2,008 research outputs found

    Main Line Fault Localization Methodology (MLFLM) in Smart Grid – The Underground Medium- and Low-Voltage Broadband over Power Lines Networks Case

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    This paper assesses the performance of the main line fault localization methodology (MLFLM) when its application is extended to underground medium- and low-voltage broadband over power lines (UN MV and UN LV BPL) networks, say UN distribution BPL networks.  This paper focuses on the localization of main distribution line faults across UV MV and UN LV BPL networks. By extending the MLFLM procedure, which has successfully been applied to overhead medium-voltage (OV MV) BPL networks, the performance assessment of MLFLM is investigated with respect to the nature of the main distribution line faults, the intensity of the measurement differences and the fault location across the main distribution lines of the underground distribution power grid (either MV or LV grid).Citation: Lazaropoulos, A. G. (2017). Main Line Fault Localization Methodology (MLFLM) in Smart Grid – The Underground Medium- and Low-Voltage Broadband over Power Lines Networks Case. Trends in Renewable Energy, 4, 15-42. DOI: 10.17737/tre.2018.4.1.004

    Application of quasiparticle forces in quantum technologies

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    The performance of many superconducting devices is diminished by long-lived Bogoliubov quasiparticle excitations present in the superconducting part. In normal-metal–insulator– superconductor structured micro-refrigerators, for example, the tunneling of quasiparticles into the normal metal and the accompanying backflow of heat just extracted from it, reduces the cooling efficiency. In superconducting qubits incoherent quasiparticle tunneling through Josephson junctions leads to qubit decoherence and relaxation. While the associated rates are small compared to those of currently more serious noise sources, quasiparticle tunneling is expected to be relevant for fulfilling the high requirements given by current quantum com-putation tasks based on fault tolerant quantum computing. Normal-metal quasiparticle traps among other established techniques are commonly used in order to redistribute the quasi-particles inside the superconducting part and reduce their density in regions which are more important for the device performance. In this thesis we quantitatively investigate on the trapping performance of such normal-metal quasiparticle traps and particularly the role taken by the superconducting proximity effect therein. The quasiclassical Green’s function approach based on the non-equilibrium Keldysh technique serves as theoretical tool. As central physical quantities in the stationary non-equilibrium state the superconducting order parameter, local density of quasiparticle states and the quasiparticle density are put into context with the proximity effect. Two competing characteristics opposingly affecting the trapping performance are revealed, which points out the existence of an ideal trap position with optimal trapping performance. Furthermore, the conversion between dissipative normal current and supercurrent mediated by Andreev reflection and the resulting reduction of the quasiparticle density is studied. A further part of this thesis is about the emulation of quantum field theory in curved spacetime involving spontaneous particle creation due to the conversion of virtual particles into real, detectable ones. We propose an experimental setup, where the dynamics of surface acoustic waves and phonons, respectively, on a piezoelectric semiconductor mimics the propagation of a massless scalar quantum field on a curved spacetime with an effective metric resembling that of a black hole and an expanding universe to some extent, including an acoustic event horizon for surface acoustic waves. An appropriate detection scheme indicating particle creation in form of phonons employs electron loaded dynamic quantum dots and a Stern-Gerlach gate for their readout. A non-thermal steady state for the electrons is predicted, which is ascribed to particle