1,721,018 research outputs found
La prototipazione rapida nell’idroformatura di lamiere piane
No full textUno studio del processo d’idroformatura
di lamiere singole con una matrice realizzata
con RP, ovvero la sovrapposizione
di strati di lamiere di spessore opportuno
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
Wave energy converters technology database for a web-based platform for evaluating wave energy resource and productivity potential
No full textWave energy is gaining increasing attention in worldwide energy planning strategies as key enabling factor for reaching the ambitious carbon neutrality targets. Therefore, a seamless access to the energy resource is needed, as well as the productivity of various wave energy converters, to probe the potential of installing farms in a given location. This paper presents and uses the novel web-based MORE-EST Platform (Marine Offshore Renewable Energy – Energy Security Transition), which aggregates information for wave resource assessment, bathymetry and marine space use. This work includes the mathematical modelling of the underlying technology database: 1) an Oscillating Surge Wave Energy Converter, to discuss the importance of including directionality in productivity assessment; 2) a Heaving Point Absorber and its techno-economic optimisation, comparing various proxies for capital expenditures. Results demonstrate that: 1) neglecting directionality may lead to errors in the productivity estimation, up to 31% in a site with a narrow wave rose, and up to 46% in a site with a widespread wave rose; 2) different optimisation objectives lead to dramatically different devices
Comparison of the ERA5 Wave Forecasting Dataset against Buoy Record
Full text linkAppropriate design of marine structures, such as offshore facilities and harbours, requires a detailed estimation of synthetic wave parameters. Inaccuracies and unreliability of wave data have implications in many aspects of marine engineering, such as structural strength, cost, and design. In this paper, a critical analysis of the most common data acquisition methods is made, focusing on in-situ instrumentation and numerical models. Considering the Pantelleria island as case study, records of a proprietary wave buoy and the ERA5 dataset of ECMWF (European Centre for Medium-Range Weather Forecasts) have been compared. This paper first highlights the methods and challenges of offshore experimental campaigns for wave monitoring and eventually presents a critical and quantitative comparison of the two approaches (experimental versus numerical), highlighting their respective advantages and disadvantages
Variability of wecs’ performance according to the wave directional spreading variation
No full textThe exploitation of Renewable Energy Sources (RES) is critical to move forward and to aim for global sustainability. In this scenario, the development of devices able to take advantage of wave energy resources is continuously advancing. The basic methodology to acquire energy from waves is based on the identification of sites having high energy and the optimization of Wave Energy Converters (WECs), according to the sea states’ characteristics. The principal parameters which describe wave conditions are the significant wave height and the wave energy period, which allow estimating the respective average wave power, and the peak direction, which indicates the main incoming wave direction. However, these parameters give only limited information since the directional distribution of the different wave components is missing. In the wave spectrum analysis, the directional spread is a measure of the range of wave directions and states if wave components are coming from similar directions or various ones. Considering the spreading parameter is especially significant in directional WEC devices. The main scope of this paper is to highlight the relevance of directional analysis about wave and WEC device interaction. Therefore, considering the direction of every wave component, an accurate and detailed analysis can be conducted. Assuming Pendulum Wave Energy Converter (PeWEC) as a case study, the correlation between the performance and the omni- and uni-directional sea states is shown. Especially, the investigation results are focus on the influence that the variation of directional spreading value has on the PeWEC performing features
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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