Made available in DSpace on 2014-12-17T14:57:53Z (GMT). No. of bitstreams: 1 JorgeFB.pdf: 2466045 bytes, checksum: 390a8dfd299d465779890586b1bd5be1 (MD5) Previous issue date: 2009-10-19 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / The State Bahia, Brazil, presents different geological sites it with a very expressive variety minerals. It is situated among the very important States which produces minerals for industries, such as pointed aggregate, ornamentals stones and ceramics raw materials. Nowadays only four companies producting ceramics tiles. Porcelainized stoneware tiles is one of the noblest ceramics, depicting low water absorption (typically below of 0,5%), in addition to excellent staining resistance and mechanical strength. The present work aims at investigating the potential of local raw materials for the production of porcelainized stoneware tiles. For this purpose, these materials were characterized by X-ray fluorescence, X-ray diffraction, particle size analysis, thermal gravimetric analysis, thermal differential analysis and dilatometric analysis. Admixtures containing different compositions were prepared and fired at four temperatures, 1100 ?C, 1150 ?C, 1200 ?C and 1250 ?C with isotherm for 60 minute and heathing rate of 5 oC/min. After firing the samples, they were characterized by water absorption tests, linear retraction, analysis, apparent porosity, apparent specific mass, flexural strength, and microstructural analysis by X-ray diffraction and scanning electron microscopy . The results revealed three ceramics with porcelainized stoneware tiles characteristics and porcelain tile will be produce from raw materials originated in the State of Bahia / O Estado da Bahia apresenta uma diversidade de terrenos geol?gicos que encerra uma expressiva dota??o mineral e est? situado entre os mais importantes Estados produtores de minerais industriais, ressaltando-se agregados, rochas ornamentais e mat?rias-primas cer?micas. Atualmente somente quatro empresas produzem placas cer?micas. O gr?s porcelanato ? uma das mais nobres cer?micas de revestimento devido a sua baixa absor??o d ?gua (tipicamente abaixo de 0,5%), al?m de apresentar excelentes caracter?sticas t?cnicas, destacando-se pelas elevadas resist?ncias mec?nica, ao risco e ao manchamento. O presente trabalho tem a finalidade de avaliar o potencial das mat?rias-primas, feldspato, argila e caulim, utilizado na produ??o de gr?s porcelanato no estado da Bahia. Para isso, foi feita a caracteriza??o das mat?rias-primas por fluoresc?ncia de raios X (FRX), difra??o de raios X (DRX), an?lise granulom?trica (AG), an?lise t?rmica gravim?trica (TG), an?lise t?rmica diferencial (DTA) e an?lise dilatom?trica, elaborando-se sete formula??es que foram queimadas nas temperaturas: 1100 ?C, 1150 ?C, 1200 ?C e 1250 ?C, com isoterma de 60 minutos e taxa de aquecimento de 5 oC/ min. Ap?s a queima, os corpos-de-prova foram submetidos a ensaios de absor??o de ?gua, retra??o linear, an?lise dilatom?trica, porosidade aparente, massa espec?fica aparente, resist?ncia ? flex?o, difra??o de raios X e microscopia eletr?nica de varredura. Em tr?s formula??es foram obtidas, propriedades compat?veis com as exigidas para a produ??o do gr?s porcelanato com mat?rias-primas oriundas do Estado da Bahia

Made available in DSpace on 2014-12-17T14:58:15Z (GMT). No. of bitstreams: 1 LuzinarioGS_DISSERT.pdf: 1489197 bytes, checksum: c6a09807d24f35bd75cfbad03d10f90b (MD5) Previous issue date: 2012-03-05 / Currently there is still a high demand for quality control in manufacturing processes of mechanical parts. This keeps alive the need for the inspection activity of final products ranging from dimensional analysis to chemical composition of products. Usually this task may be done through various nondestructive and destructive methods that ensure the integrity of the parts. The result generated by these modern inspection tools ends up not being able to geometrically define the real damage and, therefore, cannot be properly displayed on a computing environment screen. Virtual 3D visualization may help identify damage that would hardly be detected by any other methods. One may find some commercial softwares that seek to address the stages of a design and simulation of mechanical parts in order to predict possible damages trying to diminish potential undesirable events. However, the challenge of developing softwares capable of integrating the various design activities, product inspection, results of non-destructive testing as well as the simulation of damage still needs the attention of researchers. This was the motivation to conduct a methodological study for implementation of a versatile CAD/CAE computer kernel capable of