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1
Hultman, Viktoria, e Daniela Schagerlind. "Butikslojalitet möter reciprocitet : Hur lättpåverkad är konsumenten?" Thesis, Högskolan i Skövde, Institutionen för handel och företagande, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-15816.
Testo completoAbstract (sommario):
Butikslojalitet är viktigt för butiken då lojala kunder kan gynna dem utifrån marknadsföring och lönsamhetsperspektiv. Säljteknik, i vårt fall reciprocitet, är också viktig för butiken då det är ett sätt att påverka konsumenten i deras köpprocess genom att utföra tjänster eller ge gåvor till konsumenten för att skapa en känsla av att stå i skuld. Syftet med rapporten är att undersöka hur reciprocitet kan användas för att påverka konsumenten till att skifta lojalitet till en annan butik eller förstärka lojaliteten till butiken. För att uppfylla syftet har vi svarat på vår frågeställning. Frågeställningen är hur säljtekniken reciprocitet påverkar konsumenters butikslojalitet när det kommer till köp av kläder. Vi använde oss av en kvalitativ metod, där undersökningen var i intervjuform med sex olika representanter i åldersgruppen 20-30 år. Intervjun utformades i syftet att få reda på hur respondenternas butikslojalitet påverkades av reciprocitet och om lojaliteten kunde förstärkas av reciprocitet. Av vår empiri och teori kunde vi komma fram till slutsatsen att reciprocitet påverkar kunders lojalitet och framförallt principerna om perceptuell kontrast och backa efter avslag.Store loyalty is important for the stores as they can benefit from the loyal customers when it comes to marketing and profitability. Sales techniques are also important to the store as they are a way of influencing consumers in their buying process by providing services or giving the consumer gifts to create a feeling of guilt. The purpose of the report is to investigate how reciprocity can affect the consumer to switch their loyalty to a different store or enhance the loyalty to the store. To fulfill this purpose, we have answered our question. The question is how the sales technique reciprocity affect the consumers store loyalty when it comes to buying clothes. A qualitative method was used, where the survey consisted in interviews with six different representatives in the age group 20-30 years. The interview was designed to find out how respondents store loyalty was affected by reciprocity and if loyalty could be enhanced by reciprocity. From our empirical and theory, we could conclude that reciprocity affects customer loyalty and especially the principles of perceptual contrast and door in the face.
2
Melvin, Thomas. "The role of bars in disk galaxy evolution". Thesis, University of Portsmouth, 2016. https://researchportal.port.ac.uk/portal/en/theses/the-role-of-bars-in-disk-galaxy-evolution(27858416-958e-47d8-9c81-ec193062aaf7).html.
Testo completoAbstract (sommario):
Galactic bars play in an important role in the evolution of disk galaxies. Bars also act as a tracer for dynamically cool, `mature' disk galaxies. Therefore, the observational study of bars, especially at higher redshifts, provides an invaluable insight into how the disk galaxy population has evolved as the Universe has aged. In this thesis, I present research that explores the redshift evolution of the bar fraction since z = 1, and the first look at the fraction of disk galaxies hosting bars out to z = 2. My research combines optical and infrared observations, taken by the Advanced Camera for Surveys and Wide Field Camera 3 instruments on board the Hubble Space Telescope, with visual morphological classifications made by citizen scientists as part of the Galaxy Zoo project. After a careful analysis of the visual morphologies provided and the possible effects of a range of potential observational biases, I measure the redshift evolution of the bar fraction in the COSMOS field. For a volume limited sample (0.4 ≤ z ≤ 1.0; log(M★/M⊙) ≥10) of 2,380 disk galaxies, of which 317 are barred (fbar ∼13%), I find that the bar fraction has increased from 11±2% at z = 1, to 22±5% at z = 0.4. Furthermore, when splitting this sample into three stellar mass bins, I find that, whilst an increasing bar fraction with decreasing redshift is observed for all stellar masses, it is the most massive disk galaxies that drive the evolution observed. Building on this work, I present the first observations of the bar fractions beyond z = 1. Using visual morphological classifications from Galaxy Zoo: CANDELS, a sample of 876 disk galaxies, with 123 being barred disks (fbar ∼ 14%) are identified across the redshift range 0.5 ≤ z ≤ 2.0. Selecting a sub-sample within the same region of the evolving galaxy luminosity function (brighter than L), we find that the bar fraction across the redshift range 0.5 ≤ z ≤ 2 (fbar = 10.7+6:3-3:5% after correcting for incompleteness) does not significantly evolve. I present a recipe that describes how to explore the effects observational biases have on visual morphological classifications, before working through this recipe in detail in order to debias the galaxies in the Galaxy Zoo: Hubble catalogue. Of the 46,703 galaxies found within the redshift range 0.3 ≤ z ≤ 1.0, 24% (15,855) can be debiased, with a further 33% (15,338) having lower and upper limits placed on their original pfeatures vote-fractions. I use the newly debiased classifications to re-explore the redshift evolving bar fraction, finding that the trend is greater within these galaxies, increasing from fbar = 4±1% at z = 1, to fbar = 24±2% at z = 0.3. In my exploration of barred disk galaxies in the COSMOS field, up to z = 1, I identified a sample of 98 quiescent disk galaxies whose bar fraction is considerably higher (fbar ∼ 45±5%) than the overall disk sample. To investigate this observation further, I explore the evolving demographics of the red sequence since z = 1. Using rest-frame colours from the UltraVISTA catalogue (McCracken et al., 2012), I find that, when using debiased pfeatures classifications, the fraction of all disk galaxies that are part of the red sequence decreases from 26±2% at z = 1, to 11±2% at z ∼0. Additionally, I also find that the fraction of all barred disk galaxies that are part of the red sequence increases from 0% at z = 1, to 22±4% at z ∼ 0. I conclude that these results show a maturing disk galaxy population as the universe ages.
3
Aronica, Giuseppe Agostino. "The vertical structure of thickened bars in disk galaxies". [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=980574919.
Testo completo
4
Williams, Michael J. "Early-type disk galaxies". Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:936168ab-f49a-410a-9e1b-80c7ad7cf556.
Testo completoAbstract (sommario):
In this thesis I investigate the dynamics and stellar populations of a sample of 28 edge-on early-type (S0--Sb) disk galaxies, 22 of which host a boxy or peanut-shaped bulge. I begin by constructing mass models of the galaxies based on their observed photometry and stellar kinematics. Subject to cosmologically motivated assumptions about the shape of dark haloes, I measure in a purely dynamical way their stellar and dark masses. I make a preliminary comparison between the dynamically determined stellar masses and those predicted by stellar population models. I then compare the Tully-Fisher (luminosity--velocity) relations of the spirals and S0s in the sample. I show that S0s are systematically fainter at a given rotational velocity, but the amount by which they are fainter is less than expected by models in which they are the products of truncation of star formation in spirals. This raises the possibility that S0s are smaller or more concentrated than spirals of the same mass. I then study the vertical structure of the boxy and peanut-shaped bulges of a subset of the sample. Among this sample of five galaxies, I find one example in which the stellar populations show no evidence that the bulge and the disk formed in different processes, and in which the bulge is in perfectly cylindrical rotation, i.e. its line-of-sight velocity does not change with height above the disk. This galaxy is probably a pure disk galaxy. However, even with this small sample, I also show that cylindrical rotation and homogeneous stellar populations are not ubiquitous properties of boxy and peanut-shaped bulges. Finally I analyse central and radial trends in the stellar populations of the bulges of full sample of 28 galaxies. I find that, at a given velocity dispersion, the central stellar populations of these barred early-type disk galaxies are identical to those of elliptical galaxies, which suggests that secular evolution does not dominate the centre of these galaxies. However, the radial metallicity gradients are shallower than those of ellipticals. This is qualitatively consistent with chemodynamical models of bar formation, in which radial inflow and outflow smears out pre-existing gradients.
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Tseng, Chaw-Wu. "Vibration of rotating-shaft design spindles with flexible bases /". Thesis, Connect to this title online; UW restricted, 2002. http://hdl.handle.net/1773/7129.
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Pohle, Dirk [Verfasser]. "Komposite auf der Basis von Polyetheretherketon für den Knochenersatz / Dirk Pohle". Aachen : Shaker, 2009. http://d-nb.info/1156517818/34.
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Unocic, Raymond Robert. "On the Creep Deformation Mechanisms of an Advanced Disk Ni-base Superalloy". The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1218556287.
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Ahmed, Nazeer [Verfasser], e Dirk [Akademischer Betreuer] Becker. "Physiological and molecular basis of Azospirillum-Arabidopsis Interaction / Ahmed Nazeer. Betreuer: Dirk Becker". Würzburg : Universitätsbibliothek der Universität Würzburg, 2012. http://d-nb.info/1022522701/34.
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Silva, Carlos Eduardo da. "Uso de fluoresce?na s?dica em meningeomas da base do cr?nio". Pontif?cia Universidade Cat?lica do Rio Grande do Sul, 2013. http://tede2.pucrs.br/tede2/handle/tede/1746.
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Previous issue date: 2013-06-26Objective: The authors present a study with the use of sodium fluorescein (SF) to enhance skull base meningiomas and perform a quantitative digital analysis of the tumors enhancement. The study intends to observe the grade of cranial base meningiomas enhancement by SF. Methods: A prospective within-subjects study was performed including twelve patients with skull base meningiomas. Digital pictures were obtained before and after the SF systemic injection, using the same light-source of the microsurgical field. The pictures were analyzed by Image Pro Plus 4.5.1 software, which calculated the wavelength of the sodium fluorescein pre and post injection. Results: The group of meningiomas was composed as it follows: one cavernous sinus, one olfactory groove, three petroclival, one tuberculum sellae, three sphnoid wing, one anterior clinoid and two temporal floor. The SF enhancement in all tumors was strongly positive. The digital analysis of the pictures, considering the SF wavelength pre and post injection, presented p=0.002 (Wilcoxon T test). Conclusions: The enhancement of the skull base meningiomas by SF was consistent. The introductory results suggest the possibility of using SF as an adjuvant tool for the skull base meningioma surgery. Further studies should test the clinical application of the SF in skull base tumors.
