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Inhalt dieser Arbeit ist die Design-Studie für einen kompakten Niederenergie-Elektronenspeicherring für die Radiometrie. Im Ring sollen Elektronen mit Energien im Bereich von 200 MeV bis 600 MeV gespeichert werden können, wobei die Emittanz möglichst klein und die Strahllebensdauer über den gesamten Energiebereich bei einem Strom von 100 mA mindestens eine Stunde sein sollten.Diese Vorgaben wurden in Abstimmung mit einem der potentiellen Hauptnutzer, der Physikalisch-Technische Bundesanstalt (PTB), festgelegt und sollen den Speicherring zu einer optimalen Synchrotronstrahlungsquelle für die Radiometrie im ultravioletten und vakuumultravioletten Spektralbereich mit Photonenenergien zwischen etwa 5 eV und 200 eV machen. Im Rahmen dieser Arbeit werden die aus physikalischer Sicht wichtigsten Teilsysteme eines Speicherringes konzeptioniert: Magnetoptik, Hochfrequenz-, Vakuum-, Diagnose- und Injektionssystem sowie die Magnetauslegung. Außerdem werden die zu erwartenden Synchrotronstrahlungsspektren berechnet. Der entworfene Speicherring hat einen Umfang von 34.2 m und besteht aus zwei "Triple Bend Achromat"-Bögen, die durch gerade Strecken miteinander verbunden sind. In eine dieser geraden Strecken kann ein maximal 5.6 m langes "Insertion Device" eingebaut werden, die andere ist durch die Injektionselemente und das Hochfrequenz-Cavity belegt. Insgesamt können mit dem Design des hier vorgestellten Speicherringes alle gestellten Anforderungen erfüllt werden: die natürliche Emittanz ist vergleichsweise niedrig und liegt bei günstigen linearen und nichtlinearen Eigenschaften der Magnetoptik nah an ihrem minimal möglichen Wert. Mit der gewählten Auslegung von Magnetoptik, Hochfrequenz- und Vakuumsystem beträgt die Strahllebensdauer mit einem Speicherringstrom von 100 mA bei niedrigen Elektronenenergien zwischen (200...300)MeV etwas über eine Stunde und steigt auf mehr als sechs Stunden bei der Maximalenergie von 600 MeV. Die Strahllebensdauer übertrifft damit im gesamten Energiebereich die Vorgabe. / The subject of this work is the preparation of a design study for a compact low energy electron storage ring for radiometry in the ultraviolet and vacuum ultraviolet spectral range. Electrons with energies between 200 MeV and 600 MeV are to be stored. A small natural emittance is desired and the lifetime of a stored electron beam of 100 mA should not be less than one hour in the considered energy range. These major guidelines have been fixed in cooperation with one of the potential main users, the Physikalisch Technische Bundesanstalt (PTB), to optimize the storage ring for radiometric applications in the ultraviolet and vacuum ultraviolet spectral range with photon energies from approximately 5 eV to 200 eV. In this work the physical layout for the most important subsystems is given: magnet optics, rf-, vacuum-, diagnostic and injection system as well as the main magnet design. Additionally the expected synchrotron radiation spectra are calculated. The storage ring has a circumference of 34.2 m and consists of two Triple Bend Achromat cells, connected by two long straight sections. In one of these straight sections a 5.6 m long insertion device can be build in. The other one is occupied by the injection elements and the rf-cavity. All aspired guidelines are feasible with the presented storage ring design: the natural emittance is comparably small and with good linear and nonlinear optical properties close to its minimum value. With the presented solution (magnet optics, rf- and vacuum-system) the electron beam lifetime with 100 mA ring current is slightly above one hour at energies between (200...300) MeV and increases to more than 6 hours at the maximum energy of 600 MeV. Thus beam lifetime exceeds the guidelines at all energies.

