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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.
191

Modeling of experimental studies of fluid and particle transport in porous media

Härlin Lennermark, Mikael January 2009 (has links)
<p>To extract metals and increase the pH value of water around a historical mine waste deposit a series of barrels are used. Polluted water is forced to pass inside these barrels where different filter materials purify the water. This research project is carried out in Sweden by MTM at Örebro University and Bergkraft in Kopparberg, titled “Methods for characterisation and remediation of historical mine waste”.</p><p> </p><p>The fluid flow trough the filter materials in the barrels are needed to be understood, in order to improve the extracting process.</p><p> </p><p>In this work a small transparent model filled with sand was made to visualise the fluid flow. In that model coloured water is representing the polluted water. To describe the flow in the transparent model a mathematical model is presented. The theory used in this work is the complex variable method in fluid dynamics together with numerical methods and computer programming. There is a pretty good match between the theoretical and experimental results presented in two dimensions. Continuing work could result in a three dimensional model with different geometries using the same technique.</p>
192

The Kodály Method and Tonal Harmony: An Issue of Post-secondary Pedagogical Compatibility

Penny, Lori Lynn 31 July 2012 (has links)
This study explores the topic of music theory pedagogy in conjunction with the Kodály concept of music education and its North-American adaptation by Lois Choksy. It investigates the compatibility of the Kodály Method with post-secondary instruction in tonal harmony, using a theoretical framework derived from Kodály’s methodology and implemented as a teaching strategy for the dominant-seventh chord. The customary presentation of this concept is authenticated with an empirical case study involving four university professors. Subsequently, Kodály’s four-step instructional process informs a comparative analysis of five university-level textbooks that evaluates the sequential placement of V7, examines the procedure by which it is presented, and considers the inclusion of correlated musical excerpts. Although divergent from traditional approaches to tonal harmony, Kodály’s principles and practices are pedagogically effective. By progressing from concrete to abstract, preceding symbolization with extensive musical experience, conceptual understandings are not only intellectualized, but are developed and internalized.
193

Etude d'estimations d'erreur a posteriori et d'adaptivité basée sur des critères d'arrêt et raffinement de maillages pour des problèmes d'écoulements multiphasiques et thermiques. Application aux procédés de récupération assistée d'huile