helping programmers in developing softwares applied to the activities of design and simulation of mechanics parts under stress. In this research it is presented interesting results obtained from the use of the developed kernel showing that it was successfully applied to case studies of design including parts presenting specific geometries, namely: mechanical prostheses, heat exchangers and piping of oil and gas. Finally, the conclusions regarding the experience of merging CAD and CAE theories to develop the kernel, so as to result in a tool adaptable to various applications of the metalworking industry are presented / Com o crescimento das exig?ncias do controle de qualidade na fabrica??o de pe?as mec?nicas, surgiu a atividade de inspe??o de produtos finais, que vai desde a an?lise dimensional ? composi??o qu?mica. Essa tarefa geralmente ? feita atrav?s de diversos m?todos de ensaios n?o destrutivos que minimizam a possibilidade de falhas das pe?as. Os resultados produzidos pelas ferramentas utilizadas nas inspe??es n?o s?o capazes de definir geometricamente um dano (trincas, microtrincas, defeitos de fabrica??o etc.) e, portanto, n?o s?o adequados para a visualiza??o na tela de um computador. Na verdade, t?cnicas de visualiza??o de objetos virtuais em 3D s?o capazes de identificar certos danos que dificilmente seriam detectados por outros m?todos tradicionais. Existem alguns softwares comerciais que buscam auxiliar as etapas de um projeto e simula??o de pe?as mec?nicas no intuito de prever poss?veis danos para tentar mitigar poss?veis eventos indesej?veis (rompimento de pe?as, quebra de equipamentos etc.). Entretanto, o desafio do desenvolvimento de softwares capazes de integrar as v?rias atividades de projeto, inspe??o de produtos, resultados de ensaios n?o destrutivos e simula??es de danos ainda precisa da aten??o de pesquisadores. Dessa forma, fez-se um estudo metodol?gico para a elabora??o de um kernel (n?cleo computacional) piloto do tipo CAD/CAE de grande versatilidade, capaz de auxiliar programadores no desenvolvimento de softwares que usam Engenharia Reversa como base aplicados ?s atividades de projeto e simula??o de casos em que pe?as mec?nicas s?o submetidas a solicita??es diversas. A cria??o do kernel deu-se atrav?s da aplica??o da Computa??o Gr?fica em conjunto com as teorias CAD e CAE e com o aux?lio da realidade virtual. Nesta disserta??o apresentam-se resultados em que o kernel desenvolvido foi aplicado com sucesso a estudos de casos de pe?as com geometrias espec?ficas, a saber: pr?teses mec?nicas, trocadores de calor e tubula??es de petr?leo e g?s. Finalmente, s?o apresentadas as conclus?es referentes ? experi?ncia da hibridiza??o das teorias CAD e CAE para o desenvolvimento do kernel, de forma a resultar numa ferramenta adapt?vel ?s mais diversas aplica??es da ind?stria metal-mec?nica

Made available in DSpace on 2014-12-17T15:01:34Z (GMT). No. of bitstreams: 1 AlcivanAEN_DISSERT.pdf: 2539758 bytes, checksum: 98834925b30009da72c23123f8795698 (MD5) Previous issue date: 2013-11-11 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / This work studies two methods for drying sunflower grains grown in the western region of Rio Grande do Norte, in the premises of the Instituto Federal de Educa??o, Ci?ncia e Tecnologia do Rio Grande do Norte - IFRN - Campus Apodi. This initiative was made because of the harvested grain during the harvest, being stored in sheds without any control of temperature, humidity etc. Therewith, many physical, chemical and physiological characteristics are compromised and grains lose much quality for oil production as their germination power. Taking into account that most of the stored grain is used for replanting, the studied methods include drying of grains in a thin layer using an oven with air circulation (fixed bed) and drying in a spouted bed. It was studied the drying of grains in natura, i.e., newly harvested. The fixed bed drying was carried out at temperatures of 40, 50, 60 and 70?C. Experiments in spouted bed were performed based on an experimental design, 2? + 3, with three replications at the central point, where the independent variables were grains load (1500, 2000 and 2500 g) and the temperature of the inlet air (70, 80, and 90 ?C), obtaining the drying and desorption equilibrium isotherms. Previously, the characteristic curves of the bed were obtained. Both in the fixed bed as in the spouted bed, drying and desorption curves were obtained by weighing the grains throughout the experiments and measurements of water activity, respectively. The grains drying in the spouted bed showed good results with significant reduction of processing time. The models of FICK and PAGE were fitted to the experimental