To see the other types of publications on this topic, follow the link: Novatek.
Dissertations / Theses on the topic 'Novatek'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 dissertations / theses for your research on the topic 'Novatek.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
1
Gelder, David Camenish. "Buckling and Crippling of Square Steel Thin-Walled Tubes Fabricated with Symmetrically-Overlapping U-Channels and Foam." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3346.
Full textAbstract:
Testing and analysis has been performed on square steel thin-walled tubes fabricated using symmetrically-overlapping U-channels and foam. This research analyzes flange-to-flange attachment, effect of foam in the columns, effect of adhesive stiffness, and influence of steel thickness, as related to the local buckling loads, global buckling loads, and crippling loads. Four 14-foot (4.27 m) foam-filled, thin-walled, galvanized steel columns were manufactured by Novatek, Inc. and tested in axial compression with pinned boundary conditions. For three of the four configurations, the two-piece 4-in. (10.2-cm) square shell surrounded prefabricated polystyrene foam inserts; the fourth column had no foam insert. The column outer shells were composed of two 16-gauge galvanized steel channels with overlapping flanges and the webs on opposite sides of the column. The two adjacent flanges on each side of the columns were adhesively bonded together in all cases. In addition to the adhesive, two columns had either periodic screws or short welds spaced evenly along the length of the columns to delay the onset of flange buckling of the outer channel, and potentially increase the compression strength. The other two columns had adhesive only bonding the flanges, one of which had no foam filler. The various configurations all exhibited similar compression strengths. Failure for all columns initiated with local buckling, followed by global buckling and local crippling, which occurred simultaneously. The method of flange attachment, the effect of the foam in the columns, and flange thicknesses were isolated and analyzed using mechanics-based analysis, parametric studies, and finite element analysis. The results show the ideal spacing of screws or short-welds, if used, is less than or equal to 5 in (12.7 cm) for the given column length. This increases the local buckling load to the Euler buckling load and preserves the original shape of the cross-section. The adhesive needs only a tensile strength of approximately 1 ksi (6.4 kPa) to prevent local buckling for any spacing of screws or short-welds, but needs to be applied uniformly (much of the adhesive in the column tests had been scraped off of the flanges during assembly). The results also show that foam core does not increase the Euler buckling load, but does increase the crippling load by delaying inward buckling of the column webs and flanges. Using foam with the given stiffness and a yield strength of 50 psi (345 kPa), uniform foam-to-steel bonding could increase the crippling strength up to 21% even without adhesive between the flanges. Using adhesive with the given stiffness between the flanges could increase the crippling strength by up to 63% without foam. The crippling strength could increase up to 72% if both adhesive between the flanges and a foam insert are used.
2
Verot, Alain. "Jacques Lisfranc : Chirurgien novateur." Saint-Etienne, 1989. http://www.theses.fr/1989STET6236.
Full textAbstract:
La faculte de medecine de Saint-etienne a recu l'appellation de Faculte Jacques LISFRANC lors de son inauguration le 8-10-1988. L'etude biographique met l'accent sur l'implantation de la famille LISFRANC DE SAINT-MARTIN dans la region de Saint-Etienne, puis sur la carriere du chirurgien-chef de l'Hopital de la Pitie:sa formation aupres de G. DUPUYTREN,l'agregation, la Presidence de l'Academie de Medecine. Nous montrons ensuite comment il participa au rayonnement internationnal de l'Ecole de Paris par ses qualites de pedagogue. Une seconde partie detaille l'œuvre chirurgicale novatrice de J. LISFRANC: desarticulation tarso-metatarsienne, interventions sur le col uterin et le rectum, operations toutes precedees d'importants travaux anatomiques. Son œuvre de clinicien lui permit de rationaliser les indications chirurgicales. Nous nous attachons enfin a analyser le contexte scientifique dans lequel evoluait LISFRANC.
3
Rocha, Tanise Gomes. "Professores novatos de ciências: superando obstáculos." Universidade Federal de Pelotas, 2015. http://repositorio.ufpel.edu.br:8080/handle/prefix/2894.
Full textAbstract:
Submitted by Simone Maisonave (simonemaisonave@hotmail.com) on 2016-08-25T16:51:11Z
No. of bitstreams: 3
license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)
Tanise Gomes Rocha_Dissertacao.pdf: 895430 bytes, checksum: 46daaef6512d21d98b49a012ef65f836 (MD5)
Tanise Gomes Rocha_Produto da Dissertacao.pdf: 583216 bytes, checksum: db86edd802957931d1fc60e1168a5815 (MD5)Approved for entry into archive by Aline Batista (alinehb.ufpel@gmail.com) on 2016-08-25T16:59:26Z (GMT) No. of bitstreams: 3 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Tanise Gomes Rocha_Dissertacao.pdf: 895430 bytes, checksum: 46daaef6512d21d98b49a012ef65f836 (MD5) Tanise Gomes Rocha_Produto da Dissertacao.pdf: 583216 bytes, checksum: db86edd802957931d1fc60e1168a5815 (MD5)
Made available in DSpace on 2016-08-25T16:59:26Z (GMT). No. of bitstreams: 3 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Tanise Gomes Rocha_Dissertacao.pdf: 895430 bytes, checksum: 46daaef6512d21d98b49a012ef65f836 (MD5) Tanise Gomes Rocha_Produto da Dissertacao.pdf: 583216 bytes, checksum: db86edd802957931d1fc60e1168a5815 (MD5) Previous issue date: 2015-10-22
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES
O presente estudo consiste em uma pesquisa realizada no município de Pelotas/RS sobre a inserção na docência do professor de ciências considerado novato. Desta pesquisa participaram 10 docentes recém-ingressos no campo profissional, os quais responderam a um questionário com perguntas relativas à formação inicial e ao ingresso na profissão. A revisão bibliográfica foi de fundamental importância para compreender melhor o tema em questão e também me situar da importância mundial e no impacto da melhoria educacional que se pode alcançar dando maior assistência ao professor que está em início de carreira. Os objetivos desta pesquisa foram de compreender como ocorreu a inserção do professor novato de ciências, com quais dificuldades eles se depararam no exercício da profissão e qual a contribuição teve a formação inicial para preparar esses profissionais a atuar plenamente como docente. A metodologia utilizada foi de caráter qualitativo e investigativo e como instrumento de coleta de dados, foi aplicado um questionário semiestruturado aos professores novatos participantes da pesquisa e após esses dados foram analisados pelo método da “análise de conteúdos” (MORAES,1999), que consiste em categorização, descrição e interpretação das respostas obtidas. Os resultados demonstraram que há lacunas na formação inicial desses novatos no que se refere principalmente a desarticulação entre teoria e prática pedagógica e também evidencia a ausência de ações de inserção por parte das escolas da rede estadual de Pelotas. Ao final, é proposto um curso de formação continuada para professores novatos de ciências como uma possível solução que venha a melhorar a entrada no campo profissional docente e a preencher as lacunas da formação inicial, proporcionando ao novato um crescimento no seu modelo didático pessoal, uma maior autonomia profissional e a contribuir com a fixação na carreira docente.
This study consists of a survey conducted in Pelotas / RS on the inclusion in teaching science teacher regarded rookie. This research participated 10 freshmen teachers in the professional field, which answered a questionnaire with questions relating to the initial training and entry into the profession. The literature review was of fundamental importance to better understand the issue at hand and also my place of global importance and impact of educational improvement can be achieved by giving more assistance to the teacher who is just beginning their careers. The objectives of this study were to understand how was the insertion of the new science teacher, with what difficulties they have encountered in the profession and the contribution had initial training to prepare these professionals to fully act as a teacher. The methodology was qualitative and investigative character and as a data collection instrument was applied a semi structured to novice participants teachers of the research and after these data were analyzed by the method of "content analysis" (MORAES, 1999), which It consists of categorization, description and interpretation of the responses. The results showed that there are gaps in the initial formation of these newcomers as it mainly refers to the disconnection between theory and teaching practice and also highlights the lack of integration of actions by state schools of Pelotas. Finally, a continuing education course is proposed for novice science teachers as a possible solution that will improve the entry into the teaching profession field and fill in the gaps of initial training, providing new growth in your personal educational model, greater professional autonomy and contribute to fixing the teaching profession.
4
Nijkamp, Jet Nelly. "Novatio : schuldvernieuwing in het middeleeuwse geleerde recht /." Amsterdam : VU Uitg, 1997. http://www.gbv.de/dms/spk/sbb/recht/toc/293030693.pdf.
Full text
5
Murta, Cristina Duarte. "Uma interface para usuários novatos do sistema Patplus." Universidade Federal de Minas Gerais, 1990. http://hdl.handle.net/1843/BUOS-9LUNK2.
Full textAbstract:
This thesis presents a human-computer interface f a r novice users of PATPLUS, a f u l l - t e x t information retrieval system f o r microcamputer5. The design of t h e interface was based on a study of the literature on human-computer interfaces and interactive systems development. The main concepts and some aspects of dialogue design, interaction techniques and user types are described.E apresentada uma interface para usuários novatos do sistema PATPLUS, urn sistema de recuperação de informação em texto completo, para microcomputadores. 0 projeto da interface foi fundamentado em um estudo da literatura existente sobre o assunto, que também é mostrado. Este estudo engloba os aspectos de classificação de usuários, estilos de interação e outras questões importantes no projeto de uma interface homem-computador.
6
Camões, Ana João Duarte Afonso. "Desenvolvimento de Novos Programas para a NOVATV." Master's thesis, Faculdade de Ciências Sociais e Humanas, Universidade Nova de Lisboa, 2013. http://hdl.handle.net/10362/11639.
Full textAbstract:
Relatório de Estágio apresentado para cumprimento dos requisitos necessários à obtenção do grau de Mestre em Ciências da Comunicação – vertente de Cinema e TelevisãoO presente Relatório de Estágio, desenvolvido no âmbito do Mestrado de Ciências da Comunicação – vertente de Cinema e Televisão, centra-se no estudo e no desenvolvimento de novos programas para a NOVATV, a Web TV da Universidade Nova de Lisboa e é o complemento teórico das funções práticas exercidas na instituição de acolhimento, CITI - Centro de Investigação para Tecnologias Interativas, da mesma Universidade. O principal objetivo deste Relatório é analisar o papel da NOVATV dentro da Universidade Nova, explorando, em simultâneo, as problemáticas inerentes à Web TV no contexto de uma cultura digital emergente.
