1,720,959 research outputs found
Materiali per tessuti intelligenti. Dallo stato dell'arte alle fibre di Carbonio per il progetto TEX-STYLE
Full text linkNell’ambito del progetto TEX-STYLE– Nuovi tessuti intelligenti e sostenibili multi-settoriali per design creativo e stile made-in-Italy, finanziato nell’ambito dei Programmi Operativi Nazionali (PON 2014- 2020) FESR (Fondo Europeo di Sviluppo Regionale), è stato condotto uno studio focalizzato a delineare lo stato dell’arte esistente nel campo dei materiali impiegati come tessuti intelligenti, ovvero tessuti elettronici, e successivamente finalizzato alla selezione e definizione delle proprietà richieste a filati conduttivi da impiegare per la realizzazione di tessuti e rivestimenti intelligenti multifunzionali, integrati in prodotti innovativi che ampliano le opportunità di design creativo, massimizzando i concetti del Made in Italy. In particolare, i filati conduttivi selezionati sono state le fibre di carbonio proveniente da riciclo di materiali compositi a fine vita e/o da scarti di lavorazione, al fine di coniugare criteri di funzionalità dei materiali con il criterio di sostenibilità ambientale, promuovendo così l’impiego di materie prime seconde altrimenti destinati al confinamento in discarica. Il prodotto finale è un filato ibrido in cui la fibra di carbonio, in grado di assicurare proprietà di conduzione elettrica, affianca una fibra tradizionalmente impiegata nella realizzazione di tessuti (poliammide 6). Tale studio ha consentito di stabilire i target prestazionali da conseguire nel proseguo della sperimentazione in laboratorio, in termini di conducibilità elettrica dei filati ibridi, di densità lineare e di tenore della fibra nel filato/tessuto finale
Synthesis and characterization of SnO2 nanoparticles embedded in silica by ion implantation
No full textTin dioxide nanoparticles embedded in silica matrix were fabricated by ion implantation combined with thermal oxidation. Silica substrate was implanted with a 150 keV Sn+ ions beam with a fluence of 1.0 × 10 17 ions/cm2. The sample was annealed for 1 h in a conventional furnace at a temperature of 800 °C under flowing O2 gas. According to the structural characterization performed by X-ray diffraction and transmission electron microscopy techniques, metallic tetragonal tin nanoparticles with a volume average size of 12.8 nm were formed in the as-implanted sample. The annealing in oxidizing atmosphere promotes the total oxidation of the tin nanoparticles into tin dioxide nanoparticles with a preferential migration toward the surface of the matrix, where large and coalesced nanoparticles were observed, and a small diffusion toward the bulk, where smaller nanoparticles were found. © 2010 Elsevier B.V. All rights reserved
SnO2 nanoparticles embedded in silica by ion implantation followed by thermal oxidation
No full textNanoparticles of tin dioxide embedded in silica matrix were synthesized by ion implanting a Sn+ ion beam in a silica slide and by annealing in oxidizing atmosphere at 800 °C. A detailed structural and optical characterization was performed by using glancing incidence x-ray diffraction, transmission electron microscopy, optical absorption, and photoluminescence spectroscopies. Metallic tetragonal Β -tin crystalline nanoparticles were formed in the as-implanted sample. The annealing in oxidizing atmosphere promotes the total oxidation of the tin nanoparticles with a preferential migration of the nanoparticles toward the surface of the matrix. A broad blue-violet emission band peaked at 388 nm was observed in the photoluminescence spectra of both the as-implanted and annealed samples, which was attributed to the Sn-related oxygen deficiency center defects and the SnO2 nanoparticles, respectively. © 2009 American Institute of Physics
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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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