data, models which will represent the drying of grains both in the fixed bed as in the spouted bed. The desorption curves showed no influence of the processing temperature in the hygroscopic characteristics of the grains. The models of GAB, OSWIN and LUIKOV could well represent the desorption isotherms / Neste trabalho, foram estudados dois m?todos de secagem para os gr?os de girassol cultivados na regi?o do Oeste Potiguar, nas depend?ncias do Instituto Federal de Educa??o, Ci?ncia e Tecnologia do Rio Grande do Norte IFRN Campus Apodi. Tal iniciativa se deu pelo fato dos gr?os colhidos no per?odo da safra ficarem armazenados em galp?es sem qualquer tipo de controle da temperatura, umidade etc. Com isso, muitas caracter?sticas f?sicas, qu?micas e fisiol?gicas ficam comprometidas e os gr?os tanto perdem qualidade para produ??o de ?leo como seu poder germinativo. Levando em conta que boa parte dos gr?os estocados ? utilizada para replantio, os m?todos estudados contemplam a secagem dos gr?os em camada fina utilizando estufa com circula??o de ar (leito fixo) e a secagem em leito de jorro. Estudou-se a secagem dos gr?os in natura, ou seja, rec?m-colhidos. A secagem em estufa foi realizada nas temperaturas de 40, 50, 60 e 70 ?C. Os experimentos em leito de jorro foram realizados com base em um planejamento experimental do tipo 22 + 3, com tr?s repeti??es no ponto central, onde as vari?veis independentes foram a carga de gr?os (1500, 2000 e 2500 g) e a temperatura do ar alimentado (de 70, 80 e 90 ?C), obtendo-se as curvas de secagem e as isotermas de equil?brio do gr?os. Previamente, foram obtidas as curvas caracter?sticas do leito. Tanto na estufa como no leito de jorro foram obtidas as curvas de secagem e as isotermas de equil?brio atrav?s da pesagem dos gr?os ao longo dos experimentos e das medidas de atividade de ?gua, respectivamente. A secagem dos gr?os no leito de jorro apresentou bons resultados com significativa diminui??o do tempo de processamento. Foram ajustados os modelos de FICK e PAGE aos dados experimentais, modelos estes que representaram muito bem a secagem dos gr?os tanto na estufa como no leito de jorro. As isotermas de equil?brio mostraram que n?o houve influ?ncia da temperatura de processamento nas caracter?sticas higrosc?picas dos gr?os. Os modelos de GAB, OSWIN e LUIKOV conseguiram representar bem as isotermas de equil?brio na temperatura de 25?C

Made available in DSpace on 2014-12-17T15:05:06Z (GMT). No. of bitstreams: 1 FranciscoCO.pdf: 1310311 bytes, checksum: f0b9fd0c2c5ee62f1c8154cb767565b0 (MD5) Previous issue date: 2007-06-12 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / This study describes about graduation s students difficulties of to draw functions graph. Specifically, we intend to observe their abilities evolution, as well as their difficulties during Calculus I subject in engineering course. For that, we show them publications about the elaboration of graphs and its difficulties in obstacle terms and some researches witch contain this subject and that it was done during postgraduate studies in mathematical education. It shows by research methodology aspects related to French didatic s mathematic and some theories of cognitive psychology considering the high value between theoretical-methodological relation that was evidenced in both theoretical conceptions about ways to understand and teach mathematic. This methodology is based on didactic engineering purpose, that consist in preliminaries analysis, conception and didactic sequence analysis prior, trials by application followed analysis up and conclusion. We had also used pedagogicals actions and analysis of results achieved, to classify types of errors made by the 2005 s students during second semester, from conceptions related to the episthemologic and didactics obstacles / Neste estudo descrevemos as dificuldades de um grupo de alunos de gradua??o no que diz respeito ao ato de tra?ar gr?ficos de fun??es. Especificamente, investigamos a evolu??o das suas habilidades, assim como suas dificuldades no decorrer da disciplina C?lculo I, no curso de Engenharia. Para tanto, analisamos publica??es sobre elabora??o de gr?ficos e suas dificuldades em termos de obst?culo, bem como abordamos alguns relat?rios de pesquisa relacionados ao tema em quest?o e que foram realizadas no ?mbito dos estudos da p?s-gradua??o em Educa??o Matem?tica. Mostramos que atrav?s dos aspectos relacionados ? linha francesa da Did?tica da Matem?tica e de algumas teorias da Psicologia Cognitiva, ? poss?vel estabelecer uma importante conex?o te?rico-metodol?gica entre ambas as concep??es te?ricas acerca dos modos de compreender e ensinar matem?tica. Esta metodologia fundamenta-se na proposta da Engenharia Did?tica, que consiste em an?lises preliminares, concep??o e an?lise a priori da seq??ncia did?tica, experimenta??o atrav?s de sua aplica??o seguida da an?lise a posteriori e conclus?o. Houve, tamb?m, a necessidade de recorremos a Interven??o Pedag?gica e An?lise dos Resultados Obtidos, para classificarmos e analisarmos os v?rios tipos de erros apresentados pelos alunos durante o segundo semestre de 2005, a partir das concep??es referentes aos obst?culos epistemol?gicos e did?ticos