7
Duclos-Mounier, Pascale Clément Michèle. "Le roman humaniste un genre novateur français 1532-1564 /." Lyon : Université Lumière Lyon 2, 2003. http://demeter.univ-lyon2.fr:8080/sdx/theses/lyon2/2003/duclos_p.
Full text
8
Dias, Lisandra de Andrade. "Desenvolvimento de interfaces de ambientes interativos para usuários novatos." Florianópolis, SC, 2002. http://repositorio.ufsc.br/xmlui/handle/123456789/82983.
Full textAbstract:
Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia de Produção.Made available in DSpace on 2012-10-19T20:00:13Z (GMT). No. of bitstreams: 0Bitstream added on 2014-09-26T01:56:33Z : No. of bitstreams: 1 186452.pdf: 791024 bytes, checksum: 5ba75361a2a06cd1b53ff80df8a1df12 (MD5)
Este trabalho, no seu enfoque teórico, teve como objetivo compilar dados das áreas de design, ergonomia de interfaces e cognitiva, e usabilidade para o desenvolvimento de interfaces de ambientes interativos com foco primordial em usuários novatos. No seu enfoque prático, o objetivo foi desenvolver o projeto do ambiente interativo para Diagnóstico e Educação em Ergonomia à Distância (REDE) para acesso através da Internet. O ambiente interativo REDE foi desenvolvido para a formação de uma rede de diagnóstico, à distância, das Distrofias Osteomoleculares Relacionadas ao Trabalho e para a melhoria nas atividades produtivas dos trabalhadores rurais. O ambiente interativo REDE estará disponível para acesso nos ambientes interativos da Empresa de Pesquisa Agropecuária e Extensão Rural de Santa Catarina (Epagri) e do Laboratório de Ergonomia e Projeto do Trabalho (LEPT) da Universidade Federal de Santa Catarina (UFSC). Para o desenvolvimento do ambiente interativo REDE foi realizada pesquisa para identificação do perfil do usuário, recursos tecnológicos para acesso e interesse pela informação disponível neste ambiente interativo. A etapa seguinte foi a aplicação dos critérios ergonômicos de Bastien e Scapin (1993) para avaliação do ambiente interativo da Epagri que serviu de referência gráfica para o ambiente interativo REDE. Com o resultado desta avaliação, foi desenvolvido o ambiente interativo REDE de acordo com as recomendações ergonômicas destes autores.
9
Duclos-Mounier, Pascale. "Le roman humaniste : un genre novateur français 1532-1564." Lyon 2, 2003. http://theses.univ-lyon2.fr/documents/lyon2/2003/duclos_p.
Full textAbstract:
Alors qu'à la Renaissance le roman est partagé, théoriquement, entre inexistence et bâtardise et sociologiquement, entre corruption et délectation, des praticiens ont une conscience assez nette de la liberté formelle qui carctérise le genre pour lui conférer une originalité inconnue de leurs contemporains et seulement ébauchée par leurs prédécesseurs. Ces quelques romanciers ont la particularité de fonder une poétique à nouveaux frais à partir de matériaux linguistiques le plus souvent anciens. Ce faisant, ils prennent le parti de démarquer leur art, qu'ils ne se risqueront jamais à qualifier de "romanesque", tant des formes de romans héritées du Moyen Age ou importées de l'étranger que des recueils narratifs variés. Confronté au foisonnement de la langue, le lecteur se voit invité à réfléchir à une facture problématique qui rassemble autant d'énoncés divers que de conceptions du monde contradictoires. C'est à un mode de discussion et de pensée qu'entend le former le roman humanisteWhile during the Renaissance romance is divided, theoretically, between nonexistence and bastardy and, sociologically, between corruption and delectation, writers are enough aware of the formal freedom which defines the genre to confer on it an originality unknown by their contemporaries and only sketched out by their predecessors. These few romancers are characterised by the creation of a new poetics stemmed from usually old linguistic material. This way, they resolve to dissociate their art - that they will never go so far as to "romance" - from the forms of romances handed down by the Middle Ages or imported from abroad as well as from the various narrative collections. Confronted with the flourishing of the language, the reader is invited to think about a problematic composition which gathers as many utterances as contradictory conceptions of the world. The humanistic romance intends to form his mind to a mode of questioning and of dialogue
10
Cerda, Muñoz Javiera. "Percepción del autocuidado en psicólogos clínicos novatos y experimentados." Tesis, Universidad de Chile, 2012. http://www.repositorio.uchile.cl/handle/2250/117121.
Full textAbstract:
PsicólogaDesde la década del 60, progresivamente ha ido creciendo el interés de los profesionales de la salud por el proceso de desgaste emocional que pueden vivir algunos de ellos quienes, en su trabajo, se relacionan constantemente con el sufrimiento humano. Respecto a esto, durante los últimos años en Chile, los trabajadores de la salud han ido solicitando progresivamente la consideración del riesgo y la protección para ellos en el área de la salud mental, llamándola autocuidado. En este contexto, la presente investigación se enfoca en el autocuidado en los psicólogos clínicos, ya que forman parte de los profesionales de la salud que trabajan con el sufrimiento humano, por lo que se encuentran potencialmente expuestos a una serie de riesgos, que pueden derivar en desgaste emocional, motivo por el cual cobra importancia el autocuidado ya que es una práctica que ayuda a proteger el bienestar de los terapeutas. El objetivo de la investigación es describir la percepción que tienen los psicólogos clínicos novatos y experimentados sobre el autocuidado y dar cuenta si hay o no diferencias entre ambos grupos. El estudio es de tipo cualitativo, exploratorio-descriptivo, con un diseño no-experimental de tipo transversal. La muestra es no probabilística e intencionada, de sujetos tipo, compuesta por 24 terapeutas divididos en dos grupos de acuerdo al nivel de experiencia; 12 novatos (1.5 a 3.5 años de experiencia) y 12 experimentados (15 o más años de experiencia). El instrumento utilizado es una entrevista semi-estructurada. En cuanto a los resultados, se encontraron tanto similitudes como diferencias en la percepción del autocuidado en psicólogos clínicos novatos y experimentados en los distintos sub-temas del autocuidado que se investigaron
11
Khadour, Lina. "Total quality environmental management (TQEM) framework towards sustainability (UK Novated D&B principal contractors)." Thesis, Nottingham Trent University, 2010. http://irep.ntu.ac.uk/id/eprint/124/.
Full textAbstract:
To reduce the substantial environmental damage of the built environment, contractors have to comply with an increasing number of environmental building regulations. Apart from the purely practical implications of compliance, there is a perception of a gap emerging from not joining up the construction cycle with management-based solutions for performance development, especially in newer areas of interest such as the environment and sustainability. Research has shown that out of the variety of the procurement routes the UK construction industry offers, there has been a continuous increase in the use of novated Design-and-Build (D&B) over the last 15 years. Many clients regard it as providing value for money and the contractors see it as an opportunity to apply their key strengths in management and coordination of design and construction works. The situation of high adoption of D&B, despite its poor quality and environmental performance, motivated this research to develop a management-based solution for performance improvement from the novated D&B principal contractors’ perspective. To date, the bulk of empirical research on environmental management issues has been directed toward quality, strategy, supply chain, and process management. The development of Total Quality Environmental Management (TQEM) may improve environment, quality, sustainability, client’s value for money, and at the same time reduce contractors’ risks. TQEM has emerged, in the manufacturing sector, from integrating strategic Environmental Management (EM) into the holistic approach of Total Quality Management (TQM). TQEM embodies four key principles: customer identification, continuous improvement, doing the job right the first time and a system approach. The impact of TQEM on construction management, design, performance, and procurement are not always as visible to the end-users as they are to the contractor. To be able to define these elements in a construction project, contractors’ perspectives need to be studied with regard to the corporate-level TQEM (cultural and business aspects) and project-level TQEM (construction performance and procurement arrangements). The aim of this research therefore is to establish the suitability of TQEM for D&B main contractors across the major classification of project types. The triangulation approach in the study combines two levels for investigation; a survey and case studies. There are two main reasons for selecting this approach: 1) the two different methods are used for different purposes as the survey focuses on corporate-level TQEM while the case studies are concerned with the project-level TQEM; and 2). This use of multi-methods enables triangulation to take place in order to ensure that the data is reliable. For the survey, a primary group of top D&B contractors who are likely to be most affected by the new environmental regulations are included in the sample frame. For the case studies, within the three selected reputable D&B main contractors, secondary groups of top, middle and project level managers’ opinions, are investigated. The findings illustrate the demand for TQEM and suggest extending TQEM processes over the project development stages. The survey results are analyzed to refine a primary TQEM framework which would hopefully be sufficiently general for implementation purposes. Understanding the case studies’ informants’ professional standing and the significance of their comments is enhanced for ensuring the primary TQEM framework external validity. The framework is developed further through the provision of rich, thick detailed description out of the case studies which allow any other D&B contractor interested in transferability to have a solid framework for comparison. Hence, this research provides the basis for further studies into how TQEM can be enhanced in a way that will provide contractors with sustainable competitive advantages. The research contribution to knowledge is born from reasoned reflections and principled convictions. A new concept of Const.TQEM and a new framework for performance improvement towards sustainability for novated D&B main contracts are developed by this research. The Const.TQEM framework has a potentially massive impact on the timing and nature of the design, of contractor intervention, recognition, and of the contractual and working relationships of the parties involved in a project. By picturing the interaction between the whole parties involved in a novated D&B project, this new framework overcomes many of the shortcomings of the conventional D&B method of construction procurement, enables greater concurrency in design development and project planning, balances priorities, and generates realistic plans. A combination of originality & credibility increased resonance and usefulness and subsequently value of contribution. This research develops a solution for the gap found in the literature by refining and extending current practices of compliance with the new environmental regulations from the design phase, to the managerial and procurement arrangements picturing the interaction among all the parties involved in a project realisation.
12
Darnley, Matthew J. "Automated searches for extragalactic novae." Thesis, Liverpool John Moores University, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.419965.
Full text
13
Williams, S. C. "Extragalactic novae and their progenitors." Thesis, Liverpool John Moores University, 2014. http://researchonline.ljmu.ac.uk/4595/.
