Dissertations / Theses on the topic 'Protreptique à la conversion'
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1
Naud, Jonathan. "Le stoïcisme impérial et la conversion philosophique." Mémoire, Université de Sherbrooke, 2010. http://savoirs.usherbrooke.ca/handle/11143/2667.
Abstract:
Ce mémoire cherche à mieux comprendre le phénomène de la conversion philosophique dans l'Antiquité, plus particulièrement dans le stoïcisme impérial (Sénèque, Épictète, Marc Aurèle). Après une analyse conceptuelle de la conversion qui s'appuie sur des sources contemporaines, ce mémoire fait l'étude des interprétations de la conversion stoïcienne par Pierre Hadot et Michel Foucault. Cette étude se conclut sur le constat de problèmes importants dans ces deux interprétations. Ce mémoire poursuit avec une analyse lexicologique des termes grec (epistrophè) et latin (conversio) pouvant désigner la conversion dans le corpus stoïcien. Cette analyse se termine sur un autre constat d'échec, rejetant ces termes comme des traductions du concept de conversion. Le dernier chapitre de ce mémoire montre qu'en inscrivant le stoïcisme et Épictète en particulier dans la tradition protreptique socratique on peut mieux comprendre la conversion stoïcienne.
2
Martin, Lucie. "Le poème d'Orientius : introduction, texte critique, traduction et commentaire." Electronic Thesis or Diss., Strasbourg, 2023. http://www.theses.fr/2023STRAK003.
Abstract:
La Gaule de la première moitié du Ve siècle, en proie aux invasions barbares, a été le lieu d’une floraison poétique bien particulière. À cette époque, plusieurs poèmes, marqués par les troubles de l’actualité, emploient les anciennes formes de la poésie légère pour traiter de la conversion ascétique de diverses manières. Parmi ces « examens de conscience », nous reprenons l’appellation de J. Fontaine, l’on trouve le poème d’Orientius, connu sous le titre générique de commonitorium. Ce poème de 1036 vers, rédigé en distiques élégiaques, est un protreptique à la vie de conuersus, qui invite spécifiquement à la fuite des vices. Son enjeu est tout à la fois l’exhortation à la conversion ascétique et la christianisation de l’héritage élégiaque. Cette étude propose une nouvelle édition du poème, accompagnée d’une traduction française et d’un commentaire, et précédée d’une introduction qui évalue à nouveaux frais notamment les questions d’attribution, de structure et de finalité du poèmeWhile struggling with barbarian invasions, first half of 5th century Gaul saw the blossom of a specific poetic trend. Then, some writers used the antique forms of light poetry to handle the subject of ascetic conversion in different ways, as they created a literary production shaped by the difficulties of their time. Among these « examinations of conscience », as J. Fontaine called them, there is the poem of Orientius, known nowadays under the generic title of commonitorium. Written in elegiac couplet, this 1036-line poem stands as a protreptic to a conuersus’s life, which calls specifically to run away from vices. It aims at both exhorting the reader to ascetic conversion, and christianizing elegiac inheritance. This study contains a new critical edition of the poem, with a French translation, a commentary and an introduction, reevaluating various issues, namely that of attribution, structure and goals of the poem
3
Van, der Meeren Sophie. "Protreptique et philosophie, étude sur la constitution d'un genre." Lille 3, 1999. http://www.theses.fr/1999LIL3A006.
4
Damas, Juan Roberto. "On Conversion." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/35812.
Abstract:
The conversion of the convent of San Francisco into a school of architecture in Havana, comes out of my omnipresent desire to work with old structures, my faith in architectural education, and my love for he city in which I was born. My intention was to propose an alternative to conventional restoration and preservation. From the mutilated body of the convent, and the seed of education planted by the monks the new school sprung. The memory of the lost limbs, still present in the city, began to materialize slowly, letting the old structure breathe again.Master of Architecture
5
Jourdan, Fabienne. "Orphée, du repoussoir au préfigurateur du Christ : réécritures d'un mythe à des fins de polémique religieuse." Paris 1, 2007. http://www.theses.fr/2007PA010532.
Abstract:
La plus étonnante métamorphose connue par le mythe d'Orphée est celle qui transforme le chantre des dieux païens en préfiguration du Christ. L'étude de cette mutation dans le Protreptique de Clément d'Alexandrie permet d'aborder la manière dont se renouvelle une figure mythique au gré des polémiques. Après un préambule sur le genre protreptique, nous montrons comment Clément élabore un portrait d'Orphée en repoussoir du Christ puis comment cette condamnation fait place à une hellénisation du Christ en Orphée supérieur avant qu'Orphée lui-même ne soit «converti ». Nous examinons enfin le traitement du personnage et de son œuvre chez les auteurs chrétiens des cinq premiers siècles pour faire apparaître les différentes argumentations servies par la convocation d'Orphée et tenter de répondre à cette question fondamentale: pourquoi Orphée, plutôt qu'un autre théologien, a-il été la figure païenne privilégiée afin d'élaborer un repoussoir caricatural puis une préfiguration du Christ ?
6
York, Andrew P. E. "Methane conversion chemistry." Thesis, University of Oxford, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334954.
7
Brown, S. S. "Conversion of notations." Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.596970.
Abstract:
Music, engineering, mathematics, and many other disciplines have established notations for writing their documents. The effectiveness of each of these notations can be hampered by the circumstances in which it is being used, or by a user's disability or cultural background. Adjusting the notation can help, but the requirements of different cases often conflict, meaning that each new document will have to be transformed between many versions. Tools that support the programming of such transformations can also assist by allowing the creation of new notations on demand, which is an under-explored option in the relief of educational difficulties. This thesis reviews some programming tools that can be used to manipulate the tree-like structure of a notation in order to transform it into another. It then describes a system "4DML" that allows the programmer to create a "model" of the desired result, from which the transformation is derived. This is achieved by representing the structure in a geometric space with many dimensions, where the model acts as an alternative frame of reference. Example applications of 4DML include the transcription of songs and musical scores into various notations, the production of specially-customised notations to assist a sight-impaired person in learning Chinese, an unusual way of re-organising personal notes, a "website scraping" system for extracting data from on-line services that- provide only one presentation, and an aid to making mathematics and diagrams accessible to people with severe print disabilities. The benefits and drawbacks of the 4DML approach are evaluated, and possible directions for future work are explored.
8
Borer, Tim. "Television standards conversion." Thesis, University of Surrey, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317305.
9
Condoluci, Andrea <1990>. "Beta-Conversion, Efficiently." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amsdottorato.unibo.it/9444/1/main-9.pdf.
