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Kolesár, Roman. "Optimalizace technologií vosků a skořepin ve firmě Fimes." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231531.
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The thesis continue thematically in the previous development of the wax mixtures for the company Fimes. The general description of the investment casting process from the production of the die to casting of the wax pattern is handled in the first part. It is followed by the summary of the previously carried out experiments on cracking the shells. The experimental part describes the individual operations from the production of tested wax patterns to casting in the Boilercláv. The newly developed wax mixture is compared to the wax mixture used by the company Fimes. The experiments focus on the possibility of cracking the shells during the casting process and the dimensional stability of wax mixtures.
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Žuja, Jaroslav. "Optimalizace technologie výroby voskových modelů ve firmě Fimes." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232109.
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This thesis is to evaluate currently used wax and compare its properties with of newly purchased one. Further, it is to evaluate whether the quality is reflected by using "boiled wax'', which is being used as a runner wax. All tests were carried out at the Fimes a. s. In the first part of this thesis, there is a brief description of the lost wax method. This is followed by a decription of wax blends from technology point of view. The experimental part describes the operations from the production of wax patterns, through their dimensional inspection, up until dewaxing process. All the results are noted and compared.
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ASSIS, Ita de Fátima Silva. "O Caminho entre o Público e o Privado: Um Estudo de Contextualização da FIMES." Universidade Federal de Goiás, 2008. http://repositorio.bc.ufg.br/tede/handle/tde/2053.
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Previous issue date: 2008-12-02This study, which has as theme The path between the public and the Private: a study of the FIMES context , is settled in the Research area: State and Educational Policies of the Postgraduate Program in Education, Federal University of Goiás. It discusses and investigates the administrative classification and the legal nature of the educational institutions of Higher Education and, especially, the Fundação Integrada Municipal de Ensino Superior - FIMES, in relation to the public and private category. The research has as main objectives to reconstitute the FIMES history and to analyze the public/private relationship which permeates the origin of the Institution. The following research issues are raised: How has the sustainability of FIMES been planned since its origin? The higher education institutions which were created by the municipal public power but are not kept by it, are considered public or private? The theoretical-methodological reference focuses the educational legislation, both Brazilian and from the state of Goiás, as well as authors who have contributed to the debate related to educational policies, mainly those related to the politics which consolidates the public and the private relationship in the higher education. The investigation relies on the qualitative research, with the support of document analysis as well as semi-structured interviews, which were carried out with the subjects, who were involved with the project of the creation of FIMES: its idealization, settlement as an institution and the first years it operated. When bringing the institution history, the dilemma lived by FIMES is presented, since its origin, emphasizing the latest years, from 2006 on, in relation to the public/private category and the ways of financing the institution. A few possibilities are identified and analyzed using the current legislation, so as to solve this legal/institutional deadlock, which, however, depends on the decision of the Municipal Public Power, once the Institution was created by a municipal law, but it is maintained, among other projects, by students tuition.
A presente pesquisa, cujo tema é O Caminho entre o Público e o Privado: um Estudo de Contextualização da FIMES, situa-se na Linha de Pesquisa: Estado e Políticas Educacionais, do Programa de Pós-Graduação em Educação, da Universidade Federal de Goiás. Problematiza e investiga a classificação administrativa e a natureza jurídica das fundações educacionais de ensino superior e, de modo especial, a Fundação Integrada Municipal de Ensino Superior - FIMES, em relação à categoria público e privado. A pesquisa tem como objetivos principais reconstituir a história da FIMES e analisar a relação público/privado que permeia a origem da Instituição. Levanta-se como problema de pesquisa o seguinte questionamento: como foi planejado a sustentabilidade da FIMES desde sua origem? As fundações educacionais de ensino superior, criadas pelo poder público municipal, mas não mantidas por ele, são públicas ou privadas? O referencial teórico-metodológico focaliza a legislação educacional, brasileira e goiana, bem como autores que têm contribuído para o debate acerca das políticas educacionais, principalmente, relativos à política que consolida a relação público e privado no ensino superior. A investigação pauta-se na pesquisa qualitativa, subsidiada pela análise documental e entrevistas semi-estruturadas, colhidas junto aos sujeitos, todos eles envolvidos com o projeto de criação da FIMES: a sua idealização, implantação como fundação e primeiros anos de funcionamento. Na historicização da fundação, apresenta-se o dilema vivido pela FIMES, desde a sua origem, ressaltando-se os últimos tempos, ou seja, a partir de 2006, com relação à categoria público/privado e as formas de financiamento da Instituição. Identificam-se e analisam-se algumas possibilidades, perante a legislação vigente, para a solução desse impasse jurídico/institucional, o que, no entanto, depende de decisão do Poder Público Municipal, uma vez que a Fundação foi criada por lei municipal, mas é mantida, dentre outros projetos, por mensalidades de alunos.
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Caetano, Karine dos Santos. "Utilização de amido, óleo de orégano e extrato de resíduo de abóbora para o desenvolvimento de fimes biodegradáveis ativos." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/147641.
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O impacto ambiental causado por materias plásticos utilizados como embalagem e a grande quantidade de resíduos gerados pela indústria de alimentos, é uma crescente preocupação. Como alternativa para reduzir os problemas de disposição de resíduos e o uso excessivo de materiais não biodegradáveis, têm-se realizado diversas pesquisas sobre o desenvolvimento de filmes a partir de biopolímeros e de resíduos alimentares ou a combinação destes. Os filmes produzidos podem ser utilizados para substituir parcialmente o uso de plástico não biodegradável e representam uma alternativa para agregar valor a materiais até então subutilizados com redução do consumo de materiais provenientes de fontes não renováveis. Neste contexto, desenvolveu-se um filme biodegradável com propriedades antioxidantes e antimicrobianas a partir do amido de mandioca e adição de óleo essencial de orégano e extrato de resíduo de abóbora. Os filmes foram caracterizados quanto a suas propriedades físico-químicas, mecânicas, de barreira e antioxidantes (DPPH). De acordo com os resultados obtidos, foram selecionados os melhores filmes, e caracterizados quanto suas propriedades óticas, térmicas e antimicrobianas. Posteriormente, foram selecionadas duas formulações para o teste de proteção contra oxidação em carne moída e uma formulação para avaliar o efeito do filme em carne moída em relação à atividade antimicrobiana contra coliformes, mesófilos e Salmonella. A adição do extrato do resíduo de abóbora teve efeito na cor e na opacidade dos filmes, e o óleo essencial de orégano teve efeito positivo na atividade antioxidante avaliada pelo método de captura do radical DPPH. O óleo e o glicerol provocaram aumento na elongação e uma redução na resistência à tração dos filmes. As formulações com as maiores concentrações de extrato e óleo essencial apresentaram atividade antioxidante acima de 45% de inibição do radical DPPH. Nos testes de atividade antimicrobiana, os filmes de formulação 8 (4,8% de extrato, 1,6% de óleo, 1,76% de glicerol, 4% de amido de mandioca) e 12 (3% de extrato, 2% de óleo, 1,7% de glicerol e 4% de amido de mandioca) foram efetivos contra Escherichia coli, Stafilococus aureus e Listeria monocytogenes. Em relação à aplicação dos filmes em carne moída, o filme ativo (2% de óleo e 3% de extrato) foi efetivo no retardo da oxidação do produto embalado. Os filmes ativo e o filme controle (sem adição de óleo e extrato) foram efetivos até o terceiro dia de armazenamento contra a multiplicação de coliformes e mesófilos. O filme ativo foi mais efetivo na redução da contagem de coliformes comparado com o filme controle e a carne sem filme. No teste de multiplicação de Salmonella Enteritidis, o filme ativo apresentou menor contagem no dia 6 quando comparado com o filme controle o que demonstra sua efetividade para uso na manutenção da qualidade microbiológica de carnes. De modo geral, os filmes produzidos se mostraram como uma alternativa de embalagem ativa biodegradável para o uso em alimentos.The environmental impact, caused by waste plastic material used as packaging and the large amount of waste generated by the food industry, is a growing concern. As an alternative to reduce the waste disposal problem and the excessive use of non-biodegradable materials, many studies are being conducted in order to develop biodegradable films from biopolymers and food waste or a combination of both. The films produced may be used to partially replace the use of non-biodegradable plastic material, in this way emerging as an alternative to add value to materials so far underutilized and reduce the consumption of materials from non-renewable sources. In this context, it was developed a biodegradable film with antioxidant and antimicrobial properties from cassava starch with addition of pumpkin residue extract and oregano essential oil. The films were characterized based on physico-chemical, mechanical, barrier and antioxidant (DPPH) properties. According to the results, the best films were selected and characterized upon their optical, thermal and antimicrobial properties. From these results, two formulations were selected for the protection against oxidation test which was conducted on ground beef and one formulation to evaluate the film antimicrobial activity against coliforms, mesophiles and Salmonella on ground beef. It was observed that the addition of pumpkin residue extract had effect on the color and opacity of the films, and the oregano essential oil had a positive effect on the antioxidant activity of the films evaluated by the DPPH radical capture method. The oil and glycerol caused an increase in elongation and a reduction in films tensile strength. In the antimicrobial activity test, the films formulation 8 (4.8% extract, 1.6% oil, 1.76% glycerol, 4% cassava starch) and 12 (3% extract, 2% oil, 1.7% glycerol and 4% cassava starch) were effective against Escherichia coli, Stafilococus aureus and Listeria monocytogenes. Regarding the application of the films on ground beef, the active film (2% oil and 3% extract) was effective in delaying the meat oxidation. The active film and the control film (without oil and extract) were effective until the third day of storage against the coliforms and mesophiles multiplication. The active film was more effective in reducing coliform count compared to the control film and meat without film. In Salmonella Enteritidis multiplication test, the active film showed a lower count on the 6th day when compared to the film control which demonstrates its effectiveness when used to maintain the meat microbiological quality. In general terms, the films produced have proved suitable as an alternative biodegradable active packaging to be used on food.