published_or_final_version / Education / Master / Master of Education

published_or_final_version / Education / Master / Master of Education

published_or_final_version / Education / Master / Master of Education

This study develops and applies a conceptual framework that can be used to evaluate dynamic Web platforms in order to determine a platform for teaching Web application development in tertiary institutions. The framework is specific, yet comprehensive and supported with theory and empirical experimental programming results. We first identify the concepts of Web application development and the constraints to be satisfied by a platform for teaching identified concepts. Then we establish various criteria that will enhance the teaching of the concepts. We also establish qualities and experiment that will ensure that a selected platform is easy to use, fast, portable and affordable. A spreadsheet tool is developed to apply the framework and enable users to customize the framework by varying the criteria's weights. The developed framework is tested by the evaluation of the suitability of Java Servlets, JSP, ASP and PHP with PHP emerging as a suitable platform. / Computing / M.Sc. (Information Systems)

Integrated Circuits (ICs) have a broad range of applications in healthcare, military, consumer electronics etc. The acronym VLSI stands for Very Large Scale Integration and is a process of making ICs by placing millions of transistors on a single chip. Because of advancements in VLSI design technologies, ICs are getting smaller, faster in speed and more efficient, making personal devices handy, and with more features. In this thesis work an interactive framework is designed in which the fundamental concepts of digital logic design and VLSI design such as logic gates, MOS transistors, combinational and sequential logic circuits, and memory are presented in a simple, interactive and user friendly way to create interest in students towards engineering fields, especially Electrical Engineering and Computer Engineering. Most of the concepts are explained in this framework by taking the examples which we see in our daily lives. Some of the critical design concerns such as power and performance are presented in an interactive way to make sure that students can understand these significant concepts in an easy and user friendly way.

University of Macau / Faculty of Social Sciences and Humanities / Department of English

This study develops and applies a conceptual framework that can be used to evaluate dynamic Web platforms in order to determine a platform for teaching Web application development in tertiary institutions. The framework is specific, yet comprehensive and supported with theory and empirical experimental programming results. We first identify the concepts of Web application development and the constraints to be satisfied by a platform for teaching identified concepts. Then we establish various criteria that will enhance the teaching of the concepts. We also establish qualities and experiment that will ensure that a selected platform is easy to use, fast, portable and affordable. A spreadsheet tool is developed to apply the framework and enable users to customize the framework by varying the criteria's weights. The developed framework is tested by the evaluation of the suitability of Java Servlets, JSP, ASP and PHP with PHP emerging as a suitable platform. / Computing / M.Sc. (Information Systems)

Certain disjunctions exist between the structure, courses, and practices of current textile curricula on the one hand, and the demands of students for entry into diverse creative professions and the demands of the creative industry for qualified new talents on the other. Thus, this research will explore the history, current issues, and emerging trends of academia and the creative professions as these shape the qualifications, aspirations, and expectations of students, academia, and the textile-related fields. The ultimate goal of this study is to comprehend the contemporary issues—social, economic, and cultural shifts—that may impact textile education within art and design colleges, and propose an efficient and engaging BFA (Bachelor of Fine Arts) textile curriculum suitable for the era of interdisciplinary education and the fourth industrial revolution. Since scholarly study of the effectiveness of art school curriculum is limited and little research has examined the challenges of BFA education, and in particular BFA textile education in the context of 21st century college education, the researcher begins with a survey of existing literature from adjacent fields, including higher education, sociology, business, marketing, apparel, and art education, in particular, adolescent artistic development. The existing literature also includes statistics from government, consulting firms, colleges ranking sites, and annual reports published by each school. This qualitative case study examines how stakeholders in BFA textile education—students, faculty, and professionals—from five selected art colleges in the U.S. perceive their educational experiences and post-college careers. The data were collected through 1) a review of existing literature pertaining to perspectives of general college education, creative industry, and current student generation, and 2) qualitative data gathered through initial surveys and verbal interviews, including two pilot studies. Stakeholder perspectives obtained through interviews are interpreted through the following theoretical frameworks: 1) the business perspective aiming at the success of all stakeholders; 2) the marketing perspective aiming at improving stakeholder satisfaction as a means of enhancing the operational efficiency of organizations; and 3) the educational perspective aiming to create effective teaching and engaging learning environments for the success of today's young creative talents. The researcher contends that the findings strongly suggest curricular and pedagogy change in accordance with societal changes and demands of the stakeholders—current student generation, creative industry, and academia—while at the same time informing the significant value of college education, BFA education, and textile education in the 21st century.