etapa de planejamento e gerenciamento do curso é um dos temas que vem ocupando as discussões dos envolvidos na projeção e execução das propostas educacionais, muitas vezes com finalidades que excedem o nível do educacional e esbarram também em questões de cunho administrativo e econômico. O fato de que, na Educação a Distância (EAD), se está lidando com sujeitos e instituições de características diversas assim como tecnologias das mais sofisticadas, não tem assegurado igual avanço nos modelos pedagógicos do ensino, e menos ainda, na qualidade da gestão desses projetos. Objetivo: Desenvolver um projeto educacional a distância através das ferramentas de gestão existentes no Guia Project Management Body of Knowledge (PMBOK). Método: O estudo constituiu-se de uma pesquisa aplicada, de produção tecnológica com análise exploratório-descritiva. Quanto a técnica, foi empregado o estudo de caso de análise documental. Resultados: Neste projeto foram consideradas a existência de 5 fases do ciclo de vida que fundamentam o modelo do processo de gerenciamento de projetos, abrangendo todo percurso desde a concepção ao encerramento, identificadas por Inicialização, Planejamento, Execução, Monitoramento e Controle, Encerramento. Para inclusão das diretrizes em consonância com as orientações do Guia PMBOK, as 10 áreas de conhecimento foram selecionadas pela equipe do projeto, uma vez que elas englobam todas as ações gerenciais de um curso a distância, todavia, de acordo com o perfil do projeto, utilizou-se somente parte destes processos. A integração exerceu papel essencial no gerenciamento do curso, à medida que, criou condições propícias para o desenvolvimento do projeto através do estabelecimento do objetivo de capacitar profissionais no uso de Tecnologias Digitais de Informação e Comunicação como recursos pedagógicos através da EAD baseando-se na aprendizagem significativa, no uso da metodologia dialética e das metodologias ativas, vinculadas a mediação da aprendizagem na era digital. Conclusões: Cada área de conhecimento do Guia PMBOK teve em seus processos a organização de acordo com as demandas e conhecimentos do projeto e dos gestores, com ênfase no planejamento educacional. O detalhamento conceitual e operacional foi analisado de forma a orientar os aspectos essenciais para o planejamento de um projeto em EAD dentro de um contexto gerencial norteada pelo modelo das boas práticas em gestão de projetos. O planejamento por unidades de aprendizagem, o monitoramento, o controle e os critérios de qualidade estabelecidos foram fundamentais para as tomadas de decisão no gerenciamento. O estabelecimento das atividades predominantes do projeto educacional e sua finalidade principal fizeram que os produtos fossem desenvolvidos dentro do que era almejado pelos stakeholders, sendo benquistos sem qualquer restrição. / Introduction: During the process of implementation of Education Distance Learning (EDL), the planning stage and management of the course is one of the themes that has been occupying the discussions of those involved in designing and implementing educational proposals, often for purposes that exceed the educational level and also run into administrative and economic nature issues. The fact that, in distance education, you\'re dealing with subjects and different characteristics of institutions as well as the most sophisticated technologies, has not ensured equal advance in pedagogical teaching models, and even less in quality management. Objective: To develop an educational project in the distance through the existing management tools in the Project Management Body of Knowledge Guide (PMBOK). Method: The study consisted of an applied research, production technology with exploratory and descriptive analysis. As for technique, we used the case study of document analysis. Results: In this project we considered the existence of 5 phases of the life cycle that base the model of the process of project management, covering all path from conception to closure, identified by Initialization, Planning, Execution, Monitoring and Control, Finalization. In accordance with the guidelines of the PMBOK Guide, the 10 areas of knowledge were selected by the project team, since they encompass all managerial actions of a distance course, however, according to the project profile, only part of these processes were used. Integration has played an essential role in the management of the course, as it has created favorable conditions for the development of the project through the establishment of the objective of training professionals in the use of Digital Information and Communication Technologies as pedagogical resources through distance education based in meaningful learning, in the use of dialectical methodology and active methodologies, linked to the mediation of learning in the digital epoch. Conclusions: Each PMBOK Guide Knowledge area had in its processes the organization according to the demands and knowledge of the design and management, with an emphasis on educational planning. The conceptual and operational details was analyzed in order to guide the essentials for planning a project in distance education in a managerial context guided by the model of good practice in project management. Planning for learning units, monitoring, control and quality criteria were essential for decision-making in management. The establishment of the predominant activities of the educational project and its main purpose made that the products were developed within what was desired by the stakeholders, being well liked without any restriction.