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Gibelli, Edison Bessa. "Preparação e caracterização de dispositivos eletroluminescentes de complexos de β-Dicetonatos de íons Tb3+, Eu3+, Gd3+ com ligantes macrocíclicos e fimes de UO22+." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-01082011-102139/.
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Complexos contendo íons de terras raras são de grande interesse na fabricação de dispositivos eletroluminescentes como é o caso do diodo emissor de luz construído com compostos orgânicos (OLED). Esses dispositivos, utilizando íons de terras raras trivalentes (TR3+) como centros emissores, exibem alta luminescência com bandas espectrais extremamente finas devido à estrutura dos seus níveis de energia, tempos de vida longos e a alta eficiência quântica. Este trabalho relata a preparação de complexos de β-dicetonatos (tta - tenoiltrifluoroacetonato e acac - acetilacetonato) de terras raras (Tb3+, Eu3+ e Gd3+) contendo ligante macrocíclico éter coroa (DB18C6 - dibenzo18coroa6) e de filmes poliméricos de UO22+. Os materiais obtidos foram caracterizados por titulação complexométrica com EDTA, análise elementar de CH, espectroscopia de absorção na região do infravermelho, análise termogravimétrica, difratometria de raios X (método do pó) e espectroscopia de luminescência. Na manufatura do dispositivo OLED construído neste trabalho utilizou-se a técnica de deposição física de filmes finos por fase vapor (PVD, Physical Vapor Deposition).Complexes containing Rare Earth ions are of great interest in the manufacture of electroluminescent devices as organic light emitting devices (OLED). These devices, using rare earth trivalent ions (TR3+) as emitting centers, show high luminescence with extremely fine spectral bands due to the structure of their energy levels, long life time and high quantum efficiency. This work reports the preparation of Rare Earth β-diketonate complexes (Tb3+, Eu3+, Gd3+) and (tta - tenoyltrifluoroacetonate and acac - acetylacetonate) containing a ligand macrocyclic crown ether (DB18C6 - dibenzo18coroa6) and polymer films of UO22+. The materials were characterized by complexometric titration with EDTA, CH elemental analysis, near infrared absorption spectroscopy, thermal analysis, X-ray diffraction (powder method) and luminescence spectroscopy. For manufacturing the OLED it was used the technique of deposition of thin films by physical vapor (PVD, Physical Vapor Deposition).
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McNamara, Marjorie Schratz. "Simple Fires." NCSU, 2004. http://www.lib.ncsu.edu/theses/available/etd-02272004-204740/.
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"Suspended in Mid-Air while Looking under the Bed" begins and loosely foreshadows this collection of poetry and short stories. I am a storyteller, pulled by both family and place in my life. In this thesis, I play impresario and follow each short story with poems which resonate with that story. The first poems and short stories speak from places in my life: Ireland, Prague, and Malawi. Then my storytelling comes closer to family with a fictional account of my great-grandparents Wilhelm and Ana Krane, who immigrated to Allegheny City, Pennsylvania, in the 1880's. My story of family continues through relationships, reunions, my parents, and ends with the contemporary world when my translation of Charles Baudelaire merges into a poem about Iraq.
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Daminelli, Silvane. "Filmes legendados." reponame:Repositório Institucional da UFSC, 2014. https://repositorio.ufsc.br/xmlui/handle/123456789/129589.
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Tese (doutorado) - Universidade Federal de Santa Catarina, Centro de Comunicação e Expressão, Programa de Pós-Graduação em Estudos da Tradução, Florianópolis, 2014.Made available in DSpace on 2015-02-05T21:16:22Z (GMT). No. of bitstreams: 1 331450.pdf: 3515532 bytes, checksum: 6c2525f1e3c9601dbe45c2f50bcb7280 (MD5) Previous issue date: 2014
Esta pesquisa, à luz dos Estudos da Tradução e de estudos que permeiam o ensino e aprendizagem da leitura, objetiva examinar a contribuição de obras cinematográficas estrangeiras como perspectiva para o ensino da leitura, por meio da criação de espaços favoráveis e instigadores à formação de leitores proficientes, considerando a riqueza do texto fílmico, que constitui as obras cinematográficas. Este estudo tece reflexões sobre a possibilidade de produção de sentido a partir de textos fílmicos. Por essa razão, a revisão da literatura contempla discussões em torno dos Estudos da Tradução, legenda e ensino, ensino e aprendizagem da leitura; da relação entre cinema e ensino/educação. Com a finalidade de conduzir a investigação, após definição da população de pesquisa, 56 estudantes da rede pública de ensino, Escola de Educação Básica Pedro Simon, foi elaborada e implementada uma proposta pedagógica, cujo material para a coleta de dados consiste em quatro curtas-metragens: Os fantásticos livros voadores do senhor Morris Lessmore, O monge e o macaco, Batman, sem saída e A lenda do espantalho. Para a coleta de dados, foram aplicados três instrumentos: questões de acesso e compreensão da obra (questionário), devolutiva e protocolos verbais. O primeiro, trata-se de um questionário (GIL, 1999) composto por um número de questões apresentadas por escrito aos participantes da pesquisa. O segundo consiste na retomada das respostas às questões, possibilitando ao participante validar ou não a reposta (PEIXOTO, 1998) e o terceiro, protocolo verbal é o instrumento que possibilita a análise dos relatos verbais acerca da leitura fílmica. Este instrumento consiste na verbalização do pensamento, na descrição que o leitor faz de uma situação específica de leitura que acabou de fazer (TOMITCH, 2007, SOUZA; RODRIGUES, 2008). Os dados obtidos foram coletados e analisados com base nas respostas às questões, devolutiva e protocolo. O resultado das análises indicou desempenho satisfatório dos participantes validando, assim, a hipótese. Desta forma, o uso de filmes legendados em sala de aula promove o desenvolvimento e o aprimoramento das competências em leitura, no que diz respeito ao acesso e à compreensão das obras. A implementação da proposta pedagógica possibilitou, aos participantes, contato com obras cinematográficas estrangeiras. Consequentemente, observou-se que os participantes, ao ler as legendas, não apresentavam mais as dificuldades apresentadas no início da coleta de dados. Conclui-se que a produção de sentido, resultado da interação autor-leitor-texto (SOUZA, 2012), foi alcançada, confirmando que o uso de filmes legendados em sala de aula pode possibilitar a promoção, o desenvolvimento e o aprimoramento das competências em leitura.
Abstract : This research is based on studies that pervade the teaching and learning of reading. Thereat, it aims to analyze the contribution of foreign cinematographic works as a perspective to teaching reading that creates places which are propitious and instigating to the development of proficient readers, considering that the texts of films are rich. Besides, this study reflects about the possibility of producing sense from movie texts. For this reason, the literature review covers discussions about Translation Studies, subtitles and teaching, the teaching and learning of reading, as well as about the relation between cinema and education/teaching. In order to lead the investigation, one defined the research population with 56 students from a public school named Escola de Educação Básica Pedro Simon. Thus, a pedagogic proposal was formulated and implemented based on a material collected from four short films: "The Fantastic Flying Books of Mr. Morris Lessmore", "The monk and the monkey", "Batman dead end" and "La leyenda del espantapajaros". In collecting data, three instruments were applied: questions about comprehension and accessibility of work (questionare), returning and verbal protocols. The first one is a questionare (GIL, 1999) made of a given number of written questions presented to the participants of the research. The second one consists of the resumption of the answers, making it possible for the participant to validate her answer or not (PEIXOTO, 1998) and the third one is a verbal protocol that is the instrument that enables the analysis of the verbal reports about the filmic reading. This instrument consists in the verbalization of thought and the description the reader makes of a specific reading situation that just occurred (TOMITCH, 2007, SOUZA; RODRIGUES, 2008). The obtained data were collected and analyzed based on the answers given to the questions, on the returning and on the protocol. The result of the analysis showed a satisfactory performance of the participants, thus validating the hypothesis. Therefore, using movies with subtitles promotes the development and the upgrading of reading competence, especially in what concerns the accessibility and comprehension of the works. The implementation of the pedagogical proposal allowed the participants to establish contact with foreign cinematographic works. Hence, one could observe that, when reading the subtitles, the participants did not show the difficulties presented inthe beginning of data collecting. Besides, one can conclude that the constructing meaning is the result from the interaction author-reader-text (SOUZA, 2012) that was achieved. This confirmed the use of subtitled movies in the classroom can enable the promotion, the development and the upgrading of reading competences.
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曾嘉晴. "Ex files." HKBU Institutional Repository, 2008. https://repository.hkbu.edu.hk/etd_ra/901.
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Solman, Dario. "Air files." The Ohio State University, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=osu1318871694.
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Goodsell, Thea. "Mental files." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:7d7a1146-f770-4951-81a2-2b5dc42d2ecc.
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It is often supposed that we can make progress understanding singular thought about objects by claiming that thinkers use ‘mental files’. However, the proposal is rarely subject to sustained critical evaluation. This thesis aims to clarify and critique the claim that thinkers use mental files. In my introductory first chapter, I motivate my subsequent discussion by introducing the claim that thinkers deploy modes of presentation in their thought about objects, and lay out some of my assumptions and terminology. In the second chapter, I introduce mental files, responding to the somewhat fragmented files literature by setting out a core account of files, and outlining different ways of implementing the claim that thinkers use mental files. I highlight pressing questions about the synchronic and diachronic individuation conditions for files. In chapters three and four, I explore whether ‘de jure coreference’ can be used to give synchronic individuation conditions on mental files. I explore existing characterisations of de jure coreference before presenting my own, but conclude that de jure coreference does not give a useful account of the synchronic individuation conditions on files. In chapter five, I consider the proposal that thinkers must sometimes trade on the coreference of their mental representations, and argue that we can give synchronic individuation conditions on files in terms of trading on coreference. In chapter six, I bring together the account of files developed so far, compare it to the most developed theory of mental files published to date, and defend my account from the objection that it is circular. In chapter seven, I explore routes for giving diachronic individuation conditions on mental files. In my concluding chapter, I distinguish the core account of files from the idea that the file metaphor should be taken seriously. I suggest that my investigation of the consequences of the core account has shown that the file metaphor is unhelpful, and I outline reasons to exercise caution when using ‘files’ terminology.