Objetivo: Apresenta-se o primeiro estudo com o uso de Fluoresce?na S?dica (FS) para contrastar meningeomas localizados na base do cr?nio e realiza-se uma an?lise quantitativa digital do contraste tumoral. O estudo tem por objetivo observar o grau de capta??o de FS pelos meningeomas da base do cr?nio. M?todos: Estudo descritivo com observa??o intragrupo (antes e depois), incluindo 12 pacientes com les?es da base do cr?nio. Fotografias digitais foram realizadas antes e ap?s a administra??o sist?mica de FS, utilizando-se a mesma fonte de ilumina??o do campo microcir?rgico. As fotografias pr? e p?s-inje??o de FS foram analisadas usando-se o software Image Pro Plus 4.5.1, que calculou o comprimento de onda da FS nas respectivas imagens. Resultados: O grupo de meningeomas foi distribu?do topograficamente da seguinte forma: um do seio cavernoso, um da goteira olfat?ria, tr?s petroclivais, um do tub?rculo selar, tr?s da asa do esfen?ide,um da clin?ide anterior e dois do assoalho temporal. O contraste dos tumores pela FS foi fortemente positivo. A an?lise digital das fotografias, considerando a presen?a do comprimento de onda da FS nas imagens obtidas pr? e p?s-inje??o de FS, apresentou uma diferen?a significativa, com p=0,002 (Teste T de Wilcoxon). Conclus?es: A capta??o da FS pelos meningeomas foi consistente. Os resultados introdut?rios sugerem a possibilidade de uso da FS como uma ferramenta adjuvante para a cirurgia dos meningeomas de base de cr?nio. Estudos complementares s?o necess?rios para definir aplica??o cl?nica da FS em tumores da base do cr?nio.
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Hambach, Manuel [Verfasser], e Dirk [Akademischer Betreuer] Volkmer. "Hochfeste multifunktionale Verbundwerkstoffe auf Basis von Portlandzement und Kohlenstoffkurzfasern / Manuel Hambach ; Betreuer: Dirk Volkmer". Augsburg : Universität Augsburg, 2017. http://d-nb.info/1139641174/34.
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Schneider, Sven [Verfasser], Dirk [Akademischer Betreuer] [Gutachter] Donath e Christoph [Gutachter] Hölscher. "Sichtbarkeitsbasierte Raumerzeugung - Automatisierte Erzeugung räumlicher Konfigurationen in Architektur und Städtebau auf Basis sichtbarkeitsbasierter Raumrepräsentationen / Sven Schneider ; Gutachter: Dirk Donath, Christoph Hölscher ; Betreuer: Dirk Donath". Weimar : Professur Informatik in der Architektur, 2016. http://d-nb.info/1116713497/34.
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Lönnström, Ken, Julia Jansson-Lindberg e Tobias Uhrus. "Lojalitet - myt eller verklighet? : En kvantitativ studie om lojalitet på apoteksmarknaden". Thesis, Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-24769.
Testo completoAbstract (sommario):
Syftet med uppsatsen är att undersöka hur lojala konsumenterna på apoteksmarknaden i Katrineholm är. Eventuella samband mellan kön och lojalitetstyp samt åldersgrupp och lojalitetstyp undersöktes även. För att uppnå syftet genomfördes en kvantitativ undersökning med hjälp av enkäter, där 240 svar samlades in. Konsumenterna delades in i de fyra lojalitetstyper som tas upp i Dick och Basus lojalitetsmodell. Analysen visar att kön inte spelar in i vilken lojalitetstyp individen tillhör. Åldersgruppstillhörighet har dock en signifikant påverkan.
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Verlaine, Lionel. "Optimisation des requêtes dans une machine bases de données". Paris 6, 1986. http://www.theses.fr/1986PA066532.
Testo completoAbstract (sommario):
CCette thèse propose des solutions optimisant l'évaluation de questions et la jointure. Ces propositions sont étudiées et mises en œuvre à partir du SGBD Sabrina issu du projet SABRE sur matériel Carrousel à la SAGEM. L'évaluation de questions permet d'optimiser le niveau logique du traitement d'une requête. La décomposition la plus pertinente est établie en fonction d'heuristiques simples. L'algorithme de jointure propose utilise des mécanismes minimisant à la fois le nombre d'entrées/sorties disque et le nombre de comparaisons. Il admet un temps d'exécution proportionnel au nombre de tuples. L'ordonnancement de jointures est résolu par un algorithme original de jointure multi-relations et par une méthode d'ordonnancement associée permettant un haut degré de parallélisme.
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Jansson, Patrik. ""La leyenda tiene una base real" : Análisis crítico del discurso de un artículo de El País". Thesis, Högskolan Dalarna, Spanska, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:du-12648.
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This paper carries out a critical discourse analysis (CDA) of the article "¿Chinofobia?” published by the Spanish newspaper El País. It applies the theory of racist discourse in the media as formulated by Teun A. van Dijk. Its hypothesis is that the article, which supposedly analyses discrimination against the Chinese minority in Spain, covertly blames the Chinese minority itself for the discrimination. Applying CDA methodology as exemplified in previous studies by van Dijk, the paper analyses the article on global and local levels, and delineates its mental model. The global level analysis describes the article in terms of macropropositions and proposes a macrostructure: the self-alienation of the Chinese minority. The paper then analyses how the macrostructure is reinforced on the local level through micropropositions by examining 1) how vocabulary serves the negative presentation and othering of the Chinese minority, 2) how strategies of mitigation minimise discrimination by employing imprecise and vague language, 3) how quotes are used to give coherence and force to the macrostructure, 4) how implications associate the Chinese minority with criminality, and 5) how stereotyped beliefs about the Chinese minority are presented as common sense (presuppositions) and fallaciously argued. Finally, the paper delineates the mental model: the presuppositions about integration, and the implicit warning that minorities should integrate or they will be discriminated against.
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Küng, Florian [Verfasser], Dirk W. [Akademischer Betreuer] Schubert, Dirk W. [Gutachter] Schubert e Thomas A. [Gutachter] Fuchsluger. "Entwicklung einer vernähbaren Wundabdeckung für die Cornea auf Basis ausgerichteter polymerer Nanofasern / Florian Küng ; Gutachter: Dirk W. Schubert, Thomas A. Fuchsluger ; Betreuer: Dirk W. Schubert". Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2018. http://d-nb.info/1169913237/34.
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Dall, Angol Lucas. "Adesivo à base de poliuretano para reparação pós-cirúrgica do disco intervertebral". reponame:Repositório Institucional da UCS, 2018. https://repositorio.ucs.br/11338/3845.
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Walter, Dirk Christoph [Verfasser], Markus [Akademischer Betreuer] Gerhard e Dirk [Akademischer Betreuer] Busch. "Entwicklung und klinische Erprobung eines serologischen Tests für Helicobacter pylori auf Basis rekombinant hergestellter Antigene / Dirk Christoph Walter. Gutachter: Markus Gerhard ; Dirk Busch. Betreuer: Markus Gerhard". München : Universitätsbibliothek der TU München, 2013. http://d-nb.info/103852718X/34.
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Geist, Matthias [Verfasser], e Dirk [Gutachter] Kurth. "Koordinationspolymere auf der Basis von Terpyridin und Dipyridyltriazin: Synthese und Anwendung / Matthias Geist. Gutachter: Dirk Kurth". Würzburg : Universität Würzburg, 2015. http://d-nb.info/1108781926/34.
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Lenzen, Dirk [Verfasser]. "Erzeugung von Kälte mittels Wärme: Entwicklung neuer Adsorbentien und Anwendungsbeispiele auf Basis von 3D-Koordinationspolymeren / Dirk Lenzen". Kiel : Universitätsbibliothek Kiel, 2019. http://d-nb.info/1193491495/34.
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Volta, Dirk [Verfasser]. "Das physikalische Optimum als Basis von Systematiken zur Steigerung der Energie- und Stoffeffizienz von Produktionsprozessen / Dirk Volta". Clausthal-Zellerfeld : Universitätsbibliothek Clausthal, 2014. http://d-nb.info/1063916224/34.
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Nolteernsting, Felix Verfasser], Dirk [Akademischer Betreuer] [Abel e Robert [Akademischer Betreuer] Pitz-Paal. "Betriebsassistenz für solarthermische Kraftwerke zur Effizienzsteigerung auf Basis regelungstechnischer Methoden / Felix Nolteernsting ; Dirk Abel, Robert Pitz-Paal". Aachen : Universitätsbibliothek der RWTH Aachen, 2020. http://d-nb.info/1230985433/34.
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BARROS, Matheus Henrique da Fonsêca. "Saberes docentes e Tecnologias Digitais de Informação e Comunicação (TDIC) no curso de licenciatura em música da UFPE". Universidade Federal de Pernambuco, 2016. https://repositorio.ufpe.br/handle/123456789/19466.