Abstract:
Type-checking in dependent type theories relies on conversion, i.e. testing given lambda-terms for equality up to beta-evaluation and alpha-renaming.
Computer tools based on the lambda-calculus currently implement conversion by means of algorithms whose complexity has not been identified, and in some cases even subject to an exponential time overhead with respect to the natural cost models (number of evaluation steps and size of input lambda-terms).
This dissertation shows that in the pure lambda-calculus it is possible to obtain conversion algorithms with bilinear time complexity when evaluation is carried following evaluation strategies that generalize Call-by-Value to the stronger case required by conversion.
10
Koros, Georgios. "Reducing the cost of conversion projects through design for ship conversion." Thesis, University of Newcastle upon Tyne, 2017. http://hdl.handle.net/10443/3667.
Abstract:
The Thesis develops design and production methods to reduce cost, duration and risks of conversions. It reviews the literature on the nature of conversion and its correlation to ship-repair and shipbuilding. It examines the market, in particular for tanker to bulk carrier conversions. Literature on ship design for production, project management and risk is reviewed to identify potentially valuable ideas to improve the conversion process. The case study conversion was completed in a conversion yard, using conventional techniques and planning. The design of the final bulk carrier was also conventional. The work was completed afloat, creating potential risk of structural damage which required carefully managed actions, e.g. work inside cargo holds to be carried out sequentially. A project completion review identified this and access difficulties as slowing the work. A number of cost inducing conversion bottlenecks had not been obvious at the start. An alternative design is proposed for subsequent projects, moving strength members above deck, minimizing bottlenecks present with the initial design. Indicatively, by providing adequate deck strength early in the conversion, work in the cargo holds could proceed more quickly. A plan for conversion is developed alongside the design. The alternative design shows a significant cost and time saving. The results are developed to offer a general basis for design for conversion, adapting shiprepair and design for production principles and proposes the following: - The need to understand conversions in depth and improve planning. - The need to engage all parties (design and production) in a collaborative project. - Mitigation of risks focusing on production methods. - A dedicated Goal-Based Design for Conversion approach that avoids, where possible, difficult internal structural work. - Evaluating the need for Dry Dock in major conversions; it may not always be necessary or beneficial, contrary to popular belief and current Bibliography.
11
Dorsey, Andrew Hanson. "Pragmatic conversion: Hypocrisy and the mechanics of seventeenth-century Puritan conversion discourse." Diss., Connect to online resource, 2005. http://wwwlib.umi.com/dissertations/fullcit/3165828.
12
McGever, Michael Sean. "Early evangelical conversion theology : John Wesley and George Whitefield's theologies of conversion." Thesis, University of Aberdeen, 2018. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=237584.
Abstract:
This thesis offers an examination of John Wesley and George Whitefield's theologies of conversion. The thesis is a work of historical theology which utilises the operant theologies of conversion present in these two figures in order to produce a work of espoused theology so as to state, in a way that has not previously been articulated systematically and directly, the theologies of conversion of Wesley and Whitefield. The argument of the thesis is that Wesley and Whitefield's theologies of conversion are best understood as an inaugurated teleology with an emphasis on the telos of salvation rather than the arché of salvation. The thesis argues that one can articulate nine synoptic statements of the espoused theology of conversion by attending to the operant theologies of conversion in the works of Wesley and Whitefield. First, conversion is initiated and sustained by the grace of God. Second, conversion is the experiential correlate to salvation. Third, conversion is a turning from self and to Christ. Fourth, conversion is foreshadowed by a deep sense of sinfulness. Fifth, conversion arrives by faith in an instant. Sixth, conversion is inaugurated instantaneously, but is not always recognisable on behalf of the convert. Seventh, conversion is marked by ongoing good works. Eighth, baptism marks one's entrance to the church but is not chronologically tied to conversion. And finally, ninth, assurance of salvation is available but not required for a genuine convert. It will be suggested that Wesley and Whitefield's accounts of conversion are both accurately understood in a summative way as inaugurated teleology. The thesis concludes with a summary of the argument, the contribution to knowledge, and by noting avenues for further study.
13
Camilli, Coralie. "Messianisme, violence et conversion." Thesis, Paris Est, 2016. http://www.theses.fr/2016PESC0011.
Abstract:
Notre recherche s’autorise d’une réflexion sur le messianisme continûment menée à partir des sources juives, essentiellement bibliques et talmudiques. Depuis cet indispensable point de départ, elle s’interroge centralement sur la possibilité d’une conversion de la violence en tout autre chose qu’elle-même, à savoir en droit, dès lors que celui-ci est entendu à la lumière du droit hé-braïque, c’est-à-dire ouvert sur son propre au-delà. Cette ouverture est ici comprise à partir du temps et de la loi, de leur relation. Car le juridique et le messianique s’entre-confortent, moyennant toute une série de mises au point et de clarifications quant à leurs temporalités propres. Le messianisme ap-paraît ainsi au fil de notre investigation comme un défi conceptuel par où tentent de s’articuler les particularités de l’existence historique, les exigences politiques et les promesses prophétiques. Il permet ainsi d’engager une ré-flexion originale et singulière sur l’Etat, la politique, l’histoire, les rapports entre le religieux et ses formes sécularisées, le droit et la vieOur thesis develops a reflection on the messianism continuously led from the Jewish, essentially biblical and talmudic sources. Since this essential starting point, we think here about the possibility of a conversion of the vio-lence in something quite different that itself, namely right or law, since this one is understood in the light of the Hebraic right, that is opened on his own beyond. This opening is understood here from time and law, from their rela-tion. Because the legal and the messianic enters consolidate, as a result of a whole series of clarifications and clarifications as for their appropriate tem-porality. The messianism so appears in our investigation as a theoretical challenge, which try to articulate the peculiarities of the historic existence, the political requirements and the prophetic promises. He so allows to have an original and singular reflection on State, politics, history, the relation-ships between religion and its secularized forms, right and life
14
Vasi, Shiva. "Conversion to Zen Buddhism." Monash University, School of Political and Social Inquiry, 2004. http://arrow.monash.edu.au/hdl/1959.1/9601.
15
Forget, Mario. "Conversion religieuse, libération humaine." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq25404.pdf.
16
Kafka, John Anton (Tony). "Survey of childhood conversion." Theological Research Exchange Network (TREN), 1987. http://www.tren.com.
17
Forsyth, A. J. "Switched-mode power conversion." Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233948.