Full textAbstract:
Novae are binary systems containing a white dwarf (WD) and a less-evolved companion star, either a main-sequence, sub-giant or red giant star. The WD accretes matter from the companion through Roche lobe overflow or via a stellar wind. As material is accreted, the pressure and temperature at the base of the accreted envelope increase until a thermonuclear runaway occurs. This causes a sudden increase in brightness (the outburst), which ranks among the most luminous stellar astrophysical phenomena. Following the outburst, some novae form detectable dust in the ejecta. Observationally, there is a correlation between the dust-formation timescale and the time it takes the nova to fade optically by two magnitudes, which was emphasised in a study of infrared emission from novae in the Andromeda Galaxy (M31). In the first part of this thesis, a simple theoretical model is presented, which considers the higher-energy photons produced by the nova being absorbed by neutral hydrogen in the ejecta, before they can reach the potential dust-formation sites. This new model successfully replicates the observed trend between these two parameters and agrees well with the observational data. The majority of novae are thought to consist of a WD and a main-sequence star, although some systems harbour a sub-giant (SG-novae) or red giant (RG-novae) companion instead. In the Milky Way galaxy, relatively few RG-novae have been confirmed, although in many systems, the evolutionary state of the secondary is simply not known. There is evidence that the progenitors of some Type Ia supernovae (SNe Ia) may be RG-nova systems (e.g. SN PTF11kx), therefore it is important to understand the population of such systems. In this thesis, archival Hubble Space Telescope (HST) data are used to search for RG-novae in M31. Many more novae are discovered in M31 each year (~30) than in the Milky Way (~10). Distance determination is a major complication when studying Galactic novae. However, at the distance of M31 all the novae may be considered to be at the same distance, making M31 an excellent environment for studying nova populations. We conducted a survey of 38 spectroscopically confirmed M31 novae in quiescence. We determined that 11 of these systems had a coincident progenitor candidate whose probability of being a chance alignment with a resolved source in the HST data was ≤5%. As the main sequence and the majority of the sub-giant branch are not resolvable in the HST data, this implies that a significant proportion of these systems contain red giant secondaries. The light curves of several M31 novae are also presented here, some of which use HST data to extend the light curves far deeper than is typically possible for extragalactic systems. A statistical study was then carried out to test the results of the survey and derive an estimate of the proportion of M31 novae associated with a resolved source in the HST data. This includes, for example, models of the spatial distribution, speed class and peak magnitude of the M31 nova population, as well as considering biases introduced by the HST coverage of M31. The initial results suggest about 0.38 of M31 novae are associated with a source in the HST data, a class of objects expected to be dominated by RG-novae. This is a much greater proportion than that observed so far in our Galaxy, and will be important when considering such systems as potential SN Ia candidates. The spatial distribution of novae that have resolved progenitor candidates is consistent with these systems being associated with the M31 disk, rather than the bulge. The method used to locate the progenitors of M31 novae was also used to study three additional systems. The M31 nova, M31N 2008-12a, which appears to be a recurrent nova (RN) with a very short inter-outburst period, produced an outburst in November 2013. This outburst was studied and a candidate progenitor system was found in HST data when it was apparently in quiescence, supporting its classification as a RN with a high accretion rate. The method was also used to explore upper limits on the brightness of the progenitor of SN 2014J, a SN Ia in M82, although no progenitor was found, a RG-nova (or in-fact any type of system) could not be ruled out due to the limitations of the data. For the M31 transient TCP J00403295+4034387, which showed an unusual spectrum, archival HST data were used to show the object was probably a blend of two objects with a very small apparent separation. Finally, the thesis is summarised, and future work on both dust formation and the progenitor search are discussed.
14
Aydi, Elias. "Multiwavelength studies of classical novae." Doctoral thesis, University of Cape Town, 2018. http://hdl.handle.net/11427/29576.
Full textAbstract:
Classical novae are transient astronomical events resulting from an eruption on the surface of an accreting white dwarf in interacting binary stars, namely cataclysmic variables. These eruptions and their progenitors are ideal astronomical events/objects to study a variety of interesting topics, such as mass-transfer mechanisms, binary evolution, and thermonuclear and radiative emission processes. Novae share some general observational characteristics during their eruption phases, yet each nova is new and can show unique light-curve and spectral developments. Therefore, carrying out detailed multiwavelength studies of individual novae is important to provide an holistic picture of the eruption development with the ultimate aim of a general understanding of the physical mechanisms involved in nova eruptions, as well as the structure and evolutionary condition of their progenitors. This dissertation presents detailed multiwavelength studies of three nova events, namely V5852 Sgr, SMCN 2016-10, and V407 Lup, as a series of chapters (papers). Our data were collected using several ground-based and space telescopes including: high- and mediumresolution optical spectroscopy from SALT, SOAR, and FLOYDS, optical and near-infrared photometry from IRSF, OGLE and SMARTS, UV and X-ray data from Swift, Chandra, and XMM-Newton. In the second chapter, we present an optical and infrared study of the unusual nova V5852 Sgr. This nova is a moderately fast nova showing features of the Fe II spectroscopic type. The light-curve development is unique, showing a combination of several light-curve classes. Estimates of the distance and measurements of the line velocities suggest that the nova might be associated with the Sagittarius stream. If so, it would be the first nova to be discovered in a dwarf spheroidal galaxy. The third chapter presents a multiwavelength study of the very fast nova SMCN 2016-10a. The fast light-curve development suggests that the system hosts a massive white dwarf (& 1.25 M), in good agreement with the high temperature of the super-soft X-ray emission and the turn-on/turn-off time of the super-soft state. At the distance of the Small Magellanic Cloud our measurements suggest that SMCN 2016-10a is the brightest nova in the Small Magellanic Cloud and one of the brightest novae on record, with an absolute maximum magnitude of ∼ −10.5 in the V -band. Chapter four is a multiwavelength study of nova V407 Lup. With a light-curve decline time t2 ≤ 2.9 d, this is one of the fastest known examples and the white dwarf is possibly more massive than 1.25 M. Our set of optical, UV, and X-ray data suggest that this system is an intermediate-polar cataclysmic variable based essentially on the presence of two periodicities (3.57 h and 565 s) in the light-curves. These periodicities are attributed to the orbital period of the binary and rotational period of the white dwarf. The late optical spectra (taken from day 165 post-eruption) show narrow and moving lines of He II and O VI, possibly associated with accretion regions within the binary system. This, along with the X-ray light-curves and spectra, suggest that the accretion probably resumed around 168 days post-eruption. These studies are modest, yet essential steps in the quest for a better understanding of nova eruptions. They also demonstrate the importance of multiwavelength follow-up of novae for constraining the physical parameters of the eruption, the ejecta, and the properties of the progenitor. In the era of large all-sky surveys, such as the All-Sky Automated Survey for Supernovae and eventually the Large Synoptic Survey Telescope which have been and are ex- pected to find a large number of optical transients and classical novae, similar multiwavelength follow-up will play a crucial role for initially identifying these transient events and further understanding their physical behaviour.
15
Maxwell, Michael. "Multiband observations of recurrent novae." Thesis, University of Central Lancashire, 2014. http://clok.uclan.ac.uk/10719/.
Full textAbstract:
Recurrent novae are binary systems which undergo outbursts due to a thermonuclear runaway on a timescale of decades. Two systems, U Scorpii and RS Ophiuchi, are the main focus of this thesis having gone into outburst in 2010 and 2006 respectively. Optical and near-IR spectroscopy of U Sco obtained with facilities including the Liverpool Telescope, the Very Large Telescope, and the Southern African Large Telescope, as well as ultra-violet and optical spectroscopy of RS Oph obtained with the Ultra-Violet and Optical Telescope, are presented here. Observations of U Sco obtained in outburst are used to determine the helium abundance of the ejecta, with observations in quiescence used to constrain the nature of the companion star and the accretion disc. Observations of RS Oph are used to produce lightcurves of the decline from maximum to the post-outburst minimum. Analysis of optical and near-IR spectra following the 2010 outburst of U Sco leads to the determination of the reddening and the helium abundance. The reddening is found to be E(B-V) = 0.17 ± 0.14, consistent with previous estimates. The helium abundance, N(He)/N(H), is determined to be 0.122 ± 0.018, lower than previous estimates and suggesting that the companion is not helium rich. The fitting of model stellar atmospheres to observations of U Sco in quiescence, obtained ∼18-30 months after the 2010 outburst, constrains the effective temperature of the companion and indicates that it is a cool F or hot G star. The accretion disc is found to be still in a state of development until at least ∼18 months after outburst, contrary to previous studies. The strength of the Heii 4686 ̊A line in quiescence is found to be consistent with a high mass white dwarf accreting solar-abundance material at a high rate. The He line strengths do not require an overabundance of helium, as has been previously suggested, consistent with the solar abundance of helium found in the ejecta of the 2010 outburst. UVOT observations of RS Oph following the 2006 outburst are used to produce B and u′ lightcurves of the decline to minimum. These lightcurves are used in con- junction with published V and B lightcurves to show the change in the colour of the system throughout the outburst. Spectra of RS Oph show the spectroscopic evolution during the initial decline, plateau, final decline, and post-outburst minimum phases. SALT spectra obtained during the late decline phase of the 2011 outburst of a third recurrent nova, T Pyxidis, are used to derive a helium abundance of N(He)/N(H)= 0.161 ± 0.013, approximately twice the solar value. Very strong [O iii] lines are also detected.
16
Kaser, Pierre. "L'oeuvre romanesque de Li Yu (1611-1680) : parcours d'un novateur." Paris 7, 1994. http://www.theses.fr/1994PA070110.
Full textAbstract:
Notre examen de l'œuvre romanesque de Li Yu s'appuie sur une étude philologique qui nous a permis d'en délimiter le corpus à trente récits courts publiés en deux collections, Wushengxi ("les théâtres silencieux" : douze contes parus en 1655, six en 1656) et Shi'er lou ("les douze tours", 1658), ainsi qu'un roman érotique en vingt chapitres, Rou Putuan ("le tapis de chair", 1657). Le contexte s'avérant insuffisant pour en expliquer la brièveté, nous envisageons l'abandon du genre comme la résultante d'une perpétuelle exigence de nouveauté et le refus de Li yu de l'aborder dans un format plus ample. D'abord champ d'exploration très attractif pour un écrivain professionnel guide par la recherche d'un équilibre entre la "vulgarité" du genre et le "raffinement" de l'intention créatrice, le roman devint le ferment d'une œuvre d'essayiste et d'une création dramatique incomparables. L'étude de l'influence de ce novateur au parcours atypique montre enfin que Li Yu avait ouvert une voie sur laquelle il ne fut pas suivi. Les attributions de romans à Li Yu, à l'exclusion d'une ébauche de commentaire au "roman des trois royaumes", et un court "roman en chinois classique ue" sont réfutées en appendiceOOur study of Li Yu's fiction is based on a philological approach that allows us to delimit his work to a total of thirty short stories published in two collections, Wushengxi ("silent operas", twelve stories in 1655, six in 1656), Shi'er lo u ("twelve towers", 1658) and an erotic novel in twenty chapters, Rou Putuan ("carnal prayer mat", 1657). The context proving to be insufficient to explain its briefness we consider it as the result of a perpetual need of originality and Li Yu's unwillingness to explore the genre in a longer dimension. At first an experimentation ground particularly appealing for a professional writer guided by the search for a balance between the simplicity of vernacular fiction and the refinement of his creative attitude, the fiction became the springboard for his essays and his dramas. The study of Li Yu's influence shows that he opened a path on which he has not been followed. All attributions of novels to Li Yu, except an outline of a commentary to the "romance of the three kingdoms", and a single short story in classical chinese, are refuted in an appendice
17
Delgado, Laura. "High energy emission from recurrent novae." Doctoral thesis, Universitat Autònoma de Barcelona, 2017. http://hdl.handle.net/10803/457852.