Cette thèse vise à explorer la question du changement d'échelle temporelle en modélisation hydrologique conceptuelle. Les principaux objectifs sont : (i) étudier les effets du changement du pas de temps sur les performances, les paramètres et la structure des modèles hydrologiques ; (ii) mettre au point un modèle pluie-débit applicable à différents pas de temps. Notre point de départ est le modèle global journalier GR4J, développé à Irstea. Ce modèle a été choisi comme le modèle de référence à adapter à d'autres résolutions plus fines, jusqu'à des pas de temps infra-horaires, en suivant une approche descendante. Pour nos tests, nous avons construit une base de données de 240 bassins versants non influencés en France, à différents pas de temps allant de 6 minutes à 1 jour, en utilisant: (i) les données pluviométriques à 6 minutes et la réanalyse des lames d'eau journalières à plus haute résolution spatiale ; (ii) les données de température journalière pour le calcul de l'évapotranspiration potentielle ; (iii) les données hydrométriques à pas de temps variable. Nous avons étudié l'impact de la distribution temporelle des entrées sur les performances du modèle en se focalisant sur la simulation de crue, sur la base de 2400 événements. Ensuite, notre évaluation du modèle a porté sur l'analyse de la cohérence des flux internes du modèle à différents pas de temps, afin d'assurer une performance satisfaisante à travers un fonctionnement du modèle cohérent. Notre diagnostic du modèle nous a permis d'identifier une amélioration de la structure du modèle à différents pas de temps infra-journaliers basée sur la complexification de la composante d'interception du modèle. / This thesis aims at exploring the question of temporal scaling in lumped conceptual hydrological modelling. The main objectives of the thesis are to: (i) study the effects of varying the modelling time step on the performance, parameters and structure of hydrological models; (ii) develop a hydrological model operating at different time steps, from daily to sub-hourly, through a unified, robust and coherent modelling framework at different time scales. Our starting point is the chain of conceptual rainfall-runoff models called ‘GR’, developed at Irstea, and in particular the daily ‘GR4J’ lumped model. The GR4J model will be the baseline model to be effectively downscaled up to sub-hourly time steps following a top-down approach. An hourly adaptation of this model had already been proposed in previous research studies, but some questions on the optimality of the structure at sub-daily time steps were still open. This thesis builds on these previous studies on the hourly model and responds to the operational expectations of improving and adapting the model at multiple sub-daily and sub-hourly time steps, which is particularly interesting for flood forecasting applications. For our modelling tests, we built a database of 240 unregulated catchments in metropolitan France, at multiple time steps, from 6-minute to 1 day, using fine time step hydro-climatic datasets available: (i) 6-min rain gauges and higher spatial-density daily reanalysis data for precipitation; (ii) daily temperature data for potential evapotranspiration (making assumptions on sub-daily patterns); (iii) sub-hourly variable time step streamflow data. We investigated the impact of the inputs temporal distribution on model outputs and performance in a flood simulation perspective based on 2400 selected flood events. Then our model evaluation focused on the consistency of model internal fluxes at different time steps, in order to ensure obtaining a satisfactory model performance by a coherent model functioning at multiple time steps. Our model diagnosis led us to identify and test a significant improvement of the model structure at sub-daily time steps based on the complexification of the interception component of the model. Thus, we propose a new version of the model at multiple sub-daily time steps, with the addition of an interception store without extra free parameters. Our tests also confirm the suitability at multiple time steps of a modified groundwater exchange function proposed earlier, leading to overall improved model accuracy and coherence.