Yousef, Soleiman 10 December 2013 (has links) (PDF)
L'objectif de cette thèse est l'analyse d'erreur a posteriori et la proposition de stratégies d'adaptivité basées sur des critères d'arrêt et de raffinement local de maillage. Nous traitons une classe d'équations paraboliques dégénér ées multidimensionnelles modélisant des problèmes importants pour l'industrie. Au chapitre 1 nous considérons le problème de Stefan instationaire a deux phases qui modélise un processus de changement de phase régi par la loi de Fourier. Nous régularisons la relation entre l'enthalpie et la température et nous discrétisons le problème par la méthode d'Euler implicite en temps et un schéma numérique conforme en espace tel que les élément finis conformes, ou les volumes finis centrés aux sommets du maillage. Nous démontrons une borne supérieure de la norme duale du résidu, de l'erreur sur l'enthalpie dans L2(0; T;H-1) et de l'erreur sur la température dans L2(0; T;L2), par des estimateurs d'erreur entièrement calculables. Ces estimateurs comprennent : un estimateur associé à l'erreur de régularisation, un estimateur associé à l'erreur d'une méthode de linéarisation (par exemple, la méthode de Newton), un estimateur associé à l'erreur en temps et un estimateur associé à l'erreur du schéma en espace. Par conséquent, ces estimateurs permettent de formuler un algorithme adaptatif de résolution où les erreurs associées peuvent être équilibrées. Nous proposons également une stratégie de raffinement local de maillages. En fin, nous prouvons l'efficacité de nos estimations d'erreur a posteriori. Un test numérique illustre l'efficacité de nos estimateurs et la performance de l'algorithme adaptatif. En particulier, des indices d'efficacité proches de la valeur optimale de 1 sont obtenus. Au chapitre 2 nous développons des estimations d'erreur a posteriori pour l'écoulement de Darcy polyphasique et isothermique, décrit par un système couplé d'équations aux dérivées partielles non linéaires et d'équations algébriques non linéaires. Ce système est discrétisé en espace par une méthode de volume finis centrés par maille et la méthode d'Euler implicite en temps. Nous etablissons une borne supérieure d'une norme duale du résidu augmentée d'un terme qui tiens compte de la non-conformité des volumes finis par des estimateurs d'erreur a posteriori entièrement calculables. Dans ce chapitre, nous nous concentrons sur la formulation d'un critère d'arrêt de l'algorithme de linéarisation du problème discrète (tel que la méthode de Newton) avec un critère d'arrêt du solveur algébrique de résolution du système linéarité (par exemple la méthode GMRes), de sort que les contributions des estimateurs d'erreur correspondant n'affectent plus la somme globale des estimateurs d'erreur de manière significative. Nous appliquons notre analyse sur des exemples réalistes d'ingénierie de réservoir pour confirmer qu'en général notre ajustement des critères d'arrêt apporte une économie significative (jusqu'au un ordre de magnitude en termes du nombre total des itérations du solveur algébrique), déjà sur des maillages fixes, et ceci sans perte notable de précision. Au chapitre 3 nous complétons le modèle décrit au chapitre 2 en considérant une condition non-isothermique pour l'écoulement a fin de traiter le modèle général d'écoulement polyphasique thermique dans les milieux poreux. Pour ce problème, nous développons des estimateurs d'erreur analogues a ceux du chapitre 2 pour lesquels nous établissons une borne supérieure d'erreur entièrement calculable, pour une norme duale du résidu complétée par un terme d'évaluation de la non-conformité. Nous montrons ensuite comment estimer séparément chaque composante d'erreur, ce qui nous permet d'ajuster les critères d'arrêt et d'équilibrer les contributions des différents estimateurs d'erreur : erreur d'approximation en temps, erreur d'approximation en espace, erreur de linéarisation et erreur du solveur algébrique. Ce chapitre se termine par une application des estimateurs au modèle d'huile morte. La preuve de l'efficacité de notre estimation a postiriori est egalement fournie. Finalement, au chapitre 4 nous considérons les procédés de récupération assistée d'huile. Plus précisément, nous étudions une technique de récupération thermique d'huile de type huile morte par injection de vapeur destinée a augmenter la mobilité des hydrocarbures. Dans ce chapitre, nous appliquons l'analyse a posteriori des chapitres 2 et 3, nous proposons une formule de quadrature pour simplifier l'évaluation des estimateurs, nous proposons un algorithme adaptatif de raffinement de maillages en espace et en temps basé sur les estimateurs et nous illustrons pas des essais numériques sur des exemples réalistes la performance de cette stratégie de raffinement. Notamment, des gains significatifs sont réalisés en terme du nombre de mailles nécessaires pour la simulation sur des exemples en dimension trois.
194

Modeling of experimental studies of fluid and particle transport in porous media

Härlin Lennermark, Mikael January 2009 (has links)
To extract metals and increase the pH value of water around a historical mine waste deposit a series of barrels are used. Polluted water is forced to pass inside these barrels where different filter materials purify the water. This research project is carried out in Sweden by MTM at Örebro University and Bergkraft in Kopparberg, titled “Methods for characterisation and remediation of historical mine waste”.   The fluid flow trough the filter materials in the barrels are needed to be understood, in order to improve the extracting process.   In this work a small transparent model filled with sand was made to visualise the fluid flow. In that model coloured water is representing the polluted water. To describe the flow in the transparent model a mathematical model is presented. The theory used in this work is the complex variable method in fluid dynamics together with numerical methods and computer programming. There is a pretty good match between the theoretical and experimental results presented in two dimensions. Continuing work could result in a three dimensional model with different geometries using the same technique.
195

The Kodály Method and Tonal Harmony: An Issue of Post-secondary Pedagogical Compatibility

Penny, Lori Lynn January 2012 (has links)
This study explores the topic of music theory pedagogy in conjunction with the Kodály concept of music education and its North-American adaptation by Lois Choksy. It investigates the compatibility of the Kodály Method with post-secondary instruction in tonal harmony, using a theoretical framework derived from Kodály’s methodology and implemented as a teaching strategy for the dominant-seventh chord. The customary presentation of this concept is authenticated with an empirical case study involving four university professors. Subsequently, Kodály’s four-step instructional process informs a comparative analysis of five university-level textbooks that evaluates the sequential placement of V7, examines the procedure by which it is presented, and considers the inclusion of correlated musical excerpts. Although divergent from traditional approaches to tonal harmony, Kodály’s principles and practices are pedagogically effective. By progressing from concrete to abstract, preceding symbolization with extensive musical experience, conceptual understandings are not only intellectualized, but are developed and internalized.
196