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Submitted by Fabio Sobreira Campos da Costa (fabio.sobreira@ufpe.br) on 2017-07-10T15:20:47Z
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DissertaçãoMatheusBarrosVersaoFinal.pdf: 1464519 bytes, checksum: dee0cc69d64e43016acfa081b97ed5b6 (MD5)Made available in DSpace on 2017-07-10T15:20:47Z (GMT). No. of bitstreams: 2 license_rdf: 811 bytes, checksum: e39d27027a6cc9cb039ad269a5db8e34 (MD5) DissertaçãoMatheusBarrosVersaoFinal.pdf: 1464519 bytes, checksum: dee0cc69d64e43016acfa081b97ed5b6 (MD5) Previous issue date: 2016-06-21
O presente trabalho teve como objetivo compreender como os saberes relacionados às tecnologias digitais de informação e comunicação (TDIC) são construídos pelos professores da licenciatura em música da UFPE. Os objetivos específicos foram identificar quais são os saberes mobilizados pelos professores do curso de Licenciatura em Música da UFPE quando utilizam as TDIC em sua prática pedagógica; identificar nos documentos norteadores da prática pedagógica (projeto pedagógico de curso; programas de disciplina) a presença das TDIC e analisar as concepções dos professores quanto à importância das TDIC na formação docente em Música. O percurso metodológico para atingir esses objetivos incluiu a definição do curso de Licenciatura em Música da UFPE como campo de pesquisa e o Estudo de Casos Múltiplos, com abordagem qualitativa, como estratégia de pesquisa utilizada. Os participantes da pesquisa foram 3 professores integrantes do corpo docente do referido curso, indicados pelos licenciandos como referência na utilização das TDIC em sua prática docente. Esses professores aceitaram participar voluntariamente da pesquisa, sendo denominados Professor A, Professor B e Professor C. Os dados foram coletados através de entrevistas semiestruturadas e análise documental dos programas de disciplina ministradas pelos Professores participantes da pesquisa e dos Projetos Pedagógicos do Curso (Perfil 8804-1 e Perfil 8805). O tratamento desses dados foi feito por meio da técnica de análise de conteúdo de Bardin (2011). Pudemos concluir que os saberes docentes relacionados às TDIC, no contexto da licenciatura em Música da UFPE, são construídos por professores Imigrantes Digitais, o que propicia uma visão e prática instrumentalista da tecnologia sem, no entanto, deixar de reconhecer a importância destas dentro do processo de formação inicial docente em música. Esta visão acaba por não permitir o entendimento da tecnologia como conhecimento específico da música. Os saberes construídos, em sua maioria, podem ser considerados experienciais e são resultado da formação inicial dos docentes, das demandas do corpo discente, que é constituído por nativos digitais, e da documentação que fundamenta suas práticas.
This study aims to understand how knowledge related to digital information and communication technologies (DICT) is constructed by professors of the Music Graduation Course in UFPE. The specific objectives were to identify what is the knowledge mobilized by such professors when using DICT in their practices; to identify the presence of DICT in the guiding documents of pedagogical practices (pedagogical project course; discipline programs), and to analyze the teachers’ conceptions of DICT’s importance to teacher training in music. The methodological approach in order to achieve those goals included the definition of the Bachelor's Degree in Music UFPE as a research field, and Multiple Case Study with a qualitative approach as the employed research strategy. The participants were three members of the faculty professors in that course nominated by undergraduates as a reference in the use of DICT in their teaching practice. These teachers agreed to take part in the study voluntarily, being named Professor A, Professor B and Professor C. Data were collected through semi- structured interviews and documentary analysis of discipline programs taught by professors participating in the research and Pedagogical Course Project (8804- Profile 1 and Profile 8805). The processing of the data was carried out according to Bardin’s content analysis technique (2011). We concluded that the faculty knowledge related to DICT, in the context of the Music Graduation Course at UFPE, is constructed by Digital-Immigrant-Professors, who provide an instrumentalist vision and practice of technology without, however, failing to recognize the importance of those in the process of initial teacher training in music. This view does not allow the understanding of technology as a specific knowledge of music. The knowledge built, in most cases, can be considered experiential and is the result of initial teacher training, the demands of the student body, which is made up by digital natives, and documentation that bases its practices.
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Heinrich, Dirk [Verfasser], e Reinhard [Akademischer Betreuer] Bredehorst. "Substitution humaner Seren auf Basis der IgY-Technologie für die immunologische in vitro-Diagnostik / Dirk Heinrich. Betreuer: Reinhard Bredehorst". Hamburg : Staats- und Universitätsbibliothek Hamburg, 2013. http://d-nb.info/1038789222/34.
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Schott, Marco [Verfasser], e Dirk G. [Gutachter] Kurth. "Neuartige Elektrodenmaterialien auf der Basis von Metallo-Polyelektrolyten und Hybridpolymeren für elektrochrome Fenster / Marco Schott. Gutachter: Dirk G. Kurth". Würzburg : Universität Würzburg, 2015. http://d-nb.info/1110985207/34.
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Chafer, Matthieu. "Sources lasers innovantes à base de micro-capsules photoniques et par nano-structuration de milieux gazeux". Thesis, Limoges, 2018. http://www.theses.fr/2018LIMO0042.
Testo completoAbstract (sommario):
Depuis leur avènement, les fibres à cristal photonique à cœur creux ont prouvé leur capacité à convertir des fréquences avec une haute efficacité, notamment en jouant sur le phénomène de diffusion Raman stimulée. Dans le cadre d’un contrat CIFRE entre la société GLOphotonics et l’institut de recherche Xlim, ce projet de thèse a consisté à développer ces fibres afin d’améliorer leurs performances optiques pour cibler deux voies d’applications: une industrielle pour proposer un laser compact multi-ligne dans le visible et dans l’UV et une seconde plus fondamentale pour réaliser un synthétiseur d’onde optique. L’amélioration de ces performances repose sur l’exacerbation de l’inhibition du couplage entre le mode du coeur d’air et les modes de silice de la gaine. Pour cela deux types de micro-structures ont été explorées à savoir une maille Kagomé et une maille tubulaire. Plusieurs fibres ont été alors fabriquées démontrant des performances records sur toute une gamme de longueurs d’onde (8,5 dB/km à 1 µm, 7,7 dB/km à 750 nm, 13,8 dB/ km à 549 nm, et autour de 70 dB/km à 355 nm). Concernant la fonctionnalisation de ces fibres, des micro-capsules photoniques ont été conçues et réalisées permettant à la fois de palier au problème de la perméabilité de la silice au gaz (stabilité de la conversion dépassant 12 mois) et de démontrer une conversion de 26 lignes dans le visible. Un produit industriel nommé CombLas a alors été produit puis appliqué à une étude de cytométrie en flux pour étudier l’influence du taux de répétition du laser de pompe. Ce produit a également été étendu à la gamme spectrale de l’UV avec la génération de 24 lignes entre 225-400 nm. Enfin, des travaux plus fondamentaux ont été réalisés consistant à développer un synthétiseur d’onde optique à base de génération Raman dans ces fibres creuses. Une nouvelle dynamique a été observée démontrant le piégeage de molécules d’hydrogène par un réseau optique auto-assemblé de puits de potentiel ultra-profonds et nanométriques. Cela permis de générer un régime Lamb-Dicke de la diffusion Raman stimulée. Des signatures sub-Doppler usuellement vues dans les atomes froids ont été mesurées avec des largeurs de bandes plus étroites de plus de 5 ordres de grandeurs par rapport à ce qui est prédit dans la littérature. Finalement, cette largeur de bande a été optimisée d’un ordre de grandeur en jouant sur la longueur de la fibre et la pression de l’hydrogèneSince their advent, hollow-core photonic crystal fibers have proved to be highly efficient for frequency conversion, especially via by playing with stimulated Raman scattering. Within the frame work of a CIFRE contract between the firm GLOphotonics and the Xlim research institute, this thesis project has consisted in developing these fibers to enhance their optical performances, in order to target two different field of applications: an industrial one to offer a a compact multi-line laser in the visible and UV and a second more fundamental one to realize a optical wave synthesizer. The amelioration of these performances relies on the exacerbation of the inhibition of the coupling between the air core mode and the silica cladding modes. Two types of micro-structures have been explored, a Kagomé and a tubular lattice. Several fibers have been fabricated demonstrating record performances on all a wavelength range (8.5 dB/km at 1 µm, 7.7 dB/km at 750 nm, 13.8 dB/km at 549 nm, and around 70 dB/km at 355 nm). Concerning the functionalization of the fibers, photonic micro-cells have been designed and realized enabling to overcome the problem the permeability of silica to gas (conversion stability over 12 months) and demonstrate a conversion to 26 lines in the visible. An industrial product coined CombLas has been made and used for flow cytometry in order to study the influence of the repetition rate of the pump laser. This product has also been extended to the UV range with 24 lines generated between 225-400 nm. Also, more fundamental research has been realized consisting in developing an optical wave synthesizer based on Raman generation in hollow core fibres where a new dynamic has been observed demonstrating the trapping of hydrogen molecules by an auto-assembled optical lattice of ultra-deep and nano-metric potential wells. This configuration has enabled to generate a Lamb-Dicke regime of stimulated Raman scattering. Sub-Doppler signatures usually found in cold atoms have been measured with linewidths narrower than 5 orders of magnitude than what is predicted in the literature. Finally, this linewidth has been optmised of an order of magnitude by plaing on the length of the fiber and the pressure of hydrogen
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Meyer, Christoph [Verfasser], Peter [Gutachter] Uwer, Dirk [Gutachter] Kreimer e Stefan [Gutachter] Weinzierl. "Algorithmic transformation of multi-loop Feynman integrals to a canonical basis / Christoph Meyer ; Gutachter: Peter Uwer, Dirk Kreimer, Stefan Weinzierl". Berlin : Humboldt-Universität zu Berlin, 2018. http://d-nb.info/1182540457/34.
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Fortune, Marc Harris Yao. "The curious case of offset bars : markers for a baby galaxy disk or signposts of an interaction with dark matter sub halos?" University of the Western Cape, 2016. http://hdl.handle.net/11394/5551.
Testo completoAbstract (sommario):
>Magister Scientiae - MScWe have used the Spitzer Survey of Stellar Structure in Galaxies (S⁴G) as a representative sample of the local universe (total of 2352 galaxies in S⁴G) to make a catalog of offset disk barred galaxies. Using the combined variation of the position angle and the ellipticity (provided by ellipse fit) and also through visual inspection, we have been able to identify all offset structures in S⁴G. While primary bars are present in 2=3 of the disk galaxies in the visible universe, offset bars have a much lower fraction. Of the ̴ 1500 (3.6µm images) disk galaxies available in S⁴G, we classified only 49 as offset barred disk galaxies. We have determined basic properties (bar to total luminosity ratio, bar length, disk scale-length and bars of offset bars shape) using GALFIT, a widely used galaxy decomposition software package. Our main conclusion is that all the offset bars are boxy, independent of their offset from the galaxy center, or the mass of the host galaxy. Additionally we find that, the early type offset bars seem to be more boxy than the late types. The comparison of our offset sample with two other samples, respectively, low mass and high mass normal barred galaxies ("normal" for bars located at the photometric center of the host galaxy), reveals them to be at an intermediate position between the two normal samples. The bar length, disk scale-length and bar to total luminosity ratio are on average larger than the low mass normal and smaller than high mass normal barred galaxies. We have found, overall, a tighter correlation between the disk and bar properties for offset bars in comparison to the two normal samples. Our explanation is that, although the offset has no visible impact on the global shape of the bars, the process responsible for these disturbances seems to affect the star formation rate such that their disk and bars are on average more active than the normal barred galaxies in the same mass range, but not enough to surpass normal barred galaxies with much higher mass.
