Zugl.: Göttingen, Univ., Diss.

Im Rahmen der Dissertation wurde eine Fertigungstechnologie entwickelt, die die Überleitung des Stahlniederdruckgießverfahrens (3CAST) in die Produktion und somit die Erzeugung des dünnwandigen Stahlgusses ermöglicht. Die konventionellen Stahlgusswerkstoffe sowie ihre Gießbarkeit und Wärmebehandlung wurden untersucht und an die Besonderheiten des neuen Verfahrens und dünnwandigen Stahlgusses angepasst. Auf der Basis von schon existierenden Gießtechnologien wurde eine Formträgertechnologie (FTTech) entwickelt, die unter Berücksichtigung ökologischer Aspekte eine hohe Gussteilqualität und Wirtschaftlichkeit des Gießverfahrens sichert. Die gewonnen Ergebnisse wurden anhand eines Formträgerprototyps unter produktionsnahen Bedingungen erfolgreich erprobt. Somit ist eine Grundlage für den bei der Fa. Evosteel GmbH geplanten Aufbau der Fertigungstechnologie zur Serienproduktion von komplexen dünnwandigen Stahlgussteilen geschaffen.:1 Einleitung 2 Stand der Technik „Fertigung dünnwandiges Stahlgusses“ 2.1 Stahlgusswerkstoffe 2.2 Metallurgische Erzeugung 2.3 Gießtechnologie 2.3.1 Schwerkraftguss 2.3.2 Gegenschwerkraftguss 2.3.3 Druckguss 2.3.4 Schleuderguss 2.4 Formtechnologie 2.4.1 Dauerformen 2.4.2 Verlorene Formen 2.4.2.1 Tongebundene Formen 2.4.2.2 Technologie der kalthärtenden Formstoffe 2.4.2.3 Technologie der warmhärtenden Formstoffe 2.4.2.4 Feinguss 2.4.2.5 Vollformguss 2.4.2.6 Vakuumformverfahren 2.4.3 Stützschalenverfahren 2.5 Wärmebehandlung 2.6 Dünnwandiger Stahlguss 2.6.1 Erzeugung 2.6.2 Anwendungsgebiete 3 Aufgaben und Zielstellung der Arbeit 4 Werkstoffentwicklung 4.1 Werkstoffauswahl 4.2 Probenentwicklung 4.3 Untersuchung des Erstarrungs- bzw. Abkühlungsvorganges 4.3.1 Versuchsdurchführung 4.3.2 Ergebnisse der Untersuchung 4.3.3 Diskussion der Ergebnisse 4.4 Wärmebehandlung und Ermittlung mechanischer Eigenschaften 4.4.1 Versuchsdurchführung 4.4.2 Ergebnisse der Untersuchung 4.4.3 Diskussion der Ergebnisse 5 Entwicklung der Formtechnologie 5.1 Konzepterarbeitung 5.1.1 Kernpaket 5.1.2 Formträger 5.1.3 Konturnaher Formträger 5.1.4 Formträger mit Formhinterfüllung 5.2 Vorversuch 5.2.1 Versuchsdurchführung 5.2.2 Ergebnisse der Untersuchung 5.2.3 Diskussion der Ergebnisse 5.3 Entwicklung des Formträgerprototyps 5.3.1 Konstruktion des Formträgerprototyps 5.3.2 Erprobung des Formträgerprototyps 5.3.3 Ergebnisse der Untersuchung 5.3.4 Diskussion der Ergebnisse 5.4 Formstoffentwicklung 5.4.1 Untersuchungen zur Einsetzbarkeit verschiedener Formgrundstoffe 5.4.1.1 Untersuchte Formgrundstoffe 5.4.1.2 Eigenschaften der untersuchten Formgrundstoffe 5.4.1.3 Diskussion der Ergebnisse 5.4.1.4 Gießtechnologische Untersuchungen 5.4.1.5 Ergebnisse der gießtechnologischen Untersuchungen 5.4.1.6 Diskussion der Ergebnisse 5.4.2 Untersuchungen zur Einsetzbarkeit verschiedener Bindersysteme 5.4.2.1 Cold-box-Verfahren 5.4.2.2 Resol-CO2-Verfahren 5.4.2.3 Beach-Box-Verfahren 5.4.2.4 Diskussion der Ergebnisse 5.5 Entwicklung des Formstoffüberzuges 5.5.1 Laboruntersuchungen 5.5.2 Gießtechnologische Untersuchungen 5.5.3 Diskussion der Ergebnisse 5.6 Entwicklung des Formhinterfüllmateriales 5.6.1 Vorversuch mit Formträgerprototyp 5.6.2 Diskussion der Ergebnisse 5.6.3 Entwicklung des Formhinterfüllmateriales 5.6.4 Diskussion der Ergebnisse 6 Wirtschaftliche Betrachtung der entwickelten Technologie 7 Beiträge zur Verbesserung der Umweltbedingungen 8 Zusammenfassung

Im naturwissenschaftlichen Unterricht werden Daten z.B. in Erkenntnisgewinnungsprozessen eingesetzt und somit ist hier auch die Evaluation von Daten wichtig. Es können Daten aus erster und zweiter Hand unterschieden werden, wobei die Unterscheidung auf Basis des Autoren und der Beteiligung an der Datenerhebung geschieht. Im Physikunterricht werden Schüler*innen mit Daten aus unterschiedlichen Quellen konfrontiert. Es wird angenommen, dass die Evaluation von Daten durch Schüler*innen als Glaubwürdigkeitsbewertung dieser Daten verstanden werden kann. Ergänzend zur Theorie wurde in einer Studie untersucht, welche