Full textAbstract:
En los últimos años muchas novas- ocho clásicas y dos recurrentes- han sido detectadas por Fermi/LAT a E$>$100 MeV. En la mayoría de los casos esta emisión se observa pronto después de la explosión, alrededor del máximo en óptico, y por un corto periodo de tiempo. La emisión en rayos $\gamma$ a muy altas energías es una consecuencia del decaimiento del $\pi^{0}$ y/o del Compton Inverso, los cuales están relacionados con la aceleración de partículas (p and e$^{-}$) en el choque que produce el material eyectado al encontrarse con el medio circumestelar. RS Oph (2006) fue la primera nova para la cual la aceleración de partículas fue predicha. Esta predicción mostró que la onda de choque desaceleró más rápido de lo esperado como consecuencia de la aceleración de partículas en el choque y su posterior fuga. El objetivo de nuestra tesis es el estudio de la evolución de las novas simbióticas recurrentes los primeros días después de la explosión y la naturaleza de su emisión. Este trabajo tiene el propósito de realizar un amplio estudio sobre el último estallido de RS Oph y V745 Sco en varias longitudes de onda diferentes. \\
RS Oph es una nova recurrente en un sistema simbiótico compuesto por una enana blanca y una gigante roja con un periodo de recurrencia de $\sim$21 años. En este trabajo presentamos un nuevo análisis de las observaciones realizadas por el satélite XMM-Newton a RS Oph los primeros días después de la explosión de 2006 con los instrumentos EPIC-MOS y RGS. Comparamos estos resultados con la temperatura, absorción, flujo y "emission measure" obtenidos por las observaciones realizadas con RXTE, Swift y Chandra, y los resultados de los estudios previos sobre las observaciones de RGS. También fue estudiada la evolución de los primeros días de la emisión en radio e IR. La combinación de los estudios de las diferentes longitudes de onda nos permite tener una visión global del plasma chocado en RS Oph y su relación con la aceleración de partículas.\\
V745 Sco es también una nova recurrente en un sistema simbiótico con un periodo de recurrencia de $\sim$25 años. Presentamos el análisis de las observaciones de V745 Sco los primeros días después de la explosión realizadas por el satélite Swift/XRT simultáneas a la detección de Fermi. Combinamos estos resultados con los obtenidos del análisis de las observaciones de NuStar y Chandra para tener una imagen global de la evolución del material eyectado por la nova. Al igual que en el caso de RS Oph recopilamos toda la información que hay sobre las observaciones en IR y en radio de los primeros días después de la explosión. Finalmente, la aceleración de partículas en V745 Sco puede ser explicada con un modelo de choque difuso en la onda de choque y la posterior fuga de partículas a muy altas energías como en el caso de RS Oph.\\
Con el estudio de RS Oph y V745 Sco y su comparación, demostramos por primera vez que las novas recurrentes en un sistema simbiótico tienen características comunes en los primeros días de la evolución del remanente de la nova y en la aceleración de partículas. Los resultados de los estudios en diferentes longitudes de onda proporcionan nuevas perpectivas sobre la evolución del plasma y la interacción con el material circumestelar siendo estos una poderosa herramienta para conocer la naturaleza de la emisión de rayos $\gamma$.In recent years, several nova explosions - eight classical novae and two symbiotic recurrent novae - have been detected by Fermi/LAT at E$>$100 MeV. In most cases, this emission has been observed early after the explosion, around the optical maximum, and for a short period of time. The high-energy $\gamma$-ray emission is a consequence of $\pi^{0}$ decay and/or Inverse Compton, which are related to particle (p and e$^{-}$) acceleration in the strong shock between the nova ejecta and the circumstellar matter. RS Ophiuchi (2006) was the first nova for which particle acceleration was predicted. This prediction showed that the blast wave decelerated faster than expected as a consequence of the acceleration of particles in the shock and their escape. The aim of our thesis is to study the evolution of the symbiotic recurrent novae the first days after the outburst and the nature of their emission. The present thesis work has been aimed to perform a comprehensive multiwavelength study of the last outburst of RS Oph and V745 Sco.\\ RS Oph is a recurrent nova in a symbiotic system composed of a white dwarf and a red giant with a recurrence period of $\sim$21 years. In this work, we present a new analysis of XMM-Newton's observations of RS Oph early after its 2006 outburst both with RGS and EPIC-MOS. We compare these results with temperatures, emission measures, absorptions and fluxes obtained for RXTE, Swift and Chandra observations, and previous studies of RGS observations. The evolution of the radio and IR emissions during the first days after the outburst were studied. The multiwavelength studies allow us to get a global picture of the shocked plasma and its relationship with the particle acceleration. \\ V745 Sco is also a symbiotic recurrent nova with a recurrence period of $\sim$25 years. We present the analysis of the \textit{Swift}/XRT observations of V745 Sco early after its 2014 outburst simultaneous to \textit{Fermi} detection. We combine our results with \textit{Chandra} and \textit{NuStar} observations to get a global picture of the evolution of the nova ejecta. As in RS Oph we compiled all the radio and IR information about V745 Sco the first days after the explosion. Finally, particle acceleration in V745 Sco can be explained by a diffusive shock model at the blast wave and the subsequent escape of the very high energy particles as in RS Oph.\\ With the study of RS Oph and V745 Sco, and its comparison, we demonstrate for the first time common features in the early evolution of a nova remnant and their relationship with particle acceleration in the symbiotic recurrent novae. Multiwavelength results provide new insights into the evolution of the shocked plasma and the interaction with the circumstellar material, being a powerful tool to understand the nature of the $\gamma$-ray emission.
18
Wood, J. H. "The structure of eclipsing dwarf novae." Thesis, University of Cambridge, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383939.
Full text
19
Hounsell, Rebekah. "The outbursts and environments of novae." Thesis, Liverpool John Moores University, 2012. http://researchonline.ljmu.ac.uk/6158/.
Full textAbstract:
Classical and Recurrent novae (CNe/RNe) are interacting close binary systems in which mass is transferred from a donor star to the surface of an accreting compact companion resulting in an outburst. Their study is important for our understanding of several branches of modern day astrophysics. The work presented in this thesis has focused on three particular topics: (i) Nova V458 Vulpeculae and its surrounding planetary nebula; (ii) Detailed nova light curves from the Solar Mass Ejection Imager (SMEI); and (iii) Vl721 Aquilae, an usually fast, luminous, and highly extinguished nova. A brief account is also given of more generalised work on novae in M31, and areas for future investigation are discussed. Nova V458 Vulpeculae is one of only two novae observed to lie within a planetary neb- ula (PN). Due to the outburst a light echo effect within the PN is experienced. Using Ha data taken over four years the illumination of the PN with time has been examined and a 3D visualisation obtained. Comparison of light echo data from PN models gen- erated with the morphokinematical modelling tool XS5 to observed PN light echo data indicate the presence of a PN with a bipolar external shell and an elliptical internal shell. Results have also confirmed that the PN is at a distance of 13 kpc. SMEI is a space-borne instrument based on-board the Coriolis satellite. It provides precision visible-light photometry of point sources down to 8th magnitude and near complete sky-map coverage at 102-minute cadence. Using SMEI data detailed light curves of novae have been obtained which offer unprecedented temporal resolution around, and especially before, maximum light, a phase of the nova eruption normally not covered by ground-based observations. They have allowed the exploration of fun- damental parameters for individual objects including the epoch of the initial explosion, the reality and duration of any pre-maximum halt, the presence of secondary maxima, speed of decline of the initial light curve, plus precise timing of the onset of dust for- mation. The SME1 data archive undoubtedly holds a plethora of transient events and variable stars. A code designed to search for such events has been created and imple- mented on four years of SME1 data from one of its three cameras generating over 1500 variable objects, some of which were un-catalogued and are potentially very interest- mg. Finally data on the unusually fast and luminous Nova Vl721 Aquilae has been exam- ined. Pre-outburst N1R images from the 2MASS catalogue revealed the presence of a progenitor system, the absolute magnitudes and colours of which suggested the object to have a sub-giant secondary, and so belong to the U Sco class of RNe. Post-outburst spectra of the object revealed the presence of triple-peaked Ha and 01 profiles. Spec- tral fitting of these profiles indicated a high ejection velocity of 3350 km S-l. The triple-peaked nature of the Ha profile suggested that the accretion disc of the system is viewed face-on. This is supported by models created in XS5, which also indicated an axis ratio of rv 1.4 for the ejecta.
20
Bouffard, Landry Daniel. "Algorithme novateur de contrôle d'un miroir déformable à base de ferrofluide." Thesis, Université Laval, 2012. http://www.theses.ulaval.ca/2012/29383/29383.pdf.
Full text
21
BARBOSA, Yuri de Almeida Malheiros. "Um sistema de recomendação de código-fonte para suporte a novatos." Universidade Federal de Pernambuco, 2011. https://repositorio.ufpe.br/handle/123456789/2737.