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Maurer, Thomas [Verfasser], Friedrich [Akademischer Betreuer] Thießen, Friedrich [Gutachter] Thießen e Dirk [Gutachter] Linowski. "Erfolgsfaktoren von Genossenschaftsbanken : Eine Analyse auf Basis von Jahresabschlüssen und regionalen Wirtschaftsdaten / Thomas Maurer ; Gutachter: Friedrich Thießen, Dirk Linowski ; Betreuer: Friedrich Thießen". Chemnitz : Universitätsbibliothek Chemnitz, 2016. http://d-nb.info/1214305040/34.
Testo completo
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Dittmann, Dirk [Verfasser], Zeno [Verfasser] Rummler, Klaus [Verfasser] Schlote-Holubek e Werner K. [Verfasser] Schomburg. "Durchflusssensoren aus Kunststoff für sehr kleine Volumenströme auf der Basis des AMANDA-Verfahrens / Dirk Dittmann, Zeno Rummler, Klaus Schlote-Holubek, Werner K. Schomburg". Karlsruhe : KIT-Bibliothek, 2002. http://d-nb.info/1198221763/34.
Testo completo
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Siadjeu, Christian [Verfasser], Dirk C. [Akademischer Betreuer] Albach e Sascha [Akademischer Betreuer] Laubinger. "Molecular breeding bases of trifoliate yam (Dioscorea dumetorum (Kunth) Pax) post-harvest hardening phenomenon of tubers / Christian Siadjeu ; Dirk C. Albach, Sascha Laubinger". Oldenburg : BIS der Universität Oldenburg, 2021. http://d-nb.info/1231434236/34.
Testo completo
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Kordel, Tobias [Verfasser], Dirk [Gutachter] Holland-Moritz e Hartmut [Gutachter] Zabel. "Nahordnung und atomare Dynamik in elektrostatisch levitierten Zr-Basis-Schmelzen / Tobias Kordel ; Gutachter: Dirk Holland-Moritz, Hartmut Zabel ; Fakultät für Physik und Astronomie". Bochum : Ruhr-Universität Bochum, 2012. http://d-nb.info/1230628525/34.
Testo completo
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Bourdin, François. "Analyse des processus d’endommagement aux joints de grains dans les superalliages base Nickel Measurements of plastic localization by heaviside-digital image correlation". Thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2020. http://www.theses.fr/2020ESMA0013.
Testo completoAbstract (sommario):
Les superalliages base Nickel employés dans les disques de turbine sont soumis à des sollicitations sévères allant du fluage à la fatigue à des températures pouvant atteindre 700°C. Dans ces conditions, la littérature montre que les joints de grains sont l’élément structural le plus faible. En fonction de ces conditions, les joints de grains peuvent glisser, transmettre ou accumuler de la déformation et s’oxyder. Ainsi,l’endommagement intergranulaire est étroitement lié à ces processus de déformation.L’objectif de ces travaux est de contribuer à la compréhension des mécanismes de déformation et d’endommagement qui ont lieu aux joints de grains. Pour étudier de manière quantitative les premiers stades de plasticité et d’endommagements, une nouvelle approche de mesure sans contact prenant en comptes les discontinuités de déplacement est présentée : la Heaviside-DIC. Celle-ci a fait l’objet d’une validation avant d’être utilisée dans l’étude du glissement inter et intragranulaire à haute température. Une première étude qualitative a permis de mettre en évidence des endommagements intergranulaires plus importants en fluage à 700°C/700 MPa comparé à la traction à différentes températures. La mise en œuvre de la H-DIC à 2échelles couplée à l’EBSD, a permis d’identifier une configuration microstructurale néfaste dans les superalliages polycristallins pour disques de turbine : les joints de macles cohérents. La comparaison à un superalliage colonnaire pour aubes ne possédant aucun joint de macle confirme ces observations.A la lumière de ces résultats et en s’appuyant sur des travaux de la littérature, un scénario permettant d’expliquer la transition entre déformation et endommagement intergranulaire est proposéNickel-based superalloys used in turbine disks are subjected to severe stresses ranging from creep to fatigue at temperatures up to 700°C. Under these conditions, the literature shows that grain boundaries are the weakest structural element. Depending on these conditions, the grain boundaries can slide, transmit or accumulate deformation and are favorable locations for oxidation. Thus, intergranular damage is closely related to these deformation processes.The purpose of this work is to contribute to the understanding of the deformation and damage mechanisms that occur at grain boundaries. To study quantitatively the early stages of plasticity and damage, a new non-contact measurement approach taking into account displacement discontinuities is presented: Heaviside-DIC. It was validated before being used in the study of high temperature inter and intragranular sliding. Afirst qualitative study has shown greater intergranular damage in creep at 700°C / 700 MPa compared to tension at different temperatures. The implementation of H-DIC at 2 scales coupled with EBSD, allowed to identify a detrimental microstructural configuration in turbine disks polycrystalline superalloys: coherent twin boundaries. Comparison with a turbine blade columnar superalloy with no twins confirms these observations.In this light, and based on literature, a scenario explaining the transition between deformation and intergranular damage is proposed
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Ulrich, Christoph [Verfasser], Hans-Gerd [Gutachter] Maas, Lutz [Gutachter] Bannehr e Dirk [Gutachter] Jungmann. "Entwicklung und Validierung einer Methodik zur Überwachung von verockerten Fließgewässern auf Basis von Hyperspektraldaten / Christoph Ulrich ; Gutachter: Hans-Gerd Maas, Lutz Bannehr, Dirk Jungmann". Dresden : Technische Universität Dresden, 2020. http://d-nb.info/1227312326/34.
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Pham, Ngoc Thach. "Cémentation électrochimique assistée par les ultrasons basse fréquence : application au couple cadmium/zinc". Grenoble INPG, 1999. http://www.theses.fr/1999INPG0014.
Testo completoAbstract (sommario):
Ce travail est consacre a l'etude de l'effet des ultrasons basse frequence (20 khz) sur la reaction de cementation cd(ii)/zn sur edt (electrode a disque tournant) et sur poudre en reacteur agite. Dans les deux configurations, et que ce soit avec ou sans ultrason, la reaction est controlee par le transfert de matiere liquide-solide des especes cementantes, du moins jusqu'a un taux de conversion de 80%. Sur edt, la cinetique de la reaction peut etre decrite par deux etapes du premier ordre dont la deuxieme est plus rapide que la premiere. Cette acceleration est liee a une modification de l'hydrodynamique a la surface de l'electrode resultant de l'evolution du depot sur les plans quantitatif (masse) et qualitatif (morphologie). L'apparition de cette rugosite critique depend de nombreux parametres operatoires tels que la vitesse d'agitation, la temperature ou bien encore les concentrations initiales en especes metalliques. D'autre part, l'apport des ultrasons sur la cinetique de la reaction est reduit par rapport aux resultats escomptes (gain d'un facteur 5-10) a partir d'une etude electrochimique du systeme redox etudie. Deux effets issus de la cavitation acoustique se compensent : l'amelioration du transfert de matiere (effet positif) et la regeneration de la surface reactionnelle (effet negatif). En effet, ce dernier conduit a la destruction du depot metallique dont la presence est l'agent accelerateur de la cinetique de cementation sans ultrason. En reacteur agite mecaniquement, les particules de zinc subissent une fragmentation conduisant, de part l'augmentation de surface reactionnelle, qui en resulte, a une amelioration de la cinetique. L'utilisation des ultrasons est egalement, dans cette configuration, peu probante sur la cinetique, les particules conservant une taille importante par fusion du depot de cadmium a leur surface. Cependant, elle permet a la reaction d'etre totale ce qui n'est pas le cas sans ultrason du fait d'une limitation en fin de reaction par le transport des especes zn(ii) oxydees du zinc des sites anodiques vers la solution. Une modelisation simplifiee de la reaction sur poudre en reacteur agite a permis de confirmer cette limitation. L'apport des ultrasons basse frequence sur la cementation cd(ii)/zn est donc globalement relativement limite d'autant plus que les energies mises en jeu sont importantes.
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Machado, murtinheiras martins Andre. "Statistical analysis of large scale surveys for constraining the Galaxy evolution". Thesis, Besançon, 2014. http://www.theses.fr/2014BESA2026/document.