Made available in DSpace on 2016-04-28T18:23:29Z (GMT). No. of bitstreams: 1 tese.pdf: 897004 bytes, checksum: 01569f30a7a9bd0feb6b20e5db201c73 (MD5) Previous issue date: 2005-05-05 / This research, part of the DIRECT Project (LAEL/PUC-SP), aims at analyzing the characteristics of city tour and museum guides in two different sociocultural contexts: Brazil and Spain. In this way, it investigates the cultural context and the situational context of the corpora of this study. The theory focuses on Systemic Functional Grammar (Halliday, 1994). Although this grammar offers various elements that could also reveal characteristics in the discourse of these professionals, Theme was chosen because it makes possible the study of the organization of the message, the point of departure the speaker selects for grounding what he is going to say (Halliday (1994: 34). Besides, it is possible to compare how two different languages and cultures organize their message. This research has three goals: (1) to identify similarities and differences in the discourse of city tour and museum guides; (2) to identify similarities and differences in the discourse of Brazilian and Spanish city tour and museum guides; (3) to establish if there is one or two genres according to the general structure of the discourses and to Thematic options. Thus, this study is composed of 04 corpora: one of visits to two Brazilian museums; one of visits to two Spanish museums; one of two city tours in Brazil; one of two city tours in Spain. The visits were recorded in cassette tapes and transcribed. The theory about genre follows the ideas of Hasan (1989), Swales (1990), Bathia (1993), Fries (1995), Eggins & Martin (1997) and Ramm (2000). The Theme was studied through the ideas of Halliday (1994), Eggins (1994), Berry (1995), Thompson (1996), Barbara & Gouveia (2001) and Gouveia & Barbara (2001). Results show that city tour and museum guides organize their discourse in a very similar way and that there are some idiosyncratic differences, what is expected as the study deals with two sociocultural contexts / Esta pesquisa, parte do Projeto DIRECT (LAEL/PUC-SP), tem o objetivo de analisar as características do discurso de guias de turismo e monitores de museus em dois contextos sócio-culturais diferentes: Brasil e Espanha. Investiga-se, portanto, o contexto de cultura e o contexto de situação que envolvem os corpora aqui tratados. A base teórica do trabalho está na Gramática Sistêmico-Funcional (Halliday, 1994). Embora esta gramática ofereça vários elementos que também poderiam ressaltar características no discurso dos guias e monitores, escolheu-se o Tema por permitir que se estude a organização da mensagem, o ponto de partida que o produtor do texto, aqui o guia e o monitor, seleciona para embasar o que vai dizer. Além disso, é possível fazer uma comparação na forma como essa organização do discurso é feita em duas línguas e culturas diversas. A análise tem três objetivos: (1) identificar as semelhanças e diferenças do discurso de guias de turismo e monitores de museus; (2) identificar as semelhanças e diferenças do discurso de guias e monitores brasileiros e espanhóis; (3) estabelecer, através da análise da estrutura geral dos discursos e das escolhas Temáticas, se há um ou dois gêneros. Para tanto, a pesquisa está composta por 04 corpora: um de visitas realizadas a dois museus brasileiros; um de visitas realizadas a dois museus espanhóis; um de dois city tours realizados no Brasil; um de dois city tours realizados na Espanha. A coleta dos dados foi feita através de gravação das visitas em fita cassete e sua posterior transcrição. A teoria sobre gênero segue as idéias de Hasan (1989), Swales (1990), Bathia (1993), Fries (1995), Eggins & Martin (1997) e Ramm (2000), e a de Tema, Halliday (1994), Eggins (1994), Berry (1995), Thompson (1996), Barbara e Gouveia (2001) e Gouveia e Barbara (2001). Os resultados da pesquisa mostram que os guias e monitores organizam seu discurso de forma muito semelhante e que as diferenças entre o Brasil e a Espanha são poucas e idiossincráticas, já que são contextos sócio-culturais e línguas diferentes

Settling time is very important for data acquisition systems because it is the primary factor that defines the data rate for a given error level. Therefore settling time measurement is a crucial test. The goal of the project was to design, test and compare different measurement techniques. Three methods were tested to the accuracies of 0.1% and 0.01%. Also simulations were conducted to explain the parameters that affect the settling behavior. Additionally bench measurements were correlated to simulation results. This report is intended as a guide for settling time measurements.