Abstract:
The thesis begins with a general introduction to switched-mode power conversion. The main application areas of the technique are outlined and a summary is presented of current research work. The following chapters then focus on one recent development in the field, the Cuk converter and integrated magnetics. First, the steady-state performance limitations of the Cuk converter are explored through a comparison with the basic switched-mode converter topologies. The circuit is seen to possess several attractive properties including input and output current waveforms which are continuous rather than pulsating. However, the switching losses are shown to be high. A regenerative snubber is presented which reduces the transistor turn-off loss whilst preserving the high-quality input and output current waveforms of the converter. The integrated magnetics technique is discussed in the following chapter. This is the technique whereby converter magnetic components are coupled to eliminate input and output ripple currents and therefore improve steady-state performance. The possible problems are highlighted of attempting to couple transformers and inductors on a single core and an alternative coupling technique is outlined which uses an auxiliary electric circuit. The introduction of magnetic coupling in the Cuk converter to eliminate input and output ripple currents and improve steady-state performance results in more complicated dynamic characteristics and a more complex control problem. The state-space averaging technique is used in chapter 4 with the aid of a control engineering design package, CLADP, to analyse the problem. The impact of component coupling on the converter dynamic characteristics is explained and possible control strategies are suggested and verified. Finally, the Cuk converter with component coupling is assessed as a large-signal waveshaper. Several inverter configurations are examined in which a switched-mode converter operating under closed-loop control is used as a waveshaper to synthesise high-quality sinusoidal output currents. The implementation of the schemes using a Cuk converter with component coupling is described.
18
Oki, Makanjuola. "Conversion coatings on aluminium." Thesis, University of Manchester, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390302.
19
Gerry, David Brian. "High voltage power conversion." Thesis, University of Nottingham, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.396620.
20
McGury, Susan. "Primitivism and cultural conversion." Thesis, University of Reading, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309516.
21
Walker, Dane E. "Enhanced molybdate conversion coatings." Thesis, Loughborough University, 2013. https://dspace.lboro.ac.uk/2134/12209.
Abstract:
The replacement of chromate conversion coatings for zinc coated components has been necessitated by the materials finishing industries due to the inherent toxicity issues with Cr(VI) and the legislative enforcement of WEEE and ELV Directives by the European Union. Current replacements are based on non-chromate , Cr(III) systems, these may be perceived by some to be problematic as they still contain chromium . Molybdate based conversion coatings have long been viewed by many researchers to be a viable non-chromium alternative due to their low toxicity. An extensive literature review of the research carried out in the last 20 years was carried out, highlighting areas of interest for improving the corrosion resistance of the coatings studied. These were, primarily, the synergesis that exists with molybdate and phosphate compounds for corrosion resistance and the incorporation of nanoparticle silica into treatment solution. Also discovered was the importance of the acid used to adjust treatment solution pH, immersion time, oxidising agent additions and the incorporation of rare earth metal species. Silicate sealant layers were also highlighted as a post treatment. Molybdate-based coatings were formed on commercial electrodeposited acid zinc surfaces. Many treatment conditions were investigated, and initially performance analysed using DC Linear Polarisation Resistance (LPR) trials. Subsequently, the highest performing coatings were subjected to the more aggressive, industry standard, ASTM B 117 Neutral Salt Spray (NSS) corrosion test. The highest performing molybdate coatings were found to have an average LPR of ~ 9 000 Ω. cm2, in contrast to ~ 12 000 Ω. cm2 for the Cr(VI) based reference. NSS results were amongst the highest performing for molybdate based coatings documented, at 24 h until 5% white rust, however remained inferior to Cr(VI) coatings, which lasted 120 h. The highest performing coatings were characterised using FEG-SEM, Cryofracture EDXA and site specific AES. These techniques revealed that the enhanced molybdate coatings had a columnar structure that was around 300 nm thick, with pores that appeared to expose the substrate. AES showed this type of coating to have a mixed Mo, P and Zn oxide surface. Corrosion initiation was also studied; this can be thought of as an investigation to determine the point(s) of weakness or the mechanism that causes coating failure. Coatings were immersed in 5 % wt/ vol NaCl(aq) until they showed any surface change. Initial signs of corrosion were deemed to be any appearance of pitting or discolouration of the film, not a voluminous corrosion product. Untreated Zn, Cr(VI) and simple molybdate coatings were studied as well as enhanced molybdate coatings. There were clear differences in the way the coatings behaved at the onset of corrosion. Cr(VI) coatings delaminated, leaving an area of decreased Cr concentration. The enhanced molybdate coatings failed by the appearance of localised pores of ~ 70 µm in diameter. Substrate exposure was indisputably the reason for coating failure in chloride environments. In light of the work carried out in the present thesis the outlook for the use of molybdate as a potential replacement for chromate for the conversion coating of electrodeposited zinc surfaces is a positive one.
22
Lundin, Staffan. "Marine Current Energy Conversion." Doctoral thesis, Uppsala universitet, Elektricitetslära, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-280763.
Abstract:
Marine currents, i.e. water currents in oceans and rivers, constitute a large renewable energy resource. This thesis presents research done on the subject of marine current energy conversion in a broad sense. A review of the tidal energy resource in Norway is presented, with the conclusion that tidal currents ought to be an interesting option for Norway in terms of renewable energy. The design of marine current energy conversion devices is studied. It is argued that turbine and generator cannot be seen as separate entities but must be designed and optimised as a unit for a given conversion site. The influence of support structure for the turbine blades on the efficiency of the turbine is studied, leading to the conclusion that it may be better to optimise a turbine for a lower flow speed than the maximum speed at the site. The construction and development of a marine current energy experimental station in the River Dalälven at Söderfors is reported. Measurements of the turbine's power coefficient indicate that it is possible to build efficient turbines for low flow speeds. Experiments at the site are used for investigations into different load control methods and for validation of a numerical model of the energy conversion system and the model's ability to predict system behaviour in response to step changes in operational tip speed ratio. A method for wake measurements is evaluated and found to be useful within certain limits. Simple models for turbine runaway behaviour are derived, of which one is shown by comparison with experimental results to predict the behaviour well.
23
Kovalenko, A. "Conversion in modern English." Thesis, Sumy State University, 2016. http://essuir.sumdu.edu.ua/handle/123456789/49160.
Abstract:
Nowadays the number of conversion is extremely increasing, so it is very important to examine some new trends of conversion. 100 conversions selected from the Internet were the material for our research. To study conversion of new trends we conducted their quantitative analysis.
24
Hults, Christopher S. "Shakespeare's Cultural Capital Conversion." BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/7736.