In this thesis, methods of implementing an online gesture recognition system for the novel Stylaero Board device are investigated. Two methods are evaluated - one based on LSTMs and one based on HMMs - on three kinds of gestures: Tap, circle, and flick motions. A method’s performance was measured in its accuracy in determining both whether any of the above listed gestures were performed and, if so, which gesture, in an online single-pass scenario. Insight was acquired regarding the technical challenges and possible solutions to the online aspect of the problem. Poor performance was, however, observed in both methods, with a likely culprit identified as low quality of training data, due to an arduous and complex gesture performance capturing process. Further research improving on the process of gathering data is suggested.

Citizenship - commitment to and participation in a political community - is the heart of constitutional democracy and a free society. Knowledge of the rights, responsibilities, and privileges are the electrical impulses that keep a steady beat. Without the participation of educated citizens, a democratic republic can not and does not function. This study analyzed the relationship between adolescent behavior and civic engagement. This task was accomplished by examining the amount of civic knowledge possessed by two groups within a population. The population examined, a high school in Flagler County, was composed of "at risk" students (those who had an Individualized Education Plan) and "regular" students (those that did not). The study uncovered the message that the amount of civic knowledge possessed by American youth was not as important as it was for them to be engaged in extracurricular activities. During the course of time, educators appear to have restricted their own ability to plan for and provide learning experiences that take in to consideration the physical characteristics; physical needs; patterns of growth and maturation; physiological changes; intellectual development; intellectual characteristics; learning preferences and styles; emotional development; personality development; and social development of each and every young adolescent attending school. When interesting, affordable activities are not made available, students become bored and get in to trouble during after school hours. Adolescent behaviors such as moral judgment and risk taking (or lack thereof) affect their decision to become civically involved.

Thèse numérisée par la Direction des bibliothèques de l'Université de Montréal. / Les récepteurs nucléaires sont des facteurs transcriptionnels impliqués dans la regulation de la croissance cellulaire, en partie dû à leurs effets génomiques. Une voie alternative est l'interference entre les récepteurs nucléaires et le facteur transcriptionnel AP-1 (activator protein-1), composé de protéines induites par plusieurs facteurs de croissance et molécules de signalisation. Dans ce projet, j'ai analysé les mécanismes d'interférence transcriptionnelle entre les récepteurs des oestrogènes (ER), les récepteurs des glucocorticoïdes (GR) et AP-1. / Nuclear receptors constitute a large superfamily of DNA binding transcriptional regulators that can regulate a diversity of important cellular events, such as development, differentiation, and responses to extracellular stimuli. These effects are mediated mostly by the genomic effects of nuclear receptors which bind selectively to DNA (hormone response element), and regulate target gene transcription. An alternative pathway of transcriptional regulation is the crosstalk between nuclear receptors and other transcription factors, such as NPKB, or activator protein-1 (AP-1). Transcription factor AP-1 is composed of nuclear proteins encoded by the Jun family and Fos family of protooncogenes, whose transcription is rapidly induced by a number of growth factors and other signaling molecules. AP-1 is implicated in diverse aspects of cell growth, differentiation and development. In this project, I have focused on the analysis of the mechanisms of transcriptional interference between nuclear receptors and AP-1.