Full textAbstract:
Made available in DSpace on 2014-06-12T16:00:44Z (GMT). No. of bitstreams: 2
arquivo6895_1.pdf: 1091353 bytes, checksum: a93fceac2e2a0d3c9f500615e3a1eebe (MD5)
license.txt: 1748 bytes, checksum: 8a4605be74aa9ea9d79846c1fba20a33 (MD5)
Previous issue date: 2011Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Novatos em um projeto de desenvolvimento de software costumam ter problemas nas suas primeiras tarefas, porque antes de tornarem-se produtivos como os desenvolvedores mais experientes, eles precisam aprender as ferramentas, como o código-fonte está organizado, como todo projeto funciona, entre outras atividades. Muitas vezes, para ensinar a um novato o que ele precisa, um mentor, alguém mais experiente no projeto, é alocado para guiá-lo nos seus primeiros passos. Durante o desenvolvimento de software os desenvolvedores interagem com sistemas de controle de versão, sistemas de controle de mudanças e listas de discussão. Todas essas ferramentas gravam artefatos e a este conjunto de dados damos o nome de memória do projeto. Sistemas de recomendação podem ajudar os desenvolvedores usando a memória do projeto para recomendar artefatos importantes e assim evitar a necessidade de comunicação contínua entre as pessoas. Usando um sistema de recomendação os desenvolvedores perguntam primeiro para o computador, portanto eles só precisam perguntar para outro desenvolvedor se o sistema de recomendação falhar em guiá-lo para a resposta correta. Este trabalho apresenta a criação de um sistema de recomendação para Engenharia de Software chamado Mentor. Seu objetivo é recomendar arquivos de código-fonte que devem fazer parte da solução de uma solicitação de mudança. Além disso são apresentados e discutidos os resultados de três experimentos realizados para comparar técnicas de atribuição de similaridade utilizando os dados dos projetos GTK+, Hadoop e GIMP. Usando o PPM para atribuir similaridade foram conseguidos resultados para recall rate entre 38,82% e 66,8%, e utilizando o LSI os resultados variaram entre 24,6% e 47,6%
22
Binder, Fernando Pereira. "Profissionais, amadores e virtuoses: piano, pianismo e Guiomar Novaes." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/27/27157/tde-13092018-153941/.
Full textAbstract:
Esta pesquisa estuda a atividade pianística no século XIX e início do século XX no Rio de Janeiro e em São Paulo. Inscrito no campo da história social da música, o trabalho problematiza a afirmação segundo a qual a disseminação do piano, seu ensino e seu cultivo foram resultado de uma exigência social imposta às mulheres em função do matrimônio e da maternidade. Como, então, uma atividade descrita como mero verniz cultural produziu uma pianista como Guiomar Novaes? Os objetivos da pesquisa foram investigar as práticas musicais pianísticas amadoras em São Paulo e desvendar a mobilização de mulheres, estrangeiros e repertórios musicais como ferramenta de modernização cultural durante a Belle Époque paulista. Como ferramenta analítica uso o conceito de mundo artístico de Howard Becker, cujo objetivo é compreender a complexidade das redes de cooperação que produzem obras de arte. Para Becker, a arte é fruto do trabalho coletivo feito de maneira rotineira que produz padrões de atividade coletiva. Ao analisar a reputação de um artista poderemos reconstruir os padrões de funcionamento e a atuação dos diferentes participantes daquele mundo artístico na criação daquela reputação. Logo, o exame da criação da reputação de artista de Guiomar Novaes alcançada em 1915 deve revelar o modo de funcionamento do mundo do piano paulistano. O trabalho organiza-se em duas partes: a primeira trata do surgimento do mundo do piano no Rio de Janeiro. Nela estudo as convenções musicais embutidas no próprio piano, sua ligação com a assimilação da cultura letrada europeia, o papel dos comerciantes e impressores de música, e também estudo como raça, gênero e classe ajudaram a conformar o amadorismo e profissionalismo na primeira metade do século XIX, e o papel da Igreja e do Estado nesse processo. A segunda parte conta a história do pianismo paulistano. Nos dois primeiros capítulos retomo os temas do comércio do instrumento, seus espaços de difusão e seus participantes e analiso o repertório de Guiomar Novaes entre os anos de 1902 a 1915. Os dois últimos capítulos analisam a operação do mundo do piano na criação da reputação de Guiomar Novaes. A análise da reputação de Guiomar Novaes revelou o funcionamento do mundo do piano paulistano. A análise também revela atores e relações sociais mais complexas do que amadoras frustradas e concertistas internacionais. A exigência do aprendizado musical criou um mercado para professoras e professores, estimulou o comércio, a crítica e o periodismo musical. Ao dar caráter público à apresentação de suas alunas, o italiano Luigi Chiaffarelli, professor de Guiomar Novaes, conseguiu criar um público regular, especializado e socialmente influente. Enquanto a menina estudava, seu professor e o jornalista Gelásio Pimenta mobilizaram recursos humanos e materiais, públicos e privados necessários ao desenvolvimento da carreira dela. A consagração de Guiomar no exterior provava à elite da Belle Époque paulistana o sucesso do seu projeto de modernização, São Paulo rivalizava com as nações \"civilizadas\". No Brasil, os recitais de Guiomar criavam oportunidades para a plateia experimentar sentimentos patrióticos de forma pessoal, fortalecendo laços com uma nova identidade nacional.This research explores pianistic activity in Rio de Janeiro and Sao Paulo in the nineteenth and early twentieth centuries. Pertaining to the social history of music, this study problematizes the assertion that the dissemination of the piano, its teaching and its cultivation were the result of a social requirement imposed on women by marriage and maternity. How, then, could an activity described as mere \"cultural veneer\" produce a pianist like Guiomar Novaes? The objectives of this research were to investigate the amateur pianistic musical practices in Sao Paulo and unveil the mobilization of women, foreigners and musical repertory as implements for cultural modernization during the Belle Epoque of Sao Paulo. As an analytical tool, I use Howard Becker\'s concept of the \"artistic world,\" the objective being to understand the complexity of the cooperation networks that produce works of art. For Becker, art is the fruit of collective work done routinely, which, in turn, produces patterns of collective activity. In analyzing the reputation of an artist, we can reconstruct the role-patterns and actions of the different participants of a particular artistic sphere in the creation of his or her reputation. Therefore, the examination of the creation of Guiomar Novaes\' reputation, as firmly established already in 1915, should certainly reveal the workings of the pianistic realm of Sao Paulo. The work is organized in two parts: the first deals with the emergence of the piano and its cultivation in Rio de Janeiro. Here, I examine the musical conventions surrounding the piano itself, its connection with the assimilation of the literate culture of Europe, the role of music merchants, editors and printers, and also the roles of race, gender and class which helped to form both amateurism and professionalism in the first half of the nineteenth century. I also study the participation of the church and government in this process. The second part tells the story of the piano in Sao Paulo. In the first two chapters of this section I return to the themes of the piano and commerce, the spreading of the piano\'s popularity and its performers. I also analyze the repertory performed by Guiomar Novaes from 1902 to 1915. The last two chapters analyze the contribution of the piano\'s cultivation in the creation of Guiomar Novaes\' reputation. The analysis of her reputation, in turn, reveals the mechanisms of the piano\'s cultivation in Sao Paulo. It also reveals complex social roles and relationships that are more than mere descriptions of frustrated amateurs and international performers. The demand for musical learning created a market for teachers and stimulated trade, criticism and musical journalism. Through the public performances of his students, the Italian Luigi Chiaffarelli, one of Guiomar Novaes\' teachers, was able to create a consistent, specialized and socially influential audience. Even as the young Guiomar practiced, her teacher and journalist Gelasio Pimenta mobilized human and material resources, both public and private, which were critical for the development of her career. Guiomar\'s consecration abroad was held as proof to Sao Paulo\'s Belle Epoque elite of the success of its modernization project, showing that Sao Paulo rivalled \"civilized\" countries. In Brazil, Guiomar\'s recitals created opportunities for audiences to experience deep and personal patriotic feelings, thus strengthening the bond with a new national identity.
23
Bangerter, Adam Glenn. "Collaborative development: exploring residential design alternatives in Novato, California." Kansas State University, 2014. http://hdl.handle.net/2097/17624.
Full textAbstract:
Master of Landscape ArchitectureDepartment of Landscape Architecture/Regional and Community Planning
Howard Hahn
In Novato, California, zoning regulations and the city’s urban growth boundary (UGB) have restricted development on open agricultural and hillside land outside the city. These restrictions have added to a shortage of affordable homes in Novato in spite of a demand for housing. Population growth estimates suggest that this demand will continue and strategic development of land outside the current city boundaries will need to occur in order over the next 15-20 years (Bay Area Census Data 2010 and Heid 2004). This report outlines a process of land development which evaluates the success of a development alternative relative to what the land owners, developers and the community want, need, and value. This process involved producing four community design alternatives of varying housing densities for an 867 acre parcel of land just beyond Novato’s UGB. The alternatives were: high density (556 homes), medium density (224 homes), low density (14 homes), and low density + land swap (72 homes). Using a systematic scoring process, each alternative was evaluated based on what the land owner, developer, and the community valued in the development and then awarded each a feasibility score. This score represents likelihood of implementation. The higher the feasibility score, the more likely the alternative could be pursued as a development option. The high density alternative (556 homes) received the lowest feasibility score. It met many of the land owner and developer values, but few of the community values. The low density + land swap alternative (58 homes) received the highest feasibility score. This alternative met nearly all of the developer and owner values as well as the community values. The land swap option of this alternative was unique and made this design more feasible. The swap identified land areas on the site property that could be traded for developable land inside the city boundary allowing Novato to maintain the rural character of the city fringe, while giving the developer land that could be used for future development. This alternative is a compromise that adequately addresses the values of all involved and is therefore recommended as the most feasible design possibility.
24
Klep, James Stuart. "Investigation of outburst characteristics in dwarf novae binary star systems." CardinalScholar 1.0, 2009. http://liblink.bsu.edu/uhtbin/catkey/1540704.
Full textAbstract:
Dwarf novae are a type of binary star system that consists of a cool red dwarf, as well as a white dwarf with an accretion disk. Occasionally the disk will get significantly brighter for a few days in an event called an outburst. On February 6th, 2002 one such system, CN Orionis, was experiencing such an outburst. The goal of this research was to determine some important characteristics of CN Orionis during its outburst. This thesis will present the light output, temperature, and the area of the accretion disk of CN Orionis.Department of Physics and Astronomy
25
Garcia, Justine. "Évaluations numériques de nouveaux implants de hanche avec matériau novateur (métal poreux)." Mémoire, École de technologie supérieure, 2014. http://espace.etsmtl.ca/1277/1/GARCIA_Justine.pdf.
Full textAbstract:
Chez les patients atteints de pathologies articulaires de la hanche, le remplacement du cartilage dégénéré de la tête fémorale et de l’acétabulum peut s’effectuer par une prothèse totale. Conventionnellement constitué de matériaux plus rigides que le tissu osseux, l’implant engendre des modifications de sollicitations dans l’os fémoral, entraînant sa résorption (stress shielding (SS)). Un changement des caractéristiques mécaniques de la prothèse, à travers un nouveau métal, serait une solution pour pallier le problème.
