1,720,963 research outputs found
Infrared radiation effects in TiO2 nanostructured films
No full textWe present results of the influence of infrared radiation on metal–TiO2–metal junctions where the metal electrodes are composed of conducting SnO–SnO2 on glass substrates. An amount of 10–30 micron oxide films are obtained by deposition of TiO2 from a colloidal suspension followed by heating sinterization of grains. The morphology of the films have been studied by AFM analysis and result in an array of weakly separated grains of average diameter 30nm. In the dark, the devices show open-circuit voltages of few millivolt, with slight increase under solar light illumination. The voltages exhibit strong sensitivity, oscillatory behaviour and polarity reversibility due to external changes of the radiation. Such a photovoltaic effect can be explained either as a mesoscopic voltage arising from the nanograins under thermal radiation or as resonances due to pair tunnelling between the nanograins where high Tc locally develops
Superconductivity of TiO2 grains by plasmon resonances
No full textThe understanding of phonon-induced charge transport in nanostructured TiO2 is crucial for new generation solar cells, photocatatytic and H2 producing devices. We present results of phonon modes in rutile derived as surface plasmon resonances in the crystalline planes. We find a compound state of two phonon modes centered at 24THz in the bulk, which can exhibit enhanced polaronic state in the nanostructured system. We discuss the possible appearance of high Tc superconductivit
Casi studio
No full textRaccolta di schede riferite ad una selezione di edifici per l’istruzione, realizzati in ambito nazionale ed internazionale. L’obiettivo della rassegna non è quello di restituire una panoramica esaustiva della produzione di edifici scolastici sostenibili, ma di fornire spunti ed occasioni di confronto
ai committenti e ai progettisti interessati al miglioramento della qualità delle strutture scolastiche e della vita sociale delle persone che li occupano
Retrofitting energetico e bilancio costi/benefici
No full textAl fine di riqualificare l'edificio Virgolone, vengono individuati una serie di scenari di intervento che permettono l'innalzamento dei livelli prestazionali e il contenimento delle spese energetiche di gestione dell'edificio. Le strategie di intervento ipotizzate sull'involucro si differenziano per livelli di prestazione progressivamente più elevati
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
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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