Kriterien Schüler*innen bei der Evaluation unterschiedlicher Datensätze verwenden, die sich nur durch den Autor unterschieden. Dafür wurden 17 Interviews mit Schüler*innen durchgeführt (13-16 Jahre). Eine qualitative Inhaltsanalyse führte zu einem Codesystem mit vier Codes und diversen Subcodes. Die Codes bezogen sich auf die Themen Eigenschaften des Experiments, Eigenschaften von Autoren, Eigenschaften der Daten und Prüfen/Abgleichen. Unterschiede in der Verwendung der Kriterien für verschiedene Datentypen, wurden in einer zweiten Studie überprüft. Dazu wurden 42 Interviews mit schüler*innen (14-16 Jahre) durchgeführt. Alle Probanden erzeugten selbstständig physikalische Daten und wählten Hypothesen über den Ausgang des Experiments aus. Im Anschluss wurden sie mit einem von drei verschiedenen Datensätzen konfrontiert: ihren eigenen Daten, den Daten eines anderen Schülers oder Daten eines Lehrers. Das Codesystem war die Grundlage einer quantitativen Inhaltsanalyse dieser Interviews. Diese erlaubte es, Unterschiede zwischen den Versuchsgruppen zu finden. Es ergaben sich keine Unterschiede für das Hypothesenwechselverhalten, die Verwendung von Kriterien für die Glaubwürdigkeitsbewertung oder das Rating der Wichtigkeit der Codes zwischen den Versuchsgruppen. Folgerungen für den Unterricht und die Unterscheidung der Datentypen werden erläutert. / In science education data is used in the process of gaining knowledge and it is therefore important to evaluate the data. First- and second-hand-data can be differentiated, whereby the distinction is based on the authorship and the involvement in the data acquisition. In physics education students are regularly confronted with data from different sources. It is assumed that the evaluation of data by students can be understood as the evaluation of the datas credibility. To complement a theoretical model, an interview study was conducted to find out which criteria for the evaluation of the credibility of data are used by students when evaluating different types of data. 17 students (13-16 years) were interviewed. A qualitative content analysis yielded a systems of four different codes and several subcodes. These codes where representations of statements that dealt with properties of the experiment, properties of the author, properties of the data, and testing and comparing. A second study was conducted to test if there are differences in the use of those criteria when students are confronted with different types of data. 42 Interviews with students (14-16 years) were conducted. All subjects acquired a set of first-hand data in an experiment and where asked to choose between 3 hypotheses about the outcome. Afterwards they were confronted with three different sets of data: their own data, another student's set of data, and a teacher's set of data. The system of codes from the previous study was used as the basis for a quantitative content analyses of these interviews. This analysis made it possible to find differences between the experimental groups. No differences were found for the change of the hypothesis, the use of criteria for the evaluation of credibility or the rating of importance of the codes. Implications for education and the differentiation of types of data are discussed.

The poems of Mignon have inspired song writers for almost two centuries. They have served as the texts for more composers than almost any other single set of poetry. The Romantic composers were especially fond of the words. The poems are full of sadness and yearning and composers found they could be set in different moods. Some settings are in major tonalities while other settings of the same poem can be found in minor. Simple harmonies are used in some settings while others contain more complex harmonies. There are those composers who would have Mignon appear as a lost soul throughout all the poems with each song quietly sung, while others use a variety of dynamics adding drama to the setting and picturing Mignon as full of optimism at the end.