Testo completoAbstract (sommario):
La formation et l'évolution du disque épais de la Voie Lactée restent controversées. Nous avons utilisé un modèle de synthèse de la population de la Galaxie, le Modèle de la Galaxie de Besançon (Robin et al., 2003), qui peut être utilisé pour l'interprétation des données, étudier la structure galactique et tester différents scénarios de formation et évolution Galactique. Nous avons examiné ces questions en étudiant la forme et la distribution de métallicité du disque mince et du disque épais en utilisant l'approche de synthèse de la population. Nous avons imposé sur des simulations les erreurs d'observation et les biais afin de les rendre directement comparables aux observations. Nous avons corrigé les magnitudes et les couleurs des étoiles de la simulation, en utilisant un modèle d'extinction. Les modèles d'extinction disponibles ne reproduisent pas toujours la quantité exacte d'extinction le long de la ligne de visée. Un programme a été développé pour corriger la distribution de l'extinction en fonction de la distance le long de ces lignes. Les extinctions correctes ont ensuite été appliquées sur les simulations du modèle. Nous avons étudié la forme du disque mince en utilisant des données photométriques aux basses latitudes du sondage SDSS-SEGUE. Nous avons comparé qualitativement et quantitativement les observations et les simulations et nous avons essayé de contraindre la fonction de masse initiale. En utilisant la spectroscopie du relevé SEGUE, nous avons sélectionné les étoiles du turn-off de la séquence principale (MSTO) (Cheng et al 2012) et des géantes K pour étudier la distribution de métallicité du disque mince et du disque épais. Nous avons calculé une estimation de distance pour chaque étoile à partir de la relation entre les températures effectives et magnitudes absolues pour les catalogues observés et simulés. Ces deux catalogues ont les mêmes biais sur les distances, elles sont donc comparables. Nous avons développé un outil basé sur une méthode MCMC-ABC pour déterminer la distribution de la métallicité et étudier les corrélations entre les paramètres ajustés. Nous avons confirmé la présence d'un gradient de métallicité radiale de -0.079 ± 0.015 dex kpc−1 pour le disque mince. Nous avons obtenu une métallicité du disque épais au voisinage solaire de -0.47 ± 0.03 dex, compatible avec les résultats obtenus par les études précédentes. De plus, le disque épais ne montre pas de gradient, mais les données sont compatibles avec un gradient positif intérieur suivi d'un négatif extérieur. Nous avons ensuite appliqué les outils développés au relevé spectroscopique Gaia-ESO et calculé la distribution de métallicité des étoiles F/G/K dans le disque mince et épais en supposant une formation en deux époques du disque épais de la Voie Lactée. Nous avons obtenu une métallicité locale dans le disque épais de -0.23 ± 0.04 dex légèrement plus élevée que celle obtenue avec SEGUE mais en accord avec Adibekyan et al. (2013) et un gradient de métallicité radiale du disque épais en accord avec notre analyse précédente des données de SEGUE et la littérature. La métallicité locale est en accord avec la littérature au niveau de 3σ mais parce que les données GES sont préliminaires, une analyse plus approfondie avec plus de données et de meilleurs calibrations doit être faite. L'existence d'un gradient plat dans le disque épais peut être une conséquence d'une formation à partir d’un gaz turbulent et bien homogène, ou bien un fort mélange radial a brassé après coup les étoilesThe formation and evolution of the thick disc of the Milky Way remain controversial. We made use of a population synthesis model of the Galaxy, the Besançon Galaxy Model (Robin et al. 2003), which can be used for data interpretation, study the Galactic structure and test different scenarios of Galaxy formation and evolution. We examined these questions by studying the shape and the metallicity distribution of the thin and thick disc using the population synthesis approach. We imposed on simulations observational errors and biases to make them directly comparable to observations. We corrected magnitudes and colors of stars, from the simulation, using an extinction model. The available extinction models do not always reproduce the exact quantity of extinction along the line of sight. A code to correct the distribution of extinction in distance along these lines have been developed and the corrected extinctions have been applied on model simulations. We studied the shape of the thin disc using photometric data at low latitudes from the SDSS-SEGUE survey. We compared qualitatively and quantitatively observations and simulations and try to constrain the Initial Mass Function. Using the spectroscopic survey SEGUE we selected Main Sequence Turnoff (MSTO) stars (Cheng et al 2012) and K giants to study the metallicity distribution of the thin and thick discs. We computed a distance for each star from the relation between effective temperatures and absolute magnitudes for the observed and simulated catalogs. These two catalogues have the same biases in distances, therefore are comparable. We developed a tool based on a MCMC-ABC method to determine the metallicity distribution and study the correlations between the fitted parameters. We confirmed a radial metallicity gradient of -0.079 ± 0.015 dex kpc−1 for the thin disc. We obtained a solar neighborhood metallicity of the thick disc of -0.47 ± 0.03 dex similar to previous studies and the thick disc shows no gradient but the data are compatible with an inner positive gradient followed by a outer negative one. Furthermore, we have applied the developed tools to the Gaia-ESO spectroscopic survey and computed the metallicity distribution of F/G/K stars in the thin and thick disc assuming a two epoch formation for the thick disc of the Milky Way. We obtained a local metallicity in the thick disc of -0.23 ± 0.04 dex slightly higher than the one obtained with SEGUE but in agreement with Adibekyan et al. (2013) and a radial metallicity gradient for the thick disc in agreement with our previous analysis of SEGUE data and the literature. The local metallicity is in fair agreement with literature at the 3σ level but because the GES data is an internal release under testing further analysis with more data and better calibrations have to be done. The existence of a flat gradient in the thick disc can be a consequence of an early formation from a highly turbulent homogeneous well mixed gas, unless it has suffered heavy radial mixing later on
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MENDON?A, Paloma Martins. "Estudo comparativo de imaturos de d?pteros muscoides de import?ncia m?dica-veterin?ria e forense com base em caracteres morfol?gicos e moleculares". Universidade Federal Rural do Rio de Janeiro, 2014. https://tede.ufrrj.br/jspui/handle/jspui/2272.
Testo completoAbstract (sommario):
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CNPq
The Order Diptera is composed by about 153 thousand described species, but it is believed that the number of unknown species is much bigger. Adults and immature of some muscoid dipteran groups have little morphological differences, making the identification process more difficult. Besides, the available dichotomous keys are based on adults, but in the case of myiasis and cadaver colonization, only immature are found. These insects are known pathogen vectors, their larvae parasite humans and animais and they play an important role in forensic entomology. Therefore, the correct identification of these species is very important. This study aims to characterize features of medical, veterinary and forensic important dipteran species using two new approaches. The first chapter uses scanning electron microscopy which gives detailed information on the morphological characters that can help identify the immature forms of the flies. Immatures belonging to three muscoids with forensic and sanitary importance were studied using this methodology: Peckia (Eubaettcheria) cal/usar (Diptera: Sarcophagidae) (larvae and puparia), Luc?lia cuprina (larvae and puparia) e Cachliamyia macellaria (eggs, larvae and puparia) (Diptera: Calliphoridae). The size ofthe chorionic cells as well as the absence of spines at the posterior spiracle allowed to differentiate C. mace/faria from C. haminivarax, both myiasis causing species. The maxillary palp complex composed by a group of papillae inside a cavity seem to be specific to the subgenus Eubaeucheria. The anterior spiracular openings displaced in an irregular row are found exclusively in Sarcophagidae. The filiform spines at the anal segments are found only in the genus Lucilia. In the second chapter, barcading is used to provide a gene sequence database of medical, veterinary and forensically important Calliphoridae flies. This technique is based on the sequencing of a portion of the genome of the mitochondrial cytochrome oxidase l (cal) gene. Nine species of flies were collected in four regions in Brazil, corresponding to 346 specimens. Two other gene fragments ( elongation factor 1 alpha and white) were sequenced for the first time for some species. The barcade proposal was successfully achieved for Hemilucilia segmentaria, Hemi/ucilia semidiaphana, Chlarapracla idiaidea, Cachliamyia macellaria, Chrysamya megacephala and Chrysamya albiceps, for which the intraspecific variation was less than 3%. However, for Lucilia eximia, Chrysamya putaria and Chrysamya rufifacies, this methodology brought incipient results. Intraspecific variation among Lucilia eximia samples was 4.6%, suggesting that the threshold proposed should not be used for ali dipteran species without previous analysis of the studied group. Chrysamya putaria is polyphyletic according to nuclear and mitochondrial genes. In addition, a set of samples grouped with samples of C. albiceps and C. rufifacies. Therefore, more studies need to be clone to better explain these taxonomic problems.
A ordem Diptera ? composta por aproximadamente 153 mil esp?cies descritas, mas acredita-se que o n?mero de esp?cies ainda desconhecidas ? muito grande. Alguns grupos de d?pteros musc?ides possuem imaturos e adultos com poucas varia??es morfol?gicas, dificultando muito o processo de identifica??o. Al?m disso, as chaves dicot?micas existentes s?o baseadas nos adultos, entretanto, s?o os imaturos mais encontrados causando mi?ases ou colonizando cad?veres. Estes inselos s?o conhecidos vetores de pat?genos, suas larvas s?o parasitas de humanos e animais e apresentam papel importante como auxilio a entomologia forense. Assim, a correta identifica??o das esp?cies que desempenham estas fun??es ? muito importante. O presente estudo tem como objetivo principal caracterizar esp?cies de d?ptcros mnscoidcs de import?ncia m?dica-veterin?ria e forense, atrav?s da utiliza??o de duas t?cnicas modernas de identifica??o. O primeiro cap?tulo utiliza a microscopia eletr?nica de varredura que permite a visualiza??o e a determina??o de caracteres que possam ser utilizados na identifica??o das esp?cies. Foram estudados imaturos de tr?s esp?cies de d?pteros de duas fam?lias diferentes: Peckia (Eubaettcheria) callusar (Diptera: Sarcophagidae) (larvas e pup?rios), Lucilia cuprina (larvas e pup?rios) e Cachliamyia macellaria (ovos, larvas e pup?rios) (Diptera: Calliphoridae) atrav?s desta t?cnica. O tamanho das c?lulas do exoc?rion permitiu diferenciar entre C. macellaria e C. haminivarax, duas esp?cies causadoras de mi?ases. A aus?ncia de espinhos no espir?culo posterior das larvas de C. macellaria tamb?m a diferencia de C. haminivarax. As papilas do complexo do palpo maxilar em uma cavidade parecem ser espec?ficas do subg?nero Eubaettcheria. As aberturas respirat?rias do espir?culo anterior dispostas em fileiras irregulares s?o exclusivas da fam?lia Sarcophagidae. A presen?a de espinhos filamentosos no ?ltimo segmento larval ? caracter?stica espec?fica do g?nero Lucilia. No segundo cap?tulo, a t?cnica de harcade ? utilizada para a forma??o de um banco de dados contendo sequ?ncias g?nicas de esp?cies de import?ncia m?dica-veterin?ria e forense da fam?lia Calliphoridae. Esta t?cnica baseia-se no sequenciamento de uma por??o do gene mitocondrial citocromo oxidase I (cal). Foram analisadas nove esp?cies de d?pteros, coletadas em quatro regi?es do Brasil, em um total de 346 esp?cimes utilizados. Dois segmentos do genoma nuclear (fator de elonga??o 1 alfa e white) tamb?m foram sequenciados pela primeira vez para algumas esp?cies. A proposta de barcade foi bem sucedida em Hemilucilia segmentaria, Hemilucilia semidiaphana, Chlaraprocta idiaidea, Cachliamyia macellaria, Chrysamya megacephala e Chrysamya albiceps, onde a varia??o intraespec?fica foi menor do que 3%. Entretanto, em Lucilia eximia, Chrysamya putaria e Ch1ysamya rufifacies esta metodologia trouxe resultados incipientes. A varia??o intraespec?fica em Lucilia eximia foi 4,6%, sugerindo que o limiar proposto n?o deve ser aplicado em todos os d?pteros sem an?lise pr?via do grupo estudado. Chrysamya pularia ? uma esp?cie polifi!?tica comprovada tanto pelos genes nucleares quanto mitocondrial, al?m isso, uma parte das amostras forma um agrupamento com as amostras de C. albiceps e C. nijifacies. Assim, acrcditase que mais estudos precisam ser conduzidos com o objetivo de esclarecer melhor estas quest?es taxon?micas.