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Sousa, Maria Isabel Afonso de Amaral e. "O consumo dos filmes e os filmes de consumo." Master's thesis, Faculdade de Ciências Sociais e Humanas, Universidade Nova de Lisboa, 1995. http://hdl.handle.net/10362/11504.
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Hoydicz, Jennifer. "The narc files /." Full text available online, 2006. http://www.lib.rowan.edu/find/theses.
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Page, Laura. "The glory files." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ52729.pdf.
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Olwell, David H., and Alan R. Washburn. "Internetting of fires." Monterey, California. Naval Postgraduate School, 2002. http://hdl.handle.net/10945/24462.
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Perry, Christopher Harton. "Synthesizing interactive fires." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/62329.
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Young, Elizabeth Anne. "Standardising Design Fires For Residential and Apartment Buildings: Upholstered Furniture Fires." Thesis, University of Canterbury. Civil and Natural Resources Engineering, 2007. http://hdl.handle.net/10092/1959.
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This purpose of this research was to develop a credible set of furniture design fires for
residential/apartment buildings and determine a methodology for incorporating compartment effects in
design fires. Design fires can be defined using various outputs, the most important being the HRR
profile, and depending on the application the following may also be relevant:
· Smoke production rates
· Soot yield
· Species production rates
· Temperature profiles
· Visibility
· Heat fluxes
· Mass loss rate of the fuel
· Flame spread
There were three phases to this project: The first phase of this project was a comprehensive data and
literature review to determine the amount of experimental data available and commonly accepted
burning characteristics for upholstered furniture; armchairs, 2-seater sofas, 3-seater sofas, beds and
bedding assemblies, and commonly accepted burning characteristics and compartment effects. A large
proportion of the review provided only qualitative guidance for design fires.
In the second phase the data collected during the review was collated and used to quantitatively
analyse key fire characteristics. These were
· peak HRR,
· time to peak HRR,
· growth rate,
· total heat released and
· maximum CO/CO2 ratio.
A methodology was developed to statistically analyse experimental data using BestFit, and where there
was sufficient data the 98th percentile of the statistical analysis was used as a quantitative guide for
furniture design fires. Similarly, compartment effects were incorporated into the design fires by
analysing and comparing the experimental data from free burn and room burn tests of the same
furniture item. The same statistical analysis was used to determine likely changes in the key fire
characteristics mentioned above.
A methodology for determining design fires for upholstered furniture was devised, however the small
number of data sets available for analysis meant the quantitative results were only indicative.
The third phase was to attempt to model furniture fires using FDS, which determined that at the time of
this project, FDS was not capable of modelling simple furniture fires accurately. The simulation results
varied significantly from the experimental results and a number of limitations were identified. Therefore
FDS should not be used to create design fires using the heat of combustion method, which relies on the
users’ definition of material properties.
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Vieira, Adalena Kennedy. "Desenvolvimento de processos de deposição de filmes filmes sobre substratos polimericos fotopolimerizdos." [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/266697.
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Orientador: Edison BittencourtTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Quimica
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Resumo: Em todo o mundo inicia-se uma nova era. A qualidade de vida e segurança dependem cada vez mais da capacidade de toda humanidade em resolver problemas cada dia mais complexos e demorados. Com o advento da comunicação e a globalização o tempo cada vez mais torna-se um bem escasso e precioso. Os materiais semicondutores usados para desempenhar as funções lógicas e de memória de alta velocidade utilizados no processamento de informação e hardware de armazenagem são os materiais mais difíceis de serem produzidos. Com relação a estes materiais nesta indústria, a capacidade de transformação é enorme, pois o que era o equipamento mais moderno num piscar de olhos passa a ser obsoleto. Assim, avanços nas áreas de tecnologias de informação estão relacionados a avanços em semicondutores e conseqüentemente em materiais. Conforme aumenta a funcionalidade dos chips, aumentam também substancialmente as alternativas para melhorá-los, porque a demanda por este produto não para de crescer e aumenta exponencialmente com relação à população que os consome. Para satisfazer à demanda por densidades mais elevadas nos chips, serão necessárias novas tecnologias de empacotamento e interconexão e a integração destas com toda a tecnologia microeletrônica. É, pois, neste contexto que se insere o presente trabalho. Um dos objetivos principais foi a obtenção de uma cobertura que pode ser um início de uma nova tecnologia para o desenvolvimento de um ¿microchip¿ sobre materiais poliméricos. É o nascer de uma nova era na área de materiais e dispositivos eletro-eletrônicos. Para a indústria nacional e para o Pólo Industrial de Manaus, talvez seja uma tecnologia de ponta com um material mais barato e acessível a todos. Para a execução deste trabalho foram feitos planejamentos experimentais visando melhorar as condições ¿ótimas¿ para o recobrimento por spin coating. Através da deposição de filmes de óxido de silício sobre lentes oftálmicas produziu-se os filmes de óxido de sílicio que foram depositados através de um reator de Microwave Electron Cyclotron Resonance, com o auxílio de um campo magnético em um plasma constituído por uma mistura de argônio, oxigênio e silana. Esse método de deposição é conhecido como ¿ECR¿. A estrutura dos filmes de óxidos de silício depositados foi estudada através de transmitância na região do visível. A morfologia das superfícies recobertas com os filmes foi analisada por Microscopia Óptica e também através de Microscopia de Varredura Eletrônica (MEV). Os resultados de transmitância para os filmes mostram que na medida em que a camada é depositada são formadas estruturas que melhoram a proteção oferecida pela cobertura. As micrografias ópticas revelaram que as lentes sofrem um ¿stress¿ em razão da diferença do coeficiente de expansão entre os dois materiais. As micrografias de MEV mostraram, também, que as superfícies melhores protegidas pelo óxido de silício são as obtidas através de fabricação e moldagem feita com resina acrílica, como comprovam os testes anti-risco. A análise de ângulo de contato do filme mostrou que a cobertura serve como camada aderente ao polímero, mas não como camada hidrofóbica, pois o polímero ainda assim absorve água. As medidas de parâmetros S encontradas foram tiradas com base nas características dos protótipos ensaiados e de acordo com as limitações da resposta em frequência do equipamento utilizado para o ensaio. O resultado dos ensaios também não pode ser melhor detalhado, pois o material foi depositado sem a expectativa dessa finalidade inicialmente. Podemos, entretanto, comprovar que a metodologia é viável e a partir do mesmo principio poderão ser desenvolvidas diversas utilidades para essa técnica inovadora
Abstract: A new era has begun all around the world. The quality of life and health depends more and more on the human capacity of resolving problems that are becoming longer and more complex day by day. As communication and globalization advance, time becomes scarcer and more precious. The semiconductor materials which are used to activate the logical functions, the high velocity memory used in processing information and the storage ¿hardware¿ are the most difficult materials produced in this area. The ability to change is enormous, due to the fact that what was considered the most modern equipment has become obsolete in the blink of an eye. Consequently, the advances in the areas of technological information are related to the advances in those in semiconductors and as result in materials. As the use of the ¿chip¿ increases, the alternatives also become varied, with the objective of improving the chip¿s functions, this is because the demand for the product is getting stronger, increasing, when referring to the population, the search for these products. This study has achieved a covering which can be perceived as a beginning to New Technology, in order to create a ¿microchip¿ with polymeric materials. It¿s the start of a new era when dealing with the area of electro-electronic materials and models. For the National Industry and for Manaus¿ Industry Pole, it might be viewed as cheaper and more accessible technology for all. An adaptation of a reactor has become full filled that produces electronic components for a deposition on a polymer substratum (ophtalmic lenses) for the attainment of a treatment of alternative anti-reflexive. This methodology is used in the industry of electronic components, more known as "chip". In this work they had been experiment design facts to optimize the excellent conditions for the covering for spin coating. Through the deposition of silicon oxide films on ophtalmic lenses one produced the silicon oxide films that had been deposited through a reactor of Microwave Electron Cyclotron Resonance, with aid of a magnetic field, a plasma constituted by a mixture of argon, oxygen and silane.This method of deposition is known as "ECR". The structure of deposited the silicon oxide films was studied through transmittance in the region of the visible light. The morphology of the surfaces re-covered with the films was analyzed by Optic Microscopy and also through Scanning Electron Microscopy Analysis (MEV). The results of transmittance for the films show that the measure where the layer is deposited form structures that improve the protection offered for the covering. The MEV micrographs had shown, also, that the surfaces best protection for silicon oxide are the gotten ones through acrylic resin, as they prove the anti-risk tests. The analysis of angle of contact of the film showed that the covering does not serve as hydrophobic layer. The measurements of parameter S which were found, were based on characteristics of the resulted prototypes and the answer limitations regarding the frequency of the equipment used for these readings. Moreover, the overall results can¿t be better detailed due to the fact that the material wasn¿t deposited with this objective. The methodology is viable, and based on the same principles it can develop diverse utilities to this innovate technique
Doutorado
Ciencia e Tecnologia de Materiais
Doutor em Engenharia Química
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Bouzgarrou, Houssam. "Performance et financement des opérations d'acquisition : firmes familiales vs. firmes non familiales." Rennes 1, 2012. http://www.theses.fr/2012REN1G008.