The price you’re worth: A case-study of pricing in the TIC-market

Vinberg, Kasper, Lindstedt, Stefan January 2020 (has links)
How to price your offering is one of the main managerial decision issues today and is alarmingly often not grounded in necessary market and cost research. Pricing is a complex topic, dependent on a multitude of internal and external factors, which makes pricing practice and strategy alignment even more difficult. As a simplifying measure, pricing practices are commonly categorized into three categories: cost-based, competition-based and value-based pricing, of which value-based pricing is considered the superior practice by scholars. Consequently, the issue of how to adopt value-based pricing and how to actually price according to value is pertinent and a main focus of this thesis. What comprises perceived customer value, how a firm creates and captures value, and how a firm chooses to formulate the customer value proposition in order to communicate the generated value are all questions that this thesis investigates and attempts to answer. Furthermore, the effects of the customer-supplier relationship on pricing and change management aspects of a transition to value-based pricing are also investigated and analyzed. In order to answer the research purpose and accompanying research questions, a qualitative single case-study was conducted. The case company was a leading company in the TIC-market, who just recently had started discussing implementing value-based pricing and was therefore deemed as an appropriate case for this study. Empirical data was gathered through semi-structured interviews with the employees as well as the customers of the case company. The analysis of the empirical data in conjunction with the theoretical framework led to a revised analytical model that attempts to explain the relations and correlations of the different concepts discussed in this thesis, as well as conclusions regarding the aforementioned research questions. This study concludes that the common value drivers are Quality, Delivery reliability, Delivery time, Price, Geographical location, Relationship and communication, Customization. Additionally, the study concludes that the alignment of pricing practice and strategy is heavily dependent on internal and external awareness, and it is of utmost importance for a firm engaging in value-based pricing to know not only their customer and market, but also their own capabilities and strengths. Regarding how to formulate the customer value proposition, the study concludes that it should be customized for the specific customer and have a resonating focus with elements of points of difference. Lastly, the study details the challenges that a firm transitioning to a value-based pricing practice might encounter, and the suggestive solutions to these obstacles.
197

Budoucnost svobodná a společná: Spor The Zeitgeist Movement a Freedomain Radio jako konflikt vědeckých paradigmat / Future free and shared: Dispute of The Zeitgeist Movement and Freedomain Radio as a Scientific Paradigm Conflict

Kaleta, Jan January 2016 (has links)
The thesis analyses a dispute of two anarchist movements promoting Anarcho-Capitalism and an automated non-monetary economy. It asks the question whether the dispute can be explained in terms of paradigm conflict and not exclusively in political terms . The goal is to search for signs of scientific paradigm in an apparently ideological dispute. The thesis also examines the reasons why did the debate deteriorate into a personal and moral conflict of the representatives. The method of analysis is Grounded Theory, with reference to authors who interpret Kuhn's paradigm conflict as the consequence of an unconscious language barrier. Paradigm was operationally defined as a hierarchy of concepts with physical reference, theoretical network of the concepts and the scientific field objectives. The field objectives are the only reliable reference points between paradigms. The thesis sums up the debate between Anarcho-Capitalists and proponents of Resource-Based Economy and recovers the scientific answers and field objectives which were demanded yet missing in the debate. The thesis concludes that the debate can legitimately continue and that the ideological differences were mostly caused by a different scope of technical instruments and their describing paradigms, regardless of historical origin and...
198

Undoing Gender

Geimer, Alexander 25 April 2017 (has links)
Stefan Hirschauer kritisiert mit dem Konzept des Undoing Gender den Theorieentwurf des Doing Gender nach West & Zimmerman. Er begreift Geschlecht als Effekt von Interaktionen und lehnt sich dabei an Garfinkels ethnomethodologisches Konzept der Accountability und der Omnirelevanz von Geschlecht an. Aus institutioneller Perspektive wird die Möglichkeit der Neutralisierung der Kategorie Geschlecht betont. Forschungsperspektivisch ist Geschlecht auf seine konkrete Relevanzsetzung in Interaktionen unter der Bedingung unterschiedlicher kultureller Konfigurationen und institutioneller Arrangements zu untersuchen ('kontextuelle Kontingenz').
199

A Descriptive Analysis of the Oberammergau Passion Play 2010

Wolf, Christa J. 20 September 2013 (has links)
No description available.
200

Das bedingte Selbst / Familie, Identität und Geschichte im zeitgenössischen Generationenroman / The Conditioned Self / Family, Identity and History in Contemporary Generationel Novels

Neuschäfer, Markus 23 May 2012 (has links)
No description available.

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