Submitted by Celso Magalhaes (celsomagalhaes@ufrrj.br) on 2017-06-19T12:46:55Z No. of bitstreams: 1 2016 - Iasmim Cristina Martins da Silva.pdf: 945572 bytes, checksum: cb9a721c611d3dd80c53ca9fd008054a (MD5) / Made available in DSpace on 2017-06-19T12:46:55Z (GMT). No. of bitstreams: 1 2016 - Iasmim Cristina Martins da Silva.pdf: 945572 bytes, checksum: cb9a721c611d3dd80c53ca9fd008054a (MD5) Previous issue date: 2016-03-02 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / To Schopenhauer, a genius is characterized by the surplus of the faculty of knowing, which allows these individuals to have immediate access to the Idea through the intuitive contemplation, while a pure being of the knowledge. However, this potentiality amplifies the genius? will, when the status of individual is retaken. According to the philosopher, the surplus of the faculty of knowing may take two guidances, which exclude themselves: the objective guidance, when one is freed from the bondage of the will, or the indirect guidance, occasion when the surplus is available to the individual guidance. As a consequence of the surplus, the genius either neglects suffering or suffers radically. This work intends to present the following hypothesis: the genius goes through existential drama that greatly surpasses the natural suffering inherent to other people. Thereunto Torquato Tasso, Goethe?s work, was utilized, since it has been mentioned by Schopenhauer / Para Schopenhauer, o que caracteriza o g?nio ? o excedente da faculdade de conhecer (genialidade) que lhe possibilita acesso imediato ? Ideia por meio da contempla??o intuitiva, enquanto puro sujeito do conhecimento. Todavia, esta mesma potencialidade amplifica a vontade do g?nio, quando este retoma a condi??o de indiv?duo. Segundo o fil?sofo, o excedente da faculdade de conhecer pode tomar duas orienta??es, excludentes entre si: a orienta??o objetiva, quando ele se torna livre da servid?o da vontade, ou a orienta??o subjetiva, ocasi?o em que o excedente se coloca a servi?o da vontade individual. Por conta dessas duas orienta??es do excedente, o g?nio ora se abst?m do sofrimento, ora sofre de maneira extremada. O presente trabalho pretende apresentar a hip?tese de que o g?nio vivencia um drama existencial, que ultrapassa sobremodo o sofrimento natural inerente aos outros homens. Para tanto, objetiva-se recorrer ? obra Torquato Tasso do Goethe, citada pelo pr?prio Schopenhauer.

Submitted by Celso Magalhaes (celsomagalhaes@ufrrj.br) on 2017-07-06T13:19:39Z No. of bitstreams: 1 2015 - Naraiana Lopes Taborda.pdf: 2569264 bytes, checksum: dd82638f045c3152324e7f8757f3a526 (MD5) / Made available in DSpace on 2017-07-06T13:19:39Z (GMT). No. of bitstreams: 1 2015 - Naraiana Lopes Taborda.pdf: 2569264 bytes, checksum: dd82638f045c3152324e7f8757f3a526 (MD5) Previous issue date: 2015-12-22 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico - CNPq / The current work aimed to increase the knowledge of biodiversity of parasite of fishes, unknown to some groups. In Chapter 1 the aim was described the new species ergasilid copepod Ergasilus von Nordmann, 1832, found on the gills of two cichlid fishes, Geophagus argyrostictus Kullander, 1991 (type host) and G. altifrons Heckel, 1840, caught in the Xingu River around Altamira, State of Par?, Brazil. The new species is the first record of genus Ergasilus found on fishes G. argyrostictus e G. altifrons. In Chapter 2, species of Encotyllabe Perciformes host were analyzed by molecular study, with analysis of cytochrome c oxidase I gene (COI) and morphological study. These data identify two new species, a parasite of Pagrus pagrus (Sparidae) and other of Orthopristis ruber (Haemulidae), and addition of the sequence mitochondrial DNA to E. souzalimae Carvalho e Luque, 2012. / O presente trabalho teve como objetivo ampliar os conhecimentos sobre a biodiversidade de parasitos de peixes, visto o escasso conhecimento para alguns grupos. No cap?tulo 1 objetivamos a descri??o de uma nova esp?cie do cop?pode parasito Ergasilus von Nordmann, 1832, encontrado parasitando as br?nquias de duas esp?cies de cicl?deos, Geophagus argyrostictus Kullander, 1991 (esp?cie tipo) e G. altifrons Heckel, 1840, capturados no Rio Xingu em torno de Altamira, Estado do Par?, Brasil. A nova esp?cie ? o primeiro registro do g?nero Ergasilus encontrado em peixes G. argyrostictus e G. altifrons. No cap?tulo 2, esp?cies de Encotyllabe encontradas em hospedeiros Perciformes foram analisadas atrav?s do estudo molecular, com an?lise do gene citocromo c oxidase I (COI) e morfol?gico. Estes dados identificam duas esp?cies novas, uma parasita de Pagrus pagrus (Sparidae) e outra de Orthopristis ruber (Haemulidae) e a adi??o da sequ?ncia de DNA mitocondrial para E. souzalimae Carvalho e Luque, 2012.