Doctor of Philosophy / Department of Civil Engineering / Mustaque A. Hossain / Stacey E. Kulesza / Recycled concrete aggregate (RCA) is the byproduct of the demolition of concrete structures and pavements. An estimated 140 million tons of concrete waste is produced annually in the United States, most of which ends up in landfills. The use of RCA to replace quarried aggregates in paving projects is one way to utilize these materials and alleviate concerns regarding this increasing waste stream. RCA usage prevents waste concrete disposal into landfills, resulting in more sustainable use of mineral aggregate sources, and may further reduce costs associated with paving projects. However, the inferior physical properties of RCA, such as the presence of recycled mortar, complicate the incorporation of RCA into new concrete mixtures. State highway agencies such as the Kansas Department of Transportation are facing further issues with RCA from D-cracked pavements, raising the question if D-cracked aggregates should be used in paving operations. No known work has evaluated the effect of RCA from D-cracked pavements in subgrade soil stabilization. This study stabilized a low-plasticity clay in Kansas using RCA and three stabilizing materials (lime, Class C fly ash, and a combination of Portland cement and fly ash). Candidate mixtures with varying proportions of chemical stabilizers and D-cracked aggregates were evaluated using the standard Proctor, unconfined compressive strength, linear shrinkage, and California Bearing Ratio tests. Microstructure characteristics of selected mixtures were explored using scanning electron microscopy (SEM) and energy dispersive X-ray tests. Laboratory test results indicated that RCA, in conjunction with all cementitious materials except lime, improved clay strength, stiffness, and shrinkage properties. SEM results indicated that RCA caused a low void space and a dense arrangement of soil particles. RCA effectively improved evaluated mixture properties when an adequate soil-RCA bond was reached using chemical agents. The long-term performance of full-depth flexible pavements with stabilized mixtures as subgrade was assessed in the AASHTOWare Pavement ME Design (commonly known as MEPDG) software. The life-cycle cost of flexible pavements with stabilized mixtures was estimated for a 40-year design period. Economic analysis results indicated that RCA was cost effective only if it was used with a combination of fly ash and Portland cement.

Cette thèse est une contribution au domaine de recherche de la plasmonique nonlinéaire, domaine émergent de l'optique. L'objectif principal est de démontrer expérimentalement l'autofocalisation d'une onde plasmonique.L'étude débute avec la fabrication et la caractérisation de guides plans en verre de chalcogénure de composition Ge-Sb-Se. Une technique basée sur la formation de solitons spatiaux est développée afin d’estimer leurs non-linéarités Kerr. Les propriétés optiques linéaires et non linéaires de ces guides sont étudiées aux longueurs d’onde de 1200 nm et 1550 nm.Des structures plasmoniques sont ensuite conçues pour propager des ondes hybrides plasmon-solitons avec des pertes de propagation modérées. Elles sont constituées des guides précédents recouverts de nanocouches de silice et d'or.Les caractérisations optiques par couplage plasmon-soliton révèlent une forte autofocalisation subie par l’onde qui se propage à l'intérieur de la structure plasmonique. Comme prévu par la théorie, le comportement est présent uniquement pour une lumière polarisée TM. Des résultats expérimentaux détaillés de cette autofocalisation exaltée par effet plasmonique sont présentés pour différentes configurations. Des simulations confirment les résultats expérimentaux obtenus.Cette démonstration fondamentale vient confirmer le concept d’autofocalisation assistée par plasmon tout en révélant un effet nonlinéaire très efficace. Cela ouvre de nouvelles perspectives pour le