1,720,962 research outputs found
Interaction between Economic and Computational Problems arising in Internet: a Preliminary Investigation
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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
Three-dimensional cross-hole Electrical Resistivity Tomography to control the injection of expanding resins: a case history in Venice (Italy)
No full textInjection of expanding polyurethane resins has recently become a widespread technique to improve the geotechnical characteristics of shallow soils for consolidation purposes. Although resins injection practice has revealed to be a satisfactory solution for the above mentioned problems, a continuous monitoring of the process is needed to achieve optimal results. In order to control the injection of expanding resins a field procedure has been developed, based on the use of three dimensional Electrical Resistivity Tomography.
The choice of electrical resistivity, as a parameter for designing, monitoring and validating the homogenisation task, is based on the basic assumption that such a property is the most sensitive to water content. During the injection stage, repeated ERT acquisitions allow to control the process and to modify the injection program/parameters, whenever necessary.
In this paper the procedure and its results are illustrated, through a case history in Venice (Italy), where environmental problems, due to the presence of salt water bearing soils, had to be taken into account.
Therefore a specific, careful analysis of arrays of electrodes and selection of the main parameters affecting ERT resolution had to be performed in advance
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
Metodo per la valutazione di proprieta' meccaniche di un terreno
No full textLa presente invenzione si riferisce ad un metodo per la valutazione di proprietà meccaniche di un terreno edilizio tramite la propagazione e la ricezione di onde elastiche. Come è noto, le onde sismiche si propagano nei terreni secondo varie tipologie. Nei fenomeni tellurici, la propagazione delle onde sismiche è spesso responsabile dei maggiori danni alle strutture edificate e la misura della velocità di propagazione delle onde consente altresì di classificare i terreni di fondazione secondo le principali norme tecniche internazionali, di ottenere informazioni sulla loro stratigrafia e così via. In particolare, la velocità delle onde elastiche trova ampie correlazioni con le rigidità dei materiali che formano i terreni.
La valutazione delle caratteristiche di un terreno, in particolare in termini di rigidità, trova impiego nelle operazioni di protezione di un edificio dai fenomeni sismici e nell'eventuale consolidamento dello stesso. È quindi evidente che una caratterizzazione il più completa possibile delle proprietà meccaniche di un terreno, non solo in termini di modulo elastico ma anche di altre proprietà, quali la velocità delle onde di volume (Vp), velocità delle onde di taglio (Vs), costanti di Lamè (λ e μ), rapporto di Poisson (ν), Fattore di qualità (Q), Attenuazione e densità (ρ), si rivela particolarmente utile nel campo della prevenzione sismica. La richiedente ha compreso che per una efficiente deduzione delle caratteristiche meccaniche attraverso lo studio della propagazione di onde sismiche è necessario utilizzare modelli realistici di sottosuolo eventualmente in grado di incorporare la presenza di anomalie di velocità note quali ad esempio non limitativo: la presenza di topografia irregolare, fondazioni di edifici, vasche biologiche, ecc.
Obiettivo del presente trovato è quindi quello di mettere a disposizione un metodo per la valutazione di proprietà meccaniche di un terreno edilizio strutturalmente e funzionalmente concepito per ovviare agli inconvenienti lamentati dalle tecniche che ad oggi rappresentano l'arte nota in merito ai metodi sismici non invasivi, potendo indagare con affidabile precisione anche i volumi di terreno sottostanti il costruito in modo meno limitato e più affidabile
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