creation.Die Performance vieler auf Supraleitung basierender Quantentechnologien wird durch die Präsenz von langlebigen Bogoliubov-Quasiteilchen im supraleitenden Bauteil beeinträchtigt. Die Kühlleistung von elektronischen Mikro-Kühlern beispielsweise, die aus normal- und supraleitenden Metallen bestehende Tunnelkontakte verwenden, wird durch in das Normal-metall tunnelnde Quasiteilchen und dem damit einhergehendem Wärmefluss, welche dem Normalmetall zuvor entzogen wurden, reduziert. In supraleitenden Qubits führt inkohärentes Tunneln von Quasiteilchen durch Josephson-Kontakte zu Dekohärenz und Relaxation des Qubits. Zwar sind die damit verbundenen Raten im Vergleich zu denen anderer Fehlerquellen laut aktuellem Stand kleiner, man geht jedoch davon aus, dass das Tunneln von Quasiteilchen relevant ist, um die hohen Anforderungen, die aktuelle Anwendungen von fehlertoleranten Quantencomputern erfordern, zu erfüllen. Der Einsatz von Normalmetall-Quasiteilchenfallen und anderer experimenteller Techniken hat sich etabliert, um Quasiteilchen im supraleitenden Bauteil umzuverteilen und deren Dichte in für die Performance ausschlaggebenden Regionen zu reduzieren. In dieser Dissertation untersuchen wir quantitativ die Einfangperformance solcher Normalmetall-Quasiteilchenfallen und speziell die Rolle, die der supraleitende Proximity-Effekt dabei spielt. Als theoretisches Werkzeug dienen dabei quasiklassische Greensfunktionen, die auf der Keldysh-Technik für Nichtgleichgewichtssituationen basieren. Als zentrale physikalische Größen des stationären Nichtgleichgewichtszustandes werden der supraleitende Ordnungsparameter, die lokale Zustandsdichte der Quasiteilchen und deren Dichte mit dem Proximity-Effekt in Verbindung gebracht. Dabei werden zwei sich auf die Fallenwirkung gegensätzlich auswirkende Eigenschaften deutlich, welche die Existenz einer idealen Fallenpositionierung mit optimaler Einfangperformance aufzeigen. Zusätzlich wird die durch Andreev-Reflektion veraursachte Umwandlung zwischen dissipativem Normalstrom und Suprastrom und die damit verbundene Reduktion der Quasiteilchendichte studiert. Ein weiterer Teil dieser Dissertation behandelt die Emulation von Quantenfeldtheorie in gekrümmter Raumzeit mit spontaner Teilchenproduktion aufgrund der Umwandlung von virtuellen in reale, detektierbare Teilchen. Wir schlagen ein Experiment vor, in dem die Ausbreitung von akustischen Oberflächenwellen beziehungsweise Phononen auf einem piezoelektrischen Halbleiter die Propagation eines masselosen skalaren Quantenfeldes in einer gekrümmten Raumzeit mit einer effektiven Metrik imitiert. Die effektive Metrik weist dabei Ähnlichkeiten zu der eines Schwarzen Loches und eines sich ausdehnendem Universums auf, einschließlich eines akustischen Horizonts für akustische Oberflächenwellen. Ein geeignetes Detektionsverfahren, welches auf Teilchenproduktion in Form von Phononen hindeutet, verwendet in dynamischen Quantenpunkten gefangene Elektronen und ein Stern-Gerlach-Gatter für deren Messung. Wir sagen einen nicht-thermischen Gleichgewichtszustand der Elektronen vorher, der der Teilchenproduktion zugeschrieben wird

    RF and Microwave Measurements

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    open1noBasic theory and techniques are concentrated mostly in the first four chapters, where definitions, formulas and references are collected aiming at giving a thorough overview of the most relevant topics: circuit theory, material properties, transmission lines, signal analysis and spectral analysis, including random processes, probability and statistics. The central chapters 5, 6 and 7 deals with three important elements of setups and experiments: cables, printed circuit boards and connectors. The influence on the overall measurement, their modeling and characterization are discussed, keeping an eye on applicable standards. The last four chapters cover advanced aspects of scattering parameters, differential lines and mixed modes, and the use and performance of spectrum analyzer and vector network analyzer.openA. MariscottiMariscotti, A

    State of the Art: A Sampling of Twenty-First-Century American Baroque Flute Pedagogy

