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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
21

Computational Prediction of Flow and Aerodynamic Characteristics for an Elliptic Airfoil at Low Reynolds Number

Chitta, Varun 11 August 2012 (has links)
Lifting surfaces of unmanned aerial vehicles (UAV) are often operated in low Reynolds number (Re) ranges, wherein the transition of boundary layer from laminar-to-turbulent plays a more significant role than in high-Re aerodynamics applications. This poses a challenge for traditional computational fluid dynamics (CFD) simulations, since typical modeling approaches assume either fully laminar or fully turbulent flow. In particular, the boundary layer state must be accurately predicted to successfully determine the separation behavior which significantly influences the aerodynamic characteristics of the airfoil. Reynolds-averaged Navier-Stokes (RANS) based CFD simulations of an elliptic airfoil are performed for time-varying angles of attack, and results are used to elucidate relevant flow physics and aerodynamic data for an elliptic airfoil under realistic operating conditions. Results are also used to evaluate the performance of several different RANS-based turbulence modeling approaches for this class of flowfield.
22

Zobrazení politického Východu v karikatuře ve francouzském časopise Le Canard enchaîné v období 1945-1970 / Picture of the political East in the caricature in the French magazine Le Cannard enchîné in 1945-1970

Walsh, Diana January 2017 (has links)
This diploma thesis focuses on the analysis of caricatures with a theme of the Eastern block in French satirical weekly magazine Le Canard enchaîné in 1945-1970. By the Eastern block, we understand the Soviet Union and its associated socialistic countries. The thesis is anchored in the theoretical part by historical context of the history of the eastern countries, as well as by the development of analysed weekly magazine on the background of the history of France, by the formulation of the concepts of caricature and satire, including important authors, and the research methods themselves. Triangulation, in this case the combination of quantitative content analysis and semiotic analysis, aims to analyse individual caricatures with the theme of the East and its individual countries. The analysed periods are divided into two sections, due to the availability of materials, namely 1945-1948 and 1968-1970.
23

La disparition de la rencontre de marché dans la tradition économique française : de Boisguilbert à Walras / The disappearance of the encounter of market in the French economic tradition : from Boisguilbert to Walras

Bruneau, Laurent 16 December 2010 (has links)
La thèse se propose de réexaminer le concept de concurrence dans une sélection de textes classiques de la tradition économique française du 18ème siècle et du 19ème siècle.L’examen des textes fondateurs de Boisguilbert et de Cantillon, montre que le concept de concurrence recouvre deux contenus différents.- D’une part, la concurrence qui s’exerce sur un site de marché, du côté long du marché, et qui prend la forme d’un comportement conflictuel de rabais ou d’enchères monétaires.- D’autre part, la concurrence qui s’exerce ensuite à partir des signaux prix constitués sur le site de marché, et qui prend la forme de décisions quantitatives, de réallocations des marchandises, des capitaux et des hommes. Cette deuxième signification va peu à peu supplanter la première jusqu’à faire disparaître le concept même de rencontre de marché, notamment dans l’œuvre de Turgot (avec le marché général). Cette même tendance apparaît dans l’analyse mathématique d’Isnard, alors même que Canard propose une approche mathématique de la rencontre conflictuelle de marché.Au début du 19ème siècle, influencé par Smith modifiant la définition de la demande, Say confirme la disparition, tandis que Sismondi ne parvient pas à dissocier les processus concurrentiels.Par la suite, les auteurs de l’école française, au premier rang desquels Garnier et Molinari vont alors parachever le processus d’occultation des processus concurrentiels du premier type, malgré la tentative iconoclaste de Walras qui tente, sans succès selon nous, d’en rendre compte avec le tâtonnement. Au final, la recherche montre que l’absence de prise de conscience de la dualité du concept de concurrence, a rendu invisible le changement de direction de l’analyse de la rencontre de marché, vers 1760. Une reconnaissance de cette dualité pourrait donc réorienter efficacement les recherches contemporaines. / The thesis offers to re-examine the concept of competition in a selection of traditional texts of the French economic tradition of the 18th and 19th century.The examination of the founding texts of Boisguilbert and Cantillon, shows that the concept of competition covers two different contents.- On the one hand, the competition which is exerted on the site of a marketplace, on the long side of the marketplace, and which takes the form of conflictual behavior of outbidding or underbidding price.- On the other hand, the competition which is exerted from indications of price signal on the site of marketplace, and which takes the form of quantitative decisions, of réallocations of the goods, capital and men. This second significance gradually will supplant the first, until it made disappear the concept itself of encounter of market, in particular in the work of Turgot (with the general market). This same tendency appears in the mathematical analysis of Isnard, while at the same time Canard introduces a mathematical approach of the conflictual encounter of market.At the beginning of the 19th century, influenced by Smith amending the definition of the demand, Say confirms this disappearance, while Sismondi does not manage to dissociate the competitive processes. Thereafter, the authors of the French school, first and foremost Garnier and Molinari are then going to complete the blanking process of the competitive behaviour of the first type, in spite of the iconoclastic attempt of Walras which tries, unsuccessfully according to us, to give an account of it, with the concept of tâtonnement (groping).Finally, research shows that the absence of awareness of the duality of the concept of competition, made invisible the change of direction in the analysis of the encounter of market, in about 1760. A recognition of this duality could thus successfully reorientate contemporary research.
24

Fauxtopia

Kampf, Raymond William 01 January 2004 (has links)
To all who come to this fictitious place:Welcome.Fauxtopia is your land. Here, age relives distorted memories of the past, and here, youth may savor the challenge of trying to understand the present. Fauxtopia is made up of the ideals, the dreams and the fuzzy facts which have re-created reality... with the hope that it will be a source of edutainment for all the world.Ray KampfFauxtopia DedicationApril 1st, 2004

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