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Les mécanismes de gouvernance représentent une dimension de plus en plus importante dans l’étude des choix des firmes en matière d’investissement et de financement. Pour étudier la performance des acquéreurs français, nous accordons une importance particulière à la structure de propriété, et surtout à l’actionnariat familial. Nos analyses montrent que les firmes familiales surperforment les firmes non-familiales. Les tests de robustesse indiquent que ce résultat n’est pas affecté par le problème d’endogénéité. Nous concluons, en présence de ce type de contrôle, que la théorie de l’alignement des intérêts domine celle de l’accaparation des bénéfices privés. Dans ce travail, nous étudions également le choix du mode de financement en présence d’un contrôle familial. Nos résultats montrent qu’il est plus probable de recourir à la dette dans l’objectif d’éviter la perte du contrôle suite à un financement par augmentation de capital. Finalement, nous trouvons que la notion du ratio cible d’endettement est prise en compte lors du choix du mode de financement, et que l’ajustement de la structure financière post-acquisition dépend du type de contrôle de la firme[Corporate governance mechanisms represent an important dimension when studying firms’ investment and financing decisions. To investigate the performance of French acquirers, we focus on ownership structure, and especially on family ownership. Our analyses show that family firms outperform non-family firms. Robustness tests indicate that this result is not affected by the endogeneity problem. We conclude, in the presence of this type of control, that the alignment incentive effect dominates extraction of private benefits effect. In this work, we also study the choice of financing in the presence of family control. Our results show that it is more likely to use debt than equity to avoid a dilution following an equity financing. Finally, we find that the target debt ratio is taken into account when choosing the financing method, and that the capital structure adjustment, post-acquisition, depends on the control of the firm]
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Feasey, R. "Post-Flashover Design Fires." University of Canterbury. Civil Engineering, 1999. http://hdl.handle.net/10092/8266.
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This report reviews the modelling of post-flashover fires and compares the various methods of predicting temperature versus time in post-flashover compartment fires, including the historical development of theoretical approaches.
The report specifically addresses the use of the COMPF2 model as implemented in the
COMPF2PC computer programme, as a prediction tool for post-flashover fire temperatures. Aspects of the computer code are compared with theory and experimental data. The results of many COMPF2PC simulations are compared with test fire data, in order to determine how best to characterise the input data to achieve the best simulation results with the computer programme.
It is found that with careful selection of input data, COMPF2PC can provide good prediction of post flashover fire temperatures for compartments with a fire load of greater than15 kg of wood per square metre of floor area, and for ventilation factors
A˯√H/A˕ ≥ 0.04. Reliability of temperature prediction is poorer for ventilation factors
(A˯√H/A˕) significantly less than 0.04.
Guidelines for use of the COMPF2PC programme are provided.
Based on the methodology developed during simulation of test fires, generalised fire temperature versus time curves are developed for a single compartment size and a range of compartment material properties. The generalised COMPF2PC temperature versus time curves are compared with those of alternative models in common use.
It is found that for a fire of fire load 1200 MJ m-² of floor area, in a compartment of medium thermal inertia, depending on ventilation, the COMPF2PC model predicts fires which either have a significantly higher maximum temperature or longer duration (or both), than those predicted by the Eurocode Parametric fire, and the "Swedish" fire model of Magnusson and Thelandersson. This may have a significant impact on the calculation of time equivalent fires.
Recommendations for future development of the COMPF2PC programme are provided.
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Nuehlen, Christoph. "The X-files disclosed." Remscheid Gardez!-Verl, 2007. http://d-nb.info/989341046/04.
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Viegas, Alexandre da Cas. "Magnetostricção em filmes finos." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 1993. http://hdl.handle.net/10183/149640.
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Neste trabalho desenvolveu-se uma técnica de medir a magnetostricção em filmes, determinando-se a defiexão do substrato devido à tensão elástica magiletostrictiva originada no filme pela aplicação de um campo externo. Para isto desenvolveu-se um sistema de medir microdeslocamentos baseado no desbalanceamento de uma ponte capacitiva formado pelo próprio filme , numa configuração inédita até o momento. O sistema permite obter além da magnetostricção de saturação, a curva de histerese magnetostrictiva com resolução na medida do deslocamento de 5nm. O estudo da magnetostricção em filmes finos ferromagnéticos tem particular importância para o controle da anisotropia, uma vez que a tensão intrínseca do filme , vinculado ao seu caráter magnetostrictivo contribui para a anisotropia efetiva. Foi instalada também uma técnica de estimar a tensão do filme , medindo a curvatura do substrato pela reflexão de um feixe de Laser. Com a informação da tensão efetiva e a magnetostricção de saturação pode-se determinar a contribuição magnetoelástica para a anisotropia efetiva do material. Como aferição do método obteve-se curvas de magnetostricção para um filme de Níquel. Estudou-se ainda a evolução da magnetostricção associada as propriedades magnéticas e estruturais de multicamadas de Cobalto-Paládio sujeitas a tratamentos térmicos.In this work an experimental setup has been developed in order to measme magnetostriction of thin films based on the measurement of the magnetostrictive deflection of the end of a beam formed by the film and the substrate, when a magnetic field is applied. For this purpose, a system to measure very small displacements was constructed based on a capacitance bridge in which the film itself is a plate of the a capacitor. The final setup has new and original features. The measuring system allows one to extract, besides the saturation magnetostriction, the magnetostrictive histeresis curve with a resolution of 5nm in the beam's end deflection. The study of magnetostriction in very thin films has a specific importance because of the possibility of controlling the anisotropic features through the intrinsic stress whithin the material, which is related to the magnetostrictive character, and which contributes to the effective anisotropy. In this work it was also developed a technique to measure the film 's stress, measuring the curvature of the substrate and film based on the reflection o f a laser beam. Extracting both informations, the magnetostriction and the stress, one can determine the magnetoelastic contribuition to the effective anisotropy of the material. For the purpose of testing the measuring systems that were installed, the magnetostriction curve of pure nickel film was measured. The evolution of the magnetostrictive properties of Co/Pd multilayers films were also studied as a function of different annealing temperatures and of their cristalline and magnetic status.
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Buff, Xavier. "Points fixes de renormalisation." Paris 11, 1996. http://www.theses.fr/1996PA112419.
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Cette these comporte deux parties independantes. Le theme de la premiere partie est la renormalisation. La notion de renormalisation pour les systemes dynamiques est issue des experiences numeriques de feigenbaum. Dans les deux premiers chapitres, une generalisation de cette notion est faite dans le cadre des l-applications et des paires holomorphes. Dans le troisieme chapitre, une equation universelle liee a la renormalisation est etudiee, et des resultats d'epstein, eckmann et wittwer sont rappeles. Le reste de la premiere partie consiste en l'etude de trois exemples. Le premier est celui du polynome de feigenbaum. On redemontre la locale connexite au point critique (voir jiang). Le deuxieme est celui des disques de siegel et des produits de blaschke. Dans le cinquieme chapitre, on retrouve un resultat de mcmullen: certains disques de siegel sont auto-semblables au voisinage du point critique. Dans le sixieme et le septieme chapitre, on montre que ces techniques permettent de simplifier la demonstration de van strien et nowicki concernant la mesure strictement positive de l'ensemble de julia des polynomes de degre suffisamment grand. Dans la deuxieme partie de la these, on donne une condition necessaire et suffisante pour qu'un homeomorphisme entre deux compacts du plan complexe, pleins et connexes, puisse se prolonger dans un voisinage des compacts. Ce resultat utilise de maniere cruciale le prolongement de douady-earle des homeomorphismes du cercle, et peut etre appliquer a l'extension des homeomorphismes construits par branner et fagella entre certains membres de l'ensemble de mandelbrot
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Cleary, Daniel J. "Down on All Fives." Cleveland State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=csu1430069959.
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Choquet-Geniet, Annie. "Analyse et propriétés des processus communiquant par files FIFO réseaux à files à choix libre topologique et réseaux à files linéaires /." Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb376039477.
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Azevedo, Douglas Henrique Marcelino de [UNESP]. "Propriedades estruturais e eletrônicas de filmes finos de PbO2, filmes finos de TiO2 e filmes finos de TiO2 dopados com chumbo." Universidade Estadual Paulista (UNESP), 2016. http://hdl.handle.net/11449/148837.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Com a constante busca o avanço tecnológico para satisfazer as necessidades da nossa sociedade, verifica-se uma preocupação da sociedade com menor degradação do meio ambiente. Em função disso, busca-se um melhor aproveitamento dos recursos naturais, o que, por sua vez, requer tecnologia apropriada. Na indústria optoeletrônica, a utilização de materiais com propriedades ópticas e condutoras cresce continuamente, porém esta tecnologia está fortemente baseada em óxido de índio (In2O3), que é um material bastante caro, já que é naturalmente escasso. Apresente pesquisa pretende contribuir com o conhecimento, em nível microscópio, das propriedades que governam a condutividade de óxidos de chumbo e óxidos de titânio dopados visando sua utilização como óxido transparente condutor, já que titânio e chumbo são mais baratos que o índio. Estudou-se propriedades eletrônicas de filmes finos de dióxido de titânio (TiO2) e dióxido de chumbo (PbO2) em sua principal fase cristalográfica, a fase rutila, em função da superfície exposta, Empregou-se cálculos ab initio dentro da teoria do funcional de densidade (DFT) implementada no programa CRYSTAL14. Procurou-se entender os fatores responsáveis pela condutividade desses materiais e formular propostas que contribuam para a transformação desses materiais em óxidos condutores transparentes.