Submitted by Sandra Pereira (srpereira@ufrrj.br) on 2017-07-10T13:03:11Z No. of bitstreams: 1 2010 - Daniel da Silva Guedes Junior .pdf: 3397672 bytes, checksum: fea6a394bbb430b666ddc9c054a24c27 (MD5) / Made available in DSpace on 2017-07-10T13:03:11Z (GMT). No. of bitstreams: 1 2010 - Daniel da Silva Guedes Junior .pdf: 3397672 bytes, checksum: fea6a394bbb430b666ddc9c054a24c27 (MD5) Previous issue date: 2010-02-10 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico, CNPq, Brasil. / The geographic distribution of bovine borreliosis is determined by the dispersion of its vector. Borrelia theileri is the predominant species in cattle, and B. coriaceae and B. burgdorferi also been reported causing clinical disease. B. theileri cause mild disease in cattle, and still is important for its potential to be confused with the spirochete of Lyme disease, B. burgdorferi, and agents of epizootic bovine abortion, B. coriaceae. In Brazil, as well as in other South American countries, the agent of this disease has not been isolated further confusing the diagnosis. The objective of this study was to identify genotypically Borrelia sp that affects cattle in Brazil. DNA extraction, was performed from blood and ticks of cattle with positive serology by indirect ELISA with crude antigen of Borrelia burgdorferi. Primers were designed for genes of Borrelia burgdorferi and B. theileri groups: 16S, flaA, flaB, GroEL, hbb, recA, 5s-23s, p66, rrs, rpoB and glpq. After the PCR reaction, only the primers amplified rrs and rpoB sequences. The predictive amino acid sequence of RRS3 revealed 99% homology with B. hermsii and B. duttonii and predictive amino acid sequence of RPOB showed 67% homology with B. duttonii and B. recurrentis. This suggests that the species of Borrelia sp present in Brazil is not owned by group B. burgdorferi. Little is known regarding the genetic variability of genes that encode membrane proteins of Brazilian isolates of A. marginale. The products of these genes constitute an important tool, as there may be significant antigen polymorphism, which may damage cross-protection between isolates and the chances of identifying candidate immunogens. The aim of the present study was to determine the degree of conservation of sequences of these genes in a Brazilian isolate of A. marginale comparing with Saint Maries and Florida isolates. For this, primers were designed to amplify the genes omp1, omp4, omp5, omp7, omp8, omp10, omp14, omp15, sodb, opag1, opag3, virb3, am097 (VirB9-1), am956 (PepA), am254 (ef-tu), am854 by PCR. The genes were then sequenced by Sanger method and the predicted amino acid sequences aligned and homology analyzed by the program CLUSTAL W. With the exception of OMP 7 all proteins (OMP1, OMP4, OMP5, OMP8, OMP10, OMP14, OMP15, SODB, OPAG1, OPAG3, VIRB3, VIRB9-1, PepA, EF-Tu, AM854) exhibited homology greater than 92% with other A. marginale isolates. However, only