Abstract:
Shakespeare's vast cultural capital does not often translate easily to financial capital.Whether those who invest in Shakespeare seek financial, educational, or cultural gain, anunderstanding of capital conversion as it relates to Shakespeare industries can inform decisionsand clarify goals. After clarifying and delineating what we have and know of Shakespeare before1616 and what has been created by culture regarding him after 1616, we label the latterShakesaltation, then seek the key to converting his cultural capital to financial capital. ApplyingPierre Bourdieu's states of cultural capital to the Shakespeare industry illustrates why manyinvestments fail, few succeed, and why: cultural capital must be in its institutionalized state inorder to be convertible to profit. Juxtaposing three case studies of Shakespeare industries (Film,Cultural Destination Tourism, and the Bard Branding practice in various industries), analyzedusing Bourdieu, confirms that Shakesaltation — the ideals and myths that have been createdaround Shakespeare beyond his death — are the key to profiting from Shakespeare.
25
Brukner, Jan. "Non-Parallel Voice Conversion." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2020. http://www.nusl.cz/ntk/nusl-417207.
Abstract:
Cílem konverze hlasu (voice conversion, VC) je převést hlas zdrojového řečníka na hlas cílového řečníka. Technika je populární je u vtipných internetových videí, ale má také řadu seriózních využití, jako je dabování audiovizuálního materiálu a anonymizace hlasu (například pro ochranu svědků). Vzhledem k tomu, že může sloužit pro spoofing systémů identifikace hlasu, je také důležitým nástrojem pro vývoj detektorů spoofingu a protiopatření. Modely VC byly dříve trénovány převážně na paralelních (tj. dva řečníci čtou stejný text) a na vysoce kvalitních audio materiálech. Cílem této práce bylo prozkoumat vývoj VC na neparalelních datech a na signálech nízké kvality, zejména z veřejně dostupné databáze VoxCeleb. Práce vychází z moderní architektury AutoVC definované Qianem et al. Je založena na neurálních autoenkodérech, jejichž cílem je oddělit informace o obsahu a řečníkovi do samostatných nízkodimenzionýálních vektorových reprezentací (embeddingů). Cílová řeč se potom získá nahrazením embeddingu zdrojového řečníka embeddingem cílového řečníka. Qianova architektura byla vylepšena pro zpracování audio nízké kvality experimentováním s různými embeddingy řečníků (d-vektory vs. x-vektory), zavedením klasifikátoru řečníka z obsahových embeddingů v adversariálním schématu trénování neuronových sítí a laděním velikosti obsahového embeddingu tak, že jsme definovali informační bottle-neck v příslušné neuronové síti. Definovali jsme také další adversariální architekturu, která porovnává původní obsahové embeddingy s embeddingy získanými ze zkonvertované řeči. Výsledky experimentů prokazují, že neparalelní VC na nekvalitních datech je skutečně možná. Výsledná audia nebyla tak kvalitní případě hi fi vstupů, ale výsledky ověření řečníků po spoofingu výsledným systémem jasně ukázaly posun hlasových charakteristik směrem k cílovým řečníkům.
26
Martins, Jose Endoença. "A politics of conversion." Florianópolis, SC, 2002. http://repositorio.ufsc.br/xmlui/handle/123456789/82730.
Abstract:
Tese (doutorado) - Universidade Federal de Santa Catarina, Centro de Comunicação e Expressão. Programa de Pós-Graduação em Letras.Made available in DSpace on 2012-10-19T17:48:13Z (GMT). No. of bitstreams: 0Bitstream added on 2014-09-26T02:23:07Z : No. of bitstreams: 1 183607.pdf: 6591745 bytes, checksum: 0ccb91ca51229495b5f5d1bd81ab1f0f (MD5)
O estudo Uma Política de Conversão: Niilismo e Amor na Ficção de Toni Morrison começa com a idéia de que a Literatura Afro-Americana apresenta um sentido de auto-reflexividade e hibridismo, através do qual autobiografia dialoga com romance, o espiritual se funde com o político. A partir deste traço dialógico a auto-reflexividade é politicamente estabelecida entre niilismo e amor. Na política de conversão, o estudo analisa as formas como mulheres negras, individualmente ou em grupo, fogem da escravidão para a liberdade, avançam da individualidade para a coletividade, ou substituem niilismo por amor. Metodologicamente o estudo apresenta sete capítulos. O primeiro discute os aspectos dialógicos que ilustram as conexões entre narrativas espirituais, de escravos e ficção, entre espiritualidade e política. O segundo examina o diálogo entre a conversão, pregação pública e formação da comunidade em Diário e Experiências Religiosas de Lee. O capítulo sugere que ao afirmar espiritualidade e humanidade a narradora abre profundo espaço para a mulher negra reclamar direitos civis. O terceiro discute o diálogo no interior da política de conversão entre narrativa de escravos e ficção. Este diálogo lida com niilismo e amor em Incidentes de Jacobs e Amada, Sula e O Olho Mais Azul de Morrison. Para a análise de niilismo e amor valores individuais e coletivos são considerados em relação a cinco aspectos: ambiente e agente antagonistas, agente de apoio, propósito da personagem e resultado alcançado. É visível, no estudo, o apoio que certas mulheres recebem de suas comunidades para contra-atacar antagonistas. O apoio nem sempre resulta na superação do niilismo e, por isso, derrota temporária pode ocorrer antes que elas sejam reintegradas à comunidade, como acontece com Linda Brent. O quarto capítulo examina as fraquezas e as energias da política da conversão e a reintegração de Sethe Suggs à comunidade de Bluestone Road. O quinto avalia como a comunidade de Bottom tenta controlar a individualidade de Sula Peace e como um grupo de mulheres lideradas por Nel Wrights consegue resgatar o espírito de independência da heroína. O sexto mostra como a política da conversão das mulheres de Lorain é incapaz de garantir a saúde mental de Pecola Breedlove, mas consegue criar um papel mais consistente para o grupo. No sétimo, a conclusão examina da relação dialética entre niilismo e amor ou auto-amor nas experiências dos indivíduos e dos grupos. O estudo sugere que em Incidentes a busca de Linda Brent por liberdade envolve elementos de autodestruição e de autoempoderamento. Da mesma maneira, o estudo conclui que em Amada o amor que Sethe Suggs tem para as suas crianças mata a própria filha, enfatizando, assim, o desejo de livrá-la da escravidão. Igualmente em Sula, a individualidade de Sula Peace não apenas limita, mas também expande as experiências do grupo, levando-o à emancipação. Finalmente, em O Olho Mais Azul a luta de Pecola Breedlove por amor e beleza reflete auto-ódio ao mesmo tempo em que reconstrói a auto-apreciação de toda a comunidade.
27
Crook, Zeba A. "Reconceptualising conversion : patronage, loyalty, and conversion in the religions of the ancient Mediterranean /." Berlin [u.a.] : de Gruyter, 2004. http://www.loc.gov/catdir/toc/fy0611/2004471591.html.