There is a constant search for technological development to satisfy the need of our society, on the other hand there is a growing concern with environmental conservation. However, the better use of natural sources requires appropriate technology for that.In the optoelectronic industry, the use of materials with optical and conductive properties is continuously increasing, but this technology is strongly based on indium oxide (In2O3), which is a very expensive material, since it is naturally scarce. The present research aims to contribute to the knowledge of the properties that govern the conductivity of lead and titanium oxides at the microscopic level in order to enable its use as a transparent oxide conductor. Electronic properties of thin films of titanium dioxide (TiO2) and lead dioxide (PbO2) in the main crystallographic phase (the rutile phase), depending on the exposed surface was investigated. Ab initio calculations with density functional theory (DFT) implemented in the CRYSTAL14 program have been performed. Factors responsible for the conductivity of these materials have been explored aiming to contribute to the transformation of these materials in transparent conductive oxides.
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Azevedo, Douglas Henrique Marcelino de. "Propriedades estruturais e eletrônicas de filmes finos de PbO2, filmes finos de TiO2 e filmes finos de TiO2 dopados com chumbo /." Ilha Solteira, 2016. http://hdl.handle.net/11449/148837.
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Orientador: João Manuel Marques CordeiroResumo: Com a constante busca o avanço tecnológico para satisfazer as necessidades da nossa sociedade, verifica-se uma preocupação da sociedade com menor degradação do meio ambiente. Em função disso, busca-se um melhor aproveitamento dos recursos naturais, o que, por sua vez, requer tecnologia apropriada. Na indústria optoeletrônica, a utilização de materiais com propriedades ópticas e condutoras cresce continuamente, porém esta tecnologia está fortemente baseada em óxido de índio (In2O3), que é um material bastante caro, já que é naturalmente escasso. Apresente pesquisa pretende contribuir com o conhecimento, em nível microscópio, das propriedades que governam a condutividade de óxidos de chumbo e óxidos de titânio dopados visando sua utilização como óxido transparente condutor, já que titânio e chumbo são mais baratos que o índio. Estudou-se propriedades eletrônicas de filmes finos de dióxido de titânio (TiO2) e dióxido de chumbo (PbO2) em sua principal fase cristalográfica, a fase rutila, em função da superfície exposta, Empregou-se cálculos ab initio dentro da teoria do funcional de densidade (DFT) implementada no programa CRYSTAL14. Procurou-se entender os fatores responsáveis pela condutividade desses materiais e formular propostas que contribuam para a transformação desses materiais em óxidos condutores transparentes.
Mestre
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Choquet-Geniet, Annie. "Analyse et propriétés des processus communiquant par files fifo : réseaux à files à choix libre topologique et réseaux à files linéaires." Paris 11, 1987. http://www.theses.fr/1987PA112248.
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Présentation des outils d'analyse pour les réseaux a files (réseaux à files à choix libre topologique et réseaux linéaires). Utilisation du réseau coloré associé permettant de décider la quasi-vivacité, la terminaison infinie et la vivacité. Détermination du centre des réseaux. Forme générale du langage d'entrée des files. Description du langage d'un système de deux processus communiquant par files (langage d'un réseau de Pétri)
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Gerberding, Daniela. ""Memory running out of my mouth so easily, a stream of living water" : Erinnern und Erzählen in den Romanen und autobiographischen Erzählungen von Eva Figes /." Münster : Lit, 2005. http://catalogue.bnf.fr/ark:/12148/cb41273642q.
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Rabehasaina, Landy. "Files et réseaux de files d'attente fluides du second ordre en environnement aléatoire." Rennes 1, 2003. http://www.theses.fr/2003REN10044.
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Nous nous intéressons dans cette thèse à une file d'attente fluide unique ou à un réseau de files d'attente fluides pilotés par un processus stationnaire. Les niveaux des files à chaque instant sont alors modélisés comme solution d'une équation différentielle réfléchie. Le modèle peut être du second ordre, i. E. Une composante brownienne et un coefficient de diffusion peuvent intervenir dans la modélisation: l'équation différentielle devient alors une équation différentielle stochastique. Nous étudions d'abord la stabilité des files. Nous donnons différents critères permettant à la file unique ou au réseau de files de converger en distribution vers un état stationnaire. Nous regardons ensuite la distribution de la loi stationnaire. Dans différents cas nous donnons la transformée de Laplace de la loi stationnaire ou au moins ses moments d'ordre deux.
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Tsatsoulas, Dimitrios. "Industrial fires in northern greece. The influence of flame retardant coating on timber fires." Thesis, University of Leeds, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.489861.
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This Thesis deals with the problem of fire protection mainly in industrial units in the region of Northern Greece. The region represents a large enough sample to allow applications of the findings to the rest of Greece. The approach adopted was two Parts: Part 1: Collection and analysis of ali significant industrial fires in Northern Greece between 1999-2003. Fire incident data were gathered from the Greek Fire Service, National Statistical service, Greek Insurance Union. In total seven hundred and three (703) fire incidents were analyzed. Analysis involved categorizing according industry type. Further analysis for the biggest categories of Timber and Textile industries with respect to place of origin, ignition sources, first ignited materials, time of ignition, degree of spread, financial loss. The data were further processed to provide the probability of fire breaking, fire spread and the expected financial loss was determined using Extreme Value Theory. The main finding ofthe statistical analysis were: • Although the Textile and Timber industries account for lees than 6% of the industrial units they account for 47% ofall fire incidents • The largest values of probability of fires breaking -out were' mostly seen in the ' production and machinery areas, due to electricity, followed by fires breaking in storage areas due to electrical causes or arson. • Event tree analysis showed that the' probability of the fire spreading beyond the item first ignited was large(about 70%) for Textile and Timber industries in comparison. to other countries. The statistical analysis showed clearly that prevention of fire spread beyond the first item ignited would have a major impact on the reduction of fire losses. 24% of first-ignited materials were wooden surfaces. In the category of timber industries alone, this figure was 55%. -. ~ ,'.. ~ ....- -.' .•. Part2 : As a possible solution to the problem the effect of three (3) typical intumescent flame retardants (latest technology) on the most common types of Timber in Greek industries was examined in small (cone calorimeter) and medium scale (1m3 enclosed fire rig) experiments combined with online effluent gas analysis equipment (FTIR). Analysis involved thermal behavior, smoke production and toxic species analysis of the samples. The main findings ofthe experimental analysis were: • No ignition' and lower toxic emissions compared to untreated samples were . observed at 35kW/m2 (small scale). • The same behavior was observed in those cases where wooden surfaces located next to ignition source had been treated (medium scale). As a next step the experimental and statistical data was employed in an event-tree analysis for cases of fires in Timber industries Based in this analysis it was estimated that the probability of a fire spreading beyond the first ignited materials in case of treatment with - . . -- - ._- flame retardants reduced by 58% A tentative cost benefit analysis using a typical industrial unit supported the use of flame retardants on a financial basis with a payback period of two (2) years. It is proposed that the application of intumescent flame retardants on wooden surfaces located close to ignition sources in the most probable areas for a fire to break out, could be a safe and effective approach in reducing fire losses in industries.
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Parsons, Russell Andrew. "Spatial variability in forest fuels simulation miodeling and effects on fire behavior /." CONNECT TO THIS TITLE ONLINE, 2007. http://etd.lib.umt.edu/theses/available/etd-05272008-141125/.
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Davis, Samuel. "Automatic juxtaposition of source files." Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/1607.
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Previous research has found that programmers spend a significant fraction of their time navigating between different source code locations and that much of that time is spent returning to previously viewed code. Other work has identified the ability to juxtapose arbitrary pieces of code as cognitively important. However, modern IDEs have inherited a user interface design in which, usually, only one source file is displayed at a time, with the result that users must switch back and forth from one file to another.
Taking advantage of the increasing availability of large displays, we propose a new interaction paradigm in which an IDE presents parts of multiple source files side by side, using the Mylyn degree-of-interest function to dynamically allocate screen space to them on the basis of degree-of-interest to the current development task. We demonstrate the feasibility of this paradigm with a prototype implementation built on the Eclipse IDE and note that it was used by the author over a period of months in the development of the prototype itself. Additionally, we present two case studies which quantify the potential reduction in navigation and demonstrate the simplicity of the approach and its ability to capture complete concerns on screen. These case studies suggest that the approach has the potential to reduce the time that programmers spend navigating by as much as 50%.
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González, Férez Juan de la Cruz. "La Categoría de Módulos Firmes." Doctoral thesis, Universidad de Murcia, 2008. http://hdl.handle.net/10803/10962.
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Sea R un anillo asociativo no unitario. Un módulo M se dice firme si es isomorfo de forma canónica al producto tensorial sobre R de R por M. La categoría formada por los módulos firmes es una generalización natural de la categoría de módulos unitarios para anillos unitarios.Una propiedad fundamental y que permanecía como problema abierto era la abelianidad de la categoría de módulos firmes. En la memoria se prueba que en general la categoría no es abeliana, mostrando un ejemplo de anillo asociativo R y de un monomorfismo que no es núcleo de ningún otro morfismo de la categoría. Se realiza un estudio profundo de la categoría de módulos firmes y de multitud de propiedades equivalentes a la abelianidad, así como otras propiedades más débiles y que tampoco se cumplen en general.Let R a nonunital ring. A module M is set to be firm if it is isomorphic in the canonical way to the tensor product about R of R by M. The category of firm modules generalizes the usual category of unital modules for a unital ring.It was a open problem if the category of firm modules is an abelian category. We prove that, in general, this category is not abelian, and we find a ring and a monomorphism that is not a kernel in this category. The category of firm modules has been estudied in detail. We have deeply analyzed several properties equivalent to be abelian, and some others with weaker restrictions that are not satisfied in general
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Naro, Daniel. "Security strategies in genomic files." Doctoral thesis, Universitat Politècnica de Catalunya, 2020. http://hdl.handle.net/10803/669108.