OMP1, OMP5, EF-Tu, VirB3, SODB, VIRB9-1 e AM854 showed homology greater than 72% regarding to A. marginale centrale which confers cross-protection against A. marginale. / A distribui??o geogr?fica da borreliose bovina ? determinada pela dispers?o do seu vetor. Borrelia theileri ? a esp?cie predominante em bovinos, sendo que B. burgdorferi e B. coriaceae tamb?m foram relatadas causando doen?a cl?nica. Portanto, B. theileri causa doen?a leve em bovinos, e ainda ? importante pelo seu potencial em ser confundido com a espiroqueta da Doen?a de Lyme, B. burgdorferi, e com agentes do Aborto Epizo?tico bovino, B. coriaceae. No Brasil, assim como em outros pa?ses Sul americanos, o agente desta enfermidade ainda n?o foi isolado prejudicando ainda mais o diagn?stico. O objetivo deste trabalho foi ? identifica??o genot?pica da esp?cie de Borrelia sp que acomete bovinos no Brasil. Foram utilizados para extra??o de DNA, o sangue e carrapatos de bovinos com sorologia positiva ao ELISA indireto com ant?geno bruto para Borrelia burgdorferi. Foram desenhados oligonucleot?deos iniciadores para genes dos grupos Borrelia burgdorferi e B. theileri: 16S, flaA, flaB, groel, hbb, recA, 5s-23s, p66, rrs, rpob e glpq. Ap?s a rea??o de PCR, somente os oligonucleot?deos iniciadores rrs e rpob amplificaram seq??ncias. A seq??ncia preditiva de amino?cidos de RRS3 revelou homologia de 99% com B. hermsii e B. duttonii e a seq??ncia preditiva de amino?cidos de RPOB demonstrou 67% de homologia com B. duttonii e B. recurrentis. Isto sugere que a esp?cie de Borrelia presente no Brasil n?o seja pertencente ao grupo de B. burgdorferi. Pouco se sabe sobre a variabilidade gen?tica dos genes que codificam prote?nas de membrana de isolados brasileiros de A. marginale. O produto destes genes constitui uma ferramenta importante, pois pode haver polimorfismo antig?nico, que pode prejudicar a prote??o cruzada entre os isolados e as chances de identifica??o de candidatos a imun?genos. O objetivo do presente estudo foi determinar o grau de conserva??o das seq??ncias destes genes em um isolado brasileiro de A. marginale frente aos isolados Saint Maries, Florida e A. marginale centrale. Para tanto, oligonucleot?deos foram desenhados para amplificar os genes omp1, omp4, omp5, omp7, omp8, omp10, omp14, omp15, sodb, opag1, opag3, virb3, am097 (VirB9- 1), am956 (PepA), am254 (ef-tu), am854 por PCR. Os genes foram ent?o seq?enciados pelo m?todo de Sanger e as seq??ncias preditas de amino?cidos alinhadas e a homologia analisada atrav?s do programa CLUSTAL W. Com exce??o de OMP 7 todas as demais (OMP1, OMP4, OMP5, OMP8, OMP10, OMP14, OMP15, SODB, OPAG1, OPAG3, VIRB3, VIRB9-1, PepA, EF-Tu, AM854) apresentaram n?veis de homologia de 92 a 100% entre os isolados de A. marginale. Destas, apenas OMP1, OMP5, EF-Tu, VirB3, SODB, VIRB9-1 e AM854 apresentaram homologia superior a 72% em rela??o a A. marginale centrale, o qual confere prote??o cruzada contra A. marginale.