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Silva, Carlos Eduardo da. "Uso de fluoresce?na s?dica em tumores da base de cr?nio : um estudo experimental introdut?rio com an?lise quantitativa digital de contraste tumoral". Pontif?cia Universidade Cat?lica do Rio Grande do Sul, 2011. http://tede2.pucrs.br/tede2/handle/tede/1606.
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Previous issue date: 2011-01-03Objetivo: Os autores apresentam o primeiro estudo com o uso de Fluoresce?na S?dica (FS) para contrastar tumores da base do cr?nio e realizam uma an?lise quantitativa digital do contraste tumoral. O estudo tem por objetivo observar o grau de contraste tumoral pela FS. M?todos: Foi realizado um estudo experimental prospectivo com controle intragrupo, incluindo seis pacientes com les?es da base do cr?nio. Fotografias digitais foram realizadas antes e ap?s a administra??o sist?mica de FS, utilizando a mesma fonte de ilumina??o do campo microcir?rgico. As fotografias pr? e p?s inje??o de FS foram analisadas por um software, o qual calculou o comprimento de onda da FS nas respectivas imagens. Resultados: O grupo de tumores foi constitu?do por: 1 schwanoma vestibular, 3 meningeomas, 1 craniofaringeoma e 1 adenoma de hip?fise. O contraste dos tumores pela FS foi fortemente positivo. A an?lise digital das fotografias, considerando os comprimentos de onda pr? e p?s inje??o de FS, apresentou p=0,028 (Teste T de Wilcoxon). Conclus?es: O contraste dos tumores pela FS foi consistente. Os resultados introdut?rios sugerem a possibilidade de uso da FS como uma ferramenta adjuvante para a cirurgia da base de cr?nio. Estudos complementares s?o necess?rios para definir aplica??o cl?nica da FS em tumores da base do cr?nio.
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Pecher, Heike Susanne. "Entwicklung von Monolithen auf Basis polyfunktioneller Glycidylether für die Anwendung in der Affinitätschromatographie". Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2014. http://dx.doi.org/10.18452/16933.
Testo completoAbstract (sommario):
Monolithische Phasen werden seit ca. 20 Jahren entwickelt und sind in den letzten Jahren eine attraktive Alternative zu etablierten mit Partikeln gefüllten Säulen geworden. Sie werden in anorganische Phasen und organische Polymermonolithe unterteilt. Monolithe bestehen aus einem einzigen, durchgehenden Stück. Charakteristisch ist das sie durchziehende Porennetzwerk, durch das der Eluent mit geringerem hydraulischen Widerstand fließen kann und das somit schnellere Flussraten ermöglicht. Polymermonolithe werden vorwiegend für die Separation großer Biomoleküle aufgrund eines durch Konvektion beschleunigten Massentransfers eingesetzt. Zudem sind sie über einen breiten pH-Wert-Bereich stabil und können direkt (in situ) im gewünschten Format polymerisiert werden. In der vorliegenden Arbeit gelang die Herstellung neuartiger epoxidbasierter Phasen nach einem von Weller et al. entwickelten Konzept, die im Affinitätsexperiment angewendet wurden. Die Herstellung erfolgte durch Autopolymerisation polyfunktioneller Glycidylether. Für die Funktionalisierung wurden nicht polymerisierte Epoxide genutzt. Als Monomere dienten TEPIC, GE 100 sowie GE 500. Die Arbeiten konzentrierten sich vor allem auf die bei Raumtemperatur durchführbaren Synthesen mit dem höher funktionellen GE 500. Die Polymerisationsbedingungen wurden hinsichtlich Porogenmischung und -anteil optimiert. Eine mit 75 Vol.-% Porogen (Dioxan/ MTBE (2:3)) hergestellte und mit rProtein A funktionalisierte Kapillarsäule (66 %, 12 µm, 7m2/g) ergab im Affinitätsexperiment eine Kapazität von 0,44 mg/mL aus Kaninchenserum isolierbarem IgG. Durch Beimischung von 60 % BDE konnte der Epoxidgehalt vervierfacht und die Porengröße auf 400 nm bei 59 % Porosität reduziert werden. Die spezifische Oberfläche wurde verdreifacht und die Kapazität präparierter Disks auf 0,90 mg/mL etwa verdoppelt. Die in dieser Arbeit entwickelten Disks können zur Isolierung von IgG aus einer komplexen Probe, wie beispielsweise Blutserum, eingesetzt werden.Monolithic supports have been developed since 20 years and have become an attractive alternative to well-established columns packed with particles over the past years. They are classified into inorganic media and organic polymer monoliths. Monoliths consist of a single, continuous piece with an integrated characteristic porous network through which the eluent can flow with lower hydraulic resistance and which consequently offers higher flow rates. Due to an accelerated mass transfer caused by convection polymer monoliths are mainly used for separation of large biomolecules. In addition, they are stable over a wide pH range and can be polymerized directly (in situ) in the desired format. In the present work the successful preparation of new epoxide-based supports according to a concept introduced by Weller et al. as well as their application in affinity chromatography are reported. Their preparation was carried out by self-polymerization of polyfunctional glycidyl ethers and for functionalization non-polymerized epoxide groups were used. As monomers TEPIC, GE 100 and GE 500 were utilized. The work has focused especially on the polymerization of the higher functional GE 500, which can be perfomed at room temperature and was optimized in terms of both composition and amount of porogen. The extraction of IgG from rabbit serum with a capillary column (66 %, 12 µm, 7m2/g) prepared by 75 vol.-% porogen (dioxane/ MTBE (2:3)) and functionalized with rprotein A resulted in a capacity of 0,44 mg/mL. By addition of 60 % BDE the epoxide content was quadrupled and the pore size reduced to 400 nm while maintaining consistently high porosity of 59 %. The specific surface area was tripled and the capacity of prepared disks approximately doubled to 0,90 mg/mL. The disks developed in this work can be applied for the isolation of IgG from complex samples such as serum.
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Lowke, Dirk [Verfasser], Peter [Akademischer Betreuer] Schießl, Harald [Akademischer Betreuer] Budelmann e Christoph [Akademischer Betreuer] Gehlen. "Sedimentationsverhalten und Robustheit Selbstverdichtender Betone : Optimierung auf Basis der Modellierung der interpartikulären Wechselwirkungen in zementbasierten Suspensionen / Dirk Lowke. Gutachter: Harald Budelmann ; Peter Schießl ; Christoph Gehlen. Betreuer: Peter Schießl". München : Universitätsbibliothek der TU München, 2013. http://d-nb.info/103649506X/34.
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ARAÚJO, Priscilla Bartolomeu de. "Efeito da substituição do feno de capim Tifton (Cynodon ssp) por casca de mamona (Ricinus communis) em dietas a base de palma forrageira (Nopalea cochenilifera Salm Dick) sobre o perfil de metabólitos energético-protéicos e mineral em ovinos". Universidade Federal Rural de Pernambuco, 2012. http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/5816.
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Submitted by (edna.saturno@ufrpe.br) on 2016-10-21T14:29:48Z
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Priscilla Bartolomeu de Araujo.pdf: 245978 bytes, checksum: 989ff44c01f905d2cfd90bb3afc92e32 (MD5)Made available in DSpace on 2016-10-21T14:29:48Z (GMT). No. of bitstreams: 1 Priscilla Bartolomeu de Araujo.pdf: 245978 bytes, checksum: 989ff44c01f905d2cfd90bb3afc92e32 (MD5) Previous issue date: 2012-02-01
Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPq
We evaluated the metabolic profile of sheep fed diets with different levels of peel castor bean (Ricinus communis) in diets based on cactus pear (Nopalea cochenilifera Salm Dick). We used 28 adult sheep, whole, without defined breed, with average weight of 18 kg. Blood samples were collected for determination of the following biological indicators: creatinine, urea, uric acid, total protein, albumin, globulin, aspartate aminotransferase, gamma glutamyl transferase, alkaline phosphatase, glucose, cholesterol, triglycerides, calcium and phosphorus. The variables are processed by customary biochemical methods in semi-automatic analyzer by flame photometry. The data were subjected to analysis of variance at 5% probability. Effects were observed for dietary variables: total protein, albumin, globulin, cholesterol, triglycerides, gamma glutamyl transferase and calcium. The replacement of tifton hay by the bark of castor linearly increased serum total protein, aspartate aminotransferase, gamma glutamyl transferase, cholesterol, triglycerides and calcium, as compared to serum globulin was negative linear profile while albumin had a quadratic profile. Regarding the time of collection of biological materials is not only significant changes were observed for the variables albumin and aspartate aminotransferase. There was no interaction between diet and collections in any of the variables. The replacement of tifton hay Castor caused by the shell, over time of receipt of the diets, increased linearly in serum urea, uric acid, total protein, globulin, gamma glutamyl transferase, plasma glucose, triglycerides, and P, while linear decrease was observed in serum creatinine and calcium. quadratic effect was observed in serum concentration of alkaline phosphatase and cholesterol, and, respectively, the maximum average 42 days of receipt of the diets. The castor bean hulls replacing the Tifton hay in diets based on cactus in sheep led to a metabolic response to energy deficit that can affect animal performance. It is also important to the use of different biological markers in the evaluation of sheep receiving diets with variation in the composition and can relate to other production parameters such as intake and nutrient absorption.