L’objectif principal du mémoire est l’étude, à travers des analyses par éléments finis, de prothèses de hanches fabriquées avec un matériau novateur par electron beam melting: le titane poreux. Deux cas sont analysés. Le premier est un implant à revêtement en titane poreux. Les analyses qui lui sont associées servent à sa certification pour commercialisation, et à la compréhension du comportement de ce nouveau matériau. Le second porte sur un implant entièrement en titane poreux, de façon à trouver les rigidités de la tige permettant une meilleure répartition des contraintes dans l’os pour minimiser le risque de SS.
Les résultats de la prothèse avec revêtement poreux valident le design de l’implant, et montrent une amélioration de la répartition des contraintes, pouvant ainsi diminuer le SS. Ceux de la prothèse entièrement en titane poreux prouvent que la tige fémorale peut être raccourcie et qu’une subdivision en trois, selon les zones de contacts prothèse-os cortical, permettrait d’agir sur les contraintes dans l’os trabéculaire.
26
Gomes, Frederico Cesar de Vasconcelos. "Análise das práticas decisórias de novatos e experts no processo de inovação." Universidade Federal de Minas Gerais, 2013. http://hdl.handle.net/1843/BUOS-9BHJTP.
Full textAbstract:
Innovation is able to change the rules of competition in a given sector, threatening the position of established firms and even create new markets. Despite the interest of academia, one of the main focuses of researches is based on the study of innovation in the perspective of the organization. Therefore, we sought to investigate the decision taken by individuals within the innovation process. It was found that these individuals possess different skill levels that can go from beginners to experts. The focus of this study was to understand how these individuals, beginners and experts, utilize models of innovation management to make their decision. We adopted this understanding to the triad: academia, incubators and market analysis for the skills of the practitioner of innovation and mapping the characteristics and skills of an expert and a novice in this process. It has thus become possible, through the reports obtained, analyze the similarities and distinctions between the practices adopted by individuals and organizations studied and the models established by the academy. To achieve this goal, Strategy Practice was methodologically employed. Through this methodology established itself the object of analysis: individuals with different levels of experience related to the innovation process. We conducted a series of interviews with experts and beginners who somehow were linked to the innovation process. From the analysis of these reports was possible to obtain a description of the possible trajectories of an individual within the process of innovation and its competence according to the degree of innovation. These same reports emerged that there are different types of experts about the degree of innovation, and we observed a specific set of skills. This distinction can be explained in the analysis of how each individual in a degree of innovation, adopts and applies the models of innovation management in its decision making process. It is hoped that this study assists in understanding how models of innovation management are adopted and used by individuals in their decision making processes and the types of existing experts in this processA inovação é capaz de mudar as regras de competição em um dado setor, ameaçar a posição de firmas estabelecidas e até mesmo criar novos mercados. Apesar do interesse da academia, grande parte das pesquisas ainda tem como foco o estudo da inovação na perspectiva da organização. Sendo assim, buscou-se investigar a tomada de decisão dos indivíduos dentro dos processos de inovação. Identificou-se que estes indivíduos possuem diferentes níveis de habilidades podendo ir de novatos a experts. O foco deste trabalho foi entender como esses indivíduos, novatos e experts, utilizam os modelos de gestão da inovação em suas tomadas de decisão. Adotou-se para essa compreensão a tríade: academia, incubadoras e mercado, para a análise das competências do praticante da inovação e o mapeamento das características e habilidades de um expert e de um novato nesse processo. Tornou-se assim possível, por meio dos relatos obtidos, analisar as semelhanças e as distinções entre as práticas adotadas pelos indivíduos das organizações estudadas e os modelos consagrados pela academia. Para alcançar esse objetivo traçado, metodologicamente foi empregada a Estratégia como Prática. Por meio dessa metodologia estabeleceu-se o objeto de análise: indivíduos com diferentes níveis de experiência ligados ao processo de inovação. Foi realizada uma série de entrevistas com profissionais novatos e experts que de alguma forma estavam ligados ao processo de inovação. A partir da análise desses relatos obteve-se a descrição das possíveis trajetórias de um individuo dentro do processo de inovação e de suas competências de acordo com o grau das inovações. Emergiu desses mesmos relatos a existência de diferentes tipos de experts quanto ao grau de inovação, sendo observado um conjunto específico de competências. Essa distinção pode ser explicitada na análise da forma como cada indivíduo, em um grau de inovação, adota e aplica os modelos de gestão da inovação no seu processo decisório. Espera-se que esse estudo auxilie na compreensão de como os modelos de gestão da inovação são usados e adotados pelos indivíduos em seus processos decisórios e os tipos de experts existentes nesse processo
27
Harlaftis, Emilios Theofanus. "Disc structure and variability in dwarf novae." Thesis, University of Oxford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302822.
Full text
28
Ribeiro, Valerio A. R. M. "Investigation of the nebular reminants of novae." Thesis, Liverpool John Moores University, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.531366.
Full text
29
Black, Diego T. R. "Investigations of extragalactic and pre-telescopic novae." Thesis, Liverpool John Moores University, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.497004.
Full textAbstract:
There are many questions about the properties of Classical Novae (CNe) that remain unanswered including their use as distance indicators and the possible relationship between the nova rate in a host galaxy and its Hubble type. To answer these and other questions the Liverpool Telescope Extragalactic Nova Survey, LENS, the largest dedicated CNe search, was undertaken to observe M81, M64 and NGC2403. LENS made of difference imaging techniques to increase the sensitivity of the survey and to allow variables to be sampled in areas of high surface brightness, which would not have been possible to observe using standard photometric techniques. Unidentified problems with the technique resulted in difference image lightcurves that were of insufficient quality to identify CNe within the dataset. Unsuccessful remedial action was undertaken to improve the quality of the difference image lightcurves.
30
Osman, Suleiman M. "Modelling infrared emission and polarization of novae." Thesis, Keele University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.283975.
Full text
31
Healy, Fiona. "Radio observations and modelling of classical novae." Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/radio-observations-and-modelling-of-classical-novae(b9a47b31-07e5-4e7c-9b2b-55b8693271a7).html.
Full textAbstract:
A nova is a cataclysmic variable star consisting of a white dwarf and a main sequence, subgiant or red giant companion. In a nova explosion, the white dwarf undergoes a thermonuclear runaway on its surface, as a result of build-up of accreted material from its companion. This leads to a large expulsion of matter from the WD surface, as well as a dramatic increase in the optical magnitude of the system. In this thesis, 5GHz C-band e-MERLIN observations of two novae (V959 Mon and V339 Del) and one symbiotic star (AG Pegasi) are presented. V959 Mon is a classical nova which was discovered in June 2012 by the Fermi Large Area Telescope as a gamma-ray source. High resolution e-MERLIN images of V959 Mon were made at six epochs following the June 2012 outburst, between 90 and 615 days after the Fermi discovery. The first four e-MERLIN observations revealed a morphology which was aspherical and expanding in the east-west direction. However, in the last two epochs, V959 Mon's ejecta morphology changed from being elongated east-west to being elongated north-south. Constant velocity models fit to measurements of V959 Mon's angular size at each epoch indicated that the expansion rate of the north-south component was significantly slower than that of the east-west component. The e-MERLIN observations of V339 Del and AG Pegasi were not as well resolved as the observations of V959 Mon, and only limited analysis of their ejecta structure was possible. In order to understand the complicated morphology seen in the e-MERLIN observations of V959 Mon, radio emission models of nova ejecta were constructed, and e-MERLIN observations of them were simulated. When constructing the models, two possible explanations for V959 Mon's morphology were explored. Firstly, the possibility was considered that the elongation observed in V959 Mon's ejecta, which changed over time from east- west to north-south, was spurious, resulting from incomplete sampling of the uv plane by e-MERLIN. To investigate this, an expanding spherical shell of ejecta was simulated, the extent to which its shape was distorted in simulated e-MERLIN images of it was investigated. Secondly, emission from an ejecta model featuring two components - one fast-moving component in the east-west direction, and another, more slow-moving component in the north-south direction - was simulated, in order to determine whether such an ejecta structure could result in the morphology seen in the e-MERLIN observations of V959 Mon. It was found that the spherical, Hubble flow model simulations were a reasonably good fit to V959 Mon's light curve, but could not explain the east-west elongation seen in V959 Mon's ejecta at the early epochs. Simulated observations of the two-component model were morphologically similar to V959 Mon, but produced light curves which were much fainter than V959 Mon's, indicating that a more in-depth analysis of two-component models of nova ejecta is necessary.
32
Scepi, Nicolas. "Accrétion dans les disques de novae naines." Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAY020/document.