Full textAbstract:
There are new mechanisms to sequence and process the genomic code, discovering thus diagnostic tools and treatments. The file for a sequenced genome can reach hundreds of gigabytes. Thus, for further studies, we need new means to compress the information and a standardized representation to simplify the development of new tools.
The ISO standardization group MPEG has used its expertise in compressing multimedia content to compress genomic information and develop its ´MPEG-G standard’. Given the sensitivity of the data, security is a major identified requirement. This thesis proposes novel technologies that assure the security of both the sequenced data and its metadata.
We define a container-based file format to group data, metadata, and security information at the syntactical level. It includes new features like grouping multiple results in a same file to simplify the transport of whole studies. We use the granularity of the encoder’s output to enhance security. The information is represented in units, each dedicated to a specific region of the genome, which allows to provide encryption and signature features on a region base. We analyze the trade-off between security and an even more fine-grained approach and prove that apparently secure settings can be insecure: if the file creator may encrypt only specific elements of a unit, cross-checking unencrypted information permits to infer encrypted content.
Most of the proposals for MPEG-G coming from other research groups and companies focused on data compression and representation. However, the need was recognized to find a solution for metadata encoding. Our proposal was included in the standard: an XML-based solution, separated in a core specification and extensions. It permits to adapt the metadata schema to the different genomic repositories' frameworks, without importing requirements from one framework to another. To simplify the handling of the resulting metadata, we define profiles, i.e. lists of extensions that must be present in a given framework. We use XML signature and XML encryption for metadata security.
The MPEG requirements also concern access rules. Our privacy solutions limit the range of persons with access and we propose access rules represented with XACML to convey under which circumstances a user is granted access to a specific action among the ones specified in MPEG-G's API, e.g. filtering data by attributes. We also specify algorithms to combine multiple rules by defining default behaviors and exceptions.
The standard’s security mechanisms protect the information only during transport and access. Once the data is obtained, the user could publish it. In order to identify leakers, we propose an algorithm that generates unique, virtually undetectable variations. Our solution is novel as the marking can be undone (and the utility of the data preserved) if the corresponding secret key is revealed. We also show how to combine multiple secret keys to avoid collusion.
The API retained for MPEG-G considers search criteria not present in the indexing tables, which highlights shortcomings. Based on the proposed MPEG-G API we have developed a solution. It is based on a collaboration framework where the different users' needs and the patient's privacy settings result in a purpose-built file format that optimizes query times and provides privacy and authenticity on the patient-defined genomic regions. The encrypted output units are created and indexed to optimize query times and avoid rarely used indexing fields. Our approach resolves the shortcomings of MPEG-G's indexing strategy.
We have submitted our technologies to the MPEG standardization committee. Many have been included in the final standard, via merging with other proposals (e.g. file format), discussion (e.g. security mechanisms), or direct acceptance (e.g. privacy rules).Hi han nous mètodes per la seqüenciació i el processament del codi genòmic, permetent descobrir eines de diagnòstic i tractaments en l’àmbit mèdic. El resultat de la seqüenciació d’un genoma es representa en un fitxer, que pot ocupar centenars de gigabytes. Degut a això, hi ha una necessitat d’una representació estandarditzada on la informació és comprimida. Dins de la ISO, el grup MPEG ha fet servir la seva experiència en compressió de dades multimèdia per comprimir dades genòmiques i desenvolupar l'estàndard MPEG-G, sent la seguretat un dels requeriments principals. L'objectiu de la tesi és garantir aquesta seguretat (encriptant, firmant i definint regles d¿ accés) tan per les dades seqüenciades com per les seves metadades. El primer pas és definir com transportar les dades, metadades i paràmetres de seguretat. Especifiquem un format de fitxer basat en contenidors per tal d'agrupar aquets elements a nivell sintàctic. La nostra solució proposa noves funcionalitats com agrupar múltiples resultats en un mateix fitxer. Pel que fa la seguretat de dades, la nostra proposta utilitza les propietats de la sortida del codificador. Aquesta sortida és estructurada en unitats, cadascuna dedicada a una regió concreta del genoma, permetent una encriptació i firma de dades específica a la unitat. Analitzem el compromís entre seguretat i un enfocament de gra més fi demostrant que configuracions aparentment vàlides poden no ser-ho: si es permet encriptar sols certes sub-unitats d'informació, creuant els continguts no encriptats, podem inferir el contingut encriptat. Quant a metadades, proposem una solució basada en XML separada en una especificació bàsica i en extensions. Podem adaptar l'esquema de metadades als diferents marcs de repositoris genòmics, sense imposar requeriments d’un marc a un altre. Per simplificar l'ús, plantegem la definició de perfils, és a dir, una llista de les extensions que han de ser present per un marc concret. Fem servir firmes XML i encriptació XML per implementar la seguretat de les metadades. Les nostres solucions per la privacitat limiten qui té accés a les dades, però no en limita l’ús. Proposem regles d’accés representades amb XACML per indicar en quines circumstàncies un usuari té dret d'executar una de les accions especificades a l'API de MPEG-G (per exemple, filtrar les dades per atributs). Presentem algoritmes per combinar regles, per tal de poder definir casos per defecte i excepcions. Els mecanismes de seguretat de MPEG-G protegeixen la informació durant el transport i l'accés. Una vegada l’usuari ha accedit a les dades, les podria publicar. Per tal d'identificar qui és l'origen del filtratge de dades, proposem un algoritme que genera modificacions úniques i virtualment no detectables. La nostra solució és pionera, ja que els canvis es poden desfer si el secret corresponent és publicat. Per tant, la utilitat de les dades és mantinguda. Demostrem que combinant varis secrets, podem evitar col·lusions. L'API seleccionada per MPEG-G, considera criteris de cerca que no són presents en les taules d’indexació. Basant-nos en aquesta API, hem desenvolupat una solució. És basada en un marc de col·laboració, on la combinació de les necessitats dels diferents usuaris i els requeriments de privacitat del pacient, es combinen en una representació ad-hoc que optimitza temps d’accessos tot i garantint la privacitat i autenticitat de les dades. La majoria de les nostres propostes s’han inclòs a la versió final de l'estàndard, fusionant-les amb altres proposes (com amb el format del fitxer), demostrant la seva superioritat (com amb els mecanismes de seguretat), i fins i tot sent acceptades directament (com amb les regles de privacitat).
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Cleary, Matthew John. "CMC Modelling of Enclosure Fires." University of Sydney. Aerospace, Mechanical and Mechatronic Engineering, 2005. http://hdl.handle.net/2123/696.
Full textAbstract:
This thesis describes the implementation of the conditional moment closure (CMC) combustion model in a numerical scheme and its application to the modelling of enclosure fires. Prediction of carbon monoxide (CO) in the upper smoke layer of enclosure fires is of primary interest because it is a common cause of death. The CO concentration cannot be easily predicted by empirical means, so a method is needed which models the chemistry of a quenched, turbulent fire plume and subsequent mixing within an enclosed space. CMC is a turbulent combustion model which has been researched for over a decade. It has provided predictions of major and minor species in jet diffusion flames. The extension to enclosure fires is a new application for which the flow is complex and temperatures are well below adiabatic conditions. Advances are made in the numerical implementation of CMC. The governing combustion equations are cast in a conserved, finite volume formulation for which boundary conditions are uniquely defined. Computational efficiency is improved through two criteria which allow the reduction in the size of the computational domain without any loss of accuracy. Modelling results are compared to experimental data for natural gas fires burning under a hood. Comparison is made in the recirculating, post-flame region of the flow where temperatures are low and reactions are quenched. Due to the spatial flux terms contained in the governing equations, CMC is able to model the situation where chemical species are produced in the high temperature fire-plume and then transported to non-reacting regions. Predictions of CO and other species are in reasonable agreement with the experimental data over a range of lean and rich hood-fire conditions. Sensitivity of results to chemistry, temperature and modelling closures is inves- tigated. Species predictions are shown to be quite different for the two detailed chemical mechanisms used. Temperature conditions within the hood effect the for- mation of species in the plume prior to quenching and subsequently species predic- tions in the post-flame region are also effected. Clipped Gaussian and ß-function probability density functions (PDFs) are used for the stochastic mixture fraction. Species predictions in the plume are sensitive to the form of the PDF but in the post-flame region, where the ß-function approaches a Gaussian form, predictions are relatively insensitive. Two models are used for the conditional scalar dissipation: a uniform model, where the conditional quantity is set equal to the unconditional scalar dissipation across all mixture fraction space; and a model which is consistent with the PDF transport equation. In the plume, predictions of minor species are sensitive to the modelling used, but in the recirculating, post-flame region species are not significantly effected.
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Corless, Jason David. "Compression of Java class files." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape16/PQDD_0004/MQ32660.pdf.
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Ducré-Robitaille, Jean-François. "Files d'attente avec clients négatifs." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ48922.pdf.
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Shannon, Mike. "Flora Files: The UA Herbarium." College of Agriculture, University of Arizona (Tucson, AZ), 1986. http://hdl.handle.net/10150/295521.
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Stern-Gottfried, Jamie. "Travelling fires for structural design." Thesis, University of Edinburgh, 2011. http://hdl.handle.net/1842/5244.