28
Molloy, Mary Carmel. "Conversion select biblical characteristics with questions for discussion /." Theological Research Exchange Network (TREN), 1992. http://www.tren.com.
29
Bonté, Rosalind Suzanne. "Conversion and coercion : cultural memory and narratives of conversion in the Norse North Atlantic." Thesis, University of Cambridge, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708971.
30
Zhao, Yixin. "Developing Nanomaterials for Energy Conversion." Cleveland, Ohio : Case Western Reserve University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=case1270172686.
31
Krufka, Stephen Edward. "Visual to tactile conversion theory." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file 0.79 Mb., 82 p, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:1435831.
32
Laestander, Joakim, and Simon Laestander. "OTEC - Ocean Thermal Energy Conversion." Thesis, KTH, Energiteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-98974.
Abstract:
OTEC is a technology where power is produced by utilizing the temperature difference in the oceans between surface water and water from the deep. It is considered that a temperature difference of 20K is required – a temperature difference found close to the equator.This report investigates if OTEC can produce enough electricity to provide 100 000 people, living on a generic island of 10 km2 somewhere alongside the equator in the pacific ocean, with their electricity needs. In this project a literature review has been made to establish a basic knowledge of OTEC and later a mathematical model has been programmed and simulated. Finally the results of the simulation has been examined and discussed.Two different cycles has been simulated alongside each other with the goal to establish which one of these two cycles that were best suited the island. To facilitate computing some assumptions and simplifications were made.The closed cycle (CC) was the most effective but the open cycle (OC) had several positive synergies that the closed cycle didn’t have. The costs of a facility of both cycles were based on older studies in the field and the conclusion was that the open cycle was the cheaper one. Facilities of both cycles can effectively meet the islands energy needs but if OC is chosen before CC more facilities has to be built due to the OC has lower energy output.Further work and development is necessary before OTEC seriously can challenge todays fossil fuel based energy systems, or until the oil starts to get too expensive. Today OTEC technology demands large investments but if the positive environmental effects and the fact that the island releases itself from import of energy are taken into account there are incentives to invest in OTEC already.OTEC är en teknik där kraft utvinns från havsvatten genom att utnyttja temperaturdifferensen mellan ytvatten och vatten från djupet. Denna teknik kräver dock generellt en temperaturdifferens på minst 20K. En sådan temperaturskillnad är geografiskt begränsad till den tropiska zonen runt ekvatorn.I rapporten undersöks om OTEC kan användas till att förse 100 000 människor, boende på en 10 stor generisk ö i just den tropiska zonen, med dess elbehov. I detta projekt har det gjorts en litteraturstudie för att etablera en kunskapsbas och sedan gjorts en matematisk modell i programmet EES och slutligen har resultaten från modellen granskats och diskuterats. I modellen jämfördes två olika cykler och målet var att bestämma vilken av dessa som var det bästa alternativet för ön. För att underlätta beräkningarna gjordes vissa antaganden och förenklingar.Den slutna cykeln var mest effektiv men den öppna cykeln (OC) hade positiva synergieffekter som den sluta cykeln (CC) saknade. Kostnaden för en anläggning baserades på äldre studier och enligt dessa var den öppna cykeln billigare än den slutna. Anläggningar av de båda cyklerna kan tillgodose den fiktiva öns energibehov, det behöver dock byggas fler anläggningar om OC väljs framför CC.Det kommer krävas ytterligare arbete med att utveckla tekniken innan OTEC på allvar kan utmana dagens fossilbränslebaserade energisystem – eller att oljan helt enkelt blir för dyr. Idag är OTEC för dyrt för att kunna motiveras rent ekonomiskt, men om även miljövinsterna beaktas, samt att ön befriar sig från importer och därigenom får större kontroll över sitt eget energisystem, finns goda incitament att investera i OTEC redan idag.
33
Lavery, Jonathan Allen. "Education, conversion and Plato's Protagoras." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape15/PQDD_0027/NQ31886.pdf.
34
Aitken, Wendy Ann Jewkes. "Storytelling and conversion in children." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/MQ64035.pdf.
35
Saucier, Scott. "Multiband Analog-to-Digital Conversion." Fogler Library, University of Maine, 2002. http://www.library.umaine.edu/theses/pdf/SaucierS2002.pdf.
36
Rajagopal, Murali. "Protocol conversion : an algorithmic approach." Diss., Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/13352.
37
Ho, Ching-Hsiang. "Speaker modelling for voice conversion." Thesis, Brunel University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365076.
38
Ashcroft, Alexander T. "Methane conversion over oxide catalysts." Thesis, University of Oxford, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305983.
39
Etheridge, Andrea Mary. "Conversion coatings on aluminium alloys." Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307051.
40
Rentzos, Dimitrios. "Speaker modelling for voice conversion." Thesis, Brunel University, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.483558.
41
Smith, Neville Stuart. "A colour notation conversion program." Thesis, Teesside University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.279428.
42
MacDonald, Paul S. "Descartes, Husserl and radical conversion." Thesis, Durham University, 1996. http://etheses.dur.ac.uk/5244/.
Abstract:
Phenomenology has been one of the most influential and far-reaching developments in 20th Century Philosophy and has had a great impact on the disciplines of philosophy of logic and math, theory of knowledge, and theory of meaning. The most profound influence on Edmund Husserl (1859 - 1938), the founder of phenomenology, was Rene Descartes (1596 - 1650), whose radical rethinking of philosophy’s overall project provided Husserl with both the historical and conceptual point of departure for his foundation of prima philosophia. Despite this explicit and well-known influence, there is no book- length study of their thematic parallels; numerous Journal articles focus almost entirely on the phenomenological reduction and, aside from this, are fairly unsatisfactory. The purpose of the present work is to elucidate systematic convergences (and divergences) between Descartes and Husserl throughout their respective philosophical developments. This comprises explication of several central topics: 1. The parallel between 17th C. skepticism, which Descartes attempted to overthrow, and 19th C. psychologism and relativism, which Husserl reacted against. 2. The striking similarity at the level of formal ontology between Descartes' simple and complex natures and Husserl's part-whole theory. 3. A clarification of the Cartesian sense of methodical doubt and how Husserl's mistaking of this shaped the initial formulation of the reduction. 4. Convergence in the maturation of the primitive notion of intuition as "clear and distinct seeing" and "seeing of essences" for both thinkers. 5. An analysis of the modes of methodical doubt, in terms of steps in the cognitive act of doubting, and not merely in the content of that which is doubted. 6. Far-reaching divergences in that Descartes was motivated to establish with scientific certainly an entirely new world of being, whereas Husserl was concerned to disclose an entirely new sense of the world. As such, thematic convergences between Descartes and Husserl are not due to accidental intersections of interest, nor are they curiosities of the comparative method in historical research. These parallels are intrinsic and systematic due to an overarching congruence in their visions of the starting point, methodological procedures, and reaction to pseudo-scientific matters-of-fact in the founding of a genuine philosophical project.
