1,720,956 research outputs found
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
Structural Health Monitoring of smart composites: experimental studies and modelling
No full textembargoed_20260903Il lavoro di tesi consiste nel monitoraggio strutturale con metodi elettrici di laminati cross-ply in fibra di vetro modificati con nanotubi di carbonio (CNTs). L’ obiettivo è quello di valutare la possibilità di monitorare la presenza di cricche trasversali ed il calo di rigidezza associato tramite misure di resistenza elettrica. Sono stati condotti test statici e ciclici su provini strumentati con estensometro ed opportuni elettrodi per le misure elettriche. I risultati sono stati analizzati per valutare la sensibilità della risposta elettrica alla presenza di danno. L’applicazione di modelli analitici e numerici, nonché l’analisi microscopica della morfologia dei campioni e del danneggiamento, hanno permesso di comprendere ed interpretare i risultati ottenuti. Questi ultimi, infatti, hanno mostrato una sensibilità del metodo alla presenza di cricche, anche se inferiore alle aspettative, a causa di una dispersione non ottimale dei nanotubi nel laminato
Development of a Surface Characterization Method for Analyzing the Performance of Abrasive Wheels Used in Industrial Processes for Finishing and Polishing Natural and Synthetic Stones
No full textembargoed_20280331Lo scopo di questa tesi è sviluppare un metodo per la caratterizzazione completa e
dettagliata di una superficie in pietra naturale o sintetica lavorata con mole abrasive a
matrice resinoide.
Il progetto nasce dal crescente interesse, in ambito industriale e commerciale, per la
qualità delle superfici lucidate, in termini di finitura e nitidezza del riflesso ottenuto,
soprattutto nei settori dei materiali da costruzione e dell’arredamento.
Le prestazioni sempre più avanzate degli utensili per la lavorazione delle superfici, unite
all’innovazione nella produzione della pietra ingegneristica, hanno reso necessaria
l’elaborazione di un metodo per misurare, quantificare e valutare i risultati degli abrasivi,
correlando questi dati sia alla percezione estetica della superficie sia alle sue funzionalità.
In questo progetto sono state esplorate diverse tecniche per la caratterizzazione
superficiale. Da un lato, si è approfondita la conoscenza e il potenziale di metodi
consolidati, come la glossmetria e la misurazione della rugosità; dall’altro, sono state
introdotte tecniche più innovative, capaci di fornire una topografia completa e dettagliata
della superficie in due e tre dimensioni, come la microscopia confocale con profilometro
ottico.
I risultati ottenuti hanno permesso di affinare i criteri di valutazione delle prestazioni di
un utensile abrasivo e di migliorare la comprensione del legame tra finitura, tessitura,
integrità, funzionalità ed estetica di una superficie.The aim of this thesis is to develop a method for the complete and detailed
characterization of a natural or synthetic stone surface processed with resin-bonded
abrasive wheels.
The project stems from the growing industrial and commercial interest in the quality of
polished surfaces, in terms of finish and sharpness of reflection, particularly in the
construction materials and furniture sectors.
The increasingly advanced performance of surface processing tools, combined with
innovation in engineered stone production, has made it necessary to develop a method for
measuring, quantifying, and evaluating the results of abrasives, correlating these data both
with the aesthetic perception of the surface and with its functionality.
In this project, various techniques for surface characterization have been explored. On the
one hand, the knowledge and potential of well-established methods, such as gloss
measurement and roughness analysis, have been further investigated; on the other hand,
more innovative techniques have been introduced, capable of providing a complete and
detailed topography of the surface in two and three dimensions, such as confocal
microscopy with an optical profilometer.
The results obtained have refined the evaluation criteria for the performance of an
abrasive tool and enhanced the understanding of the relationship between surface finish,
texture, integrity, functionality, and aesthetics
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
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