Full textAbstract:
Traditional methods for specifying thermal inputs for the structural fire analysis of buildings assume uniform burning and homogeneous temperature conditions throughout a compartment, regardless of its size. This is in contrast to the observation that accidental fires in large, open-plan compartments tend to travel across floor plates, burning over a limited area at any one time. This thesis reviews the assumptions inherent in the traditional methods and addresses their limitations by proposing a methodology that considers travelling fires for structural design. Central to this work is the need for strong collaboration between fire safety engineers to define the fire environment and structural fire engineers to assess the subsequent structural behaviour. The traditional hypothesis of homogeneous temperature conditions in postflashover fires is reviewed by analysis of existing experimental data from wellinstrumented fire tests. It is found that this assumption does not hold well and that a rational statistical approach to fire behaviour could be used instead. The methodology developed in this thesis utilises travelling fires to produce more realistic fire scenarios in large, open-plan compartments than the conventional methods that assume uniform burning and homogeneous gas phase temperatures which are only applicable to small compartments. The methodology considers a family of travelling fires that includes the full range of physically possible fire sizes iv within a given compartment. The thermal environment is split into two regions: the near field (flames) and the far field (smoke away from the flames). Smaller fires travel across a floor plate for long periods of time with relatively cool far field temperatures, while larger fires have hotter far field temperatures but burn for shorter durations. The methodology is applied to case studies showing the impact of travelling fires on generic concrete and steel structures. It is found that travelling fires have a considerable impact on the performance of these structures and that conventional design approaches cannot automatically be assumed to be conservative. The results indicate that medium sized fires between 10% and 25% of the floor area are the most onerous for a structure. Detailed sensitivity analyses are presented, showing that the structural design and fuel load have a larger impact on structural behaviour than any numerical or physical parameter required for the methodology. This thesis represents a foundation for using travelling fires for structural analysis and design. The impact of travelling fires is critical for understanding true structural response to fire in modern, open-plan buildings. It is recommended that travelling fires be considered more widely for structural design and the structural mechanics associated with them be studied in more detail. The methodology presented in this thesis provides a key framework for collaboration between fire safety engineers and structural fire engineers to achieve these aims.
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Moqbel, Shadi. "CHARACTERIZING SPONTANEOUS FIRES IN LANDFILLS." Doctoral diss., University of Central Florida, 2009. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2695.
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Landfill fires are relatively common incidents that landfill operators encounter which have great impact on landfill structure and the environment. According to a U.S. Fire Administration report in 2001, an average of 8,300 landfill fires occurs each year in the United States, most of them in the spring and summer months. Subsurface spontaneous fires are considered the most dangerous and difficult to detect and extinguish among landfill fires. Few studies have been conducted on spontaneous fires in landfills. Information regarding the thermal behavior of solid waste is not available nor have measurements been made to evaluate spontaneous ignition of solid waste. The purpose of this research was to provide information concerning the initiation of spontaneous ignition incidents in landfills, and investigate the conditions favoring their occurrence. This study enabled better understanding of the self-heating process and spontaneous combustion in landfills. Effects of parameters critical to landfill operation on spontaneous combustion were determined. Spontaneous combustion occurs when materials are heated beyond the ignition temperature. Temperature rise occurs inside the landfill due to exothermic reactions which cause self-heating of the solid waste. Oxygen introduction leading to biological waste degradation and chemical oxidation is believed to be the main cause of rising solid waste temperatures to the point of ignition. A survey was distributed to landfill operators collecting information regarding spontaneous firs incidents in their landfills. Survey results raised new questions necessitating further study of subsurface fires incidents. Subsurface spontaneous fires were not restricted to any landfill geometry or type of waste (municipal, industrial, commercial, and construction and demolition). Results showed that landfill fires occur in landfills that do and do not recirculate leachate. Although new methods have been developed to detect subsurface fires, landfill operators depend primarily on visual observation of smoke or steam to detect the subsurface fires. Also, survey results indicated that excavating and covering with soil are the most widespread methods for extinguishing subsurface fires. Methane often has been suspected for initiating spontaneous subsurface firs in the landfill. However, combustible mixture of methane and oxygen requires very high temperature to ignite. In this study it was shown that spontaneous fires are initiated by solid materials with lower ignition points. Laboratory tests were conducted evaluating the effect of moisture content, oxygen concentration and leachate on spontaneous ignition of solid waste. A new procedure for testing spontaneous ignition is described based on the crossing-point method. The procedure was used to study the spontaneous combustion of solid waste and determine the auto-ignition temperature of the solid waste components and a synthesized solid waste. Correlations have been established between auto-ignition temperature, specific weight and energy content and between self-heating temperature and specific weight. Correlations indicated that compaction can help avoid spontaneous combustion in the landfill. Dense materials require higher energy to increase in temperature and limit the accessibility of oxygen. In the experimental work, moisture was found to promote both biological and chemical self-heating. Increasing moisture content lowers the solid waste permeability and absorbs more energy as it evaporates. Dissolved solids in leachate were found to promote self-heating and ignition more than distilled water. Varying oxygen concentrations indicated that heat generation occurs due to chemical oxidation even at oxygen concentration as low as 10% by volume. However, at 10% by volume oxygen, solid waste did not exhibit thermal runaway nor flammable combustion. At 0% by volume oxygen, tests results indicated occurrence of self-heating due to slow pyrolysis. A numerical one-dimensional energy model was created to simulate temperature rise in landfill for four different scenarios. Using the results from the laboratory experiment, the model estimated the heat generation in solid waste due to chemical reactions. Results from the scenario simulations indicated that moisture evaporation is the major heat sink in the landfill. The model showed that gas flow has a cooling effect due to increasing amount of evaporated water and can control the temperature inside the landfill. The model showed that a temperature higher than the biological limit can be maintained in the landfill without initiating spontaneous fire.Ph.D.
Department of Civil and Environmental Engineering
Engineering and Computer Science
Environmental Engineering PhD
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Boomgaarden, Jacob, and Joshua Corney. "Mobile Konami Code Source Files." Monterey, California. Naval Postgraduate School, 2015. http://hdl.handle.net/10945/44727.
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An archive file of Android source code projects available for import into Android Studio. These projects were utilized in the research for the following thesis: MOBILE KONAMI CODES: ANALYSIS OF ANDROID MALWARE SERVICES UTILIZING SENSOR AND RESOURCE-BASED STATE CHANGES.
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Padfield, P. J. "Files of pancreatic enzyme release." Thesis, University of Manchester, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376284.
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Kleinke, Maurício Urban 1958. "Turbulência interfacial em filmes coloidais." [s.n.], 1989. http://repositorio.unicamp.br/jspui/handle/REPOSIP/278473.
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Orientador: Omar TeschkeTese (doutorado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataghin
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Resumo: Neste trabalho foi investigada a correlação entre as dimensões dos padrões regulares formados durante a anodização de alumínio em ácidos sulfúrico, oxálico, crômico fosfórico e a variação da molhabilidade medida entre dois estados distintos de polarização do alumínio, os estados de evolução de H2 e de crescimento de óxido na mesma solução ácida. Para esta medida foi desenvolvido um equipamento do tipo Wilhelmy, utilizado para medidas de tensão superficial. A correlação acima citada sugeriu que os padrões fossem formados por gradientes de tensão interfacial induzidos por flutuações da concentração de Al2O3. Um modelo hidrodinâmico utilizando a equação de Navier-Stokes foi utilizado para descrever as forças que atuam na camada coloidal formada durante a oxidação. Esta hipótese foi confirmada através de unta correlação obtida entre as dimensões das células formadas nos padrões regulares e a variação da tensão superficial, propondo que a força motriz que movimenta o colóide e o liquido seja a variação da tensão superficial, para distintas concentrações de ácido sulfúrico. Os resultados indicam que a tensão interfacial pode gerar turbulência, o que provocaria a formação dos padrões regulares observados
Abstract: In this work we investigate the correlation between the almost regular pattern size obtained in aluminum anodization for various acid solutions like sulfuric, oxalic, chromic, and phosphoric acids and its wettability variations determined by using a Wilhelmy-type apparatus, obtained for two aluminum electrode polarization¿s, i.e. anodic deposition and H2 evolution immersed in the same acid solutions. The correlation between these two factors suggested that these patterns are generated by interface tension gradients induced by Al2O3 concentration fluctuations. A theoretical model that describes the forces acting on a colloidal Al2O3 layer formed on the electrode surface was developed by using the Navier-Stokes equation. The hypotheses was checked by establishing a correlation between the measured size of periodic cells formed and the measured surface tension variation and assuming that this surface tension variation is the driving force of the liquid layer movement for various sulfuric acid concentrations. A good matching between the model and the measured values was obtained indicating that surface tension gradients may indeed generate turbulence that leads to the formation of the observed regular patterns
Doutorado
Física
Doutor em Ciências
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Ferreira, Fabio Furlan. "Eletrocromismo em filmes finos compósitos." Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-05072012-162751/.
