1,720,989 research outputs found
A New Low Cost Coupling System for Power Line Communication on Medium Voltage Smart Grids
No full textThis paper proposes and verifies the performance of an innovative and low cost coupling system for power line communication (PLC) on medium voltage (MV) smart grids. The coupling system makes use of the capacitive divider of the voltage detecting systems (VDSs) to inject and receive the PLC signal. VDS are usually already installed in the MV switchboards of the major electrical manufacturer all over the world according to IEC 61243-5. VDS are used to detect the presence of the mains voltage to guarantee personnel safety. An interface circuit has been developed to be connected between the PLC transceiver and the VDS socket. In this way, the PLC signal can be coupled to the MV network without installing a dedicated MV coupler, thus avoiding the related costs of the coupler, the installation, and the temporary service interruption. The innovative device is able to couple digitally modulated narrowband PLC signals with modulation rate up to 19.2 kbit/s. In this paper, first a description of the proposed solution is reported. Second, its communication performance has been tested in laboratory. Finally, different tests have been carried out in two MV smart grid real installations under normal operation, i.e., in the presence of the mains voltage
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
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
DEVELOPMENT AND CHARACTERIZATION OF A VIRTUAL TOOL FOR LOAD FLOW ANALYSIS IN MICROGRIDS
No full textDistribution system operators (DSOs) of micro-grids, as those of small islands, need simple and versatile tools for power system monitoring and management purposes, in order to carry out analysis, verify the safety management of the power grid and to redesign it in case it doesn’t satisfy the grid constraints. These tools have to be based on proper communication and measurement infrastructures, which should be feasible for DSOs, in terms of low cost, flexibility and expandability features, in order to allow their development starting from the existing instrumentation and equipment typically employed in such networks. In this framework, this paper presents a virtual instrument for load flow analysis in energy distribution systems of micro-grids. The solution is based on a low cost measurement architecture, which has been implemented on-field, on the real distribution network of the Island of Favignana (Italy, Mediterranean Sea). To fully investigate the suitability of the proposed solution, the developed tool has been characterized by means of an uncertainty analysis, considering both real measurement data and network parameters uncertainty propagation on the power flow estimations. Furthermore, in [1] off-line simulations based on real measurement data have been carried out to study the impact of distributed generation. Thus, the validated tool is useful not only for on-line analysis of power flows, but also for planning purposes, as it allows investigating the influence of distributed generator power injection in different scenarios, starting from real measurement data. This research has been funded by PO FESR Sicilia 2014-2020, Action 1.1.5, Project n. 08000PA90246, Title “Smart grids per le isole minori” (I-Sole), CUP: G99J18000540007
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
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