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    During the Baroque flute revival in 1970s Europe, American modern flute instructors who were interested in studying Baroque flute traveled to Europe to work with professional instructors. They then transmitted that knowledge to their students upon returning to America, furthering the modern study of Baroque flute in America. Now, thanks to their efforts and those of academic institutions and professional organizations such as the National Flute Association, there are many opportunities in America to hear performances by dynamic Baroque flutists, to perform and compete on Baroque flute, and to learn from respected Baroque flute instructors. There are also numerous texts and methods books on Baroque flute that give single-author perspectives on learning the instrument. There are, however, few comparisons of modern pedagogical approaches to teaching Baroque flute. Thus, through a detailed, topic-by-topic summary and comparison of eight modern American Baroque flute educators’ backgrounds and pedagogical methodologies (gathered through personal interviews and observations), this document is intended to capture a snapshot of Baroque flute pedagogy in twenty-first century America, identifying common experiences, practices, and philosophies and significant differences. It is hoped that this information can serve as a resource for those interested in researching or learning to play the Baroque flute, especially those without access to an instructor or who seek to compare pedagogical approaches. It is also hoped that this study further contributes to the increasing interest in modern Baroque flute study. Advisor: John R. Baile

    Exiles on Main Street: A Pedagogy of Popular Music Through Technology and Aesthetic Education

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    This dissertation investigates the application of instructional technology within the specific context of popular music education. Synthesizing the work of Mishra & Koehler (2006) and Bauer (2014), this dissertation operationalizes a broader, more contemporary definition of instructional technology that goes beyond the traditional conception of mere instructional tool towards one that is more protean, unstable, and opaque. Research questions about technology’s impact on music education are central to this curriculum study and evolve into considerations on how the relationship of popular music and instructional technology shape a pedagogy for popular music education. Making use of principles rooted in aesthetic education, critical pedagogy, and TPACK, the curriculum created fulfills the requirements of an undergraduate program in music education mapped onto the National Association of Schools of Music standards. Presented along with a standards map are course overviews, syllabi, and lesson plans that specifically make use of the theoretical backgrounds discussed

    Teaching Practicum - WRHS Spring 2008

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    This teaching practicum was completed at Wachusett Regional High School in Holden, MA in the Spring of 2008 as part of the initial teaching license program offered at Worcester Polytechnic Institute. Included in this project were nearly 160 hours of teaching freshman physics subject matter in the classroom and 98 hours of observation time in a variety of science classrooms. As a student teacher assuming the complete role of being a high school teacher, all materials used were compiled and lesson plans developed from available resources. Through this experience the role of the teacher became understood and the value of present teachers known

    Proceedings of the 25th International Seminar of the ISME Commission on Research. Federal University of ParaĂ­ba, JoĂŁo Pessoa, Brazil

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    This book includes twenty-three contributions developed form papers presented at the 2014 Research Commission Seminar of the International Society for Music Education (ISME). This was the 25th biennial ISME Research Commission Seminar, making it the most established research gathering of its type in the world. Over three hundred and seventy pages of peer-reviewed contributions are penned by scholars from the five continents working in the field’s state-of-the-art. Embracing diverse methodologies authors focus on topics including early childhood, inclusion, creativity, performance, perception, instrumental teaching, teacher education, primary, post-primary and informal education. Founded in 1954, affiliated to UNESCO and present in over eighty countries, ISME is the premiere international organisation for music education

    Proceedings of the 25th International Seminar of the ISME Commission on Research. Federal University of ParaĂ­ba, JoĂŁo Pessoa, Brazil

    Get PDF
    This book includes twenty-three contributions developed form papers presented at the 2014 Research Commission Seminar of the International Society for Music Education (ISME). This was the 25th biennial ISME Research Commission Seminar, making it the most established research gathering of its type in the world. Over three hundred and seventy pages of peer-reviewed contributions are penned by scholars from the five continents working in the field’s state-of-the-art. Embracing diverse methodologies authors focus on topics including early childhood, inclusion, creativity, performance, perception, instrumental teaching, teacher education, primary, post-primary and informal education. Founded in 1954, affiliated to UNESCO and present in over eighty countries, ISME is the premiere international organisation for music education

