The diploma thesis studies the elaboration of project about thermal solar systém for all- season service. System is used for heating of outdoor pool and in the winter season for the heating of nearby garage in the village Lipůvka. The aim of the work was to make a proportioning, choosing the right parts and calculating the economic and ecologic balance.

The aim and objective of this research is to formulate and solve a multi-objective optimization problem for the optimal placement of multiple rows and multiple columns of fixed flat-plate solar collectors in a field. This is to maximize energy collected from the solar collectors and minimize the investment in terms of the field and collector cost. The resulting multi-objective optimization problem will be solved using genetic algorithm techniques. It is necessary to consider multiple columns of collectors as this can result in obtaining higher amounts of energy from these collectors when costs and maintenance or replacement of damaged parts are concerned. The formulation of such a problem is dependent on several factors, which include shading of collectors, inclination of collectors, distance between the collectors, latitude of location and the global solar radiation (direct beam and diffuse components). This leads to a multi-objective optimization problem. These kind of problems arise often in nature and can be difficult to solve. However the use of evolutionary algorithm techniques has proven effective in solving these kind of problems. Optimizing the distance between the collector rows, the distance between the collector columns and the collector inclination angle, can increase the amount of energy collected from a field of solar collectors thereby maximizing profit and improving return on investment. In this research, the multi-objective optimization problem is solved using two optimization approaches based on genetic algorithms. The first approach is the weighted sum approach where the multi-objective problem is simplified into a single objective optimization problem while the second approach is finding the Pareto front. / Dissertation (MEng)--University of Pretoria, 2012. / Electrical, Electronic and Computer Engineering / MEng / Unrestricted

This dissertation examines the early history of the Berliner Phonogramm-Archiv (Berlin Phonogram Archive) and its role in the institutionalization of comparative musicology. The Berliner Phonogramm-Archiv was established in 1900 by psychologist Carl Stumpf in order to collect and preserve the phonographic recordings of non-European musics that would serve as the primary research materials for the then nascent discipline of comparative musicology. I situate the formation of the Phonogramm-Archiv and the emergence of comparative musicology within the historical contexts of the German cultural sciences and colonialism, and argue that both archive and discipline were informed as much by this immediate intellectual and political background as they were by the arrival of sound recording technologies in Germany. I explore how the other cultural sciences, primarily anthropology and ethnology, served as a model for comparative musicology’s methodological and epistemological framework, as well as for the strategies employed for expanding the Phonogramm-Archiv’s collection. As a cultural science, comparative musicology was governed by the tenet of scientific objectivity, and in sound recording, Stumpf found a means with which it was possible to engage with non-European musics objectively. Yet the scientific method also required the comparison of many different examples in order to determine laws through induction, which necessitated the collection of recordings of as many different musics as possible. In this dissertation, I demonstrate how the Phonogramm-Archiv’s mission to amass recordings and the comparative musicological project these recordings facilitated were both enabled by and dependent on the German colonial apparatus.

In this study a roof-top PVT/absorption chiller system is modeled for a hotel building in Antalya, Turkey to cover the cooling demand of the hotel, to produce electricity and domestic hot water. PVT modules, an absorption chiller, a hot storage tank and a natural gas fired auxiliary heater are the main components of the system. Elecetrical power produced by the system is 94.2 MWh, the cooling power is 185.5 MWh and the amount of domestic hot water produced in the system is 65135 m3 at 45 0C annually.  Even though the systems is capable of meeting the demands of the hotel building, because of the high investment costs of PVT modules and high interest rates in Turkey, it is not economically favorable. Using cheaper solar collectors, integrating a cold storage unit in the system or having an improved conrol strategy are the options to increase the system efficiency and to make the system economically competitive.