43
Xu, Shaojun. "Plasma-assisted conversion of CO2." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/plasmaassisted-conversion-of-co2(19c87dfa-ba79-47ea-a63d-0a0026a03bba).html.
Abstract:
The transformation of carbon dioxide into added value chemicals by a plasma-activated catalytic process was studied. First of all, the current status of CO2 reutilisation by plasma-assisted technologies was reviewed. Followed by an in-depth study on the process of plasma-catalysis, the effects of dilution gas (i.e. argon and nitrogen) addition and operating parameters in CO2 dissociation were systematically investigated in non-thermal atmospheric pressure plasma barium titanate (BaTiO3) packed-bed reactor from both an engineering and scientific point of view. The extensive experimental and modelling study provided an insight into the relationship between the operating parameters, plasma electrical properties and electron-induced reaction processes in the discharge and the effect of the dilution gases on the product formation and reaction mechanism. The results showed that there was a higher CO2 conversion and energy efficiency in the studied packed-bed reactor than the dielectric barrier discharge (DBD) reactor with and without packed materials using electrodes covered by dielectric layers. Based on the above research work, an in-depth study of the complex mechanism of plasma-catalysis interface reaction was carried out. A new model catalyst (Ni/α-Al2O3 nanocatalyst) with a minimum of physical and chemical variables was specifically designed and synthesised for plasma-assisted reactions to help directly understand the intrinsic role of catalytic active sites during the plasma-catalytic process. In situ time-resolved tuneable lead salt diode laser (TDL) diagnostics of carbon dioxide decomposition over the model catalysts in a planar dielectric barrier discharge (DBD), non-thermal atmospheric pressure plasma reactor demonstrated that the active Ni metal sites do enhance the plasma-catalytic reaction in a similar way as that in conventional catalytic processes. Finally, demonstration of a novel catalysis concept of in situ capture-catalytic system was made for the plasma-assisted catalytic water gas shift reaction. This was investigated in a barium titanate (BaTiO3) packed-bed, non-thermal atmospheric pressure plasma reactor operating at 298 K. The results showed that the packed-bed reactor with CuBTC metal-organic framework (MOF) addition enhanced the CO conversion up to 43%. The comprehensive characterisation of the CuBTC MOF shows that CuBTC MOF exhibited sustainably good physical and chemical stabilities during 4 h long term continuous plasma reaction. The research work in this thesis showed that the BaTiO3 ferroelectric, packed-bed, non-thermal plasma reactor is a potential and powerful environmental solution for CO2 dissociation and other similar pollution treatments with a much higher conversion and energy efficiency at a high specific input energy, more mature and cheaper reactor configuration to scale-up without the need for dielectric barriers. As catalyst introduced into the plasma-assisted process, the demonstrated similar catalytic role of catalytic active sites in plasma-catalytic processes as in conventional thermal catalytic processes opened the gate to apply the catalysts and basic catalytic theories in conventional thermal catalysis field into the non-thermal and atmospheric plasma processes. The boundary of catalysis has been further extended, especially for the non-thermal atmospheric catalytic processes. The catalysis concept for the combination of plasma-catalytic process and conventional thermal catalytic process to enhance the adsorption process of the reactant and then catalyse it simultaneously over the active sites at room temperature and atmospheric pressure could be realised, as demonstrated by using the MOFs with a large gas capture capacity to catalyse water gas shift reaction in non-thermal atmospheric plasma.
44
Chin, Timothy Edward. "Electrochemical to mechanical energy conversion." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/63015.
Abstract:
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2010.Cataloged from PDF version of thesis.
Includes bibliographical references.
Electrode materials for rechargeable lithium ion batteries are well-known to undergo significant dimensional changes during lithium-ion insertion and extraction. In the battery community, this has often been looked upon negatively as a degradation mechanism. However, the crystallographic strains are large enough to warrant investigation for use as actuators. Lithium battery electrode materials lend themselves to two separate types of actuators. On one hand, intercalation oxides and graphite provide moderate strains, on the order of a few percent, with moderate bandwidth (frequency). Lithium intercalation of graphite can achieve actuation energy densities of 6700 kJ m-3 with strains up to 6.7%. Intercalation oxides provide strains on the order of a couple percent, but allow for increased bandwidth. Using a conventional stacked electrode design, a cell consisting of lithium iron phosphate (LiFePO4) and carbon achieved 1.2% strain with a mechanical power output of 1000 W m 3 . Metals, on the other hand, provide colossal strains (hundreds of percent) upon lithium alloying, but do not cycle well. Instead, a self-amplifying device was designed to provide continuous, prolonged, one-way actuation over longer time scales. This was still able to achieve an energy density of 1700 kJ n 3, significantly greater than other actuation technologies such as shape-memory alloys and conducting polymers, with displacements approaching 10 mm from a 1 mm thick disc. Further, by using lithium metal as the counterelectrode in an electrochemical couple, these actuation devices can be selfpowered: mechanical energy and electrical energy can be extracted simultaneously.
by Timothy Edward Chin.
Ph.D.
45
Le, François Josette. "La conversion chez Thomas Merton." Mémoire, Université de Sherbrooke, 2001. http://savoirs.usherbrooke.ca/handle/11143/5193.
Abstract:
Cette recherche visait à approfondir la réalité de la conversion chez Thomas Merton. Je l'ai développée autour de l'hypothèse suivante: la vision de la conversion chez Merton permet de mieux cerner cette réalité, elle en renouvele la saisie pour aujourd'hui. J'espérais ainsi renouveler la façon d'aborder cette réalité centrale de la vie chrétienne. Cinq questions m'ont guidée: Qu'est-ce qui caractérise la conversion chez Merton et la rend nécessaire? Qu'elles en sont les conditions, les obstacles et les fruits? Qu'elle en est la part qui revient à Dieu et à l'humain? J'y ai fait trois découvertes: (1) Merton articule sa réflexion autour de Mc 8 34, (2) il la développe en faisant appel simultanément aux langages de la Bible, de la Tradition monastique, de la vie mystique et de la psycho/psychanalyse, (3) il privilégie la"prière du coeur" comme moyen.
46
Clark, Joanna Helen. "Inorganic materials for energy conversion." Thesis, University of Liverpool, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.569768.