Submitted by Celso Magalhaes (celsomagalhaes@ufrrj.br) on 2017-07-11T13:40:59Z No. of bitstreams: 1 2012 - Luzimary de Jesus Ferreira Godinho Rocha.pdf: 1344154 bytes, checksum: 0659f7d53a1501d32b67bcaa4079a4da (MD5) / Made available in DSpace on 2017-07-11T13:40:59Z (GMT). No. of bitstreams: 1 2012 - Luzimary de Jesus Ferreira Godinho Rocha.pdf: 1344154 bytes, checksum: 0659f7d53a1501d32b67bcaa4079a4da (MD5) Previous issue date: 2012-07-26 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / The pitaya or Cereus undatus pitaya or, synonymy: Hylocereus guatemalensis, H.undatus is exotic fruit consumption and slightly increasing in our country. The functional assignments given to this fruit, common sense encourages the study of their physical, chemical and microbiological. It should be noted that the fruits are primary sources of several vitamins and other bioactive compounds, for example, phenolic fibers, and sugars. The intake of these compounds increases the immunity of individuals, leading to improved levels of health, physical and mental performance. The reference values for these nutrients pitaya, also, are unknown to the general public, as this is a fruit intake of a wealthy class, for its price is too high for our Brazilian standards. In food matrices are very complex, given its inherent characteristics. Thus, there are several techniques used for quantitative analysis of bioactive compounds, among them, have a High Performance Liquid Chromatography (HPLC) and UV-visible spectrophotometry. The objective of this study is to quantify the presence of vitamin C, anthocyanins and sugars in pitayas white and red pulp by HPLC, as well as to determine, although the content of antioxidant activity by the method of capturing the radical 2,2 '- azinobis ( 3-etilbenzenotiazolina-6-sulfonic acid - ABTS), soluble solids (? Brix) is determined in a digital refractometer, as well as acidity and pH. The soluble solids found can confirm that the samples of red pitaya have higher sugar content than the white pulp. The pH and total acidity (g citric acid/100g fruit), should also be monitored and analyzed, possibly under conditions of controlled cultivation of this food because it is an exotic fruit and consumption in our country recently. As for the results of anthocyanins, because it is a dye that rapidly degrades, its presence became insignificant, being found only in the halo of red pulp pitaya, requiring further analysis and monitoring standards in a more specific. There was a low antioxidant activity in the samples, as well as its content of vitamin C, these values should be found, first, the storage time, which decreases the levels of these analytes. / A pitaya ou Cereus undatus, sinon?mia: Hylocereus guatemalensis, H.undatus ? uma fruta ex?tica e de consumo ligeiramente crescente no nosso pa?s. As atribui??es funcionais dadas a essa fruta, pelo senso comum, incita ao estudo das suas caracter?sticas f?sicas, qu?micas e microbiol?gicas. Deve-se ressaltar que as frutas s?o fontes prim?rias de v?rias vitaminas e outros compostos bioativos, como por exemplo, os compostos fen?licos, fibras e a??cares. A ingest?o desses compostos aumenta a imunidade dos indiv?duos, induzindo a melhoria dos n?veis de sa?de, rendimento f?sico e mental. Os valores de refer?ncia desses nutrientes para a pitaya, ainda, s?o desconhecidos do grande p?blico, por ser esta uma fruta de consumo de uma classe abastada, por seu pre?o ser demasiadamente alto para os nossos padr?es brasileiros. As matrizes em alimentos s?o muito complexas, dadas as suas caracter?sticas intr?nsecas. Diante disso, v?rias s?o as t?cnicas utilizadas para determina??es anal?ticas de compostos bioativos, dentre elas, t?m-se a Cromatografia L?quida de Alta Efici?ncia (CLAE) e espectrofotometria U.V vis?vel. O objetivo deste trabalho ? quantificar a presen?a de vitamina C, antocianinas e a??cares nas pitayas de polpas branca e vermelha por CLAE, bem como, determinar, ainda, o teor de atividade antioxidante pelo m?todo de captura do radical 2,2?- azinobis (3-etilbenzenotiazolina-6-?cido sulf?nico ? ABTS), teores de s?lidos sol?veis (?Brix) determinado em um refrat?metro digital, al?m da acidez e pH. O teor de s?lidos sol?veis encontrados pode confirmar que as amostras de pitaya vermelha t?m maiores teores de a??cares que a de polpa branca. Quanto ao valor de pH e acidez total titul?vel (g de ?cido c?trico/100g de fruta), precisam, ainda, ser monitorados e analisados, possivelmente, sob condi??es de cultivo controlado desse alimento por se tratar de uma fruta ex?tica e de recente consumo no nosso pa?s. Quanto aos resultados das antocianinas, por se tratar de um corante que degrada rapidamente, a sua presen?a mostrou-se irris?ria, sendo encontrada somente no halo da pitaya de polpa vermelha, necessitando de mais an?lises e padroniza??es em condi??es mais espec?ficas de monitoramento. Houve baixa atividade antioxidante nas amostras analisadas, bem como o seu teor de vitamina C, esses valores encontrados devem-se, primeiramente, ao tempo de armazenamento, que diminui os teores desses analitos.