développement de dispositifs photoniques non linéaires intégrés ainsi que de nouveaux phénomènes physiques. / This dissertation contributes to the research area of nonlinear plasmonics an emerging field of optics. The main goal is to demonstrate experimentally the spatial self-trapping of a plasmonic wave.The study begins with the fabrication and the characterization of slab Ge-Sb-Se chalcogenide waveguides. A technique based on the formation of spatial solitons is developed to estimate their Kerr nonlinearities. Linear and nonlinear optical properties of the waveguides are studied at the wavelengths of 1200 nm and 1550 nm.Plasmonic structures are then designed to propagate hybrid plasmon-soliton waves with moderate propagation losses. They are constituted of the previous waveguides covered with nanolayers of silica and gold.Optical characterizations reveal a giant self-focusing undergone by the wave that propagates inside the plasmonic structure. The behavior is present only for TM polarized light as expected from theory. Detailed experimental results of this plasmon enhanced nonlinear self-trapping corresponding to different configurations are presented. Simulations confirm the obtained experimental results.This fundamental demonstration confirms the concept of plasmon-assisted self-focusing while revealing a very efficient nonlinear effect. This opens new perspectives for the development of integrated nonlinear photonic devices as well as new physical phenomena.

Atualmente existe, praticamente, um consenso entre os pesquisadores de Ensino de Física, de que a metodologia tradicional não é a mais efetiva por não promover um real engajamento dos estudantes durante o processo de ensino/aprendizagem. Muitos pesquisadores denominam Aprendizagem Ativa (AA), os métodos que requerem tal engajamento e as pesquisas indicam que esta abordagem é mais efetiva. Ou seja, verifica-se um aumento da compreensão dos conceitos básicos de Física. Entretanto, ainda há pouca aplicação de novas metodologias em sala de aula, tanto no ensino médio quanto no superior. No nosso entender, as atividades experimentais (de laboratório ou demonstração) são as mais adequadas para a aplicação de metodologias de AA. Entretanto, particularmente no Brasil, existe pouco material didático experimental disponível que utilize essa metodologia. Este trabalho visa sanar tal necessidade no campo da Ótica Geométrica, oferecendo uma série de roteiros comentados para experimentos e demonstrações interativas. Estes roteiros usam a idéia de investigação orientada onde se pretende que os conhecimentos prévios dos alunos sejam expostos e confrontados com os conceitos científicos. Este material foi aplicado a estudantes do ensino médio (escolas públicas) e do curso de Licenciatura em Ciências Exatas do IFSC. Para a avaliação do mesmo foram realizados testes escritos e monitoramentos em sala de aula. / There is nowadays consensus among the physics education researchers that the traditional teaching methods are not the most effective in promoting real engagement of the students in the teaching/learning process. Several researchers named Active Learning (AL), methods that require this engagement and research evidences indicate that this approach is the most effective, a better comprehension of the basic physics concepts is verified. However, particularly in Brazil, there are few didactic materials available using AL approaches. This works aims to fulfill this need in the field of Geometrical Optics, offering a series of tutorials (guides) for experiments and interactive demonstrations. These tutorials are based in the idea of guided investigation where the students previous beliefs are exposed and confronted with the scientific concepts. This material was applied to high school students (in public schools) and college students (science teacher preparation course of IFSC). In order to evaluate this material, written tests were performed as well as observation of classrooms.