Abstract:
In an effort to design systems that harvest solar light and convert this into chemical energy, the primary aim of the work presented in this thesis was to develop complex metal oxide materials that were active photocatalysts under visible light. The existing methods for visible light incorporation into photocatalytically active materials are reviewed. Of these, metal to metal charge transfer (MMCT) between bimetallic surface- grafted assemblies was taken as particular inspiration. It was hypothesised that MMCT between metal centres within a bulk complex metal oxide could be similarly applied to yield photocatalytic ally active charge carriers. This approach takes advantage of the stability of bulk systems and the ability to tune the compositions of complex oxide materials. Moreover, it was proposed that MMCT between metal centres located on crystallographically distinct sites of a bulk material would aid charge separation and migration throughout the extended lattice. The optical properties of the RE2 Ti207 (RE = Y, La, Ce, Pr) and Ba2XTizM3015 (X = La, Ce, Pr, Nd, Bi; M = Nb, Ta) series, which include some novel cerium(III) titanates, revealed systematic changes in the electronic structures of these materials. These were rationalised with respect to the energy of Ln 4f states. The proposed electronic structures present the partial achievement of the bulk MMCT hypothesis, with optical transitions from occupied Ce 4f midgap states to the unoccupied primarily Ti 3d conduction band. These Ce3+ /rr" charge transfer materials were inactive photocatalysts, attributed to the presence the Ce 4f-based midgap states that facilitate charge recombination. The double perovskite CaCu3T40IZ, with A-site Cu2+ and B-site Ti4+ cations and whose dielectric properties have been studied extensively in the past, is an ideal candidate for the two site MMCT strategy. Here, the optical and photocatalytic properties, rationalised with the aid of DFT calculations, present the partial achievement of the bulk MMCT hypothesis. Sol-gel derived Pt-CaCu3 Ti4012 is an active photocatalyst toward the visible light photo-oxidation of model pollutants methyl orange (MO) and 4-chlorophenol (4CP). Optical spectra and product analysis show that these reactions proceed via more selective routes than the typical reaction over TiOz P25 under DV light. Interestingly, the products of 4CP photo-oxidation were shown to be dependent on the wavelength of incident light. Cu-doping of BizTiz07 was found to stabilise the pyrochlore structure with respect to the Aurivillius phase Bi4 Ti3012 and to impart significant visible light absorption. Sol-gel derived Pt-BiI.6Cuo.4 Tiz07 photo-oxidised MO under visible light via conventional band gap excitation, as determined by quantum efficiency measurements. In contrast, sol-gel derived Pt-B4 Ti3012 photo-oxidised MO via the excitation of adsorbed MO, and was also active toward 4CP photo-oxidation under visible light. The excitation method, mechanisms and product distributions have been investigated for each of the photo-oxidation reactions presented in this thesis. In particular, the photo- oxidation of MO over some Pt-modified metal oxides has been shown to proceed via excitation of adsorbed MO and not of the semiconductor. Additionally, the mechanism and products of these processes are far more selective than the related DV reactions over TiOz P25, and have been shown to depend to some extent on the semiconductor support.
47
de, Albuquerque Fragoso Danielle Munick. "Lignin conversion to fine chemicals." Thesis, University of Glasgow, 2018. http://theses.gla.ac.uk/30847/.
Abstract:
The large availability of Kraft lignin as an industrial by-product and its polyaromatic characteristic, is ideal to consider the potential for recycling it into fine chemicals. To depolymerise lignin, solvolysis and hydrogenolysis experiments were performed. This research considered whether the low yields of products (fine chemicals) were related to the low content of β-O-4 bonds or if it was also associated to the dissolution of lignin in the solvent solution employed in the reactions. The type of solvents chosen to check the dissolution effect were those with low cost and were more sustainable than traditional solvents. Water, ethanol, isopropanol (IPA) and acetone were used. The water mixtures were applied in the tests in various proportions (25:75, 50:50, 75:25 solvent/water v:v). Due to their ability to break C-C and C-O bonds in lignin model compounds [1][2], the efficiency of platinum and rhodium in these reactions supported on alumina was also studied. It was found that the non-catalysed (solvolysis) and catalysed reactions showed different selectivities but similar overall yields ~ 10 % wt of monomeric phenols. The difficulty in increasing yields was mainly associated with the highly condensed character of Kraft lignin and re-polymerisation issues. To achieve an understanding of Kraft lignin depolymerisation, isotopic labelling reactions were completed in the presence of deuterated solvents as well as deuterium gas. This gave information on how Kraft lignin depolymerises, the influence of solvent to products formation and the involvement of hydrogen in the rate determining steps in the reactions. These results have led to an initial mechanistic understanding on how this complex molecule may yield alky-phenolic compounds. It was revealed that the solvent was directly involved in the products’ formation and that they were not generated by simple thermolysis. In addition, the presence of catalysts and hydrogen influenced product formation. The compounds showed different kinetic isotopic values, suggesting that each of these molecules came from individual mechanisms, highlighting the complexity of their formation. This was a relevant study as most of lignin depolymerisation mechanistic insights are based on model compounds and not on lignin itself. It was of interest to this project to explore not only different catalysts and their relationship to lignin depolymerisation, but also different lignin types. A simple pre-treatment for lignin extraction using sawdust (from oak and birch wood) in a Parr autoclave reactor in the presence of hydrogen, solvent and high temperature was developed. The lignins obtained after the pre-treatment were named parr-lignin and successfully resulted in polyaromatic molecules with less condensed character compared to lignins from Soda or Kraft pulping. Reactions were carried out with these lignins and a sugar-cane lignin. 4 5 Different catalytic systems with these lignins were investigated and how depolymerisation was affected by the metal and support used. The catalysts involved in the reactions included platinum, rhodium, nickel and iron. Various supports such as alumina, zirconia and carbon were tested along with the metals described. It was found that the supports were not inert in these experiments presenting catalytic activity. Materials with low surface area (zirconium catalysts) gave a poor performance compared to the others. In addition, nickel, a non-noble metal, showed as good a catalytic effect in the depolymerisation of these lignins as Pt and Rh. The components in the system influenced the reactions to different extents, especially product distribution. The catalysts had different selectivities and the solvents were not only dissolving lignin but also influencing the results. GPC analysis was performed to give an overview of the condensed level of these lignins and degrees of depolymerisation compared to the original material. GC-MS enabled the identification and quantification of 18 monomeric compounds. The post reaction characterisation of selected alumina catalysts (Pt/Al2O3, Ni/Al2O3 and Al2O3) was performed using XRD, BET, CHN, TPO and Raman Analysis to study the nature of the carbonaceous layer deposited on these materials. The work showed that after reaction the catalysts turned black in colour and the carbon laydown consisted of not only one simple type of carbon, and included graphitic species. The amount of carbon deposited depended on the type of lignin. Oak and birch parr-lignins had the highest and lowest amount of carbon over the catalysts respectively. No obvious trend relating to the type of catalyst, lignin and solvent used to the carbon nature was identified. This work showed that lignins with less condensed nature were less susceptible to solvolysis and more to hydrogenolysis. For example, sugar-cane lignin gave 3.9% of phenolic compounds in the solvolysis while reaction with Rh/Al2O3 gave 12.9% of products. This indicated that more selective cleavage of bonds were promoted by heterogenous catalysts. The results suggested that some compounds were mainly generated via dealkylation and hydrodeoxygenation, allowing a future possibility to generate target molecules. These results were mainly due to the presence of more labile bonds, vulnerable to hydrogenolysis. Highlighting that prior to depolymerisation, the pre-treatment used to extract lignin must be appropriate to avoid depletion of the alkyl-aryl ether bonds (β-O-4 bonds, especially) relevant for fine chemicals generation.