Dos nos jours, l'évolution croissante des domaines d'application des circuits intégrés impose aux industriels de nouvelles contraintes de conception. Afin de réaliser des circuits électroniques plus denses et plus performants, ils cherchent à faire cohabiter plusieurs types de composants sur des surfaces plus petites et de surcroît, fonctionnant à des fréquences de plus en plus élevées. Cependant, cette cohabitation pourrait générer des problèmes de CEM (compatibilité électromagnétique). Les travaux présentés dans ce mémoire rentrent dans le cadre du projet de recherche SEISME (Simulation de l'Emission et de l'Immunité des Systèmes et Modules Electroniques). Ils décrivent des méthodologies de mesure et de modélisation de’immunité conduite des circuits intégrés complexes comme les mémoires non volatiles ou bien les microcontrôleurs. L'objectif est d'étudier l'influence des changements de composants et de cartes sur le comportement électromagnétique d'un système électronique. Dans cette perspective, afin de valider son utilisation dans le cas des circuits intégrés complexes, une étude détaillée du standard de mesure DPI (Direct Power injection) est d'abord proposée. Basé sur cette dernière, un nouveau prototype de chemin de couplage est réalisé. Ce multiplexeur permet de superposer un signal agresseur à un signal fonctionnel, avec un chevauchement de leurs bandes de fréquences. Ainsi, il est possible d'agresser une broche fonctionnelle (horloge par exemple) d'un circuit intégré pendant son fonctionnement. Ensuite, une procédure de mesure globale d'immunité conduite est présentée. Elle permet de caractériser la susceptibilité conduite des circuits complexes en tenant compte des différents modes de fonctionnement et avec la possibilité d’utiliser un critère d’immunité fonctionnel ou électrique. Grâce à l'application de cette procédure à deux mémoires non volatiles compatibles broche à broche (mêmes caractéristiques mais de deux différents fournisseurs), il est possible de constater l’influence des technologies de fabrication sur l’immunité conduite de ce type de circuits. Par conséquent, l’effet du changement de composant sur le comportement électromagnétique d’un système électronique devient prédictible. Enfin pour la modélisation, deux méthodologies sont proposées. Une au niveau composant et l'autre au niveau carte. La démarche de modélisation au niveau composant repose sur le standard ICIM-CI (Integrated Circuit Immunity Model-Conducted Immunity) et vise à générer un modèle d’immunité simulable et prédictif. Grâce à l'application de cette démarche dans le contexte des mémoires non volatiles, il est possible de prédire leur immunité dans le cas de modification de l’impédance d'entrée par rajout d'éléments de filtrage par exemple. En ce qui concerne la modélisation au niveau carte, une procédure basée sur la proposition de modèle EBIM-CI (Electronic Board Immunity Model-Conducted Immunity) est développée. Elle consiste à générer un modèle d’immunité d’une carte électronique en utilisant les modèles des différents composants qui la constituent. Un cas d’étude a été défini. Le modèle issu de cette approche permet de simuler l’immunité conduite globale du démonstrateur ainsi que de prédire le comportement électromagnétique de ce dernier lors du changement d’un ou plusieurs composants. / Nowadays, the growing evolution of application fields for integrated circuits sets new constraints for designers and manufacturers. Due to continuous technological advances in integrated circuits, those have become smaller, denser and operational at higher frequencies. The miniaturization of integrated circuits has led to the reduction of power consumption and, thus, noise margins. Mixing digital and analog functions inside the same chip also makes electromagnetic interferences (EMis) more likely to spread and cause disturbances. As a result, complex ICs with coexisting different functions represent a challenge from an EMC point of view, as interferences can cause critical functional failures. The work presented in this manuscript falls within the SEISME project which aims, among others, to perform the simulation of both the emission and the immunity of electronic systems and modules at different levels (JC, PCB, equipment, system). More precisely, this work deals with the development of measurement and modeling methodologies for the characterization of the