[pt] Em tubulações industriais e dutos, a presença de biofilme pode ocasionar danos localizados (pites e alvéolos), levando a vazamentos e redução da área de fluxo devido à formação de biomassa. Aços grau API são os materiais usualmente utilizados nas tubulações industriais e dutos que podem ser afetados pelo fenômeno de corrosão induzida por microrganismos (CIM). A CIM ocorre devido a interações entre os grupos microbianos presentes no biofilme formado, a liberação de produtos metabolitos, e a relação destes com a superfície do metal. Foi realizado um estudo do comportamento de aços graus API B, X-65 e X-80, em presença de água do mar sintética com adição de cultura mista de bactérias (BRS; BPF; BPA) em sistema dinâmico, e comparados com meio sem adição de microrganismos. Foram realizadas analises químicas do fluido de processo e a quantificação microbiana das bactérias planctônicas e sésseis que demonstraram a relação entre os grupos bacterianos dentro dos biofilmes formados e sua cinética ao longo do tempo. Microscopia eletrônica de varredura e espectroscopia de dispersão de energia foi aplicada para visualização do biofilme e seus produtos de corrosão. A extensão, severidade e morfologia da corrosão dos aços API foi avaliada por microscopia ótica, sendo possível relacionar o efeito no processo corrosivo com o consorcio de microrganismos presente, tendo sido ainda avaliado a influência da microestrutura dos diferentes aços nos sítios preferenciais de nucleação de pites. / [en] In industrial and transportation pipelines, the presence of biofilms may cause localized damage (pitting), leading to leakages and reduction of flow area due to the formation of biomass. API grade steels pipes are the materials commonly used in industrial and transportation pipelines and may be affected by this type of phenomenon. The microbiologically influenced corrosion (MIC) occurs due to interactions between the microbial groups present in the biofilm, the release of metabolites and their relation with the metal surface. The present work study of the behavior of API pipe steels degrees B, X-65 and X-80 in synthetic sea water containing mixed culture of bacteria (SRB, APB, IOB) carried out on a dynamic system and compared to medium without added microorganisms. Chemical analysis of the process fluid and quantification of microbial planktonic and sessile bacteria performed showed the relation between bacterial groups within biofilms and their kinetics over time. Scanning electron microscopy and energy dispersive spectroscopy was applied for visualization of biofilms and their corrosion products. The extent, severity and morphology of corrosion of API pipe steels were assessed by optical microscopy, being possible to relate the effect of the consortium of microorganisms on the corrosion process. Also the influence of microstructure of different steels in preferential nucleation sites for pitting were evaluated.

Modern Russian science notes the systematic crisis in the sphere of supplementary children education. GR-technologies are gaining importance in this context as a way to achieve optimum results further education sector development through public investment, taking into account the interests of the business. Author of this dissertation present the results of sociological research of the supplementary child education system in Yekaterinburg. The research is described the effectiveness of GR-technologies in the sphere of providing supplementary education for children. The study was conducted by the method of expert survey. Author surveyed entrepreneurs, public servants, leaders of children organizations of supplementary education in Yekaterinburg. Hypothesis-ground of research supports the following goal: on the one hand that only one third of experts familiar and implements in its activities the GR-technologies and on the other hand improving the quality of the application GR-technologies used by public organizations and business provides high levels of creating favorable conditions for the development system of supplementary children education. / Современная наука и государственный аппарат России фиксируют системный и содержательный кризис сферы дополнительного образования детей. GR-технологии приобретают важное значение как способ достижения оптимальных результатов развития сферы дополнительного образования через государственные инвестиции с учетом интересов бизнеса. Автором магистерской диссертации проведено эмпирическое исследование, в результате которого описана эффективность применения GR-технологий в сфере дополнительного образования детей. Исследование проведено методом экспертного опроса руководителей организаций дополнительного образования детей, бизнеса и властных структур г. Екатеринбурга. Гипотезой-основанием исследования выступает следующее утверждение: с одной стороны опрос экспертов показал, что только треть из них знакома и реализует в своей деятельности GR-технологии, а с другой стороны - именно повышение качества применения GR-технологий в системе дополнительного образования детей обуславливает высокий уровень создания благоприятных условий для развития дополнительного образования детей.