Ce travail de thèse présente une étude théorique, numérique et expérimentale de l’intégration sur un guide d’onde diélectrique de chaînes de nanoparticules d’or supportant des résonances « plasmon de surface localisé ». Les guides d’onde à plasmon de surface localisé procurent un confinement sub-longueur d’onde de la lumière, ce qui permet d’envisager la réalisation de composants optiques ultra-compacts. Cependant, leurs pertes optiques élevées restreignent leur application à de courtes distances de propagation, contrairement aux guides d’onde diélectriques. Une combinaison judicieuse des deux types de guide doit donc permettre de bénéficier de leurs avantages respectifs. Dans un premier temps, nous avons étudié théoriquement les propriétés des chaînes des nanoparticules grâce à un modèle analytique basé sur l’approximation de dipôles ponctuels couplés, que nous avons développé. Cette étude a permis de déterminer la forme et les dimensions des nanoparticules qui ont ensuite été introduites dans un logiciel de FDTD pour simuler le couplage entre la chaîne de nanoparticules et le guide diélectrique (SOI ou en Si3N4). De cette étude numérique, nous avons déduit les géométries des structures à fabriquer. Les structures réalisées ont été caractérisées à l’aide d’un banc de transmission résolue spectralement, mis en place pendant cette thèse, et d’un système de mesures en champ proche optique en collaboration avec le LNIO (Troyes). Pour la première fois, nous avons montré expérimentalement les propriétés d’une chaîne courte de nanoparticules intégrée sur un guide SOI, ainsi que le phénomène de guides couplés entre une chaîne longue de nanoparticules et un guide SOI. Une valeur record de la constante de couplage a été obtenue, et ce, aux longueurs d’onde des télécoms (proche infrarouge). L’énergie lumineuse transportée par le mode TE du guide SOI peut ainsi être entièrement transférée au guide plasmonique en 4 ou 5 nanoparticules, soit une distance de propagation de moins de 600 nm. Nous avons également étudié les propriétés de réseaux de Bragg à base de plasmon de surface localisé en confrontant les résultats de mesures de transmission résolue spectralement aux résultats théoriques d’un modèle analytique basé à la fois sur l’approximation de dipôle ponctuel en régime quasi-statique et la théorie des modes couplés. Ces travaux ouvrent la voie à des applications de pinces optiques, de capteurs ou de spaser, qui bénéficieront de l’intégration de nanoparticules métalliques dans les circuits photoniques. / This PhD work presents a theoretical, numerical and experimental study of the integration of a gold nanoparticle chain supporting "localized surface plasmon resonances" on a dielectric waveguide. The localized surface plasmon allows a sub-wavelength confinement of light which could lead to the achievement of ultra-compact optical components. However, the high level of optical losses restricts their application to short propagating distances unlike dielectric waveguides. A judicious combination of both types of guides should therefore allow taking profit of their respective advantages. Firstly, we have theoretically studied the properties of nanoparticles chains using an analytical model that we have developed following the coupled dipoles approximation. This has helped us to determine the shape and size of nanoparticles, which have been further used in a FDTD software, to simulate the coupling between the chain and the dielectric waveguide (SOI or Si3N4). Using this numerical study, we have deduced the geometries of structures to be fabricated. The realized structures have been characterized using a spectrally resolved transmission set-up, built during this thesis, and an optical near field measurement set-up (collaboration LNIO Troyes). For the first time, we have experimentally shown the properties of short nanoparticle chains integrated on a SOI waveguide as well as the existence of a coupled waveguide phenomenon between long nanoparticle chains and SOI waveguides. A record value has been obtained for the coupling constant at telecom wavelengths (near infrared). The light energy carried by the TE mode of the SOI waveguide can be completely transferred into the plasmonic waveguide via the first 4 or 5 nanoparticles of the chain, which means a distance of less than 600 nm. We have also studied the properties of Bragg gratings based on localized surface plasmon. Experimental results from spectrally resolved transmission measurements have been compared to theoretical results obtained from an analytical model based on the point dipole approximation in quasi-static regime, on one hand, and using the coupled mode theory, on the other hand. This work opens the way for applications to optical tweezers, sensors or spasers, which will benefit from the integration of metal nanoparticles in photonic circuits.