conducted immunity of complex ICs, such as microcontrollers and non-volatile memories. The main goal is to study the effect of component and/or board replacement on the electromagnetic behavior of a complete electronic system. In this context, a thorough study of the Direct Power Injection (DPI) technique is presented, thus validating its use for complex integrated circuits. Based on this study, a new prototype for the disturbance coupling path is proposed. It consists of a multiplexer that enables the superposition of a disturbance signal and a functional one with overlapping frequency bands. Therefore, it is possible to disturb an IC functional pin (a clock for instance) during its operation. Moreover, measurement procedure for conducted immunity is introduced. Its advantage is to make it possible to characterize the immunity of complex ICs by taking into account different operation modes as well as flexible immunity criteria (electrical / functional). Thanks to the application of this methodology for two different, non-volatile, pin-to-pin-compatible memories (having the same characteristics but different manufacturers), the influence of fabrication technology on the conducted immunity of such ICs is better identified and understood. As a consequence, the effect of changing components on the electromagnetic behavior of an electronic system has become predictable. As far as modeling aspects are concerned, two methodologies are presented in this manuscript. The first one deals with the immunity at the component level whereas the other involves board level immunity. At the IC level, the modeling approach is rather based on the ICIM-CI (lntegrated Circuit Immunity Model-Conducted Immunity) draft standard which makes it possible to extract simulation models that can be incorporated within IC design flows. Once applied to the context of non-volatile memories, this approach allows predicting their immunity in the case of modified input impedance, for example. As far as immunity modeling at the board level is concerned, the idea is to make use of ICIM-CI models corresponding to different ICs on the PCB in order to construct an Electronic Board Immunity Model for Conducted Immunity (EBIM-CI). A case study has been defined and the extracted model makes it possible to simulate the demonstrator's global conducted immunity as well as to predict its electromagnetic behavior following the replacement of one or more components.

Main thesis objective is in social network analysis. Theoretic will describe their origin, development and circumstances under which certain social networks were built. Part with analysis will concern in how to compete with business rivals using CI and will search techniques for proper facebook usage as a company's CI tool by rating of chosen fan facebook pages.

DevOps and continuous practices are increasingly popular development practices aiming at bridging the gap between software development and IT operations with the indented outcome of shorter development life cycles while maintaining a high software quality. A fundamental part of many DevOps systems is a CI/CD (continuous integration/deployment) pipeline allowing for automatic building, testing and deployment of software. The use of continuous practices have been shown to achieve the desired outcomes, whereas the adopting of such practices has been attributed with the challenges of lacking expertise and skill as well as lacking available tools and technology. Execution of commands in a CI/CD pipeline are handled by a runner application, which can be configured in different ways allowing for different levels of the quality attributes performance, response time, throughput, robustness, stability, resource constraints, cost and maintainability. Five different types of runner infrastructure were implemented and evaluated on the quality attributes. These were: one single-machine implementation, one serverless implementation and three autoscaling implementations. For robustness and stability autoscaling implementations achieved the best results. Performance and throughput were affected by resource constraints which in turn affected the cost. Similar results were found for response time for all but one of the three autoscaling implementations, and for the serverless implementation. Finally, all implementations had similar results for reliability.

No description available.

