1,720,981 research outputs found
Crescita via CVD di nanofili di silicio su substrati di acciaio funzionalizzati con oro, argento e rame
Full text linkIn questo rapporto si presenta uno studio sulla sintesi e caratterizzazione di materiali nanostrutturati nella forma di strutture nanometriche filiformi di silicio da utilizzare come materiali anodici in batterie litio-ione. In particolare si presentano dei campioni ottenuti mediante la tecnica di Chemical Vapor Deposition (CVD) utilizzando come metallo catalizzatore, oro, argento e rame.This report shows a study on the synthesis and characterization of nanostructured materials in the form of silicon nanowires for applications in lithium-ion batteries. In particular, the growth by Chemical Vapor Deposition (CVD) of Si nanowires on stainless steel substrates by using gold, silver and copper as the catalyst will be reported
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
Crescita di nanofili di silicio su carbon paper mediante CVD catalizzata da nanoparticelle di rame
Full text linkNell’ambito dello studio di nuovi materiali anodici per migliorare le prestazioni delle batterie Li-ione, abbiamo cresciuto nanofili di silicio su substrato di carbon paper mediante Chemical Vapour Deposition (CVD), utilizzando come metallo catalizzatore nanoparticelle di rame. In questo rapporto verrà messo in evidenza come l’ottimizzazione dei parametri di crescita sia un passaggio cruciale per crescere nanofili con la morfologia idonea per il loro utilizzo come materiale anodico nelle batterie. In particolare, vengono mostrati i risultati ottenuti sulla morfologia e struttura dei nanofili variando opportunatamente parametri di flusso, pressione del gas precursore e durata della crescita. I campioni ottenuti sono stati analizzati mediante Scanning Electron Microscopy (SEM), Trasmission Electron Microscopy (TEM) e X-Ray Photoelectron Spectroscopy (XPS) ottenendo importanti informazioni morfologiche sulla dimensione dei nanofili e sulla loro struttura. I nanofili così ottenuti verranno poi caratterizzati elettrochimicamente per il loro utilizzo come anodi..In the research field of new anodic materials for improving the Li-ion batteries performance, we have grown silicon nanowires on carbon paper substrate by Cu-catalysed Chemical Vapour Deposition (CVD) method. In this report, great effort is aimed at the optimization of the growth parameters to obtain nanowires with a morphology suitable for their application as anodes in lithium ion batteries. In particular, recent results on the morphology and structure of Si nanowires obtained changing the flux and pressure of the precursor gas and the growth time are shown. The samples are analysed by Scanning Electron Microscopy (SEM), Trasmission Electron Microscopy (TEM) and X-Ray Photoelectron Spectroscopy (XPS) in order to obtain fundamental information on the dimension and structure of nanowires. Then the samples will be electrochemically characterized for their use as anodes
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
Fiber Bragg Gratings embedded inside 3D-printed Patches - sensor design and mechanical characterization
No full textThe application of optical fibers with fiber Bragg gratings (FBG) in the civil, biomedical and robotics fields presents several challenges related to the positioning and gluing of the sensor to the surface to be monitored. For this reason, the development of 3D-printed patches that embed optical fibers has become relevant in recent years. The studies existing in the literature focus on some specific process parameters, like the infill density and the choice of the material of the patch. However, a systematic analysis regarding the interaction between the material of the patch material and the embedded fiber coating to secure adhesion and strain transfer is still missing. This preliminary study aims at assessing the performances of 3D-printed patches embedding optical fibers in different combinations of filament materials and coatings of the fiber. Two sensors per combination of filament material (ABS, PLA) and coating of the fiber (acrylate, polyimide) are fabricated and mechanically tested. The results indicate that the fabrication process is more reliable when using polyimide-coated fibers, and the measurements of the resulting sensors are more repeatable
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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