1,721,003 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
Feasibility of IEC 61000-4-7 Class I Gapless Implementation of Harmonics Measurement on Low-Cost Microcontroller Device
No full textThis paper presents the implementation of gapless harmonic analysis on a commercial microcontroller device, according to IEC 61000-4-30 Class A and IEC 61000-4-7 Class I requirements. The final aim is to investigate the feasibility of accurate power quality (PQ) measurements with low-cost metering platforms, to enable the capillary diffusion of PQ monitoring for smart grids applications, including distributed generation, loads, electric vehicles and so on. Signal sampling and processing have been implemented on a commercial board used as case study. Experimental tests have been carried out to verify the feasibility of gapless harmonic analysis according to Standards requirements, in terms of both measurement times and accuracy
On-field demonstration of distributed generation and storage systems monitoring and control in small Islands power systems
No full textThis work summarizes the final results of the I-SOLE project (“Smart grids per le Isole Minori”, co-financed by European Union under the framework of PO FESR Sicilia 2014-2020, Action 1.1.5, https://www.progettoisole.com/), which has been aimed at developing innovative solutions and devices for distributed generation and storage systems integration in small Islands power grids. For such networks, the increase of energy production from renewable sources is a strategic theme for the sustainability and energy independence goals; at the same time, it entails specific problems concerning the robustness of the distribution grids against instability, power flows inversions and other power quality (PQ) problems.
The I-SOLE project partnership has involved the University of Palermo, two research institutes of the National Research Council (Institute of Marine Engineering and Advanced Energy Technology Institute) and five industrial partners (Layer Electronics Srl – project leader; STMicroelectronics; SEA – Società Elettrica di Favignana SpA; SOPES Srl – Ustica desalination plant management company; Elettromeccanica Mangano Sas). The on-field demonstrators on the Islands of Favignana, Ustica and Lipari have provided the opportunity to test different architectures of distributed measurement systems and new devices and equipment prototypes, allowing the industrial partners to develop new products for smart grids applications
EXPERIMENTAL CHARACTERIZATION OF SERIES ARC FAULTS IN DC PV SYSTEMS
No full textThe experimental study herein presented has been aimed at investigating the suitability of using low frequency harmonic current analysis for arc detection purposes, even considering real case noisy situations [1]. An experimental characterization of series arcs has been carried out, with both laboratory and on-field tests, reproducing some arcing conditions, in accordance with the UL 1699B Standard requirements [2]. A preliminary analysis of the arcing current has been made in the low frequency range, in order to highlight some relevant characteristics for the arc detection purpose, which can be easily measured without the need of sophisticated measurement instrumentatio
A Data Communication Redundant Solution Based on RF and PLC Systems for Smart Grid Applications
No full textClean energy challenge requires an integration of high level measurement and control devices for monitoring and automation of electrical networks, distributed generations and storage systems into the smart grid paradigms. Sensible data are exchanged among central control systems and remote devices, whose communication link reliability is of most importance. To this aim, this paper proposes to use a hybrid communication system based on power line communication (PLC) and radio frequency (RF), to perform redundancy of sensible data, thus preserving possible loss of important field measurements or commands. In this framework, the feasibility of a redundant solution is experimentally investigated using two hybrid PLC/RF electronics boards and developing a new firmware, which allows verifying that each frame is coherently transmitted and received by both means. First laboratory experimental tests were conducted to collect measures and to preliminary prove the robustness of the proposed architecture
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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