Dans la gamme de fréquence térahertz (THz), les sources et les détecteurs couramment utilisés en optique et en électronique présentent une chute de performances. Mon travail de thèse s’inscrit dans le cadre de la recherche de composants THz peu onéreux, compacts, accordables en fréquence et facile à intégrer. Le premier volet de mon travail de thèse concerne la détection THz et met à profit le couplage entre une onde incidente THz et des plasmons d’un gaz bidimensionnel d’électrons (2DEG) via des réseaux métalliques déposés au-dessus d’hétérostructures. Quatre puits quantiques à base de semi-conducteurs III/V(AlGaN/GaN, AlGaAs/GaAs, InAlN/GaN) et IV/IV (SiGe/Si/SiGe) ont été étudiés. Parmi les hétérostructures envisagées, celles réalisées à partir de matériaux III-N présentent les plus fortes résonances. Des mesures de spectre de transmission ont été effectuées avec un spectromètre à transformée de Fourier (FTIR) à température ambiante et cryogénique. Les modélisations numériques sont en bon accord avec les résultats expérimentaux. Une étude sur l’influence de la distribution homogène ou inhomogène du gaz d’électrons 2D est présentée. Le deuxième volet de la thèse concerne l’optimisation de la transmission THz. Les performances (dipsersions et les pertes) des guides d'onde planaires sont mal connues au THz. Nous avons choisi d’étudier des guides d’onde couramment utilisés en hyperfréquence. Dans un premier temps, la dispersion et les pertes (rayonnement, conduction et diélectrique) de lignes coplanaires (CPW) sur substrat polymère (BCB = benzocyclobutène) et substrat semiconducteur (InP) obtenues grâce à des modélisations numériques (Ansoft HFSS) entre 20 GHz et 1 THz sont présentées. Puis d’autres types de guides ont été envisagés tels que les lignes micro-ruban, à fente et triplaques sur substrat BCB avec HFSS et CST MWS. Leurs performances ont été comparées afin de dégager la structure la plus performante au THz. Des mesures entre 340 et 500 GHz ont pu aussi être réalisées pour les guides CPW. La comparaison avec les données numériques a montré un bon accord. / In the THz frequency gap between electronics and optics, the development of compact, tunable, less costly and room temperature operating sources, detectors, amplifiers and passive devices is growing. Electronic devices based on two dimensional (2D) plasmons in heterostructures open up the possibility of tunable emission and detection of THz radiation. For short distance THz transmission, the increased radiation loss as well as other types of loss (dielectric and ohmic loss) may handicap the applications of conventional planar waveguides well studied in the microwave band. Reevaluation of their propagation properties and comprehension of the physical nature of each kind of loss are necessary.This work is divided into two main sections. The first part deals with the optimization of THz resonant detection by quasi 2D plasmons-polaritons (PP) in the quantum wells (QW) among four heterostructures: III-V (AlGaN/GaN, InAlN/GaN, AlGaAs/GaAs) and IV-IV (SiGe/Si/SiGe). With the aid of metallic grating coupler, both ANSOFT HFSS and an indigenously developed program are used to investigate quantitatively the influences of structural parameters (grating period, metal strip width and thickness of barrier layer) and natural properties of 2D plasmons (electron concentration and mobility) on the PP resonances (frequency and amplitude) up to 5 THz. Transmission spectra of sample AlGaN/GaN have been measured by Fourier Transform Infrared Spectroscopy (FTIR) in 0.6-1.8 THz for various metal widths and at different temperatures to compare with the simulated results. At last, two types of modulated 2D electron gas in AlGaAs/GaAs are analyzed. One is the natural electron variation below and between metal fingers due to the difference between the barrier height at the interface metal/semiconductor and Fermi level pinning at the interface air/semiconductor. The other type is the forced modulated 2DEG by biasing voltage on metal fingers. These two parametric studies allow us to analyze and tune the frequency and amplitude of the THz detection. The second part separately studies the dispersions and attenuations of four waveguides (CPW, Microstrip, Stripline and Slotline) with the variation of geometric dimensions and properties of dielectric and metal by ANSOFT HFSS and CST MWS. Their performances are compared until 1 THz based on the same characteristic impedance. The advantages and the limitations of each waveguide are outlined and an optimal THz transmission line is proposed. Furthermore, preliminary measured attenuation of CPW in the frequency range 340-500 GHz are demonstrated and compared with numerical results. The design of transitions for adapting experimental probes by HFSS and the de-embedding method for extracting scattering and attenuation parameters of CPW by ADS are also presented..