Avaliou-se perfil metabólico de ovinos recebendo dietas a base de palma forrageira (Nopalea cochenilifera Salm Dick) com diferentes níveis de casca de mamona (Ricinus communis) em substituição ao feno de tifton. Foram utilizados 28 carneiros adultos, inteiros, sem padrão racial definido, com peso vivo médio inicial de 18 kg. Amostras de sangue foram coletadas para determinação dos seguintes indicadores biológicos: creatinina, uréia, ácido úrico, proteína total, albumina, globulina, aspartato aminotransferase, gama glutamiltransferase, fostase alcalina, glicose, colesterol, triglicérides cálcio e fósforo. Para quantificação da concentração sanguínea dos metabólitos analisados foram utilizados métodos bioquímicos usuais em analisador semi-automático e fotometria de chama. Os dados foram submetidos à análise de variância ao nível de 5 % de probabilidade. A substituição do feno de capim tifton pela casca de mamona em diferentes proporções, aumentou linearmente a concentração sérica de proteína total, aspartatoaminotransferase, gamaglutamiltransferase, colesterol, triglicerídeos e cálcio, já em relação à globulina sérica o perfil foi linear negativo enquanto que a albumina teve perfil quadrático. Em relação aos momentos de coleta do material biológico só não foram observadas variações significativas para albumina e aspartatoaminotransferase. Não foi observada interação entre dietas e período experimental em nenhuma das variáveis analisadas. A substituição do feno de capim tifton pela casca de mamona provocou, ao longo do tempo de recebimento das dietas, aumento linear da concentração sérica de uréia, ácido úrico, proteína total, globulina, gamaglutamiltransferase, Glicose plasmática, triglicérides, e fósforo, enquanto que diminuição linear foi observada na concentração sérica de creatinina e cálcio. Efeito quadrático foi observado na concentração sérica de fosfatase alcalina e colesterol, tendo, respectivamente, média máxima aos 42 dias do recebimento das dietas. A inclusão de casca de mamona em substituição ao feno de tifton em dietas à base de palma forrageira para ovinos levou a uma resposta metabólica de déficit energético o que pode interferir no desempenho animal. Considera-se, também, a grande importância do uso de diferentes marcadores bioquímicos na avaliação de ovinos que recebem dietas com variação na composição e da possibilidade de correlação entre estes e outros parâmetros de produção, como consumo e absorção de nutrientes.
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Leonhart, Dirk [Verfasser], Günther [Gutachter] Meschke e Thomas-Peter [Gutachter] Fries. "Entwicklung numerischer Methoden zur Berechnung von multipler Rissausbreitung in teil- und vollgesättigten porösen Materialien auf Basis der Extended Finite Element Method / Dirk Leonhart ; Gutachter: Günther Meschke, Thomas-Peter Fries". Bochum : Ruhr-Universität Bochum, 2017. http://d-nb.info/1129452050/34.
Testo completo
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Hinkle, Kurt Berlin. "An Automated Method for Optimizing Compressor Blade Tuning". BYU ScholarsArchive, 2016. https://scholarsarchive.byu.edu/etd/6230.
Testo completoAbstract (sommario):
Because blades in jet engine compressors are subject to dynamic loads based on the engine's speed, it is essential that the blades are properly "tuned" to avoid resonance at those frequencies to ensure safe operation of the engine. The tuning process can be time consuming for designers because there are many parameters controlling the geometry of the blade and, therefore, its resonance frequencies. Humans cannot easily optimize design spaces consisting of multiple variables, but optimization algorithms can effectively optimize a design space with any number of design variables. Automated blade tuning can reduce design time while increasing the fidelity and robustness of the design. Using surrogate modeling techniques and gradient-free optimization algorithms, this thesis presents a method for automating the tuning process of an airfoil. Surrogate models are generated to relate airfoil geometry to the modal frequencies of the airfoil. These surrogates enable rapid exploration of the entire design space. The optimization algorithm uses a novel objective function that accounts for the contribution of every mode's value at a specific operating speed on a Campbell diagram. When the optimization converges on a solution, the new blade parameters are output to the designer for review. This optimization guarantees a feasible solution for tuning of a blade. With 21 geometric parameters controlling the shape of the blade, the geometry for an optimally tuned blade can be determined within 20 minutes.
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Santos, Cleopas Isa?as. "Experimenta??o animal e direito penal : bases para a compreens?o do bem jur?dico-penal dignidade animal no crime de crueldade experimental (art. 32, ? 1? da lei n? 9.605/98)". Pontif?cia Universidade Cat?lica do Rio Grande do Sul, 2011. http://tede2.pucrs.br/tede2/handle/tede/4862.
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Previous issue date: 2011-01-14O presente trabalho, vinculado ? Linha de Pesquisa Sistemas Jur?dico-Penais Contempor?neos, tem por objetivo analisar e estabelecer as bases para a compreens?o do problema do bem jur?dico-penal tutelado no crime de crueldade experimental de animais, previsto no art. 32, ? 1?, da Lei 9.605/98, tirando da? suas conseq??ncias para a teoria do delito. Para tanto, parte-se da hip?tese de que a resposta ?quele problema encontra-se na compreens?o da dignidade animal, a qual ser? desenvolvida, por op??o metodol?gica, atrav?s de uma abordagem interdisciplinar do tema, estruturada em tr?s ?mbitos de an?lise. Em um primeiro momento, analisam-se os aspectos essenciais da assim chamada ci?ncia da experimenta??o animal para, em continuidade, desenvolver-se o tema da amplia??o da dignidade para al?m dos humanos e, finalmente, alcan?ar-se a discuss?o acerca do bem jur?dico-penal dignidade animal. Esta investiga??o encontra-se comprometida com a teoria do bem jur?dico-penal.
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de, Groot Jens Christian [Verfasser], e Dirk W. [Akademischer Betreuer] Heinz. "Structural Basis for Complex Formation between Human IRSp53 and the Translocated Intimin Receptor Tir of Enterohaemorrhagic E. coli & Structural Characterisation of Amorfrutins Bound to PPAR gamma / Jens Christian de Groot ; Betreuer: Dirk W. Heinz". Braunschweig : Technische Universität Braunschweig, 2012. http://d-nb.info/1175824364/34.
Testo completo
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Jacon, Maria do Carmo Moreira. "Base Qualis: uso e qualidade dos peri?dicos cient?ficos no Programa de P?s-Gradua??o em Psicologia da Pontif?cia Universidade Cat?lica de Campinas (1997-2002)". Pontif?cia Universidade Cat?lica de Campinas, 2006. http://tede.bibliotecadigital.puc-campinas.edu.br:8080/jspui/handle/tede/763.
Testo completoAbstract (sommario):
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Previous issue date: 2006-08-02The present research, of exploratory nature, aims at verifying whether the Qualis base, once implemented, has led to the use of thejournals classified herein, especially the ones of A concept, published nationwide. For that aim, we have defined, as the object of study, Qualis journals in Psychology, and as the context, the Programa de P?s-Gradua??o em Psicologia da Pontif?cia Universidade Cat?lica de Campinas (Pontif?cia Universidade Cat?lica de Campinas Psychology Post-Graduation Program). The universe we have researched composed of a sample of thesis and dissertations claimed between 1997-2002 and a population of mastering and doctorate people enrolled in the Program. The methodological procedures employed herein are the citation analysis and questionnaire application. The analysis of results has shown that a maximum grade does not necessarily lead to effective use. Therefore, it is concluded that consensus (pair evaluation) on which the base is laid does not reflect on the consensus of the segments (professors and alumni) at the Pontif?cia Universidade Cat?lica de Campinas Psychology Post-Graduation Program, in the aforementioned period. The present investigation contributes to reflexion about the methodology used for qualifying journals as scientific assessment instrument for postgraduation programs, as well as it opens understanding possibilities to Qualis base from its use; that is necessarily integrated in the referencial knowledge set which is present in postgraduation formation
A presente pesquisa, de natureza explorat?ria, objetiva verificar se a base Qualis, uma vez implementada induziu o uso dos peri?dicos nela melhor classificados, especialmente peri?dicos de conceito A, de abrang?ncia Nacional. Para tal objetivo, definiu-se como objeto de estudo peri?dicos Qualis da ?rea de Psicologia e como contexto o Programa de P?s- Gradua??o em Psicologia da Pontif?cia Universidade Cat?lica de Campinas. O universo pesquisado constou de uma amostra de teses e disserta??es defendidas no per?odo 1997- 2002 e uma popula??o de mestrandos e doutorandos matriculados no referido Programa. Os procedimentos metodol?gicos empregados foram a t?cnica de an?lise de cita??o e aplica??o de question?rio. A an?lise dos resultados apontou que a atribui??o de conceito m?ximo n?o induz necessariamente o uso efetivo. Conclui-se a partir desse fato que o consenso (avalia??o pelos pares) que fundamenta a base n?o se reflete no consenso dos segmentos (docentes e discentes) do Programa de P?s-Gradua??o em Psicologia da Pontif?cia Universidade Cat?lica de Campinas, no per?odo assinalado. A presente investiga??o contribui para uma reflex?o sobre a metodologia utilizada para classifica??o de peri?dicos como instrumento de avalia??o cient?fica dos programas de p?s-gradua??o e abre possibilidades de entendimento da base Qualis a partir do seu uso, o que necessariamente a integra no conjunto referencial do conhecimento presente na forma??o em p?s-gradua??o
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Millo, Jacques. "Génération de signaux micro-ondes pour la métrologie à partir de références et de peignes de fréquences optiques". Phd thesis, Université Pierre et Marie Curie - Paris VI, 2010. http://tel.archives-ouvertes.fr/tel-00637969.
