1,720,968 research outputs found
High-Performance PEEC Analysis of Electromagnetic Scatterers
No full textLow-rank approximation techniques are useful approaches to reduce the computational effort required by integral equations methods. Here, two different libraries based on hierarchical-matrices and hierarchically semi-separable matrices are applied to the partial element equivalent circuit method for the study of high-frequency electromagnetic problems. The academic case of a dielectric sphere and the study of a complex device used in thermonuclear fusion science are considered in order to compare the performances of the two libraries
A 3-D PEEC Formulation Based on the Cell Method for Full-Wave Analyses With Conductive, Dielectric, and Magnetic Media
No full textA novel partial element equivalent circuit (PEEC) formulation for solving full-Maxwell’s equations, with piecewise homogeneous
and linear conductive, dielectric, and magnetic media, is presented. It is based on the cell method which by using integral variables
as problem unknowns is naturally suited for developing circuit-like approaches such as PEEC. Volume meshing allows complex
3-D geometries, with electric and magnetic materials, to be discretized. Electromagnetic couplings in the air domain are modeled
by integral equations
Optimization of RFX-mod2 gap configuration by estimating the magnetic error fields due to the passive structure currents
No full textA major refurbishment of the toroidal complex of the RFX-mod device is in progress and will include the removal of the Inconel vacuum vessel and a modification of the stainless steel supporting structure to be made vacuum tight. The plasma facing graphite tiles will be mounted onto the inner surface of the copper shell so as to increase the plasma proximity factor. New operation regimes are expected to provide a significant reduction of the amplitude of RFP tearing modes with magnetic chaos mitigation and confinement improvement
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Modellizzazione e riduzione degli errori di campo magnetico in RFX-mod upgrade
Full text linkLe strutture metalliche conduttrici che inglobano il plasma in RFX sono caratterizzate da tagli (gap) necessari per la penetrazione dei campi magnetici esterni, ma al tempo stesso sono causa di errori di campo. In questa tesi è presentato uno studio elettromagnetico di questi errori ed un possibile sistema di correzione, costituito da un set di 12 bobine posizionate in corrispondenza dei gapope
Modellizzazione e riduzione degli errori di campo magnetico in RFX-mod upgrade
Full text linkLe strutture metalliche conduttrici che inglobano il plasma in RFX sono caratterizzate da tagli (gap) necessari per la penetrazione dei campi magnetici esterni, ma al tempo stesso sono causa di errori di campo. In questa tesi è presentato uno studio elettromagnetico di questi errori ed un possibile sistema di correzione, costituito da un set di 12 bobine posizionate in corrispondenza dei ga
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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