Made available in DSpace on 2014-12-17T15:41:53Z (GMT). No. of bitstreams: 1 ViniciusPSC_DISSERT.pdf: 2657914 bytes, checksum: beb97c8aaf506ef6b97930de865d3dd2 (MD5) Previous issue date: 2011-02-25 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / The catalytic processes play a vital role in the worldwide economy, a business that handles about US$ 13 billion per year because the value of products depends on the catalytic processes, including petroleum products, chemicals, pharmaceuticals, synthetic rubbers and plastics, among others. The zeolite ZSM-5 is used as catalyst for various reactions in the area petrochemical, petroleum refining and fine chemicals, especially the reactions of cracking, isomerization, alkylation, aromatization of olefins, among others. Many researchers have studied the hydrothermal synthesis of zeolite ZSM-5 free template and they obtained satisfactory results, so this study aims to evaluate the hydrothermal synthesis and the physicochemical properties of ZSM-5 with the presence and absence of template compared with commercial ZSM-5. The methods for hydrothermal synthesis of zeolite ZSM-5 are of scientific knowledge, providing the chemical composition required for the formation of zeolitic structure in the presence and absence of template. Samples of both zeolites ZSM-5 in protonic form were obtained by heat treatment and ion exchange, according to procedures reported in the literature. The sample of commercial ZSM-5 was acquired by the company Sentex Industrial Ltda. All samples were characterized by XRD, SEM, FTIR, TG / DTG / DSC, N2 adsorption and desorption and study of acidity by thermo-desorption of probe molecule (n-butylamine), in order to understand their physicochemical properties. The efficiency of the methods applied in this work and reported in the literature has been proved by well-defined structure of ZSM-5. According as the evaluation of physicochemical properties, zeolite ZSM-5 free template becomes promising for application in the refining processes or use as catalytic support, since its synthesis reduces environmental impacts and production costs / Os processos catal?ticos desempenham um papel vital na economia mundial, um neg?cio que movimenta aproximadamente US$13 bilh?es por ano, pois o valor dos produtos depende dos processos catal?ticos, incluindo os produtos petrol?feros, qu?micos, farmac?uticos, borrachas sint?ticas e pl?sticos, entre outros. A ze?lita ZSM-5 ? utilizada como catalisador em rea??es nas ?reas petroqu?mica, petrol?fera e qu?mica fina, destacando-se as rea??es de craqueamento, isomeriza??o, alquila??o, aromatiza??o de olefinas, entre outras. Muitos pesquisadores t?m estudado a s?ntese hidrot?rmica da ze?lita ZSM-5 ausente de direcionador org?nico estrutural e obtiveram resultados satisfat?rios, assim, este estudo visa avaliar a s?ntese hidrot?rmica e as propriedades f?sico-qu?micas da ZSM-5 com a presen?a e aus?ncia de direcionador org?nico estrutural, em compara??o com ZSM-5 comercial. Os m?todos para a s?ntese hidrot?rmica da ze?lita ZSM-5 s?o de conhecimento cient?fico, fornecendo a composi??o qu?mica necess?ria para a forma??o da estrutura zeol?tica em presen?a e aus?ncia de direcionador org?nico estrutural. As amostras de ambas as ze?litas ZSM-5 na forma prot?nica foram obtidas atrav?s de tratamentos t?rmicos e troca i?nica, de acordo com procedimentos relatados na literatura. A amostra de ZSM-5 comercial foi concedida pela empresa Sentex Industrial Ltda. Todas as amostras foram caracterizadas por DRX, MEV, FTIR, TG/DTG/DSC, Adsor??o e dessor??o de N2 e estudo da acidez por termodessor??o de mol?cula sonda (n-butilamina), a fim de compreender suas propriedades f?sico-qu?micas. A efici?ncia dos m?todos aplicados no presente trabalho e relatados na literatura foi comprovada pela estrutura bem definida da ze?lita ZSM-5. Conforme a avalia??o das propriedades f?sico-qu?micas, a ze?lita ZSM-5 ausente de direcionador org?nico torna-se promissora para aplica??o em processos de refino ou utiliza??o como suporte catal?tico, visto que, sua s?ntese reduz os impactos ambientais e custos de produ??o

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Made available in DSpace on 2014-12-17T14:20:17Z (GMT). No. of bitstreams: 1 LeninaLSS_TESE.pdf: 2389924 bytes, checksum: be98cf3c8ee6fa1fe09ca9da91183afc (MD5) Previous issue date: 2010-11-30 / This thesis is a translation of work of the Brazilian doctor, Pedro da Silva Nava (1903-1984), in particular, his memoirs and chronicles, articulated with the writings of medicine history, aiming to defend that the autobiographical narratives are sources of research capable of promoting discussions on the expansion of the present at the confluence of complex and unequal society in constant changing process as the Brazilian. The theoretical and methodological support circulates around studies, proposals and thesis by Boaventura Santos about empowering past, destabilizing subjectivity, sociology of absences, cosmopolitan reason and translation work. The empirical support drawn from the literature produced by Nava were analyzed with reference this reasoning and studies that have facilitated the flow of translation among others, the