Testo completoAbstract (sommario):
Les travaux présentés dans cette thèse portent sur la réalisation d'un système de génération de signaux micro-ondes à haute stabilité de fréquence. De tels signaux sont obtenus en asservissant en phase un laser femtoseconde à fibre sur une référence de fréquence optique ultra-stable. On est ainsi capable de transférer la stabilité relative de fréquence d'une référence optique dans le domaine micro-onde. Des lasers ultra-stables ont d'abord été développés afin de servir de référence. Ils sont obtenus en asservissant en fréquence un laser sur une cavité Fabry-Perot. Une étude par calculs numériques puis expérimentale a permis de minimiser l'influence, sur les cavités, de la source de bruit dominante qu'est les vibrations. Grâce à cette démarche et à l'utilisation de miroirs de cavité en silice fondue, deux de ces lasers ultra-stables ont une stabilité relative de fréquence estimée à 4,1×10^(-16) @ 1 s. A partir du laser femtoseconde stabilisé sur l'un des lasers ultra-stable, un signal micro-onde à ~12 GHz est généré avec une stabilité de 3×10^(-15) à 1 s. Une horloge atomique à fontaine, interrogée avec ce signal, atteint une stabilité de 3,5×10^(-14)τ^(-1/2), sa limite fondamentale imposée par le bruit de projection quantique. On montre ainsi que la contribution du bruit du signal d'interrogation sur la stabilité de l'horloge (effet Dick) est rendue négligeable. Enfin, la limitation ultime du processus de transfert de l'optique vers la micro-onde a été mesurée en utilisant la même référence optique pour deux lasers femtosecondes identiques. Après optimisation du système, elle a été évaluée au niveau de 2-3×10^(-16) entre 1 s et 10 s.
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Spiekermann, Geraldine. "Tränen in der modernen Kunst". Doctoral thesis, Humboldt-Universität zu Berlin, Philosophische Fakultät III, 2012. http://dx.doi.org/10.18452/16528.
Testo completoAbstract (sommario):
Tränen überschreiten die Grenzen des Körpers von innen nach außen und werden damit zu einem sichtbaren Anzeichen eines seelischen Extremzustands. In der Arbeit wird untersucht, ob die Träne, die Körpergrenzen gefährdet oder sogar auflöst, in der modernen und gegenwärtigen Kunst Metapher und Trägerin innerästhetischer Transgression werden kann. Dies bedeutet zugleich, dass eine Umwertung der Träne, von der Perle der Reinheit zu einem bedrohlichen Fluidum, stattgefunden hat. Die Träne als eine bedrohliche Grenzüberschreiterin ist ein Motiv, das in früheren Kunstepochen so nicht anzutreffen ist. Damit verweist sie zugleich exemplarisch auf die Auflösungsstrategien, welche die Kunst des 20. und 21. Jahrhunderts bestimmen. Fotoarbeiten von Man Ray, Madame Yevonde und Sam Taylor-Wood, Zeichnungen von Pablo Picasso und Hans Bellmer, Performances von Marina Abramović und Gina Pane, Video-arbeiten von Bill Viola und Bas Jan Ader, Installationen von Daniele Buetti und eine Buchserie von Dieter Roth, denen allen das Motiv der Träne gemeinsam ist, werden in einem Close Rea-ding auf Auflösungstendenzen hin untersucht. Besonderes Augenmerk gilt medienspezifischen Strukturen und Analogien.Tears overstep the bounds of the human body from within – to become evidence of a crit-ical state of mind. The present study examines whether the tear, which endangers or even dispels the boundaries of the body, could be seen as a metaphor and even as an indication of aesthetic transgression in modern and contemporary art. This would mean that the tear as motif has also undergone a paradigm change, from the pearl of purity to a threatening fluid. The aspect of the tear as a transgressor of boundaries is not to be found in earlier periods of art. Accordingly, it also references the process of disintegration, which strongly determines 20th and 21st century art. Photographs by Man Ray, Madame Yevonde and Sam Taylor-Wood, drawings by Pablo Picasso and Hans Bellmer, performances of Marina Abramovic and Gina Pane, video works by Bill Viola and Bas Jan Ader, installations by Daniele Buetti and a series of books by Dieter Roth – which all deal with the tear complex – will be examined in close reading. Their connection with disintegrative tendencies will be scrutinised, and special attention given to media-specific structures and analogies.
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Simon, Fabrice. "Moteur couplé supraconducteur à aimants permanents". Grenoble INPG, 1996. http://www.theses.fr/1996INPG0149.
Testo completoAbstract (sommario):
L'apparition dans les années 80 de semi-conducteurs fonctionnant aux fréquents industrielles avec de très faibles pertes a relancé l'étude des machines supraconductrices. L'association d'un induit supraconducteur statique avec un inducteur à aimants permanents conduit à des moteurs couples robustes. Ces structures hybrides très compactes et légères sont destinées aux systèmes embarqués qui nécessitent de forts couples massiques. Les essais menés sur une maquette de petite puissance ont validé le concept et les calculs théoriques. Pour tirer des conclusions sur cette structure hybride originale il convenait de concevoir, construire et tester une machine de taille significative. L'objet de cette thèse est l'étude de définition de ce démonstrateur de 150 kW à 400 tr/min. En vue de la construction, une étude des matériaux utilisés a été menée, notamment sur les composites en fibres de verre. Les contraintes thermiques expliquent la structure, dite air, des moteurs hybrides. Après une réflexion sur la réalisation de l'induit et l'inducteur, la machine a été calculée à partir d'un programme d'optimisation pour maximiser le rendement rapport au couple massique. Le démonstrateur présente de bonnes caractéristiques, principalement limitées par la cryogénie. De nombreuses simulations numériques avec le programme d'éléments finis flux ont permis de mieux apprécier les caractéristiques de la machine. Enfin, l'extrapolation à de plus forts couples donne une idée du seuil de compétitivité de ces moteurs hybrides et gains possibles en termes de poids, encombrement et rendement. Une comparaison avec une solution classique a été menée pour la chaîne de traction du T. G. V.
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Benzerbadj, Ali. "Approche inter-couches pour l'économie d'énergie et la fiabilité dans les Réseaux de Capteurs Sans Fil dédiés aux Applications Critiques de Surveillance". Thesis, Brest, 2018. http://www.theses.fr/2018BRES0034/document.
Testo completoAbstract (sommario):
Les Réseaux de Capteurs Sans Fil (RCSFs) constituent une classe particulière des réseaux Ad hoc, faisant l'objet de recherches intensives. Ils sont considérés comme un outil très puissant pour connecter le monde physique et le monde numérique. Ils se composent d'un grand nombre de noeuds capteurs dotés de ressources limitées en termes d'énergie, de portée de capture et de communication, de vitesse de traitement et de capacité de stockage. Ils sont déployés dans un environnement intérieur ou extérieur, et ce dans de nombreux domaines d'application tels que l'armée, l'environnement, la santé, la maison et l'agriculture. La rareté des ressources des noeuds capteurs et la non fiabilité des liaisons sans fil motivent la plupart des problématiques dans le domaine des RCSFs, à savoir l'énergie, la couverture, la connectivité, le routage, la tolérance aux pannes et la sécurité. L'objectif de cette thèse est de proposer un protocole de surveillance inter-couches, à efficacité énergétique et fiable, pour la surveillance des zones sensibles clôturées, tel qu'un site pétrolier ou nucléaire, utilisant les réseaux de capteurs sans fil avec un cycle d'activité, et avec prise en compte des liens asymétriques dus au phénomène de l'irrégularité de la radio. Initialement, le protocole proposé identifie les noeuds de bordure du RCSF pour les utiliser comme nœuds sentinelles, c.-à-d., des noeuds qui sont toujours dans un état actif. Les noeuds restants sont utilisés en tant que noeuds relais avec un cycle d'activité, pendant la phase de routage des alertes vers le noeud puits. Le processus d'identification des noeuds de bordure ainsi que le routage des alertes, sont assurés par le protocole Greedy Perimeter Stateless Routing through Symmetrical Links (GPSR-SL) qui est une version améliorée du protocole GPSR, reposant sur un graphe de connectivité représenté sous forme de disques non-unité (N-UDG). Le protocole de surveillance inter-couches proposé a été implémenté et ses performances ont été évaluées en utilisant l'environnement de simulation OMNeT++/Castalia. Les résultats de performance montrent que ce protocole permet d'obtenir un ratio de livraison de paquets plus élevé d'environ 3.63%, une efficacité énergétique et une latence satisfaisante par rapport au même protocole basé sur le GPSR originalWireless Sensor Networks (WSNs) are a special class of Ad hoc networks, which are under intensive research.They are considered as a very powerful tool to connect the physical and the digital worlds. They consist of a largenumber of sensor nodes that are characterized with limited resources in terms of energy, range of sensing and communication, processing speed and storage capacity.They are deployed in an indoor or outdoor environment in many application domains such as army, environment, health, home and agriculture. The scarcity of sensor node resources and the unreliability of wireless links drive most of the research issues in the field of WSNs, namely energy, coverage, connectivity, routing, fault tolerance and security. The aim of this thesis is to propose an energyefficient and reliable cross-layer surveillance protocol for sensitive fenced areas, such as oil or nuclear sites, using duty-cycled WSNs with asymmetrical links due to the radio irregularity phenomenon. Initially, the proposed protocol identifies the boundary nodes of the deployedWSN, to be used as sentinel nodes, i.e., nodes that are always in an active state. The remaining nodes are usedas duty-cycled relay nodes during the routing phase to relay alerts towards the sink. The boundary nodes identification process and alert routing are both performed using an enhanced version of the Greedy Perimeter Stateless Routing (GPSR) protocol, referred to as GPSR over Symmetrical Links (GPSR-SL) and which relies on a Non Unit Disk Graph (N-UDG). The proposed cross-layer surveillance protocol has been implemented and its performance has been evaluated under the OMNeT++/Castalia simulation environment. Performance results show that this protocol achieves higher Packet Delivery Ratio by up to 3.63%, energy .efficiency and satisfactory latency when compared to the same protocol based on the original GPSR
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Podal, Pavel. "Studium vlastností katalyzátoru na bázi MnOx s využitím RRDE". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219064.
Testo completoAbstract (sommario):
This master thesis deals with qualifications of the catalytic materials for positive electrode low-temperature fuel cells. The teoretical part focuses on the physical and chemical properties of low-temperature fuel cells. There are described methods of hydrodynamic RDE and RRDE. RRDE study utilizes methods linear and cyclic voltammetry for qualifying performance of catalytic materials and presentation of results. The practical part describes the preparation various types of carbon materials. There are monitored the oxygen reduction using RRDE. Catalytic materials are evaluated: CV, stability, kinetic parameters, creation of intermediate H2O2 and kinetics of electrode reactions.