    Addressing progressive educational reforms: Fusing acquisition approaches and participation in Chinese entrepreneurship education

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    Entrepreneurship education and pedagogic reforms advocating the increased use of progressive educational methods have been promoted by the Chinese government. In practice, this has led to a fusion of the more traditional teaching approach and more progressive approaches. This has led to calls for entrepreneurship education to be contextualized within the Chinese context, against the backdrop of the progressive pedagogic reforms. This paper addresses this by exploring how Chinese educators are responding to directives encouraging progressive pedagogic entrepreneurship education, by applying the lens of Sfard's knowledge acquisition and participation-orientation learning metaphors. Interviews were conducted with fifteen educators and analysis of their narratives of practice was undertaken to identify knowledge acquisition and participation-orientation metaphors to elicit the approaches adopted in the classroom. The results indicate that both acquisition and participation approaches are adopted by educators, but in a way that reflects the traditional and cultural heritage that values knowledge. Educators still relied heavily on the transmission-acquisition metaphor, however the encouragement to introduce more progressive practices could be observed in two ways, the constructivist acquisition metaphor, and the participation metaphor. The former appeared more developed and the latter less so, although both are desirable in the light of the education reforms

    Where practice meets philosophy: feminist pedagogy in the women’s choral rehearsal

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    This dissertation seeks to define feminist pedagogy, explore ways in which its values can be incorporated into women's choral rehearsal methodology, and illustrate its impact on female singers musically and personally. In order to provide a framework for feminist pedagogy, the review of literature includes an overview of current choral philosophies and pedagogies. By reviewing five choral methods textbooks commonly taught at higher education institutions, the values of current choral methodology are deduced and considered traditional. Literature about pedagogy for women's choirs and literature that expresses the need for the inclusion of feminine attributes in choral music and music education reveal that traditional methods do not meet the philosophies, needs and/or desires of some women singers and some women's choir conductors. A summary of the origins and values of feminist pedagogy, examples of its implementation in classroom settings, and its influence on the field of music give possible alternatives and/or supplementation to traditional choral pedagogy. Because feminist pedagogy has scarcely been researched in performance ensemble settings, this dissertation includes a qualitative research case study that explores the incorporation of two of the values of feminist pedagogy in the women's choral rehearsal--collaboration and the inclusion of affective learning (i.e., emotion). The fieldwork for the case study consists of rehearsal observations of a collegiate women's choir conductor who aligns herself with the values of feminist pedagogy; an interview with the conductor; and nine individual interviews with female singers ranging in age (undergraduate and graduate) and experience (non-music majors and music majors). Two of the observed methods that align with feminist pedagogy were analyzed--initiating discussion relating to interpretation and meaning of the music by inviting the thoughts and opinions of singers and asking thought-provoking questions to help students make musical decisions. Through these collaborative methods, students experience increased mental engagement; ownership with the music-making process; confidence in making musical decisions; feeling valued; confidence to be honest and speak up/out; and increased understanding of the music, of others, and of their role as a team player. Imagery, as well as collaborative approaches, encouraged an affective/emotional connection with the music. Through an affective/emotional connection with the music, singers experience ease in singing; increased expressivity; enhanced visual and visceral experiences during performance; heightened feelings of centeredness, wholeness and empowerment; opportunities for self-discovery, emotional release, and emotional escape; a stronger sense of purpose; expanded world-views; and increased sympathy for and understanding of others. The results of the case study reveal that methods incorporating the values of feminist pedagogy meet the philosophies, needs and/or desires of some female singers and some women's choir conductors. It is proposed that a combination of traditional methods and feminist pedagogy could be beneficial for female singers musically and personally
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