Made available in DSpace on 2015-04-14T14:12:17Z (GMT). No. of bitstreams: 1 330257.pdf: 910919 bytes, checksum: 7332e90853f969e714cf93b7ce78e481 (MD5) Previous issue date: 2005-03-30 / Este trabalho trata da import?ncia dos laborat?rios de Ci?ncias para alunos das s?ries iniciais. Foram acompanhadas todas as aulas das turmas de terceira s?rie do Ensino Fundamental ocorridas nos laborat?rios de F?sica, de Qu?mica e de Biologia de uma escola privada. Ap?s, foram realizados question?rios e entrevistas com professores e alunos dessa s?rie para detectar aspectos positivos e negativos dessas atividades e suas repercuss?es. Foi poss?vel verificar que as aulas ocorridas nos laborat?rios de Ci?ncias s?o de grande import?ncia na vida escolar dos estudantes e que elas devem ser proporcionadas aos alunos desde as s?ries iniciais, nas quais os conceitos de Ci?ncias come?am a ser apresentados e constru?dos pelos alunos

Made available in DSpace on 2015-04-14T14:12:44Z (GMT). No. of bitstreams: 1 428083.pdf: 1140524 bytes, checksum: c54d4f64571ee88f70bcc304451fd467 (MD5) Previous issue date: 2010-03-31 / Diversos pesquisadores v?m estudando os resultados cognitivos e afetivos das experi?ncias de visitas de grupos escolares aos museus de ci?ncias, assim como os fatores que ampliam a experi?ncia de aprendizagem nestes espa?os de educa??o n?o-formal. No entanto, poucas investiga??es t?m analisado o papel do professor na iniciativa de realiza??o de uma visita ao museu com seu grupo de alunos. Este trabalho se prop?e a investigar as percep??es dos professores que visitam o MCT-PUCRS com seus alunos, sob a ?tica do processo de constru??o de significados da experi?ncia museal, dentro do contexto pessoal do professor, analisando suas expectativas, motiva??es, estrat?gias e conex?es pretendidas entre a visita ao museu e o ensino de ci?ncias na escola. A pesquisa foi orientada por uma abordagem quantitativa e qualitativa, com entrevistas feitas com os professores visitantes. Os discursos foram analisados utilizando a an?lise discursiva textual. Os resultados mostram que os professores, em sua maioria, freq?entam o museu anualmente e suas primeiras experi?ncias de visita remetem a mem?rias de sua adolesc?ncia, como alunos da educa??o b?sica ou superior, sempre marcadas por emo??es positivas e pelo encantamento. Os professores revelam motiva??es intr?nsecas para a visita, como a amplia??o de conhecimentos e uma forma??o continuada, assim como justificativas ligadas ao crescimento e aprendizagem dos alunos. Motiva??es extr?nsecas, como atividades planejadas pela escola s?o utilizadas por uma minoria. As expectativas dos professores est?o diretamente relacionadas ?s suas motiva??es, incluindo modifica??es em sua pr?tica docente. O prazer e divers?o esperados na visita n?o est?o desvinculados da aprendizagem, assim como a amplia??o do interesse e a curiosidade dos alunos em ci?ncias e a complementa??o de conte?dos. Sobre as pr?ticas de visitas dos professores e suas perspectivas de rela??o com o ensino formal, encontra-se uma grande diversidade de op??es de escolha e controle das atividades dos alunos, que revelam diferentes concep??es de aprendizagem. As atividades planejadas no retorno ?s escolas, relacionadas ? visita??o, incluem relatos orais e escritos e organiza??o de mostras ou feiras de ci?ncias. Todos esses mecanismos de avalia??o p?s-visita mostram uma preocupa??o com a preserva??o e contextualiza??o da experi?ncia museal em outros contextos, como na escola. Os resultados da pesquisa mostram que o Modelo Contextual de Aprendizagem, de Falk e Dierking (2000), apresenta-se como uma base te?rica ?til na organiza??o e an?lise das investiga??es sobre a aprendizagem em espa?os de educa??o n?o formal.