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / Conselho Nacional de Desenvolvimento Científico e Tecnológico / A região de Itutinga foi alvo de estudos prospectivos por parte da empresa BP mineração na década de 80, onde foram encontradas mineralizações em lentes de sulfetos metálicos (Zn-Cu-Ag-Fe) associados a rochas komatiíticas peridotíticas e basaltos toleíticos (anfibolitos) do greenstone belts, nas proximidades da fazenda São Jerônimo, enquadrando-se em um depósito do tipo VMS. A partir destas informações encontradas na literatura propôs-se estudar a estaurolita, a magnetita e a ilmenita para, a partir da determinação do seu conteúdo em zinco, indicar a aplicabilidade destes três minerais como traçadores desses tipos de depósitos. Para isso foram coletadas amostras de sedimentos de corrente e concentrados de batéia na região próxima à ocorrência, no entorno da cidade de Itutinga, e também em uma região próxima a cidade de Itumirim, já que existem semelhanças litológicas entre as duas áreas. Os sedimentos de corrente, as frações magnéticas e as frações de 0,3A (separador eletromagnético Frantz) foram enviados para análises químicas por absorção atômica e ICP-OES. Os concentrados de batéia foram descritos, separando-se cristais de estaurolita de cada amostra coletada, e analisando-os em MEV-EDS para determinação da química mineral. Os resultados dos sedimentos de corrente apontaram que os pontos da fazenda São Jerônimo (ME-03, Itutinga 51,7 ppm de Zn) e o ponto do Ribeirão Santa Cruz, (ME-06, Itumirim 36,1 ppm de Zn) foram os que apresentaram melhores resultados, indicando anomalias em zinco nas duas áreas estudadas . As estaurolitas, retiradas dos concentrados de batéia de cada ponto estudado, foram divididas em três conjuntos, de acordo com os teores de ZnO encontrados: 1 - entre 2,96% e 3,25% de ZnO em peso; 2 - entre 2,03% e 2,76% de ZnO em peso; 3 - < 1,67% de ZnO em peso, sendo comparável com outras estaurolitas encontradas em diversos depósitos de Zn do mundo, como Dry River, Austrália e Palmeirópolis Goiás. Assim, as estaurolitas apresentam bons resultados como minerais indicadores na área estudada. Em relação as magnetitas e ilmenitas estudadas, o número de amostras coletadas no presente estudo foram muito pequenas para se ter informações conclusivas sobre o papel destes minerais como traçadores. Por outro lado, os resultados das análises químicas nos concentrados de ilmenita (até 856 ppm de Zn) e nos concentrados de magnetita (até 216 ppm de Zn), indicam a disponibilidade deste metal nas áreas estudadas. Assim, é possível se detectar a presença do zinco por dois meios: através de sedimentos de corrente, através de halos de dispersão química do elemento zinco, e através dos minerais resistatos (estaurolita zincífera, magnetita e ilmenita), a partir de uma dispersão clástica do grão. / The Itutinga region was studied for BP mineration in 80s , where they found sulphide mineralization in lenses (Zn-Cu-Ag-Fe) associated with komatiitic peridotite rocks and tholeitic basalts (amphibolites) of greenstone belts, near of Fazenda São Jerônimo. With this information in the literature the propose is study the staurolite, magnetite and ilmenite for indicating the applicability of these three minerals as tracers of these types of mineralization. For this, samples of stream sediment and panning concentrates in the region near the city of Itutinga, and also in a region near the city of Itumirim. The stream current, magnetic fractions and ilmenite fractions were sent to chemistry analyses (Atomic absorption and ICP-OES), and the panning concentrates were analyzed for the separating of staurolite crystals, and sent to SEM-EDS. The stream sediments results showed that the point of Fazenda São Jerônimo (ME-03, Itutinga 51,7 ppm of Zn) and the point of Ribeirão Santa Cruz (ME-06, Itumirim 36,1 ppm of Zn) were presented the best result. The staurolite of panning concentrates were divided into three groups according to levels of ZnO matched: 1 - between 2.96% and 3.25% by weight of ZnO, 2 - from 2, 03% and 2.76% by weight of ZnO, 3 - <1.67% ZnO by weight, comparable with other staurolite found in many zinc deposits in the world, such as Dry River, Australia and Palmeirópolis Goiás. Thus, the staurolite show good results as indicator minerals in the area. With respect to magnetite and ilmenite concentrates, the number of samples collected in both areas was too small to have conclusive information. On the other hand, the results of the chemical ilmenite (up to 856 ppm Zn) and magnetite (up to 216 ppm Zn), indicate the availability of this metal in the areas studied. Thus, it is possible to detect the presence of zinc by two means: through stream sediments through chemical dispersion halos of zinc, minerals and through resistive minerals (zincian staurolite, magnetite and ilmenite), from a crystal clastic dispersion.