48
Costa, Bárbara Reis da. "Cash conversion cycle across industries." Master's thesis, NSBE - UNL, 2014. http://hdl.handle.net/10362/11731.
Abstract:
A Work Project, presented as part of the requirements for the Award of a Masters Degree in Management from the NOVA – School of Business and EconomicsThe purpose of this research is to assess whether Cash Conversion Cycle differs between industries via their components, namely Days Inventory Outstanding, Days Sales Outstanding and Days Payables Outstanding. Based on a sample of multinational companies from two different industries, Fast Moving Consumer Goods and Airline industry for the period 2009-2012, the results suggest that Cash Conversion Cycle differs between industries. Also it differs between large and smaller companies due to different accounting choices. It contributes to a better understanding about how size of the firm, inventory system, liquidity and payables impact on CCC and consequently on companies’ profitability.
49
Woods, Anna Maria. "Mode conversion of plasma waves." Thesis, University of St Andrews, 1987. http://hdl.handle.net/10023/13965.
Abstract:
Linear mode conversion processes are much studied in plasma physics because they determine the efficiency of any radio frequency heating scheme. Mode coupling model equations, extracted with varying degrees of rigour from the Maxwell-linearized kinetic equations, are usually fourth or higher order O.D.E's. These are solved by complicated methods to obtain transmission, conversion, reflection and absorption coefficients. Recently, Fuchs et al and Cairns and Lashmore-Davies (C.L-D.) have postulated second order O.D.E's to describe pairwise coupling events. The second order theories have reproduced results previously obtained by much more sophisticated treatments. In this thesis, we firstly examine the hybrid resonances in a cold plasma and show that they have a mode conversion interpretation in the framework of the C.L-D. model. The Budden tunnelling coefficients are recovered for this case. Next, mode conversion between the fast and slow electromagnetic waves in the lower hybrid frequency range is considered. This phenomenon determines the accessibility of the lower hybrid resonance to the slow wave, and is also of theoretical interest because the mode coupling differs in certain aspects from cases previously investigated by C.L-D. A second order approximation to the dispersion relation is used in the mode conversion region leading to Weber's equation from which transmission coefficients are then obtained in various cases. Finally, we provide justification for the use of Weber's equation. The exact fourth order system of O.D.E's for the problem is set down, and a linear transformation, which is an extension of that given by Heading, reveals the second order nature of the coupling process. Numerical solutions of the fourth order system yield transmission coefficients in excellent agreement with the second order theory, and also demonstrate that the electric field variation across the mode conversion region is well approximated, via the above transformation, by our second order theory.
50
Nunna, Raghavendra. "Novel chalcogenides for thermoelectric conversion." Caen, 2013. http://www.theses.fr/2013CAEN2078.
Abstract:
Ce travail de thèse porte sur la synthèse et la caractérisation de nouveaux chalcogénures à propriétés thermoélectriques. Deux familles de matériaux ont été étudiées : les composés à structure pseudo-Hollandite et les composés en couches de type CdI2. Dans ces premiers, les études se sont principalement portées sur les structures à base de thallium de formulation TlxCr5Se8 and TlCr5Se8-xTex. L’influence de la non stoichiometrie en Tl ainsi que de la solution solide Sélénium-Tellure sur les propriétés électriques et thermiques a principalement été abordée. Pour les composés de structure de base CdI2, une étude systématique de substitution et intercalation chimique a été menée. Les meilleurs résultats sont rapportés dans le composé Cu0. 05TiS1. 5Se0. 5 avec une valeur de ZT de 0. 54 à 700K. D’une manière générale, ce travail de thèse démontre l’importance de la formulation chimique sur les propriétés électriques (Taux de porteurs) mais aussi sur la contribution phonique à la conductivité thermique (désordre structural). Ces résultats encourageant ont ouverts une voie dans la recherche de nouveaux matériaux thermoélectriques, notamment à base de chalcogénes, pour des utilisations futures dans des applications thermoélectriques. Ce travail démontre également que la recherche fondamentale de nouveaux composés et de nouvelles structures peut toujours permettre la découverte de matériaux aux propriétés intéressantesThe focus of this thesis work is the exploratory preparation of novel chalcogenides as potential thermoelectric materials and the analyses of their physical properties. A thermoelectric material is capable of converting heat to electricity or vice versa. Usually, narrow band gap semiconductors are good candidates for thermoelectric applications, because such materials have large Seebeck coefficient, reasonably high electrical conductivity and low thermal conductivity. In this work, two different systems were studied, intermetallic pseudo hollandite structures and layered CdI2 type structures. In the large family of pseudo hollandite systems, we mainly focused on thallium systems in which the solid solution TlxCr5Se8 and TlCr5Se8-xTex have been synthesized. In CdI2 structures, we focused our investigation on transition metal selenides for their rather semiconducting properties. Therefore we embarked on the systematic study of AgCrSe2, TiS2 and TiSe2. In addition, the effect on physical properties using different intercalated elements (Ag and Cu) in TiSe2 chalcogenides were studied. All these samples are prepared by the solid state reaction. The purity of the samples was confirmed by powder X-ray diffraction data, physical and thermal properties were measured on Spark Plasma Sintered (SPS) samples. Low thermal conductivity as well as competitive power factors was observed in these chalcogenides. The highest zT of 0. 54 is achieved in titanium dichalcogenides for the composition of Cu0. 05TiS1. 5Se0. 5 at 700K. Our results show that these structures are potential for future thermoelectric materials research