Full textAbstract:
Les novæ naines permettent, depuis presque 50 ans maintenant, de tester les modèles d’accrétion. Ces systèmes montrent des éruptions en optique d’une durée de l’ordre de la semaine avec des temps de récurrence de l’ordre du mois. Ces éruptions sont communément attribuées à une instabilité thermo-visqueuse au sein du disque d’accrétion entourant la naine blanche. Les temps caractéristiques de ces éruptions posent de fortes contraintes sur les mécanismes de transport de moment cinétique pilotant l’accrétion dans le disque, mécanismes qui constituent l’objet de cette thèse. Il est souvent admis que l’instabilité magnéto-rotationnelle (MRI) est responsable du transport de moment cinétique via la turbulence qu’elle produit. Cependant, je montre ici, à l’aide de simulations locales de disque d’accrétion avec transfert radiatif, que le transport turbulent produit par la MRI ne permet pas de reproduire les courbes de lumière. En quiescence, où le disque est peu ionisé, il est même peu probable que de la turbulence MRI puisse survivre. Un des résultats majeurs de cette thèse est d’avoir mis en lumière que la MRI ne participe pas qu’au transport turbulent mais peut également lancer des vents magnéto-hydrodynamiques (MHD) qui transportent également du moment cinétique, voire dominent le transport dans l’état quiescent. Ces vents MHD induisent un couple magnétique de surface sur le disque et ne peuvent être réduits à une turbulence effective, en partie car ceux-ci ne déposent pas d’énergie thermique localement mais en emportent contrairement au transport turbulent. Nous avons inclus le transport de moment cinétique dû au couple du vent MHD dans un modèle d’instabilité de disque, modèle classiquement utilisé pour reproduire les éruptions de novæ naines. Avec ce nouveau modèle, nous avons montré qu’il est possible de reproduire les courbes de lumière des éruptions de novæ naines, en utilisant un champ magnétique à la surface de la naine blanche compatible avec ce qui est attendu. C’est la première fois que les éruptions de novæ naines sont modélisées avec succès en utilisant des prescriptions pour le transport de moment cinétique basées sur des simulations MHD et non sur les observationsDwarf novæ have been used for almost 50 years now as a test for the theory of accretion. These systems exhibit eruptions in optical light lasting approximately a week with a recurrence time scale of a month. Eruptions are thought to be due to a thermal-viscous instability in the accretion disk surrounding the white dwarf. This model has long been known to put constraints on the mechanisms transporting angular momentum in the disk, which will be the subject of this thesis. Traditionally, transport is presumed to be turbulent where turbulence is due to the magneto-rotational instability (MRI). However, I show here, using local simulations of accretion disks with radiative transfer that there exists a discrepancy between observations and light curves obtained with MRI turbulence only. In quiescence, where the disk is poorly ionised, it is very unlikely that MRI can even survive. One of the key results of this thesis is that MRI do not participate to turbulent angular momentum transport only, but is also able to drive MHD outflows which extract angular momentum very efficiently, especially in quiescence. Wind-driven transport is, by nature, very different from turbulent transport, it induces a surface-torque on the disk and do not deposit thermal energy locally but extract energy from the disk instead. We included MHD wind-driven angular momentum transport in a disk instability model, model which is usually used to reproduce light curves of dwarf novæ. Using this new model, we were able to retrieve light curves looking alike observations, with a magnetic field consistent with what is expected from the dipolar magnetic field of a white dwarf. It is the first time that eruptions of dwarf novæ are modeled with success using prescriptions for angular momentum transport derived from first principles instead of ad hoc parameters
33
Scott, Andrew D. "Multiwavelength studies of classical and recurrent novae." Thesis, Keele University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259579.
Full text
34
Jecu, Cristian. "Système de protections novateur et distribué pour les réseaux Moyenne Tension du futur." Phd thesis, Université de Grenoble, 2011. http://tel.archives-ouvertes.fr/tel-00862516.
Full textAbstract:
Ce travail est lié au système de protection des réseaux de distribution. Les réseaux radiaux dedistribution peuvent être protégés simplement par une protection placée en tête du départ. Maisl'exploitation future des réseaux de distribution, qui se transforment en réseaux intelligents,flexibles et adaptatifs, va sûrement nécessiter une protégeabilité plus complexe. Parconséquent, un nouveau plan de protection pourrait être nécessaire afin d'augmenter la fiabilitédu réseau de distribution et le taux de productions décentralisées. Il pourrait inclure plusieursprotections déployées sur un départ. Le but principal de ce travail est d'étudier comment lesprotections pourraient agir (sur quel genre de grandeurs les protections reposeront, quellecoordination faut-il choisir) et d'analyser les limites de ces nouvelles protections. En déployantplusieurs protections qui divisent le départ en des zones plus petites, le plan de protectionproposé, reposant sur une formulation modifié et optimisée, proche de celle des protections dedistance classiques, déconnectera ainsi moins de consommateurs et de producteurs lors del'apparition de défauts. Cela devrait réduire le temps de coupures brèves et de diminuerl'énergie non fournie. Ce manuscrit présente une solution pour les réseaux HTA radiaux faceaux défauts monophasés.
35
Buat-Ménard, Valentin. "Novae naines : Le modèle d'instabilité du disque d'accrétion." Université Louis Pasteur (Strasbourg) (1971-2008), 2001. http://www.theses.fr/2001STR13214.
Full text
36
Casanova, Bustamante Jordi. "Multi-dimensional simulations of mixing in classical novae." Doctoral thesis, Universitat Politècnica de Catalunya, 2011. http://hdl.handle.net/10803/52806.
Full textAbstract:
Classical nova explosions are stellar explosions that take place in close binary systems with an energy release only exceeded by gamma-ray bursts and supernova explosions. Matter from the white dwarf flows through the inner lagrangian point and spirals in towards the white dwarf for about 10^4-10^5 years, forming an accretion disk around it. Ultimately, part of this hydrogen-rich matter piles-up on top of the compact object and becomes partially degenerate due to the high densities attained. Consequently, temperature is allowed to rise, but the envelope does not experience any expansion. Actually, this is the key mechanism that controls the subsequent phases and powers a thermonuclear runaway, which is followed by an ejection of part of the accreted envelope. The ejecta are enriched with the products from the nuclear processes, presenting a final metallicity much above solar. This model, introduced in the early 70s, is a solid theory that can account for the gross scenario of nova explosions. Nevertheless, the theory relies on the fact that a mixing episode with matter from the white dwarf core has to take place at the core-envelope interface to successfully account for the high metallicities inferred from observations. During the past 40 years, theoreticians have performed many one-dimensional simulations, which can reproduce the abundances in the ejecta and other important observational properties. However, these calculations performed in spherical symmetry cannot study the mixing process, since they exclude a suite of very important multi-dimensional effects, such as convection. Therefore, multi-dimensional calculations are required to shed light into the mixing episode. In this thesis we have performed two- and three- dimensional simulations of CO novae to study the mixing mechanisms operating at the core-envelope interface, how convection sets in and how the deflagration spreads over the domain, by means of the Eulerian, parallelized, hydrodynamical FLASH code. The two-dimensional results show how convection sets in at the innermost envelope layers, after the appearance of temperature fluctuations that arise from the interface. Convection, in turn, powers the formation of kelvin-Helmholtz instabilities, which efficiently dredge-up 12C from the core and carry it into the envelope, reproducing correctly the high metallicity found in the ejecta. This result solves the controversy generated by the two existing two-dimensional calculations up-to-date. We have also realized a sensitivity study to analyze the impact of some initial parameters, such as the temperature perturbation, resolution of the simulations and the size of the computational domain. The results point out that these parameters have a negligible impact on the degree of mixing and, therefore, the calculations are not affected by numerical artifacts. Although two-dimensional calculations can quantitatively reproduce the mixing episode, they cannot describe correctly the convective pattern due to conservation of vorticity, which translates into recombination of the convective cells. Therefore, we have extended the work to three dimensions and performed the first three-dimesional model of mixing in classical novae up-to-date. These calculations can successfully reproduce the intermittency present in turbulent convection, with an energy cascade into smaller scales which clearly fulfills the Kolmogorov theory, while the thermonuclear runaway continues propagating with almost spherical symmetry. Mixing proceeds through the filamentary structure powered by robust kelvin-Helmholtz instabilitites that arise from the interface, resulting in a CNO enhancement which agrees with observations. This convective profile also generates density contrasts that could be the origin of the inhomogeneous distribution of chemical species.Les explosions de noves tenen lloc en un sistema estel.lar binari, on un dels estels ha arribat a la fi de la seva vida convertit en una nana blanca. En sistemes binaris molt propers, l'estel acompanyant cedeix part del seu gas (material ric en hidrogen), el qual s'arremolina al voltant de la nana blanca durant prop de 10^4 - 10^5 anys. Una fracció d'aquest material acaba apilant-se a la superfície de l'objecte compacte i esdevé parcialment degenerat com a conseqüència de l'elevada densitat. Aquest fet és clau en el procés, ja que permet que la temperatura augmenti sense que es produeixi una expansió de l'embolcall, desencadenant un allau termonuclear i finalment, l'ejecció de matèria. El material ejectat està enriquit amb els isòtops processats en les reaccions nuclears, presentant una metal.licitat molt superior a la solar. Aquest model, presentat a principis dels anys 70, és una teoria sòlida que explica raonablement l'explosió de noves. No obstant, la teoria rau en el fet que s'ha de produir un procés de barreja entre el material de la nana blanca i el material de les capes més internes de l'embolcall per poder explicar l'alta metal.licitat que s'observa en el material ejectat. Durant els últims 40 anys, s'han fet molts estudis en una dimensió que aconsegueixen reproduir correctament les abundàncies del material ejectat i altres importants propietats observacionals, però que no poden explicar com es produeix el procés de barreja, ja que aquests càlculs amb simetria esfèrica exlouen tota una sèrie d'importants fenòmens multidimensionals. Per tant, per estudiar aquests aspectes de la teoria es requereixen estudis multidimensionals. En aquesta tesi hem realitzat simulacions en dues i tres dimensions de noves de CO per estudiar els mecanismes de barreja que es produeixen a la interfície del nucli de la nana blanca i l'embolcall, com s'estableix la convecció i com es propaga el front deflagratiu, mitjançant el codi hidrodinàmic FLASH, que és Eulerià i està paral.lelitzat. Els resultats en dues dimensions mostren com es genera convecció a les capes més internes de l'embolcall, després de la formació de fluctuacions de temperatura a la interfície. La convecció, al seu torn, origina inestabilitats Kelvin-Helmholtz que transporten eficientment 12C del nucli cap a l'embolcall, aconseguint reproduir correctament el grau de metal.licitat observat. Aquest resultat resol la controvèrsia generada pels dos estudis en dues dimensions realitzats fins ara. També hem realitzat un estudi per analitzar l'impacte dels paràmetres inicials tals com la perturbació inicial, la resolució de les simulacions o les dimensions del domini computacional. Els resultats indiquen que cap d'aquests paràmetres influeix en el grau de barreja final i, per tant, que els càlculs no estan condicionats per aspectes numèrics. Finalment, hem presentat el primer model tridimensional de barreja de noves fet fins ara. Aquest càlcul és necessari, ja que les simulacions bidimensionals, tot i que quantitativament reprodueixen la barreja esperada, no poden representar el patró convectiu correctament, degut a la conservació de la vorticitat, fent que les cel.les convectives esdevinguin cada cop més grans. El nostre càlcul aconsegueix reproduir el comportament intermitent de la turbulència, amb una cascada d'energia que flueix cap a escales cada cop més petites, tal i com prediu la teoria de Kolmogorov, alhora que el front convectiu avança pràcticament amb simetria esfèrica. La barreja procedeix a través de l'estructura filamentosa originada per l'aparició de potents inestabilitats Kelvin-Helmholtz a la interfície, obtenint-se una metal.licitat final a l'embolcall que concorda amb els valors observacionals. Aquest patró convectiu també genera contrastos de densitat que podrien ser l'origen de la distribució inhomogènia que presenten les espècies químiques.
37
Woerd, Hendrik Jan van der. "A multiwavelength study of superoutbursts in dwarf novae." [S.l. : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 1987. http://dare.uva.nl/document/91205.