A sustentabilidade, em sentido complexo, apresenta-se como um dos grandes desafios da humanidade, sendo a comunicação organizacional um lugar de sua construção e legitimação. Sob essa ótica, tendo como lente teórico-epistêmica, o Paradigma da Complexidade, conforme Morin (2006, 2008, 2011, 2013), com esta pesquisa temos o objetivo de compreender que perspectiva(s) teórico-filosófica(s) sobre sustentabilidade está(ão) orientando as práticas organizacionais na contemporaneidade. O tema do estudo são as apropriações da noção de sustentabilidade na/pela comunicação organizacional, especificamente, no âmbito da “organização comunicada” (BALDISSERA, 2009a), que é a dimensão das falas oficiais, lugar onde as organizações propõem imagens qualificadas de si na perspectiva do “ethos discursivo” (MAINGUENEAU, 2008). Nosso objeto de investigação são os sentidos de sustentabilidade produzidos e ofertados no discurso organizacional, especificamente, aquele materializado no Guia Exame de Sustentabilidade (GES) e nos sites institucionais de empresas premiadas pelo GES. Consideramos que esses são locais de instituição de sentidos, pois que se tratam de materializações discursivas orientadas pela intenção de comunicar e fazer reconhecer (instituir, conforme Bourdieu (1996)) determinados sentidos de sustentabilidade. No trajeto teórico-metodológico articulamos noções da Análise do Discurso, tendo como principais nortes as reflexões de Foucault (2006, 2012), Pêcheux ([88]2009), Orlandi (2009) e Maingueneau (1998, 2001, 2008, 2013). No processo de análise, acionamos, ainda, a sistematização proposta por Baldissera (2009b) sobre os lugares da sustentabilidade na cultura: 1) valor central; 2) valor periférico e/ou estratégico de mercado; 3) não-valor, valor negativo e/ou modismo; e 4) valor extrassistema. A análise dos sentidos de sustentabilidade instituídos no discurso organizacional nos permitiu compreender que a sustentabilidade tende a ser traduzida como sinônimo de lucratividade e perenidade dos negócios, com vistas à manutenção da lógica dominante, assumida, assim, como valor periférico e/ou estratégico de mercado na cultura organizacional. / Sustainability in complex sense, presents itself as one of the greatest challenges facing humanity, and organizational communication a place of its construction and legitimation. Under this view, with the theoretical and epistemic lens, the Paradigm of Complexity, according to Morin (2006, 2008, 2011, 2013), with this research we aim to understand what perspective (s) theoretical-philosophical (s) about sustainability is (are) guiding practices in contemporary organizations. The study of the subject are the appropriation of the concept of sustainability in / by organizational communication, specifically in the context of "communicated organization" (BALDISSERA, 2009a), which is the size of the official speeches, where organizations propose qualified pictures of themselves in perspective of "discursive ethos" (MAINGUENEAU, 2008). Our research object are produced sustainability senses and offered the organizational discourse, specifically, that materialized in the Exame Sustainability Guide (GES) and institutional sites of companies awarded by the GES. We believe that these are directions institution places, because that these are discursive materialization guided by the intention to communicate and to recognize (institute, as Bourdieu (1996)) certain sense of sustainability. The theoretical and methodological path articulate notions of discourse analysis, the main north reflections of Foucault (2006, 2012), Pêcheux ([88]2009), Orlandi (2009) and Maingueneau (1998, 2001, 2008, 2013). During the review process, we switch-also the systematization proposed by Baldissera (2009b) of the role of sustainability in the culture: 1) central value; 2) peripheral value and / or market strategy; 3) non-value, negative and / or fad; and 4) extrassistema value.