1,721,016 research outputs found
STRUCTURE AND SUPERCONDUCTING PROPERTIES OF PURE AND VARIOUSLY DOPED BULK MgB2 OBTAINED BY UNIAXIAL AND ISOSTATIC HOT PRESSING
No full textInterdiffusion and compound formation in the cSi/PtSi/(TiW)/Al system
No full textScanning electron microscopy, microphobe measurements, Auger electron spectroscopy and X-ray diffraction were used to investigate interdiffusion phenomena occurring in the cSi/PtSi/(TiW)/Al system (where cSi denotes for crystalline silicon) widely used in silicon integrated circuits. The formation of intermetallic compounds begins with the diffusion of aluminum through the barrier layer of the Ti0.1W0.9 pseudoalloy and the consequent growth of the Al2Pt phase which causes the PtSi layer to decompose. At the same time Al12W forms at the Al(TiW) interface. As a result of the volume increase because of the formation of the Al2Pt, the TiW layer breaks, allowing the dissolution of silicon and the growth of WSi2 and TixW1−xSi2 compounds. A few monolayers of oxygen at the Al(TiW) interface substantially delay the interdiffusion process
STUDY OF THE SINTERING BEHAVIOUR OF MgB2 SUPERCONDUCTOR DURING HOT-PRESSING
No full textThe densification behaviour of MgB2 was studied when commercial powder was hot-pressed in the temperature
range 1070–1190 C. The mechanisms active during sintering were investigated by continuously recording the shrinkage
vs. time and elaborating the data on the basis of Kingery’s model for liquid phase sintering. XRD and SEM analysis on
final dense bodies were used to evaluate secondary phases formation during sintering and the effect of magnesium
sublimation. AC magnetic susceptibility measurements were also performed to correlate the microstructural and morphological modifications induced by hot-pressing and the superconducting properties
Large-Grained (111)-Oriented Cdte Thin-Films Grown By Quasi-Rheotaxy On Steel Substrates
No full text
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
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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