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Neste trabalho calculamos inicialmente as propriedades ópticas de filmes compósitos de Me-NiO e Me-CoO, sendo os metais Me = Au, Ag, Cu, Ni, Pd e Pt, a partir da teoria de meio efetivo de Maxwell Garnett. Este estudo teórico possibilitou avaliar a viabilidade de se obter experimentalmente um material colorido na região do espectro visível, com absorção seletiva numa estreita faixa de comprimentos de onda. Os resultados mostraram que o candidato ideal para tal fim é o compósito a base de Au. A partir deste resultado iniciou-se o crescimento de filmes finos compósitos de Au-NiO e Au-CoO, utilizando diferentes estratégias experimentais: (i) deposição por DC magnetron sputtering reativo, (ii) deposição do filme de NiO, por DC magnetron sputtering reativo e Au pelos métodos de sol-gel e dip coating e (iii) deposição de ambos os filmes, NiOxHy e Au, por sol-gel e dip coating. Os resultados mostraram uma seletividade pequena (-5-10%) nos filmes crescidos pelo método de sputtering, devido ao caráter atomístico desse tipo de técnica, que conduz à formação de pequenos aglomerados de Au (menores que -3 nm), ao invés de agregados com tamanhos da ordem de algumas dezenas de nanômetros, obtidos facilmente pelo método sol-gel. O crescimento na forma de multicamadas proporciona uma melhor seletividade, em torno de 1 5%. Pós-tratamentos térmicos em filmes compósito s obtidos unicamente por sputtering induzem a aglomeração do Au, mas destroem as propriedades eletrocrôrnicas. No caso de filmes de Au crescidos por sol-gel, a seletividade espectral, decorrente da presença do Au aumenta, indo de 15% a 20% em filmes depositados sobre a matriz óxida crescida por sputtering e por sol-gel, respectivamente. Mediante processos eletroquímicos, os filmes de NiOxHy crescidos por sol-gel e dip coating apresentaram os melhores resultados de variação de transmitância (70%), devido à maior porosidade desses filmes.In this work we initially calculated the optical properties of cermet films of Me-NiO and Me-CoO, being the metals Me = Au, Ag, Cu, Ni, Pd and Pt, by means of the Maxwell Garnett effective medium theory. This theoretical study allowed evaluating the viability to obtain, experimentally, a colored material in the visible spectrum region, with selective absorption in a narrow range of wavelengths. The results showed that the ideal candidate for such goal is the Au cermet. Looking at this result, the growth of Au-NiO and Au-CoO thin films was initiated using different experimental strategies: (i) deposition by reactive DC magnetron sputtering, (ii) deposition of the NiO, film by reactive DC magnetron sputtering and Au by the sol-gel and dip coating methods and (iii) deposition of both films, NiOxHy and Au, by sol-gel and dip coating. The films grown by sputtering showed a small selectivity (-5-10%), due to the atomistic character of this type of technique. It leads to the formation of small clusters of Au (smaller than -3 nrn), instead of aggregates with sizes of the order of some tenths of nanometers, easily obtained by the sol-gel method. Better selectivity, around 15%, is obtained in films deposited as multilayers. Post thermal annealing of the cermet films grown by sputtering induces the agglomeration of Au, but destroys the electrochromic properties. In the case of Au films grown by sol-gel, the spectral selectivity increases, due to the presence of Au, going from 15% to 20% in films deposited on the oxide matrix, deposited by sputtering and sol-gel, respectively. Under electrochemical processes, the NiOxHy films grown by sol-gel and dip coating presented the highest transmission variation (70%), due to larger porosity of these films.
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Rodrigues, Tiago dos Santos. "Efeitos fototérmicos em filmes ultrafinos." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/46/46132/tde-07032007-094212/.
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Nesta dissertação são estudados três sistemas interfaciais, com o objetivo de observar o efeito do aquecimento localizado por laser. O primeiro sistema consistiu de filmes ultrafinos de níquel ftalocianina tetrasulfonada, com intercalantes diferentes (Zr e PDDA), analisados pela técnica fototérmica de lente térmica (LT). Foi montada uma instrumentação de LT completa, sendo a fonte excitante um laser de He-Ne de baixa potência (10 mW). Estes filmes, com diferentes números de camadas, foram imersos em solventes orgânicos e a transferência de calor na interface foi estudada através do ajuste do sinal de LT. Os dados obtidos revelaram a proporcionalidade do sinal de LT com o aumento do número de camadas e permitiram a determinação das difusividades térmicas dos solventes utilizados. O segundo sistema consistiu de monocamadas de hexadecanol depositadas na superfície de soluções de cristal violeta (CV). A superfície destas soluções foi aquecida a laser e a transferência do calor gerado foi detectada através de uma instrumentação de deflexão fototérmica transversa (PDB). Estes experimentos foram realizados em uma balança de superfície, com uma compressão controlada da mono camada. Foi observado um aumento da transferência de calor para o ar a partir de um certo ponto da isoterma de compressão da monocamada. O mecanismo de supressão de correntes de convecção por surfatantes é indicado como provável causador deste aumento de transferência de calor. O terceiro sistema consistiu na fabricação de filmes LB de ácido octadecanóico modificados pelo aquecimento do menisco durante a sua deposição. Uma instrumentação semelhante a empregada no segundo experimento serviu de base para estes experimentos, com o laser de excitação direcionado próximo ao substrato. Foram observadas as curvas de taxa de transferência e foram comparadas as morfologias do filme resultante deste aquecimento com filmes não aquecidos do ácido octadecanóico e do ácido octadecanóico na presença de Orange G (OG), o corante empregado para geração de calor. Nestes estudos morfológicos são apresentadas microscopia ópticas do filme, que mostram a formação de anéis no filme, provavelmente devido à evaporação da subfase. São também apresentadas imagens de microscopia de força atômica deste filme submetido a aquecimento, evidenciando o enrugamento da superfície em nível micrométrico, mostrando ser possível modificar o processo de formação de filmes através do aquecimento localizado.In this dissertation three interfacial systems were examined, with the goal of observing the effect of localized laser-heating on them. The first studied system were ultrathin films of nickel tetrasulfophthalocyanine, with different compounds (Zr or PDDA), analyzed by thermal lens. A complete instrumentation of LT was mounted, being the exciting source a He-Ne laser of low power (10 mW) and low cost. These films, with different numbers of layers, had been immersed in organic solvents and the heat transfer through the interface was studied through mathematical fitting of the LT signal. The acquired data had disclosed the proportionality of the signal of LT with the increase in the number of layers and had allowed the determination of thermal diffusivities of the used solvents. Hexadecanol monolayers on the surface of Crystal Violet (CV) aqueous solutions were the second system to be studied. The surface of these solutions was laser-heated and the heat transfer to the air was detected through a photothermal beam deflection instrumentation (PDB). These experiments have been carried out in a surface balance to provide controlled compression of the monolayer. An increase in the heat transfer to the air from a certain point of the monolayer isotherm was observed. The mechanism of suppression of surface tension-induced convection by surfactants is proposed as the probable cause of such increase. LB films of octadecanoic acid were used in the third set of experiments, with the aim of modifying the film surface morphology by laser heating of the meniscus region during the deposition process. An instrumentation similar to the one employed in the previous experiment served as base for these experiments, with the laser of excitement pointed close to the substrate. The curves of transfer ratio had been observed and the morphologies of the laser-heated ?lm were compared to the non-heated films of octadecanoic acid with and without Orange G (OG, dye used as auxiliary for heat generation). Optical microscopy images from the laser-heated film were obtained, showing ring formation, probably due the evaporation of subphase. Also images of atomic force microscopy of this laser-heated film are shown, evidencing the wrinkling of the surface in micrometric level when compared to similar films from non-heated films. This behaviour shows the feasibility of modification in the process of formation of LB films through localised laser-heating.
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COELHO, ALVARO L. "Filmes supercondutores do sistema YBsubaCsubuO." reponame:Repositório Institucional do IPEN, 1991. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10257.
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Dissertacao (Mestrado)
IPEN/D
Instituto de Fisica, Universidade de Sao Paulo - IF/USP
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Alegría, Varona Ciro. "El Estado y sus fines." IUS ET VERITAS, 2016. http://repositorio.pucp.edu.pe/index/handle/123456789/122738.
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Davi, Christiane Pinto. "Filmes multicamadas de látex natural." reponame:Repositório Institucional da UFABC, 2014.
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Enasri, Abdelaziz. "Les firmes en participation internationale." Aix-Marseille 2, 1995. http://www.theses.fr/1995AIX24001.
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Le but de cette thèse est d'étudier certains aspects stratégiques qui découlent de la formation de joint-ventures internationales. Le gouvernement local du pays qui accueille la joint-venture participe à la prise de décisions, soit en aidant les firmes locales, soit en imposant des taxes ou des tarifs sur les firmes étrangères qui participent à la joint-venture; le but de ce gouvernement est d'accroître le bien-être social. Les problèmes liés à la dissuasion de l'entrée, le transfert de technologie, la confidentialité des technologies des firmes multinationales, ainsi que l'instabilité de ce genre de coopération nous a amené à investir dans une approche qui permet d'expliquer mieux ce genre de coopération. Voir les trois derniers chapitres de cette thèse. Dans les trois premiers chapitres de la thèse nous avons exposé certains résultatsThe aim of this thesis is to study some strategical aspects in order to form an international joint-venture. In order to maximise the welfare of this country, the local government how receives the joint-venture participates in decision -making by subsiding national firm or and imposing a tax and tariff to foreign firm. The most problem engendered by entry deterrence, technology transfer, asymmetric information concerning the technology owned by multinational firms, and the instability merit a special investigation concerning this form of cooperation. We have exposed in last three chapters of this thesis our work concerning international joint-venture. In the three first chapters of this thesis, we have exposed the existing literature concerning joint-venture
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Boussaf, Kamal. "Propriétés fines des éléments analytiques." Clermont-Ferrand 2, 1995. http://www.theses.fr/1995CLF21712.
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L'objet de cette thèse est d'étudier les propriétés des élements analytiques au sens de Krasner sur des ensembles aussi généraux que possible. En particulier, les notions d’éléments quasi-minore et quasi-inversible définies par A. Escassut pour des fermes bornes sont généralisées à des ensembles quelconques. Nous comparons alors ces deux classes et nous montrons qu'elles possèdent des propriétés topologiques très intéressantes. Dans le cas d'une algèbre d’éléments analytiques, parmi les semi-normes multiplicatives continues nous déterminons celles qui sont des valeurs absolues: Elles sont caractérisées par l'emplacement de leurs filtres circulaires associés par rapport aux t-filtres. Entre autres, nous donnons en toute généralité une condition nécessaire et suffisante d'existence de valeurs absolues continues. L’étude de la factorisation d'un élément analytique en facteurs singuliers a montré que certains énoncés de résultats de Motzkin ne sont pas vrais, nous proposons alors une nouvelle présentation de cette décomposition à l'aide des séries de Mittag-leffler. Nous concluons cette thèse par une application des résultats précédents d'une part à la caractérisation des homomorphismes entre algèbres d’éléments analytiques et d'autre part a l’étude des prolongements des solutions des équations différentielles logarithmiques