studies of Antonio Candido, Arrigucci Jr., Boris Cyrulnik, Beatriz Sarlo, Ecl?a Bosi, ?talo Calvino, Jos? Willington Germano, Jos? Maria Can?ado, Lev Vygotsky, Marilena Chau?, Paul Ric?eur and Walter Benjamim, without neglecting what we consider indispensable to scientific research, the production of relevant knowledge and prudent, in view of a decent life. The initial inflections reflect the subject of the Memoirs and its education/training, to then place the Memoir subject in the literary context, scientific, historical and Brazilian poetic (1972-2010), bringing great interpreters and discussing the rationale used by the Narrator that we defend stand closer to the cosmopolitan, showing the formation of narratives whose presence insert itself beforehand to modernist verve, linked to the discursive array against the literature as domination space, disseminated in Brazil in the early twentieth century. So, it articulate with those in which the concerns adjust the construction of the social formation of Brazil as a national heritage through literary narrative that focuses on a historical principle that becomes the past empowering, allowing his rereading, whose converge to memory, the lifestyles, the plurality of language and Brazilian culture, formed by several people, converging into a design not of culture but multiculturalism in Brazil. The memory issue was addressed in the space-time of experiences of being that narrates, shaped by a destabilizing subjectivity that sought to order the testimony of a time, a history and society, retelling them by creative imagination, almost fictional, to make circulate his knowledge about Brazil attached to his medical knowledge, as well as other subjects in his living group and other groups with whom they maintained contact. Thus, he portrayed both tangible and intangible cultural assets of the country as a form of preservation, giving them meanings and sense. It approaches, therefore, from the perspective of sociology of absences, the expansion of the present and by the logic inherent in his narratives of self and Brazil / Consiste, este trabalho de tese, de uma tradu??o da obra do m?dico brasileiro, Pedro da Silva Nava (1903-1984), em particular, de seus escritos memorial?sticos e das cr?nicas, articulados com os de hist?ria da medicina, objetivando-se defender que as narrativas autobiogr?ficas s?o fontes de pesquisas capazes de promover discuss?es sobre a dilata??o do presente na conflu?ncia de uma sociedade desigual e complexa, em constante processo de mudan?a, como a brasileira. A fundamenta??o te?rica e metodol?gica circula no entorno dos estudos, propostas e teses de Boaventura Santos sobre passado capacitante, subjetividade desestabilizadora, sociologia das aus?ncias, raz?o cosmopolita e trabalho de tradu??o. As bases emp?ricas, extra?das da literatura produzida por Nava, foram analisadas tendo como referentes esta fundamenta??o e estudos que possibilitaram o fluir da tradu??o, entre outros, de Antonio Candido, Arrigucci Jr., Boris Cyrulnik, Beatriz Sarlo, Ecl?a Bosi, ?talo Calvino, Jos? Willington Germano, Jos? Maria Can?ado, Lev Vygotsky, Marilena Chau?, Paul Ric?eur e Walter Benjamim, sem descurar daquilo que consideramos imprescind?vel ? pesquisa cient?fica, ? produ??o de conhecimentos prudentes e pertinentes, na perspectiva de uma vida decente. As inflex?es iniciais traduzem o sujeito das Mem?rias e sua educa??o/forma??o, para, em seguida, situar as Mem?rias do sujeito no contexto liter?rio, cient?fico, hist?rico e po?tico brasileiro (1972-2010). Trazem seus principais int?rpretes, discutindo a racionalidade empregada pelo Narrador, que defendemos aproximar-se da cosmopolita, evidenciando a constitui??o de narrativas cujas presen?as inserem-se de antem?o ? verve modernista, vinculada ? matriz discursiva contr?ria ? literatura como espa?o de domina??o, disseminada no Brasil no in?cio do S?culo XX. Desse modo, articula-se ?quela na qual as preocupa??es conformam a constru??o da forma??o social do Brasil, como patrim?nio nacional, atrav?s da narrativa liter?ria com enfoque em um princ?pio hist?rico que torna o passado capacitante. Permite, assim, sua releitura, para cujas tramas convergem ? mem?ria, os modos de vida, a pluralidade da linguagem e da cultura brasileira, formada por v?rios povos, confluindo para uma concep??o, n?o de cultura, mas de multiculturalidade brasileira. A quest?o da mem?ria foi tratada no espa?otempo das experi?ncias do ser que narra, moldado por uma subjetividade desestabilizadora que buscou ordenar os testemunhos de um tempo, de uma hist?ria e de uma sociedade, recontando-os pela imagina??o criadora, quase ficcional, para fazer circular seus conhecimentos sobre o Brasil, unidos aos seus conhecimentos m?dicos, bem como aos de outros sujeitos de seu grupo de conviv?ncia e de outros grupos com os quais manteve contato. Assim, retratou bens culturais materiais e imateriais do pa?s como forma de preserva??o, atribuindo-lhes significados e sentidos. Aproxima-se, portanto, da perspectiva de sociologia das aus?ncias, pela dilata??o do presente e pelas l?gicas a ela inerentes em suas narrativas de si e do Brasil

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