Indiana University-Purdue University Indianapolis (IUPUI) / This thesis reevaluates the role that women played in the collection and patronage of natural history, fine arts and antiquities in the long eighteenth century. While most scholarship that addresses early modern collecting and patronage operates within an androcentric framework, this project fills a historiographical gap by focusing its analyses on the experiences, activities, contributions, and achievements of female figures. Primary documentation provides evidence of a highly sophisticated, invested and functional network of enthusiastic and experienced female collectors and patrons who participated in activities that were at once parallel to that of their male peers and yet retained a distinctly feminine character. Influenced by prevailing intellectual movements and aesthetic trends, women throughout the period studied, accumulated, and commissioned items of scientific, artistic, and antiquarian value. Their meaningful engagement with naturalists, explorers, artists, statesmen, and colleagues is at the center of this study which situates female collectors and patrons within a wider socio-cultural context and confirms the broader historical significance of their work. In this way, this thesis may be understood as a restoration of women to their central place in the history of collecting and patronage and as a more complete historicization of the corresponding culture between the years 1715 and 1825.

This dissertation addresses the flow control problem in hyperbolic heat transfer mechanisms. It raises in concentrated distributed solar collectors to enhance their production efficiency under the unpredictable variations of the solar energy and the external disturbances. These factors which are either locally measured (the solar irradiance) or inaccessible for measurement (the collectors’ cleanliness) affect the source term of the distributed model and represent a major difficulty for the control design. Moreover, the temperature in the collector can only be measured at the boundaries. In this dissertation, we propose new adaptive control approaches to provide the adequate level of heat while coping with the unpredictable varying disturbances. First, we design model based control strategies for a better efficiency, in terms of accuracy and response time, with a relatively reduced complexity. Second, we enhance the controllers with on-line adaptation laws to continuously update the efficient value of the external conditions. In this study, we approach the control problem using both, the infinite dimensional model (late lumping) and a finite dimensional approximate representation (early lumping). For the early lumping approach, we introduce a new reduced order bilinear approximate model for system analysis and control design. This approximate state representation is then used to derive a nonlinear state feedback resorting to Lyapunov stability theory. To compensate for the external disturbances and the approximation uncertainties, an adaptive controller is developed based on a phenomenological representation of the system dynamics. For the late lumping approach, we propose two PDE based controllers by stabilization of the reference tracking error distributed profile. The control laws are explicitly defined as functions of the available measurement. The first one is obtained using a direct approach for error stabilization while the second one is derived through a nonlinear mapping. Furthermore, we endow the nonlinear controllers with an adaptation law to cope with the unpredictable unmeasured disturbances. The proposed adaptation law is based on a Proportional plus Integral correction feedback. We show that the control objectives with the required performance can be achieved following both approaches, but yet are conditioned with the physical limitations of the system.

The diploma thesis studies the elaboration of project about thermal solar systém for all- season service. The aim of the work was to make a proportioning, choosing the right parts and calculating the economic and ecologic balance.

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This dissertation examines portrait production during the global Gilded Age in the United States, revealing an interplay between cosmopolitanism and revivalism. Using a transnational and multi-media framework, it broadens conventional definitions of portraiture, allowing American women to be centered within the study not only as subjects, but also as patrons of art. The project demonstrates that the apparently anti-modern strain of revivalism characteristic of late nineteenth century art emerged as a reflection of US expansionist ideologies. This goal is accomplished through a series of illustrative case studies, including a discussion of Gilded Age costume balls, organized by wealthy American women, that visualized the imperial courts of pre-industrial Europe in order to legitimize their social positions. Another investigation considers the Paris studio contents of American painter John Singer Sargent, which brought his iconic painting Madame X into exhibitionary dialogue with collected Japanese export goods, as emblems of the artist’s cosmopolitan brand of empire. An analysis of society leader Alva Vanderbilt’s Pompadour bedroom by French designer Jules Allard reveals a blend of pre-industrial style produced with modern technologies, making it a space worthy of her imperial ambitions. Finally, the study examines society matriarch Alice Vanderbilt’s paradoxical Victorianism and Modernism in the context of her portrait collection. Overall, the project illuminates new definitions of cosmopolitanism and its cultural significance during the Gilded Age and considers the collaboration between female patrons and artists, placing them within the context of media circulation and a global art market where women could curate and claim their own brand of identity, one expressive of a global reaching American empire in the late nineteenth-century. / Art History

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