Full text
38
Wilson, Fergus James. "Accretion processes in symbiotic stars and recurrent novae." Thesis, University of Leicester, 2011. http://hdl.handle.net/2381/9057.
Full textAbstract:
This thesis sets out to further develop our understanding of accretion processes in symbiotic stars, in particular the accretion disc formation radius and mass capture fraction from a stellar wind. I then explore how these potentially large discs can deliver mass onto the white dwarf at the nuclear burning rate, allowing the white dwarf to grow in mass rather than going through nova explosions. Finally, if this is not possible, I investigate how nova explosions interact with the disc the white dwarf star may harbour. Using smoothed particle hydrodynamics, I present circularisation radii and mass capture rates for 8 different symbiotic binary star systems undergoing mass transfer from a stellar wind. I explore the wind velocity and secondary star rotation parameter space. I compare these radii against one another and the expected circularisation radii for Roche lobe overflow. Using RS Oph as an example, I determine that it is unlikely for the disc to be maintained in the hot and steady state. Furthermore, unless the mass loss from the red giant is unusually large, the wind velocity must be very slow to enable the required mass transfer from the red giant to the disc to explain RS Oph’s ~ 20 year outburst cycle. I present an analytical method to describe the outburst and recurrence time of 18 cataclysmic variable stars (including 4 Z Cam, 9 U Gem and 5 SW Uma). Using the Markov chain Monte Carlo method, the parameter space is constrained. Extrapolating the analytical method to long period cataclysmic variables, the periods during which average mass transfer through the disc lies within the nuclear burning regime, and the irradiation from this promoting more of the disc into the hot, more viscous state to drive prolonged outbursts, was found. This could enable a 1Mסּ white dwarf to grow to the Chandrasekhar mass in a minimum time of approximately 1 million years. Finally, a new test (the Richtmyer-Meshkov instability) on Godunov smoothed particle hydrodynamics was performed and compared against standard smoothed particle hydrodynamics. Using the same code, nova blast waves into discs of constant and varying density are simulated and compared against the Sedov solution and the Kompaneet approximation respectively. Using simple energy arguments, I calculate how much of the nova and disc material remains bound to the WD. In the less energetic novae, approximately 40% of the disc and more than 80% of the nova material remains bound to the white dwarf, whilst in high energy novae approximately none of the disc and less than 50% of the nova material remains bound to the white dwarf.
39
Weight, Anthony. "Investigations of novae at infrared and millimetre wavelengths." Thesis, Keele University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.359283.
Full text
40
Imada, Akira. "CCD photometry of SU UMa-type dwarf novae." 京都大学 (Kyoto University), 2008. http://hdl.handle.net/2433/136883.
Full text
41
Ishioka, Ryoko. "Optical observations of dwarf novae and related objects." 京都大学 (Kyoto University), 2005. http://hdl.handle.net/2433/145084.
Full textAbstract:
Kyoto University (京都大学)0048
新制・課程博士
博士(理学)
甲第11316号
理博第2874号
新制||理||1429(附属図書館)
22959
UT51-2005-D67
京都大学大学院理学研究科物理学･宇宙物理学専攻
(主査)助教授 平田 龍幸, 教授 長田 哲也, 教授 舞原 俊憲
学位規則第4条第1項該当
42
Benson-Avillan, Elixia. "Spectroscopic analysis of the dwarf nova SS Cygni." CardinalScholar 1.0, 2010. http://liblink.bsu.edu/uhtbin/catkey/1562867.
Full textAbstract:
Dwarf novae are a type of cataclysmic variable in which one of the components is
a white dwarf. Their outbursts can range in brightness from two to five magnitudes at
intervals that can vary from days to decades. The purpose of this study is to analyze the
outburst of SS Cygni on the nights of June 18-22, 1987. Using an Interactive Reduction
Software (IRS) package and a Gaussian fit program, the emission and absorption line
strengths on the rise to outburst showed an increase in the flux as well as various other
details supported by theory.Dwarf novae -- Accretion disk -- SS Cygni -- Data analysis and results.
Department of Physics and Astronomy
43
Callus, C. M. "Infrared studies of classical novae and the recurrent nova RS Ophiuchi." Thesis, Keele University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379423.
Full text
44
Andrade, Sérgio Luiz Ferreira. "Coordenaçao do chute do futebol sob condiçoes de fadiga em sujeitos novatos e experientes." reponame:Repositório Institucional da UFPR, 2004. http://hdl.handle.net/1884/335.
Full textAbstract:
Orientador : André Luiz Felix RodackiDissertaçao (mestrado) - Universidade Federal do Paraná, Setor de Ciencias Biológicas, Programa de Pós-Graduaçao em Educaçao Física. Defesa: Curitiba, 2004
Inclui bibliografia e anexo
Área de concentraçao: Exercício e Esporte
45
Mohamed, Ali Mortada. "Les ḥiğāziyyāt de Šarīf al-Raḍī : étude d’un genre poétique novateur au Xe siècle." Thesis, Sorbonne Paris Cité, 2017. http://www.theses.fr/2017USPCA115.
Full textAbstract:
Šarīf al-Raḍī, auteur incontournable pour qui souhaite étudier la poésie arabe à travers son histoire, peut difficilement être catalogué. En effet, bien qu’il ait profité des courant littéraire qui l’ont précédé, ce poète précoce, critique littéraire, juriste, linguiste et émir du hadj a petit à petit développé son propre genre poétique à travers les ḥiğāziyyāt, composant ainsi des poésies d’amour autour des lieux saints du pèlerinage. Cette étude visera donc dans un premier temps à comprendre ce qui fait l’originalité de ce genre en son temps pour enfin tenter de saisir la portée de l’influence des ḥiğāziyyāt sur la poésie arabe des siècles qui ont succédé à notre poèteŠarīf al-Raḍī, major writer whose work has to be studied by anyone interested in Arabic poetry throughout time, can hardly be classified. While he took advantage from past literary movements, this poet, who started writing at an early age and became a literary critic as well as a linguist, a jurist and the emir of hajj, gradually developed a new poetical genre through his ḥiğāziyyāt. He thus composed love poems that revolve around the sacred places of pilgrimage. This study aims at understanding what made this genre unique in its time before trying to grasp the scope of the ḥiğāziyyāt’s influence on Arabic poetry in the following centuries
46
Ami, Ali L. "LE CINEMA DE BANLIEUE : UN REGARD NOVATEUR ET AVENTUREUX SUR UN TERRITOIRE DIFFICILEMENT IDENTIFIABLE." Miami University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=miami1563948399363779.
Full text
47
Dubská, Petra. "Materská škola Ružomberok." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2018. http://www.nusl.cz/ntk/nusl-371863.
Full textAbstract:
The topic of my diploma project is a design and a project documentation of a kindergarten in the city of Ružomberok. The building is located on a flat land with a rectangular shape in a peaceful locality. The floor plan of the building is atypical.The building consists of a ground floor with a partial basement. The structural wooden system uses massive wooden wall panels by Novatop. The basement is made of a concrete structural system. The structure is based on the concrete strip foundations and it has a flat roof. The kindergarten is divided into the class sections and a utility part with a kitchen. Overall, there are three classes with the maximum capacity of 60 children. Two class sections are of the same hight and the one in the middle is raised. All the day rooms are south-facing and each of them has a direct access to the wooden terrace. On the east side of the site there is a parking lot designed for 16 cars with a path leading to the main gate and to the building entrances. The entrances to the kindergarten and to the utility part are separated. The main entrance to the kindergarten is designed as barrier-free.
48
Lotay, Gavin James. "Gamma-ray spectroscopy measurements for nuclear reactions in novae." Thesis, University of Edinburgh, 2009. http://hdl.handle.net/1842/3893.
Full textAbstract:
The 23Mg(pγ)24Al and 26Al(pγ)27Si astrophysical reactions are expected to be of considerable importance in the nucleosynthesis of A≥20 nuclei in classical novae. Previous studies have indicated that both reactions are dominated by resonant capture to excited states, above the proton-emission thresholds, in the proton-rich nuclei 24Al and 27Si, respectively. Consequently, by determining the nuclear properties of such resonant states it is possible to estimate the 23Mg(pγ)24Al and 26Al(pγ)27Si stellar reaction rates. In this thesis work, excited states in 24Al and 27Si were populated via the 10B(16O, 2n) and 12C(16O, n) heavy-ion fusion-evaporation reactions, respectively. The beams of 16O ions were produced by the Argonne Tandem Linear Accelerator System and prompt electromagnetic radiation was detected using the GAMMASPHERE detector array, which, in the case of the 24Al experiment, was used in coincidence with recoil selection provided by the Argonne Fragment Mass Analyzer. The two γray spectroscopy studies performed in this work allowed level structure determinations below the respective proton-emission thresholds of 24Al and 27Si nuclei, with improved precision on previous work. In addition to this, these studies also allowed a determination of the nuclear properties of proton-unbound astrophysically important γ decaying states, which, in turn, were used to re-evaluate the 23Mg(pγ)24Al and 26Al(pγ)27Si stellar reaction rates. The improved precision of the level energies and unambiguous assignments of resonant states has reduced the relative uncertainties in both the 23Mg(pγ)24Al and 26Al(pγ)27Si stellar reaction rates, constraining the production of A≥20 nuclei in classical novae.
49
Slavin, Andrew John. "A study of the nebular remnants of classical novae." Thesis, Liverpool John Moores University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319832.
Full text
50
Novak, Cameron J. "The effects of using musical songs as a supplement to a traditional life science curriculum." Montana State University, 2011. http://etd.lib.montana.edu/etd/2011/novak/NovakC0811.pdf.
Full textAbstract:
Throughout the course of an academic school year, some students in my seventh grade science classroom struggle with recalling taught material. My project, which is based on the action research model, focused on using music as a supplement to traditional teaching techniques as a means of facilitating higher achievement scores, greater self-efficacy among students, and an overall increase in student success. The results of utilizing music to increase assessment scores, as well as student attendance and student attitude, were considered during my research. Forms of data collection for the project included student interviews, student questionnaires, teacher journal, field notes, attendance rates, and assessment scores. These data collection tools were used to measure the effect of music on student assessment scores. The students were receptive to the project and the treatment group was excited when music was infused with their typical classroom instruction. The results of the study indicated that students exposed to the music did in fact earn higher scores on assessments over the treatment time period. In addition, the attendance rate was higher in the classes being exposed to the treatment. In the future, I plan to incorporate music in each section of Life Science that I teach.